// OpenLayers 3. See http://openlayers.org/
// License: https://raw.githubusercontent.com/openlayers/ol3/master/LICENSE.md
// Version: v3.18.2
;(function (root, factory) {
  if (typeof exports === "object") {
    module.exports = factory();
  } else if (typeof define === "function" && define.amd) {
    define([], factory);
  } else {
    root.ol = factory();
  }
}(this, function () {
  var OPENLAYERS = {};
  var goog = this.goog = {};
this.CLOSURE_NO_DEPS = true;
// Copyright 2006 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/**
 * @fileoverview Bootstrap for the Google JS Library (Closure).
 *
 * In uncompiled mode base.js will write out Closure's deps file, unless the
 * global <code>CLOSURE_NO_DEPS</code> is set to true.  This allows projects to
 * include their own deps file(s) from different locations.
 *
 * @author arv@google.com (Erik Arvidsson)
 *
 * @provideGoog
 */


/**
 * @define {boolean} Overridden to true by the compiler when
 *     --process_closure_primitives is specified.
 */
var COMPILED = false;


/**
 * Base namespace for the Closure library.  Checks to see goog is already
 * defined in the current scope before assigning to prevent clobbering if
 * base.js is loaded more than once.
 *
 * @const
 */
var goog = goog || {};


/**
 * Reference to the global context.  In most cases this will be 'window'.
 */
goog.global = this;


/**
 * A hook for overriding the define values in uncompiled mode.
 *
 * In uncompiled mode, {@code CLOSURE_UNCOMPILED_DEFINES} may be defined before
 * loading base.js.  If a key is defined in {@code CLOSURE_UNCOMPILED_DEFINES},
 * {@code goog.define} will use the value instead of the default value.  This
 * allows flags to be overwritten without compilation (this is normally
 * accomplished with the compiler's "define" flag).
 *
 * Example:
 * <pre>
 *   var CLOSURE_UNCOMPILED_DEFINES = {'goog.DEBUG': false};
 * </pre>
 *
 * @type {Object<string, (string|number|boolean)>|undefined}
 */
goog.global.CLOSURE_UNCOMPILED_DEFINES;


/**
 * A hook for overriding the define values in uncompiled or compiled mode,
 * like CLOSURE_UNCOMPILED_DEFINES but effective in compiled code.  In
 * uncompiled code CLOSURE_UNCOMPILED_DEFINES takes precedence.
 *
 * Also unlike CLOSURE_UNCOMPILED_DEFINES the values must be number, boolean or
 * string literals or the compiler will emit an error.
 *
 * While any @define value may be set, only those set with goog.define will be
 * effective for uncompiled code.
 *
 * Example:
 * <pre>
 *   var CLOSURE_DEFINES = {'goog.DEBUG': false} ;
 * </pre>
 *
 * @type {Object<string, (string|number|boolean)>|undefined}
 */
goog.global.CLOSURE_DEFINES;


/**
 * Returns true if the specified value is not undefined.
 * WARNING: Do not use this to test if an object has a property. Use the in
 * operator instead.
 *
 * @param {?} val Variable to test.
 * @return {boolean} Whether variable is defined.
 */
goog.isDef = function(val) {
  // void 0 always evaluates to undefined and hence we do not need to depend on
  // the definition of the global variable named 'undefined'.
  return val !== void 0;
};


/**
 * Builds an object structure for the provided namespace path, ensuring that
 * names that already exist are not overwritten. For example:
 * "a.b.c" -> a = {};a.b={};a.b.c={};
 * Used by goog.provide and goog.exportSymbol.
 * @param {string} name name of the object that this file defines.
 * @param {*=} opt_object the object to expose at the end of the path.
 * @param {Object=} opt_objectToExportTo The object to add the path to; default
 *     is |goog.global|.
 * @private
 */
goog.exportPath_ = function(name, opt_object, opt_objectToExportTo) {
  var parts = name.split('.');
  var cur = opt_objectToExportTo || goog.global;

  // Internet Explorer exhibits strange behavior when throwing errors from
  // methods externed in this manner.  See the testExportSymbolExceptions in
  // base_test.html for an example.
  if (!(parts[0] in cur) && cur.execScript) {
    cur.execScript('var ' + parts[0]);
  }

  // Certain browsers cannot parse code in the form for((a in b); c;);
  // This pattern is produced by the JSCompiler when it collapses the
  // statement above into the conditional loop below. To prevent this from
  // happening, use a for-loop and reserve the init logic as below.

  // Parentheses added to eliminate strict JS warning in Firefox.
  for (var part; parts.length && (part = parts.shift());) {
    if (!parts.length && goog.isDef(opt_object)) {
      // last part and we have an object; use it
      cur[part] = opt_object;
    } else if (cur[part]) {
      cur = cur[part];
    } else {
      cur = cur[part] = {};
    }
  }
};


/**
 * Defines a named value. In uncompiled mode, the value is retrieved from
 * CLOSURE_DEFINES or CLOSURE_UNCOMPILED_DEFINES if the object is defined and
 * has the property specified, and otherwise used the defined defaultValue.
 * When compiled the default can be overridden using the compiler
 * options or the value set in the CLOSURE_DEFINES object.
 *
 * @param {string} name The distinguished name to provide.
 * @param {string|number|boolean} defaultValue
 */
goog.define = function(name, defaultValue) {
  var value = defaultValue;
  if (!COMPILED) {
    if (goog.global.CLOSURE_UNCOMPILED_DEFINES &&
        Object.prototype.hasOwnProperty.call(
            goog.global.CLOSURE_UNCOMPILED_DEFINES, name)) {
      value = goog.global.CLOSURE_UNCOMPILED_DEFINES[name];
    } else if (
        goog.global.CLOSURE_DEFINES &&
        Object.prototype.hasOwnProperty.call(
            goog.global.CLOSURE_DEFINES, name)) {
      value = goog.global.CLOSURE_DEFINES[name];
    }
  }
  goog.exportPath_(name, value);
};


/**
 * @define {boolean} DEBUG is provided as a convenience so that debugging code
 * that should not be included in a production js_binary can be easily stripped
 * by specifying --define goog.DEBUG=false to the JSCompiler. For example, most
 * toString() methods should be declared inside an "if (goog.DEBUG)" conditional
 * because they are generally used for debugging purposes and it is difficult
 * for the JSCompiler to statically determine whether they are used.
 */
goog.define('goog.DEBUG', true);


/**
 * @define {string} LOCALE defines the locale being used for compilation. It is
 * used to select locale specific data to be compiled in js binary. BUILD rule
 * can specify this value by "--define goog.LOCALE=<locale_name>" as JSCompiler
 * option.
 *
 * Take into account that the locale code format is important. You should use
 * the canonical Unicode format with hyphen as a delimiter. Language must be
 * lowercase, Language Script - Capitalized, Region - UPPERCASE.
 * There are few examples: pt-BR, en, en-US, sr-Latin-BO, zh-Hans-CN.
 *
 * See more info about locale codes here:
 * http://www.unicode.org/reports/tr35/#Unicode_Language_and_Locale_Identifiers
 *
 * For language codes you should use values defined by ISO 693-1. See it here
 * http://www.w3.org/WAI/ER/IG/ert/iso639.htm. There is only one exception from
 * this rule: the Hebrew language. For legacy reasons the old code (iw) should
 * be used instead of the new code (he), see http://wiki/Main/IIISynonyms.
 */
goog.define('goog.LOCALE', 'en');  // default to en


/**
 * @define {boolean} Whether this code is running on trusted sites.
 *
 * On untrusted sites, several native functions can be defined or overridden by
 * external libraries like Prototype, Datejs, and JQuery and setting this flag
 * to false forces closure to use its own implementations when possible.
 *
 * If your JavaScript can be loaded by a third party site and you are wary about
 * relying on non-standard implementations, specify
 * "--define goog.TRUSTED_SITE=false" to the JSCompiler.
 */
goog.define('goog.TRUSTED_SITE', true);


/**
 * @define {boolean} Whether a project is expected to be running in strict mode.
 *
 * This define can be used to trigger alternate implementations compatible with
 * running in EcmaScript Strict mode or warn about unavailable functionality.
 * @see https://goo.gl/PudQ4y
 *
 */
goog.define('goog.STRICT_MODE_COMPATIBLE', false);


/**
 * @define {boolean} Whether code that calls {@link goog.setTestOnly} should
 *     be disallowed in the compilation unit.
 */
goog.define('goog.DISALLOW_TEST_ONLY_CODE', COMPILED && !goog.DEBUG);


/**
 * @define {boolean} Whether to use a Chrome app CSP-compliant method for
 *     loading scripts via goog.require. @see appendScriptSrcNode_.
 */
goog.define('goog.ENABLE_CHROME_APP_SAFE_SCRIPT_LOADING', false);


/**
 * Defines a namespace in Closure.
 *
 * A namespace may only be defined once in a codebase. It may be defined using
 * goog.provide() or goog.module().
 *
 * The presence of one or more goog.provide() calls in a file indicates
 * that the file defines the given objects/namespaces.
 * Provided symbols must not be null or undefined.
 *
 * In addition, goog.provide() creates the object stubs for a namespace
 * (for example, goog.provide("goog.foo.bar") will create the object
 * goog.foo.bar if it does not already exist).
 *
 * Build tools also scan for provide/require/module statements
 * to discern dependencies, build dependency files (see deps.js), etc.
 *
 * @see goog.require
 * @see goog.module
 * @param {string} name Namespace provided by this file in the form
 *     "goog.package.part".
 */
goog.provide = function(name) {
  if (goog.isInModuleLoader_()) {
    throw Error('goog.provide can not be used within a goog.module.');
  }
  if (!COMPILED) {
    // Ensure that the same namespace isn't provided twice.
    // A goog.module/goog.provide maps a goog.require to a specific file
    if (goog.isProvided_(name)) {
      throw Error('Namespace "' + name + '" already declared.');
    }
  }

  goog.constructNamespace_(name);
};


/**
 * @param {string} name Namespace provided by this file in the form
 *     "goog.package.part".
 * @param {Object=} opt_obj The object to embed in the namespace.
 * @private
 */
goog.constructNamespace_ = function(name, opt_obj) {
  if (!COMPILED) {
    delete goog.implicitNamespaces_[name];

    var namespace = name;
    while ((namespace = namespace.substring(0, namespace.lastIndexOf('.')))) {
      if (goog.getObjectByName(namespace)) {
        break;
      }
      goog.implicitNamespaces_[namespace] = true;
    }
  }

  goog.exportPath_(name, opt_obj);
};


/**
 * Module identifier validation regexp.
 * Note: This is a conservative check, it is very possible to be more lenient,
 *   the primary exclusion here is "/" and "\" and a leading ".", these
 *   restrictions are intended to leave the door open for using goog.require
 *   with relative file paths rather than module identifiers.
 * @private
 */
goog.VALID_MODULE_RE_ = /^[a-zA-Z_$][a-zA-Z0-9._$]*$/;


/**
 * Defines a module in Closure.
 *
 * Marks that this file must be loaded as a module and claims the namespace.
 *
 * A namespace may only be defined once in a codebase. It may be defined using
 * goog.provide() or goog.module().
 *
 * goog.module() has three requirements:
 * - goog.module may not be used in the same file as goog.provide.
 * - goog.module must be the first statement in the file.
 * - only one goog.module is allowed per file.
 *
 * When a goog.module annotated file is loaded, it is enclosed in
 * a strict function closure. This means that:
 * - any variables declared in a goog.module file are private to the file
 * (not global), though the compiler is expected to inline the module.
 * - The code must obey all the rules of "strict" JavaScript.
 * - the file will be marked as "use strict"
 *
 * NOTE: unlike goog.provide, goog.module does not declare any symbols by
 * itself. If declared symbols are desired, use
 * goog.module.declareLegacyNamespace().
 *
 *
 * See the public goog.module proposal: http://goo.gl/Va1hin
 *
 * @param {string} name Namespace provided by this file in the form
 *     "goog.package.part", is expected but not required.
 */
goog.module = function(name) {
  if (!goog.isString(name) || !name ||
      name.search(goog.VALID_MODULE_RE_) == -1) {
    throw Error('Invalid module identifier');
  }
  if (!goog.isInModuleLoader_()) {
    throw Error('Module ' + name + ' has been loaded incorrectly.');
  }
  if (goog.moduleLoaderState_.moduleName) {
    throw Error('goog.module may only be called once per module.');
  }

  // Store the module name for the loader.
  goog.moduleLoaderState_.moduleName = name;
  if (!COMPILED) {
    // Ensure that the same namespace isn't provided twice.
    // A goog.module/goog.provide maps a goog.require to a specific file
    if (goog.isProvided_(name)) {
      throw Error('Namespace "' + name + '" already declared.');
    }
    delete goog.implicitNamespaces_[name];
  }
};


/**
 * @param {string} name The module identifier.
 * @return {?} The module exports for an already loaded module or null.
 *
 * Note: This is not an alternative to goog.require, it does not
 * indicate a hard dependency, instead it is used to indicate
 * an optional dependency or to access the exports of a module
 * that has already been loaded.
 * @suppress {missingProvide}
 */
goog.module.get = function(name) {
  return goog.module.getInternal_(name);
};


/**
 * @param {string} name The module identifier.
 * @return {?} The module exports for an already loaded module or null.
 * @private
 */
goog.module.getInternal_ = function(name) {
  if (!COMPILED) {
    if (goog.isProvided_(name)) {
      // goog.require only return a value with-in goog.module files.
      return name in goog.loadedModules_ ? goog.loadedModules_[name] :
                                           goog.getObjectByName(name);
    } else {
      return null;
    }
  }
};


/**
 * @private {?{moduleName: (string|undefined), declareLegacyNamespace:boolean}}
 */
goog.moduleLoaderState_ = null;


/**
 * @private
 * @return {boolean} Whether a goog.module is currently being initialized.
 */
goog.isInModuleLoader_ = function() {
  return goog.moduleLoaderState_ != null;
};


/**
 * Provide the module's exports as a globally accessible object under the
 * module's declared name.  This is intended to ease migration to goog.module
 * for files that have existing usages.
 * @suppress {missingProvide}
 */
goog.module.declareLegacyNamespace = function() {
  if (!COMPILED && !goog.isInModuleLoader_()) {
    throw new Error(
        'goog.module.declareLegacyNamespace must be called from ' +
        'within a goog.module');
  }
  if (!COMPILED && !goog.moduleLoaderState_.moduleName) {
    throw Error(
        'goog.module must be called prior to ' +
        'goog.module.declareLegacyNamespace.');
  }
  goog.moduleLoaderState_.declareLegacyNamespace = true;
};


/**
 * Marks that the current file should only be used for testing, and never for
 * live code in production.
 *
 * In the case of unit tests, the message may optionally be an exact namespace
 * for the test (e.g. 'goog.stringTest'). The linter will then ignore the extra
 * provide (if not explicitly defined in the code).
 *
 * @param {string=} opt_message Optional message to add to the error that's
 *     raised when used in production code.
 */
goog.setTestOnly = function(opt_message) {
  if (goog.DISALLOW_TEST_ONLY_CODE) {
    opt_message = opt_message || '';
    throw Error(
        'Importing test-only code into non-debug environment' +
        (opt_message ? ': ' + opt_message : '.'));
  }
};


/**
 * Forward declares a symbol. This is an indication to the compiler that the
 * symbol may be used in the source yet is not required and may not be provided
 * in compilation.
 *
 * The most common usage of forward declaration is code that takes a type as a
 * function parameter but does not need to require it. By forward declaring
 * instead of requiring, no hard dependency is made, and (if not required
 * elsewhere) the namespace may never be required and thus, not be pulled
 * into the JavaScript binary. If it is required elsewhere, it will be type
 * checked as normal.
 *
 *
 * @param {string} name The namespace to forward declare in the form of
 *     "goog.package.part".
 */
goog.forwardDeclare = function(name) {};


/**
 * Forward declare type information. Used to assign types to goog.global
 * referenced object that would otherwise result in unknown type references
 * and thus block property disambiguation.
 */
goog.forwardDeclare('Document');
goog.forwardDeclare('HTMLScriptElement');
goog.forwardDeclare('XMLHttpRequest');


if (!COMPILED) {
  /**
   * Check if the given name has been goog.provided. This will return false for
   * names that are available only as implicit namespaces.
   * @param {string} name name of the object to look for.
   * @return {boolean} Whether the name has been provided.
   * @private
   */
  goog.isProvided_ = function(name) {
    return (name in goog.loadedModules_) ||
        (!goog.implicitNamespaces_[name] &&
         goog.isDefAndNotNull(goog.getObjectByName(name)));
  };

  /**
   * Namespaces implicitly defined by goog.provide. For example,
   * goog.provide('goog.events.Event') implicitly declares that 'goog' and
   * 'goog.events' must be namespaces.
   *
   * @type {!Object<string, (boolean|undefined)>}
   * @private
   */
  goog.implicitNamespaces_ = {'goog.module': true};

  // NOTE: We add goog.module as an implicit namespace as goog.module is defined
  // here and because the existing module package has not been moved yet out of
  // the goog.module namespace. This satisifies both the debug loader and
  // ahead-of-time dependency management.
}


/**
 * Returns an object based on its fully qualified external name.  The object
 * is not found if null or undefined.  If you are using a compilation pass that
 * renames property names beware that using this function will not find renamed
 * properties.
 *
 * @param {string} name The fully qualified name.
 * @param {Object=} opt_obj The object within which to look; default is
 *     |goog.global|.
 * @return {?} The value (object or primitive) or, if not found, null.
 */
goog.getObjectByName = function(name, opt_obj) {
  var parts = name.split('.');
  var cur = opt_obj || goog.global;
  for (var part; part = parts.shift();) {
    if (goog.isDefAndNotNull(cur[part])) {
      cur = cur[part];
    } else {
      return null;
    }
  }
  return cur;
};


/**
 * Globalizes a whole namespace, such as goog or goog.lang.
 *
 * @param {!Object} obj The namespace to globalize.
 * @param {Object=} opt_global The object to add the properties to.
 * @deprecated Properties may be explicitly exported to the global scope, but
 *     this should no longer be done in bulk.
 */
goog.globalize = function(obj, opt_global) {
  var global = opt_global || goog.global;
  for (var x in obj) {
    global[x] = obj[x];
  }
};


/**
 * Adds a dependency from a file to the files it requires.
 * @param {string} relPath The path to the js file.
 * @param {!Array<string>} provides An array of strings with
 *     the names of the objects this file provides.
 * @param {!Array<string>} requires An array of strings with
 *     the names of the objects this file requires.
 * @param {boolean|!Object<string>=} opt_loadFlags Parameters indicating
 *     how the file must be loaded.  The boolean 'true' is equivalent
 *     to {'module': 'goog'} for backwards-compatibility.  Valid properties
 *     and values include {'module': 'goog'} and {'lang': 'es6'}.
 */
goog.addDependency = function(relPath, provides, requires, opt_loadFlags) {
  if (goog.DEPENDENCIES_ENABLED) {
    var provide, require;
    var path = relPath.replace(/\\/g, '/');
    var deps = goog.dependencies_;
    if (!opt_loadFlags || typeof opt_loadFlags === 'boolean') {
      opt_loadFlags = opt_loadFlags ? {'module': 'goog'} : {};
    }
    for (var i = 0; provide = provides[i]; i++) {
      deps.nameToPath[provide] = path;
      deps.loadFlags[path] = opt_loadFlags;
    }
    for (var j = 0; require = requires[j]; j++) {
      if (!(path in deps.requires)) {
        deps.requires[path] = {};
      }
      deps.requires[path][require] = true;
    }
  }
};




// NOTE(nnaze): The debug DOM loader was included in base.js as an original way
// to do "debug-mode" development.  The dependency system can sometimes be
// confusing, as can the debug DOM loader's asynchronous nature.
//
// With the DOM loader, a call to goog.require() is not blocking -- the script
// will not load until some point after the current script.  If a namespace is
// needed at runtime, it needs to be defined in a previous script, or loaded via
// require() with its registered dependencies.
//
// User-defined namespaces may need their own deps file. For a reference on
// creating a deps file, see:
// Externally: https://developers.google.com/closure/library/docs/depswriter
//
// Because of legacy clients, the DOM loader can't be easily removed from
// base.js.  Work is being done to make it disableable or replaceable for
// different environments (DOM-less JavaScript interpreters like Rhino or V8,
// for example). See bootstrap/ for more information.


/**
 * @define {boolean} Whether to enable the debug loader.
 *
 * If enabled, a call to goog.require() will attempt to load the namespace by
 * appending a script tag to the DOM (if the namespace has been registered).
 *
 * If disabled, goog.require() will simply assert that the namespace has been
 * provided (and depend on the fact that some outside tool correctly ordered
 * the script).
 */
goog.define('goog.ENABLE_DEBUG_LOADER', true);


/**
 * @param {string} msg
 * @private
 */
goog.logToConsole_ = function(msg) {
  if (goog.global.console) {
    goog.global.console['error'](msg);
  }
};


/**
 * Implements a system for the dynamic resolution of dependencies that works in
 * parallel with the BUILD system. Note that all calls to goog.require will be
 * stripped by the JSCompiler when the --process_closure_primitives option is
 * used.
 * @see goog.provide
 * @param {string} name Namespace to include (as was given in goog.provide()) in
 *     the form "goog.package.part".
 * @return {?} If called within a goog.module file, the associated namespace or
 *     module otherwise null.
 */
goog.require = function(name) {
  // If the object already exists we do not need do do anything.
  if (!COMPILED) {
    if (goog.ENABLE_DEBUG_LOADER && goog.IS_OLD_IE_) {
      goog.maybeProcessDeferredDep_(name);
    }

    if (goog.isProvided_(name)) {
      if (goog.isInModuleLoader_()) {
        return goog.module.getInternal_(name);
      } else {
        return null;
      }
    }

    if (goog.ENABLE_DEBUG_LOADER) {
      var path = goog.getPathFromDeps_(name);
      if (path) {
        goog.writeScripts_(path);
        return null;
      }
    }

    var errorMessage = 'goog.require could not find: ' + name;
    goog.logToConsole_(errorMessage);

    throw Error(errorMessage);
  }
};


/**
 * Path for included scripts.
 * @type {string}
 */
goog.basePath = '';


/**
 * A hook for overriding the base path.
 * @type {string|undefined}
 */
goog.global.CLOSURE_BASE_PATH;


/**
 * Whether to write out Closure's deps file. By default, the deps are written.
 * @type {boolean|undefined}
 */
goog.global.CLOSURE_NO_DEPS;


/**
 * A function to import a single script. This is meant to be overridden when
 * Closure is being run in non-HTML contexts, such as web workers. It's defined
 * in the global scope so that it can be set before base.js is loaded, which
 * allows deps.js to be imported properly.
 *
 * The function is passed the script source, which is a relative URI. It should
 * return true if the script was imported, false otherwise.
 * @type {(function(string): boolean)|undefined}
 */
goog.global.CLOSURE_IMPORT_SCRIPT;


/**
 * Null function used for default values of callbacks, etc.
 * @return {void} Nothing.
 */
goog.nullFunction = function() {};


/**
 * When defining a class Foo with an abstract method bar(), you can do:
 * Foo.prototype.bar = goog.abstractMethod
 *
 * Now if a subclass of Foo fails to override bar(), an error will be thrown
 * when bar() is invoked.
 *
 * Note: This does not take the name of the function to override as an argument
 * because that would make it more difficult to obfuscate our JavaScript code.
 *
 * @type {!Function}
 * @throws {Error} when invoked to indicate the method should be overridden.
 */
goog.abstractMethod = function() {
  throw Error('unimplemented abstract method');
};


/**
 * Adds a {@code getInstance} static method that always returns the same
 * instance object.
 * @param {!Function} ctor The constructor for the class to add the static
 *     method to.
 */
goog.addSingletonGetter = function(ctor) {
  ctor.getInstance = function() {
    if (ctor.instance_) {
      return ctor.instance_;
    }
    if (goog.DEBUG) {
      // NOTE: JSCompiler can't optimize away Array#push.
      goog.instantiatedSingletons_[goog.instantiatedSingletons_.length] = ctor;
    }
    return ctor.instance_ = new ctor;
  };
};


/**
 * All singleton classes that have been instantiated, for testing. Don't read
 * it directly, use the {@code goog.testing.singleton} module. The compiler
 * removes this variable if unused.
 * @type {!Array<!Function>}
 * @private
 */
goog.instantiatedSingletons_ = [];


/**
 * @define {boolean} Whether to load goog.modules using {@code eval} when using
 * the debug loader.  This provides a better debugging experience as the
 * source is unmodified and can be edited using Chrome Workspaces or similar.
 * However in some environments the use of {@code eval} is banned
 * so we provide an alternative.
 */
goog.define('goog.LOAD_MODULE_USING_EVAL', true);


/**
 * @define {boolean} Whether the exports of goog.modules should be sealed when
 * possible.
 */
goog.define('goog.SEAL_MODULE_EXPORTS', goog.DEBUG);


/**
 * The registry of initialized modules:
 * the module identifier to module exports map.
 * @private @const {!Object<string, ?>}
 */
goog.loadedModules_ = {};


/**
 * True if goog.dependencies_ is available.
 * @const {boolean}
 */
goog.DEPENDENCIES_ENABLED = !COMPILED && goog.ENABLE_DEBUG_LOADER;


/**
 * @define {string} How to decide whether to transpile.  Valid values
 * are 'always', 'never', and 'detect'.  The default ('detect') is to
 * use feature detection to determine which language levels need
 * transpilation.
 */
// NOTE(user): we could expand this to accept a language level to bypass
// detection: e.g. goog.TRANSPILE == 'es5' would transpile ES6 files but
// would leave ES3 and ES5 files alone.
goog.define('goog.TRANSPILE', 'detect');


/**
 * @define {string} Path to the transpiler.  Executing the script at this
 * path (relative to base.js) should define a function $jscomp.transpile.
 */
goog.define('goog.TRANSPILER', 'transpile.js');


if (goog.DEPENDENCIES_ENABLED) {
  /**
   * This object is used to keep track of dependencies and other data that is
   * used for loading scripts.
   * @private
   * @type {{
   *   loadFlags: !Object<string, !Object<string, string>>,
   *   nameToPath: !Object<string, string>,
   *   requires: !Object<string, !Object<string, boolean>>,
   *   visited: !Object<string, boolean>,
   *   written: !Object<string, boolean>,
   *   deferred: !Object<string, string>
   * }}
   */
  goog.dependencies_ = {
    loadFlags: {},  // 1 to 1

    nameToPath: {},  // 1 to 1

    requires: {},  // 1 to many

    // Used when resolving dependencies to prevent us from visiting file twice.
    visited: {},

    written: {},  // Used to keep track of script files we have written.

    deferred: {}  // Used to track deferred module evaluations in old IEs
  };


  /**
   * Tries to detect whether is in the context of an HTML document.
   * @return {boolean} True if it looks like HTML document.
   * @private
   */
  goog.inHtmlDocument_ = function() {
    /** @type {Document} */
    var doc = goog.global.document;
    return doc != null && 'write' in doc;  // XULDocument misses write.
  };


  /**
   * Tries to detect the base path of base.js script that bootstraps Closure.
   * @private
   */
  goog.findBasePath_ = function() {
    if (goog.isDef(goog.global.CLOSURE_BASE_PATH)) {
      goog.basePath = goog.global.CLOSURE_BASE_PATH;
      return;
    } else if (!goog.inHtmlDocument_()) {
      return;
    }
    /** @type {Document} */
    var doc = goog.global.document;
    var scripts = doc.getElementsByTagName('SCRIPT');
    // Search backwards since the current script is in almost all cases the one
    // that has base.js.
    for (var i = scripts.length - 1; i >= 0; --i) {
      var script = /** @type {!HTMLScriptElement} */ (scripts[i]);
      var src = script.src;
      var qmark = src.lastIndexOf('?');
      var l = qmark == -1 ? src.length : qmark;
      if (src.substr(l - 7, 7) == 'base.js') {
        goog.basePath = src.substr(0, l - 7);
        return;
      }
    }
  };


  /**
   * Imports a script if, and only if, that script hasn't already been imported.
   * (Must be called at execution time)
   * @param {string} src Script source.
   * @param {string=} opt_sourceText The optionally source text to evaluate
   * @private
   */
  goog.importScript_ = function(src, opt_sourceText) {
    var importScript =
        goog.global.CLOSURE_IMPORT_SCRIPT || goog.writeScriptTag_;
    if (importScript(src, opt_sourceText)) {
      goog.dependencies_.written[src] = true;
    }
  };


  /**
   * Whether the browser is IE9 or earlier, which needs special handling
   * for deferred modules.
   * @const @private {boolean}
   */
  goog.IS_OLD_IE_ =
      !!(!goog.global.atob && goog.global.document && goog.global.document.all);


  /**
   * Given a URL initiate retrieval and execution of a script that needs
   * pre-processing.
   * @param {string} src Script source URL.
   * @param {boolean} isModule Whether this is a goog.module.
   * @param {boolean} needsTranspile Whether this source needs transpilation.
   * @private
   */
  goog.importProcessedScript_ = function(src, isModule, needsTranspile) {
    // In an attempt to keep browsers from timing out loading scripts using
    // synchronous XHRs, put each load in its own script block.
    var bootstrap = 'goog.retrieveAndExec_("' + src + '", ' + isModule + ', ' +
        needsTranspile + ');';

    goog.importScript_('', bootstrap);
  };


  /** @private {!Array<string>} */
  goog.queuedModules_ = [];


  /**
   * Return an appropriate module text. Suitable to insert into
   * a script tag (that is unescaped).
   * @param {string} srcUrl
   * @param {string} scriptText
   * @return {string}
   * @private
   */
  goog.wrapModule_ = function(srcUrl, scriptText) {
    if (!goog.LOAD_MODULE_USING_EVAL || !goog.isDef(goog.global.JSON)) {
      return '' +
          'goog.loadModule(function(exports) {' +
          '"use strict";' + scriptText +
          '\n' +  // terminate any trailing single line comment.
          ';return exports' +
          '});' +
          '\n//# sourceURL=' + srcUrl + '\n';
    } else {
      return '' +
          'goog.loadModule(' +
          goog.global.JSON.stringify(
              scriptText + '\n//# sourceURL=' + srcUrl + '\n') +
          ');';
    }
  };

  // On IE9 and earlier, it is necessary to handle
  // deferred module loads. In later browsers, the
  // code to be evaluated is simply inserted as a script
  // block in the correct order. To eval deferred
  // code at the right time, we piggy back on goog.require to call
  // goog.maybeProcessDeferredDep_.
  //
  // The goog.requires are used both to bootstrap
  // the loading process (when no deps are available) and
  // declare that they should be available.
  //
  // Here we eval the sources, if all the deps are available
  // either already eval'd or goog.require'd.  This will
  // be the case when all the dependencies have already
  // been loaded, and the dependent module is loaded.
  //
  // But this alone isn't sufficient because it is also
  // necessary to handle the case where there is no root
  // that is not deferred.  For that there we register for an event
  // and trigger goog.loadQueuedModules_ handle any remaining deferred
  // evaluations.

  /**
   * Handle any remaining deferred goog.module evals.
   * @private
   */
  goog.loadQueuedModules_ = function() {
    var count = goog.queuedModules_.length;
    if (count > 0) {
      var queue = goog.queuedModules_;
      goog.queuedModules_ = [];
      for (var i = 0; i < count; i++) {
        var path = queue[i];
        goog.maybeProcessDeferredPath_(path);
      }
    }
  };


  /**
   * Eval the named module if its dependencies are
   * available.
   * @param {string} name The module to load.
   * @private
   */
  goog.maybeProcessDeferredDep_ = function(name) {
    if (goog.isDeferredModule_(name) && goog.allDepsAreAvailable_(name)) {
      var path = goog.getPathFromDeps_(name);
      goog.maybeProcessDeferredPath_(goog.basePath + path);
    }
  };

  /**
   * @param {string} name The module to check.
   * @return {boolean} Whether the name represents a
   *     module whose evaluation has been deferred.
   * @private
   */
  goog.isDeferredModule_ = function(name) {
    var path = goog.getPathFromDeps_(name);
    var loadFlags = path && goog.dependencies_.loadFlags[path] || {};
    if (path && (loadFlags['module'] == 'goog' ||
                 goog.needsTranspile_(loadFlags['lang']))) {
      var abspath = goog.basePath + path;
      return (abspath) in goog.dependencies_.deferred;
    }
    return false;
  };

  /**
   * @param {string} name The module to check.
   * @return {boolean} Whether the name represents a
   *     module whose declared dependencies have all been loaded
   *     (eval'd or a deferred module load)
   * @private
   */
  goog.allDepsAreAvailable_ = function(name) {
    var path = goog.getPathFromDeps_(name);
    if (path && (path in goog.dependencies_.requires)) {
      for (var requireName in goog.dependencies_.requires[path]) {
        if (!goog.isProvided_(requireName) &&
            !goog.isDeferredModule_(requireName)) {
          return false;
        }
      }
    }
    return true;
  };


  /**
   * @param {string} abspath
   * @private
   */
  goog.maybeProcessDeferredPath_ = function(abspath) {
    if (abspath in goog.dependencies_.deferred) {
      var src = goog.dependencies_.deferred[abspath];
      delete goog.dependencies_.deferred[abspath];
      goog.globalEval(src);
    }
  };


  /**
   * Load a goog.module from the provided URL.  This is not a general purpose
   * code loader and does not support late loading code, that is it should only
   * be used during page load. This method exists to support unit tests and
   * "debug" loaders that would otherwise have inserted script tags. Under the
   * hood this needs to use a synchronous XHR and is not recommeneded for
   * production code.
   *
   * The module's goog.requires must have already been satisified; an exception
   * will be thrown if this is not the case. This assumption is that no
   * "deps.js" file exists, so there is no way to discover and locate the
   * module-to-be-loaded's dependencies and no attempt is made to do so.
   *
   * There should only be one attempt to load a module.  If
   * "goog.loadModuleFromUrl" is called for an already loaded module, an
   * exception will be throw.
   *
   * @param {string} url The URL from which to attempt to load the goog.module.
   */
  goog.loadModuleFromUrl = function(url) {
    // Because this executes synchronously, we don't need to do any additional
    // bookkeeping. When "goog.loadModule" the namespace will be marked as
    // having been provided which is sufficient.
    goog.retrieveAndExec_(url, true, false);
  };


  /**
   * Writes a new script pointing to {@code src} directly into the DOM.
   *
   * NOTE: This method is not CSP-compliant. @see goog.appendScriptSrcNode_ for
   * the fallback mechanism.
   *
   * @param {string} src The script URL.
   * @private
   */
  goog.writeScriptSrcNode_ = function(src) {
    goog.global.document.write(
        '<script type="text/javascript" src="' + src + '"></' +
        'script>');
  };


  /**
   * Appends a new script node to the DOM using a CSP-compliant mechanism. This
   * method exists as a fallback for document.write (which is not allowed in a
   * strict CSP context, e.g., Chrome apps).
   *
   * NOTE: This method is not analogous to using document.write to insert a
   * <script> tag; specifically, the user agent will execute a script added by
   * document.write immediately after the current script block finishes
   * executing, whereas the DOM-appended script node will not be executed until
   * the entire document is parsed and executed. That is to say, this script is
   * added to the end of the script execution queue.
   *
   * The page must not attempt to call goog.required entities until after the
   * document has loaded, e.g., in or after the window.onload callback.
   *
   * @param {string} src The script URL.
   * @private
   */
  goog.appendScriptSrcNode_ = function(src) {
    /** @type {Document} */
    var doc = goog.global.document;
    var scriptEl =
        /** @type {HTMLScriptElement} */ (doc.createElement('script'));
    scriptEl.type = 'text/javascript';
    scriptEl.src = src;
    scriptEl.defer = false;
    scriptEl.async = false;
    doc.head.appendChild(scriptEl);
  };


  /**
   * The default implementation of the import function. Writes a script tag to
   * import the script.
   *
   * @param {string} src The script url.
   * @param {string=} opt_sourceText The optionally source text to evaluate
   * @return {boolean} True if the script was imported, false otherwise.
   * @private
   */
  goog.writeScriptTag_ = function(src, opt_sourceText) {
    if (goog.inHtmlDocument_()) {
      /** @type {!HTMLDocument} */
      var doc = goog.global.document;

      // If the user tries to require a new symbol after document load,
      // something has gone terribly wrong. Doing a document.write would
      // wipe out the page. This does not apply to the CSP-compliant method
      // of writing script tags.
      if (!goog.ENABLE_CHROME_APP_SAFE_SCRIPT_LOADING &&
          doc.readyState == 'complete') {
        // Certain test frameworks load base.js multiple times, which tries
        // to write deps.js each time. If that happens, just fail silently.
        // These frameworks wipe the page between each load of base.js, so this
        // is OK.
        var isDeps = /\bdeps.js$/.test(src);
        if (isDeps) {
          return false;
        } else {
          throw Error('Cannot write "' + src + '" after document load');
        }
      }

      if (opt_sourceText === undefined) {
        if (!goog.IS_OLD_IE_) {
          if (goog.ENABLE_CHROME_APP_SAFE_SCRIPT_LOADING) {
            goog.appendScriptSrcNode_(src);
          } else {
            goog.writeScriptSrcNode_(src);
          }
        } else {
          var state = " onreadystatechange='goog.onScriptLoad_(this, " +
              ++goog.lastNonModuleScriptIndex_ + ")' ";
          doc.write(
              '<script type="text/javascript" src="' + src + '"' + state +
              '></' +
              'script>');
        }
      } else {
        doc.write(
            '<script type="text/javascript">' + opt_sourceText + '</' +
            'script>');
      }
      return true;
    } else {
      return false;
    }
  };


  /**
   * Determines whether the given language needs to be transpiled.
   * @param {string} lang
   * @return {boolean}
   * @private
   */
  goog.needsTranspile_ = function(lang) {
    if (goog.TRANSPILE == 'always') {
      return true;
    } else if (goog.TRANSPILE == 'never') {
      return false;
    } else if (!goog.transpiledLanguages_) {
      goog.transpiledLanguages_ = {'es5': true, 'es6': true, 'es6-impl': true};
      /** @preserveTry */
      try {
        // Perform some quick conformance checks, to distinguish
        // between browsers that support es5, es6-impl, or es6.

        // Identify ES3-only browsers by their incorrect treatment of commas.
        goog.transpiledLanguages_['es5'] = eval('[1,].length!=1');

        // As browsers mature, features will be moved from the full test
        // into the impl test.  This must happen before the corresponding
        // features are changed in the Closure Compiler's FeatureSet object.

        // Test 1: es6-impl [FF49, Edge 13, Chrome 49]
        //   (a) let/const keyword, (b) class expressions, (c) Map object,
        //   (d) iterable arguments, (e) spread operator
        var es6implTest =
            'let a={};const X=class{constructor(){}x(z){return new Map([' +
            '...arguments]).get(z[0])==3}};return new X().x([a,3])';

        // Test 2: es6 [FF50 (?), Edge 14 (?), Chrome 50]
        //   (a) default params (specifically shadowing locals),
        //   (b) destructuring, (c) block-scoped functions,
        //   (d) for-of (const), (e) new.target/Reflect.construct
        var es6fullTest =
            'class X{constructor(){if(new.target!=String)throw 1;this.x=42}}' +
            'let q=Reflect.construct(X,[],String);if(q.x!=42||!(q instanceof ' +
            'String))throw 1;for(const a of[2,3]){if(a==2)continue;function ' +
            'f(z={a}){let a=0;return z.a}{function f(){return 0;}}return f()' +
            '==3}';

        if (eval('(()=>{"use strict";' + es6implTest + '})()')) {
          goog.transpiledLanguages_['es6-impl'] = false;
        }
        if (eval('(()=>{"use strict";' + es6fullTest + '})()')) {
          goog.transpiledLanguages_['es6'] = false;
        }
      } catch (err) {
      }
    }
    return !!goog.transpiledLanguages_[lang];
  };


  /** @private {?Object<string, boolean>} */
  goog.transpiledLanguages_ = null;


  /** @private {number} */
  goog.lastNonModuleScriptIndex_ = 0;


  /**
   * A readystatechange handler for legacy IE
   * @param {!HTMLScriptElement} script
   * @param {number} scriptIndex
   * @return {boolean}
   * @private
   */
  goog.onScriptLoad_ = function(script, scriptIndex) {
    // for now load the modules when we reach the last script,
    // later allow more inter-mingling.
    if (script.readyState == 'complete' &&
        goog.lastNonModuleScriptIndex_ == scriptIndex) {
      goog.loadQueuedModules_();
    }
    return true;
  };

  /**
   * Resolves dependencies based on the dependencies added using addDependency
   * and calls importScript_ in the correct order.
   * @param {string} pathToLoad The path from which to start discovering
   *     dependencies.
   * @private
   */
  goog.writeScripts_ = function(pathToLoad) {
    /** @type {!Array<string>} The scripts we need to write this time. */
    var scripts = [];
    var seenScript = {};
    var deps = goog.dependencies_;

    /** @param {string} path */
    function visitNode(path) {
      if (path in deps.written) {
        return;
      }

      // We have already visited this one. We can get here if we have cyclic
      // dependencies.
      if (path in deps.visited) {
        return;
      }

      deps.visited[path] = true;

      if (path in deps.requires) {
        for (var requireName in deps.requires[path]) {
          // If the required name is defined, we assume that it was already
          // bootstrapped by other means.
          if (!goog.isProvided_(requireName)) {
            if (requireName in deps.nameToPath) {
              visitNode(deps.nameToPath[requireName]);
            } else {
              throw Error('Undefined nameToPath for ' + requireName);
            }
          }
        }
      }

      if (!(path in seenScript)) {
        seenScript[path] = true;
        scripts.push(path);
      }
    }

    visitNode(pathToLoad);

    // record that we are going to load all these scripts.
    for (var i = 0; i < scripts.length; i++) {
      var path = scripts[i];
      goog.dependencies_.written[path] = true;
    }

    // If a module is loaded synchronously then we need to
    // clear the current inModuleLoader value, and restore it when we are
    // done loading the current "requires".
    var moduleState = goog.moduleLoaderState_;
    goog.moduleLoaderState_ = null;

    for (var i = 0; i < scripts.length; i++) {
      var path = scripts[i];
      if (path) {
        var loadFlags = deps.loadFlags[path] || {};
        var needsTranspile = goog.needsTranspile_(loadFlags['lang']);
        if (loadFlags['module'] == 'goog' || needsTranspile) {
          goog.importProcessedScript_(
              goog.basePath + path, loadFlags['module'] == 'goog',
              needsTranspile);
        } else {
          goog.importScript_(goog.basePath + path);
        }
      } else {
        goog.moduleLoaderState_ = moduleState;
        throw Error('Undefined script input');
      }
    }

    // restore the current "module loading state"
    goog.moduleLoaderState_ = moduleState;
  };


  /**
   * Looks at the dependency rules and tries to determine the script file that
   * fulfills a particular rule.
   * @param {string} rule In the form goog.namespace.Class or project.script.
   * @return {?string} Url corresponding to the rule, or null.
   * @private
   */
  goog.getPathFromDeps_ = function(rule) {
    if (rule in goog.dependencies_.nameToPath) {
      return goog.dependencies_.nameToPath[rule];
    } else {
      return null;
    }
  };

  goog.findBasePath_();

  // Allow projects to manage the deps files themselves.
  if (!goog.global.CLOSURE_NO_DEPS) {
    goog.importScript_(goog.basePath + 'deps.js');
  }
}


/**
 * @param {function(?):?|string} moduleDef The module definition.
 */
goog.loadModule = function(moduleDef) {
  // NOTE: we allow function definitions to be either in the from
  // of a string to eval (which keeps the original source intact) or
  // in a eval forbidden environment (CSP) we allow a function definition
  // which in its body must call {@code goog.module}, and return the exports
  // of the module.
  var previousState = goog.moduleLoaderState_;
  try {
    goog.moduleLoaderState_ = {
      moduleName: undefined,
      declareLegacyNamespace: false
    };
    var exports;
    if (goog.isFunction(moduleDef)) {
      exports = moduleDef.call(undefined, {});
    } else if (goog.isString(moduleDef)) {
      exports = goog.loadModuleFromSource_.call(undefined, moduleDef);
    } else {
      throw Error('Invalid module definition');
    }

    var moduleName = goog.moduleLoaderState_.moduleName;
    if (!goog.isString(moduleName) || !moduleName) {
      throw Error('Invalid module name \"' + moduleName + '\"');
    }

    // Don't seal legacy namespaces as they may be uses as a parent of
    // another namespace
    if (goog.moduleLoaderState_.declareLegacyNamespace) {
      goog.constructNamespace_(moduleName, exports);
    } else if (goog.SEAL_MODULE_EXPORTS && Object.seal) {
      Object.seal(exports);
    }

    goog.loadedModules_[moduleName] = exports;
  } finally {
    goog.moduleLoaderState_ = previousState;
  }
};


/**
 * @private @const {function(string):?}
 *
 * The new type inference warns because this function has no formal
 * parameters, but its jsdoc says that it takes one argument.
 * (The argument is used via arguments[0], but NTI does not detect this.)
 * @suppress {newCheckTypes}
 */
goog.loadModuleFromSource_ = function() {
  // NOTE: we avoid declaring parameters or local variables here to avoid
  // masking globals or leaking values into the module definition.
  'use strict';
  var exports = {};
  eval(arguments[0]);
  return exports;
};


/**
 * Normalize a file path by removing redundant ".." and extraneous "." file
 * path components.
 * @param {string} path
 * @return {string}
 * @private
 */
goog.normalizePath_ = function(path) {
  var components = path.split('/');
  var i = 0;
  while (i < components.length) {
    if (components[i] == '.') {
      components.splice(i, 1);
    } else if (
        i && components[i] == '..' && components[i - 1] &&
        components[i - 1] != '..') {
      components.splice(--i, 2);
    } else {
      i++;
    }
  }
  return components.join('/');
};


/**
 * Loads file by synchronous XHR. Should not be used in production environments.
 * @param {string} src Source URL.
 * @return {?string} File contents, or null if load failed.
 * @private
 */
goog.loadFileSync_ = function(src) {
  if (goog.global.CLOSURE_LOAD_FILE_SYNC) {
    return goog.global.CLOSURE_LOAD_FILE_SYNC(src);
  } else {
    try {
      /** @type {XMLHttpRequest} */
      var xhr = new goog.global['XMLHttpRequest']();
      xhr.open('get', src, false);
      xhr.send();
      // NOTE: Successful http: requests have a status of 200, but successful
      // file: requests may have a status of zero.  Any other status, or a
      // thrown exception (particularly in case of file: requests) indicates
      // some sort of error, which we treat as a missing or unavailable file.
      return xhr.status == 0 || xhr.status == 200 ? xhr.responseText : null;
    } catch (err) {
      // No need to rethrow or log, since errors should show up on their own.
      return null;
    }
  }
};


/**
 * Retrieve and execute a script that needs some sort of wrapping.
 * @param {string} src Script source URL.
 * @param {boolean} isModule Whether to load as a module.
 * @param {boolean} needsTranspile Whether to transpile down to ES3.
 * @private
 */
goog.retrieveAndExec_ = function(src, isModule, needsTranspile) {
  if (!COMPILED) {
    // The full but non-canonicalized URL for later use.
    var originalPath = src;
    // Canonicalize the path, removing any /./ or /../ since Chrome's debugging
    // console doesn't auto-canonicalize XHR loads as it does <script> srcs.
    src = goog.normalizePath_(src);

    var importScript =
        goog.global.CLOSURE_IMPORT_SCRIPT || goog.writeScriptTag_;

    var scriptText = goog.loadFileSync_(src);
    if (scriptText == null) {
      throw new Error('Load of "' + src + '" failed');
    }

    if (needsTranspile) {
      scriptText = goog.transpile_.call(goog.global, scriptText, src);
    }

    if (isModule) {
      scriptText = goog.wrapModule_(src, scriptText);
    } else {
      scriptText += '\n//# sourceURL=' + src;
    }
    var isOldIE = goog.IS_OLD_IE_;
    if (isOldIE) {
      goog.dependencies_.deferred[originalPath] = scriptText;
      goog.queuedModules_.push(originalPath);
    } else {
      importScript(src, scriptText);
    }
  }
};


/**
 * Lazily retrieves the transpiler and applies it to the source.
 * @param {string} code JS code.
 * @param {string} path Path to the code.
 * @return {string} The transpiled code.
 * @private
 */
goog.transpile_ = function(code, path) {
  var jscomp = goog.global['$jscomp'];
  if (!jscomp) {
    goog.global['$jscomp'] = jscomp = {};
  }
  var transpile = jscomp.transpile;
  if (!transpile) {
    var transpilerPath = goog.basePath + goog.TRANSPILER;
    var transpilerCode = goog.loadFileSync_(transpilerPath);
    if (transpilerCode) {
      // This must be executed synchronously, since by the time we know we
      // need it, we're about to load and write the ES6 code synchronously,
      // so a normal script-tag load will be too slow.
      eval(transpilerCode + '\n//# sourceURL=' + transpilerPath);
      // Note: transpile.js reassigns goog.global['$jscomp'] so pull it again.
      jscomp = goog.global['$jscomp'];
      transpile = jscomp.transpile;
    }
  }
  if (!transpile) {
    // The transpiler is an optional component.  If it's not available then
    // replace it with a pass-through function that simply logs.
    var suffix = ' requires transpilation but no transpiler was found.';
    transpile = jscomp.transpile = function(code, path) {
      // TODO(user): figure out some way to get this error to show up
      // in test results, noting that the failure may occur in many
      // different ways, including in loadModule() before the test
      // runner even comes up.
      goog.logToConsole_(path + suffix);
      return code;
    };
  }
  // Note: any transpilation errors/warnings will be logged to the console.
  return transpile(code, path);
};


//==============================================================================
// Language Enhancements
//==============================================================================


/**
 * This is a "fixed" version of the typeof operator.  It differs from the typeof
 * operator in such a way that null returns 'null' and arrays return 'array'.
 * @param {?} value The value to get the type of.
 * @return {string} The name of the type.
 */
goog.typeOf = function(value) {
  var s = typeof value;
  if (s == 'object') {
    if (value) {
      // Check these first, so we can avoid calling Object.prototype.toString if
      // possible.
      //
      // IE improperly marshals typeof across execution contexts, but a
      // cross-context object will still return false for "instanceof Object".
      if (value instanceof Array) {
        return 'array';
      } else if (value instanceof Object) {
        return s;
      }

      // HACK: In order to use an Object prototype method on the arbitrary
      //   value, the compiler requires the value be cast to type Object,
      //   even though the ECMA spec explicitly allows it.
      var className = Object.prototype.toString.call(
          /** @type {!Object} */ (value));
      // In Firefox 3.6, attempting to access iframe window objects' length
      // property throws an NS_ERROR_FAILURE, so we need to special-case it
      // here.
      if (className == '[object Window]') {
        return 'object';
      }

      // We cannot always use constructor == Array or instanceof Array because
      // different frames have different Array objects. In IE6, if the iframe
      // where the array was created is destroyed, the array loses its
      // prototype. Then dereferencing val.splice here throws an exception, so
      // we can't use goog.isFunction. Calling typeof directly returns 'unknown'
      // so that will work. In this case, this function will return false and
      // most array functions will still work because the array is still
      // array-like (supports length and []) even though it has lost its
      // prototype.
      // Mark Miller noticed that Object.prototype.toString
      // allows access to the unforgeable [[Class]] property.
      //  15.2.4.2 Object.prototype.toString ( )
      //  When the toString method is called, the following steps are taken:
      //      1. Get the [[Class]] property of this object.
      //      2. Compute a string value by concatenating the three strings
      //         "[object ", Result(1), and "]".
      //      3. Return Result(2).
      // and this behavior survives the destruction of the execution context.
      if ((className == '[object Array]' ||
           // In IE all non value types are wrapped as objects across window
           // boundaries (not iframe though) so we have to do object detection
           // for this edge case.
           typeof value.length == 'number' &&
               typeof value.splice != 'undefined' &&
               typeof value.propertyIsEnumerable != 'undefined' &&
               !value.propertyIsEnumerable('splice')

               )) {
        return 'array';
      }
      // HACK: There is still an array case that fails.
      //     function ArrayImpostor() {}
      //     ArrayImpostor.prototype = [];
      //     var impostor = new ArrayImpostor;
      // this can be fixed by getting rid of the fast path
      // (value instanceof Array) and solely relying on
      // (value && Object.prototype.toString.vall(value) === '[object Array]')
      // but that would require many more function calls and is not warranted
      // unless closure code is receiving objects from untrusted sources.

      // IE in cross-window calls does not correctly marshal the function type
      // (it appears just as an object) so we cannot use just typeof val ==
      // 'function'. However, if the object has a call property, it is a
      // function.
      if ((className == '[object Function]' ||
           typeof value.call != 'undefined' &&
               typeof value.propertyIsEnumerable != 'undefined' &&
               !value.propertyIsEnumerable('call'))) {
        return 'function';
      }

    } else {
      return 'null';
    }

  } else if (s == 'function' && typeof value.call == 'undefined') {
    // In Safari typeof nodeList returns 'function', and on Firefox typeof
    // behaves similarly for HTML{Applet,Embed,Object}, Elements and RegExps. We
    // would like to return object for those and we can detect an invalid
    // function by making sure that the function object has a call method.
    return 'object';
  }
  return s;
};


/**
 * Returns true if the specified value is null.
 * @param {?} val Variable to test.
 * @return {boolean} Whether variable is null.
 */
goog.isNull = function(val) {
  return val === null;
};


/**
 * Returns true if the specified value is defined and not null.
 * @param {?} val Variable to test.
 * @return {boolean} Whether variable is defined and not null.
 */
goog.isDefAndNotNull = function(val) {
  // Note that undefined == null.
  return val != null;
};


/**
 * Returns true if the specified value is an array.
 * @param {?} val Variable to test.
 * @return {boolean} Whether variable is an array.
 */
goog.isArray = function(val) {
  return goog.typeOf(val) == 'array';
};


/**
 * Returns true if the object looks like an array. To qualify as array like
 * the value needs to be either a NodeList or an object with a Number length
 * property. As a special case, a function value is not array like, because its
 * length property is fixed to correspond to the number of expected arguments.
 * @param {?} val Variable to test.
 * @return {boolean} Whether variable is an array.
 */
goog.isArrayLike = function(val) {
  var type = goog.typeOf(val);
  // We do not use goog.isObject here in order to exclude function values.
  return type == 'array' || type == 'object' && typeof val.length == 'number';
};


/**
 * Returns true if the object looks like a Date. To qualify as Date-like the
 * value needs to be an object and have a getFullYear() function.
 * @param {?} val Variable to test.
 * @return {boolean} Whether variable is a like a Date.
 */
goog.isDateLike = function(val) {
  return goog.isObject(val) && typeof val.getFullYear == 'function';
};


/**
 * Returns true if the specified value is a string.
 * @param {?} val Variable to test.
 * @return {boolean} Whether variable is a string.
 */
goog.isString = function(val) {
  return typeof val == 'string';
};


/**
 * Returns true if the specified value is a boolean.
 * @param {?} val Variable to test.
 * @return {boolean} Whether variable is boolean.
 */
goog.isBoolean = function(val) {
  return typeof val == 'boolean';
};


/**
 * Returns true if the specified value is a number.
 * @param {?} val Variable to test.
 * @return {boolean} Whether variable is a number.
 */
goog.isNumber = function(val) {
  return typeof val == 'number';
};


/**
 * Returns true if the specified value is a function.
 * @param {?} val Variable to test.
 * @return {boolean} Whether variable is a function.
 */
goog.isFunction = function(val) {
  return goog.typeOf(val) == 'function';
};


/**
 * Returns true if the specified value is an object.  This includes arrays and
 * functions.
 * @param {?} val Variable to test.
 * @return {boolean} Whether variable is an object.
 */
goog.isObject = function(val) {
  var type = typeof val;
  return type == 'object' && val != null || type == 'function';
  // return Object(val) === val also works, but is slower, especially if val is
  // not an object.
};


/**
 * Gets a unique ID for an object. This mutates the object so that further calls
 * with the same object as a parameter returns the same value. The unique ID is
 * guaranteed to be unique across the current session amongst objects that are
 * passed into {@code getUid}. There is no guarantee that the ID is unique or
 * consistent across sessions. It is unsafe to generate unique ID for function
 * prototypes.
 *
 * @param {Object} obj The object to get the unique ID for.
 * @return {number} The unique ID for the object.
 */
goog.getUid = function(obj) {
  // TODO(arv): Make the type stricter, do not accept null.

  // In Opera window.hasOwnProperty exists but always returns false so we avoid
  // using it. As a consequence the unique ID generated for BaseClass.prototype
  // and SubClass.prototype will be the same.
  return obj[goog.UID_PROPERTY_] ||
      (obj[goog.UID_PROPERTY_] = ++goog.uidCounter_);
};


/**
 * Whether the given object is already assigned a unique ID.
 *
 * This does not modify the object.
 *
 * @param {!Object} obj The object to check.
 * @return {boolean} Whether there is an assigned unique id for the object.
 */
goog.hasUid = function(obj) {
  return !!obj[goog.UID_PROPERTY_];
};


/**
 * Removes the unique ID from an object. This is useful if the object was
 * previously mutated using {@code goog.getUid} in which case the mutation is
 * undone.
 * @param {Object} obj The object to remove the unique ID field from.
 */
goog.removeUid = function(obj) {
  // TODO(arv): Make the type stricter, do not accept null.

  // In IE, DOM nodes are not instances of Object and throw an exception if we
  // try to delete.  Instead we try to use removeAttribute.
  if (obj !== null && 'removeAttribute' in obj) {
    obj.removeAttribute(goog.UID_PROPERTY_);
  }
  /** @preserveTry */
  try {
    delete obj[goog.UID_PROPERTY_];
  } catch (ex) {
  }
};


/**
 * Name for unique ID property. Initialized in a way to help avoid collisions
 * with other closure JavaScript on the same page.
 * @type {string}
 * @private
 */
goog.UID_PROPERTY_ = 'closure_uid_' + ((Math.random() * 1e9) >>> 0);


/**
 * Counter for UID.
 * @type {number}
 * @private
 */
goog.uidCounter_ = 0;


/**
 * Adds a hash code field to an object. The hash code is unique for the
 * given object.
 * @param {Object} obj The object to get the hash code for.
 * @return {number} The hash code for the object.
 * @deprecated Use goog.getUid instead.
 */
goog.getHashCode = goog.getUid;


/**
 * Removes the hash code field from an object.
 * @param {Object} obj The object to remove the field from.
 * @deprecated Use goog.removeUid instead.
 */
goog.removeHashCode = goog.removeUid;


/**
 * Clones a value. The input may be an Object, Array, or basic type. Objects and
 * arrays will be cloned recursively.
 *
 * WARNINGS:
 * <code>goog.cloneObject</code> does not detect reference loops. Objects that
 * refer to themselves will cause infinite recursion.
 *
 * <code>goog.cloneObject</code> is unaware of unique identifiers, and copies
 * UIDs created by <code>getUid</code> into cloned results.
 *
 * @param {*} obj The value to clone.
 * @return {*} A clone of the input value.
 * @deprecated goog.cloneObject is unsafe. Prefer the goog.object methods.
 */
goog.cloneObject = function(obj) {
  var type = goog.typeOf(obj);
  if (type == 'object' || type == 'array') {
    if (obj.clone) {
      return obj.clone();
    }
    var clone = type == 'array' ? [] : {};
    for (var key in obj) {
      clone[key] = goog.cloneObject(obj[key]);
    }
    return clone;
  }

  return obj;
};


/**
 * A native implementation of goog.bind.
 * @param {Function} fn A function to partially apply.
 * @param {Object|undefined} selfObj Specifies the object which this should
 *     point to when the function is run.
 * @param {...*} var_args Additional arguments that are partially applied to the
 *     function.
 * @return {!Function} A partially-applied form of the function bind() was
 *     invoked as a method of.
 * @private
 * @suppress {deprecated} The compiler thinks that Function.prototype.bind is
 *     deprecated because some people have declared a pure-JS version.
 *     Only the pure-JS version is truly deprecated.
 */
goog.bindNative_ = function(fn, selfObj, var_args) {
  return /** @type {!Function} */ (fn.call.apply(fn.bind, arguments));
};


/**
 * A pure-JS implementation of goog.bind.
 * @param {Function} fn A function to partially apply.
 * @param {Object|undefined} selfObj Specifies the object which this should
 *     point to when the function is run.
 * @param {...*} var_args Additional arguments that are partially applied to the
 *     function.
 * @return {!Function} A partially-applied form of the function bind() was
 *     invoked as a method of.
 * @private
 */
goog.bindJs_ = function(fn, selfObj, var_args) {
  if (!fn) {
    throw new Error();
  }

  if (arguments.length > 2) {
    var boundArgs = Array.prototype.slice.call(arguments, 2);
    return function() {
      // Prepend the bound arguments to the current arguments.
      var newArgs = Array.prototype.slice.call(arguments);
      Array.prototype.unshift.apply(newArgs, boundArgs);
      return fn.apply(selfObj, newArgs);
    };

  } else {
    return function() { return fn.apply(selfObj, arguments); };
  }
};


/**
 * Partially applies this function to a particular 'this object' and zero or
 * more arguments. The result is a new function with some arguments of the first
 * function pre-filled and the value of this 'pre-specified'.
 *
 * Remaining arguments specified at call-time are appended to the pre-specified
 * ones.
 *
 * Also see: {@link #partial}.
 *
 * Usage:
 * <pre>var barMethBound = goog.bind(myFunction, myObj, 'arg1', 'arg2');
 * barMethBound('arg3', 'arg4');</pre>
 *
 * @param {?function(this:T, ...)} fn A function to partially apply.
 * @param {T} selfObj Specifies the object which this should point to when the
 *     function is run.
 * @param {...*} var_args Additional arguments that are partially applied to the
 *     function.
 * @return {!Function} A partially-applied form of the function goog.bind() was
 *     invoked as a method of.
 * @template T
 * @suppress {deprecated} See above.
 */
goog.bind = function(fn, selfObj, var_args) {
  // TODO(nicksantos): narrow the type signature.
  if (Function.prototype.bind &&
      // NOTE(nicksantos): Somebody pulled base.js into the default Chrome
      // extension environment. This means that for Chrome extensions, they get
      // the implementation of Function.prototype.bind that calls goog.bind
      // instead of the native one. Even worse, we don't want to introduce a
      // circular dependency between goog.bind and Function.prototype.bind, so
      // we have to hack this to make sure it works correctly.
      Function.prototype.bind.toString().indexOf('native code') != -1) {
    goog.bind = goog.bindNative_;
  } else {
    goog.bind = goog.bindJs_;
  }
  return goog.bind.apply(null, arguments);
};


/**
 * Like goog.bind(), except that a 'this object' is not required. Useful when
 * the target function is already bound.
 *
 * Usage:
 * var g = goog.partial(f, arg1, arg2);
 * g(arg3, arg4);
 *
 * @param {Function} fn A function to partially apply.
 * @param {...*} var_args Additional arguments that are partially applied to fn.
 * @return {!Function} A partially-applied form of the function goog.partial()
 *     was invoked as a method of.
 */
goog.partial = function(fn, var_args) {
  var args = Array.prototype.slice.call(arguments, 1);
  return function() {
    // Clone the array (with slice()) and append additional arguments
    // to the existing arguments.
    var newArgs = args.slice();
    newArgs.push.apply(newArgs, arguments);
    return fn.apply(this, newArgs);
  };
};


/**
 * Copies all the members of a source object to a target object. This method
 * does not work on all browsers for all objects that contain keys such as
 * toString or hasOwnProperty. Use goog.object.extend for this purpose.
 * @param {Object} target Target.
 * @param {Object} source Source.
 */
goog.mixin = function(target, source) {
  for (var x in source) {
    target[x] = source[x];
  }

  // For IE7 or lower, the for-in-loop does not contain any properties that are
  // not enumerable on the prototype object (for example, isPrototypeOf from
  // Object.prototype) but also it will not include 'replace' on objects that
  // extend String and change 'replace' (not that it is common for anyone to
  // extend anything except Object).
};


/**
 * @return {number} An integer value representing the number of milliseconds
 *     between midnight, January 1, 1970 and the current time.
 */
goog.now = (goog.TRUSTED_SITE && Date.now) || (function() {
             // Unary plus operator converts its operand to a number which in
             // the case of
             // a date is done by calling getTime().
             return +new Date();
           });


/**
 * Evals JavaScript in the global scope.  In IE this uses execScript, other
 * browsers use goog.global.eval. If goog.global.eval does not evaluate in the
 * global scope (for example, in Safari), appends a script tag instead.
 * Throws an exception if neither execScript or eval is defined.
 * @param {string} script JavaScript string.
 */
goog.globalEval = function(script) {
  if (goog.global.execScript) {
    goog.global.execScript(script, 'JavaScript');
  } else if (goog.global.eval) {
    // Test to see if eval works
    if (goog.evalWorksForGlobals_ == null) {
      goog.global.eval('var _evalTest_ = 1;');
      if (typeof goog.global['_evalTest_'] != 'undefined') {
        try {
          delete goog.global['_evalTest_'];
        } catch (ignore) {
          // Microsoft edge fails the deletion above in strict mode.
        }
        goog.evalWorksForGlobals_ = true;
      } else {
        goog.evalWorksForGlobals_ = false;
      }
    }

    if (goog.evalWorksForGlobals_) {
      goog.global.eval(script);
    } else {
      /** @type {Document} */
      var doc = goog.global.document;
      var scriptElt =
          /** @type {!HTMLScriptElement} */ (doc.createElement('SCRIPT'));
      scriptElt.type = 'text/javascript';
      scriptElt.defer = false;
      // Note(user): can't use .innerHTML since "t('<test>')" will fail and
      // .text doesn't work in Safari 2.  Therefore we append a text node.
      scriptElt.appendChild(doc.createTextNode(script));
      doc.body.appendChild(scriptElt);
      doc.body.removeChild(scriptElt);
    }
  } else {
    throw Error('goog.globalEval not available');
  }
};


/**
 * Indicates whether or not we can call 'eval' directly to eval code in the
 * global scope. Set to a Boolean by the first call to goog.globalEval (which
 * empirically tests whether eval works for globals). @see goog.globalEval
 * @type {?boolean}
 * @private
 */
goog.evalWorksForGlobals_ = null;


/**
 * Optional map of CSS class names to obfuscated names used with
 * goog.getCssName().
 * @private {!Object<string, string>|undefined}
 * @see goog.setCssNameMapping
 */
goog.cssNameMapping_;


/**
 * Optional obfuscation style for CSS class names. Should be set to either
 * 'BY_WHOLE' or 'BY_PART' if defined.
 * @type {string|undefined}
 * @private
 * @see goog.setCssNameMapping
 */
goog.cssNameMappingStyle_;


/**
 * Handles strings that are intended to be used as CSS class names.
 *
 * This function works in tandem with @see goog.setCssNameMapping.
 *
 * Without any mapping set, the arguments are simple joined with a hyphen and
 * passed through unaltered.
 *
 * When there is a mapping, there are two possible styles in which these
 * mappings are used. In the BY_PART style, each part (i.e. in between hyphens)
 * of the passed in css name is rewritten according to the map. In the BY_WHOLE
 * style, the full css name is looked up in the map directly. If a rewrite is
 * not specified by the map, the compiler will output a warning.
 *
 * When the mapping is passed to the compiler, it will replace calls to
 * goog.getCssName with the strings from the mapping, e.g.
 *     var x = goog.getCssName('foo');
 *     var y = goog.getCssName(this.baseClass, 'active');
 *  becomes:
 *     var x = 'foo';
 *     var y = this.baseClass + '-active';
 *
 * If one argument is passed it will be processed, if two are passed only the
 * modifier will be processed, as it is assumed the first argument was generated
 * as a result of calling goog.getCssName.
 *
 * @param {string} className The class name.
 * @param {string=} opt_modifier A modifier to be appended to the class name.
 * @return {string} The class name or the concatenation of the class name and
 *     the modifier.
 */
goog.getCssName = function(className, opt_modifier) {
  var getMapping = function(cssName) {
    return goog.cssNameMapping_[cssName] || cssName;
  };

  var renameByParts = function(cssName) {
    // Remap all the parts individually.
    var parts = cssName.split('-');
    var mapped = [];
    for (var i = 0; i < parts.length; i++) {
      mapped.push(getMapping(parts[i]));
    }
    return mapped.join('-');
  };

  var rename;
  if (goog.cssNameMapping_) {
    rename =
        goog.cssNameMappingStyle_ == 'BY_WHOLE' ? getMapping : renameByParts;
  } else {
    rename = function(a) { return a; };
  }

  if (opt_modifier) {
    return className + '-' + rename(opt_modifier);
  } else {
    return rename(className);
  }
};


/**
 * Sets the map to check when returning a value from goog.getCssName(). Example:
 * <pre>
 * goog.setCssNameMapping({
 *   "goog": "a",
 *   "disabled": "b",
 * });
 *
 * var x = goog.getCssName('goog');
 * // The following evaluates to: "a a-b".
 * goog.getCssName('goog') + ' ' + goog.getCssName(x, 'disabled')
 * </pre>
 * When declared as a map of string literals to string literals, the JSCompiler
 * will replace all calls to goog.getCssName() using the supplied map if the
 * --process_closure_primitives flag is set.
 *
 * @param {!Object} mapping A map of strings to strings where keys are possible
 *     arguments to goog.getCssName() and values are the corresponding values
 *     that should be returned.
 * @param {string=} opt_style The style of css name mapping. There are two valid
 *     options: 'BY_PART', and 'BY_WHOLE'.
 * @see goog.getCssName for a description.
 */
goog.setCssNameMapping = function(mapping, opt_style) {
  goog.cssNameMapping_ = mapping;
  goog.cssNameMappingStyle_ = opt_style;
};


/**
 * To use CSS renaming in compiled mode, one of the input files should have a
 * call to goog.setCssNameMapping() with an object literal that the JSCompiler
 * can extract and use to replace all calls to goog.getCssName(). In uncompiled
 * mode, JavaScript code should be loaded before this base.js file that declares
 * a global variable, CLOSURE_CSS_NAME_MAPPING, which is used below. This is
 * to ensure that the mapping is loaded before any calls to goog.getCssName()
 * are made in uncompiled mode.
 *
 * A hook for overriding the CSS name mapping.
 * @type {!Object<string, string>|undefined}
 */
goog.global.CLOSURE_CSS_NAME_MAPPING;


if (!COMPILED && goog.global.CLOSURE_CSS_NAME_MAPPING) {
  // This does not call goog.setCssNameMapping() because the JSCompiler
  // requires that goog.setCssNameMapping() be called with an object literal.
  goog.cssNameMapping_ = goog.global.CLOSURE_CSS_NAME_MAPPING;
}


/**
 * Gets a localized message.
 *
 * This function is a compiler primitive. If you give the compiler a localized
 * message bundle, it will replace the string at compile-time with a localized
 * version, and expand goog.getMsg call to a concatenated string.
 *
 * Messages must be initialized in the form:
 * <code>
 * var MSG_NAME = goog.getMsg('Hello {$placeholder}', {'placeholder': 'world'});
 * </code>
 *
 * This function produces a string which should be treated as plain text. Use
 * {@link goog.html.SafeHtmlFormatter} in conjunction with goog.getMsg to
 * produce SafeHtml.
 *
 * @param {string} str Translatable string, places holders in the form {$foo}.
 * @param {Object<string, string>=} opt_values Maps place holder name to value.
 * @return {string} message with placeholders filled.
 */
goog.getMsg = function(str, opt_values) {
  if (opt_values) {
    str = str.replace(/\{\$([^}]+)}/g, function(match, key) {
      return (opt_values != null && key in opt_values) ? opt_values[key] :
                                                         match;
    });
  }
  return str;
};


/**
 * Gets a localized message. If the message does not have a translation, gives a
 * fallback message.
 *
 * This is useful when introducing a new message that has not yet been
 * translated into all languages.
 *
 * This function is a compiler primitive. Must be used in the form:
 * <code>var x = goog.getMsgWithFallback(MSG_A, MSG_B);</code>
 * where MSG_A and MSG_B were initialized with goog.getMsg.
 *
 * @param {string} a The preferred message.
 * @param {string} b The fallback message.
 * @return {string} The best translated message.
 */
goog.getMsgWithFallback = function(a, b) {
  return a;
};


/**
 * Exposes an unobfuscated global namespace path for the given object.
 * Note that fields of the exported object *will* be obfuscated, unless they are
 * exported in turn via this function or goog.exportProperty.
 *
 * Also handy for making public items that are defined in anonymous closures.
 *
 * ex. goog.exportSymbol('public.path.Foo', Foo);
 *
 * ex. goog.exportSymbol('public.path.Foo.staticFunction', Foo.staticFunction);
 *     public.path.Foo.staticFunction();
 *
 * ex. goog.exportSymbol('public.path.Foo.prototype.myMethod',
 *                       Foo.prototype.myMethod);
 *     new public.path.Foo().myMethod();
 *
 * @param {string} publicPath Unobfuscated name to export.
 * @param {*} object Object the name should point to.
 * @param {Object=} opt_objectToExportTo The object to add the path to; default
 *     is goog.global.
 */
goog.exportSymbol = function(publicPath, object, opt_objectToExportTo) {
  goog.exportPath_(publicPath, object, opt_objectToExportTo);
};


/**
 * Exports a property unobfuscated into the object's namespace.
 * ex. goog.exportProperty(Foo, 'staticFunction', Foo.staticFunction);
 * ex. goog.exportProperty(Foo.prototype, 'myMethod', Foo.prototype.myMethod);
 * @param {Object} object Object whose static property is being exported.
 * @param {string} publicName Unobfuscated name to export.
 * @param {*} symbol Object the name should point to.
 */
goog.exportProperty = function(object, publicName, symbol) {
  object[publicName] = symbol;
};


/**
 * Inherit the prototype methods from one constructor into another.
 *
 * Usage:
 * <pre>
 * function ParentClass(a, b) { }
 * ParentClass.prototype.foo = function(a) { };
 *
 * function ChildClass(a, b, c) {
 *   ChildClass.base(this, 'constructor', a, b);
 * }
 * goog.inherits(ChildClass, ParentClass);
 *
 * var child = new ChildClass('a', 'b', 'see');
 * child.foo(); // This works.
 * </pre>
 *
 * @param {!Function} childCtor Child class.
 * @param {!Function} parentCtor Parent class.
 */
goog.inherits = function(childCtor, parentCtor) {
  /** @constructor */
  function tempCtor() {}
  tempCtor.prototype = parentCtor.prototype;
  childCtor.superClass_ = parentCtor.prototype;
  childCtor.prototype = new tempCtor();
  /** @override */
  childCtor.prototype.constructor = childCtor;

  /**
   * Calls superclass constructor/method.
   *
   * This function is only available if you use goog.inherits to
   * express inheritance relationships between classes.
   *
   * NOTE: This is a replacement for goog.base and for superClass_
   * property defined in childCtor.
   *
   * @param {!Object} me Should always be "this".
   * @param {string} methodName The method name to call. Calling
   *     superclass constructor can be done with the special string
   *     'constructor'.
   * @param {...*} var_args The arguments to pass to superclass
   *     method/constructor.
   * @return {*} The return value of the superclass method/constructor.
   */
  childCtor.base = function(me, methodName, var_args) {
    // Copying using loop to avoid deop due to passing arguments object to
    // function. This is faster in many JS engines as of late 2014.
    var args = new Array(arguments.length - 2);
    for (var i = 2; i < arguments.length; i++) {
      args[i - 2] = arguments[i];
    }
    return parentCtor.prototype[methodName].apply(me, args);
  };
};


/**
 * Call up to the superclass.
 *
 * If this is called from a constructor, then this calls the superclass
 * constructor with arguments 1-N.
 *
 * If this is called from a prototype method, then you must pass the name of the
 * method as the second argument to this function. If you do not, you will get a
 * runtime error. This calls the superclass' method with arguments 2-N.
 *
 * This function only works if you use goog.inherits to express inheritance
 * relationships between your classes.
 *
 * This function is a compiler primitive. At compile-time, the compiler will do
 * macro expansion to remove a lot of the extra overhead that this function
 * introduces. The compiler will also enforce a lot of the assumptions that this
 * function makes, and treat it as a compiler error if you break them.
 *
 * @param {!Object} me Should always be "this".
 * @param {*=} opt_methodName The method name if calling a super method.
 * @param {...*} var_args The rest of the arguments.
 * @return {*} The return value of the superclass method.
 * @suppress {es5Strict} This method can not be used in strict mode, but
 *     all Closure Library consumers must depend on this file.
 */
goog.base = function(me, opt_methodName, var_args) {
  var caller = arguments.callee.caller;

  if (goog.STRICT_MODE_COMPATIBLE || (goog.DEBUG && !caller)) {
    throw Error(
        'arguments.caller not defined.  goog.base() cannot be used ' +
        'with strict mode code. See ' +
        'http://www.ecma-international.org/ecma-262/5.1/#sec-C');
  }

  if (caller.superClass_) {
    // Copying using loop to avoid deop due to passing arguments object to
    // function. This is faster in many JS engines as of late 2014.
    var ctorArgs = new Array(arguments.length - 1);
    for (var i = 1; i < arguments.length; i++) {
      ctorArgs[i - 1] = arguments[i];
    }
    // This is a constructor. Call the superclass constructor.
    return caller.superClass_.constructor.apply(me, ctorArgs);
  }

  // Copying using loop to avoid deop due to passing arguments object to
  // function. This is faster in many JS engines as of late 2014.
  var args = new Array(arguments.length - 2);
  for (var i = 2; i < arguments.length; i++) {
    args[i - 2] = arguments[i];
  }
  var foundCaller = false;
  for (var ctor = me.constructor; ctor;
       ctor = ctor.superClass_ && ctor.superClass_.constructor) {
    if (ctor.prototype[opt_methodName] === caller) {
      foundCaller = true;
    } else if (foundCaller) {
      return ctor.prototype[opt_methodName].apply(me, args);
    }
  }

  // If we did not find the caller in the prototype chain, then one of two
  // things happened:
  // 1) The caller is an instance method.
  // 2) This method was not called by the right caller.
  if (me[opt_methodName] === caller) {
    return me.constructor.prototype[opt_methodName].apply(me, args);
  } else {
    throw Error(
        'goog.base called from a method of one name ' +
        'to a method of a different name');
  }
};


/**
 * Allow for aliasing within scope functions.  This function exists for
 * uncompiled code - in compiled code the calls will be inlined and the aliases
 * applied.  In uncompiled code the function is simply run since the aliases as
 * written are valid JavaScript.
 *
 *
 * @param {function()} fn Function to call.  This function can contain aliases
 *     to namespaces (e.g. "var dom = goog.dom") or classes
 *     (e.g. "var Timer = goog.Timer").
 */
goog.scope = function(fn) {
  if (goog.isInModuleLoader_()) {
    throw Error('goog.scope is not supported within a goog.module.');
  }
  fn.call(goog.global);
};


/*
 * To support uncompiled, strict mode bundles that use eval to divide source
 * like so:
 *    eval('someSource;//# sourceUrl sourcefile.js');
 * We need to export the globally defined symbols "goog" and "COMPILED".
 * Exporting "goog" breaks the compiler optimizations, so we required that
 * be defined externally.
 * NOTE: We don't use goog.exportSymbol here because we don't want to trigger
 * extern generation when that compiler option is enabled.
 */
if (!COMPILED) {
  goog.global['COMPILED'] = COMPILED;
}


//==============================================================================
// goog.defineClass implementation
//==============================================================================


/**
 * Creates a restricted form of a Closure "class":
 *   - from the compiler's perspective, the instance returned from the
 *     constructor is sealed (no new properties may be added).  This enables
 *     better checks.
 *   - the compiler will rewrite this definition to a form that is optimal
 *     for type checking and optimization (initially this will be a more
 *     traditional form).
 *
 * @param {Function} superClass The superclass, Object or null.
 * @param {goog.defineClass.ClassDescriptor} def
 *     An object literal describing
 *     the class.  It may have the following properties:
 *     "constructor": the constructor function
 *     "statics": an object literal containing methods to add to the constructor
 *        as "static" methods or a function that will receive the constructor
 *        function as its only parameter to which static properties can
 *        be added.
 *     all other properties are added to the prototype.
 * @return {!Function} The class constructor.
 */
goog.defineClass = function(superClass, def) {
  // TODO(johnlenz): consider making the superClass an optional parameter.
  var constructor = def.constructor;
  var statics = def.statics;
  // Wrap the constructor prior to setting up the prototype and static methods.
  if (!constructor || constructor == Object.prototype.constructor) {
    constructor = function() {
      throw Error('cannot instantiate an interface (no constructor defined).');
    };
  }

  var cls = goog.defineClass.createSealingConstructor_(constructor, superClass);
  if (superClass) {
    goog.inherits(cls, superClass);
  }

  // Remove all the properties that should not be copied to the prototype.
  delete def.constructor;
  delete def.statics;

  goog.defineClass.applyProperties_(cls.prototype, def);
  if (statics != null) {
    if (statics instanceof Function) {
      statics(cls);
    } else {
      goog.defineClass.applyProperties_(cls, statics);
    }
  }

  return cls;
};


/**
 * @typedef {{
 *   constructor: (!Function|undefined),
 *   statics: (Object|undefined|function(Function):void)
 * }}
 * @suppress {missingProvide}
 */
goog.defineClass.ClassDescriptor;


/**
 * @define {boolean} Whether the instances returned by goog.defineClass should
 *     be sealed when possible.
 *
 * When sealing is disabled the constructor function will not be wrapped by
 * goog.defineClass, making it incompatible with ES6 class methods.
 */
goog.define('goog.defineClass.SEAL_CLASS_INSTANCES', goog.DEBUG);


/**
 * If goog.defineClass.SEAL_CLASS_INSTANCES is enabled and Object.seal is
 * defined, this function will wrap the constructor in a function that seals the
 * results of the provided constructor function.
 *
 * @param {!Function} ctr The constructor whose results maybe be sealed.
 * @param {Function} superClass The superclass constructor.
 * @return {!Function} The replacement constructor.
 * @private
 */
goog.defineClass.createSealingConstructor_ = function(ctr, superClass) {
  if (!goog.defineClass.SEAL_CLASS_INSTANCES) {
    // Do now wrap the constructor when sealing is disabled. Angular code
    // depends on this for injection to work properly.
    return ctr;
  }

  // Compute whether the constructor is sealable at definition time, rather
  // than when the instance is being constructed.
  var superclassSealable = !goog.defineClass.isUnsealable_(superClass);

  /**
   * @this {Object}
   * @return {?}
   */
  var wrappedCtr = function() {
    // Don't seal an instance of a subclass when it calls the constructor of
    // its super class as there is most likely still setup to do.
    var instance = ctr.apply(this, arguments) || this;
    instance[goog.UID_PROPERTY_] = instance[goog.UID_PROPERTY_];

    if (this.constructor === wrappedCtr && superclassSealable &&
        Object.seal instanceof Function) {
      Object.seal(instance);
    }
    return instance;
  };

  return wrappedCtr;
};


/**
 * @param {Function} ctr The constructor to test.
 * @returns {boolean} Whether the constructor has been tagged as unsealable
 *     using goog.tagUnsealableClass.
 * @private
 */
goog.defineClass.isUnsealable_ = function(ctr) {
  return ctr && ctr.prototype &&
      ctr.prototype[goog.UNSEALABLE_CONSTRUCTOR_PROPERTY_];
};


// TODO(johnlenz): share these values with the goog.object
/**
 * The names of the fields that are defined on Object.prototype.
 * @type {!Array<string>}
 * @private
 * @const
 */
goog.defineClass.OBJECT_PROTOTYPE_FIELDS_ = [
  'constructor', 'hasOwnProperty', 'isPrototypeOf', 'propertyIsEnumerable',
  'toLocaleString', 'toString', 'valueOf'
];


// TODO(johnlenz): share this function with the goog.object
/**
 * @param {!Object} target The object to add properties to.
 * @param {!Object} source The object to copy properties from.
 * @private
 */
goog.defineClass.applyProperties_ = function(target, source) {
  // TODO(johnlenz): update this to support ES5 getters/setters

  var key;
  for (key in source) {
    if (Object.prototype.hasOwnProperty.call(source, key)) {
      target[key] = source[key];
    }
  }

  // For IE the for-in-loop does not contain any properties that are not
  // enumerable on the prototype object (for example isPrototypeOf from
  // Object.prototype) and it will also not include 'replace' on objects that
  // extend String and change 'replace' (not that it is common for anyone to
  // extend anything except Object).
  for (var i = 0; i < goog.defineClass.OBJECT_PROTOTYPE_FIELDS_.length; i++) {
    key = goog.defineClass.OBJECT_PROTOTYPE_FIELDS_[i];
    if (Object.prototype.hasOwnProperty.call(source, key)) {
      target[key] = source[key];
    }
  }
};


/**
 * Sealing classes breaks the older idiom of assigning properties on the
 * prototype rather than in the constructor. As such, goog.defineClass
 * must not seal subclasses of these old-style classes until they are fixed.
 * Until then, this marks a class as "broken", instructing defineClass
 * not to seal subclasses.
 * @param {!Function} ctr The legacy constructor to tag as unsealable.
 */
goog.tagUnsealableClass = function(ctr) {
  if (!COMPILED && goog.defineClass.SEAL_CLASS_INSTANCES) {
    ctr.prototype[goog.UNSEALABLE_CONSTRUCTOR_PROPERTY_] = true;
  }
};


/**
 * Name for unsealable tag property.
 * @const @private {string}
 */
goog.UNSEALABLE_CONSTRUCTOR_PROPERTY_ = 'goog_defineClass_legacy_unsealable';

goog.provide('ol');


/**
 * Constants defined with the define tag cannot be changed in application
 * code, but can be set at compile time.
 * Some reduce the size of the build in advanced compile mode.
 */


/**
 * @define {boolean} Assume touch.  Default is `false`.
 */
ol.ASSUME_TOUCH = false;


/**
 * TODO: rename this to something having to do with tile grids
 * see https://github.com/openlayers/ol3/issues/2076
 * @define {number} Default maximum zoom for default tile grids.
 */
ol.DEFAULT_MAX_ZOOM = 42;


/**
 * @define {number} Default min zoom level for the map view.  Default is `0`.
 */
ol.DEFAULT_MIN_ZOOM = 0;


/**
 * @define {number} Default maximum allowed threshold  (in pixels) for
 *     reprojection triangulation. Default is `0.5`.
 */
ol.DEFAULT_RASTER_REPROJECTION_ERROR_THRESHOLD = 0.5;


/**
 * @define {number} Default tile size.
 */
ol.DEFAULT_TILE_SIZE = 256;


/**
 * @define {string} Default WMS version.
 */
ol.DEFAULT_WMS_VERSION = '1.3.0';


/**
 * @define {number} Hysteresis pixels.
 */
ol.DRAG_BOX_HYSTERESIS_PIXELS = 8;


/**
 * @define {boolean} Enable the Canvas renderer.  Default is `true`. Setting
 *     this to false at compile time in advanced mode removes all code
 *     supporting the Canvas renderer from the build.
 */
ol.ENABLE_CANVAS = true;


/**
 * @define {boolean} Enable the DOM renderer (used as a fallback where Canvas is
 *     not available).  Default is `true`. Setting this to false at compile time
 *     in advanced mode removes all code supporting the DOM renderer from the
 *     build.
 */
ol.ENABLE_DOM = true;


/**
 * @define {boolean} Enable rendering of ol.layer.Image based layers.  Default
 *     is `true`. Setting this to false at compile time in advanced mode removes
 *     all code supporting Image layers from the build.
 */
ol.ENABLE_IMAGE = true;


/**
 * @define {boolean} Enable integration with the Proj4js library.  Default is
 *     `true`.
 */
ol.ENABLE_PROJ4JS = true;


/**
 * @define {boolean} Enable automatic reprojection of raster sources. Default is
 *     `true`.
 */
ol.ENABLE_RASTER_REPROJECTION = true;


/**
 * @define {boolean} Enable rendering of ol.layer.Tile based layers.  Default is
 *     `true`. Setting this to false at compile time in advanced mode removes
 *     all code supporting Tile layers from the build.
 */
ol.ENABLE_TILE = true;


/**
 * @define {boolean} Enable rendering of ol.layer.Vector based layers.  Default
 *     is `true`. Setting this to false at compile time in advanced mode removes
 *     all code supporting Vector layers from the build.
 */
ol.ENABLE_VECTOR = true;


/**
 * @define {boolean} Enable rendering of ol.layer.VectorTile based layers.
 *     Default is `true`. Setting this to false at compile time in advanced mode
 *     removes all code supporting VectorTile layers from the build.
 */
ol.ENABLE_VECTOR_TILE = true;


/**
 * @define {boolean} Enable the WebGL renderer.  Default is `true`. Setting
 *     this to false at compile time in advanced mode removes all code
 *     supporting the WebGL renderer from the build.
 */
ol.ENABLE_WEBGL = true;


/**
 * @define {number} The size in pixels of the first atlas image. Default is
 * `256`.
 */
ol.INITIAL_ATLAS_SIZE = 256;


/**
 * @define {number} The maximum size in pixels of atlas images. Default is
 * `-1`, meaning it is not used (and `ol.WEBGL_MAX_TEXTURE_SIZE` is
 * used instead).
 */
ol.MAX_ATLAS_SIZE = -1;


/**
 * @define {number} Maximum mouse wheel delta.
 */
ol.MOUSEWHEELZOOM_MAXDELTA = 1;


/**
 * @define {number} Mouse wheel timeout duration.
 */
ol.MOUSEWHEELZOOM_TIMEOUT_DURATION = 80;


/**
 * @define {number} Maximum width and/or height extent ratio that determines
 * when the overview map should be zoomed out.
 */
ol.OVERVIEWMAP_MAX_RATIO = 0.75;


/**
 * @define {number} Minimum width and/or height extent ratio that determines
 * when the overview map should be zoomed in.
 */
ol.OVERVIEWMAP_MIN_RATIO = 0.1;


/**
 * @define {number} Maximum number of source tiles for raster reprojection of
 *     a single tile.
 *     If too many source tiles are determined to be loaded to create a single
 *     reprojected tile the browser can become unresponsive or even crash.
 *     This can happen if the developer defines projections improperly and/or
 *     with unlimited extents.
 *     If too many tiles are required, no tiles are loaded and
 *     `ol.Tile.State.ERROR` state is set. Default is `100`.
 */
ol.RASTER_REPROJECTION_MAX_SOURCE_TILES = 100;


/**
 * @define {number} Maximum number of subdivision steps during raster
 *     reprojection triangulation. Prevents high memory usage and large
 *     number of proj4 calls (for certain transformations and areas).
 *     At most `2*(2^this)` triangles are created for each triangulated
 *     extent (tile/image). Default is `10`.
 */
ol.RASTER_REPROJECTION_MAX_SUBDIVISION = 10;


/**
 * @define {number} Maximum allowed size of triangle relative to world width.
 *     When transforming corners of world extent between certain projections,
 *     the resulting triangulation seems to have zero error and no subdivision
 *     is performed.
 *     If the triangle width is more than this (relative to world width; 0-1),
 *     subdivison is forced (up to `ol.RASTER_REPROJECTION_MAX_SUBDIVISION`).
 *     Default is `0.25`.
 */
ol.RASTER_REPROJECTION_MAX_TRIANGLE_WIDTH = 0.25;


/**
 * @define {number} Tolerance for geometry simplification in device pixels.
 */
ol.SIMPLIFY_TOLERANCE = 0.5;


/**
 * @define {number} Texture cache high water mark.
 */
ol.WEBGL_TEXTURE_CACHE_HIGH_WATER_MARK = 1024;


/**
 * @define {string} OpenLayers version.
 */
ol.VERSION = '';


/**
 * The maximum supported WebGL texture size in pixels. If WebGL is not
 * supported, the value is set to `undefined`.
 * @const
 * @type {number|undefined}
 */
ol.WEBGL_MAX_TEXTURE_SIZE; // value is set in `ol.has`


/**
 * List of supported WebGL extensions.
 * @const
 * @type {Array.<string>}
 */
ol.WEBGL_EXTENSIONS; // value is set in `ol.has`


/**
 * Inherit the prototype methods from one constructor into another.
 *
 * Usage:
 *
 *     function ParentClass(a, b) { }
 *     ParentClass.prototype.foo = function(a) { }
 *
 *     function ChildClass(a, b, c) {
 *       // Call parent constructor
 *       ParentClass.call(this, a, b);
 *     }
 *     ol.inherits(ChildClass, ParentClass);
 *
 *     var child = new ChildClass('a', 'b', 'see');
 *     child.foo(); // This works.
 *
 * @param {!Function} childCtor Child constructor.
 * @param {!Function} parentCtor Parent constructor.
 * @function
 * @api
 */
ol.inherits = function(childCtor, parentCtor) {
  childCtor.prototype = Object.create(parentCtor.prototype);
  childCtor.prototype.constructor = childCtor;
};


/**
 * A reusable function, used e.g. as a default for callbacks.
 *
 * @return {undefined} Nothing.
 */
ol.nullFunction = function() {};


/**
 * Gets a unique ID for an object. This mutates the object so that further calls
 * with the same object as a parameter returns the same value. Adapted from
 * goog.getUid.
 *
 * @param {Object} obj The object to get the unique ID for.
 * @return {number} The unique ID for the object.
 */
ol.getUid = function(obj) {
  return obj.ol_uid ||
      (obj.ol_uid = ++ol.uidCounter_);
};


/**
 * Counter for getUid.
 * @type {number}
 * @private
 */
ol.uidCounter_ = 0;


/**
 * @see https://github.com/tc39/proposal-global
 */
if (typeof window !== 'undefined') {
  ol.global = window;
} else if (typeof global !== 'undefined') {
  ol.global = global;
} else if (typeof self !== 'undefined') {
  ol.global = self;
}

goog.provide('ol.AssertionError');

goog.require('ol');

/**
 * Error object thrown when an assertion failed. This is an ECMA-262 Error,
 * extended with a `code` property.
 * @see {@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error}
 * @constructor
 * @extends {Error}
 * @implements {oli.AssertionError}
 * @param {number} code Error code.
 */
ol.AssertionError = function(code) {

  /**
   * @type {string}
   */
  this.message = 'Assertion failed. See ' +
      (ol.VERSION ? 'http://openlayers.org/en/' + ol.VERSION.split('-')[0] : '') +
      '/doc/errors/#' + code + ' for details.';

  /**
   * Error code. The meaning of the code can be found on
   * {@link http://openlayers.org/en/latest/errors.html} (replace `latest` with
   * the version found in the OpenLayers script's header comment if a version
   * other than the latest is used).
   * @type {number}
   * @api
   */
  this.code = code;

  this.name = 'AssertionError';

};
ol.inherits(ol.AssertionError, Error);

goog.provide('ol.asserts');

goog.require('ol');
goog.require('ol.AssertionError');


/**
 * @param {*} assertion Assertion we expected to be truthy.
 * @param {number} errorCode Error code.
 */
ol.asserts.assert = function(assertion, errorCode) {
  if (!assertion) {
    throw new ol.AssertionError(errorCode);
  }
};

goog.provide('ol.math');

goog.require('ol.asserts');


/**
 * Takes a number and clamps it to within the provided bounds.
 * @param {number} value The input number.
 * @param {number} min The minimum value to return.
 * @param {number} max The maximum value to return.
 * @return {number} The input number if it is within bounds, or the nearest
 *     number within the bounds.
 */
ol.math.clamp = function(value, min, max) {
  return Math.min(Math.max(value, min), max);
};


/**
 * Return the hyperbolic cosine of a given number. The method will use the
 * native `Math.cosh` function if it is available, otherwise the hyperbolic
 * cosine will be calculated via the reference implementation of the Mozilla
 * developer network.
 *
 * @param {number} x X.
 * @return {number} Hyperbolic cosine of x.
 */
ol.math.cosh = (function() {
  // Wrapped in a iife, to save the overhead of checking for the native
  // implementation on every invocation.
  var cosh;
  if ('cosh' in Math) {
    // The environment supports the native Math.cosh function, use it…
    cosh = Math.cosh;
  } else {
    // … else, use the reference implementation of MDN:
    cosh = function(x) {
      var y = Math.exp(x);
      return (y + 1 / y) / 2;
    };
  }
  return cosh;
}());


/**
 * @param {number} x X.
 * @return {number} The smallest power of two greater than or equal to x.
 */
ol.math.roundUpToPowerOfTwo = function(x) {
  ol.asserts.assert(0 < x, 29); // `x` must be greater than `0`
  return Math.pow(2, Math.ceil(Math.log(x) / Math.LN2));
};


/**
 * Returns the square of the closest distance between the point (x, y) and the
 * line segment (x1, y1) to (x2, y2).
 * @param {number} x X.
 * @param {number} y Y.
 * @param {number} x1 X1.
 * @param {number} y1 Y1.
 * @param {number} x2 X2.
 * @param {number} y2 Y2.
 * @return {number} Squared distance.
 */
ol.math.squaredSegmentDistance = function(x, y, x1, y1, x2, y2) {
  var dx = x2 - x1;
  var dy = y2 - y1;
  if (dx !== 0 || dy !== 0) {
    var t = ((x - x1) * dx + (y - y1) * dy) / (dx * dx + dy * dy);
    if (t > 1) {
      x1 = x2;
      y1 = y2;
    } else if (t > 0) {
      x1 += dx * t;
      y1 += dy * t;
    }
  }
  return ol.math.squaredDistance(x, y, x1, y1);
};


/**
 * Returns the square of the distance between the points (x1, y1) and (x2, y2).
 * @param {number} x1 X1.
 * @param {number} y1 Y1.
 * @param {number} x2 X2.
 * @param {number} y2 Y2.
 * @return {number} Squared distance.
 */
ol.math.squaredDistance = function(x1, y1, x2, y2) {
  var dx = x2 - x1;
  var dy = y2 - y1;
  return dx * dx + dy * dy;
};


/**
 * Solves system of linear equations using Gaussian elimination method.
 *
 * @param {Array.<Array.<number>>} mat Augmented matrix (n x n + 1 column)
 *                                     in row-major order.
 * @return {Array.<number>} The resulting vector.
 */
ol.math.solveLinearSystem = function(mat) {
  var n = mat.length;

  if (goog.DEBUG) {
    for (var row = 0; row < n; row++) {
      console.assert(mat[row].length == n + 1,
                          'every row should have correct number of columns');
    }
  }

  for (var i = 0; i < n; i++) {
    // Find max in the i-th column (ignoring i - 1 first rows)
    var maxRow = i;
    var maxEl = Math.abs(mat[i][i]);
    for (var r = i + 1; r < n; r++) {
      var absValue = Math.abs(mat[r][i]);
      if (absValue > maxEl) {
        maxEl = absValue;
        maxRow = r;
      }
    }

    if (maxEl === 0) {
      return null; // matrix is singular
    }

    // Swap max row with i-th (current) row
    var tmp = mat[maxRow];
    mat[maxRow] = mat[i];
    mat[i] = tmp;

    // Subtract the i-th row to make all the remaining rows 0 in the i-th column
    for (var j = i + 1; j < n; j++) {
      var coef = -mat[j][i] / mat[i][i];
      for (var k = i; k < n + 1; k++) {
        if (i == k) {
          mat[j][k] = 0;
        } else {
          mat[j][k] += coef * mat[i][k];
        }
      }
    }
  }

  // Solve Ax=b for upper triangular matrix A (mat)
  var x = new Array(n);
  for (var l = n - 1; l >= 0; l--) {
    x[l] = mat[l][n] / mat[l][l];
    for (var m = l - 1; m >= 0; m--) {
      mat[m][n] -= mat[m][l] * x[l];
    }
  }
  return x;
};


/**
 * Converts radians to to degrees.
 *
 * @param {number} angleInRadians Angle in radians.
 * @return {number} Angle in degrees.
 */
ol.math.toDegrees = function(angleInRadians) {
  return angleInRadians * 180 / Math.PI;
};


/**
 * Converts degrees to radians.
 *
 * @param {number} angleInDegrees Angle in degrees.
 * @return {number} Angle in radians.
 */
ol.math.toRadians = function(angleInDegrees) {
  return angleInDegrees * Math.PI / 180;
};

/**
 * Returns the modulo of a / b, depending on the sign of b.
 *
 * @param {number} a Dividend.
 * @param {number} b Divisor.
 * @return {number} Modulo.
 */
ol.math.modulo = function(a, b) {
  var r = a % b;
  return r * b < 0 ? r + b : r;
};

/**
 * Calculates the linearly interpolated value of x between a and b.
 *
 * @param {number} a Number
 * @param {number} b Number
 * @param {number} x Value to be interpolated.
 * @return {number} Interpolated value.
 */
ol.math.lerp = function(a, b, x) {
  return a + x * (b - a);
};

goog.provide('ol.CenterConstraint');

goog.require('ol.math');


/**
 * @param {ol.Extent} extent Extent.
 * @return {ol.CenterConstraintType} The constraint.
 */
ol.CenterConstraint.createExtent = function(extent) {
  return (
      /**
       * @param {ol.Coordinate|undefined} center Center.
       * @return {ol.Coordinate|undefined} Center.
       */
      function(center) {
        if (center) {
          return [
            ol.math.clamp(center[0], extent[0], extent[2]),
            ol.math.clamp(center[1], extent[1], extent[3])
          ];
        } else {
          return undefined;
        }
      });
};


/**
 * @param {ol.Coordinate|undefined} center Center.
 * @return {ol.Coordinate|undefined} Center.
 */
ol.CenterConstraint.none = function(center) {
  return center;
};

goog.provide('ol.Constraints');


/**
 * @constructor
 * @param {ol.CenterConstraintType} centerConstraint Center constraint.
 * @param {ol.ResolutionConstraintType} resolutionConstraint
 *     Resolution constraint.
 * @param {ol.RotationConstraintType} rotationConstraint
 *     Rotation constraint.
 */
ol.Constraints = function(centerConstraint, resolutionConstraint, rotationConstraint) {

  /**
   * @type {ol.CenterConstraintType}
   */
  this.center = centerConstraint;

  /**
   * @type {ol.ResolutionConstraintType}
   */
  this.resolution = resolutionConstraint;

  /**
   * @type {ol.RotationConstraintType}
   */
  this.rotation = rotationConstraint;

};

goog.provide('ol.obj');


/**
 * Polyfill for Object.assign().  Assigns enumerable and own properties from
 * one or more source objects to a target object.
 *
 * @see https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Object/assign
 * @param {!Object} target The target object.
 * @param {...Object} var_sources The source object(s).
 * @return {!Object} The modified target object.
 */
ol.obj.assign = (typeof Object.assign === 'function') ? Object.assign : function(target, var_sources) {
  if (target === undefined || target === null) {
    throw new TypeError('Cannot convert undefined or null to object');
  }

  var output = Object(target);
  for (var i = 1, ii = arguments.length; i < ii; ++i) {
    var source = arguments[i];
    if (source !== undefined && source !== null) {
      for (var key in source) {
        if (source.hasOwnProperty(key)) {
          output[key] = source[key];
        }
      }
    }
  }
  return output;
};


/**
 * Removes all properties from an object.
 * @param {Object} object The object to clear.
 */
ol.obj.clear = function(object) {
  for (var property in object) {
    delete object[property];
  }
};


/**
 * Get an array of property values from an object.
 * @param {Object<K,V>} object The object from which to get the values.
 * @return {!Array<V>} The property values.
 * @template K,V
 */
ol.obj.getValues = function(object) {
  var values = [];
  for (var property in object) {
    values.push(object[property]);
  }
  return values;
};


/**
 * Determine if an object has any properties.
 * @param {Object} object The object to check.
 * @return {boolean} The object is empty.
 */
ol.obj.isEmpty = function(object) {
  var property;
  for (property in object) {
    return false;
  }
  return !property;
};

goog.provide('ol.events');

goog.require('ol.obj');


/**
 * @param {ol.EventsKey} listenerObj Listener object.
 * @return {ol.EventsListenerFunctionType} Bound listener.
 */
ol.events.bindListener_ = function(listenerObj) {
  var boundListener = function(evt) {
    var listener = listenerObj.listener;
    var bindTo = listenerObj.bindTo || listenerObj.target;
    if (listenerObj.callOnce) {
      ol.events.unlistenByKey(listenerObj);
    }
    return listener.call(bindTo, evt);
  };
  listenerObj.boundListener = boundListener;
  return boundListener;
};


/**
 * Finds the matching {@link ol.EventsKey} in the given listener
 * array.
 *
 * @param {!Array<!ol.EventsKey>} listeners Array of listeners.
 * @param {!Function} listener The listener function.
 * @param {Object=} opt_this The `this` value inside the listener.
 * @param {boolean=} opt_setDeleteIndex Set the deleteIndex on the matching
 *     listener, for {@link ol.events.unlistenByKey}.
 * @return {ol.EventsKey|undefined} The matching listener object.
 * @private
 */
ol.events.findListener_ = function(listeners, listener, opt_this,
    opt_setDeleteIndex) {
  var listenerObj;
  for (var i = 0, ii = listeners.length; i < ii; ++i) {
    listenerObj = listeners[i];
    if (listenerObj.listener === listener &&
        listenerObj.bindTo === opt_this) {
      if (opt_setDeleteIndex) {
        listenerObj.deleteIndex = i;
      }
      return listenerObj;
    }
  }
  return undefined;
};


/**
 * @param {ol.EventTargetLike} target Target.
 * @param {string} type Type.
 * @return {Array.<ol.EventsKey>|undefined} Listeners.
 */
ol.events.getListeners = function(target, type) {
  var listenerMap = target.ol_lm;
  return listenerMap ? listenerMap[type] : undefined;
};


/**
 * Get the lookup of listeners.  If one does not exist on the target, it is
 * created.
 * @param {ol.EventTargetLike} target Target.
 * @return {!Object.<string, Array.<ol.EventsKey>>} Map of
 *     listeners by event type.
 * @private
 */
ol.events.getListenerMap_ = function(target) {
  var listenerMap = target.ol_lm;
  if (!listenerMap) {
    listenerMap = target.ol_lm = {};
  }
  return listenerMap;
};


/**
 * Clean up all listener objects of the given type.  All properties on the
 * listener objects will be removed, and if no listeners remain in the listener
 * map, it will be removed from the target.
 * @param {ol.EventTargetLike} target Target.
 * @param {string} type Type.
 * @private
 */
ol.events.removeListeners_ = function(target, type) {
  var listeners = ol.events.getListeners(target, type);
  if (listeners) {
    for (var i = 0, ii = listeners.length; i < ii; ++i) {
      target.removeEventListener(type, listeners[i].boundListener);
      ol.obj.clear(listeners[i]);
    }
    listeners.length = 0;
    var listenerMap = target.ol_lm;
    if (listenerMap) {
      delete listenerMap[type];
      if (Object.keys(listenerMap).length === 0) {
        delete target.ol_lm;
      }
    }
  }
};


/**
 * Registers an event listener on an event target. Inspired by
 * {@link https://google.github.io/closure-library/api/source/closure/goog/events/events.js.src.html}
 *
 * This function efficiently binds a `listener` to a `this` object, and returns
 * a key for use with {@link ol.events.unlistenByKey}.
 *
 * @param {ol.EventTargetLike} target Event target.
 * @param {string} type Event type.
 * @param {ol.EventsListenerFunctionType} listener Listener.
 * @param {Object=} opt_this Object referenced by the `this` keyword in the
 *     listener. Default is the `target`.
 * @param {boolean=} opt_once If true, add the listener as one-off listener.
 * @return {ol.EventsKey} Unique key for the listener.
 */
ol.events.listen = function(target, type, listener, opt_this, opt_once) {
  var listenerMap = ol.events.getListenerMap_(target);
  var listeners = listenerMap[type];
  if (!listeners) {
    listeners = listenerMap[type] = [];
  }
  var listenerObj = ol.events.findListener_(listeners, listener, opt_this,
      false);
  if (listenerObj) {
    if (!opt_once) {
      // Turn one-off listener into a permanent one.
      listenerObj.callOnce = false;
    }
  } else {
    listenerObj = /** @type {ol.EventsKey} */ ({
      bindTo: opt_this,
      callOnce: !!opt_once,
      listener: listener,
      target: target,
      type: type
    });
    target.addEventListener(type, ol.events.bindListener_(listenerObj));
    listeners.push(listenerObj);
  }

  return listenerObj;
};


/**
 * Registers a one-off event listener on an event target. Inspired by
 * {@link https://google.github.io/closure-library/api/source/closure/goog/events/events.js.src.html}
 *
 * This function efficiently binds a `listener` as self-unregistering listener
 * to a `this` object, and returns a key for use with
 * {@link ol.events.unlistenByKey} in case the listener needs to be unregistered
 * before it is called.
 *
 * When {@link ol.events.listen} is called with the same arguments after this
 * function, the self-unregistering listener will be turned into a permanent
 * listener.
 *
 * @param {ol.EventTargetLike} target Event target.
 * @param {string} type Event type.
 * @param {ol.EventsListenerFunctionType} listener Listener.
 * @param {Object=} opt_this Object referenced by the `this` keyword in the
 *     listener. Default is the `target`.
 * @return {ol.EventsKey} Key for unlistenByKey.
 */
ol.events.listenOnce = function(target, type, listener, opt_this) {
  return ol.events.listen(target, type, listener, opt_this, true);
};


/**
 * Unregisters an event listener on an event target. Inspired by
 * {@link https://google.github.io/closure-library/api/source/closure/goog/events/events.js.src.html}
 *
 * To return a listener, this function needs to be called with the exact same
 * arguments that were used for a previous {@link ol.events.listen} call.
 *
 * @param {ol.EventTargetLike} target Event target.
 * @param {string} type Event type.
 * @param {ol.EventsListenerFunctionType} listener Listener.
 * @param {Object=} opt_this Object referenced by the `this` keyword in the
 *     listener. Default is the `target`.
 */
ol.events.unlisten = function(target, type, listener, opt_this) {
  var listeners = ol.events.getListeners(target, type);
  if (listeners) {
    var listenerObj = ol.events.findListener_(listeners, listener, opt_this,
        true);
    if (listenerObj) {
      ol.events.unlistenByKey(listenerObj);
    }
  }
};


/**
 * Unregisters event listeners on an event target. Inspired by
 * {@link https://google.github.io/closure-library/api/source/closure/goog/events/events.js.src.html}
 *
 * The argument passed to this function is the key returned from
 * {@link ol.events.listen} or {@link ol.events.listenOnce}.
 *
 * @param {ol.EventsKey} key The key.
 */
ol.events.unlistenByKey = function(key) {
  if (key && key.target) {
    key.target.removeEventListener(key.type, key.boundListener);
    var listeners = ol.events.getListeners(key.target, key.type);
    if (listeners) {
      var i = 'deleteIndex' in key ? key.deleteIndex : listeners.indexOf(key);
      if (i !== -1) {
        listeners.splice(i, 1);
      }
      if (listeners.length === 0) {
        ol.events.removeListeners_(key.target, key.type);
      }
    }
    ol.obj.clear(key);
  }
};


/**
 * Unregisters all event listeners on an event target. Inspired by
 * {@link https://google.github.io/closure-library/api/source/closure/goog/events/events.js.src.html}
 *
 * @param {ol.EventTargetLike} target Target.
 */
ol.events.unlistenAll = function(target) {
  var listenerMap = ol.events.getListenerMap_(target);
  for (var type in listenerMap) {
    ol.events.removeListeners_(target, type);
  }
};

goog.provide('ol.Disposable');

goog.require('ol');

/**
 * Objects that need to clean up after themselves.
 * @constructor
 */
ol.Disposable = function() {};

/**
 * The object has already been disposed.
 * @type {boolean}
 * @private
 */
ol.Disposable.prototype.disposed_ = false;

/**
 * Clean up.
 */
ol.Disposable.prototype.dispose = function() {
  if (!this.disposed_) {
    this.disposed_ = true;
    this.disposeInternal();
  }
};

/**
 * Extension point for disposable objects.
 * @protected
 */
ol.Disposable.prototype.disposeInternal = ol.nullFunction;

goog.provide('ol.events.Event');


/**
 * @classdesc
 * Stripped down implementation of the W3C DOM Level 2 Event interface.
 * @see {@link https://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-interface}
 *
 * This implementation only provides `type` and `target` properties, and
 * `stopPropagation` and `preventDefault` methods. It is meant as base class
 * for higher level events defined in the library, and works with
 * {@link ol.events.EventTarget}.
 *
 * @constructor
 * @implements {oli.events.Event}
 * @param {string} type Type.
 */
ol.events.Event = function(type) {

  /**
   * @type {boolean}
   */
  this.propagationStopped;

  /**
   * The event type.
   * @type {string}
   * @api stable
   */
  this.type = type;

  /**
   * The event target.
   * @type {Object}
   * @api stable
   */
  this.target = null;

};


/**
 * Stop event propagation.
 * @function
 * @api stable
 */
ol.events.Event.prototype.preventDefault =

/**
 * Stop event propagation.
 * @function
 * @api stable
 */
ol.events.Event.prototype.stopPropagation = function() {
  this.propagationStopped = true;
};


/**
 * @param {Event|ol.events.Event} evt Event
 */
ol.events.Event.stopPropagation = function(evt) {
  evt.stopPropagation();
};


/**
 * @param {Event|ol.events.Event} evt Event
 */
ol.events.Event.preventDefault = function(evt) {
  evt.preventDefault();
};

goog.provide('ol.events.EventTarget');

goog.require('ol');
goog.require('ol.Disposable');
goog.require('ol.events');
goog.require('ol.events.Event');


/**
 * @classdesc
 * A simplified implementation of the W3C DOM Level 2 EventTarget interface.
 * @see {@link https://www.w3.org/TR/2000/REC-DOM-Level-2-Events-20001113/events.html#Events-EventTarget}
 *
 * There are two important simplifications compared to the specification:
 *
 * 1. The handling of `useCapture` in `addEventListener` and
 *    `removeEventListener`. There is no real capture model.
 * 2. The handling of `stopPropagation` and `preventDefault` on `dispatchEvent`.
 *    There is no event target hierarchy. When a listener calls
 *    `stopPropagation` or `preventDefault` on an event object, it means that no
 *    more listeners after this one will be called. Same as when the listener
 *    returns false.
 *
 * @constructor
 * @extends {ol.Disposable}
 */
ol.events.EventTarget = function() {

  ol.Disposable.call(this);

  /**
   * @private
   * @type {!Object.<string, number>}
   */
  this.pendingRemovals_ = {};

  /**
   * @private
   * @type {!Object.<string, number>}
   */
  this.dispatching_ = {};

  /**
   * @private
   * @type {!Object.<string, Array.<ol.EventsListenerFunctionType>>}
   */
  this.listeners_ = {};

};
ol.inherits(ol.events.EventTarget, ol.Disposable);


/**
 * @param {string} type Type.
 * @param {ol.EventsListenerFunctionType} listener Listener.
 */
ol.events.EventTarget.prototype.addEventListener = function(type, listener) {
  var listeners = this.listeners_[type];
  if (!listeners) {
    listeners = this.listeners_[type] = [];
  }
  if (listeners.indexOf(listener) === -1) {
    listeners.push(listener);
  }
};


/**
 * @param {{type: string,
 *     target: (EventTarget|ol.events.EventTarget|undefined)}|ol.events.Event|
 *     string} event Event or event type.
 * @return {boolean|undefined} `false` if anyone called preventDefault on the
 *     event object or if any of the listeners returned false.
 */
ol.events.EventTarget.prototype.dispatchEvent = function(event) {
  var evt = typeof event === 'string' ? new ol.events.Event(event) : event;
  var type = evt.type;
  evt.target = this;
  var listeners = this.listeners_[type];
  var propagate;
  if (listeners) {
    if (!(type in this.dispatching_)) {
      this.dispatching_[type] = 0;
      this.pendingRemovals_[type] = 0;
    }
    ++this.dispatching_[type];
    for (var i = 0, ii = listeners.length; i < ii; ++i) {
      if (listeners[i].call(this, evt) === false || evt.propagationStopped) {
        propagate = false;
        break;
      }
    }
    --this.dispatching_[type];
    if (this.dispatching_[type] === 0) {
      var pendingRemovals = this.pendingRemovals_[type];
      delete this.pendingRemovals_[type];
      while (pendingRemovals--) {
        this.removeEventListener(type, ol.nullFunction);
      }
      delete this.dispatching_[type];
    }
    return propagate;
  }
};


/**
 * @inheritDoc
 */
ol.events.EventTarget.prototype.disposeInternal = function() {
  ol.events.unlistenAll(this);
};


/**
 * Get the listeners for a specified event type. Listeners are returned in the
 * order that they will be called in.
 *
 * @param {string} type Type.
 * @return {Array.<ol.EventsListenerFunctionType>} Listeners.
 */
ol.events.EventTarget.prototype.getListeners = function(type) {
  return this.listeners_[type];
};


/**
 * @param {string=} opt_type Type. If not provided,
 *     `true` will be returned if this EventTarget has any listeners.
 * @return {boolean} Has listeners.
 */
ol.events.EventTarget.prototype.hasListener = function(opt_type) {
  return opt_type ?
      opt_type in this.listeners_ :
      Object.keys(this.listeners_).length > 0;
};


/**
 * @param {string} type Type.
 * @param {ol.EventsListenerFunctionType} listener Listener.
 */
ol.events.EventTarget.prototype.removeEventListener = function(type, listener) {
  var listeners = this.listeners_[type];
  if (listeners) {
    var index = listeners.indexOf(listener);
    goog.DEBUG && console.assert(index != -1, 'listener not found');
    if (type in this.pendingRemovals_) {
      // make listener a no-op, and remove later in #dispatchEvent()
      listeners[index] = ol.nullFunction;
      ++this.pendingRemovals_[type];
    } else {
      listeners.splice(index, 1);
      if (listeners.length === 0) {
        delete this.listeners_[type];
      }
    }
  }
};

goog.provide('ol.events.EventType');

/**
 * @enum {string}
 * @const
 */
ol.events.EventType = {
  /**
   * Generic change event. Triggered when the revision counter is increased.
   * @event ol.events.Event#change
   * @api
   */
  CHANGE: 'change',

  CLICK: 'click',
  DBLCLICK: 'dblclick',
  DRAGENTER: 'dragenter',
  DRAGOVER: 'dragover',
  DROP: 'drop',
  ERROR: 'error',
  KEYDOWN: 'keydown',
  KEYPRESS: 'keypress',
  LOAD: 'load',
  MOUSEDOWN: 'mousedown',
  MOUSEMOVE: 'mousemove',
  MOUSEOUT: 'mouseout',
  MOUSEUP: 'mouseup',
  MOUSEWHEEL: 'mousewheel',
  MSPOINTERDOWN: 'mspointerdown',
  RESIZE: 'resize',
  TOUCHSTART: 'touchstart',
  TOUCHMOVE: 'touchmove',
  TOUCHEND: 'touchend',
  WHEEL: 'wheel'
};

goog.provide('ol.Observable');

goog.require('ol');
goog.require('ol.events');
goog.require('ol.events.EventTarget');
goog.require('ol.events.EventType');


/**
 * @classdesc
 * Abstract base class; normally only used for creating subclasses and not
 * instantiated in apps.
 * An event target providing convenient methods for listener registration
 * and unregistration. A generic `change` event is always available through
 * {@link ol.Observable#changed}.
 *
 * @constructor
 * @extends {ol.events.EventTarget}
 * @fires ol.events.Event
 * @struct
 * @api stable
 */
ol.Observable = function() {

  ol.events.EventTarget.call(this);

  /**
   * @private
   * @type {number}
   */
  this.revision_ = 0;

};
ol.inherits(ol.Observable, ol.events.EventTarget);


/**
 * Removes an event listener using the key returned by `on()` or `once()`.
 * @param {ol.EventsKey|Array.<ol.EventsKey>} key The key returned by `on()`
 *     or `once()` (or an array of keys).
 * @api stable
 */
ol.Observable.unByKey = function(key) {
  if (Array.isArray(key)) {
    for (var i = 0, ii = key.length; i < ii; ++i) {
      ol.events.unlistenByKey(key[i]);
    }
  } else {
    ol.events.unlistenByKey(/** @type {ol.EventsKey} */ (key));
  }
};


/**
 * Increases the revision counter and dispatches a 'change' event.
 * @api
 */
ol.Observable.prototype.changed = function() {
  ++this.revision_;
  this.dispatchEvent(ol.events.EventType.CHANGE);
};


/**
 * Dispatches an event and calls all listeners listening for events
 * of this type. The event parameter can either be a string or an
 * Object with a `type` property.
 *
 * @param {{type: string,
 *     target: (EventTarget|ol.events.EventTarget|undefined)}|ol.events.Event|
 *     string} event Event object.
 * @function
 * @api
 */
ol.Observable.prototype.dispatchEvent;


/**
 * Get the version number for this object.  Each time the object is modified,
 * its version number will be incremented.
 * @return {number} Revision.
 * @api
 */
ol.Observable.prototype.getRevision = function() {
  return this.revision_;
};


/**
 * Listen for a certain type of event.
 * @param {string|Array.<string>} type The event type or array of event types.
 * @param {function(?): ?} listener The listener function.
 * @param {Object=} opt_this The object to use as `this` in `listener`.
 * @return {ol.EventsKey|Array.<ol.EventsKey>} Unique key for the listener. If
 *     called with an array of event types as the first argument, the return
 *     will be an array of keys.
 * @api stable
 */
ol.Observable.prototype.on = function(type, listener, opt_this) {
  if (Array.isArray(type)) {
    var len = type.length;
    var keys = new Array(len);
    for (var i = 0; i < len; ++i) {
      keys[i] = ol.events.listen(this, type[i], listener, opt_this);
    }
    return keys;
  } else {
    return ol.events.listen(
        this, /** @type {string} */ (type), listener, opt_this);
  }
};


/**
 * Listen once for a certain type of event.
 * @param {string|Array.<string>} type The event type or array of event types.
 * @param {function(?): ?} listener The listener function.
 * @param {Object=} opt_this The object to use as `this` in `listener`.
 * @return {ol.EventsKey|Array.<ol.EventsKey>} Unique key for the listener. If
 *     called with an array of event types as the first argument, the return
 *     will be an array of keys.
 * @api stable
 */
ol.Observable.prototype.once = function(type, listener, opt_this) {
  if (Array.isArray(type)) {
    var len = type.length;
    var keys = new Array(len);
    for (var i = 0; i < len; ++i) {
      keys[i] = ol.events.listenOnce(this, type[i], listener, opt_this);
    }
    return keys;
  } else {
    return ol.events.listenOnce(
        this, /** @type {string} */ (type), listener, opt_this);
  }
};


/**
 * Unlisten for a certain type of event.
 * @param {string|Array.<string>} type The event type or array of event types.
 * @param {function(?): ?} listener The listener function.
 * @param {Object=} opt_this The object which was used as `this` by the
 * `listener`.
 * @api stable
 */
ol.Observable.prototype.un = function(type, listener, opt_this) {
  if (Array.isArray(type)) {
    for (var i = 0, ii = type.length; i < ii; ++i) {
      ol.events.unlisten(this, type[i], listener, opt_this);
    }
    return;
  } else {
    ol.events.unlisten(this, /** @type {string} */ (type), listener, opt_this);
  }
};


/**
 * Removes an event listener using the key returned by `on()` or `once()`.
 * Note that using the {@link ol.Observable.unByKey} static function is to
 * be preferred.
 * @param {ol.EventsKey|Array.<ol.EventsKey>} key The key returned by `on()`
 *     or `once()` (or an array of keys).
 * @function
 * @api stable
 */
ol.Observable.prototype.unByKey = ol.Observable.unByKey;

goog.provide('ol.Object');
goog.provide('ol.ObjectEvent');
goog.provide('ol.ObjectEventType');

goog.require('ol');
goog.require('ol.Observable');
goog.require('ol.events.Event');
goog.require('ol.obj');


/**
 * @enum {string}
 */
ol.ObjectEventType = {
  /**
   * Triggered when a property is changed.
   * @event ol.ObjectEvent#propertychange
   * @api stable
   */
  PROPERTYCHANGE: 'propertychange'
};


/**
 * @classdesc
 * Events emitted by {@link ol.Object} instances are instances of this type.
 *
 * @param {string} type The event type.
 * @param {string} key The property name.
 * @param {*} oldValue The old value for `key`.
 * @extends {ol.events.Event}
 * @implements {oli.ObjectEvent}
 * @constructor
 */
ol.ObjectEvent = function(type, key, oldValue) {
  ol.events.Event.call(this, type);

  /**
   * The name of the property whose value is changing.
   * @type {string}
   * @api stable
   */
  this.key = key;

  /**
   * The old value. To get the new value use `e.target.get(e.key)` where
   * `e` is the event object.
   * @type {*}
   * @api stable
   */
  this.oldValue = oldValue;

};
ol.inherits(ol.ObjectEvent, ol.events.Event);


/**
 * @classdesc
 * Abstract base class; normally only used for creating subclasses and not
 * instantiated in apps.
 * Most non-trivial classes inherit from this.
 *
 * This extends {@link ol.Observable} with observable properties, where each
 * property is observable as well as the object as a whole.
 *
 * Classes that inherit from this have pre-defined properties, to which you can
 * add your owns. The pre-defined properties are listed in this documentation as
 * 'Observable Properties', and have their own accessors; for example,
 * {@link ol.Map} has a `target` property, accessed with `getTarget()`  and
 * changed with `setTarget()`. Not all properties are however settable. There
 * are also general-purpose accessors `get()` and `set()`. For example,
 * `get('target')` is equivalent to `getTarget()`.
 *
 * The `set` accessors trigger a change event, and you can monitor this by
 * registering a listener. For example, {@link ol.View} has a `center`
 * property, so `view.on('change:center', function(evt) {...});` would call the
 * function whenever the value of the center property changes. Within the
 * function, `evt.target` would be the view, so `evt.target.getCenter()` would
 * return the new center.
 *
 * You can add your own observable properties with
 * `object.set('prop', 'value')`, and retrieve that with `object.get('prop')`.
 * You can listen for changes on that property value with
 * `object.on('change:prop', listener)`. You can get a list of all
 * properties with {@link ol.Object#getProperties object.getProperties()}.
 *
 * Note that the observable properties are separate from standard JS properties.
 * You can, for example, give your map object a title with
 * `map.title='New title'` and with `map.set('title', 'Another title')`. The
 * first will be a `hasOwnProperty`; the second will appear in
 * `getProperties()`. Only the second is observable.
 *
 * Properties can be deleted by using the unset method. E.g.
 * object.unset('foo').
 *
 * @constructor
 * @extends {ol.Observable}
 * @param {Object.<string, *>=} opt_values An object with key-value pairs.
 * @fires ol.ObjectEvent
 * @api
 */
ol.Object = function(opt_values) {
  ol.Observable.call(this);

  // Call ol.getUid to ensure that the order of objects' ids is the same as
  // the order in which they were created.  This also helps to ensure that
  // object properties are always added in the same order, which helps many
  // JavaScript engines generate faster code.
  ol.getUid(this);

  /**
   * @private
   * @type {!Object.<string, *>}
   */
  this.values_ = {};

  if (opt_values !== undefined) {
    this.setProperties(opt_values);
  }
};
ol.inherits(ol.Object, ol.Observable);


/**
 * @private
 * @type {Object.<string, string>}
 */
ol.Object.changeEventTypeCache_ = {};


/**
 * @param {string} key Key name.
 * @return {string} Change name.
 */
ol.Object.getChangeEventType = function(key) {
  return ol.Object.changeEventTypeCache_.hasOwnProperty(key) ?
      ol.Object.changeEventTypeCache_[key] :
      (ol.Object.changeEventTypeCache_[key] = 'change:' + key);
};


/**
 * Gets a value.
 * @param {string} key Key name.
 * @return {*} Value.
 * @api stable
 */
ol.Object.prototype.get = function(key) {
  var value;
  if (this.values_.hasOwnProperty(key)) {
    value = this.values_[key];
  }
  return value;
};


/**
 * Get a list of object property names.
 * @return {Array.<string>} List of property names.
 * @api stable
 */
ol.Object.prototype.getKeys = function() {
  return Object.keys(this.values_);
};


/**
 * Get an object of all property names and values.
 * @return {Object.<string, *>} Object.
 * @api stable
 */
ol.Object.prototype.getProperties = function() {
  return ol.obj.assign({}, this.values_);
};


/**
 * @param {string} key Key name.
 * @param {*} oldValue Old value.
 */
ol.Object.prototype.notify = function(key, oldValue) {
  var eventType;
  eventType = ol.Object.getChangeEventType(key);
  this.dispatchEvent(new ol.ObjectEvent(eventType, key, oldValue));
  eventType = ol.ObjectEventType.PROPERTYCHANGE;
  this.dispatchEvent(new ol.ObjectEvent(eventType, key, oldValue));
};


/**
 * Sets a value.
 * @param {string} key Key name.
 * @param {*} value Value.
 * @param {boolean=} opt_silent Update without triggering an event.
 * @api stable
 */
ol.Object.prototype.set = function(key, value, opt_silent) {
  if (opt_silent) {
    this.values_[key] = value;
  } else {
    var oldValue = this.values_[key];
    this.values_[key] = value;
    if (oldValue !== value) {
      this.notify(key, oldValue);
    }
  }
};


/**
 * Sets a collection of key-value pairs.  Note that this changes any existing
 * properties and adds new ones (it does not remove any existing properties).
 * @param {Object.<string, *>} values Values.
 * @param {boolean=} opt_silent Update without triggering an event.
 * @api stable
 */
ol.Object.prototype.setProperties = function(values, opt_silent) {
  var key;
  for (key in values) {
    this.set(key, values[key], opt_silent);
  }
};


/**
 * Unsets a property.
 * @param {string} key Key name.
 * @param {boolean=} opt_silent Unset without triggering an event.
 * @api stable
 */
ol.Object.prototype.unset = function(key, opt_silent) {
  if (key in this.values_) {
    var oldValue = this.values_[key];
    delete this.values_[key];
    if (!opt_silent) {
      this.notify(key, oldValue);
    }
  }
};

goog.provide('ol.array');


/**
 * Performs a binary search on the provided sorted list and returns the index of the item if found. If it can't be found it'll return -1.
 * https://github.com/darkskyapp/binary-search
 *
 * @param {Array.<*>} haystack Items to search through.
 * @param {*} needle The item to look for.
 * @param {Function=} opt_comparator Comparator function.
 * @return {number} The index of the item if found, -1 if not.
 */
ol.array.binarySearch = function(haystack, needle, opt_comparator) {
  var mid, cmp;
  var comparator = opt_comparator || ol.array.numberSafeCompareFunction;
  var low = 0;
  var high = haystack.length;
  var found = false;

  while (low < high) {
    /* Note that "(low + high) >>> 1" may overflow, and results in a typecast
     * to double (which gives the wrong results). */
    mid = low + (high - low >> 1);
    cmp = +comparator(haystack[mid], needle);

    if (cmp < 0.0) { /* Too low. */
      low  = mid + 1;

    } else { /* Key found or too high */
      high = mid;
      found = !cmp;
    }
  }

  /* Key not found. */
  return found ? low : ~low;
};

/**
 * @param {Array.<number>} arr Array.
 * @param {number} target Target.
 * @return {number} Index.
 */
ol.array.binaryFindNearest = function(arr, target) {
  var index = ol.array.binarySearch(arr, target,
      /**
       * @param {number} a A.
       * @param {number} b B.
       * @return {number} b minus a.
       */
      function(a, b) {
        return b - a;
      });
  if (index >= 0) {
    return index;
  } else if (index == -1) {
    return 0;
  } else if (index == -arr.length - 1) {
    return arr.length - 1;
  } else {
    var left = -index - 2;
    var right = -index - 1;
    if (arr[left] - target < target - arr[right]) {
      return left;
    } else {
      return right;
    }
  }
};


/**
 * Compare function for array sort that is safe for numbers.
 * @param {*} a The first object to be compared.
 * @param {*} b The second object to be compared.
 * @return {number} A negative number, zero, or a positive number as the first
 *     argument is less than, equal to, or greater than the second.
 */
ol.array.numberSafeCompareFunction = function(a, b) {
  return a > b ? 1 : a < b ? -1 : 0;
};


/**
 * Whether the array contains the given object.
 * @param {Array.<*>} arr The array to test for the presence of the element.
 * @param {*} obj The object for which to test.
 * @return {boolean} The object is in the array.
 */
ol.array.includes = function(arr, obj) {
  return arr.indexOf(obj) >= 0;
};


/**
 * @param {Array.<number>} arr Array.
 * @param {number} target Target.
 * @param {number} direction 0 means return the nearest, > 0
 *    means return the largest nearest, < 0 means return the
 *    smallest nearest.
 * @return {number} Index.
 */
ol.array.linearFindNearest = function(arr, target, direction) {
  var n = arr.length;
  if (arr[0] <= target) {
    return 0;
  } else if (target <= arr[n - 1]) {
    return n - 1;
  } else {
    var i;
    if (direction > 0) {
      for (i = 1; i < n; ++i) {
        if (arr[i] < target) {
          return i - 1;
        }
      }
    } else if (direction < 0) {
      for (i = 1; i < n; ++i) {
        if (arr[i] <= target) {
          return i;
        }
      }
    } else {
      for (i = 1; i < n; ++i) {
        if (arr[i] == target) {
          return i;
        } else if (arr[i] < target) {
          if (arr[i - 1] - target < target - arr[i]) {
            return i - 1;
          } else {
            return i;
          }
        }
      }
    }
    return n - 1;
  }
};


/**
 * @param {Array.<*>} arr Array.
 * @param {number} begin Begin index.
 * @param {number} end End index.
 */
ol.array.reverseSubArray = function(arr, begin, end) {
  goog.DEBUG && console.assert(begin >= 0,
      'Array begin index should be equal to or greater than 0');
  goog.DEBUG && console.assert(end < arr.length,
      'Array end index should be less than the array length');
  while (begin < end) {
    var tmp = arr[begin];
    arr[begin] = arr[end];
    arr[end] = tmp;
    ++begin;
    --end;
  }
};


/**
 * @param {Array.<*>} arr Array.
 * @return {!Array.<?>} Flattened Array.
 */
ol.array.flatten = function(arr) {
  var data = arr.reduce(function(flattened, value) {
    if (Array.isArray(value)) {
      return flattened.concat(ol.array.flatten(value));
    } else {
      return flattened.concat(value);
    }
  }, []);
  return data;
};


/**
 * @param {Array.<VALUE>} arr The array to modify.
 * @param {Array.<VALUE>|VALUE} data The elements or arrays of elements
 *     to add to arr.
 * @template VALUE
 */
ol.array.extend = function(arr, data) {
  var i;
  var extension = Array.isArray(data) ? data : [data];
  var length = extension.length;
  for (i = 0; i < length; i++) {
    arr[arr.length] = extension[i];
  }
};


/**
 * @param {Array.<VALUE>} arr The array to modify.
 * @param {VALUE} obj The element to remove.
 * @template VALUE
 * @return {boolean} If the element was removed.
 */
ol.array.remove = function(arr, obj) {
  var i = arr.indexOf(obj);
  var found = i > -1;
  if (found) {
    arr.splice(i, 1);
  }
  return found;
};


/**
 * @param {Array.<VALUE>} arr The array to search in.
 * @param {function(VALUE, number, ?) : boolean} func The function to compare.
 * @template VALUE
 * @return {VALUE} The element found.
 */
ol.array.find = function(arr, func) {
  var length = arr.length >>> 0;
  var value;

  for (var i = 0; i < length; i++) {
    value = arr[i];
    if (func(value, i, arr)) {
      return value;
    }
  }
  return null;
};


/**
 * @param {Array|Uint8ClampedArray} arr1 The first array to compare.
 * @param {Array|Uint8ClampedArray} arr2 The second array to compare.
 * @return {boolean} Whether the two arrays are equal.
 */
ol.array.equals = function(arr1, arr2) {
  var len1 = arr1.length;
  if (len1 !== arr2.length) {
    return false;
  }
  for (var i = 0; i < len1; i++) {
    if (arr1[i] !== arr2[i]) {
      return false;
    }
  }
  return true;
};


/**
 * @param {Array.<*>} arr The array to sort (modifies original).
 * @param {Function} compareFnc Comparison function.
 */
ol.array.stableSort = function(arr, compareFnc) {
  var length = arr.length;
  var tmp = Array(arr.length);
  var i;
  for (i = 0; i < length; i++) {
    tmp[i] = {index: i, value: arr[i]};
  }
  tmp.sort(function(a, b) {
    return compareFnc(a.value, b.value) || a.index - b.index;
  });
  for (i = 0; i < arr.length; i++) {
    arr[i] = tmp[i].value;
  }
};


/**
 * @param {Array.<*>} arr The array to search in.
 * @param {Function} func Comparison function.
 * @return {number} Return index.
 */
ol.array.findIndex = function(arr, func) {
  var index;
  var found = !arr.every(function(el, idx) {
    index = idx;
    return !func(el, idx, arr);
  });
  return found ? index : -1;
};


/**
 * @param {Array.<*>} arr The array to test.
 * @param {Function=} opt_func Comparison function.
 * @param {boolean=} opt_strict Strictly sorted (default false).
 * @return {boolean} Return index.
 */
ol.array.isSorted = function(arr, opt_func, opt_strict) {
  var compare = opt_func || ol.array.numberSafeCompareFunction;
  return arr.every(function(currentVal, index) {
    if (index === 0) {
      return true;
    }
    var res = compare(arr[index - 1], currentVal);
    return !(res > 0 || opt_strict && res === 0);
  });
};

goog.provide('ol.ResolutionConstraint');

goog.require('ol.array');
goog.require('ol.math');


/**
 * @param {Array.<number>} resolutions Resolutions.
 * @return {ol.ResolutionConstraintType} Zoom function.
 */
ol.ResolutionConstraint.createSnapToResolutions = function(resolutions) {
  return (
      /**
       * @param {number|undefined} resolution Resolution.
       * @param {number} delta Delta.
       * @param {number} direction Direction.
       * @return {number|undefined} Resolution.
       */
      function(resolution, delta, direction) {
        if (resolution !== undefined) {
          var z =
              ol.array.linearFindNearest(resolutions, resolution, direction);
          z = ol.math.clamp(z + delta, 0, resolutions.length - 1);
          var index = Math.floor(z);
          if (z != index && index < resolutions.length - 1) {
            var power = resolutions[index] / resolutions[index + 1];
            return resolutions[index] / Math.pow(power, z - index);
          } else {
            return resolutions[index];
          }
        } else {
          return undefined;
        }
      });
};


/**
 * @param {number} power Power.
 * @param {number} maxResolution Maximum resolution.
 * @param {number=} opt_maxLevel Maximum level.
 * @return {ol.ResolutionConstraintType} Zoom function.
 */
ol.ResolutionConstraint.createSnapToPower = function(power, maxResolution, opt_maxLevel) {
  return (
      /**
       * @param {number|undefined} resolution Resolution.
       * @param {number} delta Delta.
       * @param {number} direction Direction.
       * @return {number|undefined} Resolution.
       */
      function(resolution, delta, direction) {
        if (resolution !== undefined) {
          var offset = -direction / 2 + 0.5;
          var oldLevel = Math.floor(
              Math.log(maxResolution / resolution) / Math.log(power) + offset);
          var newLevel = Math.max(oldLevel + delta, 0);
          if (opt_maxLevel !== undefined) {
            newLevel = Math.min(newLevel, opt_maxLevel);
          }
          return maxResolution / Math.pow(power, newLevel);
        } else {
          return undefined;
        }
      });
};

goog.provide('ol.RotationConstraint');

goog.require('ol.math');


/**
 * @param {number|undefined} rotation Rotation.
 * @param {number} delta Delta.
 * @return {number|undefined} Rotation.
 */
ol.RotationConstraint.disable = function(rotation, delta) {
  if (rotation !== undefined) {
    return 0;
  } else {
    return undefined;
  }
};


/**
 * @param {number|undefined} rotation Rotation.
 * @param {number} delta Delta.
 * @return {number|undefined} Rotation.
 */
ol.RotationConstraint.none = function(rotation, delta) {
  if (rotation !== undefined) {
    return rotation + delta;
  } else {
    return undefined;
  }
};


/**
 * @param {number} n N.
 * @return {ol.RotationConstraintType} Rotation constraint.
 */
ol.RotationConstraint.createSnapToN = function(n) {
  var theta = 2 * Math.PI / n;
  return (
      /**
       * @param {number|undefined} rotation Rotation.
       * @param {number} delta Delta.
       * @return {number|undefined} Rotation.
       */
      function(rotation, delta) {
        if (rotation !== undefined) {
          rotation = Math.floor((rotation + delta) / theta + 0.5) * theta;
          return rotation;
        } else {
          return undefined;
        }
      });
};


/**
 * @param {number=} opt_tolerance Tolerance.
 * @return {ol.RotationConstraintType} Rotation constraint.
 */
ol.RotationConstraint.createSnapToZero = function(opt_tolerance) {
  var tolerance = opt_tolerance || ol.math.toRadians(5);
  return (
      /**
       * @param {number|undefined} rotation Rotation.
       * @param {number} delta Delta.
       * @return {number|undefined} Rotation.
       */
      function(rotation, delta) {
        if (rotation !== undefined) {
          if (Math.abs(rotation + delta) <= tolerance) {
            return 0;
          } else {
            return rotation + delta;
          }
        } else {
          return undefined;
        }
      });
};

goog.provide('ol.string');

/**
 * @param {number} number Number to be formatted
 * @param {number} width The desired width
 * @param {number=} opt_precision Precision of the output string (i.e. number of decimal places)
 * @returns {string} Formatted string
*/
ol.string.padNumber = function(number, width, opt_precision) {
  var numberString = opt_precision !== undefined ? number.toFixed(opt_precision) : '' + number;
  var decimal = numberString.indexOf('.');
  decimal = decimal === -1 ? numberString.length : decimal;
  return decimal > width ? numberString : new Array(1 + width - decimal).join('0') + numberString;
};

/**
 * Adapted from https://github.com/omichelsen/compare-versions/blob/master/index.js
 * @param {string|number} v1 First version
 * @param {string|number} v2 Second version
 * @returns {number} Value
 */
ol.string.compareVersions = function(v1, v2) {
  var s1 = ('' + v1).split('.');
  var s2 = ('' + v2).split('.');

  for (var i = 0; i < Math.max(s1.length, s2.length); i++) {
    var n1 = parseInt(s1[i] || '0', 10);
    var n2 = parseInt(s2[i] || '0', 10);

    if (n1 > n2) return 1;
    if (n2 > n1) return -1;
  }

  return 0;
};

goog.provide('ol.coordinate');

goog.require('ol.math');
goog.require('ol.string');


/**
 * Add `delta` to `coordinate`. `coordinate` is modified in place and returned
 * by the function.
 *
 * Example:
 *
 *     var coord = [7.85, 47.983333];
 *     ol.coordinate.add(coord, [-2, 4]);
 *     // coord is now [5.85, 51.983333]
 *
 * @param {ol.Coordinate} coordinate Coordinate.
 * @param {ol.Coordinate} delta Delta.
 * @return {ol.Coordinate} The input coordinate adjusted by the given delta.
 * @api stable
 */
ol.coordinate.add = function(coordinate, delta) {
  coordinate[0] += delta[0];
  coordinate[1] += delta[1];
  return coordinate;
};


/**
 * Calculates the point closest to the passed coordinate on the passed segment.
 * This is the foot of the perpendicular of the coordinate to the segment when
 * the foot is on the segment, or the closest segment coordinate when the foot
 * is outside the segment.
 *
 * @param {ol.Coordinate} coordinate The coordinate.
 * @param {Array.<ol.Coordinate>} segment The two coordinates of the segment.
 * @return {ol.Coordinate} The foot of the perpendicular of the coordinate to
 *     the segment.
 */
ol.coordinate.closestOnSegment = function(coordinate, segment) {
  var x0 = coordinate[0];
  var y0 = coordinate[1];
  var start = segment[0];
  var end = segment[1];
  var x1 = start[0];
  var y1 = start[1];
  var x2 = end[0];
  var y2 = end[1];
  var dx = x2 - x1;
  var dy = y2 - y1;
  var along = (dx === 0 && dy === 0) ? 0 :
      ((dx * (x0 - x1)) + (dy * (y0 - y1))) / ((dx * dx + dy * dy) || 0);
  var x, y;
  if (along <= 0) {
    x = x1;
    y = y1;
  } else if (along >= 1) {
    x = x2;
    y = y2;
  } else {
    x = x1 + along * dx;
    y = y1 + along * dy;
  }
  return [x, y];
};


/**
 * Returns a {@link ol.CoordinateFormatType} function that can be used to format
 * a {ol.Coordinate} to a string.
 *
 * Example without specifying the fractional digits:
 *
 *     var coord = [7.85, 47.983333];
 *     var stringifyFunc = ol.coordinate.createStringXY();
 *     var out = stringifyFunc(coord);
 *     // out is now '8, 48'
 *
 * Example with explicitly specifying 2 fractional digits:
 *
 *     var coord = [7.85, 47.983333];
 *     var stringifyFunc = ol.coordinate.createStringXY(2);
 *     var out = stringifyFunc(coord);
 *     // out is now '7.85, 47.98'
 *
 * @param {number=} opt_fractionDigits The number of digits to include
 *    after the decimal point. Default is `0`.
 * @return {ol.CoordinateFormatType} Coordinate format.
 * @api stable
 */
ol.coordinate.createStringXY = function(opt_fractionDigits) {
  return (
      /**
       * @param {ol.Coordinate|undefined} coordinate Coordinate.
       * @return {string} String XY.
       */
      function(coordinate) {
        return ol.coordinate.toStringXY(coordinate, opt_fractionDigits);
      });
};


/**
 * @private
 * @param {number} degrees Degrees.
 * @param {string} hemispheres Hemispheres.
 * @param {number=} opt_fractionDigits The number of digits to include
 *    after the decimal point. Default is `0`.
 * @return {string} String.
 */
ol.coordinate.degreesToStringHDMS_ = function(degrees, hemispheres, opt_fractionDigits) {
  var normalizedDegrees = ol.math.modulo(degrees + 180, 360) - 180;
  var x = Math.abs(3600 * normalizedDegrees);
  var dflPrecision = opt_fractionDigits || 0;
  return Math.floor(x / 3600) + '\u00b0 ' +
      ol.string.padNumber(Math.floor((x / 60) % 60), 2) + '\u2032 ' +
      ol.string.padNumber((x % 60), 2, dflPrecision) + '\u2033 ' +
      hemispheres.charAt(normalizedDegrees < 0 ? 1 : 0);
};


/**
 * Transforms the given {@link ol.Coordinate} to a string using the given string
 * template. The strings `{x}` and `{y}` in the template will be replaced with
 * the first and second coordinate values respectively.
 *
 * Example without specifying the fractional digits:
 *
 *     var coord = [7.85, 47.983333];
 *     var template = 'Coordinate is ({x}|{y}).';
 *     var out = ol.coordinate.format(coord, template);
 *     // out is now 'Coordinate is (8|48).'
 *
 * Example explicitly specifying the fractional digits:
 *
 *     var coord = [7.85, 47.983333];
 *     var template = 'Coordinate is ({x}|{y}).';
 *     var out = ol.coordinate.format(coord, template, 2);
 *     // out is now 'Coordinate is (7.85|47.98).'
 *
 * @param {ol.Coordinate|undefined} coordinate Coordinate.
 * @param {string} template A template string with `{x}` and `{y}` placeholders
 *     that will be replaced by first and second coordinate values.
 * @param {number=} opt_fractionDigits The number of digits to include
 *    after the decimal point. Default is `0`.
 * @return {string} Formatted coordinate.
 * @api stable
 */
ol.coordinate.format = function(coordinate, template, opt_fractionDigits) {
  if (coordinate) {
    return template
      .replace('{x}', coordinate[0].toFixed(opt_fractionDigits))
      .replace('{y}', coordinate[1].toFixed(opt_fractionDigits));
  } else {
    return '';
  }
};


/**
 * @param {ol.Coordinate} coordinate1 First coordinate.
 * @param {ol.Coordinate} coordinate2 Second coordinate.
 * @return {boolean} Whether the passed coordinates are equal.
 */
ol.coordinate.equals = function(coordinate1, coordinate2) {
  var equals = true;
  for (var i = coordinate1.length - 1; i >= 0; --i) {
    if (coordinate1[i] != coordinate2[i]) {
      equals = false;
      break;
    }
  }
  return equals;
};


/**
 * Rotate `coordinate` by `angle`. `coordinate` is modified in place and
 * returned by the function.
 *
 * Example:
 *
 *     var coord = [7.85, 47.983333];
 *     var rotateRadians = Math.PI / 2; // 90 degrees
 *     ol.coordinate.rotate(coord, rotateRadians);
 *     // coord is now [-47.983333, 7.85]
 *
 * @param {ol.Coordinate} coordinate Coordinate.
 * @param {number} angle Angle in radian.
 * @return {ol.Coordinate} Coordinate.
 * @api stable
 */
ol.coordinate.rotate = function(coordinate, angle) {
  var cosAngle = Math.cos(angle);
  var sinAngle = Math.sin(angle);
  var x = coordinate[0] * cosAngle - coordinate[1] * sinAngle;
  var y = coordinate[1] * cosAngle + coordinate[0] * sinAngle;
  coordinate[0] = x;
  coordinate[1] = y;
  return coordinate;
};


/**
 * Scale `coordinate` by `scale`. `coordinate` is modified in place and returned
 * by the function.
 *
 * Example:
 *
 *     var coord = [7.85, 47.983333];
 *     var scale = 1.2;
 *     ol.coordinate.scale(coord, scale);
 *     // coord is now [9.42, 57.5799996]
 *
 * @param {ol.Coordinate} coordinate Coordinate.
 * @param {number} scale Scale factor.
 * @return {ol.Coordinate} Coordinate.
 */
ol.coordinate.scale = function(coordinate, scale) {
  coordinate[0] *= scale;
  coordinate[1] *= scale;
  return coordinate;
};


/**
 * Subtract `delta` to `coordinate`. `coordinate` is modified in place and
 * returned by the function.
 *
 * @param {ol.Coordinate} coordinate Coordinate.
 * @param {ol.Coordinate} delta Delta.
 * @return {ol.Coordinate} Coordinate.
 */
ol.coordinate.sub = function(coordinate, delta) {
  coordinate[0] -= delta[0];
  coordinate[1] -= delta[1];
  return coordinate;
};


/**
 * @param {ol.Coordinate} coord1 First coordinate.
 * @param {ol.Coordinate} coord2 Second coordinate.
 * @return {number} Squared distance between coord1 and coord2.
 */
ol.coordinate.squaredDistance = function(coord1, coord2) {
  var dx = coord1[0] - coord2[0];
  var dy = coord1[1] - coord2[1];
  return dx * dx + dy * dy;
};


/**
 * Calculate the squared distance from a coordinate to a line segment.
 *
 * @param {ol.Coordinate} coordinate Coordinate of the point.
 * @param {Array.<ol.Coordinate>} segment Line segment (2 coordinates).
 * @return {number} Squared distance from the point to the line segment.
 */
ol.coordinate.squaredDistanceToSegment = function(coordinate, segment) {
  return ol.coordinate.squaredDistance(coordinate,
      ol.coordinate.closestOnSegment(coordinate, segment));
};


/**
 * Format a geographic coordinate with the hemisphere, degrees, minutes, and
 * seconds.
 *
 * Example without specifying fractional digits:
 *
 *     var coord = [7.85, 47.983333];
 *     var out = ol.coordinate.toStringHDMS(coord);
 *     // out is now '47° 58′ 60″ N 7° 50′ 60″ E'
 *
 * Example explicitly specifying 1 fractional digit:
 *
 *     var coord = [7.85, 47.983333];
 *     var out = ol.coordinate.toStringHDMS(coord, 1);
 *     // out is now '47° 58′ 60.0″ N 7° 50′ 60.0″ E'
 *
 * @param {ol.Coordinate|undefined} coordinate Coordinate.
 * @param {number=} opt_fractionDigits The number of digits to include
 *    after the decimal point. Default is `0`.
 * @return {string} Hemisphere, degrees, minutes and seconds.
 * @api stable
 */
ol.coordinate.toStringHDMS = function(coordinate, opt_fractionDigits) {
  if (coordinate) {
    return ol.coordinate.degreesToStringHDMS_(coordinate[1], 'NS', opt_fractionDigits) + ' ' +
        ol.coordinate.degreesToStringHDMS_(coordinate[0], 'EW', opt_fractionDigits);
  } else {
    return '';
  }
};


/**
 * Format a coordinate as a comma delimited string.
 *
 * Example without specifying fractional digits:
 *
 *     var coord = [7.85, 47.983333];
 *     var out = ol.coordinate.toStringXY(coord);
 *     // out is now '8, 48'
 *
 * Example explicitly specifying 1 fractional digit:
 *
 *     var coord = [7.85, 47.983333];
 *     var out = ol.coordinate.toStringXY(coord, 1);
 *     // out is now '7.8, 48.0'
 *
 * @param {ol.Coordinate|undefined} coordinate Coordinate.
 * @param {number=} opt_fractionDigits The number of digits to include
 *    after the decimal point. Default is `0`.
 * @return {string} XY.
 * @api stable
 */
ol.coordinate.toStringXY = function(coordinate, opt_fractionDigits) {
  return ol.coordinate.format(coordinate, '{x}, {y}', opt_fractionDigits);
};


/**
 * Create an ol.Coordinate from an Array and take into account axis order.
 *
 * Examples:
 *
 *     var northCoord = ol.coordinate.fromProjectedArray([1, 2], 'n');
 *     // northCoord is now [2, 1]
 *
 *     var eastCoord = ol.coordinate.fromProjectedArray([1, 2], 'e');
 *     // eastCoord is now [1, 2]
 *
 * @param {Array} array The array with coordinates.
 * @param {string} axis the axis info.
 * @return {ol.Coordinate} The coordinate created.
 */
ol.coordinate.fromProjectedArray = function(array, axis) {
  var firstAxis = axis.charAt(0);
  if (firstAxis === 'n' || firstAxis === 's') {
    return [array[1], array[0]];
  } else {
    return array;
  }
};

goog.provide('ol.extent');
goog.provide('ol.extent.Corner');
goog.provide('ol.extent.Relationship');

goog.require('ol.asserts');


/**
 * Extent corner.
 * @enum {string}
 */
ol.extent.Corner = {
  BOTTOM_LEFT: 'bottom-left',
  BOTTOM_RIGHT: 'bottom-right',
  TOP_LEFT: 'top-left',
  TOP_RIGHT: 'top-right'
};


/**
 * Relationship to an extent.
 * @enum {number}
 */
ol.extent.Relationship = {
  UNKNOWN: 0,
  INTERSECTING: 1,
  ABOVE: 2,
  RIGHT: 4,
  BELOW: 8,
  LEFT: 16
};


/**
 * Build an extent that includes all given coordinates.
 *
 * @param {Array.<ol.Coordinate>} coordinates Coordinates.
 * @return {ol.Extent} Bounding extent.
 * @api stable
 */
ol.extent.boundingExtent = function(coordinates) {
  var extent = ol.extent.createEmpty();
  for (var i = 0, ii = coordinates.length; i < ii; ++i) {
    ol.extent.extendCoordinate(extent, coordinates[i]);
  }
  return extent;
};


/**
 * @param {Array.<number>} xs Xs.
 * @param {Array.<number>} ys Ys.
 * @param {ol.Extent=} opt_extent Destination extent.
 * @private
 * @return {ol.Extent} Extent.
 */
ol.extent.boundingExtentXYs_ = function(xs, ys, opt_extent) {
  goog.DEBUG && console.assert(xs.length > 0, 'xs length should be larger than 0');
  goog.DEBUG && console.assert(ys.length > 0, 'ys length should be larger than 0');
  var minX = Math.min.apply(null, xs);
  var minY = Math.min.apply(null, ys);
  var maxX = Math.max.apply(null, xs);
  var maxY = Math.max.apply(null, ys);
  return ol.extent.createOrUpdate(minX, minY, maxX, maxY, opt_extent);
};


/**
 * Return extent increased by the provided value.
 * @param {ol.Extent} extent Extent.
 * @param {number} value The amount by which the extent should be buffered.
 * @param {ol.Extent=} opt_extent Extent.
 * @return {ol.Extent} Extent.
 * @api stable
 */
ol.extent.buffer = function(extent, value, opt_extent) {
  if (opt_extent) {
    opt_extent[0] = extent[0] - value;
    opt_extent[1] = extent[1] - value;
    opt_extent[2] = extent[2] + value;
    opt_extent[3] = extent[3] + value;
    return opt_extent;
  } else {
    return [
      extent[0] - value,
      extent[1] - value,
      extent[2] + value,
      extent[3] + value
    ];
  }
};


/**
 * Creates a clone of an extent.
 *
 * @param {ol.Extent} extent Extent to clone.
 * @param {ol.Extent=} opt_extent Extent.
 * @return {ol.Extent} The clone.
 */
ol.extent.clone = function(extent, opt_extent) {
  if (opt_extent) {
    opt_extent[0] = extent[0];
    opt_extent[1] = extent[1];
    opt_extent[2] = extent[2];
    opt_extent[3] = extent[3];
    return opt_extent;
  } else {
    return extent.slice();
  }
};


/**
 * @param {ol.Extent} extent Extent.
 * @param {number} x X.
 * @param {number} y Y.
 * @return {number} Closest squared distance.
 */
ol.extent.closestSquaredDistanceXY = function(extent, x, y) {
  var dx, dy;
  if (x < extent[0]) {
    dx = extent[0] - x;
  } else if (extent[2] < x) {
    dx = x - extent[2];
  } else {
    dx = 0;
  }
  if (y < extent[1]) {
    dy = extent[1] - y;
  } else if (extent[3] < y) {
    dy = y - extent[3];
  } else {
    dy = 0;
  }
  return dx * dx + dy * dy;
};


/**
 * Check if the passed coordinate is contained or on the edge of the extent.
 *
 * @param {ol.Extent} extent Extent.
 * @param {ol.Coordinate} coordinate Coordinate.
 * @return {boolean} The coordinate is contained in the extent.
 * @api stable
 */
ol.extent.containsCoordinate = function(extent, coordinate) {
  return ol.extent.containsXY(extent, coordinate[0], coordinate[1]);
};


/**
 * Check if one extent contains another.
 *
 * An extent is deemed contained if it lies completely within the other extent,
 * including if they share one or more edges.
 *
 * @param {ol.Extent} extent1 Extent 1.
 * @param {ol.Extent} extent2 Extent 2.
 * @return {boolean} The second extent is contained by or on the edge of the
 *     first.
 * @api stable
 */
ol.extent.containsExtent = function(extent1, extent2) {
  return extent1[0] <= extent2[0] && extent2[2] <= extent1[2] &&
      extent1[1] <= extent2[1] && extent2[3] <= extent1[3];
};


/**
 * Check if the passed coordinate is contained or on the edge of the extent.
 *
 * @param {ol.Extent} extent Extent.
 * @param {number} x X coordinate.
 * @param {number} y Y coordinate.
 * @return {boolean} The x, y values are contained in the extent.
 * @api stable
 */
ol.extent.containsXY = function(extent, x, y) {
  return extent[0] <= x && x <= extent[2] && extent[1] <= y && y <= extent[3];
};


/**
 * Get the relationship between a coordinate and extent.
 * @param {ol.Extent} extent The extent.
 * @param {ol.Coordinate} coordinate The coordinate.
 * @return {number} The relationship (bitwise compare with
 *     ol.extent.Relationship).
 */
ol.extent.coordinateRelationship = function(extent, coordinate) {
  var minX = extent[0];
  var minY = extent[1];
  var maxX = extent[2];
  var maxY = extent[3];
  var x = coordinate[0];
  var y = coordinate[1];
  var relationship = ol.extent.Relationship.UNKNOWN;
  if (x < minX) {
    relationship = relationship | ol.extent.Relationship.LEFT;
  } else if (x > maxX) {
    relationship = relationship | ol.extent.Relationship.RIGHT;
  }
  if (y < minY) {
    relationship = relationship | ol.extent.Relationship.BELOW;
  } else if (y > maxY) {
    relationship = relationship | ol.extent.Relationship.ABOVE;
  }
  if (relationship === ol.extent.Relationship.UNKNOWN) {
    relationship = ol.extent.Relationship.INTERSECTING;
  }
  return relationship;
};


/**
 * Create an empty extent.
 * @return {ol.Extent} Empty extent.
 * @api stable
 */
ol.extent.createEmpty = function() {
  return [Infinity, Infinity, -Infinity, -Infinity];
};


/**
 * Create a new extent or update the provided extent.
 * @param {number} minX Minimum X.
 * @param {number} minY Minimum Y.
 * @param {number} maxX Maximum X.
 * @param {number} maxY Maximum Y.
 * @param {ol.Extent=} opt_extent Destination extent.
 * @return {ol.Extent} Extent.
 */
ol.extent.createOrUpdate = function(minX, minY, maxX, maxY, opt_extent) {
  if (opt_extent) {
    opt_extent[0] = minX;
    opt_extent[1] = minY;
    opt_extent[2] = maxX;
    opt_extent[3] = maxY;
    return opt_extent;
  } else {
    return [minX, minY, maxX, maxY];
  }
};


/**
 * Create a new empty extent or make the provided one empty.
 * @param {ol.Extent=} opt_extent Extent.
 * @return {ol.Extent} Extent.
 */
ol.extent.createOrUpdateEmpty = function(opt_extent) {
  return ol.extent.createOrUpdate(
      Infinity, Infinity, -Infinity, -Infinity, opt_extent);
};


/**
 * @param {ol.Coordinate} coordinate Coordinate.
 * @param {ol.Extent=} opt_extent Extent.
 * @return {ol.Extent} Extent.
 */
ol.extent.createOrUpdateFromCoordinate = function(coordinate, opt_extent) {
  var x = coordinate[0];
  var y = coordinate[1];
  return ol.extent.createOrUpdate(x, y, x, y, opt_extent);
};


/**
 * @param {Array.<ol.Coordinate>} coordinates Coordinates.
 * @param {ol.Extent=} opt_extent Extent.
 * @return {ol.Extent} Extent.
 */
ol.extent.createOrUpdateFromCoordinates = function(coordinates, opt_extent) {
  var extent = ol.extent.createOrUpdateEmpty(opt_extent);
  return ol.extent.extendCoordinates(extent, coordinates);
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @param {ol.Extent=} opt_extent Extent.
 * @return {ol.Extent} Extent.
 */
ol.extent.createOrUpdateFromFlatCoordinates = function(flatCoordinates, offset, end, stride, opt_extent) {
  var extent = ol.extent.createOrUpdateEmpty(opt_extent);
  return ol.extent.extendFlatCoordinates(
      extent, flatCoordinates, offset, end, stride);
};


/**
 * @param {Array.<Array.<ol.Coordinate>>} rings Rings.
 * @param {ol.Extent=} opt_extent Extent.
 * @return {ol.Extent} Extent.
 */
ol.extent.createOrUpdateFromRings = function(rings, opt_extent) {
  var extent = ol.extent.createOrUpdateEmpty(opt_extent);
  return ol.extent.extendRings(extent, rings);
};


/**
 * Empty an extent in place.
 * @param {ol.Extent} extent Extent.
 * @return {ol.Extent} Extent.
 */
ol.extent.empty = function(extent) {
  extent[0] = extent[1] = Infinity;
  extent[2] = extent[3] = -Infinity;
  return extent;
};


/**
 * Determine if two extents are equivalent.
 * @param {ol.Extent} extent1 Extent 1.
 * @param {ol.Extent} extent2 Extent 2.
 * @return {boolean} The two extents are equivalent.
 * @api stable
 */
ol.extent.equals = function(extent1, extent2) {
  return extent1[0] == extent2[0] && extent1[2] == extent2[2] &&
      extent1[1] == extent2[1] && extent1[3] == extent2[3];
};


/**
 * Modify an extent to include another extent.
 * @param {ol.Extent} extent1 The extent to be modified.
 * @param {ol.Extent} extent2 The extent that will be included in the first.
 * @return {ol.Extent} A reference to the first (extended) extent.
 * @api stable
 */
ol.extent.extend = function(extent1, extent2) {
  if (extent2[0] < extent1[0]) {
    extent1[0] = extent2[0];
  }
  if (extent2[2] > extent1[2]) {
    extent1[2] = extent2[2];
  }
  if (extent2[1] < extent1[1]) {
    extent1[1] = extent2[1];
  }
  if (extent2[3] > extent1[3]) {
    extent1[3] = extent2[3];
  }
  return extent1;
};


/**
 * @param {ol.Extent} extent Extent.
 * @param {ol.Coordinate} coordinate Coordinate.
 */
ol.extent.extendCoordinate = function(extent, coordinate) {
  if (coordinate[0] < extent[0]) {
    extent[0] = coordinate[0];
  }
  if (coordinate[0] > extent[2]) {
    extent[2] = coordinate[0];
  }
  if (coordinate[1] < extent[1]) {
    extent[1] = coordinate[1];
  }
  if (coordinate[1] > extent[3]) {
    extent[3] = coordinate[1];
  }
};


/**
 * @param {ol.Extent} extent Extent.
 * @param {Array.<ol.Coordinate>} coordinates Coordinates.
 * @return {ol.Extent} Extent.
 */
ol.extent.extendCoordinates = function(extent, coordinates) {
  var i, ii;
  for (i = 0, ii = coordinates.length; i < ii; ++i) {
    ol.extent.extendCoordinate(extent, coordinates[i]);
  }
  return extent;
};


/**
 * @param {ol.Extent} extent Extent.
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @return {ol.Extent} Extent.
 */
ol.extent.extendFlatCoordinates = function(extent, flatCoordinates, offset, end, stride) {
  for (; offset < end; offset += stride) {
    ol.extent.extendXY(
        extent, flatCoordinates[offset], flatCoordinates[offset + 1]);
  }
  return extent;
};


/**
 * @param {ol.Extent} extent Extent.
 * @param {Array.<Array.<ol.Coordinate>>} rings Rings.
 * @return {ol.Extent} Extent.
 */
ol.extent.extendRings = function(extent, rings) {
  var i, ii;
  for (i = 0, ii = rings.length; i < ii; ++i) {
    ol.extent.extendCoordinates(extent, rings[i]);
  }
  return extent;
};


/**
 * @param {ol.Extent} extent Extent.
 * @param {number} x X.
 * @param {number} y Y.
 */
ol.extent.extendXY = function(extent, x, y) {
  extent[0] = Math.min(extent[0], x);
  extent[1] = Math.min(extent[1], y);
  extent[2] = Math.max(extent[2], x);
  extent[3] = Math.max(extent[3], y);
};


/**
 * This function calls `callback` for each corner of the extent. If the
 * callback returns a truthy value the function returns that value
 * immediately. Otherwise the function returns `false`.
 * @param {ol.Extent} extent Extent.
 * @param {function(this:T, ol.Coordinate): S} callback Callback.
 * @param {T=} opt_this Value to use as `this` when executing `callback`.
 * @return {S|boolean} Value.
 * @template S, T
 */
ol.extent.forEachCorner = function(extent, callback, opt_this) {
  var val;
  val = callback.call(opt_this, ol.extent.getBottomLeft(extent));
  if (val) {
    return val;
  }
  val = callback.call(opt_this, ol.extent.getBottomRight(extent));
  if (val) {
    return val;
  }
  val = callback.call(opt_this, ol.extent.getTopRight(extent));
  if (val) {
    return val;
  }
  val = callback.call(opt_this, ol.extent.getTopLeft(extent));
  if (val) {
    return val;
  }
  return false;
};


/**
 * @param {ol.Extent} extent Extent.
 * @return {number} Area.
 */
ol.extent.getArea = function(extent) {
  var area = 0;
  if (!ol.extent.isEmpty(extent)) {
    area = ol.extent.getWidth(extent) * ol.extent.getHeight(extent);
  }
  return area;
};


/**
 * Get the bottom left coordinate of an extent.
 * @param {ol.Extent} extent Extent.
 * @return {ol.Coordinate} Bottom left coordinate.
 * @api stable
 */
ol.extent.getBottomLeft = function(extent) {
  return [extent[0], extent[1]];
};


/**
 * Get the bottom right coordinate of an extent.
 * @param {ol.Extent} extent Extent.
 * @return {ol.Coordinate} Bottom right coordinate.
 * @api stable
 */
ol.extent.getBottomRight = function(extent) {
  return [extent[2], extent[1]];
};


/**
 * Get the center coordinate of an extent.
 * @param {ol.Extent} extent Extent.
 * @return {ol.Coordinate} Center.
 * @api stable
 */
ol.extent.getCenter = function(extent) {
  return [(extent[0] + extent[2]) / 2, (extent[1] + extent[3]) / 2];
};


/**
 * Get a corner coordinate of an extent.
 * @param {ol.Extent} extent Extent.
 * @param {ol.extent.Corner} corner Corner.
 * @return {ol.Coordinate} Corner coordinate.
 */
ol.extent.getCorner = function(extent, corner) {
  var coordinate;
  if (corner === ol.extent.Corner.BOTTOM_LEFT) {
    coordinate = ol.extent.getBottomLeft(extent);
  } else if (corner === ol.extent.Corner.BOTTOM_RIGHT) {
    coordinate = ol.extent.getBottomRight(extent);
  } else if (corner === ol.extent.Corner.TOP_LEFT) {
    coordinate = ol.extent.getTopLeft(extent);
  } else if (corner === ol.extent.Corner.TOP_RIGHT) {
    coordinate = ol.extent.getTopRight(extent);
  } else {
    ol.asserts.assert(false, 13); // Invalid corner
  }
  return /** @type {!ol.Coordinate} */ (coordinate);
};


/**
 * @param {ol.Extent} extent1 Extent 1.
 * @param {ol.Extent} extent2 Extent 2.
 * @return {number} Enlarged area.
 */
ol.extent.getEnlargedArea = function(extent1, extent2) {
  var minX = Math.min(extent1[0], extent2[0]);
  var minY = Math.min(extent1[1], extent2[1]);
  var maxX = Math.max(extent1[2], extent2[2]);
  var maxY = Math.max(extent1[3], extent2[3]);
  return (maxX - minX) * (maxY - minY);
};


/**
 * @param {ol.Coordinate} center Center.
 * @param {number} resolution Resolution.
 * @param {number} rotation Rotation.
 * @param {ol.Size} size Size.
 * @param {ol.Extent=} opt_extent Destination extent.
 * @return {ol.Extent} Extent.
 */
ol.extent.getForViewAndSize = function(center, resolution, rotation, size, opt_extent) {
  var dx = resolution * size[0] / 2;
  var dy = resolution * size[1] / 2;
  var cosRotation = Math.cos(rotation);
  var sinRotation = Math.sin(rotation);
  var xCos = dx * cosRotation;
  var xSin = dx * sinRotation;
  var yCos = dy * cosRotation;
  var ySin = dy * sinRotation;
  var x = center[0];
  var y = center[1];
  var x0 = x - xCos + ySin;
  var x1 = x - xCos - ySin;
  var x2 = x + xCos - ySin;
  var x3 = x + xCos + ySin;
  var y0 = y - xSin - yCos;
  var y1 = y - xSin + yCos;
  var y2 = y + xSin + yCos;
  var y3 = y + xSin - yCos;
  return ol.extent.createOrUpdate(
      Math.min(x0, x1, x2, x3), Math.min(y0, y1, y2, y3),
      Math.max(x0, x1, x2, x3), Math.max(y0, y1, y2, y3),
      opt_extent);
};


/**
 * Get the height of an extent.
 * @param {ol.Extent} extent Extent.
 * @return {number} Height.
 * @api stable
 */
ol.extent.getHeight = function(extent) {
  return extent[3] - extent[1];
};


/**
 * @param {ol.Extent} extent1 Extent 1.
 * @param {ol.Extent} extent2 Extent 2.
 * @return {number} Intersection area.
 */
ol.extent.getIntersectionArea = function(extent1, extent2) {
  var intersection = ol.extent.getIntersection(extent1, extent2);
  return ol.extent.getArea(intersection);
};


/**
 * Get the intersection of two extents.
 * @param {ol.Extent} extent1 Extent 1.
 * @param {ol.Extent} extent2 Extent 2.
 * @param {ol.Extent=} opt_extent Optional extent to populate with intersection.
 * @return {ol.Extent} Intersecting extent.
 * @api stable
 */
ol.extent.getIntersection = function(extent1, extent2, opt_extent) {
  var intersection = opt_extent ? opt_extent : ol.extent.createEmpty();
  if (ol.extent.intersects(extent1, extent2)) {
    if (extent1[0] > extent2[0]) {
      intersection[0] = extent1[0];
    } else {
      intersection[0] = extent2[0];
    }
    if (extent1[1] > extent2[1]) {
      intersection[1] = extent1[1];
    } else {
      intersection[1] = extent2[1];
    }
    if (extent1[2] < extent2[2]) {
      intersection[2] = extent1[2];
    } else {
      intersection[2] = extent2[2];
    }
    if (extent1[3] < extent2[3]) {
      intersection[3] = extent1[3];
    } else {
      intersection[3] = extent2[3];
    }
  }
  return intersection;
};


/**
 * @param {ol.Extent} extent Extent.
 * @return {number} Margin.
 */
ol.extent.getMargin = function(extent) {
  return ol.extent.getWidth(extent) + ol.extent.getHeight(extent);
};


/**
 * Get the size (width, height) of an extent.
 * @param {ol.Extent} extent The extent.
 * @return {ol.Size} The extent size.
 * @api stable
 */
ol.extent.getSize = function(extent) {
  return [extent[2] - extent[0], extent[3] - extent[1]];
};


/**
 * Get the top left coordinate of an extent.
 * @param {ol.Extent} extent Extent.
 * @return {ol.Coordinate} Top left coordinate.
 * @api stable
 */
ol.extent.getTopLeft = function(extent) {
  return [extent[0], extent[3]];
};


/**
 * Get the top right coordinate of an extent.
 * @param {ol.Extent} extent Extent.
 * @return {ol.Coordinate} Top right coordinate.
 * @api stable
 */
ol.extent.getTopRight = function(extent) {
  return [extent[2], extent[3]];
};


/**
 * Get the width of an extent.
 * @param {ol.Extent} extent Extent.
 * @return {number} Width.
 * @api stable
 */
ol.extent.getWidth = function(extent) {
  return extent[2] - extent[0];
};


/**
 * Determine if one extent intersects another.
 * @param {ol.Extent} extent1 Extent 1.
 * @param {ol.Extent} extent2 Extent.
 * @return {boolean} The two extents intersect.
 * @api stable
 */
ol.extent.intersects = function(extent1, extent2) {
  return extent1[0] <= extent2[2] &&
      extent1[2] >= extent2[0] &&
      extent1[1] <= extent2[3] &&
      extent1[3] >= extent2[1];
};


/**
 * Determine if an extent is empty.
 * @param {ol.Extent} extent Extent.
 * @return {boolean} Is empty.
 * @api stable
 */
ol.extent.isEmpty = function(extent) {
  return extent[2] < extent[0] || extent[3] < extent[1];
};


/**
 * @param {ol.Extent} extent Extent.
 * @return {boolean} Is infinite.
 */
ol.extent.isInfinite = function(extent) {
  return extent[0] == -Infinity || extent[1] == -Infinity ||
      extent[2] == Infinity || extent[3] == Infinity;
};


/**
 * @param {ol.Extent} extent Extent.
 * @param {ol.Coordinate} coordinate Coordinate.
 * @return {ol.Coordinate} Coordinate.
 */
ol.extent.normalize = function(extent, coordinate) {
  return [
    (coordinate[0] - extent[0]) / (extent[2] - extent[0]),
    (coordinate[1] - extent[1]) / (extent[3] - extent[1])
  ];
};


/**
 * @param {ol.Extent} extent Extent.
 * @param {ol.Extent=} opt_extent Extent.
 * @return {ol.Extent} Extent.
 */
ol.extent.returnOrUpdate = function(extent, opt_extent) {
  if (opt_extent) {
    opt_extent[0] = extent[0];
    opt_extent[1] = extent[1];
    opt_extent[2] = extent[2];
    opt_extent[3] = extent[3];
    return opt_extent;
  } else {
    return extent;
  }
};


/**
 * @param {ol.Extent} extent Extent.
 * @param {number} value Value.
 */
ol.extent.scaleFromCenter = function(extent, value) {
  var deltaX = ((extent[2] - extent[0]) / 2) * (value - 1);
  var deltaY = ((extent[3] - extent[1]) / 2) * (value - 1);
  extent[0] -= deltaX;
  extent[2] += deltaX;
  extent[1] -= deltaY;
  extent[3] += deltaY;
};


/**
 * Determine if the segment between two coordinates intersects (crosses,
 * touches, or is contained by) the provided extent.
 * @param {ol.Extent} extent The extent.
 * @param {ol.Coordinate} start Segment start coordinate.
 * @param {ol.Coordinate} end Segment end coordinate.
 * @return {boolean} The segment intersects the extent.
 */
ol.extent.intersectsSegment = function(extent, start, end) {
  var intersects = false;
  var startRel = ol.extent.coordinateRelationship(extent, start);
  var endRel = ol.extent.coordinateRelationship(extent, end);
  if (startRel === ol.extent.Relationship.INTERSECTING ||
      endRel === ol.extent.Relationship.INTERSECTING) {
    intersects = true;
  } else {
    var minX = extent[0];
    var minY = extent[1];
    var maxX = extent[2];
    var maxY = extent[3];
    var startX = start[0];
    var startY = start[1];
    var endX = end[0];
    var endY = end[1];
    var slope = (endY - startY) / (endX - startX);
    var x, y;
    if (!!(endRel & ol.extent.Relationship.ABOVE) &&
        !(startRel & ol.extent.Relationship.ABOVE)) {
      // potentially intersects top
      x = endX - ((endY - maxY) / slope);
      intersects = x >= minX && x <= maxX;
    }
    if (!intersects && !!(endRel & ol.extent.Relationship.RIGHT) &&
        !(startRel & ol.extent.Relationship.RIGHT)) {
      // potentially intersects right
      y = endY - ((endX - maxX) * slope);
      intersects = y >= minY && y <= maxY;
    }
    if (!intersects && !!(endRel & ol.extent.Relationship.BELOW) &&
        !(startRel & ol.extent.Relationship.BELOW)) {
      // potentially intersects bottom
      x = endX - ((endY - minY) / slope);
      intersects = x >= minX && x <= maxX;
    }
    if (!intersects && !!(endRel & ol.extent.Relationship.LEFT) &&
        !(startRel & ol.extent.Relationship.LEFT)) {
      // potentially intersects left
      y = endY - ((endX - minX) * slope);
      intersects = y >= minY && y <= maxY;
    }

  }
  return intersects;
};


/**
 * @param {ol.Extent} extent1 Extent 1.
 * @param {ol.Extent} extent2 Extent 2.
 * @return {boolean} Touches.
 */
ol.extent.touches = function(extent1, extent2) {
  var intersects = ol.extent.intersects(extent1, extent2);
  return intersects &&
      (extent1[0] == extent2[2] || extent1[2] == extent2[0] ||
       extent1[1] == extent2[3] || extent1[3] == extent2[1]);
};


/**
 * Apply a transform function to the extent.
 * @param {ol.Extent} extent Extent.
 * @param {ol.TransformFunction} transformFn Transform function.  Called with
 * [minX, minY, maxX, maxY] extent coordinates.
 * @param {ol.Extent=} opt_extent Destination extent.
 * @return {ol.Extent} Extent.
 * @api stable
 */
ol.extent.applyTransform = function(extent, transformFn, opt_extent) {
  var coordinates = [
    extent[0], extent[1],
    extent[0], extent[3],
    extent[2], extent[1],
    extent[2], extent[3]
  ];
  transformFn(coordinates, coordinates, 2);
  var xs = [coordinates[0], coordinates[2], coordinates[4], coordinates[6]];
  var ys = [coordinates[1], coordinates[3], coordinates[5], coordinates[7]];
  return ol.extent.boundingExtentXYs_(xs, ys, opt_extent);
};

goog.provide('ol.functions');

/**
 * Always returns true.
 * @returns {boolean} true.
 */
ol.functions.TRUE = function() {
  return true;
};

/**
 * Always returns false.
 * @returns {boolean} false.
 */
ol.functions.FALSE = function() {
  return false;
};

/**
 * @license
 * Latitude/longitude spherical geodesy formulae taken from
 * http://www.movable-type.co.uk/scripts/latlong.html
 * Licensed under CC-BY-3.0.
 */

goog.provide('ol.Sphere');

goog.require('ol.math');


/**
 * @classdesc
 * Class to create objects that can be used with {@link
 * ol.geom.Polygon.circular}.
 *
 * For example to create a sphere whose radius is equal to the semi-major
 * axis of the WGS84 ellipsoid:
 *
 * ```js
 * var wgs84Sphere= new ol.Sphere(6378137);
 * ```
 *
 * @constructor
 * @param {number} radius Radius.
 * @api
 */
ol.Sphere = function(radius) {

  /**
   * @type {number}
   */
  this.radius = radius;

};


/**
 * Returns the geodesic area for a list of coordinates.
 *
 * [Reference](http://trs-new.jpl.nasa.gov/dspace/handle/2014/40409)
 * Robert. G. Chamberlain and William H. Duquette, "Some Algorithms for
 * Polygons on a Sphere", JPL Publication 07-03, Jet Propulsion
 * Laboratory, Pasadena, CA, June 2007
 *
 * @param {Array.<ol.Coordinate>} coordinates List of coordinates of a linear
 * ring. If the ring is oriented clockwise, the area will be positive,
 * otherwise it will be negative.
 * @return {number} Area.
 * @api
 */
ol.Sphere.prototype.geodesicArea = function(coordinates) {
  var area = 0, len = coordinates.length;
  var x1 = coordinates[len - 1][0];
  var y1 = coordinates[len - 1][1];
  for (var i = 0; i < len; i++) {
    var x2 = coordinates[i][0], y2 = coordinates[i][1];
    area += ol.math.toRadians(x2 - x1) *
        (2 + Math.sin(ol.math.toRadians(y1)) +
        Math.sin(ol.math.toRadians(y2)));
    x1 = x2;
    y1 = y2;
  }
  return area * this.radius * this.radius / 2.0;
};


/**
 * Returns the distance from c1 to c2 using the haversine formula.
 *
 * @param {ol.Coordinate} c1 Coordinate 1.
 * @param {ol.Coordinate} c2 Coordinate 2.
 * @return {number} Haversine distance.
 * @api
 */
ol.Sphere.prototype.haversineDistance = function(c1, c2) {
  var lat1 = ol.math.toRadians(c1[1]);
  var lat2 = ol.math.toRadians(c2[1]);
  var deltaLatBy2 = (lat2 - lat1) / 2;
  var deltaLonBy2 = ol.math.toRadians(c2[0] - c1[0]) / 2;
  var a = Math.sin(deltaLatBy2) * Math.sin(deltaLatBy2) +
      Math.sin(deltaLonBy2) * Math.sin(deltaLonBy2) *
      Math.cos(lat1) * Math.cos(lat2);
  return 2 * this.radius * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
};


/**
 * Returns the coordinate at the given distance and bearing from `c1`.
 *
 * @param {ol.Coordinate} c1 The origin point (`[lon, lat]` in degrees).
 * @param {number} distance The great-circle distance between the origin
 *     point and the target point.
 * @param {number} bearing The bearing (in radians).
 * @return {ol.Coordinate} The target point.
 */
ol.Sphere.prototype.offset = function(c1, distance, bearing) {
  var lat1 = ol.math.toRadians(c1[1]);
  var lon1 = ol.math.toRadians(c1[0]);
  var dByR = distance / this.radius;
  var lat = Math.asin(
      Math.sin(lat1) * Math.cos(dByR) +
      Math.cos(lat1) * Math.sin(dByR) * Math.cos(bearing));
  var lon = lon1 + Math.atan2(
      Math.sin(bearing) * Math.sin(dByR) * Math.cos(lat1),
      Math.cos(dByR) - Math.sin(lat1) * Math.sin(lat));
  return [ol.math.toDegrees(lon), ol.math.toDegrees(lat)];
};

goog.provide('ol.sphere.NORMAL');

goog.require('ol.Sphere');


/**
 * The normal sphere.
 * @const
 * @type {ol.Sphere}
 */
ol.sphere.NORMAL = new ol.Sphere(6370997);

goog.provide('ol.proj');
goog.provide('ol.proj.METERS_PER_UNIT');
goog.provide('ol.proj.Projection');
goog.provide('ol.proj.Units');

goog.require('ol');
goog.require('ol.extent');
goog.require('ol.obj');
goog.require('ol.sphere.NORMAL');


/**
 * Projection units: `'degrees'`, `'ft'`, `'m'`, `'pixels'`, `'tile-pixels'` or
 * `'us-ft'`.
 * @enum {string}
 */
ol.proj.Units = {
  DEGREES: 'degrees',
  FEET: 'ft',
  METERS: 'm',
  PIXELS: 'pixels',
  TILE_PIXELS: 'tile-pixels',
  USFEET: 'us-ft'
};


/**
 * Meters per unit lookup table.
 * @const
 * @type {Object.<ol.proj.Units, number>}
 * @api stable
 */
ol.proj.METERS_PER_UNIT = {};
ol.proj.METERS_PER_UNIT[ol.proj.Units.DEGREES] =
    2 * Math.PI * ol.sphere.NORMAL.radius / 360;
ol.proj.METERS_PER_UNIT[ol.proj.Units.FEET] = 0.3048;
ol.proj.METERS_PER_UNIT[ol.proj.Units.METERS] = 1;
ol.proj.METERS_PER_UNIT[ol.proj.Units.USFEET] = 1200 / 3937;


/**
 * @classdesc
 * Projection definition class. One of these is created for each projection
 * supported in the application and stored in the {@link ol.proj} namespace.
 * You can use these in applications, but this is not required, as API params
 * and options use {@link ol.ProjectionLike} which means the simple string
 * code will suffice.
 *
 * You can use {@link ol.proj.get} to retrieve the object for a particular
 * projection.
 *
 * The library includes definitions for `EPSG:4326` and `EPSG:3857`, together
 * with the following aliases:
 * * `EPSG:4326`: CRS:84, urn:ogc:def:crs:EPSG:6.6:4326,
 *     urn:ogc:def:crs:OGC:1.3:CRS84, urn:ogc:def:crs:OGC:2:84,
 *     http://www.opengis.net/gml/srs/epsg.xml#4326,
 *     urn:x-ogc:def:crs:EPSG:4326
 * * `EPSG:3857`: EPSG:102100, EPSG:102113, EPSG:900913,
 *     urn:ogc:def:crs:EPSG:6.18:3:3857,
 *     http://www.opengis.net/gml/srs/epsg.xml#3857
 *
 * If you use proj4js, aliases can be added using `proj4.defs()`; see
 * [documentation](https://github.com/proj4js/proj4js). To set an alternative
 * namespace for proj4, use {@link ol.proj.setProj4}.
 *
 * @constructor
 * @param {olx.ProjectionOptions} options Projection options.
 * @struct
 * @api stable
 */
ol.proj.Projection = function(options) {

  /**
   * @private
   * @type {string}
   */
  this.code_ = options.code;

  /**
   * @private
   * @type {ol.proj.Units}
   */
  this.units_ = /** @type {ol.proj.Units} */ (options.units);

  /**
   * @private
   * @type {ol.Extent}
   */
  this.extent_ = options.extent !== undefined ? options.extent : null;

  /**
   * @private
   * @type {ol.Extent}
   */
  this.worldExtent_ = options.worldExtent !== undefined ?
      options.worldExtent : null;

  /**
   * @private
   * @type {string}
   */
  this.axisOrientation_ = options.axisOrientation !== undefined ?
      options.axisOrientation : 'enu';

  /**
   * @private
   * @type {boolean}
   */
  this.global_ = options.global !== undefined ? options.global : false;


  /**
   * @private
   * @type {boolean}
   */
  this.canWrapX_ = !!(this.global_ && this.extent_);

  /**
  * @private
  * @type {function(number, ol.Coordinate):number}
  */
  this.getPointResolutionFunc_ = options.getPointResolution !== undefined ?
      options.getPointResolution : this.getPointResolution_;

  /**
   * @private
   * @type {ol.tilegrid.TileGrid}
   */
  this.defaultTileGrid_ = null;

  /**
   * @private
   * @type {number|undefined}
   */
  this.metersPerUnit_ = options.metersPerUnit;

  var projections = ol.proj.projections_;
  var code = options.code;
  goog.DEBUG && console.assert(code !== undefined,
      'Option "code" is required for constructing instance');
  if (ol.ENABLE_PROJ4JS) {
    var proj4js = ol.proj.proj4_ || ol.global['proj4'];
    if (typeof proj4js == 'function' && projections[code] === undefined) {
      var def = proj4js.defs(code);
      if (def !== undefined) {
        if (def.axis !== undefined && options.axisOrientation === undefined) {
          this.axisOrientation_ = def.axis;
        }
        if (options.metersPerUnit === undefined) {
          this.metersPerUnit_ = def.to_meter;
        }
        if (options.units === undefined) {
          this.units_ = def.units;
        }
        var currentCode, currentDef, currentProj, proj4Transform;
        for (currentCode in projections) {
          currentDef = proj4js.defs(currentCode);
          if (currentDef !== undefined) {
            currentProj = ol.proj.get(currentCode);
            if (currentDef === def) {
              ol.proj.addEquivalentProjections([currentProj, this]);
            } else {
              proj4Transform = proj4js(currentCode, code);
              ol.proj.addCoordinateTransforms(currentProj, this,
                  proj4Transform.forward, proj4Transform.inverse);
            }
          }
        }
      }
    }
  }

};


/**
 * @return {boolean} The projection is suitable for wrapping the x-axis
 */
ol.proj.Projection.prototype.canWrapX = function() {
  return this.canWrapX_;
};


/**
 * Get the code for this projection, e.g. 'EPSG:4326'.
 * @return {string} Code.
 * @api stable
 */
ol.proj.Projection.prototype.getCode = function() {
  return this.code_;
};


/**
 * Get the validity extent for this projection.
 * @return {ol.Extent} Extent.
 * @api stable
 */
ol.proj.Projection.prototype.getExtent = function() {
  return this.extent_;
};


/**
 * Get the units of this projection.
 * @return {ol.proj.Units} Units.
 * @api stable
 */
ol.proj.Projection.prototype.getUnits = function() {
  return this.units_;
};


/**
 * Get the amount of meters per unit of this projection.  If the projection is
 * not configured with `metersPerUnit` or a units identifier, the return is
 * `undefined`.
 * @return {number|undefined} Meters.
 * @api stable
 */
ol.proj.Projection.prototype.getMetersPerUnit = function() {
  return this.metersPerUnit_ || ol.proj.METERS_PER_UNIT[this.units_];
};


/**
 * Get the world extent for this projection.
 * @return {ol.Extent} Extent.
 * @api
 */
ol.proj.Projection.prototype.getWorldExtent = function() {
  return this.worldExtent_;
};


/**
 * Get the axis orientation of this projection.
 * Example values are:
 * enu - the default easting, northing, elevation.
 * neu - northing, easting, up - useful for "lat/long" geographic coordinates,
 *     or south orientated transverse mercator.
 * wnu - westing, northing, up - some planetary coordinate systems have
 *     "west positive" coordinate systems
 * @return {string} Axis orientation.
 */
ol.proj.Projection.prototype.getAxisOrientation = function() {
  return this.axisOrientation_;
};


/**
 * Is this projection a global projection which spans the whole world?
 * @return {boolean} Whether the projection is global.
 * @api stable
 */
ol.proj.Projection.prototype.isGlobal = function() {
  return this.global_;
};


/**
* Set if the projection is a global projection which spans the whole world
* @param {boolean} global Whether the projection is global.
* @api stable
*/
ol.proj.Projection.prototype.setGlobal = function(global) {
  this.global_ = global;
  this.canWrapX_ = !!(global && this.extent_);
};


/**
 * @return {ol.tilegrid.TileGrid} The default tile grid.
 */
ol.proj.Projection.prototype.getDefaultTileGrid = function() {
  return this.defaultTileGrid_;
};


/**
 * @param {ol.tilegrid.TileGrid} tileGrid The default tile grid.
 */
ol.proj.Projection.prototype.setDefaultTileGrid = function(tileGrid) {
  this.defaultTileGrid_ = tileGrid;
};


/**
 * Set the validity extent for this projection.
 * @param {ol.Extent} extent Extent.
 * @api stable
 */
ol.proj.Projection.prototype.setExtent = function(extent) {
  this.extent_ = extent;
  this.canWrapX_ = !!(this.global_ && extent);
};


/**
 * Set the world extent for this projection.
 * @param {ol.Extent} worldExtent World extent
 *     [minlon, minlat, maxlon, maxlat].
 * @api
 */
ol.proj.Projection.prototype.setWorldExtent = function(worldExtent) {
  this.worldExtent_ = worldExtent;
};


/**
* Set the getPointResolution function for this projection.
* @param {function(number, ol.Coordinate):number} func Function
* @api
*/
ol.proj.Projection.prototype.setGetPointResolution = function(func) {
  this.getPointResolutionFunc_ = func;
};


/**
* Default version.
* Get the resolution of the point in degrees or distance units.
* For projections with degrees as the unit this will simply return the
* provided resolution. For other projections the point resolution is
* estimated by transforming the 'point' pixel to EPSG:4326,
* measuring its width and height on the normal sphere,
* and taking the average of the width and height.
* @param {number} resolution Nominal resolution in projection units.
* @param {ol.Coordinate} point Point to find adjusted resolution at.
* @return {number} Point resolution at point in projection units.
* @private
*/
ol.proj.Projection.prototype.getPointResolution_ = function(resolution, point) {
  var units = this.getUnits();
  if (units == ol.proj.Units.DEGREES) {
    return resolution;
  } else {
    // Estimate point resolution by transforming the center pixel to EPSG:4326,
    // measuring its width and height on the normal sphere, and taking the
    // average of the width and height.
    var toEPSG4326 = ol.proj.getTransformFromProjections(
        this, ol.proj.get('EPSG:4326'));
    var vertices = [
      point[0] - resolution / 2, point[1],
      point[0] + resolution / 2, point[1],
      point[0], point[1] - resolution / 2,
      point[0], point[1] + resolution / 2
    ];
    vertices = toEPSG4326(vertices, vertices, 2);
    var width = ol.sphere.NORMAL.haversineDistance(
        vertices.slice(0, 2), vertices.slice(2, 4));
    var height = ol.sphere.NORMAL.haversineDistance(
        vertices.slice(4, 6), vertices.slice(6, 8));
    var pointResolution = (width + height) / 2;
    var metersPerUnit = this.getMetersPerUnit();
    if (metersPerUnit !== undefined) {
      pointResolution /= metersPerUnit;
    }
    return pointResolution;
  }
};


/**
 * Get the resolution of the point in degrees or distance units.
 * For projections with degrees as the unit this will simply return the
 * provided resolution. The default for other projections is to estimate
 * the point resolution by transforming the 'point' pixel to EPSG:4326,
 * measuring its width and height on the normal sphere,
 * and taking the average of the width and height.
 * An alternative implementation may be given when constructing a
 * projection. For many local projections,
 * such a custom function will return the resolution unchanged.
 * @param {number} resolution Resolution in projection units.
 * @param {ol.Coordinate} point Point.
 * @return {number} Point resolution in projection units.
 * @api
 */
ol.proj.Projection.prototype.getPointResolution = function(resolution, point) {
  return this.getPointResolutionFunc_(resolution, point);
};


/**
 * @private
 * @type {Object.<string, ol.proj.Projection>}
 */
ol.proj.projections_ = {};


/**
 * @private
 * @type {Object.<string, Object.<string, ol.TransformFunction>>}
 */
ol.proj.transforms_ = {};


/**
 * @private
 * @type {proj4}
 */
ol.proj.proj4_ = null;


if (ol.ENABLE_PROJ4JS) {
  /**
   * Register proj4. If not explicitly registered, it will be assumed that
   * proj4js will be loaded in the global namespace. For example in a
   * browserify ES6 environment you could use:
   *
   *     import ol from 'openlayers';
   *     import proj4 from 'proj4';
   *     ol.proj.setProj4(proj4);
   *
   * @param {proj4} proj4 Proj4.
   * @api
   */
  ol.proj.setProj4 = function(proj4) {
    goog.DEBUG && console.assert(typeof proj4 == 'function',
        'proj4 argument should be a function');
    ol.proj.proj4_ = proj4;
  };
}


/**
 * Registers transformation functions that don't alter coordinates. Those allow
 * to transform between projections with equal meaning.
 *
 * @param {Array.<ol.proj.Projection>} projections Projections.
 * @api
 */
ol.proj.addEquivalentProjections = function(projections) {
  ol.proj.addProjections(projections);
  projections.forEach(function(source) {
    projections.forEach(function(destination) {
      if (source !== destination) {
        ol.proj.addTransform(source, destination, ol.proj.cloneTransform);
      }
    });
  });
};


/**
 * Registers transformation functions to convert coordinates in any projection
 * in projection1 to any projection in projection2.
 *
 * @param {Array.<ol.proj.Projection>} projections1 Projections with equal
 *     meaning.
 * @param {Array.<ol.proj.Projection>} projections2 Projections with equal
 *     meaning.
 * @param {ol.TransformFunction} forwardTransform Transformation from any
 *   projection in projection1 to any projection in projection2.
 * @param {ol.TransformFunction} inverseTransform Transform from any projection
 *   in projection2 to any projection in projection1..
 */
ol.proj.addEquivalentTransforms = function(projections1, projections2, forwardTransform, inverseTransform) {
  projections1.forEach(function(projection1) {
    projections2.forEach(function(projection2) {
      ol.proj.addTransform(projection1, projection2, forwardTransform);
      ol.proj.addTransform(projection2, projection1, inverseTransform);
    });
  });
};


/**
 * Add a Projection object to the list of supported projections that can be
 * looked up by their code.
 *
 * @param {ol.proj.Projection} projection Projection instance.
 * @api stable
 */
ol.proj.addProjection = function(projection) {
  ol.proj.projections_[projection.getCode()] = projection;
  ol.proj.addTransform(projection, projection, ol.proj.cloneTransform);
};


/**
 * @param {Array.<ol.proj.Projection>} projections Projections.
 */
ol.proj.addProjections = function(projections) {
  var addedProjections = [];
  projections.forEach(function(projection) {
    addedProjections.push(ol.proj.addProjection(projection));
  });
};


/**
 * FIXME empty description for jsdoc
 */
ol.proj.clearAllProjections = function() {
  ol.proj.projections_ = {};
  ol.proj.transforms_ = {};
};


/**
 * @param {ol.proj.Projection|string|undefined} projection Projection.
 * @param {string} defaultCode Default code.
 * @return {ol.proj.Projection} Projection.
 */
ol.proj.createProjection = function(projection, defaultCode) {
  if (!projection) {
    return ol.proj.get(defaultCode);
  } else if (typeof projection === 'string') {
    return ol.proj.get(projection);
  } else {
    return /** @type {ol.proj.Projection} */ (projection);
  }
};


/**
 * Registers a conversion function to convert coordinates from the source
 * projection to the destination projection.
 *
 * @param {ol.proj.Projection} source Source.
 * @param {ol.proj.Projection} destination Destination.
 * @param {ol.TransformFunction} transformFn Transform.
 */
ol.proj.addTransform = function(source, destination, transformFn) {
  var sourceCode = source.getCode();
  var destinationCode = destination.getCode();
  var transforms = ol.proj.transforms_;
  if (!(sourceCode in transforms)) {
    transforms[sourceCode] = {};
  }
  transforms[sourceCode][destinationCode] = transformFn;
};


/**
 * Registers coordinate transform functions to convert coordinates between the
 * source projection and the destination projection.
 * The forward and inverse functions convert coordinate pairs; this function
 * converts these into the functions used internally which also handle
 * extents and coordinate arrays.
 *
 * @param {ol.ProjectionLike} source Source projection.
 * @param {ol.ProjectionLike} destination Destination projection.
 * @param {function(ol.Coordinate): ol.Coordinate} forward The forward transform
 *     function (that is, from the source projection to the destination
 *     projection) that takes a {@link ol.Coordinate} as argument and returns
 *     the transformed {@link ol.Coordinate}.
 * @param {function(ol.Coordinate): ol.Coordinate} inverse The inverse transform
 *     function (that is, from the destination projection to the source
 *     projection) that takes a {@link ol.Coordinate} as argument and returns
 *     the transformed {@link ol.Coordinate}.
 * @api stable
 */
ol.proj.addCoordinateTransforms = function(source, destination, forward, inverse) {
  var sourceProj = ol.proj.get(source);
  var destProj = ol.proj.get(destination);
  ol.proj.addTransform(sourceProj, destProj,
      ol.proj.createTransformFromCoordinateTransform(forward));
  ol.proj.addTransform(destProj, sourceProj,
      ol.proj.createTransformFromCoordinateTransform(inverse));
};


/**
 * Creates a {@link ol.TransformFunction} from a simple 2D coordinate transform
 * function.
 * @param {function(ol.Coordinate): ol.Coordinate} transform Coordinate
 *     transform.
 * @return {ol.TransformFunction} Transform function.
 */
ol.proj.createTransformFromCoordinateTransform = function(transform) {
  return (
      /**
       * @param {Array.<number>} input Input.
       * @param {Array.<number>=} opt_output Output.
       * @param {number=} opt_dimension Dimension.
       * @return {Array.<number>} Output.
       */
      function(input, opt_output, opt_dimension) {
        var length = input.length;
        var dimension = opt_dimension !== undefined ? opt_dimension : 2;
        var output = opt_output !== undefined ? opt_output : new Array(length);
        var point, i, j;
        for (i = 0; i < length; i += dimension) {
          point = transform([input[i], input[i + 1]]);
          output[i] = point[0];
          output[i + 1] = point[1];
          for (j = dimension - 1; j >= 2; --j) {
            output[i + j] = input[i + j];
          }
        }
        return output;
      });
};


/**
 * Unregisters the conversion function to convert coordinates from the source
 * projection to the destination projection.  This method is used to clean up
 * cached transforms during testing.
 *
 * @param {ol.proj.Projection} source Source projection.
 * @param {ol.proj.Projection} destination Destination projection.
 * @return {ol.TransformFunction} transformFn The unregistered transform.
 */
ol.proj.removeTransform = function(source, destination) {
  var sourceCode = source.getCode();
  var destinationCode = destination.getCode();
  var transforms = ol.proj.transforms_;
  goog.DEBUG && console.assert(sourceCode in transforms,
      'sourceCode should be in transforms');
  goog.DEBUG && console.assert(destinationCode in transforms[sourceCode],
      'destinationCode should be in transforms of sourceCode');
  var transform = transforms[sourceCode][destinationCode];
  delete transforms[sourceCode][destinationCode];
  if (ol.obj.isEmpty(transforms[sourceCode])) {
    delete transforms[sourceCode];
  }
  return transform;
};


/**
 * Transforms a coordinate from longitude/latitude to a different projection.
 * @param {ol.Coordinate} coordinate Coordinate as longitude and latitude, i.e.
 *     an array with longitude as 1st and latitude as 2nd element.
 * @param {ol.ProjectionLike=} opt_projection Target projection. The
 *     default is Web Mercator, i.e. 'EPSG:3857'.
 * @return {ol.Coordinate} Coordinate projected to the target projection.
 * @api stable
 */
ol.proj.fromLonLat = function(coordinate, opt_projection) {
  return ol.proj.transform(coordinate, 'EPSG:4326',
      opt_projection !== undefined ? opt_projection : 'EPSG:3857');
};


/**
 * Transforms a coordinate to longitude/latitude.
 * @param {ol.Coordinate} coordinate Projected coordinate.
 * @param {ol.ProjectionLike=} opt_projection Projection of the coordinate.
 *     The default is Web Mercator, i.e. 'EPSG:3857'.
 * @return {ol.Coordinate} Coordinate as longitude and latitude, i.e. an array
 *     with longitude as 1st and latitude as 2nd element.
 * @api stable
 */
ol.proj.toLonLat = function(coordinate, opt_projection) {
  return ol.proj.transform(coordinate,
      opt_projection !== undefined ? opt_projection : 'EPSG:3857', 'EPSG:4326');
};


/**
 * Fetches a Projection object for the code specified.
 *
 * @param {ol.ProjectionLike} projectionLike Either a code string which is
 *     a combination of authority and identifier such as "EPSG:4326", or an
 *     existing projection object, or undefined.
 * @return {ol.proj.Projection} Projection object, or null if not in list.
 * @api stable
 */
ol.proj.get = function(projectionLike) {
  var projection;
  if (projectionLike instanceof ol.proj.Projection) {
    projection = projectionLike;
  } else if (typeof projectionLike === 'string') {
    var code = projectionLike;
    projection = ol.proj.projections_[code];
    if (ol.ENABLE_PROJ4JS) {
      var proj4js = ol.proj.proj4_ || ol.global['proj4'];
      if (projection === undefined && typeof proj4js == 'function' &&
          proj4js.defs(code) !== undefined) {
        projection = new ol.proj.Projection({code: code});
        ol.proj.addProjection(projection);
      }
    }
  }
  return projection || null;
};


/**
 * Checks if two projections are the same, that is every coordinate in one
 * projection does represent the same geographic point as the same coordinate in
 * the other projection.
 *
 * @param {ol.proj.Projection} projection1 Projection 1.
 * @param {ol.proj.Projection} projection2 Projection 2.
 * @return {boolean} Equivalent.
 * @api
 */
ol.proj.equivalent = function(projection1, projection2) {
  if (projection1 === projection2) {
    return true;
  }
  var equalUnits = projection1.getUnits() === projection2.getUnits();
  if (projection1.getCode() === projection2.getCode()) {
    return equalUnits;
  } else {
    var transformFn = ol.proj.getTransformFromProjections(
        projection1, projection2);
    return transformFn === ol.proj.cloneTransform && equalUnits;
  }
};


/**
 * Given the projection-like objects, searches for a transformation
 * function to convert a coordinates array from the source projection to the
 * destination projection.
 *
 * @param {ol.ProjectionLike} source Source.
 * @param {ol.ProjectionLike} destination Destination.
 * @return {ol.TransformFunction} Transform function.
 * @api stable
 */
ol.proj.getTransform = function(source, destination) {
  var sourceProjection = ol.proj.get(source);
  var destinationProjection = ol.proj.get(destination);
  return ol.proj.getTransformFromProjections(
      sourceProjection, destinationProjection);
};


/**
 * Searches in the list of transform functions for the function for converting
 * coordinates from the source projection to the destination projection.
 *
 * @param {ol.proj.Projection} sourceProjection Source Projection object.
 * @param {ol.proj.Projection} destinationProjection Destination Projection
 *     object.
 * @return {ol.TransformFunction} Transform function.
 */
ol.proj.getTransformFromProjections = function(sourceProjection, destinationProjection) {
  var transforms = ol.proj.transforms_;
  var sourceCode = sourceProjection.getCode();
  var destinationCode = destinationProjection.getCode();
  var transform;
  if (sourceCode in transforms && destinationCode in transforms[sourceCode]) {
    transform = transforms[sourceCode][destinationCode];
  }
  if (transform === undefined) {
    goog.DEBUG && console.assert(transform !== undefined, 'transform should be defined');
    transform = ol.proj.identityTransform;
  }
  return transform;
};


/**
 * @param {Array.<number>} input Input coordinate array.
 * @param {Array.<number>=} opt_output Output array of coordinate values.
 * @param {number=} opt_dimension Dimension.
 * @return {Array.<number>} Input coordinate array (same array as input).
 */
ol.proj.identityTransform = function(input, opt_output, opt_dimension) {
  if (opt_output !== undefined && input !== opt_output) {
    // TODO: consider making this a warning instead
    goog.DEBUG && console.assert(false, 'This should not be used internally.');
    for (var i = 0, ii = input.length; i < ii; ++i) {
      opt_output[i] = input[i];
    }
    input = opt_output;
  }
  return input;
};


/**
 * @param {Array.<number>} input Input coordinate array.
 * @param {Array.<number>=} opt_output Output array of coordinate values.
 * @param {number=} opt_dimension Dimension.
 * @return {Array.<number>} Output coordinate array (new array, same coordinate
 *     values).
 */
ol.proj.cloneTransform = function(input, opt_output, opt_dimension) {
  var output;
  if (opt_output !== undefined) {
    for (var i = 0, ii = input.length; i < ii; ++i) {
      opt_output[i] = input[i];
    }
    output = opt_output;
  } else {
    output = input.slice();
  }
  return output;
};


/**
 * Transforms a coordinate from source projection to destination projection.
 * This returns a new coordinate (and does not modify the original).
 *
 * See {@link ol.proj.transformExtent} for extent transformation.
 * See the transform method of {@link ol.geom.Geometry} and its subclasses for
 * geometry transforms.
 *
 * @param {ol.Coordinate} coordinate Coordinate.
 * @param {ol.ProjectionLike} source Source projection-like.
 * @param {ol.ProjectionLike} destination Destination projection-like.
 * @return {ol.Coordinate} Coordinate.
 * @api stable
 */
ol.proj.transform = function(coordinate, source, destination) {
  var transformFn = ol.proj.getTransform(source, destination);
  return transformFn(coordinate, undefined, coordinate.length);
};


/**
 * Transforms an extent from source projection to destination projection.  This
 * returns a new extent (and does not modify the original).
 *
 * @param {ol.Extent} extent The extent to transform.
 * @param {ol.ProjectionLike} source Source projection-like.
 * @param {ol.ProjectionLike} destination Destination projection-like.
 * @return {ol.Extent} The transformed extent.
 * @api stable
 */
ol.proj.transformExtent = function(extent, source, destination) {
  var transformFn = ol.proj.getTransform(source, destination);
  return ol.extent.applyTransform(extent, transformFn);
};


/**
 * Transforms the given point to the destination projection.
 *
 * @param {ol.Coordinate} point Point.
 * @param {ol.proj.Projection} sourceProjection Source projection.
 * @param {ol.proj.Projection} destinationProjection Destination projection.
 * @return {ol.Coordinate} Point.
 */
ol.proj.transformWithProjections = function(point, sourceProjection, destinationProjection) {
  var transformFn = ol.proj.getTransformFromProjections(
      sourceProjection, destinationProjection);
  return transformFn(point);
};

goog.provide('ol.geom.Geometry');
goog.provide('ol.geom.GeometryLayout');
goog.provide('ol.geom.GeometryType');

goog.require('ol');
goog.require('ol.functions');
goog.require('ol.Object');
goog.require('ol.extent');
goog.require('ol.proj');
goog.require('ol.proj.Units');


/**
 * The geometry type. One of `'Point'`, `'LineString'`, `'LinearRing'`,
 * `'Polygon'`, `'MultiPoint'`, `'MultiLineString'`, `'MultiPolygon'`,
 * `'GeometryCollection'`, `'Circle'`.
 * @enum {string}
 */
ol.geom.GeometryType = {
  POINT: 'Point',
  LINE_STRING: 'LineString',
  LINEAR_RING: 'LinearRing',
  POLYGON: 'Polygon',
  MULTI_POINT: 'MultiPoint',
  MULTI_LINE_STRING: 'MultiLineString',
  MULTI_POLYGON: 'MultiPolygon',
  GEOMETRY_COLLECTION: 'GeometryCollection',
  CIRCLE: 'Circle'
};


/**
 * The coordinate layout for geometries, indicating whether a 3rd or 4th z ('Z')
 * or measure ('M') coordinate is available. Supported values are `'XY'`,
 * `'XYZ'`, `'XYM'`, `'XYZM'`.
 * @enum {string}
 */
ol.geom.GeometryLayout = {
  XY: 'XY',
  XYZ: 'XYZ',
  XYM: 'XYM',
  XYZM: 'XYZM'
};


/**
 * @classdesc
 * Abstract base class; normally only used for creating subclasses and not
 * instantiated in apps.
 * Base class for vector geometries.
 *
 * To get notified of changes to the geometry, register a listener for the
 * generic `change` event on your geometry instance.
 *
 * @constructor
 * @extends {ol.Object}
 * @api stable
 */
ol.geom.Geometry = function() {

  ol.Object.call(this);

  /**
   * @private
   * @type {ol.Extent}
   */
  this.extent_ = ol.extent.createEmpty();

  /**
   * @private
   * @type {number}
   */
  this.extentRevision_ = -1;

  /**
   * @protected
   * @type {Object.<string, ol.geom.Geometry>}
   */
  this.simplifiedGeometryCache = {};

  /**
   * @protected
   * @type {number}
   */
  this.simplifiedGeometryMaxMinSquaredTolerance = 0;

  /**
   * @protected
   * @type {number}
   */
  this.simplifiedGeometryRevision = 0;

};
ol.inherits(ol.geom.Geometry, ol.Object);


/**
 * Make a complete copy of the geometry.
 * @abstract
 * @return {!ol.geom.Geometry} Clone.
 */
ol.geom.Geometry.prototype.clone = function() {};


/**
 * @abstract
 * @param {number} x X.
 * @param {number} y Y.
 * @param {ol.Coordinate} closestPoint Closest point.
 * @param {number} minSquaredDistance Minimum squared distance.
 * @return {number} Minimum squared distance.
 */
ol.geom.Geometry.prototype.closestPointXY = function(x, y, closestPoint, minSquaredDistance) {};


/**
 * Return the closest point of the geometry to the passed point as
 * {@link ol.Coordinate coordinate}.
 * @param {ol.Coordinate} point Point.
 * @param {ol.Coordinate=} opt_closestPoint Closest point.
 * @return {ol.Coordinate} Closest point.
 * @api stable
 */
ol.geom.Geometry.prototype.getClosestPoint = function(point, opt_closestPoint) {
  var closestPoint = opt_closestPoint ? opt_closestPoint : [NaN, NaN];
  this.closestPointXY(point[0], point[1], closestPoint, Infinity);
  return closestPoint;
};


/**
 * Returns true if this geometry includes the specified coordinate. If the
 * coordinate is on the boundary of the geometry, returns false.
 * @param {ol.Coordinate} coordinate Coordinate.
 * @return {boolean} Contains coordinate.
 * @api
 */
ol.geom.Geometry.prototype.intersectsCoordinate = function(coordinate) {
  return this.containsXY(coordinate[0], coordinate[1]);
};


/**
 * @abstract
 * @param {ol.Extent} extent Extent.
 * @protected
 * @return {ol.Extent} extent Extent.
 */
ol.geom.Geometry.prototype.computeExtent = function(extent) {};


/**
 * @param {number} x X.
 * @param {number} y Y.
 * @return {boolean} Contains (x, y).
 */
ol.geom.Geometry.prototype.containsXY = ol.functions.FALSE;


/**
 * Get the extent of the geometry.
 * @param {ol.Extent=} opt_extent Extent.
 * @return {ol.Extent} extent Extent.
 * @api stable
 */
ol.geom.Geometry.prototype.getExtent = function(opt_extent) {
  if (this.extentRevision_ != this.getRevision()) {
    this.extent_ = this.computeExtent(this.extent_);
    this.extentRevision_ = this.getRevision();
  }
  return ol.extent.returnOrUpdate(this.extent_, opt_extent);
};


/**
 * Rotate the geometry around a given coordinate. This modifies the geometry
 * coordinates in place.
 * @abstract
 * @param {number} angle Rotation angle in radians.
 * @param {ol.Coordinate} anchor The rotation center.
 * @api
 */
ol.geom.Geometry.prototype.rotate = function(angle, anchor) {};


/**
 * Scale the geometry (with an optional origin).  This modifies the geometry
 * coordinates in place.
 * @abstract
 * @param {number} sx The scaling factor in the x-direction.
 * @param {number=} opt_sy The scaling factor in the y-direction (defaults to
 *     sx).
 * @param {ol.Coordinate=} opt_anchor The scale origin (defaults to the center
 *     of the geometry extent).
 * @api
 */
ol.geom.Geometry.prototype.scale = function(sx, opt_sy, opt_anchor) {};


/**
 * Create a simplified version of this geometry.  For linestrings, this uses
 * the the {@link
 * https://en.wikipedia.org/wiki/Ramer-Douglas-Peucker_algorithm
 * Douglas Peucker} algorithm.  For polygons, a quantization-based
 * simplification is used to preserve topology.
 * @function
 * @param {number} tolerance The tolerance distance for simplification.
 * @return {ol.geom.Geometry} A new, simplified version of the original
 *     geometry.
 * @api
 */
ol.geom.Geometry.prototype.simplify = function(tolerance) {
  return this.getSimplifiedGeometry(tolerance * tolerance);
};


/**
 * Create a simplified version of this geometry using the Douglas Peucker
 * algorithm.
 * @see https://en.wikipedia.org/wiki/Ramer-Douglas-Peucker_algorithm
 * @abstract
 * @param {number} squaredTolerance Squared tolerance.
 * @return {ol.geom.Geometry} Simplified geometry.
 */
ol.geom.Geometry.prototype.getSimplifiedGeometry = function(squaredTolerance) {};


/**
 * Get the type of this geometry.
 * @abstract
 * @return {ol.geom.GeometryType} Geometry type.
 */
ol.geom.Geometry.prototype.getType = function() {};


/**
 * Apply a transform function to each coordinate of the geometry.
 * The geometry is modified in place.
 * If you do not want the geometry modified in place, first `clone()` it and
 * then use this function on the clone.
 * @abstract
 * @param {ol.TransformFunction} transformFn Transform.
 */
ol.geom.Geometry.prototype.applyTransform = function(transformFn) {};


/**
 * Test if the geometry and the passed extent intersect.
 * @abstract
 * @param {ol.Extent} extent Extent.
 * @return {boolean} `true` if the geometry and the extent intersect.
 */
ol.geom.Geometry.prototype.intersectsExtent = function(extent) {};


/**
 * Translate the geometry.  This modifies the geometry coordinates in place.  If
 * instead you want a new geometry, first `clone()` this geometry.
 * @abstract
 * @param {number} deltaX Delta X.
 * @param {number} deltaY Delta Y.
 */
ol.geom.Geometry.prototype.translate = function(deltaX, deltaY) {};


/**
 * Transform each coordinate of the geometry from one coordinate reference
 * system to another. The geometry is modified in place.
 * For example, a line will be transformed to a line and a circle to a circle.
 * If you do not want the geometry modified in place, first `clone()` it and
 * then use this function on the clone.
 *
 * @param {ol.ProjectionLike} source The current projection.  Can be a
 *     string identifier or a {@link ol.proj.Projection} object.
 * @param {ol.ProjectionLike} destination The desired projection.  Can be a
 *     string identifier or a {@link ol.proj.Projection} object.
 * @return {ol.geom.Geometry} This geometry.  Note that original geometry is
 *     modified in place.
 * @api stable
 */
ol.geom.Geometry.prototype.transform = function(source, destination) {
  goog.DEBUG && console.assert(
      ol.proj.get(source).getUnits() !== ol.proj.Units.TILE_PIXELS &&
      ol.proj.get(destination).getUnits() !== ol.proj.Units.TILE_PIXELS,
      'cannot transform geometries with TILE_PIXELS units');
  this.applyTransform(ol.proj.getTransform(source, destination));
  return this;
};

goog.provide('ol.geom.flat.transform');


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @param {ol.Transform} transform Transform.
 * @param {Array.<number>=} opt_dest Destination.
 * @return {Array.<number>} Transformed coordinates.
 */
ol.geom.flat.transform.transform2D = function(flatCoordinates, offset, end, stride, transform, opt_dest) {
  var dest = opt_dest ? opt_dest : [];
  var i = 0;
  var j;
  for (j = offset; j < end; j += stride) {
    var x = flatCoordinates[j];
    var y = flatCoordinates[j + 1];
    dest[i++] = transform[0] * x + transform[2] * y + transform[4];
    dest[i++] = transform[1] * x + transform[3] * y + transform[5];
  }
  if (opt_dest && dest.length != i) {
    dest.length = i;
  }
  return dest;
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @param {number} angle Angle.
 * @param {Array.<number>} anchor Rotation anchor point.
 * @param {Array.<number>=} opt_dest Destination.
 * @return {Array.<number>} Transformed coordinates.
 */
ol.geom.flat.transform.rotate = function(flatCoordinates, offset, end, stride, angle, anchor, opt_dest) {
  var dest = opt_dest ? opt_dest : [];
  var cos = Math.cos(angle);
  var sin = Math.sin(angle);
  var anchorX = anchor[0];
  var anchorY = anchor[1];
  var i = 0;
  for (var j = offset; j < end; j += stride) {
    var deltaX = flatCoordinates[j] - anchorX;
    var deltaY = flatCoordinates[j + 1] - anchorY;
    dest[i++] = anchorX + deltaX * cos - deltaY * sin;
    dest[i++] = anchorY + deltaX * sin + deltaY * cos;
    for (var k = j + 2; k < j + stride; ++k) {
      dest[i++] = flatCoordinates[k];
    }
  }
  if (opt_dest && dest.length != i) {
    dest.length = i;
  }
  return dest;
};


/**
 * Scale the coordinates.
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @param {number} sx Scale factor in the x-direction.
 * @param {number} sy Scale factor in the y-direction.
 * @param {Array.<number>} anchor Scale anchor point.
 * @param {Array.<number>=} opt_dest Destination.
 * @return {Array.<number>} Transformed coordinates.
 */
ol.geom.flat.transform.scale = function(flatCoordinates, offset, end, stride, sx, sy, anchor, opt_dest) {
  var dest = opt_dest ? opt_dest : [];
  var anchorX = anchor[0];
  var anchorY = anchor[1];
  var i = 0;
  for (var j = offset; j < end; j += stride) {
    var deltaX = flatCoordinates[j] - anchorX;
    var deltaY = flatCoordinates[j + 1] - anchorY;
    dest[i++] = anchorX + sx * deltaX;
    dest[i++] = anchorY + sy * deltaY;
    for (var k = j + 2; k < j + stride; ++k) {
      dest[i++] = flatCoordinates[k];
    }
  }
  if (opt_dest && dest.length != i) {
    dest.length = i;
  }
  return dest;
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @param {number} deltaX Delta X.
 * @param {number} deltaY Delta Y.
 * @param {Array.<number>=} opt_dest Destination.
 * @return {Array.<number>} Transformed coordinates.
 */
ol.geom.flat.transform.translate = function(flatCoordinates, offset, end, stride, deltaX, deltaY, opt_dest) {
  var dest = opt_dest ? opt_dest : [];
  var i = 0;
  var j, k;
  for (j = offset; j < end; j += stride) {
    dest[i++] = flatCoordinates[j] + deltaX;
    dest[i++] = flatCoordinates[j + 1] + deltaY;
    for (k = j + 2; k < j + stride; ++k) {
      dest[i++] = flatCoordinates[k];
    }
  }
  if (opt_dest && dest.length != i) {
    dest.length = i;
  }
  return dest;
};

goog.provide('ol.geom.SimpleGeometry');

goog.require('ol');
goog.require('ol.functions');
goog.require('ol.extent');
goog.require('ol.geom.Geometry');
goog.require('ol.geom.GeometryLayout');
goog.require('ol.geom.flat.transform');
goog.require('ol.obj');


/**
 * @classdesc
 * Abstract base class; only used for creating subclasses; do not instantiate
 * in apps, as cannot be rendered.
 *
 * @constructor
 * @extends {ol.geom.Geometry}
 * @api stable
 */
ol.geom.SimpleGeometry = function() {

  ol.geom.Geometry.call(this);

  /**
   * @protected
   * @type {ol.geom.GeometryLayout}
   */
  this.layout = ol.geom.GeometryLayout.XY;

  /**
   * @protected
   * @type {number}
   */
  this.stride = 2;

  /**
   * @protected
   * @type {Array.<number>}
   */
  this.flatCoordinates = null;

};
ol.inherits(ol.geom.SimpleGeometry, ol.geom.Geometry);


/**
 * @param {number} stride Stride.
 * @private
 * @return {ol.geom.GeometryLayout} layout Layout.
 */
ol.geom.SimpleGeometry.getLayoutForStride_ = function(stride) {
  var layout;
  if (stride == 2) {
    layout = ol.geom.GeometryLayout.XY;
  } else if (stride == 3) {
    layout = ol.geom.GeometryLayout.XYZ;
  } else if (stride == 4) {
    layout = ol.geom.GeometryLayout.XYZM;
  }
  goog.DEBUG && console.assert(layout, 'unsupported stride: ' + stride);
  return /** @type {ol.geom.GeometryLayout} */ (layout);
};


/**
 * @param {ol.geom.GeometryLayout} layout Layout.
 * @return {number} Stride.
 */
ol.geom.SimpleGeometry.getStrideForLayout = function(layout) {
  var stride;
  if (layout == ol.geom.GeometryLayout.XY) {
    stride = 2;
  } else if (layout == ol.geom.GeometryLayout.XYZ || layout == ol.geom.GeometryLayout.XYM) {
    stride = 3;
  } else if (layout == ol.geom.GeometryLayout.XYZM) {
    stride = 4;
  }
  goog.DEBUG && console.assert(stride, 'unsupported layout: ' + layout);
  return /** @type {number} */ (stride);
};


/**
 * @inheritDoc
 */
ol.geom.SimpleGeometry.prototype.containsXY = ol.functions.FALSE;


/**
 * @inheritDoc
 */
ol.geom.SimpleGeometry.prototype.computeExtent = function(extent) {
  return ol.extent.createOrUpdateFromFlatCoordinates(
      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,
      extent);
};


/**
 * @abstract
 * @return {Array} Coordinates.
 */
ol.geom.SimpleGeometry.prototype.getCoordinates = function() {};


/**
 * Return the first coordinate of the geometry.
 * @return {ol.Coordinate} First coordinate.
 * @api stable
 */
ol.geom.SimpleGeometry.prototype.getFirstCoordinate = function() {
  return this.flatCoordinates.slice(0, this.stride);
};


/**
 * @return {Array.<number>} Flat coordinates.
 */
ol.geom.SimpleGeometry.prototype.getFlatCoordinates = function() {
  return this.flatCoordinates;
};


/**
 * Return the last coordinate of the geometry.
 * @return {ol.Coordinate} Last point.
 * @api stable
 */
ol.geom.SimpleGeometry.prototype.getLastCoordinate = function() {
  return this.flatCoordinates.slice(this.flatCoordinates.length - this.stride);
};


/**
 * Return the {@link ol.geom.GeometryLayout layout} of the geometry.
 * @return {ol.geom.GeometryLayout} Layout.
 * @api stable
 */
ol.geom.SimpleGeometry.prototype.getLayout = function() {
  return this.layout;
};


/**
 * @inheritDoc
 */
ol.geom.SimpleGeometry.prototype.getSimplifiedGeometry = function(squaredTolerance) {
  if (this.simplifiedGeometryRevision != this.getRevision()) {
    ol.obj.clear(this.simplifiedGeometryCache);
    this.simplifiedGeometryMaxMinSquaredTolerance = 0;
    this.simplifiedGeometryRevision = this.getRevision();
  }
  // If squaredTolerance is negative or if we know that simplification will not
  // have any effect then just return this.
  if (squaredTolerance < 0 ||
      (this.simplifiedGeometryMaxMinSquaredTolerance !== 0 &&
       squaredTolerance <= this.simplifiedGeometryMaxMinSquaredTolerance)) {
    return this;
  }
  var key = squaredTolerance.toString();
  if (this.simplifiedGeometryCache.hasOwnProperty(key)) {
    return this.simplifiedGeometryCache[key];
  } else {
    var simplifiedGeometry =
        this.getSimplifiedGeometryInternal(squaredTolerance);
    var simplifiedFlatCoordinates = simplifiedGeometry.getFlatCoordinates();
    if (simplifiedFlatCoordinates.length < this.flatCoordinates.length) {
      this.simplifiedGeometryCache[key] = simplifiedGeometry;
      return simplifiedGeometry;
    } else {
      // Simplification did not actually remove any coordinates.  We now know
      // that any calls to getSimplifiedGeometry with a squaredTolerance less
      // than or equal to the current squaredTolerance will also not have any
      // effect.  This allows us to short circuit simplification (saving CPU
      // cycles) and prevents the cache of simplified geometries from filling
      // up with useless identical copies of this geometry (saving memory).
      this.simplifiedGeometryMaxMinSquaredTolerance = squaredTolerance;
      return this;
    }
  }
};


/**
 * @param {number} squaredTolerance Squared tolerance.
 * @return {ol.geom.SimpleGeometry} Simplified geometry.
 * @protected
 */
ol.geom.SimpleGeometry.prototype.getSimplifiedGeometryInternal = function(squaredTolerance) {
  return this;
};


/**
 * @return {number} Stride.
 */
ol.geom.SimpleGeometry.prototype.getStride = function() {
  return this.stride;
};


/**
 * @param {ol.geom.GeometryLayout} layout Layout.
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @protected
 */
ol.geom.SimpleGeometry.prototype.setFlatCoordinatesInternal = function(layout, flatCoordinates) {
  this.stride = ol.geom.SimpleGeometry.getStrideForLayout(layout);
  this.layout = layout;
  this.flatCoordinates = flatCoordinates;
};


/**
 * @abstract
 * @param {Array} coordinates Coordinates.
 * @param {ol.geom.GeometryLayout=} opt_layout Layout.
 */
ol.geom.SimpleGeometry.prototype.setCoordinates = function(coordinates, opt_layout) {};


/**
 * @param {ol.geom.GeometryLayout|undefined} layout Layout.
 * @param {Array} coordinates Coordinates.
 * @param {number} nesting Nesting.
 * @protected
 */
ol.geom.SimpleGeometry.prototype.setLayout = function(layout, coordinates, nesting) {
  /** @type {number} */
  var stride;
  if (layout) {
    stride = ol.geom.SimpleGeometry.getStrideForLayout(layout);
  } else {
    var i;
    for (i = 0; i < nesting; ++i) {
      if (coordinates.length === 0) {
        this.layout = ol.geom.GeometryLayout.XY;
        this.stride = 2;
        return;
      } else {
        coordinates = /** @type {Array} */ (coordinates[0]);
      }
    }
    stride = coordinates.length;
    layout = ol.geom.SimpleGeometry.getLayoutForStride_(stride);
  }
  this.layout = layout;
  this.stride = stride;
};


/**
 * @inheritDoc
 * @api stable
 */
ol.geom.SimpleGeometry.prototype.applyTransform = function(transformFn) {
  if (this.flatCoordinates) {
    transformFn(this.flatCoordinates, this.flatCoordinates, this.stride);
    this.changed();
  }
};


/**
 * @inheritDoc
 * @api
 */
ol.geom.SimpleGeometry.prototype.rotate = function(angle, anchor) {
  var flatCoordinates = this.getFlatCoordinates();
  if (flatCoordinates) {
    var stride = this.getStride();
    ol.geom.flat.transform.rotate(
        flatCoordinates, 0, flatCoordinates.length,
        stride, angle, anchor, flatCoordinates);
    this.changed();
  }
};


/**
 * @inheritDoc
 * @api
 */
ol.geom.SimpleGeometry.prototype.scale = function(sx, opt_sy, opt_anchor) {
  var sy = opt_sy;
  if (sy === undefined) {
    sy = sx;
  }
  var anchor = opt_anchor;
  if (!anchor) {
    anchor = ol.extent.getCenter(this.getExtent());
  }
  var flatCoordinates = this.getFlatCoordinates();
  if (flatCoordinates) {
    var stride = this.getStride();
    ol.geom.flat.transform.scale(
        flatCoordinates, 0, flatCoordinates.length,
        stride, sx, sy, anchor, flatCoordinates);
    this.changed();
  }
};


/**
 * @inheritDoc
 * @api stable
 */
ol.geom.SimpleGeometry.prototype.translate = function(deltaX, deltaY) {
  var flatCoordinates = this.getFlatCoordinates();
  if (flatCoordinates) {
    var stride = this.getStride();
    ol.geom.flat.transform.translate(
        flatCoordinates, 0, flatCoordinates.length, stride,
        deltaX, deltaY, flatCoordinates);
    this.changed();
  }
};


/**
 * @param {ol.geom.SimpleGeometry} simpleGeometry Simple geometry.
 * @param {ol.Transform} transform Transform.
 * @param {Array.<number>=} opt_dest Destination.
 * @return {Array.<number>} Transformed flat coordinates.
 */
ol.geom.SimpleGeometry.transform2D = function(simpleGeometry, transform, opt_dest) {
  var flatCoordinates = simpleGeometry.getFlatCoordinates();
  if (!flatCoordinates) {
    return null;
  } else {
    var stride = simpleGeometry.getStride();
    return ol.geom.flat.transform.transform2D(
        flatCoordinates, 0, flatCoordinates.length, stride,
        transform, opt_dest);
  }
};

goog.provide('ol.geom.flat.area');


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @return {number} Area.
 */
ol.geom.flat.area.linearRing = function(flatCoordinates, offset, end, stride) {
  var twiceArea = 0;
  var x1 = flatCoordinates[end - stride];
  var y1 = flatCoordinates[end - stride + 1];
  for (; offset < end; offset += stride) {
    var x2 = flatCoordinates[offset];
    var y2 = flatCoordinates[offset + 1];
    twiceArea += y1 * x2 - x1 * y2;
    x1 = x2;
    y1 = y2;
  }
  return twiceArea / 2;
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array.<number>} ends Ends.
 * @param {number} stride Stride.
 * @return {number} Area.
 */
ol.geom.flat.area.linearRings = function(flatCoordinates, offset, ends, stride) {
  var area = 0;
  var i, ii;
  for (i = 0, ii = ends.length; i < ii; ++i) {
    var end = ends[i];
    area += ol.geom.flat.area.linearRing(flatCoordinates, offset, end, stride);
    offset = end;
  }
  return area;
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array.<Array.<number>>} endss Endss.
 * @param {number} stride Stride.
 * @return {number} Area.
 */
ol.geom.flat.area.linearRingss = function(flatCoordinates, offset, endss, stride) {
  var area = 0;
  var i, ii;
  for (i = 0, ii = endss.length; i < ii; ++i) {
    var ends = endss[i];
    area +=
        ol.geom.flat.area.linearRings(flatCoordinates, offset, ends, stride);
    offset = ends[ends.length - 1];
  }
  return area;
};

goog.provide('ol.geom.flat.closest');

goog.require('ol.math');


/**
 * Returns the point on the 2D line segment flatCoordinates[offset1] to
 * flatCoordinates[offset2] that is closest to the point (x, y).  Extra
 * dimensions are linearly interpolated.
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset1 Offset 1.
 * @param {number} offset2 Offset 2.
 * @param {number} stride Stride.
 * @param {number} x X.
 * @param {number} y Y.
 * @param {Array.<number>} closestPoint Closest point.
 */
ol.geom.flat.closest.point = function(flatCoordinates, offset1, offset2, stride, x, y, closestPoint) {
  var x1 = flatCoordinates[offset1];
  var y1 = flatCoordinates[offset1 + 1];
  var dx = flatCoordinates[offset2] - x1;
  var dy = flatCoordinates[offset2 + 1] - y1;
  var i, offset;
  if (dx === 0 && dy === 0) {
    offset = offset1;
  } else {
    var t = ((x - x1) * dx + (y - y1) * dy) / (dx * dx + dy * dy);
    if (t > 1) {
      offset = offset2;
    } else if (t > 0) {
      for (i = 0; i < stride; ++i) {
        closestPoint[i] = ol.math.lerp(flatCoordinates[offset1 + i],
            flatCoordinates[offset2 + i], t);
      }
      closestPoint.length = stride;
      return;
    } else {
      offset = offset1;
    }
  }
  for (i = 0; i < stride; ++i) {
    closestPoint[i] = flatCoordinates[offset + i];
  }
  closestPoint.length = stride;
};


/**
 * Return the squared of the largest distance between any pair of consecutive
 * coordinates.
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @param {number} maxSquaredDelta Max squared delta.
 * @return {number} Max squared delta.
 */
ol.geom.flat.closest.getMaxSquaredDelta = function(flatCoordinates, offset, end, stride, maxSquaredDelta) {
  var x1 = flatCoordinates[offset];
  var y1 = flatCoordinates[offset + 1];
  for (offset += stride; offset < end; offset += stride) {
    var x2 = flatCoordinates[offset];
    var y2 = flatCoordinates[offset + 1];
    var squaredDelta = ol.math.squaredDistance(x1, y1, x2, y2);
    if (squaredDelta > maxSquaredDelta) {
      maxSquaredDelta = squaredDelta;
    }
    x1 = x2;
    y1 = y2;
  }
  return maxSquaredDelta;
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array.<number>} ends Ends.
 * @param {number} stride Stride.
 * @param {number} maxSquaredDelta Max squared delta.
 * @return {number} Max squared delta.
 */
ol.geom.flat.closest.getsMaxSquaredDelta = function(flatCoordinates, offset, ends, stride, maxSquaredDelta) {
  var i, ii;
  for (i = 0, ii = ends.length; i < ii; ++i) {
    var end = ends[i];
    maxSquaredDelta = ol.geom.flat.closest.getMaxSquaredDelta(
        flatCoordinates, offset, end, stride, maxSquaredDelta);
    offset = end;
  }
  return maxSquaredDelta;
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array.<Array.<number>>} endss Endss.
 * @param {number} stride Stride.
 * @param {number} maxSquaredDelta Max squared delta.
 * @return {number} Max squared delta.
 */
ol.geom.flat.closest.getssMaxSquaredDelta = function(flatCoordinates, offset, endss, stride, maxSquaredDelta) {
  var i, ii;
  for (i = 0, ii = endss.length; i < ii; ++i) {
    var ends = endss[i];
    maxSquaredDelta = ol.geom.flat.closest.getsMaxSquaredDelta(
        flatCoordinates, offset, ends, stride, maxSquaredDelta);
    offset = ends[ends.length - 1];
  }
  return maxSquaredDelta;
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @param {number} maxDelta Max delta.
 * @param {boolean} isRing Is ring.
 * @param {number} x X.
 * @param {number} y Y.
 * @param {Array.<number>} closestPoint Closest point.
 * @param {number} minSquaredDistance Minimum squared distance.
 * @param {Array.<number>=} opt_tmpPoint Temporary point object.
 * @return {number} Minimum squared distance.
 */
ol.geom.flat.closest.getClosestPoint = function(flatCoordinates, offset, end,
    stride, maxDelta, isRing, x, y, closestPoint, minSquaredDistance,
    opt_tmpPoint) {
  if (offset == end) {
    return minSquaredDistance;
  }
  var i, squaredDistance;
  if (maxDelta === 0) {
    // All points are identical, so just test the first point.
    squaredDistance = ol.math.squaredDistance(
        x, y, flatCoordinates[offset], flatCoordinates[offset + 1]);
    if (squaredDistance < minSquaredDistance) {
      for (i = 0; i < stride; ++i) {
        closestPoint[i] = flatCoordinates[offset + i];
      }
      closestPoint.length = stride;
      return squaredDistance;
    } else {
      return minSquaredDistance;
    }
  }
  goog.DEBUG && console.assert(maxDelta > 0, 'maxDelta should be larger than 0');
  var tmpPoint = opt_tmpPoint ? opt_tmpPoint : [NaN, NaN];
  var index = offset + stride;
  while (index < end) {
    ol.geom.flat.closest.point(
        flatCoordinates, index - stride, index, stride, x, y, tmpPoint);
    squaredDistance = ol.math.squaredDistance(x, y, tmpPoint[0], tmpPoint[1]);
    if (squaredDistance < minSquaredDistance) {
      minSquaredDistance = squaredDistance;
      for (i = 0; i < stride; ++i) {
        closestPoint[i] = tmpPoint[i];
      }
      closestPoint.length = stride;
      index += stride;
    } else {
      // Skip ahead multiple points, because we know that all the skipped
      // points cannot be any closer than the closest point we have found so
      // far.  We know this because we know how close the current point is, how
      // close the closest point we have found so far is, and the maximum
      // distance between consecutive points.  For example, if we're currently
      // at distance 10, the best we've found so far is 3, and that the maximum
      // distance between consecutive points is 2, then we'll need to skip at
      // least (10 - 3) / 2 == 3 (rounded down) points to have any chance of
      // finding a closer point.  We use Math.max(..., 1) to ensure that we
      // always advance at least one point, to avoid an infinite loop.
      index += stride * Math.max(
          ((Math.sqrt(squaredDistance) -
            Math.sqrt(minSquaredDistance)) / maxDelta) | 0, 1);
    }
  }
  if (isRing) {
    // Check the closing segment.
    ol.geom.flat.closest.point(
        flatCoordinates, end - stride, offset, stride, x, y, tmpPoint);
    squaredDistance = ol.math.squaredDistance(x, y, tmpPoint[0], tmpPoint[1]);
    if (squaredDistance < minSquaredDistance) {
      minSquaredDistance = squaredDistance;
      for (i = 0; i < stride; ++i) {
        closestPoint[i] = tmpPoint[i];
      }
      closestPoint.length = stride;
    }
  }
  return minSquaredDistance;
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array.<number>} ends Ends.
 * @param {number} stride Stride.
 * @param {number} maxDelta Max delta.
 * @param {boolean} isRing Is ring.
 * @param {number} x X.
 * @param {number} y Y.
 * @param {Array.<number>} closestPoint Closest point.
 * @param {number} minSquaredDistance Minimum squared distance.
 * @param {Array.<number>=} opt_tmpPoint Temporary point object.
 * @return {number} Minimum squared distance.
 */
ol.geom.flat.closest.getsClosestPoint = function(flatCoordinates, offset, ends,
    stride, maxDelta, isRing, x, y, closestPoint, minSquaredDistance,
    opt_tmpPoint) {
  var tmpPoint = opt_tmpPoint ? opt_tmpPoint : [NaN, NaN];
  var i, ii;
  for (i = 0, ii = ends.length; i < ii; ++i) {
    var end = ends[i];
    minSquaredDistance = ol.geom.flat.closest.getClosestPoint(
        flatCoordinates, offset, end, stride,
        maxDelta, isRing, x, y, closestPoint, minSquaredDistance, tmpPoint);
    offset = end;
  }
  return minSquaredDistance;
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array.<Array.<number>>} endss Endss.
 * @param {number} stride Stride.
 * @param {number} maxDelta Max delta.
 * @param {boolean} isRing Is ring.
 * @param {number} x X.
 * @param {number} y Y.
 * @param {Array.<number>} closestPoint Closest point.
 * @param {number} minSquaredDistance Minimum squared distance.
 * @param {Array.<number>=} opt_tmpPoint Temporary point object.
 * @return {number} Minimum squared distance.
 */
ol.geom.flat.closest.getssClosestPoint = function(flatCoordinates, offset,
    endss, stride, maxDelta, isRing, x, y, closestPoint, minSquaredDistance,
    opt_tmpPoint) {
  var tmpPoint = opt_tmpPoint ? opt_tmpPoint : [NaN, NaN];
  var i, ii;
  for (i = 0, ii = endss.length; i < ii; ++i) {
    var ends = endss[i];
    minSquaredDistance = ol.geom.flat.closest.getsClosestPoint(
        flatCoordinates, offset, ends, stride,
        maxDelta, isRing, x, y, closestPoint, minSquaredDistance, tmpPoint);
    offset = ends[ends.length - 1];
  }
  return minSquaredDistance;
};

goog.provide('ol.geom.flat.deflate');


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {ol.Coordinate} coordinate Coordinate.
 * @param {number} stride Stride.
 * @return {number} offset Offset.
 */
ol.geom.flat.deflate.coordinate = function(flatCoordinates, offset, coordinate, stride) {
  goog.DEBUG && console.assert(coordinate.length == stride,
      'length of the coordinate array should match stride');
  var i, ii;
  for (i = 0, ii = coordinate.length; i < ii; ++i) {
    flatCoordinates[offset++] = coordinate[i];
  }
  return offset;
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array.<ol.Coordinate>} coordinates Coordinates.
 * @param {number} stride Stride.
 * @return {number} offset Offset.
 */
ol.geom.flat.deflate.coordinates = function(flatCoordinates, offset, coordinates, stride) {
  var i, ii;
  for (i = 0, ii = coordinates.length; i < ii; ++i) {
    var coordinate = coordinates[i];
    goog.DEBUG && console.assert(coordinate.length == stride,
        'length of coordinate array should match stride');
    var j;
    for (j = 0; j < stride; ++j) {
      flatCoordinates[offset++] = coordinate[j];
    }
  }
  return offset;
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array.<Array.<ol.Coordinate>>} coordinatess Coordinatess.
 * @param {number} stride Stride.
 * @param {Array.<number>=} opt_ends Ends.
 * @return {Array.<number>} Ends.
 */
ol.geom.flat.deflate.coordinatess = function(flatCoordinates, offset, coordinatess, stride, opt_ends) {
  var ends = opt_ends ? opt_ends : [];
  var i = 0;
  var j, jj;
  for (j = 0, jj = coordinatess.length; j < jj; ++j) {
    var end = ol.geom.flat.deflate.coordinates(
        flatCoordinates, offset, coordinatess[j], stride);
    ends[i++] = end;
    offset = end;
  }
  ends.length = i;
  return ends;
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array.<Array.<Array.<ol.Coordinate>>>} coordinatesss Coordinatesss.
 * @param {number} stride Stride.
 * @param {Array.<Array.<number>>=} opt_endss Endss.
 * @return {Array.<Array.<number>>} Endss.
 */
ol.geom.flat.deflate.coordinatesss = function(flatCoordinates, offset, coordinatesss, stride, opt_endss) {
  var endss = opt_endss ? opt_endss : [];
  var i = 0;
  var j, jj;
  for (j = 0, jj = coordinatesss.length; j < jj; ++j) {
    var ends = ol.geom.flat.deflate.coordinatess(
        flatCoordinates, offset, coordinatesss[j], stride, endss[i]);
    endss[i++] = ends;
    offset = ends[ends.length - 1];
  }
  endss.length = i;
  return endss;
};

goog.provide('ol.geom.flat.inflate');


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @param {Array.<ol.Coordinate>=} opt_coordinates Coordinates.
 * @return {Array.<ol.Coordinate>} Coordinates.
 */
ol.geom.flat.inflate.coordinates = function(flatCoordinates, offset, end, stride, opt_coordinates) {
  var coordinates = opt_coordinates !== undefined ? opt_coordinates : [];
  var i = 0;
  var j;
  for (j = offset; j < end; j += stride) {
    coordinates[i++] = flatCoordinates.slice(j, j + stride);
  }
  coordinates.length = i;
  return coordinates;
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array.<number>} ends Ends.
 * @param {number} stride Stride.
 * @param {Array.<Array.<ol.Coordinate>>=} opt_coordinatess Coordinatess.
 * @return {Array.<Array.<ol.Coordinate>>} Coordinatess.
 */
ol.geom.flat.inflate.coordinatess = function(flatCoordinates, offset, ends, stride, opt_coordinatess) {
  var coordinatess = opt_coordinatess !== undefined ? opt_coordinatess : [];
  var i = 0;
  var j, jj;
  for (j = 0, jj = ends.length; j < jj; ++j) {
    var end = ends[j];
    coordinatess[i++] = ol.geom.flat.inflate.coordinates(
        flatCoordinates, offset, end, stride, coordinatess[i]);
    offset = end;
  }
  coordinatess.length = i;
  return coordinatess;
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array.<Array.<number>>} endss Endss.
 * @param {number} stride Stride.
 * @param {Array.<Array.<Array.<ol.Coordinate>>>=} opt_coordinatesss
 *     Coordinatesss.
 * @return {Array.<Array.<Array.<ol.Coordinate>>>} Coordinatesss.
 */
ol.geom.flat.inflate.coordinatesss = function(flatCoordinates, offset, endss, stride, opt_coordinatesss) {
  var coordinatesss = opt_coordinatesss !== undefined ? opt_coordinatesss : [];
  var i = 0;
  var j, jj;
  for (j = 0, jj = endss.length; j < jj; ++j) {
    var ends = endss[j];
    coordinatesss[i++] = ol.geom.flat.inflate.coordinatess(
        flatCoordinates, offset, ends, stride, coordinatesss[i]);
    offset = ends[ends.length - 1];
  }
  coordinatesss.length = i;
  return coordinatesss;
};

// Based on simplify-js https://github.com/mourner/simplify-js
// Copyright (c) 2012, Vladimir Agafonkin
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//    1. Redistributions of source code must retain the above copyright notice,
//       this list of conditions and the following disclaimer.
//
//    2. Redistributions in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in the
//       documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

goog.provide('ol.geom.flat.simplify');

goog.require('ol.math');


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @param {number} squaredTolerance Squared tolerance.
 * @param {boolean} highQuality Highest quality.
 * @param {Array.<number>=} opt_simplifiedFlatCoordinates Simplified flat
 *     coordinates.
 * @return {Array.<number>} Simplified line string.
 */
ol.geom.flat.simplify.lineString = function(flatCoordinates, offset, end,
    stride, squaredTolerance, highQuality, opt_simplifiedFlatCoordinates) {
  var simplifiedFlatCoordinates = opt_simplifiedFlatCoordinates !== undefined ?
      opt_simplifiedFlatCoordinates : [];
  if (!highQuality) {
    end = ol.geom.flat.simplify.radialDistance(flatCoordinates, offset, end,
        stride, squaredTolerance,
        simplifiedFlatCoordinates, 0);
    flatCoordinates = simplifiedFlatCoordinates;
    offset = 0;
    stride = 2;
  }
  simplifiedFlatCoordinates.length = ol.geom.flat.simplify.douglasPeucker(
      flatCoordinates, offset, end, stride, squaredTolerance,
      simplifiedFlatCoordinates, 0);
  return simplifiedFlatCoordinates;
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @param {number} squaredTolerance Squared tolerance.
 * @param {Array.<number>} simplifiedFlatCoordinates Simplified flat
 *     coordinates.
 * @param {number} simplifiedOffset Simplified offset.
 * @return {number} Simplified offset.
 */
ol.geom.flat.simplify.douglasPeucker = function(flatCoordinates, offset, end,
    stride, squaredTolerance, simplifiedFlatCoordinates, simplifiedOffset) {
  var n = (end - offset) / stride;
  if (n < 3) {
    for (; offset < end; offset += stride) {
      simplifiedFlatCoordinates[simplifiedOffset++] =
          flatCoordinates[offset];
      simplifiedFlatCoordinates[simplifiedOffset++] =
          flatCoordinates[offset + 1];
    }
    return simplifiedOffset;
  }
  /** @type {Array.<number>} */
  var markers = new Array(n);
  markers[0] = 1;
  markers[n - 1] = 1;
  /** @type {Array.<number>} */
  var stack = [offset, end - stride];
  var index = 0;
  var i;
  while (stack.length > 0) {
    var last = stack.pop();
    var first = stack.pop();
    var maxSquaredDistance = 0;
    var x1 = flatCoordinates[first];
    var y1 = flatCoordinates[first + 1];
    var x2 = flatCoordinates[last];
    var y2 = flatCoordinates[last + 1];
    for (i = first + stride; i < last; i += stride) {
      var x = flatCoordinates[i];
      var y = flatCoordinates[i + 1];
      var squaredDistance = ol.math.squaredSegmentDistance(
          x, y, x1, y1, x2, y2);
      if (squaredDistance > maxSquaredDistance) {
        index = i;
        maxSquaredDistance = squaredDistance;
      }
    }
    if (maxSquaredDistance > squaredTolerance) {
      markers[(index - offset) / stride] = 1;
      if (first + stride < index) {
        stack.push(first, index);
      }
      if (index + stride < last) {
        stack.push(index, last);
      }
    }
  }
  for (i = 0; i < n; ++i) {
    if (markers[i]) {
      simplifiedFlatCoordinates[simplifiedOffset++] =
          flatCoordinates[offset + i * stride];
      simplifiedFlatCoordinates[simplifiedOffset++] =
          flatCoordinates[offset + i * stride + 1];
    }
  }
  return simplifiedOffset;
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array.<number>} ends Ends.
 * @param {number} stride Stride.
 * @param {number} squaredTolerance Squared tolerance.
 * @param {Array.<number>} simplifiedFlatCoordinates Simplified flat
 *     coordinates.
 * @param {number} simplifiedOffset Simplified offset.
 * @param {Array.<number>} simplifiedEnds Simplified ends.
 * @return {number} Simplified offset.
 */
ol.geom.flat.simplify.douglasPeuckers = function(flatCoordinates, offset,
    ends, stride, squaredTolerance, simplifiedFlatCoordinates,
    simplifiedOffset, simplifiedEnds) {
  var i, ii;
  for (i = 0, ii = ends.length; i < ii; ++i) {
    var end = ends[i];
    simplifiedOffset = ol.geom.flat.simplify.douglasPeucker(
        flatCoordinates, offset, end, stride, squaredTolerance,
        simplifiedFlatCoordinates, simplifiedOffset);
    simplifiedEnds.push(simplifiedOffset);
    offset = end;
  }
  return simplifiedOffset;
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array.<Array.<number>>} endss Endss.
 * @param {number} stride Stride.
 * @param {number} squaredTolerance Squared tolerance.
 * @param {Array.<number>} simplifiedFlatCoordinates Simplified flat
 *     coordinates.
 * @param {number} simplifiedOffset Simplified offset.
 * @param {Array.<Array.<number>>} simplifiedEndss Simplified endss.
 * @return {number} Simplified offset.
 */
ol.geom.flat.simplify.douglasPeuckerss = function(
    flatCoordinates, offset, endss, stride, squaredTolerance,
    simplifiedFlatCoordinates, simplifiedOffset, simplifiedEndss) {
  var i, ii;
  for (i = 0, ii = endss.length; i < ii; ++i) {
    var ends = endss[i];
    var simplifiedEnds = [];
    simplifiedOffset = ol.geom.flat.simplify.douglasPeuckers(
        flatCoordinates, offset, ends, stride, squaredTolerance,
        simplifiedFlatCoordinates, simplifiedOffset, simplifiedEnds);
    simplifiedEndss.push(simplifiedEnds);
    offset = ends[ends.length - 1];
  }
  return simplifiedOffset;
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @param {number} squaredTolerance Squared tolerance.
 * @param {Array.<number>} simplifiedFlatCoordinates Simplified flat
 *     coordinates.
 * @param {number} simplifiedOffset Simplified offset.
 * @return {number} Simplified offset.
 */
ol.geom.flat.simplify.radialDistance = function(flatCoordinates, offset, end,
    stride, squaredTolerance, simplifiedFlatCoordinates, simplifiedOffset) {
  if (end <= offset + stride) {
    // zero or one point, no simplification possible, so copy and return
    for (; offset < end; offset += stride) {
      simplifiedFlatCoordinates[simplifiedOffset++] = flatCoordinates[offset];
      simplifiedFlatCoordinates[simplifiedOffset++] =
          flatCoordinates[offset + 1];
    }
    return simplifiedOffset;
  }
  var x1 = flatCoordinates[offset];
  var y1 = flatCoordinates[offset + 1];
  // copy first point
  simplifiedFlatCoordinates[simplifiedOffset++] = x1;
  simplifiedFlatCoordinates[simplifiedOffset++] = y1;
  var x2 = x1;
  var y2 = y1;
  for (offset += stride; offset < end; offset += stride) {
    x2 = flatCoordinates[offset];
    y2 = flatCoordinates[offset + 1];
    if (ol.math.squaredDistance(x1, y1, x2, y2) > squaredTolerance) {
      // copy point at offset
      simplifiedFlatCoordinates[simplifiedOffset++] = x2;
      simplifiedFlatCoordinates[simplifiedOffset++] = y2;
      x1 = x2;
      y1 = y2;
    }
  }
  if (x2 != x1 || y2 != y1) {
    // copy last point
    simplifiedFlatCoordinates[simplifiedOffset++] = x2;
    simplifiedFlatCoordinates[simplifiedOffset++] = y2;
  }
  return simplifiedOffset;
};


/**
 * @param {number} value Value.
 * @param {number} tolerance Tolerance.
 * @return {number} Rounded value.
 */
ol.geom.flat.simplify.snap = function(value, tolerance) {
  return tolerance * Math.round(value / tolerance);
};


/**
 * Simplifies a line string using an algorithm designed by Tim Schaub.
 * Coordinates are snapped to the nearest value in a virtual grid and
 * consecutive duplicate coordinates are discarded.  This effectively preserves
 * topology as the simplification of any subsection of a line string is
 * independent of the rest of the line string.  This means that, for examples,
 * the common edge between two polygons will be simplified to the same line
 * string independently in both polygons.  This implementation uses a single
 * pass over the coordinates and eliminates intermediate collinear points.
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @param {number} tolerance Tolerance.
 * @param {Array.<number>} simplifiedFlatCoordinates Simplified flat
 *     coordinates.
 * @param {number} simplifiedOffset Simplified offset.
 * @return {number} Simplified offset.
 */
ol.geom.flat.simplify.quantize = function(flatCoordinates, offset, end, stride,
    tolerance, simplifiedFlatCoordinates, simplifiedOffset) {
  // do nothing if the line is empty
  if (offset == end) {
    return simplifiedOffset;
  }
  // snap the first coordinate (P1)
  var x1 = ol.geom.flat.simplify.snap(flatCoordinates[offset], tolerance);
  var y1 = ol.geom.flat.simplify.snap(flatCoordinates[offset + 1], tolerance);
  offset += stride;
  // add the first coordinate to the output
  simplifiedFlatCoordinates[simplifiedOffset++] = x1;
  simplifiedFlatCoordinates[simplifiedOffset++] = y1;
  // find the next coordinate that does not snap to the same value as the first
  // coordinate (P2)
  var x2, y2;
  do {
    x2 = ol.geom.flat.simplify.snap(flatCoordinates[offset], tolerance);
    y2 = ol.geom.flat.simplify.snap(flatCoordinates[offset + 1], tolerance);
    offset += stride;
    if (offset == end) {
      // all coordinates snap to the same value, the line collapses to a point
      // push the last snapped value anyway to ensure that the output contains
      // at least two points
      // FIXME should we really return at least two points anyway?
      simplifiedFlatCoordinates[simplifiedOffset++] = x2;
      simplifiedFlatCoordinates[simplifiedOffset++] = y2;
      return simplifiedOffset;
    }
  } while (x2 == x1 && y2 == y1);
  while (offset < end) {
    var x3, y3;
    // snap the next coordinate (P3)
    x3 = ol.geom.flat.simplify.snap(flatCoordinates[offset], tolerance);
    y3 = ol.geom.flat.simplify.snap(flatCoordinates[offset + 1], tolerance);
    offset += stride;
    // skip P3 if it is equal to P2
    if (x3 == x2 && y3 == y2) {
      continue;
    }
    // calculate the delta between P1 and P2
    var dx1 = x2 - x1;
    var dy1 = y2 - y1;
    // calculate the delta between P3 and P1
    var dx2 = x3 - x1;
    var dy2 = y3 - y1;
    // if P1, P2, and P3 are colinear and P3 is further from P1 than P2 is from
    // P1 in the same direction then P2 is on the straight line between P1 and
    // P3
    if ((dx1 * dy2 == dy1 * dx2) &&
        ((dx1 < 0 && dx2 < dx1) || dx1 == dx2 || (dx1 > 0 && dx2 > dx1)) &&
        ((dy1 < 0 && dy2 < dy1) || dy1 == dy2 || (dy1 > 0 && dy2 > dy1))) {
      // discard P2 and set P2 = P3
      x2 = x3;
      y2 = y3;
      continue;
    }
    // either P1, P2, and P3 are not colinear, or they are colinear but P3 is
    // between P3 and P1 or on the opposite half of the line to P2.  add P2,
    // and continue with P1 = P2 and P2 = P3
    simplifiedFlatCoordinates[simplifiedOffset++] = x2;
    simplifiedFlatCoordinates[simplifiedOffset++] = y2;
    x1 = x2;
    y1 = y2;
    x2 = x3;
    y2 = y3;
  }
  // add the last point (P2)
  simplifiedFlatCoordinates[simplifiedOffset++] = x2;
  simplifiedFlatCoordinates[simplifiedOffset++] = y2;
  return simplifiedOffset;
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array.<number>} ends Ends.
 * @param {number} stride Stride.
 * @param {number} tolerance Tolerance.
 * @param {Array.<number>} simplifiedFlatCoordinates Simplified flat
 *     coordinates.
 * @param {number} simplifiedOffset Simplified offset.
 * @param {Array.<number>} simplifiedEnds Simplified ends.
 * @return {number} Simplified offset.
 */
ol.geom.flat.simplify.quantizes = function(
    flatCoordinates, offset, ends, stride,
    tolerance,
    simplifiedFlatCoordinates, simplifiedOffset, simplifiedEnds) {
  var i, ii;
  for (i = 0, ii = ends.length; i < ii; ++i) {
    var end = ends[i];
    simplifiedOffset = ol.geom.flat.simplify.quantize(
        flatCoordinates, offset, end, stride,
        tolerance,
        simplifiedFlatCoordinates, simplifiedOffset);
    simplifiedEnds.push(simplifiedOffset);
    offset = end;
  }
  return simplifiedOffset;
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array.<Array.<number>>} endss Endss.
 * @param {number} stride Stride.
 * @param {number} tolerance Tolerance.
 * @param {Array.<number>} simplifiedFlatCoordinates Simplified flat
 *     coordinates.
 * @param {number} simplifiedOffset Simplified offset.
 * @param {Array.<Array.<number>>} simplifiedEndss Simplified endss.
 * @return {number} Simplified offset.
 */
ol.geom.flat.simplify.quantizess = function(
    flatCoordinates, offset, endss, stride,
    tolerance,
    simplifiedFlatCoordinates, simplifiedOffset, simplifiedEndss) {
  var i, ii;
  for (i = 0, ii = endss.length; i < ii; ++i) {
    var ends = endss[i];
    var simplifiedEnds = [];
    simplifiedOffset = ol.geom.flat.simplify.quantizes(
        flatCoordinates, offset, ends, stride,
        tolerance,
        simplifiedFlatCoordinates, simplifiedOffset, simplifiedEnds);
    simplifiedEndss.push(simplifiedEnds);
    offset = ends[ends.length - 1];
  }
  return simplifiedOffset;
};

goog.provide('ol.geom.LinearRing');

goog.require('ol');
goog.require('ol.extent');
goog.require('ol.geom.GeometryLayout');
goog.require('ol.geom.GeometryType');
goog.require('ol.geom.SimpleGeometry');
goog.require('ol.geom.flat.area');
goog.require('ol.geom.flat.closest');
goog.require('ol.geom.flat.deflate');
goog.require('ol.geom.flat.inflate');
goog.require('ol.geom.flat.simplify');


/**
 * @classdesc
 * Linear ring geometry. Only used as part of polygon; cannot be rendered
 * on its own.
 *
 * @constructor
 * @extends {ol.geom.SimpleGeometry}
 * @param {Array.<ol.Coordinate>} coordinates Coordinates.
 * @param {ol.geom.GeometryLayout=} opt_layout Layout.
 * @api stable
 */
ol.geom.LinearRing = function(coordinates, opt_layout) {

  ol.geom.SimpleGeometry.call(this);

  /**
   * @private
   * @type {number}
   */
  this.maxDelta_ = -1;

  /**
   * @private
   * @type {number}
   */
  this.maxDeltaRevision_ = -1;

  this.setCoordinates(coordinates, opt_layout);

};
ol.inherits(ol.geom.LinearRing, ol.geom.SimpleGeometry);


/**
 * Make a complete copy of the geometry.
 * @return {!ol.geom.LinearRing} Clone.
 * @api stable
 */
ol.geom.LinearRing.prototype.clone = function() {
  var linearRing = new ol.geom.LinearRing(null);
  linearRing.setFlatCoordinates(this.layout, this.flatCoordinates.slice());
  return linearRing;
};


/**
 * @inheritDoc
 */
ol.geom.LinearRing.prototype.closestPointXY = function(x, y, closestPoint, minSquaredDistance) {
  if (minSquaredDistance <
      ol.extent.closestSquaredDistanceXY(this.getExtent(), x, y)) {
    return minSquaredDistance;
  }
  if (this.maxDeltaRevision_ != this.getRevision()) {
    this.maxDelta_ = Math.sqrt(ol.geom.flat.closest.getMaxSquaredDelta(
        this.flatCoordinates, 0, this.flatCoordinates.length, this.stride, 0));
    this.maxDeltaRevision_ = this.getRevision();
  }
  return ol.geom.flat.closest.getClosestPoint(
      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,
      this.maxDelta_, true, x, y, closestPoint, minSquaredDistance);
};


/**
 * Return the area of the linear ring on projected plane.
 * @return {number} Area (on projected plane).
 * @api stable
 */
ol.geom.LinearRing.prototype.getArea = function() {
  return ol.geom.flat.area.linearRing(
      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride);
};


/**
 * Return the coordinates of the linear ring.
 * @return {Array.<ol.Coordinate>} Coordinates.
 * @api stable
 */
ol.geom.LinearRing.prototype.getCoordinates = function() {
  return ol.geom.flat.inflate.coordinates(
      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride);
};


/**
 * @inheritDoc
 */
ol.geom.LinearRing.prototype.getSimplifiedGeometryInternal = function(squaredTolerance) {
  var simplifiedFlatCoordinates = [];
  simplifiedFlatCoordinates.length = ol.geom.flat.simplify.douglasPeucker(
      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,
      squaredTolerance, simplifiedFlatCoordinates, 0);
  var simplifiedLinearRing = new ol.geom.LinearRing(null);
  simplifiedLinearRing.setFlatCoordinates(
      ol.geom.GeometryLayout.XY, simplifiedFlatCoordinates);
  return simplifiedLinearRing;
};


/**
 * @inheritDoc
 * @api stable
 */
ol.geom.LinearRing.prototype.getType = function() {
  return ol.geom.GeometryType.LINEAR_RING;
};


/**
 * Set the coordinates of the linear ring.
 * @param {Array.<ol.Coordinate>} coordinates Coordinates.
 * @param {ol.geom.GeometryLayout=} opt_layout Layout.
 * @api stable
 */
ol.geom.LinearRing.prototype.setCoordinates = function(coordinates, opt_layout) {
  if (!coordinates) {
    this.setFlatCoordinates(ol.geom.GeometryLayout.XY, null);
  } else {
    this.setLayout(opt_layout, coordinates, 1);
    if (!this.flatCoordinates) {
      this.flatCoordinates = [];
    }
    this.flatCoordinates.length = ol.geom.flat.deflate.coordinates(
        this.flatCoordinates, 0, coordinates, this.stride);
    this.changed();
  }
};


/**
 * @param {ol.geom.GeometryLayout} layout Layout.
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 */
ol.geom.LinearRing.prototype.setFlatCoordinates = function(layout, flatCoordinates) {
  this.setFlatCoordinatesInternal(layout, flatCoordinates);
  this.changed();
};

goog.provide('ol.geom.Point');

goog.require('ol');
goog.require('ol.extent');
goog.require('ol.geom.GeometryLayout');
goog.require('ol.geom.GeometryType');
goog.require('ol.geom.SimpleGeometry');
goog.require('ol.geom.flat.deflate');
goog.require('ol.math');


/**
 * @classdesc
 * Point geometry.
 *
 * @constructor
 * @extends {ol.geom.SimpleGeometry}
 * @param {ol.Coordinate} coordinates Coordinates.
 * @param {ol.geom.GeometryLayout=} opt_layout Layout.
 * @api stable
 */
ol.geom.Point = function(coordinates, opt_layout) {
  ol.geom.SimpleGeometry.call(this);
  this.setCoordinates(coordinates, opt_layout);
};
ol.inherits(ol.geom.Point, ol.geom.SimpleGeometry);


/**
 * Make a complete copy of the geometry.
 * @return {!ol.geom.Point} Clone.
 * @api stable
 */
ol.geom.Point.prototype.clone = function() {
  var point = new ol.geom.Point(null);
  point.setFlatCoordinates(this.layout, this.flatCoordinates.slice());
  return point;
};


/**
 * @inheritDoc
 */
ol.geom.Point.prototype.closestPointXY = function(x, y, closestPoint, minSquaredDistance) {
  var flatCoordinates = this.flatCoordinates;
  var squaredDistance = ol.math.squaredDistance(
      x, y, flatCoordinates[0], flatCoordinates[1]);
  if (squaredDistance < minSquaredDistance) {
    var stride = this.stride;
    var i;
    for (i = 0; i < stride; ++i) {
      closestPoint[i] = flatCoordinates[i];
    }
    closestPoint.length = stride;
    return squaredDistance;
  } else {
    return minSquaredDistance;
  }
};


/**
 * Return the coordinate of the point.
 * @return {ol.Coordinate} Coordinates.
 * @api stable
 */
ol.geom.Point.prototype.getCoordinates = function() {
  return !this.flatCoordinates ? [] : this.flatCoordinates.slice();
};


/**
 * @inheritDoc
 */
ol.geom.Point.prototype.computeExtent = function(extent) {
  return ol.extent.createOrUpdateFromCoordinate(this.flatCoordinates, extent);
};


/**
 * @inheritDoc
 * @api stable
 */
ol.geom.Point.prototype.getType = function() {
  return ol.geom.GeometryType.POINT;
};


/**
 * @inheritDoc
 * @api stable
 */
ol.geom.Point.prototype.intersectsExtent = function(extent) {
  return ol.extent.containsXY(extent,
      this.flatCoordinates[0], this.flatCoordinates[1]);
};


/**
 * Set the coordinate of the point.
 * @param {ol.Coordinate} coordinates Coordinates.
 * @param {ol.geom.GeometryLayout=} opt_layout Layout.
 * @api stable
 */
ol.geom.Point.prototype.setCoordinates = function(coordinates, opt_layout) {
  if (!coordinates) {
    this.setFlatCoordinates(ol.geom.GeometryLayout.XY, null);
  } else {
    this.setLayout(opt_layout, coordinates, 0);
    if (!this.flatCoordinates) {
      this.flatCoordinates = [];
    }
    this.flatCoordinates.length = ol.geom.flat.deflate.coordinate(
        this.flatCoordinates, 0, coordinates, this.stride);
    this.changed();
  }
};


/**
 * @param {ol.geom.GeometryLayout} layout Layout.
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 */
ol.geom.Point.prototype.setFlatCoordinates = function(layout, flatCoordinates) {
  this.setFlatCoordinatesInternal(layout, flatCoordinates);
  this.changed();
};

goog.provide('ol.geom.flat.contains');

goog.require('ol.extent');


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @param {ol.Extent} extent Extent.
 * @return {boolean} Contains extent.
 */
ol.geom.flat.contains.linearRingContainsExtent = function(flatCoordinates, offset, end, stride, extent) {
  var outside = ol.extent.forEachCorner(extent,
      /**
       * @param {ol.Coordinate} coordinate Coordinate.
       * @return {boolean} Contains (x, y).
       */
      function(coordinate) {
        return !ol.geom.flat.contains.linearRingContainsXY(flatCoordinates,
            offset, end, stride, coordinate[0], coordinate[1]);
      });
  return !outside;
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @param {number} x X.
 * @param {number} y Y.
 * @return {boolean} Contains (x, y).
 */
ol.geom.flat.contains.linearRingContainsXY = function(flatCoordinates, offset, end, stride, x, y) {
  // http://www.ecse.rpi.edu/Homepages/wrf/Research/Short_Notes/pnpoly.html
  var contains = false;
  var x1 = flatCoordinates[end - stride];
  var y1 = flatCoordinates[end - stride + 1];
  for (; offset < end; offset += stride) {
    var x2 = flatCoordinates[offset];
    var y2 = flatCoordinates[offset + 1];
    var intersect = ((y1 > y) != (y2 > y)) &&
        (x < (x2 - x1) * (y - y1) / (y2 - y1) + x1);
    if (intersect) {
      contains = !contains;
    }
    x1 = x2;
    y1 = y2;
  }
  return contains;
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array.<number>} ends Ends.
 * @param {number} stride Stride.
 * @param {number} x X.
 * @param {number} y Y.
 * @return {boolean} Contains (x, y).
 */
ol.geom.flat.contains.linearRingsContainsXY = function(flatCoordinates, offset, ends, stride, x, y) {
  goog.DEBUG && console.assert(ends.length > 0, 'ends should not be an empty array');
  if (ends.length === 0) {
    return false;
  }
  if (!ol.geom.flat.contains.linearRingContainsXY(
      flatCoordinates, offset, ends[0], stride, x, y)) {
    return false;
  }
  var i, ii;
  for (i = 1, ii = ends.length; i < ii; ++i) {
    if (ol.geom.flat.contains.linearRingContainsXY(
        flatCoordinates, ends[i - 1], ends[i], stride, x, y)) {
      return false;
    }
  }
  return true;
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array.<Array.<number>>} endss Endss.
 * @param {number} stride Stride.
 * @param {number} x X.
 * @param {number} y Y.
 * @return {boolean} Contains (x, y).
 */
ol.geom.flat.contains.linearRingssContainsXY = function(flatCoordinates, offset, endss, stride, x, y) {
  goog.DEBUG && console.assert(endss.length > 0, 'endss should not be an empty array');
  if (endss.length === 0) {
    return false;
  }
  var i, ii;
  for (i = 0, ii = endss.length; i < ii; ++i) {
    var ends = endss[i];
    if (ol.geom.flat.contains.linearRingsContainsXY(
        flatCoordinates, offset, ends, stride, x, y)) {
      return true;
    }
    offset = ends[ends.length - 1];
  }
  return false;
};

goog.provide('ol.geom.flat.interiorpoint');

goog.require('ol.array');
goog.require('ol.geom.flat.contains');


/**
 * Calculates a point that is likely to lie in the interior of the linear rings.
 * Inspired by JTS's com.vividsolutions.jts.geom.Geometry#getInteriorPoint.
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array.<number>} ends Ends.
 * @param {number} stride Stride.
 * @param {Array.<number>} flatCenters Flat centers.
 * @param {number} flatCentersOffset Flat center offset.
 * @param {Array.<number>=} opt_dest Destination.
 * @return {Array.<number>} Destination.
 */
ol.geom.flat.interiorpoint.linearRings = function(flatCoordinates, offset,
    ends, stride, flatCenters, flatCentersOffset, opt_dest) {
  var i, ii, x, x1, x2, y1, y2;
  var y = flatCenters[flatCentersOffset + 1];
  /** @type {Array.<number>} */
  var intersections = [];
  // Calculate intersections with the horizontal line
  var end = ends[0];
  x1 = flatCoordinates[end - stride];
  y1 = flatCoordinates[end - stride + 1];
  for (i = offset; i < end; i += stride) {
    x2 = flatCoordinates[i];
    y2 = flatCoordinates[i + 1];
    if ((y <= y1 && y2 <= y) || (y1 <= y && y <= y2)) {
      x = (y - y1) / (y2 - y1) * (x2 - x1) + x1;
      intersections.push(x);
    }
    x1 = x2;
    y1 = y2;
  }
  // Find the longest segment of the horizontal line that has its center point
  // inside the linear ring.
  var pointX = NaN;
  var maxSegmentLength = -Infinity;
  intersections.sort(ol.array.numberSafeCompareFunction);
  x1 = intersections[0];
  for (i = 1, ii = intersections.length; i < ii; ++i) {
    x2 = intersections[i];
    var segmentLength = Math.abs(x2 - x1);
    if (segmentLength > maxSegmentLength) {
      x = (x1 + x2) / 2;
      if (ol.geom.flat.contains.linearRingsContainsXY(
          flatCoordinates, offset, ends, stride, x, y)) {
        pointX = x;
        maxSegmentLength = segmentLength;
      }
    }
    x1 = x2;
  }
  if (isNaN(pointX)) {
    // There is no horizontal line that has its center point inside the linear
    // ring.  Use the center of the the linear ring's extent.
    pointX = flatCenters[flatCentersOffset];
  }
  if (opt_dest) {
    opt_dest.push(pointX, y);
    return opt_dest;
  } else {
    return [pointX, y];
  }
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array.<Array.<number>>} endss Endss.
 * @param {number} stride Stride.
 * @param {Array.<number>} flatCenters Flat centers.
 * @return {Array.<number>} Interior points.
 */
ol.geom.flat.interiorpoint.linearRingss = function(flatCoordinates, offset, endss, stride, flatCenters) {
  goog.DEBUG && console.assert(2 * endss.length == flatCenters.length,
      'endss.length times 2 should be flatCenters.length');
  var interiorPoints = [];
  var i, ii;
  for (i = 0, ii = endss.length; i < ii; ++i) {
    var ends = endss[i];
    interiorPoints = ol.geom.flat.interiorpoint.linearRings(flatCoordinates,
        offset, ends, stride, flatCenters, 2 * i, interiorPoints);
    offset = ends[ends.length - 1];
  }
  return interiorPoints;
};

goog.provide('ol.geom.flat.segments');


/**
 * This function calls `callback` for each segment of the flat coordinates
 * array. If the callback returns a truthy value the function returns that
 * value immediately. Otherwise the function returns `false`.
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @param {function(this: S, ol.Coordinate, ol.Coordinate): T} callback Function
 *     called for each segment.
 * @param {S=} opt_this The object to be used as the value of 'this'
 *     within callback.
 * @return {T|boolean} Value.
 * @template T,S
 */
ol.geom.flat.segments.forEach = function(flatCoordinates, offset, end, stride, callback, opt_this) {
  var point1 = [flatCoordinates[offset], flatCoordinates[offset + 1]];
  var point2 = [];
  var ret;
  for (; (offset + stride) < end; offset += stride) {
    point2[0] = flatCoordinates[offset + stride];
    point2[1] = flatCoordinates[offset + stride + 1];
    ret = callback.call(opt_this, point1, point2);
    if (ret) {
      return ret;
    }
    point1[0] = point2[0];
    point1[1] = point2[1];
  }
  return false;
};

goog.provide('ol.geom.flat.intersectsextent');

goog.require('ol.extent');
goog.require('ol.geom.flat.contains');
goog.require('ol.geom.flat.segments');


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @param {ol.Extent} extent Extent.
 * @return {boolean} True if the geometry and the extent intersect.
 */
ol.geom.flat.intersectsextent.lineString = function(flatCoordinates, offset, end, stride, extent) {
  var coordinatesExtent = ol.extent.extendFlatCoordinates(
      ol.extent.createEmpty(), flatCoordinates, offset, end, stride);
  if (!ol.extent.intersects(extent, coordinatesExtent)) {
    return false;
  }
  if (ol.extent.containsExtent(extent, coordinatesExtent)) {
    return true;
  }
  if (coordinatesExtent[0] >= extent[0] &&
      coordinatesExtent[2] <= extent[2]) {
    return true;
  }
  if (coordinatesExtent[1] >= extent[1] &&
      coordinatesExtent[3] <= extent[3]) {
    return true;
  }
  return ol.geom.flat.segments.forEach(flatCoordinates, offset, end, stride,
      /**
       * @param {ol.Coordinate} point1 Start point.
       * @param {ol.Coordinate} point2 End point.
       * @return {boolean} `true` if the segment and the extent intersect,
       *     `false` otherwise.
       */
      function(point1, point2) {
        return ol.extent.intersectsSegment(extent, point1, point2);
      });
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array.<number>} ends Ends.
 * @param {number} stride Stride.
 * @param {ol.Extent} extent Extent.
 * @return {boolean} True if the geometry and the extent intersect.
 */
ol.geom.flat.intersectsextent.lineStrings = function(flatCoordinates, offset, ends, stride, extent) {
  var i, ii;
  for (i = 0, ii = ends.length; i < ii; ++i) {
    if (ol.geom.flat.intersectsextent.lineString(
        flatCoordinates, offset, ends[i], stride, extent)) {
      return true;
    }
    offset = ends[i];
  }
  return false;
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @param {ol.Extent} extent Extent.
 * @return {boolean} True if the geometry and the extent intersect.
 */
ol.geom.flat.intersectsextent.linearRing = function(flatCoordinates, offset, end, stride, extent) {
  if (ol.geom.flat.intersectsextent.lineString(
      flatCoordinates, offset, end, stride, extent)) {
    return true;
  }
  if (ol.geom.flat.contains.linearRingContainsXY(
      flatCoordinates, offset, end, stride, extent[0], extent[1])) {
    return true;
  }
  if (ol.geom.flat.contains.linearRingContainsXY(
      flatCoordinates, offset, end, stride, extent[0], extent[3])) {
    return true;
  }
  if (ol.geom.flat.contains.linearRingContainsXY(
      flatCoordinates, offset, end, stride, extent[2], extent[1])) {
    return true;
  }
  if (ol.geom.flat.contains.linearRingContainsXY(
      flatCoordinates, offset, end, stride, extent[2], extent[3])) {
    return true;
  }
  return false;
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array.<number>} ends Ends.
 * @param {number} stride Stride.
 * @param {ol.Extent} extent Extent.
 * @return {boolean} True if the geometry and the extent intersect.
 */
ol.geom.flat.intersectsextent.linearRings = function(flatCoordinates, offset, ends, stride, extent) {
  goog.DEBUG && console.assert(ends.length > 0, 'ends should not be an empty array');
  if (!ol.geom.flat.intersectsextent.linearRing(
      flatCoordinates, offset, ends[0], stride, extent)) {
    return false;
  }
  if (ends.length === 1) {
    return true;
  }
  var i, ii;
  for (i = 1, ii = ends.length; i < ii; ++i) {
    if (ol.geom.flat.contains.linearRingContainsExtent(
        flatCoordinates, ends[i - 1], ends[i], stride, extent)) {
      return false;
    }
  }
  return true;
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array.<Array.<number>>} endss Endss.
 * @param {number} stride Stride.
 * @param {ol.Extent} extent Extent.
 * @return {boolean} True if the geometry and the extent intersect.
 */
ol.geom.flat.intersectsextent.linearRingss = function(flatCoordinates, offset, endss, stride, extent) {
  goog.DEBUG && console.assert(endss.length > 0, 'endss should not be an empty array');
  var i, ii;
  for (i = 0, ii = endss.length; i < ii; ++i) {
    var ends = endss[i];
    if (ol.geom.flat.intersectsextent.linearRings(
        flatCoordinates, offset, ends, stride, extent)) {
      return true;
    }
    offset = ends[ends.length - 1];
  }
  return false;
};

goog.provide('ol.geom.flat.reverse');


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 */
ol.geom.flat.reverse.coordinates = function(flatCoordinates, offset, end, stride) {
  while (offset < end - stride) {
    var i;
    for (i = 0; i < stride; ++i) {
      var tmp = flatCoordinates[offset + i];
      flatCoordinates[offset + i] = flatCoordinates[end - stride + i];
      flatCoordinates[end - stride + i] = tmp;
    }
    offset += stride;
    end -= stride;
  }
};

goog.provide('ol.geom.flat.orient');

goog.require('ol');
goog.require('ol.geom.flat.reverse');


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @return {boolean} Is clockwise.
 */
ol.geom.flat.orient.linearRingIsClockwise = function(flatCoordinates, offset, end, stride) {
  // http://tinyurl.com/clockwise-method
  // https://github.com/OSGeo/gdal/blob/trunk/gdal/ogr/ogrlinearring.cpp
  var edge = 0;
  var x1 = flatCoordinates[end - stride];
  var y1 = flatCoordinates[end - stride + 1];
  for (; offset < end; offset += stride) {
    var x2 = flatCoordinates[offset];
    var y2 = flatCoordinates[offset + 1];
    edge += (x2 - x1) * (y2 + y1);
    x1 = x2;
    y1 = y2;
  }
  return edge > 0;
};


/**
 * Determines if linear rings are oriented.  By default, left-hand orientation
 * is tested (first ring must be clockwise, remaining rings counter-clockwise).
 * To test for right-hand orientation, use the `opt_right` argument.
 *
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array.<number>} ends Array of end indexes.
 * @param {number} stride Stride.
 * @param {boolean=} opt_right Test for right-hand orientation
 *     (counter-clockwise exterior ring and clockwise interior rings).
 * @return {boolean} Rings are correctly oriented.
 */
ol.geom.flat.orient.linearRingsAreOriented = function(flatCoordinates, offset, ends, stride, opt_right) {
  var right = opt_right !== undefined ? opt_right : false;
  var i, ii;
  for (i = 0, ii = ends.length; i < ii; ++i) {
    var end = ends[i];
    var isClockwise = ol.geom.flat.orient.linearRingIsClockwise(
        flatCoordinates, offset, end, stride);
    if (i === 0) {
      if ((right && isClockwise) || (!right && !isClockwise)) {
        return false;
      }
    } else {
      if ((right && !isClockwise) || (!right && isClockwise)) {
        return false;
      }
    }
    offset = end;
  }
  return true;
};


/**
 * Determines if linear rings are oriented.  By default, left-hand orientation
 * is tested (first ring must be clockwise, remaining rings counter-clockwise).
 * To test for right-hand orientation, use the `opt_right` argument.
 *
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array.<Array.<number>>} endss Array of array of end indexes.
 * @param {number} stride Stride.
 * @param {boolean=} opt_right Test for right-hand orientation
 *     (counter-clockwise exterior ring and clockwise interior rings).
 * @return {boolean} Rings are correctly oriented.
 */
ol.geom.flat.orient.linearRingssAreOriented = function(flatCoordinates, offset, endss, stride, opt_right) {
  var i, ii;
  for (i = 0, ii = endss.length; i < ii; ++i) {
    if (!ol.geom.flat.orient.linearRingsAreOriented(
        flatCoordinates, offset, endss[i], stride, opt_right)) {
      return false;
    }
  }
  return true;
};


/**
 * Orient coordinates in a flat array of linear rings.  By default, rings
 * are oriented following the left-hand rule (clockwise for exterior and
 * counter-clockwise for interior rings).  To orient according to the
 * right-hand rule, use the `opt_right` argument.
 *
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array.<number>} ends Ends.
 * @param {number} stride Stride.
 * @param {boolean=} opt_right Follow the right-hand rule for orientation.
 * @return {number} End.
 */
ol.geom.flat.orient.orientLinearRings = function(flatCoordinates, offset, ends, stride, opt_right) {
  var right = opt_right !== undefined ? opt_right : false;
  var i, ii;
  for (i = 0, ii = ends.length; i < ii; ++i) {
    var end = ends[i];
    var isClockwise = ol.geom.flat.orient.linearRingIsClockwise(
        flatCoordinates, offset, end, stride);
    var reverse = i === 0 ?
        (right && isClockwise) || (!right && !isClockwise) :
        (right && !isClockwise) || (!right && isClockwise);
    if (reverse) {
      ol.geom.flat.reverse.coordinates(flatCoordinates, offset, end, stride);
    }
    offset = end;
  }
  return offset;
};


/**
 * Orient coordinates in a flat array of linear rings.  By default, rings
 * are oriented following the left-hand rule (clockwise for exterior and
 * counter-clockwise for interior rings).  To orient according to the
 * right-hand rule, use the `opt_right` argument.
 *
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array.<Array.<number>>} endss Array of array of end indexes.
 * @param {number} stride Stride.
 * @param {boolean=} opt_right Follow the right-hand rule for orientation.
 * @return {number} End.
 */
ol.geom.flat.orient.orientLinearRingss = function(flatCoordinates, offset, endss, stride, opt_right) {
  var i, ii;
  for (i = 0, ii = endss.length; i < ii; ++i) {
    offset = ol.geom.flat.orient.orientLinearRings(
        flatCoordinates, offset, endss[i], stride, opt_right);
  }
  return offset;
};

goog.provide('ol.geom.Polygon');

goog.require('ol');
goog.require('ol.array');
goog.require('ol.extent');
goog.require('ol.geom.GeometryLayout');
goog.require('ol.geom.GeometryType');
goog.require('ol.geom.LinearRing');
goog.require('ol.geom.Point');
goog.require('ol.geom.SimpleGeometry');
goog.require('ol.geom.flat.area');
goog.require('ol.geom.flat.closest');
goog.require('ol.geom.flat.contains');
goog.require('ol.geom.flat.deflate');
goog.require('ol.geom.flat.inflate');
goog.require('ol.geom.flat.interiorpoint');
goog.require('ol.geom.flat.intersectsextent');
goog.require('ol.geom.flat.orient');
goog.require('ol.geom.flat.simplify');
goog.require('ol.math');


/**
 * @classdesc
 * Polygon geometry.
 *
 * @constructor
 * @extends {ol.geom.SimpleGeometry}
 * @param {Array.<Array.<ol.Coordinate>>} coordinates Coordinates.
 * @param {ol.geom.GeometryLayout=} opt_layout Layout.
 * @api stable
 */
ol.geom.Polygon = function(coordinates, opt_layout) {

  ol.geom.SimpleGeometry.call(this);

  /**
   * @type {Array.<number>}
   * @private
   */
  this.ends_ = [];

  /**
   * @private
   * @type {number}
   */
  this.flatInteriorPointRevision_ = -1;

  /**
   * @private
   * @type {ol.Coordinate}
   */
  this.flatInteriorPoint_ = null;

  /**
   * @private
   * @type {number}
   */
  this.maxDelta_ = -1;

  /**
   * @private
   * @type {number}
   */
  this.maxDeltaRevision_ = -1;

  /**
   * @private
   * @type {number}
   */
  this.orientedRevision_ = -1;

  /**
   * @private
   * @type {Array.<number>}
   */
  this.orientedFlatCoordinates_ = null;

  this.setCoordinates(coordinates, opt_layout);

};
ol.inherits(ol.geom.Polygon, ol.geom.SimpleGeometry);


/**
 * Append the passed linear ring to this polygon.
 * @param {ol.geom.LinearRing} linearRing Linear ring.
 * @api stable
 */
ol.geom.Polygon.prototype.appendLinearRing = function(linearRing) {
  goog.DEBUG && console.assert(linearRing.getLayout() == this.layout,
      'layout of linearRing should match layout');
  if (!this.flatCoordinates) {
    this.flatCoordinates = linearRing.getFlatCoordinates().slice();
  } else {
    ol.array.extend(this.flatCoordinates, linearRing.getFlatCoordinates());
  }
  this.ends_.push(this.flatCoordinates.length);
  this.changed();
};


/**
 * Make a complete copy of the geometry.
 * @return {!ol.geom.Polygon} Clone.
 * @api stable
 */
ol.geom.Polygon.prototype.clone = function() {
  var polygon = new ol.geom.Polygon(null);
  polygon.setFlatCoordinates(
      this.layout, this.flatCoordinates.slice(), this.ends_.slice());
  return polygon;
};


/**
 * @inheritDoc
 */
ol.geom.Polygon.prototype.closestPointXY = function(x, y, closestPoint, minSquaredDistance) {
  if (minSquaredDistance <
      ol.extent.closestSquaredDistanceXY(this.getExtent(), x, y)) {
    return minSquaredDistance;
  }
  if (this.maxDeltaRevision_ != this.getRevision()) {
    this.maxDelta_ = Math.sqrt(ol.geom.flat.closest.getsMaxSquaredDelta(
        this.flatCoordinates, 0, this.ends_, this.stride, 0));
    this.maxDeltaRevision_ = this.getRevision();
  }
  return ol.geom.flat.closest.getsClosestPoint(
      this.flatCoordinates, 0, this.ends_, this.stride,
      this.maxDelta_, true, x, y, closestPoint, minSquaredDistance);
};


/**
 * @inheritDoc
 */
ol.geom.Polygon.prototype.containsXY = function(x, y) {
  return ol.geom.flat.contains.linearRingsContainsXY(
      this.getOrientedFlatCoordinates(), 0, this.ends_, this.stride, x, y);
};


/**
 * Return the area of the polygon on projected plane.
 * @return {number} Area (on projected plane).
 * @api stable
 */
ol.geom.Polygon.prototype.getArea = function() {
  return ol.geom.flat.area.linearRings(
      this.getOrientedFlatCoordinates(), 0, this.ends_, this.stride);
};


/**
 * Get the coordinate array for this geometry.  This array has the structure
 * of a GeoJSON coordinate array for polygons.
 *
 * @param {boolean=} opt_right Orient coordinates according to the right-hand
 *     rule (counter-clockwise for exterior and clockwise for interior rings).
 *     If `false`, coordinates will be oriented according to the left-hand rule
 *     (clockwise for exterior and counter-clockwise for interior rings).
 *     By default, coordinate orientation will depend on how the geometry was
 *     constructed.
 * @return {Array.<Array.<ol.Coordinate>>} Coordinates.
 * @api stable
 */
ol.geom.Polygon.prototype.getCoordinates = function(opt_right) {
  var flatCoordinates;
  if (opt_right !== undefined) {
    flatCoordinates = this.getOrientedFlatCoordinates().slice();
    ol.geom.flat.orient.orientLinearRings(
        flatCoordinates, 0, this.ends_, this.stride, opt_right);
  } else {
    flatCoordinates = this.flatCoordinates;
  }

  return ol.geom.flat.inflate.coordinatess(
      flatCoordinates, 0, this.ends_, this.stride);
};


/**
 * @return {Array.<number>} Ends.
 */
ol.geom.Polygon.prototype.getEnds = function() {
  return this.ends_;
};


/**
 * @return {Array.<number>} Interior point.
 */
ol.geom.Polygon.prototype.getFlatInteriorPoint = function() {
  if (this.flatInteriorPointRevision_ != this.getRevision()) {
    var flatCenter = ol.extent.getCenter(this.getExtent());
    this.flatInteriorPoint_ = ol.geom.flat.interiorpoint.linearRings(
        this.getOrientedFlatCoordinates(), 0, this.ends_, this.stride,
        flatCenter, 0);
    this.flatInteriorPointRevision_ = this.getRevision();
  }
  return this.flatInteriorPoint_;
};


/**
 * Return an interior point of the polygon.
 * @return {ol.geom.Point} Interior point.
 * @api stable
 */
ol.geom.Polygon.prototype.getInteriorPoint = function() {
  return new ol.geom.Point(this.getFlatInteriorPoint());
};


/**
 * Return the number of rings of the polygon,  this includes the exterior
 * ring and any interior rings.
 *
 * @return {number} Number of rings.
 * @api
 */
ol.geom.Polygon.prototype.getLinearRingCount = function() {
  return this.ends_.length;
};


/**
 * Return the Nth linear ring of the polygon geometry. Return `null` if the
 * given index is out of range.
 * The exterior linear ring is available at index `0` and the interior rings
 * at index `1` and beyond.
 *
 * @param {number} index Index.
 * @return {ol.geom.LinearRing} Linear ring.
 * @api stable
 */
ol.geom.Polygon.prototype.getLinearRing = function(index) {
  goog.DEBUG && console.assert(0 <= index && index < this.ends_.length,
      'index should be in between 0 and and length of this.ends_');
  if (index < 0 || this.ends_.length <= index) {
    return null;
  }
  var linearRing = new ol.geom.LinearRing(null);
  linearRing.setFlatCoordinates(this.layout, this.flatCoordinates.slice(
      index === 0 ? 0 : this.ends_[index - 1], this.ends_[index]));
  return linearRing;
};


/**
 * Return the linear rings of the polygon.
 * @return {Array.<ol.geom.LinearRing>} Linear rings.
 * @api stable
 */
ol.geom.Polygon.prototype.getLinearRings = function() {
  var layout = this.layout;
  var flatCoordinates = this.flatCoordinates;
  var ends = this.ends_;
  var linearRings = [];
  var offset = 0;
  var i, ii;
  for (i = 0, ii = ends.length; i < ii; ++i) {
    var end = ends[i];
    var linearRing = new ol.geom.LinearRing(null);
    linearRing.setFlatCoordinates(layout, flatCoordinates.slice(offset, end));
    linearRings.push(linearRing);
    offset = end;
  }
  return linearRings;
};


/**
 * @return {Array.<number>} Oriented flat coordinates.
 */
ol.geom.Polygon.prototype.getOrientedFlatCoordinates = function() {
  if (this.orientedRevision_ != this.getRevision()) {
    var flatCoordinates = this.flatCoordinates;
    if (ol.geom.flat.orient.linearRingsAreOriented(
        flatCoordinates, 0, this.ends_, this.stride)) {
      this.orientedFlatCoordinates_ = flatCoordinates;
    } else {
      this.orientedFlatCoordinates_ = flatCoordinates.slice();
      this.orientedFlatCoordinates_.length =
          ol.geom.flat.orient.orientLinearRings(
              this.orientedFlatCoordinates_, 0, this.ends_, this.stride);
    }
    this.orientedRevision_ = this.getRevision();
  }
  return this.orientedFlatCoordinates_;
};


/**
 * @inheritDoc
 */
ol.geom.Polygon.prototype.getSimplifiedGeometryInternal = function(squaredTolerance) {
  var simplifiedFlatCoordinates = [];
  var simplifiedEnds = [];
  simplifiedFlatCoordinates.length = ol.geom.flat.simplify.quantizes(
      this.flatCoordinates, 0, this.ends_, this.stride,
      Math.sqrt(squaredTolerance),
      simplifiedFlatCoordinates, 0, simplifiedEnds);
  var simplifiedPolygon = new ol.geom.Polygon(null);
  simplifiedPolygon.setFlatCoordinates(
      ol.geom.GeometryLayout.XY, simplifiedFlatCoordinates, simplifiedEnds);
  return simplifiedPolygon;
};


/**
 * @inheritDoc
 * @api stable
 */
ol.geom.Polygon.prototype.getType = function() {
  return ol.geom.GeometryType.POLYGON;
};


/**
 * @inheritDoc
 * @api stable
 */
ol.geom.Polygon.prototype.intersectsExtent = function(extent) {
  return ol.geom.flat.intersectsextent.linearRings(
      this.getOrientedFlatCoordinates(), 0, this.ends_, this.stride, extent);
};


/**
 * Set the coordinates of the polygon.
 * @param {Array.<Array.<ol.Coordinate>>} coordinates Coordinates.
 * @param {ol.geom.GeometryLayout=} opt_layout Layout.
 * @api stable
 */
ol.geom.Polygon.prototype.setCoordinates = function(coordinates, opt_layout) {
  if (!coordinates) {
    this.setFlatCoordinates(ol.geom.GeometryLayout.XY, null, this.ends_);
  } else {
    this.setLayout(opt_layout, coordinates, 2);
    if (!this.flatCoordinates) {
      this.flatCoordinates = [];
    }
    var ends = ol.geom.flat.deflate.coordinatess(
        this.flatCoordinates, 0, coordinates, this.stride, this.ends_);
    this.flatCoordinates.length = ends.length === 0 ? 0 : ends[ends.length - 1];
    this.changed();
  }
};


/**
 * @param {ol.geom.GeometryLayout} layout Layout.
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {Array.<number>} ends Ends.
 */
ol.geom.Polygon.prototype.setFlatCoordinates = function(layout, flatCoordinates, ends) {
  if (!flatCoordinates) {
    goog.DEBUG && console.assert(ends && ends.length === 0,
        'ends must be an empty array');
  } else if (ends.length === 0) {
    goog.DEBUG && console.assert(flatCoordinates.length === 0,
        'flatCoordinates should be an empty array');
  } else {
    goog.DEBUG && console.assert(flatCoordinates.length == ends[ends.length - 1],
        'the length of flatCoordinates should be the last entry of ends');
  }
  this.setFlatCoordinatesInternal(layout, flatCoordinates);
  this.ends_ = ends;
  this.changed();
};


/**
 * Create an approximation of a circle on the surface of a sphere.
 * @param {ol.Sphere} sphere The sphere.
 * @param {ol.Coordinate} center Center (`[lon, lat]` in degrees).
 * @param {number} radius The great-circle distance from the center to
 *     the polygon vertices.
 * @param {number=} opt_n Optional number of vertices for the resulting
 *     polygon. Default is `32`.
 * @return {ol.geom.Polygon} The "circular" polygon.
 * @api stable
 */
ol.geom.Polygon.circular = function(sphere, center, radius, opt_n) {
  var n = opt_n ? opt_n : 32;
  /** @type {Array.<number>} */
  var flatCoordinates = [];
  var i;
  for (i = 0; i < n; ++i) {
    ol.array.extend(
        flatCoordinates, sphere.offset(center, radius, 2 * Math.PI * i / n));
  }
  flatCoordinates.push(flatCoordinates[0], flatCoordinates[1]);
  var polygon = new ol.geom.Polygon(null);
  polygon.setFlatCoordinates(
      ol.geom.GeometryLayout.XY, flatCoordinates, [flatCoordinates.length]);
  return polygon;
};


/**
 * Create a polygon from an extent. The layout used is `XY`.
 * @param {ol.Extent} extent The extent.
 * @return {ol.geom.Polygon} The polygon.
 * @api
 */
ol.geom.Polygon.fromExtent = function(extent) {
  var minX = extent[0];
  var minY = extent[1];
  var maxX = extent[2];
  var maxY = extent[3];
  var flatCoordinates =
      [minX, minY, minX, maxY, maxX, maxY, maxX, minY, minX, minY];
  var polygon = new ol.geom.Polygon(null);
  polygon.setFlatCoordinates(
      ol.geom.GeometryLayout.XY, flatCoordinates, [flatCoordinates.length]);
  return polygon;
};


/**
 * Create a regular polygon from a circle.
 * @param {ol.geom.Circle} circle Circle geometry.
 * @param {number=} opt_sides Number of sides of the polygon. Default is 32.
 * @param {number=} opt_angle Start angle for the first vertex of the polygon in
 *     radians. Default is 0.
 * @return {ol.geom.Polygon} Polygon geometry.
 * @api
 */
ol.geom.Polygon.fromCircle = function(circle, opt_sides, opt_angle) {
  var sides = opt_sides ? opt_sides : 32;
  var stride = circle.getStride();
  var layout = circle.getLayout();
  var polygon = new ol.geom.Polygon(null, layout);
  var arrayLength = stride * (sides + 1);
  var flatCoordinates = new Array(arrayLength);
  for (var i = 0; i < arrayLength; i++) {
    flatCoordinates[i] = 0;
  }
  var ends = [flatCoordinates.length];
  polygon.setFlatCoordinates(layout, flatCoordinates, ends);
  ol.geom.Polygon.makeRegular(
      polygon, circle.getCenter(), circle.getRadius(), opt_angle);
  return polygon;
};


/**
 * Modify the coordinates of a polygon to make it a regular polygon.
 * @param {ol.geom.Polygon} polygon Polygon geometry.
 * @param {ol.Coordinate} center Center of the regular polygon.
 * @param {number} radius Radius of the regular polygon.
 * @param {number=} opt_angle Start angle for the first vertex of the polygon in
 *     radians. Default is 0.
 */
ol.geom.Polygon.makeRegular = function(polygon, center, radius, opt_angle) {
  var flatCoordinates = polygon.getFlatCoordinates();
  var layout = polygon.getLayout();
  var stride = polygon.getStride();
  var ends = polygon.getEnds();
  goog.DEBUG && console.assert(ends.length === 1, 'only 1 ring is supported');
  var sides = flatCoordinates.length / stride - 1;
  var startAngle = opt_angle ? opt_angle : 0;
  var angle, offset;
  for (var i = 0; i <= sides; ++i) {
    offset = i * stride;
    angle = startAngle + (ol.math.modulo(i, sides) * 2 * Math.PI / sides);
    flatCoordinates[offset] = center[0] + (radius * Math.cos(angle));
    flatCoordinates[offset + 1] = center[1] + (radius * Math.sin(angle));
  }
  polygon.setFlatCoordinates(layout, flatCoordinates, ends);
};

goog.provide('ol.View');

goog.require('ol');
goog.require('ol.CenterConstraint');
goog.require('ol.Constraints');
goog.require('ol.Object');
goog.require('ol.ResolutionConstraint');
goog.require('ol.RotationConstraint');
goog.require('ol.array');
goog.require('ol.asserts');
goog.require('ol.coordinate');
goog.require('ol.extent');
goog.require('ol.geom.Polygon');
goog.require('ol.geom.SimpleGeometry');
goog.require('ol.proj');
goog.require('ol.proj.METERS_PER_UNIT');
goog.require('ol.proj.Units');


/**
 * @classdesc
 * An ol.View object represents a simple 2D view of the map.
 *
 * This is the object to act upon to change the center, resolution,
 * and rotation of the map.
 *
 * ### The view states
 *
 * An `ol.View` is determined by three states: `center`, `resolution`,
 * and `rotation`. Each state has a corresponding getter and setter, e.g.
 * `getCenter` and `setCenter` for the `center` state.
 *
 * An `ol.View` has a `projection`. The projection determines the
 * coordinate system of the center, and its units determine the units of the
 * resolution (projection units per pixel). The default projection is
 * Spherical Mercator (EPSG:3857).
 *
 * ### The constraints
 *
 * `setCenter`, `setResolution` and `setRotation` can be used to change the
 * states of the view. Any value can be passed to the setters. And the value
 * that is passed to a setter will effectively be the value set in the view,
 * and returned by the corresponding getter.
 *
 * But an `ol.View` object also has a *resolution constraint*, a
 * *rotation constraint* and a *center constraint*.
 *
 * As said above, no constraints are applied when the setters are used to set
 * new states for the view. Applying constraints is done explicitly through
 * the use of the `constrain*` functions (`constrainResolution` and
 * `constrainRotation` and `constrainCenter`).
 *
 * The main users of the constraints are the interactions and the
 * controls. For example, double-clicking on the map changes the view to
 * the "next" resolution. And releasing the fingers after pinch-zooming
 * snaps to the closest resolution (with an animation).
 *
 * The *resolution constraint* snaps to specific resolutions. It is
 * determined by the following options: `resolutions`, `maxResolution`,
 * `maxZoom`, and `zoomFactor`. If `resolutions` is set, the other three
 * options are ignored. See documentation for each option for more
 * information.
 *
 * The *rotation constraint* snaps to specific angles. It is determined
 * by the following options: `enableRotation` and `constrainRotation`.
 * By default the rotation value is snapped to zero when approaching the
 * horizontal.
 *
 * The *center constraint* is determined by the `extent` option. By
 * default the center is not constrained at all.
 *
 * @constructor
 * @extends {ol.Object}
 * @param {olx.ViewOptions=} opt_options View options.
 * @api stable
 */
ol.View = function(opt_options) {
  ol.Object.call(this);
  var options = opt_options || {};

  /**
   * @private
   * @type {Array.<number>}
   */
  this.hints_ = [0, 0];

  /**
   * @type {Object.<string, *>}
   */
  var properties = {};
  properties[ol.View.Property.CENTER] = options.center !== undefined ?
      options.center : null;

  /**
   * @private
   * @const
   * @type {ol.proj.Projection}
   */
  this.projection_ = ol.proj.createProjection(options.projection, 'EPSG:3857');

  var resolutionConstraintInfo = ol.View.createResolutionConstraint_(
      options);

  /**
   * @private
   * @type {number}
   */
  this.maxResolution_ = resolutionConstraintInfo.maxResolution;

  /**
   * @private
   * @type {number}
   */
  this.minResolution_ = resolutionConstraintInfo.minResolution;

  /**
   * @private
   * @type {number}
   */
  this.zoomFactor_ = resolutionConstraintInfo.zoomFactor;

  /**
   * @private
   * @type {Array.<number>|undefined}
   */
  this.resolutions_ = options.resolutions;

  /**
   * @private
   * @type {number}
   */
  this.minZoom_ = resolutionConstraintInfo.minZoom;

  var centerConstraint = ol.View.createCenterConstraint_(options);
  var resolutionConstraint = resolutionConstraintInfo.constraint;
  var rotationConstraint = ol.View.createRotationConstraint_(options);

  /**
   * @private
   * @type {ol.Constraints}
   */
  this.constraints_ = new ol.Constraints(
      centerConstraint, resolutionConstraint, rotationConstraint);

  if (options.resolution !== undefined) {
    properties[ol.View.Property.RESOLUTION] = options.resolution;
  } else if (options.zoom !== undefined) {
    properties[ol.View.Property.RESOLUTION] = this.constrainResolution(
        this.maxResolution_, options.zoom - this.minZoom_);
  }
  properties[ol.View.Property.ROTATION] =
      options.rotation !== undefined ? options.rotation : 0;
  this.setProperties(properties);
};
ol.inherits(ol.View, ol.Object);


/**
 * @param {number} rotation Target rotation.
 * @param {ol.Coordinate} anchor Rotation anchor.
 * @return {ol.Coordinate|undefined} Center for rotation and anchor.
 */
ol.View.prototype.calculateCenterRotate = function(rotation, anchor) {
  var center;
  var currentCenter = this.getCenter();
  if (currentCenter !== undefined) {
    center = [currentCenter[0] - anchor[0], currentCenter[1] - anchor[1]];
    ol.coordinate.rotate(center, rotation - this.getRotation());
    ol.coordinate.add(center, anchor);
  }
  return center;
};


/**
 * @param {number} resolution Target resolution.
 * @param {ol.Coordinate} anchor Zoom anchor.
 * @return {ol.Coordinate|undefined} Center for resolution and anchor.
 */
ol.View.prototype.calculateCenterZoom = function(resolution, anchor) {
  var center;
  var currentCenter = this.getCenter();
  var currentResolution = this.getResolution();
  if (currentCenter !== undefined && currentResolution !== undefined) {
    var x = anchor[0] -
        resolution * (anchor[0] - currentCenter[0]) / currentResolution;
    var y = anchor[1] -
        resolution * (anchor[1] - currentCenter[1]) / currentResolution;
    center = [x, y];
  }
  return center;
};


/**
 * Get the constrained center of this view.
 * @param {ol.Coordinate|undefined} center Center.
 * @return {ol.Coordinate|undefined} Constrained center.
 * @api
 */
ol.View.prototype.constrainCenter = function(center) {
  return this.constraints_.center(center);
};


/**
 * Get the constrained resolution of this view.
 * @param {number|undefined} resolution Resolution.
 * @param {number=} opt_delta Delta. Default is `0`.
 * @param {number=} opt_direction Direction. Default is `0`.
 * @return {number|undefined} Constrained resolution.
 * @api
 */
ol.View.prototype.constrainResolution = function(
    resolution, opt_delta, opt_direction) {
  var delta = opt_delta || 0;
  var direction = opt_direction || 0;
  return this.constraints_.resolution(resolution, delta, direction);
};


/**
 * Get the constrained rotation of this view.
 * @param {number|undefined} rotation Rotation.
 * @param {number=} opt_delta Delta. Default is `0`.
 * @return {number|undefined} Constrained rotation.
 * @api
 */
ol.View.prototype.constrainRotation = function(rotation, opt_delta) {
  var delta = opt_delta || 0;
  return this.constraints_.rotation(rotation, delta);
};


/**
 * Get the view center.
 * @return {ol.Coordinate|undefined} The center of the view.
 * @observable
 * @api stable
 */
ol.View.prototype.getCenter = function() {
  return /** @type {ol.Coordinate|undefined} */ (
      this.get(ol.View.Property.CENTER));
};


/**
 * @param {Array.<number>=} opt_hints Destination array.
 * @return {Array.<number>} Hint.
 */
ol.View.prototype.getHints = function(opt_hints) {
  if (opt_hints !== undefined) {
    opt_hints[0] = this.hints_[0];
    opt_hints[1] = this.hints_[1];
    return opt_hints;
  } else {
    return this.hints_.slice();
  }
};


/**
 * Calculate the extent for the current view state and the passed size.
 * The size is the pixel dimensions of the box into which the calculated extent
 * should fit. In most cases you want to get the extent of the entire map,
 * that is `map.getSize()`.
 * @param {ol.Size} size Box pixel size.
 * @return {ol.Extent} Extent.
 * @api stable
 */
ol.View.prototype.calculateExtent = function(size) {
  var center = /** @type {!ol.Coordinate} */ (this.getCenter());
  ol.asserts.assert(center, 1); // The view center is not defined
  var resolution = /** @type {!number} */ (this.getResolution());
  ol.asserts.assert(resolution !== undefined, 2); // The view resolution is not defined
  var rotation = /** @type {!number} */ (this.getRotation());
  ol.asserts.assert(rotation !== undefined, 3); // The view rotation is not defined

  return ol.extent.getForViewAndSize(center, resolution, rotation, size);
};


/**
 * Get the maximum resolution of the view.
 * @return {number} The maximum resolution of the view.
 * @api
 */
ol.View.prototype.getMaxResolution = function() {
  return this.maxResolution_;
};


/**
 * Get the minimum resolution of the view.
 * @return {number} The minimum resolution of the view.
 * @api
 */
ol.View.prototype.getMinResolution = function() {
  return this.minResolution_;
};


/**
 * Get the view projection.
 * @return {ol.proj.Projection} The projection of the view.
 * @api stable
 */
ol.View.prototype.getProjection = function() {
  return this.projection_;
};


/**
 * Get the view resolution.
 * @return {number|undefined} The resolution of the view.
 * @observable
 * @api stable
 */
ol.View.prototype.getResolution = function() {
  return /** @type {number|undefined} */ (
      this.get(ol.View.Property.RESOLUTION));
};


/**
 * Get the resolutions for the view. This returns the array of resolutions
 * passed to the constructor of the {ol.View}, or undefined if none were given.
 * @return {Array.<number>|undefined} The resolutions of the view.
 * @api stable
 */
ol.View.prototype.getResolutions = function() {
  return this.resolutions_;
};


/**
 * Get the resolution for a provided extent (in map units) and size (in pixels).
 * @param {ol.Extent} extent Extent.
 * @param {ol.Size} size Box pixel size.
 * @return {number} The resolution at which the provided extent will render at
 *     the given size.
 */
ol.View.prototype.getResolutionForExtent = function(extent, size) {
  var xResolution = ol.extent.getWidth(extent) / size[0];
  var yResolution = ol.extent.getHeight(extent) / size[1];
  return Math.max(xResolution, yResolution);
};


/**
 * Return a function that returns a value between 0 and 1 for a
 * resolution. Exponential scaling is assumed.
 * @param {number=} opt_power Power.
 * @return {function(number): number} Resolution for value function.
 */
ol.View.prototype.getResolutionForValueFunction = function(opt_power) {
  var power = opt_power || 2;
  var maxResolution = this.maxResolution_;
  var minResolution = this.minResolution_;
  var max = Math.log(maxResolution / minResolution) / Math.log(power);
  return (
      /**
       * @param {number} value Value.
       * @return {number} Resolution.
       */
      function(value) {
        var resolution = maxResolution / Math.pow(power, value * max);
        goog.DEBUG && console.assert(resolution >= minResolution &&
            resolution <= maxResolution,
            'calculated resolution outside allowed bounds (%s <= %s <= %s)',
            minResolution, resolution, maxResolution);
        return resolution;
      });
};


/**
 * Get the view rotation.
 * @return {number} The rotation of the view in radians.
 * @observable
 * @api stable
 */
ol.View.prototype.getRotation = function() {
  return /** @type {number} */ (this.get(ol.View.Property.ROTATION));
};


/**
 * Return a function that returns a resolution for a value between
 * 0 and 1. Exponential scaling is assumed.
 * @param {number=} opt_power Power.
 * @return {function(number): number} Value for resolution function.
 */
ol.View.prototype.getValueForResolutionFunction = function(opt_power) {
  var power = opt_power || 2;
  var maxResolution = this.maxResolution_;
  var minResolution = this.minResolution_;
  var max = Math.log(maxResolution / minResolution) / Math.log(power);
  return (
      /**
       * @param {number} resolution Resolution.
       * @return {number} Value.
       */
      function(resolution) {
        var value =
            (Math.log(maxResolution / resolution) / Math.log(power)) / max;
        goog.DEBUG && console.assert(value >= 0 && value <= 1,
            'calculated value (%s) ouside allowed range (0-1)', value);
        return value;
      });
};


/**
 * @return {olx.ViewState} View state.
 */
ol.View.prototype.getState = function() {
  goog.DEBUG && console.assert(this.isDef(),
      'the view was not defined (had no center and/or resolution)');
  var center = /** @type {ol.Coordinate} */ (this.getCenter());
  var projection = this.getProjection();
  var resolution = /** @type {number} */ (this.getResolution());
  var rotation = this.getRotation();
  return /** @type {olx.ViewState} */ ({
    center: center.slice(),
    projection: projection !== undefined ? projection : null,
    resolution: resolution,
    rotation: rotation
  });
};


/**
 * Get the current zoom level. Return undefined if the current
 * resolution is undefined or not within the "resolution constraints".
 * @return {number|undefined} Zoom.
 * @api stable
 */
ol.View.prototype.getZoom = function() {
  var zoom;
  var resolution = this.getResolution();
  if (resolution !== undefined &&
      resolution >= this.minResolution_ && resolution <= this.maxResolution_) {
    var offset = this.minZoom_ || 0;
    var max, zoomFactor;
    if (this.resolutions_) {
      var nearest = ol.array.linearFindNearest(this.resolutions_, resolution, 1);
      offset += nearest;
      if (nearest == this.resolutions_.length - 1) {
        return offset;
      }
      max = this.resolutions_[nearest];
      zoomFactor = max / this.resolutions_[nearest + 1];
    } else {
      max = this.maxResolution_;
      zoomFactor = this.zoomFactor_;
    }
    zoom = offset + Math.log(max / resolution) / Math.log(zoomFactor);
  }
  return zoom;
};


/**
 * Fit the given geometry or extent based on the given map size and border.
 * The size is pixel dimensions of the box to fit the extent into.
 * In most cases you will want to use the map size, that is `map.getSize()`.
 * Takes care of the map angle.
 * @param {ol.geom.SimpleGeometry|ol.Extent} geometry Geometry.
 * @param {ol.Size} size Box pixel size.
 * @param {olx.view.FitOptions=} opt_options Options.
 * @api
 */
ol.View.prototype.fit = function(geometry, size, opt_options) {
  if (!(geometry instanceof ol.geom.SimpleGeometry)) {
    ol.asserts.assert(Array.isArray(geometry),
        24); // Invalid extent or geometry provided as `geometry`
    ol.asserts.assert(!ol.extent.isEmpty(geometry),
        25); // Cannot fit empty extent provided as `geometry`
    geometry = ol.geom.Polygon.fromExtent(geometry);
  }

  var options = opt_options || {};

  var padding = options.padding !== undefined ? options.padding : [0, 0, 0, 0];
  var constrainResolution = options.constrainResolution !== undefined ?
      options.constrainResolution : true;
  var nearest = options.nearest !== undefined ? options.nearest : false;
  var minResolution;
  if (options.minResolution !== undefined) {
    minResolution = options.minResolution;
  } else if (options.maxZoom !== undefined) {
    minResolution = this.constrainResolution(
        this.maxResolution_, options.maxZoom - this.minZoom_, 0);
  } else {
    minResolution = 0;
  }
  var coords = geometry.getFlatCoordinates();

  // calculate rotated extent
  var rotation = this.getRotation();
  goog.DEBUG && console.assert(rotation !== undefined, 'rotation was not defined');
  var cosAngle = Math.cos(-rotation);
  var sinAngle = Math.sin(-rotation);
  var minRotX = +Infinity;
  var minRotY = +Infinity;
  var maxRotX = -Infinity;
  var maxRotY = -Infinity;
  var stride = geometry.getStride();
  for (var i = 0, ii = coords.length; i < ii; i += stride) {
    var rotX = coords[i] * cosAngle - coords[i + 1] * sinAngle;
    var rotY = coords[i] * sinAngle + coords[i + 1] * cosAngle;
    minRotX = Math.min(minRotX, rotX);
    minRotY = Math.min(minRotY, rotY);
    maxRotX = Math.max(maxRotX, rotX);
    maxRotY = Math.max(maxRotY, rotY);
  }

  // calculate resolution
  var resolution = this.getResolutionForExtent(
      [minRotX, minRotY, maxRotX, maxRotY],
      [size[0] - padding[1] - padding[3], size[1] - padding[0] - padding[2]]);
  resolution = isNaN(resolution) ? minResolution :
      Math.max(resolution, minResolution);
  if (constrainResolution) {
    var constrainedResolution = this.constrainResolution(resolution, 0, 0);
    if (!nearest && constrainedResolution < resolution) {
      constrainedResolution = this.constrainResolution(
          constrainedResolution, -1, 0);
    }
    resolution = constrainedResolution;
  }
  this.setResolution(resolution);

  // calculate center
  sinAngle = -sinAngle; // go back to original rotation
  var centerRotX = (minRotX + maxRotX) / 2;
  var centerRotY = (minRotY + maxRotY) / 2;
  centerRotX += (padding[1] - padding[3]) / 2 * resolution;
  centerRotY += (padding[0] - padding[2]) / 2 * resolution;
  var centerX = centerRotX * cosAngle - centerRotY * sinAngle;
  var centerY = centerRotY * cosAngle + centerRotX * sinAngle;

  this.setCenter([centerX, centerY]);
};


/**
 * Center on coordinate and view position.
 * @param {ol.Coordinate} coordinate Coordinate.
 * @param {ol.Size} size Box pixel size.
 * @param {ol.Pixel} position Position on the view to center on.
 * @api
 */
ol.View.prototype.centerOn = function(coordinate, size, position) {
  // calculate rotated position
  var rotation = this.getRotation();
  var cosAngle = Math.cos(-rotation);
  var sinAngle = Math.sin(-rotation);
  var rotX = coordinate[0] * cosAngle - coordinate[1] * sinAngle;
  var rotY = coordinate[1] * cosAngle + coordinate[0] * sinAngle;
  var resolution = this.getResolution();
  rotX += (size[0] / 2 - position[0]) * resolution;
  rotY += (position[1] - size[1] / 2) * resolution;

  // go back to original angle
  sinAngle = -sinAngle; // go back to original rotation
  var centerX = rotX * cosAngle - rotY * sinAngle;
  var centerY = rotY * cosAngle + rotX * sinAngle;

  this.setCenter([centerX, centerY]);
};


/**
 * @return {boolean} Is defined.
 */
ol.View.prototype.isDef = function() {
  return !!this.getCenter() && this.getResolution() !== undefined;
};


/**
 * Rotate the view around a given coordinate.
 * @param {number} rotation New rotation value for the view.
 * @param {ol.Coordinate=} opt_anchor The rotation center.
 * @api stable
 */
ol.View.prototype.rotate = function(rotation, opt_anchor) {
  if (opt_anchor !== undefined) {
    var center = this.calculateCenterRotate(rotation, opt_anchor);
    this.setCenter(center);
  }
  this.setRotation(rotation);
};


/**
 * Set the center of the current view.
 * @param {ol.Coordinate|undefined} center The center of the view.
 * @observable
 * @api stable
 */
ol.View.prototype.setCenter = function(center) {
  this.set(ol.View.Property.CENTER, center);
};


/**
 * @param {ol.View.Hint} hint Hint.
 * @param {number} delta Delta.
 * @return {number} New value.
 */
ol.View.prototype.setHint = function(hint, delta) {
  goog.DEBUG && console.assert(0 <= hint && hint < this.hints_.length,
      'illegal hint (%s), must be between 0 and %s', hint, this.hints_.length);
  this.hints_[hint] += delta;
  goog.DEBUG && console.assert(this.hints_[hint] >= 0,
      'Hint at %s must be positive, was %s', hint, this.hints_[hint]);
  return this.hints_[hint];
};


/**
 * Set the resolution for this view.
 * @param {number|undefined} resolution The resolution of the view.
 * @observable
 * @api stable
 */
ol.View.prototype.setResolution = function(resolution) {
  this.set(ol.View.Property.RESOLUTION, resolution);
};


/**
 * Set the rotation for this view.
 * @param {number} rotation The rotation of the view in radians.
 * @observable
 * @api stable
 */
ol.View.prototype.setRotation = function(rotation) {
  this.set(ol.View.Property.ROTATION, rotation);
};


/**
 * Zoom to a specific zoom level.
 * @param {number} zoom Zoom level.
 * @api stable
 */
ol.View.prototype.setZoom = function(zoom) {
  var resolution = this.constrainResolution(
      this.maxResolution_, zoom - this.minZoom_, 0);
  this.setResolution(resolution);
};


/**
 * @param {olx.ViewOptions} options View options.
 * @private
 * @return {ol.CenterConstraintType} The constraint.
 */
ol.View.createCenterConstraint_ = function(options) {
  if (options.extent !== undefined) {
    return ol.CenterConstraint.createExtent(options.extent);
  } else {
    return ol.CenterConstraint.none;
  }
};


/**
 * @private
 * @param {olx.ViewOptions} options View options.
 * @return {{constraint: ol.ResolutionConstraintType, maxResolution: number,
 *     minResolution: number, zoomFactor: number}} The constraint.
 */
ol.View.createResolutionConstraint_ = function(options) {
  var resolutionConstraint;
  var maxResolution;
  var minResolution;

  // TODO: move these to be ol constants
  // see https://github.com/openlayers/ol3/issues/2076
  var defaultMaxZoom = 28;
  var defaultZoomFactor = 2;

  var minZoom = options.minZoom !== undefined ?
      options.minZoom : ol.DEFAULT_MIN_ZOOM;

  var maxZoom = options.maxZoom !== undefined ?
      options.maxZoom : defaultMaxZoom;

  var zoomFactor = options.zoomFactor !== undefined ?
      options.zoomFactor : defaultZoomFactor;

  if (options.resolutions !== undefined) {
    var resolutions = options.resolutions;
    maxResolution = resolutions[0];
    minResolution = resolutions[resolutions.length - 1];
    resolutionConstraint = ol.ResolutionConstraint.createSnapToResolutions(
        resolutions);
  } else {
    // calculate the default min and max resolution
    var projection = ol.proj.createProjection(options.projection, 'EPSG:3857');
    var extent = projection.getExtent();
    var size = !extent ?
        // use an extent that can fit the whole world if need be
        360 * ol.proj.METERS_PER_UNIT[ol.proj.Units.DEGREES] /
            projection.getMetersPerUnit() :
        Math.max(ol.extent.getWidth(extent), ol.extent.getHeight(extent));

    var defaultMaxResolution = size / ol.DEFAULT_TILE_SIZE / Math.pow(
        defaultZoomFactor, ol.DEFAULT_MIN_ZOOM);

    var defaultMinResolution = defaultMaxResolution / Math.pow(
        defaultZoomFactor, defaultMaxZoom - ol.DEFAULT_MIN_ZOOM);

    // user provided maxResolution takes precedence
    maxResolution = options.maxResolution;
    if (maxResolution !== undefined) {
      minZoom = 0;
    } else {
      maxResolution = defaultMaxResolution / Math.pow(zoomFactor, minZoom);
    }

    // user provided minResolution takes precedence
    minResolution = options.minResolution;
    if (minResolution === undefined) {
      if (options.maxZoom !== undefined) {
        if (options.maxResolution !== undefined) {
          minResolution = maxResolution / Math.pow(zoomFactor, maxZoom);
        } else {
          minResolution = defaultMaxResolution / Math.pow(zoomFactor, maxZoom);
        }
      } else {
        minResolution = defaultMinResolution;
      }
    }

    // given discrete zoom levels, minResolution may be different than provided
    maxZoom = minZoom + Math.floor(
        Math.log(maxResolution / minResolution) / Math.log(zoomFactor));
    minResolution = maxResolution / Math.pow(zoomFactor, maxZoom - minZoom);

    resolutionConstraint = ol.ResolutionConstraint.createSnapToPower(
        zoomFactor, maxResolution, maxZoom - minZoom);
  }
  return {constraint: resolutionConstraint, maxResolution: maxResolution,
    minResolution: minResolution, minZoom: minZoom, zoomFactor: zoomFactor};
};


/**
 * @private
 * @param {olx.ViewOptions} options View options.
 * @return {ol.RotationConstraintType} Rotation constraint.
 */
ol.View.createRotationConstraint_ = function(options) {
  var enableRotation = options.enableRotation !== undefined ?
      options.enableRotation : true;
  if (enableRotation) {
    var constrainRotation = options.constrainRotation;
    if (constrainRotation === undefined || constrainRotation === true) {
      return ol.RotationConstraint.createSnapToZero();
    } else if (constrainRotation === false) {
      return ol.RotationConstraint.none;
    } else if (typeof constrainRotation === 'number') {
      return ol.RotationConstraint.createSnapToN(constrainRotation);
    } else {
      goog.DEBUG && console.assert(false,
          'illegal option for constrainRotation (%s)', constrainRotation);
      return ol.RotationConstraint.none;
    }
  } else {
    return ol.RotationConstraint.disable;
  }
};


/**
 * @enum {string}
 */
ol.View.Property = {
  CENTER: 'center',
  RESOLUTION: 'resolution',
  ROTATION: 'rotation'
};


/**
 * @enum {number}
 */
ol.View.Hint = {
  ANIMATING: 0,
  INTERACTING: 1
};

goog.provide('ol.easing');


/**
 * Start slow and speed up.
 * @param {number} t Input between 0 and 1.
 * @return {number} Output between 0 and 1.
 * @api
 */
ol.easing.easeIn = function(t) {
  return Math.pow(t, 3);
};


/**
 * Start fast and slow down.
 * @param {number} t Input between 0 and 1.
 * @return {number} Output between 0 and 1.
 * @api
 */
ol.easing.easeOut = function(t) {
  return 1 - ol.easing.easeIn(1 - t);
};


/**
 * Start slow, speed up, and then slow down again.
 * @param {number} t Input between 0 and 1.
 * @return {number} Output between 0 and 1.
 * @api
 */
ol.easing.inAndOut = function(t) {
  return 3 * t * t - 2 * t * t * t;
};


/**
 * Maintain a constant speed over time.
 * @param {number} t Input between 0 and 1.
 * @return {number} Output between 0 and 1.
 * @api
 */
ol.easing.linear = function(t) {
  return t;
};


/**
 * Start slow, speed up, and at the very end slow down again.  This has the
 * same general behavior as {@link ol.easing.inAndOut}, but the final slowdown
 * is delayed.
 * @param {number} t Input between 0 and 1.
 * @return {number} Output between 0 and 1.
 * @api
 */
ol.easing.upAndDown = function(t) {
  if (t < 0.5) {
    return ol.easing.inAndOut(2 * t);
  } else {
    return 1 - ol.easing.inAndOut(2 * (t - 0.5));
  }
};

goog.provide('ol.animation');

goog.require('ol');
goog.require('ol.View');
goog.require('ol.coordinate');
goog.require('ol.easing');


/**
 * Generate an animated transition that will "bounce" the resolution as it
 * approaches the final value.
 * @param {olx.animation.BounceOptions} options Bounce options.
 * @return {ol.PreRenderFunction} Pre-render function.
 * @api
 */
ol.animation.bounce = function(options) {
  var resolution = options.resolution;
  var start = options.start ? options.start : Date.now();
  var duration = options.duration !== undefined ? options.duration : 1000;
  var easing = options.easing ?
      options.easing : ol.easing.upAndDown;
  return (
      /**
       * @param {ol.Map} map Map.
       * @param {?olx.FrameState} frameState Frame state.
       * @return {boolean} Run this function in the next frame.
       */
      function(map, frameState) {
        if (frameState.time < start) {
          frameState.animate = true;
          frameState.viewHints[ol.View.Hint.ANIMATING] += 1;
          return true;
        } else if (frameState.time < start + duration) {
          var delta = easing((frameState.time - start) / duration);
          var deltaResolution = resolution - frameState.viewState.resolution;
          frameState.animate = true;
          frameState.viewState.resolution += delta * deltaResolution;
          frameState.viewHints[ol.View.Hint.ANIMATING] += 1;
          return true;
        } else {
          return false;
        }
      });
};


/**
 * Generate an animated transition while updating the view center.
 * @param {olx.animation.PanOptions} options Pan options.
 * @return {ol.PreRenderFunction} Pre-render function.
 * @api
 */
ol.animation.pan = function(options) {
  var source = options.source;
  var start = options.start ? options.start : Date.now();
  var sourceX = source[0];
  var sourceY = source[1];
  var duration = options.duration !== undefined ? options.duration : 1000;
  var easing = options.easing ?
      options.easing : ol.easing.inAndOut;
  return (
      /**
       * @param {ol.Map} map Map.
       * @param {?olx.FrameState} frameState Frame state.
       * @return {boolean} Run this function in the next frame.
       */
      function(map, frameState) {
        if (frameState.time < start) {
          frameState.animate = true;
          frameState.viewHints[ol.View.Hint.ANIMATING] += 1;
          return true;
        } else if (frameState.time < start + duration) {
          var delta = 1 - easing((frameState.time - start) / duration);
          var deltaX = sourceX - frameState.viewState.center[0];
          var deltaY = sourceY - frameState.viewState.center[1];
          frameState.animate = true;
          frameState.viewState.center[0] += delta * deltaX;
          frameState.viewState.center[1] += delta * deltaY;
          frameState.viewHints[ol.View.Hint.ANIMATING] += 1;
          return true;
        } else {
          return false;
        }
      });
};


/**
 * Generate an animated transition while updating the view rotation.
 * @param {olx.animation.RotateOptions} options Rotate options.
 * @return {ol.PreRenderFunction} Pre-render function.
 * @api
 */
ol.animation.rotate = function(options) {
  var sourceRotation = options.rotation ? options.rotation : 0;
  var start = options.start ? options.start : Date.now();
  var duration = options.duration !== undefined ? options.duration : 1000;
  var easing = options.easing ?
      options.easing : ol.easing.inAndOut;
  var anchor = options.anchor ?
      options.anchor : null;

  return (
      /**
       * @param {ol.Map} map Map.
       * @param {?olx.FrameState} frameState Frame state.
       * @return {boolean} Run this function in the next frame.
       */
      function(map, frameState) {
        if (frameState.time < start) {
          frameState.animate = true;
          frameState.viewHints[ol.View.Hint.ANIMATING] += 1;
          return true;
        } else if (frameState.time < start + duration) {
          var delta = 1 - easing((frameState.time - start) / duration);
          var deltaRotation =
              (sourceRotation - frameState.viewState.rotation) * delta;
          frameState.animate = true;
          frameState.viewState.rotation += deltaRotation;
          if (anchor) {
            var center = frameState.viewState.center;
            ol.coordinate.sub(center, anchor);
            ol.coordinate.rotate(center, deltaRotation);
            ol.coordinate.add(center, anchor);
          }
          frameState.viewHints[ol.View.Hint.ANIMATING] += 1;
          return true;
        } else {
          return false;
        }
      });
};


/**
 * Generate an animated transition while updating the view resolution.
 * @param {olx.animation.ZoomOptions} options Zoom options.
 * @return {ol.PreRenderFunction} Pre-render function.
 * @api
 */
ol.animation.zoom = function(options) {
  var sourceResolution = options.resolution;
  var start = options.start ? options.start : Date.now();
  var duration = options.duration !== undefined ? options.duration : 1000;
  var easing = options.easing ?
      options.easing : ol.easing.inAndOut;
  return (
      /**
       * @param {ol.Map} map Map.
       * @param {?olx.FrameState} frameState Frame state.
       * @return {boolean} Run this function in the next frame.
       */
      function(map, frameState) {
        if (frameState.time < start) {
          frameState.animate = true;
          frameState.viewHints[ol.View.Hint.ANIMATING] += 1;
          return true;
        } else if (frameState.time < start + duration) {
          var delta = 1 - easing((frameState.time - start) / duration);
          var deltaResolution =
              sourceResolution - frameState.viewState.resolution;
          frameState.animate = true;
          frameState.viewState.resolution += delta * deltaResolution;
          frameState.viewHints[ol.View.Hint.ANIMATING] += 1;
          return true;
        } else {
          return false;
        }
      });
};

goog.provide('ol.TileRange');

goog.require('ol.asserts');


/**
 * A representation of a contiguous block of tiles.  A tile range is specified
 * by its min/max tile coordinates and is inclusive of coordinates.
 *
 * @constructor
 * @param {number} minX Minimum X.
 * @param {number} maxX Maximum X.
 * @param {number} minY Minimum Y.
 * @param {number} maxY Maximum Y.
 * @struct
 */
ol.TileRange = function(minX, maxX, minY, maxY) {

  /**
   * @type {number}
   */
  this.minX = minX;

  /**
   * @type {number}
   */
  this.maxX = maxX;

  /**
   * @type {number}
   */
  this.minY = minY;

  /**
   * @type {number}
   */
  this.maxY = maxY;

};


/**
 * @param {...ol.TileCoord} var_args Tile coordinates.
 * @return {!ol.TileRange} Bounding tile box.
 */
ol.TileRange.boundingTileRange = function(var_args) {
  var tileCoord0 = /** @type {ol.TileCoord} */ (arguments[0]);
  var tileCoord0Z = tileCoord0[0];
  var tileCoord0X = tileCoord0[1];
  var tileCoord0Y = tileCoord0[2];
  var tileRange = new ol.TileRange(tileCoord0X, tileCoord0X,
                                   tileCoord0Y, tileCoord0Y);
  var i, ii, tileCoord, tileCoordX, tileCoordY, tileCoordZ;
  for (i = 1, ii = arguments.length; i < ii; ++i) {
    tileCoord = /** @type {ol.TileCoord} */ (arguments[i]);
    tileCoordZ = tileCoord[0];
    tileCoordX = tileCoord[1];
    tileCoordY = tileCoord[2];
    ol.asserts.assert(tileCoordZ == tileCoord0Z,
        23); // The passed `ol.TileCoord`s must all have the same `z` value
    tileRange.minX = Math.min(tileRange.minX, tileCoordX);
    tileRange.maxX = Math.max(tileRange.maxX, tileCoordX);
    tileRange.minY = Math.min(tileRange.minY, tileCoordY);
    tileRange.maxY = Math.max(tileRange.maxY, tileCoordY);
  }
  return tileRange;
};


/**
 * @param {number} minX Minimum X.
 * @param {number} maxX Maximum X.
 * @param {number} minY Minimum Y.
 * @param {number} maxY Maximum Y.
 * @param {ol.TileRange|undefined} tileRange TileRange.
 * @return {ol.TileRange} Tile range.
 */
ol.TileRange.createOrUpdate = function(minX, maxX, minY, maxY, tileRange) {
  if (tileRange !== undefined) {
    tileRange.minX = minX;
    tileRange.maxX = maxX;
    tileRange.minY = minY;
    tileRange.maxY = maxY;
    return tileRange;
  } else {
    return new ol.TileRange(minX, maxX, minY, maxY);
  }
};


/**
 * @param {ol.TileCoord} tileCoord Tile coordinate.
 * @return {boolean} Contains tile coordinate.
 */
ol.TileRange.prototype.contains = function(tileCoord) {
  return this.containsXY(tileCoord[1], tileCoord[2]);
};


/**
 * @param {ol.TileRange} tileRange Tile range.
 * @return {boolean} Contains.
 */
ol.TileRange.prototype.containsTileRange = function(tileRange) {
  return this.minX <= tileRange.minX && tileRange.maxX <= this.maxX &&
      this.minY <= tileRange.minY && tileRange.maxY <= this.maxY;
};


/**
 * @param {number} x Tile coordinate x.
 * @param {number} y Tile coordinate y.
 * @return {boolean} Contains coordinate.
 */
ol.TileRange.prototype.containsXY = function(x, y) {
  return this.minX <= x && x <= this.maxX && this.minY <= y && y <= this.maxY;
};


/**
 * @param {ol.TileRange} tileRange Tile range.
 * @return {boolean} Equals.
 */
ol.TileRange.prototype.equals = function(tileRange) {
  return this.minX == tileRange.minX && this.minY == tileRange.minY &&
      this.maxX == tileRange.maxX && this.maxY == tileRange.maxY;
};


/**
 * @param {ol.TileRange} tileRange Tile range.
 */
ol.TileRange.prototype.extend = function(tileRange) {
  if (tileRange.minX < this.minX) {
    this.minX = tileRange.minX;
  }
  if (tileRange.maxX > this.maxX) {
    this.maxX = tileRange.maxX;
  }
  if (tileRange.minY < this.minY) {
    this.minY = tileRange.minY;
  }
  if (tileRange.maxY > this.maxY) {
    this.maxY = tileRange.maxY;
  }
};


/**
 * @return {number} Height.
 */
ol.TileRange.prototype.getHeight = function() {
  return this.maxY - this.minY + 1;
};


/**
 * @return {ol.Size} Size.
 */
ol.TileRange.prototype.getSize = function() {
  return [this.getWidth(), this.getHeight()];
};


/**
 * @return {number} Width.
 */
ol.TileRange.prototype.getWidth = function() {
  return this.maxX - this.minX + 1;
};


/**
 * @param {ol.TileRange} tileRange Tile range.
 * @return {boolean} Intersects.
 */
ol.TileRange.prototype.intersects = function(tileRange) {
  return this.minX <= tileRange.maxX &&
      this.maxX >= tileRange.minX &&
      this.minY <= tileRange.maxY &&
      this.maxY >= tileRange.minY;
};

goog.provide('ol.size');


/**
 * Returns a buffered size.
 * @param {ol.Size} size Size.
 * @param {number} buffer Buffer.
 * @param {ol.Size=} opt_size Optional reusable size array.
 * @return {ol.Size} The buffered size.
 */
ol.size.buffer = function(size, buffer, opt_size) {
  if (opt_size === undefined) {
    opt_size = [0, 0];
  }
  opt_size[0] = size[0] + 2 * buffer;
  opt_size[1] = size[1] + 2 * buffer;
  return opt_size;
};


/**
 * Compares sizes for equality.
 * @param {ol.Size} a Size.
 * @param {ol.Size} b Size.
 * @return {boolean} Equals.
 */
ol.size.equals = function(a, b) {
  return a[0] == b[0] && a[1] == b[1];
};


/**
 * Determines if a size has a positive area.
 * @param {ol.Size} size The size to test.
 * @return {boolean} The size has a positive area.
 */
ol.size.hasArea = function(size) {
  return size[0] > 0 && size[1] > 0;
};


/**
 * Returns a size scaled by a ratio. The result will be an array of integers.
 * @param {ol.Size} size Size.
 * @param {number} ratio Ratio.
 * @param {ol.Size=} opt_size Optional reusable size array.
 * @return {ol.Size} The scaled size.
 */
ol.size.scale = function(size, ratio, opt_size) {
  if (opt_size === undefined) {
    opt_size = [0, 0];
  }
  opt_size[0] = (size[0] * ratio + 0.5) | 0;
  opt_size[1] = (size[1] * ratio + 0.5) | 0;
  return opt_size;
};


/**
 * Returns an `ol.Size` array for the passed in number (meaning: square) or
 * `ol.Size` array.
 * (meaning: non-square),
 * @param {number|ol.Size} size Width and height.
 * @param {ol.Size=} opt_size Optional reusable size array.
 * @return {ol.Size} Size.
 * @api stable
 */
ol.size.toSize = function(size, opt_size) {
  if (Array.isArray(size)) {
    return size;
  } else {
    if (opt_size === undefined) {
      opt_size = [size, size];
    } else {
      opt_size[0] = opt_size[1] = /** @type {number} */ (size);
    }
    return opt_size;
  }
};

goog.provide('ol.tilecoord');


/**
 * @enum {number}
 */
ol.QuadKeyCharCode = {
  ZERO: '0'.charCodeAt(0),
  ONE: '1'.charCodeAt(0),
  TWO: '2'.charCodeAt(0),
  THREE: '3'.charCodeAt(0)
};


/**
 * @param {string} str String that follows pattern “z/x/y” where x, y and z are
 *   numbers.
 * @return {ol.TileCoord} Tile coord.
 */
ol.tilecoord.createFromString = function(str) {
  var v = str.split('/');
  goog.DEBUG && console.assert(v.length === 3,
      'must provide a string in "z/x/y" format, got "%s"', str);
  return v.map(function(e) {
    return parseInt(e, 10);
  });
};


/**
 * @param {number} z Z.
 * @param {number} x X.
 * @param {number} y Y.
 * @param {ol.TileCoord=} opt_tileCoord Tile coordinate.
 * @return {ol.TileCoord} Tile coordinate.
 */
ol.tilecoord.createOrUpdate = function(z, x, y, opt_tileCoord) {
  if (opt_tileCoord !== undefined) {
    opt_tileCoord[0] = z;
    opt_tileCoord[1] = x;
    opt_tileCoord[2] = y;
    return opt_tileCoord;
  } else {
    return [z, x, y];
  }
};


/**
 * @param {number} z Z.
 * @param {number} x X.
 * @param {number} y Y.
 * @return {string} Key.
 */
ol.tilecoord.getKeyZXY = function(z, x, y) {
  return z + '/' + x + '/' + y;
};


/**
 * @param {ol.TileCoord} tileCoord Tile coord.
 * @return {number} Hash.
 */
ol.tilecoord.hash = function(tileCoord) {
  return (tileCoord[1] << tileCoord[0]) + tileCoord[2];
};


/**
 * @param {ol.TileCoord} tileCoord Tile coord.
 * @return {string} Quad key.
 */
ol.tilecoord.quadKey = function(tileCoord) {
  var z = tileCoord[0];
  var digits = new Array(z);
  var mask = 1 << (z - 1);
  var i, charCode;
  for (i = 0; i < z; ++i) {
    charCode = ol.QuadKeyCharCode.ZERO;
    if (tileCoord[1] & mask) {
      charCode += 1;
    }
    if (tileCoord[2] & mask) {
      charCode += 2;
    }
    digits[i] = String.fromCharCode(charCode);
    mask >>= 1;
  }
  return digits.join('');
};


/**
 * @param {ol.TileCoord} tileCoord Tile coordinate.
 * @param {!ol.tilegrid.TileGrid} tileGrid Tile grid.
 * @return {boolean} Tile coordinate is within extent and zoom level range.
 */
ol.tilecoord.withinExtentAndZ = function(tileCoord, tileGrid) {
  var z = tileCoord[0];
  var x = tileCoord[1];
  var y = tileCoord[2];

  if (tileGrid.getMinZoom() > z || z > tileGrid.getMaxZoom()) {
    return false;
  }
  var extent = tileGrid.getExtent();
  var tileRange;
  if (!extent) {
    tileRange = tileGrid.getFullTileRange(z);
  } else {
    tileRange = tileGrid.getTileRangeForExtentAndZ(extent, z);
  }
  if (!tileRange) {
    return true;
  } else {
    return tileRange.containsXY(x, y);
  }
};

goog.provide('ol.tilegrid.TileGrid');

goog.require('ol');
goog.require('ol.asserts');
goog.require('ol.TileRange');
goog.require('ol.array');
goog.require('ol.extent');
goog.require('ol.math');
goog.require('ol.size');
goog.require('ol.tilecoord');


/**
 * @classdesc
 * Base class for setting the grid pattern for sources accessing tiled-image
 * servers.
 *
 * @constructor
 * @param {olx.tilegrid.TileGridOptions} options Tile grid options.
 * @struct
 * @api stable
 */
ol.tilegrid.TileGrid = function(options) {

  /**
   * @protected
   * @type {number}
   */
  this.minZoom = options.minZoom !== undefined ? options.minZoom : 0;

  /**
   * @private
   * @type {!Array.<number>}
   */
  this.resolutions_ = options.resolutions;
  ol.asserts.assert(ol.array.isSorted(this.resolutions_, function(a, b) {
    return b - a;
  }, true), 17); // `resolutions` must be sorted in descending order

  /**
   * @protected
   * @type {number}
   */
  this.maxZoom = this.resolutions_.length - 1;

  /**
   * @private
   * @type {ol.Coordinate}
   */
  this.origin_ = options.origin !== undefined ? options.origin : null;

  /**
   * @private
   * @type {Array.<ol.Coordinate>}
   */
  this.origins_ = null;
  if (options.origins !== undefined) {
    this.origins_ = options.origins;
    ol.asserts.assert(this.origins_.length == this.resolutions_.length,
        20); // Number of `origins` and `resolutions` must be equal
  }

  var extent = options.extent;

  if (extent !== undefined &&
      !this.origin_ && !this.origins_) {
    this.origin_ = ol.extent.getTopLeft(extent);
  }

  ol.asserts.assert(
      (!this.origin_ && this.origins_) || (this.origin_ && !this.origins_),
      18); // Either `origin` or `origins` must be configured, never both

  /**
   * @private
   * @type {Array.<number|ol.Size>}
   */
  this.tileSizes_ = null;
  if (options.tileSizes !== undefined) {
    this.tileSizes_ = options.tileSizes;
    ol.asserts.assert(this.tileSizes_.length == this.resolutions_.length,
        19); // Number of `tileSizes` and `resolutions` must be equal
  }

  /**
   * @private
   * @type {number|ol.Size}
   */
  this.tileSize_ = options.tileSize !== undefined ?
      options.tileSize :
      !this.tileSizes_ ? ol.DEFAULT_TILE_SIZE : null;
  ol.asserts.assert(
      (!this.tileSize_ && this.tileSizes_) ||
      (this.tileSize_ && !this.tileSizes_),
      22); // Either `tileSize` or `tileSizes` must be configured, never both

  /**
   * @private
   * @type {ol.Extent}
   */
  this.extent_ = extent !== undefined ? extent : null;


  /**
   * @private
   * @type {Array.<ol.TileRange>}
   */
  this.fullTileRanges_ = null;

  /**
   * @private
   * @type {ol.Size}
   */
  this.tmpSize_ = [0, 0];

  if (options.sizes !== undefined) {
    goog.DEBUG && console.assert(options.sizes.length == this.resolutions_.length,
        'number of sizes and resolutions must be equal');
    this.fullTileRanges_ = options.sizes.map(function(size, z) {
      goog.DEBUG && console.assert(size[0] !== 0, 'width must not be 0');
      goog.DEBUG && console.assert(size[1] !== 0, 'height must not be 0');
      var tileRange = new ol.TileRange(
          Math.min(0, size[0]), Math.max(size[0] - 1, -1),
          Math.min(0, size[1]), Math.max(size[1] - 1, -1));
      return tileRange;
    }, this);
  } else if (extent) {
    this.calculateTileRanges_(extent);
  }

};


/**
 * @private
 * @type {ol.TileCoord}
 */
ol.tilegrid.TileGrid.tmpTileCoord_ = [0, 0, 0];


/**
 * Call a function with each tile coordinate for a given extent and zoom level.
 *
 * @param {ol.Extent} extent Extent.
 * @param {number} zoom Zoom level.
 * @param {function(ol.TileCoord)} callback Function called with each tile coordinate.
 * @api
 */
ol.tilegrid.TileGrid.prototype.forEachTileCoord = function(extent, zoom, callback) {
  var tileRange = this.getTileRangeForExtentAndZ(extent, zoom);
  for (var i = tileRange.minX, ii = tileRange.maxX; i <= ii; ++i) {
    for (var j = tileRange.minY, jj = tileRange.maxY; j <= jj; ++j) {
      callback([zoom, i, j]);
    }
  }
};


/**
 * @param {ol.TileCoord} tileCoord Tile coordinate.
 * @param {function(this: T, number, ol.TileRange): boolean} callback Callback.
 * @param {T=} opt_this The object to use as `this` in `callback`.
 * @param {ol.TileRange=} opt_tileRange Temporary ol.TileRange object.
 * @param {ol.Extent=} opt_extent Temporary ol.Extent object.
 * @return {boolean} Callback succeeded.
 * @template T
 */
ol.tilegrid.TileGrid.prototype.forEachTileCoordParentTileRange = function(tileCoord, callback, opt_this, opt_tileRange, opt_extent) {
  var tileCoordExtent = this.getTileCoordExtent(tileCoord, opt_extent);
  var z = tileCoord[0] - 1;
  while (z >= this.minZoom) {
    if (callback.call(opt_this, z,
        this.getTileRangeForExtentAndZ(tileCoordExtent, z, opt_tileRange))) {
      return true;
    }
    --z;
  }
  return false;
};


/**
 * Get the extent for this tile grid, if it was configured.
 * @return {ol.Extent} Extent.
 */
ol.tilegrid.TileGrid.prototype.getExtent = function() {
  return this.extent_;
};


/**
 * Get the maximum zoom level for the grid.
 * @return {number} Max zoom.
 * @api
 */
ol.tilegrid.TileGrid.prototype.getMaxZoom = function() {
  return this.maxZoom;
};


/**
 * Get the minimum zoom level for the grid.
 * @return {number} Min zoom.
 * @api
 */
ol.tilegrid.TileGrid.prototype.getMinZoom = function() {
  return this.minZoom;
};


/**
 * Get the origin for the grid at the given zoom level.
 * @param {number} z Z.
 * @return {ol.Coordinate} Origin.
 * @api stable
 */
ol.tilegrid.TileGrid.prototype.getOrigin = function(z) {
  if (this.origin_) {
    return this.origin_;
  } else {
    goog.DEBUG && console.assert(this.minZoom <= z && z <= this.maxZoom,
        'given z is not in allowed range (%s <= %s <= %s)',
        this.minZoom, z, this.maxZoom);
    return this.origins_[z];
  }
};


/**
 * Get the resolution for the given zoom level.
 * @param {number} z Z.
 * @return {number} Resolution.
 * @api stable
 */
ol.tilegrid.TileGrid.prototype.getResolution = function(z) {
  goog.DEBUG && console.assert(this.minZoom <= z && z <= this.maxZoom,
      'given z is not in allowed range (%s <= %s <= %s)',
      this.minZoom, z, this.maxZoom);
  return this.resolutions_[z];
};


/**
 * Get the list of resolutions for the tile grid.
 * @return {Array.<number>} Resolutions.
 * @api stable
 */
ol.tilegrid.TileGrid.prototype.getResolutions = function() {
  return this.resolutions_;
};


/**
 * @param {ol.TileCoord} tileCoord Tile coordinate.
 * @param {ol.TileRange=} opt_tileRange Temporary ol.TileRange object.
 * @param {ol.Extent=} opt_extent Temporary ol.Extent object.
 * @return {ol.TileRange} Tile range.
 */
ol.tilegrid.TileGrid.prototype.getTileCoordChildTileRange = function(tileCoord, opt_tileRange, opt_extent) {
  if (tileCoord[0] < this.maxZoom) {
    var tileCoordExtent = this.getTileCoordExtent(tileCoord, opt_extent);
    return this.getTileRangeForExtentAndZ(
        tileCoordExtent, tileCoord[0] + 1, opt_tileRange);
  } else {
    return null;
  }
};


/**
 * @param {number} z Z.
 * @param {ol.TileRange} tileRange Tile range.
 * @param {ol.Extent=} opt_extent Temporary ol.Extent object.
 * @return {ol.Extent} Extent.
 */
ol.tilegrid.TileGrid.prototype.getTileRangeExtent = function(z, tileRange, opt_extent) {
  var origin = this.getOrigin(z);
  var resolution = this.getResolution(z);
  var tileSize = ol.size.toSize(this.getTileSize(z), this.tmpSize_);
  var minX = origin[0] + tileRange.minX * tileSize[0] * resolution;
  var maxX = origin[0] + (tileRange.maxX + 1) * tileSize[0] * resolution;
  var minY = origin[1] + tileRange.minY * tileSize[1] * resolution;
  var maxY = origin[1] + (tileRange.maxY + 1) * tileSize[1] * resolution;
  return ol.extent.createOrUpdate(minX, minY, maxX, maxY, opt_extent);
};


/**
 * @param {ol.Extent} extent Extent.
 * @param {number} resolution Resolution.
 * @param {ol.TileRange=} opt_tileRange Temporary tile range object.
 * @return {ol.TileRange} Tile range.
 */
ol.tilegrid.TileGrid.prototype.getTileRangeForExtentAndResolution = function(extent, resolution, opt_tileRange) {
  var tileCoord = ol.tilegrid.TileGrid.tmpTileCoord_;
  this.getTileCoordForXYAndResolution_(
      extent[0], extent[1], resolution, false, tileCoord);
  var minX = tileCoord[1];
  var minY = tileCoord[2];
  this.getTileCoordForXYAndResolution_(
      extent[2], extent[3], resolution, true, tileCoord);
  return ol.TileRange.createOrUpdate(
      minX, tileCoord[1], minY, tileCoord[2], opt_tileRange);
};


/**
 * @param {ol.Extent} extent Extent.
 * @param {number} z Z.
 * @param {ol.TileRange=} opt_tileRange Temporary tile range object.
 * @return {ol.TileRange} Tile range.
 */
ol.tilegrid.TileGrid.prototype.getTileRangeForExtentAndZ = function(extent, z, opt_tileRange) {
  var resolution = this.getResolution(z);
  return this.getTileRangeForExtentAndResolution(
      extent, resolution, opt_tileRange);
};


/**
 * @param {ol.TileCoord} tileCoord Tile coordinate.
 * @return {ol.Coordinate} Tile center.
 */
ol.tilegrid.TileGrid.prototype.getTileCoordCenter = function(tileCoord) {
  var origin = this.getOrigin(tileCoord[0]);
  var resolution = this.getResolution(tileCoord[0]);
  var tileSize = ol.size.toSize(this.getTileSize(tileCoord[0]), this.tmpSize_);
  return [
    origin[0] + (tileCoord[1] + 0.5) * tileSize[0] * resolution,
    origin[1] + (tileCoord[2] + 0.5) * tileSize[1] * resolution
  ];
};


/**
 * Get the extent of a tile coordinate.
 *
 * @param {ol.TileCoord} tileCoord Tile coordinate.
 * @param {ol.Extent=} opt_extent Temporary extent object.
 * @return {ol.Extent} Extent.
 * @api
 */
ol.tilegrid.TileGrid.prototype.getTileCoordExtent = function(tileCoord, opt_extent) {
  var origin = this.getOrigin(tileCoord[0]);
  var resolution = this.getResolution(tileCoord[0]);
  var tileSize = ol.size.toSize(this.getTileSize(tileCoord[0]), this.tmpSize_);
  var minX = origin[0] + tileCoord[1] * tileSize[0] * resolution;
  var minY = origin[1] + tileCoord[2] * tileSize[1] * resolution;
  var maxX = minX + tileSize[0] * resolution;
  var maxY = minY + tileSize[1] * resolution;
  return ol.extent.createOrUpdate(minX, minY, maxX, maxY, opt_extent);
};


/**
 * Get the tile coordinate for the given map coordinate and resolution.  This
 * method considers that coordinates that intersect tile boundaries should be
 * assigned the higher tile coordinate.
 *
 * @param {ol.Coordinate} coordinate Coordinate.
 * @param {number} resolution Resolution.
 * @param {ol.TileCoord=} opt_tileCoord Destination ol.TileCoord object.
 * @return {ol.TileCoord} Tile coordinate.
 * @api
 */
ol.tilegrid.TileGrid.prototype.getTileCoordForCoordAndResolution = function(coordinate, resolution, opt_tileCoord) {
  return this.getTileCoordForXYAndResolution_(
      coordinate[0], coordinate[1], resolution, false, opt_tileCoord);
};


/**
 * @param {number} x X.
 * @param {number} y Y.
 * @param {number} resolution Resolution.
 * @param {boolean} reverseIntersectionPolicy Instead of letting edge
 *     intersections go to the higher tile coordinate, let edge intersections
 *     go to the lower tile coordinate.
 * @param {ol.TileCoord=} opt_tileCoord Temporary ol.TileCoord object.
 * @return {ol.TileCoord} Tile coordinate.
 * @private
 */
ol.tilegrid.TileGrid.prototype.getTileCoordForXYAndResolution_ = function(
    x, y, resolution, reverseIntersectionPolicy, opt_tileCoord) {
  var z = this.getZForResolution(resolution);
  var scale = resolution / this.getResolution(z);
  var origin = this.getOrigin(z);
  var tileSize = ol.size.toSize(this.getTileSize(z), this.tmpSize_);

  var adjustX = reverseIntersectionPolicy ? 0.5 : 0;
  var adjustY = reverseIntersectionPolicy ? 0 : 0.5;
  var xFromOrigin = Math.floor((x - origin[0]) / resolution + adjustX);
  var yFromOrigin = Math.floor((y - origin[1]) / resolution + adjustY);
  var tileCoordX = scale * xFromOrigin / tileSize[0];
  var tileCoordY = scale * yFromOrigin / tileSize[1];

  if (reverseIntersectionPolicy) {
    tileCoordX = Math.ceil(tileCoordX) - 1;
    tileCoordY = Math.ceil(tileCoordY) - 1;
  } else {
    tileCoordX = Math.floor(tileCoordX);
    tileCoordY = Math.floor(tileCoordY);
  }

  return ol.tilecoord.createOrUpdate(z, tileCoordX, tileCoordY, opt_tileCoord);
};


/**
 * Get a tile coordinate given a map coordinate and zoom level.
 * @param {ol.Coordinate} coordinate Coordinate.
 * @param {number} z Zoom level.
 * @param {ol.TileCoord=} opt_tileCoord Destination ol.TileCoord object.
 * @return {ol.TileCoord} Tile coordinate.
 * @api
 */
ol.tilegrid.TileGrid.prototype.getTileCoordForCoordAndZ = function(coordinate, z, opt_tileCoord) {
  var resolution = this.getResolution(z);
  return this.getTileCoordForXYAndResolution_(
      coordinate[0], coordinate[1], resolution, false, opt_tileCoord);
};


/**
 * @param {ol.TileCoord} tileCoord Tile coordinate.
 * @return {number} Tile resolution.
 */
ol.tilegrid.TileGrid.prototype.getTileCoordResolution = function(tileCoord) {
  goog.DEBUG && console.assert(
      this.minZoom <= tileCoord[0] && tileCoord[0] <= this.maxZoom,
      'z of given tilecoord is not in allowed range (%s <= %s <= %s',
      this.minZoom, tileCoord[0], this.maxZoom);
  return this.resolutions_[tileCoord[0]];
};


/**
 * Get the tile size for a zoom level. The type of the return value matches the
 * `tileSize` or `tileSizes` that the tile grid was configured with. To always
 * get an `ol.Size`, run the result through `ol.size.toSize()`.
 * @param {number} z Z.
 * @return {number|ol.Size} Tile size.
 * @api stable
 */
ol.tilegrid.TileGrid.prototype.getTileSize = function(z) {
  if (this.tileSize_) {
    return this.tileSize_;
  } else {
    goog.DEBUG && console.assert(this.minZoom <= z && z <= this.maxZoom,
        'z is not in allowed range (%s <= %s <= %s',
        this.minZoom, z, this.maxZoom);
    return this.tileSizes_[z];
  }
};


/**
 * @param {number} z Zoom level.
 * @return {ol.TileRange} Extent tile range for the specified zoom level.
 */
ol.tilegrid.TileGrid.prototype.getFullTileRange = function(z) {
  if (!this.fullTileRanges_) {
    return null;
  } else {
    goog.DEBUG && console.assert(this.minZoom <= z && z <= this.maxZoom,
        'z is not in allowed range (%s <= %s <= %s',
        this.minZoom, z, this.maxZoom);
    return this.fullTileRanges_[z];
  }
};


/**
 * @param {number} resolution Resolution.
 * @param {number=} opt_direction If 0, the nearest resolution will be used.
 *     If 1, the nearest lower resolution will be used. If -1, the nearest
 *     higher resolution will be used. Default is 0.
 * @return {number} Z.
 * @api
 */
ol.tilegrid.TileGrid.prototype.getZForResolution = function(
    resolution, opt_direction) {
  var z = ol.array.linearFindNearest(this.resolutions_, resolution,
      opt_direction || 0);
  return ol.math.clamp(z, this.minZoom, this.maxZoom);
};


/**
 * @param {!ol.Extent} extent Extent for this tile grid.
 * @private
 */
ol.tilegrid.TileGrid.prototype.calculateTileRanges_ = function(extent) {
  var length = this.resolutions_.length;
  var fullTileRanges = new Array(length);
  for (var z = this.minZoom; z < length; ++z) {
    fullTileRanges[z] = this.getTileRangeForExtentAndZ(extent, z);
  }
  this.fullTileRanges_ = fullTileRanges;
};

goog.provide('ol.tilegrid');

goog.require('ol');
goog.require('ol.size');
goog.require('ol.extent');
goog.require('ol.extent.Corner');
goog.require('ol.obj');
goog.require('ol.proj');
goog.require('ol.proj.METERS_PER_UNIT');
goog.require('ol.proj.Units');
goog.require('ol.tilegrid.TileGrid');


/**
 * @param {ol.proj.Projection} projection Projection.
 * @return {!ol.tilegrid.TileGrid} Default tile grid for the passed projection.
 */
ol.tilegrid.getForProjection = function(projection) {
  var tileGrid = projection.getDefaultTileGrid();
  if (!tileGrid) {
    tileGrid = ol.tilegrid.createForProjection(projection);
    projection.setDefaultTileGrid(tileGrid);
  }
  return tileGrid;
};


/**
 * @param {ol.tilegrid.TileGrid} tileGrid Tile grid.
 * @param {ol.TileCoord} tileCoord Tile coordinate.
 * @param {ol.proj.Projection} projection Projection.
 * @return {ol.TileCoord} Tile coordinate.
 */
ol.tilegrid.wrapX = function(tileGrid, tileCoord, projection) {
  var z = tileCoord[0];
  var center = tileGrid.getTileCoordCenter(tileCoord);
  var projectionExtent = ol.tilegrid.extentFromProjection(projection);
  if (!ol.extent.containsCoordinate(projectionExtent, center)) {
    var worldWidth = ol.extent.getWidth(projectionExtent);
    var worldsAway = Math.ceil((projectionExtent[0] - center[0]) / worldWidth);
    center[0] += worldWidth * worldsAway;
    return tileGrid.getTileCoordForCoordAndZ(center, z);
  } else {
    return tileCoord;
  }
};


/**
 * @param {ol.Extent} extent Extent.
 * @param {number=} opt_maxZoom Maximum zoom level (default is
 *     ol.DEFAULT_MAX_ZOOM).
 * @param {number|ol.Size=} opt_tileSize Tile size (default uses
 *     ol.DEFAULT_TILE_SIZE).
 * @param {ol.extent.Corner=} opt_corner Extent corner (default is
 *     ol.extent.Corner.TOP_LEFT).
 * @return {!ol.tilegrid.TileGrid} TileGrid instance.
 */
ol.tilegrid.createForExtent = function(extent, opt_maxZoom, opt_tileSize, opt_corner) {
  var corner = opt_corner !== undefined ?
      opt_corner : ol.extent.Corner.TOP_LEFT;

  var resolutions = ol.tilegrid.resolutionsFromExtent(
      extent, opt_maxZoom, opt_tileSize);

  return new ol.tilegrid.TileGrid({
    extent: extent,
    origin: ol.extent.getCorner(extent, corner),
    resolutions: resolutions,
    tileSize: opt_tileSize
  });
};


/**
 * Creates a tile grid with a standard XYZ tiling scheme.
 * @param {olx.tilegrid.XYZOptions=} opt_options Tile grid options.
 * @return {ol.tilegrid.TileGrid} Tile grid instance.
 * @api
 */
ol.tilegrid.createXYZ = function(opt_options) {
  var options = /** @type {olx.tilegrid.TileGridOptions} */ ({});
  ol.obj.assign(options, opt_options !== undefined ?
      opt_options : /** @type {olx.tilegrid.XYZOptions} */ ({}));
  if (options.extent === undefined) {
    options.extent = ol.proj.get('EPSG:3857').getExtent();
  }
  options.resolutions = ol.tilegrid.resolutionsFromExtent(
      options.extent, options.maxZoom, options.tileSize);
  delete options.maxZoom;

  return new ol.tilegrid.TileGrid(options);
};


/**
 * Create a resolutions array from an extent.  A zoom factor of 2 is assumed.
 * @param {ol.Extent} extent Extent.
 * @param {number=} opt_maxZoom Maximum zoom level (default is
 *     ol.DEFAULT_MAX_ZOOM).
 * @param {number|ol.Size=} opt_tileSize Tile size (default uses
 *     ol.DEFAULT_TILE_SIZE).
 * @return {!Array.<number>} Resolutions array.
 */
ol.tilegrid.resolutionsFromExtent = function(extent, opt_maxZoom, opt_tileSize) {
  var maxZoom = opt_maxZoom !== undefined ?
      opt_maxZoom : ol.DEFAULT_MAX_ZOOM;

  var height = ol.extent.getHeight(extent);
  var width = ol.extent.getWidth(extent);

  var tileSize = ol.size.toSize(opt_tileSize !== undefined ?
      opt_tileSize : ol.DEFAULT_TILE_SIZE);
  var maxResolution = Math.max(
      width / tileSize[0], height / tileSize[1]);

  var length = maxZoom + 1;
  var resolutions = new Array(length);
  for (var z = 0; z < length; ++z) {
    resolutions[z] = maxResolution / Math.pow(2, z);
  }
  return resolutions;
};


/**
 * @param {ol.ProjectionLike} projection Projection.
 * @param {number=} opt_maxZoom Maximum zoom level (default is
 *     ol.DEFAULT_MAX_ZOOM).
 * @param {ol.Size=} opt_tileSize Tile size (default uses ol.DEFAULT_TILE_SIZE).
 * @param {ol.extent.Corner=} opt_corner Extent corner (default is
 *     ol.extent.Corner.BOTTOM_LEFT).
 * @return {!ol.tilegrid.TileGrid} TileGrid instance.
 */
ol.tilegrid.createForProjection = function(projection, opt_maxZoom, opt_tileSize, opt_corner) {
  var extent = ol.tilegrid.extentFromProjection(projection);
  return ol.tilegrid.createForExtent(
      extent, opt_maxZoom, opt_tileSize, opt_corner);
};


/**
 * Generate a tile grid extent from a projection.  If the projection has an
 * extent, it is used.  If not, a global extent is assumed.
 * @param {ol.ProjectionLike} projection Projection.
 * @return {ol.Extent} Extent.
 */
ol.tilegrid.extentFromProjection = function(projection) {
  projection = ol.proj.get(projection);
  var extent = projection.getExtent();
  if (!extent) {
    var half = 180 * ol.proj.METERS_PER_UNIT[ol.proj.Units.DEGREES] /
        projection.getMetersPerUnit();
    extent = ol.extent.createOrUpdate(-half, -half, half, half);
  }
  return extent;
};

goog.provide('ol.Attribution');

goog.require('ol.TileRange');
goog.require('ol.math');
goog.require('ol.tilegrid');


/**
 * @classdesc
 * An attribution for a layer source.
 *
 * Example:
 *
 *     source: new ol.source.OSM({
 *       attributions: [
 *         new ol.Attribution({
 *           html: 'All maps &copy; ' +
 *               '<a href="http://www.opencyclemap.org/">OpenCycleMap</a>'
 *         }),
 *         ol.source.OSM.ATTRIBUTION
 *       ],
 *     ..
 *
 * @constructor
 * @param {olx.AttributionOptions} options Attribution options.
 * @struct
 * @api stable
 */
ol.Attribution = function(options) {

  /**
   * @private
   * @type {string}
   */
  this.html_ = options.html;

  /**
   * @private
   * @type {Object.<string, Array.<ol.TileRange>>}
   */
  this.tileRanges_ = options.tileRanges ? options.tileRanges : null;

};


/**
 * Get the attribution markup.
 * @return {string} The attribution HTML.
 * @api stable
 */
ol.Attribution.prototype.getHTML = function() {
  return this.html_;
};


/**
 * @param {Object.<string, ol.TileRange>} tileRanges Tile ranges.
 * @param {!ol.tilegrid.TileGrid} tileGrid Tile grid.
 * @param {!ol.proj.Projection} projection Projection.
 * @return {boolean} Intersects any tile range.
 */
ol.Attribution.prototype.intersectsAnyTileRange = function(tileRanges, tileGrid, projection) {
  if (!this.tileRanges_) {
    return true;
  }
  var i, ii, tileRange, zKey;
  for (zKey in tileRanges) {
    if (!(zKey in this.tileRanges_)) {
      continue;
    }
    tileRange = tileRanges[zKey];
    var testTileRange;
    for (i = 0, ii = this.tileRanges_[zKey].length; i < ii; ++i) {
      testTileRange = this.tileRanges_[zKey][i];
      if (testTileRange.intersects(tileRange)) {
        return true;
      }
      var extentTileRange = tileGrid.getTileRangeForExtentAndZ(
          ol.tilegrid.extentFromProjection(projection), parseInt(zKey, 10));
      var width = extentTileRange.getWidth();
      if (tileRange.minX < extentTileRange.minX ||
          tileRange.maxX > extentTileRange.maxX) {
        if (testTileRange.intersects(new ol.TileRange(
            ol.math.modulo(tileRange.minX, width),
            ol.math.modulo(tileRange.maxX, width),
            tileRange.minY, tileRange.maxY))) {
          return true;
        }
        if (tileRange.getWidth() > width &&
            testTileRange.intersects(extentTileRange)) {
          return true;
        }
      }
    }
  }
  return false;
};

/**
 * An implementation of Google Maps' MVCArray.
 * @see https://developers.google.com/maps/documentation/javascript/reference
 */

goog.provide('ol.Collection');

goog.require('ol');
goog.require('ol.events.Event');
goog.require('ol.Object');


/**
 * @enum {string}
 */
ol.CollectionProperty = {
  LENGTH: 'length'
};


/**
 * @classdesc
 * An expanded version of standard JS Array, adding convenience methods for
 * manipulation. Add and remove changes to the Collection trigger a Collection
 * event. Note that this does not cover changes to the objects _within_ the
 * Collection; they trigger events on the appropriate object, not on the
 * Collection as a whole.
 *
 * @constructor
 * @extends {ol.Object}
 * @fires ol.Collection.Event
 * @param {!Array.<T>=} opt_array Array.
 * @template T
 * @api stable
 */
ol.Collection = function(opt_array) {

  ol.Object.call(this);

  /**
   * @private
   * @type {!Array.<T>}
   */
  this.array_ = opt_array ? opt_array : [];

  this.updateLength_();

};
ol.inherits(ol.Collection, ol.Object);


/**
 * Remove all elements from the collection.
 * @api stable
 */
ol.Collection.prototype.clear = function() {
  while (this.getLength() > 0) {
    this.pop();
  }
};


/**
 * Add elements to the collection.  This pushes each item in the provided array
 * to the end of the collection.
 * @param {!Array.<T>} arr Array.
 * @return {ol.Collection.<T>} This collection.
 * @api stable
 */
ol.Collection.prototype.extend = function(arr) {
  var i, ii;
  for (i = 0, ii = arr.length; i < ii; ++i) {
    this.push(arr[i]);
  }
  return this;
};


/**
 * Iterate over each element, calling the provided callback.
 * @param {function(this: S, T, number, Array.<T>): *} f The function to call
 *     for every element. This function takes 3 arguments (the element, the
 *     index and the array). The return value is ignored.
 * @param {S=} opt_this The object to use as `this` in `f`.
 * @template S
 * @api stable
 */
ol.Collection.prototype.forEach = function(f, opt_this) {
  this.array_.forEach(f, opt_this);
};


/**
 * Get a reference to the underlying Array object. Warning: if the array
 * is mutated, no events will be dispatched by the collection, and the
 * collection's "length" property won't be in sync with the actual length
 * of the array.
 * @return {!Array.<T>} Array.
 * @api stable
 */
ol.Collection.prototype.getArray = function() {
  return this.array_;
};


/**
 * Get the element at the provided index.
 * @param {number} index Index.
 * @return {T} Element.
 * @api stable
 */
ol.Collection.prototype.item = function(index) {
  return this.array_[index];
};


/**
 * Get the length of this collection.
 * @return {number} The length of the array.
 * @observable
 * @api stable
 */
ol.Collection.prototype.getLength = function() {
  return /** @type {number} */ (this.get(ol.CollectionProperty.LENGTH));
};


/**
 * Insert an element at the provided index.
 * @param {number} index Index.
 * @param {T} elem Element.
 * @api stable
 */
ol.Collection.prototype.insertAt = function(index, elem) {
  this.array_.splice(index, 0, elem);
  this.updateLength_();
  this.dispatchEvent(
      new ol.Collection.Event(ol.Collection.EventType.ADD, elem));
};


/**
 * Remove the last element of the collection and return it.
 * Return `undefined` if the collection is empty.
 * @return {T|undefined} Element.
 * @api stable
 */
ol.Collection.prototype.pop = function() {
  return this.removeAt(this.getLength() - 1);
};


/**
 * Insert the provided element at the end of the collection.
 * @param {T} elem Element.
 * @return {number} Length.
 * @api stable
 */
ol.Collection.prototype.push = function(elem) {
  var n = this.array_.length;
  this.insertAt(n, elem);
  return n;
};


/**
 * Remove the first occurrence of an element from the collection.
 * @param {T} elem Element.
 * @return {T|undefined} The removed element or undefined if none found.
 * @api stable
 */
ol.Collection.prototype.remove = function(elem) {
  var arr = this.array_;
  var i, ii;
  for (i = 0, ii = arr.length; i < ii; ++i) {
    if (arr[i] === elem) {
      return this.removeAt(i);
    }
  }
  return undefined;
};


/**
 * Remove the element at the provided index and return it.
 * Return `undefined` if the collection does not contain this index.
 * @param {number} index Index.
 * @return {T|undefined} Value.
 * @api stable
 */
ol.Collection.prototype.removeAt = function(index) {
  var prev = this.array_[index];
  this.array_.splice(index, 1);
  this.updateLength_();
  this.dispatchEvent(
      new ol.Collection.Event(ol.Collection.EventType.REMOVE, prev));
  return prev;
};


/**
 * Set the element at the provided index.
 * @param {number} index Index.
 * @param {T} elem Element.
 * @api stable
 */
ol.Collection.prototype.setAt = function(index, elem) {
  var n = this.getLength();
  if (index < n) {
    var prev = this.array_[index];
    this.array_[index] = elem;
    this.dispatchEvent(
        new ol.Collection.Event(ol.Collection.EventType.REMOVE, prev));
    this.dispatchEvent(
        new ol.Collection.Event(ol.Collection.EventType.ADD, elem));
  } else {
    var j;
    for (j = n; j < index; ++j) {
      this.insertAt(j, undefined);
    }
    this.insertAt(index, elem);
  }
};


/**
 * @private
 */
ol.Collection.prototype.updateLength_ = function() {
  this.set(ol.CollectionProperty.LENGTH, this.array_.length);
};


/**
 * @enum {string}
 */
ol.Collection.EventType = {
  /**
   * Triggered when an item is added to the collection.
   * @event ol.Collection.Event#add
   * @api stable
   */
  ADD: 'add',
  /**
   * Triggered when an item is removed from the collection.
   * @event ol.Collection.Event#remove
   * @api stable
   */
  REMOVE: 'remove'
};


/**
 * @classdesc
 * Events emitted by {@link ol.Collection} instances are instances of this
 * type.
 *
 * @constructor
 * @extends {ol.events.Event}
 * @implements {oli.Collection.Event}
 * @param {ol.Collection.EventType} type Type.
 * @param {*=} opt_element Element.
 */
ol.Collection.Event = function(type, opt_element) {

  ol.events.Event.call(this, type);

  /**
   * The element that is added to or removed from the collection.
   * @type {*}
   * @api stable
   */
  this.element = opt_element;

};
ol.inherits(ol.Collection.Event, ol.events.Event);

goog.provide('ol.color');

goog.require('ol');
goog.require('ol.asserts');
goog.require('ol.math');


/**
 * This RegExp matches # followed by 3 or 6 hex digits.
 * @const
 * @type {RegExp}
 * @private
 */
ol.color.hexColorRe_ = /^#(?:[0-9a-f]{3}){1,2}$/i;


/**
 * Regular expression for matching and capturing RGB style strings.
 * @const
 * @type {RegExp}
 * @private
 */
ol.color.rgbColorRe_ =
    /^(?:rgb)?\((0|[1-9]\d{0,2}),\s?(0|[1-9]\d{0,2}),\s?(0|[1-9]\d{0,2})\)$/i;


/**
 * Regular expression for matching and capturing RGBA style strings.
 * @const
 * @type {RegExp}
 * @private
 */
ol.color.rgbaColorRe_ =
    /^(?:rgba)?\((0|[1-9]\d{0,2}),\s?(0|[1-9]\d{0,2}),\s?(0|[1-9]\d{0,2}),\s?(0|1|0\.\d{0,10})\)$/i;


/**
 * Regular expression for matching potential named color style strings.
 * @const
 * @type {RegExp}
 * @private
 */
ol.color.namedColorRe_ =
    /^([a-z]*)$/i;


/**
 * Return the color as an array. This function maintains a cache of calculated
 * arrays which means the result should not be modified.
 * @param {ol.Color|string} color Color.
 * @return {ol.Color} Color.
 * @api
 */
ol.color.asArray = function(color) {
  if (Array.isArray(color)) {
    return color;
  } else {
    return ol.color.fromString(/** @type {string} */ (color));
  }
};


/**
 * Return the color as an rgba string.
 * @param {ol.Color|string} color Color.
 * @return {string} Rgba string.
 * @api
 */
ol.color.asString = function(color) {
  if (typeof color === 'string') {
    return color;
  } else {
    return ol.color.toString(color);
  }
};

/**
 * Return named color as an rgba string.
 * @param {string} color Named color.
 * @return {string} Rgb string.
 */
ol.color.fromNamed = function(color) {
  var el = document.createElement('div');
  el.style.color = color;
  document.body.appendChild(el);
  var rgb = window.getComputedStyle(el).color;
  document.body.removeChild(el);
  return rgb;
};


/**
 * @param {string} s String.
 * @return {ol.Color} Color.
 */
ol.color.fromString = (
    function() {

      // We maintain a small cache of parsed strings.  To provide cheap LRU-like
      // semantics, whenever the cache grows too large we simply delete an
      // arbitrary 25% of the entries.

      /**
       * @const
       * @type {number}
       */
      var MAX_CACHE_SIZE = 1024;

      /**
       * @type {Object.<string, ol.Color>}
       */
      var cache = {};

      /**
       * @type {number}
       */
      var cacheSize = 0;

      return (
          /**
           * @param {string} s String.
           * @return {ol.Color} Color.
           */
          function(s) {
            var color;
            if (cache.hasOwnProperty(s)) {
              color = cache[s];
            } else {
              if (cacheSize >= MAX_CACHE_SIZE) {
                var i = 0;
                var key;
                for (key in cache) {
                  if ((i++ & 3) === 0) {
                    delete cache[key];
                    --cacheSize;
                  }
                }
              }
              color = ol.color.fromStringInternal_(s);
              cache[s] = color;
              ++cacheSize;
            }
            return color;
          });

    })();


/**
 * @param {string} s String.
 * @private
 * @return {ol.Color} Color.
 */
ol.color.fromStringInternal_ = function(s) {
  var r, g, b, a, color, match;

  if (ol.color.namedColorRe_.exec(s)) {
    s = ol.color.fromNamed(s);
  }

  if (ol.color.hexColorRe_.exec(s)) { // hex
    var n = s.length - 1; // number of hex digits
    ol.asserts.assert(n == 3 || n == 6, 54); // Hex color should have 3 or 6 digits
    var d = n == 3 ? 1 : 2; // number of digits per channel
    r = parseInt(s.substr(1 + 0 * d, d), 16);
    g = parseInt(s.substr(1 + 1 * d, d), 16);
    b = parseInt(s.substr(1 + 2 * d, d), 16);
    if (d == 1) {
      r = (r << 4) + r;
      g = (g << 4) + g;
      b = (b << 4) + b;
    }
    a = 1;
    color = [r, g, b, a];
  } else if ((match = ol.color.rgbaColorRe_.exec(s))) { // rgba()
    r = Number(match[1]);
    g = Number(match[2]);
    b = Number(match[3]);
    a = Number(match[4]);
    color = ol.color.normalize([r, g, b, a]);
  } else if ((match = ol.color.rgbColorRe_.exec(s))) { // rgb()
    r = Number(match[1]);
    g = Number(match[2]);
    b = Number(match[3]);
    color = ol.color.normalize([r, g, b, 1]);
  } else {
    ol.asserts.assert(false, 14); // Invalid color
  }
  return /** @type {ol.Color} */ (color);
};


/**
 * @param {ol.Color} color Color.
 * @return {boolean} Is valid.
 */
ol.color.isValid = function(color) {
  return 0 <= color[0] && color[0] < 256 &&
      0 <= color[1] && color[1] < 256 &&
      0 <= color[2] && color[2] < 256 &&
      0 <= color[3] && color[3] <= 1;
};


/**
 * @param {ol.Color} color Color.
 * @param {ol.Color=} opt_color Color.
 * @return {ol.Color} Clamped color.
 */
ol.color.normalize = function(color, opt_color) {
  var result = opt_color || [];
  result[0] = ol.math.clamp((color[0] + 0.5) | 0, 0, 255);
  result[1] = ol.math.clamp((color[1] + 0.5) | 0, 0, 255);
  result[2] = ol.math.clamp((color[2] + 0.5) | 0, 0, 255);
  result[3] = ol.math.clamp(color[3], 0, 1);
  return result;
};


/**
 * @param {ol.Color} color Color.
 * @return {string} String.
 */
ol.color.toString = function(color) {
  var r = color[0];
  if (r != (r | 0)) {
    r = (r + 0.5) | 0;
  }
  var g = color[1];
  if (g != (g | 0)) {
    g = (g + 0.5) | 0;
  }
  var b = color[2];
  if (b != (b | 0)) {
    b = (b + 0.5) | 0;
  }
  var a = color[3] === undefined ? 1 : color[3];
  return 'rgba(' + r + ',' + g + ',' + b + ',' + a + ')';
};

goog.provide('ol.colorlike');

goog.require('ol.color');


/**
 * @param {ol.Color|ol.ColorLike} color Color.
 * @return {ol.ColorLike} The color as an ol.ColorLike
 * @api
 */
ol.colorlike.asColorLike = function(color) {
  if (ol.colorlike.isColorLike(color)) {
    return /** @type {string|CanvasPattern|CanvasGradient} */ (color);
  } else {
    return ol.color.asString(/** @type {ol.Color} */ (color));
  }
};


/**
 * @param {?} color The value that is potentially an ol.ColorLike
 * @return {boolean} Whether the color is an ol.ColorLike
 */
ol.colorlike.isColorLike = function(color) {
  return (
      typeof color === 'string' ||
      color instanceof CanvasPattern ||
      color instanceof CanvasGradient
  );
};

// Copyright 2009 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/**
 * @fileoverview Provides a base class for custom Error objects such that the
 * stack is correctly maintained.
 *
 * You should never need to throw goog.debug.Error(msg) directly, Error(msg) is
 * sufficient.
 *
 */

goog.provide('goog.debug.Error');



/**
 * Base class for custom error objects.
 * @param {*=} opt_msg The message associated with the error.
 * @constructor
 * @extends {Error}
 */
goog.debug.Error = function(opt_msg) {

  // Attempt to ensure there is a stack trace.
  if (Error.captureStackTrace) {
    Error.captureStackTrace(this, goog.debug.Error);
  } else {
    var stack = new Error().stack;
    if (stack) {
      this.stack = stack;
    }
  }

  if (opt_msg) {
    this.message = String(opt_msg);
  }

  /**
   * Whether to report this error to the server. Setting this to false will
   * cause the error reporter to not report the error back to the server,
   * which can be useful if the client knows that the error has already been
   * logged on the server.
   * @type {boolean}
   */
  this.reportErrorToServer = true;
};
goog.inherits(goog.debug.Error, Error);


/** @override */
goog.debug.Error.prototype.name = 'CustomError';

// Copyright 2006 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/**
 * @fileoverview Definition of goog.dom.NodeType.
 */

goog.provide('goog.dom.NodeType');


/**
 * Constants for the nodeType attribute in the Node interface.
 *
 * These constants match those specified in the Node interface. These are
 * usually present on the Node object in recent browsers, but not in older
 * browsers (specifically, early IEs) and thus are given here.
 *
 * In some browsers (early IEs), these are not defined on the Node object,
 * so they are provided here.
 *
 * See http://www.w3.org/TR/DOM-Level-2-Core/core.html#ID-1950641247
 * @enum {number}
 */
goog.dom.NodeType = {
  ELEMENT: 1,
  ATTRIBUTE: 2,
  TEXT: 3,
  CDATA_SECTION: 4,
  ENTITY_REFERENCE: 5,
  ENTITY: 6,
  PROCESSING_INSTRUCTION: 7,
  COMMENT: 8,
  DOCUMENT: 9,
  DOCUMENT_TYPE: 10,
  DOCUMENT_FRAGMENT: 11,
  NOTATION: 12
};

// Copyright 2006 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/**
 * @fileoverview Utilities for string manipulation.
 * @author arv@google.com (Erik Arvidsson)
 */


/**
 * Namespace for string utilities
 */
goog.provide('goog.string');
goog.provide('goog.string.Unicode');


/**
 * @define {boolean} Enables HTML escaping of lowercase letter "e" which helps
 * with detection of double-escaping as this letter is frequently used.
 */
goog.define('goog.string.DETECT_DOUBLE_ESCAPING', false);


/**
 * @define {boolean} Whether to force non-dom html unescaping.
 */
goog.define('goog.string.FORCE_NON_DOM_HTML_UNESCAPING', false);


/**
 * Common Unicode string characters.
 * @enum {string}
 */
goog.string.Unicode = {
  NBSP: '\xa0'
};


/**
 * Fast prefix-checker.
 * @param {string} str The string to check.
 * @param {string} prefix A string to look for at the start of {@code str}.
 * @return {boolean} True if {@code str} begins with {@code prefix}.
 */
goog.string.startsWith = function(str, prefix) {
  return str.lastIndexOf(prefix, 0) == 0;
};


/**
 * Fast suffix-checker.
 * @param {string} str The string to check.
 * @param {string} suffix A string to look for at the end of {@code str}.
 * @return {boolean} True if {@code str} ends with {@code suffix}.
 */
goog.string.endsWith = function(str, suffix) {
  var l = str.length - suffix.length;
  return l >= 0 && str.indexOf(suffix, l) == l;
};


/**
 * Case-insensitive prefix-checker.
 * @param {string} str The string to check.
 * @param {string} prefix  A string to look for at the end of {@code str}.
 * @return {boolean} True if {@code str} begins with {@code prefix} (ignoring
 *     case).
 */
goog.string.caseInsensitiveStartsWith = function(str, prefix) {
  return goog.string.caseInsensitiveCompare(
             prefix, str.substr(0, prefix.length)) == 0;
};


/**
 * Case-insensitive suffix-checker.
 * @param {string} str The string to check.
 * @param {string} suffix A string to look for at the end of {@code str}.
 * @return {boolean} True if {@code str} ends with {@code suffix} (ignoring
 *     case).
 */
goog.string.caseInsensitiveEndsWith = function(str, suffix) {
  return goog.string.caseInsensitiveCompare(
             suffix, str.substr(str.length - suffix.length, suffix.length)) ==
      0;
};


/**
 * Case-insensitive equality checker.
 * @param {string} str1 First string to check.
 * @param {string} str2 Second string to check.
 * @return {boolean} True if {@code str1} and {@code str2} are the same string,
 *     ignoring case.
 */
goog.string.caseInsensitiveEquals = function(str1, str2) {
  return str1.toLowerCase() == str2.toLowerCase();
};


/**
 * Does simple python-style string substitution.
 * subs("foo%s hot%s", "bar", "dog") becomes "foobar hotdog".
 * @param {string} str The string containing the pattern.
 * @param {...*} var_args The items to substitute into the pattern.
 * @return {string} A copy of {@code str} in which each occurrence of
 *     {@code %s} has been replaced an argument from {@code var_args}.
 */
goog.string.subs = function(str, var_args) {
  var splitParts = str.split('%s');
  var returnString = '';

  var subsArguments = Array.prototype.slice.call(arguments, 1);
  while (subsArguments.length &&
         // Replace up to the last split part. We are inserting in the
         // positions between split parts.
         splitParts.length > 1) {
    returnString += splitParts.shift() + subsArguments.shift();
  }

  return returnString + splitParts.join('%s');  // Join unused '%s'
};


/**
 * Converts multiple whitespace chars (spaces, non-breaking-spaces, new lines
 * and tabs) to a single space, and strips leading and trailing whitespace.
 * @param {string} str Input string.
 * @return {string} A copy of {@code str} with collapsed whitespace.
 */
goog.string.collapseWhitespace = function(str) {
  // Since IE doesn't include non-breaking-space (0xa0) in their \s character
  // class (as required by section 7.2 of the ECMAScript spec), we explicitly
  // include it in the regexp to enforce consistent cross-browser behavior.
  return str.replace(/[\s\xa0]+/g, ' ').replace(/^\s+|\s+$/g, '');
};


/**
 * Checks if a string is empty or contains only whitespaces.
 * @param {string} str The string to check.
 * @return {boolean} Whether {@code str} is empty or whitespace only.
 */
goog.string.isEmptyOrWhitespace = function(str) {
  // testing length == 0 first is actually slower in all browsers (about the
  // same in Opera).
  // Since IE doesn't include non-breaking-space (0xa0) in their \s character
  // class (as required by section 7.2 of the ECMAScript spec), we explicitly
  // include it in the regexp to enforce consistent cross-browser behavior.
  return /^[\s\xa0]*$/.test(str);
};


/**
 * Checks if a string is empty.
 * @param {string} str The string to check.
 * @return {boolean} Whether {@code str} is empty.
 */
goog.string.isEmptyString = function(str) {
  return str.length == 0;
};


/**
 * Checks if a string is empty or contains only whitespaces.
 *
 * TODO(user): Deprecate this when clients have been switched over to
 * goog.string.isEmptyOrWhitespace.
 *
 * @param {string} str The string to check.
 * @return {boolean} Whether {@code str} is empty or whitespace only.
 */
goog.string.isEmpty = goog.string.isEmptyOrWhitespace;


/**
 * Checks if a string is null, undefined, empty or contains only whitespaces.
 * @param {*} str The string to check.
 * @return {boolean} Whether {@code str} is null, undefined, empty, or
 *     whitespace only.
 * @deprecated Use goog.string.isEmptyOrWhitespace(goog.string.makeSafe(str))
 *     instead.
 */
goog.string.isEmptyOrWhitespaceSafe = function(str) {
  return goog.string.isEmptyOrWhitespace(goog.string.makeSafe(str));
};


/**
 * Checks if a string is null, undefined, empty or contains only whitespaces.
 *
 * TODO(user): Deprecate this when clients have been switched over to
 * goog.string.isEmptyOrWhitespaceSafe.
 *
 * @param {*} str The string to check.
 * @return {boolean} Whether {@code str} is null, undefined, empty, or
 *     whitespace only.
 */
goog.string.isEmptySafe = goog.string.isEmptyOrWhitespaceSafe;


/**
 * Checks if a string is all breaking whitespace.
 * @param {string} str The string to check.
 * @return {boolean} Whether the string is all breaking whitespace.
 */
goog.string.isBreakingWhitespace = function(str) {
  return !/[^\t\n\r ]/.test(str);
};


/**
 * Checks if a string contains all letters.
 * @param {string} str string to check.
 * @return {boolean} True if {@code str} consists entirely of letters.
 */
goog.string.isAlpha = function(str) {
  return !/[^a-zA-Z]/.test(str);
};


/**
 * Checks if a string contains only numbers.
 * @param {*} str string to check. If not a string, it will be
 *     casted to one.
 * @return {boolean} True if {@code str} is numeric.
 */
goog.string.isNumeric = function(str) {
  return !/[^0-9]/.test(str);
};


/**
 * Checks if a string contains only numbers or letters.
 * @param {string} str string to check.
 * @return {boolean} True if {@code str} is alphanumeric.
 */
goog.string.isAlphaNumeric = function(str) {
  return !/[^a-zA-Z0-9]/.test(str);
};


/**
 * Checks if a character is a space character.
 * @param {string} ch Character to check.
 * @return {boolean} True if {@code ch} is a space.
 */
goog.string.isSpace = function(ch) {
  return ch == ' ';
};


/**
 * Checks if a character is a valid unicode character.
 * @param {string} ch Character to check.
 * @return {boolean} True if {@code ch} is a valid unicode character.
 */
goog.string.isUnicodeChar = function(ch) {
  return ch.length == 1 && ch >= ' ' && ch <= '~' ||
      ch >= '\u0080' && ch <= '\uFFFD';
};


/**
 * Takes a string and replaces newlines with a space. Multiple lines are
 * replaced with a single space.
 * @param {string} str The string from which to strip newlines.
 * @return {string} A copy of {@code str} stripped of newlines.
 */
goog.string.stripNewlines = function(str) {
  return str.replace(/(\r\n|\r|\n)+/g, ' ');
};


/**
 * Replaces Windows and Mac new lines with unix style: \r or \r\n with \n.
 * @param {string} str The string to in which to canonicalize newlines.
 * @return {string} {@code str} A copy of {@code} with canonicalized newlines.
 */
goog.string.canonicalizeNewlines = function(str) {
  return str.replace(/(\r\n|\r|\n)/g, '\n');
};


/**
 * Normalizes whitespace in a string, replacing all whitespace chars with
 * a space.
 * @param {string} str The string in which to normalize whitespace.
 * @return {string} A copy of {@code str} with all whitespace normalized.
 */
goog.string.normalizeWhitespace = function(str) {
  return str.replace(/\xa0|\s/g, ' ');
};


/**
 * Normalizes spaces in a string, replacing all consecutive spaces and tabs
 * with a single space. Replaces non-breaking space with a space.
 * @param {string} str The string in which to normalize spaces.
 * @return {string} A copy of {@code str} with all consecutive spaces and tabs
 *    replaced with a single space.
 */
goog.string.normalizeSpaces = function(str) {
  return str.replace(/\xa0|[ \t]+/g, ' ');
};


/**
 * Removes the breaking spaces from the left and right of the string and
 * collapses the sequences of breaking spaces in the middle into single spaces.
 * The original and the result strings render the same way in HTML.
 * @param {string} str A string in which to collapse spaces.
 * @return {string} Copy of the string with normalized breaking spaces.
 */
goog.string.collapseBreakingSpaces = function(str) {
  return str.replace(/[\t\r\n ]+/g, ' ')
      .replace(/^[\t\r\n ]+|[\t\r\n ]+$/g, '');
};


/**
 * Trims white spaces to the left and right of a string.
 * @param {string} str The string to trim.
 * @return {string} A trimmed copy of {@code str}.
 */
goog.string.trim =
    (goog.TRUSTED_SITE && String.prototype.trim) ? function(str) {
      return str.trim();
    } : function(str) {
      // Since IE doesn't include non-breaking-space (0xa0) in their \s
      // character class (as required by section 7.2 of the ECMAScript spec),
      // we explicitly include it in the regexp to enforce consistent
      // cross-browser behavior.
      return str.replace(/^[\s\xa0]+|[\s\xa0]+$/g, '');
    };


/**
 * Trims whitespaces at the left end of a string.
 * @param {string} str The string to left trim.
 * @return {string} A trimmed copy of {@code str}.
 */
goog.string.trimLeft = function(str) {
  // Since IE doesn't include non-breaking-space (0xa0) in their \s character
  // class (as required by section 7.2 of the ECMAScript spec), we explicitly
  // include it in the regexp to enforce consistent cross-browser behavior.
  return str.replace(/^[\s\xa0]+/, '');
};


/**
 * Trims whitespaces at the right end of a string.
 * @param {string} str The string to right trim.
 * @return {string} A trimmed copy of {@code str}.
 */
goog.string.trimRight = function(str) {
  // Since IE doesn't include non-breaking-space (0xa0) in their \s character
  // class (as required by section 7.2 of the ECMAScript spec), we explicitly
  // include it in the regexp to enforce consistent cross-browser behavior.
  return str.replace(/[\s\xa0]+$/, '');
};


/**
 * A string comparator that ignores case.
 * -1 = str1 less than str2
 *  0 = str1 equals str2
 *  1 = str1 greater than str2
 *
 * @param {string} str1 The string to compare.
 * @param {string} str2 The string to compare {@code str1} to.
 * @return {number} The comparator result, as described above.
 */
goog.string.caseInsensitiveCompare = function(str1, str2) {
  var test1 = String(str1).toLowerCase();
  var test2 = String(str2).toLowerCase();

  if (test1 < test2) {
    return -1;
  } else if (test1 == test2) {
    return 0;
  } else {
    return 1;
  }
};


/**
 * Compares two strings interpreting their numeric substrings as numbers.
 *
 * @param {string} str1 First string.
 * @param {string} str2 Second string.
 * @param {!RegExp} tokenizerRegExp Splits a string into substrings of
 *     non-negative integers, non-numeric characters and optionally fractional
 *     numbers starting with a decimal point.
 * @return {number} Negative if str1 < str2, 0 is str1 == str2, positive if
 *     str1 > str2.
 * @private
 */
goog.string.numberAwareCompare_ = function(str1, str2, tokenizerRegExp) {
  if (str1 == str2) {
    return 0;
  }
  if (!str1) {
    return -1;
  }
  if (!str2) {
    return 1;
  }

  // Using match to split the entire string ahead of time turns out to be faster
  // for most inputs than using RegExp.exec or iterating over each character.
  var tokens1 = str1.toLowerCase().match(tokenizerRegExp);
  var tokens2 = str2.toLowerCase().match(tokenizerRegExp);

  var count = Math.min(tokens1.length, tokens2.length);

  for (var i = 0; i < count; i++) {
    var a = tokens1[i];
    var b = tokens2[i];

    // Compare pairs of tokens, returning if one token sorts before the other.
    if (a != b) {
      // Only if both tokens are integers is a special comparison required.
      // Decimal numbers are sorted as strings (e.g., '.09' < '.1').
      var num1 = parseInt(a, 10);
      if (!isNaN(num1)) {
        var num2 = parseInt(b, 10);
        if (!isNaN(num2) && num1 - num2) {
          return num1 - num2;
        }
      }
      return a < b ? -1 : 1;
    }
  }

  // If one string is a substring of the other, the shorter string sorts first.
  if (tokens1.length != tokens2.length) {
    return tokens1.length - tokens2.length;
  }

  // The two strings must be equivalent except for case (perfect equality is
  // tested at the head of the function.) Revert to default ASCII string
  // comparison to stabilize the sort.
  return str1 < str2 ? -1 : 1;
};


/**
 * String comparison function that handles non-negative integer numbers in a
 * way humans might expect. Using this function, the string 'File 2.jpg' sorts
 * before 'File 10.jpg', and 'Version 1.9' before 'Version 1.10'. The comparison
 * is mostly case-insensitive, though strings that are identical except for case
 * are sorted with the upper-case strings before lower-case.
 *
 * This comparison function is up to 50x slower than either the default or the
 * case-insensitive compare. It should not be used in time-critical code, but
 * should be fast enough to sort several hundred short strings (like filenames)
 * with a reasonable delay.
 *
 * @param {string} str1 The string to compare in a numerically sensitive way.
 * @param {string} str2 The string to compare {@code str1} to.
 * @return {number} less than 0 if str1 < str2, 0 if str1 == str2, greater than
 *     0 if str1 > str2.
 */
goog.string.intAwareCompare = function(str1, str2) {
  return goog.string.numberAwareCompare_(str1, str2, /\d+|\D+/g);
};


/**
 * String comparison function that handles non-negative integer and fractional
 * numbers in a way humans might expect. Using this function, the string
 * 'File 2.jpg' sorts before 'File 10.jpg', and '3.14' before '3.2'. Equivalent
 * to {@link goog.string.intAwareCompare} apart from the way how it interprets
 * dots.
 *
 * @param {string} str1 The string to compare in a numerically sensitive way.
 * @param {string} str2 The string to compare {@code str1} to.
 * @return {number} less than 0 if str1 < str2, 0 if str1 == str2, greater than
 *     0 if str1 > str2.
 */
goog.string.floatAwareCompare = function(str1, str2) {
  return goog.string.numberAwareCompare_(str1, str2, /\d+|\.\d+|\D+/g);
};


/**
 * Alias for {@link goog.string.floatAwareCompare}.
 *
 * @param {string} str1
 * @param {string} str2
 * @return {number}
 */
goog.string.numerateCompare = goog.string.floatAwareCompare;


/**
 * URL-encodes a string
 * @param {*} str The string to url-encode.
 * @return {string} An encoded copy of {@code str} that is safe for urls.
 *     Note that '#', ':', and other characters used to delimit portions
 *     of URLs *will* be encoded.
 */
goog.string.urlEncode = function(str) {
  return encodeURIComponent(String(str));
};


/**
 * URL-decodes the string. We need to specially handle '+'s because
 * the javascript library doesn't convert them to spaces.
 * @param {string} str The string to url decode.
 * @return {string} The decoded {@code str}.
 */
goog.string.urlDecode = function(str) {
  return decodeURIComponent(str.replace(/\+/g, ' '));
};


/**
 * Converts \n to <br>s or <br />s.
 * @param {string} str The string in which to convert newlines.
 * @param {boolean=} opt_xml Whether to use XML compatible tags.
 * @return {string} A copy of {@code str} with converted newlines.
 */
goog.string.newLineToBr = function(str, opt_xml) {
  return str.replace(/(\r\n|\r|\n)/g, opt_xml ? '<br />' : '<br>');
};


/**
 * Escapes double quote '"' and single quote '\'' characters in addition to
 * '&', '<', and '>' so that a string can be included in an HTML tag attribute
 * value within double or single quotes.
 *
 * It should be noted that > doesn't need to be escaped for the HTML or XML to
 * be valid, but it has been decided to escape it for consistency with other
 * implementations.
 *
 * With goog.string.DETECT_DOUBLE_ESCAPING, this function escapes also the
 * lowercase letter "e".
 *
 * NOTE(user):
 * HtmlEscape is often called during the generation of large blocks of HTML.
 * Using statics for the regular expressions and strings is an optimization
 * that can more than half the amount of time IE spends in this function for
 * large apps, since strings and regexes both contribute to GC allocations.
 *
 * Testing for the presence of a character before escaping increases the number
 * of function calls, but actually provides a speed increase for the average
 * case -- since the average case often doesn't require the escaping of all 4
 * characters and indexOf() is much cheaper than replace().
 * The worst case does suffer slightly from the additional calls, therefore the
 * opt_isLikelyToContainHtmlChars option has been included for situations
 * where all 4 HTML entities are very likely to be present and need escaping.
 *
 * Some benchmarks (times tended to fluctuate +-0.05ms):
 *                                     FireFox                     IE6
 * (no chars / average (mix of cases) / all 4 chars)
 * no checks                     0.13 / 0.22 / 0.22         0.23 / 0.53 / 0.80
 * indexOf                       0.08 / 0.17 / 0.26         0.22 / 0.54 / 0.84
 * indexOf + re test             0.07 / 0.17 / 0.28         0.19 / 0.50 / 0.85
 *
 * An additional advantage of checking if replace actually needs to be called
 * is a reduction in the number of object allocations, so as the size of the
 * application grows the difference between the various methods would increase.
 *
 * @param {string} str string to be escaped.
 * @param {boolean=} opt_isLikelyToContainHtmlChars Don't perform a check to see
 *     if the character needs replacing - use this option if you expect each of
 *     the characters to appear often. Leave false if you expect few html
 *     characters to occur in your strings, such as if you are escaping HTML.
 * @return {string} An escaped copy of {@code str}.
 */
goog.string.htmlEscape = function(str, opt_isLikelyToContainHtmlChars) {

  if (opt_isLikelyToContainHtmlChars) {
    str = str.replace(goog.string.AMP_RE_, '&amp;')
              .replace(goog.string.LT_RE_, '&lt;')
              .replace(goog.string.GT_RE_, '&gt;')
              .replace(goog.string.QUOT_RE_, '&quot;')
              .replace(goog.string.SINGLE_QUOTE_RE_, '&#39;')
              .replace(goog.string.NULL_RE_, '&#0;');
    if (goog.string.DETECT_DOUBLE_ESCAPING) {
      str = str.replace(goog.string.E_RE_, '&#101;');
    }
    return str;

  } else {
    // quick test helps in the case when there are no chars to replace, in
    // worst case this makes barely a difference to the time taken
    if (!goog.string.ALL_RE_.test(str)) return str;

    // str.indexOf is faster than regex.test in this case
    if (str.indexOf('&') != -1) {
      str = str.replace(goog.string.AMP_RE_, '&amp;');
    }
    if (str.indexOf('<') != -1) {
      str = str.replace(goog.string.LT_RE_, '&lt;');
    }
    if (str.indexOf('>') != -1) {
      str = str.replace(goog.string.GT_RE_, '&gt;');
    }
    if (str.indexOf('"') != -1) {
      str = str.replace(goog.string.QUOT_RE_, '&quot;');
    }
    if (str.indexOf('\'') != -1) {
      str = str.replace(goog.string.SINGLE_QUOTE_RE_, '&#39;');
    }
    if (str.indexOf('\x00') != -1) {
      str = str.replace(goog.string.NULL_RE_, '&#0;');
    }
    if (goog.string.DETECT_DOUBLE_ESCAPING && str.indexOf('e') != -1) {
      str = str.replace(goog.string.E_RE_, '&#101;');
    }
    return str;
  }
};


/**
 * Regular expression that matches an ampersand, for use in escaping.
 * @const {!RegExp}
 * @private
 */
goog.string.AMP_RE_ = /&/g;


/**
 * Regular expression that matches a less than sign, for use in escaping.
 * @const {!RegExp}
 * @private
 */
goog.string.LT_RE_ = /</g;


/**
 * Regular expression that matches a greater than sign, for use in escaping.
 * @const {!RegExp}
 * @private
 */
goog.string.GT_RE_ = />/g;


/**
 * Regular expression that matches a double quote, for use in escaping.
 * @const {!RegExp}
 * @private
 */
goog.string.QUOT_RE_ = /"/g;


/**
 * Regular expression that matches a single quote, for use in escaping.
 * @const {!RegExp}
 * @private
 */
goog.string.SINGLE_QUOTE_RE_ = /'/g;


/**
 * Regular expression that matches null character, for use in escaping.
 * @const {!RegExp}
 * @private
 */
goog.string.NULL_RE_ = /\x00/g;


/**
 * Regular expression that matches a lowercase letter "e", for use in escaping.
 * @const {!RegExp}
 * @private
 */
goog.string.E_RE_ = /e/g;


/**
 * Regular expression that matches any character that needs to be escaped.
 * @const {!RegExp}
 * @private
 */
goog.string.ALL_RE_ =
    (goog.string.DETECT_DOUBLE_ESCAPING ? /[\x00&<>"'e]/ : /[\x00&<>"']/);


/**
 * Unescapes an HTML string.
 *
 * @param {string} str The string to unescape.
 * @return {string} An unescaped copy of {@code str}.
 */
goog.string.unescapeEntities = function(str) {
  if (goog.string.contains(str, '&')) {
    // We are careful not to use a DOM if we do not have one or we explicitly
    // requested non-DOM html unescaping.
    if (!goog.string.FORCE_NON_DOM_HTML_UNESCAPING &&
        'document' in goog.global) {
      return goog.string.unescapeEntitiesUsingDom_(str);
    } else {
      // Fall back on pure XML entities
      return goog.string.unescapePureXmlEntities_(str);
    }
  }
  return str;
};


/**
 * Unescapes a HTML string using the provided document.
 *
 * @param {string} str The string to unescape.
 * @param {!Document} document A document to use in escaping the string.
 * @return {string} An unescaped copy of {@code str}.
 */
goog.string.unescapeEntitiesWithDocument = function(str, document) {
  if (goog.string.contains(str, '&')) {
    return goog.string.unescapeEntitiesUsingDom_(str, document);
  }
  return str;
};


/**
 * Unescapes an HTML string using a DOM to resolve non-XML, non-numeric
 * entities. This function is XSS-safe and whitespace-preserving.
 * @private
 * @param {string} str The string to unescape.
 * @param {Document=} opt_document An optional document to use for creating
 *     elements. If this is not specified then the default window.document
 *     will be used.
 * @return {string} The unescaped {@code str} string.
 */
goog.string.unescapeEntitiesUsingDom_ = function(str, opt_document) {
  /** @type {!Object<string, string>} */
  var seen = {'&amp;': '&', '&lt;': '<', '&gt;': '>', '&quot;': '"'};
  var div;
  if (opt_document) {
    div = opt_document.createElement('div');
  } else {
    div = goog.global.document.createElement('div');
  }
  // Match as many valid entity characters as possible. If the actual entity
  // happens to be shorter, it will still work as innerHTML will return the
  // trailing characters unchanged. Since the entity characters do not include
  // open angle bracket, there is no chance of XSS from the innerHTML use.
  // Since no whitespace is passed to innerHTML, whitespace is preserved.
  return str.replace(goog.string.HTML_ENTITY_PATTERN_, function(s, entity) {
    // Check for cached entity.
    var value = seen[s];
    if (value) {
      return value;
    }
    // Check for numeric entity.
    if (entity.charAt(0) == '#') {
      // Prefix with 0 so that hex entities (e.g. &#x10) parse as hex numbers.
      var n = Number('0' + entity.substr(1));
      if (!isNaN(n)) {
        value = String.fromCharCode(n);
      }
    }
    // Fall back to innerHTML otherwise.
    if (!value) {
      // Append a non-entity character to avoid a bug in Webkit that parses
      // an invalid entity at the end of innerHTML text as the empty string.
      div.innerHTML = s + ' ';
      // Then remove the trailing character from the result.
      value = div.firstChild.nodeValue.slice(0, -1);
    }
    // Cache and return.
    return seen[s] = value;
  });
};


/**
 * Unescapes XML entities.
 * @private
 * @param {string} str The string to unescape.
 * @return {string} An unescaped copy of {@code str}.
 */
goog.string.unescapePureXmlEntities_ = function(str) {
  return str.replace(/&([^;]+);/g, function(s, entity) {
    switch (entity) {
      case 'amp':
        return '&';
      case 'lt':
        return '<';
      case 'gt':
        return '>';
      case 'quot':
        return '"';
      default:
        if (entity.charAt(0) == '#') {
          // Prefix with 0 so that hex entities (e.g. &#x10) parse as hex.
          var n = Number('0' + entity.substr(1));
          if (!isNaN(n)) {
            return String.fromCharCode(n);
          }
        }
        // For invalid entities we just return the entity
        return s;
    }
  });
};


/**
 * Regular expression that matches an HTML entity.
 * See also HTML5: Tokenization / Tokenizing character references.
 * @private
 * @type {!RegExp}
 */
goog.string.HTML_ENTITY_PATTERN_ = /&([^;\s<&]+);?/g;


/**
 * Do escaping of whitespace to preserve spatial formatting. We use character
 * entity #160 to make it safer for xml.
 * @param {string} str The string in which to escape whitespace.
 * @param {boolean=} opt_xml Whether to use XML compatible tags.
 * @return {string} An escaped copy of {@code str}.
 */
goog.string.whitespaceEscape = function(str, opt_xml) {
  // This doesn't use goog.string.preserveSpaces for backwards compatibility.
  return goog.string.newLineToBr(str.replace(/  /g, ' &#160;'), opt_xml);
};


/**
 * Preserve spaces that would be otherwise collapsed in HTML by replacing them
 * with non-breaking space Unicode characters.
 * @param {string} str The string in which to preserve whitespace.
 * @return {string} A copy of {@code str} with preserved whitespace.
 */
goog.string.preserveSpaces = function(str) {
  return str.replace(/(^|[\n ]) /g, '$1' + goog.string.Unicode.NBSP);
};


/**
 * Strip quote characters around a string.  The second argument is a string of
 * characters to treat as quotes.  This can be a single character or a string of
 * multiple character and in that case each of those are treated as possible
 * quote characters. For example:
 *
 * <pre>
 * goog.string.stripQuotes('"abc"', '"`') --> 'abc'
 * goog.string.stripQuotes('`abc`', '"`') --> 'abc'
 * </pre>
 *
 * @param {string} str The string to strip.
 * @param {string} quoteChars The quote characters to strip.
 * @return {string} A copy of {@code str} without the quotes.
 */
goog.string.stripQuotes = function(str, quoteChars) {
  var length = quoteChars.length;
  for (var i = 0; i < length; i++) {
    var quoteChar = length == 1 ? quoteChars : quoteChars.charAt(i);
    if (str.charAt(0) == quoteChar && str.charAt(str.length - 1) == quoteChar) {
      return str.substring(1, str.length - 1);
    }
  }
  return str;
};


/**
 * Truncates a string to a certain length and adds '...' if necessary.  The
 * length also accounts for the ellipsis, so a maximum length of 10 and a string
 * 'Hello World!' produces 'Hello W...'.
 * @param {string} str The string to truncate.
 * @param {number} chars Max number of characters.
 * @param {boolean=} opt_protectEscapedCharacters Whether to protect escaped
 *     characters from being cut off in the middle.
 * @return {string} The truncated {@code str} string.
 */
goog.string.truncate = function(str, chars, opt_protectEscapedCharacters) {
  if (opt_protectEscapedCharacters) {
    str = goog.string.unescapeEntities(str);
  }

  if (str.length > chars) {
    str = str.substring(0, chars - 3) + '...';
  }

  if (opt_protectEscapedCharacters) {
    str = goog.string.htmlEscape(str);
  }

  return str;
};


/**
 * Truncate a string in the middle, adding "..." if necessary,
 * and favoring the beginning of the string.
 * @param {string} str The string to truncate the middle of.
 * @param {number} chars Max number of characters.
 * @param {boolean=} opt_protectEscapedCharacters Whether to protect escaped
 *     characters from being cutoff in the middle.
 * @param {number=} opt_trailingChars Optional number of trailing characters to
 *     leave at the end of the string, instead of truncating as close to the
 *     middle as possible.
 * @return {string} A truncated copy of {@code str}.
 */
goog.string.truncateMiddle = function(
    str, chars, opt_protectEscapedCharacters, opt_trailingChars) {
  if (opt_protectEscapedCharacters) {
    str = goog.string.unescapeEntities(str);
  }

  if (opt_trailingChars && str.length > chars) {
    if (opt_trailingChars > chars) {
      opt_trailingChars = chars;
    }
    var endPoint = str.length - opt_trailingChars;
    var startPoint = chars - opt_trailingChars;
    str = str.substring(0, startPoint) + '...' + str.substring(endPoint);
  } else if (str.length > chars) {
    // Favor the beginning of the string:
    var half = Math.floor(chars / 2);
    var endPos = str.length - half;
    half += chars % 2;
    str = str.substring(0, half) + '...' + str.substring(endPos);
  }

  if (opt_protectEscapedCharacters) {
    str = goog.string.htmlEscape(str);
  }

  return str;
};


/**
 * Special chars that need to be escaped for goog.string.quote.
 * @private {!Object<string, string>}
 */
goog.string.specialEscapeChars_ = {
  '\0': '\\0',
  '\b': '\\b',
  '\f': '\\f',
  '\n': '\\n',
  '\r': '\\r',
  '\t': '\\t',
  '\x0B': '\\x0B',  // '\v' is not supported in JScript
  '"': '\\"',
  '\\': '\\\\',
  // To support the use case of embedding quoted strings inside of script
  // tags, we have to make sure HTML comments and opening/closing script tags do
  // not appear in the resulting string. The specific strings that must be
  // escaped are documented at:
  // http://www.w3.org/TR/html51/semantics.html#restrictions-for-contents-of-script-elements
  '<': '\x3c'
};


/**
 * Character mappings used internally for goog.string.escapeChar.
 * @private {!Object<string, string>}
 */
goog.string.jsEscapeCache_ = {
  '\'': '\\\''
};


/**
 * Encloses a string in double quotes and escapes characters so that the
 * string is a valid JS string. The resulting string is safe to embed in
 * `<script>` tags as "<" is escaped.
 * @param {string} s The string to quote.
 * @return {string} A copy of {@code s} surrounded by double quotes.
 */
goog.string.quote = function(s) {
  s = String(s);
  var sb = ['"'];
  for (var i = 0; i < s.length; i++) {
    var ch = s.charAt(i);
    var cc = ch.charCodeAt(0);
    sb[i + 1] = goog.string.specialEscapeChars_[ch] ||
        ((cc > 31 && cc < 127) ? ch : goog.string.escapeChar(ch));
  }
  sb.push('"');
  return sb.join('');
};


/**
 * Takes a string and returns the escaped string for that character.
 * @param {string} str The string to escape.
 * @return {string} An escaped string representing {@code str}.
 */
goog.string.escapeString = function(str) {
  var sb = [];
  for (var i = 0; i < str.length; i++) {
    sb[i] = goog.string.escapeChar(str.charAt(i));
  }
  return sb.join('');
};


/**
 * Takes a character and returns the escaped string for that character. For
 * example escapeChar(String.fromCharCode(15)) -> "\\x0E".
 * @param {string} c The character to escape.
 * @return {string} An escaped string representing {@code c}.
 */
goog.string.escapeChar = function(c) {
  if (c in goog.string.jsEscapeCache_) {
    return goog.string.jsEscapeCache_[c];
  }

  if (c in goog.string.specialEscapeChars_) {
    return goog.string.jsEscapeCache_[c] = goog.string.specialEscapeChars_[c];
  }

  var rv = c;
  var cc = c.charCodeAt(0);
  if (cc > 31 && cc < 127) {
    rv = c;
  } else {
    // tab is 9 but handled above
    if (cc < 256) {
      rv = '\\x';
      if (cc < 16 || cc > 256) {
        rv += '0';
      }
    } else {
      rv = '\\u';
      if (cc < 4096) {  // \u1000
        rv += '0';
      }
    }
    rv += cc.toString(16).toUpperCase();
  }

  return goog.string.jsEscapeCache_[c] = rv;
};


/**
 * Determines whether a string contains a substring.
 * @param {string} str The string to search.
 * @param {string} subString The substring to search for.
 * @return {boolean} Whether {@code str} contains {@code subString}.
 */
goog.string.contains = function(str, subString) {
  return str.indexOf(subString) != -1;
};


/**
 * Determines whether a string contains a substring, ignoring case.
 * @param {string} str The string to search.
 * @param {string} subString The substring to search for.
 * @return {boolean} Whether {@code str} contains {@code subString}.
 */
goog.string.caseInsensitiveContains = function(str, subString) {
  return goog.string.contains(str.toLowerCase(), subString.toLowerCase());
};


/**
 * Returns the non-overlapping occurrences of ss in s.
 * If either s or ss evalutes to false, then returns zero.
 * @param {string} s The string to look in.
 * @param {string} ss The string to look for.
 * @return {number} Number of occurrences of ss in s.
 */
goog.string.countOf = function(s, ss) {
  return s && ss ? s.split(ss).length - 1 : 0;
};


/**
 * Removes a substring of a specified length at a specific
 * index in a string.
 * @param {string} s The base string from which to remove.
 * @param {number} index The index at which to remove the substring.
 * @param {number} stringLength The length of the substring to remove.
 * @return {string} A copy of {@code s} with the substring removed or the full
 *     string if nothing is removed or the input is invalid.
 */
goog.string.removeAt = function(s, index, stringLength) {
  var resultStr = s;
  // If the index is greater or equal to 0 then remove substring
  if (index >= 0 && index < s.length && stringLength > 0) {
    resultStr = s.substr(0, index) +
        s.substr(index + stringLength, s.length - index - stringLength);
  }
  return resultStr;
};


/**
 *  Removes the first occurrence of a substring from a string.
 *  @param {string} s The base string from which to remove.
 *  @param {string} ss The string to remove.
 *  @return {string} A copy of {@code s} with {@code ss} removed or the full
 *      string if nothing is removed.
 */
goog.string.remove = function(s, ss) {
  var re = new RegExp(goog.string.regExpEscape(ss), '');
  return s.replace(re, '');
};


/**
 *  Removes all occurrences of a substring from a string.
 *  @param {string} s The base string from which to remove.
 *  @param {string} ss The string to remove.
 *  @return {string} A copy of {@code s} with {@code ss} removed or the full
 *      string if nothing is removed.
 */
goog.string.removeAll = function(s, ss) {
  var re = new RegExp(goog.string.regExpEscape(ss), 'g');
  return s.replace(re, '');
};


/**
 * Escapes characters in the string that are not safe to use in a RegExp.
 * @param {*} s The string to escape. If not a string, it will be casted
 *     to one.
 * @return {string} A RegExp safe, escaped copy of {@code s}.
 */
goog.string.regExpEscape = function(s) {
  return String(s)
      .replace(/([-()\[\]{}+?*.$\^|,:#<!\\])/g, '\\$1')
      .replace(/\x08/g, '\\x08');
};


/**
 * Repeats a string n times.
 * @param {string} string The string to repeat.
 * @param {number} length The number of times to repeat.
 * @return {string} A string containing {@code length} repetitions of
 *     {@code string}.
 */
goog.string.repeat = (String.prototype.repeat) ? function(string, length) {
  // The native method is over 100 times faster than the alternative.
  return string.repeat(length);
} : function(string, length) {
  return new Array(length + 1).join(string);
};


/**
 * Pads number to given length and optionally rounds it to a given precision.
 * For example:
 * <pre>padNumber(1.25, 2, 3) -> '01.250'
 * padNumber(1.25, 2) -> '01.25'
 * padNumber(1.25, 2, 1) -> '01.3'
 * padNumber(1.25, 0) -> '1.25'</pre>
 *
 * @param {number} num The number to pad.
 * @param {number} length The desired length.
 * @param {number=} opt_precision The desired precision.
 * @return {string} {@code num} as a string with the given options.
 */
goog.string.padNumber = function(num, length, opt_precision) {
  var s = goog.isDef(opt_precision) ? num.toFixed(opt_precision) : String(num);
  var index = s.indexOf('.');
  if (index == -1) {
    index = s.length;
  }
  return goog.string.repeat('0', Math.max(0, length - index)) + s;
};


/**
 * Returns a string representation of the given object, with
 * null and undefined being returned as the empty string.
 *
 * @param {*} obj The object to convert.
 * @return {string} A string representation of the {@code obj}.
 */
goog.string.makeSafe = function(obj) {
  return obj == null ? '' : String(obj);
};


/**
 * Concatenates string expressions. This is useful
 * since some browsers are very inefficient when it comes to using plus to
 * concat strings. Be careful when using null and undefined here since
 * these will not be included in the result. If you need to represent these
 * be sure to cast the argument to a String first.
 * For example:
 * <pre>buildString('a', 'b', 'c', 'd') -> 'abcd'
 * buildString(null, undefined) -> ''
 * </pre>
 * @param {...*} var_args A list of strings to concatenate. If not a string,
 *     it will be casted to one.
 * @return {string} The concatenation of {@code var_args}.
 */
goog.string.buildString = function(var_args) {
  return Array.prototype.join.call(arguments, '');
};


/**
 * Returns a string with at least 64-bits of randomness.
 *
 * Doesn't trust Javascript's random function entirely. Uses a combination of
 * random and current timestamp, and then encodes the string in base-36 to
 * make it shorter.
 *
 * @return {string} A random string, e.g. sn1s7vb4gcic.
 */
goog.string.getRandomString = function() {
  var x = 2147483648;
  return Math.floor(Math.random() * x).toString(36) +
      Math.abs(Math.floor(Math.random() * x) ^ goog.now()).toString(36);
};


/**
 * Compares two version numbers.
 *
 * @param {string|number} version1 Version of first item.
 * @param {string|number} version2 Version of second item.
 *
 * @return {number}  1 if {@code version1} is higher.
 *                   0 if arguments are equal.
 *                  -1 if {@code version2} is higher.
 */
goog.string.compareVersions = function(version1, version2) {
  var order = 0;
  // Trim leading and trailing whitespace and split the versions into
  // subversions.
  var v1Subs = goog.string.trim(String(version1)).split('.');
  var v2Subs = goog.string.trim(String(version2)).split('.');
  var subCount = Math.max(v1Subs.length, v2Subs.length);

  // Iterate over the subversions, as long as they appear to be equivalent.
  for (var subIdx = 0; order == 0 && subIdx < subCount; subIdx++) {
    var v1Sub = v1Subs[subIdx] || '';
    var v2Sub = v2Subs[subIdx] || '';

    // Split the subversions into pairs of numbers and qualifiers (like 'b').
    // Two different RegExp objects are needed because they are both using
    // the 'g' flag.
    var v1CompParser = new RegExp('(\\d*)(\\D*)', 'g');
    var v2CompParser = new RegExp('(\\d*)(\\D*)', 'g');
    do {
      var v1Comp = v1CompParser.exec(v1Sub) || ['', '', ''];
      var v2Comp = v2CompParser.exec(v2Sub) || ['', '', ''];
      // Break if there are no more matches.
      if (v1Comp[0].length == 0 && v2Comp[0].length == 0) {
        break;
      }

      // Parse the numeric part of the subversion. A missing number is
      // equivalent to 0.
      var v1CompNum = v1Comp[1].length == 0 ? 0 : parseInt(v1Comp[1], 10);
      var v2CompNum = v2Comp[1].length == 0 ? 0 : parseInt(v2Comp[1], 10);

      // Compare the subversion components. The number has the highest
      // precedence. Next, if the numbers are equal, a subversion without any
      // qualifier is always higher than a subversion with any qualifier. Next,
      // the qualifiers are compared as strings.
      order = goog.string.compareElements_(v1CompNum, v2CompNum) ||
          goog.string.compareElements_(
              v1Comp[2].length == 0, v2Comp[2].length == 0) ||
          goog.string.compareElements_(v1Comp[2], v2Comp[2]);
      // Stop as soon as an inequality is discovered.
    } while (order == 0);
  }

  return order;
};


/**
 * Compares elements of a version number.
 *
 * @param {string|number|boolean} left An element from a version number.
 * @param {string|number|boolean} right An element from a version number.
 *
 * @return {number}  1 if {@code left} is higher.
 *                   0 if arguments are equal.
 *                  -1 if {@code right} is higher.
 * @private
 */
goog.string.compareElements_ = function(left, right) {
  if (left < right) {
    return -1;
  } else if (left > right) {
    return 1;
  }
  return 0;
};


/**
 * String hash function similar to java.lang.String.hashCode().
 * The hash code for a string is computed as
 * s[0] * 31 ^ (n - 1) + s[1] * 31 ^ (n - 2) + ... + s[n - 1],
 * where s[i] is the ith character of the string and n is the length of
 * the string. We mod the result to make it between 0 (inclusive) and 2^32
 * (exclusive).
 * @param {string} str A string.
 * @return {number} Hash value for {@code str}, between 0 (inclusive) and 2^32
 *  (exclusive). The empty string returns 0.
 */
goog.string.hashCode = function(str) {
  var result = 0;
  for (var i = 0; i < str.length; ++i) {
    // Normalize to 4 byte range, 0 ... 2^32.
    result = (31 * result + str.charCodeAt(i)) >>> 0;
  }
  return result;
};


/**
 * The most recent unique ID. |0 is equivalent to Math.floor in this case.
 * @type {number}
 * @private
 */
goog.string.uniqueStringCounter_ = Math.random() * 0x80000000 | 0;


/**
 * Generates and returns a string which is unique in the current document.
 * This is useful, for example, to create unique IDs for DOM elements.
 * @return {string} A unique id.
 */
goog.string.createUniqueString = function() {
  return 'goog_' + goog.string.uniqueStringCounter_++;
};


/**
 * Converts the supplied string to a number, which may be Infinity or NaN.
 * This function strips whitespace: (toNumber(' 123') === 123)
 * This function accepts scientific notation: (toNumber('1e1') === 10)
 *
 * This is better than Javascript's built-in conversions because, sadly:
 *     (Number(' ') === 0) and (parseFloat('123a') === 123)
 *
 * @param {string} str The string to convert.
 * @return {number} The number the supplied string represents, or NaN.
 */
goog.string.toNumber = function(str) {
  var num = Number(str);
  if (num == 0 && goog.string.isEmptyOrWhitespace(str)) {
    return NaN;
  }
  return num;
};


/**
 * Returns whether the given string is lower camel case (e.g. "isFooBar").
 *
 * Note that this assumes the string is entirely letters.
 * @see http://en.wikipedia.org/wiki/CamelCase#Variations_and_synonyms
 *
 * @param {string} str String to test.
 * @return {boolean} Whether the string is lower camel case.
 */
goog.string.isLowerCamelCase = function(str) {
  return /^[a-z]+([A-Z][a-z]*)*$/.test(str);
};


/**
 * Returns whether the given string is upper camel case (e.g. "FooBarBaz").
 *
 * Note that this assumes the string is entirely letters.
 * @see http://en.wikipedia.org/wiki/CamelCase#Variations_and_synonyms
 *
 * @param {string} str String to test.
 * @return {boolean} Whether the string is upper camel case.
 */
goog.string.isUpperCamelCase = function(str) {
  return /^([A-Z][a-z]*)+$/.test(str);
};


/**
 * Converts a string from selector-case to camelCase (e.g. from
 * "multi-part-string" to "multiPartString"), useful for converting
 * CSS selectors and HTML dataset keys to their equivalent JS properties.
 * @param {string} str The string in selector-case form.
 * @return {string} The string in camelCase form.
 */
goog.string.toCamelCase = function(str) {
  return String(str).replace(
      /\-([a-z])/g, function(all, match) { return match.toUpperCase(); });
};


/**
 * Converts a string from camelCase to selector-case (e.g. from
 * "multiPartString" to "multi-part-string"), useful for converting JS
 * style and dataset properties to equivalent CSS selectors and HTML keys.
 * @param {string} str The string in camelCase form.
 * @return {string} The string in selector-case form.
 */
goog.string.toSelectorCase = function(str) {
  return String(str).replace(/([A-Z])/g, '-$1').toLowerCase();
};


/**
 * Converts a string into TitleCase. First character of the string is always
 * capitalized in addition to the first letter of every subsequent word.
 * Words are delimited by one or more whitespaces by default. Custom delimiters
 * can optionally be specified to replace the default, which doesn't preserve
 * whitespace delimiters and instead must be explicitly included if needed.
 *
 * Default delimiter => " ":
 *    goog.string.toTitleCase('oneTwoThree')    => 'OneTwoThree'
 *    goog.string.toTitleCase('one two three')  => 'One Two Three'
 *    goog.string.toTitleCase('  one   two   ') => '  One   Two   '
 *    goog.string.toTitleCase('one_two_three')  => 'One_two_three'
 *    goog.string.toTitleCase('one-two-three')  => 'One-two-three'
 *
 * Custom delimiter => "_-.":
 *    goog.string.toTitleCase('oneTwoThree', '_-.')       => 'OneTwoThree'
 *    goog.string.toTitleCase('one two three', '_-.')     => 'One two three'
 *    goog.string.toTitleCase('  one   two   ', '_-.')    => '  one   two   '
 *    goog.string.toTitleCase('one_two_three', '_-.')     => 'One_Two_Three'
 *    goog.string.toTitleCase('one-two-three', '_-.')     => 'One-Two-Three'
 *    goog.string.toTitleCase('one...two...three', '_-.') => 'One...Two...Three'
 *    goog.string.toTitleCase('one. two. three', '_-.')   => 'One. two. three'
 *    goog.string.toTitleCase('one-two.three', '_-.')     => 'One-Two.Three'
 *
 * @param {string} str String value in camelCase form.
 * @param {string=} opt_delimiters Custom delimiter character set used to
 *      distinguish words in the string value. Each character represents a
 *      single delimiter. When provided, default whitespace delimiter is
 *      overridden and must be explicitly included if needed.
 * @return {string} String value in TitleCase form.
 */
goog.string.toTitleCase = function(str, opt_delimiters) {
  var delimiters = goog.isString(opt_delimiters) ?
      goog.string.regExpEscape(opt_delimiters) :
      '\\s';

  // For IE8, we need to prevent using an empty character set. Otherwise,
  // incorrect matching will occur.
  delimiters = delimiters ? '|[' + delimiters + ']+' : '';

  var regexp = new RegExp('(^' + delimiters + ')([a-z])', 'g');
  return str.replace(
      regexp, function(all, p1, p2) { return p1 + p2.toUpperCase(); });
};


/**
 * Capitalizes a string, i.e. converts the first letter to uppercase
 * and all other letters to lowercase, e.g.:
 *
 * goog.string.capitalize('one')     => 'One'
 * goog.string.capitalize('ONE')     => 'One'
 * goog.string.capitalize('one two') => 'One two'
 *
 * Note that this function does not trim initial whitespace.
 *
 * @param {string} str String value to capitalize.
 * @return {string} String value with first letter in uppercase.
 */
goog.string.capitalize = function(str) {
  return String(str.charAt(0)).toUpperCase() +
      String(str.substr(1)).toLowerCase();
};


/**
 * Parse a string in decimal or hexidecimal ('0xFFFF') form.
 *
 * To parse a particular radix, please use parseInt(string, radix) directly. See
 * https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/parseInt
 *
 * This is a wrapper for the built-in parseInt function that will only parse
 * numbers as base 10 or base 16.  Some JS implementations assume strings
 * starting with "0" are intended to be octal. ES3 allowed but discouraged
 * this behavior. ES5 forbids it.  This function emulates the ES5 behavior.
 *
 * For more information, see Mozilla JS Reference: http://goo.gl/8RiFj
 *
 * @param {string|number|null|undefined} value The value to be parsed.
 * @return {number} The number, parsed. If the string failed to parse, this
 *     will be NaN.
 */
goog.string.parseInt = function(value) {
  // Force finite numbers to strings.
  if (isFinite(value)) {
    value = String(value);
  }

  if (goog.isString(value)) {
    // If the string starts with '0x' or '-0x', parse as hex.
    return /^\s*-?0x/i.test(value) ? parseInt(value, 16) : parseInt(value, 10);
  }

  return NaN;
};


/**
 * Splits a string on a separator a limited number of times.
 *
 * This implementation is more similar to Python or Java, where the limit
 * parameter specifies the maximum number of splits rather than truncating
 * the number of results.
 *
 * See http://docs.python.org/2/library/stdtypes.html#str.split
 * See JavaDoc: http://goo.gl/F2AsY
 * See Mozilla reference: http://goo.gl/dZdZs
 *
 * @param {string} str String to split.
 * @param {string} separator The separator.
 * @param {number} limit The limit to the number of splits. The resulting array
 *     will have a maximum length of limit+1.  Negative numbers are the same
 *     as zero.
 * @return {!Array<string>} The string, split.
 */
goog.string.splitLimit = function(str, separator, limit) {
  var parts = str.split(separator);
  var returnVal = [];

  // Only continue doing this while we haven't hit the limit and we have
  // parts left.
  while (limit > 0 && parts.length) {
    returnVal.push(parts.shift());
    limit--;
  }

  // If there are remaining parts, append them to the end.
  if (parts.length) {
    returnVal.push(parts.join(separator));
  }

  return returnVal;
};


/**
 * Finds the characters to the right of the last instance of any separator
 *
 * This function is similar to goog.string.path.baseName, except it can take a
 * list of characters to split the string on. It will return the rightmost
 * grouping of characters to the right of any separator as a left-to-right
 * oriented string.
 *
 * @see goog.string.path.baseName
 * @param {string} str The string
 * @param {string|!Array<string>} separators A list of separator characters
 * @return {string} The last part of the string with respect to the separators
 */
goog.string.lastComponent = function(str, separators) {
  if (!separators) {
    return str;
  } else if (typeof separators == 'string') {
    separators = [separators];
  }

  var lastSeparatorIndex = -1;
  for (var i = 0; i < separators.length; i++) {
    if (separators[i] == '') {
      continue;
    }
    var currentSeparatorIndex = str.lastIndexOf(separators[i]);
    if (currentSeparatorIndex > lastSeparatorIndex) {
      lastSeparatorIndex = currentSeparatorIndex;
    }
  }
  if (lastSeparatorIndex == -1) {
    return str;
  }
  return str.slice(lastSeparatorIndex + 1);
};


/**
 * Computes the Levenshtein edit distance between two strings.
 * @param {string} a
 * @param {string} b
 * @return {number} The edit distance between the two strings.
 */
goog.string.editDistance = function(a, b) {
  var v0 = [];
  var v1 = [];

  if (a == b) {
    return 0;
  }

  if (!a.length || !b.length) {
    return Math.max(a.length, b.length);
  }

  for (var i = 0; i < b.length + 1; i++) {
    v0[i] = i;
  }

  for (var i = 0; i < a.length; i++) {
    v1[0] = i + 1;

    for (var j = 0; j < b.length; j++) {
      var cost = Number(a[i] != b[j]);
      // Cost for the substring is the minimum of adding one character, removing
      // one character, or a swap.
      v1[j + 1] = Math.min(v1[j] + 1, v0[j + 1] + 1, v0[j] + cost);
    }

    for (var j = 0; j < v0.length; j++) {
      v0[j] = v1[j];
    }
  }

  return v1[b.length];
};

// Copyright 2008 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/**
 * @fileoverview Utilities to check the preconditions, postconditions and
 * invariants runtime.
 *
 * Methods in this package should be given special treatment by the compiler
 * for type-inference. For example, <code>goog.asserts.assert(foo)</code>
 * will restrict <code>foo</code> to a truthy value.
 *
 * The compiler has an option to disable asserts. So code like:
 * <code>
 * var x = goog.asserts.assert(foo()); goog.asserts.assert(bar());
 * </code>
 * will be transformed into:
 * <code>
 * var x = foo();
 * </code>
 * The compiler will leave in foo() (because its return value is used),
 * but it will remove bar() because it assumes it does not have side-effects.
 *
 * @author agrieve@google.com (Andrew Grieve)
 */

goog.provide('goog.asserts');
goog.provide('goog.asserts.AssertionError');

goog.require('goog.debug.Error');
goog.require('goog.dom.NodeType');
goog.require('goog.string');


/**
 * @define {boolean} Whether to strip out asserts or to leave them in.
 */
goog.define('goog.asserts.ENABLE_ASSERTS', goog.DEBUG);



/**
 * Error object for failed assertions.
 * @param {string} messagePattern The pattern that was used to form message.
 * @param {!Array<*>} messageArgs The items to substitute into the pattern.
 * @constructor
 * @extends {goog.debug.Error}
 * @final
 */
goog.asserts.AssertionError = function(messagePattern, messageArgs) {
  messageArgs.unshift(messagePattern);
  goog.debug.Error.call(this, goog.string.subs.apply(null, messageArgs));
  // Remove the messagePattern afterwards to avoid permanently modifying the
  // passed in array.
  messageArgs.shift();

  /**
   * The message pattern used to format the error message. Error handlers can
   * use this to uniquely identify the assertion.
   * @type {string}
   */
  this.messagePattern = messagePattern;
};
goog.inherits(goog.asserts.AssertionError, goog.debug.Error);


/** @override */
goog.asserts.AssertionError.prototype.name = 'AssertionError';


/**
 * The default error handler.
 * @param {!goog.asserts.AssertionError} e The exception to be handled.
 */
goog.asserts.DEFAULT_ERROR_HANDLER = function(e) {
  throw e;
};


/**
 * The handler responsible for throwing or logging assertion errors.
 * @private {function(!goog.asserts.AssertionError)}
 */
goog.asserts.errorHandler_ = goog.asserts.DEFAULT_ERROR_HANDLER;


/**
 * Throws an exception with the given message and "Assertion failed" prefixed
 * onto it.
 * @param {string} defaultMessage The message to use if givenMessage is empty.
 * @param {Array<*>} defaultArgs The substitution arguments for defaultMessage.
 * @param {string|undefined} givenMessage Message supplied by the caller.
 * @param {Array<*>} givenArgs The substitution arguments for givenMessage.
 * @throws {goog.asserts.AssertionError} When the value is not a number.
 * @private
 */
goog.asserts.doAssertFailure_ = function(
    defaultMessage, defaultArgs, givenMessage, givenArgs) {
  var message = 'Assertion failed';
  if (givenMessage) {
    message += ': ' + givenMessage;
    var args = givenArgs;
  } else if (defaultMessage) {
    message += ': ' + defaultMessage;
    args = defaultArgs;
  }
  // The '' + works around an Opera 10 bug in the unit tests. Without it,
  // a stack trace is added to var message above. With this, a stack trace is
  // not added until this line (it causes the extra garbage to be added after
  // the assertion message instead of in the middle of it).
  var e = new goog.asserts.AssertionError('' + message, args || []);
  goog.asserts.errorHandler_(e);
};


/**
 * Sets a custom error handler that can be used to customize the behavior of
 * assertion failures, for example by turning all assertion failures into log
 * messages.
 * @param {function(!goog.asserts.AssertionError)} errorHandler
 */
goog.asserts.setErrorHandler = function(errorHandler) {
  if (goog.asserts.ENABLE_ASSERTS) {
    goog.asserts.errorHandler_ = errorHandler;
  }
};


/**
 * Checks if the condition evaluates to true if goog.asserts.ENABLE_ASSERTS is
 * true.
 * @template T
 * @param {T} condition The condition to check.
 * @param {string=} opt_message Error message in case of failure.
 * @param {...*} var_args The items to substitute into the failure message.
 * @return {T} The value of the condition.
 * @throws {goog.asserts.AssertionError} When the condition evaluates to false.
 */
goog.asserts.assert = function(condition, opt_message, var_args) {
  if (goog.asserts.ENABLE_ASSERTS && !condition) {
    goog.asserts.doAssertFailure_(
        '', null, opt_message, Array.prototype.slice.call(arguments, 2));
  }
  return condition;
};


/**
 * Fails if goog.asserts.ENABLE_ASSERTS is true. This function is useful in case
 * when we want to add a check in the unreachable area like switch-case
 * statement:
 *
 * <pre>
 *  switch(type) {
 *    case FOO: doSomething(); break;
 *    case BAR: doSomethingElse(); break;
 *    default: goog.asserts.fail('Unrecognized type: ' + type);
 *      // We have only 2 types - "default:" section is unreachable code.
 *  }
 * </pre>
 *
 * @param {string=} opt_message Error message in case of failure.
 * @param {...*} var_args The items to substitute into the failure message.
 * @throws {goog.asserts.AssertionError} Failure.
 */
goog.asserts.fail = function(opt_message, var_args) {
  if (goog.asserts.ENABLE_ASSERTS) {
    goog.asserts.errorHandler_(
        new goog.asserts.AssertionError(
            'Failure' + (opt_message ? ': ' + opt_message : ''),
            Array.prototype.slice.call(arguments, 1)));
  }
};


/**
 * Checks if the value is a number if goog.asserts.ENABLE_ASSERTS is true.
 * @param {*} value The value to check.
 * @param {string=} opt_message Error message in case of failure.
 * @param {...*} var_args The items to substitute into the failure message.
 * @return {number} The value, guaranteed to be a number when asserts enabled.
 * @throws {goog.asserts.AssertionError} When the value is not a number.
 */
goog.asserts.assertNumber = function(value, opt_message, var_args) {
  if (goog.asserts.ENABLE_ASSERTS && !goog.isNumber(value)) {
    goog.asserts.doAssertFailure_(
        'Expected number but got %s: %s.', [goog.typeOf(value), value],
        opt_message, Array.prototype.slice.call(arguments, 2));
  }
  return /** @type {number} */ (value);
};


/**
 * Checks if the value is a string if goog.asserts.ENABLE_ASSERTS is true.
 * @param {*} value The value to check.
 * @param {string=} opt_message Error message in case of failure.
 * @param {...*} var_args The items to substitute into the failure message.
 * @return {string} The value, guaranteed to be a string when asserts enabled.
 * @throws {goog.asserts.AssertionError} When the value is not a string.
 */
goog.asserts.assertString = function(value, opt_message, var_args) {
  if (goog.asserts.ENABLE_ASSERTS && !goog.isString(value)) {
    goog.asserts.doAssertFailure_(
        'Expected string but got %s: %s.', [goog.typeOf(value), value],
        opt_message, Array.prototype.slice.call(arguments, 2));
  }
  return /** @type {string} */ (value);
};


/**
 * Checks if the value is a function if goog.asserts.ENABLE_ASSERTS is true.
 * @param {*} value The value to check.
 * @param {string=} opt_message Error message in case of failure.
 * @param {...*} var_args The items to substitute into the failure message.
 * @return {!Function} The value, guaranteed to be a function when asserts
 *     enabled.
 * @throws {goog.asserts.AssertionError} When the value is not a function.
 */
goog.asserts.assertFunction = function(value, opt_message, var_args) {
  if (goog.asserts.ENABLE_ASSERTS && !goog.isFunction(value)) {
    goog.asserts.doAssertFailure_(
        'Expected function but got %s: %s.', [goog.typeOf(value), value],
        opt_message, Array.prototype.slice.call(arguments, 2));
  }
  return /** @type {!Function} */ (value);
};


/**
 * Checks if the value is an Object if goog.asserts.ENABLE_ASSERTS is true.
 * @param {*} value The value to check.
 * @param {string=} opt_message Error message in case of failure.
 * @param {...*} var_args The items to substitute into the failure message.
 * @return {!Object} The value, guaranteed to be a non-null object.
 * @throws {goog.asserts.AssertionError} When the value is not an object.
 */
goog.asserts.assertObject = function(value, opt_message, var_args) {
  if (goog.asserts.ENABLE_ASSERTS && !goog.isObject(value)) {
    goog.asserts.doAssertFailure_(
        'Expected object but got %s: %s.', [goog.typeOf(value), value],
        opt_message, Array.prototype.slice.call(arguments, 2));
  }
  return /** @type {!Object} */ (value);
};


/**
 * Checks if the value is an Array if goog.asserts.ENABLE_ASSERTS is true.
 * @param {*} value The value to check.
 * @param {string=} opt_message Error message in case of failure.
 * @param {...*} var_args The items to substitute into the failure message.
 * @return {!Array<?>} The value, guaranteed to be a non-null array.
 * @throws {goog.asserts.AssertionError} When the value is not an array.
 */
goog.asserts.assertArray = function(value, opt_message, var_args) {
  if (goog.asserts.ENABLE_ASSERTS && !goog.isArray(value)) {
    goog.asserts.doAssertFailure_(
        'Expected array but got %s: %s.', [goog.typeOf(value), value],
        opt_message, Array.prototype.slice.call(arguments, 2));
  }
  return /** @type {!Array<?>} */ (value);
};


/**
 * Checks if the value is a boolean if goog.asserts.ENABLE_ASSERTS is true.
 * @param {*} value The value to check.
 * @param {string=} opt_message Error message in case of failure.
 * @param {...*} var_args The items to substitute into the failure message.
 * @return {boolean} The value, guaranteed to be a boolean when asserts are
 *     enabled.
 * @throws {goog.asserts.AssertionError} When the value is not a boolean.
 */
goog.asserts.assertBoolean = function(value, opt_message, var_args) {
  if (goog.asserts.ENABLE_ASSERTS && !goog.isBoolean(value)) {
    goog.asserts.doAssertFailure_(
        'Expected boolean but got %s: %s.', [goog.typeOf(value), value],
        opt_message, Array.prototype.slice.call(arguments, 2));
  }
  return /** @type {boolean} */ (value);
};


/**
 * Checks if the value is a DOM Element if goog.asserts.ENABLE_ASSERTS is true.
 * @param {*} value The value to check.
 * @param {string=} opt_message Error message in case of failure.
 * @param {...*} var_args The items to substitute into the failure message.
 * @return {!Element} The value, likely to be a DOM Element when asserts are
 *     enabled.
 * @throws {goog.asserts.AssertionError} When the value is not an Element.
 */
goog.asserts.assertElement = function(value, opt_message, var_args) {
  if (goog.asserts.ENABLE_ASSERTS &&
      (!goog.isObject(value) || value.nodeType != goog.dom.NodeType.ELEMENT)) {
    goog.asserts.doAssertFailure_(
        'Expected Element but got %s: %s.', [goog.typeOf(value), value],
        opt_message, Array.prototype.slice.call(arguments, 2));
  }
  return /** @type {!Element} */ (value);
};


/**
 * Checks if the value is an instance of the user-defined type if
 * goog.asserts.ENABLE_ASSERTS is true.
 *
 * The compiler may tighten the type returned by this function.
 *
 * @param {?} value The value to check.
 * @param {function(new: T, ...)} type A user-defined constructor.
 * @param {string=} opt_message Error message in case of failure.
 * @param {...*} var_args The items to substitute into the failure message.
 * @throws {goog.asserts.AssertionError} When the value is not an instance of
 *     type.
 * @return {T}
 * @template T
 */
goog.asserts.assertInstanceof = function(value, type, opt_message, var_args) {
  if (goog.asserts.ENABLE_ASSERTS && !(value instanceof type)) {
    goog.asserts.doAssertFailure_(
        'Expected instanceof %s but got %s.',
        [goog.asserts.getType_(type), goog.asserts.getType_(value)],
        opt_message, Array.prototype.slice.call(arguments, 3));
  }
  return value;
};


/**
 * Checks that no enumerable keys are present in Object.prototype. Such keys
 * would break most code that use {@code for (var ... in ...)} loops.
 */
goog.asserts.assertObjectPrototypeIsIntact = function() {
  for (var key in Object.prototype) {
    goog.asserts.fail(key + ' should not be enumerable in Object.prototype.');
  }
};


/**
 * Returns the type of a value. If a constructor is passed, and a suitable
 * string cannot be found, 'unknown type name' will be returned.
 * @param {*} value A constructor, object, or primitive.
 * @return {string} The best display name for the value, or 'unknown type name'.
 * @private
 */
goog.asserts.getType_ = function(value) {
  if (value instanceof Function) {
    return value.displayName || value.name || 'unknown type name';
  } else if (value instanceof Object) {
    return value.constructor.displayName || value.constructor.name ||
        Object.prototype.toString.call(value);
  } else {
    return value === null ? 'null' : typeof value;
  }
};

// Copyright 2006 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/**
 * @fileoverview Utilities for manipulating arrays.
 *
 * @author arv@google.com (Erik Arvidsson)
 */


goog.provide('goog.array');

goog.require('goog.asserts');


/**
 * @define {boolean} NATIVE_ARRAY_PROTOTYPES indicates whether the code should
 * rely on Array.prototype functions, if available.
 *
 * The Array.prototype functions can be defined by external libraries like
 * Prototype and setting this flag to false forces closure to use its own
 * goog.array implementation.
 *
 * If your javascript can be loaded by a third party site and you are wary about
 * relying on the prototype functions, specify
 * "--define goog.NATIVE_ARRAY_PROTOTYPES=false" to the JSCompiler.
 *
 * Setting goog.TRUSTED_SITE to false will automatically set
 * NATIVE_ARRAY_PROTOTYPES to false.
 */
goog.define('goog.NATIVE_ARRAY_PROTOTYPES', goog.TRUSTED_SITE);


/**
 * @define {boolean} If true, JSCompiler will use the native implementation of
 * array functions where appropriate (e.g., {@code Array#filter}) and remove the
 * unused pure JS implementation.
 */
goog.define('goog.array.ASSUME_NATIVE_FUNCTIONS', false);


/**
 * Returns the last element in an array without removing it.
 * Same as goog.array.last.
 * @param {IArrayLike<T>|string} array The array.
 * @return {T} Last item in array.
 * @template T
 */
goog.array.peek = function(array) {
  return array[array.length - 1];
};


/**
 * Returns the last element in an array without removing it.
 * Same as goog.array.peek.
 * @param {IArrayLike<T>|string} array The array.
 * @return {T} Last item in array.
 * @template T
 */
goog.array.last = goog.array.peek;

// NOTE(arv): Since most of the array functions are generic it allows you to
// pass an array-like object. Strings have a length and are considered array-
// like. However, the 'in' operator does not work on strings so we cannot just
// use the array path even if the browser supports indexing into strings. We
// therefore end up splitting the string.


/**
 * Returns the index of the first element of an array with a specified value, or
 * -1 if the element is not present in the array.
 *
 * See {@link http://tinyurl.com/developer-mozilla-org-array-indexof}
 *
 * @param {IArrayLike<T>|string} arr The array to be searched.
 * @param {T} obj The object for which we are searching.
 * @param {number=} opt_fromIndex The index at which to start the search. If
 *     omitted the search starts at index 0.
 * @return {number} The index of the first matching array element.
 * @template T
 */
goog.array.indexOf = goog.NATIVE_ARRAY_PROTOTYPES &&
        (goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.indexOf) ?
    function(arr, obj, opt_fromIndex) {
      goog.asserts.assert(arr.length != null);

      return Array.prototype.indexOf.call(arr, obj, opt_fromIndex);
    } :
    function(arr, obj, opt_fromIndex) {
      var fromIndex = opt_fromIndex == null ?
          0 :
          (opt_fromIndex < 0 ? Math.max(0, arr.length + opt_fromIndex) :
                               opt_fromIndex);

      if (goog.isString(arr)) {
        // Array.prototype.indexOf uses === so only strings should be found.
        if (!goog.isString(obj) || obj.length != 1) {
          return -1;
        }
        return arr.indexOf(obj, fromIndex);
      }

      for (var i = fromIndex; i < arr.length; i++) {
        if (i in arr && arr[i] === obj) return i;
      }
      return -1;
    };


/**
 * Returns the index of the last element of an array with a specified value, or
 * -1 if the element is not present in the array.
 *
 * See {@link http://tinyurl.com/developer-mozilla-org-array-lastindexof}
 *
 * @param {!IArrayLike<T>|string} arr The array to be searched.
 * @param {T} obj The object for which we are searching.
 * @param {?number=} opt_fromIndex The index at which to start the search. If
 *     omitted the search starts at the end of the array.
 * @return {number} The index of the last matching array element.
 * @template T
 */
goog.array.lastIndexOf = goog.NATIVE_ARRAY_PROTOTYPES &&
        (goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.lastIndexOf) ?
    function(arr, obj, opt_fromIndex) {
      goog.asserts.assert(arr.length != null);

      // Firefox treats undefined and null as 0 in the fromIndex argument which
      // leads it to always return -1
      var fromIndex = opt_fromIndex == null ? arr.length - 1 : opt_fromIndex;
      return Array.prototype.lastIndexOf.call(arr, obj, fromIndex);
    } :
    function(arr, obj, opt_fromIndex) {
      var fromIndex = opt_fromIndex == null ? arr.length - 1 : opt_fromIndex;

      if (fromIndex < 0) {
        fromIndex = Math.max(0, arr.length + fromIndex);
      }

      if (goog.isString(arr)) {
        // Array.prototype.lastIndexOf uses === so only strings should be found.
        if (!goog.isString(obj) || obj.length != 1) {
          return -1;
        }
        return arr.lastIndexOf(obj, fromIndex);
      }

      for (var i = fromIndex; i >= 0; i--) {
        if (i in arr && arr[i] === obj) return i;
      }
      return -1;
    };


/**
 * Calls a function for each element in an array. Skips holes in the array.
 * See {@link http://tinyurl.com/developer-mozilla-org-array-foreach}
 *
 * @param {IArrayLike<T>|string} arr Array or array like object over
 *     which to iterate.
 * @param {?function(this: S, T, number, ?): ?} f The function to call for every
 *     element. This function takes 3 arguments (the element, the index and the
 *     array). The return value is ignored.
 * @param {S=} opt_obj The object to be used as the value of 'this' within f.
 * @template T,S
 */
goog.array.forEach = goog.NATIVE_ARRAY_PROTOTYPES &&
        (goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.forEach) ?
    function(arr, f, opt_obj) {
      goog.asserts.assert(arr.length != null);

      Array.prototype.forEach.call(arr, f, opt_obj);
    } :
    function(arr, f, opt_obj) {
      var l = arr.length;  // must be fixed during loop... see docs
      var arr2 = goog.isString(arr) ? arr.split('') : arr;
      for (var i = 0; i < l; i++) {
        if (i in arr2) {
          f.call(/** @type {?} */ (opt_obj), arr2[i], i, arr);
        }
      }
    };


/**
 * Calls a function for each element in an array, starting from the last
 * element rather than the first.
 *
 * @param {IArrayLike<T>|string} arr Array or array
 *     like object over which to iterate.
 * @param {?function(this: S, T, number, ?): ?} f The function to call for every
 *     element. This function
 *     takes 3 arguments (the element, the index and the array). The return
 *     value is ignored.
 * @param {S=} opt_obj The object to be used as the value of 'this'
 *     within f.
 * @template T,S
 */
goog.array.forEachRight = function(arr, f, opt_obj) {
  var l = arr.length;  // must be fixed during loop... see docs
  var arr2 = goog.isString(arr) ? arr.split('') : arr;
  for (var i = l - 1; i >= 0; --i) {
    if (i in arr2) {
      f.call(/** @type {?} */ (opt_obj), arr2[i], i, arr);
    }
  }
};


/**
 * Calls a function for each element in an array, and if the function returns
 * true adds the element to a new array.
 *
 * See {@link http://tinyurl.com/developer-mozilla-org-array-filter}
 *
 * @param {IArrayLike<T>|string} arr Array or array
 *     like object over which to iterate.
 * @param {?function(this:S, T, number, ?):boolean} f The function to call for
 *     every element. This function
 *     takes 3 arguments (the element, the index and the array) and must
 *     return a Boolean. If the return value is true the element is added to the
 *     result array. If it is false the element is not included.
 * @param {S=} opt_obj The object to be used as the value of 'this'
 *     within f.
 * @return {!Array<T>} a new array in which only elements that passed the test
 *     are present.
 * @template T,S
 */
goog.array.filter = goog.NATIVE_ARRAY_PROTOTYPES &&
        (goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.filter) ?
    function(arr, f, opt_obj) {
      goog.asserts.assert(arr.length != null);

      return Array.prototype.filter.call(arr, f, opt_obj);
    } :
    function(arr, f, opt_obj) {
      var l = arr.length;  // must be fixed during loop... see docs
      var res = [];
      var resLength = 0;
      var arr2 = goog.isString(arr) ? arr.split('') : arr;
      for (var i = 0; i < l; i++) {
        if (i in arr2) {
          var val = arr2[i];  // in case f mutates arr2
          if (f.call(/** @type {?} */ (opt_obj), val, i, arr)) {
            res[resLength++] = val;
          }
        }
      }
      return res;
    };


/**
 * Calls a function for each element in an array and inserts the result into a
 * new array.
 *
 * See {@link http://tinyurl.com/developer-mozilla-org-array-map}
 *
 * @param {IArrayLike<VALUE>|string} arr Array or array like object
 *     over which to iterate.
 * @param {function(this:THIS, VALUE, number, ?): RESULT} f The function to call
 *     for every element. This function takes 3 arguments (the element,
 *     the index and the array) and should return something. The result will be
 *     inserted into a new array.
 * @param {THIS=} opt_obj The object to be used as the value of 'this' within f.
 * @return {!Array<RESULT>} a new array with the results from f.
 * @template THIS, VALUE, RESULT
 */
goog.array.map = goog.NATIVE_ARRAY_PROTOTYPES &&
        (goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.map) ?
    function(arr, f, opt_obj) {
      goog.asserts.assert(arr.length != null);

      return Array.prototype.map.call(arr, f, opt_obj);
    } :
    function(arr, f, opt_obj) {
      var l = arr.length;  // must be fixed during loop... see docs
      var res = new Array(l);
      var arr2 = goog.isString(arr) ? arr.split('') : arr;
      for (var i = 0; i < l; i++) {
        if (i in arr2) {
          res[i] = f.call(/** @type {?} */ (opt_obj), arr2[i], i, arr);
        }
      }
      return res;
    };


/**
 * Passes every element of an array into a function and accumulates the result.
 *
 * See {@link http://tinyurl.com/developer-mozilla-org-array-reduce}
 *
 * For example:
 * var a = [1, 2, 3, 4];
 * goog.array.reduce(a, function(r, v, i, arr) {return r + v;}, 0);
 * returns 10
 *
 * @param {IArrayLike<T>|string} arr Array or array
 *     like object over which to iterate.
 * @param {function(this:S, R, T, number, ?) : R} f The function to call for
 *     every element. This function
 *     takes 4 arguments (the function's previous result or the initial value,
 *     the value of the current array element, the current array index, and the
 *     array itself)
 *     function(previousValue, currentValue, index, array).
 * @param {?} val The initial value to pass into the function on the first call.
 * @param {S=} opt_obj  The object to be used as the value of 'this'
 *     within f.
 * @return {R} Result of evaluating f repeatedly across the values of the array.
 * @template T,S,R
 */
goog.array.reduce = goog.NATIVE_ARRAY_PROTOTYPES &&
        (goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.reduce) ?
    function(arr, f, val, opt_obj) {
      goog.asserts.assert(arr.length != null);
      if (opt_obj) {
        f = goog.bind(f, opt_obj);
      }
      return Array.prototype.reduce.call(arr, f, val);
    } :
    function(arr, f, val, opt_obj) {
      var rval = val;
      goog.array.forEach(arr, function(val, index) {
        rval = f.call(/** @type {?} */ (opt_obj), rval, val, index, arr);
      });
      return rval;
    };


/**
 * Passes every element of an array into a function and accumulates the result,
 * starting from the last element and working towards the first.
 *
 * See {@link http://tinyurl.com/developer-mozilla-org-array-reduceright}
 *
 * For example:
 * var a = ['a', 'b', 'c'];
 * goog.array.reduceRight(a, function(r, v, i, arr) {return r + v;}, '');
 * returns 'cba'
 *
 * @param {IArrayLike<T>|string} arr Array or array
 *     like object over which to iterate.
 * @param {?function(this:S, R, T, number, ?) : R} f The function to call for
 *     every element. This function
 *     takes 4 arguments (the function's previous result or the initial value,
 *     the value of the current array element, the current array index, and the
 *     array itself)
 *     function(previousValue, currentValue, index, array).
 * @param {?} val The initial value to pass into the function on the first call.
 * @param {S=} opt_obj The object to be used as the value of 'this'
 *     within f.
 * @return {R} Object returned as a result of evaluating f repeatedly across the
 *     values of the array.
 * @template T,S,R
 */
goog.array.reduceRight = goog.NATIVE_ARRAY_PROTOTYPES &&
        (goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.reduceRight) ?
    function(arr, f, val, opt_obj) {
      goog.asserts.assert(arr.length != null);
      goog.asserts.assert(f != null);
      if (opt_obj) {
        f = goog.bind(f, opt_obj);
      }
      return Array.prototype.reduceRight.call(arr, f, val);
    } :
    function(arr, f, val, opt_obj) {
      var rval = val;
      goog.array.forEachRight(arr, function(val, index) {
        rval = f.call(/** @type {?} */ (opt_obj), rval, val, index, arr);
      });
      return rval;
    };


/**
 * Calls f for each element of an array. If any call returns true, some()
 * returns true (without checking the remaining elements). If all calls
 * return false, some() returns false.
 *
 * See {@link http://tinyurl.com/developer-mozilla-org-array-some}
 *
 * @param {IArrayLike<T>|string} arr Array or array
 *     like object over which to iterate.
 * @param {?function(this:S, T, number, ?) : boolean} f The function to call for
 *     for every element. This function takes 3 arguments (the element, the
 *     index and the array) and should return a boolean.
 * @param {S=} opt_obj  The object to be used as the value of 'this'
 *     within f.
 * @return {boolean} true if any element passes the test.
 * @template T,S
 */
goog.array.some = goog.NATIVE_ARRAY_PROTOTYPES &&
        (goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.some) ?
    function(arr, f, opt_obj) {
      goog.asserts.assert(arr.length != null);

      return Array.prototype.some.call(arr, f, opt_obj);
    } :
    function(arr, f, opt_obj) {
      var l = arr.length;  // must be fixed during loop... see docs
      var arr2 = goog.isString(arr) ? arr.split('') : arr;
      for (var i = 0; i < l; i++) {
        if (i in arr2 && f.call(/** @type {?} */ (opt_obj), arr2[i], i, arr)) {
          return true;
        }
      }
      return false;
    };


/**
 * Call f for each element of an array. If all calls return true, every()
 * returns true. If any call returns false, every() returns false and
 * does not continue to check the remaining elements.
 *
 * See {@link http://tinyurl.com/developer-mozilla-org-array-every}
 *
 * @param {IArrayLike<T>|string} arr Array or array
 *     like object over which to iterate.
 * @param {?function(this:S, T, number, ?) : boolean} f The function to call for
 *     for every element. This function takes 3 arguments (the element, the
 *     index and the array) and should return a boolean.
 * @param {S=} opt_obj The object to be used as the value of 'this'
 *     within f.
 * @return {boolean} false if any element fails the test.
 * @template T,S
 */
goog.array.every = goog.NATIVE_ARRAY_PROTOTYPES &&
        (goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.every) ?
    function(arr, f, opt_obj) {
      goog.asserts.assert(arr.length != null);

      return Array.prototype.every.call(arr, f, opt_obj);
    } :
    function(arr, f, opt_obj) {
      var l = arr.length;  // must be fixed during loop... see docs
      var arr2 = goog.isString(arr) ? arr.split('') : arr;
      for (var i = 0; i < l; i++) {
        if (i in arr2 && !f.call(/** @type {?} */ (opt_obj), arr2[i], i, arr)) {
          return false;
        }
      }
      return true;
    };


/**
 * Counts the array elements that fulfill the predicate, i.e. for which the
 * callback function returns true. Skips holes in the array.
 *
 * @param {!IArrayLike<T>|string} arr Array or array like object
 *     over which to iterate.
 * @param {function(this: S, T, number, ?): boolean} f The function to call for
 *     every element. Takes 3 arguments (the element, the index and the array).
 * @param {S=} opt_obj The object to be used as the value of 'this' within f.
 * @return {number} The number of the matching elements.
 * @template T,S
 */
goog.array.count = function(arr, f, opt_obj) {
  var count = 0;
  goog.array.forEach(arr, function(element, index, arr) {
    if (f.call(/** @type {?} */ (opt_obj), element, index, arr)) {
      ++count;
    }
  }, opt_obj);
  return count;
};


/**
 * Search an array for the first element that satisfies a given condition and
 * return that element.
 * @param {IArrayLike<T>|string} arr Array or array
 *     like object over which to iterate.
 * @param {?function(this:S, T, number, ?) : boolean} f The function to call
 *     for every element. This function takes 3 arguments (the element, the
 *     index and the array) and should return a boolean.
 * @param {S=} opt_obj An optional "this" context for the function.
 * @return {T|null} The first array element that passes the test, or null if no
 *     element is found.
 * @template T,S
 */
goog.array.find = function(arr, f, opt_obj) {
  var i = goog.array.findIndex(arr, f, opt_obj);
  return i < 0 ? null : goog.isString(arr) ? arr.charAt(i) : arr[i];
};


/**
 * Search an array for the first element that satisfies a given condition and
 * return its index.
 * @param {IArrayLike<T>|string} arr Array or array
 *     like object over which to iterate.
 * @param {?function(this:S, T, number, ?) : boolean} f The function to call for
 *     every element. This function
 *     takes 3 arguments (the element, the index and the array) and should
 *     return a boolean.
 * @param {S=} opt_obj An optional "this" context for the function.
 * @return {number} The index of the first array element that passes the test,
 *     or -1 if no element is found.
 * @template T,S
 */
goog.array.findIndex = function(arr, f, opt_obj) {
  var l = arr.length;  // must be fixed during loop... see docs
  var arr2 = goog.isString(arr) ? arr.split('') : arr;
  for (var i = 0; i < l; i++) {
    if (i in arr2 && f.call(/** @type {?} */ (opt_obj), arr2[i], i, arr)) {
      return i;
    }
  }
  return -1;
};


/**
 * Search an array (in reverse order) for the last element that satisfies a
 * given condition and return that element.
 * @param {IArrayLike<T>|string} arr Array or array
 *     like object over which to iterate.
 * @param {?function(this:S, T, number, ?) : boolean} f The function to call
 *     for every element. This function
 *     takes 3 arguments (the element, the index and the array) and should
 *     return a boolean.
 * @param {S=} opt_obj An optional "this" context for the function.
 * @return {T|null} The last array element that passes the test, or null if no
 *     element is found.
 * @template T,S
 */
goog.array.findRight = function(arr, f, opt_obj) {
  var i = goog.array.findIndexRight(arr, f, opt_obj);
  return i < 0 ? null : goog.isString(arr) ? arr.charAt(i) : arr[i];
};


/**
 * Search an array (in reverse order) for the last element that satisfies a
 * given condition and return its index.
 * @param {IArrayLike<T>|string} arr Array or array
 *     like object over which to iterate.
 * @param {?function(this:S, T, number, ?) : boolean} f The function to call
 *     for every element. This function
 *     takes 3 arguments (the element, the index and the array) and should
 *     return a boolean.
 * @param {S=} opt_obj An optional "this" context for the function.
 * @return {number} The index of the last array element that passes the test,
 *     or -1 if no element is found.
 * @template T,S
 */
goog.array.findIndexRight = function(arr, f, opt_obj) {
  var l = arr.length;  // must be fixed during loop... see docs
  var arr2 = goog.isString(arr) ? arr.split('') : arr;
  for (var i = l - 1; i >= 0; i--) {
    if (i in arr2 && f.call(/** @type {?} */ (opt_obj), arr2[i], i, arr)) {
      return i;
    }
  }
  return -1;
};


/**
 * Whether the array contains the given object.
 * @param {IArrayLike<?>|string} arr The array to test for the presence of the
 *     element.
 * @param {*} obj The object for which to test.
 * @return {boolean} true if obj is present.
 */
goog.array.contains = function(arr, obj) {
  return goog.array.indexOf(arr, obj) >= 0;
};


/**
 * Whether the array is empty.
 * @param {IArrayLike<?>|string} arr The array to test.
 * @return {boolean} true if empty.
 */
goog.array.isEmpty = function(arr) {
  return arr.length == 0;
};


/**
 * Clears the array.
 * @param {IArrayLike<?>} arr Array or array like object to clear.
 */
goog.array.clear = function(arr) {
  // For non real arrays we don't have the magic length so we delete the
  // indices.
  if (!goog.isArray(arr)) {
    for (var i = arr.length - 1; i >= 0; i--) {
      delete arr[i];
    }
  }
  arr.length = 0;
};


/**
 * Pushes an item into an array, if it's not already in the array.
 * @param {Array<T>} arr Array into which to insert the item.
 * @param {T} obj Value to add.
 * @template T
 */
goog.array.insert = function(arr, obj) {
  if (!goog.array.contains(arr, obj)) {
    arr.push(obj);
  }
};


/**
 * Inserts an object at the given index of the array.
 * @param {IArrayLike<?>} arr The array to modify.
 * @param {*} obj The object to insert.
 * @param {number=} opt_i The index at which to insert the object. If omitted,
 *      treated as 0. A negative index is counted from the end of the array.
 */
goog.array.insertAt = function(arr, obj, opt_i) {
  goog.array.splice(arr, opt_i, 0, obj);
};


/**
 * Inserts at the given index of the array, all elements of another array.
 * @param {IArrayLike<?>} arr The array to modify.
 * @param {IArrayLike<?>} elementsToAdd The array of elements to add.
 * @param {number=} opt_i The index at which to insert the object. If omitted,
 *      treated as 0. A negative index is counted from the end of the array.
 */
goog.array.insertArrayAt = function(arr, elementsToAdd, opt_i) {
  goog.partial(goog.array.splice, arr, opt_i, 0).apply(null, elementsToAdd);
};


/**
 * Inserts an object into an array before a specified object.
 * @param {Array<T>} arr The array to modify.
 * @param {T} obj The object to insert.
 * @param {T=} opt_obj2 The object before which obj should be inserted. If obj2
 *     is omitted or not found, obj is inserted at the end of the array.
 * @template T
 */
goog.array.insertBefore = function(arr, obj, opt_obj2) {
  var i;
  if (arguments.length == 2 || (i = goog.array.indexOf(arr, opt_obj2)) < 0) {
    arr.push(obj);
  } else {
    goog.array.insertAt(arr, obj, i);
  }
};


/**
 * Removes the first occurrence of a particular value from an array.
 * @param {IArrayLike<T>} arr Array from which to remove
 *     value.
 * @param {T} obj Object to remove.
 * @return {boolean} True if an element was removed.
 * @template T
 */
goog.array.remove = function(arr, obj) {
  var i = goog.array.indexOf(arr, obj);
  var rv;
  if ((rv = i >= 0)) {
    goog.array.removeAt(arr, i);
  }
  return rv;
};


/**
 * Removes the last occurrence of a particular value from an array.
 * @param {!IArrayLike<T>} arr Array from which to remove value.
 * @param {T} obj Object to remove.
 * @return {boolean} True if an element was removed.
 * @template T
 */
goog.array.removeLast = function(arr, obj) {
  var i = goog.array.lastIndexOf(arr, obj);
  if (i >= 0) {
    goog.array.removeAt(arr, i);
    return true;
  }
  return false;
};


/**
 * Removes from an array the element at index i
 * @param {IArrayLike<?>} arr Array or array like object from which to
 *     remove value.
 * @param {number} i The index to remove.
 * @return {boolean} True if an element was removed.
 */
goog.array.removeAt = function(arr, i) {
  goog.asserts.assert(arr.length != null);

  // use generic form of splice
  // splice returns the removed items and if successful the length of that
  // will be 1
  return Array.prototype.splice.call(arr, i, 1).length == 1;
};


/**
 * Removes the first value that satisfies the given condition.
 * @param {IArrayLike<T>} arr Array or array
 *     like object over which to iterate.
 * @param {?function(this:S, T, number, ?) : boolean} f The function to call
 *     for every element. This function
 *     takes 3 arguments (the element, the index and the array) and should
 *     return a boolean.
 * @param {S=} opt_obj An optional "this" context for the function.
 * @return {boolean} True if an element was removed.
 * @template T,S
 */
goog.array.removeIf = function(arr, f, opt_obj) {
  var i = goog.array.findIndex(arr, f, opt_obj);
  if (i >= 0) {
    goog.array.removeAt(arr, i);
    return true;
  }
  return false;
};


/**
 * Removes all values that satisfy the given condition.
 * @param {IArrayLike<T>} arr Array or array
 *     like object over which to iterate.
 * @param {?function(this:S, T, number, ?) : boolean} f The function to call
 *     for every element. This function
 *     takes 3 arguments (the element, the index and the array) and should
 *     return a boolean.
 * @param {S=} opt_obj An optional "this" context for the function.
 * @return {number} The number of items removed
 * @template T,S
 */
goog.array.removeAllIf = function(arr, f, opt_obj) {
  var removedCount = 0;
  goog.array.forEachRight(arr, function(val, index) {
    if (f.call(/** @type {?} */ (opt_obj), val, index, arr)) {
      if (goog.array.removeAt(arr, index)) {
        removedCount++;
      }
    }
  });
  return removedCount;
};


/**
 * Returns a new array that is the result of joining the arguments.  If arrays
 * are passed then their items are added, however, if non-arrays are passed they
 * will be added to the return array as is.
 *
 * Note that ArrayLike objects will be added as is, rather than having their
 * items added.
 *
 * goog.array.concat([1, 2], [3, 4]) -> [1, 2, 3, 4]
 * goog.array.concat(0, [1, 2]) -> [0, 1, 2]
 * goog.array.concat([1, 2], null) -> [1, 2, null]
 *
 * There is bug in all current versions of IE (6, 7 and 8) where arrays created
 * in an iframe become corrupted soon (not immediately) after the iframe is
 * destroyed. This is common if loading data via goog.net.IframeIo, for example.
 * This corruption only affects the concat method which will start throwing
 * Catastrophic Errors (#-2147418113).
 *
 * See http://endoflow.com/scratch/corrupted-arrays.html for a test case.
 *
 * Internally goog.array should use this, so that all methods will continue to
 * work on these broken array objects.
 *
 * @param {...*} var_args Items to concatenate.  Arrays will have each item
 *     added, while primitives and objects will be added as is.
 * @return {!Array<?>} The new resultant array.
 */
goog.array.concat = function(var_args) {
  return Array.prototype.concat.apply(Array.prototype, arguments);
};


/**
 * Returns a new array that contains the contents of all the arrays passed.
 * @param {...!Array<T>} var_args
 * @return {!Array<T>}
 * @template T
 */
goog.array.join = function(var_args) {
  return Array.prototype.concat.apply(Array.prototype, arguments);
};


/**
 * Converts an object to an array.
 * @param {IArrayLike<T>|string} object  The object to convert to an
 *     array.
 * @return {!Array<T>} The object converted into an array. If object has a
 *     length property, every property indexed with a non-negative number
 *     less than length will be included in the result. If object does not
 *     have a length property, an empty array will be returned.
 * @template T
 */
goog.array.toArray = function(object) {
  var length = object.length;

  // If length is not a number the following it false. This case is kept for
  // backwards compatibility since there are callers that pass objects that are
  // not array like.
  if (length > 0) {
    var rv = new Array(length);
    for (var i = 0; i < length; i++) {
      rv[i] = object[i];
    }
    return rv;
  }
  return [];
};


/**
 * Does a shallow copy of an array.
 * @param {IArrayLike<T>|string} arr  Array or array-like object to
 *     clone.
 * @return {!Array<T>} Clone of the input array.
 * @template T
 */
goog.array.clone = goog.array.toArray;


/**
 * Extends an array with another array, element, or "array like" object.
 * This function operates 'in-place', it does not create a new Array.
 *
 * Example:
 * var a = [];
 * goog.array.extend(a, [0, 1]);
 * a; // [0, 1]
 * goog.array.extend(a, 2);
 * a; // [0, 1, 2]
 *
 * @param {Array<VALUE>} arr1  The array to modify.
 * @param {...(Array<VALUE>|VALUE)} var_args The elements or arrays of elements
 *     to add to arr1.
 * @template VALUE
 */
goog.array.extend = function(arr1, var_args) {
  for (var i = 1; i < arguments.length; i++) {
    var arr2 = arguments[i];
    if (goog.isArrayLike(arr2)) {
      var len1 = arr1.length || 0;
      var len2 = arr2.length || 0;
      arr1.length = len1 + len2;
      for (var j = 0; j < len2; j++) {
        arr1[len1 + j] = arr2[j];
      }
    } else {
      arr1.push(arr2);
    }
  }
};


/**
 * Adds or removes elements from an array. This is a generic version of Array
 * splice. This means that it might work on other objects similar to arrays,
 * such as the arguments object.
 *
 * @param {IArrayLike<T>} arr The array to modify.
 * @param {number|undefined} index The index at which to start changing the
 *     array. If not defined, treated as 0.
 * @param {number} howMany How many elements to remove (0 means no removal. A
 *     value below 0 is treated as zero and so is any other non number. Numbers
 *     are floored).
 * @param {...T} var_args Optional, additional elements to insert into the
 *     array.
 * @return {!Array<T>} the removed elements.
 * @template T
 */
goog.array.splice = function(arr, index, howMany, var_args) {
  goog.asserts.assert(arr.length != null);

  return Array.prototype.splice.apply(arr, goog.array.slice(arguments, 1));
};


/**
 * Returns a new array from a segment of an array. This is a generic version of
 * Array slice. This means that it might work on other objects similar to
 * arrays, such as the arguments object.
 *
 * @param {IArrayLike<T>|string} arr The array from
 * which to copy a segment.
 * @param {number} start The index of the first element to copy.
 * @param {number=} opt_end The index after the last element to copy.
 * @return {!Array<T>} A new array containing the specified segment of the
 *     original array.
 * @template T
 */
goog.array.slice = function(arr, start, opt_end) {
  goog.asserts.assert(arr.length != null);

  // passing 1 arg to slice is not the same as passing 2 where the second is
  // null or undefined (in that case the second argument is treated as 0).
  // we could use slice on the arguments object and then use apply instead of
  // testing the length
  if (arguments.length <= 2) {
    return Array.prototype.slice.call(arr, start);
  } else {
    return Array.prototype.slice.call(arr, start, opt_end);
  }
};


/**
 * Removes all duplicates from an array (retaining only the first
 * occurrence of each array element).  This function modifies the
 * array in place and doesn't change the order of the non-duplicate items.
 *
 * For objects, duplicates are identified as having the same unique ID as
 * defined by {@link goog.getUid}.
 *
 * Alternatively you can specify a custom hash function that returns a unique
 * value for each item in the array it should consider unique.
 *
 * Runtime: N,
 * Worstcase space: 2N (no dupes)
 *
 * @param {IArrayLike<T>} arr The array from which to remove
 *     duplicates.
 * @param {Array=} opt_rv An optional array in which to return the results,
 *     instead of performing the removal inplace.  If specified, the original
 *     array will remain unchanged.
 * @param {function(T):string=} opt_hashFn An optional function to use to
 *     apply to every item in the array. This function should return a unique
 *     value for each item in the array it should consider unique.
 * @template T
 */
goog.array.removeDuplicates = function(arr, opt_rv, opt_hashFn) {
  var returnArray = opt_rv || arr;
  var defaultHashFn = function(item) {
    // Prefix each type with a single character representing the type to
    // prevent conflicting keys (e.g. true and 'true').
    return goog.isObject(item) ? 'o' + goog.getUid(item) :
                                 (typeof item).charAt(0) + item;
  };
  var hashFn = opt_hashFn || defaultHashFn;

  var seen = {}, cursorInsert = 0, cursorRead = 0;
  while (cursorRead < arr.length) {
    var current = arr[cursorRead++];
    var key = hashFn(current);
    if (!Object.prototype.hasOwnProperty.call(seen, key)) {
      seen[key] = true;
      returnArray[cursorInsert++] = current;
    }
  }
  returnArray.length = cursorInsert;
};


/**
 * Searches the specified array for the specified target using the binary
 * search algorithm.  If no opt_compareFn is specified, elements are compared
 * using <code>goog.array.defaultCompare</code>, which compares the elements
 * using the built in < and > operators.  This will produce the expected
 * behavior for homogeneous arrays of String(s) and Number(s). The array
 * specified <b>must</b> be sorted in ascending order (as defined by the
 * comparison function).  If the array is not sorted, results are undefined.
 * If the array contains multiple instances of the specified target value, any
 * of these instances may be found.
 *
 * Runtime: O(log n)
 *
 * @param {IArrayLike<VALUE>} arr The array to be searched.
 * @param {TARGET} target The sought value.
 * @param {function(TARGET, VALUE): number=} opt_compareFn Optional comparison
 *     function by which the array is ordered. Should take 2 arguments to
 *     compare, and return a negative number, zero, or a positive number
 *     depending on whether the first argument is less than, equal to, or
 *     greater than the second.
 * @return {number} Lowest index of the target value if found, otherwise
 *     (-(insertion point) - 1). The insertion point is where the value should
 *     be inserted into arr to preserve the sorted property.  Return value >= 0
 *     iff target is found.
 * @template TARGET, VALUE
 */
goog.array.binarySearch = function(arr, target, opt_compareFn) {
  return goog.array.binarySearch_(
      arr, opt_compareFn || goog.array.defaultCompare, false /* isEvaluator */,
      target);
};


/**
 * Selects an index in the specified array using the binary search algorithm.
 * The evaluator receives an element and determines whether the desired index
 * is before, at, or after it.  The evaluator must be consistent (formally,
 * goog.array.map(goog.array.map(arr, evaluator, opt_obj), goog.math.sign)
 * must be monotonically non-increasing).
 *
 * Runtime: O(log n)
 *
 * @param {IArrayLike<VALUE>} arr The array to be searched.
 * @param {function(this:THIS, VALUE, number, ?): number} evaluator
 *     Evaluator function that receives 3 arguments (the element, the index and
 *     the array). Should return a negative number, zero, or a positive number
 *     depending on whether the desired index is before, at, or after the
 *     element passed to it.
 * @param {THIS=} opt_obj The object to be used as the value of 'this'
 *     within evaluator.
 * @return {number} Index of the leftmost element matched by the evaluator, if
 *     such exists; otherwise (-(insertion point) - 1). The insertion point is
 *     the index of the first element for which the evaluator returns negative,
 *     or arr.length if no such element exists. The return value is non-negative
 *     iff a match is found.
 * @template THIS, VALUE
 */
goog.array.binarySelect = function(arr, evaluator, opt_obj) {
  return goog.array.binarySearch_(
      arr, evaluator, true /* isEvaluator */, undefined /* opt_target */,
      opt_obj);
};


/**
 * Implementation of a binary search algorithm which knows how to use both
 * comparison functions and evaluators. If an evaluator is provided, will call
 * the evaluator with the given optional data object, conforming to the
 * interface defined in binarySelect. Otherwise, if a comparison function is
 * provided, will call the comparison function against the given data object.
 *
 * This implementation purposefully does not use goog.bind or goog.partial for
 * performance reasons.
 *
 * Runtime: O(log n)
 *
 * @param {IArrayLike<?>} arr The array to be searched.
 * @param {function(?, ?, ?): number | function(?, ?): number} compareFn
 *     Either an evaluator or a comparison function, as defined by binarySearch
 *     and binarySelect above.
 * @param {boolean} isEvaluator Whether the function is an evaluator or a
 *     comparison function.
 * @param {?=} opt_target If the function is a comparison function, then
 *     this is the target to binary search for.
 * @param {Object=} opt_selfObj If the function is an evaluator, this is an
 *     optional this object for the evaluator.
 * @return {number} Lowest index of the target value if found, otherwise
 *     (-(insertion point) - 1). The insertion point is where the value should
 *     be inserted into arr to preserve the sorted property.  Return value >= 0
 *     iff target is found.
 * @private
 */
goog.array.binarySearch_ = function(
    arr, compareFn, isEvaluator, opt_target, opt_selfObj) {
  var left = 0;            // inclusive
  var right = arr.length;  // exclusive
  var found;
  while (left < right) {
    var middle = (left + right) >> 1;
    var compareResult;
    if (isEvaluator) {
      compareResult = compareFn.call(opt_selfObj, arr[middle], middle, arr);
    } else {
      // NOTE(dimvar): To avoid this cast, we'd have to use function overloading
      // for the type of binarySearch_, which the type system can't express yet.
      compareResult = /** @type {function(?, ?): number} */ (compareFn)(
          opt_target, arr[middle]);
    }
    if (compareResult > 0) {
      left = middle + 1;
    } else {
      right = middle;
      // We are looking for the lowest index so we can't return immediately.
      found = !compareResult;
    }
  }
  // left is the index if found, or the insertion point otherwise.
  // ~left is a shorthand for -left - 1.
  return found ? left : ~left;
};


/**
 * Sorts the specified array into ascending order.  If no opt_compareFn is
 * specified, elements are compared using
 * <code>goog.array.defaultCompare</code>, which compares the elements using
 * the built in < and > operators.  This will produce the expected behavior
 * for homogeneous arrays of String(s) and Number(s), unlike the native sort,
 * but will give unpredictable results for heterogeneous lists of strings and
 * numbers with different numbers of digits.
 *
 * This sort is not guaranteed to be stable.
 *
 * Runtime: Same as <code>Array.prototype.sort</code>
 *
 * @param {Array<T>} arr The array to be sorted.
 * @param {?function(T,T):number=} opt_compareFn Optional comparison
 *     function by which the
 *     array is to be ordered. Should take 2 arguments to compare, and return a
 *     negative number, zero, or a positive number depending on whether the
 *     first argument is less than, equal to, or greater than the second.
 * @template T
 */
goog.array.sort = function(arr, opt_compareFn) {
  // TODO(arv): Update type annotation since null is not accepted.
  arr.sort(opt_compareFn || goog.array.defaultCompare);
};


/**
 * Sorts the specified array into ascending order in a stable way.  If no
 * opt_compareFn is specified, elements are compared using
 * <code>goog.array.defaultCompare</code>, which compares the elements using
 * the built in < and > operators.  This will produce the expected behavior
 * for homogeneous arrays of String(s) and Number(s).
 *
 * Runtime: Same as <code>Array.prototype.sort</code>, plus an additional
 * O(n) overhead of copying the array twice.
 *
 * @param {Array<T>} arr The array to be sorted.
 * @param {?function(T, T): number=} opt_compareFn Optional comparison function
 *     by which the array is to be ordered. Should take 2 arguments to compare,
 *     and return a negative number, zero, or a positive number depending on
 *     whether the first argument is less than, equal to, or greater than the
 *     second.
 * @template T
 */
goog.array.stableSort = function(arr, opt_compareFn) {
  var compArr = new Array(arr.length);
  for (var i = 0; i < arr.length; i++) {
    compArr[i] = {index: i, value: arr[i]};
  }
  var valueCompareFn = opt_compareFn || goog.array.defaultCompare;
  function stableCompareFn(obj1, obj2) {
    return valueCompareFn(obj1.value, obj2.value) || obj1.index - obj2.index;
  }
  goog.array.sort(compArr, stableCompareFn);
  for (var i = 0; i < arr.length; i++) {
    arr[i] = compArr[i].value;
  }
};


/**
 * Sort the specified array into ascending order based on item keys
 * returned by the specified key function.
 * If no opt_compareFn is specified, the keys are compared in ascending order
 * using <code>goog.array.defaultCompare</code>.
 *
 * Runtime: O(S(f(n)), where S is runtime of <code>goog.array.sort</code>
 * and f(n) is runtime of the key function.
 *
 * @param {Array<T>} arr The array to be sorted.
 * @param {function(T): K} keyFn Function taking array element and returning
 *     a key used for sorting this element.
 * @param {?function(K, K): number=} opt_compareFn Optional comparison function
 *     by which the keys are to be ordered. Should take 2 arguments to compare,
 *     and return a negative number, zero, or a positive number depending on
 *     whether the first argument is less than, equal to, or greater than the
 *     second.
 * @template T,K
 */
goog.array.sortByKey = function(arr, keyFn, opt_compareFn) {
  var keyCompareFn = opt_compareFn || goog.array.defaultCompare;
  goog.array.sort(
      arr, function(a, b) { return keyCompareFn(keyFn(a), keyFn(b)); });
};


/**
 * Sorts an array of objects by the specified object key and compare
 * function. If no compare function is provided, the key values are
 * compared in ascending order using <code>goog.array.defaultCompare</code>.
 * This won't work for keys that get renamed by the compiler. So use
 * {'foo': 1, 'bar': 2} rather than {foo: 1, bar: 2}.
 * @param {Array<Object>} arr An array of objects to sort.
 * @param {string} key The object key to sort by.
 * @param {Function=} opt_compareFn The function to use to compare key
 *     values.
 */
goog.array.sortObjectsByKey = function(arr, key, opt_compareFn) {
  goog.array.sortByKey(arr, function(obj) { return obj[key]; }, opt_compareFn);
};


/**
 * Tells if the array is sorted.
 * @param {!Array<T>} arr The array.
 * @param {?function(T,T):number=} opt_compareFn Function to compare the
 *     array elements.
 *     Should take 2 arguments to compare, and return a negative number, zero,
 *     or a positive number depending on whether the first argument is less
 *     than, equal to, or greater than the second.
 * @param {boolean=} opt_strict If true no equal elements are allowed.
 * @return {boolean} Whether the array is sorted.
 * @template T
 */
goog.array.isSorted = function(arr, opt_compareFn, opt_strict) {
  var compare = opt_compareFn || goog.array.defaultCompare;
  for (var i = 1; i < arr.length; i++) {
    var compareResult = compare(arr[i - 1], arr[i]);
    if (compareResult > 0 || compareResult == 0 && opt_strict) {
      return false;
    }
  }
  return true;
};


/**
 * Compares two arrays for equality. Two arrays are considered equal if they
 * have the same length and their corresponding elements are equal according to
 * the comparison function.
 *
 * @param {IArrayLike<?>} arr1 The first array to compare.
 * @param {IArrayLike<?>} arr2 The second array to compare.
 * @param {Function=} opt_equalsFn Optional comparison function.
 *     Should take 2 arguments to compare, and return true if the arguments
 *     are equal. Defaults to {@link goog.array.defaultCompareEquality} which
 *     compares the elements using the built-in '===' operator.
 * @return {boolean} Whether the two arrays are equal.
 */
goog.array.equals = function(arr1, arr2, opt_equalsFn) {
  if (!goog.isArrayLike(arr1) || !goog.isArrayLike(arr2) ||
      arr1.length != arr2.length) {
    return false;
  }
  var l = arr1.length;
  var equalsFn = opt_equalsFn || goog.array.defaultCompareEquality;
  for (var i = 0; i < l; i++) {
    if (!equalsFn(arr1[i], arr2[i])) {
      return false;
    }
  }
  return true;
};


/**
 * 3-way array compare function.
 * @param {!IArrayLike<VALUE>} arr1 The first array to
 *     compare.
 * @param {!IArrayLike<VALUE>} arr2 The second array to
 *     compare.
 * @param {function(VALUE, VALUE): number=} opt_compareFn Optional comparison
 *     function by which the array is to be ordered. Should take 2 arguments to
 *     compare, and return a negative number, zero, or a positive number
 *     depending on whether the first argument is less than, equal to, or
 *     greater than the second.
 * @return {number} Negative number, zero, or a positive number depending on
 *     whether the first argument is less than, equal to, or greater than the
 *     second.
 * @template VALUE
 */
goog.array.compare3 = function(arr1, arr2, opt_compareFn) {
  var compare = opt_compareFn || goog.array.defaultCompare;
  var l = Math.min(arr1.length, arr2.length);
  for (var i = 0; i < l; i++) {
    var result = compare(arr1[i], arr2[i]);
    if (result != 0) {
      return result;
    }
  }
  return goog.array.defaultCompare(arr1.length, arr2.length);
};


/**
 * Compares its two arguments for order, using the built in < and >
 * operators.
 * @param {VALUE} a The first object to be compared.
 * @param {VALUE} b The second object to be compared.
 * @return {number} A negative number, zero, or a positive number as the first
 *     argument is less than, equal to, or greater than the second,
 *     respectively.
 * @template VALUE
 */
goog.array.defaultCompare = function(a, b) {
  return a > b ? 1 : a < b ? -1 : 0;
};


/**
 * Compares its two arguments for inverse order, using the built in < and >
 * operators.
 * @param {VALUE} a The first object to be compared.
 * @param {VALUE} b The second object to be compared.
 * @return {number} A negative number, zero, or a positive number as the first
 *     argument is greater than, equal to, or less than the second,
 *     respectively.
 * @template VALUE
 */
goog.array.inverseDefaultCompare = function(a, b) {
  return -goog.array.defaultCompare(a, b);
};


/**
 * Compares its two arguments for equality, using the built in === operator.
 * @param {*} a The first object to compare.
 * @param {*} b The second object to compare.
 * @return {boolean} True if the two arguments are equal, false otherwise.
 */
goog.array.defaultCompareEquality = function(a, b) {
  return a === b;
};


/**
 * Inserts a value into a sorted array. The array is not modified if the
 * value is already present.
 * @param {IArrayLike<VALUE>} array The array to modify.
 * @param {VALUE} value The object to insert.
 * @param {function(VALUE, VALUE): number=} opt_compareFn Optional comparison
 *     function by which the array is ordered. Should take 2 arguments to
 *     compare, and return a negative number, zero, or a positive number
 *     depending on whether the first argument is less than, equal to, or
 *     greater than the second.
 * @return {boolean} True if an element was inserted.
 * @template VALUE
 */
goog.array.binaryInsert = function(array, value, opt_compareFn) {
  var index = goog.array.binarySearch(array, value, opt_compareFn);
  if (index < 0) {
    goog.array.insertAt(array, value, -(index + 1));
    return true;
  }
  return false;
};


/**
 * Removes a value from a sorted array.
 * @param {!IArrayLike<VALUE>} array The array to modify.
 * @param {VALUE} value The object to remove.
 * @param {function(VALUE, VALUE): number=} opt_compareFn Optional comparison
 *     function by which the array is ordered. Should take 2 arguments to
 *     compare, and return a negative number, zero, or a positive number
 *     depending on whether the first argument is less than, equal to, or
 *     greater than the second.
 * @return {boolean} True if an element was removed.
 * @template VALUE
 */
goog.array.binaryRemove = function(array, value, opt_compareFn) {
  var index = goog.array.binarySearch(array, value, opt_compareFn);
  return (index >= 0) ? goog.array.removeAt(array, index) : false;
};


/**
 * Splits an array into disjoint buckets according to a splitting function.
 * @param {Array<T>} array The array.
 * @param {function(this:S, T,number,Array<T>):?} sorter Function to call for
 *     every element.  This takes 3 arguments (the element, the index and the
 *     array) and must return a valid object key (a string, number, etc), or
 *     undefined, if that object should not be placed in a bucket.
 * @param {S=} opt_obj The object to be used as the value of 'this' within
 *     sorter.
 * @return {!Object} An object, with keys being all of the unique return values
 *     of sorter, and values being arrays containing the items for
 *     which the splitter returned that key.
 * @template T,S
 */
goog.array.bucket = function(array, sorter, opt_obj) {
  var buckets = {};

  for (var i = 0; i < array.length; i++) {
    var value = array[i];
    var key = sorter.call(/** @type {?} */ (opt_obj), value, i, array);
    if (goog.isDef(key)) {
      // Push the value to the right bucket, creating it if necessary.
      var bucket = buckets[key] || (buckets[key] = []);
      bucket.push(value);
    }
  }

  return buckets;
};


/**
 * Creates a new object built from the provided array and the key-generation
 * function.
 * @param {IArrayLike<T>} arr Array or array like object over
 *     which to iterate whose elements will be the values in the new object.
 * @param {?function(this:S, T, number, ?) : string} keyFunc The function to
 *     call for every element. This function takes 3 arguments (the element, the
 *     index and the array) and should return a string that will be used as the
 *     key for the element in the new object. If the function returns the same
 *     key for more than one element, the value for that key is
 *     implementation-defined.
 * @param {S=} opt_obj The object to be used as the value of 'this'
 *     within keyFunc.
 * @return {!Object<T>} The new object.
 * @template T,S
 */
goog.array.toObject = function(arr, keyFunc, opt_obj) {
  var ret = {};
  goog.array.forEach(arr, function(element, index) {
    ret[keyFunc.call(/** @type {?} */ (opt_obj), element, index, arr)] =
        element;
  });
  return ret;
};


/**
 * Creates a range of numbers in an arithmetic progression.
 *
 * Range takes 1, 2, or 3 arguments:
 * <pre>
 * range(5) is the same as range(0, 5, 1) and produces [0, 1, 2, 3, 4]
 * range(2, 5) is the same as range(2, 5, 1) and produces [2, 3, 4]
 * range(-2, -5, -1) produces [-2, -3, -4]
 * range(-2, -5, 1) produces [], since stepping by 1 wouldn't ever reach -5.
 * </pre>
 *
 * @param {number} startOrEnd The starting value of the range if an end argument
 *     is provided. Otherwise, the start value is 0, and this is the end value.
 * @param {number=} opt_end The optional end value of the range.
 * @param {number=} opt_step The step size between range values. Defaults to 1
 *     if opt_step is undefined or 0.
 * @return {!Array<number>} An array of numbers for the requested range. May be
 *     an empty array if adding the step would not converge toward the end
 *     value.
 */
goog.array.range = function(startOrEnd, opt_end, opt_step) {
  var array = [];
  var start = 0;
  var end = startOrEnd;
  var step = opt_step || 1;
  if (opt_end !== undefined) {
    start = startOrEnd;
    end = opt_end;
  }

  if (step * (end - start) < 0) {
    // Sign mismatch: start + step will never reach the end value.
    return [];
  }

  if (step > 0) {
    for (var i = start; i < end; i += step) {
      array.push(i);
    }
  } else {
    for (var i = start; i > end; i += step) {
      array.push(i);
    }
  }
  return array;
};


/**
 * Returns an array consisting of the given value repeated N times.
 *
 * @param {VALUE} value The value to repeat.
 * @param {number} n The repeat count.
 * @return {!Array<VALUE>} An array with the repeated value.
 * @template VALUE
 */
goog.array.repeat = function(value, n) {
  var array = [];
  for (var i = 0; i < n; i++) {
    array[i] = value;
  }
  return array;
};


/**
 * Returns an array consisting of every argument with all arrays
 * expanded in-place recursively.
 *
 * @param {...*} var_args The values to flatten.
 * @return {!Array<?>} An array containing the flattened values.
 */
goog.array.flatten = function(var_args) {
  var CHUNK_SIZE = 8192;

  var result = [];
  for (var i = 0; i < arguments.length; i++) {
    var element = arguments[i];
    if (goog.isArray(element)) {
      for (var c = 0; c < element.length; c += CHUNK_SIZE) {
        var chunk = goog.array.slice(element, c, c + CHUNK_SIZE);
        var recurseResult = goog.array.flatten.apply(null, chunk);
        for (var r = 0; r < recurseResult.length; r++) {
          result.push(recurseResult[r]);
        }
      }
    } else {
      result.push(element);
    }
  }
  return result;
};


/**
 * Rotates an array in-place. After calling this method, the element at
 * index i will be the element previously at index (i - n) %
 * array.length, for all values of i between 0 and array.length - 1,
 * inclusive.
 *
 * For example, suppose list comprises [t, a, n, k, s]. After invoking
 * rotate(array, 1) (or rotate(array, -4)), array will comprise [s, t, a, n, k].
 *
 * @param {!Array<T>} array The array to rotate.
 * @param {number} n The amount to rotate.
 * @return {!Array<T>} The array.
 * @template T
 */
goog.array.rotate = function(array, n) {
  goog.asserts.assert(array.length != null);

  if (array.length) {
    n %= array.length;
    if (n > 0) {
      Array.prototype.unshift.apply(array, array.splice(-n, n));
    } else if (n < 0) {
      Array.prototype.push.apply(array, array.splice(0, -n));
    }
  }
  return array;
};


/**
 * Moves one item of an array to a new position keeping the order of the rest
 * of the items. Example use case: keeping a list of JavaScript objects
 * synchronized with the corresponding list of DOM elements after one of the
 * elements has been dragged to a new position.
 * @param {!IArrayLike<?>} arr The array to modify.
 * @param {number} fromIndex Index of the item to move between 0 and
 *     {@code arr.length - 1}.
 * @param {number} toIndex Target index between 0 and {@code arr.length - 1}.
 */
goog.array.moveItem = function(arr, fromIndex, toIndex) {
  goog.asserts.assert(fromIndex >= 0 && fromIndex < arr.length);
  goog.asserts.assert(toIndex >= 0 && toIndex < arr.length);
  // Remove 1 item at fromIndex.
  var removedItems = Array.prototype.splice.call(arr, fromIndex, 1);
  // Insert the removed item at toIndex.
  Array.prototype.splice.call(arr, toIndex, 0, removedItems[0]);
  // We don't use goog.array.insertAt and goog.array.removeAt, because they're
  // significantly slower than splice.
};


/**
 * Creates a new array for which the element at position i is an array of the
 * ith element of the provided arrays.  The returned array will only be as long
 * as the shortest array provided; additional values are ignored.  For example,
 * the result of zipping [1, 2] and [3, 4, 5] is [[1,3], [2, 4]].
 *
 * This is similar to the zip() function in Python.  See {@link
 * http://docs.python.org/library/functions.html#zip}
 *
 * @param {...!IArrayLike<?>} var_args Arrays to be combined.
 * @return {!Array<!Array<?>>} A new array of arrays created from
 *     provided arrays.
 */
goog.array.zip = function(var_args) {
  if (!arguments.length) {
    return [];
  }
  var result = [];
  var minLen = arguments[0].length;
  for (var i = 1; i < arguments.length; i++) {
    if (arguments[i].length < minLen) {
      minLen = arguments[i].length;
    }
  }
  for (var i = 0; i < minLen; i++) {
    var value = [];
    for (var j = 0; j < arguments.length; j++) {
      value.push(arguments[j][i]);
    }
    result.push(value);
  }
  return result;
};


/**
 * Shuffles the values in the specified array using the Fisher-Yates in-place
 * shuffle (also known as the Knuth Shuffle). By default, calls Math.random()
 * and so resets the state of that random number generator. Similarly, may reset
 * the state of the any other specified random number generator.
 *
 * Runtime: O(n)
 *
 * @param {!Array<?>} arr The array to be shuffled.
 * @param {function():number=} opt_randFn Optional random function to use for
 *     shuffling.
 *     Takes no arguments, and returns a random number on the interval [0, 1).
 *     Defaults to Math.random() using JavaScript's built-in Math library.
 */
goog.array.shuffle = function(arr, opt_randFn) {
  var randFn = opt_randFn || Math.random;

  for (var i = arr.length - 1; i > 0; i--) {
    // Choose a random array index in [0, i] (inclusive with i).
    var j = Math.floor(randFn() * (i + 1));

    var tmp = arr[i];
    arr[i] = arr[j];
    arr[j] = tmp;
  }
};


/**
 * Returns a new array of elements from arr, based on the indexes of elements
 * provided by index_arr. For example, the result of index copying
 * ['a', 'b', 'c'] with index_arr [1,0,0,2] is ['b', 'a', 'a', 'c'].
 *
 * @param {!Array<T>} arr The array to get a indexed copy from.
 * @param {!Array<number>} index_arr An array of indexes to get from arr.
 * @return {!Array<T>} A new array of elements from arr in index_arr order.
 * @template T
 */
goog.array.copyByIndex = function(arr, index_arr) {
  var result = [];
  goog.array.forEach(index_arr, function(index) { result.push(arr[index]); });
  return result;
};


/**
 * Maps each element of the input array into zero or more elements of the output
 * array.
 *
 * @param {!IArrayLike<VALUE>|string} arr Array or array like object
 *     over which to iterate.
 * @param {function(this:THIS, VALUE, number, ?): !Array<RESULT>} f The function
 *     to call for every element. This function takes 3 arguments (the element,
 *     the index and the array) and should return an array. The result will be
 *     used to extend a new array.
 * @param {THIS=} opt_obj The object to be used as the value of 'this' within f.
 * @return {!Array<RESULT>} a new array with the concatenation of all arrays
 *     returned from f.
 * @template THIS, VALUE, RESULT
 */
goog.array.concatMap = function(arr, f, opt_obj) {
  return goog.array.concat.apply([], goog.array.map(arr, f, opt_obj));
};

// Copyright 2013 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/**
 * @fileoverview Utilities used by goog.labs.userAgent tools. These functions
 * should not be used outside of goog.labs.userAgent.*.
 *
 *
 * @author nnaze@google.com (Nathan Naze)
 */

goog.provide('goog.labs.userAgent.util');

goog.require('goog.string');


/**
 * Gets the native userAgent string from navigator if it exists.
 * If navigator or navigator.userAgent string is missing, returns an empty
 * string.
 * @return {string}
 * @private
 */
goog.labs.userAgent.util.getNativeUserAgentString_ = function() {
  var navigator = goog.labs.userAgent.util.getNavigator_();
  if (navigator) {
    var userAgent = navigator.userAgent;
    if (userAgent) {
      return userAgent;
    }
  }
  return '';
};


/**
 * Getter for the native navigator.
 * This is a separate function so it can be stubbed out in testing.
 * @return {Navigator}
 * @private
 */
goog.labs.userAgent.util.getNavigator_ = function() {
  return goog.global.navigator;
};


/**
 * A possible override for applications which wish to not check
 * navigator.userAgent but use a specified value for detection instead.
 * @private {string}
 */
goog.labs.userAgent.util.userAgent_ =
    goog.labs.userAgent.util.getNativeUserAgentString_();


/**
 * Applications may override browser detection on the built in
 * navigator.userAgent object by setting this string. Set to null to use the
 * browser object instead.
 * @param {?string=} opt_userAgent The User-Agent override.
 */
goog.labs.userAgent.util.setUserAgent = function(opt_userAgent) {
  goog.labs.userAgent.util.userAgent_ =
      opt_userAgent || goog.labs.userAgent.util.getNativeUserAgentString_();
};


/**
 * @return {string} The user agent string.
 */
goog.labs.userAgent.util.getUserAgent = function() {
  return goog.labs.userAgent.util.userAgent_;
};


/**
 * @param {string} str
 * @return {boolean} Whether the user agent contains the given string, ignoring
 *     case.
 */
goog.labs.userAgent.util.matchUserAgent = function(str) {
  var userAgent = goog.labs.userAgent.util.getUserAgent();
  return goog.string.contains(userAgent, str);
};


/**
 * @param {string} str
 * @return {boolean} Whether the user agent contains the given string.
 */
goog.labs.userAgent.util.matchUserAgentIgnoreCase = function(str) {
  var userAgent = goog.labs.userAgent.util.getUserAgent();
  return goog.string.caseInsensitiveContains(userAgent, str);
};


/**
 * Parses the user agent into tuples for each section.
 * @param {string} userAgent
 * @return {!Array<!Array<string>>} Tuples of key, version, and the contents
 *     of the parenthetical.
 */
goog.labs.userAgent.util.extractVersionTuples = function(userAgent) {
  // Matches each section of a user agent string.
  // Example UA:
  // Mozilla/5.0 (iPad; U; CPU OS 3_2_1 like Mac OS X; en-us)
  // AppleWebKit/531.21.10 (KHTML, like Gecko) Mobile/7B405
  // This has three version tuples: Mozilla, AppleWebKit, and Mobile.

  var versionRegExp = new RegExp(
      // Key. Note that a key may have a space.
      // (i.e. 'Mobile Safari' in 'Mobile Safari/5.0')
      '(\\w[\\w ]+)' +

          '/' +                // slash
          '([^\\s]+)' +        // version (i.e. '5.0b')
          '\\s*' +             // whitespace
          '(?:\\((.*?)\\))?',  // parenthetical info. parentheses not matched.
      'g');

  var data = [];
  var match;

  // Iterate and collect the version tuples.  Each iteration will be the
  // next regex match.
  while (match = versionRegExp.exec(userAgent)) {
    data.push([
      match[1],  // key
      match[2],  // value
      // || undefined as this is not undefined in IE7 and IE8
      match[3] || undefined  // info
    ]);
  }

  return data;
};

// Copyright 2006 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/**
 * @fileoverview Utilities for manipulating objects/maps/hashes.
 * @author arv@google.com (Erik Arvidsson)
 */

goog.provide('goog.object');


/**
 * Whether two values are not observably distinguishable. This
 * correctly detects that 0 is not the same as -0 and two NaNs are
 * practically equivalent.
 *
 * The implementation is as suggested by harmony:egal proposal.
 *
 * @param {*} v The first value to compare.
 * @param {*} v2 The second value to compare.
 * @return {boolean} Whether two values are not observably distinguishable.
 * @see http://wiki.ecmascript.org/doku.php?id=harmony:egal
 */
goog.object.is = function(v, v2) {
  if (v === v2) {
    // 0 === -0, but they are not identical.
    // We need the cast because the compiler requires that v2 is a
    // number (although 1/v2 works with non-number). We cast to ? to
    // stop the compiler from type-checking this statement.
    return v !== 0 || 1 / v === 1 / /** @type {?} */ (v2);
  }

  // NaN is non-reflexive: NaN !== NaN, although they are identical.
  return v !== v && v2 !== v2;
};


/**
 * Calls a function for each element in an object/map/hash.
 *
 * @param {Object<K,V>} obj The object over which to iterate.
 * @param {function(this:T,V,?,Object<K,V>):?} f The function to call
 *     for every element. This function takes 3 arguments (the value, the
 *     key and the object) and the return value is ignored.
 * @param {T=} opt_obj This is used as the 'this' object within f.
 * @template T,K,V
 */
goog.object.forEach = function(obj, f, opt_obj) {
  for (var key in obj) {
    f.call(/** @type {?} */ (opt_obj), obj[key], key, obj);
  }
};


/**
 * Calls a function for each element in an object/map/hash. If that call returns
 * true, adds the element to a new object.
 *
 * @param {Object<K,V>} obj The object over which to iterate.
 * @param {function(this:T,V,?,Object<K,V>):boolean} f The function to call
 *     for every element. This
 *     function takes 3 arguments (the value, the key and the object)
 *     and should return a boolean. If the return value is true the
 *     element is added to the result object. If it is false the
 *     element is not included.
 * @param {T=} opt_obj This is used as the 'this' object within f.
 * @return {!Object<K,V>} a new object in which only elements that passed the
 *     test are present.
 * @template T,K,V
 */
goog.object.filter = function(obj, f, opt_obj) {
  var res = {};
  for (var key in obj) {
    if (f.call(/** @type {?} */ (opt_obj), obj[key], key, obj)) {
      res[key] = obj[key];
    }
  }
  return res;
};


/**
 * For every element in an object/map/hash calls a function and inserts the
 * result into a new object.
 *
 * @param {Object<K,V>} obj The object over which to iterate.
 * @param {function(this:T,V,?,Object<K,V>):R} f The function to call
 *     for every element. This function
 *     takes 3 arguments (the value, the key and the object)
 *     and should return something. The result will be inserted
 *     into a new object.
 * @param {T=} opt_obj This is used as the 'this' object within f.
 * @return {!Object<K,R>} a new object with the results from f.
 * @template T,K,V,R
 */
goog.object.map = function(obj, f, opt_obj) {
  var res = {};
  for (var key in obj) {
    res[key] = f.call(/** @type {?} */ (opt_obj), obj[key], key, obj);
  }
  return res;
};


/**
 * Calls a function for each element in an object/map/hash. If any
 * call returns true, returns true (without checking the rest). If
 * all calls return false, returns false.
 *
 * @param {Object<K,V>} obj The object to check.
 * @param {function(this:T,V,?,Object<K,V>):boolean} f The function to
 *     call for every element. This function
 *     takes 3 arguments (the value, the key and the object) and should
 *     return a boolean.
 * @param {T=} opt_obj This is used as the 'this' object within f.
 * @return {boolean} true if any element passes the test.
 * @template T,K,V
 */
goog.object.some = function(obj, f, opt_obj) {
  for (var key in obj) {
    if (f.call(/** @type {?} */ (opt_obj), obj[key], key, obj)) {
      return true;
    }
  }
  return false;
};


/**
 * Calls a function for each element in an object/map/hash. If
 * all calls return true, returns true. If any call returns false, returns
 * false at this point and does not continue to check the remaining elements.
 *
 * @param {Object<K,V>} obj The object to check.
 * @param {?function(this:T,V,?,Object<K,V>):boolean} f The function to
 *     call for every element. This function
 *     takes 3 arguments (the value, the key and the object) and should
 *     return a boolean.
 * @param {T=} opt_obj This is used as the 'this' object within f.
 * @return {boolean} false if any element fails the test.
 * @template T,K,V
 */
goog.object.every = function(obj, f, opt_obj) {
  for (var key in obj) {
    if (!f.call(/** @type {?} */ (opt_obj), obj[key], key, obj)) {
      return false;
    }
  }
  return true;
};


/**
 * Returns the number of key-value pairs in the object map.
 *
 * @param {Object} obj The object for which to get the number of key-value
 *     pairs.
 * @return {number} The number of key-value pairs in the object map.
 */
goog.object.getCount = function(obj) {
  var rv = 0;
  for (var key in obj) {
    rv++;
  }
  return rv;
};


/**
 * Returns one key from the object map, if any exists.
 * For map literals the returned key will be the first one in most of the
 * browsers (a know exception is Konqueror).
 *
 * @param {Object} obj The object to pick a key from.
 * @return {string|undefined} The key or undefined if the object is empty.
 */
goog.object.getAnyKey = function(obj) {
  for (var key in obj) {
    return key;
  }
};


/**
 * Returns one value from the object map, if any exists.
 * For map literals the returned value will be the first one in most of the
 * browsers (a know exception is Konqueror).
 *
 * @param {Object<K,V>} obj The object to pick a value from.
 * @return {V|undefined} The value or undefined if the object is empty.
 * @template K,V
 */
goog.object.getAnyValue = function(obj) {
  for (var key in obj) {
    return obj[key];
  }
};


/**
 * Whether the object/hash/map contains the given object as a value.
 * An alias for goog.object.containsValue(obj, val).
 *
 * @param {Object<K,V>} obj The object in which to look for val.
 * @param {V} val The object for which to check.
 * @return {boolean} true if val is present.
 * @template K,V
 */
goog.object.contains = function(obj, val) {
  return goog.object.containsValue(obj, val);
};


/**
 * Returns the values of the object/map/hash.
 *
 * @param {Object<K,V>} obj The object from which to get the values.
 * @return {!Array<V>} The values in the object/map/hash.
 * @template K,V
 */
goog.object.getValues = function(obj) {
  var res = [];
  var i = 0;
  for (var key in obj) {
    res[i++] = obj[key];
  }
  return res;
};


/**
 * Returns the keys of the object/map/hash.
 *
 * @param {Object} obj The object from which to get the keys.
 * @return {!Array<string>} Array of property keys.
 */
goog.object.getKeys = function(obj) {
  var res = [];
  var i = 0;
  for (var key in obj) {
    res[i++] = key;
  }
  return res;
};


/**
 * Get a value from an object multiple levels deep.  This is useful for
 * pulling values from deeply nested objects, such as JSON responses.
 * Example usage: getValueByKeys(jsonObj, 'foo', 'entries', 3)
 *
 * @param {!Object} obj An object to get the value from.  Can be array-like.
 * @param {...(string|number|!IArrayLike<number|string>)}
 *     var_args A number of keys
 *     (as strings, or numbers, for array-like objects).  Can also be
 *     specified as a single array of keys.
 * @return {*} The resulting value.  If, at any point, the value for a key
 *     is undefined, returns undefined.
 */
goog.object.getValueByKeys = function(obj, var_args) {
  var isArrayLike = goog.isArrayLike(var_args);
  var keys = isArrayLike ? var_args : arguments;

  // Start with the 2nd parameter for the variable parameters syntax.
  for (var i = isArrayLike ? 0 : 1; i < keys.length; i++) {
    obj = obj[keys[i]];
    if (!goog.isDef(obj)) {
      break;
    }
  }

  return obj;
};


/**
 * Whether the object/map/hash contains the given key.
 *
 * @param {Object} obj The object in which to look for key.
 * @param {?} key The key for which to check.
 * @return {boolean} true If the map contains the key.
 */
goog.object.containsKey = function(obj, key) {
  return obj !== null && key in obj;
};


/**
 * Whether the object/map/hash contains the given value. This is O(n).
 *
 * @param {Object<K,V>} obj The object in which to look for val.
 * @param {V} val The value for which to check.
 * @return {boolean} true If the map contains the value.
 * @template K,V
 */
goog.object.containsValue = function(obj, val) {
  for (var key in obj) {
    if (obj[key] == val) {
      return true;
    }
  }
  return false;
};


/**
 * Searches an object for an element that satisfies the given condition and
 * returns its key.
 * @param {Object<K,V>} obj The object to search in.
 * @param {function(this:T,V,string,Object<K,V>):boolean} f The
 *      function to call for every element. Takes 3 arguments (the value,
 *     the key and the object) and should return a boolean.
 * @param {T=} opt_this An optional "this" context for the function.
 * @return {string|undefined} The key of an element for which the function
 *     returns true or undefined if no such element is found.
 * @template T,K,V
 */
goog.object.findKey = function(obj, f, opt_this) {
  for (var key in obj) {
    if (f.call(/** @type {?} */ (opt_this), obj[key], key, obj)) {
      return key;
    }
  }
  return undefined;
};


/**
 * Searches an object for an element that satisfies the given condition and
 * returns its value.
 * @param {Object<K,V>} obj The object to search in.
 * @param {function(this:T,V,string,Object<K,V>):boolean} f The function
 *     to call for every element. Takes 3 arguments (the value, the key
 *     and the object) and should return a boolean.
 * @param {T=} opt_this An optional "this" context for the function.
 * @return {V} The value of an element for which the function returns true or
 *     undefined if no such element is found.
 * @template T,K,V
 */
goog.object.findValue = function(obj, f, opt_this) {
  var key = goog.object.findKey(obj, f, opt_this);
  return key && obj[key];
};


/**
 * Whether the object/map/hash is empty.
 *
 * @param {Object} obj The object to test.
 * @return {boolean} true if obj is empty.
 */
goog.object.isEmpty = function(obj) {
  for (var key in obj) {
    return false;
  }
  return true;
};


/**
 * Removes all key value pairs from the object/map/hash.
 *
 * @param {Object} obj The object to clear.
 */
goog.object.clear = function(obj) {
  for (var i in obj) {
    delete obj[i];
  }
};


/**
 * Removes a key-value pair based on the key.
 *
 * @param {Object} obj The object from which to remove the key.
 * @param {?} key The key to remove.
 * @return {boolean} Whether an element was removed.
 */
goog.object.remove = function(obj, key) {
  var rv;
  if (rv = key in /** @type {!Object} */ (obj)) {
    delete obj[key];
  }
  return rv;
};


/**
 * Adds a key-value pair to the object. Throws an exception if the key is
 * already in use. Use set if you want to change an existing pair.
 *
 * @param {Object<K,V>} obj The object to which to add the key-value pair.
 * @param {string} key The key to add.
 * @param {V} val The value to add.
 * @template K,V
 */
goog.object.add = function(obj, key, val) {
  if (obj !== null && key in obj) {
    throw Error('The object already contains the key "' + key + '"');
  }
  goog.object.set(obj, key, val);
};


/**
 * Returns the value for the given key.
 *
 * @param {Object<K,V>} obj The object from which to get the value.
 * @param {string} key The key for which to get the value.
 * @param {R=} opt_val The value to return if no item is found for the given
 *     key (default is undefined).
 * @return {V|R|undefined} The value for the given key.
 * @template K,V,R
 */
goog.object.get = function(obj, key, opt_val) {
  if (obj !== null && key in obj) {
    return obj[key];
  }
  return opt_val;
};


/**
 * Adds a key-value pair to the object/map/hash.
 *
 * @param {Object<K,V>} obj The object to which to add the key-value pair.
 * @param {string} key The key to add.
 * @param {V} value The value to add.
 * @template K,V
 */
goog.object.set = function(obj, key, value) {
  obj[key] = value;
};


/**
 * Adds a key-value pair to the object/map/hash if it doesn't exist yet.
 *
 * @param {Object<K,V>} obj The object to which to add the key-value pair.
 * @param {string} key The key to add.
 * @param {V} value The value to add if the key wasn't present.
 * @return {V} The value of the entry at the end of the function.
 * @template K,V
 */
goog.object.setIfUndefined = function(obj, key, value) {
  return key in /** @type {!Object} */ (obj) ? obj[key] : (obj[key] = value);
};


/**
 * Sets a key and value to an object if the key is not set. The value will be
 * the return value of the given function. If the key already exists, the
 * object will not be changed and the function will not be called (the function
 * will be lazily evaluated -- only called if necessary).
 *
 * This function is particularly useful for use with a map used a as a cache.
 *
 * @param {!Object<K,V>} obj The object to which to add the key-value pair.
 * @param {string} key The key to add.
 * @param {function():V} f The value to add if the key wasn't present.
 * @return {V} The value of the entry at the end of the function.
 * @template K,V
 */
goog.object.setWithReturnValueIfNotSet = function(obj, key, f) {
  if (key in obj) {
    return obj[key];
  }

  var val = f();
  obj[key] = val;
  return val;
};


/**
 * Compares two objects for equality using === on the values.
 *
 * @param {!Object<K,V>} a
 * @param {!Object<K,V>} b
 * @return {boolean}
 * @template K,V
 */
goog.object.equals = function(a, b) {
  for (var k in a) {
    if (!(k in b) || a[k] !== b[k]) {
      return false;
    }
  }
  for (var k in b) {
    if (!(k in a)) {
      return false;
    }
  }
  return true;
};


/**
 * Returns a shallow clone of the object.
 *
 * @param {Object<K,V>} obj Object to clone.
 * @return {!Object<K,V>} Clone of the input object.
 * @template K,V
 */
goog.object.clone = function(obj) {
  // We cannot use the prototype trick because a lot of methods depend on where
  // the actual key is set.

  var res = {};
  for (var key in obj) {
    res[key] = obj[key];
  }
  return res;
  // We could also use goog.mixin but I wanted this to be independent from that.
};


/**
 * Clones a value. The input may be an Object, Array, or basic type. Objects and
 * arrays will be cloned recursively.
 *
 * WARNINGS:
 * <code>goog.object.unsafeClone</code> does not detect reference loops. Objects
 * that refer to themselves will cause infinite recursion.
 *
 * <code>goog.object.unsafeClone</code> is unaware of unique identifiers, and
 * copies UIDs created by <code>getUid</code> into cloned results.
 *
 * @param {*} obj The value to clone.
 * @return {*} A clone of the input value.
 */
goog.object.unsafeClone = function(obj) {
  var type = goog.typeOf(obj);
  if (type == 'object' || type == 'array') {
    if (goog.isFunction(obj.clone)) {
      return obj.clone();
    }
    var clone = type == 'array' ? [] : {};
    for (var key in obj) {
      clone[key] = goog.object.unsafeClone(obj[key]);
    }
    return clone;
  }

  return obj;
};


/**
 * Returns a new object in which all the keys and values are interchanged
 * (keys become values and values become keys). If multiple keys map to the
 * same value, the chosen transposed value is implementation-dependent.
 *
 * @param {Object} obj The object to transpose.
 * @return {!Object} The transposed object.
 */
goog.object.transpose = function(obj) {
  var transposed = {};
  for (var key in obj) {
    transposed[obj[key]] = key;
  }
  return transposed;
};


/**
 * The names of the fields that are defined on Object.prototype.
 * @type {Array<string>}
 * @private
 */
goog.object.PROTOTYPE_FIELDS_ = [
  'constructor', 'hasOwnProperty', 'isPrototypeOf', 'propertyIsEnumerable',
  'toLocaleString', 'toString', 'valueOf'
];


/**
 * Extends an object with another object.
 * This operates 'in-place'; it does not create a new Object.
 *
 * Example:
 * var o = {};
 * goog.object.extend(o, {a: 0, b: 1});
 * o; // {a: 0, b: 1}
 * goog.object.extend(o, {b: 2, c: 3});
 * o; // {a: 0, b: 2, c: 3}
 *
 * @param {Object} target The object to modify. Existing properties will be
 *     overwritten if they are also present in one of the objects in
 *     {@code var_args}.
 * @param {...Object} var_args The objects from which values will be copied.
 */
goog.object.extend = function(target, var_args) {
  var key, source;
  for (var i = 1; i < arguments.length; i++) {
    source = arguments[i];
    for (key in source) {
      target[key] = source[key];
    }

    // For IE the for-in-loop does not contain any properties that are not
    // enumerable on the prototype object (for example isPrototypeOf from
    // Object.prototype) and it will also not include 'replace' on objects that
    // extend String and change 'replace' (not that it is common for anyone to
    // extend anything except Object).

    for (var j = 0; j < goog.object.PROTOTYPE_FIELDS_.length; j++) {
      key = goog.object.PROTOTYPE_FIELDS_[j];
      if (Object.prototype.hasOwnProperty.call(source, key)) {
        target[key] = source[key];
      }
    }
  }
};


/**
 * Creates a new object built from the key-value pairs provided as arguments.
 * @param {...*} var_args If only one argument is provided and it is an array
 *     then this is used as the arguments,  otherwise even arguments are used as
 *     the property names and odd arguments are used as the property values.
 * @return {!Object} The new object.
 * @throws {Error} If there are uneven number of arguments or there is only one
 *     non array argument.
 */
goog.object.create = function(var_args) {
  var argLength = arguments.length;
  if (argLength == 1 && goog.isArray(arguments[0])) {
    return goog.object.create.apply(null, arguments[0]);
  }

  if (argLength % 2) {
    throw Error('Uneven number of arguments');
  }

  var rv = {};
  for (var i = 0; i < argLength; i += 2) {
    rv[arguments[i]] = arguments[i + 1];
  }
  return rv;
};


/**
 * Creates a new object where the property names come from the arguments but
 * the value is always set to true
 * @param {...*} var_args If only one argument is provided and it is an array
 *     then this is used as the arguments,  otherwise the arguments are used
 *     as the property names.
 * @return {!Object} The new object.
 */
goog.object.createSet = function(var_args) {
  var argLength = arguments.length;
  if (argLength == 1 && goog.isArray(arguments[0])) {
    return goog.object.createSet.apply(null, arguments[0]);
  }

  var rv = {};
  for (var i = 0; i < argLength; i++) {
    rv[arguments[i]] = true;
  }
  return rv;
};


/**
 * Creates an immutable view of the underlying object, if the browser
 * supports immutable objects.
 *
 * In default mode, writes to this view will fail silently. In strict mode,
 * they will throw an error.
 *
 * @param {!Object<K,V>} obj An object.
 * @return {!Object<K,V>} An immutable view of that object, or the
 *     original object if this browser does not support immutables.
 * @template K,V
 */
goog.object.createImmutableView = function(obj) {
  var result = obj;
  if (Object.isFrozen && !Object.isFrozen(obj)) {
    result = Object.create(obj);
    Object.freeze(result);
  }
  return result;
};


/**
 * @param {!Object} obj An object.
 * @return {boolean} Whether this is an immutable view of the object.
 */
goog.object.isImmutableView = function(obj) {
  return !!Object.isFrozen && Object.isFrozen(obj);
};

// Copyright 2013 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/**
 * @fileoverview Closure user agent detection (Browser).
 * @see <a href="http://www.useragentstring.com/">User agent strings</a>
 * For more information on rendering engine, platform, or device see the other
 * sub-namespaces in goog.labs.userAgent, goog.labs.userAgent.platform,
 * goog.labs.userAgent.device respectively.)
 *
 * @author martone@google.com (Andy Martone)
 */

goog.provide('goog.labs.userAgent.browser');

goog.require('goog.array');
goog.require('goog.labs.userAgent.util');
goog.require('goog.object');
goog.require('goog.string');


// TODO(nnaze): Refactor to remove excessive exclusion logic in matching
// functions.


/**
 * @return {boolean} Whether the user's browser is Opera.  Note: Chromium
 *     based Opera (Opera 15+) is detected as Chrome to avoid unnecessary
 *     special casing.
 * @private
 */
goog.labs.userAgent.browser.matchOpera_ = function() {
  return goog.labs.userAgent.util.matchUserAgent('Opera');
};


/**
 * @return {boolean} Whether the user's browser is IE.
 * @private
 */
goog.labs.userAgent.browser.matchIE_ = function() {
  return goog.labs.userAgent.util.matchUserAgent('Trident') ||
      goog.labs.userAgent.util.matchUserAgent('MSIE');
};


/**
 * @return {boolean} Whether the user's browser is Edge.
 * @private
 */
goog.labs.userAgent.browser.matchEdge_ = function() {
  return goog.labs.userAgent.util.matchUserAgent('Edge');
};


/**
 * @return {boolean} Whether the user's browser is Firefox.
 * @private
 */
goog.labs.userAgent.browser.matchFirefox_ = function() {
  return goog.labs.userAgent.util.matchUserAgent('Firefox');
};


/**
 * @return {boolean} Whether the user's browser is Safari.
 * @private
 */
goog.labs.userAgent.browser.matchSafari_ = function() {
  return goog.labs.userAgent.util.matchUserAgent('Safari') &&
      !(goog.labs.userAgent.browser.matchChrome_() ||
        goog.labs.userAgent.browser.matchCoast_() ||
        goog.labs.userAgent.browser.matchOpera_() ||
        goog.labs.userAgent.browser.matchEdge_() ||
        goog.labs.userAgent.browser.isSilk() ||
        goog.labs.userAgent.util.matchUserAgent('Android'));
};


/**
 * @return {boolean} Whether the user's browser is Coast (Opera's Webkit-based
 *     iOS browser).
 * @private
 */
goog.labs.userAgent.browser.matchCoast_ = function() {
  return goog.labs.userAgent.util.matchUserAgent('Coast');
};


/**
 * @return {boolean} Whether the user's browser is iOS Webview.
 * @private
 */
goog.labs.userAgent.browser.matchIosWebview_ = function() {
  // iOS Webview does not show up as Chrome or Safari. Also check for Opera's
  // WebKit-based iOS browser, Coast.
  return (goog.labs.userAgent.util.matchUserAgent('iPad') ||
          goog.labs.userAgent.util.matchUserAgent('iPhone')) &&
      !goog.labs.userAgent.browser.matchSafari_() &&
      !goog.labs.userAgent.browser.matchChrome_() &&
      !goog.labs.userAgent.browser.matchCoast_() &&
      goog.labs.userAgent.util.matchUserAgent('AppleWebKit');
};


/**
 * @return {boolean} Whether the user's browser is Chrome.
 * @private
 */
goog.labs.userAgent.browser.matchChrome_ = function() {
  return (goog.labs.userAgent.util.matchUserAgent('Chrome') ||
          goog.labs.userAgent.util.matchUserAgent('CriOS')) &&
      !goog.labs.userAgent.browser.matchEdge_();
};


/**
 * @return {boolean} Whether the user's browser is the Android browser.
 * @private
 */
goog.labs.userAgent.browser.matchAndroidBrowser_ = function() {
  // Android can appear in the user agent string for Chrome on Android.
  // This is not the Android standalone browser if it does.
  return goog.labs.userAgent.util.matchUserAgent('Android') &&
      !(goog.labs.userAgent.browser.isChrome() ||
        goog.labs.userAgent.browser.isFirefox() ||
        goog.labs.userAgent.browser.isOpera() ||
        goog.labs.userAgent.browser.isSilk());
};


/**
 * @return {boolean} Whether the user's browser is Opera.
 */
goog.labs.userAgent.browser.isOpera = goog.labs.userAgent.browser.matchOpera_;


/**
 * @return {boolean} Whether the user's browser is IE.
 */
goog.labs.userAgent.browser.isIE = goog.labs.userAgent.browser.matchIE_;


/**
 * @return {boolean} Whether the user's browser is Edge.
 */
goog.labs.userAgent.browser.isEdge = goog.labs.userAgent.browser.matchEdge_;


/**
 * @return {boolean} Whether the user's browser is Firefox.
 */
goog.labs.userAgent.browser.isFirefox =
    goog.labs.userAgent.browser.matchFirefox_;


/**
 * @return {boolean} Whether the user's browser is Safari.
 */
goog.labs.userAgent.browser.isSafari = goog.labs.userAgent.browser.matchSafari_;


/**
 * @return {boolean} Whether the user's browser is Coast (Opera's Webkit-based
 *     iOS browser).
 */
goog.labs.userAgent.browser.isCoast = goog.labs.userAgent.browser.matchCoast_;


/**
 * @return {boolean} Whether the user's browser is iOS Webview.
 */
goog.labs.userAgent.browser.isIosWebview =
    goog.labs.userAgent.browser.matchIosWebview_;


/**
 * @return {boolean} Whether the user's browser is Chrome.
 */
goog.labs.userAgent.browser.isChrome = goog.labs.userAgent.browser.matchChrome_;


/**
 * @return {boolean} Whether the user's browser is the Android browser.
 */
goog.labs.userAgent.browser.isAndroidBrowser =
    goog.labs.userAgent.browser.matchAndroidBrowser_;


/**
 * For more information, see:
 * http://docs.aws.amazon.com/silk/latest/developerguide/user-agent.html
 * @return {boolean} Whether the user's browser is Silk.
 */
goog.labs.userAgent.browser.isSilk = function() {
  return goog.labs.userAgent.util.matchUserAgent('Silk');
};


/**
 * @return {string} The browser version or empty string if version cannot be
 *     determined. Note that for Internet Explorer, this returns the version of
 *     the browser, not the version of the rendering engine. (IE 8 in
 *     compatibility mode will return 8.0 rather than 7.0. To determine the
 *     rendering engine version, look at document.documentMode instead. See
 *     http://msdn.microsoft.com/en-us/library/cc196988(v=vs.85).aspx for more
 *     details.)
 */
goog.labs.userAgent.browser.getVersion = function() {
  var userAgentString = goog.labs.userAgent.util.getUserAgent();
  // Special case IE since IE's version is inside the parenthesis and
  // without the '/'.
  if (goog.labs.userAgent.browser.isIE()) {
    return goog.labs.userAgent.browser.getIEVersion_(userAgentString);
  }

  var versionTuples =
      goog.labs.userAgent.util.extractVersionTuples(userAgentString);

  // Construct a map for easy lookup.
  var versionMap = {};
  goog.array.forEach(versionTuples, function(tuple) {
    // Note that the tuple is of length three, but we only care about the
    // first two.
    var key = tuple[0];
    var value = tuple[1];
    versionMap[key] = value;
  });

  var versionMapHasKey = goog.partial(goog.object.containsKey, versionMap);

  // Gives the value with the first key it finds, otherwise empty string.
  function lookUpValueWithKeys(keys) {
    var key = goog.array.find(keys, versionMapHasKey);
    return versionMap[key] || '';
  }

  // Check Opera before Chrome since Opera 15+ has "Chrome" in the string.
  // See
  // http://my.opera.com/ODIN/blog/2013/07/15/opera-user-agent-strings-opera-15-and-beyond
  if (goog.labs.userAgent.browser.isOpera()) {
    // Opera 10 has Version/10.0 but Opera/9.8, so look for "Version" first.
    // Opera uses 'OPR' for more recent UAs.
    return lookUpValueWithKeys(['Version', 'Opera']);
  }

  // Check Edge before Chrome since it has Chrome in the string.
  if (goog.labs.userAgent.browser.isEdge()) {
    return lookUpValueWithKeys(['Edge']);
  }

  if (goog.labs.userAgent.browser.isChrome()) {
    return lookUpValueWithKeys(['Chrome', 'CriOS']);
  }

  // Usually products browser versions are in the third tuple after "Mozilla"
  // and the engine.
  var tuple = versionTuples[2];
  return tuple && tuple[1] || '';
};


/**
 * @param {string|number} version The version to check.
 * @return {boolean} Whether the browser version is higher or the same as the
 *     given version.
 */
goog.labs.userAgent.browser.isVersionOrHigher = function(version) {
  return goog.string.compareVersions(
             goog.labs.userAgent.browser.getVersion(), version) >= 0;
};


/**
 * Determines IE version. More information:
 * http://msdn.microsoft.com/en-us/library/ie/bg182625(v=vs.85).aspx#uaString
 * http://msdn.microsoft.com/en-us/library/hh869301(v=vs.85).aspx
 * http://blogs.msdn.com/b/ie/archive/2010/03/23/introducing-ie9-s-user-agent-string.aspx
 * http://blogs.msdn.com/b/ie/archive/2009/01/09/the-internet-explorer-8-user-agent-string-updated-edition.aspx
 *
 * @param {string} userAgent the User-Agent.
 * @return {string}
 * @private
 */
goog.labs.userAgent.browser.getIEVersion_ = function(userAgent) {
  // IE11 may identify itself as MSIE 9.0 or MSIE 10.0 due to an IE 11 upgrade
  // bug. Example UA:
  // Mozilla/5.0 (MSIE 9.0; Windows NT 6.1; WOW64; Trident/7.0; rv:11.0)
  // like Gecko.
  // See http://www.whatismybrowser.com/developers/unknown-user-agent-fragments.
  var rv = /rv: *([\d\.]*)/.exec(userAgent);
  if (rv && rv[1]) {
    return rv[1];
  }

  var version = '';
  var msie = /MSIE +([\d\.]+)/.exec(userAgent);
  if (msie && msie[1]) {
    // IE in compatibility mode usually identifies itself as MSIE 7.0; in this
    // case, use the Trident version to determine the version of IE. For more
    // details, see the links above.
    var tridentVersion = /Trident\/(\d.\d)/.exec(userAgent);
    if (msie[1] == '7.0') {
      if (tridentVersion && tridentVersion[1]) {
        switch (tridentVersion[1]) {
          case '4.0':
            version = '8.0';
            break;
          case '5.0':
            version = '9.0';
            break;
          case '6.0':
            version = '10.0';
            break;
          case '7.0':
            version = '11.0';
            break;
        }
      } else {
        version = '7.0';
      }
    } else {
      version = msie[1];
    }
  }
  return version;
};

// Copyright 2013 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/**
 * @fileoverview Closure user agent detection.
 * @see http://en.wikipedia.org/wiki/User_agent
 * For more information on browser brand, platform, or device see the other
 * sub-namespaces in goog.labs.userAgent (browser, platform, and device).
 *
 */

goog.provide('goog.labs.userAgent.engine');

goog.require('goog.array');
goog.require('goog.labs.userAgent.util');
goog.require('goog.string');


/**
 * @return {boolean} Whether the rendering engine is Presto.
 */
goog.labs.userAgent.engine.isPresto = function() {
  return goog.labs.userAgent.util.matchUserAgent('Presto');
};


/**
 * @return {boolean} Whether the rendering engine is Trident.
 */
goog.labs.userAgent.engine.isTrident = function() {
  // IE only started including the Trident token in IE8.
  return goog.labs.userAgent.util.matchUserAgent('Trident') ||
      goog.labs.userAgent.util.matchUserAgent('MSIE');
};


/**
 * @return {boolean} Whether the rendering engine is Edge.
 */
goog.labs.userAgent.engine.isEdge = function() {
  return goog.labs.userAgent.util.matchUserAgent('Edge');
};


/**
 * @return {boolean} Whether the rendering engine is WebKit.
 */
goog.labs.userAgent.engine.isWebKit = function() {
  return goog.labs.userAgent.util.matchUserAgentIgnoreCase('WebKit') &&
      !goog.labs.userAgent.engine.isEdge();
};


/**
 * @return {boolean} Whether the rendering engine is Gecko.
 */
goog.labs.userAgent.engine.isGecko = function() {
  return goog.labs.userAgent.util.matchUserAgent('Gecko') &&
      !goog.labs.userAgent.engine.isWebKit() &&
      !goog.labs.userAgent.engine.isTrident() &&
      !goog.labs.userAgent.engine.isEdge();
};


/**
 * @return {string} The rendering engine's version or empty string if version
 *     can't be determined.
 */
goog.labs.userAgent.engine.getVersion = function() {
  var userAgentString = goog.labs.userAgent.util.getUserAgent();
  if (userAgentString) {
    var tuples = goog.labs.userAgent.util.extractVersionTuples(userAgentString);

    var engineTuple = goog.labs.userAgent.engine.getEngineTuple_(tuples);
    if (engineTuple) {
      // In Gecko, the version string is either in the browser info or the
      // Firefox version.  See Gecko user agent string reference:
      // http://goo.gl/mULqa
      if (engineTuple[0] == 'Gecko') {
        return goog.labs.userAgent.engine.getVersionForKey_(tuples, 'Firefox');
      }

      return engineTuple[1];
    }

    // MSIE has only one version identifier, and the Trident version is
    // specified in the parenthetical. IE Edge is covered in the engine tuple
    // detection.
    var browserTuple = tuples[0];
    var info;
    if (browserTuple && (info = browserTuple[2])) {
      var match = /Trident\/([^\s;]+)/.exec(info);
      if (match) {
        return match[1];
      }
    }
  }
  return '';
};


/**
 * @param {!Array<!Array<string>>} tuples Extracted version tuples.
 * @return {!Array<string>|undefined} The engine tuple or undefined if not
 *     found.
 * @private
 */
goog.labs.userAgent.engine.getEngineTuple_ = function(tuples) {
  if (!goog.labs.userAgent.engine.isEdge()) {
    return tuples[1];
  }
  for (var i = 0; i < tuples.length; i++) {
    var tuple = tuples[i];
    if (tuple[0] == 'Edge') {
      return tuple;
    }
  }
};


/**
 * @param {string|number} version The version to check.
 * @return {boolean} Whether the rendering engine version is higher or the same
 *     as the given version.
 */
goog.labs.userAgent.engine.isVersionOrHigher = function(version) {
  return goog.string.compareVersions(
             goog.labs.userAgent.engine.getVersion(), version) >= 0;
};


/**
 * @param {!Array<!Array<string>>} tuples Version tuples.
 * @param {string} key The key to look for.
 * @return {string} The version string of the given key, if present.
 *     Otherwise, the empty string.
 * @private
 */
goog.labs.userAgent.engine.getVersionForKey_ = function(tuples, key) {
  // TODO(nnaze): Move to util if useful elsewhere.

  var pair = goog.array.find(tuples, function(pair) { return key == pair[0]; });

  return pair && pair[1] || '';
};

// Copyright 2013 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/**
 * @fileoverview Closure user agent platform detection.
 * @see <a href="http://www.useragentstring.com/">User agent strings</a>
 * For more information on browser brand, rendering engine, or device see the
 * other sub-namespaces in goog.labs.userAgent (browser, engine, and device
 * respectively).
 *
 */

goog.provide('goog.labs.userAgent.platform');

goog.require('goog.labs.userAgent.util');
goog.require('goog.string');


/**
 * @return {boolean} Whether the platform is Android.
 */
goog.labs.userAgent.platform.isAndroid = function() {
  return goog.labs.userAgent.util.matchUserAgent('Android');
};


/**
 * @return {boolean} Whether the platform is iPod.
 */
goog.labs.userAgent.platform.isIpod = function() {
  return goog.labs.userAgent.util.matchUserAgent('iPod');
};


/**
 * @return {boolean} Whether the platform is iPhone.
 */
goog.labs.userAgent.platform.isIphone = function() {
  return goog.labs.userAgent.util.matchUserAgent('iPhone') &&
      !goog.labs.userAgent.util.matchUserAgent('iPod') &&
      !goog.labs.userAgent.util.matchUserAgent('iPad');
};


/**
 * @return {boolean} Whether the platform is iPad.
 */
goog.labs.userAgent.platform.isIpad = function() {
  return goog.labs.userAgent.util.matchUserAgent('iPad');
};


/**
 * @return {boolean} Whether the platform is iOS.
 */
goog.labs.userAgent.platform.isIos = function() {
  return goog.labs.userAgent.platform.isIphone() ||
      goog.labs.userAgent.platform.isIpad() ||
      goog.labs.userAgent.platform.isIpod();
};


/**
 * @return {boolean} Whether the platform is Mac.
 */
goog.labs.userAgent.platform.isMacintosh = function() {
  return goog.labs.userAgent.util.matchUserAgent('Macintosh');
};


/**
 * Note: ChromeOS is not considered to be Linux as it does not report itself
 * as Linux in the user agent string.
 * @return {boolean} Whether the platform is Linux.
 */
goog.labs.userAgent.platform.isLinux = function() {
  return goog.labs.userAgent.util.matchUserAgent('Linux');
};


/**
 * @return {boolean} Whether the platform is Windows.
 */
goog.labs.userAgent.platform.isWindows = function() {
  return goog.labs.userAgent.util.matchUserAgent('Windows');
};


/**
 * @return {boolean} Whether the platform is ChromeOS.
 */
goog.labs.userAgent.platform.isChromeOS = function() {
  return goog.labs.userAgent.util.matchUserAgent('CrOS');
};


/**
 * The version of the platform. We only determine the version for Windows,
 * Mac, and Chrome OS. It doesn't make much sense on Linux. For Windows, we only
 * look at the NT version. Non-NT-based versions (e.g. 95, 98, etc.) are given
 * version 0.0.
 *
 * @return {string} The platform version or empty string if version cannot be
 *     determined.
 */
goog.labs.userAgent.platform.getVersion = function() {
  var userAgentString = goog.labs.userAgent.util.getUserAgent();
  var version = '', re;
  if (goog.labs.userAgent.platform.isWindows()) {
    re = /Windows (?:NT|Phone) ([0-9.]+)/;
    var match = re.exec(userAgentString);
    if (match) {
      version = match[1];
    } else {
      version = '0.0';
    }
  } else if (goog.labs.userAgent.platform.isIos()) {
    re = /(?:iPhone|iPod|iPad|CPU)\s+OS\s+(\S+)/;
    var match = re.exec(userAgentString);
    // Report the version as x.y.z and not x_y_z
    version = match && match[1].replace(/_/g, '.');
  } else if (goog.labs.userAgent.platform.isMacintosh()) {
    re = /Mac OS X ([0-9_.]+)/;
    var match = re.exec(userAgentString);
    // Note: some old versions of Camino do not report an OSX version.
    // Default to 10.
    version = match ? match[1].replace(/_/g, '.') : '10';
  } else if (goog.labs.userAgent.platform.isAndroid()) {
    re = /Android\s+([^\);]+)(\)|;)/;
    var match = re.exec(userAgentString);
    version = match && match[1];
  } else if (goog.labs.userAgent.platform.isChromeOS()) {
    re = /(?:CrOS\s+(?:i686|x86_64)\s+([0-9.]+))/;
    var match = re.exec(userAgentString);
    version = match && match[1];
  }
  return version || '';
};


/**
 * @param {string|number} version The version to check.
 * @return {boolean} Whether the browser version is higher or the same as the
 *     given version.
 */
goog.labs.userAgent.platform.isVersionOrHigher = function(version) {
  return goog.string.compareVersions(
             goog.labs.userAgent.platform.getVersion(), version) >= 0;
};

// Copyright 2006 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/**
 * @fileoverview Rendering engine detection.
 * @see <a href="http://www.useragentstring.com/">User agent strings</a>
 * For information on the browser brand (such as Safari versus Chrome), see
 * goog.userAgent.product.
 * @author arv@google.com (Erik Arvidsson)
 * @see ../demos/useragent.html
 */

goog.provide('goog.userAgent');

goog.require('goog.labs.userAgent.browser');
goog.require('goog.labs.userAgent.engine');
goog.require('goog.labs.userAgent.platform');
goog.require('goog.labs.userAgent.util');
goog.require('goog.string');


/**
 * @define {boolean} Whether we know at compile-time that the browser is IE.
 */
goog.define('goog.userAgent.ASSUME_IE', false);


/**
 * @define {boolean} Whether we know at compile-time that the browser is EDGE.
 */
goog.define('goog.userAgent.ASSUME_EDGE', false);


/**
 * @define {boolean} Whether we know at compile-time that the browser is GECKO.
 */
goog.define('goog.userAgent.ASSUME_GECKO', false);


/**
 * @define {boolean} Whether we know at compile-time that the browser is WEBKIT.
 */
goog.define('goog.userAgent.ASSUME_WEBKIT', false);


/**
 * @define {boolean} Whether we know at compile-time that the browser is a
 *     mobile device running WebKit e.g. iPhone or Android.
 */
goog.define('goog.userAgent.ASSUME_MOBILE_WEBKIT', false);


/**
 * @define {boolean} Whether we know at compile-time that the browser is OPERA.
 */
goog.define('goog.userAgent.ASSUME_OPERA', false);


/**
 * @define {boolean} Whether the
 *     {@code goog.userAgent.isVersionOrHigher}
 *     function will return true for any version.
 */
goog.define('goog.userAgent.ASSUME_ANY_VERSION', false);


/**
 * Whether we know the browser engine at compile-time.
 * @type {boolean}
 * @private
 */
goog.userAgent.BROWSER_KNOWN_ = goog.userAgent.ASSUME_IE ||
    goog.userAgent.ASSUME_EDGE || goog.userAgent.ASSUME_GECKO ||
    goog.userAgent.ASSUME_MOBILE_WEBKIT || goog.userAgent.ASSUME_WEBKIT ||
    goog.userAgent.ASSUME_OPERA;


/**
 * Returns the userAgent string for the current browser.
 *
 * @return {string} The userAgent string.
 */
goog.userAgent.getUserAgentString = function() {
  return goog.labs.userAgent.util.getUserAgent();
};


/**
 * TODO(nnaze): Change type to "Navigator" and update compilation targets.
 * @return {Object} The native navigator object.
 */
goog.userAgent.getNavigator = function() {
  // Need a local navigator reference instead of using the global one,
  // to avoid the rare case where they reference different objects.
  // (in a WorkerPool, for example).
  return goog.global['navigator'] || null;
};


/**
 * Whether the user agent is Opera.
 * @type {boolean}
 */
goog.userAgent.OPERA = goog.userAgent.BROWSER_KNOWN_ ?
    goog.userAgent.ASSUME_OPERA :
    goog.labs.userAgent.browser.isOpera();


/**
 * Whether the user agent is Internet Explorer.
 * @type {boolean}
 */
goog.userAgent.IE = goog.userAgent.BROWSER_KNOWN_ ?
    goog.userAgent.ASSUME_IE :
    goog.labs.userAgent.browser.isIE();


/**
 * Whether the user agent is Microsoft Edge.
 * @type {boolean}
 */
goog.userAgent.EDGE = goog.userAgent.BROWSER_KNOWN_ ?
    goog.userAgent.ASSUME_EDGE :
    goog.labs.userAgent.engine.isEdge();


/**
 * Whether the user agent is MS Internet Explorer or MS Edge.
 * @type {boolean}
 */
goog.userAgent.EDGE_OR_IE = goog.userAgent.EDGE || goog.userAgent.IE;


/**
 * Whether the user agent is Gecko. Gecko is the rendering engine used by
 * Mozilla, Firefox, and others.
 * @type {boolean}
 */
goog.userAgent.GECKO = goog.userAgent.BROWSER_KNOWN_ ?
    goog.userAgent.ASSUME_GECKO :
    goog.labs.userAgent.engine.isGecko();


/**
 * Whether the user agent is WebKit. WebKit is the rendering engine that
 * Safari, Android and others use.
 * @type {boolean}
 */
goog.userAgent.WEBKIT = goog.userAgent.BROWSER_KNOWN_ ?
    goog.userAgent.ASSUME_WEBKIT || goog.userAgent.ASSUME_MOBILE_WEBKIT :
    goog.labs.userAgent.engine.isWebKit();


/**
 * Whether the user agent is running on a mobile device.
 *
 * This is a separate function so that the logic can be tested.
 *
 * TODO(nnaze): Investigate swapping in goog.labs.userAgent.device.isMobile().
 *
 * @return {boolean} Whether the user agent is running on a mobile device.
 * @private
 */
goog.userAgent.isMobile_ = function() {
  return goog.userAgent.WEBKIT &&
      goog.labs.userAgent.util.matchUserAgent('Mobile');
};


/**
 * Whether the user agent is running on a mobile device.
 *
 * TODO(nnaze): Consider deprecating MOBILE when labs.userAgent
 *   is promoted as the gecko/webkit logic is likely inaccurate.
 *
 * @type {boolean}
 */
goog.userAgent.MOBILE =
    goog.userAgent.ASSUME_MOBILE_WEBKIT || goog.userAgent.isMobile_();


/**
 * Used while transitioning code to use WEBKIT instead.
 * @type {boolean}
 * @deprecated Use {@link goog.userAgent.product.SAFARI} instead.
 * TODO(nicksantos): Delete this from goog.userAgent.
 */
goog.userAgent.SAFARI = goog.userAgent.WEBKIT;


/**
 * @return {string} the platform (operating system) the user agent is running
 *     on. Default to empty string because navigator.platform may not be defined
 *     (on Rhino, for example).
 * @private
 */
goog.userAgent.determinePlatform_ = function() {
  var navigator = goog.userAgent.getNavigator();
  return navigator && navigator.platform || '';
};


/**
 * The platform (operating system) the user agent is running on. Default to
 * empty string because navigator.platform may not be defined (on Rhino, for
 * example).
 * @type {string}
 */
goog.userAgent.PLATFORM = goog.userAgent.determinePlatform_();


/**
 * @define {boolean} Whether the user agent is running on a Macintosh operating
 *     system.
 */
goog.define('goog.userAgent.ASSUME_MAC', false);


/**
 * @define {boolean} Whether the user agent is running on a Windows operating
 *     system.
 */
goog.define('goog.userAgent.ASSUME_WINDOWS', false);


/**
 * @define {boolean} Whether the user agent is running on a Linux operating
 *     system.
 */
goog.define('goog.userAgent.ASSUME_LINUX', false);


/**
 * @define {boolean} Whether the user agent is running on a X11 windowing
 *     system.
 */
goog.define('goog.userAgent.ASSUME_X11', false);


/**
 * @define {boolean} Whether the user agent is running on Android.
 */
goog.define('goog.userAgent.ASSUME_ANDROID', false);


/**
 * @define {boolean} Whether the user agent is running on an iPhone.
 */
goog.define('goog.userAgent.ASSUME_IPHONE', false);


/**
 * @define {boolean} Whether the user agent is running on an iPad.
 */
goog.define('goog.userAgent.ASSUME_IPAD', false);


/**
 * @define {boolean} Whether the user agent is running on an iPod.
 */
goog.define('goog.userAgent.ASSUME_IPOD', false);


/**
 * @type {boolean}
 * @private
 */
goog.userAgent.PLATFORM_KNOWN_ = goog.userAgent.ASSUME_MAC ||
    goog.userAgent.ASSUME_WINDOWS || goog.userAgent.ASSUME_LINUX ||
    goog.userAgent.ASSUME_X11 || goog.userAgent.ASSUME_ANDROID ||
    goog.userAgent.ASSUME_IPHONE || goog.userAgent.ASSUME_IPAD ||
    goog.userAgent.ASSUME_IPOD;


/**
 * Whether the user agent is running on a Macintosh operating system.
 * @type {boolean}
 */
goog.userAgent.MAC = goog.userAgent.PLATFORM_KNOWN_ ?
    goog.userAgent.ASSUME_MAC :
    goog.labs.userAgent.platform.isMacintosh();


/**
 * Whether the user agent is running on a Windows operating system.
 * @type {boolean}
 */
goog.userAgent.WINDOWS = goog.userAgent.PLATFORM_KNOWN_ ?
    goog.userAgent.ASSUME_WINDOWS :
    goog.labs.userAgent.platform.isWindows();


/**
 * Whether the user agent is Linux per the legacy behavior of
 * goog.userAgent.LINUX, which considered ChromeOS to also be
 * Linux.
 * @return {boolean}
 * @private
 */
goog.userAgent.isLegacyLinux_ = function() {
  return goog.labs.userAgent.platform.isLinux() ||
      goog.labs.userAgent.platform.isChromeOS();
};


/**
 * Whether the user agent is running on a Linux operating system.
 *
 * Note that goog.userAgent.LINUX considers ChromeOS to be Linux,
 * while goog.labs.userAgent.platform considers ChromeOS and
 * Linux to be different OSes.
 *
 * @type {boolean}
 */
goog.userAgent.LINUX = goog.userAgent.PLATFORM_KNOWN_ ?
    goog.userAgent.ASSUME_LINUX :
    goog.userAgent.isLegacyLinux_();


/**
 * @return {boolean} Whether the user agent is an X11 windowing system.
 * @private
 */
goog.userAgent.isX11_ = function() {
  var navigator = goog.userAgent.getNavigator();
  return !!navigator &&
      goog.string.contains(navigator['appVersion'] || '', 'X11');
};


/**
 * Whether the user agent is running on a X11 windowing system.
 * @type {boolean}
 */
goog.userAgent.X11 = goog.userAgent.PLATFORM_KNOWN_ ?
    goog.userAgent.ASSUME_X11 :
    goog.userAgent.isX11_();


/**
 * Whether the user agent is running on Android.
 * @type {boolean}
 */
goog.userAgent.ANDROID = goog.userAgent.PLATFORM_KNOWN_ ?
    goog.userAgent.ASSUME_ANDROID :
    goog.labs.userAgent.platform.isAndroid();


/**
 * Whether the user agent is running on an iPhone.
 * @type {boolean}
 */
goog.userAgent.IPHONE = goog.userAgent.PLATFORM_KNOWN_ ?
    goog.userAgent.ASSUME_IPHONE :
    goog.labs.userAgent.platform.isIphone();


/**
 * Whether the user agent is running on an iPad.
 * @type {boolean}
 */
goog.userAgent.IPAD = goog.userAgent.PLATFORM_KNOWN_ ?
    goog.userAgent.ASSUME_IPAD :
    goog.labs.userAgent.platform.isIpad();


/**
 * Whether the user agent is running on an iPod.
 * @type {boolean}
 */
goog.userAgent.IPOD = goog.userAgent.PLATFORM_KNOWN_ ?
    goog.userAgent.ASSUME_IPOD :
    goog.labs.userAgent.platform.isIpod();


/**
 * @return {string} The string that describes the version number of the user
 *     agent.
 * @private
 */
goog.userAgent.determineVersion_ = function() {
  // All browsers have different ways to detect the version and they all have
  // different naming schemes.
  // version is a string rather than a number because it may contain 'b', 'a',
  // and so on.
  var version = '';
  var arr = goog.userAgent.getVersionRegexResult_();
  if (arr) {
    version = arr ? arr[1] : '';
  }

  if (goog.userAgent.IE) {
    // IE9 can be in document mode 9 but be reporting an inconsistent user agent
    // version.  If it is identifying as a version lower than 9 we take the
    // documentMode as the version instead.  IE8 has similar behavior.
    // It is recommended to set the X-UA-Compatible header to ensure that IE9
    // uses documentMode 9.
    var docMode = goog.userAgent.getDocumentMode_();
    if (docMode != null && docMode > parseFloat(version)) {
      return String(docMode);
    }
  }

  return version;
};


/**
 * @return {?Array|undefined} The version regex matches from parsing the user
 *     agent string. These regex statements must be executed inline so they can
 *     be compiled out by the closure compiler with the rest of the useragent
 *     detection logic when ASSUME_* is specified.
 * @private
 */
goog.userAgent.getVersionRegexResult_ = function() {
  var userAgent = goog.userAgent.getUserAgentString();
  if (goog.userAgent.GECKO) {
    return /rv\:([^\);]+)(\)|;)/.exec(userAgent);
  }
  if (goog.userAgent.EDGE) {
    return /Edge\/([\d\.]+)/.exec(userAgent);
  }
  if (goog.userAgent.IE) {
    return /\b(?:MSIE|rv)[: ]([^\);]+)(\)|;)/.exec(userAgent);
  }
  if (goog.userAgent.WEBKIT) {
    // WebKit/125.4
    return /WebKit\/(\S+)/.exec(userAgent);
  }
  if (goog.userAgent.OPERA) {
    // If none of the above browsers were detected but the browser is Opera, the
    // only string that is of interest is 'Version/<number>'.
    return /(?:Version)[ \/]?(\S+)/.exec(userAgent);
  }
  return undefined;
};


/**
 * @return {number|undefined} Returns the document mode (for testing).
 * @private
 */
goog.userAgent.getDocumentMode_ = function() {
  // NOTE(user): goog.userAgent may be used in context where there is no DOM.
  var doc = goog.global['document'];
  return doc ? doc['documentMode'] : undefined;
};


/**
 * The version of the user agent. This is a string because it might contain
 * 'b' (as in beta) as well as multiple dots.
 * @type {string}
 */
goog.userAgent.VERSION = goog.userAgent.determineVersion_();


/**
 * Compares two version numbers.
 *
 * @param {string} v1 Version of first item.
 * @param {string} v2 Version of second item.
 *
 * @return {number}  1 if first argument is higher
 *                   0 if arguments are equal
 *                  -1 if second argument is higher.
 * @deprecated Use goog.string.compareVersions.
 */
goog.userAgent.compare = function(v1, v2) {
  return goog.string.compareVersions(v1, v2);
};


/**
 * Cache for {@link goog.userAgent.isVersionOrHigher}.
 * Calls to compareVersions are surprisingly expensive and, as a browser's
 * version number is unlikely to change during a session, we cache the results.
 * @const
 * @private
 */
goog.userAgent.isVersionOrHigherCache_ = {};


/**
 * Whether the user agent version is higher or the same as the given version.
 * NOTE: When checking the version numbers for Firefox and Safari, be sure to
 * use the engine's version, not the browser's version number.  For example,
 * Firefox 3.0 corresponds to Gecko 1.9 and Safari 3.0 to Webkit 522.11.
 * Opera and Internet Explorer versions match the product release number.<br>
 * @see <a href="http://en.wikipedia.org/wiki/Safari_version_history">
 *     Webkit</a>
 * @see <a href="http://en.wikipedia.org/wiki/Gecko_engine">Gecko</a>
 *
 * @param {string|number} version The version to check.
 * @return {boolean} Whether the user agent version is higher or the same as
 *     the given version.
 */
goog.userAgent.isVersionOrHigher = function(version) {
  return goog.userAgent.ASSUME_ANY_VERSION ||
      goog.userAgent.isVersionOrHigherCache_[version] ||
      (goog.userAgent.isVersionOrHigherCache_[version] =
           goog.string.compareVersions(goog.userAgent.VERSION, version) >= 0);
};


/**
 * Deprecated alias to {@code goog.userAgent.isVersionOrHigher}.
 * @param {string|number} version The version to check.
 * @return {boolean} Whether the user agent version is higher or the same as
 *     the given version.
 * @deprecated Use goog.userAgent.isVersionOrHigher().
 */
goog.userAgent.isVersion = goog.userAgent.isVersionOrHigher;


/**
 * Whether the IE effective document mode is higher or the same as the given
 * document mode version.
 * NOTE: Only for IE, return false for another browser.
 *
 * @param {number} documentMode The document mode version to check.
 * @return {boolean} Whether the IE effective document mode is higher or the
 *     same as the given version.
 */
goog.userAgent.isDocumentModeOrHigher = function(documentMode) {
  return Number(goog.userAgent.DOCUMENT_MODE) >= documentMode;
};


/**
 * Deprecated alias to {@code goog.userAgent.isDocumentModeOrHigher}.
 * @param {number} version The version to check.
 * @return {boolean} Whether the IE effective document mode is higher or the
 *      same as the given version.
 * @deprecated Use goog.userAgent.isDocumentModeOrHigher().
 */
goog.userAgent.isDocumentMode = goog.userAgent.isDocumentModeOrHigher;


/**
 * For IE version < 7, documentMode is undefined, so attempt to use the
 * CSS1Compat property to see if we are in standards mode. If we are in
 * standards mode, treat the browser version as the document mode. Otherwise,
 * IE is emulating version 5.
 * @type {number|undefined}
 * @const
 */
goog.userAgent.DOCUMENT_MODE = (function() {
  var doc = goog.global['document'];
  var mode = goog.userAgent.getDocumentMode_();
  if (!doc || !goog.userAgent.IE) {
    return undefined;
  }
  return mode || (doc['compatMode'] == 'CSS1Compat' ?
                      parseInt(goog.userAgent.VERSION, 10) :
                      5);
})();

goog.provide('ol.vec.Mat4');


/**
 * @return {Array.<number>} 4x4 matrix representing a 3D identity transform.
 */
ol.vec.Mat4.create = function() {
  return [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1];
};


/**
 * @param {Array.<number>} mat4 Flattened 4x4 matrix receiving the result.
 * @param {ol.Transform} transform Transformation matrix.
 * @return {Array.<number>} 2D transformation matrix as flattened 4x4 matrix.
 */
ol.vec.Mat4.fromTransform = function(mat4, transform) {
  mat4[0] = transform[0];
  mat4[1] = transform[1];
  mat4[4] = transform[2];
  mat4[5] = transform[3];
  mat4[12] = transform[4];
  mat4[13] = transform[5];
  return mat4;
};

goog.provide('ol.dom');

goog.require('goog.userAgent');
goog.require('ol');
goog.require('ol.vec.Mat4');


/**
 * @type {Array.<number>}
 * @private
 */
ol.dom.tmpMat4_ = ol.vec.Mat4.create();


/**
 * Create an html canvas element and returns its 2d context.
 * @param {number=} opt_width Canvas width.
 * @param {number=} opt_height Canvas height.
 * @return {CanvasRenderingContext2D} The context.
 */
ol.dom.createCanvasContext2D = function(opt_width, opt_height) {
  var canvas = document.createElement('CANVAS');
  if (opt_width) {
    canvas.width = opt_width;
  }
  if (opt_height) {
    canvas.height = opt_height;
  }
  return canvas.getContext('2d');
};


/**
 * Detect 2d transform.
 * Adapted from http://stackoverflow.com/q/5661671/130442
 * http://caniuse.com/#feat=transforms2d
 * @return {boolean}
 */
ol.dom.canUseCssTransform = (function() {
  var canUseCssTransform;
  return function() {
    if (canUseCssTransform === undefined) {
      var el = document.createElement('P'),
          has2d,
          transforms = {
            'webkitTransform': '-webkit-transform',
            'OTransform': '-o-transform',
            'msTransform': '-ms-transform',
            'MozTransform': '-moz-transform',
            'transform': 'transform'
          };
      document.body.appendChild(el);
      for (var t in transforms) {
        if (t in el.style) {
          el.style[t] = 'translate(1px,1px)';
          has2d = ol.global.getComputedStyle(el).getPropertyValue(
              transforms[t]);
        }
      }
      document.body.removeChild(el);

      canUseCssTransform = (has2d && has2d !== 'none');
    }
    return canUseCssTransform;
  };
}());


/**
 * Detect 3d transform.
 * Adapted from http://stackoverflow.com/q/5661671/130442
 * http://caniuse.com/#feat=transforms3d
 * @return {boolean}
 */
ol.dom.canUseCssTransform3D = (function() {
  var canUseCssTransform3D;
  return function() {
    if (canUseCssTransform3D === undefined) {
      var el = document.createElement('P'),
          has3d,
          transforms = {
            'webkitTransform': '-webkit-transform',
            'OTransform': '-o-transform',
            'msTransform': '-ms-transform',
            'MozTransform': '-moz-transform',
            'transform': 'transform'
          };
      document.body.appendChild(el);
      for (var t in transforms) {
        if (t in el.style) {
          el.style[t] = 'translate3d(1px,1px,1px)';
          has3d = ol.global.getComputedStyle(el).getPropertyValue(
              transforms[t]);
        }
      }
      document.body.removeChild(el);

      canUseCssTransform3D = (has3d && has3d !== 'none');
    }
    return canUseCssTransform3D;
  };
}());


/**
 * @param {Element} element Element.
 * @param {string} value Value.
 */
ol.dom.setTransform = function(element, value) {
  var style = element.style;
  style.WebkitTransform = value;
  style.MozTransform = value;
  style.OTransform = value;
  style.msTransform = value;
  style.transform = value;

  // IE 9+ seems to assume transform-origin: 100% 100%; for some unknown reason
  if (goog.userAgent.IE && goog.userAgent.isVersionOrHigher('9.0')) {
    element.style.transformOrigin = '0 0';
  }
};


/**
 * @param {!Element} element Element.
 * @param {ol.Transform} transform Matrix.
 * @param {number=} opt_precision Precision.
 */
ol.dom.transformElement2D = function(element, transform, opt_precision) {
  // using matrix() causes gaps in Chrome and Firefox on Mac OS X, so prefer
  // matrix3d()
  var i;
  if (ol.dom.canUseCssTransform3D()) {
    var value3D;
    var transform3D = ol.vec.Mat4.fromTransform(ol.dom.tmpMat4_, transform);
    if (opt_precision !== undefined) {
      /** @type {Array.<string>} */
      var strings3D = new Array(16);
      for (i = 0; i < 16; ++i) {
        strings3D[i] = transform3D[i].toFixed(opt_precision);
      }
      value3D = strings3D.join(',');
    } else {
      value3D = transform3D.join(',');
    }
    ol.dom.setTransform(element, 'matrix3d(' + value3D + ')');
  } else if (ol.dom.canUseCssTransform()) {
    /** @type {string} */
    var value2D;
    if (opt_precision !== undefined) {
      /** @type {Array.<string>} */
      var strings2D = new Array(6);
      for (i = 0; i < 6; ++i) {
        strings2D[i] = transform[i].toFixed(opt_precision);
      }
      value2D = strings2D.join(',');
    } else {
      value2D = transform.join(',');
    }
    ol.dom.setTransform(element, 'matrix(' + value2D + ')');
  } else {
    element.style.left = Math.round(transform[4]) + 'px';
    element.style.top = Math.round(transform[5]) + 'px';

    // TODO: Add scaling here. This isn't quite as simple as multiplying
    // width/height, because that only changes the container size, not the
    // content size.
  }
};


/**
 * Get the current computed width for the given element including margin,
 * padding and border.
 * Equivalent to jQuery's `$(el).outerWidth(true)`.
 * @param {!Element} element Element.
 * @return {number} The width.
 */
ol.dom.outerWidth = function(element) {
  var width = element.offsetWidth;
  var style = element.currentStyle || ol.global.getComputedStyle(element);
  width += parseInt(style.marginLeft, 10) + parseInt(style.marginRight, 10);

  return width;
};


/**
 * Get the current computed height for the given element including margin,
 * padding and border.
 * Equivalent to jQuery's `$(el).outerHeight(true)`.
 * @param {!Element} element Element.
 * @return {number} The height.
 */
ol.dom.outerHeight = function(element) {
  var height = element.offsetHeight;
  var style = element.currentStyle || ol.global.getComputedStyle(element);
  height += parseInt(style.marginTop, 10) + parseInt(style.marginBottom, 10);

  return height;
};

/**
 * @param {Node} newNode Node to replace old node
 * @param {Node} oldNode The node to be replaced
 */
ol.dom.replaceNode = function(newNode, oldNode) {
  var parent = oldNode.parentNode;
  if (parent) {
    parent.replaceChild(newNode, oldNode);
  }
};

/**
 * @param {Node} node The node to remove.
 * @returns {Node} The node that was removed or null.
 */
ol.dom.removeNode = function(node) {
  return node && node.parentNode ? node.parentNode.removeChild(node) : null;
};

/**
 * @param {Node} node The node to remove the children from.
 */
ol.dom.removeChildren = function(node) {
  while (node.lastChild) {
    node.removeChild(node.lastChild);
  }
};

goog.provide('ol.MapEvent');
goog.provide('ol.MapEventType');

goog.require('ol');
goog.require('ol.events.Event');


/**
 * @enum {string}
 */
ol.MapEventType = {

  /**
   * Triggered after a map frame is rendered.
   * @event ol.MapEvent#postrender
   * @api
   */
  POSTRENDER: 'postrender',

  /**
   * Triggered after the map is moved.
   * @event ol.MapEvent#moveend
   * @api stable
   */
  MOVEEND: 'moveend'

};


/**
 * @classdesc
 * Events emitted as map events are instances of this type.
 * See {@link ol.Map} for which events trigger a map event.
 *
 * @constructor
 * @extends {ol.events.Event}
 * @implements {oli.MapEvent}
 * @param {string} type Event type.
 * @param {ol.Map} map Map.
 * @param {?olx.FrameState=} opt_frameState Frame state.
 */
ol.MapEvent = function(type, map, opt_frameState) {

  ol.events.Event.call(this, type);

  /**
   * The map where the event occurred.
   * @type {ol.Map}
   * @api stable
   */
  this.map = map;

  /**
   * The frame state at the time of the event.
   * @type {?olx.FrameState}
   * @api
   */
  this.frameState = opt_frameState !== undefined ? opt_frameState : null;

};
ol.inherits(ol.MapEvent, ol.events.Event);

goog.provide('ol.control.Control');

goog.require('ol.events');
goog.require('ol');
goog.require('ol.MapEventType');
goog.require('ol.Object');
goog.require('ol.dom');


/**
 * @classdesc
 * A control is a visible widget with a DOM element in a fixed position on the
 * screen. They can involve user input (buttons), or be informational only;
 * the position is determined using CSS. By default these are placed in the
 * container with CSS class name `ol-overlaycontainer-stopevent`, but can use
 * any outside DOM element.
 *
 * This is the base class for controls. You can use it for simple custom
 * controls by creating the element with listeners, creating an instance:
 * ```js
 * var myControl = new ol.control.Control({element: myElement});
 * ```
 * and then adding this to the map.
 *
 * The main advantage of having this as a control rather than a simple separate
 * DOM element is that preventing propagation is handled for you. Controls
 * will also be `ol.Object`s in a `ol.Collection`, so you can use their
 * methods.
 *
 * You can also extend this base for your own control class. See
 * examples/custom-controls for an example of how to do this.
 *
 * @constructor
 * @extends {ol.Object}
 * @implements {oli.control.Control}
 * @param {olx.control.ControlOptions} options Control options.
 * @api stable
 */
ol.control.Control = function(options) {

  ol.Object.call(this);

  /**
   * @protected
   * @type {Element}
   */
  this.element = options.element ? options.element : null;

  /**
   * @private
   * @type {Element}
   */
  this.target_ = null;

  /**
   * @private
   * @type {ol.Map}
   */
  this.map_ = null;

  /**
   * @protected
   * @type {!Array.<ol.EventsKey>}
   */
  this.listenerKeys = [];

  /**
   * @type {function(ol.MapEvent)}
   */
  this.render = options.render ? options.render : ol.nullFunction;

  if (options.target) {
    this.setTarget(options.target);
  }

};
ol.inherits(ol.control.Control, ol.Object);


/**
 * @inheritDoc
 */
ol.control.Control.prototype.disposeInternal = function() {
  ol.dom.removeNode(this.element);
  ol.Object.prototype.disposeInternal.call(this);
};


/**
 * Get the map associated with this control.
 * @return {ol.Map} Map.
 * @api stable
 */
ol.control.Control.prototype.getMap = function() {
  return this.map_;
};


/**
 * Remove the control from its current map and attach it to the new map.
 * Subclasses may set up event handlers to get notified about changes to
 * the map here.
 * @param {ol.Map} map Map.
 * @api stable
 */
ol.control.Control.prototype.setMap = function(map) {
  if (this.map_) {
    ol.dom.removeNode(this.element);
  }
  for (var i = 0, ii = this.listenerKeys.length; i < ii; ++i) {
    ol.events.unlistenByKey(this.listenerKeys[i]);
  }
  this.listenerKeys.length = 0;
  this.map_ = map;
  if (this.map_) {
    var target = this.target_ ?
        this.target_ : map.getOverlayContainerStopEvent();
    target.appendChild(this.element);
    if (this.render !== ol.nullFunction) {
      this.listenerKeys.push(ol.events.listen(map,
          ol.MapEventType.POSTRENDER, this.render, this));
    }
    map.render();
  }
};


/**
 * This function is used to set a target element for the control. It has no
 * effect if it is called after the control has been added to the map (i.e.
 * after `setMap` is called on the control). If no `target` is set in the
 * options passed to the control constructor and if `setTarget` is not called
 * then the control is added to the map's overlay container.
 * @param {Element|string} target Target.
 * @api
 */
ol.control.Control.prototype.setTarget = function(target) {
  this.target_ = typeof target === 'string' ?
    document.getElementById(target) :
    target;
};

goog.provide('ol.css');


/**
 * The CSS class for hidden feature.
 *
 * @const
 * @type {string}
 */
ol.css.CLASS_HIDDEN = 'ol-hidden';


/**
 * The CSS class that we'll give the DOM elements to have them unselectable.
 *
 * @const
 * @type {string}
 */
ol.css.CLASS_UNSELECTABLE = 'ol-unselectable';


/**
 * The CSS class for unsupported feature.
 *
 * @const
 * @type {string}
 */
ol.css.CLASS_UNSUPPORTED = 'ol-unsupported';


/**
 * The CSS class for controls.
 *
 * @const
 * @type {string}
 */
ol.css.CLASS_CONTROL = 'ol-control';

// FIXME handle date line wrap

goog.provide('ol.control.Attribution');

goog.require('ol');
goog.require('ol.dom');
goog.require('ol.control.Control');
goog.require('ol.css');
goog.require('ol.events');
goog.require('ol.events.EventType');
goog.require('ol.obj');


/**
 * @classdesc
 * Control to show all the attributions associated with the layer sources
 * in the map. This control is one of the default controls included in maps.
 * By default it will show in the bottom right portion of the map, but this can
 * be changed by using a css selector for `.ol-attribution`.
 *
 * @constructor
 * @extends {ol.control.Control}
 * @param {olx.control.AttributionOptions=} opt_options Attribution options.
 * @api stable
 */
ol.control.Attribution = function(opt_options) {

  var options = opt_options ? opt_options : {};

  /**
   * @private
   * @type {Element}
   */
  this.ulElement_ = document.createElement('UL');

  /**
   * @private
   * @type {Element}
   */
  this.logoLi_ = document.createElement('LI');

  this.ulElement_.appendChild(this.logoLi_);
  this.logoLi_.style.display = 'none';

  /**
   * @private
   * @type {boolean}
   */
  this.collapsed_ = options.collapsed !== undefined ? options.collapsed : true;

  /**
   * @private
   * @type {boolean}
   */
  this.collapsible_ = options.collapsible !== undefined ?
      options.collapsible : true;

  if (!this.collapsible_) {
    this.collapsed_ = false;
  }

  var className = options.className !== undefined ? options.className : 'ol-attribution';

  var tipLabel = options.tipLabel !== undefined ? options.tipLabel : 'Attributions';

  var collapseLabel = options.collapseLabel !== undefined ? options.collapseLabel : '\u00BB';

  if (typeof collapseLabel === 'string') {
    /**
     * @private
     * @type {Node}
     */
    this.collapseLabel_ = document.createElement('span');
    this.collapseLabel_.textContent = collapseLabel;
  } else {
    this.collapseLabel_ = collapseLabel;
  }

  var label = options.label !== undefined ? options.label : 'i';

  if (typeof label === 'string') {
    /**
     * @private
     * @type {Node}
     */
    this.label_ = document.createElement('span');
    this.label_.textContent = label;
  } else {
    this.label_ = label;
  }


  var activeLabel = (this.collapsible_ && !this.collapsed_) ?
      this.collapseLabel_ : this.label_;
  var button = document.createElement('button');
  button.setAttribute('type', 'button');
  button.title = tipLabel;
  button.appendChild(activeLabel);

  ol.events.listen(button, ol.events.EventType.CLICK, this.handleClick_, this);

  var cssClasses = className + ' ' + ol.css.CLASS_UNSELECTABLE + ' ' +
      ol.css.CLASS_CONTROL +
      (this.collapsed_ && this.collapsible_ ? ' ol-collapsed' : '') +
      (this.collapsible_ ? '' : ' ol-uncollapsible');
  var element = document.createElement('div');
  element.className = cssClasses;
  element.appendChild(this.ulElement_);
  element.appendChild(button);

  var render = options.render ? options.render : ol.control.Attribution.render;

  ol.control.Control.call(this, {
    element: element,
    render: render,
    target: options.target
  });

  /**
   * @private
   * @type {boolean}
   */
  this.renderedVisible_ = true;

  /**
   * @private
   * @type {Object.<string, Element>}
   */
  this.attributionElements_ = {};

  /**
   * @private
   * @type {Object.<string, boolean>}
   */
  this.attributionElementRenderedVisible_ = {};

  /**
   * @private
   * @type {Object.<string, Element>}
   */
  this.logoElements_ = {};

};
ol.inherits(ol.control.Attribution, ol.control.Control);


/**
 * @param {?olx.FrameState} frameState Frame state.
 * @return {Array.<Object.<string, ol.Attribution>>} Attributions.
 */
ol.control.Attribution.prototype.getSourceAttributions = function(frameState) {
  var i, ii, j, jj, tileRanges, source, sourceAttribution,
      sourceAttributionKey, sourceAttributions, sourceKey;
  var intersectsTileRange;
  var layerStatesArray = frameState.layerStatesArray;
  /** @type {Object.<string, ol.Attribution>} */
  var attributions = ol.obj.assign({}, frameState.attributions);
  /** @type {Object.<string, ol.Attribution>} */
  var hiddenAttributions = {};
  var projection = /** @type {!ol.proj.Projection} */ (frameState.viewState.projection);
  for (i = 0, ii = layerStatesArray.length; i < ii; i++) {
    source = layerStatesArray[i].layer.getSource();
    if (!source) {
      continue;
    }
    sourceKey = ol.getUid(source).toString();
    sourceAttributions = source.getAttributions();
    if (!sourceAttributions) {
      continue;
    }
    for (j = 0, jj = sourceAttributions.length; j < jj; j++) {
      sourceAttribution = sourceAttributions[j];
      sourceAttributionKey = ol.getUid(sourceAttribution).toString();
      if (sourceAttributionKey in attributions) {
        continue;
      }
      tileRanges = frameState.usedTiles[sourceKey];
      if (tileRanges) {
        var tileGrid = /** @type {ol.source.Tile} */ (source).getTileGridForProjection(projection);
        intersectsTileRange = sourceAttribution.intersectsAnyTileRange(
            tileRanges, tileGrid, projection);
      } else {
        intersectsTileRange = false;
      }
      if (intersectsTileRange) {
        if (sourceAttributionKey in hiddenAttributions) {
          delete hiddenAttributions[sourceAttributionKey];
        }
        attributions[sourceAttributionKey] = sourceAttribution;
      } else {
        hiddenAttributions[sourceAttributionKey] = sourceAttribution;
      }
    }
  }
  return [attributions, hiddenAttributions];
};


/**
 * Update the attribution element.
 * @param {ol.MapEvent} mapEvent Map event.
 * @this {ol.control.Attribution}
 * @api
 */
ol.control.Attribution.render = function(mapEvent) {
  this.updateElement_(mapEvent.frameState);
};


/**
 * @private
 * @param {?olx.FrameState} frameState Frame state.
 */
ol.control.Attribution.prototype.updateElement_ = function(frameState) {

  if (!frameState) {
    if (this.renderedVisible_) {
      this.element.style.display = 'none';
      this.renderedVisible_ = false;
    }
    return;
  }

  var attributions = this.getSourceAttributions(frameState);
  /** @type {Object.<string, ol.Attribution>} */
  var visibleAttributions = attributions[0];
  /** @type {Object.<string, ol.Attribution>} */
  var hiddenAttributions = attributions[1];

  var attributionElement, attributionKey;
  for (attributionKey in this.attributionElements_) {
    if (attributionKey in visibleAttributions) {
      if (!this.attributionElementRenderedVisible_[attributionKey]) {
        this.attributionElements_[attributionKey].style.display = '';
        this.attributionElementRenderedVisible_[attributionKey] = true;
      }
      delete visibleAttributions[attributionKey];
    } else if (attributionKey in hiddenAttributions) {
      if (this.attributionElementRenderedVisible_[attributionKey]) {
        this.attributionElements_[attributionKey].style.display = 'none';
        delete this.attributionElementRenderedVisible_[attributionKey];
      }
      delete hiddenAttributions[attributionKey];
    } else {
      ol.dom.removeNode(this.attributionElements_[attributionKey]);
      delete this.attributionElements_[attributionKey];
      delete this.attributionElementRenderedVisible_[attributionKey];
    }
  }
  for (attributionKey in visibleAttributions) {
    attributionElement = document.createElement('LI');
    attributionElement.innerHTML =
        visibleAttributions[attributionKey].getHTML();
    this.ulElement_.appendChild(attributionElement);
    this.attributionElements_[attributionKey] = attributionElement;
    this.attributionElementRenderedVisible_[attributionKey] = true;
  }
  for (attributionKey in hiddenAttributions) {
    attributionElement = document.createElement('LI');
    attributionElement.innerHTML =
        hiddenAttributions[attributionKey].getHTML();
    attributionElement.style.display = 'none';
    this.ulElement_.appendChild(attributionElement);
    this.attributionElements_[attributionKey] = attributionElement;
  }

  var renderVisible =
      !ol.obj.isEmpty(this.attributionElementRenderedVisible_) ||
      !ol.obj.isEmpty(frameState.logos);
  if (this.renderedVisible_ != renderVisible) {
    this.element.style.display = renderVisible ? '' : 'none';
    this.renderedVisible_ = renderVisible;
  }
  if (renderVisible &&
      ol.obj.isEmpty(this.attributionElementRenderedVisible_)) {
    this.element.classList.add('ol-logo-only');
  } else {
    this.element.classList.remove('ol-logo-only');
  }

  this.insertLogos_(frameState);

};


/**
 * @param {?olx.FrameState} frameState Frame state.
 * @private
 */
ol.control.Attribution.prototype.insertLogos_ = function(frameState) {

  var logo;
  var logos = frameState.logos;
  var logoElements = this.logoElements_;

  for (logo in logoElements) {
    if (!(logo in logos)) {
      ol.dom.removeNode(logoElements[logo]);
      delete logoElements[logo];
    }
  }

  var image, logoElement, logoKey;
  for (logoKey in logos) {
    var logoValue = logos[logoKey];
    if (logoValue instanceof HTMLElement) {
      this.logoLi_.appendChild(logoValue);
      logoElements[logoKey] = logoValue;
    }
    if (!(logoKey in logoElements)) {
      image = new Image();
      image.src = logoKey;
      if (logoValue === '') {
        logoElement = image;
      } else {
        logoElement = document.createElement('a');
        logoElement.href = logoValue;
        logoElement.appendChild(image);
      }
      this.logoLi_.appendChild(logoElement);
      logoElements[logoKey] = logoElement;
    }
  }

  this.logoLi_.style.display = !ol.obj.isEmpty(logos) ? '' : 'none';

};


/**
 * @param {Event} event The event to handle
 * @private
 */
ol.control.Attribution.prototype.handleClick_ = function(event) {
  event.preventDefault();
  this.handleToggle_();
};


/**
 * @private
 */
ol.control.Attribution.prototype.handleToggle_ = function() {
  this.element.classList.toggle('ol-collapsed');
  if (this.collapsed_) {
    ol.dom.replaceNode(this.collapseLabel_, this.label_);
  } else {
    ol.dom.replaceNode(this.label_, this.collapseLabel_);
  }
  this.collapsed_ = !this.collapsed_;
};


/**
 * Return `true` if the attribution is collapsible, `false` otherwise.
 * @return {boolean} True if the widget is collapsible.
 * @api stable
 */
ol.control.Attribution.prototype.getCollapsible = function() {
  return this.collapsible_;
};


/**
 * Set whether the attribution should be collapsible.
 * @param {boolean} collapsible True if the widget is collapsible.
 * @api stable
 */
ol.control.Attribution.prototype.setCollapsible = function(collapsible) {
  if (this.collapsible_ === collapsible) {
    return;
  }
  this.collapsible_ = collapsible;
  this.element.classList.toggle('ol-uncollapsible');
  if (!collapsible && this.collapsed_) {
    this.handleToggle_();
  }
};


/**
 * Collapse or expand the attribution according to the passed parameter. Will
 * not do anything if the attribution isn't collapsible or if the current
 * collapsed state is already the one requested.
 * @param {boolean} collapsed True if the widget is collapsed.
 * @api stable
 */
ol.control.Attribution.prototype.setCollapsed = function(collapsed) {
  if (!this.collapsible_ || this.collapsed_ === collapsed) {
    return;
  }
  this.handleToggle_();
};


/**
 * Return `true` when the attribution is currently collapsed or `false`
 * otherwise.
 * @return {boolean} True if the widget is collapsed.
 * @api stable
 */
ol.control.Attribution.prototype.getCollapsed = function() {
  return this.collapsed_;
};

goog.provide('ol.control.FullScreen');

goog.require('ol.events');
goog.require('ol.events.EventType');
goog.require('ol');
goog.require('ol.control.Control');
goog.require('ol.dom');
goog.require('ol.css');


/**
 * @classdesc
 * Provides a button that when clicked fills up the full screen with the map.
 * The full screen source element is by default the element containing the map viewport unless
 * overriden by providing the `source` option. In which case, the dom
 * element introduced using this parameter will be displayed in full screen.
 *
 * When in full screen mode, a close button is shown to exit full screen mode.
 * The [Fullscreen API](http://www.w3.org/TR/fullscreen/) is used to
 * toggle the map in full screen mode.
 *
 *
 * @constructor
 * @extends {ol.control.Control}
 * @param {olx.control.FullScreenOptions=} opt_options Options.
 * @api stable
 */
ol.control.FullScreen = function(opt_options) {

  var options = opt_options ? opt_options : {};

  /**
   * @private
   * @type {string}
   */
  this.cssClassName_ = options.className !== undefined ? options.className :
      'ol-full-screen';

  var label = options.label !== undefined ? options.label : '\u2922';

  /**
   * @private
   * @type {Node}
   */
  this.labelNode_ = typeof label === 'string' ?
      document.createTextNode(label) : label;

  var labelActive = options.labelActive !== undefined ? options.labelActive : '\u00d7';

  /**
   * @private
   * @type {Node}
   */
  this.labelActiveNode_ = typeof labelActive === 'string' ?
      document.createTextNode(labelActive) : labelActive;

  var tipLabel = options.tipLabel ? options.tipLabel : 'Toggle full-screen';
  var button = document.createElement('button');
  button.className = this.cssClassName_ + '-' + ol.control.FullScreen.isFullScreen();
  button.setAttribute('type', 'button');
  button.title = tipLabel;
  button.appendChild(this.labelNode_);

  ol.events.listen(button, ol.events.EventType.CLICK,
      this.handleClick_, this);

  var cssClasses = this.cssClassName_ + ' ' + ol.css.CLASS_UNSELECTABLE +
      ' ' + ol.css.CLASS_CONTROL + ' ' +
      (!ol.control.FullScreen.isFullScreenSupported() ? ol.css.CLASS_UNSUPPORTED : '');
  var element = document.createElement('div');
  element.className = cssClasses;
  element.appendChild(button);

  ol.control.Control.call(this, {
    element: element,
    target: options.target
  });

  /**
   * @private
   * @type {boolean}
   */
  this.keys_ = options.keys !== undefined ? options.keys : false;

  /**
   * @private
   * @type {Element|string|undefined}
   */
  this.source_ = options.source;

};
ol.inherits(ol.control.FullScreen, ol.control.Control);


/**
 * @param {Event} event The event to handle
 * @private
 */
ol.control.FullScreen.prototype.handleClick_ = function(event) {
  event.preventDefault();
  this.handleFullScreen_();
};


/**
 * @private
 */
ol.control.FullScreen.prototype.handleFullScreen_ = function() {
  if (!ol.control.FullScreen.isFullScreenSupported()) {
    return;
  }
  var map = this.getMap();
  if (!map) {
    return;
  }
  if (ol.control.FullScreen.isFullScreen()) {
    ol.control.FullScreen.exitFullScreen();
  } else {
    var element;
    if (this.source_) {
      element = typeof this.source_ === 'string' ?
        document.getElementById(this.source_) :
        this.source_;
    } else {
      element = map.getTargetElement();
    }
    if (this.keys_) {
      ol.control.FullScreen.requestFullScreenWithKeys(element);

    } else {
      ol.control.FullScreen.requestFullScreen(element);
    }
  }
};


/**
 * @private
 */
ol.control.FullScreen.prototype.handleFullScreenChange_ = function() {
  var button = this.element.firstElementChild;
  var map = this.getMap();
  if (ol.control.FullScreen.isFullScreen()) {
    button.className = this.cssClassName_ + '-true';
    ol.dom.replaceNode(this.labelActiveNode_, this.labelNode_);
  } else {
    button.className = this.cssClassName_ + '-false';
    ol.dom.replaceNode(this.labelNode_, this.labelActiveNode_);
  }
  if (map) {
    map.updateSize();
  }
};


/**
 * @inheritDoc
 * @api stable
 */
ol.control.FullScreen.prototype.setMap = function(map) {
  ol.control.Control.prototype.setMap.call(this, map);
  if (map) {
    this.listenerKeys.push(ol.events.listen(ol.global.document,
        ol.control.FullScreen.getChangeType_(),
        this.handleFullScreenChange_, this)
    );
  }
};

/**
 * @return {boolean} Fullscreen is supported by the current platform.
 */
ol.control.FullScreen.isFullScreenSupported = function() {
  var body = document.body;
  return !!(
    body.webkitRequestFullscreen ||
    (body.mozRequestFullScreen && document.mozFullScreenEnabled) ||
    (body.msRequestFullscreen && document.msFullscreenEnabled) ||
    (body.requestFullscreen && document.fullscreenEnabled)
  );
};

/**
 * @return {boolean} Element is currently in fullscreen.
 */
ol.control.FullScreen.isFullScreen = function() {
  return !!(
    document.webkitIsFullScreen || document.mozFullScreen ||
    document.msFullscreenElement || document.fullscreenElement
  );
};

/**
 * Request to fullscreen an element.
 * @param {Node} element Element to request fullscreen
 */
ol.control.FullScreen.requestFullScreen = function(element) {
  if (element.requestFullscreen) {
    element.requestFullscreen();
  } else if (element.msRequestFullscreen) {
    element.msRequestFullscreen();
  } else if (element.mozRequestFullScreen) {
    element.mozRequestFullScreen();
  } else if (element.webkitRequestFullscreen) {
    element.webkitRequestFullscreen();
  }
};

/**
 * Request to fullscreen an element with keyboard input.
 * @param {Node} element Element to request fullscreen
 */
ol.control.FullScreen.requestFullScreenWithKeys = function(element) {
  if (element.mozRequestFullScreenWithKeys) {
    element.mozRequestFullScreenWithKeys();
  } else if (element.webkitRequestFullscreen) {
    element.webkitRequestFullscreen(Element.ALLOW_KEYBOARD_INPUT);
  } else {
    ol.control.FullScreen.requestFullScreen(element);
  }
};

/**
 * Exit fullscreen.
 */
ol.control.FullScreen.exitFullScreen = function() {
  if (document.exitFullscreen) {
    document.exitFullscreen();
  } else if (document.msExitFullscreen) {
    document.msExitFullscreen();
  } else if (document.mozCancelFullScreen) {
    document.mozCancelFullScreen();
  } else if (document.webkitExitFullscreen) {
    document.webkitExitFullscreen();
  }
};

/**
 * @return {string} Change type.
 * @private
 */
ol.control.FullScreen.getChangeType_ = (function() {
  var changeType;
  return function() {
    if (!changeType) {
      var body = document.body;
      if (body.webkitRequestFullscreen) {
        changeType = 'webkitfullscreenchange';
      } else if (body.mozRequestFullScreen) {
        changeType = 'mozfullscreenchange';
      } else if (body.msRequestFullscreen) {
        changeType = 'MSFullscreenChange';
      } else if (body.requestFullscreen) {
        changeType = 'fullscreenchange';
      }
    }
    return changeType;
  };
})();

goog.provide('ol.control.Rotate');

goog.require('ol.events');
goog.require('ol.events.EventType');
goog.require('ol');
goog.require('ol.animation');
goog.require('ol.control.Control');
goog.require('ol.css');
goog.require('ol.easing');


/**
 * @classdesc
 * A button control to reset rotation to 0.
 * To style this control use css selector `.ol-rotate`. A `.ol-hidden` css
 * selector is added to the button when the rotation is 0.
 *
 * @constructor
 * @extends {ol.control.Control}
 * @param {olx.control.RotateOptions=} opt_options Rotate options.
 * @api stable
 */
ol.control.Rotate = function(opt_options) {

  var options = opt_options ? opt_options : {};

  var className = options.className !== undefined ? options.className : 'ol-rotate';

  var label = options.label !== undefined ? options.label : '\u21E7';

  /**
   * @type {Element}
   * @private
   */
  this.label_ = null;

  if (typeof label === 'string') {
    this.label_ = document.createElement('span');
    this.label_.className = 'ol-compass';
    this.label_.textContent = label;
  } else {
    this.label_ = label;
    this.label_.classList.add('ol-compass');
  }

  var tipLabel = options.tipLabel ? options.tipLabel : 'Reset rotation';

  var button = document.createElement('button');
  button.className = className + '-reset';
  button.setAttribute('type', 'button');
  button.title = tipLabel;
  button.appendChild(this.label_);

  ol.events.listen(button, ol.events.EventType.CLICK,
      ol.control.Rotate.prototype.handleClick_, this);

  var cssClasses = className + ' ' + ol.css.CLASS_UNSELECTABLE + ' ' +
      ol.css.CLASS_CONTROL;
  var element = document.createElement('div');
  element.className = cssClasses;
  element.appendChild(button);

  var render = options.render ? options.render : ol.control.Rotate.render;

  this.callResetNorth_ = options.resetNorth ? options.resetNorth : undefined;

  ol.control.Control.call(this, {
    element: element,
    render: render,
    target: options.target
  });

  /**
   * @type {number}
   * @private
   */
  this.duration_ = options.duration !== undefined ? options.duration : 250;

  /**
   * @type {boolean}
   * @private
   */
  this.autoHide_ = options.autoHide !== undefined ? options.autoHide : true;

  /**
   * @private
   * @type {number|undefined}
   */
  this.rotation_ = undefined;

  if (this.autoHide_) {
    this.element.classList.add(ol.css.CLASS_HIDDEN);
  }

};
ol.inherits(ol.control.Rotate, ol.control.Control);


/**
 * @param {Event} event The event to handle
 * @private
 */
ol.control.Rotate.prototype.handleClick_ = function(event) {
  event.preventDefault();
  if (this.callResetNorth_ !== undefined) {
    this.callResetNorth_();
  } else {
    this.resetNorth_();
  }
};


/**
 * @private
 */
ol.control.Rotate.prototype.resetNorth_ = function() {
  var map = this.getMap();
  var view = map.getView();
  if (!view) {
    // the map does not have a view, so we can't act
    // upon it
    return;
  }
  var currentRotation = view.getRotation();
  if (currentRotation !== undefined) {
    if (this.duration_ > 0) {
      currentRotation = currentRotation % (2 * Math.PI);
      if (currentRotation < -Math.PI) {
        currentRotation += 2 * Math.PI;
      }
      if (currentRotation > Math.PI) {
        currentRotation -= 2 * Math.PI;
      }
      map.beforeRender(ol.animation.rotate({
        rotation: currentRotation,
        duration: this.duration_,
        easing: ol.easing.easeOut
      }));
    }
    view.setRotation(0);
  }
};


/**
 * Update the rotate control element.
 * @param {ol.MapEvent} mapEvent Map event.
 * @this {ol.control.Rotate}
 * @api
 */
ol.control.Rotate.render = function(mapEvent) {
  var frameState = mapEvent.frameState;
  if (!frameState) {
    return;
  }
  var rotation = frameState.viewState.rotation;
  if (rotation != this.rotation_) {
    var transform = 'rotate(' + rotation + 'rad)';
    if (this.autoHide_) {
      var contains = this.element.classList.contains(ol.css.CLASS_HIDDEN);
      if (!contains && rotation === 0) {
        this.element.classList.add(ol.css.CLASS_HIDDEN);
      } else if (contains && rotation !== 0) {
        this.element.classList.remove(ol.css.CLASS_HIDDEN);
      }
    }
    this.label_.style.msTransform = transform;
    this.label_.style.webkitTransform = transform;
    this.label_.style.transform = transform;
  }
  this.rotation_ = rotation;
};

goog.provide('ol.control.Zoom');

goog.require('ol');
goog.require('ol.events');
goog.require('ol.events.EventType');
goog.require('ol.animation');
goog.require('ol.control.Control');
goog.require('ol.css');
goog.require('ol.easing');


/**
 * @classdesc
 * A control with 2 buttons, one for zoom in and one for zoom out.
 * This control is one of the default controls of a map. To style this control
 * use css selectors `.ol-zoom-in` and `.ol-zoom-out`.
 *
 * @constructor
 * @extends {ol.control.Control}
 * @param {olx.control.ZoomOptions=} opt_options Zoom options.
 * @api stable
 */
ol.control.Zoom = function(opt_options) {

  var options = opt_options ? opt_options : {};

  var className = options.className !== undefined ? options.className : 'ol-zoom';

  var delta = options.delta !== undefined ? options.delta : 1;

  var zoomInLabel = options.zoomInLabel !== undefined ? options.zoomInLabel : '+';
  var zoomOutLabel = options.zoomOutLabel !== undefined ? options.zoomOutLabel : '\u2212';

  var zoomInTipLabel = options.zoomInTipLabel !== undefined ?
      options.zoomInTipLabel : 'Zoom in';
  var zoomOutTipLabel = options.zoomOutTipLabel !== undefined ?
      options.zoomOutTipLabel : 'Zoom out';

  var inElement = document.createElement('button');
  inElement.className = className + '-in';
  inElement.setAttribute('type', 'button');
  inElement.title = zoomInTipLabel;
  inElement.appendChild(
    typeof zoomInLabel === 'string' ? document.createTextNode(zoomInLabel) : zoomInLabel
  );

  ol.events.listen(inElement, ol.events.EventType.CLICK,
      ol.control.Zoom.prototype.handleClick_.bind(this, delta));

  var outElement = document.createElement('button');
  outElement.className = className + '-out';
  outElement.setAttribute('type', 'button');
  outElement.title = zoomOutTipLabel;
  outElement.appendChild(
    typeof zoomOutLabel === 'string' ? document.createTextNode(zoomOutLabel) : zoomOutLabel
  );

  ol.events.listen(outElement, ol.events.EventType.CLICK,
      ol.control.Zoom.prototype.handleClick_.bind(this, -delta));

  var cssClasses = className + ' ' + ol.css.CLASS_UNSELECTABLE + ' ' +
      ol.css.CLASS_CONTROL;
  var element = document.createElement('div');
  element.className = cssClasses;
  element.appendChild(inElement);
  element.appendChild(outElement);

  ol.control.Control.call(this, {
    element: element,
    target: options.target
  });

  /**
   * @type {number}
   * @private
   */
  this.duration_ = options.duration !== undefined ? options.duration : 250;

};
ol.inherits(ol.control.Zoom, ol.control.Control);


/**
 * @param {number} delta Zoom delta.
 * @param {Event} event The event to handle
 * @private
 */
ol.control.Zoom.prototype.handleClick_ = function(delta, event) {
  event.preventDefault();
  this.zoomByDelta_(delta);
};


/**
 * @param {number} delta Zoom delta.
 * @private
 */
ol.control.Zoom.prototype.zoomByDelta_ = function(delta) {
  var map = this.getMap();
  var view = map.getView();
  if (!view) {
    // the map does not have a view, so we can't act
    // upon it
    return;
  }
  var currentResolution = view.getResolution();
  if (currentResolution) {
    if (this.duration_ > 0) {
      map.beforeRender(ol.animation.zoom({
        resolution: currentResolution,
        duration: this.duration_,
        easing: ol.easing.easeOut
      }));
    }
    var newResolution = view.constrainResolution(currentResolution, delta);
    view.setResolution(newResolution);
  }
};

goog.provide('ol.control');

goog.require('ol');
goog.require('ol.Collection');
goog.require('ol.control.Attribution');
goog.require('ol.control.Rotate');
goog.require('ol.control.Zoom');


/**
 * Set of controls included in maps by default. Unless configured otherwise,
 * this returns a collection containing an instance of each of the following
 * controls:
 * * {@link ol.control.Zoom}
 * * {@link ol.control.Rotate}
 * * {@link ol.control.Attribution}
 *
 * @param {olx.control.DefaultsOptions=} opt_options Defaults options.
 * @return {ol.Collection.<ol.control.Control>} Controls.
 * @api stable
 */
ol.control.defaults = function(opt_options) {

  var options = opt_options ? opt_options : {};

  var controls = new ol.Collection();

  var zoomControl = options.zoom !== undefined ? options.zoom : true;
  if (zoomControl) {
    controls.push(new ol.control.Zoom(options.zoomOptions));
  }

  var rotateControl = options.rotate !== undefined ? options.rotate : true;
  if (rotateControl) {
    controls.push(new ol.control.Rotate(options.rotateOptions));
  }

  var attributionControl = options.attribution !== undefined ?
      options.attribution : true;
  if (attributionControl) {
    controls.push(new ol.control.Attribution(options.attributionOptions));
  }

  return controls;

};

// FIXME should listen on appropriate pane, once it is defined

goog.provide('ol.control.MousePosition');

goog.require('ol');
goog.require('ol.events');
goog.require('ol.events.EventType');
goog.require('ol.Object');
goog.require('ol.control.Control');
goog.require('ol.proj');


/**
 * @enum {string}
 */
ol.control.MousePositionProperty = {
  PROJECTION: 'projection',
  COORDINATE_FORMAT: 'coordinateFormat'
};


/**
 * @classdesc
 * A control to show the 2D coordinates of the mouse cursor. By default, these
 * are in the view projection, but can be in any supported projection.
 * By default the control is shown in the top right corner of the map, but this
 * can be changed by using the css selector `.ol-mouse-position`.
 *
 * @constructor
 * @extends {ol.control.Control}
 * @param {olx.control.MousePositionOptions=} opt_options Mouse position
 *     options.
 * @api stable
 */
ol.control.MousePosition = function(opt_options) {

  var options = opt_options ? opt_options : {};

  var element = document.createElement('DIV');
  element.className = options.className !== undefined ? options.className : 'ol-mouse-position';

  var render = options.render ?
      options.render : ol.control.MousePosition.render;

  ol.control.Control.call(this, {
    element: element,
    render: render,
    target: options.target
  });

  ol.events.listen(this,
      ol.Object.getChangeEventType(ol.control.MousePositionProperty.PROJECTION),
      this.handleProjectionChanged_, this);

  if (options.coordinateFormat) {
    this.setCoordinateFormat(options.coordinateFormat);
  }
  if (options.projection) {
    this.setProjection(ol.proj.get(options.projection));
  }

  /**
   * @private
   * @type {string}
   */
  this.undefinedHTML_ = options.undefinedHTML !== undefined ? options.undefinedHTML : '';

  /**
   * @private
   * @type {string}
   */
  this.renderedHTML_ = element.innerHTML;

  /**
   * @private
   * @type {ol.proj.Projection}
   */
  this.mapProjection_ = null;

  /**
   * @private
   * @type {?ol.TransformFunction}
   */
  this.transform_ = null;

  /**
   * @private
   * @type {ol.Pixel}
   */
  this.lastMouseMovePixel_ = null;

};
ol.inherits(ol.control.MousePosition, ol.control.Control);


/**
 * Update the mouseposition element.
 * @param {ol.MapEvent} mapEvent Map event.
 * @this {ol.control.MousePosition}
 * @api
 */
ol.control.MousePosition.render = function(mapEvent) {
  var frameState = mapEvent.frameState;
  if (!frameState) {
    this.mapProjection_ = null;
  } else {
    if (this.mapProjection_ != frameState.viewState.projection) {
      this.mapProjection_ = frameState.viewState.projection;
      this.transform_ = null;
    }
  }
  this.updateHTML_(this.lastMouseMovePixel_);
};


/**
 * @private
 */
ol.control.MousePosition.prototype.handleProjectionChanged_ = function() {
  this.transform_ = null;
};


/**
 * Return the coordinate format type used to render the current position or
 * undefined.
 * @return {ol.CoordinateFormatType|undefined} The format to render the current
 *     position in.
 * @observable
 * @api stable
 */
ol.control.MousePosition.prototype.getCoordinateFormat = function() {
  return /** @type {ol.CoordinateFormatType|undefined} */ (
      this.get(ol.control.MousePositionProperty.COORDINATE_FORMAT));
};


/**
 * Return the projection that is used to report the mouse position.
 * @return {ol.proj.Projection|undefined} The projection to report mouse
 *     position in.
 * @observable
 * @api stable
 */
ol.control.MousePosition.prototype.getProjection = function() {
  return /** @type {ol.proj.Projection|undefined} */ (
      this.get(ol.control.MousePositionProperty.PROJECTION));
};


/**
 * @param {Event} event Browser event.
 * @protected
 */
ol.control.MousePosition.prototype.handleMouseMove = function(event) {
  var map = this.getMap();
  this.lastMouseMovePixel_ = map.getEventPixel(event);
  this.updateHTML_(this.lastMouseMovePixel_);
};


/**
 * @param {Event} event Browser event.
 * @protected
 */
ol.control.MousePosition.prototype.handleMouseOut = function(event) {
  this.updateHTML_(null);
  this.lastMouseMovePixel_ = null;
};


/**
 * @inheritDoc
 * @api stable
 */
ol.control.MousePosition.prototype.setMap = function(map) {
  ol.control.Control.prototype.setMap.call(this, map);
  if (map) {
    var viewport = map.getViewport();
    this.listenerKeys.push(
        ol.events.listen(viewport, ol.events.EventType.MOUSEMOVE,
            this.handleMouseMove, this),
        ol.events.listen(viewport, ol.events.EventType.MOUSEOUT,
            this.handleMouseOut, this)
    );
  }
};


/**
 * Set the coordinate format type used to render the current position.
 * @param {ol.CoordinateFormatType} format The format to render the current
 *     position in.
 * @observable
 * @api stable
 */
ol.control.MousePosition.prototype.setCoordinateFormat = function(format) {
  this.set(ol.control.MousePositionProperty.COORDINATE_FORMAT, format);
};


/**
 * Set the projection that is used to report the mouse position.
 * @param {ol.proj.Projection} projection The projection to report mouse
 *     position in.
 * @observable
 * @api stable
 */
ol.control.MousePosition.prototype.setProjection = function(projection) {
  this.set(ol.control.MousePositionProperty.PROJECTION, projection);
};


/**
 * @param {?ol.Pixel} pixel Pixel.
 * @private
 */
ol.control.MousePosition.prototype.updateHTML_ = function(pixel) {
  var html = this.undefinedHTML_;
  if (pixel && this.mapProjection_) {
    if (!this.transform_) {
      var projection = this.getProjection();
      if (projection) {
        this.transform_ = ol.proj.getTransformFromProjections(
            this.mapProjection_, projection);
      } else {
        this.transform_ = ol.proj.identityTransform;
      }
    }
    var map = this.getMap();
    var coordinate = map.getCoordinateFromPixel(pixel);
    if (coordinate) {
      this.transform_(coordinate, coordinate);
      var coordinateFormat = this.getCoordinateFormat();
      if (coordinateFormat) {
        html = coordinateFormat(coordinate);
      } else {
        html = coordinate.toString();
      }
    }
  }
  if (!this.renderedHTML_ || html != this.renderedHTML_) {
    this.element.innerHTML = html;
    this.renderedHTML_ = html;
  }
};

// Copyright 2010 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/**
 * @fileoverview A global registry for entry points into a program,
 * so that they can be instrumented. Each module should register their
 * entry points with this registry. Designed to be compiled out
 * if no instrumentation is requested.
 *
 * Entry points may be registered before or after a call to
 * goog.debug.entryPointRegistry.monitorAll. If an entry point is registered
 * later, the existing monitor will instrument the new entry point.
 *
 * @author nicksantos@google.com (Nick Santos)
 */

goog.provide('goog.debug.EntryPointMonitor');
goog.provide('goog.debug.entryPointRegistry');

goog.require('goog.asserts');



/**
 * @interface
 */
goog.debug.EntryPointMonitor = function() {};


/**
 * Instruments a function.
 *
 * @param {!Function} fn A function to instrument.
 * @return {!Function} The instrumented function.
 */
goog.debug.EntryPointMonitor.prototype.wrap;


/**
 * Try to remove an instrumentation wrapper created by this monitor.
 * If the function passed to unwrap is not a wrapper created by this
 * monitor, then we will do nothing.
 *
 * Notice that some wrappers may not be unwrappable. For example, if other
 * monitors have applied their own wrappers, then it will be impossible to
 * unwrap them because their wrappers will have captured our wrapper.
 *
 * So it is important that entry points are unwrapped in the reverse
 * order that they were wrapped.
 *
 * @param {!Function} fn A function to unwrap.
 * @return {!Function} The unwrapped function, or {@code fn} if it was not
 *     a wrapped function created by this monitor.
 */
goog.debug.EntryPointMonitor.prototype.unwrap;


/**
 * An array of entry point callbacks.
 * @type {!Array<function(!Function)>}
 * @private
 */
goog.debug.entryPointRegistry.refList_ = [];


/**
 * Monitors that should wrap all the entry points.
 * @type {!Array<!goog.debug.EntryPointMonitor>}
 * @private
 */
goog.debug.entryPointRegistry.monitors_ = [];


/**
 * Whether goog.debug.entryPointRegistry.monitorAll has ever been called.
 * Checking this allows the compiler to optimize out the registrations.
 * @type {boolean}
 * @private
 */
goog.debug.entryPointRegistry.monitorsMayExist_ = false;


/**
 * Register an entry point with this module.
 *
 * The entry point will be instrumented when a monitor is passed to
 * goog.debug.entryPointRegistry.monitorAll. If this has already occurred, the
 * entry point is instrumented immediately.
 *
 * @param {function(!Function)} callback A callback function which is called
 *     with a transforming function to instrument the entry point. The callback
 *     is responsible for wrapping the relevant entry point with the
 *     transforming function.
 */
goog.debug.entryPointRegistry.register = function(callback) {
  // Don't use push(), so that this can be compiled out.
  goog.debug.entryPointRegistry
      .refList_[goog.debug.entryPointRegistry.refList_.length] = callback;
  // If no one calls monitorAll, this can be compiled out.
  if (goog.debug.entryPointRegistry.monitorsMayExist_) {
    var monitors = goog.debug.entryPointRegistry.monitors_;
    for (var i = 0; i < monitors.length; i++) {
      callback(goog.bind(monitors[i].wrap, monitors[i]));
    }
  }
};


/**
 * Configures a monitor to wrap all entry points.
 *
 * Entry points that have already been registered are immediately wrapped by
 * the monitor. When an entry point is registered in the future, it will also
 * be wrapped by the monitor when it is registered.
 *
 * @param {!goog.debug.EntryPointMonitor} monitor An entry point monitor.
 */
goog.debug.entryPointRegistry.monitorAll = function(monitor) {
  goog.debug.entryPointRegistry.monitorsMayExist_ = true;
  var transformer = goog.bind(monitor.wrap, monitor);
  for (var i = 0; i < goog.debug.entryPointRegistry.refList_.length; i++) {
    goog.debug.entryPointRegistry.refList_[i](transformer);
  }
  goog.debug.entryPointRegistry.monitors_.push(monitor);
};


/**
 * Try to unmonitor all the entry points that have already been registered. If
 * an entry point is registered in the future, it will not be wrapped by the
 * monitor when it is registered. Note that this may fail if the entry points
 * have additional wrapping.
 *
 * @param {!goog.debug.EntryPointMonitor} monitor The last monitor to wrap
 *     the entry points.
 * @throws {Error} If the monitor is not the most recently configured monitor.
 */
goog.debug.entryPointRegistry.unmonitorAllIfPossible = function(monitor) {
  var monitors = goog.debug.entryPointRegistry.monitors_;
  goog.asserts.assert(
      monitor == monitors[monitors.length - 1],
      'Only the most recent monitor can be unwrapped.');
  var transformer = goog.bind(monitor.unwrap, monitor);
  for (var i = 0; i < goog.debug.entryPointRegistry.refList_.length; i++) {
    goog.debug.entryPointRegistry.refList_[i](transformer);
  }
  monitors.length--;
};

// Copyright 2007 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/**
 * @fileoverview Defines the goog.dom.TagName enum.  This enumerates
 * all HTML tag names specified in either the the W3C HTML 4.01 index of
 * elements or the HTML5 draft specification.
 *
 * References:
 * http://www.w3.org/TR/html401/index/elements.html
 * http://dev.w3.org/html5/spec/section-index.html
 *
 */
goog.provide('goog.dom.TagName');


/**
 * Enum of all html tag names specified by the W3C HTML4.01 and HTML5
 * specifications.
 * @enum {string}
 */
goog.dom.TagName = {
  A: 'A',
  ABBR: 'ABBR',
  ACRONYM: 'ACRONYM',
  ADDRESS: 'ADDRESS',
  APPLET: 'APPLET',
  AREA: 'AREA',
  ARTICLE: 'ARTICLE',
  ASIDE: 'ASIDE',
  AUDIO: 'AUDIO',
  B: 'B',
  BASE: 'BASE',
  BASEFONT: 'BASEFONT',
  BDI: 'BDI',
  BDO: 'BDO',
  BIG: 'BIG',
  BLOCKQUOTE: 'BLOCKQUOTE',
  BODY: 'BODY',
  BR: 'BR',
  BUTTON: 'BUTTON',
  CANVAS: 'CANVAS',
  CAPTION: 'CAPTION',
  CENTER: 'CENTER',
  CITE: 'CITE',
  CODE: 'CODE',
  COL: 'COL',
  COLGROUP: 'COLGROUP',
  COMMAND: 'COMMAND',
  DATA: 'DATA',
  DATALIST: 'DATALIST',
  DD: 'DD',
  DEL: 'DEL',
  DETAILS: 'DETAILS',
  DFN: 'DFN',
  DIALOG: 'DIALOG',
  DIR: 'DIR',
  DIV: 'DIV',
  DL: 'DL',
  DT: 'DT',
  EM: 'EM',
  EMBED: 'EMBED',
  FIELDSET: 'FIELDSET',
  FIGCAPTION: 'FIGCAPTION',
  FIGURE: 'FIGURE',
  FONT: 'FONT',
  FOOTER: 'FOOTER',
  FORM: 'FORM',
  FRAME: 'FRAME',
  FRAMESET: 'FRAMESET',
  H1: 'H1',
  H2: 'H2',
  H3: 'H3',
  H4: 'H4',
  H5: 'H5',
  H6: 'H6',
  HEAD: 'HEAD',
  HEADER: 'HEADER',
  HGROUP: 'HGROUP',
  HR: 'HR',
  HTML: 'HTML',
  I: 'I',
  IFRAME: 'IFRAME',
  IMG: 'IMG',
  INPUT: 'INPUT',
  INS: 'INS',
  ISINDEX: 'ISINDEX',
  KBD: 'KBD',
  KEYGEN: 'KEYGEN',
  LABEL: 'LABEL',
  LEGEND: 'LEGEND',
  LI: 'LI',
  LINK: 'LINK',
  MAP: 'MAP',
  MARK: 'MARK',
  MATH: 'MATH',
  MENU: 'MENU',
  META: 'META',
  METER: 'METER',
  NAV: 'NAV',
  NOFRAMES: 'NOFRAMES',
  NOSCRIPT: 'NOSCRIPT',
  OBJECT: 'OBJECT',
  OL: 'OL',
  OPTGROUP: 'OPTGROUP',
  OPTION: 'OPTION',
  OUTPUT: 'OUTPUT',
  P: 'P',
  PARAM: 'PARAM',
  PRE: 'PRE',
  PROGRESS: 'PROGRESS',
  Q: 'Q',
  RP: 'RP',
  RT: 'RT',
  RUBY: 'RUBY',
  S: 'S',
  SAMP: 'SAMP',
  SCRIPT: 'SCRIPT',
  SECTION: 'SECTION',
  SELECT: 'SELECT',
  SMALL: 'SMALL',
  SOURCE: 'SOURCE',
  SPAN: 'SPAN',
  STRIKE: 'STRIKE',
  STRONG: 'STRONG',
  STYLE: 'STYLE',
  SUB: 'SUB',
  SUMMARY: 'SUMMARY',
  SUP: 'SUP',
  SVG: 'SVG',
  TABLE: 'TABLE',
  TBODY: 'TBODY',
  TD: 'TD',
  TEMPLATE: 'TEMPLATE',
  TEXTAREA: 'TEXTAREA',
  TFOOT: 'TFOOT',
  TH: 'TH',
  THEAD: 'THEAD',
  TIME: 'TIME',
  TITLE: 'TITLE',
  TR: 'TR',
  TRACK: 'TRACK',
  TT: 'TT',
  U: 'U',
  UL: 'UL',
  VAR: 'VAR',
  VIDEO: 'VIDEO',
  WBR: 'WBR'
};

// Copyright 2008 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/**
 * @fileoverview Utilities for creating functions. Loosely inspired by the
 * java classes: http://goo.gl/GM0Hmu and http://goo.gl/6k7nI8.
 *
 * @author nicksantos@google.com (Nick Santos)
 */


goog.provide('goog.functions');


/**
 * Creates a function that always returns the same value.
 * @param {T} retValue The value to return.
 * @return {function():T} The new function.
 * @template T
 */
goog.functions.constant = function(retValue) {
  return function() { return retValue; };
};


/**
 * Always returns false.
 * @type {function(...): boolean}
 */
goog.functions.FALSE = goog.functions.constant(false);


/**
 * Always returns true.
 * @type {function(...): boolean}
 */
goog.functions.TRUE = goog.functions.constant(true);


/**
 * Always returns NULL.
 * @type {function(...): null}
 */
goog.functions.NULL = goog.functions.constant(null);


/**
 * A simple function that returns the first argument of whatever is passed
 * into it.
 * @param {T=} opt_returnValue The single value that will be returned.
 * @param {...*} var_args Optional trailing arguments. These are ignored.
 * @return {T} The first argument passed in, or undefined if nothing was passed.
 * @template T
 */
goog.functions.identity = function(opt_returnValue, var_args) {
  return opt_returnValue;
};


/**
 * Creates a function that always throws an error with the given message.
 * @param {string} message The error message.
 * @return {!Function} The error-throwing function.
 */
goog.functions.error = function(message) {
  return function() { throw Error(message); };
};


/**
 * Creates a function that throws the given object.
 * @param {*} err An object to be thrown.
 * @return {!Function} The error-throwing function.
 */
goog.functions.fail = function(err) {
  return function() { throw err; };
};


/**
 * Given a function, create a function that keeps opt_numArgs arguments and
 * silently discards all additional arguments.
 * @param {Function} f The original function.
 * @param {number=} opt_numArgs The number of arguments to keep. Defaults to 0.
 * @return {!Function} A version of f that only keeps the first opt_numArgs
 *     arguments.
 */
goog.functions.lock = function(f, opt_numArgs) {
  opt_numArgs = opt_numArgs || 0;
  return function() {
    return f.apply(this, Array.prototype.slice.call(arguments, 0, opt_numArgs));
  };
};


/**
 * Creates a function that returns its nth argument.
 * @param {number} n The position of the return argument.
 * @return {!Function} A new function.
 */
goog.functions.nth = function(n) {
  return function() { return arguments[n]; };
};


/**
 * Like goog.partial(), except that arguments are added after arguments to the
 * returned function.
 *
 * Usage:
 * function f(arg1, arg2, arg3, arg4) { ... }
 * var g = goog.functions.partialRight(f, arg3, arg4);
 * g(arg1, arg2);
 *
 * @param {!Function} fn A function to partially apply.
 * @param {...*} var_args Additional arguments that are partially applied to fn
 *     at the end.
 * @return {!Function} A partially-applied form of the function goog.partial()
 *     was invoked as a method of.
 */
goog.functions.partialRight = function(fn, var_args) {
  var rightArgs = Array.prototype.slice.call(arguments, 1);
  return function() {
    var newArgs = Array.prototype.slice.call(arguments);
    newArgs.push.apply(newArgs, rightArgs);
    return fn.apply(this, newArgs);
  };
};


/**
 * Given a function, create a new function that swallows its return value
 * and replaces it with a new one.
 * @param {Function} f A function.
 * @param {T} retValue A new return value.
 * @return {function(...?):T} A new function.
 * @template T
 */
goog.functions.withReturnValue = function(f, retValue) {
  return goog.functions.sequence(f, goog.functions.constant(retValue));
};


/**
 * Creates a function that returns whether its argument equals the given value.
 *
 * Example:
 * var key = goog.object.findKey(obj, goog.functions.equalTo('needle'));
 *
 * @param {*} value The value to compare to.
 * @param {boolean=} opt_useLooseComparison Whether to use a loose (==)
 *     comparison rather than a strict (===) one. Defaults to false.
 * @return {function(*):boolean} The new function.
 */
goog.functions.equalTo = function(value, opt_useLooseComparison) {
  return function(other) {
    return opt_useLooseComparison ? (value == other) : (value === other);
  };
};


/**
 * Creates the composition of the functions passed in.
 * For example, (goog.functions.compose(f, g))(a) is equivalent to f(g(a)).
 * @param {function(...?):T} fn The final function.
 * @param {...Function} var_args A list of functions.
 * @return {function(...?):T} The composition of all inputs.
 * @template T
 */
goog.functions.compose = function(fn, var_args) {
  var functions = arguments;
  var length = functions.length;
  return function() {
    var result;
    if (length) {
      result = functions[length - 1].apply(this, arguments);
    }

    for (var i = length - 2; i >= 0; i--) {
      result = functions[i].call(this, result);
    }
    return result;
  };
};


/**
 * Creates a function that calls the functions passed in in sequence, and
 * returns the value of the last function. For example,
 * (goog.functions.sequence(f, g))(x) is equivalent to f(x),g(x).
 * @param {...Function} var_args A list of functions.
 * @return {!Function} A function that calls all inputs in sequence.
 */
goog.functions.sequence = function(var_args) {
  var functions = arguments;
  var length = functions.length;
  return function() {
    var result;
    for (var i = 0; i < length; i++) {
      result = functions[i].apply(this, arguments);
    }
    return result;
  };
};


/**
 * Creates a function that returns true if each of its components evaluates
 * to true. The components are evaluated in order, and the evaluation will be
 * short-circuited as soon as a function returns false.
 * For example, (goog.functions.and(f, g))(x) is equivalent to f(x) && g(x).
 * @param {...Function} var_args A list of functions.
 * @return {function(...?):boolean} A function that ANDs its component
 *      functions.
 */
goog.functions.and = function(var_args) {
  var functions = arguments;
  var length = functions.length;
  return function() {
    for (var i = 0; i < length; i++) {
      if (!functions[i].apply(this, arguments)) {
        return false;
      }
    }
    return true;
  };
};


/**
 * Creates a function that returns true if any of its components evaluates
 * to true. The components are evaluated in order, and the evaluation will be
 * short-circuited as soon as a function returns true.
 * For example, (goog.functions.or(f, g))(x) is equivalent to f(x) || g(x).
 * @param {...Function} var_args A list of functions.
 * @return {function(...?):boolean} A function that ORs its component
 *    functions.
 */
goog.functions.or = function(var_args) {
  var functions = arguments;
  var length = functions.length;
  return function() {
    for (var i = 0; i < length; i++) {
      if (functions[i].apply(this, arguments)) {
        return true;
      }
    }
    return false;
  };
};


/**
 * Creates a function that returns the Boolean opposite of a provided function.
 * For example, (goog.functions.not(f))(x) is equivalent to !f(x).
 * @param {!Function} f The original function.
 * @return {function(...?):boolean} A function that delegates to f and returns
 * opposite.
 */
goog.functions.not = function(f) {
  return function() { return !f.apply(this, arguments); };
};


/**
 * Generic factory function to construct an object given the constructor
 * and the arguments. Intended to be bound to create object factories.
 *
 * Example:
 *
 * var factory = goog.partial(goog.functions.create, Class);
 *
 * @param {function(new:T, ...)} constructor The constructor for the Object.
 * @param {...*} var_args The arguments to be passed to the constructor.
 * @return {T} A new instance of the class given in {@code constructor}.
 * @template T
 */
goog.functions.create = function(constructor, var_args) {
  /**
   * @constructor
   * @final
   */
  var temp = function() {};
  temp.prototype = constructor.prototype;

  // obj will have constructor's prototype in its chain and
  // 'obj instanceof constructor' will be true.
  var obj = new temp();

  // obj is initialized by constructor.
  // arguments is only array-like so lacks shift(), but can be used with
  // the Array prototype function.
  constructor.apply(obj, Array.prototype.slice.call(arguments, 1));
  return obj;
};


/**
 * @define {boolean} Whether the return value cache should be used.
 *    This should only be used to disable caches when testing.
 */
goog.define('goog.functions.CACHE_RETURN_VALUE', true);


/**
 * Gives a wrapper function that caches the return value of a parameterless
 * function when first called.
 *
 * When called for the first time, the given function is called and its
 * return value is cached (thus this is only appropriate for idempotent
 * functions).  Subsequent calls will return the cached return value. This
 * allows the evaluation of expensive functions to be delayed until first used.
 *
 * To cache the return values of functions with parameters, see goog.memoize.
 *
 * @param {!function():T} fn A function to lazily evaluate.
 * @return {!function():T} A wrapped version the function.
 * @template T
 */
goog.functions.cacheReturnValue = function(fn) {
  var called = false;
  var value;

  return function() {
    if (!goog.functions.CACHE_RETURN_VALUE) {
      return fn();
    }

    if (!called) {
      value = fn();
      called = true;
    }

    return value;
  };
};


/**
 * Wraps a function to allow it to be called, at most, once. All
 * additional calls are no-ops.
 *
 * This is particularly useful for initialization functions
 * that should be called, at most, once.
 *
 * @param {function():*} f Function to call.
 * @return {function():undefined} Wrapped function.
 */
goog.functions.once = function(f) {
  // Keep a reference to the function that we null out when we're done with
  // it -- that way, the function can be GC'd when we're done with it.
  var inner = f;
  return function() {
    if (inner) {
      var tmp = inner;
      inner = null;
      tmp();
    }
  };
};


/**
 * Wraps a function to allow it to be called, at most, once for each sequence of
 * calls fired repeatedly so long as they are fired less than a specified
 * interval apart (in milliseconds). Whether it receives one signal or multiple,
 * it will always wait until a full interval has elapsed since the last signal
 * before performing the action, passing the arguments from the last call of the
 * debouncing decorator into the decorated function.
 *
 * This is particularly useful for bulking up repeated user actions (e.g. only
 * refreshing a view once a user finishes typing rather than updating with every
 * keystroke). For more stateful debouncing with support for pausing, resuming,
 * and canceling debounced actions, use {@code goog.async.Debouncer}.
 *
 * @param {function(this:SCOPE, ...?)} f Function to call.
 * @param {number} interval Interval over which to debounce. The function will
 *     only be called after the full interval has elapsed since the last call.
 * @param {SCOPE=} opt_scope Object in whose scope to call the function.
 * @return {function(...?): undefined} Wrapped function.
 * @template SCOPE
 */
goog.functions.debounce = function(f, interval, opt_scope) {
  if (opt_scope) {
    f = goog.bind(f, opt_scope);
  }
  var timeout = null;
  return /** @type {function(...?)} */ (function(var_args) {
    goog.global.clearTimeout(timeout);
    var args = arguments;
    timeout =
        goog.global.setTimeout(function() { f.apply(null, args); }, interval);
  });
};


/**
 * Wraps a function to allow it to be called, at most, once per interval
 * (specified in milliseconds). If it is called multiple times while it is
 * waiting, it will only perform the action once at the end of the interval,
 * passing the arguments from the last call of the throttling decorator into the
 * decorated function.
 *
 * This is particularly useful for limiting repeated user requests (e.g.
 * preventing a user from spamming a server with frequent view refreshes). For
 * more stateful throttling with support for pausing, resuming, and canceling
 * throttled actions, use {@code goog.async.Throttle}.
 *
 * @param {function(this:SCOPE, ...?)} f Function to call.
 * @param {number} interval Interval over which to throttle. The function can
 *     only be called once per interval.
 * @param {SCOPE=} opt_scope Object in whose scope to call the function.
 * @return {function(...?): undefined} Wrapped function.
 * @template SCOPE
 */
goog.functions.throttle = function(f, interval, opt_scope) {
  if (opt_scope) {
    f = goog.bind(f, opt_scope);
  }
  var timeout = null;
  var shouldFire = false;
  var args = [];

  var handleTimeout = function() {
    timeout = null;
    if (shouldFire) {
      shouldFire = false;
      fire();
    }
  };

  var fire = function() {
    timeout = goog.global.setTimeout(handleTimeout, interval);
    f.apply(null, args);
  };

  return /** @type {function(...?)} */ (function(var_args) {
    args = arguments;
    if (!timeout) {
      fire();
    } else {
      shouldFire = true;
    }
  });
};

// Copyright 2013 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/**
 * @fileoverview Provides a function to schedule running a function as soon
 * as possible after the current JS execution stops and yields to the event
 * loop.
 *
 */

goog.provide('goog.async.nextTick');
goog.provide('goog.async.throwException');

goog.require('goog.debug.entryPointRegistry');
goog.require('goog.dom.TagName');
goog.require('goog.functions');
goog.require('goog.labs.userAgent.browser');
goog.require('goog.labs.userAgent.engine');


/**
 * Throw an item without interrupting the current execution context.  For
 * example, if processing a group of items in a loop, sometimes it is useful
 * to report an error while still allowing the rest of the batch to be
 * processed.
 * @param {*} exception
 */
goog.async.throwException = function(exception) {
  // Each throw needs to be in its own context.
  goog.global.setTimeout(function() { throw exception; }, 0);
};


/**
 * Fires the provided callbacks as soon as possible after the current JS
 * execution context. setTimeout(…, 0) takes at least 4ms when called from
 * within another setTimeout(…, 0) for legacy reasons.
 *
 * This will not schedule the callback as a microtask (i.e. a task that can
 * preempt user input or networking callbacks). It is meant to emulate what
 * setTimeout(_, 0) would do if it were not throttled. If you desire microtask
 * behavior, use {@see goog.Promise} instead.
 *
 * @param {function(this:SCOPE)} callback Callback function to fire as soon as
 *     possible.
 * @param {SCOPE=} opt_context Object in whose scope to call the listener.
 * @param {boolean=} opt_useSetImmediate Avoid the IE workaround that
 *     ensures correctness at the cost of speed. See comments for details.
 * @template SCOPE
 */
goog.async.nextTick = function(callback, opt_context, opt_useSetImmediate) {
  var cb = callback;
  if (opt_context) {
    cb = goog.bind(callback, opt_context);
  }
  cb = goog.async.nextTick.wrapCallback_(cb);
  // Note we do allow callers to also request setImmediate if they are willing
  // to accept the possible tradeoffs of incorrectness in exchange for speed.
  // The IE fallback of readystate change is much slower. See useSetImmediate_
  // for details.
  if (goog.isFunction(goog.global.setImmediate) &&
      (opt_useSetImmediate || goog.async.nextTick.useSetImmediate_())) {
    goog.global.setImmediate(cb);
    return;
  }

  // Look for and cache the custom fallback version of setImmediate.
  if (!goog.async.nextTick.setImmediate_) {
    goog.async.nextTick.setImmediate_ =
        goog.async.nextTick.getSetImmediateEmulator_();
  }
  goog.async.nextTick.setImmediate_(cb);
};


/**
 * Returns whether should use setImmediate implementation currently on window.
 *
 * window.setImmediate was introduced and currently only supported by IE10+,
 * but due to a bug in the implementation it is not guaranteed that
 * setImmediate is faster than setTimeout nor that setImmediate N is before
 * setImmediate N+1. That is why we do not use the native version if
 * available. We do, however, call setImmediate if it is a non-native function
 * because that indicates that it has been replaced by goog.testing.MockClock
 * which we do want to support.
 * See
 * http://connect.microsoft.com/IE/feedback/details/801823/setimmediate-and-messagechannel-are-broken-in-ie10
 *
 * @return {boolean} Whether to use the implementation of setImmediate defined
 *     on Window.
 * @private
 */
goog.async.nextTick.useSetImmediate_ = function() {
  // Not a browser environment.
  if (!goog.global.Window || !goog.global.Window.prototype) {
    return true;
  }

  // MS Edge has window.setImmediate natively, but it's not on Window.prototype.
  // Also, there's no clean way to detect if the goog.global.setImmediate has
  // been replaced by mockClock as its replacement also shows up as "[native
  // code]" when using toString. Therefore, just always use
  // goog.global.setImmediate for Edge. It's unclear if it suffers the same
  // issues as IE10/11, but based on
  // https://dev.modern.ie/testdrive/demos/setimmediatesorting/
  // it seems they've been working to ensure it's WAI.
  if (goog.labs.userAgent.browser.isEdge() ||
      goog.global.Window.prototype.setImmediate != goog.global.setImmediate) {
    // Something redefined setImmediate in which case we decide to use it (This
    // is so that we use the mockClock setImmediate).
    return true;
  }

  return false;
};


/**
 * Cache for the setImmediate implementation.
 * @type {function(function())}
 * @private
 */
goog.async.nextTick.setImmediate_;


/**
 * Determines the best possible implementation to run a function as soon as
 * the JS event loop is idle.
 * @return {function(function())} The "setImmediate" implementation.
 * @private
 */
goog.async.nextTick.getSetImmediateEmulator_ = function() {
  // Create a private message channel and use it to postMessage empty messages
  // to ourselves.
  var Channel = goog.global['MessageChannel'];
  // If MessageChannel is not available and we are in a browser, implement
  // an iframe based polyfill in browsers that have postMessage and
  // document.addEventListener. The latter excludes IE8 because it has a
  // synchronous postMessage implementation.
  if (typeof Channel === 'undefined' && typeof window !== 'undefined' &&
      window.postMessage && window.addEventListener &&
      // Presto (The old pre-blink Opera engine) has problems with iframes
      // and contentWindow.
      !goog.labs.userAgent.engine.isPresto()) {
    /** @constructor */
    Channel = function() {
      // Make an empty, invisible iframe.
      var iframe = /** @type {!HTMLIFrameElement} */ (
          document.createElement(goog.dom.TagName.IFRAME));
      iframe.style.display = 'none';
      iframe.src = '';
      document.documentElement.appendChild(iframe);
      var win = iframe.contentWindow;
      var doc = win.document;
      doc.open();
      doc.write('');
      doc.close();
      // Do not post anything sensitive over this channel, as the workaround for
      // pages with file: origin could allow that information to be modified or
      // intercepted.
      var message = 'callImmediate' + Math.random();
      // The same origin policy rejects attempts to postMessage from file: urls
      // unless the origin is '*'.
      // TODO(b/16335441): Use '*' origin for data: and other similar protocols.
      var origin = win.location.protocol == 'file:' ?
          '*' :
          win.location.protocol + '//' + win.location.host;
      var onmessage = goog.bind(function(e) {
        // Validate origin and message to make sure that this message was
        // intended for us. If the origin is set to '*' (see above) only the
        // message needs to match since, for example, '*' != 'file://'. Allowing
        // the wildcard is ok, as we are not concerned with security here.
        if ((origin != '*' && e.origin != origin) || e.data != message) {
          return;
        }
        this['port1'].onmessage();
      }, this);
      win.addEventListener('message', onmessage, false);
      this['port1'] = {};
      this['port2'] = {
        postMessage: function() { win.postMessage(message, origin); }
      };
    };
  }
  if (typeof Channel !== 'undefined' && (!goog.labs.userAgent.browser.isIE())) {
    // Exclude all of IE due to
    // http://codeforhire.com/2013/09/21/setimmediate-and-messagechannel-broken-on-internet-explorer-10/
    // which allows starving postMessage with a busy setTimeout loop.
    // This currently affects IE10 and IE11 which would otherwise be able
    // to use the postMessage based fallbacks.
    var channel = new Channel();
    // Use a fifo linked list to call callbacks in the right order.
    var head = {};
    var tail = head;
    channel['port1'].onmessage = function() {
      if (goog.isDef(head.next)) {
        head = head.next;
        var cb = head.cb;
        head.cb = null;
        cb();
      }
    };
    return function(cb) {
      tail.next = {cb: cb};
      tail = tail.next;
      channel['port2'].postMessage(0);
    };
  }
  // Implementation for IE6 to IE10: Script elements fire an asynchronous
  // onreadystatechange event when inserted into the DOM.
  if (typeof document !== 'undefined' &&
      'onreadystatechange' in document.createElement(goog.dom.TagName.SCRIPT)) {
    return function(cb) {
      var script = document.createElement(goog.dom.TagName.SCRIPT);
      script.onreadystatechange = function() {
        // Clean up and call the callback.
        script.onreadystatechange = null;
        script.parentNode.removeChild(script);
        script = null;
        cb();
        cb = null;
      };
      document.documentElement.appendChild(script);
    };
  }
  // Fall back to setTimeout with 0. In browsers this creates a delay of 5ms
  // or more.
  // NOTE(user): This fallback is used for IE11.
  return function(cb) { goog.global.setTimeout(cb, 0); };
};


/**
 * Helper function that is overrided to protect callbacks with entry point
 * monitor if the application monitors entry points.
 * @param {function()} callback Callback function to fire as soon as possible.
 * @return {function()} The wrapped callback.
 * @private
 */
goog.async.nextTick.wrapCallback_ = goog.functions.identity;


// Register the callback function as an entry point, so that it can be
// monitored for exception handling, etc. This has to be done in this file
// since it requires special code to handle all browsers.
goog.debug.entryPointRegistry.register(
    /**
     * @param {function(!Function): !Function} transformer The transforming
     *     function.
     */
    function(transformer) { goog.async.nextTick.wrapCallback_ = transformer; });

goog.provide('ol.webgl');


/** Constants taken from goog.webgl
 */


/**
 * @const
 * @type {number}
 */
ol.webgl.ONE = 1;


/**
 * @const
 * @type {number}
 */
ol.webgl.SRC_ALPHA = 0x0302;


/**
 * @const
 * @type {number}
 */
ol.webgl.COLOR_ATTACHMENT0 = 0x8CE0;


/**
 * @const
 * @type {number}
 */
ol.webgl.COLOR_BUFFER_BIT = 0x00004000;


/**
 * @const
 * @type {number}
 */
ol.webgl.TRIANGLES = 0x0004;


/**
 * @const
 * @type {number}
 */
ol.webgl.TRIANGLE_STRIP = 0x0005;


/**
 * @const
 * @type {number}
 */
ol.webgl.ONE_MINUS_SRC_ALPHA = 0x0303;


/**
 * @const
 * @type {number}
 */
ol.webgl.ARRAY_BUFFER = 0x8892;


/**
 * @const
 * @type {number}
 */
ol.webgl.ELEMENT_ARRAY_BUFFER = 0x8893;


/**
 * @const
 * @type {number}
 */
ol.webgl.STREAM_DRAW = 0x88E0;


/**
 * @const
 * @type {number}
 */
ol.webgl.STATIC_DRAW = 0x88E4;


/**
 * @const
 * @type {number}
 */
ol.webgl.DYNAMIC_DRAW = 0x88E8;


/**
 * @const
 * @type {number}
 */
ol.webgl.CULL_FACE = 0x0B44;


/**
 * @const
 * @type {number}
 */
ol.webgl.BLEND = 0x0BE2;


/**
 * @const
 * @type {number}
 */
ol.webgl.STENCIL_TEST = 0x0B90;


/**
 * @const
 * @type {number}
 */
ol.webgl.DEPTH_TEST = 0x0B71;


/**
 * @const
 * @type {number}
 */
ol.webgl.SCISSOR_TEST = 0x0C11;


/**
 * @const
 * @type {number}
 */
ol.webgl.UNSIGNED_BYTE = 0x1401;


/**
 * @const
 * @type {number}
 */
ol.webgl.UNSIGNED_SHORT = 0x1403;


/**
 * @const
 * @type {number}
 */
ol.webgl.UNSIGNED_INT = 0x1405;


/**
 * @const
 * @type {number}
 */
ol.webgl.FLOAT = 0x1406;


/**
 * @const
 * @type {number}
 */
ol.webgl.RGBA = 0x1908;


/**
 * @const
 * @type {number}
 */
ol.webgl.FRAGMENT_SHADER = 0x8B30;


/**
 * @const
 * @type {number}
 */
ol.webgl.VERTEX_SHADER = 0x8B31;


/**
 * @const
 * @type {number}
 */
ol.webgl.LINK_STATUS = 0x8B82;


/**
 * @const
 * @type {number}
 */
ol.webgl.LINEAR = 0x2601;


/**
 * @const
 * @type {number}
 */
ol.webgl.TEXTURE_MAG_FILTER = 0x2800;


/**
 * @const
 * @type {number}
 */
ol.webgl.TEXTURE_MIN_FILTER = 0x2801;


/**
 * @const
 * @type {number}
 */
ol.webgl.TEXTURE_WRAP_S = 0x2802;


/**
 * @const
 * @type {number}
 */
ol.webgl.TEXTURE_WRAP_T = 0x2803;


/**
 * @const
 * @type {number}
 */
ol.webgl.TEXTURE_2D = 0x0DE1;


/**
 * @const
 * @type {number}
 */
ol.webgl.TEXTURE0 = 0x84C0;


/**
 * @const
 * @type {number}
 */
ol.webgl.CLAMP_TO_EDGE = 0x812F;


/**
 * @const
 * @type {number}
 */
ol.webgl.COMPILE_STATUS = 0x8B81;


/**
 * @const
 * @type {number}
 */
ol.webgl.FRAMEBUFFER = 0x8D40;


/** end of goog.webgl constants
 */


/**
 * @const
 * @private
 * @type {Array.<string>}
 */
ol.webgl.CONTEXT_IDS_ = [
  'experimental-webgl',
  'webgl',
  'webkit-3d',
  'moz-webgl'
];


/**
 * @param {HTMLCanvasElement} canvas Canvas.
 * @param {Object=} opt_attributes Attributes.
 * @return {WebGLRenderingContext} WebGL rendering context.
 */
ol.webgl.getContext = function(canvas, opt_attributes) {
  var context, i, ii = ol.webgl.CONTEXT_IDS_.length;
  for (i = 0; i < ii; ++i) {
    try {
      context = canvas.getContext(ol.webgl.CONTEXT_IDS_[i], opt_attributes);
      if (context) {
        return /** @type {!WebGLRenderingContext} */ (context);
      }
    } catch (e) {
      // pass
    }
  }
  return null;
};

goog.provide('ol.has');

goog.require('ol');
goog.require('ol.dom');
goog.require('ol.webgl');


var ua = typeof navigator !== 'undefined' ?
    navigator.userAgent.toLowerCase() : '';

/**
 * User agent string says we are dealing with Firefox as browser.
 * @type {boolean}
 */
ol.has.FIREFOX = ua.indexOf('firefox') !== -1;

/**
 * User agent string says we are dealing with Safari as browser.
 * @type {boolean}
 */
ol.has.SAFARI = ua.indexOf('safari') !== -1 && ua.indexOf('chrom') === -1;

/**
 * User agent string says we are dealing with a Mac as platform.
 * @type {boolean}
 */
ol.has.MAC = ua.indexOf('macintosh') !== -1;


/**
 * The ratio between physical pixels and device-independent pixels
 * (dips) on the device (`window.devicePixelRatio`).
 * @const
 * @type {number}
 * @api stable
 */
ol.has.DEVICE_PIXEL_RATIO = ol.global.devicePixelRatio || 1;


/**
 * True if the browser's Canvas implementation implements {get,set}LineDash.
 * @type {boolean}
 */
ol.has.CANVAS_LINE_DASH = false;


/**
 * True if both the library and browser support Canvas.  Always `false`
 * if `ol.ENABLE_CANVAS` is set to `false` at compile time.
 * @const
 * @type {boolean}
 * @api stable
 */
ol.has.CANVAS = ol.ENABLE_CANVAS && (
    /**
     * @return {boolean} Canvas supported.
     */
    function() {
      if (!('HTMLCanvasElement' in ol.global)) {
        return false;
      }
      try {
        var context = ol.dom.createCanvasContext2D();
        if (!context) {
          return false;
        } else {
          if (context.setLineDash !== undefined) {
            ol.has.CANVAS_LINE_DASH = true;
          }
          return true;
        }
      } catch (e) {
        return false;
      }
    })();


/**
 * Indicates if DeviceOrientation is supported in the user's browser.
 * @const
 * @type {boolean}
 * @api stable
 */
ol.has.DEVICE_ORIENTATION = 'DeviceOrientationEvent' in ol.global;


/**
 * True if `ol.ENABLE_DOM` is set to `true` at compile time.
 * @const
 * @type {boolean}
 */
ol.has.DOM = ol.ENABLE_DOM;


/**
 * Is HTML5 geolocation supported in the current browser?
 * @const
 * @type {boolean}
 * @api stable
 */
ol.has.GEOLOCATION = 'geolocation' in ol.global.navigator;


/**
 * True if browser supports touch events.
 * @const
 * @type {boolean}
 * @api stable
 */
ol.has.TOUCH = ol.ASSUME_TOUCH || 'ontouchstart' in ol.global;


/**
 * True if browser supports pointer events.
 * @const
 * @type {boolean}
 */
ol.has.POINTER = 'PointerEvent' in ol.global;


/**
 * True if browser supports ms pointer events (IE 10).
 * @const
 * @type {boolean}
 */
ol.has.MSPOINTER = !!(ol.global.navigator.msPointerEnabled);


/**
 * True if both OpenLayers and browser support WebGL.  Always `false`
 * if `ol.ENABLE_WEBGL` is set to `false` at compile time.
 * @const
 * @type {boolean}
 * @api stable
 */
ol.has.WEBGL;


(function() {
  if (ol.ENABLE_WEBGL) {
    var hasWebGL = false;
    var textureSize;
    var /** @type {Array.<string>} */ extensions = [];

    if ('WebGLRenderingContext' in ol.global) {
      try {
        var canvas = /** @type {HTMLCanvasElement} */
            (document.createElement('CANVAS'));
        var gl = ol.webgl.getContext(canvas, {
          failIfMajorPerformanceCaveat: true
        });
        if (gl) {
          hasWebGL = true;
          textureSize = /** @type {number} */
              (gl.getParameter(gl.MAX_TEXTURE_SIZE));
          extensions = gl.getSupportedExtensions();
        }
      } catch (e) {
        // pass
      }
    }
    ol.has.WEBGL = hasWebGL;
    ol.WEBGL_EXTENSIONS = extensions;
    ol.WEBGL_MAX_TEXTURE_SIZE = textureSize;
  }
})();

goog.provide('ol.pointer.EventSource');


/**
 * @param {ol.pointer.PointerEventHandler} dispatcher Event handler.
 * @param {!Object.<string, function(Event)>} mapping Event
 *     mapping.
 * @constructor
 */
ol.pointer.EventSource = function(dispatcher, mapping) {
  /**
   * @type {ol.pointer.PointerEventHandler}
   */
  this.dispatcher = dispatcher;

  /**
   * @private
   * @const
   * @type {!Object.<string, function(Event)>}
   */
  this.mapping_ = mapping;
};


/**
 * List of events supported by this source.
 * @return {Array.<string>} Event names
 */
ol.pointer.EventSource.prototype.getEvents = function() {
  return Object.keys(this.mapping_);
};


/**
 * Returns a mapping between the supported event types and
 * the handlers that should handle an event.
 * @return {Object.<string, function(Event)>}
 *         Event/Handler mapping
 */
ol.pointer.EventSource.prototype.getMapping = function() {
  return this.mapping_;
};


/**
 * Returns the handler that should handle a given event type.
 * @param {string} eventType The event type.
 * @return {function(Event)} Handler
 */
ol.pointer.EventSource.prototype.getHandlerForEvent = function(eventType) {
  return this.mapping_[eventType];
};

// Based on https://github.com/Polymer/PointerEvents

// Copyright (c) 2013 The Polymer Authors. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

goog.provide('ol.pointer.MouseSource');

goog.require('ol');
goog.require('ol.pointer.EventSource');


/**
 * @param {ol.pointer.PointerEventHandler} dispatcher Event handler.
 * @constructor
 * @extends {ol.pointer.EventSource}
 */
ol.pointer.MouseSource = function(dispatcher) {
  var mapping = {
    'mousedown': this.mousedown,
    'mousemove': this.mousemove,
    'mouseup': this.mouseup,
    'mouseover': this.mouseover,
    'mouseout': this.mouseout
  };
  ol.pointer.EventSource.call(this, dispatcher, mapping);

  /**
   * @const
   * @type {!Object.<string, Event|Object>}
   */
  this.pointerMap = dispatcher.pointerMap;

  /**
   * @const
   * @type {Array.<ol.Pixel>}
   */
  this.lastTouches = [];
};
ol.inherits(ol.pointer.MouseSource, ol.pointer.EventSource);


/**
 * @const
 * @type {number}
 */
ol.pointer.MouseSource.POINTER_ID = 1;


/**
 * @const
 * @type {string}
 */
ol.pointer.MouseSource.POINTER_TYPE = 'mouse';


/**
 * Radius around touchend that swallows mouse events.
 *
 * @const
 * @type {number}
 */
ol.pointer.MouseSource.DEDUP_DIST = 25;


/**
 * Detect if a mouse event was simulated from a touch by
 * checking if previously there was a touch event at the
 * same position.
 *
 * FIXME - Known problem with the native Android browser on
 * Samsung GT-I9100 (Android 4.1.2):
 * In case the page is scrolled, this function does not work
 * correctly when a canvas is used (WebGL or canvas renderer).
 * Mouse listeners on canvas elements (for this browser), create
 * two mouse events: One 'good' and one 'bad' one (on other browsers or
 * when a div is used, there is only one event). For the 'bad' one,
 * clientX/clientY and also pageX/pageY are wrong when the page
 * is scrolled. Because of that, this function can not detect if
 * the events were simulated from a touch event. As result, a
 * pointer event at a wrong position is dispatched, which confuses
 * the map interactions.
 * It is unclear, how one can get the correct position for the event
 * or detect that the positions are invalid.
 *
 * @private
 * @param {Event} inEvent The in event.
 * @return {boolean} True, if the event was generated by a touch.
 */
ol.pointer.MouseSource.prototype.isEventSimulatedFromTouch_ = function(inEvent) {
  var lts = this.lastTouches;
  var x = inEvent.clientX, y = inEvent.clientY;
  for (var i = 0, l = lts.length, t; i < l && (t = lts[i]); i++) {
    // simulated mouse events will be swallowed near a primary touchend
    var dx = Math.abs(x - t[0]), dy = Math.abs(y - t[1]);
    if (dx <= ol.pointer.MouseSource.DEDUP_DIST &&
        dy <= ol.pointer.MouseSource.DEDUP_DIST) {
      return true;
    }
  }
  return false;
};


/**
 * Creates a copy of the original event that will be used
 * for the fake pointer event.
 *
 * @param {Event} inEvent The in event.
 * @param {ol.pointer.PointerEventHandler} dispatcher Event handler.
 * @return {Object} The copied event.
 */
ol.pointer.MouseSource.prepareEvent = function(inEvent, dispatcher) {
  var e = dispatcher.cloneEvent(inEvent, inEvent);

  // forward mouse preventDefault
  var pd = e.preventDefault;
  e.preventDefault = function() {
    inEvent.preventDefault();
    pd();
  };

  e.pointerId = ol.pointer.MouseSource.POINTER_ID;
  e.isPrimary = true;
  e.pointerType = ol.pointer.MouseSource.POINTER_TYPE;

  return e;
};


/**
 * Handler for `mousedown`.
 *
 * @param {Event} inEvent The in event.
 */
ol.pointer.MouseSource.prototype.mousedown = function(inEvent) {
  if (!this.isEventSimulatedFromTouch_(inEvent)) {
    // TODO(dfreedman) workaround for some elements not sending mouseup
    // http://crbug/149091
    if (ol.pointer.MouseSource.POINTER_ID.toString() in this.pointerMap) {
      this.cancel(inEvent);
    }
    var e = ol.pointer.MouseSource.prepareEvent(inEvent, this.dispatcher);
    this.pointerMap[ol.pointer.MouseSource.POINTER_ID.toString()] = inEvent;
    this.dispatcher.down(e, inEvent);
  }
};


/**
 * Handler for `mousemove`.
 *
 * @param {Event} inEvent The in event.
 */
ol.pointer.MouseSource.prototype.mousemove = function(inEvent) {
  if (!this.isEventSimulatedFromTouch_(inEvent)) {
    var e = ol.pointer.MouseSource.prepareEvent(inEvent, this.dispatcher);
    this.dispatcher.move(e, inEvent);
  }
};


/**
 * Handler for `mouseup`.
 *
 * @param {Event} inEvent The in event.
 */
ol.pointer.MouseSource.prototype.mouseup = function(inEvent) {
  if (!this.isEventSimulatedFromTouch_(inEvent)) {
    var p = this.pointerMap[ol.pointer.MouseSource.POINTER_ID.toString()];

    if (p && p.button === inEvent.button) {
      var e = ol.pointer.MouseSource.prepareEvent(inEvent, this.dispatcher);
      this.dispatcher.up(e, inEvent);
      this.cleanupMouse();
    }
  }
};


/**
 * Handler for `mouseover`.
 *
 * @param {Event} inEvent The in event.
 */
ol.pointer.MouseSource.prototype.mouseover = function(inEvent) {
  if (!this.isEventSimulatedFromTouch_(inEvent)) {
    var e = ol.pointer.MouseSource.prepareEvent(inEvent, this.dispatcher);
    this.dispatcher.enterOver(e, inEvent);
  }
};


/**
 * Handler for `mouseout`.
 *
 * @param {Event} inEvent The in event.
 */
ol.pointer.MouseSource.prototype.mouseout = function(inEvent) {
  if (!this.isEventSimulatedFromTouch_(inEvent)) {
    var e = ol.pointer.MouseSource.prepareEvent(inEvent, this.dispatcher);
    this.dispatcher.leaveOut(e, inEvent);
  }
};


/**
 * Dispatches a `pointercancel` event.
 *
 * @param {Event} inEvent The in event.
 */
ol.pointer.MouseSource.prototype.cancel = function(inEvent) {
  var e = ol.pointer.MouseSource.prepareEvent(inEvent, this.dispatcher);
  this.dispatcher.cancel(e, inEvent);
  this.cleanupMouse();
};


/**
 * Remove the mouse from the list of active pointers.
 */
ol.pointer.MouseSource.prototype.cleanupMouse = function() {
  delete this.pointerMap[ol.pointer.MouseSource.POINTER_ID.toString()];
};

// Based on https://github.com/Polymer/PointerEvents

// Copyright (c) 2013 The Polymer Authors. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

goog.provide('ol.pointer.MsSource');

goog.require('ol');
goog.require('ol.pointer.EventSource');


/**
 * @param {ol.pointer.PointerEventHandler} dispatcher Event handler.
 * @constructor
 * @extends {ol.pointer.EventSource}
 */
ol.pointer.MsSource = function(dispatcher) {
  var mapping = {
    'MSPointerDown': this.msPointerDown,
    'MSPointerMove': this.msPointerMove,
    'MSPointerUp': this.msPointerUp,
    'MSPointerOut': this.msPointerOut,
    'MSPointerOver': this.msPointerOver,
    'MSPointerCancel': this.msPointerCancel,
    'MSGotPointerCapture': this.msGotPointerCapture,
    'MSLostPointerCapture': this.msLostPointerCapture
  };
  ol.pointer.EventSource.call(this, dispatcher, mapping);

  /**
   * @const
   * @type {!Object.<string, Event|Object>}
   */
  this.pointerMap = dispatcher.pointerMap;

  /**
   * @const
   * @type {Array.<string>}
   */
  this.POINTER_TYPES = [
    '',
    'unavailable',
    'touch',
    'pen',
    'mouse'
  ];
};
ol.inherits(ol.pointer.MsSource, ol.pointer.EventSource);


/**
 * Creates a copy of the original event that will be used
 * for the fake pointer event.
 *
 * @private
 * @param {Event} inEvent The in event.
 * @return {Object} The copied event.
 */
ol.pointer.MsSource.prototype.prepareEvent_ = function(inEvent) {
  var e = inEvent;
  if (typeof inEvent.pointerType === 'number') {
    e = this.dispatcher.cloneEvent(inEvent, inEvent);
    e.pointerType = this.POINTER_TYPES[inEvent.pointerType];
  }

  return e;
};


/**
 * Remove this pointer from the list of active pointers.
 * @param {number} pointerId Pointer identifier.
 */
ol.pointer.MsSource.prototype.cleanup = function(pointerId) {
  delete this.pointerMap[pointerId.toString()];
};


/**
 * Handler for `msPointerDown`.
 *
 * @param {Event} inEvent The in event.
 */
ol.pointer.MsSource.prototype.msPointerDown = function(inEvent) {
  this.pointerMap[inEvent.pointerId.toString()] = inEvent;
  var e = this.prepareEvent_(inEvent);
  this.dispatcher.down(e, inEvent);
};


/**
 * Handler for `msPointerMove`.
 *
 * @param {Event} inEvent The in event.
 */
ol.pointer.MsSource.prototype.msPointerMove = function(inEvent) {
  var e = this.prepareEvent_(inEvent);
  this.dispatcher.move(e, inEvent);
};


/**
 * Handler for `msPointerUp`.
 *
 * @param {Event} inEvent The in event.
 */
ol.pointer.MsSource.prototype.msPointerUp = function(inEvent) {
  var e = this.prepareEvent_(inEvent);
  this.dispatcher.up(e, inEvent);
  this.cleanup(inEvent.pointerId);
};


/**
 * Handler for `msPointerOut`.
 *
 * @param {Event} inEvent The in event.
 */
ol.pointer.MsSource.prototype.msPointerOut = function(inEvent) {
  var e = this.prepareEvent_(inEvent);
  this.dispatcher.leaveOut(e, inEvent);
};


/**
 * Handler for `msPointerOver`.
 *
 * @param {Event} inEvent The in event.
 */
ol.pointer.MsSource.prototype.msPointerOver = function(inEvent) {
  var e = this.prepareEvent_(inEvent);
  this.dispatcher.enterOver(e, inEvent);
};


/**
 * Handler for `msPointerCancel`.
 *
 * @param {Event} inEvent The in event.
 */
ol.pointer.MsSource.prototype.msPointerCancel = function(inEvent) {
  var e = this.prepareEvent_(inEvent);
  this.dispatcher.cancel(e, inEvent);
  this.cleanup(inEvent.pointerId);
};


/**
 * Handler for `msLostPointerCapture`.
 *
 * @param {Event} inEvent The in event.
 */
ol.pointer.MsSource.prototype.msLostPointerCapture = function(inEvent) {
  var e = this.dispatcher.makeEvent('lostpointercapture',
      inEvent, inEvent);
  this.dispatcher.dispatchEvent(e);
};


/**
 * Handler for `msGotPointerCapture`.
 *
 * @param {Event} inEvent The in event.
 */
ol.pointer.MsSource.prototype.msGotPointerCapture = function(inEvent) {
  var e = this.dispatcher.makeEvent('gotpointercapture',
      inEvent, inEvent);
  this.dispatcher.dispatchEvent(e);
};

// Based on https://github.com/Polymer/PointerEvents

// Copyright (c) 2013 The Polymer Authors. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

goog.provide('ol.pointer.NativeSource');

goog.require('ol');
goog.require('ol.pointer.EventSource');


/**
 * @param {ol.pointer.PointerEventHandler} dispatcher Event handler.
 * @constructor
 * @extends {ol.pointer.EventSource}
 */
ol.pointer.NativeSource = function(dispatcher) {
  var mapping = {
    'pointerdown': this.pointerDown,
    'pointermove': this.pointerMove,
    'pointerup': this.pointerUp,
    'pointerout': this.pointerOut,
    'pointerover': this.pointerOver,
    'pointercancel': this.pointerCancel,
    'gotpointercapture': this.gotPointerCapture,
    'lostpointercapture': this.lostPointerCapture
  };
  ol.pointer.EventSource.call(this, dispatcher, mapping);
};
ol.inherits(ol.pointer.NativeSource, ol.pointer.EventSource);


/**
 * Handler for `pointerdown`.
 *
 * @param {Event} inEvent The in event.
 */
ol.pointer.NativeSource.prototype.pointerDown = function(inEvent) {
  this.dispatcher.fireNativeEvent(inEvent);
};


/**
 * Handler for `pointermove`.
 *
 * @param {Event} inEvent The in event.
 */
ol.pointer.NativeSource.prototype.pointerMove = function(inEvent) {
  this.dispatcher.fireNativeEvent(inEvent);
};


/**
 * Handler for `pointerup`.
 *
 * @param {Event} inEvent The in event.
 */
ol.pointer.NativeSource.prototype.pointerUp = function(inEvent) {
  this.dispatcher.fireNativeEvent(inEvent);
};


/**
 * Handler for `pointerout`.
 *
 * @param {Event} inEvent The in event.
 */
ol.pointer.NativeSource.prototype.pointerOut = function(inEvent) {
  this.dispatcher.fireNativeEvent(inEvent);
};


/**
 * Handler for `pointerover`.
 *
 * @param {Event} inEvent The in event.
 */
ol.pointer.NativeSource.prototype.pointerOver = function(inEvent) {
  this.dispatcher.fireNativeEvent(inEvent);
};


/**
 * Handler for `pointercancel`.
 *
 * @param {Event} inEvent The in event.
 */
ol.pointer.NativeSource.prototype.pointerCancel = function(inEvent) {
  this.dispatcher.fireNativeEvent(inEvent);
};


/**
 * Handler for `lostpointercapture`.
 *
 * @param {Event} inEvent The in event.
 */
ol.pointer.NativeSource.prototype.lostPointerCapture = function(inEvent) {
  this.dispatcher.fireNativeEvent(inEvent);
};


/**
 * Handler for `gotpointercapture`.
 *
 * @param {Event} inEvent The in event.
 */
ol.pointer.NativeSource.prototype.gotPointerCapture = function(inEvent) {
  this.dispatcher.fireNativeEvent(inEvent);
};

// Based on https://github.com/Polymer/PointerEvents

// Copyright (c) 2013 The Polymer Authors. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

goog.provide('ol.pointer.PointerEvent');


goog.require('ol');
goog.require('ol.events.Event');


/**
 * A class for pointer events.
 *
 * This class is used as an abstraction for mouse events,
 * touch events and even native pointer events.
 *
 * @constructor
 * @extends {ol.events.Event}
 * @param {string} type The type of the event to create.
 * @param {Event} originalEvent The event.
 * @param {Object.<string, ?>=} opt_eventDict An optional dictionary of
 *    initial event properties.
 */
ol.pointer.PointerEvent = function(type, originalEvent, opt_eventDict) {
  ol.events.Event.call(this, type);

  /**
   * @const
   * @type {Event}
   */
  this.originalEvent = originalEvent;

  var eventDict = opt_eventDict ? opt_eventDict : {};

  /**
   * @type {number}
   */
  this.buttons = this.getButtons_(eventDict);

  /**
   * @type {number}
   */
  this.pressure = this.getPressure_(eventDict, this.buttons);

  // MouseEvent related properties

  /**
   * @type {boolean}
   */
  this.bubbles = 'bubbles' in eventDict ? eventDict['bubbles'] : false;

  /**
   * @type {boolean}
   */
  this.cancelable = 'cancelable' in eventDict ? eventDict['cancelable'] : false;

  /**
   * @type {Object}
   */
  this.view = 'view' in eventDict ? eventDict['view'] : null;

  /**
   * @type {number}
   */
  this.detail = 'detail' in eventDict ? eventDict['detail'] : null;

  /**
   * @type {number}
   */
  this.screenX = 'screenX' in eventDict ? eventDict['screenX'] : 0;

  /**
   * @type {number}
   */
  this.screenY = 'screenY' in eventDict ? eventDict['screenY'] : 0;

  /**
   * @type {number}
   */
  this.clientX = 'clientX' in eventDict ? eventDict['clientX'] : 0;

  /**
   * @type {number}
   */
  this.clientY = 'clientY' in eventDict ? eventDict['clientY'] : 0;

  /**
   * @type {boolean}
   */
  this.ctrlKey = 'ctrlKey' in eventDict ? eventDict['ctrlKey'] : false;

  /**
   * @type {boolean}
   */
  this.altKey = 'altKey' in eventDict ? eventDict['altKey'] : false;

  /**
   * @type {boolean}
   */
  this.shiftKey = 'shiftKey' in eventDict ? eventDict['shiftKey'] : false;

  /**
   * @type {boolean}
   */
  this.metaKey = 'metaKey' in eventDict ? eventDict['metaKey'] : false;

  /**
   * @type {number}
   */
  this.button = 'button' in eventDict ? eventDict['button'] : 0;

  /**
   * @type {Node}
   */
  this.relatedTarget = 'relatedTarget' in eventDict ?
      eventDict['relatedTarget'] : null;

  // PointerEvent related properties

  /**
   * @const
   * @type {number}
   */
  this.pointerId = 'pointerId' in eventDict ? eventDict['pointerId'] : 0;

  /**
   * @type {number}
   */
  this.width = 'width' in eventDict ? eventDict['width'] : 0;

  /**
   * @type {number}
   */
  this.height = 'height' in eventDict ? eventDict['height'] : 0;

  /**
   * @type {number}
   */
  this.tiltX = 'tiltX' in eventDict ? eventDict['tiltX'] : 0;

  /**
   * @type {number}
   */
  this.tiltY = 'tiltY' in eventDict ? eventDict['tiltY'] : 0;

  /**
   * @type {string}
   */
  this.pointerType = 'pointerType' in eventDict ? eventDict['pointerType'] : '';

  /**
   * @type {number}
   */
  this.hwTimestamp = 'hwTimestamp' in eventDict ? eventDict['hwTimestamp'] : 0;

  /**
   * @type {boolean}
   */
  this.isPrimary = 'isPrimary' in eventDict ? eventDict['isPrimary'] : false;

  // keep the semantics of preventDefault
  if (originalEvent.preventDefault) {
    this.preventDefault = function() {
      originalEvent.preventDefault();
    };
  }
};
ol.inherits(ol.pointer.PointerEvent, ol.events.Event);


/**
 * @private
 * @param {Object.<string, ?>} eventDict The event dictionary.
 * @return {number} Button indicator.
 */
ol.pointer.PointerEvent.prototype.getButtons_ = function(eventDict) {
  // According to the w3c spec,
  // http://www.w3.org/TR/DOM-Level-3-Events/#events-MouseEvent-button
  // MouseEvent.button == 0 can mean either no mouse button depressed, or the
  // left mouse button depressed.
  //
  // As of now, the only way to distinguish between the two states of
  // MouseEvent.button is by using the deprecated MouseEvent.which property, as
  // this maps mouse buttons to positive integers > 0, and uses 0 to mean that
  // no mouse button is held.
  //
  // MouseEvent.which is derived from MouseEvent.button at MouseEvent creation,
  // but initMouseEvent does not expose an argument with which to set
  // MouseEvent.which. Calling initMouseEvent with a buttonArg of 0 will set
  // MouseEvent.button == 0 and MouseEvent.which == 1, breaking the expectations
  // of app developers.
  //
  // The only way to propagate the correct state of MouseEvent.which and
  // MouseEvent.button to a new MouseEvent.button == 0 and MouseEvent.which == 0
  // is to call initMouseEvent with a buttonArg value of -1.
  //
  // This is fixed with DOM Level 4's use of buttons
  var buttons;
  if (eventDict.buttons || ol.pointer.PointerEvent.HAS_BUTTONS) {
    buttons = eventDict.buttons;
  } else {
    switch (eventDict.which) {
      case 1: buttons = 1; break;
      case 2: buttons = 4; break;
      case 3: buttons = 2; break;
      default: buttons = 0;
    }
  }
  return buttons;
};


/**
 * @private
 * @param {Object.<string, ?>} eventDict The event dictionary.
 * @param {number} buttons Button indicator.
 * @return {number} The pressure.
 */
ol.pointer.PointerEvent.prototype.getPressure_ = function(eventDict, buttons) {
  // Spec requires that pointers without pressure specified use 0.5 for down
  // state and 0 for up state.
  var pressure = 0;
  if (eventDict.pressure) {
    pressure = eventDict.pressure;
  } else {
    pressure = buttons ? 0.5 : 0;
  }
  return pressure;
};


/**
 * Is the `buttons` property supported?
 * @type {boolean}
 */
ol.pointer.PointerEvent.HAS_BUTTONS = false;


/**
 * Checks if the `buttons` property is supported.
 */
(function() {
  try {
    var ev = new MouseEvent('click', {buttons: 1});
    ol.pointer.PointerEvent.HAS_BUTTONS = ev.buttons === 1;
  } catch (e) {
    // pass
  }
})();

// Based on https://github.com/Polymer/PointerEvents

// Copyright (c) 2013 The Polymer Authors. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

goog.provide('ol.pointer.TouchSource');

goog.require('ol');
goog.require('ol.array');
goog.require('ol.pointer.EventSource');
goog.require('ol.pointer.MouseSource');


/**
 * @constructor
 * @param {ol.pointer.PointerEventHandler} dispatcher The event handler.
 * @param {ol.pointer.MouseSource} mouseSource Mouse source.
 * @extends {ol.pointer.EventSource}
 */
ol.pointer.TouchSource = function(dispatcher, mouseSource) {
  var mapping = {
    'touchstart': this.touchstart,
    'touchmove': this.touchmove,
    'touchend': this.touchend,
    'touchcancel': this.touchcancel
  };
  ol.pointer.EventSource.call(this, dispatcher, mapping);

  /**
   * @const
   * @type {!Object.<string, Event|Object>}
   */
  this.pointerMap = dispatcher.pointerMap;

  /**
   * @const
   * @type {ol.pointer.MouseSource}
   */
  this.mouseSource = mouseSource;

  /**
   * @private
   * @type {number|undefined}
   */
  this.firstTouchId_ = undefined;

  /**
   * @private
   * @type {number}
   */
  this.clickCount_ = 0;

  /**
   * @private
   * @type {number|undefined}
   */
  this.resetId_ = undefined;
};
ol.inherits(ol.pointer.TouchSource, ol.pointer.EventSource);


/**
 * Mouse event timeout: This should be long enough to
 * ignore compat mouse events made by touch.
 * @const
 * @type {number}
 */
ol.pointer.TouchSource.DEDUP_TIMEOUT = 2500;


/**
 * @const
 * @type {number}
 */
ol.pointer.TouchSource.CLICK_COUNT_TIMEOUT = 200;


/**
 * @const
 * @type {string}
 */
ol.pointer.TouchSource.POINTER_TYPE = 'touch';


/**
 * @private
 * @param {Touch} inTouch The in touch.
 * @return {boolean} True, if this is the primary touch.
 */
ol.pointer.TouchSource.prototype.isPrimaryTouch_ = function(inTouch) {
  return this.firstTouchId_ === inTouch.identifier;
};


/**
 * Set primary touch if there are no pointers, or the only pointer is the mouse.
 * @param {Touch} inTouch The in touch.
 * @private
 */
ol.pointer.TouchSource.prototype.setPrimaryTouch_ = function(inTouch) {
  var count = Object.keys(this.pointerMap).length;
  if (count === 0 || (count === 1 &&
      ol.pointer.MouseSource.POINTER_ID.toString() in this.pointerMap)) {
    this.firstTouchId_ = inTouch.identifier;
    this.cancelResetClickCount_();
  }
};


/**
 * @private
 * @param {Object} inPointer The in pointer object.
 */
ol.pointer.TouchSource.prototype.removePrimaryPointer_ = function(inPointer) {
  if (inPointer.isPrimary) {
    this.firstTouchId_ = undefined;
    this.resetClickCount_();
  }
};


/**
 * @private
 */
ol.pointer.TouchSource.prototype.resetClickCount_ = function() {
  var global = ol.global;
  this.resetId_ = global.setTimeout(
      this.resetClickCountHandler_.bind(this),
      ol.pointer.TouchSource.CLICK_COUNT_TIMEOUT);
};


/**
 * @private
 */
ol.pointer.TouchSource.prototype.resetClickCountHandler_ = function() {
  this.clickCount_ = 0;
  this.resetId_ = undefined;
};


/**
 * @private
 */
ol.pointer.TouchSource.prototype.cancelResetClickCount_ = function() {
  var global = ol.global;
  if (this.resetId_ !== undefined) {
    global.clearTimeout(this.resetId_);
  }
};


/**
 * @private
 * @param {Event} browserEvent Browser event
 * @param {Touch} inTouch Touch event
 * @return {Object} A pointer object.
 */
ol.pointer.TouchSource.prototype.touchToPointer_ = function(browserEvent, inTouch) {
  var e = this.dispatcher.cloneEvent(browserEvent, inTouch);
  // Spec specifies that pointerId 1 is reserved for Mouse.
  // Touch identifiers can start at 0.
  // Add 2 to the touch identifier for compatibility.
  e.pointerId = inTouch.identifier + 2;
  // TODO: check if this is necessary?
  //e.target = findTarget(e);
  e.bubbles = true;
  e.cancelable = true;
  e.detail = this.clickCount_;
  e.button = 0;
  e.buttons = 1;
  e.width = inTouch.webkitRadiusX || inTouch.radiusX || 0;
  e.height = inTouch.webkitRadiusY || inTouch.radiusY || 0;
  e.pressure = inTouch.webkitForce || inTouch.force || 0.5;
  e.isPrimary = this.isPrimaryTouch_(inTouch);
  e.pointerType = ol.pointer.TouchSource.POINTER_TYPE;

  // make sure that the properties that are different for
  // each `Touch` object are not copied from the BrowserEvent object
  e.clientX = inTouch.clientX;
  e.clientY = inTouch.clientY;
  e.screenX = inTouch.screenX;
  e.screenY = inTouch.screenY;

  return e;
};


/**
 * @private
 * @param {Event} inEvent Touch event
 * @param {function(Event, Object)} inFunction In function.
 */
ol.pointer.TouchSource.prototype.processTouches_ = function(inEvent, inFunction) {
  var touches = Array.prototype.slice.call(
      inEvent.changedTouches);
  var count = touches.length;
  function preventDefault() {
    inEvent.preventDefault();
  }
  var i, pointer;
  for (i = 0; i < count; ++i) {
    pointer = this.touchToPointer_(inEvent, touches[i]);
    // forward touch preventDefaults
    pointer.preventDefault = preventDefault;
    inFunction.call(this, inEvent, pointer);
  }
};


/**
 * @private
 * @param {TouchList} touchList The touch list.
 * @param {number} searchId Search identifier.
 * @return {boolean} True, if the `Touch` with the given id is in the list.
 */
ol.pointer.TouchSource.prototype.findTouch_ = function(touchList, searchId) {
  var l = touchList.length;
  var touch;
  for (var i = 0; i < l; i++) {
    touch = touchList[i];
    if (touch.identifier === searchId) {
      return true;
    }
  }
  return false;
};


/**
 * In some instances, a touchstart can happen without a touchend. This
 * leaves the pointermap in a broken state.
 * Therefore, on every touchstart, we remove the touches that did not fire a
 * touchend event.
 * To keep state globally consistent, we fire a pointercancel for
 * this "abandoned" touch
 *
 * @private
 * @param {Event} inEvent The in event.
 */
ol.pointer.TouchSource.prototype.vacuumTouches_ = function(inEvent) {
  var touchList = inEvent.touches;
  // pointerMap.getCount() should be < touchList.length here,
  // as the touchstart has not been processed yet.
  var keys = Object.keys(this.pointerMap);
  var count = keys.length;
  if (count >= touchList.length) {
    var d = [];
    var i, key, value;
    for (i = 0; i < count; ++i) {
      key = keys[i];
      value = this.pointerMap[key];
      // Never remove pointerId == 1, which is mouse.
      // Touch identifiers are 2 smaller than their pointerId, which is the
      // index in pointermap.
      if (key != ol.pointer.MouseSource.POINTER_ID &&
          !this.findTouch_(touchList, key - 2)) {
        d.push(value.out);
      }
    }
    for (i = 0; i < d.length; ++i) {
      this.cancelOut_(inEvent, d[i]);
    }
  }
};


/**
 * Handler for `touchstart`, triggers `pointerover`,
 * `pointerenter` and `pointerdown` events.
 *
 * @param {Event} inEvent The in event.
 */
ol.pointer.TouchSource.prototype.touchstart = function(inEvent) {
  this.vacuumTouches_(inEvent);
  this.setPrimaryTouch_(inEvent.changedTouches[0]);
  this.dedupSynthMouse_(inEvent);
  this.clickCount_++;
  this.processTouches_(inEvent, this.overDown_);
};


/**
 * @private
 * @param {Event} browserEvent The event.
 * @param {Object} inPointer The in pointer object.
 */
ol.pointer.TouchSource.prototype.overDown_ = function(browserEvent, inPointer) {
  this.pointerMap[inPointer.pointerId] = {
    target: inPointer.target,
    out: inPointer,
    outTarget: inPointer.target
  };
  this.dispatcher.over(inPointer, browserEvent);
  this.dispatcher.enter(inPointer, browserEvent);
  this.dispatcher.down(inPointer, browserEvent);
};


/**
 * Handler for `touchmove`.
 *
 * @param {Event} inEvent The in event.
 */
ol.pointer.TouchSource.prototype.touchmove = function(inEvent) {
  inEvent.preventDefault();
  this.processTouches_(inEvent, this.moveOverOut_);
};


/**
 * @private
 * @param {Event} browserEvent The event.
 * @param {Object} inPointer The in pointer.
 */
ol.pointer.TouchSource.prototype.moveOverOut_ = function(browserEvent, inPointer) {
  var event = inPointer;
  var pointer = this.pointerMap[event.pointerId];
  // a finger drifted off the screen, ignore it
  if (!pointer) {
    return;
  }
  var outEvent = pointer.out;
  var outTarget = pointer.outTarget;
  this.dispatcher.move(event, browserEvent);
  if (outEvent && outTarget !== event.target) {
    outEvent.relatedTarget = event.target;
    event.relatedTarget = outTarget;
    // recover from retargeting by shadow
    outEvent.target = outTarget;
    if (event.target) {
      this.dispatcher.leaveOut(outEvent, browserEvent);
      this.dispatcher.enterOver(event, browserEvent);
    } else {
      // clean up case when finger leaves the screen
      event.target = outTarget;
      event.relatedTarget = null;
      this.cancelOut_(browserEvent, event);
    }
  }
  pointer.out = event;
  pointer.outTarget = event.target;
};


/**
 * Handler for `touchend`, triggers `pointerup`,
 * `pointerout` and `pointerleave` events.
 *
 * @param {Event} inEvent The event.
 */
ol.pointer.TouchSource.prototype.touchend = function(inEvent) {
  this.dedupSynthMouse_(inEvent);
  this.processTouches_(inEvent, this.upOut_);
};


/**
 * @private
 * @param {Event} browserEvent An event.
 * @param {Object} inPointer The inPointer object.
 */
ol.pointer.TouchSource.prototype.upOut_ = function(browserEvent, inPointer) {
  this.dispatcher.up(inPointer, browserEvent);
  this.dispatcher.out(inPointer, browserEvent);
  this.dispatcher.leave(inPointer, browserEvent);
  this.cleanUpPointer_(inPointer);
};


/**
 * Handler for `touchcancel`, triggers `pointercancel`,
 * `pointerout` and `pointerleave` events.
 *
 * @param {Event} inEvent The in event.
 */
ol.pointer.TouchSource.prototype.touchcancel = function(inEvent) {
  this.processTouches_(inEvent, this.cancelOut_);
};


/**
 * @private
 * @param {Event} browserEvent The event.
 * @param {Object} inPointer The in pointer.
 */
ol.pointer.TouchSource.prototype.cancelOut_ = function(browserEvent, inPointer) {
  this.dispatcher.cancel(inPointer, browserEvent);
  this.dispatcher.out(inPointer, browserEvent);
  this.dispatcher.leave(inPointer, browserEvent);
  this.cleanUpPointer_(inPointer);
};


/**
 * @private
 * @param {Object} inPointer The inPointer object.
 */
ol.pointer.TouchSource.prototype.cleanUpPointer_ = function(inPointer) {
  delete this.pointerMap[inPointer.pointerId];
  this.removePrimaryPointer_(inPointer);
};


/**
 * Prevent synth mouse events from creating pointer events.
 *
 * @private
 * @param {Event} inEvent The in event.
 */
ol.pointer.TouchSource.prototype.dedupSynthMouse_ = function(inEvent) {
  var lts = this.mouseSource.lastTouches;
  var t = inEvent.changedTouches[0];
  // only the primary finger will synth mouse events
  if (this.isPrimaryTouch_(t)) {
    // remember x/y of last touch
    var lt = [t.clientX, t.clientY];
    lts.push(lt);

    var global = ol.global;
    global.setTimeout(function() {
      // remove touch after timeout
      ol.array.remove(lts, lt);
    }, ol.pointer.TouchSource.DEDUP_TIMEOUT);
  }
};

// Based on https://github.com/Polymer/PointerEvents

// Copyright (c) 2013 The Polymer Authors. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

goog.provide('ol.pointer.PointerEventHandler');

goog.require('ol');
goog.require('ol.events');
goog.require('ol.events.EventTarget');

goog.require('ol.has');
goog.require('ol.pointer.MouseSource');
goog.require('ol.pointer.MsSource');
goog.require('ol.pointer.NativeSource');
goog.require('ol.pointer.PointerEvent');
goog.require('ol.pointer.TouchSource');


/**
 * @constructor
 * @extends {ol.events.EventTarget}
 * @param {Element|HTMLDocument} element Viewport element.
 */
ol.pointer.PointerEventHandler = function(element) {
  ol.events.EventTarget.call(this);

  /**
   * @const
   * @private
   * @type {Element|HTMLDocument}
   */
  this.element_ = element;

  /**
   * @const
   * @type {!Object.<string, Event|Object>}
   */
  this.pointerMap = {};

  /**
   * @type {Object.<string, function(Event)>}
   * @private
   */
  this.eventMap_ = {};

  /**
   * @type {Array.<ol.pointer.EventSource>}
   * @private
   */
  this.eventSourceList_ = [];

  this.registerSources();
};
ol.inherits(ol.pointer.PointerEventHandler, ol.events.EventTarget);


/**
 * Set up the event sources (mouse, touch and native pointers)
 * that generate pointer events.
 */
ol.pointer.PointerEventHandler.prototype.registerSources = function() {
  if (ol.has.POINTER) {
    this.registerSource('native', new ol.pointer.NativeSource(this));
  } else if (ol.has.MSPOINTER) {
    this.registerSource('ms', new ol.pointer.MsSource(this));
  } else {
    var mouseSource = new ol.pointer.MouseSource(this);
    this.registerSource('mouse', mouseSource);

    if (ol.has.TOUCH) {
      this.registerSource('touch',
          new ol.pointer.TouchSource(this, mouseSource));
    }
  }

  // register events on the viewport element
  this.register_();
};


/**
 * Add a new event source that will generate pointer events.
 *
 * @param {string} name A name for the event source
 * @param {ol.pointer.EventSource} source The source event.
 */
ol.pointer.PointerEventHandler.prototype.registerSource = function(name, source) {
  var s = source;
  var newEvents = s.getEvents();

  if (newEvents) {
    newEvents.forEach(function(e) {
      var handler = s.getHandlerForEvent(e);

      if (handler) {
        this.eventMap_[e] = handler.bind(s);
      }
    }, this);
    this.eventSourceList_.push(s);
  }
};


/**
 * Set up the events for all registered event sources.
 * @private
 */
ol.pointer.PointerEventHandler.prototype.register_ = function() {
  var l = this.eventSourceList_.length;
  var eventSource;
  for (var i = 0; i < l; i++) {
    eventSource = this.eventSourceList_[i];
    this.addEvents_(eventSource.getEvents());
  }
};


/**
 * Remove all registered events.
 * @private
 */
ol.pointer.PointerEventHandler.prototype.unregister_ = function() {
  var l = this.eventSourceList_.length;
  var eventSource;
  for (var i = 0; i < l; i++) {
    eventSource = this.eventSourceList_[i];
    this.removeEvents_(eventSource.getEvents());
  }
};


/**
 * Calls the right handler for a new event.
 * @private
 * @param {Event} inEvent Browser event.
 */
ol.pointer.PointerEventHandler.prototype.eventHandler_ = function(inEvent) {
  var type = inEvent.type;
  var handler = this.eventMap_[type];
  if (handler) {
    handler(inEvent);
  }
};


/**
 * Setup listeners for the given events.
 * @private
 * @param {Array.<string>} events List of events.
 */
ol.pointer.PointerEventHandler.prototype.addEvents_ = function(events) {
  events.forEach(function(eventName) {
    ol.events.listen(this.element_, eventName, this.eventHandler_, this);
  }, this);
};


/**
 * Unregister listeners for the given events.
 * @private
 * @param {Array.<string>} events List of events.
 */
ol.pointer.PointerEventHandler.prototype.removeEvents_ = function(events) {
  events.forEach(function(e) {
    ol.events.unlisten(this.element_, e, this.eventHandler_, this);
  }, this);
};


/**
 * Returns a snapshot of inEvent, with writable properties.
 *
 * @param {Event} event Browser event.
 * @param {Event|Touch} inEvent An event that contains
 *    properties to copy.
 * @return {Object} An object containing shallow copies of
 *    `inEvent`'s properties.
 */
ol.pointer.PointerEventHandler.prototype.cloneEvent = function(event, inEvent) {
  var eventCopy = {}, p;
  for (var i = 0, ii = ol.pointer.CLONE_PROPS.length; i < ii; i++) {
    p = ol.pointer.CLONE_PROPS[i][0];
    eventCopy[p] = event[p] || inEvent[p] || ol.pointer.CLONE_PROPS[i][1];
  }

  return eventCopy;
};


// EVENTS


/**
 * Triggers a 'pointerdown' event.
 * @param {Object} data Pointer event data.
 * @param {Event} event The event.
 */
ol.pointer.PointerEventHandler.prototype.down = function(data, event) {
  this.fireEvent(ol.pointer.EventType.POINTERDOWN, data, event);
};


/**
 * Triggers a 'pointermove' event.
 * @param {Object} data Pointer event data.
 * @param {Event} event The event.
 */
ol.pointer.PointerEventHandler.prototype.move = function(data, event) {
  this.fireEvent(ol.pointer.EventType.POINTERMOVE, data, event);
};


/**
 * Triggers a 'pointerup' event.
 * @param {Object} data Pointer event data.
 * @param {Event} event The event.
 */
ol.pointer.PointerEventHandler.prototype.up = function(data, event) {
  this.fireEvent(ol.pointer.EventType.POINTERUP, data, event);
};


/**
 * Triggers a 'pointerenter' event.
 * @param {Object} data Pointer event data.
 * @param {Event} event The event.
 */
ol.pointer.PointerEventHandler.prototype.enter = function(data, event) {
  data.bubbles = false;
  this.fireEvent(ol.pointer.EventType.POINTERENTER, data, event);
};


/**
 * Triggers a 'pointerleave' event.
 * @param {Object} data Pointer event data.
 * @param {Event} event The event.
 */
ol.pointer.PointerEventHandler.prototype.leave = function(data, event) {
  data.bubbles = false;
  this.fireEvent(ol.pointer.EventType.POINTERLEAVE, data, event);
};


/**
 * Triggers a 'pointerover' event.
 * @param {Object} data Pointer event data.
 * @param {Event} event The event.
 */
ol.pointer.PointerEventHandler.prototype.over = function(data, event) {
  data.bubbles = true;
  this.fireEvent(ol.pointer.EventType.POINTEROVER, data, event);
};


/**
 * Triggers a 'pointerout' event.
 * @param {Object} data Pointer event data.
 * @param {Event} event The event.
 */
ol.pointer.PointerEventHandler.prototype.out = function(data, event) {
  data.bubbles = true;
  this.fireEvent(ol.pointer.EventType.POINTEROUT, data, event);
};


/**
 * Triggers a 'pointercancel' event.
 * @param {Object} data Pointer event data.
 * @param {Event} event The event.
 */
ol.pointer.PointerEventHandler.prototype.cancel = function(data, event) {
  this.fireEvent(ol.pointer.EventType.POINTERCANCEL, data, event);
};


/**
 * Triggers a combination of 'pointerout' and 'pointerleave' events.
 * @param {Object} data Pointer event data.
 * @param {Event} event The event.
 */
ol.pointer.PointerEventHandler.prototype.leaveOut = function(data, event) {
  this.out(data, event);
  if (!this.contains_(data.target, data.relatedTarget)) {
    this.leave(data, event);
  }
};


/**
 * Triggers a combination of 'pointerover' and 'pointerevents' events.
 * @param {Object} data Pointer event data.
 * @param {Event} event The event.
 */
ol.pointer.PointerEventHandler.prototype.enterOver = function(data, event) {
  this.over(data, event);
  if (!this.contains_(data.target, data.relatedTarget)) {
    this.enter(data, event);
  }
};


/**
 * @private
 * @param {Element} container The container element.
 * @param {Element} contained The contained element.
 * @return {boolean} Returns true if the container element
 *   contains the other element.
 */
ol.pointer.PointerEventHandler.prototype.contains_ = function(container, contained) {
  if (!container || !contained) {
    return false;
  }
  return container.contains(contained);
};


// EVENT CREATION AND TRACKING
/**
 * Creates a new Event of type `inType`, based on the information in
 * `data`.
 *
 * @param {string} inType A string representing the type of event to create.
 * @param {Object} data Pointer event data.
 * @param {Event} event The event.
 * @return {ol.pointer.PointerEvent} A PointerEvent of type `inType`.
 */
ol.pointer.PointerEventHandler.prototype.makeEvent = function(inType, data, event) {
  return new ol.pointer.PointerEvent(inType, event, data);
};


/**
 * Make and dispatch an event in one call.
 * @param {string} inType A string representing the type of event.
 * @param {Object} data Pointer event data.
 * @param {Event} event The event.
 */
ol.pointer.PointerEventHandler.prototype.fireEvent = function(inType, data, event) {
  var e = this.makeEvent(inType, data, event);
  this.dispatchEvent(e);
};


/**
 * Creates a pointer event from a native pointer event
 * and dispatches this event.
 * @param {Event} event A platform event with a target.
 */
ol.pointer.PointerEventHandler.prototype.fireNativeEvent = function(event) {
  var e = this.makeEvent(event.type, event, event);
  this.dispatchEvent(e);
};


/**
 * Wrap a native mouse event into a pointer event.
 * This proxy method is required for the legacy IE support.
 * @param {string} eventType The pointer event type.
 * @param {Event} event The event.
 * @return {ol.pointer.PointerEvent} The wrapped event.
 */
ol.pointer.PointerEventHandler.prototype.wrapMouseEvent = function(eventType, event) {
  var pointerEvent = this.makeEvent(
      eventType, ol.pointer.MouseSource.prepareEvent(event, this), event);
  return pointerEvent;
};


/**
 * @inheritDoc
 */
ol.pointer.PointerEventHandler.prototype.disposeInternal = function() {
  this.unregister_();
  ol.events.EventTarget.prototype.disposeInternal.call(this);
};


/**
 * Constants for event names.
 * @enum {string}
 */
ol.pointer.EventType = {
  POINTERMOVE: 'pointermove',
  POINTERDOWN: 'pointerdown',
  POINTERUP: 'pointerup',
  POINTEROVER: 'pointerover',
  POINTEROUT: 'pointerout',
  POINTERENTER: 'pointerenter',
  POINTERLEAVE: 'pointerleave',
  POINTERCANCEL: 'pointercancel'
};


/**
 * Properties to copy when cloning an event, with default values.
 * @type {Array.<Array>}
 */
ol.pointer.CLONE_PROPS = [
  // MouseEvent
  ['bubbles', false],
  ['cancelable', false],
  ['view', null],
  ['detail', null],
  ['screenX', 0],
  ['screenY', 0],
  ['clientX', 0],
  ['clientY', 0],
  ['ctrlKey', false],
  ['altKey', false],
  ['shiftKey', false],
  ['metaKey', false],
  ['button', 0],
  ['relatedTarget', null],
  // DOM Level 3
  ['buttons', 0],
  // PointerEvent
  ['pointerId', 0],
  ['width', 0],
  ['height', 0],
  ['pressure', 0],
  ['tiltX', 0],
  ['tiltY', 0],
  ['pointerType', ''],
  ['hwTimestamp', 0],
  ['isPrimary', false],
  // event instance
  ['type', ''],
  ['target', null],
  ['currentTarget', null],
  ['which', 0]
];

goog.provide('ol.MapBrowserEvent');
goog.provide('ol.MapBrowserEvent.EventType');
goog.provide('ol.MapBrowserEventHandler');
goog.provide('ol.MapBrowserPointerEvent');

goog.require('ol');
goog.require('ol.MapEvent');
goog.require('ol.events');
goog.require('ol.events.EventTarget');
goog.require('ol.events.EventType');
goog.require('ol.pointer.PointerEventHandler');


/**
 * @classdesc
 * Events emitted as map browser events are instances of this type.
 * See {@link ol.Map} for which events trigger a map browser event.
 *
 * @constructor
 * @extends {ol.MapEvent}
 * @implements {oli.MapBrowserEvent}
 * @param {string} type Event type.
 * @param {ol.Map} map Map.
 * @param {Event} browserEvent Browser event.
 * @param {boolean=} opt_dragging Is the map currently being dragged?
 * @param {?olx.FrameState=} opt_frameState Frame state.
 */
ol.MapBrowserEvent = function(type, map, browserEvent, opt_dragging,
    opt_frameState) {

  ol.MapEvent.call(this, type, map, opt_frameState);

  /**
   * The original browser event.
   * @const
   * @type {Event}
   * @api stable
   */
  this.originalEvent = browserEvent;

  /**
   * The pixel of the original browser event.
   * @type {ol.Pixel}
   * @api stable
   */
  this.pixel = map.getEventPixel(browserEvent);

  /**
   * The coordinate of the original browser event.
   * @type {ol.Coordinate}
   * @api stable
   */
  this.coordinate = map.getCoordinateFromPixel(this.pixel);

  /**
   * Indicates if the map is currently being dragged. Only set for
   * `POINTERDRAG` and `POINTERMOVE` events. Default is `false`.
   *
   * @type {boolean}
   * @api stable
   */
  this.dragging = opt_dragging !== undefined ? opt_dragging : false;

};
ol.inherits(ol.MapBrowserEvent, ol.MapEvent);


/**
 * Prevents the default browser action.
 * @see https://developer.mozilla.org/en-US/docs/Web/API/event.preventDefault
 * @override
 * @api stable
 */
ol.MapBrowserEvent.prototype.preventDefault = function() {
  ol.MapEvent.prototype.preventDefault.call(this);
  this.originalEvent.preventDefault();
};


/**
 * Prevents further propagation of the current event.
 * @see https://developer.mozilla.org/en-US/docs/Web/API/event.stopPropagation
 * @override
 * @api stable
 */
ol.MapBrowserEvent.prototype.stopPropagation = function() {
  ol.MapEvent.prototype.stopPropagation.call(this);
  this.originalEvent.stopPropagation();
};


/**
 * @constructor
 * @extends {ol.MapBrowserEvent}
 * @param {string} type Event type.
 * @param {ol.Map} map Map.
 * @param {ol.pointer.PointerEvent} pointerEvent Pointer event.
 * @param {boolean=} opt_dragging Is the map currently being dragged?
 * @param {?olx.FrameState=} opt_frameState Frame state.
 */
ol.MapBrowserPointerEvent = function(type, map, pointerEvent, opt_dragging,
    opt_frameState) {

  ol.MapBrowserEvent.call(this, type, map, pointerEvent.originalEvent, opt_dragging,
      opt_frameState);

  /**
   * @const
   * @type {ol.pointer.PointerEvent}
   */
  this.pointerEvent = pointerEvent;

};
ol.inherits(ol.MapBrowserPointerEvent, ol.MapBrowserEvent);


/**
 * @param {ol.Map} map The map with the viewport to listen to events on.
 * @constructor
 * @extends {ol.events.EventTarget}
 */
ol.MapBrowserEventHandler = function(map) {

  ol.events.EventTarget.call(this);

  /**
   * This is the element that we will listen to the real events on.
   * @type {ol.Map}
   * @private
   */
  this.map_ = map;

  /**
   * @type {number}
   * @private
   */
  this.clickTimeoutId_ = 0;

  /**
   * @type {boolean}
   * @private
   */
  this.dragging_ = false;

  /**
   * @type {!Array.<ol.EventsKey>}
   * @private
   */
  this.dragListenerKeys_ = [];

  /**
   * The most recent "down" type event (or null if none have occurred).
   * Set on pointerdown.
   * @type {ol.pointer.PointerEvent}
   * @private
   */
  this.down_ = null;

  var element = this.map_.getViewport();

  /**
   * @type {number}
   * @private
   */
  this.activePointers_ = 0;

  /**
   * @type {!Object.<number, boolean>}
   * @private
   */
  this.trackedTouches_ = {};

  /**
   * Event handler which generates pointer events for
   * the viewport element.
   *
   * @type {ol.pointer.PointerEventHandler}
   * @private
   */
  this.pointerEventHandler_ = new ol.pointer.PointerEventHandler(element);

  /**
   * Event handler which generates pointer events for
   * the document (used when dragging).
   *
   * @type {ol.pointer.PointerEventHandler}
   * @private
   */
  this.documentPointerEventHandler_ = null;

  /**
   * @type {?ol.EventsKey}
   * @private
   */
  this.pointerdownListenerKey_ = ol.events.listen(this.pointerEventHandler_,
      ol.pointer.EventType.POINTERDOWN,
      this.handlePointerDown_, this);

  /**
   * @type {?ol.EventsKey}
   * @private
   */
  this.relayedListenerKey_ = ol.events.listen(this.pointerEventHandler_,
      ol.pointer.EventType.POINTERMOVE,
      this.relayEvent_, this);

};
ol.inherits(ol.MapBrowserEventHandler, ol.events.EventTarget);


/**
 * @param {ol.pointer.PointerEvent} pointerEvent Pointer event.
 * @private
 */
ol.MapBrowserEventHandler.prototype.emulateClick_ = function(pointerEvent) {
  var newEvent;
  newEvent = new ol.MapBrowserPointerEvent(
      ol.MapBrowserEvent.EventType.CLICK, this.map_, pointerEvent);
  this.dispatchEvent(newEvent);
  if (this.clickTimeoutId_ !== 0) {
    // double-click
    ol.global.clearTimeout(this.clickTimeoutId_);
    this.clickTimeoutId_ = 0;
    newEvent = new ol.MapBrowserPointerEvent(
        ol.MapBrowserEvent.EventType.DBLCLICK, this.map_, pointerEvent);
    this.dispatchEvent(newEvent);
  } else {
    // click
    this.clickTimeoutId_ = ol.global.setTimeout(function() {
      this.clickTimeoutId_ = 0;
      var newEvent = new ol.MapBrowserPointerEvent(
          ol.MapBrowserEvent.EventType.SINGLECLICK, this.map_, pointerEvent);
      this.dispatchEvent(newEvent);
    }.bind(this), 250);
  }
};


/**
 * Keeps track on how many pointers are currently active.
 *
 * @param {ol.pointer.PointerEvent} pointerEvent Pointer event.
 * @private
 */
ol.MapBrowserEventHandler.prototype.updateActivePointers_ = function(pointerEvent) {
  var event = pointerEvent;

  if (event.type == ol.MapBrowserEvent.EventType.POINTERUP ||
      event.type == ol.MapBrowserEvent.EventType.POINTERCANCEL) {
    delete this.trackedTouches_[event.pointerId];
  } else if (event.type == ol.MapBrowserEvent.EventType.POINTERDOWN) {
    this.trackedTouches_[event.pointerId] = true;
  }
  this.activePointers_ = Object.keys(this.trackedTouches_).length;
};


/**
 * @param {ol.pointer.PointerEvent} pointerEvent Pointer event.
 * @private
 */
ol.MapBrowserEventHandler.prototype.handlePointerUp_ = function(pointerEvent) {
  this.updateActivePointers_(pointerEvent);
  var newEvent = new ol.MapBrowserPointerEvent(
      ol.MapBrowserEvent.EventType.POINTERUP, this.map_, pointerEvent);
  this.dispatchEvent(newEvent);

  // We emulate click events on left mouse button click, touch contact, and pen
  // contact. isMouseActionButton returns true in these cases (evt.button is set
  // to 0).
  // See http://www.w3.org/TR/pointerevents/#button-states
  if (!this.dragging_ && this.isMouseActionButton_(pointerEvent)) {
    goog.DEBUG && console.assert(this.down_, 'this.down_ must be truthy');
    this.emulateClick_(this.down_);
  }

  goog.DEBUG && console.assert(this.activePointers_ >= 0,
      'this.activePointers_ should be equal to or larger than 0');
  if (this.activePointers_ === 0) {
    this.dragListenerKeys_.forEach(ol.events.unlistenByKey);
    this.dragListenerKeys_.length = 0;
    this.dragging_ = false;
    this.down_ = null;
    this.documentPointerEventHandler_.dispose();
    this.documentPointerEventHandler_ = null;
  }
};


/**
 * @param {ol.pointer.PointerEvent} pointerEvent Pointer event.
 * @return {boolean} If the left mouse button was pressed.
 * @private
 */
ol.MapBrowserEventHandler.prototype.isMouseActionButton_ = function(pointerEvent) {
  return pointerEvent.button === 0;
};


/**
 * @param {ol.pointer.PointerEvent} pointerEvent Pointer event.
 * @private
 */
ol.MapBrowserEventHandler.prototype.handlePointerDown_ = function(pointerEvent) {
  this.updateActivePointers_(pointerEvent);
  var newEvent = new ol.MapBrowserPointerEvent(
      ol.MapBrowserEvent.EventType.POINTERDOWN, this.map_, pointerEvent);
  this.dispatchEvent(newEvent);

  this.down_ = pointerEvent;

  if (this.dragListenerKeys_.length === 0) {
    /* Set up a pointer event handler on the `document`,
     * which is required when the pointer is moved outside
     * the viewport when dragging.
     */
    this.documentPointerEventHandler_ =
        new ol.pointer.PointerEventHandler(document);

    this.dragListenerKeys_.push(
      ol.events.listen(this.documentPointerEventHandler_,
          ol.MapBrowserEvent.EventType.POINTERMOVE,
          this.handlePointerMove_, this),
      ol.events.listen(this.documentPointerEventHandler_,
          ol.MapBrowserEvent.EventType.POINTERUP,
          this.handlePointerUp_, this),
      /* Note that the listener for `pointercancel is set up on
       * `pointerEventHandler_` and not `documentPointerEventHandler_` like
       * the `pointerup` and `pointermove` listeners.
       *
       * The reason for this is the following: `TouchSource.vacuumTouches_()`
       * issues `pointercancel` events, when there was no `touchend` for a
       * `touchstart`. Now, let's say a first `touchstart` is registered on
       * `pointerEventHandler_`. The `documentPointerEventHandler_` is set up.
       * But `documentPointerEventHandler_` doesn't know about the first
       * `touchstart`. If there is no `touchend` for the `touchstart`, we can
       * only receive a `touchcancel` from `pointerEventHandler_`, because it is
       * only registered there.
       */
      ol.events.listen(this.pointerEventHandler_,
          ol.MapBrowserEvent.EventType.POINTERCANCEL,
          this.handlePointerUp_, this)
    );
  }
};


/**
 * @param {ol.pointer.PointerEvent} pointerEvent Pointer event.
 * @private
 */
ol.MapBrowserEventHandler.prototype.handlePointerMove_ = function(pointerEvent) {
  // Fix IE10 on windows Surface : When you tap the tablet, it triggers
  // multiple pointermove events between pointerdown and pointerup with
  // the exact same coordinates of the pointerdown event. To avoid a
  // 'false' touchmove event to be dispatched , we test if the pointer
  // effectively moved.
  if (this.isMoving_(pointerEvent)) {
    this.dragging_ = true;
    var newEvent = new ol.MapBrowserPointerEvent(
        ol.MapBrowserEvent.EventType.POINTERDRAG, this.map_, pointerEvent,
        this.dragging_);
    this.dispatchEvent(newEvent);
  }

  // Some native android browser triggers mousemove events during small period
  // of time. See: https://code.google.com/p/android/issues/detail?id=5491 or
  // https://code.google.com/p/android/issues/detail?id=19827
  // ex: Galaxy Tab P3110 + Android 4.1.1
  pointerEvent.preventDefault();
};


/**
 * Wrap and relay a pointer event.  Note that this requires that the type
 * string for the MapBrowserPointerEvent matches the PointerEvent type.
 * @param {ol.pointer.PointerEvent} pointerEvent Pointer event.
 * @private
 */
ol.MapBrowserEventHandler.prototype.relayEvent_ = function(pointerEvent) {
  var dragging = !!(this.down_ && this.isMoving_(pointerEvent));
  this.dispatchEvent(new ol.MapBrowserPointerEvent(
      pointerEvent.type, this.map_, pointerEvent, dragging));
};


/**
 * @param {ol.pointer.PointerEvent} pointerEvent Pointer event.
 * @return {boolean} Is moving.
 * @private
 */
ol.MapBrowserEventHandler.prototype.isMoving_ = function(pointerEvent) {
  return pointerEvent.clientX != this.down_.clientX ||
      pointerEvent.clientY != this.down_.clientY;
};


/**
 * @inheritDoc
 */
ol.MapBrowserEventHandler.prototype.disposeInternal = function() {
  if (this.relayedListenerKey_) {
    ol.events.unlistenByKey(this.relayedListenerKey_);
    this.relayedListenerKey_ = null;
  }
  if (this.pointerdownListenerKey_) {
    ol.events.unlistenByKey(this.pointerdownListenerKey_);
    this.pointerdownListenerKey_ = null;
  }

  this.dragListenerKeys_.forEach(ol.events.unlistenByKey);
  this.dragListenerKeys_.length = 0;

  if (this.documentPointerEventHandler_) {
    this.documentPointerEventHandler_.dispose();
    this.documentPointerEventHandler_ = null;
  }
  if (this.pointerEventHandler_) {
    this.pointerEventHandler_.dispose();
    this.pointerEventHandler_ = null;
  }
  ol.events.EventTarget.prototype.disposeInternal.call(this);
};


/**
 * Constants for event names.
 * @enum {string}
 */
ol.MapBrowserEvent.EventType = {

  /**
   * A true single click with no dragging and no double click. Note that this
   * event is delayed by 250 ms to ensure that it is not a double click.
   * @event ol.MapBrowserEvent#singleclick
   * @api stable
   */
  SINGLECLICK: 'singleclick',

  /**
   * A click with no dragging. A double click will fire two of this.
   * @event ol.MapBrowserEvent#click
   * @api stable
   */
  CLICK: ol.events.EventType.CLICK,

  /**
   * A true double click, with no dragging.
   * @event ol.MapBrowserEvent#dblclick
   * @api stable
   */
  DBLCLICK: ol.events.EventType.DBLCLICK,

  /**
   * Triggered when a pointer is dragged.
   * @event ol.MapBrowserEvent#pointerdrag
   * @api
   */
  POINTERDRAG: 'pointerdrag',

  /**
   * Triggered when a pointer is moved. Note that on touch devices this is
   * triggered when the map is panned, so is not the same as mousemove.
   * @event ol.MapBrowserEvent#pointermove
   * @api stable
   */
  POINTERMOVE: 'pointermove',

  POINTERDOWN: 'pointerdown',
  POINTERUP: 'pointerup',
  POINTEROVER: 'pointerover',
  POINTEROUT: 'pointerout',
  POINTERENTER: 'pointerenter',
  POINTERLEAVE: 'pointerleave',
  POINTERCANCEL: 'pointercancel'
};

goog.provide('ol.layer.Base');
goog.provide('ol.layer.LayerProperty');

goog.require('ol');
goog.require('ol.Object');
goog.require('ol.math');
goog.require('ol.obj');


/**
 * @enum {string}
 */
ol.layer.LayerProperty = {
  OPACITY: 'opacity',
  VISIBLE: 'visible',
  EXTENT: 'extent',
  Z_INDEX: 'zIndex',
  MAX_RESOLUTION: 'maxResolution',
  MIN_RESOLUTION: 'minResolution',
  SOURCE: 'source'
};


/**
 * @classdesc
 * Abstract base class; normally only used for creating subclasses and not
 * instantiated in apps.
 * Note that with `ol.layer.Base` and all its subclasses, any property set in
 * the options is set as a {@link ol.Object} property on the layer object, so
 * is observable, and has get/set accessors.
 *
 * @constructor
 * @extends {ol.Object}
 * @param {olx.layer.BaseOptions} options Layer options.
 * @api stable
 */
ol.layer.Base = function(options) {

  ol.Object.call(this);

  /**
   * @type {Object.<string, *>}
   */
  var properties = ol.obj.assign({}, options);
  properties[ol.layer.LayerProperty.OPACITY] =
      options.opacity !== undefined ? options.opacity : 1;
  properties[ol.layer.LayerProperty.VISIBLE] =
      options.visible !== undefined ? options.visible : true;
  properties[ol.layer.LayerProperty.Z_INDEX] =
      options.zIndex !== undefined ? options.zIndex : 0;
  properties[ol.layer.LayerProperty.MAX_RESOLUTION] =
      options.maxResolution !== undefined ? options.maxResolution : Infinity;
  properties[ol.layer.LayerProperty.MIN_RESOLUTION] =
      options.minResolution !== undefined ? options.minResolution : 0;

  this.setProperties(properties);
};
ol.inherits(ol.layer.Base, ol.Object);


/**
 * @return {ol.LayerState} Layer state.
 */
ol.layer.Base.prototype.getLayerState = function() {
  var opacity = this.getOpacity();
  var sourceState = this.getSourceState();
  var visible = this.getVisible();
  var extent = this.getExtent();
  var zIndex = this.getZIndex();
  var maxResolution = this.getMaxResolution();
  var minResolution = this.getMinResolution();
  return {
    layer: /** @type {ol.layer.Layer} */ (this),
    opacity: ol.math.clamp(opacity, 0, 1),
    sourceState: sourceState,
    visible: visible,
    managed: true,
    extent: extent,
    zIndex: zIndex,
    maxResolution: maxResolution,
    minResolution: Math.max(minResolution, 0)
  };
};


/**
 * @abstract
 * @param {Array.<ol.layer.Layer>=} opt_array Array of layers (to be
 *     modified in place).
 * @return {Array.<ol.layer.Layer>} Array of layers.
 */
ol.layer.Base.prototype.getLayersArray = function(opt_array) {};


/**
 * @abstract
 * @param {Array.<ol.LayerState>=} opt_states Optional list of layer
 *     states (to be modified in place).
 * @return {Array.<ol.LayerState>} List of layer states.
 */
ol.layer.Base.prototype.getLayerStatesArray = function(opt_states) {};


/**
 * Return the {@link ol.Extent extent} of the layer or `undefined` if it
 * will be visible regardless of extent.
 * @return {ol.Extent|undefined} The layer extent.
 * @observable
 * @api stable
 */
ol.layer.Base.prototype.getExtent = function() {
  return /** @type {ol.Extent|undefined} */ (
      this.get(ol.layer.LayerProperty.EXTENT));
};


/**
 * Return the maximum resolution of the layer.
 * @return {number} The maximum resolution of the layer.
 * @observable
 * @api stable
 */
ol.layer.Base.prototype.getMaxResolution = function() {
  return /** @type {number} */ (
      this.get(ol.layer.LayerProperty.MAX_RESOLUTION));
};


/**
 * Return the minimum resolution of the layer.
 * @return {number} The minimum resolution of the layer.
 * @observable
 * @api stable
 */
ol.layer.Base.prototype.getMinResolution = function() {
  return /** @type {number} */ (
      this.get(ol.layer.LayerProperty.MIN_RESOLUTION));
};


/**
 * Return the opacity of the layer (between 0 and 1).
 * @return {number} The opacity of the layer.
 * @observable
 * @api stable
 */
ol.layer.Base.prototype.getOpacity = function() {
  return /** @type {number} */ (this.get(ol.layer.LayerProperty.OPACITY));
};


/**
 * @abstract
 * @return {ol.source.State} Source state.
 */
ol.layer.Base.prototype.getSourceState = function() {};


/**
 * Return the visibility of the layer (`true` or `false`).
 * @return {boolean} The visibility of the layer.
 * @observable
 * @api stable
 */
ol.layer.Base.prototype.getVisible = function() {
  return /** @type {boolean} */ (this.get(ol.layer.LayerProperty.VISIBLE));
};


/**
 * Return the Z-index of the layer, which is used to order layers before
 * rendering. The default Z-index is 0.
 * @return {number} The Z-index of the layer.
 * @observable
 * @api
 */
ol.layer.Base.prototype.getZIndex = function() {
  return /** @type {number} */ (this.get(ol.layer.LayerProperty.Z_INDEX));
};


/**
 * Set the extent at which the layer is visible.  If `undefined`, the layer
 * will be visible at all extents.
 * @param {ol.Extent|undefined} extent The extent of the layer.
 * @observable
 * @api stable
 */
ol.layer.Base.prototype.setExtent = function(extent) {
  this.set(ol.layer.LayerProperty.EXTENT, extent);
};


/**
 * Set the maximum resolution at which the layer is visible.
 * @param {number} maxResolution The maximum resolution of the layer.
 * @observable
 * @api stable
 */
ol.layer.Base.prototype.setMaxResolution = function(maxResolution) {
  this.set(ol.layer.LayerProperty.MAX_RESOLUTION, maxResolution);
};


/**
 * Set the minimum resolution at which the layer is visible.
 * @param {number} minResolution The minimum resolution of the layer.
 * @observable
 * @api stable
 */
ol.layer.Base.prototype.setMinResolution = function(minResolution) {
  this.set(ol.layer.LayerProperty.MIN_RESOLUTION, minResolution);
};


/**
 * Set the opacity of the layer, allowed values range from 0 to 1.
 * @param {number} opacity The opacity of the layer.
 * @observable
 * @api stable
 */
ol.layer.Base.prototype.setOpacity = function(opacity) {
  this.set(ol.layer.LayerProperty.OPACITY, opacity);
};


/**
 * Set the visibility of the layer (`true` or `false`).
 * @param {boolean} visible The visibility of the layer.
 * @observable
 * @api stable
 */
ol.layer.Base.prototype.setVisible = function(visible) {
  this.set(ol.layer.LayerProperty.VISIBLE, visible);
};


/**
 * Set Z-index of the layer, which is used to order layers before rendering.
 * The default Z-index is 0.
 * @param {number} zindex The z-index of the layer.
 * @observable
 * @api
 */
ol.layer.Base.prototype.setZIndex = function(zindex) {
  this.set(ol.layer.LayerProperty.Z_INDEX, zindex);
};

goog.provide('ol.render.Event');
goog.provide('ol.render.EventType');

goog.require('ol');
goog.require('ol.events.Event');


/**
 * @enum {string}
 */
ol.render.EventType = {
  /**
   * @event ol.render.Event#postcompose
   * @api
   */
  POSTCOMPOSE: 'postcompose',
  /**
   * @event ol.render.Event#precompose
   * @api
   */
  PRECOMPOSE: 'precompose',
  /**
   * @event ol.render.Event#render
   * @api
   */
  RENDER: 'render'
};


/**
 * @constructor
 * @extends {ol.events.Event}
 * @implements {oli.render.Event}
 * @param {ol.render.EventType} type Type.
 * @param {ol.render.VectorContext=} opt_vectorContext Vector context.
 * @param {olx.FrameState=} opt_frameState Frame state.
 * @param {?CanvasRenderingContext2D=} opt_context Context.
 * @param {?ol.webgl.Context=} opt_glContext WebGL Context.
 */
ol.render.Event = function(
    type, opt_vectorContext, opt_frameState, opt_context,
    opt_glContext) {

  ol.events.Event.call(this, type);

  /**
   * For canvas, this is an instance of {@link ol.render.canvas.Immediate}.
   * @type {ol.render.VectorContext|undefined}
   * @api
   */
  this.vectorContext = opt_vectorContext;

  /**
   * An object representing the current render frame state.
   * @type {olx.FrameState|undefined}
   * @api
   */
  this.frameState = opt_frameState;

  /**
   * Canvas context. Only available when a Canvas renderer is used, null
   * otherwise.
   * @type {CanvasRenderingContext2D|null|undefined}
   * @api
   */
  this.context = opt_context;

  /**
   * WebGL context. Only available when a WebGL renderer is used, null
   * otherwise.
   * @type {ol.webgl.Context|null|undefined}
   * @api
   */
  this.glContext = opt_glContext;

};
ol.inherits(ol.render.Event, ol.events.Event);

goog.provide('ol.source.Source');
goog.provide('ol.source.State');

goog.require('ol');
goog.require('ol.Attribution');
goog.require('ol.Object');
goog.require('ol.proj');


/**
 * State of the source, one of 'undefined', 'loading', 'ready' or 'error'.
 * @enum {string}
 */
ol.source.State = {
  UNDEFINED: 'undefined',
  LOADING: 'loading',
  READY: 'ready',
  ERROR: 'error'
};


/**
 * @classdesc
 * Abstract base class; normally only used for creating subclasses and not
 * instantiated in apps.
 * Base class for {@link ol.layer.Layer} sources.
 *
 * A generic `change` event is triggered when the state of the source changes.
 *
 * @constructor
 * @extends {ol.Object}
 * @param {ol.SourceSourceOptions} options Source options.
 * @api stable
 */
ol.source.Source = function(options) {

  ol.Object.call(this);

  /**
   * @private
   * @type {ol.proj.Projection}
   */
  this.projection_ = ol.proj.get(options.projection);

  /**
   * @private
   * @type {Array.<ol.Attribution>}
   */
  this.attributions_ = ol.source.Source.toAttributionsArray_(options.attributions);

  /**
   * @private
   * @type {string|olx.LogoOptions|undefined}
   */
  this.logo_ = options.logo;

  /**
   * @private
   * @type {ol.source.State}
   */
  this.state_ = options.state !== undefined ?
      options.state : ol.source.State.READY;

  /**
   * @private
   * @type {boolean}
   */
  this.wrapX_ = options.wrapX !== undefined ? options.wrapX : false;

};
ol.inherits(ol.source.Source, ol.Object);

/**
 * Turns various ways of defining an attribution to an array of `ol.Attributions`.
 *
 * @param {ol.AttributionLike|undefined}
 *     attributionLike The attributions as string, array of strings,
 *     `ol.Attribution`, array of `ol.Attribution` or undefined.
 * @return {Array.<ol.Attribution>} The array of `ol.Attribution` or null if
 *     `undefined` was given.
 */
ol.source.Source.toAttributionsArray_ = function(attributionLike) {
  if (typeof attributionLike === 'string') {
    return [new ol.Attribution({html: attributionLike})];
  } else if (attributionLike instanceof ol.Attribution) {
    return [attributionLike];
  } else if (Array.isArray(attributionLike)) {
    var len = attributionLike.length;
    var attributions = new Array(len);
    for (var i = 0; i < len; i++) {
      var item = attributionLike[i];
      if (typeof item === 'string') {
        attributions[i] = new ol.Attribution({html: item});
      } else {
        attributions[i] = item;
      }
    }
    return attributions;
  } else {
    return null;
  }
};


/**
 * @param {ol.Coordinate} coordinate Coordinate.
 * @param {number} resolution Resolution.
 * @param {number} rotation Rotation.
 * @param {Object.<string, boolean>} skippedFeatureUids Skipped feature uids.
 * @param {function((ol.Feature|ol.render.Feature)): T} callback Feature
 *     callback.
 * @return {T|undefined} Callback result.
 * @template T
 */
ol.source.Source.prototype.forEachFeatureAtCoordinate = ol.nullFunction;


/**
 * Get the attributions of the source.
 * @return {Array.<ol.Attribution>} Attributions.
 * @api stable
 */
ol.source.Source.prototype.getAttributions = function() {
  return this.attributions_;
};


/**
 * Get the logo of the source.
 * @return {string|olx.LogoOptions|undefined} Logo.
 * @api stable
 */
ol.source.Source.prototype.getLogo = function() {
  return this.logo_;
};


/**
 * Get the projection of the source.
 * @return {ol.proj.Projection} Projection.
 * @api
 */
ol.source.Source.prototype.getProjection = function() {
  return this.projection_;
};


/**
 * @abstract
 * @return {Array.<number>|undefined} Resolutions.
 */
ol.source.Source.prototype.getResolutions = function() {};


/**
 * Get the state of the source, see {@link ol.source.State} for possible states.
 * @return {ol.source.State} State.
 * @api
 */
ol.source.Source.prototype.getState = function() {
  return this.state_;
};


/**
 * @return {boolean|undefined} Wrap X.
 */
ol.source.Source.prototype.getWrapX = function() {
  return this.wrapX_;
};


/**
 * Refreshes the source and finally dispatches a 'change' event.
 * @api
 */
ol.source.Source.prototype.refresh = function() {
  this.changed();
};


/**
 * Set the attributions of the source.
 * @param {ol.AttributionLike|undefined} attributions Attributions.
 *     Can be passed as `string`, `Array<string>`, `{@link ol.Attribution}`,
 *     `Array<{@link ol.Attribution}>` or `undefined`.
 * @api
 */
ol.source.Source.prototype.setAttributions = function(attributions) {
  this.attributions_ = ol.source.Source.toAttributionsArray_(attributions);
  this.changed();
};


/**
 * Set the logo of the source.
 * @param {string|olx.LogoOptions|undefined} logo Logo.
 */
ol.source.Source.prototype.setLogo = function(logo) {
  this.logo_ = logo;
};


/**
 * Set the state of the source.
 * @param {ol.source.State} state State.
 * @protected
 */
ol.source.Source.prototype.setState = function(state) {
  this.state_ = state;
  this.changed();
};

goog.provide('ol.layer.Layer');

goog.require('ol.events');
goog.require('ol.events.EventType');
goog.require('ol');
goog.require('ol.Object');
goog.require('ol.layer.Base');
goog.require('ol.layer.LayerProperty');
goog.require('ol.obj');
goog.require('ol.render.EventType');
goog.require('ol.source.State');


/**
 * @classdesc
 * Abstract base class; normally only used for creating subclasses and not
 * instantiated in apps.
 * A visual representation of raster or vector map data.
 * Layers group together those properties that pertain to how the data is to be
 * displayed, irrespective of the source of that data.
 *
 * Layers are usually added to a map with {@link ol.Map#addLayer}. Components
 * like {@link ol.interaction.Select} use unmanaged layers internally. These
 * unmanaged layers are associated with the map using
 * {@link ol.layer.Layer#setMap} instead.
 *
 * A generic `change` event is fired when the state of the source changes.
 *
 * @constructor
 * @extends {ol.layer.Base}
 * @fires ol.render.Event
 * @param {olx.layer.LayerOptions} options Layer options.
 * @api stable
 */
ol.layer.Layer = function(options) {

  var baseOptions = ol.obj.assign({}, options);
  delete baseOptions.source;

  ol.layer.Base.call(this, /** @type {olx.layer.BaseOptions} */ (baseOptions));

  /**
   * @private
   * @type {?ol.EventsKey}
   */
  this.mapPrecomposeKey_ = null;

  /**
   * @private
   * @type {?ol.EventsKey}
   */
  this.mapRenderKey_ = null;

  /**
   * @private
   * @type {?ol.EventsKey}
   */
  this.sourceChangeKey_ = null;

  if (options.map) {
    this.setMap(options.map);
  }

  ol.events.listen(this,
      ol.Object.getChangeEventType(ol.layer.LayerProperty.SOURCE),
      this.handleSourcePropertyChange_, this);

  var source = options.source ? options.source : null;
  this.setSource(source);
};
ol.inherits(ol.layer.Layer, ol.layer.Base);


/**
 * Return `true` if the layer is visible, and if the passed resolution is
 * between the layer's minResolution and maxResolution. The comparison is
 * inclusive for `minResolution` and exclusive for `maxResolution`.
 * @param {ol.LayerState} layerState Layer state.
 * @param {number} resolution Resolution.
 * @return {boolean} The layer is visible at the given resolution.
 */
ol.layer.Layer.visibleAtResolution = function(layerState, resolution) {
  return layerState.visible && resolution >= layerState.minResolution &&
      resolution < layerState.maxResolution;
};


/**
 * @inheritDoc
 */
ol.layer.Layer.prototype.getLayersArray = function(opt_array) {
  var array = opt_array ? opt_array : [];
  array.push(this);
  return array;
};


/**
 * @inheritDoc
 */
ol.layer.Layer.prototype.getLayerStatesArray = function(opt_states) {
  var states = opt_states ? opt_states : [];
  states.push(this.getLayerState());
  return states;
};


/**
 * Get the layer source.
 * @return {ol.source.Source} The layer source (or `null` if not yet set).
 * @observable
 * @api stable
 */
ol.layer.Layer.prototype.getSource = function() {
  var source = this.get(ol.layer.LayerProperty.SOURCE);
  return /** @type {ol.source.Source} */ (source) || null;
};


/**
  * @inheritDoc
  */
ol.layer.Layer.prototype.getSourceState = function() {
  var source = this.getSource();
  return !source ? ol.source.State.UNDEFINED : source.getState();
};


/**
 * @private
 */
ol.layer.Layer.prototype.handleSourceChange_ = function() {
  this.changed();
};


/**
 * @private
 */
ol.layer.Layer.prototype.handleSourcePropertyChange_ = function() {
  if (this.sourceChangeKey_) {
    ol.events.unlistenByKey(this.sourceChangeKey_);
    this.sourceChangeKey_ = null;
  }
  var source = this.getSource();
  if (source) {
    this.sourceChangeKey_ = ol.events.listen(source,
        ol.events.EventType.CHANGE, this.handleSourceChange_, this);
  }
  this.changed();
};


/**
 * Sets the layer to be rendered on top of other layers on a map. The map will
 * not manage this layer in its layers collection, and the callback in
 * {@link ol.Map#forEachLayerAtPixel} will receive `null` as layer. This
 * is useful for temporary layers. To remove an unmanaged layer from the map,
 * use `#setMap(null)`.
 *
 * To add the layer to a map and have it managed by the map, use
 * {@link ol.Map#addLayer} instead.
 * @param {ol.Map} map Map.
 * @api
 */
ol.layer.Layer.prototype.setMap = function(map) {
  if (this.mapPrecomposeKey_) {
    ol.events.unlistenByKey(this.mapPrecomposeKey_);
    this.mapPrecomposeKey_ = null;
  }
  if (!map) {
    this.changed();
  }
  if (this.mapRenderKey_) {
    ol.events.unlistenByKey(this.mapRenderKey_);
    this.mapRenderKey_ = null;
  }
  if (map) {
    this.mapPrecomposeKey_ = ol.events.listen(
        map, ol.render.EventType.PRECOMPOSE, function(evt) {
          var layerState = this.getLayerState();
          layerState.managed = false;
          layerState.zIndex = Infinity;
          evt.frameState.layerStatesArray.push(layerState);
          evt.frameState.layerStates[ol.getUid(this)] = layerState;
        }, this);
    this.mapRenderKey_ = ol.events.listen(
        this, ol.events.EventType.CHANGE, map.render, map);
    this.changed();
  }
};


/**
 * Set the layer source.
 * @param {ol.source.Source} source The layer source.
 * @observable
 * @api stable
 */
ol.layer.Layer.prototype.setSource = function(source) {
  this.set(ol.layer.LayerProperty.SOURCE, source);
};

goog.provide('ol.style.IconImageCache');

goog.require('ol.color');


/**
 * @constructor
 */
ol.style.IconImageCache = function() {

  /**
   * @type {Object.<string, ol.style.IconImage>}
   * @private
   */
  this.cache_ = {};

  /**
   * @type {number}
   * @private
   */
  this.cacheSize_ = 0;

  /**
   * @const
   * @type {number}
   * @private
   */
  this.maxCacheSize_ = 32;
};


/**
 * @param {string} src Src.
 * @param {?string} crossOrigin Cross origin.
 * @param {ol.Color} color Color.
 * @return {string} Cache key.
 */
ol.style.IconImageCache.getKey = function(src, crossOrigin, color) {
  goog.DEBUG && console.assert(crossOrigin !== undefined,
      'argument crossOrigin must be defined');
  var colorString = color ? ol.color.asString(color) : 'null';
  return crossOrigin + ':' + src + ':' + colorString;
};


/**
 * FIXME empty description for jsdoc
 */
ol.style.IconImageCache.prototype.clear = function() {
  this.cache_ = {};
  this.cacheSize_ = 0;
};


/**
 * FIXME empty description for jsdoc
 */
ol.style.IconImageCache.prototype.expire = function() {
  if (this.cacheSize_ > this.maxCacheSize_) {
    var i = 0;
    var key, iconImage;
    for (key in this.cache_) {
      iconImage = this.cache_[key];
      if ((i++ & 3) === 0 && !iconImage.hasListener()) {
        delete this.cache_[key];
        --this.cacheSize_;
      }
    }
  }
};


/**
 * @param {string} src Src.
 * @param {?string} crossOrigin Cross origin.
 * @param {ol.Color} color Color.
 * @return {ol.style.IconImage} Icon image.
 */
ol.style.IconImageCache.prototype.get = function(src, crossOrigin, color) {
  var key = ol.style.IconImageCache.getKey(src, crossOrigin, color);
  return key in this.cache_ ? this.cache_[key] : null;
};


/**
 * @param {string} src Src.
 * @param {?string} crossOrigin Cross origin.
 * @param {ol.Color} color Color.
 * @param {ol.style.IconImage} iconImage Icon image.
 */
ol.style.IconImageCache.prototype.set = function(src, crossOrigin, color,
                                                 iconImage) {
  var key = ol.style.IconImageCache.getKey(src, crossOrigin, color);
  this.cache_[key] = iconImage;
  ++this.cacheSize_;
};

goog.provide('ol.style');

goog.require('ol.style.IconImageCache');

ol.style.iconImageCache = new ol.style.IconImageCache();

goog.provide('ol.transform');

goog.require('ol.asserts');


/**
 * Collection of affine 2d transformation functions. The functions work on an
 * array of 6 elements. The element order is compatible with the [SVGMatrix
 * interface](https://developer.mozilla.org/en-US/docs/Web/API/SVGMatrix) and is
 * a subset (elements a to f) of a 3x3 martrix:
 * ```
 * [ a c e ]
 * [ b d f ]
 * [ 0 0 1 ]
 * ```
 */


/**
 * @private
 * @type {ol.Transform}
 */
ol.transform.tmp_ = new Array(6);


/**
 * Create an identity transform.
 * @return {!ol.Transform} Identity transform.
 */
ol.transform.create = function() {
  return [1, 0, 0, 1, 0, 0];
};


/**
 * Resets the given transform to an identity transform.
 * @param {!ol.Transform} transform Transform.
 * @return {!ol.Transform} Transform.
 */
ol.transform.reset = function(transform) {
  return ol.transform.set(transform, 1, 0, 0, 1, 0, 0);
};


/**
 * Multiply the underlying matrices of two transforms and return the result in
 * the first transform.
 * @param {!ol.Transform} transform1 Transform parameters of matrix 1.
 * @param {!ol.Transform} transform2 Transform parameters of matrix 2.
 * @return {!ol.Transform} transform1 multiplied with transform2.
 */
ol.transform.multiply = function(transform1, transform2) {
  var a1 = transform1[0];
  var b1 = transform1[1];
  var c1 = transform1[2];
  var d1 = transform1[3];
  var e1 = transform1[4];
  var f1 = transform1[5];
  var a2 = transform2[0];
  var b2 = transform2[1];
  var c2 = transform2[2];
  var d2 = transform2[3];
  var e2 = transform2[4];
  var f2 = transform2[5];

  transform1[0] = a1 * a2 + c1 * b2;
  transform1[1] = b1 * a2 + d1 * b2;
  transform1[2] = a1 * c2 + c1 * d2;
  transform1[3] = b1 * c2 + d1 * d2;
  transform1[4] = a1 * e2 + c1 * f2 + e1;
  transform1[5] = b1 * e2 + d1 * f2 + f1;

  return transform1;
};

/**
 * Set the transform components a-f on a given transform.
 * @param {!ol.Transform} transform Transform.
 * @param {number} a The a component of the transform.
 * @param {number} b The b component of the transform.
 * @param {number} c The c component of the transform.
 * @param {number} d The d component of the transform.
 * @param {number} e The e component of the transform.
 * @param {number} f The f component of the transform.
 * @return {!ol.Transform} Matrix with transform applied.
 */
ol.transform.set = function(transform, a, b, c, d, e, f) {
  transform[0] = a;
  transform[1] = b;
  transform[2] = c;
  transform[3] = d;
  transform[4] = e;
  transform[5] = f;
  return transform;
};


/**
 * Set transform on one matrix from another matrix.
 * @param {!ol.Transform} transform1 Matrix to set transform to.
 * @param {!ol.Transform} transform2 Matrix to set transform from.
 * @return {!ol.Transform} transform1 with transform from transform2 applied.
 */
ol.transform.setFromArray = function(transform1, transform2) {
  transform1[0] = transform2[0];
  transform1[1] = transform2[1];
  transform1[2] = transform2[2];
  transform1[3] = transform2[3];
  transform1[4] = transform2[4];
  transform1[5] = transform2[5];
  return transform1;
};


/**
 * Transforms the given coordinate with the given transform returning the
 * resulting, transformed coordinate. The coordinate will be modified in-place.
 *
 * @param {ol.Transform} transform The transformation.
 * @param {ol.Coordinate|ol.Pixel} coordinate The coordinate to transform.
 * @return {ol.Coordinate|ol.Pixel} return coordinate so that operations can be
 *     chained together.
 */
ol.transform.apply = function(transform, coordinate) {
  var x = coordinate[0], y = coordinate[1];
  coordinate[0] = transform[0] * x + transform[2] * y + transform[4];
  coordinate[1] = transform[1] * x + transform[3] * y + transform[5];
  return coordinate;
};


/**
 * Applies rotation to the given transform.
 * @param {!ol.Transform} transform Transform.
 * @param {number} angle Angle in radians.
 * @return {!ol.Transform} The rotated transform.
 */
ol.transform.rotate = function(transform, angle) {
  var cos = Math.cos(angle);
  var sin = Math.sin(angle);
  return ol.transform.multiply(transform,
      ol.transform.set(ol.transform.tmp_, cos, sin, -sin, cos, 0, 0));
};


/**
 * Applies scale to a given transform.
 * @param {!ol.Transform} transform Transform.
 * @param {number} x Scale factor x.
 * @param {number} y Scale factor y.
 * @return {!ol.Transform} The scaled transform.
 */
ol.transform.scale = function(transform, x, y) {
  return ol.transform.multiply(transform,
      ol.transform.set(ol.transform.tmp_, x, 0, 0, y, 0, 0));
};


/**
 * Applies translation to the given transform.
 * @param {!ol.Transform} transform Transform.
 * @param {number} dx Translation x.
 * @param {number} dy Translation y.
 * @return {!ol.Transform} The translated transform.
 */
ol.transform.translate = function(transform, dx, dy) {
  return ol.transform.multiply(transform,
      ol.transform.set(ol.transform.tmp_, 1, 0, 0, 1, dx, dy));
};


/**
 * Creates a composite transform given an initial translation, scale, rotation, and
 * final translation (in that order only, not commutative).
 * @param {!ol.Transform} transform The transform (will be modified in place).
 * @param {number} dx1 Initial translation x.
 * @param {number} dy1 Initial translation y.
 * @param {number} sx Scale factor x.
 * @param {number} sy Scale factor y.
 * @param {number} angle Rotation (in counter-clockwise radians).
 * @param {number} dx2 Final translation x.
 * @param {number} dy2 Final translation y.
 * @return {!ol.Transform} The composite transform.
 */
ol.transform.compose = function(transform, dx1, dy1, sx, sy, angle, dx2, dy2) {
  var sin = Math.sin(angle);
  var cos = Math.cos(angle);
  transform[0] = sx * cos;
  transform[1] = sy * sin;
  transform[2] = -sx * sin;
  transform[3] = sy * cos;
  transform[4] = dx2 * sx * cos - dy2 * sx * sin + dx1;
  transform[5] = dx2 * sy * sin + dy2 * sy * cos + dy1;
  return transform;
};


/**
 * Invert the given transform.
 * @param {!ol.Transform} transform Transform.
 * @return {!ol.Transform} Inverse of the transform.
 */
ol.transform.invert = function(transform) {
  var det = ol.transform.determinant(transform);
  ol.asserts.assert(det !== 0, 32); // Transformation matrix cannot be inverted

  var a = transform[0];
  var b = transform[1];
  var c = transform[2];
  var d = transform[3];
  var e = transform[4];
  var f = transform[5];

  transform[0] = d / det;
  transform[1] = -b / det;
  transform[2] = -c / det;
  transform[3] = a / det;
  transform[4] = (c * f - d * e) / det;
  transform[5] = -(a * f - b * e) / det;

  return transform;
};


/**
 * Returns the determinant of the given matrix.
 * @param {!ol.Transform} mat Matrix.
 * @return {number} Determinant.
 */
ol.transform.determinant = function(mat) {
  return mat[0] * mat[3] - mat[1] * mat[2];
};

goog.provide('ol.renderer.Map');
goog.provide('ol.RendererType');

goog.require('ol');
goog.require('ol.Disposable');
goog.require('ol.events');
goog.require('ol.events.EventType');
goog.require('ol.extent');
goog.require('ol.functions');
goog.require('ol.layer.Layer');
goog.require('ol.style');
goog.require('ol.transform');


/**
 * Available renderers: `'canvas'`, `'dom'` or `'webgl'`.
 * @enum {string}
 */
ol.RendererType = {
  CANVAS: 'canvas',
  DOM: 'dom',
  WEBGL: 'webgl'
};


/**
 * @constructor
 * @extends {ol.Disposable}
 * @param {Element} container Container.
 * @param {ol.Map} map Map.
 * @struct
 */
ol.renderer.Map = function(container, map) {

  ol.Disposable.call(this);


  /**
   * @private
   * @type {ol.Map}
   */
  this.map_ = map;

  /**
   * @private
   * @type {Object.<string, ol.renderer.Layer>}
   */
  this.layerRenderers_ = {};

  /**
   * @private
   * @type {Object.<string, ol.EventsKey>}
   */
  this.layerRendererListeners_ = {};

};
ol.inherits(ol.renderer.Map, ol.Disposable);


/**
 * @param {olx.FrameState} frameState FrameState.
 * @protected
 */
ol.renderer.Map.prototype.calculateMatrices2D = function(frameState) {
  var viewState = frameState.viewState;
  var coordinateToPixelTransform = frameState.coordinateToPixelTransform;
  var pixelToCoordinateTransform = frameState.pixelToCoordinateTransform;
  goog.DEBUG && console.assert(coordinateToPixelTransform,
      'frameState has a coordinateToPixelTransform');

  ol.transform.compose(coordinateToPixelTransform,
      frameState.size[0] / 2, frameState.size[1] / 2,
      1 / viewState.resolution, -1 / viewState.resolution,
      -viewState.rotation,
      -viewState.center[0], -viewState.center[1]);

  ol.transform.invert(
      ol.transform.setFromArray(pixelToCoordinateTransform, coordinateToPixelTransform));
};


/**
 * @abstract
 * @param {ol.layer.Layer} layer Layer.
 * @protected
 * @return {ol.renderer.Layer} layerRenderer Layer renderer.
 */
ol.renderer.Map.prototype.createLayerRenderer = function(layer) {};


/**
 * @inheritDoc
 */
ol.renderer.Map.prototype.disposeInternal = function() {
  for (var id in this.layerRenderers_) {
    this.layerRenderers_[id].dispose();
  }
};


/**
 * @param {ol.Map} map Map.
 * @param {olx.FrameState} frameState Frame state.
 * @private
 */
ol.renderer.Map.expireIconCache_ = function(map, frameState) {
  var cache = ol.style.iconImageCache;
  cache.expire();
};


/**
 * @param {ol.Coordinate} coordinate Coordinate.
 * @param {olx.FrameState} frameState FrameState.
 * @param {function(this: S, (ol.Feature|ol.render.Feature),
 *     ol.layer.Layer): T} callback Feature callback.
 * @param {S} thisArg Value to use as `this` when executing `callback`.
 * @param {function(this: U, ol.layer.Layer): boolean} layerFilter Layer filter
 *     function, only layers which are visible and for which this function
 *     returns `true` will be tested for features.  By default, all visible
 *     layers will be tested.
 * @param {U} thisArg2 Value to use as `this` when executing `layerFilter`.
 * @return {T|undefined} Callback result.
 * @template S,T,U
 */
ol.renderer.Map.prototype.forEachFeatureAtCoordinate = function(coordinate, frameState, callback, thisArg,
        layerFilter, thisArg2) {
  var result;
  var viewState = frameState.viewState;
  var viewResolution = viewState.resolution;

  /**
   * @param {ol.Feature|ol.render.Feature} feature Feature.
   * @param {ol.layer.Layer} layer Layer.
   * @return {?} Callback result.
   */
  function forEachFeatureAtCoordinate(feature, layer) {
    var key = ol.getUid(feature).toString();
    var managed = frameState.layerStates[ol.getUid(layer)].managed;
    if (!(key in frameState.skippedFeatureUids && !managed)) {
      return callback.call(thisArg, feature, managed ? layer : null);
    }
  }

  var projection = viewState.projection;

  var translatedCoordinate = coordinate;
  if (projection.canWrapX()) {
    var projectionExtent = projection.getExtent();
    var worldWidth = ol.extent.getWidth(projectionExtent);
    var x = coordinate[0];
    if (x < projectionExtent[0] || x > projectionExtent[2]) {
      var worldsAway = Math.ceil((projectionExtent[0] - x) / worldWidth);
      translatedCoordinate = [x + worldWidth * worldsAway, coordinate[1]];
    }
  }

  var layerStates = frameState.layerStatesArray;
  var numLayers = layerStates.length;
  var i;
  for (i = numLayers - 1; i >= 0; --i) {
    var layerState = layerStates[i];
    var layer = layerState.layer;
    if (ol.layer.Layer.visibleAtResolution(layerState, viewResolution) &&
        layerFilter.call(thisArg2, layer)) {
      var layerRenderer = this.getLayerRenderer(layer);
      if (layer.getSource()) {
        result = layerRenderer.forEachFeatureAtCoordinate(
            layer.getSource().getWrapX() ? translatedCoordinate : coordinate,
            frameState, forEachFeatureAtCoordinate, thisArg);
      }
      if (result) {
        return result;
      }
    }
  }
  return undefined;
};


/**
 * @param {ol.Pixel} pixel Pixel.
 * @param {olx.FrameState} frameState FrameState.
 * @param {function(this: S, ol.layer.Layer, ol.Color): T} callback Layer
 *     callback.
 * @param {S} thisArg Value to use as `this` when executing `callback`.
 * @param {function(this: U, ol.layer.Layer): boolean} layerFilter Layer filter
 *     function, only layers which are visible and for which this function
 *     returns `true` will be tested for features.  By default, all visible
 *     layers will be tested.
 * @param {U} thisArg2 Value to use as `this` when executing `layerFilter`.
 * @return {T|undefined} Callback result.
 * @template S,T,U
 */
ol.renderer.Map.prototype.forEachLayerAtPixel = function(pixel, frameState, callback, thisArg,
        layerFilter, thisArg2) {
  var result;
  var viewState = frameState.viewState;
  var viewResolution = viewState.resolution;

  var layerStates = frameState.layerStatesArray;
  var numLayers = layerStates.length;
  var i;
  for (i = numLayers - 1; i >= 0; --i) {
    var layerState = layerStates[i];
    var layer = layerState.layer;
    if (ol.layer.Layer.visibleAtResolution(layerState, viewResolution) &&
        layerFilter.call(thisArg2, layer)) {
      var layerRenderer = this.getLayerRenderer(layer);
      result = layerRenderer.forEachLayerAtPixel(
          pixel, frameState, callback, thisArg);
      if (result) {
        return result;
      }
    }
  }
  return undefined;
};


/**
 * @param {ol.Coordinate} coordinate Coordinate.
 * @param {olx.FrameState} frameState FrameState.
 * @param {function(this: U, ol.layer.Layer): boolean} layerFilter Layer filter
 *     function, only layers which are visible and for which this function
 *     returns `true` will be tested for features.  By default, all visible
 *     layers will be tested.
 * @param {U} thisArg Value to use as `this` when executing `layerFilter`.
 * @return {boolean} Is there a feature at the given coordinate?
 * @template U
 */
ol.renderer.Map.prototype.hasFeatureAtCoordinate = function(coordinate, frameState, layerFilter, thisArg) {
  var hasFeature = this.forEachFeatureAtCoordinate(
      coordinate, frameState, ol.functions.TRUE, this, layerFilter, thisArg);

  return hasFeature !== undefined;
};


/**
 * @param {ol.layer.Layer} layer Layer.
 * @protected
 * @return {ol.renderer.Layer} Layer renderer.
 */
ol.renderer.Map.prototype.getLayerRenderer = function(layer) {
  var layerKey = ol.getUid(layer).toString();
  if (layerKey in this.layerRenderers_) {
    return this.layerRenderers_[layerKey];
  } else {
    var layerRenderer = this.createLayerRenderer(layer);
    this.layerRenderers_[layerKey] = layerRenderer;
    this.layerRendererListeners_[layerKey] = ol.events.listen(layerRenderer,
        ol.events.EventType.CHANGE, this.handleLayerRendererChange_, this);

    return layerRenderer;
  }
};


/**
 * @param {string} layerKey Layer key.
 * @protected
 * @return {ol.renderer.Layer} Layer renderer.
 */
ol.renderer.Map.prototype.getLayerRendererByKey = function(layerKey) {
  goog.DEBUG && console.assert(layerKey in this.layerRenderers_,
      'given layerKey (%s) exists in layerRenderers', layerKey);
  return this.layerRenderers_[layerKey];
};


/**
 * @protected
 * @return {Object.<string, ol.renderer.Layer>} Layer renderers.
 */
ol.renderer.Map.prototype.getLayerRenderers = function() {
  return this.layerRenderers_;
};


/**
 * @return {ol.Map} Map.
 */
ol.renderer.Map.prototype.getMap = function() {
  return this.map_;
};


/**
 * @abstract
 * @return {string} Type
 */
ol.renderer.Map.prototype.getType = function() {};


/**
 * Handle changes in a layer renderer.
 * @private
 */
ol.renderer.Map.prototype.handleLayerRendererChange_ = function() {
  this.map_.render();
};


/**
 * @param {string} layerKey Layer key.
 * @return {ol.renderer.Layer} Layer renderer.
 * @private
 */
ol.renderer.Map.prototype.removeLayerRendererByKey_ = function(layerKey) {
  goog.DEBUG && console.assert(layerKey in this.layerRenderers_,
      'given layerKey (%s) exists in layerRenderers', layerKey);
  var layerRenderer = this.layerRenderers_[layerKey];
  delete this.layerRenderers_[layerKey];

  goog.DEBUG && console.assert(layerKey in this.layerRendererListeners_,
      'given layerKey (%s) exists in layerRendererListeners', layerKey);
  ol.events.unlistenByKey(this.layerRendererListeners_[layerKey]);
  delete this.layerRendererListeners_[layerKey];

  return layerRenderer;
};


/**
 * Render.
 * @param {?olx.FrameState} frameState Frame state.
 */
ol.renderer.Map.prototype.renderFrame = ol.nullFunction;


/**
 * @param {ol.Map} map Map.
 * @param {olx.FrameState} frameState Frame state.
 * @private
 */
ol.renderer.Map.prototype.removeUnusedLayerRenderers_ = function(map, frameState) {
  var layerKey;
  for (layerKey in this.layerRenderers_) {
    if (!frameState || !(layerKey in frameState.layerStates)) {
      this.removeLayerRendererByKey_(layerKey).dispose();
    }
  }
};


/**
 * @param {olx.FrameState} frameState Frame state.
 * @protected
 */
ol.renderer.Map.prototype.scheduleExpireIconCache = function(frameState) {
  frameState.postRenderFunctions.push(
    /** @type {ol.PostRenderFunction} */ (ol.renderer.Map.expireIconCache_)
  );
};


/**
 * @param {!olx.FrameState} frameState Frame state.
 * @protected
 */
ol.renderer.Map.prototype.scheduleRemoveUnusedLayerRenderers = function(frameState) {
  var layerKey;
  for (layerKey in this.layerRenderers_) {
    if (!(layerKey in frameState.layerStates)) {
      frameState.postRenderFunctions.push(
        /** @type {ol.PostRenderFunction} */ (this.removeUnusedLayerRenderers_.bind(this))
      );
      return;
    }
  }
};


/**
 * @param {ol.LayerState} state1 First layer state.
 * @param {ol.LayerState} state2 Second layer state.
 * @return {number} The zIndex difference.
 */
ol.renderer.Map.sortByZIndex = function(state1, state2) {
  return state1.zIndex - state2.zIndex;
};

goog.provide('ol.Tile');

goog.require('ol');
goog.require('ol.events.EventTarget');
goog.require('ol.events.EventType');


/**
 * @classdesc
 * Base class for tiles.
 *
 * @constructor
 * @extends {ol.events.EventTarget}
 * @param {ol.TileCoord} tileCoord Tile coordinate.
 * @param {ol.Tile.State} state State.
 */
ol.Tile = function(tileCoord, state) {

  ol.events.EventTarget.call(this);

  /**
   * @type {ol.TileCoord}
   */
  this.tileCoord = tileCoord;

  /**
   * @protected
   * @type {ol.Tile.State}
   */
  this.state = state;

  /**
   * An "interim" tile for this tile. The interim tile may be used while this
   * one is loading, for "smooth" transitions when changing params/dimensions
   * on the source.
   * @type {ol.Tile}
   */
  this.interimTile = null;

  /**
   * A key assigned to the tile. This is used by the tile source to determine
   * if this tile can effectively be used, or if a new tile should be created
   * and this one be used as an interim tile for this new tile.
   * @type {string}
   */
  this.key = '';

};
ol.inherits(ol.Tile, ol.events.EventTarget);


/**
 * @protected
 */
ol.Tile.prototype.changed = function() {
  this.dispatchEvent(ol.events.EventType.CHANGE);
};


/**
 * Get the HTML image element for this tile (may be a Canvas, Image, or Video).
 * @abstract
 * @param {Object=} opt_context Object.
 * @return {HTMLCanvasElement|HTMLImageElement|HTMLVideoElement} Image.
 */
ol.Tile.prototype.getImage = function(opt_context) {};


/**
 * @return {string} Key.
 */
ol.Tile.prototype.getKey = function() {
  return this.key + '/' + this.tileCoord;
};


/**
 * Get the tile coordinate for this tile.
 * @return {ol.TileCoord} The tile coordinate.
 * @api
 */
ol.Tile.prototype.getTileCoord = function() {
  return this.tileCoord;
};


/**
 * @return {ol.Tile.State} State.
 */
ol.Tile.prototype.getState = function() {
  return this.state;
};


/**
 * Load the image or retry if loading previously failed.
 * Loading is taken care of by the tile queue, and calling this method is
 * only needed for preloading or for reloading in case of an error.
 * @abstract
 * @api
 */
ol.Tile.prototype.load = function() {};


/**
 * @enum {number}
 */
ol.Tile.State = {
  IDLE: 0,
  LOADING: 1,
  LOADED: 2,
  ERROR: 3,
  EMPTY: 4,
  ABORT: 5
};

goog.provide('ol.structs.PriorityQueue');

goog.require('ol.asserts');
goog.require('ol.obj');


/**
 * Priority queue.
 *
 * The implementation is inspired from the Closure Library's Heap class and
 * Python's heapq module.
 *
 * @see http://closure-library.googlecode.com/svn/docs/closure_goog_structs_heap.js.source.html
 * @see http://hg.python.org/cpython/file/2.7/Lib/heapq.py
 *
 * @constructor
 * @param {function(T): number} priorityFunction Priority function.
 * @param {function(T): string} keyFunction Key function.
 * @struct
 * @template T
 */
ol.structs.PriorityQueue = function(priorityFunction, keyFunction) {

  /**
   * @type {function(T): number}
   * @private
   */
  this.priorityFunction_ = priorityFunction;

  /**
   * @type {function(T): string}
   * @private
   */
  this.keyFunction_ = keyFunction;

  /**
   * @type {Array.<T>}
   * @private
   */
  this.elements_ = [];

  /**
   * @type {Array.<number>}
   * @private
   */
  this.priorities_ = [];

  /**
   * @type {Object.<string, boolean>}
   * @private
   */
  this.queuedElements_ = {};

};


/**
 * @const
 * @type {number}
 */
ol.structs.PriorityQueue.DROP = Infinity;


if (goog.DEBUG) {
  /**
   * FIXME empty description for jsdoc
   */
  ol.structs.PriorityQueue.prototype.assertValid = function() {
    var elements = this.elements_;
    var priorities = this.priorities_;
    var n = elements.length;
    console.assert(priorities.length == n);
    var i, priority;
    for (i = 0; i < (n >> 1) - 1; ++i) {
      priority = priorities[i];
      console.assert(priority <= priorities[this.getLeftChildIndex_(i)],
          'priority smaller than or equal to priority of left child (%s <= %s)',
          priority, priorities[this.getLeftChildIndex_(i)]);
      console.assert(priority <= priorities[this.getRightChildIndex_(i)],
          'priority smaller than or equal to priority of right child (%s <= %s)',
          priority, priorities[this.getRightChildIndex_(i)]);
    }
  };
}


/**
 * FIXME empty description for jsdoc
 */
ol.structs.PriorityQueue.prototype.clear = function() {
  this.elements_.length = 0;
  this.priorities_.length = 0;
  ol.obj.clear(this.queuedElements_);
};


/**
 * Remove and return the highest-priority element. O(log N).
 * @return {T} Element.
 */
ol.structs.PriorityQueue.prototype.dequeue = function() {
  var elements = this.elements_;
  goog.DEBUG && console.assert(elements.length > 0,
      'must have elements in order to be able to dequeue');
  var priorities = this.priorities_;
  var element = elements[0];
  if (elements.length == 1) {
    elements.length = 0;
    priorities.length = 0;
  } else {
    elements[0] = elements.pop();
    priorities[0] = priorities.pop();
    this.siftUp_(0);
  }
  var elementKey = this.keyFunction_(element);
  goog.DEBUG && console.assert(elementKey in this.queuedElements_,
      'key %s is not listed as queued', elementKey);
  delete this.queuedElements_[elementKey];
  return element;
};


/**
 * Enqueue an element. O(log N).
 * @param {T} element Element.
 * @return {boolean} The element was added to the queue.
 */
ol.structs.PriorityQueue.prototype.enqueue = function(element) {
  ol.asserts.assert(!(this.keyFunction_(element) in this.queuedElements_),
      31); // Tried to enqueue an `element` that was already added to the queue
  var priority = this.priorityFunction_(element);
  if (priority != ol.structs.PriorityQueue.DROP) {
    this.elements_.push(element);
    this.priorities_.push(priority);
    this.queuedElements_[this.keyFunction_(element)] = true;
    this.siftDown_(0, this.elements_.length - 1);
    return true;
  }
  return false;
};


/**
 * @return {number} Count.
 */
ol.structs.PriorityQueue.prototype.getCount = function() {
  return this.elements_.length;
};


/**
 * Gets the index of the left child of the node at the given index.
 * @param {number} index The index of the node to get the left child for.
 * @return {number} The index of the left child.
 * @private
 */
ol.structs.PriorityQueue.prototype.getLeftChildIndex_ = function(index) {
  return index * 2 + 1;
};


/**
 * Gets the index of the right child of the node at the given index.
 * @param {number} index The index of the node to get the right child for.
 * @return {number} The index of the right child.
 * @private
 */
ol.structs.PriorityQueue.prototype.getRightChildIndex_ = function(index) {
  return index * 2 + 2;
};


/**
 * Gets the index of the parent of the node at the given index.
 * @param {number} index The index of the node to get the parent for.
 * @return {number} The index of the parent.
 * @private
 */
ol.structs.PriorityQueue.prototype.getParentIndex_ = function(index) {
  return (index - 1) >> 1;
};


/**
 * Make this a heap. O(N).
 * @private
 */
ol.structs.PriorityQueue.prototype.heapify_ = function() {
  var i;
  for (i = (this.elements_.length >> 1) - 1; i >= 0; i--) {
    this.siftUp_(i);
  }
};


/**
 * @return {boolean} Is empty.
 */
ol.structs.PriorityQueue.prototype.isEmpty = function() {
  return this.elements_.length === 0;
};


/**
 * @param {string} key Key.
 * @return {boolean} Is key queued.
 */
ol.structs.PriorityQueue.prototype.isKeyQueued = function(key) {
  return key in this.queuedElements_;
};


/**
 * @param {T} element Element.
 * @return {boolean} Is queued.
 */
ol.structs.PriorityQueue.prototype.isQueued = function(element) {
  return this.isKeyQueued(this.keyFunction_(element));
};


/**
 * @param {number} index The index of the node to move down.
 * @private
 */
ol.structs.PriorityQueue.prototype.siftUp_ = function(index) {
  var elements = this.elements_;
  var priorities = this.priorities_;
  var count = elements.length;
  var element = elements[index];
  var priority = priorities[index];
  var startIndex = index;

  while (index < (count >> 1)) {
    var lIndex = this.getLeftChildIndex_(index);
    var rIndex = this.getRightChildIndex_(index);

    var smallerChildIndex = rIndex < count &&
        priorities[rIndex] < priorities[lIndex] ?
        rIndex : lIndex;

    elements[index] = elements[smallerChildIndex];
    priorities[index] = priorities[smallerChildIndex];
    index = smallerChildIndex;
  }

  elements[index] = element;
  priorities[index] = priority;
  this.siftDown_(startIndex, index);
};


/**
 * @param {number} startIndex The index of the root.
 * @param {number} index The index of the node to move up.
 * @private
 */
ol.structs.PriorityQueue.prototype.siftDown_ = function(startIndex, index) {
  var elements = this.elements_;
  var priorities = this.priorities_;
  var element = elements[index];
  var priority = priorities[index];

  while (index > startIndex) {
    var parentIndex = this.getParentIndex_(index);
    if (priorities[parentIndex] > priority) {
      elements[index] = elements[parentIndex];
      priorities[index] = priorities[parentIndex];
      index = parentIndex;
    } else {
      break;
    }
  }
  elements[index] = element;
  priorities[index] = priority;
};


/**
 * FIXME empty description for jsdoc
 */
ol.structs.PriorityQueue.prototype.reprioritize = function() {
  var priorityFunction = this.priorityFunction_;
  var elements = this.elements_;
  var priorities = this.priorities_;
  var index = 0;
  var n = elements.length;
  var element, i, priority;
  for (i = 0; i < n; ++i) {
    element = elements[i];
    priority = priorityFunction(element);
    if (priority == ol.structs.PriorityQueue.DROP) {
      delete this.queuedElements_[this.keyFunction_(element)];
    } else {
      priorities[index] = priority;
      elements[index++] = element;
    }
  }
  elements.length = index;
  priorities.length = index;
  this.heapify_();
};

goog.provide('ol.TileQueue');

goog.require('ol');
goog.require('ol.Tile');
goog.require('ol.events');
goog.require('ol.events.EventType');
goog.require('ol.structs.PriorityQueue');


/**
 * @constructor
 * @extends {ol.structs.PriorityQueue.<Array>}
 * @param {ol.TilePriorityFunction} tilePriorityFunction
 *     Tile priority function.
 * @param {function(): ?} tileChangeCallback
 *     Function called on each tile change event.
 * @struct
 */
ol.TileQueue = function(tilePriorityFunction, tileChangeCallback) {

  ol.structs.PriorityQueue.call(
      this,
      /**
       * @param {Array} element Element.
       * @return {number} Priority.
       */
      function(element) {
        return tilePriorityFunction.apply(null, element);
      },
      /**
       * @param {Array} element Element.
       * @return {string} Key.
       */
      function(element) {
        return /** @type {ol.Tile} */ (element[0]).getKey();
      });

  /**
   * @private
   * @type {function(): ?}
   */
  this.tileChangeCallback_ = tileChangeCallback;

  /**
   * @private
   * @type {number}
   */
  this.tilesLoading_ = 0;

  /**
   * @private
   * @type {!Object.<string,boolean>}
   */
  this.tilesLoadingKeys_ = {};

};
ol.inherits(ol.TileQueue, ol.structs.PriorityQueue);


/**
 * @inheritDoc
 */
ol.TileQueue.prototype.enqueue = function(element) {
  var added = ol.structs.PriorityQueue.prototype.enqueue.call(this, element);
  if (added) {
    var tile = element[0];
    ol.events.listen(tile, ol.events.EventType.CHANGE,
        this.handleTileChange, this);
  }
  return added;
};


/**
 * @return {number} Number of tiles loading.
 */
ol.TileQueue.prototype.getTilesLoading = function() {
  return this.tilesLoading_;
};


/**
 * @param {ol.events.Event} event Event.
 * @protected
 */
ol.TileQueue.prototype.handleTileChange = function(event) {
  var tile = /** @type {ol.Tile} */ (event.target);
  var state = tile.getState();
  if (state === ol.Tile.State.LOADED || state === ol.Tile.State.ERROR ||
      state === ol.Tile.State.EMPTY || state === ol.Tile.State.ABORT) {
    ol.events.unlisten(tile, ol.events.EventType.CHANGE,
        this.handleTileChange, this);
    var tileKey = tile.getKey();
    if (tileKey in this.tilesLoadingKeys_) {
      delete this.tilesLoadingKeys_[tileKey];
      --this.tilesLoading_;
    }
    this.tileChangeCallback_();
  }
  goog.DEBUG && console.assert(Object.keys(this.tilesLoadingKeys_).length === this.tilesLoading_);
};


/**
 * @param {number} maxTotalLoading Maximum number tiles to load simultaneously.
 * @param {number} maxNewLoads Maximum number of new tiles to load.
 */
ol.TileQueue.prototype.loadMoreTiles = function(maxTotalLoading, maxNewLoads) {
  var newLoads = 0;
  var tile, tileKey;
  while (this.tilesLoading_ < maxTotalLoading && newLoads < maxNewLoads &&
         this.getCount() > 0) {
    tile = /** @type {ol.Tile} */ (this.dequeue()[0]);
    tileKey = tile.getKey();
    if (tile.getState() === ol.Tile.State.IDLE && !(tileKey in this.tilesLoadingKeys_)) {
      this.tilesLoadingKeys_[tileKey] = true;
      ++this.tilesLoading_;
      ++newLoads;
      tile.load();
    }
    goog.DEBUG && console.assert(Object.keys(this.tilesLoadingKeys_).length === this.tilesLoading_);
  }
};

goog.provide('ol.Kinetic');

goog.require('ol.animation');


/**
 * @classdesc
 * Implementation of inertial deceleration for map movement.
 *
 * @constructor
 * @param {number} decay Rate of decay (must be negative).
 * @param {number} minVelocity Minimum velocity (pixels/millisecond).
 * @param {number} delay Delay to consider to calculate the kinetic
 *     initial values (milliseconds).
 * @struct
 * @api
 */
ol.Kinetic = function(decay, minVelocity, delay) {

  /**
   * @private
   * @type {number}
   */
  this.decay_ = decay;

  /**
   * @private
   * @type {number}
   */
  this.minVelocity_ = minVelocity;

  /**
   * @private
   * @type {number}
   */
  this.delay_ = delay;

  /**
   * @private
   * @type {Array.<number>}
   */
  this.points_ = [];

  /**
   * @private
   * @type {number}
   */
  this.angle_ = 0;

  /**
   * @private
   * @type {number}
   */
  this.initialVelocity_ = 0;
};


/**
 * FIXME empty description for jsdoc
 */
ol.Kinetic.prototype.begin = function() {
  this.points_.length = 0;
  this.angle_ = 0;
  this.initialVelocity_ = 0;
};


/**
 * @param {number} x X.
 * @param {number} y Y.
 */
ol.Kinetic.prototype.update = function(x, y) {
  this.points_.push(x, y, Date.now());
};


/**
 * @return {boolean} Whether we should do kinetic animation.
 */
ol.Kinetic.prototype.end = function() {
  if (this.points_.length < 6) {
    // at least 2 points are required (i.e. there must be at least 6 elements
    // in the array)
    return false;
  }
  var delay = Date.now() - this.delay_;
  var lastIndex = this.points_.length - 3;
  if (this.points_[lastIndex + 2] < delay) {
    // the last tracked point is too old, which means that the user stopped
    // panning before releasing the map
    return false;
  }

  // get the first point which still falls into the delay time
  var firstIndex = lastIndex - 3;
  while (firstIndex > 0 && this.points_[firstIndex + 2] > delay) {
    firstIndex -= 3;
  }
  var duration = this.points_[lastIndex + 2] - this.points_[firstIndex + 2];
  var dx = this.points_[lastIndex] - this.points_[firstIndex];
  var dy = this.points_[lastIndex + 1] - this.points_[firstIndex + 1];
  this.angle_ = Math.atan2(dy, dx);
  this.initialVelocity_ = Math.sqrt(dx * dx + dy * dy) / duration;
  return this.initialVelocity_ > this.minVelocity_;
};


/**
 * @param {ol.Coordinate} source Source coordinate for the animation.
 * @return {ol.PreRenderFunction} Pre-render function for kinetic animation.
 */
ol.Kinetic.prototype.pan = function(source) {
  var decay = this.decay_;
  var initialVelocity = this.initialVelocity_;
  var velocity = this.minVelocity_ - initialVelocity;
  var duration = this.getDuration_();
  var easingFunction = (
      /**
       * @param {number} t T.
       * @return {number} Easing.
       */
      function(t) {
        return initialVelocity * (Math.exp((decay * t) * duration) - 1) /
            velocity;
      });
  return ol.animation.pan({
    source: source,
    duration: duration,
    easing: easingFunction
  });
};


/**
 * @private
 * @return {number} Duration of animation (milliseconds).
 */
ol.Kinetic.prototype.getDuration_ = function() {
  return Math.log(this.minVelocity_ / this.initialVelocity_) / this.decay_;
};


/**
 * @return {number} Total distance travelled (pixels).
 */
ol.Kinetic.prototype.getDistance = function() {
  return (this.minVelocity_ - this.initialVelocity_) / this.decay_;
};


/**
 * @return {number} Angle of the kinetic panning animation (radians).
 */
ol.Kinetic.prototype.getAngle = function() {
  return this.angle_;
};

// FIXME factor out key precondition (shift et. al)

goog.provide('ol.interaction.Interaction');
goog.provide('ol.interaction.InteractionProperty');

goog.require('ol');
goog.require('ol.Object');
goog.require('ol.animation');
goog.require('ol.easing');


/**
 * @enum {string}
 */
ol.interaction.InteractionProperty = {
  ACTIVE: 'active'
};


/**
 * @classdesc
 * Abstract base class; normally only used for creating subclasses and not
 * instantiated in apps.
 * User actions that change the state of the map. Some are similar to controls,
 * but are not associated with a DOM element.
 * For example, {@link ol.interaction.KeyboardZoom} is functionally the same as
 * {@link ol.control.Zoom}, but triggered by a keyboard event not a button
 * element event.
 * Although interactions do not have a DOM element, some of them do render
 * vectors and so are visible on the screen.
 *
 * @constructor
 * @param {olx.interaction.InteractionOptions} options Options.
 * @extends {ol.Object}
 * @api
 */
ol.interaction.Interaction = function(options) {

  ol.Object.call(this);

  /**
   * @private
   * @type {ol.Map}
   */
  this.map_ = null;

  this.setActive(true);

  /**
   * @type {function(ol.MapBrowserEvent):boolean}
   */
  this.handleEvent = options.handleEvent;

};
ol.inherits(ol.interaction.Interaction, ol.Object);


/**
 * Return whether the interaction is currently active.
 * @return {boolean} `true` if the interaction is active, `false` otherwise.
 * @observable
 * @api
 */
ol.interaction.Interaction.prototype.getActive = function() {
  return /** @type {boolean} */ (
      this.get(ol.interaction.InteractionProperty.ACTIVE));
};


/**
 * Get the map associated with this interaction.
 * @return {ol.Map} Map.
 * @api
 */
ol.interaction.Interaction.prototype.getMap = function() {
  return this.map_;
};


/**
 * Activate or deactivate the interaction.
 * @param {boolean} active Active.
 * @observable
 * @api
 */
ol.interaction.Interaction.prototype.setActive = function(active) {
  this.set(ol.interaction.InteractionProperty.ACTIVE, active);
};


/**
 * Remove the interaction from its current map and attach it to the new map.
 * Subclasses may set up event handlers to get notified about changes to
 * the map here.
 * @param {ol.Map} map Map.
 */
ol.interaction.Interaction.prototype.setMap = function(map) {
  this.map_ = map;
};


/**
 * @param {ol.Map} map Map.
 * @param {ol.View} view View.
 * @param {ol.Coordinate} delta Delta.
 * @param {number=} opt_duration Duration.
 */
ol.interaction.Interaction.pan = function(map, view, delta, opt_duration) {
  var currentCenter = view.getCenter();
  if (currentCenter) {
    if (opt_duration && opt_duration > 0) {
      map.beforeRender(ol.animation.pan({
        source: currentCenter,
        duration: opt_duration,
        easing: ol.easing.linear
      }));
    }
    var center = view.constrainCenter(
        [currentCenter[0] + delta[0], currentCenter[1] + delta[1]]);
    view.setCenter(center);
  }
};


/**
 * @param {ol.Map} map Map.
 * @param {ol.View} view View.
 * @param {number|undefined} rotation Rotation.
 * @param {ol.Coordinate=} opt_anchor Anchor coordinate.
 * @param {number=} opt_duration Duration.
 */
ol.interaction.Interaction.rotate = function(map, view, rotation, opt_anchor, opt_duration) {
  rotation = view.constrainRotation(rotation, 0);
  ol.interaction.Interaction.rotateWithoutConstraints(
      map, view, rotation, opt_anchor, opt_duration);
};


/**
 * @param {ol.Map} map Map.
 * @param {ol.View} view View.
 * @param {number|undefined} rotation Rotation.
 * @param {ol.Coordinate=} opt_anchor Anchor coordinate.
 * @param {number=} opt_duration Duration.
 */
ol.interaction.Interaction.rotateWithoutConstraints = function(map, view, rotation, opt_anchor, opt_duration) {
  if (rotation !== undefined) {
    var currentRotation = view.getRotation();
    var currentCenter = view.getCenter();
    if (currentRotation !== undefined && currentCenter &&
        opt_duration && opt_duration > 0) {
      map.beforeRender(ol.animation.rotate({
        rotation: currentRotation,
        duration: opt_duration,
        easing: ol.easing.easeOut
      }));
      if (opt_anchor) {
        map.beforeRender(ol.animation.pan({
          source: currentCenter,
          duration: opt_duration,
          easing: ol.easing.easeOut
        }));
      }
    }
    view.rotate(rotation, opt_anchor);
  }
};


/**
 * @param {ol.Map} map Map.
 * @param {ol.View} view View.
 * @param {number|undefined} resolution Resolution to go to.
 * @param {ol.Coordinate=} opt_anchor Anchor coordinate.
 * @param {number=} opt_duration Duration.
 * @param {number=} opt_direction Zooming direction; > 0 indicates
 *     zooming out, in which case the constraints system will select
 *     the largest nearest resolution; < 0 indicates zooming in, in
 *     which case the constraints system will select the smallest
 *     nearest resolution; == 0 indicates that the zooming direction
 *     is unknown/not relevant, in which case the constraints system
 *     will select the nearest resolution. If not defined 0 is
 *     assumed.
 */
ol.interaction.Interaction.zoom = function(map, view, resolution, opt_anchor, opt_duration, opt_direction) {
  resolution = view.constrainResolution(resolution, 0, opt_direction);
  ol.interaction.Interaction.zoomWithoutConstraints(
      map, view, resolution, opt_anchor, opt_duration);
};


/**
 * @param {ol.Map} map Map.
 * @param {ol.View} view View.
 * @param {number} delta Delta from previous zoom level.
 * @param {ol.Coordinate=} opt_anchor Anchor coordinate.
 * @param {number=} opt_duration Duration.
 */
ol.interaction.Interaction.zoomByDelta = function(map, view, delta, opt_anchor, opt_duration) {
  var currentResolution = view.getResolution();
  var resolution = view.constrainResolution(currentResolution, delta, 0);
  ol.interaction.Interaction.zoomWithoutConstraints(
      map, view, resolution, opt_anchor, opt_duration);
};


/**
 * @param {ol.Map} map Map.
 * @param {ol.View} view View.
 * @param {number|undefined} resolution Resolution to go to.
 * @param {ol.Coordinate=} opt_anchor Anchor coordinate.
 * @param {number=} opt_duration Duration.
 */
ol.interaction.Interaction.zoomWithoutConstraints = function(map, view, resolution, opt_anchor, opt_duration) {
  if (resolution) {
    var currentResolution = view.getResolution();
    var currentCenter = view.getCenter();
    if (currentResolution !== undefined && currentCenter &&
        resolution !== currentResolution &&
        opt_duration && opt_duration > 0) {
      map.beforeRender(ol.animation.zoom({
        resolution: currentResolution,
        duration: opt_duration,
        easing: ol.easing.easeOut
      }));
      if (opt_anchor) {
        map.beforeRender(ol.animation.pan({
          source: currentCenter,
          duration: opt_duration,
          easing: ol.easing.easeOut
        }));
      }
    }
    if (opt_anchor) {
      var center = view.calculateCenterZoom(resolution, opt_anchor);
      view.setCenter(center);
    }
    view.setResolution(resolution);
  }
};

goog.provide('ol.interaction.DoubleClickZoom');

goog.require('ol');
goog.require('ol.MapBrowserEvent.EventType');
goog.require('ol.interaction.Interaction');


/**
 * @classdesc
 * Allows the user to zoom by double-clicking on the map.
 *
 * @constructor
 * @extends {ol.interaction.Interaction}
 * @param {olx.interaction.DoubleClickZoomOptions=} opt_options Options.
 * @api stable
 */
ol.interaction.DoubleClickZoom = function(opt_options) {

  var options = opt_options ? opt_options : {};

  /**
   * @private
   * @type {number}
   */
  this.delta_ = options.delta ? options.delta : 1;

  ol.interaction.Interaction.call(this, {
    handleEvent: ol.interaction.DoubleClickZoom.handleEvent
  });

  /**
   * @private
   * @type {number}
   */
  this.duration_ = options.duration !== undefined ? options.duration : 250;

};
ol.inherits(ol.interaction.DoubleClickZoom, ol.interaction.Interaction);


/**
 * Handles the {@link ol.MapBrowserEvent map browser event} (if it was a
 * doubleclick) and eventually zooms the map.
 * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
 * @return {boolean} `false` to stop event propagation.
 * @this {ol.interaction.DoubleClickZoom}
 * @api
 */
ol.interaction.DoubleClickZoom.handleEvent = function(mapBrowserEvent) {
  var stopEvent = false;
  var browserEvent = mapBrowserEvent.originalEvent;
  if (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.DBLCLICK) {
    var map = mapBrowserEvent.map;
    var anchor = mapBrowserEvent.coordinate;
    var delta = browserEvent.shiftKey ? -this.delta_ : this.delta_;
    var view = map.getView();
    ol.interaction.Interaction.zoomByDelta(
        map, view, delta, anchor, this.duration_);
    mapBrowserEvent.preventDefault();
    stopEvent = true;
  }
  return !stopEvent;
};

goog.provide('ol.events.condition');

goog.require('ol.asserts');
goog.require('ol.functions');
goog.require('ol.MapBrowserEvent.EventType');


/**
 * Return `true` if only the alt-key is pressed, `false` otherwise (e.g. when
 * additionally the shift-key is pressed).
 *
 * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
 * @return {boolean} True if only the alt key is pressed.
 * @api stable
 */
ol.events.condition.altKeyOnly = function(mapBrowserEvent) {
  var originalEvent = mapBrowserEvent.originalEvent;
  return (
      originalEvent.altKey &&
      !(originalEvent.metaKey || originalEvent.ctrlKey) &&
      !originalEvent.shiftKey);
};


/**
 * Return `true` if only the alt-key and shift-key is pressed, `false` otherwise
 * (e.g. when additionally the platform-modifier-key is pressed).
 *
 * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
 * @return {boolean} True if only the alt and shift keys are pressed.
 * @api stable
 */
ol.events.condition.altShiftKeysOnly = function(mapBrowserEvent) {
  var originalEvent = mapBrowserEvent.originalEvent;
  return (
      originalEvent.altKey &&
      !(originalEvent.metaKey || originalEvent.ctrlKey) &&
      originalEvent.shiftKey);
};


/**
 * Return always true.
 *
 * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
 * @return {boolean} True.
 * @function
 * @api stable
 */
ol.events.condition.always = ol.functions.TRUE;


/**
 * Return `true` if the event is a `click` event, `false` otherwise.
 *
 * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
 * @return {boolean} True if the event is a map `click` event.
 * @api stable
 */
ol.events.condition.click = function(mapBrowserEvent) {
  return mapBrowserEvent.type == ol.MapBrowserEvent.EventType.CLICK;
};


/**
 * Return `true` if the event has an "action"-producing mouse button.
 *
 * By definition, this includes left-click on windows/linux, and left-click
 * without the ctrl key on Macs.
 *
 * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
 * @return {boolean} The result.
 */
ol.events.condition.mouseActionButton = function(mapBrowserEvent) {
  var originalEvent = mapBrowserEvent.originalEvent;
  return originalEvent.button == 0 &&
      !(goog.userAgent.WEBKIT && ol.has.MAC && originalEvent.ctrlKey);
};


/**
 * Return always false.
 *
 * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
 * @return {boolean} False.
 * @function
 * @api stable
 */
ol.events.condition.never = ol.functions.FALSE;


/**
 * Return `true` if the browser event is a `pointermove` event, `false`
 * otherwise.
 *
 * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
 * @return {boolean} True if the browser event is a `pointermove` event.
 * @api
 */
ol.events.condition.pointerMove = function(mapBrowserEvent) {
  return mapBrowserEvent.type == 'pointermove';
};


/**
 * Return `true` if the event is a map `singleclick` event, `false` otherwise.
 *
 * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
 * @return {boolean} True if the event is a map `singleclick` event.
 * @api stable
 */
ol.events.condition.singleClick = function(mapBrowserEvent) {
  return mapBrowserEvent.type == ol.MapBrowserEvent.EventType.SINGLECLICK;
};


/**
 * Return `true` if the event is a map `dblclick` event, `false` otherwise.
 *
 * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
 * @return {boolean} True if the event is a map `dblclick` event.
 * @api stable
 */
ol.events.condition.doubleClick = function(mapBrowserEvent) {
  return mapBrowserEvent.type == ol.MapBrowserEvent.EventType.DBLCLICK;
};


/**
 * Return `true` if no modifier key (alt-, shift- or platform-modifier-key) is
 * pressed.
 *
 * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
 * @return {boolean} True only if there no modifier keys are pressed.
 * @api stable
 */
ol.events.condition.noModifierKeys = function(mapBrowserEvent) {
  var originalEvent = mapBrowserEvent.originalEvent;
  return (
      !originalEvent.altKey &&
      !(originalEvent.metaKey || originalEvent.ctrlKey) &&
      !originalEvent.shiftKey);
};


/**
 * Return `true` if only the platform-modifier-key (the meta-key on Mac,
 * ctrl-key otherwise) is pressed, `false` otherwise (e.g. when additionally
 * the shift-key is pressed).
 *
 * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
 * @return {boolean} True if only the platform modifier key is pressed.
 * @api stable
 */
ol.events.condition.platformModifierKeyOnly = function(mapBrowserEvent) {
  var originalEvent = mapBrowserEvent.originalEvent;
  return (
      !originalEvent.altKey &&
      (ol.has.MAC ? originalEvent.metaKey : originalEvent.ctrlKey) &&
      !originalEvent.shiftKey);
};


/**
 * Return `true` if only the shift-key is pressed, `false` otherwise (e.g. when
 * additionally the alt-key is pressed).
 *
 * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
 * @return {boolean} True if only the shift key is pressed.
 * @api stable
 */
ol.events.condition.shiftKeyOnly = function(mapBrowserEvent) {
  var originalEvent = mapBrowserEvent.originalEvent;
  return (
      !originalEvent.altKey &&
      !(originalEvent.metaKey || originalEvent.ctrlKey) &&
      originalEvent.shiftKey);
};


/**
 * Return `true` if the target element is not editable, i.e. not a `<input>`-,
 * `<select>`- or `<textarea>`-element, `false` otherwise.
 *
 * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
 * @return {boolean} True only if the target element is not editable.
 * @api
 */
ol.events.condition.targetNotEditable = function(mapBrowserEvent) {
  var target = mapBrowserEvent.originalEvent.target;
  var tagName = target.tagName;
  return (
      tagName !== 'INPUT' &&
      tagName !== 'SELECT' &&
      tagName !== 'TEXTAREA');
};


/**
 * Return `true` if the event originates from a mouse device.
 *
 * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
 * @return {boolean} True if the event originates from a mouse device.
 * @api stable
 */
ol.events.condition.mouseOnly = function(mapBrowserEvent) {
  ol.asserts.assert(mapBrowserEvent.pointerEvent, 56); // mapBrowserEvent must originate from a pointer event
  // see http://www.w3.org/TR/pointerevents/#widl-PointerEvent-pointerType
  return /** @type {ol.MapBrowserEvent} */ (mapBrowserEvent).pointerEvent.pointerType == 'mouse';
};


/**
 * Return `true` if the event originates from a primary pointer in
 * contact with the surface or if the left mouse button is pressed.
 * @see http://www.w3.org/TR/pointerevents/#button-states
 *
 * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
 * @return {boolean} True if the event originates from a primary pointer.
 * @api
 */
ol.events.condition.primaryAction = function(mapBrowserEvent) {
  var pointerEvent = mapBrowserEvent.pointerEvent;
  return pointerEvent.isPrimary && pointerEvent.button === 0;
};

goog.provide('ol.interaction.Pointer');

goog.require('ol');
goog.require('ol.MapBrowserEvent.EventType');
goog.require('ol.MapBrowserPointerEvent');
goog.require('ol.interaction.Interaction');
goog.require('ol.obj');


/**
 * @classdesc
 * Base class that calls user-defined functions on `down`, `move` and `up`
 * events. This class also manages "drag sequences".
 *
 * When the `handleDownEvent` user function returns `true` a drag sequence is
 * started. During a drag sequence the `handleDragEvent` user function is
 * called on `move` events. The drag sequence ends when the `handleUpEvent`
 * user function is called and returns `false`.
 *
 * @constructor
 * @param {olx.interaction.PointerOptions=} opt_options Options.
 * @extends {ol.interaction.Interaction}
 * @api
 */
ol.interaction.Pointer = function(opt_options) {

  var options = opt_options ? opt_options : {};

  var handleEvent = options.handleEvent ?
      options.handleEvent : ol.interaction.Pointer.handleEvent;

  ol.interaction.Interaction.call(this, {
    handleEvent: handleEvent
  });

  /**
   * @type {function(ol.MapBrowserPointerEvent):boolean}
   * @private
   */
  this.handleDownEvent_ = options.handleDownEvent ?
      options.handleDownEvent : ol.interaction.Pointer.handleDownEvent;

  /**
   * @type {function(ol.MapBrowserPointerEvent)}
   * @private
   */
  this.handleDragEvent_ = options.handleDragEvent ?
      options.handleDragEvent : ol.interaction.Pointer.handleDragEvent;

  /**
   * @type {function(ol.MapBrowserPointerEvent)}
   * @private
   */
  this.handleMoveEvent_ = options.handleMoveEvent ?
      options.handleMoveEvent : ol.interaction.Pointer.handleMoveEvent;

  /**
   * @type {function(ol.MapBrowserPointerEvent):boolean}
   * @private
   */
  this.handleUpEvent_ = options.handleUpEvent ?
      options.handleUpEvent : ol.interaction.Pointer.handleUpEvent;

  /**
   * @type {boolean}
   * @protected
   */
  this.handlingDownUpSequence = false;

  /**
   * @type {Object.<number, ol.pointer.PointerEvent>}
   * @private
   */
  this.trackedPointers_ = {};

  /**
   * @type {Array.<ol.pointer.PointerEvent>}
   * @protected
   */
  this.targetPointers = [];

};
ol.inherits(ol.interaction.Pointer, ol.interaction.Interaction);


/**
 * @param {Array.<ol.pointer.PointerEvent>} pointerEvents List of events.
 * @return {ol.Pixel} Centroid pixel.
 */
ol.interaction.Pointer.centroid = function(pointerEvents) {
  var length = pointerEvents.length;
  var clientX = 0;
  var clientY = 0;
  for (var i = 0; i < length; i++) {
    clientX += pointerEvents[i].clientX;
    clientY += pointerEvents[i].clientY;
  }
  return [clientX / length, clientY / length];
};


/**
 * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
 * @return {boolean} Whether the event is a pointerdown, pointerdrag
 *     or pointerup event.
 * @private
 */
ol.interaction.Pointer.prototype.isPointerDraggingEvent_ = function(mapBrowserEvent) {
  var type = mapBrowserEvent.type;
  return (
      type === ol.MapBrowserEvent.EventType.POINTERDOWN ||
      type === ol.MapBrowserEvent.EventType.POINTERDRAG ||
      type === ol.MapBrowserEvent.EventType.POINTERUP);
};


/**
 * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
 * @private
 */
ol.interaction.Pointer.prototype.updateTrackedPointers_ = function(mapBrowserEvent) {
  if (this.isPointerDraggingEvent_(mapBrowserEvent)) {
    var event = mapBrowserEvent.pointerEvent;

    if (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.POINTERUP) {
      delete this.trackedPointers_[event.pointerId];
    } else if (mapBrowserEvent.type ==
        ol.MapBrowserEvent.EventType.POINTERDOWN) {
      this.trackedPointers_[event.pointerId] = event;
    } else if (event.pointerId in this.trackedPointers_) {
      // update only when there was a pointerdown event for this pointer
      this.trackedPointers_[event.pointerId] = event;
    }
    this.targetPointers = ol.obj.getValues(this.trackedPointers_);
  }
};


/**
 * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
 * @this {ol.interaction.Pointer}
 */
ol.interaction.Pointer.handleDragEvent = ol.nullFunction;


/**
 * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
 * @return {boolean} Capture dragging.
 * @this {ol.interaction.Pointer}
 */
ol.interaction.Pointer.handleUpEvent = ol.functions.FALSE;


/**
 * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
 * @return {boolean} Capture dragging.
 * @this {ol.interaction.Pointer}
 */
ol.interaction.Pointer.handleDownEvent = ol.functions.FALSE;


/**
 * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
 * @this {ol.interaction.Pointer}
 */
ol.interaction.Pointer.handleMoveEvent = ol.nullFunction;


/**
 * Handles the {@link ol.MapBrowserEvent map browser event} and may call into
 * other functions, if event sequences like e.g. 'drag' or 'down-up' etc. are
 * detected.
 * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
 * @return {boolean} `false` to stop event propagation.
 * @this {ol.interaction.Pointer}
 * @api
 */
ol.interaction.Pointer.handleEvent = function(mapBrowserEvent) {
  if (!(mapBrowserEvent instanceof ol.MapBrowserPointerEvent)) {
    return true;
  }

  var stopEvent = false;
  this.updateTrackedPointers_(mapBrowserEvent);
  if (this.handlingDownUpSequence) {
    if (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.POINTERDRAG) {
      this.handleDragEvent_(mapBrowserEvent);
    } else if (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.POINTERUP) {
      this.handlingDownUpSequence = this.handleUpEvent_(mapBrowserEvent);
    }
  }
  if (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.POINTERDOWN) {
    var handled = this.handleDownEvent_(mapBrowserEvent);
    this.handlingDownUpSequence = handled;
    stopEvent = this.shouldStopEvent(handled);
  } else if (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.POINTERMOVE) {
    this.handleMoveEvent_(mapBrowserEvent);
  }
  return !stopEvent;
};


/**
 * This method is used to determine if "down" events should be propagated to
 * other interactions or should be stopped.
 *
 * The method receives the return code of the "handleDownEvent" function.
 *
 * By default this function is the "identity" function. It's overidden in
 * child classes.
 *
 * @param {boolean} handled Was the event handled by the interaction?
 * @return {boolean} Should the event be stopped?
 * @protected
 */
ol.interaction.Pointer.prototype.shouldStopEvent = function(handled) {
  return handled;
};

goog.provide('ol.interaction.DragPan');

goog.require('ol');
goog.require('ol.View');
goog.require('ol.coordinate');
goog.require('ol.events.condition');
goog.require('ol.functions');
goog.require('ol.interaction.Pointer');


/**
 * @classdesc
 * Allows the user to pan the map by dragging the map.
 *
 * @constructor
 * @extends {ol.interaction.Pointer}
 * @param {olx.interaction.DragPanOptions=} opt_options Options.
 * @api stable
 */
ol.interaction.DragPan = function(opt_options) {

  ol.interaction.Pointer.call(this, {
    handleDownEvent: ol.interaction.DragPan.handleDownEvent_,
    handleDragEvent: ol.interaction.DragPan.handleDragEvent_,
    handleUpEvent: ol.interaction.DragPan.handleUpEvent_
  });

  var options = opt_options ? opt_options : {};

  /**
   * @private
   * @type {ol.Kinetic|undefined}
   */
  this.kinetic_ = options.kinetic;

  /**
   * @private
   * @type {?ol.PreRenderFunction}
   */
  this.kineticPreRenderFn_ = null;

  /**
   * @type {ol.Pixel}
   */
  this.lastCentroid = null;

  /**
   * @private
   * @type {ol.EventsConditionType}
   */
  this.condition_ = options.condition ?
      options.condition : ol.events.condition.noModifierKeys;

  /**
   * @private
   * @type {boolean}
   */
  this.noKinetic_ = false;

};
ol.inherits(ol.interaction.DragPan, ol.interaction.Pointer);


/**
 * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
 * @this {ol.interaction.DragPan}
 * @private
 */
ol.interaction.DragPan.handleDragEvent_ = function(mapBrowserEvent) {
  goog.DEBUG && console.assert(this.targetPointers.length >= 1,
      'the length of this.targetPointers should be more than 1');
  var centroid =
      ol.interaction.Pointer.centroid(this.targetPointers);
  if (this.kinetic_) {
    this.kinetic_.update(centroid[0], centroid[1]);
  }
  if (this.lastCentroid) {
    var deltaX = this.lastCentroid[0] - centroid[0];
    var deltaY = centroid[1] - this.lastCentroid[1];
    var map = mapBrowserEvent.map;
    var view = map.getView();
    var viewState = view.getState();
    var center = [deltaX, deltaY];
    ol.coordinate.scale(center, viewState.resolution);
    ol.coordinate.rotate(center, viewState.rotation);
    ol.coordinate.add(center, viewState.center);
    center = view.constrainCenter(center);
    view.setCenter(center);
  }
  this.lastCentroid = centroid;
};


/**
 * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
 * @return {boolean} Stop drag sequence?
 * @this {ol.interaction.DragPan}
 * @private
 */
ol.interaction.DragPan.handleUpEvent_ = function(mapBrowserEvent) {
  var map = mapBrowserEvent.map;
  var view = map.getView();
  if (this.targetPointers.length === 0) {
    if (!this.noKinetic_ && this.kinetic_ && this.kinetic_.end()) {
      var distance = this.kinetic_.getDistance();
      var angle = this.kinetic_.getAngle();
      var center = /** @type {!ol.Coordinate} */ (view.getCenter());
      this.kineticPreRenderFn_ = this.kinetic_.pan(center);
      map.beforeRender(this.kineticPreRenderFn_);
      var centerpx = map.getPixelFromCoordinate(center);
      var dest = map.getCoordinateFromPixel([
        centerpx[0] - distance * Math.cos(angle),
        centerpx[1] - distance * Math.sin(angle)
      ]);
      dest = view.constrainCenter(dest);
      view.setCenter(dest);
    } else {
      // the view is not updated, force a render
      map.render();
    }
    view.setHint(ol.View.Hint.INTERACTING, -1);
    return false;
  } else {
    this.lastCentroid = null;
    return true;
  }
};


/**
 * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
 * @return {boolean} Start drag sequence?
 * @this {ol.interaction.DragPan}
 * @private
 */
ol.interaction.DragPan.handleDownEvent_ = function(mapBrowserEvent) {
  if (this.targetPointers.length > 0 && this.condition_(mapBrowserEvent)) {
    var map = mapBrowserEvent.map;
    var view = map.getView();
    this.lastCentroid = null;
    if (!this.handlingDownUpSequence) {
      view.setHint(ol.View.Hint.INTERACTING, 1);
    }
    if (this.kineticPreRenderFn_ &&
        map.removePreRenderFunction(this.kineticPreRenderFn_)) {
      view.setCenter(mapBrowserEvent.frameState.viewState.center);
      this.kineticPreRenderFn_ = null;
    }
    if (this.kinetic_) {
      this.kinetic_.begin();
    }
    // No kinetic as soon as more than one pointer on the screen is
    // detected. This is to prevent nasty pans after pinch.
    this.noKinetic_ = this.targetPointers.length > 1;
    return true;
  } else {
    return false;
  }
};


/**
 * @inheritDoc
 */
ol.interaction.DragPan.prototype.shouldStopEvent = ol.functions.FALSE;

goog.provide('ol.interaction.DragRotate');

goog.require('ol');
goog.require('ol.View');
goog.require('ol.events.condition');
goog.require('ol.functions');
goog.require('ol.interaction.Interaction');
goog.require('ol.interaction.Pointer');


/**
 * @classdesc
 * Allows the user to rotate the map by clicking and dragging on the map,
 * normally combined with an {@link ol.events.condition} that limits
 * it to when the alt and shift keys are held down.
 *
 * This interaction is only supported for mouse devices.
 *
 * @constructor
 * @extends {ol.interaction.Pointer}
 * @param {olx.interaction.DragRotateOptions=} opt_options Options.
 * @api stable
 */
ol.interaction.DragRotate = function(opt_options) {

  var options = opt_options ? opt_options : {};

  ol.interaction.Pointer.call(this, {
    handleDownEvent: ol.interaction.DragRotate.handleDownEvent_,
    handleDragEvent: ol.interaction.DragRotate.handleDragEvent_,
    handleUpEvent: ol.interaction.DragRotate.handleUpEvent_
  });

  /**
   * @private
   * @type {ol.EventsConditionType}
   */
  this.condition_ = options.condition ?
      options.condition : ol.events.condition.altShiftKeysOnly;

  /**
   * @private
   * @type {number|undefined}
   */
  this.lastAngle_ = undefined;

  /**
   * @private
   * @type {number}
   */
  this.duration_ = options.duration !== undefined ? options.duration : 250;
};
ol.inherits(ol.interaction.DragRotate, ol.interaction.Pointer);


/**
 * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
 * @this {ol.interaction.DragRotate}
 * @private
 */
ol.interaction.DragRotate.handleDragEvent_ = function(mapBrowserEvent) {
  if (!ol.events.condition.mouseOnly(mapBrowserEvent)) {
    return;
  }

  var map = mapBrowserEvent.map;
  var size = map.getSize();
  var offset = mapBrowserEvent.pixel;
  var theta =
      Math.atan2(size[1] / 2 - offset[1], offset[0] - size[0] / 2);
  if (this.lastAngle_ !== undefined) {
    var delta = theta - this.lastAngle_;
    var view = map.getView();
    var rotation = view.getRotation();
    ol.interaction.Interaction.rotateWithoutConstraints(
        map, view, rotation - delta);
  }
  this.lastAngle_ = theta;
};


/**
 * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
 * @return {boolean} Stop drag sequence?
 * @this {ol.interaction.DragRotate}
 * @private
 */
ol.interaction.DragRotate.handleUpEvent_ = function(mapBrowserEvent) {
  if (!ol.events.condition.mouseOnly(mapBrowserEvent)) {
    return true;
  }

  var map = mapBrowserEvent.map;
  var view = map.getView();
  view.setHint(ol.View.Hint.INTERACTING, -1);
  var rotation = view.getRotation();
  ol.interaction.Interaction.rotate(map, view, rotation,
      undefined, this.duration_);
  return false;
};


/**
 * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
 * @return {boolean} Start drag sequence?
 * @this {ol.interaction.DragRotate}
 * @private
 */
ol.interaction.DragRotate.handleDownEvent_ = function(mapBrowserEvent) {
  if (!ol.events.condition.mouseOnly(mapBrowserEvent)) {
    return false;
  }

  if (ol.events.condition.mouseActionButton(mapBrowserEvent) &&
      this.condition_(mapBrowserEvent)) {
    var map = mapBrowserEvent.map;
    map.getView().setHint(ol.View.Hint.INTERACTING, 1);
    this.lastAngle_ = undefined;
    return true;
  } else {
    return false;
  }
};


/**
 * @inheritDoc
 */
ol.interaction.DragRotate.prototype.shouldStopEvent = ol.functions.FALSE;

// FIXME add rotation

goog.provide('ol.render.Box');

goog.require('ol');
goog.require('ol.Disposable');
goog.require('ol.geom.Polygon');


/**
 * @constructor
 * @extends {ol.Disposable}
 * @param {string} className CSS class name.
 */
ol.render.Box = function(className) {

  /**
   * @type {ol.geom.Polygon}
   * @private
   */
  this.geometry_ = null;

  /**
   * @type {HTMLDivElement}
   * @private
   */
  this.element_ = /** @type {HTMLDivElement} */ (document.createElement('div'));
  this.element_.style.position = 'absolute';
  this.element_.className = 'ol-box ' + className;

  /**
   * @private
   * @type {ol.Map}
   */
  this.map_ = null;

  /**
   * @private
   * @type {ol.Pixel}
   */
  this.startPixel_ = null;

  /**
   * @private
   * @type {ol.Pixel}
   */
  this.endPixel_ = null;

};
ol.inherits(ol.render.Box, ol.Disposable);


/**
 * @inheritDoc
 */
ol.render.Box.prototype.disposeInternal = function() {
  this.setMap(null);
};


/**
 * @private
 */
ol.render.Box.prototype.render_ = function() {
  var startPixel = this.startPixel_;
  var endPixel = this.endPixel_;
  var px = 'px';
  var style = this.element_.style;
  style.left = Math.min(startPixel[0], endPixel[0]) + px;
  style.top = Math.min(startPixel[1], endPixel[1]) + px;
  style.width = Math.abs(endPixel[0] - startPixel[0]) + px;
  style.height = Math.abs(endPixel[1] - startPixel[1]) + px;
};


/**
 * @param {ol.Map} map Map.
 */
ol.render.Box.prototype.setMap = function(map) {
  if (this.map_) {
    this.map_.getOverlayContainer().removeChild(this.element_);
    var style = this.element_.style;
    style.left = style.top = style.width = style.height = 'inherit';
  }
  this.map_ = map;
  if (this.map_) {
    this.map_.getOverlayContainer().appendChild(this.element_);
  }
};


/**
 * @param {ol.Pixel} startPixel Start pixel.
 * @param {ol.Pixel} endPixel End pixel.
 */
ol.render.Box.prototype.setPixels = function(startPixel, endPixel) {
  this.startPixel_ = startPixel;
  this.endPixel_ = endPixel;
  this.createOrUpdateGeometry();
  this.render_();
};


/**
 * Creates or updates the cached geometry.
 */
ol.render.Box.prototype.createOrUpdateGeometry = function() {
  var startPixel = this.startPixel_;
  var endPixel = this.endPixel_;
  var pixels = [
    startPixel,
    [startPixel[0], endPixel[1]],
    endPixel,
    [endPixel[0], startPixel[1]]
  ];
  var coordinates = pixels.map(this.map_.getCoordinateFromPixel, this.map_);
  // close the polygon
  coordinates[4] = coordinates[0].slice();
  if (!this.geometry_) {
    this.geometry_ = new ol.geom.Polygon([coordinates]);
  } else {
    this.geometry_.setCoordinates([coordinates]);
  }
};


/**
 * @return {ol.geom.Polygon} Geometry.
 */
ol.render.Box.prototype.getGeometry = function() {
  return this.geometry_;
};

// FIXME draw drag box
goog.provide('ol.interaction.DragBox');
goog.provide('ol.DragBoxEvent');

goog.require('ol.events.Event');
goog.require('ol');
goog.require('ol.events.condition');
goog.require('ol.interaction.Pointer');
goog.require('ol.render.Box');


/**
 * @const
 * @type {number}
 */
ol.DRAG_BOX_HYSTERESIS_PIXELS_SQUARED =
    ol.DRAG_BOX_HYSTERESIS_PIXELS *
    ol.DRAG_BOX_HYSTERESIS_PIXELS;


/**
 * @enum {string}
 */
ol.DragBoxEventType = {
  /**
   * Triggered upon drag box start.
   * @event ol.DragBoxEvent#boxstart
   * @api stable
   */
  BOXSTART: 'boxstart',

  /**
   * Triggered on drag when box is active.
   * @event ol.DragBoxEvent#boxdrag
   * @api
   */
  BOXDRAG: 'boxdrag',

  /**
   * Triggered upon drag box end.
   * @event ol.DragBoxEvent#boxend
   * @api stable
   */
  BOXEND: 'boxend'
};


/**
 * @classdesc
 * Events emitted by {@link ol.interaction.DragBox} instances are instances of
 * this type.
 *
 * @param {string} type The event type.
 * @param {ol.Coordinate} coordinate The event coordinate.
 * @param {ol.MapBrowserEvent} mapBrowserEvent Originating event.
 * @extends {ol.events.Event}
 * @constructor
 * @implements {oli.DragBoxEvent}
 */
ol.DragBoxEvent = function(type, coordinate, mapBrowserEvent) {
  ol.events.Event.call(this, type);

  /**
   * The coordinate of the drag event.
   * @const
   * @type {ol.Coordinate}
   * @api stable
   */
  this.coordinate = coordinate;

  /**
   * @const
   * @type {ol.MapBrowserEvent}
   * @api
   */
  this.mapBrowserEvent = mapBrowserEvent;

};
ol.inherits(ol.DragBoxEvent, ol.events.Event);


/**
 * @classdesc
 * Allows the user to draw a vector box by clicking and dragging on the map,
 * normally combined with an {@link ol.events.condition} that limits
 * it to when the shift or other key is held down. This is used, for example,
 * for zooming to a specific area of the map
 * (see {@link ol.interaction.DragZoom} and
 * {@link ol.interaction.DragRotateAndZoom}).
 *
 * This interaction is only supported for mouse devices.
 *
 * @constructor
 * @extends {ol.interaction.Pointer}
 * @fires ol.DragBoxEvent
 * @param {olx.interaction.DragBoxOptions=} opt_options Options.
 * @api stable
 */
ol.interaction.DragBox = function(opt_options) {

  ol.interaction.Pointer.call(this, {
    handleDownEvent: ol.interaction.DragBox.handleDownEvent_,
    handleDragEvent: ol.interaction.DragBox.handleDragEvent_,
    handleUpEvent: ol.interaction.DragBox.handleUpEvent_
  });

  var options = opt_options ? opt_options : {};

  /**
   * @type {ol.render.Box}
   * @private
   */
  this.box_ = new ol.render.Box(options.className || 'ol-dragbox');

  /**
   * @type {ol.Pixel}
   * @private
   */
  this.startPixel_ = null;

  /**
   * @private
   * @type {ol.EventsConditionType}
   */
  this.condition_ = options.condition ?
      options.condition : ol.events.condition.always;

  /**
   * @private
   * @type {ol.DragBoxEndConditionType}
   */
  this.boxEndCondition_ = options.boxEndCondition ?
      options.boxEndCondition : ol.interaction.DragBox.defaultBoxEndCondition;
};
ol.inherits(ol.interaction.DragBox, ol.interaction.Pointer);


/**
 * The default condition for determining whether the boxend event
 * should fire.
 * @param  {ol.MapBrowserEvent} mapBrowserEvent The originating MapBrowserEvent
 *  leading to the box end.
 * @param  {ol.Pixel} startPixel      The starting pixel of the box.
 * @param  {ol.Pixel} endPixel        The end pixel of the box.
 * @return {boolean} Whether or not the boxend condition should be fired.
 */
ol.interaction.DragBox.defaultBoxEndCondition = function(mapBrowserEvent,
    startPixel, endPixel) {
  var width = endPixel[0] - startPixel[0];
  var height = endPixel[1] - startPixel[1];
  return width * width + height * height >=
      ol.DRAG_BOX_HYSTERESIS_PIXELS_SQUARED;
};


/**
 * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
 * @this {ol.interaction.DragBox}
 * @private
 */
ol.interaction.DragBox.handleDragEvent_ = function(mapBrowserEvent) {
  if (!ol.events.condition.mouseOnly(mapBrowserEvent)) {
    return;
  }

  this.box_.setPixels(this.startPixel_, mapBrowserEvent.pixel);

  this.dispatchEvent(new ol.DragBoxEvent(ol.DragBoxEventType.BOXDRAG,
    mapBrowserEvent.coordinate, mapBrowserEvent));
};


/**
 * Returns geometry of last drawn box.
 * @return {ol.geom.Polygon} Geometry.
 * @api stable
 */
ol.interaction.DragBox.prototype.getGeometry = function() {
  return this.box_.getGeometry();
};


/**
 * To be overriden by child classes.
 * FIXME: use constructor option instead of relying on overridding.
 * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
 * @protected
 */
ol.interaction.DragBox.prototype.onBoxEnd = ol.nullFunction;


/**
 * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
 * @return {boolean} Stop drag sequence?
 * @this {ol.interaction.DragBox}
 * @private
 */
ol.interaction.DragBox.handleUpEvent_ = function(mapBrowserEvent) {
  if (!ol.events.condition.mouseOnly(mapBrowserEvent)) {
    return true;
  }

  this.box_.setMap(null);

  if (this.boxEndCondition_(mapBrowserEvent,
      this.startPixel_, mapBrowserEvent.pixel)) {
    this.onBoxEnd(mapBrowserEvent);
    this.dispatchEvent(new ol.DragBoxEvent(ol.DragBoxEventType.BOXEND,
        mapBrowserEvent.coordinate, mapBrowserEvent));
  }
  return false;
};


/**
 * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
 * @return {boolean} Start drag sequence?
 * @this {ol.interaction.DragBox}
 * @private
 */
ol.interaction.DragBox.handleDownEvent_ = function(mapBrowserEvent) {
  if (!ol.events.condition.mouseOnly(mapBrowserEvent)) {
    return false;
  }

  if (ol.events.condition.mouseActionButton(mapBrowserEvent) &&
      this.condition_(mapBrowserEvent)) {
    this.startPixel_ = mapBrowserEvent.pixel;
    this.box_.setMap(mapBrowserEvent.map);
    this.box_.setPixels(this.startPixel_, this.startPixel_);
    this.dispatchEvent(new ol.DragBoxEvent(ol.DragBoxEventType.BOXSTART,
        mapBrowserEvent.coordinate, mapBrowserEvent));
    return true;
  } else {
    return false;
  }
};

goog.provide('ol.interaction.DragZoom');

goog.require('ol');
goog.require('ol.animation');
goog.require('ol.easing');
goog.require('ol.events.condition');
goog.require('ol.extent');
goog.require('ol.interaction.DragBox');


/**
 * @classdesc
 * Allows the user to zoom the map by clicking and dragging on the map,
 * normally combined with an {@link ol.events.condition} that limits
 * it to when a key, shift by default, is held down.
 *
 * To change the style of the box, use CSS and the `.ol-dragzoom` selector, or
 * your custom one configured with `className`.
 *
 * @constructor
 * @extends {ol.interaction.DragBox}
 * @param {olx.interaction.DragZoomOptions=} opt_options Options.
 * @api stable
 */
ol.interaction.DragZoom = function(opt_options) {
  var options = opt_options ? opt_options : {};

  var condition = options.condition ?
      options.condition : ol.events.condition.shiftKeyOnly;

  /**
   * @private
   * @type {number}
   */
  this.duration_ = options.duration !== undefined ? options.duration : 200;

  /**
   * @private
   * @type {boolean}
   */
  this.out_ = options.out !== undefined ? options.out : false;

  ol.interaction.DragBox.call(this, {
    condition: condition,
    className: options.className || 'ol-dragzoom'
  });

};
ol.inherits(ol.interaction.DragZoom, ol.interaction.DragBox);


/**
 * @inheritDoc
 */
ol.interaction.DragZoom.prototype.onBoxEnd = function() {
  var map = this.getMap();

  var view = /** @type {!ol.View} */ (map.getView());

  var size = /** @type {!ol.Size} */ (map.getSize());

  var extent = this.getGeometry().getExtent();

  if (this.out_) {
    var mapExtent = view.calculateExtent(size);
    var boxPixelExtent = ol.extent.createOrUpdateFromCoordinates([
      map.getPixelFromCoordinate(ol.extent.getBottomLeft(extent)),
      map.getPixelFromCoordinate(ol.extent.getTopRight(extent))]);
    var factor = view.getResolutionForExtent(boxPixelExtent, size);

    ol.extent.scaleFromCenter(mapExtent, 1 / factor);
    extent = mapExtent;
  }

  var resolution = view.constrainResolution(
      view.getResolutionForExtent(extent, size));

  var currentResolution = /** @type {number} */ (view.getResolution());

  var currentCenter = /** @type {!ol.Coordinate} */ (view.getCenter());

  map.beforeRender(ol.animation.zoom({
    resolution: currentResolution,
    duration: this.duration_,
    easing: ol.easing.easeOut
  }));
  map.beforeRender(ol.animation.pan({
    source: currentCenter,
    duration: this.duration_,
    easing: ol.easing.easeOut
  }));

  view.setCenter(ol.extent.getCenter(extent));
  view.setResolution(resolution);
};

goog.provide('ol.events.KeyCode');

/**
 * @enum {number}
 * @const
 */
ol.events.KeyCode = {
  LEFT: 37,
  UP: 38,
  RIGHT: 39,
  DOWN: 40
};

goog.provide('ol.interaction.KeyboardPan');

goog.require('ol');
goog.require('ol.coordinate');
goog.require('ol.events.EventType');
goog.require('ol.events.KeyCode');
goog.require('ol.events.condition');
goog.require('ol.interaction.Interaction');


/**
 * @classdesc
 * Allows the user to pan the map using keyboard arrows.
 * Note that, although this interaction is by default included in maps,
 * the keys can only be used when browser focus is on the element to which
 * the keyboard events are attached. By default, this is the map div,
 * though you can change this with the `keyboardEventTarget` in
 * {@link ol.Map}. `document` never loses focus but, for any other element,
 * focus will have to be on, and returned to, this element if the keys are to
 * function.
 * See also {@link ol.interaction.KeyboardZoom}.
 *
 * @constructor
 * @extends {ol.interaction.Interaction}
 * @param {olx.interaction.KeyboardPanOptions=} opt_options Options.
 * @api stable
 */
ol.interaction.KeyboardPan = function(opt_options) {

  ol.interaction.Interaction.call(this, {
    handleEvent: ol.interaction.KeyboardPan.handleEvent
  });

  var options = opt_options || {};

  /**
   * @private
   * @param {ol.MapBrowserEvent} mapBrowserEvent Browser event.
   * @return {boolean} Combined condition result.
   */
  this.defaultCondition_ = function(mapBrowserEvent) {
    return ol.events.condition.noModifierKeys(mapBrowserEvent) &&
      ol.events.condition.targetNotEditable(mapBrowserEvent);
  };

  /**
   * @private
   * @type {ol.EventsConditionType}
   */
  this.condition_ = options.condition !== undefined ?
      options.condition : this.defaultCondition_;

  /**
   * @private
   * @type {number}
   */
  this.duration_ = options.duration !== undefined ? options.duration : 100;

  /**
   * @private
   * @type {number}
   */
  this.pixelDelta_ = options.pixelDelta !== undefined ?
      options.pixelDelta : 128;

};
ol.inherits(ol.interaction.KeyboardPan, ol.interaction.Interaction);

/**
 * Handles the {@link ol.MapBrowserEvent map browser event} if it was a
 * `KeyEvent`, and decides the direction to pan to (if an arrow key was
 * pressed).
 * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
 * @return {boolean} `false` to stop event propagation.
 * @this {ol.interaction.KeyboardPan}
 * @api
 */
ol.interaction.KeyboardPan.handleEvent = function(mapBrowserEvent) {
  var stopEvent = false;
  if (mapBrowserEvent.type == ol.events.EventType.KEYDOWN) {
    var keyEvent = mapBrowserEvent.originalEvent;
    var keyCode = keyEvent.keyCode;
    if (this.condition_(mapBrowserEvent) &&
        (keyCode == ol.events.KeyCode.DOWN ||
        keyCode == ol.events.KeyCode.LEFT ||
        keyCode == ol.events.KeyCode.RIGHT ||
        keyCode == ol.events.KeyCode.UP)) {
      var map = mapBrowserEvent.map;
      var view = map.getView();
      var mapUnitsDelta = view.getResolution() * this.pixelDelta_;
      var deltaX = 0, deltaY = 0;
      if (keyCode == ol.events.KeyCode.DOWN) {
        deltaY = -mapUnitsDelta;
      } else if (keyCode == ol.events.KeyCode.LEFT) {
        deltaX = -mapUnitsDelta;
      } else if (keyCode == ol.events.KeyCode.RIGHT) {
        deltaX = mapUnitsDelta;
      } else {
        deltaY = mapUnitsDelta;
      }
      var delta = [deltaX, deltaY];
      ol.coordinate.rotate(delta, view.getRotation());
      ol.interaction.Interaction.pan(map, view, delta, this.duration_);
      mapBrowserEvent.preventDefault();
      stopEvent = true;
    }
  }
  return !stopEvent;
};

goog.provide('ol.interaction.KeyboardZoom');

goog.require('ol');
goog.require('ol.events.EventType');
goog.require('ol.events.condition');
goog.require('ol.interaction.Interaction');


/**
 * @classdesc
 * Allows the user to zoom the map using keyboard + and -.
 * Note that, although this interaction is by default included in maps,
 * the keys can only be used when browser focus is on the element to which
 * the keyboard events are attached. By default, this is the map div,
 * though you can change this with the `keyboardEventTarget` in
 * {@link ol.Map}. `document` never loses focus but, for any other element,
 * focus will have to be on, and returned to, this element if the keys are to
 * function.
 * See also {@link ol.interaction.KeyboardPan}.
 *
 * @constructor
 * @param {olx.interaction.KeyboardZoomOptions=} opt_options Options.
 * @extends {ol.interaction.Interaction}
 * @api stable
 */
ol.interaction.KeyboardZoom = function(opt_options) {

  ol.interaction.Interaction.call(this, {
    handleEvent: ol.interaction.KeyboardZoom.handleEvent
  });

  var options = opt_options ? opt_options : {};

  /**
   * @private
   * @type {ol.EventsConditionType}
   */
  this.condition_ = options.condition ? options.condition :
          ol.events.condition.targetNotEditable;

  /**
   * @private
   * @type {number}
   */
  this.delta_ = options.delta ? options.delta : 1;

  /**
   * @private
   * @type {number}
   */
  this.duration_ = options.duration !== undefined ? options.duration : 100;

};
ol.inherits(ol.interaction.KeyboardZoom, ol.interaction.Interaction);


/**
 * Handles the {@link ol.MapBrowserEvent map browser event} if it was a
 * `KeyEvent`, and decides whether to zoom in or out (depending on whether the
 * key pressed was '+' or '-').
 * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
 * @return {boolean} `false` to stop event propagation.
 * @this {ol.interaction.KeyboardZoom}
 * @api
 */
ol.interaction.KeyboardZoom.handleEvent = function(mapBrowserEvent) {
  var stopEvent = false;
  if (mapBrowserEvent.type == ol.events.EventType.KEYDOWN ||
      mapBrowserEvent.type == ol.events.EventType.KEYPRESS) {
    var keyEvent = mapBrowserEvent.originalEvent;
    var charCode = keyEvent.charCode;
    if (this.condition_(mapBrowserEvent) &&
        (charCode == '+'.charCodeAt(0) || charCode == '-'.charCodeAt(0))) {
      var map = mapBrowserEvent.map;
      var delta = (charCode == '+'.charCodeAt(0)) ? this.delta_ : -this.delta_;
      var view = map.getView();
      ol.interaction.Interaction.zoomByDelta(
          map, view, delta, undefined, this.duration_);
      mapBrowserEvent.preventDefault();
      stopEvent = true;
    }
  }
  return !stopEvent;
};

goog.provide('ol.interaction.MouseWheelZoom');

goog.require('ol');
goog.require('ol.events.EventType');
goog.require('ol.interaction.Interaction');
goog.require('ol.math');


/**
 * @classdesc
 * Allows the user to zoom the map by scrolling the mouse wheel.
 *
 * @constructor
 * @extends {ol.interaction.Interaction}
 * @param {olx.interaction.MouseWheelZoomOptions=} opt_options Options.
 * @api stable
 */
ol.interaction.MouseWheelZoom = function(opt_options) {

  ol.interaction.Interaction.call(this, {
    handleEvent: ol.interaction.MouseWheelZoom.handleEvent
  });

  var options = opt_options || {};

  /**
   * @private
   * @type {number}
   */
  this.delta_ = 0;

  /**
   * @private
   * @type {number}
   */
  this.duration_ = options.duration !== undefined ? options.duration : 250;

  /**
   * @private
   * @type {boolean}
   */
  this.useAnchor_ = options.useAnchor !== undefined ? options.useAnchor : true;

  /**
   * @private
   * @type {?ol.Coordinate}
   */
  this.lastAnchor_ = null;

  /**
   * @private
   * @type {number|undefined}
   */
  this.startTime_ = undefined;

  /**
   * @private
   * @type {number|undefined}
   */
  this.timeoutId_ = undefined;

};
ol.inherits(ol.interaction.MouseWheelZoom, ol.interaction.Interaction);


/**
 * Handles the {@link ol.MapBrowserEvent map browser event} (if it was a
 * mousewheel-event) and eventually zooms the map.
 * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
 * @return {boolean} `false` to stop event propagation.
 * @this {ol.interaction.MouseWheelZoom}
 * @api
 */
ol.interaction.MouseWheelZoom.handleEvent = function(mapBrowserEvent) {
  var stopEvent = false;
  if (mapBrowserEvent.type == ol.events.EventType.WHEEL ||
      mapBrowserEvent.type == ol.events.EventType.MOUSEWHEEL) {
    var map = mapBrowserEvent.map;
    var wheelEvent = /** @type {WheelEvent} */ (mapBrowserEvent.originalEvent);

    if (this.useAnchor_) {
      this.lastAnchor_ = mapBrowserEvent.coordinate;
    }

    // Delta normalisation inspired by
    // https://github.com/mapbox/mapbox-gl-js/blob/001c7b9/js/ui/handler/scroll_zoom.js
    //TODO There's more good stuff in there for inspiration to improve this interaction.
    var delta;
    if (mapBrowserEvent.type == ol.events.EventType.WHEEL) {
      delta = wheelEvent.deltaY;
      if (ol.has.FIREFOX &&
          wheelEvent.deltaMode === ol.global.WheelEvent.DOM_DELTA_PIXEL) {
        delta /= ol.has.DEVICE_PIXEL_RATIO;
      }
      if (wheelEvent.deltaMode === ol.global.WheelEvent.DOM_DELTA_LINE) {
        delta *= 40;
      }
    } else if (mapBrowserEvent.type == ol.events.EventType.MOUSEWHEEL) {
      delta = -wheelEvent.wheelDeltaY;
      if (ol.has.SAFARI) {
        delta /= 3;
      }
    }

    this.delta_ += delta;

    if (this.startTime_ === undefined) {
      this.startTime_ = Date.now();
    }

    var duration = ol.MOUSEWHEELZOOM_TIMEOUT_DURATION;
    var timeLeft = Math.max(duration - (Date.now() - this.startTime_), 0);

    ol.global.clearTimeout(this.timeoutId_);
    this.timeoutId_ = ol.global.setTimeout(
        this.doZoom_.bind(this, map), timeLeft);

    mapBrowserEvent.preventDefault();
    stopEvent = true;
  }
  return !stopEvent;
};


/**
 * @private
 * @param {ol.Map} map Map.
 */
ol.interaction.MouseWheelZoom.prototype.doZoom_ = function(map) {
  var maxDelta = ol.MOUSEWHEELZOOM_MAXDELTA;
  var delta = ol.math.clamp(this.delta_, -maxDelta, maxDelta);

  var view = map.getView();

  ol.interaction.Interaction.zoomByDelta(map, view, -delta, this.lastAnchor_,
      this.duration_);

  this.delta_ = 0;
  this.lastAnchor_ = null;
  this.startTime_ = undefined;
  this.timeoutId_ = undefined;
};


/**
 * Enable or disable using the mouse's location as an anchor when zooming
 * @param {boolean} useAnchor true to zoom to the mouse's location, false
 * to zoom to the center of the map
 * @api
 */
ol.interaction.MouseWheelZoom.prototype.setMouseAnchor = function(useAnchor) {
  this.useAnchor_ = useAnchor;
  if (!useAnchor) {
    this.lastAnchor_ = null;
  }
};

goog.provide('ol.interaction.PinchRotate');

goog.require('ol');
goog.require('ol.View');
goog.require('ol.functions');
goog.require('ol.interaction.Interaction');
goog.require('ol.interaction.Pointer');


/**
 * @classdesc
 * Allows the user to rotate the map by twisting with two fingers
 * on a touch screen.
 *
 * @constructor
 * @extends {ol.interaction.Pointer}
 * @param {olx.interaction.PinchRotateOptions=} opt_options Options.
 * @api stable
 */
ol.interaction.PinchRotate = function(opt_options) {

  ol.interaction.Pointer.call(this, {
    handleDownEvent: ol.interaction.PinchRotate.handleDownEvent_,
    handleDragEvent: ol.interaction.PinchRotate.handleDragEvent_,
    handleUpEvent: ol.interaction.PinchRotate.handleUpEvent_
  });

  var options = opt_options || {};

  /**
   * @private
   * @type {ol.Coordinate}
   */
  this.anchor_ = null;

  /**
   * @private
   * @type {number|undefined}
   */
  this.lastAngle_ = undefined;

  /**
   * @private
   * @type {boolean}
   */
  this.rotating_ = false;

  /**
   * @private
   * @type {number}
   */
  this.rotationDelta_ = 0.0;

  /**
   * @private
   * @type {number}
   */
  this.threshold_ = options.threshold !== undefined ? options.threshold : 0.3;

  /**
   * @private
   * @type {number}
   */
  this.duration_ = options.duration !== undefined ? options.duration : 250;

};
ol.inherits(ol.interaction.PinchRotate, ol.interaction.Pointer);


/**
 * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
 * @this {ol.interaction.PinchRotate}
 * @private
 */
ol.interaction.PinchRotate.handleDragEvent_ = function(mapBrowserEvent) {
  goog.DEBUG && console.assert(this.targetPointers.length >= 2,
      'length of this.targetPointers should be greater than or equal to 2');
  var rotationDelta = 0.0;

  var touch0 = this.targetPointers[0];
  var touch1 = this.targetPointers[1];

  // angle between touches
  var angle = Math.atan2(
      touch1.clientY - touch0.clientY,
      touch1.clientX - touch0.clientX);

  if (this.lastAngle_ !== undefined) {
    var delta = angle - this.lastAngle_;
    this.rotationDelta_ += delta;
    if (!this.rotating_ &&
        Math.abs(this.rotationDelta_) > this.threshold_) {
      this.rotating_ = true;
    }
    rotationDelta = delta;
  }
  this.lastAngle_ = angle;

  var map = mapBrowserEvent.map;

  // rotate anchor point.
  // FIXME: should be the intersection point between the lines:
  //     touch0,touch1 and previousTouch0,previousTouch1
  var viewportPosition = map.getViewport().getBoundingClientRect();
  var centroid = ol.interaction.Pointer.centroid(this.targetPointers);
  centroid[0] -= viewportPosition.left;
  centroid[1] -= viewportPosition.top;
  this.anchor_ = map.getCoordinateFromPixel(centroid);

  // rotate
  if (this.rotating_) {
    var view = map.getView();
    var rotation = view.getRotation();
    map.render();
    ol.interaction.Interaction.rotateWithoutConstraints(map, view,
        rotation + rotationDelta, this.anchor_);
  }
};


/**
 * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
 * @return {boolean} Stop drag sequence?
 * @this {ol.interaction.PinchRotate}
 * @private
 */
ol.interaction.PinchRotate.handleUpEvent_ = function(mapBrowserEvent) {
  if (this.targetPointers.length < 2) {
    var map = mapBrowserEvent.map;
    var view = map.getView();
    view.setHint(ol.View.Hint.INTERACTING, -1);
    if (this.rotating_) {
      var rotation = view.getRotation();
      ol.interaction.Interaction.rotate(
          map, view, rotation, this.anchor_, this.duration_);
    }
    return false;
  } else {
    return true;
  }
};


/**
 * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
 * @return {boolean} Start drag sequence?
 * @this {ol.interaction.PinchRotate}
 * @private
 */
ol.interaction.PinchRotate.handleDownEvent_ = function(mapBrowserEvent) {
  if (this.targetPointers.length >= 2) {
    var map = mapBrowserEvent.map;
    this.anchor_ = null;
    this.lastAngle_ = undefined;
    this.rotating_ = false;
    this.rotationDelta_ = 0.0;
    if (!this.handlingDownUpSequence) {
      map.getView().setHint(ol.View.Hint.INTERACTING, 1);
    }
    map.render();
    return true;
  } else {
    return false;
  }
};


/**
 * @inheritDoc
 */
ol.interaction.PinchRotate.prototype.shouldStopEvent = ol.functions.FALSE;

goog.provide('ol.interaction.PinchZoom');

goog.require('ol');
goog.require('ol.View');
goog.require('ol.functions');
goog.require('ol.interaction.Interaction');
goog.require('ol.interaction.Pointer');


/**
 * @classdesc
 * Allows the user to zoom the map by pinching with two fingers
 * on a touch screen.
 *
 * @constructor
 * @extends {ol.interaction.Pointer}
 * @param {olx.interaction.PinchZoomOptions=} opt_options Options.
 * @api stable
 */
ol.interaction.PinchZoom = function(opt_options) {

  ol.interaction.Pointer.call(this, {
    handleDownEvent: ol.interaction.PinchZoom.handleDownEvent_,
    handleDragEvent: ol.interaction.PinchZoom.handleDragEvent_,
    handleUpEvent: ol.interaction.PinchZoom.handleUpEvent_
  });

  var options = opt_options ? opt_options : {};

  /**
   * @private
   * @type {ol.Coordinate}
   */
  this.anchor_ = null;

  /**
   * @private
   * @type {number}
   */
  this.duration_ = options.duration !== undefined ? options.duration : 400;

  /**
   * @private
   * @type {number|undefined}
   */
  this.lastDistance_ = undefined;

  /**
   * @private
   * @type {number}
   */
  this.lastScaleDelta_ = 1;

};
ol.inherits(ol.interaction.PinchZoom, ol.interaction.Pointer);


/**
 * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
 * @this {ol.interaction.PinchZoom}
 * @private
 */
ol.interaction.PinchZoom.handleDragEvent_ = function(mapBrowserEvent) {
  goog.DEBUG && console.assert(this.targetPointers.length >= 2,
      'length of this.targetPointers should be 2 or more');
  var scaleDelta = 1.0;

  var touch0 = this.targetPointers[0];
  var touch1 = this.targetPointers[1];
  var dx = touch0.clientX - touch1.clientX;
  var dy = touch0.clientY - touch1.clientY;

  // distance between touches
  var distance = Math.sqrt(dx * dx + dy * dy);

  if (this.lastDistance_ !== undefined) {
    scaleDelta = this.lastDistance_ / distance;
  }
  this.lastDistance_ = distance;
  if (scaleDelta != 1.0) {
    this.lastScaleDelta_ = scaleDelta;
  }

  var map = mapBrowserEvent.map;
  var view = map.getView();
  var resolution = view.getResolution();

  // scale anchor point.
  var viewportPosition = map.getViewport().getBoundingClientRect();
  var centroid = ol.interaction.Pointer.centroid(this.targetPointers);
  centroid[0] -= viewportPosition.left;
  centroid[1] -= viewportPosition.top;
  this.anchor_ = map.getCoordinateFromPixel(centroid);

  // scale, bypass the resolution constraint
  map.render();
  ol.interaction.Interaction.zoomWithoutConstraints(
      map, view, resolution * scaleDelta, this.anchor_);

};


/**
 * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
 * @return {boolean} Stop drag sequence?
 * @this {ol.interaction.PinchZoom}
 * @private
 */
ol.interaction.PinchZoom.handleUpEvent_ = function(mapBrowserEvent) {
  if (this.targetPointers.length < 2) {
    var map = mapBrowserEvent.map;
    var view = map.getView();
    view.setHint(ol.View.Hint.INTERACTING, -1);
    var resolution = view.getResolution();
    // Zoom to final resolution, with an animation, and provide a
    // direction not to zoom out/in if user was pinching in/out.
    // Direction is > 0 if pinching out, and < 0 if pinching in.
    var direction = this.lastScaleDelta_ - 1;
    ol.interaction.Interaction.zoom(map, view, resolution,
        this.anchor_, this.duration_, direction);
    return false;
  } else {
    return true;
  }
};


/**
 * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
 * @return {boolean} Start drag sequence?
 * @this {ol.interaction.PinchZoom}
 * @private
 */
ol.interaction.PinchZoom.handleDownEvent_ = function(mapBrowserEvent) {
  if (this.targetPointers.length >= 2) {
    var map = mapBrowserEvent.map;
    this.anchor_ = null;
    this.lastDistance_ = undefined;
    this.lastScaleDelta_ = 1;
    if (!this.handlingDownUpSequence) {
      map.getView().setHint(ol.View.Hint.INTERACTING, 1);
    }
    map.render();
    return true;
  } else {
    return false;
  }
};


/**
 * @inheritDoc
 */
ol.interaction.PinchZoom.prototype.shouldStopEvent = ol.functions.FALSE;

goog.provide('ol.interaction');

goog.require('ol');
goog.require('ol.Collection');
goog.require('ol.Kinetic');
goog.require('ol.interaction.DoubleClickZoom');
goog.require('ol.interaction.DragPan');
goog.require('ol.interaction.DragRotate');
goog.require('ol.interaction.DragZoom');
goog.require('ol.interaction.KeyboardPan');
goog.require('ol.interaction.KeyboardZoom');
goog.require('ol.interaction.MouseWheelZoom');
goog.require('ol.interaction.PinchRotate');
goog.require('ol.interaction.PinchZoom');


/**
 * Set of interactions included in maps by default. Specific interactions can be
 * excluded by setting the appropriate option to false in the constructor
 * options, but the order of the interactions is fixed.  If you want to specify
 * a different order for interactions, you will need to create your own
 * {@link ol.interaction.Interaction} instances and insert them into a
 * {@link ol.Collection} in the order you want before creating your
 * {@link ol.Map} instance. The default set of interactions, in sequence, is:
 * * {@link ol.interaction.DragRotate}
 * * {@link ol.interaction.DoubleClickZoom}
 * * {@link ol.interaction.DragPan}
 * * {@link ol.interaction.PinchRotate}
 * * {@link ol.interaction.PinchZoom}
 * * {@link ol.interaction.KeyboardPan}
 * * {@link ol.interaction.KeyboardZoom}
 * * {@link ol.interaction.MouseWheelZoom}
 * * {@link ol.interaction.DragZoom}
 *
 * @param {olx.interaction.DefaultsOptions=} opt_options Defaults options.
 * @return {ol.Collection.<ol.interaction.Interaction>} A collection of
 * interactions to be used with the ol.Map constructor's interactions option.
 * @api stable
 */
ol.interaction.defaults = function(opt_options) {

  var options = opt_options ? opt_options : {};

  var interactions = new ol.Collection();

  var kinetic = new ol.Kinetic(-0.005, 0.05, 100);

  var altShiftDragRotate = options.altShiftDragRotate !== undefined ?
      options.altShiftDragRotate : true;
  if (altShiftDragRotate) {
    interactions.push(new ol.interaction.DragRotate());
  }

  var doubleClickZoom = options.doubleClickZoom !== undefined ?
      options.doubleClickZoom : true;
  if (doubleClickZoom) {
    interactions.push(new ol.interaction.DoubleClickZoom({
      delta: options.zoomDelta,
      duration: options.zoomDuration
    }));
  }

  var dragPan = options.dragPan !== undefined ? options.dragPan : true;
  if (dragPan) {
    interactions.push(new ol.interaction.DragPan({
      kinetic: kinetic
    }));
  }

  var pinchRotate = options.pinchRotate !== undefined ? options.pinchRotate :
      true;
  if (pinchRotate) {
    interactions.push(new ol.interaction.PinchRotate());
  }

  var pinchZoom = options.pinchZoom !== undefined ? options.pinchZoom : true;
  if (pinchZoom) {
    interactions.push(new ol.interaction.PinchZoom({
      duration: options.zoomDuration
    }));
  }

  var keyboard = options.keyboard !== undefined ? options.keyboard : true;
  if (keyboard) {
    interactions.push(new ol.interaction.KeyboardPan());
    interactions.push(new ol.interaction.KeyboardZoom({
      delta: options.zoomDelta,
      duration: options.zoomDuration
    }));
  }

  var mouseWheelZoom = options.mouseWheelZoom !== undefined ?
      options.mouseWheelZoom : true;
  if (mouseWheelZoom) {
    interactions.push(new ol.interaction.MouseWheelZoom({
      duration: options.zoomDuration
    }));
  }

  var shiftDragZoom = options.shiftDragZoom !== undefined ?
      options.shiftDragZoom : true;
  if (shiftDragZoom) {
    interactions.push(new ol.interaction.DragZoom({
      duration: options.zoomDuration
    }));
  }

  return interactions;

};

goog.provide('ol.layer.Group');

goog.require('ol');
goog.require('ol.asserts');
goog.require('ol.Collection');
goog.require('ol.Object');
goog.require('ol.ObjectEventType');
goog.require('ol.events');
goog.require('ol.events.EventType');
goog.require('ol.extent');
goog.require('ol.layer.Base');
goog.require('ol.obj');
goog.require('ol.source.State');


/**
 * @enum {string}
 */
ol.layer.GroupProperty = {
  LAYERS: 'layers'
};


/**
 * @classdesc
 * A {@link ol.Collection} of layers that are handled together.
 *
 * A generic `change` event is triggered when the group/Collection changes.
 *
 * @constructor
 * @extends {ol.layer.Base}
 * @param {olx.layer.GroupOptions=} opt_options Layer options.
 * @api stable
 */
ol.layer.Group = function(opt_options) {

  var options = opt_options || {};
  var baseOptions = /** @type {olx.layer.GroupOptions} */
      (ol.obj.assign({}, options));
  delete baseOptions.layers;

  var layers = options.layers;

  ol.layer.Base.call(this, baseOptions);

  /**
   * @private
   * @type {Array.<ol.EventsKey>}
   */
  this.layersListenerKeys_ = [];

  /**
   * @private
   * @type {Object.<string, Array.<ol.EventsKey>>}
   */
  this.listenerKeys_ = {};

  ol.events.listen(this,
      ol.Object.getChangeEventType(ol.layer.GroupProperty.LAYERS),
      this.handleLayersChanged_, this);

  if (layers) {
    if (Array.isArray(layers)) {
      layers = new ol.Collection(layers.slice());
    } else {
      ol.asserts.assert(layers instanceof ol.Collection,
          43); // Expected `layers` to be an array or an `ol.Collection`
      layers = layers;
    }
  } else {
    layers = new ol.Collection();
  }

  this.setLayers(layers);

};
ol.inherits(ol.layer.Group, ol.layer.Base);


/**
 * @private
 */
ol.layer.Group.prototype.handleLayerChange_ = function() {
  if (this.getVisible()) {
    this.changed();
  }
};


/**
 * @param {ol.events.Event} event Event.
 * @private
 */
ol.layer.Group.prototype.handleLayersChanged_ = function(event) {
  this.layersListenerKeys_.forEach(ol.events.unlistenByKey);
  this.layersListenerKeys_.length = 0;

  var layers = this.getLayers();
  this.layersListenerKeys_.push(
      ol.events.listen(layers, ol.Collection.EventType.ADD,
          this.handleLayersAdd_, this),
      ol.events.listen(layers, ol.Collection.EventType.REMOVE,
          this.handleLayersRemove_, this));

  for (var id in this.listenerKeys_) {
    this.listenerKeys_[id].forEach(ol.events.unlistenByKey);
  }
  ol.obj.clear(this.listenerKeys_);

  var layersArray = layers.getArray();
  var i, ii, layer;
  for (i = 0, ii = layersArray.length; i < ii; i++) {
    layer = layersArray[i];
    this.listenerKeys_[ol.getUid(layer).toString()] = [
      ol.events.listen(layer, ol.ObjectEventType.PROPERTYCHANGE,
          this.handleLayerChange_, this),
      ol.events.listen(layer, ol.events.EventType.CHANGE,
          this.handleLayerChange_, this)
    ];
  }

  this.changed();
};


/**
 * @param {ol.Collection.Event} collectionEvent Collection event.
 * @private
 */
ol.layer.Group.prototype.handleLayersAdd_ = function(collectionEvent) {
  var layer = /** @type {ol.layer.Base} */ (collectionEvent.element);
  var key = ol.getUid(layer).toString();
  goog.DEBUG && console.assert(!(key in this.listenerKeys_),
      'listeners already registered');
  this.listenerKeys_[key] = [
    ol.events.listen(layer, ol.ObjectEventType.PROPERTYCHANGE,
        this.handleLayerChange_, this),
    ol.events.listen(layer, ol.events.EventType.CHANGE,
        this.handleLayerChange_, this)
  ];
  this.changed();
};


/**
 * @param {ol.Collection.Event} collectionEvent Collection event.
 * @private
 */
ol.layer.Group.prototype.handleLayersRemove_ = function(collectionEvent) {
  var layer = /** @type {ol.layer.Base} */ (collectionEvent.element);
  var key = ol.getUid(layer).toString();
  goog.DEBUG && console.assert(key in this.listenerKeys_, 'no listeners to unregister');
  this.listenerKeys_[key].forEach(ol.events.unlistenByKey);
  delete this.listenerKeys_[key];
  this.changed();
};


/**
 * Returns the {@link ol.Collection collection} of {@link ol.layer.Layer layers}
 * in this group.
 * @return {!ol.Collection.<ol.layer.Base>} Collection of
 *   {@link ol.layer.Base layers} that are part of this group.
 * @observable
 * @api stable
 */
ol.layer.Group.prototype.getLayers = function() {
  return /** @type {!ol.Collection.<ol.layer.Base>} */ (this.get(
      ol.layer.GroupProperty.LAYERS));
};


/**
 * Set the {@link ol.Collection collection} of {@link ol.layer.Layer layers}
 * in this group.
 * @param {!ol.Collection.<ol.layer.Base>} layers Collection of
 *   {@link ol.layer.Base layers} that are part of this group.
 * @observable
 * @api stable
 */
ol.layer.Group.prototype.setLayers = function(layers) {
  this.set(ol.layer.GroupProperty.LAYERS, layers);
};


/**
 * @inheritDoc
 */
ol.layer.Group.prototype.getLayersArray = function(opt_array) {
  var array = opt_array !== undefined ? opt_array : [];
  this.getLayers().forEach(function(layer) {
    layer.getLayersArray(array);
  });
  return array;
};


/**
 * @inheritDoc
 */
ol.layer.Group.prototype.getLayerStatesArray = function(opt_states) {
  var states = opt_states !== undefined ? opt_states : [];

  var pos = states.length;

  this.getLayers().forEach(function(layer) {
    layer.getLayerStatesArray(states);
  });

  var ownLayerState = this.getLayerState();
  var i, ii, layerState;
  for (i = pos, ii = states.length; i < ii; i++) {
    layerState = states[i];
    layerState.opacity *= ownLayerState.opacity;
    layerState.visible = layerState.visible && ownLayerState.visible;
    layerState.maxResolution = Math.min(
        layerState.maxResolution, ownLayerState.maxResolution);
    layerState.minResolution = Math.max(
        layerState.minResolution, ownLayerState.minResolution);
    if (ownLayerState.extent !== undefined) {
      if (layerState.extent !== undefined) {
        layerState.extent = ol.extent.getIntersection(
            layerState.extent, ownLayerState.extent);
      } else {
        layerState.extent = ownLayerState.extent;
      }
    }
  }

  return states;
};


/**
 * @inheritDoc
 */
ol.layer.Group.prototype.getSourceState = function() {
  return ol.source.State.READY;
};

goog.provide('ol.proj.EPSG3857');

goog.require('ol');
goog.require('ol.math');
goog.require('ol.proj');
goog.require('ol.proj.Projection');
goog.require('ol.proj.Units');


/**
 * @classdesc
 * Projection object for web/spherical Mercator (EPSG:3857).
 *
 * @constructor
 * @extends {ol.proj.Projection}
 * @param {string} code Code.
 * @private
 */
ol.proj.EPSG3857_ = function(code) {
  ol.proj.Projection.call(this, {
    code: code,
    units: ol.proj.Units.METERS,
    extent: ol.proj.EPSG3857.EXTENT,
    global: true,
    worldExtent: ol.proj.EPSG3857.WORLD_EXTENT
  });
};
ol.inherits(ol.proj.EPSG3857_, ol.proj.Projection);


/**
 * @inheritDoc
 */
ol.proj.EPSG3857_.prototype.getPointResolution = function(resolution, point) {
  return resolution / ol.math.cosh(point[1] / ol.proj.EPSG3857.RADIUS);
};


/**
 * @const
 * @type {number}
 */
ol.proj.EPSG3857.RADIUS = 6378137;


/**
 * @const
 * @type {number}
 */
ol.proj.EPSG3857.HALF_SIZE = Math.PI * ol.proj.EPSG3857.RADIUS;


/**
 * @const
 * @type {ol.Extent}
 */
ol.proj.EPSG3857.EXTENT = [
  -ol.proj.EPSG3857.HALF_SIZE, -ol.proj.EPSG3857.HALF_SIZE,
  ol.proj.EPSG3857.HALF_SIZE, ol.proj.EPSG3857.HALF_SIZE
];


/**
 * @const
 * @type {ol.Extent}
 */
ol.proj.EPSG3857.WORLD_EXTENT = [-180, -85, 180, 85];


/**
 * Lists several projection codes with the same meaning as EPSG:3857.
 *
 * @type {Array.<string>}
 */
ol.proj.EPSG3857.CODES = [
  'EPSG:3857',
  'EPSG:102100',
  'EPSG:102113',
  'EPSG:900913',
  'urn:ogc:def:crs:EPSG:6.18:3:3857',
  'urn:ogc:def:crs:EPSG::3857',
  'http://www.opengis.net/gml/srs/epsg.xml#3857'
];


/**
 * Projections equal to EPSG:3857.
 *
 * @const
 * @type {Array.<ol.proj.Projection>}
 */
ol.proj.EPSG3857.PROJECTIONS = ol.proj.EPSG3857.CODES.map(function(code) {
  return new ol.proj.EPSG3857_(code);
});


/**
 * Transformation from EPSG:4326 to EPSG:3857.
 *
 * @param {Array.<number>} input Input array of coordinate values.
 * @param {Array.<number>=} opt_output Output array of coordinate values.
 * @param {number=} opt_dimension Dimension (default is `2`).
 * @return {Array.<number>} Output array of coordinate values.
 */
ol.proj.EPSG3857.fromEPSG4326 = function(input, opt_output, opt_dimension) {
  var length = input.length,
      dimension = opt_dimension > 1 ? opt_dimension : 2,
      output = opt_output;
  if (output === undefined) {
    if (dimension > 2) {
      // preserve values beyond second dimension
      output = input.slice();
    } else {
      output = new Array(length);
    }
  }
  goog.DEBUG && console.assert(output.length % dimension === 0,
      'modulus of output.length with dimension should be 0');
  for (var i = 0; i < length; i += dimension) {
    output[i] = ol.proj.EPSG3857.RADIUS * Math.PI * input[i] / 180;
    output[i + 1] = ol.proj.EPSG3857.RADIUS *
        Math.log(Math.tan(Math.PI * (input[i + 1] + 90) / 360));
  }
  return output;
};


/**
 * Transformation from EPSG:3857 to EPSG:4326.
 *
 * @param {Array.<number>} input Input array of coordinate values.
 * @param {Array.<number>=} opt_output Output array of coordinate values.
 * @param {number=} opt_dimension Dimension (default is `2`).
 * @return {Array.<number>} Output array of coordinate values.
 */
ol.proj.EPSG3857.toEPSG4326 = function(input, opt_output, opt_dimension) {
  var length = input.length,
      dimension = opt_dimension > 1 ? opt_dimension : 2,
      output = opt_output;
  if (output === undefined) {
    if (dimension > 2) {
      // preserve values beyond second dimension
      output = input.slice();
    } else {
      output = new Array(length);
    }
  }
  goog.DEBUG && console.assert(output.length % dimension === 0,
      'modulus of output.length with dimension should be 0');
  for (var i = 0; i < length; i += dimension) {
    output[i] = 180 * input[i] / (ol.proj.EPSG3857.RADIUS * Math.PI);
    output[i + 1] = 360 * Math.atan(
        Math.exp(input[i + 1] / ol.proj.EPSG3857.RADIUS)) / Math.PI - 90;
  }
  return output;
};

goog.provide('ol.sphere.WGS84');

goog.require('ol.Sphere');


/**
 * A sphere with radius equal to the semi-major axis of the WGS84 ellipsoid.
 * @const
 * @type {ol.Sphere}
 */
ol.sphere.WGS84 = new ol.Sphere(6378137);

goog.provide('ol.proj.EPSG4326');

goog.require('ol');
goog.require('ol.proj');
goog.require('ol.proj.Projection');
goog.require('ol.proj.Units');
goog.require('ol.sphere.WGS84');


/**
 * @classdesc
 * Projection object for WGS84 geographic coordinates (EPSG:4326).
 *
 * Note that OpenLayers does not strictly comply with the EPSG definition.
 * The EPSG registry defines 4326 as a CRS for Latitude,Longitude (y,x).
 * OpenLayers treats EPSG:4326 as a pseudo-projection, with x,y coordinates.
 *
 * @constructor
 * @extends {ol.proj.Projection}
 * @param {string} code Code.
 * @param {string=} opt_axisOrientation Axis orientation.
 * @private
 */
ol.proj.EPSG4326_ = function(code, opt_axisOrientation) {
  ol.proj.Projection.call(this, {
    code: code,
    units: ol.proj.Units.DEGREES,
    extent: ol.proj.EPSG4326.EXTENT,
    axisOrientation: opt_axisOrientation,
    global: true,
    metersPerUnit: ol.proj.EPSG4326.METERS_PER_UNIT,
    worldExtent: ol.proj.EPSG4326.EXTENT
  });
};
ol.inherits(ol.proj.EPSG4326_, ol.proj.Projection);


/**
 * @inheritDoc
 */
ol.proj.EPSG4326_.prototype.getPointResolution = function(resolution, point) {
  return resolution;
};


/**
 * Extent of the EPSG:4326 projection which is the whole world.
 *
 * @const
 * @type {ol.Extent}
 */
ol.proj.EPSG4326.EXTENT = [-180, -90, 180, 90];


/**
 * @const
 * @type {number}
 */
ol.proj.EPSG4326.METERS_PER_UNIT = Math.PI * ol.sphere.WGS84.radius / 180;


/**
 * Projections equal to EPSG:4326.
 *
 * @const
 * @type {Array.<ol.proj.Projection>}
 */
ol.proj.EPSG4326.PROJECTIONS = [
  new ol.proj.EPSG4326_('CRS:84'),
  new ol.proj.EPSG4326_('EPSG:4326', 'neu'),
  new ol.proj.EPSG4326_('urn:ogc:def:crs:EPSG::4326', 'neu'),
  new ol.proj.EPSG4326_('urn:ogc:def:crs:EPSG:6.6:4326', 'neu'),
  new ol.proj.EPSG4326_('urn:ogc:def:crs:OGC:1.3:CRS84'),
  new ol.proj.EPSG4326_('urn:ogc:def:crs:OGC:2:84'),
  new ol.proj.EPSG4326_('http://www.opengis.net/gml/srs/epsg.xml#4326', 'neu'),
  new ol.proj.EPSG4326_('urn:x-ogc:def:crs:EPSG:4326', 'neu')
];

goog.provide('ol.proj.common');

goog.require('ol.proj');
goog.require('ol.proj.EPSG3857');
goog.require('ol.proj.EPSG4326');


/**
 * FIXME empty description for jsdoc
 * @api
 */
ol.proj.common.add = function() {
  // Add transformations that don't alter coordinates to convert within set of
  // projections with equal meaning.
  ol.proj.addEquivalentProjections(ol.proj.EPSG3857.PROJECTIONS);
  ol.proj.addEquivalentProjections(ol.proj.EPSG4326.PROJECTIONS);
  // Add transformations to convert EPSG:4326 like coordinates to EPSG:3857 like
  // coordinates and back.
  ol.proj.addEquivalentTransforms(
      ol.proj.EPSG4326.PROJECTIONS,
      ol.proj.EPSG3857.PROJECTIONS,
      ol.proj.EPSG3857.fromEPSG4326,
      ol.proj.EPSG3857.toEPSG4326);
};

goog.provide('ol.layer.Image');

goog.require('ol');
goog.require('ol.layer.Layer');


/**
 * @classdesc
 * Server-rendered images that are available for arbitrary extents and
 * resolutions.
 * Note that any property set in the options is set as a {@link ol.Object}
 * property on the layer object; for example, setting `title: 'My Title'` in the
 * options means that `title` is observable, and has get/set accessors.
 *
 * @constructor
 * @extends {ol.layer.Layer}
 * @fires ol.render.Event
 * @param {olx.layer.ImageOptions=} opt_options Layer options.
 * @api stable
 */
ol.layer.Image = function(opt_options) {
  var options = opt_options ? opt_options : {};
  ol.layer.Layer.call(this,  /** @type {olx.layer.LayerOptions} */ (options));
};
ol.inherits(ol.layer.Image, ol.layer.Layer);


/**
 * Return the associated {@link ol.source.Image source} of the image layer.
 * @function
 * @return {ol.source.Image} Source.
 * @api stable
 */
ol.layer.Image.prototype.getSource;

goog.provide('ol.layer.Tile');

goog.require('ol');
goog.require('ol.layer.Layer');
goog.require('ol.obj');


/**
 * @enum {string}
 */
ol.layer.TileProperty = {
  PRELOAD: 'preload',
  USE_INTERIM_TILES_ON_ERROR: 'useInterimTilesOnError'
};


/**
 * @classdesc
 * For layer sources that provide pre-rendered, tiled images in grids that are
 * organized by zoom levels for specific resolutions.
 * Note that any property set in the options is set as a {@link ol.Object}
 * property on the layer object; for example, setting `title: 'My Title'` in the
 * options means that `title` is observable, and has get/set accessors.
 *
 * @constructor
 * @extends {ol.layer.Layer}
 * @fires ol.render.Event
 * @param {olx.layer.TileOptions=} opt_options Tile layer options.
 * @api stable
 */
ol.layer.Tile = function(opt_options) {
  var options = opt_options ? opt_options : {};

  var baseOptions = ol.obj.assign({}, options);

  delete baseOptions.preload;
  delete baseOptions.useInterimTilesOnError;
  ol.layer.Layer.call(this,  /** @type {olx.layer.LayerOptions} */ (baseOptions));

  this.setPreload(options.preload !== undefined ? options.preload : 0);
  this.setUseInterimTilesOnError(options.useInterimTilesOnError !== undefined ?
      options.useInterimTilesOnError : true);
};
ol.inherits(ol.layer.Tile, ol.layer.Layer);


/**
 * Return the level as number to which we will preload tiles up to.
 * @return {number} The level to preload tiles up to.
 * @observable
 * @api
 */
ol.layer.Tile.prototype.getPreload = function() {
  return /** @type {number} */ (this.get(ol.layer.TileProperty.PRELOAD));
};


/**
 * Return the associated {@link ol.source.Tile tilesource} of the layer.
 * @function
 * @return {ol.source.Tile} Source.
 * @api stable
 */
ol.layer.Tile.prototype.getSource;


/**
 * Set the level as number to which we will preload tiles up to.
 * @param {number} preload The level to preload tiles up to.
 * @observable
 * @api
 */
ol.layer.Tile.prototype.setPreload = function(preload) {
  this.set(ol.layer.TileProperty.PRELOAD, preload);
};


/**
 * Whether we use interim tiles on error.
 * @return {boolean} Use interim tiles on error.
 * @observable
 * @api
 */
ol.layer.Tile.prototype.getUseInterimTilesOnError = function() {
  return /** @type {boolean} */ (
      this.get(ol.layer.TileProperty.USE_INTERIM_TILES_ON_ERROR));
};


/**
 * Set whether we use interim tiles on error.
 * @param {boolean} useInterimTilesOnError Use interim tiles on error.
 * @observable
 * @api
 */
ol.layer.Tile.prototype.setUseInterimTilesOnError = function(useInterimTilesOnError) {
  this.set(
      ol.layer.TileProperty.USE_INTERIM_TILES_ON_ERROR, useInterimTilesOnError);
};

goog.provide('ol.render.canvas');


/**
 * @const
 * @type {string}
 */
ol.render.canvas.defaultFont = '10px sans-serif';


/**
 * @const
 * @type {ol.Color}
 */
ol.render.canvas.defaultFillStyle = [0, 0, 0, 1];


/**
 * @const
 * @type {string}
 */
ol.render.canvas.defaultLineCap = 'round';


/**
 * @const
 * @type {Array.<number>}
 */
ol.render.canvas.defaultLineDash = [];


/**
 * @const
 * @type {string}
 */
ol.render.canvas.defaultLineJoin = 'round';


/**
 * @const
 * @type {number}
 */
ol.render.canvas.defaultMiterLimit = 10;


/**
 * @const
 * @type {ol.Color}
 */
ol.render.canvas.defaultStrokeStyle = [0, 0, 0, 1];


/**
 * @const
 * @type {string}
 */
ol.render.canvas.defaultTextAlign = 'center';


/**
 * @const
 * @type {string}
 */
ol.render.canvas.defaultTextBaseline = 'middle';


/**
 * @const
 * @type {number}
 */
ol.render.canvas.defaultLineWidth = 1;


/**
 * @param {CanvasRenderingContext2D} context Context.
 * @param {number} rotation Rotation.
 * @param {number} offsetX X offset.
 * @param {number} offsetY Y offset.
 */
ol.render.canvas.rotateAtOffset = function(context, rotation, offsetX, offsetY) {
  if (rotation !== 0) {
    context.translate(offsetX, offsetY);
    context.rotate(rotation);
    context.translate(-offsetX, -offsetY);
  }
};

goog.provide('ol.style.Image');
goog.provide('ol.style.ImageState');


/**
 * @enum {number}
 */
ol.style.ImageState = {
  IDLE: 0,
  LOADING: 1,
  LOADED: 2,
  ERROR: 3
};


/**
 * @classdesc
 * A base class used for creating subclasses and not instantiated in
 * apps. Base class for {@link ol.style.Icon}, {@link ol.style.Circle} and
 * {@link ol.style.RegularShape}.
 *
 * @constructor
 * @param {ol.StyleImageOptions} options Options.
 * @api
 */
ol.style.Image = function(options) {

  /**
   * @private
   * @type {number}
   */
  this.opacity_ = options.opacity;

  /**
   * @private
   * @type {boolean}
   */
  this.rotateWithView_ = options.rotateWithView;

  /**
   * @private
   * @type {number}
   */
  this.rotation_ = options.rotation;

  /**
   * @private
   * @type {number}
   */
  this.scale_ = options.scale;

  /**
   * @private
   * @type {boolean}
   */
  this.snapToPixel_ = options.snapToPixel;

};


/**
 * Get the symbolizer opacity.
 * @return {number} Opacity.
 * @api
 */
ol.style.Image.prototype.getOpacity = function() {
  return this.opacity_;
};


/**
 * Determine whether the symbolizer rotates with the map.
 * @return {boolean} Rotate with map.
 * @api
 */
ol.style.Image.prototype.getRotateWithView = function() {
  return this.rotateWithView_;
};


/**
 * Get the symoblizer rotation.
 * @return {number} Rotation.
 * @api
 */
ol.style.Image.prototype.getRotation = function() {
  return this.rotation_;
};


/**
 * Get the symbolizer scale.
 * @return {number} Scale.
 * @api
 */
ol.style.Image.prototype.getScale = function() {
  return this.scale_;
};


/**
 * Determine whether the symbolizer should be snapped to a pixel.
 * @return {boolean} The symbolizer should snap to a pixel.
 * @api
 */
ol.style.Image.prototype.getSnapToPixel = function() {
  return this.snapToPixel_;
};


/**
 * Get the anchor point in pixels. The anchor determines the center point for the
 * symbolizer.
 * @abstract
 * @return {Array.<number>} Anchor.
 */
ol.style.Image.prototype.getAnchor = function() {};


/**
 * Get the image element for the symbolizer.
 * @abstract
 * @param {number} pixelRatio Pixel ratio.
 * @return {HTMLCanvasElement|HTMLVideoElement|Image} Image element.
 */
ol.style.Image.prototype.getImage = function(pixelRatio) {};


/**
 * @abstract
 * @param {number} pixelRatio Pixel ratio.
 * @return {HTMLCanvasElement|HTMLVideoElement|Image} Image element.
 */
ol.style.Image.prototype.getHitDetectionImage = function(pixelRatio) {};


/**
 * @abstract
 * @return {ol.style.ImageState} Image state.
 */
ol.style.Image.prototype.getImageState = function() {};


/**
 * @abstract
 * @return {ol.Size} Image size.
 */
ol.style.Image.prototype.getImageSize = function() {};


/**
 * @abstract
 * @return {ol.Size} Size of the hit-detection image.
 */
ol.style.Image.prototype.getHitDetectionImageSize = function() {};


/**
 * Get the origin of the symbolizer.
 * @abstract
 * @return {Array.<number>} Origin.
 */
ol.style.Image.prototype.getOrigin = function() {};


/**
 * Get the size of the symbolizer (in pixels).
 * @abstract
 * @return {ol.Size} Size.
 */
ol.style.Image.prototype.getSize = function() {};


/**
 * Set the opacity.
 *
 * @param {number} opacity Opacity.
 * @api
 */
ol.style.Image.prototype.setOpacity = function(opacity) {
  this.opacity_ = opacity;
};


/**
 * Set whether to rotate the style with the view.
 *
 * @param {boolean} rotateWithView Rotate with map.
 */
ol.style.Image.prototype.setRotateWithView = function(rotateWithView) {
  this.rotateWithView_ = rotateWithView;
};


/**
 * Set the rotation.
 *
 * @param {number} rotation Rotation.
 * @api
 */
ol.style.Image.prototype.setRotation = function(rotation) {
  this.rotation_ = rotation;
};


/**
 * Set the scale.
 *
 * @param {number} scale Scale.
 * @api
 */
ol.style.Image.prototype.setScale = function(scale) {
  this.scale_ = scale;
};


/**
 * Set whether to snap the image to the closest pixel.
 *
 * @param {boolean} snapToPixel Snap to pixel?
 */
ol.style.Image.prototype.setSnapToPixel = function(snapToPixel) {
  this.snapToPixel_ = snapToPixel;
};


/**
 * @abstract
 * @param {function(this: T, ol.events.Event)} listener Listener function.
 * @param {T} thisArg Value to use as `this` when executing `listener`.
 * @return {ol.EventsKey|undefined} Listener key.
 * @template T
 */
ol.style.Image.prototype.listenImageChange = function(listener, thisArg) {};


/**
 * Load not yet loaded URI.
 * @abstract
 */
ol.style.Image.prototype.load = function() {};


/**
 * @abstract
 * @param {function(this: T, ol.events.Event)} listener Listener function.
 * @param {T} thisArg Value to use as `this` when executing `listener`.
 * @template T
 */
ol.style.Image.prototype.unlistenImageChange = function(listener, thisArg) {};

goog.provide('ol.style.Circle');

goog.require('ol');
goog.require('ol.color');
goog.require('ol.colorlike');
goog.require('ol.dom');
goog.require('ol.has');
goog.require('ol.render.canvas');
goog.require('ol.style.Image');
goog.require('ol.style.ImageState');


/**
 * @classdesc
 * Set circle style for vector features.
 *
 * @constructor
 * @param {olx.style.CircleOptions=} opt_options Options.
 * @extends {ol.style.Image}
 * @api
 */
ol.style.Circle = function(opt_options) {

  var options = opt_options || {};

  /**
   * @private
   * @type {Array.<string>}
   */
  this.checksums_ = null;

  /**
   * @private
   * @type {HTMLCanvasElement}
   */
  this.canvas_ = null;

  /**
   * @private
   * @type {HTMLCanvasElement}
   */
  this.hitDetectionCanvas_ = null;

  /**
   * @private
   * @type {ol.style.Fill}
   */
  this.fill_ = options.fill !== undefined ? options.fill : null;

  /**
   * @private
   * @type {ol.style.Stroke}
   */
  this.stroke_ = options.stroke !== undefined ? options.stroke : null;

  /**
   * @private
   * @type {number}
   */
  this.radius_ = options.radius;

  /**
   * @private
   * @type {Array.<number>}
   */
  this.origin_ = [0, 0];

  /**
   * @private
   * @type {Array.<number>}
   */
  this.anchor_ = null;

  /**
   * @private
   * @type {ol.Size}
   */
  this.size_ = null;

  /**
   * @private
   * @type {ol.Size}
   */
  this.imageSize_ = null;

  /**
   * @private
   * @type {ol.Size}
   */
  this.hitDetectionImageSize_ = null;

  this.render_(options.atlasManager);

  /**
   * @type {boolean}
   */
  var snapToPixel = options.snapToPixel !== undefined ?
      options.snapToPixel : true;

  ol.style.Image.call(this, {
    opacity: 1,
    rotateWithView: false,
    rotation: 0,
    scale: 1,
    snapToPixel: snapToPixel
  });

};
ol.inherits(ol.style.Circle, ol.style.Image);


/**
 * @inheritDoc
 */
ol.style.Circle.prototype.getAnchor = function() {
  return this.anchor_;
};


/**
 * Get the fill style for the circle.
 * @return {ol.style.Fill} Fill style.
 * @api
 */
ol.style.Circle.prototype.getFill = function() {
  return this.fill_;
};


/**
 * @inheritDoc
 */
ol.style.Circle.prototype.getHitDetectionImage = function(pixelRatio) {
  return this.hitDetectionCanvas_;
};


/**
 * Get the image used to render the circle.
 * @param {number} pixelRatio Pixel ratio.
 * @return {HTMLCanvasElement} Canvas element.
 * @api
 */
ol.style.Circle.prototype.getImage = function(pixelRatio) {
  return this.canvas_;
};


/**
 * @inheritDoc
 */
ol.style.Circle.prototype.getImageState = function() {
  return ol.style.ImageState.LOADED;
};


/**
 * @inheritDoc
 */
ol.style.Circle.prototype.getImageSize = function() {
  return this.imageSize_;
};


/**
 * @inheritDoc
 */
ol.style.Circle.prototype.getHitDetectionImageSize = function() {
  return this.hitDetectionImageSize_;
};


/**
 * @inheritDoc
 */
ol.style.Circle.prototype.getOrigin = function() {
  return this.origin_;
};


/**
 * Get the circle radius.
 * @return {number} Radius.
 * @api
 */
ol.style.Circle.prototype.getRadius = function() {
  return this.radius_;
};


/**
 * @inheritDoc
 */
ol.style.Circle.prototype.getSize = function() {
  return this.size_;
};


/**
 * Get the stroke style for the circle.
 * @return {ol.style.Stroke} Stroke style.
 * @api
 */
ol.style.Circle.prototype.getStroke = function() {
  return this.stroke_;
};


/**
 * @inheritDoc
 */
ol.style.Circle.prototype.listenImageChange = ol.nullFunction;


/**
 * @inheritDoc
 */
ol.style.Circle.prototype.load = ol.nullFunction;


/**
 * @inheritDoc
 */
ol.style.Circle.prototype.unlistenImageChange = ol.nullFunction;


/**
 * @private
 * @param {ol.style.AtlasManager|undefined} atlasManager An atlas manager.
 */
ol.style.Circle.prototype.render_ = function(atlasManager) {
  var imageSize;
  var lineDash = null;
  var strokeStyle;
  var strokeWidth = 0;

  if (this.stroke_) {
    strokeStyle = ol.color.asString(this.stroke_.getColor());
    strokeWidth = this.stroke_.getWidth();
    if (strokeWidth === undefined) {
      strokeWidth = ol.render.canvas.defaultLineWidth;
    }
    lineDash = this.stroke_.getLineDash();
    if (!ol.has.CANVAS_LINE_DASH) {
      lineDash = null;
    }
  }


  var size = 2 * (this.radius_ + strokeWidth) + 1;

  /** @type {ol.CircleRenderOptions} */
  var renderOptions = {
    strokeStyle: strokeStyle,
    strokeWidth: strokeWidth,
    size: size,
    lineDash: lineDash
  };

  if (atlasManager === undefined) {
    // no atlas manager is used, create a new canvas
    var context = ol.dom.createCanvasContext2D(size, size);
    this.canvas_ = context.canvas;

    // canvas.width and height are rounded to the closest integer
    size = this.canvas_.width;
    imageSize = size;

    // draw the circle on the canvas
    this.draw_(renderOptions, context, 0, 0);

    this.createHitDetectionCanvas_(renderOptions);
  } else {
    // an atlas manager is used, add the symbol to an atlas
    size = Math.round(size);

    var hasCustomHitDetectionImage = !this.fill_;
    var renderHitDetectionCallback;
    if (hasCustomHitDetectionImage) {
      // render the hit-detection image into a separate atlas image
      renderHitDetectionCallback =
          this.drawHitDetectionCanvas_.bind(this, renderOptions);
    }

    var id = this.getChecksum();
    var info = atlasManager.add(
        id, size, size, this.draw_.bind(this, renderOptions),
        renderHitDetectionCallback);
    goog.DEBUG && console.assert(info, 'circle radius is too large');

    this.canvas_ = info.image;
    this.origin_ = [info.offsetX, info.offsetY];
    imageSize = info.image.width;

    if (hasCustomHitDetectionImage) {
      this.hitDetectionCanvas_ = info.hitImage;
      this.hitDetectionImageSize_ =
          [info.hitImage.width, info.hitImage.height];
    } else {
      this.hitDetectionCanvas_ = this.canvas_;
      this.hitDetectionImageSize_ = [imageSize, imageSize];
    }
  }

  this.anchor_ = [size / 2, size / 2];
  this.size_ = [size, size];
  this.imageSize_ = [imageSize, imageSize];
};


/**
 * @private
 * @param {ol.CircleRenderOptions} renderOptions Render options.
 * @param {CanvasRenderingContext2D} context The rendering context.
 * @param {number} x The origin for the symbol (x).
 * @param {number} y The origin for the symbol (y).
 */
ol.style.Circle.prototype.draw_ = function(renderOptions, context, x, y) {
  // reset transform
  context.setTransform(1, 0, 0, 1, 0, 0);

  // then move to (x, y)
  context.translate(x, y);

  context.beginPath();
  context.arc(
      renderOptions.size / 2, renderOptions.size / 2,
      this.radius_, 0, 2 * Math.PI, true);

  if (this.fill_) {
    context.fillStyle = ol.colorlike.asColorLike(this.fill_.getColor());
    context.fill();
  }
  if (this.stroke_) {
    context.strokeStyle = renderOptions.strokeStyle;
    context.lineWidth = renderOptions.strokeWidth;
    if (renderOptions.lineDash) {
      context.setLineDash(renderOptions.lineDash);
    }
    context.stroke();
  }
  context.closePath();
};


/**
 * @private
 * @param {ol.CircleRenderOptions} renderOptions Render options.
 */
ol.style.Circle.prototype.createHitDetectionCanvas_ = function(renderOptions) {
  this.hitDetectionImageSize_ = [renderOptions.size, renderOptions.size];
  if (this.fill_) {
    this.hitDetectionCanvas_ = this.canvas_;
    return;
  }

  // if no fill style is set, create an extra hit-detection image with a
  // default fill style
  var context = ol.dom.createCanvasContext2D(renderOptions.size, renderOptions.size);
  this.hitDetectionCanvas_ = context.canvas;

  this.drawHitDetectionCanvas_(renderOptions, context, 0, 0);
};


/**
 * @private
 * @param {ol.CircleRenderOptions} renderOptions Render options.
 * @param {CanvasRenderingContext2D} context The context.
 * @param {number} x The origin for the symbol (x).
 * @param {number} y The origin for the symbol (y).
 */
ol.style.Circle.prototype.drawHitDetectionCanvas_ = function(renderOptions, context, x, y) {
  // reset transform
  context.setTransform(1, 0, 0, 1, 0, 0);

  // then move to (x, y)
  context.translate(x, y);

  context.beginPath();
  context.arc(
      renderOptions.size / 2, renderOptions.size / 2,
      this.radius_, 0, 2 * Math.PI, true);

  context.fillStyle = ol.color.asString(ol.render.canvas.defaultFillStyle);
  context.fill();
  if (this.stroke_) {
    context.strokeStyle = renderOptions.strokeStyle;
    context.lineWidth = renderOptions.strokeWidth;
    if (renderOptions.lineDash) {
      context.setLineDash(renderOptions.lineDash);
    }
    context.stroke();
  }
  context.closePath();
};


/**
 * @return {string} The checksum.
 */
ol.style.Circle.prototype.getChecksum = function() {
  var strokeChecksum = this.stroke_ ?
      this.stroke_.getChecksum() : '-';
  var fillChecksum = this.fill_ ?
      this.fill_.getChecksum() : '-';

  var recalculate = !this.checksums_ ||
      (strokeChecksum != this.checksums_[1] ||
      fillChecksum != this.checksums_[2] ||
      this.radius_ != this.checksums_[3]);

  if (recalculate) {
    var checksum = 'c' + strokeChecksum + fillChecksum +
        (this.radius_ !== undefined ? this.radius_.toString() : '-');
    this.checksums_ = [checksum, strokeChecksum, fillChecksum, this.radius_];
  }

  return this.checksums_[0];
};

goog.provide('ol.style.Fill');

goog.require('ol');
goog.require('ol.color');


/**
 * @classdesc
 * Set fill style for vector features.
 *
 * @constructor
 * @param {olx.style.FillOptions=} opt_options Options.
 * @api
 */
ol.style.Fill = function(opt_options) {

  var options = opt_options || {};

  /**
   * @private
   * @type {ol.Color|ol.ColorLike}
   */
  this.color_ = options.color !== undefined ? options.color : null;

  /**
   * @private
   * @type {string|undefined}
   */
  this.checksum_ = undefined;
};


/**
 * Get the fill color.
 * @return {ol.Color|ol.ColorLike} Color.
 * @api
 */
ol.style.Fill.prototype.getColor = function() {
  return this.color_;
};


/**
 * Set the color.
 *
 * @param {ol.Color|ol.ColorLike} color Color.
 * @api
 */
ol.style.Fill.prototype.setColor = function(color) {
  this.color_ = color;
  this.checksum_ = undefined;
};


/**
 * @return {string} The checksum.
 */
ol.style.Fill.prototype.getChecksum = function() {
  if (this.checksum_ === undefined) {
    if (
        this.color_ instanceof CanvasPattern ||
        this.color_ instanceof CanvasGradient
    ) {
      this.checksum_ = ol.getUid(this.color_).toString();
    } else {
      this.checksum_ = 'f' + (this.color_ ?
          ol.color.asString(this.color_) : '-');
    }
  }

  return this.checksum_;
};

// Copyright 2008 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/**
 * @fileoverview Namespace with crypto related helper functions.
 */

goog.provide('goog.crypt');

goog.require('goog.array');
goog.require('goog.asserts');


/**
 * Turns a string into an array of bytes; a "byte" being a JS number in the
 * range 0-255.
 * @param {string} str String value to arrify.
 * @return {!Array<number>} Array of numbers corresponding to the
 *     UCS character codes of each character in str.
 */
goog.crypt.stringToByteArray = function(str) {
  var output = [], p = 0;
  for (var i = 0; i < str.length; i++) {
    var c = str.charCodeAt(i);
    while (c > 0xff) {
      output[p++] = c & 0xff;
      c >>= 8;
    }
    output[p++] = c;
  }
  return output;
};


/**
 * Turns an array of numbers into the string given by the concatenation of the
 * characters to which the numbers correspond.
 * @param {!Uint8Array|!Array<number>} bytes Array of numbers representing
 *     characters.
 * @return {string} Stringification of the array.
 */
goog.crypt.byteArrayToString = function(bytes) {
  var CHUNK_SIZE = 8192;

  // Special-case the simple case for speed's sake.
  if (bytes.length <= CHUNK_SIZE) {
    return String.fromCharCode.apply(null, bytes);
  }

  // The remaining logic splits conversion by chunks since
  // Function#apply() has a maximum parameter count.
  // See discussion: http://goo.gl/LrWmZ9

  var str = '';
  for (var i = 0; i < bytes.length; i += CHUNK_SIZE) {
    var chunk = goog.array.slice(bytes, i, i + CHUNK_SIZE);
    str += String.fromCharCode.apply(null, chunk);
  }
  return str;
};


/**
 * Turns an array of numbers into the hex string given by the concatenation of
 * the hex values to which the numbers correspond.
 * @param {Uint8Array|Array<number>} array Array of numbers representing
 *     characters.
 * @return {string} Hex string.
 */
goog.crypt.byteArrayToHex = function(array) {
  return goog.array
      .map(
          array,
          function(numByte) {
            var hexByte = numByte.toString(16);
            return hexByte.length > 1 ? hexByte : '0' + hexByte;
          })
      .join('');
};


/**
 * Converts a hex string into an integer array.
 * @param {string} hexString Hex string of 16-bit integers (two characters
 *     per integer).
 * @return {!Array<number>} Array of {0,255} integers for the given string.
 */
goog.crypt.hexToByteArray = function(hexString) {
  goog.asserts.assert(
      hexString.length % 2 == 0, 'Key string length must be multiple of 2');
  var arr = [];
  for (var i = 0; i < hexString.length; i += 2) {
    arr.push(parseInt(hexString.substring(i, i + 2), 16));
  }
  return arr;
};


/**
 * Converts a JS string to a UTF-8 "byte" array.
 * @param {string} str 16-bit unicode string.
 * @return {!Array<number>} UTF-8 byte array.
 */
goog.crypt.stringToUtf8ByteArray = function(str) {
  // TODO(user): Use native implementations if/when available
  var out = [], p = 0;
  for (var i = 0; i < str.length; i++) {
    var c = str.charCodeAt(i);
    if (c < 128) {
      out[p++] = c;
    } else if (c < 2048) {
      out[p++] = (c >> 6) | 192;
      out[p++] = (c & 63) | 128;
    } else if (
        ((c & 0xFC00) == 0xD800) && (i + 1) < str.length &&
        ((str.charCodeAt(i + 1) & 0xFC00) == 0xDC00)) {
      // Surrogate Pair
      c = 0x10000 + ((c & 0x03FF) << 10) + (str.charCodeAt(++i) & 0x03FF);
      out[p++] = (c >> 18) | 240;
      out[p++] = ((c >> 12) & 63) | 128;
      out[p++] = ((c >> 6) & 63) | 128;
      out[p++] = (c & 63) | 128;
    } else {
      out[p++] = (c >> 12) | 224;
      out[p++] = ((c >> 6) & 63) | 128;
      out[p++] = (c & 63) | 128;
    }
  }
  return out;
};


/**
 * Converts a UTF-8 byte array to JavaScript's 16-bit Unicode.
 * @param {Uint8Array|Array<number>} bytes UTF-8 byte array.
 * @return {string} 16-bit Unicode string.
 */
goog.crypt.utf8ByteArrayToString = function(bytes) {
  // TODO(user): Use native implementations if/when available
  var out = [], pos = 0, c = 0;
  while (pos < bytes.length) {
    var c1 = bytes[pos++];
    if (c1 < 128) {
      out[c++] = String.fromCharCode(c1);
    } else if (c1 > 191 && c1 < 224) {
      var c2 = bytes[pos++];
      out[c++] = String.fromCharCode((c1 & 31) << 6 | c2 & 63);
    } else if (c1 > 239 && c1 < 365) {
      // Surrogate Pair
      var c2 = bytes[pos++];
      var c3 = bytes[pos++];
      var c4 = bytes[pos++];
      var u = ((c1 & 7) << 18 | (c2 & 63) << 12 | (c3 & 63) << 6 | c4 & 63) -
          0x10000;
      out[c++] = String.fromCharCode(0xD800 + (u >> 10));
      out[c++] = String.fromCharCode(0xDC00 + (u & 1023));
    } else {
      var c2 = bytes[pos++];
      var c3 = bytes[pos++];
      out[c++] =
          String.fromCharCode((c1 & 15) << 12 | (c2 & 63) << 6 | c3 & 63);
    }
  }
  return out.join('');
};


/**
 * XOR two byte arrays.
 * @param {!Uint8Array|!Int8Array|!Array<number>} bytes1 Byte array 1.
 * @param {!Uint8Array|!Int8Array|!Array<number>} bytes2 Byte array 2.
 * @return {!Array<number>} Resulting XOR of the two byte arrays.
 */
goog.crypt.xorByteArray = function(bytes1, bytes2) {
  goog.asserts.assert(
      bytes1.length == bytes2.length, 'XOR array lengths must match');

  var result = [];
  for (var i = 0; i < bytes1.length; i++) {
    result.push(bytes1[i] ^ bytes2[i]);
  }
  return result;
};

// Copyright 2011 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/**
 * @fileoverview Abstract cryptographic hash interface.
 *
 * See goog.crypt.Sha1 and goog.crypt.Md5 for sample implementations.
 *
 */

goog.provide('goog.crypt.Hash');



/**
 * Create a cryptographic hash instance.
 *
 * @constructor
 * @struct
 */
goog.crypt.Hash = function() {
  /**
   * The block size for the hasher.
   * @type {number}
   */
  this.blockSize = -1;
};


/**
 * Resets the internal accumulator.
 */
goog.crypt.Hash.prototype.reset = goog.abstractMethod;


/**
 * Adds a byte array (array with values in [0-255] range) or a string (might
 * only contain 8-bit, i.e., Latin1 characters) to the internal accumulator.
 *
 * Many hash functions operate on blocks of data and implement optimizations
 * when a full chunk of data is readily available. Hence it is often preferable
 * to provide large chunks of data (a kilobyte or more) than to repeatedly
 * call the update method with few tens of bytes. If this is not possible, or
 * not feasible, it might be good to provide data in multiplies of hash block
 * size (often 64 bytes). Please see the implementation and performance tests
 * of your favourite hash.
 *
 * @param {Array<number>|Uint8Array|string} bytes Data used for the update.
 * @param {number=} opt_length Number of bytes to use.
 */
goog.crypt.Hash.prototype.update = goog.abstractMethod;


/**
 * @return {!Array<number>} The finalized hash computed
 *     from the internal accumulator.
 */
goog.crypt.Hash.prototype.digest = goog.abstractMethod;

// Copyright 2011 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/**
 * @fileoverview MD5 cryptographic hash.
 * Implementation of http://tools.ietf.org/html/rfc1321 with common
 * optimizations and tweaks (see http://en.wikipedia.org/wiki/MD5).
 *
 * Usage:
 *   var md5 = new goog.crypt.Md5();
 *   md5.update(bytes);
 *   var hash = md5.digest();
 *
 * Performance:
 *   Chrome 23              ~680 Mbit/s
 *   Chrome 13 (in a VM)    ~250 Mbit/s
 *   Firefox 6.0 (in a VM)  ~100 Mbit/s
 *   IE9 (in a VM)           ~27 Mbit/s
 *   Firefox 3.6             ~15 Mbit/s
 *   IE8 (in a VM)           ~13 Mbit/s
 *
 */

goog.provide('goog.crypt.Md5');

goog.require('goog.crypt.Hash');



/**
 * MD5 cryptographic hash constructor.
 * @constructor
 * @extends {goog.crypt.Hash}
 * @final
 * @struct
 */
goog.crypt.Md5 = function() {
  goog.crypt.Md5.base(this, 'constructor');

  this.blockSize = 512 / 8;

  /**
   * Holds the current values of accumulated A-D variables (MD buffer).
   * @type {!Array<number>}
   * @private
   */
  this.chain_ = new Array(4);

  /**
   * A buffer holding the data until the whole block can be processed.
   * @type {!Array<number>}
   * @private
   */
  this.block_ = new Array(this.blockSize);

  /**
   * The length of yet-unprocessed data as collected in the block.
   * @type {number}
   * @private
   */
  this.blockLength_ = 0;

  /**
   * The total length of the message so far.
   * @type {number}
   * @private
   */
  this.totalLength_ = 0;

  this.reset();
};
goog.inherits(goog.crypt.Md5, goog.crypt.Hash);


/**
 * Integer rotation constants used by the abbreviated implementation.
 * They are hardcoded in the unrolled implementation, so it is left
 * here commented out.
 * @type {Array<number>}
 * @private
 *
goog.crypt.Md5.S_ = [
  7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22,
  5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20,
  4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23,
  6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21
];
 */

/**
 * Sine function constants used by the abbreviated implementation.
 * They are hardcoded in the unrolled implementation, so it is left
 * here commented out.
 * @type {Array<number>}
 * @private
 *
goog.crypt.Md5.T_ = [
  0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee,
  0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
  0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
  0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
  0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa,
  0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
  0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed,
  0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
  0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
  0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
  0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05,
  0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
  0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039,
  0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
  0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
  0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391
];
 */


/** @override */
goog.crypt.Md5.prototype.reset = function() {
  this.chain_[0] = 0x67452301;
  this.chain_[1] = 0xefcdab89;
  this.chain_[2] = 0x98badcfe;
  this.chain_[3] = 0x10325476;

  this.blockLength_ = 0;
  this.totalLength_ = 0;
};


/**
 * Internal compress helper function. It takes a block of data (64 bytes)
 * and updates the accumulator.
 * @param {Array<number>|Uint8Array|string} buf The block to compress.
 * @param {number=} opt_offset Offset of the block in the buffer.
 * @private
 */
goog.crypt.Md5.prototype.compress_ = function(buf, opt_offset) {
  if (!opt_offset) {
    opt_offset = 0;
  }

  // We allocate the array every time, but it's cheap in practice.
  var X = new Array(16);

  // Get 16 little endian words. It is not worth unrolling this for Chrome 11.
  if (goog.isString(buf)) {
    for (var i = 0; i < 16; ++i) {
      X[i] = (buf.charCodeAt(opt_offset++)) |
          (buf.charCodeAt(opt_offset++) << 8) |
          (buf.charCodeAt(opt_offset++) << 16) |
          (buf.charCodeAt(opt_offset++) << 24);
    }
  } else {
    for (var i = 0; i < 16; ++i) {
      X[i] = (buf[opt_offset++]) | (buf[opt_offset++] << 8) |
          (buf[opt_offset++] << 16) | (buf[opt_offset++] << 24);
    }
  }

  var A = this.chain_[0];
  var B = this.chain_[1];
  var C = this.chain_[2];
  var D = this.chain_[3];
  var sum = 0;

  /*
   * This is an abbreviated implementation, it is left here commented out for
   * reference purposes. See below for an unrolled version in use.
   *
  var f, n, tmp;
  for (var i = 0; i < 64; ++i) {

    if (i < 16) {
      f = (D ^ (B & (C ^ D)));
      n = i;
    } else if (i < 32) {
      f = (C ^ (D & (B ^ C)));
      n = (5 * i + 1) % 16;
    } else if (i < 48) {
      f = (B ^ C ^ D);
      n = (3 * i + 5) % 16;
    } else {
      f = (C ^ (B | (~D)));
      n = (7 * i) % 16;
    }

    tmp = D;
    D = C;
    C = B;
    sum = (A + f + goog.crypt.Md5.T_[i] + X[n]) & 0xffffffff;
    B += ((sum << goog.crypt.Md5.S_[i]) & 0xffffffff) |
         (sum >>> (32 - goog.crypt.Md5.S_[i]));
    A = tmp;
  }
   */

  /*
   * This is an unrolled MD5 implementation, which gives ~30% speedup compared
   * to the abbreviated implementation above, as measured on Chrome 11. It is
   * important to keep 32-bit croppings to minimum and inline the integer
   * rotation.
   */
  sum = (A + (D ^ (B & (C ^ D))) + X[0] + 0xd76aa478) & 0xffffffff;
  A = B + (((sum << 7) & 0xffffffff) | (sum >>> 25));
  sum = (D + (C ^ (A & (B ^ C))) + X[1] + 0xe8c7b756) & 0xffffffff;
  D = A + (((sum << 12) & 0xffffffff) | (sum >>> 20));
  sum = (C + (B ^ (D & (A ^ B))) + X[2] + 0x242070db) & 0xffffffff;
  C = D + (((sum << 17) & 0xffffffff) | (sum >>> 15));
  sum = (B + (A ^ (C & (D ^ A))) + X[3] + 0xc1bdceee) & 0xffffffff;
  B = C + (((sum << 22) & 0xffffffff) | (sum >>> 10));
  sum = (A + (D ^ (B & (C ^ D))) + X[4] + 0xf57c0faf) & 0xffffffff;
  A = B + (((sum << 7) & 0xffffffff) | (sum >>> 25));
  sum = (D + (C ^ (A & (B ^ C))) + X[5] + 0x4787c62a) & 0xffffffff;
  D = A + (((sum << 12) & 0xffffffff) | (sum >>> 20));
  sum = (C + (B ^ (D & (A ^ B))) + X[6] + 0xa8304613) & 0xffffffff;
  C = D + (((sum << 17) & 0xffffffff) | (sum >>> 15));
  sum = (B + (A ^ (C & (D ^ A))) + X[7] + 0xfd469501) & 0xffffffff;
  B = C + (((sum << 22) & 0xffffffff) | (sum >>> 10));
  sum = (A + (D ^ (B & (C ^ D))) + X[8] + 0x698098d8) & 0xffffffff;
  A = B + (((sum << 7) & 0xffffffff) | (sum >>> 25));
  sum = (D + (C ^ (A & (B ^ C))) + X[9] + 0x8b44f7af) & 0xffffffff;
  D = A + (((sum << 12) & 0xffffffff) | (sum >>> 20));
  sum = (C + (B ^ (D & (A ^ B))) + X[10] + 0xffff5bb1) & 0xffffffff;
  C = D + (((sum << 17) & 0xffffffff) | (sum >>> 15));
  sum = (B + (A ^ (C & (D ^ A))) + X[11] + 0x895cd7be) & 0xffffffff;
  B = C + (((sum << 22) & 0xffffffff) | (sum >>> 10));
  sum = (A + (D ^ (B & (C ^ D))) + X[12] + 0x6b901122) & 0xffffffff;
  A = B + (((sum << 7) & 0xffffffff) | (sum >>> 25));
  sum = (D + (C ^ (A & (B ^ C))) + X[13] + 0xfd987193) & 0xffffffff;
  D = A + (((sum << 12) & 0xffffffff) | (sum >>> 20));
  sum = (C + (B ^ (D & (A ^ B))) + X[14] + 0xa679438e) & 0xffffffff;
  C = D + (((sum << 17) & 0xffffffff) | (sum >>> 15));
  sum = (B + (A ^ (C & (D ^ A))) + X[15] + 0x49b40821) & 0xffffffff;
  B = C + (((sum << 22) & 0xffffffff) | (sum >>> 10));
  sum = (A + (C ^ (D & (B ^ C))) + X[1] + 0xf61e2562) & 0xffffffff;
  A = B + (((sum << 5) & 0xffffffff) | (sum >>> 27));
  sum = (D + (B ^ (C & (A ^ B))) + X[6] + 0xc040b340) & 0xffffffff;
  D = A + (((sum << 9) & 0xffffffff) | (sum >>> 23));
  sum = (C + (A ^ (B & (D ^ A))) + X[11] + 0x265e5a51) & 0xffffffff;
  C = D + (((sum << 14) & 0xffffffff) | (sum >>> 18));
  sum = (B + (D ^ (A & (C ^ D))) + X[0] + 0xe9b6c7aa) & 0xffffffff;
  B = C + (((sum << 20) & 0xffffffff) | (sum >>> 12));
  sum = (A + (C ^ (D & (B ^ C))) + X[5] + 0xd62f105d) & 0xffffffff;
  A = B + (((sum << 5) & 0xffffffff) | (sum >>> 27));
  sum = (D + (B ^ (C & (A ^ B))) + X[10] + 0x02441453) & 0xffffffff;
  D = A + (((sum << 9) & 0xffffffff) | (sum >>> 23));
  sum = (C + (A ^ (B & (D ^ A))) + X[15] + 0xd8a1e681) & 0xffffffff;
  C = D + (((sum << 14) & 0xffffffff) | (sum >>> 18));
  sum = (B + (D ^ (A & (C ^ D))) + X[4] + 0xe7d3fbc8) & 0xffffffff;
  B = C + (((sum << 20) & 0xffffffff) | (sum >>> 12));
  sum = (A + (C ^ (D & (B ^ C))) + X[9] + 0x21e1cde6) & 0xffffffff;
  A = B + (((sum << 5) & 0xffffffff) | (sum >>> 27));
  sum = (D + (B ^ (C & (A ^ B))) + X[14] + 0xc33707d6) & 0xffffffff;
  D = A + (((sum << 9) & 0xffffffff) | (sum >>> 23));
  sum = (C + (A ^ (B & (D ^ A))) + X[3] + 0xf4d50d87) & 0xffffffff;
  C = D + (((sum << 14) & 0xffffffff) | (sum >>> 18));
  sum = (B + (D ^ (A & (C ^ D))) + X[8] + 0x455a14ed) & 0xffffffff;
  B = C + (((sum << 20) & 0xffffffff) | (sum >>> 12));
  sum = (A + (C ^ (D & (B ^ C))) + X[13] + 0xa9e3e905) & 0xffffffff;
  A = B + (((sum << 5) & 0xffffffff) | (sum >>> 27));
  sum = (D + (B ^ (C & (A ^ B))) + X[2] + 0xfcefa3f8) & 0xffffffff;
  D = A + (((sum << 9) & 0xffffffff) | (sum >>> 23));
  sum = (C + (A ^ (B & (D ^ A))) + X[7] + 0x676f02d9) & 0xffffffff;
  C = D + (((sum << 14) & 0xffffffff) | (sum >>> 18));
  sum = (B + (D ^ (A & (C ^ D))) + X[12] + 0x8d2a4c8a) & 0xffffffff;
  B = C + (((sum << 20) & 0xffffffff) | (sum >>> 12));
  sum = (A + (B ^ C ^ D) + X[5] + 0xfffa3942) & 0xffffffff;
  A = B + (((sum << 4) & 0xffffffff) | (sum >>> 28));
  sum = (D + (A ^ B ^ C) + X[8] + 0x8771f681) & 0xffffffff;
  D = A + (((sum << 11) & 0xffffffff) | (sum >>> 21));
  sum = (C + (D ^ A ^ B) + X[11] + 0x6d9d6122) & 0xffffffff;
  C = D + (((sum << 16) & 0xffffffff) | (sum >>> 16));
  sum = (B + (C ^ D ^ A) + X[14] + 0xfde5380c) & 0xffffffff;
  B = C + (((sum << 23) & 0xffffffff) | (sum >>> 9));
  sum = (A + (B ^ C ^ D) + X[1] + 0xa4beea44) & 0xffffffff;
  A = B + (((sum << 4) & 0xffffffff) | (sum >>> 28));
  sum = (D + (A ^ B ^ C) + X[4] + 0x4bdecfa9) & 0xffffffff;
  D = A + (((sum << 11) & 0xffffffff) | (sum >>> 21));
  sum = (C + (D ^ A ^ B) + X[7] + 0xf6bb4b60) & 0xffffffff;
  C = D + (((sum << 16) & 0xffffffff) | (sum >>> 16));
  sum = (B + (C ^ D ^ A) + X[10] + 0xbebfbc70) & 0xffffffff;
  B = C + (((sum << 23) & 0xffffffff) | (sum >>> 9));
  sum = (A + (B ^ C ^ D) + X[13] + 0x289b7ec6) & 0xffffffff;
  A = B + (((sum << 4) & 0xffffffff) | (sum >>> 28));
  sum = (D + (A ^ B ^ C) + X[0] + 0xeaa127fa) & 0xffffffff;
  D = A + (((sum << 11) & 0xffffffff) | (sum >>> 21));
  sum = (C + (D ^ A ^ B) + X[3] + 0xd4ef3085) & 0xffffffff;
  C = D + (((sum << 16) & 0xffffffff) | (sum >>> 16));
  sum = (B + (C ^ D ^ A) + X[6] + 0x04881d05) & 0xffffffff;
  B = C + (((sum << 23) & 0xffffffff) | (sum >>> 9));
  sum = (A + (B ^ C ^ D) + X[9] + 0xd9d4d039) & 0xffffffff;
  A = B + (((sum << 4) & 0xffffffff) | (sum >>> 28));
  sum = (D + (A ^ B ^ C) + X[12] + 0xe6db99e5) & 0xffffffff;
  D = A + (((sum << 11) & 0xffffffff) | (sum >>> 21));
  sum = (C + (D ^ A ^ B) + X[15] + 0x1fa27cf8) & 0xffffffff;
  C = D + (((sum << 16) & 0xffffffff) | (sum >>> 16));
  sum = (B + (C ^ D ^ A) + X[2] + 0xc4ac5665) & 0xffffffff;
  B = C + (((sum << 23) & 0xffffffff) | (sum >>> 9));
  sum = (A + (C ^ (B | (~D))) + X[0] + 0xf4292244) & 0xffffffff;
  A = B + (((sum << 6) & 0xffffffff) | (sum >>> 26));
  sum = (D + (B ^ (A | (~C))) + X[7] + 0x432aff97) & 0xffffffff;
  D = A + (((sum << 10) & 0xffffffff) | (sum >>> 22));
  sum = (C + (A ^ (D | (~B))) + X[14] + 0xab9423a7) & 0xffffffff;
  C = D + (((sum << 15) & 0xffffffff) | (sum >>> 17));
  sum = (B + (D ^ (C | (~A))) + X[5] + 0xfc93a039) & 0xffffffff;
  B = C + (((sum << 21) & 0xffffffff) | (sum >>> 11));
  sum = (A + (C ^ (B | (~D))) + X[12] + 0x655b59c3) & 0xffffffff;
  A = B + (((sum << 6) & 0xffffffff) | (sum >>> 26));
  sum = (D + (B ^ (A | (~C))) + X[3] + 0x8f0ccc92) & 0xffffffff;
  D = A + (((sum << 10) & 0xffffffff) | (sum >>> 22));
  sum = (C + (A ^ (D | (~B))) + X[10] + 0xffeff47d) & 0xffffffff;
  C = D + (((sum << 15) & 0xffffffff) | (sum >>> 17));
  sum = (B + (D ^ (C | (~A))) + X[1] + 0x85845dd1) & 0xffffffff;
  B = C + (((sum << 21) & 0xffffffff) | (sum >>> 11));
  sum = (A + (C ^ (B | (~D))) + X[8] + 0x6fa87e4f) & 0xffffffff;
  A = B + (((sum << 6) & 0xffffffff) | (sum >>> 26));
  sum = (D + (B ^ (A | (~C))) + X[15] + 0xfe2ce6e0) & 0xffffffff;
  D = A + (((sum << 10) & 0xffffffff) | (sum >>> 22));
  sum = (C + (A ^ (D | (~B))) + X[6] + 0xa3014314) & 0xffffffff;
  C = D + (((sum << 15) & 0xffffffff) | (sum >>> 17));
  sum = (B + (D ^ (C | (~A))) + X[13] + 0x4e0811a1) & 0xffffffff;
  B = C + (((sum << 21) & 0xffffffff) | (sum >>> 11));
  sum = (A + (C ^ (B | (~D))) + X[4] + 0xf7537e82) & 0xffffffff;
  A = B + (((sum << 6) & 0xffffffff) | (sum >>> 26));
  sum = (D + (B ^ (A | (~C))) + X[11] + 0xbd3af235) & 0xffffffff;
  D = A + (((sum << 10) & 0xffffffff) | (sum >>> 22));
  sum = (C + (A ^ (D | (~B))) + X[2] + 0x2ad7d2bb) & 0xffffffff;
  C = D + (((sum << 15) & 0xffffffff) | (sum >>> 17));
  sum = (B + (D ^ (C | (~A))) + X[9] + 0xeb86d391) & 0xffffffff;
  B = C + (((sum << 21) & 0xffffffff) | (sum >>> 11));

  this.chain_[0] = (this.chain_[0] + A) & 0xffffffff;
  this.chain_[1] = (this.chain_[1] + B) & 0xffffffff;
  this.chain_[2] = (this.chain_[2] + C) & 0xffffffff;
  this.chain_[3] = (this.chain_[3] + D) & 0xffffffff;
};


/** @override */
goog.crypt.Md5.prototype.update = function(bytes, opt_length) {
  if (!goog.isDef(opt_length)) {
    opt_length = bytes.length;
  }
  var lengthMinusBlock = opt_length - this.blockSize;

  // Copy some object properties to local variables in order to save on access
  // time from inside the loop (~10% speedup was observed on Chrome 11).
  var block = this.block_;
  var blockLength = this.blockLength_;
  var i = 0;

  // The outer while loop should execute at most twice.
  while (i < opt_length) {
    // When we have no data in the block to top up, we can directly process the
    // input buffer (assuming it contains sufficient data). This gives ~30%
    // speedup on Chrome 14 and ~70% speedup on Firefox 6.0, but requires that
    // the data is provided in large chunks (or in multiples of 64 bytes).
    if (blockLength == 0) {
      while (i <= lengthMinusBlock) {
        this.compress_(bytes, i);
        i += this.blockSize;
      }
    }

    if (goog.isString(bytes)) {
      while (i < opt_length) {
        block[blockLength++] = bytes.charCodeAt(i++);
        if (blockLength == this.blockSize) {
          this.compress_(block);
          blockLength = 0;
          // Jump to the outer loop so we use the full-block optimization.
          break;
        }
      }
    } else {
      while (i < opt_length) {
        block[blockLength++] = bytes[i++];
        if (blockLength == this.blockSize) {
          this.compress_(block);
          blockLength = 0;
          // Jump to the outer loop so we use the full-block optimization.
          break;
        }
      }
    }
  }

  this.blockLength_ = blockLength;
  this.totalLength_ += opt_length;
};


/** @override */
goog.crypt.Md5.prototype.digest = function() {
  // This must accommodate at least 1 padding byte (0x80), 8 bytes of
  // total bitlength, and must end at a 64-byte boundary.
  var pad = new Array(
      (this.blockLength_ < 56 ? this.blockSize : this.blockSize * 2) -
      this.blockLength_);

  // Add padding: 0x80 0x00*
  pad[0] = 0x80;
  for (var i = 1; i < pad.length - 8; ++i) {
    pad[i] = 0;
  }
  // Add the total number of bits, little endian 64-bit integer.
  var totalBits = this.totalLength_ * 8;
  for (var i = pad.length - 8; i < pad.length; ++i) {
    pad[i] = totalBits & 0xff;
    totalBits /= 0x100;  // Don't use bit-shifting here!
  }
  this.update(pad);

  var digest = new Array(16);
  var n = 0;
  for (var i = 0; i < 4; ++i) {
    for (var j = 0; j < 32; j += 8) {
      digest[n++] = (this.chain_[i] >>> j) & 0xff;
    }
  }
  return digest;
};

goog.provide('ol.style.Stroke');

goog.require('goog.crypt');
goog.require('goog.crypt.Md5');
goog.require('ol.color');


/**
 * @classdesc
 * Set stroke style for vector features.
 * Note that the defaults given are the Canvas defaults, which will be used if
 * option is not defined. The `get` functions return whatever was entered in
 * the options; they will not return the default.
 *
 * @constructor
 * @param {olx.style.StrokeOptions=} opt_options Options.
 * @api
 */
ol.style.Stroke = function(opt_options) {

  var options = opt_options || {};

  /**
   * @private
   * @type {ol.Color|string}
   */
  this.color_ = options.color !== undefined ? options.color : null;

  /**
   * @private
   * @type {string|undefined}
   */
  this.lineCap_ = options.lineCap;

  /**
   * @private
   * @type {Array.<number>}
   */
  this.lineDash_ = options.lineDash !== undefined ? options.lineDash : null;

  /**
   * @private
   * @type {string|undefined}
   */
  this.lineJoin_ = options.lineJoin;

  /**
   * @private
   * @type {number|undefined}
   */
  this.miterLimit_ = options.miterLimit;

  /**
   * @private
   * @type {number|undefined}
   */
  this.width_ = options.width;

  /**
   * @private
   * @type {string|undefined}
   */
  this.checksum_ = undefined;
};


/**
 * Get the stroke color.
 * @return {ol.Color|string} Color.
 * @api
 */
ol.style.Stroke.prototype.getColor = function() {
  return this.color_;
};


/**
 * Get the line cap type for the stroke.
 * @return {string|undefined} Line cap.
 * @api
 */
ol.style.Stroke.prototype.getLineCap = function() {
  return this.lineCap_;
};


/**
 * Get the line dash style for the stroke.
 * @return {Array.<number>} Line dash.
 * @api
 */
ol.style.Stroke.prototype.getLineDash = function() {
  return this.lineDash_;
};


/**
 * Get the line join type for the stroke.
 * @return {string|undefined} Line join.
 * @api
 */
ol.style.Stroke.prototype.getLineJoin = function() {
  return this.lineJoin_;
};


/**
 * Get the miter limit for the stroke.
 * @return {number|undefined} Miter limit.
 * @api
 */
ol.style.Stroke.prototype.getMiterLimit = function() {
  return this.miterLimit_;
};


/**
 * Get the stroke width.
 * @return {number|undefined} Width.
 * @api
 */
ol.style.Stroke.prototype.getWidth = function() {
  return this.width_;
};


/**
 * Set the color.
 *
 * @param {ol.Color|string} color Color.
 * @api
 */
ol.style.Stroke.prototype.setColor = function(color) {
  this.color_ = color;
  this.checksum_ = undefined;
};


/**
 * Set the line cap.
 *
 * @param {string|undefined} lineCap Line cap.
 * @api
 */
ol.style.Stroke.prototype.setLineCap = function(lineCap) {
  this.lineCap_ = lineCap;
  this.checksum_ = undefined;
};


/**
 * Set the line dash.
 *
 * Please note that Internet Explorer 10 and lower [do not support][mdn] the
 * `setLineDash` method on the `CanvasRenderingContext2D` and therefore this
 * property will have no visual effect in these browsers.
 *
 * [mdn]: https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/setLineDash#Browser_compatibility
 *
 * @param {Array.<number>} lineDash Line dash.
 * @api
 */
ol.style.Stroke.prototype.setLineDash = function(lineDash) {
  this.lineDash_ = lineDash;
  this.checksum_ = undefined;
};


/**
 * Set the line join.
 *
 * @param {string|undefined} lineJoin Line join.
 * @api
 */
ol.style.Stroke.prototype.setLineJoin = function(lineJoin) {
  this.lineJoin_ = lineJoin;
  this.checksum_ = undefined;
};


/**
 * Set the miter limit.
 *
 * @param {number|undefined} miterLimit Miter limit.
 * @api
 */
ol.style.Stroke.prototype.setMiterLimit = function(miterLimit) {
  this.miterLimit_ = miterLimit;
  this.checksum_ = undefined;
};


/**
 * Set the width.
 *
 * @param {number|undefined} width Width.
 * @api
 */
ol.style.Stroke.prototype.setWidth = function(width) {
  this.width_ = width;
  this.checksum_ = undefined;
};


/**
 * @return {string} The checksum.
 */
ol.style.Stroke.prototype.getChecksum = function() {
  if (this.checksum_ === undefined) {
    var raw = 's' +
        (this.color_ ?
            ol.color.asString(this.color_) : '-') + ',' +
        (this.lineCap_ !== undefined ?
            this.lineCap_.toString() : '-') + ',' +
        (this.lineDash_ ?
            this.lineDash_.toString() : '-') + ',' +
        (this.lineJoin_ !== undefined ?
            this.lineJoin_ : '-') + ',' +
        (this.miterLimit_ !== undefined ?
            this.miterLimit_.toString() : '-') + ',' +
        (this.width_ !== undefined ?
            this.width_.toString() : '-');

    var md5 = new goog.crypt.Md5();
    md5.update(raw);
    this.checksum_ = goog.crypt.byteArrayToString(md5.digest());
  }

  return this.checksum_;
};

goog.provide('ol.style.Style');

goog.require('ol.asserts');
goog.require('ol.geom.GeometryType');
goog.require('ol.style.Circle');
goog.require('ol.style.Fill');
goog.require('ol.style.Stroke');


/**
 * @classdesc
 * Container for vector feature rendering styles. Any changes made to the style
 * or its children through `set*()` methods will not take effect until the
 * feature or layer that uses the style is re-rendered.
 *
 * @constructor
 * @struct
 * @param {olx.style.StyleOptions=} opt_options Style options.
 * @api
 */
ol.style.Style = function(opt_options) {

  var options = opt_options || {};

  /**
   * @private
   * @type {string|ol.geom.Geometry|ol.StyleGeometryFunction}
   */
  this.geometry_ = null;

  /**
   * @private
   * @type {!ol.StyleGeometryFunction}
   */
  this.geometryFunction_ = ol.style.Style.defaultGeometryFunction;

  if (options.geometry !== undefined) {
    this.setGeometry(options.geometry);
  }

  /**
   * @private
   * @type {ol.style.Fill}
   */
  this.fill_ = options.fill !== undefined ? options.fill : null;

  /**
   * @private
   * @type {ol.style.Image}
   */
  this.image_ = options.image !== undefined ? options.image : null;

  /**
   * @private
   * @type {ol.style.Stroke}
   */
  this.stroke_ = options.stroke !== undefined ? options.stroke : null;

  /**
   * @private
   * @type {ol.style.Text}
   */
  this.text_ = options.text !== undefined ? options.text : null;

  /**
   * @private
   * @type {number|undefined}
   */
  this.zIndex_ = options.zIndex;

};


/**
 * Get the geometry to be rendered.
 * @return {string|ol.geom.Geometry|ol.StyleGeometryFunction}
 * Feature property or geometry or function that returns the geometry that will
 * be rendered with this style.
 * @api
 */
ol.style.Style.prototype.getGeometry = function() {
  return this.geometry_;
};


/**
 * Get the function used to generate a geometry for rendering.
 * @return {!ol.StyleGeometryFunction} Function that is called with a feature
 * and returns the geometry to render instead of the feature's geometry.
 * @api
 */
ol.style.Style.prototype.getGeometryFunction = function() {
  return this.geometryFunction_;
};


/**
 * Get the fill style.
 * @return {ol.style.Fill} Fill style.
 * @api
 */
ol.style.Style.prototype.getFill = function() {
  return this.fill_;
};


/**
 * Get the image style.
 * @return {ol.style.Image} Image style.
 * @api
 */
ol.style.Style.prototype.getImage = function() {
  return this.image_;
};


/**
 * Get the stroke style.
 * @return {ol.style.Stroke} Stroke style.
 * @api
 */
ol.style.Style.prototype.getStroke = function() {
  return this.stroke_;
};


/**
 * Get the text style.
 * @return {ol.style.Text} Text style.
 * @api
 */
ol.style.Style.prototype.getText = function() {
  return this.text_;
};


/**
 * Get the z-index for the style.
 * @return {number|undefined} ZIndex.
 * @api
 */
ol.style.Style.prototype.getZIndex = function() {
  return this.zIndex_;
};


/**
 * Set a geometry that is rendered instead of the feature's geometry.
 *
 * @param {string|ol.geom.Geometry|ol.StyleGeometryFunction} geometry
 *     Feature property or geometry or function returning a geometry to render
 *     for this style.
 * @api
 */
ol.style.Style.prototype.setGeometry = function(geometry) {
  if (typeof geometry === 'function') {
    this.geometryFunction_ = geometry;
  } else if (typeof geometry === 'string') {
    this.geometryFunction_ = function(feature) {
      return /** @type {ol.geom.Geometry} */ (feature.get(geometry));
    };
  } else if (!geometry) {
    this.geometryFunction_ = ol.style.Style.defaultGeometryFunction;
  } else if (geometry !== undefined) {
    this.geometryFunction_ = function() {
      return /** @type {ol.geom.Geometry} */ (geometry);
    };
  }
  this.geometry_ = geometry;
};


/**
 * Set the z-index.
 *
 * @param {number|undefined} zIndex ZIndex.
 * @api
 */
ol.style.Style.prototype.setZIndex = function(zIndex) {
  this.zIndex_ = zIndex;
};


/**
 * Convert the provided object into a style function.  Functions passed through
 * unchanged.  Arrays of ol.style.Style or single style objects wrapped in a
 * new style function.
 * @param {ol.StyleFunction|Array.<ol.style.Style>|ol.style.Style} obj
 *     A style function, a single style, or an array of styles.
 * @return {ol.StyleFunction} A style function.
 */
ol.style.Style.createFunction = function(obj) {
  var styleFunction;

  if (typeof obj === 'function') {
    styleFunction = obj;
  } else {
    /**
     * @type {Array.<ol.style.Style>}
     */
    var styles;
    if (Array.isArray(obj)) {
      styles = obj;
    } else {
      ol.asserts.assert(obj instanceof ol.style.Style,
          41); // Expected an `ol.style.Style` or an array of `ol.style.Style`
      styles = [obj];
    }
    styleFunction = function() {
      return styles;
    };
  }
  return styleFunction;
};


/**
 * @type {Array.<ol.style.Style>}
 * @private
 */
ol.style.Style.default_ = null;


/**
 * @param {ol.Feature|ol.render.Feature} feature Feature.
 * @param {number} resolution Resolution.
 * @return {Array.<ol.style.Style>} Style.
 */
ol.style.Style.defaultFunction = function(feature, resolution) {
  // We don't use an immediately-invoked function
  // and a closure so we don't get an error at script evaluation time in
  // browsers that do not support Canvas. (ol.style.Circle does
  // canvas.getContext('2d') at construction time, which will cause an.error
  // in such browsers.)
  if (!ol.style.Style.default_) {
    var fill = new ol.style.Fill({
      color: 'rgba(255,255,255,0.4)'
    });
    var stroke = new ol.style.Stroke({
      color: '#3399CC',
      width: 1.25
    });
    ol.style.Style.default_ = [
      new ol.style.Style({
        image: new ol.style.Circle({
          fill: fill,
          stroke: stroke,
          radius: 5
        }),
        fill: fill,
        stroke: stroke
      })
    ];
  }
  return ol.style.Style.default_;
};


/**
 * Default styles for editing features.
 * @return {Object.<ol.geom.GeometryType, Array.<ol.style.Style>>} Styles
 */
ol.style.Style.createDefaultEditing = function() {
  /** @type {Object.<ol.geom.GeometryType, Array.<ol.style.Style>>} */
  var styles = {};
  var white = [255, 255, 255, 1];
  var blue = [0, 153, 255, 1];
  var width = 3;
  styles[ol.geom.GeometryType.POLYGON] = [
    new ol.style.Style({
      fill: new ol.style.Fill({
        color: [255, 255, 255, 0.5]
      })
    })
  ];
  styles[ol.geom.GeometryType.MULTI_POLYGON] =
      styles[ol.geom.GeometryType.POLYGON];

  styles[ol.geom.GeometryType.LINE_STRING] = [
    new ol.style.Style({
      stroke: new ol.style.Stroke({
        color: white,
        width: width + 2
      })
    }),
    new ol.style.Style({
      stroke: new ol.style.Stroke({
        color: blue,
        width: width
      })
    })
  ];
  styles[ol.geom.GeometryType.MULTI_LINE_STRING] =
      styles[ol.geom.GeometryType.LINE_STRING];

  styles[ol.geom.GeometryType.CIRCLE] =
      styles[ol.geom.GeometryType.POLYGON].concat(
          styles[ol.geom.GeometryType.LINE_STRING]
      );


  styles[ol.geom.GeometryType.POINT] = [
    new ol.style.Style({
      image: new ol.style.Circle({
        radius: width * 2,
        fill: new ol.style.Fill({
          color: blue
        }),
        stroke: new ol.style.Stroke({
          color: white,
          width: width / 2
        })
      }),
      zIndex: Infinity
    })
  ];
  styles[ol.geom.GeometryType.MULTI_POINT] =
      styles[ol.geom.GeometryType.POINT];

  styles[ol.geom.GeometryType.GEOMETRY_COLLECTION] =
      styles[ol.geom.GeometryType.POLYGON].concat(
          styles[ol.geom.GeometryType.LINE_STRING],
          styles[ol.geom.GeometryType.POINT]
      );

  return styles;
};


/**
 * Function that is called with a feature and returns its default geometry.
 * @param {ol.Feature|ol.render.Feature} feature Feature to get the geometry
 *     for.
 * @return {ol.geom.Geometry|ol.render.Feature|undefined} Geometry to render.
 */
ol.style.Style.defaultGeometryFunction = function(feature) {
  return feature.getGeometry();
};

goog.provide('ol.layer.Vector');

goog.require('ol');
goog.require('ol.layer.Layer');
goog.require('ol.obj');
goog.require('ol.style.Style');


/**
 * @enum {string}
 */
ol.layer.VectorProperty = {
  RENDER_ORDER: 'renderOrder'
};


/**
 * @classdesc
 * Vector data that is rendered client-side.
 * Note that any property set in the options is set as a {@link ol.Object}
 * property on the layer object; for example, setting `title: 'My Title'` in the
 * options means that `title` is observable, and has get/set accessors.
 *
 * @constructor
 * @extends {ol.layer.Layer}
 * @fires ol.render.Event
 * @param {olx.layer.VectorOptions=} opt_options Options.
 * @api stable
 */
ol.layer.Vector = function(opt_options) {

  var options = opt_options ?
      opt_options : /** @type {olx.layer.VectorOptions} */ ({});

  goog.DEBUG && console.assert(
      options.renderOrder === undefined || !options.renderOrder ||
      typeof options.renderOrder === 'function',
      'renderOrder must be a comparator function');

  var baseOptions = ol.obj.assign({}, options);

  delete baseOptions.style;
  delete baseOptions.renderBuffer;
  delete baseOptions.updateWhileAnimating;
  delete baseOptions.updateWhileInteracting;
  ol.layer.Layer.call(this, /** @type {olx.layer.LayerOptions} */ (baseOptions));

  /**
   * @type {number}
   * @private
   */
  this.renderBuffer_ = options.renderBuffer !== undefined ?
      options.renderBuffer : 100;

  /**
   * User provided style.
   * @type {ol.style.Style|Array.<ol.style.Style>|ol.StyleFunction}
   * @private
   */
  this.style_ = null;

  /**
   * Style function for use within the library.
   * @type {ol.StyleFunction|undefined}
   * @private
   */
  this.styleFunction_ = undefined;

  this.setStyle(options.style);

  /**
   * @type {boolean}
   * @private
   */
  this.updateWhileAnimating_ = options.updateWhileAnimating !== undefined ?
      options.updateWhileAnimating : false;

  /**
   * @type {boolean}
   * @private
   */
  this.updateWhileInteracting_ = options.updateWhileInteracting !== undefined ?
      options.updateWhileInteracting : false;

};
ol.inherits(ol.layer.Vector, ol.layer.Layer);


/**
 * @return {number|undefined} Render buffer.
 */
ol.layer.Vector.prototype.getRenderBuffer = function() {
  return this.renderBuffer_;
};


/**
 * @return {function(ol.Feature, ol.Feature): number|null|undefined} Render
 *     order.
 */
ol.layer.Vector.prototype.getRenderOrder = function() {
  return /** @type {function(ol.Feature, ol.Feature):number|null|undefined} */ (
      this.get(ol.layer.VectorProperty.RENDER_ORDER));
};


/**
 * Return the associated {@link ol.source.Vector vectorsource} of the layer.
 * @function
 * @return {ol.source.Vector} Source.
 * @api stable
 */
ol.layer.Vector.prototype.getSource;


/**
 * Get the style for features.  This returns whatever was passed to the `style`
 * option at construction or to the `setStyle` method.
 * @return {ol.style.Style|Array.<ol.style.Style>|ol.StyleFunction}
 *     Layer style.
 * @api stable
 */
ol.layer.Vector.prototype.getStyle = function() {
  return this.style_;
};


/**
 * Get the style function.
 * @return {ol.StyleFunction|undefined} Layer style function.
 * @api stable
 */
ol.layer.Vector.prototype.getStyleFunction = function() {
  return this.styleFunction_;
};


/**
 * @return {boolean} Whether the rendered layer should be updated while
 *     animating.
 */
ol.layer.Vector.prototype.getUpdateWhileAnimating = function() {
  return this.updateWhileAnimating_;
};


/**
 * @return {boolean} Whether the rendered layer should be updated while
 *     interacting.
 */
ol.layer.Vector.prototype.getUpdateWhileInteracting = function() {
  return this.updateWhileInteracting_;
};


/**
 * @param {function(ol.Feature, ol.Feature):number|null|undefined} renderOrder
 *     Render order.
 */
ol.layer.Vector.prototype.setRenderOrder = function(renderOrder) {
  goog.DEBUG && console.assert(
      renderOrder === undefined || !renderOrder ||
      typeof renderOrder === 'function',
      'renderOrder must be a comparator function');
  this.set(ol.layer.VectorProperty.RENDER_ORDER, renderOrder);
};


/**
 * Set the style for features.  This can be a single style object, an array
 * of styles, or a function that takes a feature and resolution and returns
 * an array of styles. If it is `undefined` the default style is used. If
 * it is `null` the layer has no style (a `null` style), so only features
 * that have their own styles will be rendered in the layer. See
 * {@link ol.style} for information on the default style.
 * @param {ol.style.Style|Array.<ol.style.Style>|ol.StyleFunction|null|undefined}
 *     style Layer style.
 * @api stable
 */
ol.layer.Vector.prototype.setStyle = function(style) {
  this.style_ = style !== undefined ? style : ol.style.Style.defaultFunction;
  this.styleFunction_ = style === null ?
      undefined : ol.style.Style.createFunction(this.style_);
  this.changed();
};

goog.provide('ol.layer.VectorTile');

goog.require('ol');
goog.require('ol.asserts');
goog.require('ol.layer.Vector');
goog.require('ol.obj');


/**
 * @enum {string}
 */
ol.layer.VectorTileProperty = {
  PRELOAD: 'preload',
  USE_INTERIM_TILES_ON_ERROR: 'useInterimTilesOnError'
};


/**
 * @enum {string}
 * Render mode for vector tiles:
 *  * `'image'`: Vector tiles are rendered as images. Great performance, but
 *    point symbols and texts are always rotated with the view and pixels are
 *    scaled during zoom animations.
 *  * `'hybrid'`: Polygon and line elements are rendered as images, so pixels
 *    are scaled during zoom animations. Point symbols and texts are accurately
 *    rendered as vectors and can stay upright on rotated views.
 *  * `'vector'`: Vector tiles are rendered as vectors. Most accurate rendering
 *    even during animations, but slower performance than the other options.
 * @api
 */
ol.layer.VectorTileRenderType = {
  IMAGE: 'image',
  HYBRID: 'hybrid',
  VECTOR: 'vector'
};


/**
 * @classdesc
 * Layer for vector tile data that is rendered client-side.
 * Note that any property set in the options is set as a {@link ol.Object}
 * property on the layer object; for example, setting `title: 'My Title'` in the
 * options means that `title` is observable, and has get/set accessors.
 *
 * @constructor
 * @extends {ol.layer.Vector}
 * @param {olx.layer.VectorTileOptions=} opt_options Options.
 * @api
 */
ol.layer.VectorTile = function(opt_options) {
  var options = opt_options ? opt_options : {};

  var baseOptions = ol.obj.assign({}, options);

  delete baseOptions.preload;
  delete baseOptions.useInterimTilesOnError;
  ol.layer.Vector.call(this,  /** @type {olx.layer.VectorOptions} */ (baseOptions));

  this.setPreload(options.preload ? options.preload : 0);
  this.setUseInterimTilesOnError(options.useInterimTilesOnError ?
      options.useInterimTilesOnError : true);

  ol.asserts.assert(options.renderMode == undefined ||
      options.renderMode == ol.layer.VectorTileRenderType.IMAGE ||
      options.renderMode == ol.layer.VectorTileRenderType.HYBRID ||
      options.renderMode == ol.layer.VectorTileRenderType.VECTOR,
      28); // `renderMode` must be `'image'`, `'hybrid'` or `'vector'`

  /**
   * @private
   * @type {ol.layer.VectorTileRenderType|string}
   */
  this.renderMode_ = options.renderMode || ol.layer.VectorTileRenderType.HYBRID;

};
ol.inherits(ol.layer.VectorTile, ol.layer.Vector);


/**
 * Return the level as number to which we will preload tiles up to.
 * @return {number} The level to preload tiles up to.
 * @observable
 * @api
 */
ol.layer.VectorTile.prototype.getPreload = function() {
  return /** @type {number} */ (this.get(ol.layer.VectorTileProperty.PRELOAD));
};


/**
 * @return {ol.layer.VectorTileRenderType|string} The render mode.
 */
ol.layer.VectorTile.prototype.getRenderMode = function() {
  return this.renderMode_;
};


/**
 * Whether we use interim tiles on error.
 * @return {boolean} Use interim tiles on error.
 * @observable
 * @api
 */
ol.layer.VectorTile.prototype.getUseInterimTilesOnError = function() {
  return /** @type {boolean} */ (
      this.get(ol.layer.VectorTileProperty.USE_INTERIM_TILES_ON_ERROR));
};


/**
 * Set the level as number to which we will preload tiles up to.
 * @param {number} preload The level to preload tiles up to.
 * @observable
 * @api
 */
ol.layer.VectorTile.prototype.setPreload = function(preload) {
  this.set(ol.layer.TileProperty.PRELOAD, preload);
};


/**
 * Set whether we use interim tiles on error.
 * @param {boolean} useInterimTilesOnError Use interim tiles on error.
 * @observable
 * @api
 */
ol.layer.VectorTile.prototype.setUseInterimTilesOnError = function(useInterimTilesOnError) {
  this.set(
      ol.layer.TileProperty.USE_INTERIM_TILES_ON_ERROR, useInterimTilesOnError);
};

goog.provide('ol.render.VectorContext');


/**
 * Context for drawing geometries.  A vector context is available on render
 * events and does not need to be constructed directly.
 * @constructor
 * @struct
 * @api
 */
ol.render.VectorContext = function() {
};


/**
 * Render a geometry.
 *
 * @abstract
 * @param {ol.geom.Geometry} geometry The geometry to render.
 */
ol.render.VectorContext.prototype.drawGeometry = function(geometry) {};


/**
 * Set the rendering style.
 *
 * @abstract
 * @param {ol.style.Style} style The rendering style.
 */
ol.render.VectorContext.prototype.setStyle = function(style) {};


/**
 * @abstract
 * @param {ol.geom.Circle} circleGeometry Circle geometry.
 * @param {ol.Feature} feature Feature,
 */
ol.render.VectorContext.prototype.drawCircle = function(circleGeometry, feature) {};


/**
 * @abstract
 * @param {ol.Feature} feature Feature.
 * @param {ol.style.Style} style Style.
 */
ol.render.VectorContext.prototype.drawFeature = function(feature, style) {};


/**
 * @abstract
 * @param {ol.geom.GeometryCollection} geometryCollectionGeometry Geometry
 *     collection.
 * @param {ol.Feature} feature Feature.
 */
ol.render.VectorContext.prototype.drawGeometryCollection = function(geometryCollectionGeometry, feature) {};


/**
 * @abstract
 * @param {ol.geom.LineString|ol.render.Feature} lineStringGeometry Line
 *     string geometry.
 * @param {ol.Feature|ol.render.Feature} feature Feature.
 */
ol.render.VectorContext.prototype.drawLineString = function(lineStringGeometry, feature) {};


/**
 * @abstract
 * @param {ol.geom.MultiLineString|ol.render.Feature} multiLineStringGeometry
 *     MultiLineString geometry.
 * @param {ol.Feature|ol.render.Feature} feature Feature.
 */
ol.render.VectorContext.prototype.drawMultiLineString = function(multiLineStringGeometry, feature) {};


/**
 * @abstract
 * @param {ol.geom.MultiPoint|ol.render.Feature} multiPointGeometry MultiPoint
 *     geometry.
 * @param {ol.Feature|ol.render.Feature} feature Feature.
 */
ol.render.VectorContext.prototype.drawMultiPoint = function(multiPointGeometry, feature) {};


/**
 * @abstract
 * @param {ol.geom.MultiPolygon} multiPolygonGeometry MultiPolygon geometry.
 * @param {ol.Feature} feature Feature.
 */
ol.render.VectorContext.prototype.drawMultiPolygon = function(multiPolygonGeometry, feature) {};


/**
 * @abstract
 * @param {ol.geom.Point|ol.render.Feature} pointGeometry Point geometry.
 * @param {ol.Feature|ol.render.Feature} feature Feature.
 */
ol.render.VectorContext.prototype.drawPoint = function(pointGeometry, feature) {};


/**
 * @abstract
 * @param {ol.geom.Polygon|ol.render.Feature} polygonGeometry Polygon
 *     geometry.
 * @param {ol.Feature|ol.render.Feature} feature Feature.
 */
ol.render.VectorContext.prototype.drawPolygon = function(polygonGeometry, feature) {};


/**
 * @abstract
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @param {ol.geom.Geometry|ol.render.Feature} geometry Geometry.
 * @param {ol.Feature|ol.render.Feature} feature Feature.
 */
ol.render.VectorContext.prototype.drawText = function(flatCoordinates, offset, end, stride, geometry, feature) {};


/**
 * @abstract
 * @param {ol.style.Fill} fillStyle Fill style.
 * @param {ol.style.Stroke} strokeStyle Stroke style.
 */
ol.render.VectorContext.prototype.setFillStrokeStyle = function(fillStyle, strokeStyle) {};


/**
 * @abstract
 * @param {ol.style.Image} imageStyle Image style.
 */
ol.render.VectorContext.prototype.setImageStyle = function(imageStyle) {};


/**
 * @abstract
 * @param {ol.style.Text} textStyle Text style.
 */
ol.render.VectorContext.prototype.setTextStyle = function(textStyle) {};

// FIXME test, especially polygons with holes and multipolygons
// FIXME need to handle large thick features (where pixel size matters)
// FIXME add offset and end to ol.geom.flat.transform.transform2D?

goog.provide('ol.render.canvas.Immediate');

goog.require('ol');
goog.require('ol.array');
goog.require('ol.color');
goog.require('ol.colorlike');
goog.require('ol.extent');
goog.require('ol.geom.GeometryType');
goog.require('ol.geom.SimpleGeometry');
goog.require('ol.geom.flat.transform');
goog.require('ol.has');
goog.require('ol.render.VectorContext');
goog.require('ol.render.canvas');
goog.require('ol.transform');


/**
 * @classdesc
 * A concrete subclass of {@link ol.render.VectorContext} that implements
 * direct rendering of features and geometries to an HTML5 Canvas context.
 * Instances of this class are created internally by the library and
 * provided to application code as vectorContext member of the
 * {@link ol.render.Event} object associated with postcompose, precompose and
 * render events emitted by layers and maps.
 *
 * @constructor
 * @extends {ol.render.VectorContext}
 * @param {CanvasRenderingContext2D} context Context.
 * @param {number} pixelRatio Pixel ratio.
 * @param {ol.Extent} extent Extent.
 * @param {ol.Transform} transform Transform.
 * @param {number} viewRotation View rotation.
 * @struct
 */
ol.render.canvas.Immediate = function(context, pixelRatio, extent, transform, viewRotation) {
  ol.render.VectorContext.call(this);

  /**
   * @private
   * @type {CanvasRenderingContext2D}
   */
  this.context_ = context;

  /**
   * @private
   * @type {number}
   */
  this.pixelRatio_ = pixelRatio;

  /**
   * @private
   * @type {ol.Extent}
   */
  this.extent_ = extent;

  /**
   * @private
   * @type {ol.Transform}
   */
  this.transform_ = transform;

  /**
   * @private
   * @type {number}
   */
  this.viewRotation_ = viewRotation;

  /**
   * @private
   * @type {?ol.CanvasFillState}
   */
  this.contextFillState_ = null;

  /**
   * @private
   * @type {?ol.CanvasStrokeState}
   */
  this.contextStrokeState_ = null;

  /**
   * @private
   * @type {?ol.CanvasTextState}
   */
  this.contextTextState_ = null;

  /**
   * @private
   * @type {?ol.CanvasFillState}
   */
  this.fillState_ = null;

  /**
   * @private
   * @type {?ol.CanvasStrokeState}
   */
  this.strokeState_ = null;

  /**
   * @private
   * @type {HTMLCanvasElement|HTMLVideoElement|Image}
   */
  this.image_ = null;

  /**
   * @private
   * @type {number}
   */
  this.imageAnchorX_ = 0;

  /**
   * @private
   * @type {number}
   */
  this.imageAnchorY_ = 0;

  /**
   * @private
   * @type {number}
   */
  this.imageHeight_ = 0;

  /**
   * @private
   * @type {number}
   */
  this.imageOpacity_ = 0;

  /**
   * @private
   * @type {number}
   */
  this.imageOriginX_ = 0;

  /**
   * @private
   * @type {number}
   */
  this.imageOriginY_ = 0;

  /**
   * @private
   * @type {boolean}
   */
  this.imageRotateWithView_ = false;

  /**
   * @private
   * @type {number}
   */
  this.imageRotation_ = 0;

  /**
   * @private
   * @type {number}
   */
  this.imageScale_ = 0;

  /**
   * @private
   * @type {boolean}
   */
  this.imageSnapToPixel_ = false;

  /**
   * @private
   * @type {number}
   */
  this.imageWidth_ = 0;

  /**
   * @private
   * @type {string}
   */
  this.text_ = '';

  /**
   * @private
   * @type {number}
   */
  this.textOffsetX_ = 0;

  /**
   * @private
   * @type {number}
   */
  this.textOffsetY_ = 0;

  /**
   * @private
   * @type {boolean}
   */
  this.textRotateWithView_ = false;

  /**
   * @private
   * @type {number}
   */
  this.textRotation_ = 0;

  /**
   * @private
   * @type {number}
   */
  this.textScale_ = 0;

  /**
   * @private
   * @type {?ol.CanvasFillState}
   */
  this.textFillState_ = null;

  /**
   * @private
   * @type {?ol.CanvasStrokeState}
   */
  this.textStrokeState_ = null;

  /**
   * @private
   * @type {?ol.CanvasTextState}
   */
  this.textState_ = null;

  /**
   * @private
   * @type {Array.<number>}
   */
  this.pixelCoordinates_ = [];

  /**
   * @private
   * @type {ol.Transform}
   */
  this.tmpLocalTransform_ = ol.transform.create();

};
ol.inherits(ol.render.canvas.Immediate, ol.render.VectorContext);


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @private
 */
ol.render.canvas.Immediate.prototype.drawImages_ = function(flatCoordinates, offset, end, stride) {
  if (!this.image_) {
    return;
  }
  goog.DEBUG && console.assert(offset === 0, 'offset should be 0');
  goog.DEBUG && console.assert(end == flatCoordinates.length,
      'end should be equal to the length of flatCoordinates');
  var pixelCoordinates = ol.geom.flat.transform.transform2D(
      flatCoordinates, offset, end, 2, this.transform_,
      this.pixelCoordinates_);
  var context = this.context_;
  var localTransform = this.tmpLocalTransform_;
  var alpha = context.globalAlpha;
  if (this.imageOpacity_ != 1) {
    context.globalAlpha = alpha * this.imageOpacity_;
  }
  var rotation = this.imageRotation_;
  if (this.imageRotateWithView_) {
    rotation += this.viewRotation_;
  }
  var i, ii;
  for (i = 0, ii = pixelCoordinates.length; i < ii; i += 2) {
    var x = pixelCoordinates[i] - this.imageAnchorX_;
    var y = pixelCoordinates[i + 1] - this.imageAnchorY_;
    if (this.imageSnapToPixel_) {
      x = Math.round(x);
      y = Math.round(y);
    }
    if (rotation !== 0 || this.imageScale_ != 1) {
      var centerX = x + this.imageAnchorX_;
      var centerY = y + this.imageAnchorY_;
      ol.transform.compose(localTransform,
          centerX, centerY,
          this.imageScale_, this.imageScale_,
          rotation,
          -centerX, -centerY);
      context.setTransform.apply(context, localTransform);
    }
    context.drawImage(this.image_, this.imageOriginX_, this.imageOriginY_,
        this.imageWidth_, this.imageHeight_, x, y,
        this.imageWidth_, this.imageHeight_);
  }
  if (rotation !== 0 || this.imageScale_ != 1) {
    context.setTransform(1, 0, 0, 1, 0, 0);
  }
  if (this.imageOpacity_ != 1) {
    context.globalAlpha = alpha;
  }
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @private
 */
ol.render.canvas.Immediate.prototype.drawText_ = function(flatCoordinates, offset, end, stride) {
  if (!this.textState_ || this.text_ === '') {
    return;
  }
  if (this.textFillState_) {
    this.setContextFillState_(this.textFillState_);
  }
  if (this.textStrokeState_) {
    this.setContextStrokeState_(this.textStrokeState_);
  }
  this.setContextTextState_(this.textState_);
  goog.DEBUG && console.assert(offset === 0, 'offset should be 0');
  goog.DEBUG && console.assert(end == flatCoordinates.length,
      'end should be equal to the length of flatCoordinates');
  var pixelCoordinates = ol.geom.flat.transform.transform2D(
      flatCoordinates, offset, end, stride, this.transform_,
      this.pixelCoordinates_);
  var context = this.context_;
  var rotation = this.textRotation_;
  if (this.textRotateWithView_) {
    rotation += this.viewRotation_;
  }
  for (; offset < end; offset += stride) {
    var x = pixelCoordinates[offset] + this.textOffsetX_;
    var y = pixelCoordinates[offset + 1] + this.textOffsetY_;
    if (rotation !== 0 || this.textScale_ != 1) {
      var localTransform = ol.transform.compose(this.tmpLocalTransform_,
          x, y,
          this.textScale_, this.textScale_,
          rotation,
          -x, -y);
      context.setTransform.apply(context, localTransform);
    }
    if (this.textStrokeState_) {
      context.strokeText(this.text_, x, y);
    }
    if (this.textFillState_) {
      context.fillText(this.text_, x, y);
    }
  }
  if (rotation !== 0 || this.textScale_ != 1) {
    context.setTransform(1, 0, 0, 1, 0, 0);
  }
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @param {boolean} close Close.
 * @private
 * @return {number} end End.
 */
ol.render.canvas.Immediate.prototype.moveToLineTo_ = function(flatCoordinates, offset, end, stride, close) {
  var context = this.context_;
  var pixelCoordinates = ol.geom.flat.transform.transform2D(
      flatCoordinates, offset, end, stride, this.transform_,
      this.pixelCoordinates_);
  context.moveTo(pixelCoordinates[0], pixelCoordinates[1]);
  var length = pixelCoordinates.length;
  if (close) {
    length -= 2;
  }
  for (var i = 2; i < length; i += 2) {
    context.lineTo(pixelCoordinates[i], pixelCoordinates[i + 1]);
  }
  if (close) {
    context.closePath();
  }
  return end;
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array.<number>} ends Ends.
 * @param {number} stride Stride.
 * @private
 * @return {number} End.
 */
ol.render.canvas.Immediate.prototype.drawRings_ = function(flatCoordinates, offset, ends, stride) {
  var i, ii;
  for (i = 0, ii = ends.length; i < ii; ++i) {
    offset = this.moveToLineTo_(
        flatCoordinates, offset, ends[i], stride, true);
  }
  return offset;
};


/**
 * Render a circle geometry into the canvas.  Rendering is immediate and uses
 * the current fill and stroke styles.
 *
 * @param {ol.geom.Circle} geometry Circle geometry.
 * @api
 */
ol.render.canvas.Immediate.prototype.drawCircle = function(geometry) {
  if (!ol.extent.intersects(this.extent_, geometry.getExtent())) {
    return;
  }
  if (this.fillState_ || this.strokeState_) {
    if (this.fillState_) {
      this.setContextFillState_(this.fillState_);
    }
    if (this.strokeState_) {
      this.setContextStrokeState_(this.strokeState_);
    }
    var pixelCoordinates = ol.geom.SimpleGeometry.transform2D(
        geometry, this.transform_, this.pixelCoordinates_);
    var dx = pixelCoordinates[2] - pixelCoordinates[0];
    var dy = pixelCoordinates[3] - pixelCoordinates[1];
    var radius = Math.sqrt(dx * dx + dy * dy);
    var context = this.context_;
    context.beginPath();
    context.arc(
        pixelCoordinates[0], pixelCoordinates[1], radius, 0, 2 * Math.PI);
    if (this.fillState_) {
      context.fill();
    }
    if (this.strokeState_) {
      context.stroke();
    }
  }
  if (this.text_ !== '') {
    this.drawText_(geometry.getCenter(), 0, 2, 2);
  }
};


/**
 * Set the rendering style.  Note that since this is an immediate rendering API,
 * any `zIndex` on the provided style will be ignored.
 *
 * @param {ol.style.Style} style The rendering style.
 * @api
 */
ol.render.canvas.Immediate.prototype.setStyle = function(style) {
  this.setFillStrokeStyle(style.getFill(), style.getStroke());
  this.setImageStyle(style.getImage());
  this.setTextStyle(style.getText());
};


/**
 * Render a geometry into the canvas.  Call
 * {@link ol.render.canvas.Immediate#setStyle} first to set the rendering style.
 *
 * @param {ol.geom.Geometry|ol.render.Feature} geometry The geometry to render.
 * @api
 */
ol.render.canvas.Immediate.prototype.drawGeometry = function(geometry) {
  var type = geometry.getType();
  switch (type) {
    case ol.geom.GeometryType.POINT:
      this.drawPoint(/** @type {ol.geom.Point} */ (geometry));
      break;
    case ol.geom.GeometryType.LINE_STRING:
      this.drawLineString(/** @type {ol.geom.LineString} */ (geometry));
      break;
    case ol.geom.GeometryType.POLYGON:
      this.drawPolygon(/** @type {ol.geom.Polygon} */ (geometry));
      break;
    case ol.geom.GeometryType.MULTI_POINT:
      this.drawMultiPoint(/** @type {ol.geom.MultiPoint} */ (geometry));
      break;
    case ol.geom.GeometryType.MULTI_LINE_STRING:
      this.drawMultiLineString(/** @type {ol.geom.MultiLineString} */ (geometry));
      break;
    case ol.geom.GeometryType.MULTI_POLYGON:
      this.drawMultiPolygon(/** @type {ol.geom.MultiPolygon} */ (geometry));
      break;
    case ol.geom.GeometryType.GEOMETRY_COLLECTION:
      this.drawGeometryCollection(/** @type {ol.geom.GeometryCollection} */ (geometry));
      break;
    case ol.geom.GeometryType.CIRCLE:
      this.drawCircle(/** @type {ol.geom.Circle} */ (geometry));
      break;
    default:
      goog.DEBUG && console.assert(false, 'Unsupported geometry type: ' + type);
  }
};


/**
 * Render a feature into the canvas.  Note that any `zIndex` on the provided
 * style will be ignored - features are rendered immediately in the order that
 * this method is called.  If you need `zIndex` support, you should be using an
 * {@link ol.layer.Vector} instead.
 *
 * @param {ol.Feature} feature Feature.
 * @param {ol.style.Style} style Style.
 * @api
 */
ol.render.canvas.Immediate.prototype.drawFeature = function(feature, style) {
  var geometry = style.getGeometryFunction()(feature);
  if (!geometry ||
      !ol.extent.intersects(this.extent_, geometry.getExtent())) {
    return;
  }
  this.setStyle(style);
  this.drawGeometry(geometry);
};


/**
 * Render a GeometryCollection to the canvas.  Rendering is immediate and
 * uses the current styles appropriate for each geometry in the collection.
 *
 * @param {ol.geom.GeometryCollection} geometry Geometry collection.
 */
ol.render.canvas.Immediate.prototype.drawGeometryCollection = function(geometry) {
  var geometries = geometry.getGeometriesArray();
  var i, ii;
  for (i = 0, ii = geometries.length; i < ii; ++i) {
    this.drawGeometry(geometries[i]);
  }
};


/**
 * Render a Point geometry into the canvas.  Rendering is immediate and uses
 * the current style.
 *
 * @param {ol.geom.Point|ol.render.Feature} geometry Point geometry.
 */
ol.render.canvas.Immediate.prototype.drawPoint = function(geometry) {
  var flatCoordinates = geometry.getFlatCoordinates();
  var stride = geometry.getStride();
  if (this.image_) {
    this.drawImages_(flatCoordinates, 0, flatCoordinates.length, stride);
  }
  if (this.text_ !== '') {
    this.drawText_(flatCoordinates, 0, flatCoordinates.length, stride);
  }
};


/**
 * Render a MultiPoint geometry  into the canvas.  Rendering is immediate and
 * uses the current style.
 *
 * @param {ol.geom.MultiPoint|ol.render.Feature} geometry MultiPoint geometry.
 */
ol.render.canvas.Immediate.prototype.drawMultiPoint = function(geometry) {
  var flatCoordinates = geometry.getFlatCoordinates();
  var stride = geometry.getStride();
  if (this.image_) {
    this.drawImages_(flatCoordinates, 0, flatCoordinates.length, stride);
  }
  if (this.text_ !== '') {
    this.drawText_(flatCoordinates, 0, flatCoordinates.length, stride);
  }
};


/**
 * Render a LineString into the canvas.  Rendering is immediate and uses
 * the current style.
 *
 * @param {ol.geom.LineString|ol.render.Feature} geometry LineString geometry.
 */
ol.render.canvas.Immediate.prototype.drawLineString = function(geometry) {
  if (!ol.extent.intersects(this.extent_, geometry.getExtent())) {
    return;
  }
  if (this.strokeState_) {
    this.setContextStrokeState_(this.strokeState_);
    var context = this.context_;
    var flatCoordinates = geometry.getFlatCoordinates();
    context.beginPath();
    this.moveToLineTo_(flatCoordinates, 0, flatCoordinates.length,
        geometry.getStride(), false);
    context.stroke();
  }
  if (this.text_ !== '') {
    var flatMidpoint = geometry.getFlatMidpoint();
    this.drawText_(flatMidpoint, 0, 2, 2);
  }
};


/**
 * Render a MultiLineString geometry into the canvas.  Rendering is immediate
 * and uses the current style.
 *
 * @param {ol.geom.MultiLineString|ol.render.Feature} geometry MultiLineString
 *     geometry.
 */
ol.render.canvas.Immediate.prototype.drawMultiLineString = function(geometry) {
  var geometryExtent = geometry.getExtent();
  if (!ol.extent.intersects(this.extent_, geometryExtent)) {
    return;
  }
  if (this.strokeState_) {
    this.setContextStrokeState_(this.strokeState_);
    var context = this.context_;
    var flatCoordinates = geometry.getFlatCoordinates();
    var offset = 0;
    var ends = geometry.getEnds();
    var stride = geometry.getStride();
    context.beginPath();
    var i, ii;
    for (i = 0, ii = ends.length; i < ii; ++i) {
      offset = this.moveToLineTo_(
          flatCoordinates, offset, ends[i], stride, false);
    }
    context.stroke();
  }
  if (this.text_ !== '') {
    var flatMidpoints = geometry.getFlatMidpoints();
    this.drawText_(flatMidpoints, 0, flatMidpoints.length, 2);
  }
};


/**
 * Render a Polygon geometry into the canvas.  Rendering is immediate and uses
 * the current style.
 *
 * @param {ol.geom.Polygon|ol.render.Feature} geometry Polygon geometry.
 */
ol.render.canvas.Immediate.prototype.drawPolygon = function(geometry) {
  if (!ol.extent.intersects(this.extent_, geometry.getExtent())) {
    return;
  }
  if (this.strokeState_ || this.fillState_) {
    if (this.fillState_) {
      this.setContextFillState_(this.fillState_);
    }
    if (this.strokeState_) {
      this.setContextStrokeState_(this.strokeState_);
    }
    var context = this.context_;
    context.beginPath();
    this.drawRings_(geometry.getOrientedFlatCoordinates(),
        0, geometry.getEnds(), geometry.getStride());
    if (this.fillState_) {
      context.fill();
    }
    if (this.strokeState_) {
      context.stroke();
    }
  }
  if (this.text_ !== '') {
    var flatInteriorPoint = geometry.getFlatInteriorPoint();
    this.drawText_(flatInteriorPoint, 0, 2, 2);
  }
};


/**
 * Render MultiPolygon geometry into the canvas.  Rendering is immediate and
 * uses the current style.
 * @param {ol.geom.MultiPolygon} geometry MultiPolygon geometry.
 */
ol.render.canvas.Immediate.prototype.drawMultiPolygon = function(geometry) {
  if (!ol.extent.intersects(this.extent_, geometry.getExtent())) {
    return;
  }
  if (this.strokeState_ || this.fillState_) {
    if (this.fillState_) {
      this.setContextFillState_(this.fillState_);
    }
    if (this.strokeState_) {
      this.setContextStrokeState_(this.strokeState_);
    }
    var context = this.context_;
    var flatCoordinates = geometry.getOrientedFlatCoordinates();
    var offset = 0;
    var endss = geometry.getEndss();
    var stride = geometry.getStride();
    var i, ii;
    for (i = 0, ii = endss.length; i < ii; ++i) {
      var ends = endss[i];
      context.beginPath();
      offset = this.drawRings_(flatCoordinates, offset, ends, stride);
      if (this.fillState_) {
        context.fill();
      }
      if (this.strokeState_) {
        context.stroke();
      }
    }
  }
  if (this.text_ !== '') {
    var flatInteriorPoints = geometry.getFlatInteriorPoints();
    this.drawText_(flatInteriorPoints, 0, flatInteriorPoints.length, 2);
  }
};


/**
 * @param {ol.CanvasFillState} fillState Fill state.
 * @private
 */
ol.render.canvas.Immediate.prototype.setContextFillState_ = function(fillState) {
  var context = this.context_;
  var contextFillState = this.contextFillState_;
  if (!contextFillState) {
    context.fillStyle = fillState.fillStyle;
    this.contextFillState_ = {
      fillStyle: fillState.fillStyle
    };
  } else {
    if (contextFillState.fillStyle != fillState.fillStyle) {
      contextFillState.fillStyle = context.fillStyle = fillState.fillStyle;
    }
  }
};


/**
 * @param {ol.CanvasStrokeState} strokeState Stroke state.
 * @private
 */
ol.render.canvas.Immediate.prototype.setContextStrokeState_ = function(strokeState) {
  var context = this.context_;
  var contextStrokeState = this.contextStrokeState_;
  if (!contextStrokeState) {
    context.lineCap = strokeState.lineCap;
    if (ol.has.CANVAS_LINE_DASH) {
      context.setLineDash(strokeState.lineDash);
    }
    context.lineJoin = strokeState.lineJoin;
    context.lineWidth = strokeState.lineWidth;
    context.miterLimit = strokeState.miterLimit;
    context.strokeStyle = strokeState.strokeStyle;
    this.contextStrokeState_ = {
      lineCap: strokeState.lineCap,
      lineDash: strokeState.lineDash,
      lineJoin: strokeState.lineJoin,
      lineWidth: strokeState.lineWidth,
      miterLimit: strokeState.miterLimit,
      strokeStyle: strokeState.strokeStyle
    };
  } else {
    if (contextStrokeState.lineCap != strokeState.lineCap) {
      contextStrokeState.lineCap = context.lineCap = strokeState.lineCap;
    }
    if (ol.has.CANVAS_LINE_DASH) {
      if (!ol.array.equals(
          contextStrokeState.lineDash, strokeState.lineDash)) {
        context.setLineDash(contextStrokeState.lineDash = strokeState.lineDash);
      }
    }
    if (contextStrokeState.lineJoin != strokeState.lineJoin) {
      contextStrokeState.lineJoin = context.lineJoin = strokeState.lineJoin;
    }
    if (contextStrokeState.lineWidth != strokeState.lineWidth) {
      contextStrokeState.lineWidth = context.lineWidth = strokeState.lineWidth;
    }
    if (contextStrokeState.miterLimit != strokeState.miterLimit) {
      contextStrokeState.miterLimit = context.miterLimit =
          strokeState.miterLimit;
    }
    if (contextStrokeState.strokeStyle != strokeState.strokeStyle) {
      contextStrokeState.strokeStyle = context.strokeStyle =
          strokeState.strokeStyle;
    }
  }
};


/**
 * @param {ol.CanvasTextState} textState Text state.
 * @private
 */
ol.render.canvas.Immediate.prototype.setContextTextState_ = function(textState) {
  var context = this.context_;
  var contextTextState = this.contextTextState_;
  if (!contextTextState) {
    context.font = textState.font;
    context.textAlign = textState.textAlign;
    context.textBaseline = textState.textBaseline;
    this.contextTextState_ = {
      font: textState.font,
      textAlign: textState.textAlign,
      textBaseline: textState.textBaseline
    };
  } else {
    if (contextTextState.font != textState.font) {
      contextTextState.font = context.font = textState.font;
    }
    if (contextTextState.textAlign != textState.textAlign) {
      contextTextState.textAlign = context.textAlign = textState.textAlign;
    }
    if (contextTextState.textBaseline != textState.textBaseline) {
      contextTextState.textBaseline = context.textBaseline =
          textState.textBaseline;
    }
  }
};


/**
 * Set the fill and stroke style for subsequent draw operations.  To clear
 * either fill or stroke styles, pass null for the appropriate parameter.
 *
 * @param {ol.style.Fill} fillStyle Fill style.
 * @param {ol.style.Stroke} strokeStyle Stroke style.
 */
ol.render.canvas.Immediate.prototype.setFillStrokeStyle = function(fillStyle, strokeStyle) {
  if (!fillStyle) {
    this.fillState_ = null;
  } else {
    var fillStyleColor = fillStyle.getColor();
    this.fillState_ = {
      fillStyle: ol.colorlike.asColorLike(fillStyleColor ?
          fillStyleColor : ol.render.canvas.defaultFillStyle)
    };
  }
  if (!strokeStyle) {
    this.strokeState_ = null;
  } else {
    var strokeStyleColor = strokeStyle.getColor();
    var strokeStyleLineCap = strokeStyle.getLineCap();
    var strokeStyleLineDash = strokeStyle.getLineDash();
    var strokeStyleLineJoin = strokeStyle.getLineJoin();
    var strokeStyleWidth = strokeStyle.getWidth();
    var strokeStyleMiterLimit = strokeStyle.getMiterLimit();
    this.strokeState_ = {
      lineCap: strokeStyleLineCap !== undefined ?
          strokeStyleLineCap : ol.render.canvas.defaultLineCap,
      lineDash: strokeStyleLineDash ?
          strokeStyleLineDash : ol.render.canvas.defaultLineDash,
      lineJoin: strokeStyleLineJoin !== undefined ?
          strokeStyleLineJoin : ol.render.canvas.defaultLineJoin,
      lineWidth: this.pixelRatio_ * (strokeStyleWidth !== undefined ?
          strokeStyleWidth : ol.render.canvas.defaultLineWidth),
      miterLimit: strokeStyleMiterLimit !== undefined ?
          strokeStyleMiterLimit : ol.render.canvas.defaultMiterLimit,
      strokeStyle: ol.color.asString(strokeStyleColor ?
          strokeStyleColor : ol.render.canvas.defaultStrokeStyle)
    };
  }
};


/**
 * Set the image style for subsequent draw operations.  Pass null to remove
 * the image style.
 *
 * @param {ol.style.Image} imageStyle Image style.
 */
ol.render.canvas.Immediate.prototype.setImageStyle = function(imageStyle) {
  if (!imageStyle) {
    this.image_ = null;
  } else {
    var imageAnchor = imageStyle.getAnchor();
    // FIXME pixel ratio
    var imageImage = imageStyle.getImage(1);
    var imageOrigin = imageStyle.getOrigin();
    var imageSize = imageStyle.getSize();
    goog.DEBUG && console.assert(imageImage, 'imageImage must be truthy');
    this.imageAnchorX_ = imageAnchor[0];
    this.imageAnchorY_ = imageAnchor[1];
    this.imageHeight_ = imageSize[1];
    this.image_ = imageImage;
    this.imageOpacity_ = imageStyle.getOpacity();
    this.imageOriginX_ = imageOrigin[0];
    this.imageOriginY_ = imageOrigin[1];
    this.imageRotateWithView_ = imageStyle.getRotateWithView();
    this.imageRotation_ = imageStyle.getRotation();
    this.imageScale_ = imageStyle.getScale();
    this.imageSnapToPixel_ = imageStyle.getSnapToPixel();
    this.imageWidth_ = imageSize[0];
  }
};


/**
 * Set the text style for subsequent draw operations.  Pass null to
 * remove the text style.
 *
 * @param {ol.style.Text} textStyle Text style.
 */
ol.render.canvas.Immediate.prototype.setTextStyle = function(textStyle) {
  if (!textStyle) {
    this.text_ = '';
  } else {
    var textFillStyle = textStyle.getFill();
    if (!textFillStyle) {
      this.textFillState_ = null;
    } else {
      var textFillStyleColor = textFillStyle.getColor();
      this.textFillState_ = {
        fillStyle: ol.colorlike.asColorLike(textFillStyleColor ?
            textFillStyleColor : ol.render.canvas.defaultFillStyle)
      };
    }
    var textStrokeStyle = textStyle.getStroke();
    if (!textStrokeStyle) {
      this.textStrokeState_ = null;
    } else {
      var textStrokeStyleColor = textStrokeStyle.getColor();
      var textStrokeStyleLineCap = textStrokeStyle.getLineCap();
      var textStrokeStyleLineDash = textStrokeStyle.getLineDash();
      var textStrokeStyleLineJoin = textStrokeStyle.getLineJoin();
      var textStrokeStyleWidth = textStrokeStyle.getWidth();
      var textStrokeStyleMiterLimit = textStrokeStyle.getMiterLimit();
      this.textStrokeState_ = {
        lineCap: textStrokeStyleLineCap !== undefined ?
            textStrokeStyleLineCap : ol.render.canvas.defaultLineCap,
        lineDash: textStrokeStyleLineDash ?
            textStrokeStyleLineDash : ol.render.canvas.defaultLineDash,
        lineJoin: textStrokeStyleLineJoin !== undefined ?
            textStrokeStyleLineJoin : ol.render.canvas.defaultLineJoin,
        lineWidth: textStrokeStyleWidth !== undefined ?
            textStrokeStyleWidth : ol.render.canvas.defaultLineWidth,
        miterLimit: textStrokeStyleMiterLimit !== undefined ?
            textStrokeStyleMiterLimit : ol.render.canvas.defaultMiterLimit,
        strokeStyle: ol.color.asString(textStrokeStyleColor ?
            textStrokeStyleColor : ol.render.canvas.defaultStrokeStyle)
      };
    }
    var textFont = textStyle.getFont();
    var textOffsetX = textStyle.getOffsetX();
    var textOffsetY = textStyle.getOffsetY();
    var textRotateWithView = textStyle.getRotateWithView();
    var textRotation = textStyle.getRotation();
    var textScale = textStyle.getScale();
    var textText = textStyle.getText();
    var textTextAlign = textStyle.getTextAlign();
    var textTextBaseline = textStyle.getTextBaseline();
    this.textState_ = {
      font: textFont !== undefined ?
          textFont : ol.render.canvas.defaultFont,
      textAlign: textTextAlign !== undefined ?
          textTextAlign : ol.render.canvas.defaultTextAlign,
      textBaseline: textTextBaseline !== undefined ?
          textTextBaseline : ol.render.canvas.defaultTextBaseline
    };
    this.text_ = textText !== undefined ? textText : '';
    this.textOffsetX_ =
        textOffsetX !== undefined ? (this.pixelRatio_ * textOffsetX) : 0;
    this.textOffsetY_ =
        textOffsetY !== undefined ? (this.pixelRatio_ * textOffsetY) : 0;
    this.textRotateWithView_ = textRotateWithView !== undefined ? textRotateWithView : false;
    this.textRotation_ = textRotation !== undefined ? textRotation : 0;
    this.textScale_ = this.pixelRatio_ * (textScale !== undefined ?
        textScale : 1);
  }
};

goog.provide('ol.ImageBase');
goog.provide('ol.ImageState');

goog.require('ol');
goog.require('ol.events.EventTarget');
goog.require('ol.events.EventType');


/**
 * @enum {number}
 */
ol.ImageState = {
  IDLE: 0,
  LOADING: 1,
  LOADED: 2,
  ERROR: 3
};


/**
 * @constructor
 * @extends {ol.events.EventTarget}
 * @param {ol.Extent} extent Extent.
 * @param {number|undefined} resolution Resolution.
 * @param {number} pixelRatio Pixel ratio.
 * @param {ol.ImageState} state State.
 * @param {Array.<ol.Attribution>} attributions Attributions.
 */
ol.ImageBase = function(extent, resolution, pixelRatio, state, attributions) {

  ol.events.EventTarget.call(this);

  /**
   * @private
   * @type {Array.<ol.Attribution>}
   */
  this.attributions_ = attributions;

  /**
   * @protected
   * @type {ol.Extent}
   */
  this.extent = extent;

  /**
   * @private
   * @type {number}
   */
  this.pixelRatio_ = pixelRatio;

  /**
   * @protected
   * @type {number|undefined}
   */
  this.resolution = resolution;

  /**
   * @protected
   * @type {ol.ImageState}
   */
  this.state = state;

};
ol.inherits(ol.ImageBase, ol.events.EventTarget);


/**
 * @protected
 */
ol.ImageBase.prototype.changed = function() {
  this.dispatchEvent(ol.events.EventType.CHANGE);
};


/**
 * @return {Array.<ol.Attribution>} Attributions.
 */
ol.ImageBase.prototype.getAttributions = function() {
  return this.attributions_;
};


/**
 * @return {ol.Extent} Extent.
 */
ol.ImageBase.prototype.getExtent = function() {
  return this.extent;
};


/**
 * @abstract
 * @param {Object=} opt_context Object.
 * @return {HTMLCanvasElement|Image|HTMLVideoElement} Image.
 */
ol.ImageBase.prototype.getImage = function(opt_context) {};


/**
 * @return {number} PixelRatio.
 */
ol.ImageBase.prototype.getPixelRatio = function() {
  return this.pixelRatio_;
};


/**
 * @return {number} Resolution.
 */
ol.ImageBase.prototype.getResolution = function() {
  goog.DEBUG && console.assert(this.resolution !== undefined, 'resolution not yet set');
  return /** @type {number} */ (this.resolution);
};


/**
 * @return {ol.ImageState} State.
 */
ol.ImageBase.prototype.getState = function() {
  return this.state;
};


/**
 * Load not yet loaded URI.
 * @abstract
 */
ol.ImageBase.prototype.load = function() {};

goog.provide('ol.renderer.Layer');

goog.require('ol');
goog.require('ol.ImageState');
goog.require('ol.Observable');
goog.require('ol.Tile');
goog.require('ol.asserts');
goog.require('ol.events');
goog.require('ol.events.EventType');
goog.require('ol.functions');
goog.require('ol.source.State');
goog.require('ol.transform');


/**
 * @constructor
 * @extends {ol.Observable}
 * @param {ol.layer.Layer} layer Layer.
 * @struct
 */
ol.renderer.Layer = function(layer) {

  ol.Observable.call(this);

  /**
   * @private
   * @type {ol.layer.Layer}
   */
  this.layer_ = layer;


};
ol.inherits(ol.renderer.Layer, ol.Observable);


/**
 * @param {ol.Coordinate} coordinate Coordinate.
 * @param {olx.FrameState} frameState Frame state.
 * @param {function(this: S, (ol.Feature|ol.render.Feature), ol.layer.Layer): T}
 *     callback Feature callback.
 * @param {S} thisArg Value to use as `this` when executing `callback`.
 * @return {T|undefined} Callback result.
 * @template S,T
 */
ol.renderer.Layer.prototype.forEachFeatureAtCoordinate = ol.nullFunction;


/**
 * @param {ol.Pixel} pixel Pixel.
 * @param {olx.FrameState} frameState Frame state.
 * @param {function(this: S, ol.layer.Layer, ol.Color): T} callback Layer callback.
 * @param {S} thisArg Value to use as `this` when executing `callback`.
 * @return {T|undefined} Callback result.
 * @template S,T
 */
ol.renderer.Layer.prototype.forEachLayerAtPixel = function(pixel, frameState, callback, thisArg) {
  var coordinate = ol.transform.apply(
      frameState.pixelToCoordinateTransform, pixel.slice());

  var hasFeature = this.forEachFeatureAtCoordinate(
      coordinate, frameState, ol.functions.TRUE, this);

  if (hasFeature) {
    return callback.call(thisArg, this.layer_, null);
  } else {
    return undefined;
  }
};


/**
 * @param {ol.Coordinate} coordinate Coordinate.
 * @param {olx.FrameState} frameState Frame state.
 * @return {boolean} Is there a feature at the given coordinate?
 */
ol.renderer.Layer.prototype.hasFeatureAtCoordinate = ol.functions.FALSE;


/**
 * Create a function that adds loaded tiles to the tile lookup.
 * @param {ol.source.Tile} source Tile source.
 * @param {ol.proj.Projection} projection Projection of the tiles.
 * @param {Object.<number, Object.<string, ol.Tile>>} tiles Lookup of loaded
 *     tiles by zoom level.
 * @return {function(number, ol.TileRange):boolean} A function that can be
 *     called with a zoom level and a tile range to add loaded tiles to the
 *     lookup.
 * @protected
 */
ol.renderer.Layer.prototype.createLoadedTileFinder = function(source, projection, tiles) {
  return (
      /**
       * @param {number} zoom Zoom level.
       * @param {ol.TileRange} tileRange Tile range.
       * @return {boolean} The tile range is fully loaded.
       */
      function(zoom, tileRange) {
        function callback(tile) {
          if (!tiles[zoom]) {
            tiles[zoom] = {};
          }
          tiles[zoom][tile.tileCoord.toString()] = tile;
        }
        return source.forEachLoadedTile(projection, zoom, tileRange, callback);
      });
};


/**
 * @return {ol.layer.Layer} Layer.
 */
ol.renderer.Layer.prototype.getLayer = function() {
  return this.layer_;
};


/**
 * Handle changes in image state.
 * @param {ol.events.Event} event Image change event.
 * @private
 */
ol.renderer.Layer.prototype.handleImageChange_ = function(event) {
  var image = /** @type {ol.Image} */ (event.target);
  if (image.getState() === ol.ImageState.LOADED) {
    this.renderIfReadyAndVisible();
  }
};


/**
 * Load the image if not already loaded, and register the image change
 * listener if needed.
 * @param {ol.ImageBase} image Image.
 * @return {boolean} `true` if the image is already loaded, `false`
 *     otherwise.
 * @protected
 */
ol.renderer.Layer.prototype.loadImage = function(image) {
  var imageState = image.getState();
  if (imageState != ol.ImageState.LOADED &&
      imageState != ol.ImageState.ERROR) {
    // the image is either "idle" or "loading", register the change
    // listener (a noop if the listener was already registered)
    goog.DEBUG && console.assert(imageState == ol.ImageState.IDLE ||
        imageState == ol.ImageState.LOADING,
        'imageState is "idle" or "loading"');
    ol.events.listen(image, ol.events.EventType.CHANGE,
        this.handleImageChange_, this);
  }
  if (imageState == ol.ImageState.IDLE) {
    image.load();
    imageState = image.getState();
    goog.DEBUG && console.assert(imageState == ol.ImageState.LOADING ||
        imageState == ol.ImageState.LOADED,
        'imageState is "loading" or "loaded"');
  }
  return imageState == ol.ImageState.LOADED;
};


/**
 * @protected
 */
ol.renderer.Layer.prototype.renderIfReadyAndVisible = function() {
  var layer = this.getLayer();
  if (layer.getVisible() && layer.getSourceState() == ol.source.State.READY) {
    this.changed();
  }
};


/**
 * @param {olx.FrameState} frameState Frame state.
 * @param {ol.source.Tile} tileSource Tile source.
 * @protected
 */
ol.renderer.Layer.prototype.scheduleExpireCache = function(frameState, tileSource) {
  if (tileSource.canExpireCache()) {
    /**
     * @param {ol.source.Tile} tileSource Tile source.
     * @param {ol.Map} map Map.
     * @param {olx.FrameState} frameState Frame state.
     */
    var postRenderFunction = function(tileSource, map, frameState) {
      var tileSourceKey = ol.getUid(tileSource).toString();
      tileSource.expireCache(frameState.viewState.projection,
                             frameState.usedTiles[tileSourceKey]);
    }.bind(null, tileSource);

    frameState.postRenderFunctions.push(
      /** @type {ol.PostRenderFunction} */ (postRenderFunction)
    );
  }
};


/**
 * @param {Object.<string, ol.Attribution>} attributionsSet Attributions
 *     set (target).
 * @param {Array.<ol.Attribution>} attributions Attributions (source).
 * @protected
 */
ol.renderer.Layer.prototype.updateAttributions = function(attributionsSet, attributions) {
  if (attributions) {
    var attribution, i, ii;
    for (i = 0, ii = attributions.length; i < ii; ++i) {
      attribution = attributions[i];
      attributionsSet[ol.getUid(attribution).toString()] = attribution;
    }
  }
};


/**
 * @param {olx.FrameState} frameState Frame state.
 * @param {ol.source.Source} source Source.
 * @protected
 */
ol.renderer.Layer.prototype.updateLogos = function(frameState, source) {
  var logo = source.getLogo();
  if (logo !== undefined) {
    if (typeof logo === 'string') {
      frameState.logos[logo] = '';
    } else if (logo) {
      ol.asserts.assert(typeof logo.href == 'string', 44); // `logo.href` should be a string.
      ol.asserts.assert(typeof logo.src == 'string', 45); // `logo.src` should be a string.
      frameState.logos[logo.src] = logo.href;
    }
  }
};


/**
 * @param {Object.<string, Object.<string, ol.TileRange>>} usedTiles Used tiles.
 * @param {ol.source.Tile} tileSource Tile source.
 * @param {number} z Z.
 * @param {ol.TileRange} tileRange Tile range.
 * @protected
 */
ol.renderer.Layer.prototype.updateUsedTiles = function(usedTiles, tileSource, z, tileRange) {
  // FIXME should we use tilesToDrawByZ instead?
  var tileSourceKey = ol.getUid(tileSource).toString();
  var zKey = z.toString();
  if (tileSourceKey in usedTiles) {
    if (zKey in usedTiles[tileSourceKey]) {
      usedTiles[tileSourceKey][zKey].extend(tileRange);
    } else {
      usedTiles[tileSourceKey][zKey] = tileRange;
    }
  } else {
    usedTiles[tileSourceKey] = {};
    usedTiles[tileSourceKey][zKey] = tileRange;
  }
};


/**
 * @param {ol.Coordinate} center Center.
 * @param {number} resolution Resolution.
 * @param {ol.Size} size Size.
 * @protected
 * @return {ol.Coordinate} Snapped center.
 */
ol.renderer.Layer.prototype.snapCenterToPixel = function(center, resolution, size) {
  return [
    resolution * (Math.round(center[0] / resolution) + (size[0] % 2) / 2),
    resolution * (Math.round(center[1] / resolution) + (size[1] % 2) / 2)
  ];
};


/**
 * Manage tile pyramid.
 * This function performs a number of functions related to the tiles at the
 * current zoom and lower zoom levels:
 * - registers idle tiles in frameState.wantedTiles so that they are not
 *   discarded by the tile queue
 * - enqueues missing tiles
 * @param {olx.FrameState} frameState Frame state.
 * @param {ol.source.Tile} tileSource Tile source.
 * @param {ol.tilegrid.TileGrid} tileGrid Tile grid.
 * @param {number} pixelRatio Pixel ratio.
 * @param {ol.proj.Projection} projection Projection.
 * @param {ol.Extent} extent Extent.
 * @param {number} currentZ Current Z.
 * @param {number} preload Load low resolution tiles up to 'preload' levels.
 * @param {function(this: T, ol.Tile)=} opt_tileCallback Tile callback.
 * @param {T=} opt_this Object to use as `this` in `opt_tileCallback`.
 * @protected
 * @template T
 */
ol.renderer.Layer.prototype.manageTilePyramid = function(
    frameState, tileSource, tileGrid, pixelRatio, projection, extent,
    currentZ, preload, opt_tileCallback, opt_this) {
  var tileSourceKey = ol.getUid(tileSource).toString();
  if (!(tileSourceKey in frameState.wantedTiles)) {
    frameState.wantedTiles[tileSourceKey] = {};
  }
  var wantedTiles = frameState.wantedTiles[tileSourceKey];
  var tileQueue = frameState.tileQueue;
  var minZoom = tileGrid.getMinZoom();
  var tile, tileRange, tileResolution, x, y, z;
  for (z = currentZ; z >= minZoom; --z) {
    tileRange = tileGrid.getTileRangeForExtentAndZ(extent, z, tileRange);
    tileResolution = tileGrid.getResolution(z);
    for (x = tileRange.minX; x <= tileRange.maxX; ++x) {
      for (y = tileRange.minY; y <= tileRange.maxY; ++y) {
        if (currentZ - z <= preload) {
          tile = tileSource.getTile(z, x, y, pixelRatio, projection);
          if (tile.getState() == ol.Tile.State.IDLE) {
            wantedTiles[tile.getKey()] = true;
            if (!tileQueue.isKeyQueued(tile.getKey())) {
              tileQueue.enqueue([tile, tileSourceKey,
                tileGrid.getTileCoordCenter(tile.tileCoord), tileResolution]);
            }
          }
          if (opt_tileCallback !== undefined) {
            opt_tileCallback.call(opt_this, tile);
          }
        } else {
          tileSource.useTile(z, x, y, projection);
        }
      }
    }
  }
};

goog.provide('ol.renderer.canvas.Layer');

goog.require('ol');
goog.require('ol.extent');
goog.require('ol.render.Event');
goog.require('ol.render.EventType');
goog.require('ol.render.canvas');
goog.require('ol.render.canvas.Immediate');
goog.require('ol.renderer.Layer');
goog.require('ol.transform');


/**
 * @constructor
 * @extends {ol.renderer.Layer}
 * @param {ol.layer.Layer} layer Layer.
 */
ol.renderer.canvas.Layer = function(layer) {

  ol.renderer.Layer.call(this, layer);

  /**
   * @private
   * @type {ol.Transform}
   */
  this.transform_ = ol.transform.create();

};
ol.inherits(ol.renderer.canvas.Layer, ol.renderer.Layer);


/**
 * @param {CanvasRenderingContext2D} context Context.
 * @param {olx.FrameState} frameState Frame state.
 * @param {ol.Extent} extent Clip extent.
 * @protected
 */
ol.renderer.canvas.Layer.prototype.clip = function(context, frameState, extent) {
  var pixelRatio = frameState.pixelRatio;
  var width = frameState.size[0] * pixelRatio;
  var height = frameState.size[1] * pixelRatio;
  var rotation = frameState.viewState.rotation;
  var topLeft = ol.extent.getTopLeft(/** @type {ol.Extent} */ (extent));
  var topRight = ol.extent.getTopRight(/** @type {ol.Extent} */ (extent));
  var bottomRight = ol.extent.getBottomRight(/** @type {ol.Extent} */ (extent));
  var bottomLeft = ol.extent.getBottomLeft(/** @type {ol.Extent} */ (extent));

  ol.transform.apply(frameState.coordinateToPixelTransform, topLeft);
  ol.transform.apply(frameState.coordinateToPixelTransform, topRight);
  ol.transform.apply(frameState.coordinateToPixelTransform, bottomRight);
  ol.transform.apply(frameState.coordinateToPixelTransform, bottomLeft);

  context.save();
  ol.render.canvas.rotateAtOffset(context, -rotation, width / 2, height / 2);
  context.beginPath();
  context.moveTo(topLeft[0] * pixelRatio, topLeft[1] * pixelRatio);
  context.lineTo(topRight[0] * pixelRatio, topRight[1] * pixelRatio);
  context.lineTo(bottomRight[0] * pixelRatio, bottomRight[1] * pixelRatio);
  context.lineTo(bottomLeft[0] * pixelRatio, bottomLeft[1] * pixelRatio);
  context.clip();
  ol.render.canvas.rotateAtOffset(context, rotation, width / 2, height / 2);
};


/**
 * @param {olx.FrameState} frameState Frame state.
 * @param {ol.LayerState} layerState Layer state.
 * @param {CanvasRenderingContext2D} context Context.
 */
ol.renderer.canvas.Layer.prototype.composeFrame = function(frameState, layerState, context) {

  this.dispatchPreComposeEvent(context, frameState);

  var image = this.getImage();
  if (image) {

    // clipped rendering if layer extent is set
    var extent = layerState.extent;
    var clipped = extent !== undefined;
    if (clipped) {
      this.clip(context, frameState, /** @type {ol.Extent} */ (extent));
    }

    var imageTransform = this.getImageTransform();
    // for performance reasons, context.save / context.restore is not used
    // to save and restore the transformation matrix and the opacity.
    // see http://jsperf.com/context-save-restore-versus-variable
    var alpha = context.globalAlpha;
    context.globalAlpha = layerState.opacity;

    // for performance reasons, context.setTransform is only used
    // when the view is rotated. see http://jsperf.com/canvas-transform
    var dx = imageTransform[4];
    var dy = imageTransform[5];
    var dw = image.width * imageTransform[0];
    var dh = image.height * imageTransform[3];
    context.drawImage(image, 0, 0, +image.width, +image.height,
        Math.round(dx), Math.round(dy), Math.round(dw), Math.round(dh));
    context.globalAlpha = alpha;

    if (clipped) {
      context.restore();
    }
  }

  this.dispatchPostComposeEvent(context, frameState);

};


/**
 * @param {ol.render.EventType} type Event type.
 * @param {CanvasRenderingContext2D} context Context.
 * @param {olx.FrameState} frameState Frame state.
 * @param {ol.Transform=} opt_transform Transform.
 * @private
 */
ol.renderer.canvas.Layer.prototype.dispatchComposeEvent_ = function(type, context, frameState, opt_transform) {
  var layer = this.getLayer();
  if (layer.hasListener(type)) {
    var width = frameState.size[0] * frameState.pixelRatio;
    var height = frameState.size[1] * frameState.pixelRatio;
    var rotation = frameState.viewState.rotation;
    ol.render.canvas.rotateAtOffset(context, -rotation, width / 2, height / 2);
    var transform = opt_transform !== undefined ?
        opt_transform : this.getTransform(frameState, 0);
    var render = new ol.render.canvas.Immediate(
        context, frameState.pixelRatio, frameState.extent, transform,
        frameState.viewState.rotation);
    var composeEvent = new ol.render.Event(type, render, frameState,
        context, null);
    layer.dispatchEvent(composeEvent);
    ol.render.canvas.rotateAtOffset(context, rotation, width / 2, height / 2);
  }
};


/**
 * @param {CanvasRenderingContext2D} context Context.
 * @param {olx.FrameState} frameState Frame state.
 * @param {ol.Transform=} opt_transform Transform.
 * @protected
 */
ol.renderer.canvas.Layer.prototype.dispatchPostComposeEvent = function(context, frameState, opt_transform) {
  this.dispatchComposeEvent_(ol.render.EventType.POSTCOMPOSE, context,
      frameState, opt_transform);
};


/**
 * @param {CanvasRenderingContext2D} context Context.
 * @param {olx.FrameState} frameState Frame state.
 * @param {ol.Transform=} opt_transform Transform.
 * @protected
 */
ol.renderer.canvas.Layer.prototype.dispatchPreComposeEvent = function(context, frameState, opt_transform) {
  this.dispatchComposeEvent_(ol.render.EventType.PRECOMPOSE, context,
      frameState, opt_transform);
};


/**
 * @param {CanvasRenderingContext2D} context Context.
 * @param {olx.FrameState} frameState Frame state.
 * @param {ol.Transform=} opt_transform Transform.
 * @protected
 */
ol.renderer.canvas.Layer.prototype.dispatchRenderEvent = function(context, frameState, opt_transform) {
  this.dispatchComposeEvent_(ol.render.EventType.RENDER, context,
      frameState, opt_transform);
};


/**
 * @abstract
 * @return {HTMLCanvasElement|HTMLVideoElement|Image} Canvas.
 */
ol.renderer.canvas.Layer.prototype.getImage = function() {};


/**
 * @abstract
 * @return {!ol.Transform} Image transform.
 */
ol.renderer.canvas.Layer.prototype.getImageTransform = function() {};


/**
 * @param {olx.FrameState} frameState Frame state.
 * @param {number} offsetX Offset on the x-axis in view coordinates.
 * @protected
 * @return {!ol.Transform} Transform.
 */
ol.renderer.canvas.Layer.prototype.getTransform = function(frameState, offsetX) {
  var viewState = frameState.viewState;
  var pixelRatio = frameState.pixelRatio;
  var dx1 = pixelRatio * frameState.size[0] / 2;
  var dy1 = pixelRatio * frameState.size[1] / 2;
  var sx = pixelRatio / viewState.resolution;
  var sy = -sx;
  var angle = -viewState.rotation;
  var dx2 = -viewState.center[0] + offsetX;
  var dy2 = -viewState.center[1];
  return ol.transform.compose(this.transform_, dx1, dy1, sx, sy, angle, dx2, dy2);
};


/**
 * @abstract
 * @param {olx.FrameState} frameState Frame state.
 * @param {ol.LayerState} layerState Layer state.
 * @return {boolean} whether composeFrame should be called.
 */
ol.renderer.canvas.Layer.prototype.prepareFrame = function(frameState, layerState) {};


/**
 * @param {ol.Pixel} pixelOnMap Pixel.
 * @param {ol.Transform} imageTransformInv The transformation matrix
 *        to convert from a map pixel to a canvas pixel.
 * @return {ol.Pixel} The pixel.
 * @protected
 */
ol.renderer.canvas.Layer.prototype.getPixelOnCanvas = function(pixelOnMap, imageTransformInv) {
  return ol.transform.apply(imageTransformInv, pixelOnMap.slice());
};

goog.provide('ol.render.ReplayGroup');


/**
 * Base class for replay groups.
 * @constructor
 */
ol.render.ReplayGroup = function() {};


/**
 * @abstract
 * @param {number|undefined} zIndex Z index.
 * @param {ol.render.ReplayType} replayType Replay type.
 * @return {ol.render.VectorContext} Replay.
 */
ol.render.ReplayGroup.prototype.getReplay = function(zIndex, replayType) {};


/**
 * @abstract
 * @return {boolean} Is empty.
 */
ol.render.ReplayGroup.prototype.isEmpty = function() {};

goog.provide('ol.render.ReplayType');


/**
 * @enum {string}
 */
ol.render.ReplayType = {
  IMAGE: 'Image',
  LINE_STRING: 'LineString',
  POLYGON: 'Polygon',
  TEXT: 'Text'
};

goog.provide('ol.render.replay');

goog.require('ol.render.ReplayType');


/**
 * @const
 * @type {Array.<ol.render.ReplayType>}
 */
ol.render.replay.ORDER = [
  ol.render.ReplayType.POLYGON,
  ol.render.ReplayType.LINE_STRING,
  ol.render.ReplayType.IMAGE,
  ol.render.ReplayType.TEXT
];

// FIXME add option to apply snapToPixel to all coordinates?
// FIXME can eliminate empty set styles and strokes (when all geoms skipped)

goog.provide('ol.render.canvas.Replay');
goog.provide('ol.render.canvas.ImageReplay');
goog.provide('ol.render.canvas.LineStringReplay');
goog.provide('ol.render.canvas.PolygonReplay');
goog.provide('ol.render.canvas.ReplayGroup');
goog.provide('ol.render.canvas.TextReplay');

goog.require('ol');
goog.require('ol.array');
goog.require('ol.color');
goog.require('ol.colorlike');
goog.require('ol.dom');
goog.require('ol.extent');
goog.require('ol.extent.Relationship');
goog.require('ol.geom.flat.simplify');
goog.require('ol.geom.flat.transform');
goog.require('ol.has');
goog.require('ol.obj');
goog.require('ol.render.ReplayGroup');
goog.require('ol.render.VectorContext');
goog.require('ol.render.canvas');
goog.require('ol.render.replay');
goog.require('ol.transform');


/**
 * @enum {number}
 */
ol.render.canvas.Instruction = {
  BEGIN_GEOMETRY: 0,
  BEGIN_PATH: 1,
  CIRCLE: 2,
  CLOSE_PATH: 3,
  DRAW_IMAGE: 4,
  DRAW_TEXT: 5,
  END_GEOMETRY: 6,
  FILL: 7,
  MOVE_TO_LINE_TO: 8,
  SET_FILL_STYLE: 9,
  SET_STROKE_STYLE: 10,
  SET_TEXT_STYLE: 11,
  STROKE: 12
};


/**
 * @constructor
 * @extends {ol.render.VectorContext}
 * @param {number} tolerance Tolerance.
 * @param {ol.Extent} maxExtent Maximum extent.
 * @param {number} resolution Resolution.
 * @param {boolean} overlaps The replay can have overlapping geometries.
 * @protected
 * @struct
 */
ol.render.canvas.Replay = function(tolerance, maxExtent, resolution, overlaps) {
  ol.render.VectorContext.call(this);

  /**
   * @protected
   * @type {number}
   */
  this.tolerance = tolerance;

  /**
   * @protected
   * @const
   * @type {ol.Extent}
   */
  this.maxExtent = maxExtent;

  /**
   * @protected
   * @type {boolean}
   */
  this.overlaps = overlaps;

  /**
   * @private
   * @type {ol.Extent}
   */
  this.bufferedMaxExtent_ = null;

  /**
   * @protected
   * @type {number}
   */
  this.maxLineWidth = 0;

  /**
   * @protected
   * @const
   * @type {number}
   */
  this.resolution = resolution;

  /**
   * @private
   * @type {Array.<*>}
   */
  this.beginGeometryInstruction1_ = null;

  /**
   * @private
   * @type {Array.<*>}
   */
  this.beginGeometryInstruction2_ = null;

  /**
   * @protected
   * @type {Array.<*>}
   */
  this.instructions = [];

  /**
   * @protected
   * @type {Array.<number>}
   */
  this.coordinates = [];

  /**
   * @private
   * @type {ol.Transform}
   */
  this.renderedTransform_ = ol.transform.create();

  /**
   * @protected
   * @type {Array.<*>}
   */
  this.hitDetectionInstructions = [];

  /**
   * @private
   * @type {Array.<number>}
   */
  this.pixelCoordinates_ = [];

  /**
   * @private
   * @type {ol.Transform}
   */
  this.tmpLocalTransform_ = ol.transform.create();

  /**
   * @private
   * @type {ol.Transform}
   */
  this.tmpLocalTransformInv_ = ol.transform.create();
};
ol.inherits(ol.render.canvas.Replay, ol.render.VectorContext);


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @param {boolean} close Close.
 * @protected
 * @return {number} My end.
 */
ol.render.canvas.Replay.prototype.appendFlatCoordinates = function(flatCoordinates, offset, end, stride, close) {

  var myEnd = this.coordinates.length;
  var extent = this.getBufferedMaxExtent();
  var lastCoord = [flatCoordinates[offset], flatCoordinates[offset + 1]];
  var nextCoord = [NaN, NaN];
  var skipped = true;

  var i, lastRel, nextRel;
  for (i = offset + stride; i < end; i += stride) {
    nextCoord[0] = flatCoordinates[i];
    nextCoord[1] = flatCoordinates[i + 1];
    nextRel = ol.extent.coordinateRelationship(extent, nextCoord);
    if (nextRel !== lastRel) {
      if (skipped) {
        this.coordinates[myEnd++] = lastCoord[0];
        this.coordinates[myEnd++] = lastCoord[1];
      }
      this.coordinates[myEnd++] = nextCoord[0];
      this.coordinates[myEnd++] = nextCoord[1];
      skipped = false;
    } else if (nextRel === ol.extent.Relationship.INTERSECTING) {
      this.coordinates[myEnd++] = nextCoord[0];
      this.coordinates[myEnd++] = nextCoord[1];
      skipped = false;
    } else {
      skipped = true;
    }
    lastCoord[0] = nextCoord[0];
    lastCoord[1] = nextCoord[1];
    lastRel = nextRel;
  }

  // handle case where there is only one point to append
  if (i === offset + stride) {
    this.coordinates[myEnd++] = lastCoord[0];
    this.coordinates[myEnd++] = lastCoord[1];
  }

  if (close) {
    this.coordinates[myEnd++] = flatCoordinates[offset];
    this.coordinates[myEnd++] = flatCoordinates[offset + 1];
  }
  return myEnd;
};


/**
 * @protected
 * @param {ol.geom.Geometry|ol.render.Feature} geometry Geometry.
 * @param {ol.Feature|ol.render.Feature} feature Feature.
 */
ol.render.canvas.Replay.prototype.beginGeometry = function(geometry, feature) {
  this.beginGeometryInstruction1_ =
      [ol.render.canvas.Instruction.BEGIN_GEOMETRY, feature, 0];
  this.instructions.push(this.beginGeometryInstruction1_);
  this.beginGeometryInstruction2_ =
      [ol.render.canvas.Instruction.BEGIN_GEOMETRY, feature, 0];
  this.hitDetectionInstructions.push(this.beginGeometryInstruction2_);
};


/**
 * @private
 * @param {CanvasRenderingContext2D} context Context.
 * @param {number} pixelRatio Pixel ratio.
 * @param {ol.Transform} transform Transform.
 * @param {number} viewRotation View rotation.
 * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
 *     to skip.
 * @param {Array.<*>} instructions Instructions array.
 * @param {function((ol.Feature|ol.render.Feature)): T|undefined}
 *     featureCallback Feature callback.
 * @param {ol.Extent=} opt_hitExtent Only check features that intersect this
 *     extent.
 * @return {T|undefined} Callback result.
 * @template T
 */
ol.render.canvas.Replay.prototype.replay_ = function(
    context, pixelRatio, transform, viewRotation, skippedFeaturesHash,
    instructions, featureCallback, opt_hitExtent) {
  /** @type {Array.<number>} */
  var pixelCoordinates;
  if (ol.array.equals(transform, this.renderedTransform_)) {
    pixelCoordinates = this.pixelCoordinates_;
  } else {
    pixelCoordinates = ol.geom.flat.transform.transform2D(
        this.coordinates, 0, this.coordinates.length, 2,
        transform, this.pixelCoordinates_);
    ol.transform.setFromArray(this.renderedTransform_, transform);
    goog.DEBUG && console.assert(pixelCoordinates === this.pixelCoordinates_,
        'pixelCoordinates should be the same as this.pixelCoordinates_');
  }
  var skipFeatures = !ol.obj.isEmpty(skippedFeaturesHash);
  var i = 0; // instruction index
  var ii = instructions.length; // end of instructions
  var d = 0; // data index
  var dd; // end of per-instruction data
  var localTransform = this.tmpLocalTransform_;
  var localTransformInv = this.tmpLocalTransformInv_;
  var prevX, prevY, roundX, roundY;
  var pendingFill = 0;
  var pendingStroke = 0;
  // When the batch size gets too big, performance decreases. 200 is a good
  // balance between batch size and number of fill/stroke instructions.
  var batchSize =
      this.instructions != instructions || this.overlaps ? 0 : 200;
  while (i < ii) {
    var instruction = instructions[i];
    var type = /** @type {ol.render.canvas.Instruction} */ (instruction[0]);
    var feature, fill, stroke, text, x, y;
    switch (type) {
      case ol.render.canvas.Instruction.BEGIN_GEOMETRY:
        feature = /** @type {ol.Feature|ol.render.Feature} */ (instruction[1]);
        if ((skipFeatures &&
            skippedFeaturesHash[ol.getUid(feature).toString()]) ||
            !feature.getGeometry()) {
          i = /** @type {number} */ (instruction[2]);
        } else if (opt_hitExtent !== undefined && !ol.extent.intersects(
            opt_hitExtent, feature.getGeometry().getExtent())) {
          i = /** @type {number} */ (instruction[2]) + 1;
        } else {
          ++i;
        }
        break;
      case ol.render.canvas.Instruction.BEGIN_PATH:
        if (pendingFill > batchSize) {
          context.fill();
          pendingFill = 0;
        }
        if (pendingStroke > batchSize) {
          context.stroke();
          pendingStroke = 0;
        }
        if (!pendingFill && !pendingStroke) {
          context.beginPath();
        }
        ++i;
        break;
      case ol.render.canvas.Instruction.CIRCLE:
        goog.DEBUG && console.assert(typeof instruction[1] === 'number',
            'second instruction should be a number');
        d = /** @type {number} */ (instruction[1]);
        var x1 = pixelCoordinates[d];
        var y1 = pixelCoordinates[d + 1];
        var x2 = pixelCoordinates[d + 2];
        var y2 = pixelCoordinates[d + 3];
        var dx = x2 - x1;
        var dy = y2 - y1;
        var r = Math.sqrt(dx * dx + dy * dy);
        context.moveTo(x1 + r, y1);
        context.arc(x1, y1, r, 0, 2 * Math.PI, true);
        ++i;
        break;
      case ol.render.canvas.Instruction.CLOSE_PATH:
        context.closePath();
        ++i;
        break;
      case ol.render.canvas.Instruction.DRAW_IMAGE:
        goog.DEBUG && console.assert(typeof instruction[1] === 'number',
            'second instruction should be a number');
        d = /** @type {number} */ (instruction[1]);
        goog.DEBUG && console.assert(typeof instruction[2] === 'number',
            'third instruction should be a number');
        dd = /** @type {number} */ (instruction[2]);
        var image =  /** @type {HTMLCanvasElement|HTMLVideoElement|Image} */
            (instruction[3]);
        // Remaining arguments in DRAW_IMAGE are in alphabetical order
        var anchorX = /** @type {number} */ (instruction[4]) * pixelRatio;
        var anchorY = /** @type {number} */ (instruction[5]) * pixelRatio;
        var height = /** @type {number} */ (instruction[6]);
        var opacity = /** @type {number} */ (instruction[7]);
        var originX = /** @type {number} */ (instruction[8]);
        var originY = /** @type {number} */ (instruction[9]);
        var rotateWithView = /** @type {boolean} */ (instruction[10]);
        var rotation = /** @type {number} */ (instruction[11]);
        var scale = /** @type {number} */ (instruction[12]);
        var snapToPixel = /** @type {boolean} */ (instruction[13]);
        var width = /** @type {number} */ (instruction[14]);
        if (rotateWithView) {
          rotation += viewRotation;
        }
        for (; d < dd; d += 2) {
          x = pixelCoordinates[d] - anchorX;
          y = pixelCoordinates[d + 1] - anchorY;
          if (snapToPixel) {
            x = Math.round(x);
            y = Math.round(y);
          }
          if (scale != 1 || rotation !== 0) {
            var centerX = x + anchorX;
            var centerY = y + anchorY;
            ol.transform.compose(localTransform,
                centerX, centerY, scale, scale, rotation, -centerX, -centerY);
            context.transform.apply(context, localTransform);
          }
          var alpha = context.globalAlpha;
          if (opacity != 1) {
            context.globalAlpha = alpha * opacity;
          }

          var w = (width + originX > image.width) ? image.width - originX : width;
          var h = (height + originY > image.height) ? image.height - originY : height;

          context.drawImage(image, originX, originY, w, h,
              x, y, w * pixelRatio, h * pixelRatio);

          if (opacity != 1) {
            context.globalAlpha = alpha;
          }
          if (scale != 1 || rotation !== 0) {
            ol.transform.invert(ol.transform.setFromArray(localTransformInv, localTransform));
            context.transform.apply(context, localTransformInv);
          }
        }
        ++i;
        break;
      case ol.render.canvas.Instruction.DRAW_TEXT:
        goog.DEBUG && console.assert(typeof instruction[1] === 'number',
            '2nd instruction should be a number');
        d = /** @type {number} */ (instruction[1]);
        goog.DEBUG && console.assert(typeof instruction[2] === 'number',
            '3rd instruction should be a number');
        dd = /** @type {number} */ (instruction[2]);
        goog.DEBUG && console.assert(typeof instruction[3] === 'string',
            '4th instruction should be a string');
        text = /** @type {string} */ (instruction[3]);
        goog.DEBUG && console.assert(typeof instruction[4] === 'number',
            '5th instruction should be a number');
        var offsetX = /** @type {number} */ (instruction[4]) * pixelRatio;
        goog.DEBUG && console.assert(typeof instruction[5] === 'number',
            '6th instruction should be a number');
        var offsetY = /** @type {number} */ (instruction[5]) * pixelRatio;
        goog.DEBUG && console.assert(typeof instruction[6] === 'number',
            '7th instruction should be a number');
        rotation = /** @type {number} */ (instruction[6]);
        goog.DEBUG && console.assert(typeof instruction[7] === 'number',
            '8th instruction should be a number');
        scale = /** @type {number} */ (instruction[7]) * pixelRatio;
        goog.DEBUG && console.assert(typeof instruction[8] === 'boolean',
            '9th instruction should be a boolean');
        fill = /** @type {boolean} */ (instruction[8]);
        goog.DEBUG && console.assert(typeof instruction[9] === 'boolean',
            '10th instruction should be a boolean');
        stroke = /** @type {boolean} */ (instruction[9]);
        rotateWithView = /** @type {boolean} */ (instruction[10]);
        if (rotateWithView) {
          rotation += viewRotation;
        }
        for (; d < dd; d += 2) {
          x = pixelCoordinates[d] + offsetX;
          y = pixelCoordinates[d + 1] + offsetY;
          if (scale != 1 || rotation !== 0) {
            ol.transform.compose(localTransform, x, y, scale, scale, rotation, -x, -y);
            context.transform.apply(context, localTransform);
          }

          // Support multiple lines separated by \n
          var lines = text.split('\n');
          var numLines = lines.length;
          var fontSize, lineY;
          if (numLines > 1) {
            // Estimate line height using width of capital M, and add padding
            fontSize = Math.round(context.measureText('M').width * 1.5);
            lineY = y - (((numLines - 1) / 2) * fontSize);
          } else {
            // No need to calculate line height/offset for a single line
            fontSize = 0;
            lineY = y;
          }

          for (var lineIndex = 0; lineIndex < numLines; lineIndex++) {
            var line = lines[lineIndex];
            if (stroke) {
              context.strokeText(line, x, lineY);
            }
            if (fill) {
              context.fillText(line, x, lineY);
            }

            // Move next line down by fontSize px
            lineY = lineY + fontSize;
          }

          if (scale != 1 || rotation !== 0) {
            ol.transform.invert(ol.transform.setFromArray(localTransformInv, localTransform));
            context.transform.apply(context, localTransformInv);
          }
        }
        ++i;
        break;
      case ol.render.canvas.Instruction.END_GEOMETRY:
        if (featureCallback !== undefined) {
          feature =
              /** @type {ol.Feature|ol.render.Feature} */ (instruction[1]);
          var result = featureCallback(feature);
          if (result) {
            return result;
          }
        }
        ++i;
        break;
      case ol.render.canvas.Instruction.FILL:
        if (batchSize) {
          pendingFill++;
        } else {
          context.fill();
        }
        ++i;
        break;
      case ol.render.canvas.Instruction.MOVE_TO_LINE_TO:
        goog.DEBUG && console.assert(typeof instruction[1] === 'number',
            '2nd instruction should be a number');
        d = /** @type {number} */ (instruction[1]);
        goog.DEBUG && console.assert(typeof instruction[2] === 'number',
            '3rd instruction should be a number');
        dd = /** @type {number} */ (instruction[2]);
        x = pixelCoordinates[d];
        y = pixelCoordinates[d + 1];
        roundX = (x + 0.5) | 0;
        roundY = (y + 0.5) | 0;
        if (roundX !== prevX || roundY !== prevY) {
          context.moveTo(x, y);
          prevX = roundX;
          prevY = roundY;
        }
        for (d += 2; d < dd; d += 2) {
          x = pixelCoordinates[d];
          y = pixelCoordinates[d + 1];
          roundX = (x + 0.5) | 0;
          roundY = (y + 0.5) | 0;
          if (d == dd - 2 || roundX !== prevX || roundY !== prevY) {
            context.lineTo(x, y);
            prevX = roundX;
            prevY = roundY;
          }
        }
        ++i;
        break;
      case ol.render.canvas.Instruction.SET_FILL_STYLE:
        goog.DEBUG && console.assert(
            ol.colorlike.isColorLike(instruction[1]),
            '2nd instruction should be a string, ' +
            'CanvasPattern, or CanvasGradient');
        if (pendingFill) {
          context.fill();
          pendingFill = 0;
        }

        context.fillStyle = /** @type {ol.ColorLike} */ (instruction[1]);
        ++i;
        break;
      case ol.render.canvas.Instruction.SET_STROKE_STYLE:
        goog.DEBUG && console.assert(typeof instruction[1] === 'string',
            '2nd instruction should be a string');
        goog.DEBUG && console.assert(typeof instruction[2] === 'number',
            '3rd instruction should be a number');
        goog.DEBUG && console.assert(typeof instruction[3] === 'string',
            '4rd instruction should be a string');
        goog.DEBUG && console.assert(typeof instruction[4] === 'string',
            '5th instruction should be a string');
        goog.DEBUG && console.assert(typeof instruction[5] === 'number',
            '6th instruction should be a number');
        goog.DEBUG && console.assert(instruction[6],
            '7th instruction should not be null');
        var usePixelRatio = instruction[7] !== undefined ?
            instruction[7] : true;
        var lineWidth = /** @type {number} */ (instruction[2]);
        if (pendingStroke) {
          context.stroke();
          pendingStroke = 0;
        }
        context.strokeStyle = /** @type {string} */ (instruction[1]);
        context.lineWidth = usePixelRatio ? lineWidth * pixelRatio : lineWidth;
        context.lineCap = /** @type {string} */ (instruction[3]);
        context.lineJoin = /** @type {string} */ (instruction[4]);
        context.miterLimit = /** @type {number} */ (instruction[5]);
        if (ol.has.CANVAS_LINE_DASH) {
          context.setLineDash(/** @type {Array.<number>} */ (instruction[6]));
        }
        prevX = NaN;
        prevY = NaN;
        ++i;
        break;
      case ol.render.canvas.Instruction.SET_TEXT_STYLE:
        goog.DEBUG && console.assert(typeof instruction[1] === 'string',
            '2nd instruction should be a string');
        goog.DEBUG && console.assert(typeof instruction[2] === 'string',
            '3rd instruction should be a string');
        goog.DEBUG && console.assert(typeof instruction[3] === 'string',
            '4th instruction should be a string');
        context.font = /** @type {string} */ (instruction[1]);
        context.textAlign = /** @type {string} */ (instruction[2]);
        context.textBaseline = /** @type {string} */ (instruction[3]);
        ++i;
        break;
      case ol.render.canvas.Instruction.STROKE:
        if (batchSize) {
          pendingStroke++;
        } else {
          context.stroke();
        }
        ++i;
        break;
      default:
        goog.DEBUG && console.assert(false, 'Unknown canvas render instruction');
        ++i; // consume the instruction anyway, to avoid an infinite loop
        break;
    }
  }
  if (pendingFill) {
    context.fill();
  }
  if (pendingStroke) {
    context.stroke();
  }
  // assert that all instructions were consumed
  goog.DEBUG && console.assert(i == instructions.length,
      'all instructions should be consumed');
  return undefined;
};


/**
 * @param {CanvasRenderingContext2D} context Context.
 * @param {number} pixelRatio Pixel ratio.
 * @param {ol.Transform} transform Transform.
 * @param {number} viewRotation View rotation.
 * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
 *     to skip.
 */
ol.render.canvas.Replay.prototype.replay = function(
    context, pixelRatio, transform, viewRotation, skippedFeaturesHash) {
  var instructions = this.instructions;
  this.replay_(context, pixelRatio, transform, viewRotation,
      skippedFeaturesHash, instructions, undefined, undefined);
};


/**
 * @param {CanvasRenderingContext2D} context Context.
 * @param {ol.Transform} transform Transform.
 * @param {number} viewRotation View rotation.
 * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
 *     to skip.
 * @param {function((ol.Feature|ol.render.Feature)): T=} opt_featureCallback
 *     Feature callback.
 * @param {ol.Extent=} opt_hitExtent Only check features that intersect this
 *     extent.
 * @return {T|undefined} Callback result.
 * @template T
 */
ol.render.canvas.Replay.prototype.replayHitDetection = function(
    context, transform, viewRotation, skippedFeaturesHash,
    opt_featureCallback, opt_hitExtent) {
  var instructions = this.hitDetectionInstructions;
  return this.replay_(context, 1, transform, viewRotation,
      skippedFeaturesHash, instructions, opt_featureCallback, opt_hitExtent);
};


/**
 * @private
 */
ol.render.canvas.Replay.prototype.reverseHitDetectionInstructions_ = function() {
  var hitDetectionInstructions = this.hitDetectionInstructions;
  // step 1 - reverse array
  hitDetectionInstructions.reverse();
  // step 2 - reverse instructions within geometry blocks
  var i;
  var n = hitDetectionInstructions.length;
  var instruction;
  var type;
  var begin = -1;
  for (i = 0; i < n; ++i) {
    instruction = hitDetectionInstructions[i];
    type = /** @type {ol.render.canvas.Instruction} */ (instruction[0]);
    if (type == ol.render.canvas.Instruction.END_GEOMETRY) {
      goog.DEBUG && console.assert(begin == -1, 'begin should be -1');
      begin = i;
    } else if (type == ol.render.canvas.Instruction.BEGIN_GEOMETRY) {
      instruction[2] = i;
      goog.DEBUG && console.assert(begin >= 0,
          'begin should be larger than or equal to 0');
      ol.array.reverseSubArray(this.hitDetectionInstructions, begin, i);
      begin = -1;
    }
  }
};


/**
 * @param {ol.geom.Geometry|ol.render.Feature} geometry Geometry.
 * @param {ol.Feature|ol.render.Feature} feature Feature.
 */
ol.render.canvas.Replay.prototype.endGeometry = function(geometry, feature) {
  goog.DEBUG && console.assert(this.beginGeometryInstruction1_,
      'this.beginGeometryInstruction1_ should not be null');
  this.beginGeometryInstruction1_[2] = this.instructions.length;
  this.beginGeometryInstruction1_ = null;
  goog.DEBUG && console.assert(this.beginGeometryInstruction2_,
      'this.beginGeometryInstruction2_ should not be null');
  this.beginGeometryInstruction2_[2] = this.hitDetectionInstructions.length;
  this.beginGeometryInstruction2_ = null;
  var endGeometryInstruction =
      [ol.render.canvas.Instruction.END_GEOMETRY, feature];
  this.instructions.push(endGeometryInstruction);
  this.hitDetectionInstructions.push(endGeometryInstruction);
};


/**
 * FIXME empty description for jsdoc
 */
ol.render.canvas.Replay.prototype.finish = ol.nullFunction;


/**
 * Get the buffered rendering extent.  Rendering will be clipped to the extent
 * provided to the constructor.  To account for symbolizers that may intersect
 * this extent, we calculate a buffered extent (e.g. based on stroke width).
 * @return {ol.Extent} The buffered rendering extent.
 * @protected
 */
ol.render.canvas.Replay.prototype.getBufferedMaxExtent = function() {
  return this.maxExtent;
};


/**
 * @constructor
 * @extends {ol.render.canvas.Replay}
 * @param {number} tolerance Tolerance.
 * @param {ol.Extent} maxExtent Maximum extent.
 * @param {number} resolution Resolution.
 * @param {boolean} overlaps The replay can have overlapping geometries.
 * @protected
 * @struct
 */
ol.render.canvas.ImageReplay = function(tolerance, maxExtent, resolution, overlaps) {
  ol.render.canvas.Replay.call(this, tolerance, maxExtent, resolution, overlaps);

  /**
   * @private
   * @type {HTMLCanvasElement|HTMLVideoElement|Image}
   */
  this.hitDetectionImage_ = null;

  /**
   * @private
   * @type {HTMLCanvasElement|HTMLVideoElement|Image}
   */
  this.image_ = null;

  /**
   * @private
   * @type {number|undefined}
   */
  this.anchorX_ = undefined;

  /**
   * @private
   * @type {number|undefined}
   */
  this.anchorY_ = undefined;

  /**
   * @private
   * @type {number|undefined}
   */
  this.height_ = undefined;

  /**
   * @private
   * @type {number|undefined}
   */
  this.opacity_ = undefined;

  /**
   * @private
   * @type {number|undefined}
   */
  this.originX_ = undefined;

  /**
   * @private
   * @type {number|undefined}
   */
  this.originY_ = undefined;

  /**
   * @private
   * @type {boolean|undefined}
   */
  this.rotateWithView_ = undefined;

  /**
   * @private
   * @type {number|undefined}
   */
  this.rotation_ = undefined;

  /**
   * @private
   * @type {number|undefined}
   */
  this.scale_ = undefined;

  /**
   * @private
   * @type {boolean|undefined}
   */
  this.snapToPixel_ = undefined;

  /**
   * @private
   * @type {number|undefined}
   */
  this.width_ = undefined;

};
ol.inherits(ol.render.canvas.ImageReplay, ol.render.canvas.Replay);


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @private
 * @return {number} My end.
 */
ol.render.canvas.ImageReplay.prototype.drawCoordinates_ = function(flatCoordinates, offset, end, stride) {
  return this.appendFlatCoordinates(
      flatCoordinates, offset, end, stride, false);
};


/**
 * @inheritDoc
 */
ol.render.canvas.ImageReplay.prototype.drawPoint = function(pointGeometry, feature) {
  if (!this.image_) {
    return;
  }
  goog.DEBUG && console.assert(this.anchorX_ !== undefined,
      'this.anchorX_ should be defined');
  goog.DEBUG && console.assert(this.anchorY_ !== undefined,
      'this.anchorY_ should be defined');
  goog.DEBUG && console.assert(this.height_ !== undefined,
      'this.height_ should be defined');
  goog.DEBUG && console.assert(this.opacity_ !== undefined,
      'this.opacity_ should be defined');
  goog.DEBUG && console.assert(this.originX_ !== undefined,
      'this.originX_ should be defined');
  goog.DEBUG && console.assert(this.originY_ !== undefined,
      'this.originY_ should be defined');
  goog.DEBUG && console.assert(this.rotateWithView_ !== undefined,
      'this.rotateWithView_ should be defined');
  goog.DEBUG && console.assert(this.rotation_ !== undefined,
      'this.rotation_ should be defined');
  goog.DEBUG && console.assert(this.scale_ !== undefined,
      'this.scale_ should be defined');
  goog.DEBUG && console.assert(this.width_ !== undefined,
      'this.width_ should be defined');
  this.beginGeometry(pointGeometry, feature);
  var flatCoordinates = pointGeometry.getFlatCoordinates();
  var stride = pointGeometry.getStride();
  var myBegin = this.coordinates.length;
  var myEnd = this.drawCoordinates_(
      flatCoordinates, 0, flatCoordinates.length, stride);
  this.instructions.push([
    ol.render.canvas.Instruction.DRAW_IMAGE, myBegin, myEnd, this.image_,
    // Remaining arguments to DRAW_IMAGE are in alphabetical order
    this.anchorX_, this.anchorY_, this.height_, this.opacity_,
    this.originX_, this.originY_, this.rotateWithView_, this.rotation_,
    this.scale_, this.snapToPixel_, this.width_
  ]);
  this.hitDetectionInstructions.push([
    ol.render.canvas.Instruction.DRAW_IMAGE, myBegin, myEnd,
    this.hitDetectionImage_,
    // Remaining arguments to DRAW_IMAGE are in alphabetical order
    this.anchorX_, this.anchorY_, this.height_, this.opacity_,
    this.originX_, this.originY_, this.rotateWithView_, this.rotation_,
    this.scale_, this.snapToPixel_, this.width_
  ]);
  this.endGeometry(pointGeometry, feature);
};


/**
 * @inheritDoc
 */
ol.render.canvas.ImageReplay.prototype.drawMultiPoint = function(multiPointGeometry, feature) {
  if (!this.image_) {
    return;
  }
  goog.DEBUG && console.assert(this.anchorX_ !== undefined,
      'this.anchorX_ should be defined');
  goog.DEBUG && console.assert(this.anchorY_ !== undefined,
      'this.anchorY_ should be defined');
  goog.DEBUG && console.assert(this.height_ !== undefined,
      'this.height_ should be defined');
  goog.DEBUG && console.assert(this.opacity_ !== undefined,
      'this.opacity_ should be defined');
  goog.DEBUG && console.assert(this.originX_ !== undefined,
      'this.originX_ should be defined');
  goog.DEBUG && console.assert(this.originY_ !== undefined,
      'this.originY_ should be defined');
  goog.DEBUG && console.assert(this.rotateWithView_ !== undefined,
      'this.rotateWithView_ should be defined');
  goog.DEBUG && console.assert(this.rotation_ !== undefined,
      'this.rotation_ should be defined');
  goog.DEBUG && console.assert(this.scale_ !== undefined,
      'this.scale_ should be defined');
  goog.DEBUG && console.assert(this.width_ !== undefined,
      'this.width_ should be defined');
  this.beginGeometry(multiPointGeometry, feature);
  var flatCoordinates = multiPointGeometry.getFlatCoordinates();
  var stride = multiPointGeometry.getStride();
  var myBegin = this.coordinates.length;
  var myEnd = this.drawCoordinates_(
      flatCoordinates, 0, flatCoordinates.length, stride);
  this.instructions.push([
    ol.render.canvas.Instruction.DRAW_IMAGE, myBegin, myEnd, this.image_,
    // Remaining arguments to DRAW_IMAGE are in alphabetical order
    this.anchorX_, this.anchorY_, this.height_, this.opacity_,
    this.originX_, this.originY_, this.rotateWithView_, this.rotation_,
    this.scale_, this.snapToPixel_, this.width_
  ]);
  this.hitDetectionInstructions.push([
    ol.render.canvas.Instruction.DRAW_IMAGE, myBegin, myEnd,
    this.hitDetectionImage_,
    // Remaining arguments to DRAW_IMAGE are in alphabetical order
    this.anchorX_, this.anchorY_, this.height_, this.opacity_,
    this.originX_, this.originY_, this.rotateWithView_, this.rotation_,
    this.scale_, this.snapToPixel_, this.width_
  ]);
  this.endGeometry(multiPointGeometry, feature);
};


/**
 * @inheritDoc
 */
ol.render.canvas.ImageReplay.prototype.finish = function() {
  this.reverseHitDetectionInstructions_();
  // FIXME this doesn't really protect us against further calls to draw*Geometry
  this.anchorX_ = undefined;
  this.anchorY_ = undefined;
  this.hitDetectionImage_ = null;
  this.image_ = null;
  this.height_ = undefined;
  this.scale_ = undefined;
  this.opacity_ = undefined;
  this.originX_ = undefined;
  this.originY_ = undefined;
  this.rotateWithView_ = undefined;
  this.rotation_ = undefined;
  this.snapToPixel_ = undefined;
  this.width_ = undefined;
};


/**
 * @inheritDoc
 */
ol.render.canvas.ImageReplay.prototype.setImageStyle = function(imageStyle) {
  goog.DEBUG && console.assert(imageStyle, 'imageStyle should not be null');
  var anchor = imageStyle.getAnchor();
  goog.DEBUG && console.assert(anchor, 'anchor should not be null');
  var size = imageStyle.getSize();
  goog.DEBUG && console.assert(size, 'size should not be null');
  var hitDetectionImage = imageStyle.getHitDetectionImage(1);
  goog.DEBUG && console.assert(hitDetectionImage,
      'hitDetectionImage should not be null');
  var image = imageStyle.getImage(1);
  goog.DEBUG && console.assert(image, 'image should not be null');
  var origin = imageStyle.getOrigin();
  goog.DEBUG && console.assert(origin, 'origin should not be null');
  this.anchorX_ = anchor[0];
  this.anchorY_ = anchor[1];
  this.hitDetectionImage_ = hitDetectionImage;
  this.image_ = image;
  this.height_ = size[1];
  this.opacity_ = imageStyle.getOpacity();
  this.originX_ = origin[0];
  this.originY_ = origin[1];
  this.rotateWithView_ = imageStyle.getRotateWithView();
  this.rotation_ = imageStyle.getRotation();
  this.scale_ = imageStyle.getScale();
  this.snapToPixel_ = imageStyle.getSnapToPixel();
  this.width_ = size[0];
};


/**
 * @constructor
 * @extends {ol.render.canvas.Replay}
 * @param {number} tolerance Tolerance.
 * @param {ol.Extent} maxExtent Maximum extent.
 * @param {number} resolution Resolution.
 * @param {boolean} overlaps The replay can have overlapping geometries.
 * @protected
 * @struct
 */
ol.render.canvas.LineStringReplay = function(tolerance, maxExtent, resolution, overlaps) {

  ol.render.canvas.Replay.call(this, tolerance, maxExtent, resolution, overlaps);

  /**
   * @private
   * @type {{currentStrokeStyle: (string|undefined),
   *         currentLineCap: (string|undefined),
   *         currentLineDash: Array.<number>,
   *         currentLineJoin: (string|undefined),
   *         currentLineWidth: (number|undefined),
   *         currentMiterLimit: (number|undefined),
   *         lastStroke: number,
   *         strokeStyle: (string|undefined),
   *         lineCap: (string|undefined),
   *         lineDash: Array.<number>,
   *         lineJoin: (string|undefined),
   *         lineWidth: (number|undefined),
   *         miterLimit: (number|undefined)}|null}
   */
  this.state_ = {
    currentStrokeStyle: undefined,
    currentLineCap: undefined,
    currentLineDash: null,
    currentLineJoin: undefined,
    currentLineWidth: undefined,
    currentMiterLimit: undefined,
    lastStroke: 0,
    strokeStyle: undefined,
    lineCap: undefined,
    lineDash: null,
    lineJoin: undefined,
    lineWidth: undefined,
    miterLimit: undefined
  };

};
ol.inherits(ol.render.canvas.LineStringReplay, ol.render.canvas.Replay);


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @private
 * @return {number} end.
 */
ol.render.canvas.LineStringReplay.prototype.drawFlatCoordinates_ = function(flatCoordinates, offset, end, stride) {
  var myBegin = this.coordinates.length;
  var myEnd = this.appendFlatCoordinates(
      flatCoordinates, offset, end, stride, false);
  var moveToLineToInstruction =
      [ol.render.canvas.Instruction.MOVE_TO_LINE_TO, myBegin, myEnd];
  this.instructions.push(moveToLineToInstruction);
  this.hitDetectionInstructions.push(moveToLineToInstruction);
  return end;
};


/**
 * @inheritDoc
 */
ol.render.canvas.LineStringReplay.prototype.getBufferedMaxExtent = function() {
  if (!this.bufferedMaxExtent_) {
    this.bufferedMaxExtent_ = ol.extent.clone(this.maxExtent);
    if (this.maxLineWidth > 0) {
      var width = this.resolution * (this.maxLineWidth + 1) / 2;
      ol.extent.buffer(this.bufferedMaxExtent_, width, this.bufferedMaxExtent_);
    }
  }
  return this.bufferedMaxExtent_;
};


/**
 * @private
 */
ol.render.canvas.LineStringReplay.prototype.setStrokeStyle_ = function() {
  var state = this.state_;
  var strokeStyle = state.strokeStyle;
  var lineCap = state.lineCap;
  var lineDash = state.lineDash;
  var lineJoin = state.lineJoin;
  var lineWidth = state.lineWidth;
  var miterLimit = state.miterLimit;
  goog.DEBUG && console.assert(strokeStyle !== undefined,
      'strokeStyle should be defined');
  goog.DEBUG && console.assert(lineCap !== undefined, 'lineCap should be defined');
  goog.DEBUG && console.assert(lineDash, 'lineDash should not be null');
  goog.DEBUG && console.assert(lineJoin !== undefined, 'lineJoin should be defined');
  goog.DEBUG && console.assert(lineWidth !== undefined, 'lineWidth should be defined');
  goog.DEBUG && console.assert(miterLimit !== undefined, 'miterLimit should be defined');
  if (state.currentStrokeStyle != strokeStyle ||
      state.currentLineCap != lineCap ||
      !ol.array.equals(state.currentLineDash, lineDash) ||
      state.currentLineJoin != lineJoin ||
      state.currentLineWidth != lineWidth ||
      state.currentMiterLimit != miterLimit) {
    if (state.lastStroke != this.coordinates.length) {
      this.instructions.push(
          [ol.render.canvas.Instruction.STROKE]);
      state.lastStroke = this.coordinates.length;
    }
    this.instructions.push(
        [ol.render.canvas.Instruction.SET_STROKE_STYLE,
         strokeStyle, lineWidth, lineCap, lineJoin, miterLimit, lineDash],
        [ol.render.canvas.Instruction.BEGIN_PATH]);
    state.currentStrokeStyle = strokeStyle;
    state.currentLineCap = lineCap;
    state.currentLineDash = lineDash;
    state.currentLineJoin = lineJoin;
    state.currentLineWidth = lineWidth;
    state.currentMiterLimit = miterLimit;
  }
};


/**
 * @inheritDoc
 */
ol.render.canvas.LineStringReplay.prototype.drawLineString = function(lineStringGeometry, feature) {
  var state = this.state_;
  goog.DEBUG && console.assert(state, 'state should not be null');
  var strokeStyle = state.strokeStyle;
  var lineWidth = state.lineWidth;
  if (strokeStyle === undefined || lineWidth === undefined) {
    return;
  }
  this.setStrokeStyle_();
  this.beginGeometry(lineStringGeometry, feature);
  this.hitDetectionInstructions.push(
      [ol.render.canvas.Instruction.SET_STROKE_STYLE,
       state.strokeStyle, state.lineWidth, state.lineCap, state.lineJoin,
       state.miterLimit, state.lineDash],
      [ol.render.canvas.Instruction.BEGIN_PATH]);
  var flatCoordinates = lineStringGeometry.getFlatCoordinates();
  var stride = lineStringGeometry.getStride();
  this.drawFlatCoordinates_(
      flatCoordinates, 0, flatCoordinates.length, stride);
  this.hitDetectionInstructions.push([ol.render.canvas.Instruction.STROKE]);
  this.endGeometry(lineStringGeometry, feature);
};


/**
 * @inheritDoc
 */
ol.render.canvas.LineStringReplay.prototype.drawMultiLineString = function(multiLineStringGeometry, feature) {
  var state = this.state_;
  goog.DEBUG && console.assert(state, 'state should not be null');
  var strokeStyle = state.strokeStyle;
  var lineWidth = state.lineWidth;
  if (strokeStyle === undefined || lineWidth === undefined) {
    return;
  }
  this.setStrokeStyle_();
  this.beginGeometry(multiLineStringGeometry, feature);
  this.hitDetectionInstructions.push(
      [ol.render.canvas.Instruction.SET_STROKE_STYLE,
       state.strokeStyle, state.lineWidth, state.lineCap, state.lineJoin,
       state.miterLimit, state.lineDash],
      [ol.render.canvas.Instruction.BEGIN_PATH]);
  var ends = multiLineStringGeometry.getEnds();
  var flatCoordinates = multiLineStringGeometry.getFlatCoordinates();
  var stride = multiLineStringGeometry.getStride();
  var offset = 0;
  var i, ii;
  for (i = 0, ii = ends.length; i < ii; ++i) {
    offset = this.drawFlatCoordinates_(
        flatCoordinates, offset, ends[i], stride);
  }
  this.hitDetectionInstructions.push([ol.render.canvas.Instruction.STROKE]);
  this.endGeometry(multiLineStringGeometry, feature);
};


/**
 * @inheritDoc
 */
ol.render.canvas.LineStringReplay.prototype.finish = function() {
  var state = this.state_;
  goog.DEBUG && console.assert(state, 'state should not be null');
  if (state.lastStroke != this.coordinates.length) {
    this.instructions.push([ol.render.canvas.Instruction.STROKE]);
  }
  this.reverseHitDetectionInstructions_();
  this.state_ = null;
};


/**
 * @inheritDoc
 */
ol.render.canvas.LineStringReplay.prototype.setFillStrokeStyle = function(fillStyle, strokeStyle) {
  goog.DEBUG && console.assert(this.state_, 'this.state_ should not be null');
  goog.DEBUG && console.assert(!fillStyle, 'fillStyle should be null');
  goog.DEBUG && console.assert(strokeStyle, 'strokeStyle should not be null');
  var strokeStyleColor = strokeStyle.getColor();
  this.state_.strokeStyle = ol.color.asString(strokeStyleColor ?
      strokeStyleColor : ol.render.canvas.defaultStrokeStyle);
  var strokeStyleLineCap = strokeStyle.getLineCap();
  this.state_.lineCap = strokeStyleLineCap !== undefined ?
      strokeStyleLineCap : ol.render.canvas.defaultLineCap;
  var strokeStyleLineDash = strokeStyle.getLineDash();
  this.state_.lineDash = strokeStyleLineDash ?
      strokeStyleLineDash : ol.render.canvas.defaultLineDash;
  var strokeStyleLineJoin = strokeStyle.getLineJoin();
  this.state_.lineJoin = strokeStyleLineJoin !== undefined ?
      strokeStyleLineJoin : ol.render.canvas.defaultLineJoin;
  var strokeStyleWidth = strokeStyle.getWidth();
  this.state_.lineWidth = strokeStyleWidth !== undefined ?
      strokeStyleWidth : ol.render.canvas.defaultLineWidth;
  var strokeStyleMiterLimit = strokeStyle.getMiterLimit();
  this.state_.miterLimit = strokeStyleMiterLimit !== undefined ?
      strokeStyleMiterLimit : ol.render.canvas.defaultMiterLimit;

  if (this.state_.lineWidth > this.maxLineWidth) {
    this.maxLineWidth = this.state_.lineWidth;
    // invalidate the buffered max extent cache
    this.bufferedMaxExtent_ = null;
  }
};


/**
 * @constructor
 * @extends {ol.render.canvas.Replay}
 * @param {number} tolerance Tolerance.
 * @param {ol.Extent} maxExtent Maximum extent.
 * @param {number} resolution Resolution.
 * @param {boolean} overlaps The replay can have overlapping geometries.
 * @protected
 * @struct
 */
ol.render.canvas.PolygonReplay = function(tolerance, maxExtent, resolution, overlaps) {

  ol.render.canvas.Replay.call(this, tolerance, maxExtent, resolution, overlaps);

  /**
   * @private
   * @type {{currentFillStyle: (ol.ColorLike|undefined),
   *         currentStrokeStyle: (string|undefined),
   *         currentLineCap: (string|undefined),
   *         currentLineDash: Array.<number>,
   *         currentLineJoin: (string|undefined),
   *         currentLineWidth: (number|undefined),
   *         currentMiterLimit: (number|undefined),
   *         fillStyle: (ol.ColorLike|undefined),
   *         strokeStyle: (string|undefined),
   *         lineCap: (string|undefined),
   *         lineDash: Array.<number>,
   *         lineJoin: (string|undefined),
   *         lineWidth: (number|undefined),
   *         miterLimit: (number|undefined)}|null}
   */
  this.state_ = {
    currentFillStyle: undefined,
    currentStrokeStyle: undefined,
    currentLineCap: undefined,
    currentLineDash: null,
    currentLineJoin: undefined,
    currentLineWidth: undefined,
    currentMiterLimit: undefined,
    fillStyle: undefined,
    strokeStyle: undefined,
    lineCap: undefined,
    lineDash: null,
    lineJoin: undefined,
    lineWidth: undefined,
    miterLimit: undefined
  };

};
ol.inherits(ol.render.canvas.PolygonReplay, ol.render.canvas.Replay);


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array.<number>} ends Ends.
 * @param {number} stride Stride.
 * @private
 * @return {number} End.
 */
ol.render.canvas.PolygonReplay.prototype.drawFlatCoordinatess_ = function(flatCoordinates, offset, ends, stride) {
  var state = this.state_;
  var fill = state.fillStyle !== undefined;
  var stroke = state.strokeStyle != undefined;
  var numEnds = ends.length;
  if (!fill && !stroke) {
    return ends[numEnds - 1];
  }
  var beginPathInstruction = [ol.render.canvas.Instruction.BEGIN_PATH];
  this.instructions.push(beginPathInstruction);
  this.hitDetectionInstructions.push(beginPathInstruction);
  for (var i = 0; i < numEnds; ++i) {
    var end = ends[i];
    var myBegin = this.coordinates.length;
    var myEnd = this.appendFlatCoordinates(
        flatCoordinates, offset, end, stride, true);
    var moveToLineToInstruction =
        [ol.render.canvas.Instruction.MOVE_TO_LINE_TO, myBegin, myEnd];
    this.instructions.push(moveToLineToInstruction);
    this.hitDetectionInstructions.push(moveToLineToInstruction);
    if (stroke) {
      // Performance optimization: only call closePath() when we have a stroke.
      // Otherwise the ring is closed already (see appendFlatCoordinates above).
      var closePathInstruction = [ol.render.canvas.Instruction.CLOSE_PATH];
      this.instructions.push(closePathInstruction);
      this.hitDetectionInstructions.push(closePathInstruction);
    }
    offset = end;
  }
  var fillInstruction = [ol.render.canvas.Instruction.FILL];
  this.hitDetectionInstructions.push(fillInstruction);
  if (fill) {
    this.instructions.push(fillInstruction);
  }
  if (stroke) {
    goog.DEBUG && console.assert(state.lineWidth !== undefined,
        'state.lineWidth should be defined');
    var strokeInstruction = [ol.render.canvas.Instruction.STROKE];
    this.instructions.push(strokeInstruction);
    this.hitDetectionInstructions.push(strokeInstruction);
  }
  return offset;
};


/**
 * @inheritDoc
 */
ol.render.canvas.PolygonReplay.prototype.drawCircle = function(circleGeometry, feature) {
  var state = this.state_;
  goog.DEBUG && console.assert(state, 'state should not be null');
  var fillStyle = state.fillStyle;
  var strokeStyle = state.strokeStyle;
  if (fillStyle === undefined && strokeStyle === undefined) {
    return;
  }
  if (strokeStyle !== undefined) {
    goog.DEBUG && console.assert(state.lineWidth !== undefined,
        'state.lineWidth should be defined');
  }
  this.setFillStrokeStyles_();
  this.beginGeometry(circleGeometry, feature);
  // always fill the circle for hit detection
  this.hitDetectionInstructions.push(
      [ol.render.canvas.Instruction.SET_FILL_STYLE,
       ol.color.asString(ol.render.canvas.defaultFillStyle)]);
  if (state.strokeStyle !== undefined) {
    this.hitDetectionInstructions.push(
        [ol.render.canvas.Instruction.SET_STROKE_STYLE,
         state.strokeStyle, state.lineWidth, state.lineCap, state.lineJoin,
         state.miterLimit, state.lineDash]);
  }
  var flatCoordinates = circleGeometry.getFlatCoordinates();
  var stride = circleGeometry.getStride();
  var myBegin = this.coordinates.length;
  this.appendFlatCoordinates(
      flatCoordinates, 0, flatCoordinates.length, stride, false);
  var beginPathInstruction = [ol.render.canvas.Instruction.BEGIN_PATH];
  var circleInstruction = [ol.render.canvas.Instruction.CIRCLE, myBegin];
  this.instructions.push(beginPathInstruction, circleInstruction);
  this.hitDetectionInstructions.push(beginPathInstruction, circleInstruction);
  var fillInstruction = [ol.render.canvas.Instruction.FILL];
  this.hitDetectionInstructions.push(fillInstruction);
  if (state.fillStyle !== undefined) {
    this.instructions.push(fillInstruction);
  }
  if (state.strokeStyle !== undefined) {
    goog.DEBUG && console.assert(state.lineWidth !== undefined,
        'state.lineWidth should be defined');
    var strokeInstruction = [ol.render.canvas.Instruction.STROKE];
    this.instructions.push(strokeInstruction);
    this.hitDetectionInstructions.push(strokeInstruction);
  }
  this.endGeometry(circleGeometry, feature);
};


/**
 * @inheritDoc
 */
ol.render.canvas.PolygonReplay.prototype.drawPolygon = function(polygonGeometry, feature) {
  var state = this.state_;
  goog.DEBUG && console.assert(state, 'state should not be null');
  var fillStyle = state.fillStyle;
  var strokeStyle = state.strokeStyle;
  if (fillStyle === undefined && strokeStyle === undefined) {
    return;
  }
  if (strokeStyle !== undefined) {
    goog.DEBUG && console.assert(state.lineWidth !== undefined,
        'state.lineWidth should be defined');
  }
  this.setFillStrokeStyles_();
  this.beginGeometry(polygonGeometry, feature);
  // always fill the polygon for hit detection
  this.hitDetectionInstructions.push(
      [ol.render.canvas.Instruction.SET_FILL_STYLE,
       ol.color.asString(ol.render.canvas.defaultFillStyle)]);
  if (state.strokeStyle !== undefined) {
    this.hitDetectionInstructions.push(
        [ol.render.canvas.Instruction.SET_STROKE_STYLE,
         state.strokeStyle, state.lineWidth, state.lineCap, state.lineJoin,
         state.miterLimit, state.lineDash]);
  }
  var ends = polygonGeometry.getEnds();
  var flatCoordinates = polygonGeometry.getOrientedFlatCoordinates();
  var stride = polygonGeometry.getStride();
  this.drawFlatCoordinatess_(flatCoordinates, 0, ends, stride);
  this.endGeometry(polygonGeometry, feature);
};


/**
 * @inheritDoc
 */
ol.render.canvas.PolygonReplay.prototype.drawMultiPolygon = function(multiPolygonGeometry, feature) {
  var state = this.state_;
  goog.DEBUG && console.assert(state, 'state should not be null');
  var fillStyle = state.fillStyle;
  var strokeStyle = state.strokeStyle;
  if (fillStyle === undefined && strokeStyle === undefined) {
    return;
  }
  if (strokeStyle !== undefined) {
    goog.DEBUG && console.assert(state.lineWidth !== undefined,
        'state.lineWidth should be defined');
  }
  this.setFillStrokeStyles_();
  this.beginGeometry(multiPolygonGeometry, feature);
  // always fill the multi-polygon for hit detection
  this.hitDetectionInstructions.push(
      [ol.render.canvas.Instruction.SET_FILL_STYLE,
       ol.color.asString(ol.render.canvas.defaultFillStyle)]);
  if (state.strokeStyle !== undefined) {
    this.hitDetectionInstructions.push(
        [ol.render.canvas.Instruction.SET_STROKE_STYLE,
         state.strokeStyle, state.lineWidth, state.lineCap, state.lineJoin,
         state.miterLimit, state.lineDash]);
  }
  var endss = multiPolygonGeometry.getEndss();
  var flatCoordinates = multiPolygonGeometry.getOrientedFlatCoordinates();
  var stride = multiPolygonGeometry.getStride();
  var offset = 0;
  var i, ii;
  for (i = 0, ii = endss.length; i < ii; ++i) {
    offset = this.drawFlatCoordinatess_(
        flatCoordinates, offset, endss[i], stride);
  }
  this.endGeometry(multiPolygonGeometry, feature);
};


/**
 * @inheritDoc
 */
ol.render.canvas.PolygonReplay.prototype.finish = function() {
  goog.DEBUG && console.assert(this.state_, 'this.state_ should not be null');
  this.reverseHitDetectionInstructions_();
  this.state_ = null;
  // We want to preserve topology when drawing polygons.  Polygons are
  // simplified using quantization and point elimination. However, we might
  // have received a mix of quantized and non-quantized geometries, so ensure
  // that all are quantized by quantizing all coordinates in the batch.
  var tolerance = this.tolerance;
  if (tolerance !== 0) {
    var coordinates = this.coordinates;
    var i, ii;
    for (i = 0, ii = coordinates.length; i < ii; ++i) {
      coordinates[i] = ol.geom.flat.simplify.snap(coordinates[i], tolerance);
    }
  }
};


/**
 * @inheritDoc
 */
ol.render.canvas.PolygonReplay.prototype.getBufferedMaxExtent = function() {
  if (!this.bufferedMaxExtent_) {
    this.bufferedMaxExtent_ = ol.extent.clone(this.maxExtent);
    if (this.maxLineWidth > 0) {
      var width = this.resolution * (this.maxLineWidth + 1) / 2;
      ol.extent.buffer(this.bufferedMaxExtent_, width, this.bufferedMaxExtent_);
    }
  }
  return this.bufferedMaxExtent_;
};


/**
 * @inheritDoc
 */
ol.render.canvas.PolygonReplay.prototype.setFillStrokeStyle = function(fillStyle, strokeStyle) {
  goog.DEBUG && console.assert(this.state_, 'this.state_ should not be null');
  goog.DEBUG && console.assert(fillStyle || strokeStyle,
      'fillStyle or strokeStyle should not be null');
  var state = this.state_;
  if (fillStyle) {
    var fillStyleColor = fillStyle.getColor();
    state.fillStyle = ol.colorlike.asColorLike(fillStyleColor ?
        fillStyleColor : ol.render.canvas.defaultFillStyle);
  } else {
    state.fillStyle = undefined;
  }
  if (strokeStyle) {
    var strokeStyleColor = strokeStyle.getColor();
    state.strokeStyle = ol.color.asString(strokeStyleColor ?
        strokeStyleColor : ol.render.canvas.defaultStrokeStyle);
    var strokeStyleLineCap = strokeStyle.getLineCap();
    state.lineCap = strokeStyleLineCap !== undefined ?
        strokeStyleLineCap : ol.render.canvas.defaultLineCap;
    var strokeStyleLineDash = strokeStyle.getLineDash();
    state.lineDash = strokeStyleLineDash ?
        strokeStyleLineDash.slice() : ol.render.canvas.defaultLineDash;
    var strokeStyleLineJoin = strokeStyle.getLineJoin();
    state.lineJoin = strokeStyleLineJoin !== undefined ?
        strokeStyleLineJoin : ol.render.canvas.defaultLineJoin;
    var strokeStyleWidth = strokeStyle.getWidth();
    state.lineWidth = strokeStyleWidth !== undefined ?
        strokeStyleWidth : ol.render.canvas.defaultLineWidth;
    var strokeStyleMiterLimit = strokeStyle.getMiterLimit();
    state.miterLimit = strokeStyleMiterLimit !== undefined ?
        strokeStyleMiterLimit : ol.render.canvas.defaultMiterLimit;

    if (state.lineWidth > this.maxLineWidth) {
      this.maxLineWidth = state.lineWidth;
      // invalidate the buffered max extent cache
      this.bufferedMaxExtent_ = null;
    }
  } else {
    state.strokeStyle = undefined;
    state.lineCap = undefined;
    state.lineDash = null;
    state.lineJoin = undefined;
    state.lineWidth = undefined;
    state.miterLimit = undefined;
  }
};


/**
 * @private
 */
ol.render.canvas.PolygonReplay.prototype.setFillStrokeStyles_ = function() {
  var state = this.state_;
  var fillStyle = state.fillStyle;
  var strokeStyle = state.strokeStyle;
  var lineCap = state.lineCap;
  var lineDash = state.lineDash;
  var lineJoin = state.lineJoin;
  var lineWidth = state.lineWidth;
  var miterLimit = state.miterLimit;
  if (fillStyle !== undefined && state.currentFillStyle != fillStyle) {
    this.instructions.push(
        [ol.render.canvas.Instruction.SET_FILL_STYLE, fillStyle]);
    state.currentFillStyle = state.fillStyle;
  }
  if (strokeStyle !== undefined) {
    goog.DEBUG && console.assert(lineCap !== undefined, 'lineCap should be defined');
    goog.DEBUG && console.assert(lineDash, 'lineDash should not be null');
    goog.DEBUG && console.assert(lineJoin !== undefined, 'lineJoin should be defined');
    goog.DEBUG && console.assert(lineWidth !== undefined, 'lineWidth should be defined');
    goog.DEBUG && console.assert(miterLimit !== undefined,
        'miterLimit should be defined');
    if (state.currentStrokeStyle != strokeStyle ||
        state.currentLineCap != lineCap ||
        state.currentLineDash != lineDash ||
        state.currentLineJoin != lineJoin ||
        state.currentLineWidth != lineWidth ||
        state.currentMiterLimit != miterLimit) {
      this.instructions.push(
          [ol.render.canvas.Instruction.SET_STROKE_STYLE,
           strokeStyle, lineWidth, lineCap, lineJoin, miterLimit, lineDash]);
      state.currentStrokeStyle = strokeStyle;
      state.currentLineCap = lineCap;
      state.currentLineDash = lineDash;
      state.currentLineJoin = lineJoin;
      state.currentLineWidth = lineWidth;
      state.currentMiterLimit = miterLimit;
    }
  }
};


/**
 * @constructor
 * @extends {ol.render.canvas.Replay}
 * @param {number} tolerance Tolerance.
 * @param {ol.Extent} maxExtent Maximum extent.
 * @param {number} resolution Resolution.
 * @param {boolean} overlaps The replay can have overlapping geometries.
 * @protected
 * @struct
 */
ol.render.canvas.TextReplay = function(tolerance, maxExtent, resolution, overlaps) {

  ol.render.canvas.Replay.call(this, tolerance, maxExtent, resolution, overlaps);

  /**
   * @private
   * @type {?ol.CanvasFillState}
   */
  this.replayFillState_ = null;

  /**
   * @private
   * @type {?ol.CanvasStrokeState}
   */
  this.replayStrokeState_ = null;

  /**
   * @private
   * @type {?ol.CanvasTextState}
   */
  this.replayTextState_ = null;

  /**
   * @private
   * @type {string}
   */
  this.text_ = '';

  /**
   * @private
   * @type {number}
   */
  this.textOffsetX_ = 0;

  /**
   * @private
   * @type {number}
   */
  this.textOffsetY_ = 0;

  /**
   * @private
   * @type {boolean|undefined}
   */
  this.textRotateWithView_ = undefined;

  /**
   * @private
   * @type {number}
   */
  this.textRotation_ = 0;

  /**
   * @private
   * @type {number}
   */
  this.textScale_ = 0;

  /**
   * @private
   * @type {?ol.CanvasFillState}
   */
  this.textFillState_ = null;

  /**
   * @private
   * @type {?ol.CanvasStrokeState}
   */
  this.textStrokeState_ = null;

  /**
   * @private
   * @type {?ol.CanvasTextState}
   */
  this.textState_ = null;

};
ol.inherits(ol.render.canvas.TextReplay, ol.render.canvas.Replay);


/**
 * @inheritDoc
 */
ol.render.canvas.TextReplay.prototype.drawText = function(flatCoordinates, offset, end, stride, geometry, feature) {
  if (this.text_ === '' || !this.textState_ ||
      (!this.textFillState_ && !this.textStrokeState_)) {
    return;
  }
  if (this.textFillState_) {
    this.setReplayFillState_(this.textFillState_);
  }
  if (this.textStrokeState_) {
    this.setReplayStrokeState_(this.textStrokeState_);
  }
  this.setReplayTextState_(this.textState_);
  this.beginGeometry(geometry, feature);
  var myBegin = this.coordinates.length;
  var myEnd =
      this.appendFlatCoordinates(flatCoordinates, offset, end, stride, false);
  var fill = !!this.textFillState_;
  var stroke = !!this.textStrokeState_;
  var drawTextInstruction = [
    ol.render.canvas.Instruction.DRAW_TEXT, myBegin, myEnd, this.text_,
    this.textOffsetX_, this.textOffsetY_, this.textRotation_, this.textScale_,
    fill, stroke, this.textRotateWithView_];
  this.instructions.push(drawTextInstruction);
  this.hitDetectionInstructions.push(drawTextInstruction);
  this.endGeometry(geometry, feature);
};


/**
 * @param {ol.CanvasFillState} fillState Fill state.
 * @private
 */
ol.render.canvas.TextReplay.prototype.setReplayFillState_ = function(fillState) {
  var replayFillState = this.replayFillState_;
  if (replayFillState &&
      replayFillState.fillStyle == fillState.fillStyle) {
    return;
  }
  var setFillStyleInstruction =
      [ol.render.canvas.Instruction.SET_FILL_STYLE, fillState.fillStyle];
  this.instructions.push(setFillStyleInstruction);
  this.hitDetectionInstructions.push(setFillStyleInstruction);
  if (!replayFillState) {
    this.replayFillState_ = {
      fillStyle: fillState.fillStyle
    };
  } else {
    replayFillState.fillStyle = fillState.fillStyle;
  }
};


/**
 * @param {ol.CanvasStrokeState} strokeState Stroke state.
 * @private
 */
ol.render.canvas.TextReplay.prototype.setReplayStrokeState_ = function(strokeState) {
  var replayStrokeState = this.replayStrokeState_;
  if (replayStrokeState &&
      replayStrokeState.lineCap == strokeState.lineCap &&
      replayStrokeState.lineDash == strokeState.lineDash &&
      replayStrokeState.lineJoin == strokeState.lineJoin &&
      replayStrokeState.lineWidth == strokeState.lineWidth &&
      replayStrokeState.miterLimit == strokeState.miterLimit &&
      replayStrokeState.strokeStyle == strokeState.strokeStyle) {
    return;
  }
  var setStrokeStyleInstruction = [
    ol.render.canvas.Instruction.SET_STROKE_STYLE, strokeState.strokeStyle,
    strokeState.lineWidth, strokeState.lineCap, strokeState.lineJoin,
    strokeState.miterLimit, strokeState.lineDash, false
  ];
  this.instructions.push(setStrokeStyleInstruction);
  this.hitDetectionInstructions.push(setStrokeStyleInstruction);
  if (!replayStrokeState) {
    this.replayStrokeState_ = {
      lineCap: strokeState.lineCap,
      lineDash: strokeState.lineDash,
      lineJoin: strokeState.lineJoin,
      lineWidth: strokeState.lineWidth,
      miterLimit: strokeState.miterLimit,
      strokeStyle: strokeState.strokeStyle
    };
  } else {
    replayStrokeState.lineCap = strokeState.lineCap;
    replayStrokeState.lineDash = strokeState.lineDash;
    replayStrokeState.lineJoin = strokeState.lineJoin;
    replayStrokeState.lineWidth = strokeState.lineWidth;
    replayStrokeState.miterLimit = strokeState.miterLimit;
    replayStrokeState.strokeStyle = strokeState.strokeStyle;
  }
};


/**
 * @param {ol.CanvasTextState} textState Text state.
 * @private
 */
ol.render.canvas.TextReplay.prototype.setReplayTextState_ = function(textState) {
  var replayTextState = this.replayTextState_;
  if (replayTextState &&
      replayTextState.font == textState.font &&
      replayTextState.textAlign == textState.textAlign &&
      replayTextState.textBaseline == textState.textBaseline) {
    return;
  }
  var setTextStyleInstruction = [ol.render.canvas.Instruction.SET_TEXT_STYLE,
    textState.font, textState.textAlign, textState.textBaseline];
  this.instructions.push(setTextStyleInstruction);
  this.hitDetectionInstructions.push(setTextStyleInstruction);
  if (!replayTextState) {
    this.replayTextState_ = {
      font: textState.font,
      textAlign: textState.textAlign,
      textBaseline: textState.textBaseline
    };
  } else {
    replayTextState.font = textState.font;
    replayTextState.textAlign = textState.textAlign;
    replayTextState.textBaseline = textState.textBaseline;
  }
};


/**
 * @inheritDoc
 */
ol.render.canvas.TextReplay.prototype.setTextStyle = function(textStyle) {
  if (!textStyle) {
    this.text_ = '';
  } else {
    var textFillStyle = textStyle.getFill();
    if (!textFillStyle) {
      this.textFillState_ = null;
    } else {
      var textFillStyleColor = textFillStyle.getColor();
      var fillStyle = ol.colorlike.asColorLike(textFillStyleColor ?
          textFillStyleColor : ol.render.canvas.defaultFillStyle);
      if (!this.textFillState_) {
        this.textFillState_ = {
          fillStyle: fillStyle
        };
      } else {
        var textFillState = this.textFillState_;
        textFillState.fillStyle = fillStyle;
      }
    }
    var textStrokeStyle = textStyle.getStroke();
    if (!textStrokeStyle) {
      this.textStrokeState_ = null;
    } else {
      var textStrokeStyleColor = textStrokeStyle.getColor();
      var textStrokeStyleLineCap = textStrokeStyle.getLineCap();
      var textStrokeStyleLineDash = textStrokeStyle.getLineDash();
      var textStrokeStyleLineJoin = textStrokeStyle.getLineJoin();
      var textStrokeStyleWidth = textStrokeStyle.getWidth();
      var textStrokeStyleMiterLimit = textStrokeStyle.getMiterLimit();
      var lineCap = textStrokeStyleLineCap !== undefined ?
          textStrokeStyleLineCap : ol.render.canvas.defaultLineCap;
      var lineDash = textStrokeStyleLineDash ?
          textStrokeStyleLineDash.slice() : ol.render.canvas.defaultLineDash;
      var lineJoin = textStrokeStyleLineJoin !== undefined ?
          textStrokeStyleLineJoin : ol.render.canvas.defaultLineJoin;
      var lineWidth = textStrokeStyleWidth !== undefined ?
          textStrokeStyleWidth : ol.render.canvas.defaultLineWidth;
      var miterLimit = textStrokeStyleMiterLimit !== undefined ?
          textStrokeStyleMiterLimit : ol.render.canvas.defaultMiterLimit;
      var strokeStyle = ol.color.asString(textStrokeStyleColor ?
          textStrokeStyleColor : ol.render.canvas.defaultStrokeStyle);
      if (!this.textStrokeState_) {
        this.textStrokeState_ = {
          lineCap: lineCap,
          lineDash: lineDash,
          lineJoin: lineJoin,
          lineWidth: lineWidth,
          miterLimit: miterLimit,
          strokeStyle: strokeStyle
        };
      } else {
        var textStrokeState = this.textStrokeState_;
        textStrokeState.lineCap = lineCap;
        textStrokeState.lineDash = lineDash;
        textStrokeState.lineJoin = lineJoin;
        textStrokeState.lineWidth = lineWidth;
        textStrokeState.miterLimit = miterLimit;
        textStrokeState.strokeStyle = strokeStyle;
      }
    }
    var textFont = textStyle.getFont();
    var textOffsetX = textStyle.getOffsetX();
    var textOffsetY = textStyle.getOffsetY();
    var textRotateWithView = textStyle.getRotateWithView();
    var textRotation = textStyle.getRotation();
    var textScale = textStyle.getScale();
    var textText = textStyle.getText();
    var textTextAlign = textStyle.getTextAlign();
    var textTextBaseline = textStyle.getTextBaseline();
    var font = textFont !== undefined ?
        textFont : ol.render.canvas.defaultFont;
    var textAlign = textTextAlign !== undefined ?
        textTextAlign : ol.render.canvas.defaultTextAlign;
    var textBaseline = textTextBaseline !== undefined ?
        textTextBaseline : ol.render.canvas.defaultTextBaseline;
    if (!this.textState_) {
      this.textState_ = {
        font: font,
        textAlign: textAlign,
        textBaseline: textBaseline
      };
    } else {
      var textState = this.textState_;
      textState.font = font;
      textState.textAlign = textAlign;
      textState.textBaseline = textBaseline;
    }
    this.text_ = textText !== undefined ? textText : '';
    this.textOffsetX_ = textOffsetX !== undefined ? textOffsetX : 0;
    this.textOffsetY_ = textOffsetY !== undefined ? textOffsetY : 0;
    this.textRotateWithView_ = textRotateWithView !== undefined ? textRotateWithView : false;
    this.textRotation_ = textRotation !== undefined ? textRotation : 0;
    this.textScale_ = textScale !== undefined ? textScale : 1;
  }
};


/**
 * @constructor
 * @extends {ol.render.ReplayGroup}
 * @param {number} tolerance Tolerance.
 * @param {ol.Extent} maxExtent Max extent.
 * @param {number} resolution Resolution.
 * @param {boolean} overlaps The replay group can have overlapping geometries.
 * @param {number=} opt_renderBuffer Optional rendering buffer.
 * @struct
 */
ol.render.canvas.ReplayGroup = function(
    tolerance, maxExtent, resolution, overlaps, opt_renderBuffer) {
  ol.render.ReplayGroup.call(this);

  /**
   * @private
   * @type {number}
   */
  this.tolerance_ = tolerance;

  /**
   * @private
   * @type {ol.Extent}
   */
  this.maxExtent_ = maxExtent;

  /**
   * @private
   * @type {boolean}
   */
  this.overlaps_ = overlaps;

  /**
   * @private
   * @type {number}
   */
  this.resolution_ = resolution;

  /**
   * @private
   * @type {number|undefined}
   */
  this.renderBuffer_ = opt_renderBuffer;

  /**
   * @private
   * @type {!Object.<string,
   *        Object.<ol.render.ReplayType, ol.render.canvas.Replay>>}
   */
  this.replaysByZIndex_ = {};

  /**
   * @private
   * @type {CanvasRenderingContext2D}
   */
  this.hitDetectionContext_ = ol.dom.createCanvasContext2D(1, 1);

  /**
   * @private
   * @type {ol.Transform}
   */
  this.hitDetectionTransform_ = ol.transform.create();

};
ol.inherits(ol.render.canvas.ReplayGroup, ol.render.ReplayGroup);


/**
 * FIXME empty description for jsdoc
 */
ol.render.canvas.ReplayGroup.prototype.finish = function() {
  var zKey;
  for (zKey in this.replaysByZIndex_) {
    var replays = this.replaysByZIndex_[zKey];
    var replayKey;
    for (replayKey in replays) {
      replays[replayKey].finish();
    }
  }
};


/**
 * @param {ol.Coordinate} coordinate Coordinate.
 * @param {number} resolution Resolution.
 * @param {number} rotation Rotation.
 * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
 *     to skip.
 * @param {function((ol.Feature|ol.render.Feature)): T} callback Feature
 *     callback.
 * @return {T|undefined} Callback result.
 * @template T
 */
ol.render.canvas.ReplayGroup.prototype.forEachFeatureAtCoordinate = function(
    coordinate, resolution, rotation, skippedFeaturesHash, callback) {

  var transform = ol.transform.compose(this.hitDetectionTransform_,
      0.5, 0.5,
      1 / resolution, -1 / resolution,
      -rotation,
      -coordinate[0], -coordinate[1]);

  var context = this.hitDetectionContext_;
  context.clearRect(0, 0, 1, 1);

  /**
   * @type {ol.Extent}
   */
  var hitExtent;
  if (this.renderBuffer_ !== undefined) {
    hitExtent = ol.extent.createEmpty();
    ol.extent.extendCoordinate(hitExtent, coordinate);
    ol.extent.buffer(hitExtent, resolution * this.renderBuffer_, hitExtent);
  }

  return this.replayHitDetection_(context, transform, rotation,
      skippedFeaturesHash,
      /**
       * @param {ol.Feature|ol.render.Feature} feature Feature.
       * @return {?} Callback result.
       */
      function(feature) {
        var imageData = context.getImageData(0, 0, 1, 1).data;
        if (imageData[3] > 0) {
          var result = callback(feature);
          if (result) {
            return result;
          }
          context.clearRect(0, 0, 1, 1);
        }
      }, hitExtent);
};


/**
 * @inheritDoc
 */
ol.render.canvas.ReplayGroup.prototype.getReplay = function(zIndex, replayType) {
  var zIndexKey = zIndex !== undefined ? zIndex.toString() : '0';
  var replays = this.replaysByZIndex_[zIndexKey];
  if (replays === undefined) {
    replays = {};
    this.replaysByZIndex_[zIndexKey] = replays;
  }
  var replay = replays[replayType];
  if (replay === undefined) {
    var Constructor = ol.render.canvas.BATCH_CONSTRUCTORS_[replayType];
    goog.DEBUG && console.assert(Constructor !== undefined,
        replayType +
        ' constructor missing from ol.render.canvas.BATCH_CONSTRUCTORS_');
    replay = new Constructor(this.tolerance_, this.maxExtent_,
        this.resolution_, this.overlaps_);
    replays[replayType] = replay;
  }
  return replay;
};


/**
 * @inheritDoc
 */
ol.render.canvas.ReplayGroup.prototype.isEmpty = function() {
  return ol.obj.isEmpty(this.replaysByZIndex_);
};


/**
 * @param {CanvasRenderingContext2D} context Context.
 * @param {number} pixelRatio Pixel ratio.
 * @param {ol.Transform} transform Transform.
 * @param {number} viewRotation View rotation.
 * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
 *     to skip.
 * @param {Array.<ol.render.ReplayType>=} opt_replayTypes Ordered replay types
 *     to replay. Default is {@link ol.render.replay.ORDER}
 */
ol.render.canvas.ReplayGroup.prototype.replay = function(context, pixelRatio,
    transform, viewRotation, skippedFeaturesHash, opt_replayTypes) {

  /** @type {Array.<number>} */
  var zs = Object.keys(this.replaysByZIndex_).map(Number);
  zs.sort(ol.array.numberSafeCompareFunction);

  // setup clipping so that the parts of over-simplified geometries are not
  // visible outside the current extent when panning
  var maxExtent = this.maxExtent_;
  var minX = maxExtent[0];
  var minY = maxExtent[1];
  var maxX = maxExtent[2];
  var maxY = maxExtent[3];
  var flatClipCoords = [minX, minY, minX, maxY, maxX, maxY, maxX, minY];
  ol.geom.flat.transform.transform2D(
      flatClipCoords, 0, 8, 2, transform, flatClipCoords);
  context.save();
  context.beginPath();
  context.moveTo(flatClipCoords[0], flatClipCoords[1]);
  context.lineTo(flatClipCoords[2], flatClipCoords[3]);
  context.lineTo(flatClipCoords[4], flatClipCoords[5]);
  context.lineTo(flatClipCoords[6], flatClipCoords[7]);
  context.clip();

  var replayTypes = opt_replayTypes ? opt_replayTypes : ol.render.replay.ORDER;
  var i, ii, j, jj, replays, replay;
  for (i = 0, ii = zs.length; i < ii; ++i) {
    replays = this.replaysByZIndex_[zs[i].toString()];
    for (j = 0, jj = replayTypes.length; j < jj; ++j) {
      replay = replays[replayTypes[j]];
      if (replay !== undefined) {
        replay.replay(context, pixelRatio, transform, viewRotation,
            skippedFeaturesHash);
      }
    }
  }

  context.restore();
};


/**
 * @private
 * @param {CanvasRenderingContext2D} context Context.
 * @param {ol.Transform} transform Transform.
 * @param {number} viewRotation View rotation.
 * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
 *     to skip.
 * @param {function((ol.Feature|ol.render.Feature)): T} featureCallback
 *     Feature callback.
 * @param {ol.Extent=} opt_hitExtent Only check features that intersect this
 *     extent.
 * @return {T|undefined} Callback result.
 * @template T
 */
ol.render.canvas.ReplayGroup.prototype.replayHitDetection_ = function(
    context, transform, viewRotation, skippedFeaturesHash,
    featureCallback, opt_hitExtent) {
  /** @type {Array.<number>} */
  var zs = Object.keys(this.replaysByZIndex_).map(Number);
  zs.sort(function(a, b) {
    return b - a;
  });

  var i, ii, j, replays, replay, result;
  for (i = 0, ii = zs.length; i < ii; ++i) {
    replays = this.replaysByZIndex_[zs[i].toString()];
    for (j = ol.render.replay.ORDER.length - 1; j >= 0; --j) {
      replay = replays[ol.render.replay.ORDER[j]];
      if (replay !== undefined) {
        result = replay.replayHitDetection(context, transform, viewRotation,
            skippedFeaturesHash, featureCallback, opt_hitExtent);
        if (result) {
          return result;
        }
      }
    }
  }
  return undefined;
};


/**
 * @const
 * @private
 * @type {Object.<ol.render.ReplayType,
 *                function(new: ol.render.canvas.Replay, number, ol.Extent,
 *                number, boolean)>}
 */
ol.render.canvas.BATCH_CONSTRUCTORS_ = {
  'Image': ol.render.canvas.ImageReplay,
  'LineString': ol.render.canvas.LineStringReplay,
  'Polygon': ol.render.canvas.PolygonReplay,
  'Text': ol.render.canvas.TextReplay
};

goog.provide('ol.renderer.vector');

goog.require('ol');
goog.require('ol.render.ReplayType');
goog.require('ol.style.ImageState');


/**
 * @param {ol.Feature|ol.render.Feature} feature1 Feature 1.
 * @param {ol.Feature|ol.render.Feature} feature2 Feature 2.
 * @return {number} Order.
 */
ol.renderer.vector.defaultOrder = function(feature1, feature2) {
  return ol.getUid(feature1) - ol.getUid(feature2);
};


/**
 * @param {number} resolution Resolution.
 * @param {number} pixelRatio Pixel ratio.
 * @return {number} Squared pixel tolerance.
 */
ol.renderer.vector.getSquaredTolerance = function(resolution, pixelRatio) {
  var tolerance = ol.renderer.vector.getTolerance(resolution, pixelRatio);
  return tolerance * tolerance;
};


/**
 * @param {number} resolution Resolution.
 * @param {number} pixelRatio Pixel ratio.
 * @return {number} Pixel tolerance.
 */
ol.renderer.vector.getTolerance = function(resolution, pixelRatio) {
  return ol.SIMPLIFY_TOLERANCE * resolution / pixelRatio;
};


/**
 * @param {ol.render.ReplayGroup} replayGroup Replay group.
 * @param {ol.geom.Circle} geometry Geometry.
 * @param {ol.style.Style} style Style.
 * @param {ol.Feature} feature Feature.
 * @private
 */
ol.renderer.vector.renderCircleGeometry_ = function(replayGroup, geometry, style, feature) {
  var fillStyle = style.getFill();
  var strokeStyle = style.getStroke();
  if (fillStyle || strokeStyle) {
    var polygonReplay = replayGroup.getReplay(
        style.getZIndex(), ol.render.ReplayType.POLYGON);
    polygonReplay.setFillStrokeStyle(fillStyle, strokeStyle);
    polygonReplay.drawCircle(geometry, feature);
  }
  var textStyle = style.getText();
  if (textStyle) {
    var textReplay = replayGroup.getReplay(
        style.getZIndex(), ol.render.ReplayType.TEXT);
    textReplay.setTextStyle(textStyle);
    textReplay.drawText(geometry.getCenter(), 0, 2, 2, geometry, feature);
  }
};


/**
 * @param {ol.render.ReplayGroup} replayGroup Replay group.
 * @param {ol.Feature|ol.render.Feature} feature Feature.
 * @param {ol.style.Style} style Style.
 * @param {number} squaredTolerance Squared tolerance.
 * @param {function(this: T, ol.events.Event)} listener Listener function.
 * @param {T} thisArg Value to use as `this` when executing `listener`.
 * @return {boolean} `true` if style is loading.
 * @template T
 */
ol.renderer.vector.renderFeature = function(
    replayGroup, feature, style, squaredTolerance, listener, thisArg) {
  var loading = false;
  var imageStyle, imageState;
  imageStyle = style.getImage();
  if (imageStyle) {
    imageState = imageStyle.getImageState();
    if (imageState == ol.style.ImageState.LOADED ||
        imageState == ol.style.ImageState.ERROR) {
      imageStyle.unlistenImageChange(listener, thisArg);
    } else {
      if (imageState == ol.style.ImageState.IDLE) {
        imageStyle.load();
      }
      imageState = imageStyle.getImageState();
      goog.DEBUG && console.assert(imageState == ol.style.ImageState.LOADING,
          'imageState should be LOADING');
      imageStyle.listenImageChange(listener, thisArg);
      loading = true;
    }
  }
  ol.renderer.vector.renderFeature_(replayGroup, feature, style,
      squaredTolerance);
  return loading;
};


/**
 * @param {ol.render.ReplayGroup} replayGroup Replay group.
 * @param {ol.Feature|ol.render.Feature} feature Feature.
 * @param {ol.style.Style} style Style.
 * @param {number} squaredTolerance Squared tolerance.
 * @private
 */
ol.renderer.vector.renderFeature_ = function(
    replayGroup, feature, style, squaredTolerance) {
  var geometry = style.getGeometryFunction()(feature);
  if (!geometry) {
    return;
  }
  var simplifiedGeometry = geometry.getSimplifiedGeometry(squaredTolerance);
  var geometryRenderer =
      ol.renderer.vector.GEOMETRY_RENDERERS_[simplifiedGeometry.getType()];
  geometryRenderer(replayGroup, simplifiedGeometry, style, feature);
};


/**
 * @param {ol.render.ReplayGroup} replayGroup Replay group.
 * @param {ol.geom.GeometryCollection} geometry Geometry.
 * @param {ol.style.Style} style Style.
 * @param {ol.Feature} feature Feature.
 * @private
 */
ol.renderer.vector.renderGeometryCollectionGeometry_ = function(replayGroup, geometry, style, feature) {
  var geometries = geometry.getGeometriesArray();
  var i, ii;
  for (i = 0, ii = geometries.length; i < ii; ++i) {
    var geometryRenderer =
        ol.renderer.vector.GEOMETRY_RENDERERS_[geometries[i].getType()];
    geometryRenderer(replayGroup, geometries[i], style, feature);
  }
};


/**
 * @param {ol.render.ReplayGroup} replayGroup Replay group.
 * @param {ol.geom.LineString|ol.render.Feature} geometry Geometry.
 * @param {ol.style.Style} style Style.
 * @param {ol.Feature|ol.render.Feature} feature Feature.
 * @private
 */
ol.renderer.vector.renderLineStringGeometry_ = function(replayGroup, geometry, style, feature) {
  var strokeStyle = style.getStroke();
  if (strokeStyle) {
    var lineStringReplay = replayGroup.getReplay(
        style.getZIndex(), ol.render.ReplayType.LINE_STRING);
    lineStringReplay.setFillStrokeStyle(null, strokeStyle);
    lineStringReplay.drawLineString(geometry, feature);
  }
  var textStyle = style.getText();
  if (textStyle) {
    var textReplay = replayGroup.getReplay(
        style.getZIndex(), ol.render.ReplayType.TEXT);
    textReplay.setTextStyle(textStyle);
    textReplay.drawText(geometry.getFlatMidpoint(), 0, 2, 2, geometry, feature);
  }
};


/**
 * @param {ol.render.ReplayGroup} replayGroup Replay group.
 * @param {ol.geom.MultiLineString|ol.render.Feature} geometry Geometry.
 * @param {ol.style.Style} style Style.
 * @param {ol.Feature|ol.render.Feature} feature Feature.
 * @private
 */
ol.renderer.vector.renderMultiLineStringGeometry_ = function(replayGroup, geometry, style, feature) {
  var strokeStyle = style.getStroke();
  if (strokeStyle) {
    var lineStringReplay = replayGroup.getReplay(
        style.getZIndex(), ol.render.ReplayType.LINE_STRING);
    lineStringReplay.setFillStrokeStyle(null, strokeStyle);
    lineStringReplay.drawMultiLineString(geometry, feature);
  }
  var textStyle = style.getText();
  if (textStyle) {
    var textReplay = replayGroup.getReplay(
        style.getZIndex(), ol.render.ReplayType.TEXT);
    textReplay.setTextStyle(textStyle);
    var flatMidpointCoordinates = geometry.getFlatMidpoints();
    textReplay.drawText(flatMidpointCoordinates, 0,
        flatMidpointCoordinates.length, 2, geometry, feature);
  }
};


/**
 * @param {ol.render.ReplayGroup} replayGroup Replay group.
 * @param {ol.geom.MultiPolygon} geometry Geometry.
 * @param {ol.style.Style} style Style.
 * @param {ol.Feature} feature Feature.
 * @private
 */
ol.renderer.vector.renderMultiPolygonGeometry_ = function(replayGroup, geometry, style, feature) {
  var fillStyle = style.getFill();
  var strokeStyle = style.getStroke();
  if (strokeStyle || fillStyle) {
    var polygonReplay = replayGroup.getReplay(
        style.getZIndex(), ol.render.ReplayType.POLYGON);
    polygonReplay.setFillStrokeStyle(fillStyle, strokeStyle);
    polygonReplay.drawMultiPolygon(geometry, feature);
  }
  var textStyle = style.getText();
  if (textStyle) {
    var textReplay = replayGroup.getReplay(
        style.getZIndex(), ol.render.ReplayType.TEXT);
    textReplay.setTextStyle(textStyle);
    var flatInteriorPointCoordinates = geometry.getFlatInteriorPoints();
    textReplay.drawText(flatInteriorPointCoordinates, 0,
        flatInteriorPointCoordinates.length, 2, geometry, feature);
  }
};


/**
 * @param {ol.render.ReplayGroup} replayGroup Replay group.
 * @param {ol.geom.Point|ol.render.Feature} geometry Geometry.
 * @param {ol.style.Style} style Style.
 * @param {ol.Feature|ol.render.Feature} feature Feature.
 * @private
 */
ol.renderer.vector.renderPointGeometry_ = function(replayGroup, geometry, style, feature) {
  var imageStyle = style.getImage();
  if (imageStyle) {
    if (imageStyle.getImageState() != ol.style.ImageState.LOADED) {
      return;
    }
    var imageReplay = replayGroup.getReplay(
        style.getZIndex(), ol.render.ReplayType.IMAGE);
    imageReplay.setImageStyle(imageStyle);
    imageReplay.drawPoint(geometry, feature);
  }
  var textStyle = style.getText();
  if (textStyle) {
    var textReplay = replayGroup.getReplay(
        style.getZIndex(), ol.render.ReplayType.TEXT);
    textReplay.setTextStyle(textStyle);
    textReplay.drawText(geometry.getFlatCoordinates(), 0, 2, 2, geometry,
        feature);
  }
};


/**
 * @param {ol.render.ReplayGroup} replayGroup Replay group.
 * @param {ol.geom.MultiPoint|ol.render.Feature} geometry Geometry.
 * @param {ol.style.Style} style Style.
 * @param {ol.Feature|ol.render.Feature} feature Feature.
 * @private
 */
ol.renderer.vector.renderMultiPointGeometry_ = function(replayGroup, geometry, style, feature) {
  var imageStyle = style.getImage();
  if (imageStyle) {
    if (imageStyle.getImageState() != ol.style.ImageState.LOADED) {
      return;
    }
    var imageReplay = replayGroup.getReplay(
        style.getZIndex(), ol.render.ReplayType.IMAGE);
    imageReplay.setImageStyle(imageStyle);
    imageReplay.drawMultiPoint(geometry, feature);
  }
  var textStyle = style.getText();
  if (textStyle) {
    var textReplay = replayGroup.getReplay(
        style.getZIndex(), ol.render.ReplayType.TEXT);
    textReplay.setTextStyle(textStyle);
    var flatCoordinates = geometry.getFlatCoordinates();
    textReplay.drawText(flatCoordinates, 0, flatCoordinates.length,
        geometry.getStride(), geometry, feature);
  }
};


/**
 * @param {ol.render.ReplayGroup} replayGroup Replay group.
 * @param {ol.geom.Polygon|ol.render.Feature} geometry Geometry.
 * @param {ol.style.Style} style Style.
 * @param {ol.Feature|ol.render.Feature} feature Feature.
 * @private
 */
ol.renderer.vector.renderPolygonGeometry_ = function(replayGroup, geometry, style, feature) {
  var fillStyle = style.getFill();
  var strokeStyle = style.getStroke();
  if (fillStyle || strokeStyle) {
    var polygonReplay = replayGroup.getReplay(
        style.getZIndex(), ol.render.ReplayType.POLYGON);
    polygonReplay.setFillStrokeStyle(fillStyle, strokeStyle);
    polygonReplay.drawPolygon(geometry, feature);
  }
  var textStyle = style.getText();
  if (textStyle) {
    var textReplay = replayGroup.getReplay(
        style.getZIndex(), ol.render.ReplayType.TEXT);
    textReplay.setTextStyle(textStyle);
    textReplay.drawText(
        geometry.getFlatInteriorPoint(), 0, 2, 2, geometry, feature);
  }
};


/**
 * @const
 * @private
 * @type {Object.<ol.geom.GeometryType,
 *                function(ol.render.ReplayGroup, ol.geom.Geometry,
 *                         ol.style.Style, Object)>}
 */
ol.renderer.vector.GEOMETRY_RENDERERS_ = {
  'Point': ol.renderer.vector.renderPointGeometry_,
  'LineString': ol.renderer.vector.renderLineStringGeometry_,
  'Polygon': ol.renderer.vector.renderPolygonGeometry_,
  'MultiPoint': ol.renderer.vector.renderMultiPointGeometry_,
  'MultiLineString': ol.renderer.vector.renderMultiLineStringGeometry_,
  'MultiPolygon': ol.renderer.vector.renderMultiPolygonGeometry_,
  'GeometryCollection': ol.renderer.vector.renderGeometryCollectionGeometry_,
  'Circle': ol.renderer.vector.renderCircleGeometry_
};

goog.provide('ol.ImageCanvas');

goog.require('ol');
goog.require('ol.ImageBase');
goog.require('ol.ImageState');


/**
 * @constructor
 * @extends {ol.ImageBase}
 * @param {ol.Extent} extent Extent.
 * @param {number} resolution Resolution.
 * @param {number} pixelRatio Pixel ratio.
 * @param {Array.<ol.Attribution>} attributions Attributions.
 * @param {HTMLCanvasElement} canvas Canvas.
 * @param {ol.ImageCanvasLoader=} opt_loader Optional loader function to
 *     support asynchronous canvas drawing.
 */
ol.ImageCanvas = function(extent, resolution, pixelRatio, attributions,
    canvas, opt_loader) {

  /**
   * Optional canvas loader function.
   * @type {?ol.ImageCanvasLoader}
   * @private
   */
  this.loader_ = opt_loader !== undefined ? opt_loader : null;

  var state = opt_loader !== undefined ?
      ol.ImageState.IDLE : ol.ImageState.LOADED;

  ol.ImageBase.call(this, extent, resolution, pixelRatio, state, attributions);

  /**
   * @private
   * @type {HTMLCanvasElement}
   */
  this.canvas_ = canvas;

  /**
   * @private
   * @type {Error}
   */
  this.error_ = null;

};
ol.inherits(ol.ImageCanvas, ol.ImageBase);


/**
 * Get any error associated with asynchronous rendering.
 * @return {Error} Any error that occurred during rendering.
 */
ol.ImageCanvas.prototype.getError = function() {
  return this.error_;
};


/**
 * Handle async drawing complete.
 * @param {Error} err Any error during drawing.
 * @private
 */
ol.ImageCanvas.prototype.handleLoad_ = function(err) {
  if (err) {
    this.error_ = err;
    this.state = ol.ImageState.ERROR;
  } else {
    this.state = ol.ImageState.LOADED;
  }
  this.changed();
};


/**
 * Trigger drawing on canvas.
 */
ol.ImageCanvas.prototype.load = function() {
  if (this.state == ol.ImageState.IDLE) {
    goog.DEBUG && console.assert(this.loader_, 'this.loader_ must be set');
    this.state = ol.ImageState.LOADING;
    this.changed();
    this.loader_(this.handleLoad_.bind(this));
  }
};


/**
 * @inheritDoc
 */
ol.ImageCanvas.prototype.getImage = function(opt_context) {
  return this.canvas_;
};

goog.provide('ol.reproj');

goog.require('ol');
goog.require('ol.dom');
goog.require('ol.extent');
goog.require('ol.math');
goog.require('ol.proj');


/**
 * We need to employ more sophisticated solution
 * if the web browser antialiases clipping edges on canvas.
 *
 * Currently only Chrome does not antialias the edges, but this is probably
 * going to be "fixed" in the future: http://crbug.com/424291
 *
 * @type {boolean}
 * @private
 */
ol.reproj.browserAntialiasesClip_ = (function(global) {
  // Adapted from http://stackoverflow.com/questions/4565112/javascript-how-to-find-out-if-the-user-browser-is-chrome
  var isOpera = global.navigator.userAgent.indexOf('OPR') > -1;
  var isIEedge = global.navigator.userAgent.indexOf('Edge') > -1;
  return !(
    !global.navigator.userAgent.match('CriOS') &&  // Not Chrome on iOS
    global.chrome !== null && global.chrome !== undefined && // Has chrome in window
    global.navigator.vendor === 'Google Inc.' && // Vendor is Google.
    isOpera == false && // Not Opera
    isIEedge == false // Not Edge
  );
})(ol.global);


/**
 * Calculates ideal resolution to use from the source in order to achieve
 * pixel mapping as close as possible to 1:1 during reprojection.
 * The resolution is calculated regardless of what resolutions
 * are actually available in the dataset (TileGrid, Image, ...).
 *
 * @param {ol.proj.Projection} sourceProj Source projection.
 * @param {ol.proj.Projection} targetProj Target projection.
 * @param {ol.Coordinate} targetCenter Target center.
 * @param {number} targetResolution Target resolution.
 * @return {number} The best resolution to use. Can be +-Infinity, NaN or 0.
 */
ol.reproj.calculateSourceResolution = function(sourceProj, targetProj,
    targetCenter, targetResolution) {

  var sourceCenter = ol.proj.transform(targetCenter, targetProj, sourceProj);

  // calculate the ideal resolution of the source data
  var sourceResolution =
      targetProj.getPointResolution(targetResolution, targetCenter);

  var targetMetersPerUnit = targetProj.getMetersPerUnit();
  if (targetMetersPerUnit !== undefined) {
    sourceResolution *= targetMetersPerUnit;
  }
  var sourceMetersPerUnit = sourceProj.getMetersPerUnit();
  if (sourceMetersPerUnit !== undefined) {
    sourceResolution /= sourceMetersPerUnit;
  }

  // Based on the projection properties, the point resolution at the specified
  // coordinates may be slightly different. We need to reverse-compensate this
  // in order to achieve optimal results.

  var compensationFactor =
      sourceProj.getPointResolution(sourceResolution, sourceCenter) /
      sourceResolution;

  if (isFinite(compensationFactor) && compensationFactor > 0) {
    sourceResolution /= compensationFactor;
  }

  return sourceResolution;
};


/**
 * Enlarge the clipping triangle point by 1 pixel to ensure the edges overlap
 * in order to mask gaps caused by antialiasing.
 *
 * @param {number} centroidX Centroid of the triangle (x coordinate in pixels).
 * @param {number} centroidY Centroid of the triangle (y coordinate in pixels).
 * @param {number} x X coordinate of the point (in pixels).
 * @param {number} y Y coordinate of the point (in pixels).
 * @return {ol.Coordinate} New point 1 px farther from the centroid.
 * @private
 */
ol.reproj.enlargeClipPoint_ = function(centroidX, centroidY, x, y) {
  var dX = x - centroidX, dY = y - centroidY;
  var distance = Math.sqrt(dX * dX + dY * dY);
  return [Math.round(x + dX / distance), Math.round(y + dY / distance)];
};


/**
 * Renders the source data into new canvas based on the triangulation.
 *
 * @param {number} width Width of the canvas.
 * @param {number} height Height of the canvas.
 * @param {number} pixelRatio Pixel ratio.
 * @param {number} sourceResolution Source resolution.
 * @param {ol.Extent} sourceExtent Extent of the data source.
 * @param {number} targetResolution Target resolution.
 * @param {ol.Extent} targetExtent Target extent.
 * @param {ol.reproj.Triangulation} triangulation Calculated triangulation.
 * @param {Array.<{extent: ol.Extent,
 *                 image: (HTMLCanvasElement|Image|HTMLVideoElement)}>} sources
 *             Array of sources.
 * @param {number} gutter Gutter of the sources.
 * @param {boolean=} opt_renderEdges Render reprojection edges.
 * @return {HTMLCanvasElement} Canvas with reprojected data.
 */
ol.reproj.render = function(width, height, pixelRatio,
    sourceResolution, sourceExtent, targetResolution, targetExtent,
    triangulation, sources, gutter, opt_renderEdges) {

  var context = ol.dom.createCanvasContext2D(Math.round(pixelRatio * width),
                                             Math.round(pixelRatio * height));

  if (sources.length === 0) {
    return context.canvas;
  }

  context.scale(pixelRatio, pixelRatio);

  var sourceDataExtent = ol.extent.createEmpty();
  sources.forEach(function(src, i, arr) {
    ol.extent.extend(sourceDataExtent, src.extent);
  });

  var canvasWidthInUnits = ol.extent.getWidth(sourceDataExtent);
  var canvasHeightInUnits = ol.extent.getHeight(sourceDataExtent);
  var stitchContext = ol.dom.createCanvasContext2D(
      Math.round(pixelRatio * canvasWidthInUnits / sourceResolution),
      Math.round(pixelRatio * canvasHeightInUnits / sourceResolution));

  var stitchScale = pixelRatio / sourceResolution;

  sources.forEach(function(src, i, arr) {
    var xPos = src.extent[0] - sourceDataExtent[0];
    var yPos = -(src.extent[3] - sourceDataExtent[3]);
    var srcWidth = ol.extent.getWidth(src.extent);
    var srcHeight = ol.extent.getHeight(src.extent);

    stitchContext.drawImage(
        src.image,
        gutter, gutter,
        src.image.width - 2 * gutter, src.image.height - 2 * gutter,
        xPos * stitchScale, yPos * stitchScale,
        srcWidth * stitchScale, srcHeight * stitchScale);
  });

  var targetTopLeft = ol.extent.getTopLeft(targetExtent);

  triangulation.getTriangles().forEach(function(triangle, i, arr) {
    /* Calculate affine transform (src -> dst)
     * Resulting matrix can be used to transform coordinate
     * from `sourceProjection` to destination pixels.
     *
     * To optimize number of context calls and increase numerical stability,
     * we also do the following operations:
     * trans(-topLeftExtentCorner), scale(1 / targetResolution), scale(1, -1)
     * here before solving the linear system so [ui, vi] are pixel coordinates.
     *
     * Src points: xi, yi
     * Dst points: ui, vi
     * Affine coefficients: aij
     *
     * | x0 y0 1  0  0 0 |   |a00|   |u0|
     * | x1 y1 1  0  0 0 |   |a01|   |u1|
     * | x2 y2 1  0  0 0 | x |a02| = |u2|
     * |  0  0 0 x0 y0 1 |   |a10|   |v0|
     * |  0  0 0 x1 y1 1 |   |a11|   |v1|
     * |  0  0 0 x2 y2 1 |   |a12|   |v2|
     */
    var source = triangle.source, target = triangle.target;
    var x0 = source[0][0], y0 = source[0][1],
        x1 = source[1][0], y1 = source[1][1],
        x2 = source[2][0], y2 = source[2][1];
    var u0 = (target[0][0] - targetTopLeft[0]) / targetResolution,
        v0 = -(target[0][1] - targetTopLeft[1]) / targetResolution;
    var u1 = (target[1][0] - targetTopLeft[0]) / targetResolution,
        v1 = -(target[1][1] - targetTopLeft[1]) / targetResolution;
    var u2 = (target[2][0] - targetTopLeft[0]) / targetResolution,
        v2 = -(target[2][1] - targetTopLeft[1]) / targetResolution;

    // Shift all the source points to improve numerical stability
    // of all the subsequent calculations. The [x0, y0] is used here.
    // This is also used to simplify the linear system.
    var sourceNumericalShiftX = x0, sourceNumericalShiftY = y0;
    x0 = 0;
    y0 = 0;
    x1 -= sourceNumericalShiftX;
    y1 -= sourceNumericalShiftY;
    x2 -= sourceNumericalShiftX;
    y2 -= sourceNumericalShiftY;

    var augmentedMatrix = [
      [x1, y1, 0, 0, u1 - u0],
      [x2, y2, 0, 0, u2 - u0],
      [0, 0, x1, y1, v1 - v0],
      [0, 0, x2, y2, v2 - v0]
    ];
    var affineCoefs = ol.math.solveLinearSystem(augmentedMatrix);
    if (!affineCoefs) {
      return;
    }

    context.save();
    context.beginPath();
    if (ol.reproj.browserAntialiasesClip_) {
      var centroidX = (u0 + u1 + u2) / 3, centroidY = (v0 + v1 + v2) / 3;
      var p0 = ol.reproj.enlargeClipPoint_(centroidX, centroidY, u0, v0);
      var p1 = ol.reproj.enlargeClipPoint_(centroidX, centroidY, u1, v1);
      var p2 = ol.reproj.enlargeClipPoint_(centroidX, centroidY, u2, v2);

      context.moveTo(p1[0], p1[1]);
      context.lineTo(p0[0], p0[1]);
      context.lineTo(p2[0], p2[1]);
    } else {
      context.moveTo(u1, v1);
      context.lineTo(u0, v0);
      context.lineTo(u2, v2);
    }
    context.clip();

    context.transform(
        affineCoefs[0], affineCoefs[2], affineCoefs[1], affineCoefs[3], u0, v0);

    context.translate(sourceDataExtent[0] - sourceNumericalShiftX,
                      sourceDataExtent[3] - sourceNumericalShiftY);

    context.scale(sourceResolution / pixelRatio,
                  -sourceResolution / pixelRatio);

    context.drawImage(stitchContext.canvas, 0, 0);
    context.restore();
  });

  if (opt_renderEdges) {
    context.save();

    context.strokeStyle = 'black';
    context.lineWidth = 1;

    triangulation.getTriangles().forEach(function(triangle, i, arr) {
      var target = triangle.target;
      var u0 = (target[0][0] - targetTopLeft[0]) / targetResolution,
          v0 = -(target[0][1] - targetTopLeft[1]) / targetResolution;
      var u1 = (target[1][0] - targetTopLeft[0]) / targetResolution,
          v1 = -(target[1][1] - targetTopLeft[1]) / targetResolution;
      var u2 = (target[2][0] - targetTopLeft[0]) / targetResolution,
          v2 = -(target[2][1] - targetTopLeft[1]) / targetResolution;

      context.beginPath();
      context.moveTo(u1, v1);
      context.lineTo(u0, v0);
      context.lineTo(u2, v2);
      context.closePath();
      context.stroke();
    });

    context.restore();
  }
  return context.canvas;
};

goog.provide('ol.reproj.Triangulation');

goog.require('ol');
goog.require('ol.extent');
goog.require('ol.math');
goog.require('ol.proj');


/**
 * @classdesc
 * Class containing triangulation of the given target extent.
 * Used for determining source data and the reprojection itself.
 *
 * @param {ol.proj.Projection} sourceProj Source projection.
 * @param {ol.proj.Projection} targetProj Target projection.
 * @param {ol.Extent} targetExtent Target extent to triangulate.
 * @param {ol.Extent} maxSourceExtent Maximal source extent that can be used.
 * @param {number} errorThreshold Acceptable error (in source units).
 * @constructor
 */
ol.reproj.Triangulation = function(sourceProj, targetProj, targetExtent,
    maxSourceExtent, errorThreshold) {

  /**
   * @type {ol.proj.Projection}
   * @private
   */
  this.sourceProj_ = sourceProj;

  /**
   * @type {ol.proj.Projection}
   * @private
   */
  this.targetProj_ = targetProj;

  /** @type {!Object.<string, ol.Coordinate>} */
  var transformInvCache = {};
  var transformInv = ol.proj.getTransform(this.targetProj_, this.sourceProj_);

  /**
   * @param {ol.Coordinate} c A coordinate.
   * @return {ol.Coordinate} Transformed coordinate.
   * @private
   */
  this.transformInv_ = function(c) {
    var key = c[0] + '/' + c[1];
    if (!transformInvCache[key]) {
      transformInvCache[key] = transformInv(c);
    }
    return transformInvCache[key];
  };

  /**
   * @type {ol.Extent}
   * @private
   */
  this.maxSourceExtent_ = maxSourceExtent;

  /**
   * @type {number}
   * @private
   */
  this.errorThresholdSquared_ = errorThreshold * errorThreshold;

  /**
   * @type {Array.<ol.ReprojTriangle>}
   * @private
   */
  this.triangles_ = [];

  /**
   * Indicates that the triangulation crosses edge of the source projection.
   * @type {boolean}
   * @private
   */
  this.wrapsXInSource_ = false;

  /**
   * @type {boolean}
   * @private
   */
  this.canWrapXInSource_ = this.sourceProj_.canWrapX() &&
      !!maxSourceExtent &&
      !!this.sourceProj_.getExtent() &&
      (ol.extent.getWidth(maxSourceExtent) ==
       ol.extent.getWidth(this.sourceProj_.getExtent()));

  /**
   * @type {?number}
   * @private
   */
  this.sourceWorldWidth_ = this.sourceProj_.getExtent() ?
      ol.extent.getWidth(this.sourceProj_.getExtent()) : null;

  /**
   * @type {?number}
   * @private
   */
  this.targetWorldWidth_ = this.targetProj_.getExtent() ?
      ol.extent.getWidth(this.targetProj_.getExtent()) : null;

  var destinationTopLeft = ol.extent.getTopLeft(targetExtent);
  var destinationTopRight = ol.extent.getTopRight(targetExtent);
  var destinationBottomRight = ol.extent.getBottomRight(targetExtent);
  var destinationBottomLeft = ol.extent.getBottomLeft(targetExtent);
  var sourceTopLeft = this.transformInv_(destinationTopLeft);
  var sourceTopRight = this.transformInv_(destinationTopRight);
  var sourceBottomRight = this.transformInv_(destinationBottomRight);
  var sourceBottomLeft = this.transformInv_(destinationBottomLeft);

  this.addQuad_(
      destinationTopLeft, destinationTopRight,
      destinationBottomRight, destinationBottomLeft,
      sourceTopLeft, sourceTopRight, sourceBottomRight, sourceBottomLeft,
      ol.RASTER_REPROJECTION_MAX_SUBDIVISION);

  if (this.wrapsXInSource_) {
    // Fix coordinates (ol.proj returns wrapped coordinates, "unwrap" here).
    // This significantly simplifies the rest of the reprojection process.

    goog.DEBUG && console.assert(this.sourceWorldWidth_ !== null);
    var leftBound = Infinity;
    this.triangles_.forEach(function(triangle, i, arr) {
      leftBound = Math.min(leftBound,
          triangle.source[0][0], triangle.source[1][0], triangle.source[2][0]);
    });

    // Shift triangles to be as close to `leftBound` as possible
    // (if the distance is more than `worldWidth / 2` it can be closer.
    this.triangles_.forEach(function(triangle) {
      if (Math.max(triangle.source[0][0], triangle.source[1][0],
          triangle.source[2][0]) - leftBound > this.sourceWorldWidth_ / 2) {
        var newTriangle = [[triangle.source[0][0], triangle.source[0][1]],
                           [triangle.source[1][0], triangle.source[1][1]],
                           [triangle.source[2][0], triangle.source[2][1]]];
        if ((newTriangle[0][0] - leftBound) > this.sourceWorldWidth_ / 2) {
          newTriangle[0][0] -= this.sourceWorldWidth_;
        }
        if ((newTriangle[1][0] - leftBound) > this.sourceWorldWidth_ / 2) {
          newTriangle[1][0] -= this.sourceWorldWidth_;
        }
        if ((newTriangle[2][0] - leftBound) > this.sourceWorldWidth_ / 2) {
          newTriangle[2][0] -= this.sourceWorldWidth_;
        }

        // Rarely (if the extent contains both the dateline and prime meridian)
        // the shift can in turn break some triangles.
        // Detect this here and don't shift in such cases.
        var minX = Math.min(
            newTriangle[0][0], newTriangle[1][0], newTriangle[2][0]);
        var maxX = Math.max(
            newTriangle[0][0], newTriangle[1][0], newTriangle[2][0]);
        if ((maxX - minX) < this.sourceWorldWidth_ / 2) {
          triangle.source = newTriangle;
        }
      }
    }, this);
  }

  transformInvCache = {};
};


/**
 * Adds triangle to the triangulation.
 * @param {ol.Coordinate} a The target a coordinate.
 * @param {ol.Coordinate} b The target b coordinate.
 * @param {ol.Coordinate} c The target c coordinate.
 * @param {ol.Coordinate} aSrc The source a coordinate.
 * @param {ol.Coordinate} bSrc The source b coordinate.
 * @param {ol.Coordinate} cSrc The source c coordinate.
 * @private
 */
ol.reproj.Triangulation.prototype.addTriangle_ = function(a, b, c,
    aSrc, bSrc, cSrc) {
  this.triangles_.push({
    source: [aSrc, bSrc, cSrc],
    target: [a, b, c]
  });
};


/**
 * Adds quad (points in clock-wise order) to the triangulation
 * (and reprojects the vertices) if valid.
 * Performs quad subdivision if needed to increase precision.
 *
 * @param {ol.Coordinate} a The target a coordinate.
 * @param {ol.Coordinate} b The target b coordinate.
 * @param {ol.Coordinate} c The target c coordinate.
 * @param {ol.Coordinate} d The target d coordinate.
 * @param {ol.Coordinate} aSrc The source a coordinate.
 * @param {ol.Coordinate} bSrc The source b coordinate.
 * @param {ol.Coordinate} cSrc The source c coordinate.
 * @param {ol.Coordinate} dSrc The source d coordinate.
 * @param {number} maxSubdivision Maximal allowed subdivision of the quad.
 * @private
 */
ol.reproj.Triangulation.prototype.addQuad_ = function(a, b, c, d,
    aSrc, bSrc, cSrc, dSrc, maxSubdivision) {

  var sourceQuadExtent = ol.extent.boundingExtent([aSrc, bSrc, cSrc, dSrc]);
  var sourceCoverageX = this.sourceWorldWidth_ ?
      ol.extent.getWidth(sourceQuadExtent) / this.sourceWorldWidth_ : null;
  var sourceWorldWidth = /** @type {number} */ (this.sourceWorldWidth_);

  // when the quad is wrapped in the source projection
  // it covers most of the projection extent, but not fully
  var wrapsX = this.sourceProj_.canWrapX() &&
               sourceCoverageX > 0.5 && sourceCoverageX < 1;

  var needsSubdivision = false;

  if (maxSubdivision > 0) {
    if (this.targetProj_.isGlobal() && this.targetWorldWidth_) {
      var targetQuadExtent = ol.extent.boundingExtent([a, b, c, d]);
      var targetCoverageX =
          ol.extent.getWidth(targetQuadExtent) / this.targetWorldWidth_;
      needsSubdivision |=
          targetCoverageX > ol.RASTER_REPROJECTION_MAX_TRIANGLE_WIDTH;
    }
    if (!wrapsX && this.sourceProj_.isGlobal() && sourceCoverageX) {
      needsSubdivision |=
          sourceCoverageX > ol.RASTER_REPROJECTION_MAX_TRIANGLE_WIDTH;
    }
  }

  if (!needsSubdivision && this.maxSourceExtent_) {
    if (!ol.extent.intersects(sourceQuadExtent, this.maxSourceExtent_)) {
      // whole quad outside source projection extent -> ignore
      return;
    }
  }

  if (!needsSubdivision) {
    if (!isFinite(aSrc[0]) || !isFinite(aSrc[1]) ||
        !isFinite(bSrc[0]) || !isFinite(bSrc[1]) ||
        !isFinite(cSrc[0]) || !isFinite(cSrc[1]) ||
        !isFinite(dSrc[0]) || !isFinite(dSrc[1])) {
      if (maxSubdivision > 0) {
        needsSubdivision = true;
      } else {
        return;
      }
    }
  }

  if (maxSubdivision > 0) {
    if (!needsSubdivision) {
      var center = [(a[0] + c[0]) / 2, (a[1] + c[1]) / 2];
      var centerSrc = this.transformInv_(center);

      var dx;
      if (wrapsX) {
        var centerSrcEstimX =
            (ol.math.modulo(aSrc[0], sourceWorldWidth) +
             ol.math.modulo(cSrc[0], sourceWorldWidth)) / 2;
        dx = centerSrcEstimX -
            ol.math.modulo(centerSrc[0], sourceWorldWidth);
      } else {
        dx = (aSrc[0] + cSrc[0]) / 2 - centerSrc[0];
      }
      var dy = (aSrc[1] + cSrc[1]) / 2 - centerSrc[1];
      var centerSrcErrorSquared = dx * dx + dy * dy;
      needsSubdivision = centerSrcErrorSquared > this.errorThresholdSquared_;
    }
    if (needsSubdivision) {
      if (Math.abs(a[0] - c[0]) <= Math.abs(a[1] - c[1])) {
        // split horizontally (top & bottom)
        var bc = [(b[0] + c[0]) / 2, (b[1] + c[1]) / 2];
        var bcSrc = this.transformInv_(bc);
        var da = [(d[0] + a[0]) / 2, (d[1] + a[1]) / 2];
        var daSrc = this.transformInv_(da);

        this.addQuad_(
            a, b, bc, da, aSrc, bSrc, bcSrc, daSrc, maxSubdivision - 1);
        this.addQuad_(
            da, bc, c, d, daSrc, bcSrc, cSrc, dSrc, maxSubdivision - 1);
      } else {
        // split vertically (left & right)
        var ab = [(a[0] + b[0]) / 2, (a[1] + b[1]) / 2];
        var abSrc = this.transformInv_(ab);
        var cd = [(c[0] + d[0]) / 2, (c[1] + d[1]) / 2];
        var cdSrc = this.transformInv_(cd);

        this.addQuad_(
            a, ab, cd, d, aSrc, abSrc, cdSrc, dSrc, maxSubdivision - 1);
        this.addQuad_(
            ab, b, c, cd, abSrc, bSrc, cSrc, cdSrc, maxSubdivision - 1);
      }
      return;
    }
  }

  if (wrapsX) {
    if (!this.canWrapXInSource_) {
      return;
    }
    this.wrapsXInSource_ = true;
  }

  this.addTriangle_(a, c, d, aSrc, cSrc, dSrc);
  this.addTriangle_(a, b, c, aSrc, bSrc, cSrc);
};


/**
 * Calculates extent of the 'source' coordinates from all the triangles.
 *
 * @return {ol.Extent} Calculated extent.
 */
ol.reproj.Triangulation.prototype.calculateSourceExtent = function() {
  var extent = ol.extent.createEmpty();

  this.triangles_.forEach(function(triangle, i, arr) {
    var src = triangle.source;
    ol.extent.extendCoordinate(extent, src[0]);
    ol.extent.extendCoordinate(extent, src[1]);
    ol.extent.extendCoordinate(extent, src[2]);
  });

  return extent;
};


/**
 * @return {Array.<ol.ReprojTriangle>} Array of the calculated triangles.
 */
ol.reproj.Triangulation.prototype.getTriangles = function() {
  return this.triangles_;
};

goog.provide('ol.reproj.Image');

goog.require('ol');
goog.require('ol.ImageBase');
goog.require('ol.ImageState');
goog.require('ol.events');
goog.require('ol.events.EventType');
goog.require('ol.extent');
goog.require('ol.reproj');
goog.require('ol.reproj.Triangulation');


/**
 * @classdesc
 * Class encapsulating single reprojected image.
 * See {@link ol.source.Image}.
 *
 * @constructor
 * @extends {ol.ImageBase}
 * @param {ol.proj.Projection} sourceProj Source projection (of the data).
 * @param {ol.proj.Projection} targetProj Target projection.
 * @param {ol.Extent} targetExtent Target extent.
 * @param {number} targetResolution Target resolution.
 * @param {number} pixelRatio Pixel ratio.
 * @param {ol.ReprojImageFunctionType} getImageFunction
 *     Function returning source images (extent, resolution, pixelRatio).
 */
ol.reproj.Image = function(sourceProj, targetProj,
    targetExtent, targetResolution, pixelRatio, getImageFunction) {

  /**
   * @private
   * @type {ol.proj.Projection}
   */
  this.targetProj_ = targetProj;

  /**
   * @private
   * @type {ol.Extent}
   */
  this.maxSourceExtent_ = sourceProj.getExtent();
  var maxTargetExtent = targetProj.getExtent();

  var limitedTargetExtent = maxTargetExtent ?
      ol.extent.getIntersection(targetExtent, maxTargetExtent) : targetExtent;

  var targetCenter = ol.extent.getCenter(limitedTargetExtent);
  var sourceResolution = ol.reproj.calculateSourceResolution(
      sourceProj, targetProj, targetCenter, targetResolution);

  var errorThresholdInPixels = ol.DEFAULT_RASTER_REPROJECTION_ERROR_THRESHOLD;

  /**
   * @private
   * @type {!ol.reproj.Triangulation}
   */
  this.triangulation_ = new ol.reproj.Triangulation(
      sourceProj, targetProj, limitedTargetExtent, this.maxSourceExtent_,
      sourceResolution * errorThresholdInPixels);

  /**
   * @private
   * @type {number}
   */
  this.targetResolution_ = targetResolution;

  /**
   * @private
   * @type {ol.Extent}
   */
  this.targetExtent_ = targetExtent;

  var sourceExtent = this.triangulation_.calculateSourceExtent();

  /**
   * @private
   * @type {ol.ImageBase}
   */
  this.sourceImage_ =
      getImageFunction(sourceExtent, sourceResolution, pixelRatio);

  /**
   * @private
   * @type {number}
   */
  this.sourcePixelRatio_ =
      this.sourceImage_ ? this.sourceImage_.getPixelRatio() : 1;

  /**
   * @private
   * @type {HTMLCanvasElement}
   */
  this.canvas_ = null;

  /**
   * @private
   * @type {?ol.EventsKey}
   */
  this.sourceListenerKey_ = null;


  var state = ol.ImageState.LOADED;
  var attributions = [];

  if (this.sourceImage_) {
    state = ol.ImageState.IDLE;
    attributions = this.sourceImage_.getAttributions();
  }

  ol.ImageBase.call(this, targetExtent, targetResolution, this.sourcePixelRatio_,
            state, attributions);
};
ol.inherits(ol.reproj.Image, ol.ImageBase);


/**
 * @inheritDoc
 */
ol.reproj.Image.prototype.disposeInternal = function() {
  if (this.state == ol.ImageState.LOADING) {
    this.unlistenSource_();
  }
  ol.ImageBase.prototype.disposeInternal.call(this);
};


/**
 * @inheritDoc
 */
ol.reproj.Image.prototype.getImage = function(opt_context) {
  return this.canvas_;
};


/**
 * @return {ol.proj.Projection} Projection.
 */
ol.reproj.Image.prototype.getProjection = function() {
  return this.targetProj_;
};


/**
 * @private
 */
ol.reproj.Image.prototype.reproject_ = function() {
  var sourceState = this.sourceImage_.getState();
  if (sourceState == ol.ImageState.LOADED) {
    var width = ol.extent.getWidth(this.targetExtent_) / this.targetResolution_;
    var height =
        ol.extent.getHeight(this.targetExtent_) / this.targetResolution_;

    this.canvas_ = ol.reproj.render(width, height, this.sourcePixelRatio_,
        this.sourceImage_.getResolution(), this.maxSourceExtent_,
        this.targetResolution_, this.targetExtent_, this.triangulation_, [{
          extent: this.sourceImage_.getExtent(),
          image: this.sourceImage_.getImage()
        }], 0);
  }
  this.state = sourceState;
  this.changed();
};


/**
 * @inheritDoc
 */
ol.reproj.Image.prototype.load = function() {
  if (this.state == ol.ImageState.IDLE) {
    this.state = ol.ImageState.LOADING;
    this.changed();

    var sourceState = this.sourceImage_.getState();
    if (sourceState == ol.ImageState.LOADED ||
        sourceState == ol.ImageState.ERROR) {
      this.reproject_();
    } else {
      this.sourceListenerKey_ = ol.events.listen(this.sourceImage_,
          ol.events.EventType.CHANGE, function(e) {
            var sourceState = this.sourceImage_.getState();
            if (sourceState == ol.ImageState.LOADED ||
                sourceState == ol.ImageState.ERROR) {
              this.unlistenSource_();
              this.reproject_();
            }
          }, this);
      this.sourceImage_.load();
    }
  }
};


/**
 * @private
 */
ol.reproj.Image.prototype.unlistenSource_ = function() {
  goog.DEBUG && console.assert(this.sourceListenerKey_,
      'this.sourceListenerKey_ should not be null');
  ol.events.unlistenByKey(/** @type {!ol.EventsKey} */ (this.sourceListenerKey_));
  this.sourceListenerKey_ = null;
};

goog.provide('ol.source.Image');
goog.provide('ol.source.ImageEvent');

goog.require('ol');
goog.require('ol.ImageState');
goog.require('ol.array');
goog.require('ol.events.Event');
goog.require('ol.extent');
goog.require('ol.proj');
goog.require('ol.reproj.Image');
goog.require('ol.source.Source');


/**
 * @classdesc
 * Abstract base class; normally only used for creating subclasses and not
 * instantiated in apps.
 * Base class for sources providing a single image.
 *
 * @constructor
 * @extends {ol.source.Source}
 * @param {ol.SourceImageOptions} options Single image source options.
 * @api
 */
ol.source.Image = function(options) {

  ol.source.Source.call(this, {
    attributions: options.attributions,
    extent: options.extent,
    logo: options.logo,
    projection: options.projection,
    state: options.state
  });

  /**
   * @private
   * @type {Array.<number>}
   */
  this.resolutions_ = options.resolutions !== undefined ?
      options.resolutions : null;
  goog.DEBUG && console.assert(!this.resolutions_ ||
      ol.array.isSorted(this.resolutions_,
          function(a, b) {
            return b - a;
          }, true), 'resolutions must be null or sorted in descending order');


  /**
   * @private
   * @type {ol.reproj.Image}
   */
  this.reprojectedImage_ = null;


  /**
   * @private
   * @type {number}
   */
  this.reprojectedRevision_ = 0;

};
ol.inherits(ol.source.Image, ol.source.Source);


/**
 * @return {Array.<number>} Resolutions.
 */
ol.source.Image.prototype.getResolutions = function() {
  return this.resolutions_;
};


/**
 * @protected
 * @param {number} resolution Resolution.
 * @return {number} Resolution.
 */
ol.source.Image.prototype.findNearestResolution = function(resolution) {
  if (this.resolutions_) {
    var idx = ol.array.linearFindNearest(this.resolutions_, resolution, 0);
    resolution = this.resolutions_[idx];
  }
  return resolution;
};


/**
 * @param {ol.Extent} extent Extent.
 * @param {number} resolution Resolution.
 * @param {number} pixelRatio Pixel ratio.
 * @param {ol.proj.Projection} projection Projection.
 * @return {ol.ImageBase} Single image.
 */
ol.source.Image.prototype.getImage = function(extent, resolution, pixelRatio, projection) {
  var sourceProjection = this.getProjection();
  if (!ol.ENABLE_RASTER_REPROJECTION ||
      !sourceProjection ||
      !projection ||
      ol.proj.equivalent(sourceProjection, projection)) {
    if (sourceProjection) {
      projection = sourceProjection;
    }
    return this.getImageInternal(extent, resolution, pixelRatio, projection);
  } else {
    if (this.reprojectedImage_) {
      if (this.reprojectedRevision_ == this.getRevision() &&
          ol.proj.equivalent(
              this.reprojectedImage_.getProjection(), projection) &&
          this.reprojectedImage_.getResolution() == resolution &&
          this.reprojectedImage_.getPixelRatio() == pixelRatio &&
          ol.extent.equals(this.reprojectedImage_.getExtent(), extent)) {
        return this.reprojectedImage_;
      }
      this.reprojectedImage_.dispose();
      this.reprojectedImage_ = null;
    }

    this.reprojectedImage_ = new ol.reproj.Image(
        sourceProjection, projection, extent, resolution, pixelRatio,
        function(extent, resolution, pixelRatio) {
          return this.getImageInternal(extent, resolution,
              pixelRatio, sourceProjection);
        }.bind(this));
    this.reprojectedRevision_ = this.getRevision();

    return this.reprojectedImage_;
  }
};


/**
 * @abstract
 * @param {ol.Extent} extent Extent.
 * @param {number} resolution Resolution.
 * @param {number} pixelRatio Pixel ratio.
 * @param {ol.proj.Projection} projection Projection.
 * @return {ol.ImageBase} Single image.
 * @protected
 */
ol.source.Image.prototype.getImageInternal = function(extent, resolution, pixelRatio, projection) {};


/**
 * Handle image change events.
 * @param {ol.events.Event} event Event.
 * @protected
 */
ol.source.Image.prototype.handleImageChange = function(event) {
  var image = /** @type {ol.Image} */ (event.target);
  switch (image.getState()) {
    case ol.ImageState.LOADING:
      this.dispatchEvent(
          new ol.source.ImageEvent(ol.source.ImageEventType.IMAGELOADSTART,
              image));
      break;
    case ol.ImageState.LOADED:
      this.dispatchEvent(
          new ol.source.ImageEvent(ol.source.ImageEventType.IMAGELOADEND,
              image));
      break;
    case ol.ImageState.ERROR:
      this.dispatchEvent(
          new ol.source.ImageEvent(ol.source.ImageEventType.IMAGELOADERROR,
              image));
      break;
    default:
      // pass
  }
};


/**
 * Default image load function for image sources that use ol.Image image
 * instances.
 * @param {ol.Image} image Image.
 * @param {string} src Source.
 */
ol.source.Image.defaultImageLoadFunction = function(image, src) {
  image.getImage().src = src;
};


/**
 * @classdesc
 * Events emitted by {@link ol.source.Image} instances are instances of this
 * type.
 *
 * @constructor
 * @extends {ol.events.Event}
 * @implements {oli.source.ImageEvent}
 * @param {string} type Type.
 * @param {ol.Image} image The image.
 */
ol.source.ImageEvent = function(type, image) {

  ol.events.Event.call(this, type);

  /**
   * The image related to the event.
   * @type {ol.Image}
   * @api
   */
  this.image = image;

};
ol.inherits(ol.source.ImageEvent, ol.events.Event);


/**
 * @enum {string}
 */
ol.source.ImageEventType = {

  /**
   * Triggered when an image starts loading.
   * @event ol.source.ImageEvent#imageloadstart
   * @api
   */
  IMAGELOADSTART: 'imageloadstart',

  /**
   * Triggered when an image finishes loading.
   * @event ol.source.ImageEvent#imageloadend
   * @api
   */
  IMAGELOADEND: 'imageloadend',

  /**
   * Triggered if image loading results in an error.
   * @event ol.source.ImageEvent#imageloaderror
   * @api
   */
  IMAGELOADERROR: 'imageloaderror'

};

goog.provide('ol.source.ImageCanvas');

goog.require('ol');
goog.require('ol.ImageCanvas');
goog.require('ol.extent');
goog.require('ol.source.Image');


/**
 * @classdesc
 * Base class for image sources where a canvas element is the image.
 *
 * @constructor
 * @extends {ol.source.Image}
 * @param {olx.source.ImageCanvasOptions} options Constructor options.
 * @api
 */
ol.source.ImageCanvas = function(options) {

  ol.source.Image.call(this, {
    attributions: options.attributions,
    logo: options.logo,
    projection: options.projection,
    resolutions: options.resolutions,
    state: options.state
  });

  /**
   * @private
   * @type {ol.CanvasFunctionType}
   */
  this.canvasFunction_ = options.canvasFunction;

  /**
   * @private
   * @type {ol.ImageCanvas}
   */
  this.canvas_ = null;

  /**
   * @private
   * @type {number}
   */
  this.renderedRevision_ = 0;

  /**
   * @private
   * @type {number}
   */
  this.ratio_ = options.ratio !== undefined ?
      options.ratio : 1.5;

};
ol.inherits(ol.source.ImageCanvas, ol.source.Image);


/**
 * @inheritDoc
 */
ol.source.ImageCanvas.prototype.getImageInternal = function(extent, resolution, pixelRatio, projection) {
  resolution = this.findNearestResolution(resolution);

  var canvas = this.canvas_;
  if (canvas &&
      this.renderedRevision_ == this.getRevision() &&
      canvas.getResolution() == resolution &&
      canvas.getPixelRatio() == pixelRatio &&
      ol.extent.containsExtent(canvas.getExtent(), extent)) {
    return canvas;
  }

  extent = extent.slice();
  ol.extent.scaleFromCenter(extent, this.ratio_);
  var width = ol.extent.getWidth(extent) / resolution;
  var height = ol.extent.getHeight(extent) / resolution;
  var size = [width * pixelRatio, height * pixelRatio];

  var canvasElement = this.canvasFunction_(
      extent, resolution, pixelRatio, size, projection);
  if (canvasElement) {
    canvas = new ol.ImageCanvas(extent, resolution, pixelRatio,
        this.getAttributions(), canvasElement);
  }
  this.canvas_ = canvas;
  this.renderedRevision_ = this.getRevision();

  return canvas;
};

goog.provide('ol.source.ImageVector');

goog.require('ol');
goog.require('ol.dom');
goog.require('ol.events');
goog.require('ol.events.EventType');
goog.require('ol.extent');
goog.require('ol.render.canvas.ReplayGroup');
goog.require('ol.renderer.vector');
goog.require('ol.source.ImageCanvas');
goog.require('ol.style.Style');
goog.require('ol.transform');


/**
 * @classdesc
 * An image source whose images are canvas elements into which vector features
 * read from a vector source (`ol.source.Vector`) are drawn. An
 * `ol.source.ImageVector` object is to be used as the `source` of an image
 * layer (`ol.layer.Image`). Image layers are rotated, scaled, and translated,
 * as opposed to being re-rendered, during animations and interactions. So, like
 * any other image layer, an image layer configured with an
 * `ol.source.ImageVector` will exhibit this behaviour. This is in contrast to a
 * vector layer, where vector features are re-drawn during animations and
 * interactions.
 *
 * @constructor
 * @extends {ol.source.ImageCanvas}
 * @param {olx.source.ImageVectorOptions} options Options.
 * @api
 */
ol.source.ImageVector = function(options) {

  /**
   * @private
   * @type {ol.source.Vector}
   */
  this.source_ = options.source;

  /**
   * @private
   * @type {ol.Transform}
   */
  this.transform_ = ol.transform.create();

  /**
   * @private
   * @type {CanvasRenderingContext2D}
   */
  this.canvasContext_ = ol.dom.createCanvasContext2D();

  /**
   * @private
   * @type {ol.Size}
   */
  this.canvasSize_ = [0, 0];

  /**
   * @private
   * @type {number}
   */
  this.renderBuffer_ = options.renderBuffer == undefined ? 100 : options.renderBuffer;

  /**
   * @private
   * @type {ol.render.canvas.ReplayGroup}
   */
  this.replayGroup_ = null;

  ol.source.ImageCanvas.call(this, {
    attributions: options.attributions,
    canvasFunction: this.canvasFunctionInternal_.bind(this),
    logo: options.logo,
    projection: options.projection,
    ratio: options.ratio,
    resolutions: options.resolutions,
    state: this.source_.getState()
  });

  /**
   * User provided style.
   * @type {ol.style.Style|Array.<ol.style.Style>|ol.StyleFunction}
   * @private
   */
  this.style_ = null;

  /**
   * Style function for use within the library.
   * @type {ol.StyleFunction|undefined}
   * @private
   */
  this.styleFunction_ = undefined;

  this.setStyle(options.style);

  ol.events.listen(this.source_, ol.events.EventType.CHANGE,
      this.handleSourceChange_, this);

};
ol.inherits(ol.source.ImageVector, ol.source.ImageCanvas);


/**
 * @param {ol.Extent} extent Extent.
 * @param {number} resolution Resolution.
 * @param {number} pixelRatio Pixel ratio.
 * @param {ol.Size} size Size.
 * @param {ol.proj.Projection} projection Projection;
 * @return {HTMLCanvasElement} Canvas element.
 * @private
 */
ol.source.ImageVector.prototype.canvasFunctionInternal_ = function(extent, resolution, pixelRatio, size, projection) {

  var replayGroup = new ol.render.canvas.ReplayGroup(
      ol.renderer.vector.getTolerance(resolution, pixelRatio), extent,
      resolution, this.source_.getOverlaps(), this.renderBuffer_);

  this.source_.loadFeatures(extent, resolution, projection);

  var loading = false;
  this.source_.forEachFeatureInExtent(extent,
      /**
       * @param {ol.Feature} feature Feature.
       */
      function(feature) {
        loading = loading ||
            this.renderFeature_(feature, resolution, pixelRatio, replayGroup);
      }, this);
  replayGroup.finish();

  if (loading) {
    return null;
  }

  if (this.canvasSize_[0] != size[0] || this.canvasSize_[1] != size[1]) {
    this.canvasContext_.canvas.width = size[0];
    this.canvasContext_.canvas.height = size[1];
    this.canvasSize_[0] = size[0];
    this.canvasSize_[1] = size[1];
  } else {
    this.canvasContext_.clearRect(0, 0, size[0], size[1]);
  }

  var transform = this.getTransform_(ol.extent.getCenter(extent),
      resolution, pixelRatio, size);
  replayGroup.replay(this.canvasContext_, pixelRatio, transform, 0, {});

  this.replayGroup_ = replayGroup;

  return this.canvasContext_.canvas;
};


/**
 * @inheritDoc
 */
ol.source.ImageVector.prototype.forEachFeatureAtCoordinate = function(
    coordinate, resolution, rotation, skippedFeatureUids, callback) {
  if (!this.replayGroup_) {
    return undefined;
  } else {
    /** @type {Object.<string, boolean>} */
    var features = {};
    return this.replayGroup_.forEachFeatureAtCoordinate(
        coordinate, resolution, 0, skippedFeatureUids,
        /**
         * @param {ol.Feature|ol.render.Feature} feature Feature.
         * @return {?} Callback result.
         */
        function(feature) {
          var key = ol.getUid(feature).toString();
          if (!(key in features)) {
            features[key] = true;
            return callback(feature);
          }
        });
  }
};


/**
 * Get a reference to the wrapped source.
 * @return {ol.source.Vector} Source.
 * @api
 */
ol.source.ImageVector.prototype.getSource = function() {
  return this.source_;
};


/**
 * Get the style for features.  This returns whatever was passed to the `style`
 * option at construction or to the `setStyle` method.
 * @return {ol.style.Style|Array.<ol.style.Style>|ol.StyleFunction}
 *     Layer style.
 * @api stable
 */
ol.source.ImageVector.prototype.getStyle = function() {
  return this.style_;
};


/**
 * Get the style function.
 * @return {ol.StyleFunction|undefined} Layer style function.
 * @api stable
 */
ol.source.ImageVector.prototype.getStyleFunction = function() {
  return this.styleFunction_;
};


/**
 * @param {ol.Coordinate} center Center.
 * @param {number} resolution Resolution.
 * @param {number} pixelRatio Pixel ratio.
 * @param {ol.Size} size Size.
 * @return {!ol.Transform} Transform.
 * @private
 */
ol.source.ImageVector.prototype.getTransform_ = function(center, resolution, pixelRatio, size) {
  var dx1 = size[0] / 2;
  var dy1 = size[1] / 2;
  var sx = pixelRatio / resolution;
  var sy = -sx;
  var dx2 = -center[0];
  var dy2 = -center[1];

  return ol.transform.compose(this.transform_, dx1, dy1, sx, sy, 0, dx2, dy2);
};


/**
 * Handle changes in image style state.
 * @param {ol.events.Event} event Image style change event.
 * @private
 */
ol.source.ImageVector.prototype.handleImageChange_ = function(event) {
  this.changed();
};


/**
 * @private
 */
ol.source.ImageVector.prototype.handleSourceChange_ = function() {
  // setState will trigger a CHANGE event, so we always rely
  // change events by calling setState.
  this.setState(this.source_.getState());
};


/**
 * @param {ol.Feature} feature Feature.
 * @param {number} resolution Resolution.
 * @param {number} pixelRatio Pixel ratio.
 * @param {ol.render.canvas.ReplayGroup} replayGroup Replay group.
 * @return {boolean} `true` if an image is loading.
 * @private
 */
ol.source.ImageVector.prototype.renderFeature_ = function(feature, resolution, pixelRatio, replayGroup) {
  var styles;
  var styleFunction = feature.getStyleFunction();
  if (styleFunction) {
    styles = styleFunction.call(feature, resolution);
  } else if (this.styleFunction_) {
    styles = this.styleFunction_(feature, resolution);
  }
  if (!styles) {
    return false;
  }
  var i, ii, loading = false;
  if (!Array.isArray(styles)) {
    styles = [styles];
  }
  for (i = 0, ii = styles.length; i < ii; ++i) {
    loading = ol.renderer.vector.renderFeature(
        replayGroup, feature, styles[i],
        ol.renderer.vector.getSquaredTolerance(resolution, pixelRatio),
        this.handleImageChange_, this) || loading;
  }
  return loading;
};


/**
 * Set the style for features.  This can be a single style object, an array
 * of styles, or a function that takes a feature and resolution and returns
 * an array of styles. If it is `undefined` the default style is used. If
 * it is `null` the layer has no style (a `null` style), so only features
 * that have their own styles will be rendered in the layer. See
 * {@link ol.style} for information on the default style.
 * @param {ol.style.Style|Array.<ol.style.Style>|ol.StyleFunction|undefined}
 *     style Layer style.
 * @api stable
 */
ol.source.ImageVector.prototype.setStyle = function(style) {
  this.style_ = style !== undefined ? style : ol.style.Style.defaultFunction;
  this.styleFunction_ = !style ?
      undefined : ol.style.Style.createFunction(this.style_);
  this.changed();
};

goog.provide('ol.renderer.canvas.ImageLayer');

goog.require('ol');
goog.require('ol.View');
goog.require('ol.dom');
goog.require('ol.extent');
goog.require('ol.functions');
goog.require('ol.proj');
goog.require('ol.renderer.canvas.Layer');
goog.require('ol.source.ImageVector');
goog.require('ol.transform');


/**
 * @constructor
 * @extends {ol.renderer.canvas.Layer}
 * @param {ol.layer.Image} imageLayer Single image layer.
 */
ol.renderer.canvas.ImageLayer = function(imageLayer) {

  ol.renderer.canvas.Layer.call(this, imageLayer);

  /**
   * @private
   * @type {?ol.ImageBase}
   */
  this.image_ = null;

  /**
   * @private
   * @type {ol.Transform}
   */
  this.imageTransform_ = ol.transform.create();

  /**
   * @private
   * @type {?ol.Transform}
   */
  this.imageTransformInv_ = null;

  /**
   * @private
   * @type {CanvasRenderingContext2D}
   */
  this.hitCanvasContext_ = null;

};
ol.inherits(ol.renderer.canvas.ImageLayer, ol.renderer.canvas.Layer);


/**
 * @inheritDoc
 */
ol.renderer.canvas.ImageLayer.prototype.forEachFeatureAtCoordinate = function(coordinate, frameState, callback, thisArg) {
  var layer = this.getLayer();
  var source = layer.getSource();
  var resolution = frameState.viewState.resolution;
  var rotation = frameState.viewState.rotation;
  var skippedFeatureUids = frameState.skippedFeatureUids;
  return source.forEachFeatureAtCoordinate(
      coordinate, resolution, rotation, skippedFeatureUids,
      /**
       * @param {ol.Feature|ol.render.Feature} feature Feature.
       * @return {?} Callback result.
       */
      function(feature) {
        return callback.call(thisArg, feature, layer);
      });
};


/**
 * @param {ol.Pixel} pixel Pixel.
 * @param {olx.FrameState} frameState FrameState.
 * @param {function(this: S, ol.layer.Layer, ol.Color): T} callback Layer
 *     callback.
 * @param {S} thisArg Value to use as `this` when executing `callback`.
 * @return {T|undefined} Callback result.
 * @template S,T,U
 */
ol.renderer.canvas.ImageLayer.prototype.forEachLayerAtPixel = function(pixel, frameState, callback, thisArg) {
  if (!this.getImage()) {
    return undefined;
  }

  if (this.getLayer().getSource() instanceof ol.source.ImageVector) {
    // for ImageVector sources use the original hit-detection logic,
    // so that for example also transparent polygons are detected
    var coordinate = ol.transform.apply(
        frameState.pixelToCoordinateTransform, pixel.slice());
    var hasFeature = this.forEachFeatureAtCoordinate(
        coordinate, frameState, ol.functions.TRUE, this);

    if (hasFeature) {
      return callback.call(thisArg, this.getLayer(), null);
    } else {
      return undefined;
    }
  } else {
    // for all other image sources directly check the image
    if (!this.imageTransformInv_) {
      this.imageTransformInv_ = ol.transform.invert(this.imageTransform_.slice());
    }

    var pixelOnCanvas =
        this.getPixelOnCanvas(pixel, this.imageTransformInv_);

    if (!this.hitCanvasContext_) {
      this.hitCanvasContext_ = ol.dom.createCanvasContext2D(1, 1);
    }

    this.hitCanvasContext_.clearRect(0, 0, 1, 1);
    this.hitCanvasContext_.drawImage(
        this.getImage(), pixelOnCanvas[0], pixelOnCanvas[1], 1, 1, 0, 0, 1, 1);

    var imageData = this.hitCanvasContext_.getImageData(0, 0, 1, 1).data;
    if (imageData[3] > 0) {
      return callback.call(thisArg, this.getLayer(),  imageData);
    } else {
      return undefined;
    }
  }
};


/**
 * @inheritDoc
 */
ol.renderer.canvas.ImageLayer.prototype.getImage = function() {
  return !this.image_ ? null : this.image_.getImage();
};


/**
 * @inheritDoc
 */
ol.renderer.canvas.ImageLayer.prototype.getImageTransform = function() {
  return this.imageTransform_;
};


/**
 * @inheritDoc
 */
ol.renderer.canvas.ImageLayer.prototype.prepareFrame = function(frameState, layerState) {

  var pixelRatio = frameState.pixelRatio;
  var viewState = frameState.viewState;
  var viewCenter = viewState.center;
  var viewResolution = viewState.resolution;

  var image;
  var imageLayer = /** @type {ol.layer.Image} */ (this.getLayer());
  var imageSource = imageLayer.getSource();

  var hints = frameState.viewHints;

  var renderedExtent = frameState.extent;
  if (layerState.extent !== undefined) {
    renderedExtent = ol.extent.getIntersection(
        renderedExtent, layerState.extent);
  }

  if (!hints[ol.View.Hint.ANIMATING] && !hints[ol.View.Hint.INTERACTING] &&
      !ol.extent.isEmpty(renderedExtent)) {
    var projection = viewState.projection;
    if (!ol.ENABLE_RASTER_REPROJECTION) {
      var sourceProjection = imageSource.getProjection();
      if (sourceProjection) {
        goog.DEBUG && console.assert(ol.proj.equivalent(projection, sourceProjection),
            'projection and sourceProjection are equivalent');
        projection = sourceProjection;
      }
    }
    image = imageSource.getImage(
        renderedExtent, viewResolution, pixelRatio, projection);
    if (image) {
      var loaded = this.loadImage(image);
      if (loaded) {
        this.image_ = image;
      }
    }
  }

  if (this.image_) {
    image = this.image_;
    var imageExtent = image.getExtent();
    var imageResolution = image.getResolution();
    var imagePixelRatio = image.getPixelRatio();
    var scale = pixelRatio * imageResolution /
        (viewResolution * imagePixelRatio);
    var transform = ol.transform.reset(this.imageTransform_);
    ol.transform.translate(transform,
        pixelRatio * frameState.size[0] / 2,
        pixelRatio * frameState.size[1] / 2);
    ol.transform.scale(transform, scale, scale);
    ol.transform.translate(transform,
        imagePixelRatio * (imageExtent[0] - viewCenter[0]) / imageResolution,
        imagePixelRatio * (viewCenter[1] - imageExtent[3]) / imageResolution);
    this.imageTransformInv_ = null;
    this.updateAttributions(frameState.attributions, image.getAttributions());
    this.updateLogos(frameState, imageSource);
  }

  return !!this.image_;
};

// FIXME find correct globalCompositeOperation

goog.provide('ol.renderer.canvas.TileLayer');

goog.require('ol');
goog.require('ol.transform');
goog.require('ol.TileRange');
goog.require('ol.Tile');
goog.require('ol.array');
goog.require('ol.dom');
goog.require('ol.extent');
goog.require('ol.render.canvas');
goog.require('ol.render.EventType');
goog.require('ol.renderer.canvas.Layer');


/**
 * @constructor
 * @extends {ol.renderer.canvas.Layer}
 * @param {ol.layer.Tile|ol.layer.VectorTile} tileLayer Tile layer.
 */
ol.renderer.canvas.TileLayer = function(tileLayer) {

  ol.renderer.canvas.Layer.call(this, tileLayer);

  /**
   * @protected
   * @type {CanvasRenderingContext2D}
   */
  this.context = ol.dom.createCanvasContext2D();

  /**
   * @protected
   * @type {Array.<ol.Tile|undefined>}
   */
  this.renderedTiles = null;

  /**
   * @protected
   * @type {ol.Extent}
   */
  this.tmpExtent = ol.extent.createEmpty();

  /**
   * @private
   * @type {ol.TileCoord}
   */
  this.tmpTileCoord_ = [0, 0, 0];

  /**
   * @private
   * @type {ol.Transform}
   */
  this.imageTransform_ = ol.transform.create();

  /**
   * @protected
   * @type {number}
   */
  this.zDirection = 0;

};
ol.inherits(ol.renderer.canvas.TileLayer, ol.renderer.canvas.Layer);


/**
 * @inheritDoc
 */
ol.renderer.canvas.TileLayer.prototype.composeFrame = function(
    frameState, layerState, context) {
  var transform = this.getTransform(frameState, 0);
  this.dispatchPreComposeEvent(context, frameState, transform);
  this.renderTileImages(context, frameState, layerState);
  this.dispatchPostComposeEvent(context, frameState, transform);
};


/**
 * @inheritDoc
 */
ol.renderer.canvas.TileLayer.prototype.prepareFrame = function(
    frameState, layerState) {

  var pixelRatio = frameState.pixelRatio;
  var viewState = frameState.viewState;
  var projection = viewState.projection;

  var tileLayer = this.getLayer();
  var tileSource = /** @type {ol.source.Tile} */ (tileLayer.getSource());
  var tileGrid = tileSource.getTileGridForProjection(projection);
  var z = tileGrid.getZForResolution(viewState.resolution, this.zDirection);
  var tileResolution = tileGrid.getResolution(z);
  var center = viewState.center;
  var extent;
  if (tileResolution == viewState.resolution) {
    center = this.snapCenterToPixel(center, tileResolution, frameState.size);
    extent = ol.extent.getForViewAndSize(
        center, tileResolution, viewState.rotation, frameState.size);
  } else {
    extent = frameState.extent;
  }

  if (layerState.extent !== undefined) {
    extent = ol.extent.getIntersection(extent, layerState.extent);
  }
  if (ol.extent.isEmpty(extent)) {
    // Return false to prevent the rendering of the layer.
    return false;
  }

  var tileRange = tileGrid.getTileRangeForExtentAndResolution(
      extent, tileResolution);

  /**
   * @type {Object.<number, Object.<string, ol.Tile>>}
   */
  var tilesToDrawByZ = {};
  tilesToDrawByZ[z] = {};

  var findLoadedTiles = this.createLoadedTileFinder(
      tileSource, projection, tilesToDrawByZ);

  var useInterimTilesOnError = tileLayer.getUseInterimTilesOnError();

  var tmpExtent = ol.extent.createEmpty();
  var tmpTileRange = new ol.TileRange(0, 0, 0, 0);
  var childTileRange, fullyLoaded, tile, x, y;
  var drawableTile = (
      /**
       * @param {!ol.Tile} tile Tile.
       * @return {boolean} Tile is selected.
       */
      function(tile) {
        var tileState = tile.getState();
        return tileState == ol.Tile.State.LOADED ||
            tileState == ol.Tile.State.EMPTY ||
            tileState == ol.Tile.State.ERROR && !useInterimTilesOnError;
      });
  for (x = tileRange.minX; x <= tileRange.maxX; ++x) {
    for (y = tileRange.minY; y <= tileRange.maxY; ++y) {
      tile = tileSource.getTile(z, x, y, pixelRatio, projection);
      if (!drawableTile(tile) && tile.interimTile) {
        tile = tile.interimTile;
      }
      if (drawableTile(tile)) {
        tilesToDrawByZ[z][tile.tileCoord.toString()] = tile;
        continue;
      }
      fullyLoaded = tileGrid.forEachTileCoordParentTileRange(
          tile.tileCoord, findLoadedTiles, null, tmpTileRange, tmpExtent);
      if (!fullyLoaded) {
        childTileRange = tileGrid.getTileCoordChildTileRange(
            tile.tileCoord, tmpTileRange, tmpExtent);
        if (childTileRange) {
          findLoadedTiles(z + 1, childTileRange);
        }
      }

    }
  }

  /** @type {Array.<number>} */
  var zs = Object.keys(tilesToDrawByZ).map(Number);
  zs.sort(ol.array.numberSafeCompareFunction);
  var renderables = [];
  var i, ii, currentZ, tileCoordKey, tilesToDraw;
  for (i = 0, ii = zs.length; i < ii; ++i) {
    currentZ = zs[i];
    tilesToDraw = tilesToDrawByZ[currentZ];
    for (tileCoordKey in tilesToDraw) {
      tile = tilesToDraw[tileCoordKey];
      if (tile.getState() == ol.Tile.State.LOADED) {
        renderables.push(tile);
      }
    }
  }
  this.renderedTiles = renderables;

  this.updateUsedTiles(frameState.usedTiles, tileSource, z, tileRange);
  this.manageTilePyramid(frameState, tileSource, tileGrid, pixelRatio,
      projection, extent, z, tileLayer.getPreload());
  this.scheduleExpireCache(frameState, tileSource);
  this.updateLogos(frameState, tileSource);

  return true;
};


/**
 * @param {ol.Pixel} pixel Pixel.
 * @param {olx.FrameState} frameState FrameState.
 * @param {function(this: S, ol.layer.Layer, ol.Color): T} callback Layer
 *     callback.
 * @param {S} thisArg Value to use as `this` when executing `callback`.
 * @return {T|undefined} Callback result.
 * @template S,T,U
 */
ol.renderer.canvas.TileLayer.prototype.forEachLayerAtPixel = function(
    pixel, frameState, callback, thisArg) {
  var canvas = this.context.canvas;
  var size = frameState.size;
  var pixelRatio = frameState.pixelRatio;
  canvas.width = size[0] * pixelRatio;
  canvas.height = size[1] * pixelRatio;
  this.composeFrame(frameState, this.getLayer().getLayerState(), this.context);

  var imageData = this.context.getImageData(
      pixel[0], pixel[1], 1, 1).data;

  if (imageData[3] > 0) {
    return callback.call(thisArg, this.getLayer(),  imageData);
  } else {
    return undefined;
  }
};


/**
 * @param {CanvasRenderingContext2D} context Context.
 * @param {olx.FrameState} frameState Frame state.
 * @param {ol.LayerState} layerState Layer state.
 * @protected
 */
ol.renderer.canvas.TileLayer.prototype.renderTileImages = function(context, frameState, layerState) {
  var pixelRatio = frameState.pixelRatio;
  var viewState = frameState.viewState;
  var center = viewState.center;
  var projection = viewState.projection;
  var resolution = viewState.resolution;
  var rotation = viewState.rotation;
  var size = frameState.size;
  var offsetX = Math.round(pixelRatio * size[0] / 2);
  var offsetY = Math.round(pixelRatio * size[1] / 2);
  var pixelScale = pixelRatio / resolution;
  var layer = this.getLayer();
  var source = /** @type {ol.source.Tile} */ (layer.getSource());
  var tileGutter = pixelRatio * source.getGutter(projection);
  var tileGrid = source.getTileGridForProjection(projection);

  var hasRenderListeners = layer.hasListener(ol.render.EventType.RENDER);
  var renderContext = context;
  var drawScale = 1;
  var drawOffsetX, drawOffsetY, drawSize;
  if (rotation || hasRenderListeners) {
    renderContext = this.context;
    var renderCanvas = renderContext.canvas;
    drawScale = source.getTilePixelRatio(pixelRatio) / pixelRatio;
    var width = context.canvas.width * drawScale;
    var height = context.canvas.height * drawScale;
    // Make sure the canvas is big enough for all possible rotation angles
    drawSize = Math.round(Math.sqrt(width * width + height * height));
    if (renderCanvas.width != drawSize) {
      renderCanvas.width = renderCanvas.height = drawSize;
    } else {
      renderContext.clearRect(0, 0, drawSize, drawSize);
    }
    drawOffsetX = (drawSize - width) / 2 / drawScale;
    drawOffsetY = (drawSize - height) / 2 / drawScale;
    pixelScale *= drawScale;
    offsetX = Math.round(drawScale * (offsetX + drawOffsetX));
    offsetY = Math.round(drawScale * (offsetY + drawOffsetY));
  }
  // for performance reasons, context.save / context.restore is not used
  // to save and restore the transformation matrix and the opacity.
  // see http://jsperf.com/context-save-restore-versus-variable
  var alpha = renderContext.globalAlpha;
  renderContext.globalAlpha = layerState.opacity;

  var tilesToDraw = this.renderedTiles;

  var pixelExtents;
  var opaque = source.getOpaque(projection) && layerState.opacity == 1;
  if (!opaque) {
    tilesToDraw.reverse();
    pixelExtents = [];
  }

  var extent = layerState.extent;
  var clipped = extent !== undefined;
  if (clipped) {
    var topLeft = ol.extent.getTopLeft(/** @type {ol.Extent} */ (extent));
    var topRight = ol.extent.getTopRight(/** @type {ol.Extent} */ (extent));
    var bottomRight = ol.extent.getBottomRight(/** @type {ol.Extent} */ (extent));
    var bottomLeft = ol.extent.getBottomLeft(/** @type {ol.Extent} */ (extent));

    ol.transform.apply(frameState.coordinateToPixelTransform, topLeft);
    ol.transform.apply(frameState.coordinateToPixelTransform, topRight);
    ol.transform.apply(frameState.coordinateToPixelTransform, bottomRight);
    ol.transform.apply(frameState.coordinateToPixelTransform, bottomLeft);

    var ox = drawOffsetX || 0;
    var oy = drawOffsetY || 0;
    renderContext.save();
    var cx = (renderContext.canvas.width) / 2;
    var cy = (renderContext.canvas.height) / 2;
    ol.render.canvas.rotateAtOffset(renderContext, -rotation, cx, cy);
    renderContext.beginPath();
    renderContext.moveTo(drawScale * (topLeft[0] * pixelRatio + ox),
        drawScale * (topLeft[1] * pixelRatio + oy));
    renderContext.lineTo(drawScale * (topRight[0] * pixelRatio + ox),
        drawScale * (topRight[1] * pixelRatio + oy));
    renderContext.lineTo(drawScale * (bottomRight[0] * pixelRatio + ox),
        drawScale * (bottomRight[1] * pixelRatio + oy));
    renderContext.lineTo(drawScale * (bottomLeft[0] * pixelRatio + ox),
        drawScale * (bottomLeft[1] * pixelRatio + oy));
    renderContext.clip();
    ol.render.canvas.rotateAtOffset(renderContext, rotation, cx, cy);
  }

  for (var i = 0, ii = tilesToDraw.length; i < ii; ++i) {
    var tile = tilesToDraw[i];
    var tileCoord = tile.getTileCoord();
    var tileExtent = tileGrid.getTileCoordExtent(tileCoord, this.tmpExtent);
    var currentZ = tileCoord[0];
    // Calculate all insert points by tile widths from a common origin to avoid
    // gaps caused by rounding
    var origin = ol.extent.getBottomLeft(tileGrid.getTileCoordExtent(
        tileGrid.getTileCoordForCoordAndZ(center, currentZ, this.tmpTileCoord_)));
    var w = Math.round(ol.extent.getWidth(tileExtent) * pixelScale);
    var h = Math.round(ol.extent.getHeight(tileExtent) * pixelScale);
    var left = Math.round((tileExtent[0] - origin[0]) * pixelScale / w) * w +
        offsetX + Math.round((origin[0] - center[0]) * pixelScale);
    var top = Math.round((origin[1] - tileExtent[3]) * pixelScale / h) * h +
        offsetY + Math.round((center[1] - origin[1]) * pixelScale);
    if (!opaque) {
      var pixelExtent = [left, top, left + w, top + h];
      // Create a clip mask for regions in this low resolution tile that are
      // already filled by a higher resolution tile
      renderContext.save();
      for (var j = 0, jj = pixelExtents.length; j < jj; ++j) {
        var clipExtent = pixelExtents[j];
        if (ol.extent.intersects(pixelExtent, clipExtent)) {
          renderContext.beginPath();
          // counter-clockwise (outer ring) for current tile
          renderContext.moveTo(pixelExtent[0], pixelExtent[1]);
          renderContext.lineTo(pixelExtent[0], pixelExtent[3]);
          renderContext.lineTo(pixelExtent[2], pixelExtent[3]);
          renderContext.lineTo(pixelExtent[2], pixelExtent[1]);
          // clockwise (inner ring) for higher resolution tile
          renderContext.moveTo(clipExtent[0], clipExtent[1]);
          renderContext.lineTo(clipExtent[2], clipExtent[1]);
          renderContext.lineTo(clipExtent[2], clipExtent[3]);
          renderContext.lineTo(clipExtent[0], clipExtent[3]);
          renderContext.closePath();
          renderContext.clip();
        }
      }
      pixelExtents.push(pixelExtent);
    }
    var tilePixelSize = source.getTilePixelSize(currentZ, pixelRatio, projection);
    renderContext.drawImage(tile.getImage(), tileGutter, tileGutter,
        tilePixelSize[0], tilePixelSize[1], left, top, w, h);
    if (!opaque) {
      renderContext.restore();
    }
  }

  if (clipped) {
    renderContext.restore();
  }

  if (hasRenderListeners) {
    var dX = drawOffsetX - offsetX / drawScale + offsetX;
    var dY = drawOffsetY - offsetY / drawScale + offsetY;
    var imageTransform = ol.transform.compose(this.imageTransform_,
        drawSize / 2 - dX, drawSize / 2 - dY,
        pixelScale, -pixelScale,
        -rotation,
        -center[0] + dX / pixelScale, -center[1] - dY / pixelScale);
    this.dispatchRenderEvent(renderContext, frameState, imageTransform);
  }
  if (rotation || hasRenderListeners) {
    context.drawImage(renderContext.canvas, -Math.round(drawOffsetX),
        -Math.round(drawOffsetY), drawSize / drawScale, drawSize / drawScale);
  }
  renderContext.globalAlpha = alpha;
};


/**
 * @function
 * @return {ol.layer.Tile|ol.layer.VectorTile}
 */
ol.renderer.canvas.TileLayer.prototype.getLayer;

goog.provide('ol.renderer.canvas.VectorLayer');

goog.require('ol');
goog.require('ol.View');
goog.require('ol.dom');
goog.require('ol.extent');
goog.require('ol.render.EventType');
goog.require('ol.render.canvas');
goog.require('ol.render.canvas.ReplayGroup');
goog.require('ol.renderer.canvas.Layer');
goog.require('ol.renderer.vector');


/**
 * @constructor
 * @extends {ol.renderer.canvas.Layer}
 * @param {ol.layer.Vector} vectorLayer Vector layer.
 */
ol.renderer.canvas.VectorLayer = function(vectorLayer) {

  ol.renderer.canvas.Layer.call(this, vectorLayer);

  /**
   * @private
   * @type {boolean}
   */
  this.dirty_ = false;

  /**
   * @private
   * @type {number}
   */
  this.renderedRevision_ = -1;

  /**
   * @private
   * @type {number}
   */
  this.renderedResolution_ = NaN;

  /**
   * @private
   * @type {ol.Extent}
   */
  this.renderedExtent_ = ol.extent.createEmpty();

  /**
   * @private
   * @type {function(ol.Feature, ol.Feature): number|null}
   */
  this.renderedRenderOrder_ = null;

  /**
   * @private
   * @type {ol.render.canvas.ReplayGroup}
   */
  this.replayGroup_ = null;

  /**
   * @private
   * @type {CanvasRenderingContext2D}
   */
  this.context_ = ol.dom.createCanvasContext2D();

};
ol.inherits(ol.renderer.canvas.VectorLayer, ol.renderer.canvas.Layer);


/**
 * @inheritDoc
 */
ol.renderer.canvas.VectorLayer.prototype.composeFrame = function(frameState, layerState, context) {

  var extent = frameState.extent;
  var pixelRatio = frameState.pixelRatio;
  var skippedFeatureUids = layerState.managed ?
      frameState.skippedFeatureUids : {};
  var viewState = frameState.viewState;
  var projection = viewState.projection;
  var rotation = viewState.rotation;
  var projectionExtent = projection.getExtent();
  var vectorSource = /** @type {ol.source.Vector} */ (this.getLayer().getSource());

  var transform = this.getTransform(frameState, 0);

  this.dispatchPreComposeEvent(context, frameState, transform);

  // clipped rendering if layer extent is set
  var clipExtent = layerState.extent;
  var clipped = clipExtent !== undefined;
  if (clipped) {
    this.clip(context, frameState,  /** @type {ol.Extent} */ (clipExtent));
  }
  var replayGroup = this.replayGroup_;
  if (replayGroup && !replayGroup.isEmpty()) {
    var layer = this.getLayer();
    var drawOffsetX = 0;
    var drawOffsetY = 0;
    var replayContext;
    if (layer.hasListener(ol.render.EventType.RENDER)) {
      var drawWidth = context.canvas.width;
      var drawHeight = context.canvas.height;
      if (rotation) {
        var drawSize = Math.round(Math.sqrt(drawWidth * drawWidth + drawHeight * drawHeight));
        drawOffsetX = (drawSize - drawWidth) / 2;
        drawOffsetY = (drawSize - drawHeight) / 2;
        drawWidth = drawHeight = drawSize;
      }
      // resize and clear
      this.context_.canvas.width = drawWidth;
      this.context_.canvas.height = drawHeight;
      replayContext = this.context_;
    } else {
      replayContext = context;
    }
    // for performance reasons, context.save / context.restore is not used
    // to save and restore the transformation matrix and the opacity.
    // see http://jsperf.com/context-save-restore-versus-variable
    var alpha = replayContext.globalAlpha;
    replayContext.globalAlpha = layerState.opacity;
    if (replayContext != context) {
      replayContext.translate(drawOffsetX, drawOffsetY);
    }

    var width = frameState.size[0] * pixelRatio;
    var height = frameState.size[1] * pixelRatio;
    ol.render.canvas.rotateAtOffset(replayContext, -rotation,
        width / 2, height / 2);
    replayGroup.replay(replayContext, pixelRatio, transform, rotation,
        skippedFeatureUids);
    if (vectorSource.getWrapX() && projection.canWrapX() &&
        !ol.extent.containsExtent(projectionExtent, extent)) {
      var startX = extent[0];
      var worldWidth = ol.extent.getWidth(projectionExtent);
      var world = 0;
      var offsetX;
      while (startX < projectionExtent[0]) {
        --world;
        offsetX = worldWidth * world;
        transform = this.getTransform(frameState, offsetX);
        replayGroup.replay(replayContext, pixelRatio, transform, rotation,
            skippedFeatureUids);
        startX += worldWidth;
      }
      world = 0;
      startX = extent[2];
      while (startX > projectionExtent[2]) {
        ++world;
        offsetX = worldWidth * world;
        transform = this.getTransform(frameState, offsetX);
        replayGroup.replay(replayContext, pixelRatio, transform, rotation,
            skippedFeatureUids);
        startX -= worldWidth;
      }
      // restore original transform for render and compose events
      transform = this.getTransform(frameState, 0);
    }
    ol.render.canvas.rotateAtOffset(replayContext, rotation,
        width / 2, height / 2);

    if (replayContext != context) {
      this.dispatchRenderEvent(replayContext, frameState, transform);
      context.drawImage(replayContext.canvas, -drawOffsetX, -drawOffsetY);
      replayContext.translate(-drawOffsetX, -drawOffsetY);
    }
    replayContext.globalAlpha = alpha;
  }

  if (clipped) {
    context.restore();
  }
  this.dispatchPostComposeEvent(context, frameState, transform);

};


/**
 * @inheritDoc
 */
ol.renderer.canvas.VectorLayer.prototype.forEachFeatureAtCoordinate = function(coordinate, frameState, callback, thisArg) {
  if (!this.replayGroup_) {
    return undefined;
  } else {
    var resolution = frameState.viewState.resolution;
    var rotation = frameState.viewState.rotation;
    var layer = this.getLayer();
    /** @type {Object.<string, boolean>} */
    var features = {};
    return this.replayGroup_.forEachFeatureAtCoordinate(coordinate, resolution,
        rotation, {},
        /**
         * @param {ol.Feature|ol.render.Feature} feature Feature.
         * @return {?} Callback result.
         */
        function(feature) {
          var key = ol.getUid(feature).toString();
          if (!(key in features)) {
            features[key] = true;
            return callback.call(thisArg, feature, layer);
          }
        });
  }
};


/**
 * Handle changes in image style state.
 * @param {ol.events.Event} event Image style change event.
 * @private
 */
ol.renderer.canvas.VectorLayer.prototype.handleStyleImageChange_ = function(event) {
  this.renderIfReadyAndVisible();
};


/**
 * @inheritDoc
 */
ol.renderer.canvas.VectorLayer.prototype.prepareFrame = function(frameState, layerState) {

  var vectorLayer = /** @type {ol.layer.Vector} */ (this.getLayer());
  var vectorSource = vectorLayer.getSource();

  this.updateAttributions(
      frameState.attributions, vectorSource.getAttributions());
  this.updateLogos(frameState, vectorSource);

  var animating = frameState.viewHints[ol.View.Hint.ANIMATING];
  var interacting = frameState.viewHints[ol.View.Hint.INTERACTING];
  var updateWhileAnimating = vectorLayer.getUpdateWhileAnimating();
  var updateWhileInteracting = vectorLayer.getUpdateWhileInteracting();

  if (!this.dirty_ && (!updateWhileAnimating && animating) ||
      (!updateWhileInteracting && interacting)) {
    return true;
  }

  var frameStateExtent = frameState.extent;
  var viewState = frameState.viewState;
  var projection = viewState.projection;
  var resolution = viewState.resolution;
  var pixelRatio = frameState.pixelRatio;
  var vectorLayerRevision = vectorLayer.getRevision();
  var vectorLayerRenderBuffer = vectorLayer.getRenderBuffer();
  var vectorLayerRenderOrder = vectorLayer.getRenderOrder();

  if (vectorLayerRenderOrder === undefined) {
    vectorLayerRenderOrder = ol.renderer.vector.defaultOrder;
  }

  var extent = ol.extent.buffer(frameStateExtent,
      vectorLayerRenderBuffer * resolution);
  var projectionExtent = viewState.projection.getExtent();

  if (vectorSource.getWrapX() && viewState.projection.canWrapX() &&
      !ol.extent.containsExtent(projectionExtent, frameState.extent)) {
    // For the replay group, we need an extent that intersects the real world
    // (-180° to +180°). To support geometries in a coordinate range from -540°
    // to +540°, we add at least 1 world width on each side of the projection
    // extent. If the viewport is wider than the world, we need to add half of
    // the viewport width to make sure we cover the whole viewport.
    var worldWidth = ol.extent.getWidth(projectionExtent);
    var buffer = Math.max(ol.extent.getWidth(extent) / 2, worldWidth);
    extent[0] = projectionExtent[0] - buffer;
    extent[2] = projectionExtent[2] + buffer;
  }

  if (!this.dirty_ &&
      this.renderedResolution_ == resolution &&
      this.renderedRevision_ == vectorLayerRevision &&
      this.renderedRenderOrder_ == vectorLayerRenderOrder &&
      ol.extent.containsExtent(this.renderedExtent_, extent)) {
    return true;
  }

  this.replayGroup_ = null;

  this.dirty_ = false;

  var replayGroup =
      new ol.render.canvas.ReplayGroup(
          ol.renderer.vector.getTolerance(resolution, pixelRatio), extent,
          resolution, vectorSource.getOverlaps(), vectorLayer.getRenderBuffer());
  vectorSource.loadFeatures(extent, resolution, projection);
  /**
   * @param {ol.Feature} feature Feature.
   * @this {ol.renderer.canvas.VectorLayer}
   */
  var renderFeature = function(feature) {
    var styles;
    var styleFunction = feature.getStyleFunction();
    if (styleFunction) {
      styles = styleFunction.call(feature, resolution);
    } else {
      styleFunction = vectorLayer.getStyleFunction();
      if (styleFunction) {
        styles = styleFunction(feature, resolution);
      }
    }
    if (styles) {
      var dirty = this.renderFeature(
          feature, resolution, pixelRatio, styles, replayGroup);
      this.dirty_ = this.dirty_ || dirty;
    }
  };
  if (vectorLayerRenderOrder) {
    /** @type {Array.<ol.Feature>} */
    var features = [];
    vectorSource.forEachFeatureInExtent(extent,
        /**
         * @param {ol.Feature} feature Feature.
         */
        function(feature) {
          features.push(feature);
        }, this);
    features.sort(vectorLayerRenderOrder);
    features.forEach(renderFeature, this);
  } else {
    vectorSource.forEachFeatureInExtent(extent, renderFeature, this);
  }
  replayGroup.finish();

  this.renderedResolution_ = resolution;
  this.renderedRevision_ = vectorLayerRevision;
  this.renderedRenderOrder_ = vectorLayerRenderOrder;
  this.renderedExtent_ = extent;
  this.replayGroup_ = replayGroup;

  return true;
};


/**
 * @param {ol.Feature} feature Feature.
 * @param {number} resolution Resolution.
 * @param {number} pixelRatio Pixel ratio.
 * @param {(ol.style.Style|Array.<ol.style.Style>)} styles The style or array of
 *     styles.
 * @param {ol.render.canvas.ReplayGroup} replayGroup Replay group.
 * @return {boolean} `true` if an image is loading.
 */
ol.renderer.canvas.VectorLayer.prototype.renderFeature = function(feature, resolution, pixelRatio, styles, replayGroup) {
  if (!styles) {
    return false;
  }
  var loading = false;
  if (Array.isArray(styles)) {
    for (var i = 0, ii = styles.length; i < ii; ++i) {
      loading = ol.renderer.vector.renderFeature(
          replayGroup, feature, styles[i],
          ol.renderer.vector.getSquaredTolerance(resolution, pixelRatio),
          this.handleStyleImageChange_, this) || loading;
    }
  } else {
    loading = ol.renderer.vector.renderFeature(
        replayGroup, feature, styles,
        ol.renderer.vector.getSquaredTolerance(resolution, pixelRatio),
        this.handleStyleImageChange_, this) || loading;
  }
  return loading;
};

goog.provide('ol.renderer.canvas.VectorTileLayer');

goog.require('ol');
goog.require('ol.array');
goog.require('ol.extent');
goog.require('ol.proj');
goog.require('ol.proj.Units');
goog.require('ol.render.EventType');
goog.require('ol.render.ReplayType');
goog.require('ol.render.canvas');
goog.require('ol.render.canvas.ReplayGroup');
goog.require('ol.render.replay');
goog.require('ol.renderer.canvas.TileLayer');
goog.require('ol.renderer.vector');
goog.require('ol.size');
goog.require('ol.transform');


/**
 * @const
 * @type {!Object.<string, Array.<ol.render.ReplayType>>}
 */
ol.renderer.canvas.IMAGE_REPLAYS = {
  'image': ol.render.replay.ORDER,
  'hybrid': [ol.render.ReplayType.POLYGON, ol.render.ReplayType.LINE_STRING]
};


/**
 * @const
 * @type {!Object.<string, Array.<ol.render.ReplayType>>}
 */
ol.renderer.canvas.VECTOR_REPLAYS = {
  'hybrid': [ol.render.ReplayType.IMAGE, ol.render.ReplayType.TEXT],
  'vector': ol.render.replay.ORDER
};


/**
 * @constructor
 * @extends {ol.renderer.canvas.TileLayer}
 * @param {ol.layer.VectorTile} layer VectorTile layer.
 */
ol.renderer.canvas.VectorTileLayer = function(layer) {

  ol.renderer.canvas.TileLayer.call(this, layer);

  /**
   * @private
   * @type {boolean}
   */
  this.dirty_ = false;

  /**
   * @private
   * @type {ol.Transform}
   */
  this.tmpTransform_ = ol.transform.create();

  // Use lower resolution for pure vector rendering. Closest resolution otherwise.
  this.zDirection =
      layer.getRenderMode() == ol.layer.VectorTileRenderType.VECTOR ? 1 : 0;

};
ol.inherits(ol.renderer.canvas.VectorTileLayer, ol.renderer.canvas.TileLayer);


/**
 * @inheritDoc
 */
ol.renderer.canvas.VectorTileLayer.prototype.composeFrame = function(
    frameState, layerState, context) {
  var transform = this.getTransform(frameState, 0);
  this.dispatchPreComposeEvent(context, frameState, transform);

  // clipped rendering if layer extent is set
  var extent = layerState.extent;
  var clipped = extent !== undefined;
  if (clipped) {
    this.clip(context, frameState,  /** @type {ol.Extent} */ (extent));
  }

  var renderMode = this.getLayer().getRenderMode();
  if (renderMode !== ol.layer.VectorTileRenderType.VECTOR) {
    this.renderTileImages(context, frameState, layerState);
  }
  if (renderMode !== ol.layer.VectorTileRenderType.IMAGE) {
    this.renderTileReplays_(context, frameState, layerState);
  }

  if (clipped) {
    context.restore();
  }

  this.dispatchPostComposeEvent(context, frameState, transform);
};


/**
 * @param {CanvasRenderingContext2D} context Context.
 * @param {olx.FrameState} frameState Frame state.
 * @param {ol.LayerState} layerState Layer state.
 * @private
 */
ol.renderer.canvas.VectorTileLayer.prototype.renderTileReplays_ = function(
    context, frameState, layerState) {

  var layer = this.getLayer();
  var replays = ol.renderer.canvas.VECTOR_REPLAYS[layer.getRenderMode()];
  var pixelRatio = frameState.pixelRatio;
  var skippedFeatureUids = layerState.managed ?
      frameState.skippedFeatureUids : {};
  var viewState = frameState.viewState;
  var center = viewState.center;
  var resolution = viewState.resolution;
  var rotation = viewState.rotation;
  var size = frameState.size;
  var pixelScale = pixelRatio / resolution;
  var source = /** @type {ol.source.VectorTile} */ (layer.getSource());
  var tilePixelRatio = source.getTilePixelRatio();

  var transform = this.getTransform(frameState, 0);

  var replayContext;
  if (layer.hasListener(ol.render.EventType.RENDER)) {
    // resize and clear
    this.context.canvas.width = context.canvas.width;
    this.context.canvas.height = context.canvas.height;
    replayContext = this.context;
  } else {
    replayContext = context;
  }
  // for performance reasons, context.save / context.restore is not used
  // to save and restore the transformation matrix and the opacity.
  // see http://jsperf.com/context-save-restore-versus-variable
  var alpha = replayContext.globalAlpha;
  replayContext.globalAlpha = layerState.opacity;

  var tilesToDraw = this.renderedTiles;
  var tileGrid = source.getTileGrid();

  var currentZ, i, ii, offsetX, offsetY, origin, pixelSpace, replayState;
  var tile, tileExtent, tilePixelResolution, tileResolution, tileTransform;
  for (i = 0, ii = tilesToDraw.length; i < ii; ++i) {
    tile = tilesToDraw[i];
    replayState = tile.getReplayState();
    tileExtent = tileGrid.getTileCoordExtent(
        tile.getTileCoord(), this.tmpExtent);
    currentZ = tile.getTileCoord()[0];
    pixelSpace = tile.getProjection().getUnits() == ol.proj.Units.TILE_PIXELS;
    tileResolution = tileGrid.getResolution(currentZ);
    tilePixelResolution = tileResolution / tilePixelRatio;
    offsetX = Math.round(pixelRatio * size[0] / 2);
    offsetY = Math.round(pixelRatio * size[1] / 2);

    if (pixelSpace) {
      origin = ol.extent.getTopLeft(tileExtent);
      tileTransform = ol.transform.reset(this.tmpTransform_);
      tileTransform = ol.transform.compose(this.tmpTransform_,
          offsetX, offsetY,
          pixelScale * tilePixelResolution, pixelScale * tilePixelResolution,
          rotation,
          (origin[0] - center[0]) / tilePixelResolution, (center[1] - origin[1]) / tilePixelResolution);
    } else {
      tileTransform = transform;
    }
    ol.render.canvas.rotateAtOffset(replayContext, -rotation, offsetX, offsetY);
    replayState.replayGroup.replay(replayContext, pixelRatio,
        tileTransform, rotation, skippedFeatureUids, replays);
    ol.render.canvas.rotateAtOffset(replayContext, rotation, offsetX, offsetY);
  }

  if (replayContext != context) {
    this.dispatchRenderEvent(replayContext, frameState, transform);
    context.drawImage(replayContext.canvas, 0, 0);
  }
  replayContext.globalAlpha = alpha;
};


/**
 * @param {ol.VectorTile} tile Tile.
 * @param {olx.FrameState} frameState Frame state.
 */
ol.renderer.canvas.VectorTileLayer.prototype.createReplayGroup = function(tile,
    frameState) {
  var layer = this.getLayer();
  var pixelRatio = frameState.pixelRatio;
  var projection = frameState.viewState.projection;
  var revision = layer.getRevision();
  var renderOrder = layer.getRenderOrder() || null;

  var replayState = tile.getReplayState();
  if (!replayState.dirty && replayState.renderedRevision == revision &&
      replayState.renderedRenderOrder == renderOrder) {
    return;
  }

  replayState.replayGroup = null;
  replayState.dirty = false;

  var source = /** @type {ol.source.VectorTile} */ (layer.getSource());
  var tileGrid = source.getTileGrid();
  var tileCoord = tile.getTileCoord();
  var tileProjection = tile.getProjection();
  var pixelSpace = tileProjection.getUnits() == ol.proj.Units.TILE_PIXELS;
  var resolution = tileGrid.getResolution(tileCoord[0]);
  var extent, reproject, tileResolution;
  if (pixelSpace) {
    var tilePixelRatio = tileResolution = source.getTilePixelRatio();
    var tileSize = ol.size.toSize(tileGrid.getTileSize(tileCoord[0]));
    extent = [0, 0, tileSize[0] * tilePixelRatio, tileSize[1] * tilePixelRatio];
  } else {
    tileResolution = resolution;
    extent = tileGrid.getTileCoordExtent(tileCoord);
    if (!ol.proj.equivalent(projection, tileProjection)) {
      reproject = true;
      tile.setProjection(projection);
    }
  }
  replayState.dirty = false;
  var replayGroup = new ol.render.canvas.ReplayGroup(0, extent,
      tileResolution, source.getOverlaps(), layer.getRenderBuffer());
  var squaredTolerance = ol.renderer.vector.getSquaredTolerance(
      tileResolution, pixelRatio);

  /**
   * @param {ol.Feature|ol.render.Feature} feature Feature.
   * @this {ol.renderer.canvas.VectorTileLayer}
   */
  function renderFeature(feature) {
    var styles;
    var styleFunction = feature.getStyleFunction();
    if (styleFunction) {
      styles = styleFunction.call(/** @type {ol.Feature} */ (feature), resolution);
    } else {
      styleFunction = layer.getStyleFunction();
      if (styleFunction) {
        styles = styleFunction(feature, resolution);
      }
    }
    if (styles) {
      if (!Array.isArray(styles)) {
        styles = [styles];
      }
      var dirty = this.renderFeature(feature, squaredTolerance, styles,
          replayGroup);
      this.dirty_ = this.dirty_ || dirty;
      replayState.dirty = replayState.dirty || dirty;
    }
  }

  var features = tile.getFeatures();
  if (renderOrder && renderOrder !== replayState.renderedRenderOrder) {
    features.sort(renderOrder);
  }
  var feature;
  for (var i = 0, ii = features.length; i < ii; ++i) {
    feature = features[i];
    if (reproject) {
      feature.getGeometry().transform(tileProjection, projection);
    }
    renderFeature.call(this, feature);
  }

  replayGroup.finish();

  replayState.renderedRevision = revision;
  replayState.renderedRenderOrder = renderOrder;
  replayState.replayGroup = replayGroup;
  replayState.resolution = NaN;
};


/**
 * @inheritDoc
 */
ol.renderer.canvas.VectorTileLayer.prototype.forEachFeatureAtCoordinate = function(coordinate, frameState, callback, thisArg) {
  var resolution = frameState.viewState.resolution;
  var rotation = frameState.viewState.rotation;
  var layer = this.getLayer();
  /** @type {Object.<string, boolean>} */
  var features = {};

  var replayables = this.renderedTiles;
  var source = /** @type {ol.source.VectorTile} */ (layer.getSource());
  var tileGrid = source.getTileGrid();
  var found, tileSpaceCoordinate;
  var i, ii, origin, replayGroup;
  var tile, tileCoord, tileExtent, tilePixelRatio, tileResolution;
  for (i = 0, ii = replayables.length; i < ii; ++i) {
    tile = replayables[i];
    tileCoord = tile.getTileCoord();
    tileExtent = source.getTileGrid().getTileCoordExtent(tileCoord,
        this.tmpExtent);
    if (!ol.extent.containsCoordinate(tileExtent, coordinate)) {
      continue;
    }
    if (tile.getProjection().getUnits() === ol.proj.Units.TILE_PIXELS) {
      origin = ol.extent.getTopLeft(tileExtent);
      tilePixelRatio = source.getTilePixelRatio();
      tileResolution = tileGrid.getResolution(tileCoord[0]) / tilePixelRatio;
      tileSpaceCoordinate = [
        (coordinate[0] - origin[0]) / tileResolution,
        (origin[1] - coordinate[1]) / tileResolution
      ];
      resolution = tilePixelRatio;
    } else {
      tileSpaceCoordinate = coordinate;
    }
    replayGroup = tile.getReplayState().replayGroup;
    found = found || replayGroup.forEachFeatureAtCoordinate(
        tileSpaceCoordinate, resolution, rotation, {},
        /**
         * @param {ol.Feature|ol.render.Feature} feature Feature.
         * @return {?} Callback result.
         */
        function(feature) {
          var key = ol.getUid(feature).toString();
          if (!(key in features)) {
            features[key] = true;
            return callback.call(thisArg, feature, layer);
          }
        });
  }
  return found;
};


/**
 * Handle changes in image style state.
 * @param {ol.events.Event} event Image style change event.
 * @private
 */
ol.renderer.canvas.VectorTileLayer.prototype.handleStyleImageChange_ = function(event) {
  this.renderIfReadyAndVisible();
};


/**
 * @inheritDoc
 */
ol.renderer.canvas.VectorTileLayer.prototype.prepareFrame = function(frameState, layerState) {
  var prepared = ol.renderer.canvas.TileLayer.prototype.prepareFrame.call(this, frameState, layerState);
  if (prepared) {
    var skippedFeatures = Object.keys(frameState.skippedFeatureUids_ || {});
    for (var i = 0, ii = this.renderedTiles.length; i < ii; ++i) {
      var tile = /** @type {ol.VectorTile} */ (this.renderedTiles[i]);
      this.createReplayGroup(tile, frameState);
      this.renderTileImage_(tile, frameState, layerState, skippedFeatures);
    }
  }
  return prepared;
};


/**
 * @param {ol.Feature|ol.render.Feature} feature Feature.
 * @param {number} squaredTolerance Squared tolerance.
 * @param {(ol.style.Style|Array.<ol.style.Style>)} styles The style or array of
 *     styles.
 * @param {ol.render.canvas.ReplayGroup} replayGroup Replay group.
 * @return {boolean} `true` if an image is loading.
 */
ol.renderer.canvas.VectorTileLayer.prototype.renderFeature = function(feature, squaredTolerance, styles, replayGroup) {
  if (!styles) {
    return false;
  }
  var loading = false;
  if (Array.isArray(styles)) {
    for (var i = 0, ii = styles.length; i < ii; ++i) {
      loading = ol.renderer.vector.renderFeature(
          replayGroup, feature, styles[i], squaredTolerance,
          this.handleStyleImageChange_, this) || loading;
    }
  } else {
    loading = ol.renderer.vector.renderFeature(
        replayGroup, feature, styles, squaredTolerance,
        this.handleStyleImageChange_, this) || loading;
  }
  return loading;
};


/**
 * @param {ol.VectorTile} tile Tile.
 * @param {olx.FrameState} frameState Frame state.
 * @param {ol.LayerState} layerState Layer state.
 * @param {Array.<string>} skippedFeatures Skipped features.
 * @private
 */
ol.renderer.canvas.VectorTileLayer.prototype.renderTileImage_ = function(
    tile, frameState, layerState, skippedFeatures) {
  var layer = this.getLayer();
  var replays = ol.renderer.canvas.IMAGE_REPLAYS[layer.getRenderMode()];
  if (!replays) {
    // do not create an image in 'vector' mode
    return;
  }
  var pixelRatio = frameState.pixelRatio;
  var replayState = tile.getReplayState();
  var revision = layer.getRevision();
  if (!ol.array.equals(replayState.skippedFeatures, skippedFeatures) ||
      replayState.renderedTileRevision !== revision) {
    replayState.skippedFeatures = skippedFeatures;
    replayState.renderedTileRevision = revision;
    var tileContext = tile.getContext();
    var source = layer.getSource();
    var tileGrid = source.getTileGrid();
    var currentZ = tile.getTileCoord()[0];
    var resolution = tileGrid.getResolution(currentZ);
    var tileSize = ol.size.toSize(tileGrid.getTileSize(currentZ));
    var tileResolution = tileGrid.getResolution(currentZ);
    var resolutionRatio = tileResolution / resolution;
    var width = tileSize[0] * pixelRatio * resolutionRatio;
    var height = tileSize[1] * pixelRatio * resolutionRatio;
    tileContext.canvas.width = width / resolutionRatio + 0.5;
    tileContext.canvas.height = height / resolutionRatio + 0.5;
    tileContext.scale(1 / resolutionRatio, 1 / resolutionRatio);
    tileContext.translate(width / 2, height / 2);
    var pixelSpace = tile.getProjection().getUnits() == ol.proj.Units.TILE_PIXELS;
    var pixelScale = pixelRatio / resolution;
    var tilePixelRatio = source.getTilePixelRatio();
    var tilePixelResolution = tileResolution / tilePixelRatio;
    var tileExtent = tileGrid.getTileCoordExtent(
        tile.getTileCoord(), this.tmpExtent);
    var tileTransform = ol.transform.reset(this.tmpTransform_);
    if (pixelSpace) {
      ol.transform.scale(tileTransform,
          pixelScale * tilePixelResolution, pixelScale * tilePixelResolution);
      ol.transform.translate(tileTransform,
          -tileSize[0] * tilePixelRatio / 2, -tileSize[1] * tilePixelRatio / 2);
    } else {
      var tileCenter = ol.extent.getCenter(tileExtent);
      ol.transform.scale(tileTransform, pixelScale, -pixelScale);
      ol.transform.translate(tileTransform, -tileCenter[0], -tileCenter[1]);
    }

    replayState.replayGroup.replay(tileContext, pixelRatio,
        tileTransform, 0, frameState.skippedFeatureUids || {}, replays);
  }
};

// FIXME offset panning

goog.provide('ol.renderer.canvas.Map');

goog.require('ol.transform');
goog.require('ol');
goog.require('ol.RendererType');
goog.require('ol.array');
goog.require('ol.css');
goog.require('ol.dom');
goog.require('ol.layer.Image');
goog.require('ol.layer.Layer');
goog.require('ol.layer.Tile');
goog.require('ol.layer.Vector');
goog.require('ol.layer.VectorTile');
goog.require('ol.render.Event');
goog.require('ol.render.EventType');
goog.require('ol.render.canvas');
goog.require('ol.render.canvas.Immediate');
goog.require('ol.renderer.Map');
goog.require('ol.renderer.canvas.ImageLayer');
goog.require('ol.renderer.canvas.TileLayer');
goog.require('ol.renderer.canvas.VectorLayer');
goog.require('ol.renderer.canvas.VectorTileLayer');
goog.require('ol.source.State');


/**
 * @constructor
 * @extends {ol.renderer.Map}
 * @param {Element} container Container.
 * @param {ol.Map} map Map.
 */
ol.renderer.canvas.Map = function(container, map) {

  ol.renderer.Map.call(this, container, map);

  /**
   * @private
   * @type {CanvasRenderingContext2D}
   */
  this.context_ = ol.dom.createCanvasContext2D();

  /**
   * @private
   * @type {HTMLCanvasElement}
   */
  this.canvas_ = this.context_.canvas;

  this.canvas_.style.width = '100%';
  this.canvas_.style.height = '100%';
  this.canvas_.className = ol.css.CLASS_UNSELECTABLE;
  container.insertBefore(this.canvas_, container.childNodes[0] || null);

  /**
   * @private
   * @type {boolean}
   */
  this.renderedVisible_ = true;

  /**
   * @private
   * @type {ol.Transform}
   */
  this.transform_ = ol.transform.create();

};
ol.inherits(ol.renderer.canvas.Map, ol.renderer.Map);


/**
 * @inheritDoc
 */
ol.renderer.canvas.Map.prototype.createLayerRenderer = function(layer) {
  if (ol.ENABLE_IMAGE && layer instanceof ol.layer.Image) {
    return new ol.renderer.canvas.ImageLayer(layer);
  } else if (ol.ENABLE_TILE && layer instanceof ol.layer.Tile) {
    return new ol.renderer.canvas.TileLayer(layer);
  } else if (ol.ENABLE_VECTOR_TILE && layer instanceof ol.layer.VectorTile) {
    return new ol.renderer.canvas.VectorTileLayer(layer);
  } else if (ol.ENABLE_VECTOR && layer instanceof ol.layer.Vector) {
    return new ol.renderer.canvas.VectorLayer(layer);
  } else {
    goog.DEBUG && console.assert(false, 'unexpected layer configuration');
    return null;
  }
};


/**
 * @param {ol.render.EventType} type Event type.
 * @param {olx.FrameState} frameState Frame state.
 * @private
 */
ol.renderer.canvas.Map.prototype.dispatchComposeEvent_ = function(type, frameState) {
  var map = this.getMap();
  var context = this.context_;
  if (map.hasListener(type)) {
    var extent = frameState.extent;
    var pixelRatio = frameState.pixelRatio;
    var viewState = frameState.viewState;
    var rotation = viewState.rotation;

    var transform = this.getTransform(frameState);

    var vectorContext = new ol.render.canvas.Immediate(context, pixelRatio,
        extent, transform, rotation);
    var composeEvent = new ol.render.Event(type, vectorContext,
        frameState, context, null);
    map.dispatchEvent(composeEvent);
  }
};


/**
 * @param {olx.FrameState} frameState Frame state.
 * @protected
 * @return {!ol.Transform} Transform.
 */
ol.renderer.canvas.Map.prototype.getTransform = function(frameState) {
  var viewState = frameState.viewState;
  var dx1 = this.canvas_.width / 2;
  var dy1 = this.canvas_.height / 2;
  var sx = frameState.pixelRatio / viewState.resolution;
  var sy = -sx;
  var angle = -viewState.rotation;
  var dx2 = -viewState.center[0];
  var dy2 = -viewState.center[1];
  return ol.transform.compose(this.transform_, dx1, dy1, sx, sy, angle, dx2, dy2);
};


/**
 * @inheritDoc
 */
ol.renderer.canvas.Map.prototype.getType = function() {
  return ol.RendererType.CANVAS;
};


/**
 * @inheritDoc
 */
ol.renderer.canvas.Map.prototype.renderFrame = function(frameState) {

  if (!frameState) {
    if (this.renderedVisible_) {
      this.canvas_.style.display = 'none';
      this.renderedVisible_ = false;
    }
    return;
  }

  var context = this.context_;
  var pixelRatio = frameState.pixelRatio;
  var width = Math.round(frameState.size[0] * pixelRatio);
  var height = Math.round(frameState.size[1] * pixelRatio);
  if (this.canvas_.width != width || this.canvas_.height != height) {
    this.canvas_.width = width;
    this.canvas_.height = height;
  } else {
    context.clearRect(0, 0, width, height);
  }

  var rotation = frameState.viewState.rotation;

  this.calculateMatrices2D(frameState);

  this.dispatchComposeEvent_(ol.render.EventType.PRECOMPOSE, frameState);

  var layerStatesArray = frameState.layerStatesArray;
  ol.array.stableSort(layerStatesArray, ol.renderer.Map.sortByZIndex);

  ol.render.canvas.rotateAtOffset(context, rotation, width / 2, height / 2);

  var viewResolution = frameState.viewState.resolution;
  var i, ii, layer, layerRenderer, layerState;
  for (i = 0, ii = layerStatesArray.length; i < ii; ++i) {
    layerState = layerStatesArray[i];
    layer = layerState.layer;
    layerRenderer = /** @type {ol.renderer.canvas.Layer} */ (this.getLayerRenderer(layer));
    if (!ol.layer.Layer.visibleAtResolution(layerState, viewResolution) ||
        layerState.sourceState != ol.source.State.READY) {
      continue;
    }
    if (layerRenderer.prepareFrame(frameState, layerState)) {
      layerRenderer.composeFrame(frameState, layerState, context);
    }
  }

  ol.render.canvas.rotateAtOffset(context, -rotation, width / 2, height / 2);

  this.dispatchComposeEvent_(
      ol.render.EventType.POSTCOMPOSE, frameState);

  if (!this.renderedVisible_) {
    this.canvas_.style.display = '';
    this.renderedVisible_ = true;
  }

  this.scheduleRemoveUnusedLayerRenderers(frameState);
  this.scheduleExpireIconCache(frameState);
};

goog.provide('ol.renderer.dom.Layer');

goog.require('ol');
goog.require('ol.renderer.Layer');


/**
 * @constructor
 * @extends {ol.renderer.Layer}
 * @param {ol.layer.Layer} layer Layer.
 * @param {!Element} target Target.
 */
ol.renderer.dom.Layer = function(layer, target) {

  ol.renderer.Layer.call(this, layer);

  /**
   * @type {!Element}
   * @protected
   */
  this.target = target;

};
ol.inherits(ol.renderer.dom.Layer, ol.renderer.Layer);


/**
 * Clear rendered elements.
 */
ol.renderer.dom.Layer.prototype.clearFrame = ol.nullFunction;


/**
 * @param {olx.FrameState} frameState Frame state.
 * @param {ol.LayerState} layerState Layer state.
 */
ol.renderer.dom.Layer.prototype.composeFrame = ol.nullFunction;


/**
 * @return {!Element} Target.
 */
ol.renderer.dom.Layer.prototype.getTarget = function() {
  return this.target;
};


/**
 * @abstract
 * @param {olx.FrameState} frameState Frame state.
 * @param {ol.LayerState} layerState Layer state.
 * @return {boolean} whether composeFrame should be called.
 */
ol.renderer.dom.Layer.prototype.prepareFrame = function(frameState, layerState) {};

goog.provide('ol.renderer.dom.ImageLayer');

goog.require('ol');
goog.require('ol.View');
goog.require('ol.array');
goog.require('ol.dom');
goog.require('ol.extent');
goog.require('ol.proj');
goog.require('ol.renderer.dom.Layer');
goog.require('ol.transform');


/**
 * @constructor
 * @extends {ol.renderer.dom.Layer}
 * @param {ol.layer.Image} imageLayer Image layer.
 */
ol.renderer.dom.ImageLayer = function(imageLayer) {
  var target = document.createElement('DIV');
  target.style.position = 'absolute';

  ol.renderer.dom.Layer.call(this, imageLayer, target);

  /**
   * The last rendered image.
   * @private
   * @type {?ol.ImageBase}
   */
  this.image_ = null;

  /**
   * @private
   * @type {ol.Transform}
   */
  this.transform_ = ol.transform.create();

};
ol.inherits(ol.renderer.dom.ImageLayer, ol.renderer.dom.Layer);


/**
 * @inheritDoc
 */
ol.renderer.dom.ImageLayer.prototype.forEachFeatureAtCoordinate = function(coordinate, frameState, callback, thisArg) {
  var layer = this.getLayer();
  var source = layer.getSource();
  var resolution = frameState.viewState.resolution;
  var rotation = frameState.viewState.rotation;
  var skippedFeatureUids = frameState.skippedFeatureUids;
  return source.forEachFeatureAtCoordinate(
      coordinate, resolution, rotation, skippedFeatureUids,
      /**
       * @param {ol.Feature|ol.render.Feature} feature Feature.
       * @return {?} Callback result.
       */
      function(feature) {
        return callback.call(thisArg, feature, layer);
      });
};


/**
 * @inheritDoc
 */
ol.renderer.dom.ImageLayer.prototype.clearFrame = function() {
  ol.dom.removeChildren(this.target);
  this.image_ = null;
};


/**
 * @inheritDoc
 */
ol.renderer.dom.ImageLayer.prototype.prepareFrame = function(frameState, layerState) {

  var viewState = frameState.viewState;
  var viewCenter = viewState.center;
  var viewResolution = viewState.resolution;
  var viewRotation = viewState.rotation;

  var image = this.image_;
  var imageLayer = /** @type {ol.layer.Image} */ (this.getLayer());
  var imageSource = imageLayer.getSource();

  var hints = frameState.viewHints;

  var renderedExtent = frameState.extent;
  if (layerState.extent !== undefined) {
    renderedExtent = ol.extent.getIntersection(
        renderedExtent, layerState.extent);
  }

  if (!hints[ol.View.Hint.ANIMATING] && !hints[ol.View.Hint.INTERACTING] &&
      !ol.extent.isEmpty(renderedExtent)) {
    var projection = viewState.projection;
    if (!ol.ENABLE_RASTER_REPROJECTION) {
      var sourceProjection = imageSource.getProjection();
      if (sourceProjection) {
        goog.DEBUG && console.assert(ol.proj.equivalent(projection, sourceProjection),
            'projection and sourceProjection are equivalent');
        projection = sourceProjection;
      }
    }
    var image_ = imageSource.getImage(renderedExtent, viewResolution,
        frameState.pixelRatio, projection);
    if (image_) {
      var loaded = this.loadImage(image_);
      if (loaded) {
        image = image_;
      }
    }
  }

  if (image) {
    var imageExtent = image.getExtent();
    var imageResolution = image.getResolution();
    var transform = ol.transform.create();
    ol.transform.compose(transform,
        frameState.size[0] / 2, frameState.size[1] / 2,
        imageResolution / viewResolution, imageResolution / viewResolution,
        viewRotation,
        (imageExtent[0] - viewCenter[0]) / imageResolution,
        (viewCenter[1] - imageExtent[3]) / imageResolution);

    if (image != this.image_) {
      var imageElement = image.getImage(this);
      // Bootstrap sets the style max-width: 100% for all images, which breaks
      // prevents the image from being displayed in FireFox.  Workaround by
      // overriding the max-width style.
      imageElement.style.maxWidth = 'none';
      imageElement.style.position = 'absolute';
      ol.dom.removeChildren(this.target);
      this.target.appendChild(imageElement);
      this.image_ = image;
    }
    this.setTransform_(transform);
    this.updateAttributions(frameState.attributions, image.getAttributions());
    this.updateLogos(frameState, imageSource);
  }

  return true;
};


/**
 * @param {ol.Transform} transform Transform.
 * @private
 */
ol.renderer.dom.ImageLayer.prototype.setTransform_ = function(transform) {
  if (!ol.array.equals(transform, this.transform_)) {
    ol.dom.transformElement2D(this.target, transform, 6);
    ol.transform.setFromArray(this.transform_, transform);
  }
};

// FIXME probably need to reset TileLayerZ if offsets get too large
// FIXME when zooming out, preserve higher Z divs to avoid white flash

goog.provide('ol.renderer.dom.TileLayer');

goog.require('ol');
goog.require('ol.Tile');
goog.require('ol.TileRange');
goog.require('ol.View');
goog.require('ol.array');
goog.require('ol.dom');
goog.require('ol.extent');
goog.require('ol.renderer.dom.Layer');
goog.require('ol.size');
goog.require('ol.transform');


/**
 * @constructor
 * @extends {ol.renderer.dom.Layer}
 * @param {ol.layer.Tile} tileLayer Tile layer.
 */
ol.renderer.dom.TileLayer = function(tileLayer) {

  var target = document.createElement('DIV');
  target.style.position = 'absolute';

  ol.renderer.dom.Layer.call(this, tileLayer, target);

  /**
   * @private
   * @type {boolean}
   */
  this.renderedVisible_ = true;

  /**
   * @private
   * @type {number}
   */
  this.renderedOpacity_ = 1;

  /**
   * @private
   * @type {number}
   */
  this.renderedRevision_ = 0;

  /**
   * @private
   * @type {!Object.<number, ol.renderer.dom.TileLayerZ_>}
   */
  this.tileLayerZs_ = {};

};
ol.inherits(ol.renderer.dom.TileLayer, ol.renderer.dom.Layer);


/**
 * @inheritDoc
 */
ol.renderer.dom.TileLayer.prototype.clearFrame = function() {
  ol.dom.removeChildren(this.target);
  this.renderedRevision_ = 0;
};


/**
 * @inheritDoc
 */
ol.renderer.dom.TileLayer.prototype.prepareFrame = function(frameState, layerState) {

  if (!layerState.visible) {
    if (this.renderedVisible_) {
      this.target.style.display = 'none';
      this.renderedVisible_ = false;
    }
    return true;
  }

  var pixelRatio = frameState.pixelRatio;
  var viewState = frameState.viewState;
  var projection = viewState.projection;

  var tileLayer = /** @type {ol.layer.Tile} */ (this.getLayer());
  var tileSource = tileLayer.getSource();
  var tileGrid = tileSource.getTileGridForProjection(projection);
  var tileGutter = pixelRatio * tileSource.getGutter(projection);
  var z = tileGrid.getZForResolution(viewState.resolution);
  var tileResolution = tileGrid.getResolution(z);
  var center = viewState.center;
  var extent;
  if (tileResolution == viewState.resolution) {
    center = this.snapCenterToPixel(center, tileResolution, frameState.size);
    extent = ol.extent.getForViewAndSize(
        center, tileResolution, viewState.rotation, frameState.size);
  } else {
    extent = frameState.extent;
  }

  if (layerState.extent !== undefined) {
    extent = ol.extent.getIntersection(extent, layerState.extent);
  }

  var tileRange = tileGrid.getTileRangeForExtentAndResolution(
      extent, tileResolution);

  /** @type {Object.<number, Object.<string, ol.Tile>>} */
  var tilesToDrawByZ = {};
  tilesToDrawByZ[z] = {};

  var findLoadedTiles = this.createLoadedTileFinder(
      tileSource, projection, tilesToDrawByZ);

  var useInterimTilesOnError = tileLayer.getUseInterimTilesOnError();

  var tmpExtent = ol.extent.createEmpty();
  var tmpTileRange = new ol.TileRange(0, 0, 0, 0);
  var childTileRange, drawable, fullyLoaded, tile, tileState, x, y;
  for (x = tileRange.minX; x <= tileRange.maxX; ++x) {
    for (y = tileRange.minY; y <= tileRange.maxY; ++y) {
      tile = tileSource.getTile(z, x, y, pixelRatio, projection);
      tileState = tile.getState();
      drawable = tileState == ol.Tile.State.LOADED ||
          tileState == ol.Tile.State.EMPTY ||
          tileState == ol.Tile.State.ERROR && !useInterimTilesOnError;
      if (!drawable && tile.interimTile) {
        tile = tile.interimTile;
      }
      tileState = tile.getState();
      if (tileState == ol.Tile.State.LOADED) {
        tilesToDrawByZ[z][tile.tileCoord.toString()] = tile;
        continue;
      } else if (tileState == ol.Tile.State.EMPTY ||
                 (tileState == ol.Tile.State.ERROR &&
                  !useInterimTilesOnError)) {
        continue;
      }
      fullyLoaded = tileGrid.forEachTileCoordParentTileRange(
          tile.tileCoord, findLoadedTiles, null, tmpTileRange, tmpExtent);
      if (!fullyLoaded) {
        childTileRange = tileGrid.getTileCoordChildTileRange(
            tile.tileCoord, tmpTileRange, tmpExtent);
        if (childTileRange) {
          findLoadedTiles(z + 1, childTileRange);
        }
      }

    }

  }

  // If the tile source revision changes, we destroy the existing DOM structure
  // so that a new one will be created.  It would be more efficient to modify
  // the existing structure.
  var tileLayerZ, tileLayerZKey;
  if (this.renderedRevision_ != tileSource.getRevision()) {
    for (tileLayerZKey in this.tileLayerZs_) {
      tileLayerZ = this.tileLayerZs_[+tileLayerZKey];
      ol.dom.removeNode(tileLayerZ.target);
    }
    this.tileLayerZs_ = {};
    this.renderedRevision_ = tileSource.getRevision();
  }

  /** @type {Array.<number>} */
  var zs = Object.keys(tilesToDrawByZ).map(Number);
  zs.sort(ol.array.numberSafeCompareFunction);

  /** @type {Object.<number, boolean>} */
  var newTileLayerZKeys = {};

  var iz, iziz, tileCoordKey, tileCoordOrigin, tilesToDraw;
  for (iz = 0, iziz = zs.length; iz < iziz; ++iz) {
    tileLayerZKey = zs[iz];
    if (tileLayerZKey in this.tileLayerZs_) {
      tileLayerZ = this.tileLayerZs_[tileLayerZKey];
    } else {
      tileCoordOrigin =
          tileGrid.getTileCoordForCoordAndZ(center, tileLayerZKey);
      tileLayerZ = new ol.renderer.dom.TileLayerZ_(tileGrid, tileCoordOrigin);
      newTileLayerZKeys[tileLayerZKey] = true;
      this.tileLayerZs_[tileLayerZKey] = tileLayerZ;
    }
    tilesToDraw = tilesToDrawByZ[tileLayerZKey];
    for (tileCoordKey in tilesToDraw) {
      tileLayerZ.addTile(tilesToDraw[tileCoordKey], tileGutter);
    }
    tileLayerZ.finalizeAddTiles();
  }

  /** @type {Array.<number>} */
  var tileLayerZKeys = Object.keys(this.tileLayerZs_).map(Number);
  tileLayerZKeys.sort(ol.array.numberSafeCompareFunction);

  var i, ii, j, origin, resolution;
  var transform = ol.transform.create();
  for (i = 0, ii = tileLayerZKeys.length; i < ii; ++i) {
    tileLayerZKey = tileLayerZKeys[i];
    tileLayerZ = this.tileLayerZs_[tileLayerZKey];
    if (!(tileLayerZKey in tilesToDrawByZ)) {
      ol.dom.removeNode(tileLayerZ.target);
      delete this.tileLayerZs_[tileLayerZKey];
      continue;
    }
    resolution = tileLayerZ.getResolution();
    origin = tileLayerZ.getOrigin();

    ol.transform.compose(transform,
        frameState.size[0] / 2, frameState.size[1] / 2,
        resolution / viewState.resolution, resolution / viewState.resolution,
        viewState.rotation,
        (origin[0] - center[0]) / resolution, (center[1] - origin[1]) / resolution);

    tileLayerZ.setTransform(transform);
    if (tileLayerZKey in newTileLayerZKeys) {
      for (j = tileLayerZKey - 1; j >= 0; --j) {
        if (j in this.tileLayerZs_) {
          if (this.tileLayerZs_[j].target.parentNode) {
            this.tileLayerZs_[j].target.parentNode.insertBefore(tileLayerZ.target, this.tileLayerZs_[j].target.nextSibling);
          }
          break;
        }
      }
      if (j < 0) {
        this.target.insertBefore(tileLayerZ.target, this.target.childNodes[0] || null);
      }
    } else {
      if (!frameState.viewHints[ol.View.Hint.ANIMATING] &&
          !frameState.viewHints[ol.View.Hint.INTERACTING]) {
        tileLayerZ.removeTilesOutsideExtent(extent, tmpTileRange);
      }
    }
  }

  if (layerState.opacity != this.renderedOpacity_) {
    this.target.style.opacity = layerState.opacity;
    this.renderedOpacity_ = layerState.opacity;
  }

  if (layerState.visible && !this.renderedVisible_) {
    this.target.style.display = '';
    this.renderedVisible_ = true;
  }

  this.updateUsedTiles(frameState.usedTiles, tileSource, z, tileRange);
  this.manageTilePyramid(frameState, tileSource, tileGrid, pixelRatio,
      projection, extent, z, tileLayer.getPreload());
  this.scheduleExpireCache(frameState, tileSource);
  this.updateLogos(frameState, tileSource);

  return true;
};


/**
 * @constructor
 * @private
 * @param {ol.tilegrid.TileGrid} tileGrid Tile grid.
 * @param {ol.TileCoord} tileCoordOrigin Tile coord origin.
 */
ol.renderer.dom.TileLayerZ_ = function(tileGrid, tileCoordOrigin) {

  /**
   * @type {!Element}
   */
  this.target = document.createElement('DIV');
  this.target.style.position = 'absolute';
  this.target.style.width = '100%';
  this.target.style.height = '100%';

  /**
   * @private
   * @type {ol.tilegrid.TileGrid}
   */
  this.tileGrid_ = tileGrid;

  /**
   * @private
   * @type {ol.TileCoord}
   */
  this.tileCoordOrigin_ = tileCoordOrigin;

  /**
   * @private
   * @type {ol.Coordinate}
   */
  this.origin_ =
      ol.extent.getTopLeft(tileGrid.getTileCoordExtent(tileCoordOrigin));

  /**
   * @private
   * @type {number}
   */
  this.resolution_ = tileGrid.getResolution(tileCoordOrigin[0]);

  /**
   * @private
   * @type {Object.<string, ol.Tile>}
   */
  this.tiles_ = {};

  /**
   * @private
   * @type {DocumentFragment}
   */
  this.documentFragment_ = null;

  /**
   * @private
   * @type {ol.Transform}
   */
  this.transform_ = ol.transform.create();

  /**
   * @private
   * @type {ol.Size}
   */
  this.tmpSize_ = [0, 0];

};


/**
 * @param {ol.Tile} tile Tile.
 * @param {number} tileGutter Tile gutter.
 */
ol.renderer.dom.TileLayerZ_.prototype.addTile = function(tile, tileGutter) {
  var tileCoord = tile.tileCoord;
  var tileCoordZ = tileCoord[0];
  var tileCoordX = tileCoord[1];
  var tileCoordY = tileCoord[2];
  goog.DEBUG && console.assert(tileCoordZ == this.tileCoordOrigin_[0],
      'tileCoordZ matches z of tileCoordOrigin');
  var tileCoordKey = tileCoord.toString();
  if (tileCoordKey in this.tiles_) {
    return;
  }
  var tileSize = ol.size.toSize(
      this.tileGrid_.getTileSize(tileCoordZ), this.tmpSize_);
  var image = tile.getImage(this);
  var imageStyle = image.style;
  // Bootstrap sets the style max-width: 100% for all images, which
  // prevents the tile from being displayed in FireFox.  Workaround
  // by overriding the max-width style.
  imageStyle.maxWidth = 'none';
  var tileElement;
  var tileElementStyle;
  if (tileGutter > 0) {
    tileElement = document.createElement('DIV');
    tileElementStyle = tileElement.style;
    tileElementStyle.overflow = 'hidden';
    tileElementStyle.width = tileSize[0] + 'px';
    tileElementStyle.height = tileSize[1] + 'px';
    imageStyle.position = 'absolute';
    imageStyle.left = -tileGutter + 'px';
    imageStyle.top = -tileGutter + 'px';
    imageStyle.width = (tileSize[0] + 2 * tileGutter) + 'px';
    imageStyle.height = (tileSize[1] + 2 * tileGutter) + 'px';
    tileElement.appendChild(image);
  } else {
    imageStyle.width = tileSize[0] + 'px';
    imageStyle.height = tileSize[1] + 'px';
    tileElement = image;
    tileElementStyle = imageStyle;
  }
  tileElementStyle.position = 'absolute';
  tileElementStyle.left =
      ((tileCoordX - this.tileCoordOrigin_[1]) * tileSize[0]) + 'px';
  tileElementStyle.top =
      ((this.tileCoordOrigin_[2] - tileCoordY) * tileSize[1]) + 'px';
  if (!this.documentFragment_) {
    this.documentFragment_ = document.createDocumentFragment();
  }
  this.documentFragment_.appendChild(tileElement);
  this.tiles_[tileCoordKey] = tile;
};


/**
 * FIXME empty description for jsdoc
 */
ol.renderer.dom.TileLayerZ_.prototype.finalizeAddTiles = function() {
  if (this.documentFragment_) {
    this.target.appendChild(this.documentFragment_);
    this.documentFragment_ = null;
  }
};


/**
 * @return {ol.Coordinate} Origin.
 */
ol.renderer.dom.TileLayerZ_.prototype.getOrigin = function() {
  return this.origin_;
};


/**
 * @return {number} Resolution.
 */
ol.renderer.dom.TileLayerZ_.prototype.getResolution = function() {
  return this.resolution_;
};


/**
 * @param {ol.Extent} extent Extent.
 * @param {ol.TileRange=} opt_tileRange Temporary ol.TileRange object.
 */
ol.renderer.dom.TileLayerZ_.prototype.removeTilesOutsideExtent = function(extent, opt_tileRange) {
  var tileRange = this.tileGrid_.getTileRangeForExtentAndZ(
      extent, this.tileCoordOrigin_[0], opt_tileRange);
  /** @type {Array.<ol.Tile>} */
  var tilesToRemove = [];
  var tile, tileCoordKey;
  for (tileCoordKey in this.tiles_) {
    tile = this.tiles_[tileCoordKey];
    if (!tileRange.contains(tile.tileCoord)) {
      tilesToRemove.push(tile);
    }
  }
  var i, ii;
  for (i = 0, ii = tilesToRemove.length; i < ii; ++i) {
    tile = tilesToRemove[i];
    tileCoordKey = tile.tileCoord.toString();
    ol.dom.removeNode(tile.getImage(this));
    delete this.tiles_[tileCoordKey];
  }
};


/**
 * @param {ol.Transform} transform Transform.
 */
ol.renderer.dom.TileLayerZ_.prototype.setTransform = function(transform) {
  if (!ol.array.equals(transform, this.transform_)) {
    ol.dom.transformElement2D(this.target, transform, 6);
    ol.transform.setFromArray(this.transform_, transform);
  }
};

goog.provide('ol.renderer.dom.VectorLayer');

goog.require('ol');
goog.require('ol.View');
goog.require('ol.dom');
goog.require('ol.extent');
goog.require('ol.render.Event');
goog.require('ol.render.EventType');
goog.require('ol.render.canvas.Immediate');
goog.require('ol.render.canvas.ReplayGroup');
goog.require('ol.renderer.dom.Layer');
goog.require('ol.renderer.vector');
goog.require('ol.transform');


/**
 * @constructor
 * @extends {ol.renderer.dom.Layer}
 * @param {ol.layer.Vector} vectorLayer Vector layer.
 */
ol.renderer.dom.VectorLayer = function(vectorLayer) {

  /**
   * @private
   * @type {CanvasRenderingContext2D}
   */
  this.context_ = ol.dom.createCanvasContext2D();

  var target = this.context_.canvas;
  // Bootstrap sets the style max-width: 100% for all images, which breaks
  // prevents the image from being displayed in FireFox.  Workaround by
  // overriding the max-width style.
  target.style.maxWidth = 'none';
  target.style.position = 'absolute';

  ol.renderer.dom.Layer.call(this, vectorLayer, target);

  /**
   * @private
   * @type {boolean}
   */
  this.dirty_ = false;

  /**
   * @private
   * @type {number}
   */
  this.renderedRevision_ = -1;

  /**
   * @private
   * @type {number}
   */
  this.renderedResolution_ = NaN;

  /**
   * @private
   * @type {ol.Extent}
   */
  this.renderedExtent_ = ol.extent.createEmpty();

  /**
   * @private
   * @type {function(ol.Feature, ol.Feature): number|null}
   */
  this.renderedRenderOrder_ = null;

  /**
   * @private
   * @type {ol.render.canvas.ReplayGroup}
   */
  this.replayGroup_ = null;

  /**
   * @private
   * @type {ol.Transform}
   */
  this.transform_ = ol.transform.create();

  /**
   * @private
   * @type {ol.Transform}
   */
  this.elementTransform_ = ol.transform.create();

};
ol.inherits(ol.renderer.dom.VectorLayer, ol.renderer.dom.Layer);


/**
 * @inheritDoc
 */
ol.renderer.dom.VectorLayer.prototype.clearFrame = function() {
  // Clear the canvas
  var canvas = this.context_.canvas;
  canvas.width = canvas.width;
  this.renderedRevision_ = 0;
};


/**
 * @inheritDoc
 */
ol.renderer.dom.VectorLayer.prototype.composeFrame = function(frameState, layerState) {
  var viewState = frameState.viewState;
  var viewCenter = viewState.center;
  var viewRotation = viewState.rotation;
  var viewResolution = viewState.resolution;
  var pixelRatio = frameState.pixelRatio;
  var viewWidth = frameState.size[0];
  var viewHeight = frameState.size[1];
  var imageWidth = viewWidth * pixelRatio;
  var imageHeight = viewHeight * pixelRatio;

  var transform = ol.transform.compose(this.transform_,
      pixelRatio * viewWidth / 2, pixelRatio * viewHeight / 2,
      pixelRatio / viewResolution, -pixelRatio / viewResolution,
      -viewRotation,
      -viewCenter[0], -viewCenter[1]);

  var context = this.context_;

  // Clear the canvas and set the correct size
  context.canvas.width = imageWidth;
  context.canvas.height = imageHeight;

  var elementTransform = ol.transform.reset(this.elementTransform_);
  ol.transform.scale(elementTransform, 1 / pixelRatio, 1 / pixelRatio);
  ol.transform.translate(elementTransform,
      -(imageWidth - viewWidth) / 2 * pixelRatio,
      -(imageHeight - viewHeight) / 2 * pixelRatio);
  ol.dom.transformElement2D(context.canvas, elementTransform, 6);

  this.dispatchEvent_(ol.render.EventType.PRECOMPOSE, frameState, transform);

  var replayGroup = this.replayGroup_;

  if (replayGroup && !replayGroup.isEmpty()) {

    context.globalAlpha = layerState.opacity;
    replayGroup.replay(context, pixelRatio, transform, viewRotation,
        layerState.managed ? frameState.skippedFeatureUids : {});

    this.dispatchEvent_(ol.render.EventType.RENDER, frameState, transform);
  }

  this.dispatchEvent_(ol.render.EventType.POSTCOMPOSE, frameState, transform);
};


/**
 * @param {ol.render.EventType} type Event type.
 * @param {olx.FrameState} frameState Frame state.
 * @param {ol.Transform} transform Transform.
 * @private
 */
ol.renderer.dom.VectorLayer.prototype.dispatchEvent_ = function(type, frameState, transform) {
  var context = this.context_;
  var layer = this.getLayer();
  if (layer.hasListener(type)) {
    var render = new ol.render.canvas.Immediate(
        context, frameState.pixelRatio, frameState.extent, transform,
        frameState.viewState.rotation);
    var event = new ol.render.Event(type, render, frameState, context, null);
    layer.dispatchEvent(event);
  }
};


/**
 * @inheritDoc
 */
ol.renderer.dom.VectorLayer.prototype.forEachFeatureAtCoordinate = function(coordinate, frameState, callback, thisArg) {
  if (!this.replayGroup_) {
    return undefined;
  } else {
    var resolution = frameState.viewState.resolution;
    var rotation = frameState.viewState.rotation;
    var layer = this.getLayer();
    /** @type {Object.<string, boolean>} */
    var features = {};
    return this.replayGroup_.forEachFeatureAtCoordinate(coordinate, resolution,
        rotation, {},
        /**
         * @param {ol.Feature|ol.render.Feature} feature Feature.
         * @return {?} Callback result.
         */
        function(feature) {
          var key = ol.getUid(feature).toString();
          if (!(key in features)) {
            features[key] = true;
            return callback.call(thisArg, feature, layer);
          }
        });
  }
};


/**
 * Handle changes in image style state.
 * @param {ol.events.Event} event Image style change event.
 * @private
 */
ol.renderer.dom.VectorLayer.prototype.handleStyleImageChange_ = function(event) {
  this.renderIfReadyAndVisible();
};


/**
 * @inheritDoc
 */
ol.renderer.dom.VectorLayer.prototype.prepareFrame = function(frameState, layerState) {

  var vectorLayer = /** @type {ol.layer.Vector} */ (this.getLayer());
  var vectorSource = vectorLayer.getSource();

  this.updateAttributions(
      frameState.attributions, vectorSource.getAttributions());
  this.updateLogos(frameState, vectorSource);

  var animating = frameState.viewHints[ol.View.Hint.ANIMATING];
  var interacting = frameState.viewHints[ol.View.Hint.INTERACTING];
  var updateWhileAnimating = vectorLayer.getUpdateWhileAnimating();
  var updateWhileInteracting = vectorLayer.getUpdateWhileInteracting();

  if (!this.dirty_ && (!updateWhileAnimating && animating) ||
      (!updateWhileInteracting && interacting)) {
    return true;
  }

  var frameStateExtent = frameState.extent;
  var viewState = frameState.viewState;
  var projection = viewState.projection;
  var resolution = viewState.resolution;
  var pixelRatio = frameState.pixelRatio;
  var vectorLayerRevision = vectorLayer.getRevision();
  var vectorLayerRenderBuffer = vectorLayer.getRenderBuffer();
  var vectorLayerRenderOrder = vectorLayer.getRenderOrder();

  if (vectorLayerRenderOrder === undefined) {
    vectorLayerRenderOrder = ol.renderer.vector.defaultOrder;
  }

  var extent = ol.extent.buffer(frameStateExtent,
      vectorLayerRenderBuffer * resolution);

  if (!this.dirty_ &&
      this.renderedResolution_ == resolution &&
      this.renderedRevision_ == vectorLayerRevision &&
      this.renderedRenderOrder_ == vectorLayerRenderOrder &&
      ol.extent.containsExtent(this.renderedExtent_, extent)) {
    return true;
  }

  this.replayGroup_ = null;

  this.dirty_ = false;

  var replayGroup =
      new ol.render.canvas.ReplayGroup(
          ol.renderer.vector.getTolerance(resolution, pixelRatio), extent,
          resolution, vectorSource.getOverlaps(), vectorLayer.getRenderBuffer());
  vectorSource.loadFeatures(extent, resolution, projection);
  /**
   * @param {ol.Feature} feature Feature.
   * @this {ol.renderer.dom.VectorLayer}
   */
  var renderFeature = function(feature) {
    var styles;
    var styleFunction = feature.getStyleFunction();
    if (styleFunction) {
      styles = styleFunction.call(feature, resolution);
    } else {
      styleFunction = vectorLayer.getStyleFunction();
      if (styleFunction) {
        styles = styleFunction(feature, resolution);
      }
    }
    if (styles) {
      var dirty = this.renderFeature(
          feature, resolution, pixelRatio, styles, replayGroup);
      this.dirty_ = this.dirty_ || dirty;
    }
  };
  if (vectorLayerRenderOrder) {
    /** @type {Array.<ol.Feature>} */
    var features = [];
    vectorSource.forEachFeatureInExtent(extent,
        /**
         * @param {ol.Feature} feature Feature.
         */
        function(feature) {
          features.push(feature);
        }, this);
    features.sort(vectorLayerRenderOrder);
    features.forEach(renderFeature, this);
  } else {
    vectorSource.forEachFeatureInExtent(extent, renderFeature, this);
  }
  replayGroup.finish();

  this.renderedResolution_ = resolution;
  this.renderedRevision_ = vectorLayerRevision;
  this.renderedRenderOrder_ = vectorLayerRenderOrder;
  this.renderedExtent_ = extent;
  this.replayGroup_ = replayGroup;

  return true;
};


/**
 * @param {ol.Feature} feature Feature.
 * @param {number} resolution Resolution.
 * @param {number} pixelRatio Pixel ratio.
 * @param {(ol.style.Style|Array.<ol.style.Style>)} styles The style or array of
 *     styles.
 * @param {ol.render.canvas.ReplayGroup} replayGroup Replay group.
 * @return {boolean} `true` if an image is loading.
 */
ol.renderer.dom.VectorLayer.prototype.renderFeature = function(feature, resolution, pixelRatio, styles, replayGroup) {
  if (!styles) {
    return false;
  }
  var loading = false;
  if (Array.isArray(styles)) {
    for (var i = 0, ii = styles.length; i < ii; ++i) {
      loading = ol.renderer.vector.renderFeature(
          replayGroup, feature, styles[i],
          ol.renderer.vector.getSquaredTolerance(resolution, pixelRatio),
          this.handleStyleImageChange_, this) || loading;
    }
  } else {
    loading = ol.renderer.vector.renderFeature(
        replayGroup, feature, styles,
        ol.renderer.vector.getSquaredTolerance(resolution, pixelRatio),
        this.handleStyleImageChange_, this) || loading;
  }
  return loading;
};

goog.provide('ol.renderer.dom.Map');

goog.require('ol.events');
goog.require('ol.events.Event');
goog.require('ol.events.EventType');
goog.require('ol.transform');
goog.require('ol');
goog.require('ol.RendererType');
goog.require('ol.array');
goog.require('ol.css');
goog.require('ol.dom');
goog.require('ol.layer.Image');
goog.require('ol.layer.Layer');
goog.require('ol.layer.Tile');
goog.require('ol.layer.Vector');
goog.require('ol.render.Event');
goog.require('ol.render.EventType');
goog.require('ol.render.canvas.Immediate');
goog.require('ol.renderer.Map');
goog.require('ol.renderer.dom.ImageLayer');
goog.require('ol.renderer.dom.TileLayer');
goog.require('ol.renderer.dom.VectorLayer');
goog.require('ol.source.State');


/**
 * @constructor
 * @extends {ol.renderer.Map}
 * @param {Element} container Container.
 * @param {ol.Map} map Map.
 */
ol.renderer.dom.Map = function(container, map) {

  ol.renderer.Map.call(this, container, map);

  /**
   * @private
   * @type {CanvasRenderingContext2D}
   */
  this.context_ = ol.dom.createCanvasContext2D();
  var canvas = this.context_.canvas;
  canvas.style.position = 'absolute';
  canvas.style.width = '100%';
  canvas.style.height = '100%';
  canvas.className = ol.css.CLASS_UNSELECTABLE;
  container.insertBefore(canvas, container.childNodes[0] || null);

  /**
   * @private
   * @type {ol.Transform}
   */
  this.transform_ = ol.transform.create();

  /**
   * @type {!Element}
   * @private
   */
  this.layersPane_ = document.createElement('DIV');
  this.layersPane_.className = ol.css.CLASS_UNSELECTABLE;
  var style = this.layersPane_.style;
  style.position = 'absolute';
  style.width = '100%';
  style.height = '100%';

  // prevent the img context menu on mobile devices
  ol.events.listen(this.layersPane_, ol.events.EventType.TOUCHSTART,
      ol.events.Event.preventDefault);

  container.insertBefore(this.layersPane_, container.childNodes[0] || null);

  /**
   * @private
   * @type {boolean}
   */
  this.renderedVisible_ = true;

};
ol.inherits(ol.renderer.dom.Map, ol.renderer.Map);


/**
 * @inheritDoc
 */
ol.renderer.dom.Map.prototype.disposeInternal = function() {
  ol.dom.removeNode(this.layersPane_);
  ol.renderer.Map.prototype.disposeInternal.call(this);
};


/**
 * @inheritDoc
 */
ol.renderer.dom.Map.prototype.createLayerRenderer = function(layer) {
  var layerRenderer;
  if (ol.ENABLE_IMAGE && layer instanceof ol.layer.Image) {
    layerRenderer = new ol.renderer.dom.ImageLayer(layer);
  } else if (ol.ENABLE_TILE && layer instanceof ol.layer.Tile) {
    layerRenderer = new ol.renderer.dom.TileLayer(layer);
  } else if (ol.ENABLE_VECTOR && layer instanceof ol.layer.Vector) {
    layerRenderer = new ol.renderer.dom.VectorLayer(layer);
  } else {
    goog.DEBUG && console.assert(false, 'unexpected layer configuration');
    return null;
  }
  return layerRenderer;
};


/**
 * @param {ol.render.EventType} type Event type.
 * @param {olx.FrameState} frameState Frame state.
 * @private
 */
ol.renderer.dom.Map.prototype.dispatchComposeEvent_ = function(type, frameState) {
  var map = this.getMap();
  if (map.hasListener(type)) {
    var extent = frameState.extent;
    var pixelRatio = frameState.pixelRatio;
    var viewState = frameState.viewState;
    var rotation = viewState.rotation;
    var context = this.context_;
    var canvas = context.canvas;

    var transform = ol.transform.compose(this.transform_,
        canvas.width / 2, canvas.height / 2,
        pixelRatio / viewState.resolution, -pixelRatio / viewState.resolution,
        -rotation,
        -viewState.center[0], -viewState.center[1]);

    var vectorContext = new ol.render.canvas.Immediate(context, pixelRatio,
        extent, transform, rotation);
    var composeEvent = new ol.render.Event(type, vectorContext,
        frameState, context, null);
    map.dispatchEvent(composeEvent);
  }
};


/**
 * @inheritDoc
 */
ol.renderer.dom.Map.prototype.getType = function() {
  return ol.RendererType.DOM;
};


/**
 * @inheritDoc
 */
ol.renderer.dom.Map.prototype.renderFrame = function(frameState) {

  if (!frameState) {
    if (this.renderedVisible_) {
      this.layersPane_.style.display = 'none';
      this.renderedVisible_ = false;
    }
    return;
  }

  var map = this.getMap();
  if (map.hasListener(ol.render.EventType.PRECOMPOSE) ||
      map.hasListener(ol.render.EventType.POSTCOMPOSE)) {
    var canvas = this.context_.canvas;
    var pixelRatio = frameState.pixelRatio;
    canvas.width = frameState.size[0] * pixelRatio;
    canvas.height = frameState.size[1] * pixelRatio;
  }

  this.dispatchComposeEvent_(ol.render.EventType.PRECOMPOSE, frameState);

  var layerStatesArray = frameState.layerStatesArray;
  ol.array.stableSort(layerStatesArray, ol.renderer.Map.sortByZIndex);

  var viewResolution = frameState.viewState.resolution;
  var i, ii, layer, layerRenderer, layerState;
  for (i = 0, ii = layerStatesArray.length; i < ii; ++i) {
    layerState = layerStatesArray[i];
    layer = layerState.layer;
    layerRenderer = /** @type {ol.renderer.dom.Layer} */ (
        this.getLayerRenderer(layer));
    this.layersPane_.insertBefore(layerRenderer.getTarget(), this.layersPane_.childNodes[i] || null);
    if (ol.layer.Layer.visibleAtResolution(layerState, viewResolution) &&
        layerState.sourceState == ol.source.State.READY) {
      if (layerRenderer.prepareFrame(frameState, layerState)) {
        layerRenderer.composeFrame(frameState, layerState);
      }
    } else {
      layerRenderer.clearFrame();
    }
  }

  var layerStates = frameState.layerStates;
  var layerKey;
  for (layerKey in this.getLayerRenderers()) {
    if (!(layerKey in layerStates)) {
      layerRenderer = /** @type {ol.renderer.dom.Layer} */ (this.getLayerRendererByKey(layerKey));
      ol.dom.removeNode(layerRenderer.getTarget());
    }
  }

  if (!this.renderedVisible_) {
    this.layersPane_.style.display = '';
    this.renderedVisible_ = true;
  }

  this.calculateMatrices2D(frameState);
  this.scheduleRemoveUnusedLayerRenderers(frameState);
  this.scheduleExpireIconCache(frameState);

  this.dispatchComposeEvent_(ol.render.EventType.POSTCOMPOSE, frameState);
};

goog.provide('ol.webgl.Shader');

goog.require('ol.functions');
goog.require('ol.webgl');


/**
 * @constructor
 * @param {string} source Source.
 * @struct
 */
ol.webgl.Shader = function(source) {

  /**
   * @private
   * @type {string}
   */
  this.source_ = source;

};


/**
 * @abstract
 * @return {number} Type.
 */
ol.webgl.Shader.prototype.getType = function() {};


/**
 * @return {string} Source.
 */
ol.webgl.Shader.prototype.getSource = function() {
  return this.source_;
};


/**
 * @return {boolean} Is animated?
 */
ol.webgl.Shader.prototype.isAnimated = ol.functions.FALSE;

goog.provide('ol.webgl.Fragment');

goog.require('ol');
goog.require('ol.webgl');
goog.require('ol.webgl.Shader');


/**
 * @constructor
 * @extends {ol.webgl.Shader}
 * @param {string} source Source.
 * @struct
 */
ol.webgl.Fragment = function(source) {
  ol.webgl.Shader.call(this, source);
};
ol.inherits(ol.webgl.Fragment, ol.webgl.Shader);


/**
 * @inheritDoc
 */
ol.webgl.Fragment.prototype.getType = function() {
  return ol.webgl.FRAGMENT_SHADER;
};

goog.provide('ol.webgl.Vertex');

goog.require('ol');
goog.require('ol.webgl');
goog.require('ol.webgl.Shader');


/**
 * @constructor
 * @extends {ol.webgl.Shader}
 * @param {string} source Source.
 * @struct
 */
ol.webgl.Vertex = function(source) {
  ol.webgl.Shader.call(this, source);
};
ol.inherits(ol.webgl.Vertex, ol.webgl.Shader);


/**
 * @inheritDoc
 */
ol.webgl.Vertex.prototype.getType = function() {
  return ol.webgl.VERTEX_SHADER;
};

// This file is automatically generated, do not edit
goog.provide('ol.render.webgl.imagereplay.defaultshader');

goog.require('ol');
goog.require('ol.webgl.Fragment');
goog.require('ol.webgl.Vertex');


/**
 * @constructor
 * @extends {ol.webgl.Fragment}
 * @struct
 */
ol.render.webgl.imagereplay.defaultshader.Fragment = function() {
  ol.webgl.Fragment.call(this, ol.render.webgl.imagereplay.defaultshader.Fragment.SOURCE);
};
ol.inherits(ol.render.webgl.imagereplay.defaultshader.Fragment, ol.webgl.Fragment);


/**
 * @const
 * @type {string}
 */
ol.render.webgl.imagereplay.defaultshader.Fragment.DEBUG_SOURCE = 'precision mediump float;\nvarying vec2 v_texCoord;\nvarying float v_opacity;\n\nuniform float u_opacity;\nuniform sampler2D u_image;\n\nvoid main(void) {\n  vec4 texColor = texture2D(u_image, v_texCoord);\n  gl_FragColor.rgb = texColor.rgb;\n  float alpha = texColor.a * v_opacity * u_opacity;\n  if (alpha == 0.0) {\n    discard;\n  }\n  gl_FragColor.a = alpha;\n}\n';


/**
 * @const
 * @type {string}
 */
ol.render.webgl.imagereplay.defaultshader.Fragment.OPTIMIZED_SOURCE = 'precision mediump float;varying vec2 a;varying float b;uniform float k;uniform sampler2D l;void main(void){vec4 texColor=texture2D(l,a);gl_FragColor.rgb=texColor.rgb;float alpha=texColor.a*b*k;if(alpha==0.0){discard;}gl_FragColor.a=alpha;}';


/**
 * @const
 * @type {string}
 */
ol.render.webgl.imagereplay.defaultshader.Fragment.SOURCE = goog.DEBUG ?
    ol.render.webgl.imagereplay.defaultshader.Fragment.DEBUG_SOURCE :
    ol.render.webgl.imagereplay.defaultshader.Fragment.OPTIMIZED_SOURCE;


ol.render.webgl.imagereplay.defaultshader.fragment = new ol.render.webgl.imagereplay.defaultshader.Fragment();


/**
 * @constructor
 * @extends {ol.webgl.Vertex}
 * @struct
 */
ol.render.webgl.imagereplay.defaultshader.Vertex = function() {
  ol.webgl.Vertex.call(this, ol.render.webgl.imagereplay.defaultshader.Vertex.SOURCE);
};
ol.inherits(ol.render.webgl.imagereplay.defaultshader.Vertex, ol.webgl.Vertex);


/**
 * @const
 * @type {string}
 */
ol.render.webgl.imagereplay.defaultshader.Vertex.DEBUG_SOURCE = 'varying vec2 v_texCoord;\nvarying float v_opacity;\n\nattribute vec2 a_position;\nattribute vec2 a_texCoord;\nattribute vec2 a_offsets;\nattribute float a_opacity;\nattribute float a_rotateWithView;\n\nuniform mat4 u_projectionMatrix;\nuniform mat4 u_offsetScaleMatrix;\nuniform mat4 u_offsetRotateMatrix;\n\nvoid main(void) {\n  mat4 offsetMatrix = u_offsetScaleMatrix;\n  if (a_rotateWithView == 1.0) {\n    offsetMatrix = u_offsetScaleMatrix * u_offsetRotateMatrix;\n  }\n  vec4 offsets = offsetMatrix * vec4(a_offsets, 0., 0.);\n  gl_Position = u_projectionMatrix * vec4(a_position, 0., 1.) + offsets;\n  v_texCoord = a_texCoord;\n  v_opacity = a_opacity;\n}\n\n\n';


/**
 * @const
 * @type {string}
 */
ol.render.webgl.imagereplay.defaultshader.Vertex.OPTIMIZED_SOURCE = 'varying vec2 a;varying float b;attribute vec2 c;attribute vec2 d;attribute vec2 e;attribute float f;attribute float g;uniform mat4 h;uniform mat4 i;uniform mat4 j;void main(void){mat4 offsetMatrix=i;if(g==1.0){offsetMatrix=i*j;}vec4 offsets=offsetMatrix*vec4(e,0.,0.);gl_Position=h*vec4(c,0.,1.)+offsets;a=d;b=f;}';


/**
 * @const
 * @type {string}
 */
ol.render.webgl.imagereplay.defaultshader.Vertex.SOURCE = goog.DEBUG ?
    ol.render.webgl.imagereplay.defaultshader.Vertex.DEBUG_SOURCE :
    ol.render.webgl.imagereplay.defaultshader.Vertex.OPTIMIZED_SOURCE;


ol.render.webgl.imagereplay.defaultshader.vertex = new ol.render.webgl.imagereplay.defaultshader.Vertex();


/**
 * @constructor
 * @param {WebGLRenderingContext} gl GL.
 * @param {WebGLProgram} program Program.
 * @struct
 */
ol.render.webgl.imagereplay.defaultshader.Locations = function(gl, program) {

  /**
   * @type {WebGLUniformLocation}
   */
  this.u_image = gl.getUniformLocation(
      program, goog.DEBUG ? 'u_image' : 'l');

  /**
   * @type {WebGLUniformLocation}
   */
  this.u_offsetRotateMatrix = gl.getUniformLocation(
      program, goog.DEBUG ? 'u_offsetRotateMatrix' : 'j');

  /**
   * @type {WebGLUniformLocation}
   */
  this.u_offsetScaleMatrix = gl.getUniformLocation(
      program, goog.DEBUG ? 'u_offsetScaleMatrix' : 'i');

  /**
   * @type {WebGLUniformLocation}
   */
  this.u_opacity = gl.getUniformLocation(
      program, goog.DEBUG ? 'u_opacity' : 'k');

  /**
   * @type {WebGLUniformLocation}
   */
  this.u_projectionMatrix = gl.getUniformLocation(
      program, goog.DEBUG ? 'u_projectionMatrix' : 'h');

  /**
   * @type {number}
   */
  this.a_offsets = gl.getAttribLocation(
      program, goog.DEBUG ? 'a_offsets' : 'e');

  /**
   * @type {number}
   */
  this.a_opacity = gl.getAttribLocation(
      program, goog.DEBUG ? 'a_opacity' : 'f');

  /**
   * @type {number}
   */
  this.a_position = gl.getAttribLocation(
      program, goog.DEBUG ? 'a_position' : 'c');

  /**
   * @type {number}
   */
  this.a_rotateWithView = gl.getAttribLocation(
      program, goog.DEBUG ? 'a_rotateWithView' : 'g');

  /**
   * @type {number}
   */
  this.a_texCoord = gl.getAttribLocation(
      program, goog.DEBUG ? 'a_texCoord' : 'd');
};

goog.provide('ol.webgl.Buffer');

goog.require('ol');
goog.require('ol.webgl');


/**
 * @constructor
 * @param {Array.<number>=} opt_arr Array.
 * @param {number=} opt_usage Usage.
 * @struct
 */
ol.webgl.Buffer = function(opt_arr, opt_usage) {

  /**
   * @private
   * @type {Array.<number>}
   */
  this.arr_ = opt_arr !== undefined ? opt_arr : [];

  /**
   * @private
   * @type {number}
   */
  this.usage_ = opt_usage !== undefined ?
      opt_usage : ol.webgl.Buffer.Usage.STATIC_DRAW;

};


/**
 * @return {Array.<number>} Array.
 */
ol.webgl.Buffer.prototype.getArray = function() {
  return this.arr_;
};


/**
 * @return {number} Usage.
 */
ol.webgl.Buffer.prototype.getUsage = function() {
  return this.usage_;
};


/**
 * @enum {number}
 */
ol.webgl.Buffer.Usage = {
  STATIC_DRAW: ol.webgl.STATIC_DRAW,
  STREAM_DRAW: ol.webgl.STREAM_DRAW,
  DYNAMIC_DRAW: ol.webgl.DYNAMIC_DRAW
};

goog.provide('ol.webgl.ContextEventType');


/**
 * @enum {string}
 */
ol.webgl.ContextEventType = {
  LOST: 'webglcontextlost',
  RESTORED: 'webglcontextrestored'
};

goog.provide('ol.webgl.Context');

goog.require('ol');
goog.require('ol.Disposable');
goog.require('ol.array');
goog.require('ol.events');
goog.require('ol.obj');
goog.require('ol.webgl');
goog.require('ol.webgl.ContextEventType');


/**
 * @classdesc
 * A WebGL context for accessing low-level WebGL capabilities.
 *
 * @constructor
 * @extends {ol.Disposable}
 * @param {HTMLCanvasElement} canvas Canvas.
 * @param {WebGLRenderingContext} gl GL.
 */
ol.webgl.Context = function(canvas, gl) {

  /**
   * @private
   * @type {HTMLCanvasElement}
   */
  this.canvas_ = canvas;

  /**
   * @private
   * @type {WebGLRenderingContext}
   */
  this.gl_ = gl;

  /**
   * @private
   * @type {Object.<string, ol.WebglBufferCacheEntry>}
   */
  this.bufferCache_ = {};

  /**
   * @private
   * @type {Object.<string, WebGLShader>}
   */
  this.shaderCache_ = {};

  /**
   * @private
   * @type {Object.<string, WebGLProgram>}
   */
  this.programCache_ = {};

  /**
   * @private
   * @type {WebGLProgram}
   */
  this.currentProgram_ = null;

  /**
   * @private
   * @type {WebGLFramebuffer}
   */
  this.hitDetectionFramebuffer_ = null;

  /**
   * @private
   * @type {WebGLTexture}
   */
  this.hitDetectionTexture_ = null;

  /**
   * @private
   * @type {WebGLRenderbuffer}
   */
  this.hitDetectionRenderbuffer_ = null;

  /**
   * @type {boolean}
   */
  this.hasOESElementIndexUint = ol.array.includes(
      ol.WEBGL_EXTENSIONS, 'OES_element_index_uint');

  // use the OES_element_index_uint extension if available
  if (this.hasOESElementIndexUint) {
    var ext = gl.getExtension('OES_element_index_uint');
    goog.DEBUG && console.assert(ext,
        'Failed to get extension "OES_element_index_uint"');
  }

  ol.events.listen(this.canvas_, ol.webgl.ContextEventType.LOST,
      this.handleWebGLContextLost, this);
  ol.events.listen(this.canvas_, ol.webgl.ContextEventType.RESTORED,
      this.handleWebGLContextRestored, this);

};
ol.inherits(ol.webgl.Context, ol.Disposable);


/**
 * Just bind the buffer if it's in the cache. Otherwise create
 * the WebGL buffer, bind it, populate it, and add an entry to
 * the cache.
 * @param {number} target Target.
 * @param {ol.webgl.Buffer} buf Buffer.
 */
ol.webgl.Context.prototype.bindBuffer = function(target, buf) {
  var gl = this.getGL();
  var arr = buf.getArray();
  var bufferKey = String(ol.getUid(buf));
  if (bufferKey in this.bufferCache_) {
    var bufferCacheEntry = this.bufferCache_[bufferKey];
    gl.bindBuffer(target, bufferCacheEntry.buffer);
  } else {
    var buffer = gl.createBuffer();
    gl.bindBuffer(target, buffer);
    goog.DEBUG && console.assert(target == ol.webgl.ARRAY_BUFFER ||
        target == ol.webgl.ELEMENT_ARRAY_BUFFER,
        'target is supposed to be an ARRAY_BUFFER or ELEMENT_ARRAY_BUFFER');
    var /** @type {ArrayBufferView} */ arrayBuffer;
    if (target == ol.webgl.ARRAY_BUFFER) {
      arrayBuffer = new Float32Array(arr);
    } else if (target == ol.webgl.ELEMENT_ARRAY_BUFFER) {
      arrayBuffer = this.hasOESElementIndexUint ?
          new Uint32Array(arr) : new Uint16Array(arr);
    }
    gl.bufferData(target, arrayBuffer, buf.getUsage());
    this.bufferCache_[bufferKey] = {
      buf: buf,
      buffer: buffer
    };
  }
};


/**
 * @param {ol.webgl.Buffer} buf Buffer.
 */
ol.webgl.Context.prototype.deleteBuffer = function(buf) {
  var gl = this.getGL();
  var bufferKey = String(ol.getUid(buf));
  goog.DEBUG && console.assert(bufferKey in this.bufferCache_,
      'attempted to delete uncached buffer');
  var bufferCacheEntry = this.bufferCache_[bufferKey];
  if (!gl.isContextLost()) {
    gl.deleteBuffer(bufferCacheEntry.buffer);
  }
  delete this.bufferCache_[bufferKey];
};


/**
 * @inheritDoc
 */
ol.webgl.Context.prototype.disposeInternal = function() {
  ol.events.unlistenAll(this.canvas_);
  var gl = this.getGL();
  if (!gl.isContextLost()) {
    var key;
    for (key in this.bufferCache_) {
      gl.deleteBuffer(this.bufferCache_[key].buffer);
    }
    for (key in this.programCache_) {
      gl.deleteProgram(this.programCache_[key]);
    }
    for (key in this.shaderCache_) {
      gl.deleteShader(this.shaderCache_[key]);
    }
    // delete objects for hit-detection
    gl.deleteFramebuffer(this.hitDetectionFramebuffer_);
    gl.deleteRenderbuffer(this.hitDetectionRenderbuffer_);
    gl.deleteTexture(this.hitDetectionTexture_);
  }
};


/**
 * @return {HTMLCanvasElement} Canvas.
 */
ol.webgl.Context.prototype.getCanvas = function() {
  return this.canvas_;
};


/**
 * Get the WebGL rendering context
 * @return {WebGLRenderingContext} The rendering context.
 * @api
 */
ol.webgl.Context.prototype.getGL = function() {
  return this.gl_;
};


/**
 * Get the frame buffer for hit detection.
 * @return {WebGLFramebuffer} The hit detection frame buffer.
 */
ol.webgl.Context.prototype.getHitDetectionFramebuffer = function() {
  if (!this.hitDetectionFramebuffer_) {
    this.initHitDetectionFramebuffer_();
  }
  return this.hitDetectionFramebuffer_;
};


/**
 * Get shader from the cache if it's in the cache. Otherwise, create
 * the WebGL shader, compile it, and add entry to cache.
 * @param {ol.webgl.Shader} shaderObject Shader object.
 * @return {WebGLShader} Shader.
 */
ol.webgl.Context.prototype.getShader = function(shaderObject) {
  var shaderKey = String(ol.getUid(shaderObject));
  if (shaderKey in this.shaderCache_) {
    return this.shaderCache_[shaderKey];
  } else {
    var gl = this.getGL();
    var shader = gl.createShader(shaderObject.getType());
    gl.shaderSource(shader, shaderObject.getSource());
    gl.compileShader(shader);
    goog.DEBUG && console.assert(
        gl.getShaderParameter(shader, ol.webgl.COMPILE_STATUS) ||
        gl.isContextLost(),
        gl.getShaderInfoLog(shader) || 'illegal state, shader not compiled or context lost');
    this.shaderCache_[shaderKey] = shader;
    return shader;
  }
};


/**
 * Get the program from the cache if it's in the cache. Otherwise create
 * the WebGL program, attach the shaders to it, and add an entry to the
 * cache.
 * @param {ol.webgl.Fragment} fragmentShaderObject Fragment shader.
 * @param {ol.webgl.Vertex} vertexShaderObject Vertex shader.
 * @return {WebGLProgram} Program.
 */
ol.webgl.Context.prototype.getProgram = function(
    fragmentShaderObject, vertexShaderObject) {
  var programKey =
      ol.getUid(fragmentShaderObject) + '/' + ol.getUid(vertexShaderObject);
  if (programKey in this.programCache_) {
    return this.programCache_[programKey];
  } else {
    var gl = this.getGL();
    var program = gl.createProgram();
    gl.attachShader(program, this.getShader(fragmentShaderObject));
    gl.attachShader(program, this.getShader(vertexShaderObject));
    gl.linkProgram(program);
    goog.DEBUG && console.assert(
        gl.getProgramParameter(program, ol.webgl.LINK_STATUS) ||
        gl.isContextLost(),
        gl.getProgramInfoLog(program) || 'illegal state, shader not linked or context lost');
    this.programCache_[programKey] = program;
    return program;
  }
};


/**
 * FIXME empy description for jsdoc
 */
ol.webgl.Context.prototype.handleWebGLContextLost = function() {
  ol.obj.clear(this.bufferCache_);
  ol.obj.clear(this.shaderCache_);
  ol.obj.clear(this.programCache_);
  this.currentProgram_ = null;
  this.hitDetectionFramebuffer_ = null;
  this.hitDetectionTexture_ = null;
  this.hitDetectionRenderbuffer_ = null;
};


/**
 * FIXME empy description for jsdoc
 */
ol.webgl.Context.prototype.handleWebGLContextRestored = function() {
};


/**
 * Creates a 1x1 pixel framebuffer for the hit-detection.
 * @private
 */
ol.webgl.Context.prototype.initHitDetectionFramebuffer_ = function() {
  var gl = this.gl_;
  var framebuffer = gl.createFramebuffer();
  gl.bindFramebuffer(gl.FRAMEBUFFER, framebuffer);

  var texture = ol.webgl.Context.createEmptyTexture(gl, 1, 1);
  var renderbuffer = gl.createRenderbuffer();
  gl.bindRenderbuffer(gl.RENDERBUFFER, renderbuffer);
  gl.renderbufferStorage(gl.RENDERBUFFER, gl.DEPTH_COMPONENT16, 1, 1);
  gl.framebufferTexture2D(
      gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, 0);
  gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT,
      gl.RENDERBUFFER, renderbuffer);

  gl.bindTexture(gl.TEXTURE_2D, null);
  gl.bindRenderbuffer(gl.RENDERBUFFER, null);
  gl.bindFramebuffer(gl.FRAMEBUFFER, null);

  this.hitDetectionFramebuffer_ = framebuffer;
  this.hitDetectionTexture_ = texture;
  this.hitDetectionRenderbuffer_ = renderbuffer;
};


/**
 * Use a program.  If the program is already in use, this will return `false`.
 * @param {WebGLProgram} program Program.
 * @return {boolean} Changed.
 * @api
 */
ol.webgl.Context.prototype.useProgram = function(program) {
  if (program == this.currentProgram_) {
    return false;
  } else {
    var gl = this.getGL();
    gl.useProgram(program);
    this.currentProgram_ = program;
    return true;
  }
};


/**
 * @param {WebGLRenderingContext} gl WebGL rendering context.
 * @param {number=} opt_wrapS wrapS.
 * @param {number=} opt_wrapT wrapT.
 * @return {WebGLTexture} The texture.
 * @private
 */
ol.webgl.Context.createTexture_ = function(gl, opt_wrapS, opt_wrapT) {
  var texture = gl.createTexture();
  gl.bindTexture(gl.TEXTURE_2D, texture);
  gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
  gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);

  if (opt_wrapS !== undefined) {
    gl.texParameteri(
        ol.webgl.TEXTURE_2D, ol.webgl.TEXTURE_WRAP_S, opt_wrapS);
  }
  if (opt_wrapT !== undefined) {
    gl.texParameteri(
        ol.webgl.TEXTURE_2D, ol.webgl.TEXTURE_WRAP_T, opt_wrapT);
  }

  return texture;
};


/**
 * @param {WebGLRenderingContext} gl WebGL rendering context.
 * @param {number} width Width.
 * @param {number} height Height.
 * @param {number=} opt_wrapS wrapS.
 * @param {number=} opt_wrapT wrapT.
 * @return {WebGLTexture} The texture.
 */
ol.webgl.Context.createEmptyTexture = function(
    gl, width, height, opt_wrapS, opt_wrapT) {
  var texture = ol.webgl.Context.createTexture_(gl, opt_wrapS, opt_wrapT);
  gl.texImage2D(
      gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE,
      null);

  return texture;
};


/**
 * @param {WebGLRenderingContext} gl WebGL rendering context.
 * @param {HTMLCanvasElement|HTMLImageElement|HTMLVideoElement} image Image.
 * @param {number=} opt_wrapS wrapS.
 * @param {number=} opt_wrapT wrapT.
 * @return {WebGLTexture} The texture.
 */
ol.webgl.Context.createTexture = function(gl, image, opt_wrapS, opt_wrapT) {
  var texture = ol.webgl.Context.createTexture_(gl, opt_wrapS, opt_wrapT);
  gl.texImage2D(
      gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, image);

  return texture;
};

goog.provide('ol.render.webgl.ImageReplay');
goog.provide('ol.render.webgl.ReplayGroup');

goog.require('ol');
goog.require('ol.extent');
goog.require('ol.obj');
goog.require('ol.render.ReplayGroup');
goog.require('ol.render.VectorContext');
goog.require('ol.render.replay');
goog.require('ol.render.webgl.imagereplay.defaultshader');
goog.require('ol.transform');
goog.require('ol.vec.Mat4');
goog.require('ol.webgl');
goog.require('ol.webgl.Buffer');
goog.require('ol.webgl.Context');


/**
 * @constructor
 * @extends {ol.render.VectorContext}
 * @param {number} tolerance Tolerance.
 * @param {ol.Extent} maxExtent Max extent.
 * @protected
 * @struct
 */
ol.render.webgl.ImageReplay = function(tolerance, maxExtent) {
  ol.render.VectorContext.call(this);

  /**
   * @type {number|undefined}
   * @private
   */
  this.anchorX_ = undefined;

  /**
   * @type {number|undefined}
   * @private
   */
  this.anchorY_ = undefined;

  /**
   * The origin of the coordinate system for the point coordinates sent to
   * the GPU. To eliminate jitter caused by precision problems in the GPU
   * we use the "Rendering Relative to Eye" technique described in the "3D
   * Engine Design for Virtual Globes" book.
   * @private
   * @type {ol.Coordinate}
   */
  this.origin_ = ol.extent.getCenter(maxExtent);

  /**
   * @type {Array.<number>}
   * @private
   */
  this.groupIndices_ = [];

  /**
   * @type {Array.<number>}
   * @private
   */
  this.hitDetectionGroupIndices_ = [];

  /**
   * @type {number|undefined}
   * @private
   */
  this.height_ = undefined;

  /**
   * @type {Array.<HTMLCanvasElement|HTMLImageElement|HTMLVideoElement>}
   * @private
   */
  this.images_ = [];

  /**
   * @type {Array.<HTMLCanvasElement|HTMLImageElement|HTMLVideoElement>}
   * @private
   */
  this.hitDetectionImages_ = [];

  /**
   * @type {number|undefined}
   * @private
   */
  this.imageHeight_ = undefined;

  /**
   * @type {number|undefined}
   * @private
   */
  this.imageWidth_ = undefined;

  /**
   * @type {Array.<number>}
   * @private
   */
  this.indices_ = [];

  /**
   * @type {ol.webgl.Buffer}
   * @private
   */
  this.indicesBuffer_ = null;

  /**
   * @private
   * @type {ol.render.webgl.imagereplay.defaultshader.Locations}
   */
  this.defaultLocations_ = null;

  /**
   * @private
   * @type {number|undefined}
   */
  this.opacity_ = undefined;

  /**
   * @type {ol.Transform}
   * @private
   */
  this.offsetRotateMatrix_ = ol.transform.create();

  /**
   * @type {ol.Transform}
   * @private
   */
  this.offsetScaleMatrix_ = ol.transform.create();

  /**
   * @type {number|undefined}
   * @private
   */
  this.originX_ = undefined;

  /**
   * @type {number|undefined}
   * @private
   */
  this.originY_ = undefined;

  /**
   * @type {ol.Transform}
   * @private
   */
  this.projectionMatrix_ = ol.transform.create();

  /**
   * @type {Array.<number>}
   * @private
   */
  this.tmpMat4_ = ol.vec.Mat4.create();

  /**
   * @private
   * @type {boolean|undefined}
   */
  this.rotateWithView_ = undefined;

  /**
   * @private
   * @type {number|undefined}
   */
  this.rotation_ = undefined;

  /**
   * @private
   * @type {number|undefined}
   */
  this.scale_ = undefined;

  /**
   * @type {Array.<WebGLTexture>}
   * @private
   */
  this.textures_ = [];

  /**
   * @type {Array.<WebGLTexture>}
   * @private
   */
  this.hitDetectionTextures_ = [];

  /**
   * @type {Array.<number>}
   * @private
   */
  this.vertices_ = [];

  /**
   * @type {ol.webgl.Buffer}
   * @private
   */
  this.verticesBuffer_ = null;

  /**
   * Start index per feature (the index).
   * @type {Array.<number>}
   * @private
   */
  this.startIndices_ = [];

  /**
   * Start index per feature (the feature).
   * @type {Array.<ol.Feature|ol.render.Feature>}
   * @private
   */
  this.startIndicesFeature_ = [];

  /**
   * @type {number|undefined}
   * @private
   */
  this.width_ = undefined;
};
ol.inherits(ol.render.webgl.ImageReplay, ol.render.VectorContext);


/**
 * @param {ol.webgl.Context} context WebGL context.
 * @return {function()} Delete resources function.
 */
ol.render.webgl.ImageReplay.prototype.getDeleteResourcesFunction = function(context) {
  // We only delete our stuff here. The shaders and the program may
  // be used by other ImageReplay instances (for other layers). And
  // they will be deleted when disposing of the ol.webgl.Context
  // object.
  goog.DEBUG && console.assert(this.verticesBuffer_,
      'verticesBuffer must not be null');
  goog.DEBUG && console.assert(this.indicesBuffer_,
      'indicesBuffer must not be null');
  var verticesBuffer = this.verticesBuffer_;
  var indicesBuffer = this.indicesBuffer_;
  var textures = this.textures_;
  var hitDetectionTextures = this.hitDetectionTextures_;
  var gl = context.getGL();
  return function() {
    if (!gl.isContextLost()) {
      var i, ii;
      for (i = 0, ii = textures.length; i < ii; ++i) {
        gl.deleteTexture(textures[i]);
      }
      for (i = 0, ii = hitDetectionTextures.length; i < ii; ++i) {
        gl.deleteTexture(hitDetectionTextures[i]);
      }
    }
    context.deleteBuffer(verticesBuffer);
    context.deleteBuffer(indicesBuffer);
  };
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @return {number} My end.
 * @private
 */
ol.render.webgl.ImageReplay.prototype.drawCoordinates_ = function(flatCoordinates, offset, end, stride) {
  goog.DEBUG && console.assert(this.anchorX_ !== undefined, 'anchorX is defined');
  goog.DEBUG && console.assert(this.anchorY_ !== undefined, 'anchorY is defined');
  goog.DEBUG && console.assert(this.height_ !== undefined, 'height is defined');
  goog.DEBUG && console.assert(this.imageHeight_ !== undefined,
      'imageHeight is defined');
  goog.DEBUG && console.assert(this.imageWidth_ !== undefined, 'imageWidth is defined');
  goog.DEBUG && console.assert(this.opacity_ !== undefined, 'opacity is defined');
  goog.DEBUG && console.assert(this.originX_ !== undefined, 'originX is defined');
  goog.DEBUG && console.assert(this.originY_ !== undefined, 'originY is defined');
  goog.DEBUG && console.assert(this.rotateWithView_ !== undefined,
      'rotateWithView is defined');
  goog.DEBUG && console.assert(this.rotation_ !== undefined, 'rotation is defined');
  goog.DEBUG && console.assert(this.scale_ !== undefined, 'scale is defined');
  goog.DEBUG && console.assert(this.width_ !== undefined, 'width is defined');
  var anchorX = /** @type {number} */ (this.anchorX_);
  var anchorY = /** @type {number} */ (this.anchorY_);
  var height = /** @type {number} */ (this.height_);
  var imageHeight = /** @type {number} */ (this.imageHeight_);
  var imageWidth = /** @type {number} */ (this.imageWidth_);
  var opacity = /** @type {number} */ (this.opacity_);
  var originX = /** @type {number} */ (this.originX_);
  var originY = /** @type {number} */ (this.originY_);
  var rotateWithView = this.rotateWithView_ ? 1.0 : 0.0;
  var rotation = /** @type {number} */ (this.rotation_);
  var scale = /** @type {number} */ (this.scale_);
  var width = /** @type {number} */ (this.width_);
  var cos = Math.cos(rotation);
  var sin = Math.sin(rotation);
  var numIndices = this.indices_.length;
  var numVertices = this.vertices_.length;
  var i, n, offsetX, offsetY, x, y;
  for (i = offset; i < end; i += stride) {
    x = flatCoordinates[i] - this.origin_[0];
    y = flatCoordinates[i + 1] - this.origin_[1];

    // There are 4 vertices per [x, y] point, one for each corner of the
    // rectangle we're going to draw. We'd use 1 vertex per [x, y] point if
    // WebGL supported Geometry Shaders (which can emit new vertices), but that
    // is not currently the case.
    //
    // And each vertex includes 8 values: the x and y coordinates, the x and
    // y offsets used to calculate the position of the corner, the u and
    // v texture coordinates for the corner, the opacity, and whether the
    // the image should be rotated with the view (rotateWithView).

    n = numVertices / 8;

    // bottom-left corner
    offsetX = -scale * anchorX;
    offsetY = -scale * (height - anchorY);
    this.vertices_[numVertices++] = x;
    this.vertices_[numVertices++] = y;
    this.vertices_[numVertices++] = offsetX * cos - offsetY * sin;
    this.vertices_[numVertices++] = offsetX * sin + offsetY * cos;
    this.vertices_[numVertices++] = originX / imageWidth;
    this.vertices_[numVertices++] = (originY + height) / imageHeight;
    this.vertices_[numVertices++] = opacity;
    this.vertices_[numVertices++] = rotateWithView;

    // bottom-right corner
    offsetX = scale * (width - anchorX);
    offsetY = -scale * (height - anchorY);
    this.vertices_[numVertices++] = x;
    this.vertices_[numVertices++] = y;
    this.vertices_[numVertices++] = offsetX * cos - offsetY * sin;
    this.vertices_[numVertices++] = offsetX * sin + offsetY * cos;
    this.vertices_[numVertices++] = (originX + width) / imageWidth;
    this.vertices_[numVertices++] = (originY + height) / imageHeight;
    this.vertices_[numVertices++] = opacity;
    this.vertices_[numVertices++] = rotateWithView;

    // top-right corner
    offsetX = scale * (width - anchorX);
    offsetY = scale * anchorY;
    this.vertices_[numVertices++] = x;
    this.vertices_[numVertices++] = y;
    this.vertices_[numVertices++] = offsetX * cos - offsetY * sin;
    this.vertices_[numVertices++] = offsetX * sin + offsetY * cos;
    this.vertices_[numVertices++] = (originX + width) / imageWidth;
    this.vertices_[numVertices++] = originY / imageHeight;
    this.vertices_[numVertices++] = opacity;
    this.vertices_[numVertices++] = rotateWithView;

    // top-left corner
    offsetX = -scale * anchorX;
    offsetY = scale * anchorY;
    this.vertices_[numVertices++] = x;
    this.vertices_[numVertices++] = y;
    this.vertices_[numVertices++] = offsetX * cos - offsetY * sin;
    this.vertices_[numVertices++] = offsetX * sin + offsetY * cos;
    this.vertices_[numVertices++] = originX / imageWidth;
    this.vertices_[numVertices++] = originY / imageHeight;
    this.vertices_[numVertices++] = opacity;
    this.vertices_[numVertices++] = rotateWithView;

    this.indices_[numIndices++] = n;
    this.indices_[numIndices++] = n + 1;
    this.indices_[numIndices++] = n + 2;
    this.indices_[numIndices++] = n;
    this.indices_[numIndices++] = n + 2;
    this.indices_[numIndices++] = n + 3;
  }

  return numVertices;
};


/**
 * @inheritDoc
 */
ol.render.webgl.ImageReplay.prototype.drawMultiPoint = function(multiPointGeometry, feature) {
  this.startIndices_.push(this.indices_.length);
  this.startIndicesFeature_.push(feature);
  var flatCoordinates = multiPointGeometry.getFlatCoordinates();
  var stride = multiPointGeometry.getStride();
  this.drawCoordinates_(
      flatCoordinates, 0, flatCoordinates.length, stride);
};


/**
 * @inheritDoc
 */
ol.render.webgl.ImageReplay.prototype.drawPoint = function(pointGeometry, feature) {
  this.startIndices_.push(this.indices_.length);
  this.startIndicesFeature_.push(feature);
  var flatCoordinates = pointGeometry.getFlatCoordinates();
  var stride = pointGeometry.getStride();
  this.drawCoordinates_(
      flatCoordinates, 0, flatCoordinates.length, stride);
};


/**
 * @param {ol.webgl.Context} context Context.
 */
ol.render.webgl.ImageReplay.prototype.finish = function(context) {
  var gl = context.getGL();

  this.groupIndices_.push(this.indices_.length);
  goog.DEBUG && console.assert(this.images_.length === this.groupIndices_.length,
      'number of images and groupIndices match');
  this.hitDetectionGroupIndices_.push(this.indices_.length);
  goog.DEBUG && console.assert(this.hitDetectionImages_.length ===
      this.hitDetectionGroupIndices_.length,
      'number of hitDetectionImages and hitDetectionGroupIndices match');

  // create, bind, and populate the vertices buffer
  this.verticesBuffer_ = new ol.webgl.Buffer(this.vertices_);
  context.bindBuffer(ol.webgl.ARRAY_BUFFER, this.verticesBuffer_);

  var indices = this.indices_;
  var bits = context.hasOESElementIndexUint ? 32 : 16;
  goog.DEBUG && console.assert(indices[indices.length - 1] < Math.pow(2, bits),
      'Too large element index detected [%s] (OES_element_index_uint "%s")',
      indices[indices.length - 1], context.hasOESElementIndexUint);

  // create, bind, and populate the indices buffer
  this.indicesBuffer_ = new ol.webgl.Buffer(indices);
  context.bindBuffer(ol.webgl.ELEMENT_ARRAY_BUFFER, this.indicesBuffer_);

  // create textures
  /** @type {Object.<string, WebGLTexture>} */
  var texturePerImage = {};

  this.createTextures_(this.textures_, this.images_, texturePerImage, gl);
  goog.DEBUG && console.assert(this.textures_.length === this.groupIndices_.length,
      'number of textures and groupIndices match');

  this.createTextures_(this.hitDetectionTextures_, this.hitDetectionImages_,
      texturePerImage, gl);
  goog.DEBUG && console.assert(this.hitDetectionTextures_.length ===
      this.hitDetectionGroupIndices_.length,
      'number of hitDetectionTextures and hitDetectionGroupIndices match');

  this.anchorX_ = undefined;
  this.anchorY_ = undefined;
  this.height_ = undefined;
  this.images_ = null;
  this.hitDetectionImages_ = null;
  this.imageHeight_ = undefined;
  this.imageWidth_ = undefined;
  this.indices_ = null;
  this.opacity_ = undefined;
  this.originX_ = undefined;
  this.originY_ = undefined;
  this.rotateWithView_ = undefined;
  this.rotation_ = undefined;
  this.scale_ = undefined;
  this.vertices_ = null;
  this.width_ = undefined;
};


/**
 * @private
 * @param {Array.<WebGLTexture>} textures Textures.
 * @param {Array.<HTMLCanvasElement|HTMLImageElement|HTMLVideoElement>} images
 *    Images.
 * @param {Object.<string, WebGLTexture>} texturePerImage Texture cache.
 * @param {WebGLRenderingContext} gl Gl.
 */
ol.render.webgl.ImageReplay.prototype.createTextures_ = function(textures, images, texturePerImage, gl) {
  goog.DEBUG && console.assert(textures.length === 0,
      'upon creation, textures is empty');

  var texture, image, uid, i;
  var ii = images.length;
  for (i = 0; i < ii; ++i) {
    image = images[i];

    uid = ol.getUid(image).toString();
    if (uid in texturePerImage) {
      texture = texturePerImage[uid];
    } else {
      texture = ol.webgl.Context.createTexture(
          gl, image, ol.webgl.CLAMP_TO_EDGE, ol.webgl.CLAMP_TO_EDGE);
      texturePerImage[uid] = texture;
    }
    textures[i] = texture;
  }
};


/**
 * @param {ol.webgl.Context} context Context.
 * @param {ol.Coordinate} center Center.
 * @param {number} resolution Resolution.
 * @param {number} rotation Rotation.
 * @param {ol.Size} size Size.
 * @param {number} pixelRatio Pixel ratio.
 * @param {number} opacity Global opacity.
 * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
 *  to skip.
 * @param {function((ol.Feature|ol.render.Feature)): T|undefined} featureCallback Feature callback.
 * @param {boolean} oneByOne Draw features one-by-one for the hit-detecion.
 * @param {ol.Extent=} opt_hitExtent Hit extent: Only features intersecting
 *  this extent are checked.
 * @return {T|undefined} Callback result.
 * @template T
 */
ol.render.webgl.ImageReplay.prototype.replay = function(context,
    center, resolution, rotation, size, pixelRatio,
    opacity, skippedFeaturesHash,
    featureCallback, oneByOne, opt_hitExtent) {
  var gl = context.getGL();

  // bind the vertices buffer
  goog.DEBUG && console.assert(this.verticesBuffer_,
      'verticesBuffer must not be null');
  context.bindBuffer(ol.webgl.ARRAY_BUFFER, this.verticesBuffer_);

  // bind the indices buffer
  goog.DEBUG && console.assert(this.indicesBuffer_,
      'indecesBuffer must not be null');
  context.bindBuffer(ol.webgl.ELEMENT_ARRAY_BUFFER, this.indicesBuffer_);

  // get the program
  var fragmentShader = ol.render.webgl.imagereplay.defaultshader.fragment;
  var vertexShader = ol.render.webgl.imagereplay.defaultshader.vertex;
  var program = context.getProgram(fragmentShader, vertexShader);

  // get the locations
  var locations;
  if (!this.defaultLocations_) {
    locations =
        new ol.render.webgl.imagereplay.defaultshader.Locations(gl, program);
    this.defaultLocations_ = locations;
  } else {
    locations = this.defaultLocations_;
  }

  // use the program (FIXME: use the return value)
  context.useProgram(program);

  // enable the vertex attrib arrays
  gl.enableVertexAttribArray(locations.a_position);
  gl.vertexAttribPointer(locations.a_position, 2, ol.webgl.FLOAT,
      false, 32, 0);

  gl.enableVertexAttribArray(locations.a_offsets);
  gl.vertexAttribPointer(locations.a_offsets, 2, ol.webgl.FLOAT,
      false, 32, 8);

  gl.enableVertexAttribArray(locations.a_texCoord);
  gl.vertexAttribPointer(locations.a_texCoord, 2, ol.webgl.FLOAT,
      false, 32, 16);

  gl.enableVertexAttribArray(locations.a_opacity);
  gl.vertexAttribPointer(locations.a_opacity, 1, ol.webgl.FLOAT,
      false, 32, 24);

  gl.enableVertexAttribArray(locations.a_rotateWithView);
  gl.vertexAttribPointer(locations.a_rotateWithView, 1, ol.webgl.FLOAT,
      false, 32, 28);

  // set the "uniform" values
  var projectionMatrix = ol.transform.reset(this.projectionMatrix_);
  ol.transform.scale(projectionMatrix, 2 / (resolution * size[0]), 2 / (resolution * size[1]));
  ol.transform.rotate(projectionMatrix, -rotation);
  ol.transform.translate(projectionMatrix, -(center[0] - this.origin_[0]), -(center[1] - this.origin_[1]));

  var offsetScaleMatrix = ol.transform.reset(this.offsetScaleMatrix_);
  ol.transform.scale(offsetScaleMatrix, 2 / size[0], 2 / size[1]);

  var offsetRotateMatrix = ol.transform.reset(this.offsetRotateMatrix_);
  if (rotation !== 0) {
    ol.transform.rotate(offsetRotateMatrix, -rotation);
  }

  gl.uniformMatrix4fv(locations.u_projectionMatrix, false,
      ol.vec.Mat4.fromTransform(this.tmpMat4_, projectionMatrix));
  gl.uniformMatrix4fv(locations.u_offsetScaleMatrix, false,
      ol.vec.Mat4.fromTransform(this.tmpMat4_, offsetScaleMatrix));
  gl.uniformMatrix4fv(locations.u_offsetRotateMatrix, false,
      ol.vec.Mat4.fromTransform(this.tmpMat4_, offsetRotateMatrix));
  gl.uniform1f(locations.u_opacity, opacity);

  // draw!
  var result;
  if (featureCallback === undefined) {
    this.drawReplay_(gl, context, skippedFeaturesHash,
        this.textures_, this.groupIndices_);
  } else {
    // draw feature by feature for the hit-detection
    result = this.drawHitDetectionReplay_(gl, context, skippedFeaturesHash,
        featureCallback, oneByOne, opt_hitExtent);
  }

  // disable the vertex attrib arrays
  gl.disableVertexAttribArray(locations.a_position);
  gl.disableVertexAttribArray(locations.a_offsets);
  gl.disableVertexAttribArray(locations.a_texCoord);
  gl.disableVertexAttribArray(locations.a_opacity);
  gl.disableVertexAttribArray(locations.a_rotateWithView);

  return result;
};


/**
 * @private
 * @param {WebGLRenderingContext} gl gl.
 * @param {ol.webgl.Context} context Context.
 * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
 *  to skip.
 * @param {Array.<WebGLTexture>} textures Textures.
 * @param {Array.<number>} groupIndices Texture group indices.
 */
ol.render.webgl.ImageReplay.prototype.drawReplay_ = function(gl, context, skippedFeaturesHash, textures, groupIndices) {
  goog.DEBUG && console.assert(textures.length === groupIndices.length,
      'number of textures and groupIndeces match');
  var elementType = context.hasOESElementIndexUint ?
      ol.webgl.UNSIGNED_INT : ol.webgl.UNSIGNED_SHORT;
  var elementSize = context.hasOESElementIndexUint ? 4 : 2;

  if (!ol.obj.isEmpty(skippedFeaturesHash)) {
    this.drawReplaySkipping_(
        gl, skippedFeaturesHash, textures, groupIndices,
        elementType, elementSize);
  } else {
    var i, ii, start;
    for (i = 0, ii = textures.length, start = 0; i < ii; ++i) {
      gl.bindTexture(ol.webgl.TEXTURE_2D, textures[i]);
      var end = groupIndices[i];
      this.drawElements_(gl, start, end, elementType, elementSize);
      start = end;
    }
  }
};


/**
 * Draw the replay while paying attention to skipped features.
 *
 * This functions creates groups of features that can be drawn to together,
 * so that the number of `drawElements` calls is minimized.
 *
 * For example given the following texture groups:
 *
 *    Group 1: A B C
 *    Group 2: D [E] F G
 *
 * If feature E should be skipped, the following `drawElements` calls will be
 * made:
 *
 *    drawElements with feature A, B and C
 *    drawElements with feature D
 *    drawElements with feature F and G
 *
 * @private
 * @param {WebGLRenderingContext} gl gl.
 * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
 *  to skip.
 * @param {Array.<WebGLTexture>} textures Textures.
 * @param {Array.<number>} groupIndices Texture group indices.
 * @param {number} elementType Element type.
 * @param {number} elementSize Element Size.
 */
ol.render.webgl.ImageReplay.prototype.drawReplaySkipping_ = function(gl, skippedFeaturesHash, textures, groupIndices,
    elementType, elementSize) {
  var featureIndex = 0;

  var i, ii;
  for (i = 0, ii = textures.length; i < ii; ++i) {
    gl.bindTexture(ol.webgl.TEXTURE_2D, textures[i]);
    var groupStart = (i > 0) ? groupIndices[i - 1] : 0;
    var groupEnd = groupIndices[i];

    var start = groupStart;
    var end = groupStart;
    while (featureIndex < this.startIndices_.length &&
        this.startIndices_[featureIndex] <= groupEnd) {
      var feature = this.startIndicesFeature_[featureIndex];

      var featureUid = ol.getUid(feature).toString();
      if (skippedFeaturesHash[featureUid] !== undefined) {
        // feature should be skipped
        if (start !== end) {
          // draw the features so far
          this.drawElements_(gl, start, end, elementType, elementSize);
        }
        // continue with the next feature
        start = (featureIndex === this.startIndices_.length - 1) ?
            groupEnd : this.startIndices_[featureIndex + 1];
        end = start;
      } else {
        // the feature is not skipped, augment the end index
        end = (featureIndex === this.startIndices_.length - 1) ?
            groupEnd : this.startIndices_[featureIndex + 1];
      }
      featureIndex++;
    }

    if (start !== end) {
      // draw the remaining features (in case there was no skipped feature
      // in this texture group, all features of a group are drawn together)
      this.drawElements_(gl, start, end, elementType, elementSize);
    }
  }
};


/**
 * @private
 * @param {WebGLRenderingContext} gl gl.
 * @param {number} start Start index.
 * @param {number} end End index.
 * @param {number} elementType Element type.
 * @param {number} elementSize Element Size.
 */
ol.render.webgl.ImageReplay.prototype.drawElements_ = function(
    gl, start, end, elementType, elementSize) {
  var numItems = end - start;
  var offsetInBytes = start * elementSize;
  gl.drawElements(ol.webgl.TRIANGLES, numItems, elementType, offsetInBytes);
};


/**
 * @private
 * @param {WebGLRenderingContext} gl gl.
 * @param {ol.webgl.Context} context Context.
 * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
 *  to skip.
 * @param {function((ol.Feature|ol.render.Feature)): T|undefined} featureCallback Feature callback.
 * @param {boolean} oneByOne Draw features one-by-one for the hit-detecion.
 * @param {ol.Extent=} opt_hitExtent Hit extent: Only features intersecting
 *  this extent are checked.
 * @return {T|undefined} Callback result.
 * @template T
 */
ol.render.webgl.ImageReplay.prototype.drawHitDetectionReplay_ = function(gl, context, skippedFeaturesHash, featureCallback, oneByOne,
    opt_hitExtent) {
  if (!oneByOne) {
    // draw all hit-detection features in "once" (by texture group)
    return this.drawHitDetectionReplayAll_(gl, context,
        skippedFeaturesHash, featureCallback);
  } else {
    // draw hit-detection features one by one
    return this.drawHitDetectionReplayOneByOne_(gl, context,
        skippedFeaturesHash, featureCallback, opt_hitExtent);
  }
};


/**
 * @private
 * @param {WebGLRenderingContext} gl gl.
 * @param {ol.webgl.Context} context Context.
 * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
 *  to skip.
 * @param {function((ol.Feature|ol.render.Feature)): T|undefined} featureCallback Feature callback.
 * @return {T|undefined} Callback result.
 * @template T
 */
ol.render.webgl.ImageReplay.prototype.drawHitDetectionReplayAll_ = function(gl, context, skippedFeaturesHash, featureCallback) {
  gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
  this.drawReplay_(gl, context, skippedFeaturesHash,
      this.hitDetectionTextures_, this.hitDetectionGroupIndices_);

  var result = featureCallback(null);
  if (result) {
    return result;
  } else {
    return undefined;
  }
};


/**
 * @private
 * @param {WebGLRenderingContext} gl gl.
 * @param {ol.webgl.Context} context Context.
 * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
 *  to skip.
 * @param {function((ol.Feature|ol.render.Feature)): T|undefined} featureCallback Feature callback.
 * @param {ol.Extent=} opt_hitExtent Hit extent: Only features intersecting
 *  this extent are checked.
 * @return {T|undefined} Callback result.
 * @template T
 */
ol.render.webgl.ImageReplay.prototype.drawHitDetectionReplayOneByOne_ = function(gl, context, skippedFeaturesHash, featureCallback,
    opt_hitExtent) {
  goog.DEBUG && console.assert(this.hitDetectionTextures_.length ===
      this.hitDetectionGroupIndices_.length,
      'number of hitDetectionTextures and hitDetectionGroupIndices match');
  var elementType = context.hasOESElementIndexUint ?
      ol.webgl.UNSIGNED_INT : ol.webgl.UNSIGNED_SHORT;
  var elementSize = context.hasOESElementIndexUint ? 4 : 2;

  var i, groupStart, start, end, feature, featureUid;
  var featureIndex = this.startIndices_.length - 1;
  for (i = this.hitDetectionTextures_.length - 1; i >= 0; --i) {
    gl.bindTexture(ol.webgl.TEXTURE_2D, this.hitDetectionTextures_[i]);
    groupStart = (i > 0) ? this.hitDetectionGroupIndices_[i - 1] : 0;
    end = this.hitDetectionGroupIndices_[i];

    // draw all features for this texture group
    while (featureIndex >= 0 &&
        this.startIndices_[featureIndex] >= groupStart) {
      start = this.startIndices_[featureIndex];
      feature = this.startIndicesFeature_[featureIndex];
      featureUid = ol.getUid(feature).toString();

      if (skippedFeaturesHash[featureUid] === undefined &&
          feature.getGeometry() &&
          (opt_hitExtent === undefined || ol.extent.intersects(
              /** @type {Array<number>} */ (opt_hitExtent),
              feature.getGeometry().getExtent()))) {
        gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
        this.drawElements_(gl, start, end, elementType, elementSize);

        var result = featureCallback(feature);
        if (result) {
          return result;
        }
      }

      end = start;
      featureIndex--;
    }
  }
  return undefined;
};


/**
 * @inheritDoc
 * @abstract
 */
ol.render.webgl.ImageReplay.prototype.setFillStrokeStyle = function() {};


/**
 * @inheritDoc
 */
ol.render.webgl.ImageReplay.prototype.setImageStyle = function(imageStyle) {
  var anchor = imageStyle.getAnchor();
  var image = imageStyle.getImage(1);
  var imageSize = imageStyle.getImageSize();
  var hitDetectionImage = imageStyle.getHitDetectionImage(1);
  var hitDetectionImageSize = imageStyle.getHitDetectionImageSize();
  var opacity = imageStyle.getOpacity();
  var origin = imageStyle.getOrigin();
  var rotateWithView = imageStyle.getRotateWithView();
  var rotation = imageStyle.getRotation();
  var size = imageStyle.getSize();
  var scale = imageStyle.getScale();
  goog.DEBUG && console.assert(anchor, 'imageStyle anchor is not null');
  goog.DEBUG && console.assert(image, 'imageStyle image is not null');
  goog.DEBUG && console.assert(imageSize,
      'imageStyle imageSize is not null');
  goog.DEBUG && console.assert(hitDetectionImage,
      'imageStyle hitDetectionImage is not null');
  goog.DEBUG && console.assert(hitDetectionImageSize,
      'imageStyle hitDetectionImageSize is not null');
  goog.DEBUG && console.assert(opacity !== undefined, 'imageStyle opacity is defined');
  goog.DEBUG && console.assert(origin, 'imageStyle origin is not null');
  goog.DEBUG && console.assert(rotateWithView !== undefined,
      'imageStyle rotateWithView is defined');
  goog.DEBUG && console.assert(rotation !== undefined, 'imageStyle rotation is defined');
  goog.DEBUG && console.assert(size, 'imageStyle size is not null');
  goog.DEBUG && console.assert(scale !== undefined, 'imageStyle scale is defined');

  var currentImage;
  if (this.images_.length === 0) {
    this.images_.push(image);
  } else {
    currentImage = this.images_[this.images_.length - 1];
    if (ol.getUid(currentImage) != ol.getUid(image)) {
      this.groupIndices_.push(this.indices_.length);
      goog.DEBUG && console.assert(this.groupIndices_.length === this.images_.length,
          'number of groupIndices and images match');
      this.images_.push(image);
    }
  }

  if (this.hitDetectionImages_.length === 0) {
    this.hitDetectionImages_.push(hitDetectionImage);
  } else {
    currentImage =
        this.hitDetectionImages_[this.hitDetectionImages_.length - 1];
    if (ol.getUid(currentImage) != ol.getUid(hitDetectionImage)) {
      this.hitDetectionGroupIndices_.push(this.indices_.length);
      goog.DEBUG && console.assert(this.hitDetectionGroupIndices_.length ===
          this.hitDetectionImages_.length,
          'number of hitDetectionGroupIndices and hitDetectionImages match');
      this.hitDetectionImages_.push(hitDetectionImage);
    }
  }

  this.anchorX_ = anchor[0];
  this.anchorY_ = anchor[1];
  this.height_ = size[1];
  this.imageHeight_ = imageSize[1];
  this.imageWidth_ = imageSize[0];
  this.opacity_ = opacity;
  this.originX_ = origin[0];
  this.originY_ = origin[1];
  this.rotation_ = rotation;
  this.rotateWithView_ = rotateWithView;
  this.scale_ = scale;
  this.width_ = size[0];
};


/**
 * @constructor
 * @extends {ol.render.ReplayGroup}
 * @param {number} tolerance Tolerance.
 * @param {ol.Extent} maxExtent Max extent.
 * @param {number=} opt_renderBuffer Render buffer.
 * @struct
 */
ol.render.webgl.ReplayGroup = function(tolerance, maxExtent, opt_renderBuffer) {
  ol.render.ReplayGroup.call(this);

  /**
   * @type {ol.Extent}
   * @private
   */
  this.maxExtent_ = maxExtent;

  /**
   * @type {number}
   * @private
   */
  this.tolerance_ = tolerance;

  /**
   * @type {number|undefined}
   * @private
   */
  this.renderBuffer_ = opt_renderBuffer;

  /**
   * ImageReplay only is supported at this point.
   * @type {Object.<ol.render.ReplayType, ol.render.webgl.ImageReplay>}
   * @private
   */
  this.replays_ = {};

};
ol.inherits(ol.render.webgl.ReplayGroup, ol.render.ReplayGroup);


/**
 * @param {ol.webgl.Context} context WebGL context.
 * @return {function()} Delete resources function.
 */
ol.render.webgl.ReplayGroup.prototype.getDeleteResourcesFunction = function(context) {
  var functions = [];
  var replayKey;
  for (replayKey in this.replays_) {
    functions.push(
        this.replays_[replayKey].getDeleteResourcesFunction(context));
  }
  return function() {
    var length = functions.length;
    var result;
    for (var i = 0; i < length; i++) {
      result = functions[i].apply(this, arguments);
    }
    return result;
  };
};


/**
 * @param {ol.webgl.Context} context Context.
 */
ol.render.webgl.ReplayGroup.prototype.finish = function(context) {
  var replayKey;
  for (replayKey in this.replays_) {
    this.replays_[replayKey].finish(context);
  }
};


/**
 * @inheritDoc
 */
ol.render.webgl.ReplayGroup.prototype.getReplay = function(zIndex, replayType) {
  var replay = this.replays_[replayType];
  if (replay === undefined) {
    var constructor = ol.render.webgl.BATCH_CONSTRUCTORS_[replayType];
    replay = new constructor(this.tolerance_, this.maxExtent_);
    this.replays_[replayType] = replay;
  }
  return replay;
};


/**
 * @inheritDoc
 */
ol.render.webgl.ReplayGroup.prototype.isEmpty = function() {
  return ol.obj.isEmpty(this.replays_);
};


/**
 * @param {ol.webgl.Context} context Context.
 * @param {ol.Coordinate} center Center.
 * @param {number} resolution Resolution.
 * @param {number} rotation Rotation.
 * @param {ol.Size} size Size.
 * @param {number} pixelRatio Pixel ratio.
 * @param {number} opacity Global opacity.
 * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
 *  to skip.
 */
ol.render.webgl.ReplayGroup.prototype.replay = function(context,
    center, resolution, rotation, size, pixelRatio,
    opacity, skippedFeaturesHash) {
  var i, ii, replay;
  for (i = 0, ii = ol.render.replay.ORDER.length; i < ii; ++i) {
    replay = this.replays_[ol.render.replay.ORDER[i]];
    if (replay !== undefined) {
      replay.replay(context,
          center, resolution, rotation, size, pixelRatio,
          opacity, skippedFeaturesHash,
          undefined, false);
    }
  }
};


/**
 * @private
 * @param {ol.webgl.Context} context Context.
 * @param {ol.Coordinate} center Center.
 * @param {number} resolution Resolution.
 * @param {number} rotation Rotation.
 * @param {ol.Size} size Size.
 * @param {number} pixelRatio Pixel ratio.
 * @param {number} opacity Global opacity.
 * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
 *  to skip.
 * @param {function((ol.Feature|ol.render.Feature)): T|undefined} featureCallback Feature callback.
 * @param {boolean} oneByOne Draw features one-by-one for the hit-detecion.
 * @param {ol.Extent=} opt_hitExtent Hit extent: Only features intersecting
 *  this extent are checked.
 * @return {T|undefined} Callback result.
 * @template T
 */
ol.render.webgl.ReplayGroup.prototype.replayHitDetection_ = function(context,
    center, resolution, rotation, size, pixelRatio, opacity,
    skippedFeaturesHash, featureCallback, oneByOne, opt_hitExtent) {
  var i, replay, result;
  for (i = ol.render.replay.ORDER.length - 1; i >= 0; --i) {
    replay = this.replays_[ol.render.replay.ORDER[i]];
    if (replay !== undefined) {
      result = replay.replay(context,
          center, resolution, rotation, size, pixelRatio, opacity,
          skippedFeaturesHash, featureCallback, oneByOne, opt_hitExtent);
      if (result) {
        return result;
      }
    }
  }
  return undefined;
};


/**
 * @param {ol.Coordinate} coordinate Coordinate.
 * @param {ol.webgl.Context} context Context.
 * @param {ol.Coordinate} center Center.
 * @param {number} resolution Resolution.
 * @param {number} rotation Rotation.
 * @param {ol.Size} size Size.
 * @param {number} pixelRatio Pixel ratio.
 * @param {number} opacity Global opacity.
 * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
 *  to skip.
 * @param {function((ol.Feature|ol.render.Feature)): T|undefined} callback Feature callback.
 * @return {T|undefined} Callback result.
 * @template T
 */
ol.render.webgl.ReplayGroup.prototype.forEachFeatureAtCoordinate = function(
    coordinate, context, center, resolution, rotation, size, pixelRatio,
    opacity, skippedFeaturesHash,
    callback) {
  var gl = context.getGL();
  gl.bindFramebuffer(
      gl.FRAMEBUFFER, context.getHitDetectionFramebuffer());


  /**
   * @type {ol.Extent}
   */
  var hitExtent;
  if (this.renderBuffer_ !== undefined) {
    // build an extent around the coordinate, so that only features that
    // intersect this extent are checked
    hitExtent = ol.extent.buffer(
        ol.extent.createOrUpdateFromCoordinate(coordinate),
        resolution * this.renderBuffer_);
  }

  return this.replayHitDetection_(context,
      coordinate, resolution, rotation, ol.render.webgl.HIT_DETECTION_SIZE_,
      pixelRatio, opacity, skippedFeaturesHash,
      /**
       * @param {ol.Feature|ol.render.Feature} feature Feature.
       * @return {?} Callback result.
       */
      function(feature) {
        var imageData = new Uint8Array(4);
        gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, imageData);

        if (imageData[3] > 0) {
          var result = callback(feature);
          if (result) {
            return result;
          }
        }
      }, true, hitExtent);
};


/**
 * @param {ol.Coordinate} coordinate Coordinate.
 * @param {ol.webgl.Context} context Context.
 * @param {ol.Coordinate} center Center.
 * @param {number} resolution Resolution.
 * @param {number} rotation Rotation.
 * @param {ol.Size} size Size.
 * @param {number} pixelRatio Pixel ratio.
 * @param {number} opacity Global opacity.
 * @param {Object.<string, boolean>} skippedFeaturesHash Ids of features
 *  to skip.
 * @return {boolean} Is there a feature at the given coordinate?
 */
ol.render.webgl.ReplayGroup.prototype.hasFeatureAtCoordinate = function(
    coordinate, context, center, resolution, rotation, size, pixelRatio,
    opacity, skippedFeaturesHash) {
  var gl = context.getGL();
  gl.bindFramebuffer(
      gl.FRAMEBUFFER, context.getHitDetectionFramebuffer());

  var hasFeature = this.replayHitDetection_(context,
      coordinate, resolution, rotation, ol.render.webgl.HIT_DETECTION_SIZE_,
      pixelRatio, opacity, skippedFeaturesHash,
      /**
       * @param {ol.Feature|ol.render.Feature} feature Feature.
       * @return {boolean} Is there a feature?
       */
      function(feature) {
        var imageData = new Uint8Array(4);
        gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, imageData);
        return imageData[3] > 0;
      }, false);

  return hasFeature !== undefined;
};


/**
 * @const
 * @private
 * @type {Object.<ol.render.ReplayType,
 *                function(new: ol.render.webgl.ImageReplay, number,
 *                ol.Extent)>}
 */
ol.render.webgl.BATCH_CONSTRUCTORS_ = {
  'Image': ol.render.webgl.ImageReplay
};


/**
 * @const
 * @private
 * @type {Array.<number>}
 */
ol.render.webgl.HIT_DETECTION_SIZE_ = [1, 1];

goog.provide('ol.render.webgl.Immediate');

goog.require('ol');
goog.require('ol.extent');
goog.require('ol.geom.GeometryType');
goog.require('ol.render.ReplayType');
goog.require('ol.render.VectorContext');
goog.require('ol.render.webgl.ReplayGroup');


/**
 * @constructor
 * @extends {ol.render.VectorContext}
 * @param {ol.webgl.Context} context Context.
 * @param {ol.Coordinate} center Center.
 * @param {number} resolution Resolution.
 * @param {number} rotation Rotation.
 * @param {ol.Size} size Size.
 * @param {ol.Extent} extent Extent.
 * @param {number} pixelRatio Pixel ratio.
 * @struct
 */
ol.render.webgl.Immediate = function(context, center, resolution, rotation, size, extent, pixelRatio) {
  ol.render.VectorContext.call(this);

  /**
   * @private
   */
  this.context_ = context;

  /**
   * @private
   */
  this.center_ = center;

  /**
   * @private
   */
  this.extent_ = extent;

  /**
   * @private
   */
  this.pixelRatio_ = pixelRatio;

  /**
   * @private
   */
  this.size_ = size;

  /**
   * @private
   */
  this.rotation_ = rotation;

  /**
   * @private
   */
  this.resolution_ = resolution;

  /**
   * @private
   * @type {ol.style.Image}
   */
  this.imageStyle_ = null;

};
ol.inherits(ol.render.webgl.Immediate, ol.render.VectorContext);


/**
 * Set the rendering style.  Note that since this is an immediate rendering API,
 * any `zIndex` on the provided style will be ignored.
 *
 * @param {ol.style.Style} style The rendering style.
 * @api
 */
ol.render.webgl.Immediate.prototype.setStyle = function(style) {
  this.setImageStyle(style.getImage());
};


/**
 * Render a geometry into the canvas.  Call
 * {@link ol.render.webgl.Immediate#setStyle} first to set the rendering style.
 *
 * @param {ol.geom.Geometry|ol.render.Feature} geometry The geometry to render.
 * @api
 */
ol.render.webgl.Immediate.prototype.drawGeometry = function(geometry) {
  var type = geometry.getType();
  switch (type) {
    case ol.geom.GeometryType.POINT:
      this.drawPoint(/** @type {ol.geom.Point} */ (geometry), null);
      break;
    case ol.geom.GeometryType.MULTI_POINT:
      this.drawMultiPoint(/** @type {ol.geom.MultiPoint} */ (geometry), null);
      break;
    case ol.geom.GeometryType.GEOMETRY_COLLECTION:
      this.drawGeometryCollection(/** @type {ol.geom.GeometryCollection} */ (geometry), null);
      break;
    default:
      goog.DEBUG && console.assert(false, 'Unsupported geometry type: ' + type);
  }
};


/**
 * @inheritDoc
 * @api
 */
ol.render.webgl.Immediate.prototype.drawFeature = function(feature, style) {
  var geometry = style.getGeometryFunction()(feature);
  if (!geometry ||
      !ol.extent.intersects(this.extent_, geometry.getExtent())) {
    return;
  }
  this.setStyle(style);
  goog.DEBUG && console.assert(geometry, 'geometry must be truthy');
  this.drawGeometry(geometry);
};


/**
 * @inheritDoc
 */
ol.render.webgl.Immediate.prototype.drawGeometryCollection = function(geometry, data) {
  var geometries = geometry.getGeometriesArray();
  var i, ii;
  for (i = 0, ii = geometries.length; i < ii; ++i) {
    this.drawGeometry(geometries[i]);
  }
};


/**
 * @inheritDoc
 */
ol.render.webgl.Immediate.prototype.drawPoint = function(geometry, data) {
  var context = this.context_;
  var replayGroup = new ol.render.webgl.ReplayGroup(1, this.extent_);
  var replay = /** @type {ol.render.webgl.ImageReplay} */ (
      replayGroup.getReplay(0, ol.render.ReplayType.IMAGE));
  replay.setImageStyle(this.imageStyle_);
  replay.drawPoint(geometry, data);
  replay.finish(context);
  // default colors
  var opacity = 1;
  var skippedFeatures = {};
  var featureCallback;
  var oneByOne = false;
  replay.replay(this.context_, this.center_, this.resolution_, this.rotation_,
      this.size_, this.pixelRatio_, opacity, skippedFeatures, featureCallback,
      oneByOne);
  replay.getDeleteResourcesFunction(context)();
};


/**
 * @inheritDoc
 */
ol.render.webgl.Immediate.prototype.drawMultiPoint = function(geometry, data) {
  var context = this.context_;
  var replayGroup = new ol.render.webgl.ReplayGroup(1, this.extent_);
  var replay = /** @type {ol.render.webgl.ImageReplay} */ (
      replayGroup.getReplay(0, ol.render.ReplayType.IMAGE));
  replay.setImageStyle(this.imageStyle_);
  replay.drawMultiPoint(geometry, data);
  replay.finish(context);
  var opacity = 1;
  var skippedFeatures = {};
  var featureCallback;
  var oneByOne = false;
  replay.replay(this.context_, this.center_, this.resolution_, this.rotation_,
      this.size_, this.pixelRatio_, opacity, skippedFeatures, featureCallback,
      oneByOne);
  replay.getDeleteResourcesFunction(context)();
};


/**
 * @inheritDoc
 */
ol.render.webgl.Immediate.prototype.setImageStyle = function(imageStyle) {
  this.imageStyle_ = imageStyle;
};

// This file is automatically generated, do not edit
goog.provide('ol.renderer.webgl.defaultmapshader');

goog.require('ol');
goog.require('ol.webgl.Fragment');
goog.require('ol.webgl.Vertex');


/**
 * @constructor
 * @extends {ol.webgl.Fragment}
 * @struct
 */
ol.renderer.webgl.defaultmapshader.Fragment = function() {
  ol.webgl.Fragment.call(this, ol.renderer.webgl.defaultmapshader.Fragment.SOURCE);
};
ol.inherits(ol.renderer.webgl.defaultmapshader.Fragment, ol.webgl.Fragment);


/**
 * @const
 * @type {string}
 */
ol.renderer.webgl.defaultmapshader.Fragment.DEBUG_SOURCE = 'precision mediump float;\nvarying vec2 v_texCoord;\n\n\nuniform float u_opacity;\nuniform sampler2D u_texture;\n\nvoid main(void) {\n  vec4 texColor = texture2D(u_texture, v_texCoord);\n  gl_FragColor.rgb = texColor.rgb;\n  gl_FragColor.a = texColor.a * u_opacity;\n}\n';


/**
 * @const
 * @type {string}
 */
ol.renderer.webgl.defaultmapshader.Fragment.OPTIMIZED_SOURCE = 'precision mediump float;varying vec2 a;uniform float f;uniform sampler2D g;void main(void){vec4 texColor=texture2D(g,a);gl_FragColor.rgb=texColor.rgb;gl_FragColor.a=texColor.a*f;}';


/**
 * @const
 * @type {string}
 */
ol.renderer.webgl.defaultmapshader.Fragment.SOURCE = goog.DEBUG ?
    ol.renderer.webgl.defaultmapshader.Fragment.DEBUG_SOURCE :
    ol.renderer.webgl.defaultmapshader.Fragment.OPTIMIZED_SOURCE;


ol.renderer.webgl.defaultmapshader.fragment = new ol.renderer.webgl.defaultmapshader.Fragment();


/**
 * @constructor
 * @extends {ol.webgl.Vertex}
 * @struct
 */
ol.renderer.webgl.defaultmapshader.Vertex = function() {
  ol.webgl.Vertex.call(this, ol.renderer.webgl.defaultmapshader.Vertex.SOURCE);
};
ol.inherits(ol.renderer.webgl.defaultmapshader.Vertex, ol.webgl.Vertex);


/**
 * @const
 * @type {string}
 */
ol.renderer.webgl.defaultmapshader.Vertex.DEBUG_SOURCE = 'varying vec2 v_texCoord;\n\n\nattribute vec2 a_position;\nattribute vec2 a_texCoord;\n\nuniform mat4 u_texCoordMatrix;\nuniform mat4 u_projectionMatrix;\n\nvoid main(void) {\n  gl_Position = u_projectionMatrix * vec4(a_position, 0., 1.);\n  v_texCoord = (u_texCoordMatrix * vec4(a_texCoord, 0., 1.)).st;\n}\n\n\n';


/**
 * @const
 * @type {string}
 */
ol.renderer.webgl.defaultmapshader.Vertex.OPTIMIZED_SOURCE = 'varying vec2 a;attribute vec2 b;attribute vec2 c;uniform mat4 d;uniform mat4 e;void main(void){gl_Position=e*vec4(b,0.,1.);a=(d*vec4(c,0.,1.)).st;}';


/**
 * @const
 * @type {string}
 */
ol.renderer.webgl.defaultmapshader.Vertex.SOURCE = goog.DEBUG ?
    ol.renderer.webgl.defaultmapshader.Vertex.DEBUG_SOURCE :
    ol.renderer.webgl.defaultmapshader.Vertex.OPTIMIZED_SOURCE;


ol.renderer.webgl.defaultmapshader.vertex = new ol.renderer.webgl.defaultmapshader.Vertex();


/**
 * @constructor
 * @param {WebGLRenderingContext} gl GL.
 * @param {WebGLProgram} program Program.
 * @struct
 */
ol.renderer.webgl.defaultmapshader.Locations = function(gl, program) {

  /**
   * @type {WebGLUniformLocation}
   */
  this.u_opacity = gl.getUniformLocation(
      program, goog.DEBUG ? 'u_opacity' : 'f');

  /**
   * @type {WebGLUniformLocation}
   */
  this.u_projectionMatrix = gl.getUniformLocation(
      program, goog.DEBUG ? 'u_projectionMatrix' : 'e');

  /**
   * @type {WebGLUniformLocation}
   */
  this.u_texCoordMatrix = gl.getUniformLocation(
      program, goog.DEBUG ? 'u_texCoordMatrix' : 'd');

  /**
   * @type {WebGLUniformLocation}
   */
  this.u_texture = gl.getUniformLocation(
      program, goog.DEBUG ? 'u_texture' : 'g');

  /**
   * @type {number}
   */
  this.a_position = gl.getAttribLocation(
      program, goog.DEBUG ? 'a_position' : 'b');

  /**
   * @type {number}
   */
  this.a_texCoord = gl.getAttribLocation(
      program, goog.DEBUG ? 'a_texCoord' : 'c');
};

goog.provide('ol.renderer.webgl.Layer');

goog.require('ol');
goog.require('ol.render.Event');
goog.require('ol.render.EventType');
goog.require('ol.render.webgl.Immediate');
goog.require('ol.renderer.Layer');
goog.require('ol.renderer.webgl.defaultmapshader');
goog.require('ol.transform');
goog.require('ol.vec.Mat4');
goog.require('ol.webgl');
goog.require('ol.webgl.Buffer');
goog.require('ol.webgl.Context');


/**
 * @constructor
 * @extends {ol.renderer.Layer}
 * @param {ol.renderer.webgl.Map} mapRenderer Map renderer.
 * @param {ol.layer.Layer} layer Layer.
 */
ol.renderer.webgl.Layer = function(mapRenderer, layer) {

  ol.renderer.Layer.call(this, layer);

  /**
   * @protected
   * @type {ol.renderer.webgl.Map}
   */
  this.mapRenderer = mapRenderer;

  /**
   * @private
   * @type {ol.webgl.Buffer}
   */
  this.arrayBuffer_ = new ol.webgl.Buffer([
    -1, -1, 0, 0,
    1, -1, 1, 0,
    -1, 1, 0, 1,
    1, 1, 1, 1
  ]);

  /**
   * @protected
   * @type {WebGLTexture}
   */
  this.texture = null;

  /**
   * @protected
   * @type {WebGLFramebuffer}
   */
  this.framebuffer = null;

  /**
   * @protected
   * @type {number|undefined}
   */
  this.framebufferDimension = undefined;

  /**
   * @protected
   * @type {ol.Transform}
   */
  this.texCoordMatrix = ol.transform.create();

  /**
   * @protected
   * @type {ol.Transform}
   */
  this.projectionMatrix = ol.transform.create();

  /**
   * @type {Array.<number>}
   * @private
   */
  this.tmpMat4_ = ol.vec.Mat4.create();

  /**
   * @private
   * @type {ol.renderer.webgl.defaultmapshader.Locations}
   */
  this.defaultLocations_ = null;

};
ol.inherits(ol.renderer.webgl.Layer, ol.renderer.Layer);


/**
 * @param {olx.FrameState} frameState Frame state.
 * @param {number} framebufferDimension Framebuffer dimension.
 * @protected
 */
ol.renderer.webgl.Layer.prototype.bindFramebuffer = function(frameState, framebufferDimension) {

  var gl = this.mapRenderer.getGL();

  if (this.framebufferDimension === undefined ||
      this.framebufferDimension != framebufferDimension) {
    /**
     * @param {WebGLRenderingContext} gl GL.
     * @param {WebGLFramebuffer} framebuffer Framebuffer.
     * @param {WebGLTexture} texture Texture.
     */
    var postRenderFunction = function(gl, framebuffer, texture) {
      if (!gl.isContextLost()) {
        gl.deleteFramebuffer(framebuffer);
        gl.deleteTexture(texture);
      }
    }.bind(null, gl, this.framebuffer, this.texture);

    frameState.postRenderFunctions.push(
      /** @type {ol.PostRenderFunction} */ (postRenderFunction)
    );

    var texture = ol.webgl.Context.createEmptyTexture(
        gl, framebufferDimension, framebufferDimension);

    var framebuffer = gl.createFramebuffer();
    gl.bindFramebuffer(ol.webgl.FRAMEBUFFER, framebuffer);
    gl.framebufferTexture2D(ol.webgl.FRAMEBUFFER,
        ol.webgl.COLOR_ATTACHMENT0, ol.webgl.TEXTURE_2D, texture, 0);

    this.texture = texture;
    this.framebuffer = framebuffer;
    this.framebufferDimension = framebufferDimension;

  } else {
    gl.bindFramebuffer(ol.webgl.FRAMEBUFFER, this.framebuffer);
  }

};


/**
 * @param {olx.FrameState} frameState Frame state.
 * @param {ol.LayerState} layerState Layer state.
 * @param {ol.webgl.Context} context Context.
 */
ol.renderer.webgl.Layer.prototype.composeFrame = function(frameState, layerState, context) {

  this.dispatchComposeEvent_(
      ol.render.EventType.PRECOMPOSE, context, frameState);

  context.bindBuffer(ol.webgl.ARRAY_BUFFER, this.arrayBuffer_);

  var gl = context.getGL();

  var fragmentShader = ol.renderer.webgl.defaultmapshader.fragment;
  var vertexShader = ol.renderer.webgl.defaultmapshader.vertex;

  var program = context.getProgram(fragmentShader, vertexShader);

  var locations;
  if (!this.defaultLocations_) {
    locations =
        new ol.renderer.webgl.defaultmapshader.Locations(gl, program);
    this.defaultLocations_ = locations;
  } else {
    locations = this.defaultLocations_;
  }

  if (context.useProgram(program)) {
    gl.enableVertexAttribArray(locations.a_position);
    gl.vertexAttribPointer(
        locations.a_position, 2, ol.webgl.FLOAT, false, 16, 0);
    gl.enableVertexAttribArray(locations.a_texCoord);
    gl.vertexAttribPointer(
        locations.a_texCoord, 2, ol.webgl.FLOAT, false, 16, 8);
    gl.uniform1i(locations.u_texture, 0);
  }

  gl.uniformMatrix4fv(locations.u_texCoordMatrix, false,
      ol.vec.Mat4.fromTransform(this.tmpMat4_, this.getTexCoordMatrix()));
  gl.uniformMatrix4fv(locations.u_projectionMatrix, false,
      ol.vec.Mat4.fromTransform(this.tmpMat4_, this.getProjectionMatrix()));
  gl.uniform1f(locations.u_opacity, layerState.opacity);
  gl.bindTexture(ol.webgl.TEXTURE_2D, this.getTexture());
  gl.drawArrays(ol.webgl.TRIANGLE_STRIP, 0, 4);

  this.dispatchComposeEvent_(
      ol.render.EventType.POSTCOMPOSE, context, frameState);

};


/**
 * @param {ol.render.EventType} type Event type.
 * @param {ol.webgl.Context} context WebGL context.
 * @param {olx.FrameState} frameState Frame state.
 * @private
 */
ol.renderer.webgl.Layer.prototype.dispatchComposeEvent_ = function(type, context, frameState) {
  var layer = this.getLayer();
  if (layer.hasListener(type)) {
    var viewState = frameState.viewState;
    var resolution = viewState.resolution;
    var pixelRatio = frameState.pixelRatio;
    var extent = frameState.extent;
    var center = viewState.center;
    var rotation = viewState.rotation;
    var size = frameState.size;

    var render = new ol.render.webgl.Immediate(
        context, center, resolution, rotation, size, extent, pixelRatio);
    var composeEvent = new ol.render.Event(
        type, render, frameState, null, context);
    layer.dispatchEvent(composeEvent);
  }
};


/**
 * @return {!ol.Transform} Matrix.
 */
ol.renderer.webgl.Layer.prototype.getTexCoordMatrix = function() {
  return this.texCoordMatrix;
};


/**
 * @return {WebGLTexture} Texture.
 */
ol.renderer.webgl.Layer.prototype.getTexture = function() {
  return this.texture;
};


/**
 * @return {!ol.Transform} Matrix.
 */
ol.renderer.webgl.Layer.prototype.getProjectionMatrix = function() {
  return this.projectionMatrix;
};


/**
 * Handle webglcontextlost.
 */
ol.renderer.webgl.Layer.prototype.handleWebGLContextLost = function() {
  this.texture = null;
  this.framebuffer = null;
  this.framebufferDimension = undefined;
};


/**
 * @abstract
 * @param {olx.FrameState} frameState Frame state.
 * @param {ol.LayerState} layerState Layer state.
 * @param {ol.webgl.Context} context Context.
 * @return {boolean} whether composeFrame should be called.
 */
ol.renderer.webgl.Layer.prototype.prepareFrame = function(frameState, layerState, context) {};

goog.provide('ol.renderer.webgl.ImageLayer');

goog.require('ol');
goog.require('ol.View');
goog.require('ol.dom');
goog.require('ol.extent');
goog.require('ol.functions');
goog.require('ol.proj');
goog.require('ol.renderer.webgl.Layer');
goog.require('ol.source.ImageVector');
goog.require('ol.transform');
goog.require('ol.webgl');
goog.require('ol.webgl.Context');


/**
 * @constructor
 * @extends {ol.renderer.webgl.Layer}
 * @param {ol.renderer.webgl.Map} mapRenderer Map renderer.
 * @param {ol.layer.Image} imageLayer Tile layer.
 */
ol.renderer.webgl.ImageLayer = function(mapRenderer, imageLayer) {

  ol.renderer.webgl.Layer.call(this, mapRenderer, imageLayer);

  /**
   * The last rendered image.
   * @private
   * @type {?ol.ImageBase}
   */
  this.image_ = null;

  /**
   * @private
   * @type {CanvasRenderingContext2D}
   */
  this.hitCanvasContext_ = null;

  /**
   * @private
   * @type {?ol.Transform}
   */
  this.hitTransformationMatrix_ = null;

};
ol.inherits(ol.renderer.webgl.ImageLayer, ol.renderer.webgl.Layer);


/**
 * @param {ol.ImageBase} image Image.
 * @private
 * @return {WebGLTexture} Texture.
 */
ol.renderer.webgl.ImageLayer.prototype.createTexture_ = function(image) {

  // We meet the conditions to work with non-power of two textures.
  // http://www.khronos.org/webgl/wiki/WebGL_and_OpenGL_Differences#Non-Power_of_Two_Texture_Support
  // http://learningwebgl.com/blog/?p=2101

  var imageElement = image.getImage();
  var gl = this.mapRenderer.getGL();

  return ol.webgl.Context.createTexture(
      gl, imageElement, ol.webgl.CLAMP_TO_EDGE, ol.webgl.CLAMP_TO_EDGE);
};


/**
 * @inheritDoc
 */
ol.renderer.webgl.ImageLayer.prototype.forEachFeatureAtCoordinate = function(coordinate, frameState, callback, thisArg) {
  var layer = this.getLayer();
  var source = layer.getSource();
  var resolution = frameState.viewState.resolution;
  var rotation = frameState.viewState.rotation;
  var skippedFeatureUids = frameState.skippedFeatureUids;
  return source.forEachFeatureAtCoordinate(
      coordinate, resolution, rotation, skippedFeatureUids,

      /**
       * @param {ol.Feature|ol.render.Feature} feature Feature.
       * @return {?} Callback result.
       */
      function(feature) {
        return callback.call(thisArg, feature, layer);
      });
};


/**
 * @inheritDoc
 */
ol.renderer.webgl.ImageLayer.prototype.prepareFrame = function(frameState, layerState, context) {

  var gl = this.mapRenderer.getGL();

  var pixelRatio = frameState.pixelRatio;
  var viewState = frameState.viewState;
  var viewCenter = viewState.center;
  var viewResolution = viewState.resolution;
  var viewRotation = viewState.rotation;

  var image = this.image_;
  var texture = this.texture;
  var imageLayer = /** @type {ol.layer.Image} */ (this.getLayer());
  var imageSource = imageLayer.getSource();

  var hints = frameState.viewHints;

  var renderedExtent = frameState.extent;
  if (layerState.extent !== undefined) {
    renderedExtent = ol.extent.getIntersection(
        renderedExtent, layerState.extent);
  }
  if (!hints[ol.View.Hint.ANIMATING] && !hints[ol.View.Hint.INTERACTING] &&
      !ol.extent.isEmpty(renderedExtent)) {
    var projection = viewState.projection;
    if (!ol.ENABLE_RASTER_REPROJECTION) {
      var sourceProjection = imageSource.getProjection();
      if (sourceProjection) {
        goog.DEBUG && console.assert(ol.proj.equivalent(projection, sourceProjection),
            'projection and sourceProjection are equivalent');
        projection = sourceProjection;
      }
    }
    var image_ = imageSource.getImage(renderedExtent, viewResolution,
        pixelRatio, projection);
    if (image_) {
      var loaded = this.loadImage(image_);
      if (loaded) {
        image = image_;
        texture = this.createTexture_(image_);
        if (this.texture) {
          /**
           * @param {WebGLRenderingContext} gl GL.
           * @param {WebGLTexture} texture Texture.
           */
          var postRenderFunction = function(gl, texture) {
            if (!gl.isContextLost()) {
              gl.deleteTexture(texture);
            }
          }.bind(null, gl, this.texture);
          frameState.postRenderFunctions.push(
            /** @type {ol.PostRenderFunction} */ (postRenderFunction)
          );
        }
      }
    }
  }

  if (image) {
    goog.DEBUG && console.assert(texture, 'texture is truthy');

    var canvas = this.mapRenderer.getContext().getCanvas();

    this.updateProjectionMatrix_(canvas.width, canvas.height,
        pixelRatio, viewCenter, viewResolution, viewRotation,
        image.getExtent());
    this.hitTransformationMatrix_ = null;

    // Translate and scale to flip the Y coord.
    var texCoordMatrix = this.texCoordMatrix;
    ol.transform.reset(texCoordMatrix);
    ol.transform.scale(texCoordMatrix, 1, -1);
    ol.transform.translate(texCoordMatrix, 0, -1);

    this.image_ = image;
    this.texture = texture;

    this.updateAttributions(frameState.attributions, image.getAttributions());
    this.updateLogos(frameState, imageSource);
  }

  return true;
};


/**
 * @param {number} canvasWidth Canvas width.
 * @param {number} canvasHeight Canvas height.
 * @param {number} pixelRatio Pixel ratio.
 * @param {ol.Coordinate} viewCenter View center.
 * @param {number} viewResolution View resolution.
 * @param {number} viewRotation View rotation.
 * @param {ol.Extent} imageExtent Image extent.
 * @private
 */
ol.renderer.webgl.ImageLayer.prototype.updateProjectionMatrix_ = function(canvasWidth, canvasHeight, pixelRatio,
        viewCenter, viewResolution, viewRotation, imageExtent) {

  var canvasExtentWidth = canvasWidth * viewResolution;
  var canvasExtentHeight = canvasHeight * viewResolution;

  var projectionMatrix = this.projectionMatrix;
  ol.transform.reset(projectionMatrix);
  ol.transform.scale(projectionMatrix,
      pixelRatio * 2 / canvasExtentWidth,
      pixelRatio * 2 / canvasExtentHeight);
  ol.transform.rotate(projectionMatrix, -viewRotation);
  ol.transform.translate(projectionMatrix,
      imageExtent[0] - viewCenter[0],
      imageExtent[1] - viewCenter[1]);
  ol.transform.scale(projectionMatrix,
      (imageExtent[2] - imageExtent[0]) / 2,
      (imageExtent[3] - imageExtent[1]) / 2);
  ol.transform.translate(projectionMatrix, 1, 1);

};


/**
 * @inheritDoc
 */
ol.renderer.webgl.ImageLayer.prototype.hasFeatureAtCoordinate = function(coordinate, frameState) {
  var hasFeature = this.forEachFeatureAtCoordinate(
      coordinate, frameState, ol.functions.TRUE, this);
  return hasFeature !== undefined;
};


/**
 * @param {ol.Pixel} pixel Pixel.
 * @param {olx.FrameState} frameState FrameState.
 * @param {function(this: S, ol.layer.Layer, ol.Color): T} callback Layer
 *     callback.
 * @param {S} thisArg Value to use as `this` when executing `callback`.
 * @return {T|undefined} Callback result.
 * @template S,T,U
 */
ol.renderer.webgl.ImageLayer.prototype.forEachLayerAtPixel = function(pixel, frameState, callback, thisArg) {
  if (!this.image_ || !this.image_.getImage()) {
    return undefined;
  }

  if (this.getLayer().getSource() instanceof ol.source.ImageVector) {
    // for ImageVector sources use the original hit-detection logic,
    // so that for example also transparent polygons are detected
    var coordinate = ol.transform.apply(
        frameState.pixelToCoordinateTransform, pixel.slice());
    var hasFeature = this.forEachFeatureAtCoordinate(
        coordinate, frameState, ol.functions.TRUE, this);

    if (hasFeature) {
      return callback.call(thisArg, this.getLayer(), null);
    } else {
      return undefined;
    }
  } else {
    var imageSize =
        [this.image_.getImage().width, this.image_.getImage().height];

    if (!this.hitTransformationMatrix_) {
      this.hitTransformationMatrix_ = this.getHitTransformationMatrix_(
          frameState.size, imageSize);
    }

    var pixelOnFrameBuffer = ol.transform.apply(
        this.hitTransformationMatrix_, pixel.slice());

    if (pixelOnFrameBuffer[0] < 0 || pixelOnFrameBuffer[0] > imageSize[0] ||
        pixelOnFrameBuffer[1] < 0 || pixelOnFrameBuffer[1] > imageSize[1]) {
      // outside the image, no need to check
      return undefined;
    }

    if (!this.hitCanvasContext_) {
      this.hitCanvasContext_ = ol.dom.createCanvasContext2D(1, 1);
    }

    this.hitCanvasContext_.clearRect(0, 0, 1, 1);
    this.hitCanvasContext_.drawImage(this.image_.getImage(),
        pixelOnFrameBuffer[0], pixelOnFrameBuffer[1], 1, 1, 0, 0, 1, 1);

    var imageData = this.hitCanvasContext_.getImageData(0, 0, 1, 1).data;
    if (imageData[3] > 0) {
      return callback.call(thisArg, this.getLayer(),  imageData);
    } else {
      return undefined;
    }
  }
};


/**
 * The transformation matrix to get the pixel on the image for a
 * pixel on the map.
 * @param {ol.Size} mapSize The map size.
 * @param {ol.Size} imageSize The image size.
 * @return {ol.Transform} The transformation matrix.
 * @private
 */
ol.renderer.webgl.ImageLayer.prototype.getHitTransformationMatrix_ = function(mapSize, imageSize) {
  // the first matrix takes a map pixel, flips the y-axis and scales to
  // a range between -1 ... 1
  var mapCoordTransform = ol.transform.create();
  ol.transform.translate(mapCoordTransform, -1, -1);
  ol.transform.scale(mapCoordTransform, 2 / mapSize[0], 2 / mapSize[1]);
  ol.transform.translate(mapCoordTransform, 0, mapSize[1]);
  ol.transform.scale(mapCoordTransform, 1, -1);

  // the second matrix is the inverse of the projection matrix used in the
  // shader for drawing
  var projectionMatrixInv = ol.transform.invert(this.projectionMatrix.slice());

  // the third matrix scales to the image dimensions and flips the y-axis again
  var transform = ol.transform.create();
  ol.transform.translate(transform, 0, imageSize[1]);
  ol.transform.scale(transform, 1, -1);
  ol.transform.scale(transform, imageSize[0] / 2, imageSize[1] / 2);
  ol.transform.translate(transform, 1, 1);

  ol.transform.multiply(transform, projectionMatrixInv);
  ol.transform.multiply(transform, mapCoordTransform);

  return transform;
};

// This file is automatically generated, do not edit
goog.provide('ol.renderer.webgl.tilelayershader');

goog.require('ol');
goog.require('ol.webgl.Fragment');
goog.require('ol.webgl.Vertex');


/**
 * @constructor
 * @extends {ol.webgl.Fragment}
 * @struct
 */
ol.renderer.webgl.tilelayershader.Fragment = function() {
  ol.webgl.Fragment.call(this, ol.renderer.webgl.tilelayershader.Fragment.SOURCE);
};
ol.inherits(ol.renderer.webgl.tilelayershader.Fragment, ol.webgl.Fragment);


/**
 * @const
 * @type {string}
 */
ol.renderer.webgl.tilelayershader.Fragment.DEBUG_SOURCE = 'precision mediump float;\nvarying vec2 v_texCoord;\n\n\nuniform sampler2D u_texture;\n\nvoid main(void) {\n  gl_FragColor = texture2D(u_texture, v_texCoord);\n}\n';


/**
 * @const
 * @type {string}
 */
ol.renderer.webgl.tilelayershader.Fragment.OPTIMIZED_SOURCE = 'precision mediump float;varying vec2 a;uniform sampler2D e;void main(void){gl_FragColor=texture2D(e,a);}';


/**
 * @const
 * @type {string}
 */
ol.renderer.webgl.tilelayershader.Fragment.SOURCE = goog.DEBUG ?
    ol.renderer.webgl.tilelayershader.Fragment.DEBUG_SOURCE :
    ol.renderer.webgl.tilelayershader.Fragment.OPTIMIZED_SOURCE;


ol.renderer.webgl.tilelayershader.fragment = new ol.renderer.webgl.tilelayershader.Fragment();


/**
 * @constructor
 * @extends {ol.webgl.Vertex}
 * @struct
 */
ol.renderer.webgl.tilelayershader.Vertex = function() {
  ol.webgl.Vertex.call(this, ol.renderer.webgl.tilelayershader.Vertex.SOURCE);
};
ol.inherits(ol.renderer.webgl.tilelayershader.Vertex, ol.webgl.Vertex);


/**
 * @const
 * @type {string}
 */
ol.renderer.webgl.tilelayershader.Vertex.DEBUG_SOURCE = 'varying vec2 v_texCoord;\n\n\nattribute vec2 a_position;\nattribute vec2 a_texCoord;\nuniform vec4 u_tileOffset;\n\nvoid main(void) {\n  gl_Position = vec4(a_position * u_tileOffset.xy + u_tileOffset.zw, 0., 1.);\n  v_texCoord = a_texCoord;\n}\n\n\n';


/**
 * @const
 * @type {string}
 */
ol.renderer.webgl.tilelayershader.Vertex.OPTIMIZED_SOURCE = 'varying vec2 a;attribute vec2 b;attribute vec2 c;uniform vec4 d;void main(void){gl_Position=vec4(b*d.xy+d.zw,0.,1.);a=c;}';


/**
 * @const
 * @type {string}
 */
ol.renderer.webgl.tilelayershader.Vertex.SOURCE = goog.DEBUG ?
    ol.renderer.webgl.tilelayershader.Vertex.DEBUG_SOURCE :
    ol.renderer.webgl.tilelayershader.Vertex.OPTIMIZED_SOURCE;


ol.renderer.webgl.tilelayershader.vertex = new ol.renderer.webgl.tilelayershader.Vertex();


/**
 * @constructor
 * @param {WebGLRenderingContext} gl GL.
 * @param {WebGLProgram} program Program.
 * @struct
 */
ol.renderer.webgl.tilelayershader.Locations = function(gl, program) {

  /**
   * @type {WebGLUniformLocation}
   */
  this.u_texture = gl.getUniformLocation(
      program, goog.DEBUG ? 'u_texture' : 'e');

  /**
   * @type {WebGLUniformLocation}
   */
  this.u_tileOffset = gl.getUniformLocation(
      program, goog.DEBUG ? 'u_tileOffset' : 'd');

  /**
   * @type {number}
   */
  this.a_position = gl.getAttribLocation(
      program, goog.DEBUG ? 'a_position' : 'b');

  /**
   * @type {number}
   */
  this.a_texCoord = gl.getAttribLocation(
      program, goog.DEBUG ? 'a_texCoord' : 'c');
};

// FIXME large resolutions lead to too large framebuffers :-(
// FIXME animated shaders! check in redraw

goog.provide('ol.renderer.webgl.TileLayer');

goog.require('ol');
goog.require('ol.Tile');
goog.require('ol.TileRange');
goog.require('ol.array');
goog.require('ol.extent');
goog.require('ol.math');
goog.require('ol.renderer.webgl.Layer');
goog.require('ol.renderer.webgl.tilelayershader');
goog.require('ol.size');
goog.require('ol.transform');
goog.require('ol.webgl');
goog.require('ol.webgl.Buffer');


/**
 * @constructor
 * @extends {ol.renderer.webgl.Layer}
 * @param {ol.renderer.webgl.Map} mapRenderer Map renderer.
 * @param {ol.layer.Tile} tileLayer Tile layer.
 */
ol.renderer.webgl.TileLayer = function(mapRenderer, tileLayer) {

  ol.renderer.webgl.Layer.call(this, mapRenderer, tileLayer);

  /**
   * @private
   * @type {ol.webgl.Fragment}
   */
  this.fragmentShader_ = ol.renderer.webgl.tilelayershader.fragment;

  /**
   * @private
   * @type {ol.webgl.Vertex}
   */
  this.vertexShader_ = ol.renderer.webgl.tilelayershader.vertex;

  /**
   * @private
   * @type {ol.renderer.webgl.tilelayershader.Locations}
   */
  this.locations_ = null;

  /**
   * @private
   * @type {ol.webgl.Buffer}
   */
  this.renderArrayBuffer_ = new ol.webgl.Buffer([
    0, 0, 0, 1,
    1, 0, 1, 1,
    0, 1, 0, 0,
    1, 1, 1, 0
  ]);

  /**
   * @private
   * @type {ol.TileRange}
   */
  this.renderedTileRange_ = null;

  /**
   * @private
   * @type {ol.Extent}
   */
  this.renderedFramebufferExtent_ = null;

  /**
   * @private
   * @type {number}
   */
  this.renderedRevision_ = -1;

  /**
   * @private
   * @type {ol.Size}
   */
  this.tmpSize_ = [0, 0];

};
ol.inherits(ol.renderer.webgl.TileLayer, ol.renderer.webgl.Layer);


/**
 * @inheritDoc
 */
ol.renderer.webgl.TileLayer.prototype.disposeInternal = function() {
  var context = this.mapRenderer.getContext();
  context.deleteBuffer(this.renderArrayBuffer_);
  ol.renderer.webgl.Layer.prototype.disposeInternal.call(this);
};


/**
 * Create a function that adds loaded tiles to the tile lookup.
 * @param {ol.source.Tile} source Tile source.
 * @param {ol.proj.Projection} projection Projection of the tiles.
 * @param {Object.<number, Object.<string, ol.Tile>>} tiles Lookup of loaded
 *     tiles by zoom level.
 * @return {function(number, ol.TileRange):boolean} A function that can be
 *     called with a zoom level and a tile range to add loaded tiles to the
 *     lookup.
 * @protected
 */
ol.renderer.webgl.TileLayer.prototype.createLoadedTileFinder = function(source, projection, tiles) {
  var mapRenderer = this.mapRenderer;

  return (
      /**
       * @param {number} zoom Zoom level.
       * @param {ol.TileRange} tileRange Tile range.
       * @return {boolean} The tile range is fully loaded.
       */
      function(zoom, tileRange) {
        function callback(tile) {
          var loaded = mapRenderer.isTileTextureLoaded(tile);
          if (loaded) {
            if (!tiles[zoom]) {
              tiles[zoom] = {};
            }
            tiles[zoom][tile.tileCoord.toString()] = tile;
          }
          return loaded;
        }
        return source.forEachLoadedTile(projection, zoom, tileRange, callback);
      });
};


/**
 * @inheritDoc
 */
ol.renderer.webgl.TileLayer.prototype.handleWebGLContextLost = function() {
  ol.renderer.webgl.Layer.prototype.handleWebGLContextLost.call(this);
  this.locations_ = null;
};


/**
 * @inheritDoc
 */
ol.renderer.webgl.TileLayer.prototype.prepareFrame = function(frameState, layerState, context) {

  var mapRenderer = this.mapRenderer;
  var gl = context.getGL();

  var viewState = frameState.viewState;
  var projection = viewState.projection;

  var tileLayer = /** @type {ol.layer.Tile} */ (this.getLayer());
  var tileSource = tileLayer.getSource();
  var tileGrid = tileSource.getTileGridForProjection(projection);
  var z = tileGrid.getZForResolution(viewState.resolution);
  var tileResolution = tileGrid.getResolution(z);

  var tilePixelSize =
      tileSource.getTilePixelSize(z, frameState.pixelRatio, projection);
  var pixelRatio = tilePixelSize[0] /
      ol.size.toSize(tileGrid.getTileSize(z), this.tmpSize_)[0];
  var tilePixelResolution = tileResolution / pixelRatio;
  var tileGutter = frameState.pixelRatio * tileSource.getGutter(projection);

  var center = viewState.center;
  var extent;
  if (tileResolution == viewState.resolution) {
    center = this.snapCenterToPixel(center, tileResolution, frameState.size);
    extent = ol.extent.getForViewAndSize(
        center, tileResolution, viewState.rotation, frameState.size);
  } else {
    extent = frameState.extent;
  }
  var tileRange = tileGrid.getTileRangeForExtentAndResolution(
      extent, tileResolution);

  var framebufferExtent;
  if (this.renderedTileRange_ &&
      this.renderedTileRange_.equals(tileRange) &&
      this.renderedRevision_ == tileSource.getRevision()) {
    framebufferExtent = this.renderedFramebufferExtent_;
  } else {

    var tileRangeSize = tileRange.getSize();

    var maxDimension = Math.max(
        tileRangeSize[0] * tilePixelSize[0],
        tileRangeSize[1] * tilePixelSize[1]);
    var framebufferDimension = ol.math.roundUpToPowerOfTwo(maxDimension);
    var framebufferExtentDimension = tilePixelResolution * framebufferDimension;
    var origin = tileGrid.getOrigin(z);
    var minX = origin[0] +
        tileRange.minX * tilePixelSize[0] * tilePixelResolution;
    var minY = origin[1] +
        tileRange.minY * tilePixelSize[1] * tilePixelResolution;
    framebufferExtent = [
      minX, minY,
      minX + framebufferExtentDimension, minY + framebufferExtentDimension
    ];

    this.bindFramebuffer(frameState, framebufferDimension);
    gl.viewport(0, 0, framebufferDimension, framebufferDimension);

    gl.clearColor(0, 0, 0, 0);
    gl.clear(ol.webgl.COLOR_BUFFER_BIT);
    gl.disable(ol.webgl.BLEND);

    var program = context.getProgram(this.fragmentShader_, this.vertexShader_);
    context.useProgram(program);
    if (!this.locations_) {
      this.locations_ =
          new ol.renderer.webgl.tilelayershader.Locations(gl, program);
    }

    context.bindBuffer(ol.webgl.ARRAY_BUFFER, this.renderArrayBuffer_);
    gl.enableVertexAttribArray(this.locations_.a_position);
    gl.vertexAttribPointer(
        this.locations_.a_position, 2, ol.webgl.FLOAT, false, 16, 0);
    gl.enableVertexAttribArray(this.locations_.a_texCoord);
    gl.vertexAttribPointer(
        this.locations_.a_texCoord, 2, ol.webgl.FLOAT, false, 16, 8);
    gl.uniform1i(this.locations_.u_texture, 0);

    /**
     * @type {Object.<number, Object.<string, ol.Tile>>}
     */
    var tilesToDrawByZ = {};
    tilesToDrawByZ[z] = {};

    var findLoadedTiles = this.createLoadedTileFinder(
        tileSource, projection, tilesToDrawByZ);

    var useInterimTilesOnError = tileLayer.getUseInterimTilesOnError();
    var allTilesLoaded = true;
    var tmpExtent = ol.extent.createEmpty();
    var tmpTileRange = new ol.TileRange(0, 0, 0, 0);
    var childTileRange, drawable, fullyLoaded, tile, tileState;
    var x, y, tileExtent;
    for (x = tileRange.minX; x <= tileRange.maxX; ++x) {
      for (y = tileRange.minY; y <= tileRange.maxY; ++y) {

        tile = tileSource.getTile(z, x, y, pixelRatio, projection);
        if (layerState.extent !== undefined) {
          // ignore tiles outside layer extent
          tileExtent = tileGrid.getTileCoordExtent(tile.tileCoord, tmpExtent);
          if (!ol.extent.intersects(tileExtent, layerState.extent)) {
            continue;
          }
        }
        tileState = tile.getState();
        drawable = tileState == ol.Tile.State.LOADED ||
            tileState == ol.Tile.State.EMPTY ||
            tileState == ol.Tile.State.ERROR && !useInterimTilesOnError;
        if (!drawable && tile.interimTile) {
          tile = tile.interimTile;
        }
        tileState = tile.getState();
        if (tileState == ol.Tile.State.LOADED) {
          if (mapRenderer.isTileTextureLoaded(tile)) {
            tilesToDrawByZ[z][tile.tileCoord.toString()] = tile;
            continue;
          }
        } else if (tileState == ol.Tile.State.EMPTY ||
                   (tileState == ol.Tile.State.ERROR &&
                    !useInterimTilesOnError)) {
          continue;
        }

        allTilesLoaded = false;
        fullyLoaded = tileGrid.forEachTileCoordParentTileRange(
            tile.tileCoord, findLoadedTiles, null, tmpTileRange, tmpExtent);
        if (!fullyLoaded) {
          childTileRange = tileGrid.getTileCoordChildTileRange(
              tile.tileCoord, tmpTileRange, tmpExtent);
          if (childTileRange) {
            findLoadedTiles(z + 1, childTileRange);
          }
        }

      }

    }

    /** @type {Array.<number>} */
    var zs = Object.keys(tilesToDrawByZ).map(Number);
    zs.sort(ol.array.numberSafeCompareFunction);
    var u_tileOffset = new Float32Array(4);
    var i, ii, tileKey, tilesToDraw;
    for (i = 0, ii = zs.length; i < ii; ++i) {
      tilesToDraw = tilesToDrawByZ[zs[i]];
      for (tileKey in tilesToDraw) {
        tile = tilesToDraw[tileKey];
        tileExtent = tileGrid.getTileCoordExtent(tile.tileCoord, tmpExtent);
        u_tileOffset[0] = 2 * (tileExtent[2] - tileExtent[0]) /
            framebufferExtentDimension;
        u_tileOffset[1] = 2 * (tileExtent[3] - tileExtent[1]) /
            framebufferExtentDimension;
        u_tileOffset[2] = 2 * (tileExtent[0] - framebufferExtent[0]) /
            framebufferExtentDimension - 1;
        u_tileOffset[3] = 2 * (tileExtent[1] - framebufferExtent[1]) /
            framebufferExtentDimension - 1;
        gl.uniform4fv(this.locations_.u_tileOffset, u_tileOffset);
        mapRenderer.bindTileTexture(tile, tilePixelSize,
            tileGutter * pixelRatio, ol.webgl.LINEAR, ol.webgl.LINEAR);
        gl.drawArrays(ol.webgl.TRIANGLE_STRIP, 0, 4);
      }
    }

    if (allTilesLoaded) {
      this.renderedTileRange_ = tileRange;
      this.renderedFramebufferExtent_ = framebufferExtent;
      this.renderedRevision_ = tileSource.getRevision();
    } else {
      this.renderedTileRange_ = null;
      this.renderedFramebufferExtent_ = null;
      this.renderedRevision_ = -1;
      frameState.animate = true;
    }

  }

  this.updateUsedTiles(frameState.usedTiles, tileSource, z, tileRange);
  var tileTextureQueue = mapRenderer.getTileTextureQueue();
  this.manageTilePyramid(
      frameState, tileSource, tileGrid, pixelRatio, projection, extent, z,
      tileLayer.getPreload(),
      /**
       * @param {ol.Tile} tile Tile.
       */
      function(tile) {
        if (tile.getState() == ol.Tile.State.LOADED &&
            !mapRenderer.isTileTextureLoaded(tile) &&
            !tileTextureQueue.isKeyQueued(tile.getKey())) {
          tileTextureQueue.enqueue([
            tile,
            tileGrid.getTileCoordCenter(tile.tileCoord),
            tileGrid.getResolution(tile.tileCoord[0]),
            tilePixelSize, tileGutter * pixelRatio
          ]);
        }
      }, this);
  this.scheduleExpireCache(frameState, tileSource);
  this.updateLogos(frameState, tileSource);

  var texCoordMatrix = this.texCoordMatrix;
  ol.transform.reset(texCoordMatrix);
  ol.transform.translate(texCoordMatrix,
      (center[0] - framebufferExtent[0]) /
          (framebufferExtent[2] - framebufferExtent[0]),
      (center[1] - framebufferExtent[1]) /
          (framebufferExtent[3] - framebufferExtent[1]));
  if (viewState.rotation !== 0) {
    ol.transform.rotate(texCoordMatrix, viewState.rotation);
  }
  ol.transform.scale(texCoordMatrix,
      frameState.size[0] * viewState.resolution /
          (framebufferExtent[2] - framebufferExtent[0]),
      frameState.size[1] * viewState.resolution /
          (framebufferExtent[3] - framebufferExtent[1]));
  ol.transform.translate(texCoordMatrix, -0.5, -0.5);

  return true;
};


/**
 * @param {ol.Pixel} pixel Pixel.
 * @param {olx.FrameState} frameState FrameState.
 * @param {function(this: S, ol.layer.Layer, ol.Color): T} callback Layer
 *     callback.
 * @param {S} thisArg Value to use as `this` when executing `callback`.
 * @return {T|undefined} Callback result.
 * @template S,T,U
 */
ol.renderer.webgl.TileLayer.prototype.forEachLayerAtPixel = function(pixel, frameState, callback, thisArg) {
  if (!this.framebuffer) {
    return undefined;
  }

  var pixelOnMapScaled = [
    pixel[0] / frameState.size[0],
    (frameState.size[1] - pixel[1]) / frameState.size[1]];

  var pixelOnFrameBufferScaled = ol.transform.apply(
      this.texCoordMatrix, pixelOnMapScaled.slice());
  var pixelOnFrameBuffer = [
    pixelOnFrameBufferScaled[0] * this.framebufferDimension,
    pixelOnFrameBufferScaled[1] * this.framebufferDimension];

  var gl = this.mapRenderer.getContext().getGL();
  gl.bindFramebuffer(gl.FRAMEBUFFER, this.framebuffer);
  var imageData = new Uint8Array(4);
  gl.readPixels(pixelOnFrameBuffer[0], pixelOnFrameBuffer[1], 1, 1,
      gl.RGBA, gl.UNSIGNED_BYTE, imageData);

  if (imageData[3] > 0) {
    return callback.call(thisArg, this.getLayer(),  imageData);
  } else {
    return undefined;
  }
};

goog.provide('ol.renderer.webgl.VectorLayer');

goog.require('ol');
goog.require('ol.View');
goog.require('ol.extent');
goog.require('ol.render.webgl.ReplayGroup');
goog.require('ol.renderer.vector');
goog.require('ol.renderer.webgl.Layer');
goog.require('ol.transform');


/**
 * @constructor
 * @extends {ol.renderer.webgl.Layer}
 * @param {ol.renderer.webgl.Map} mapRenderer Map renderer.
 * @param {ol.layer.Vector} vectorLayer Vector layer.
 */
ol.renderer.webgl.VectorLayer = function(mapRenderer, vectorLayer) {

  ol.renderer.webgl.Layer.call(this, mapRenderer, vectorLayer);

  /**
   * @private
   * @type {boolean}
   */
  this.dirty_ = false;

  /**
   * @private
   * @type {number}
   */
  this.renderedRevision_ = -1;

  /**
   * @private
   * @type {number}
   */
  this.renderedResolution_ = NaN;

  /**
   * @private
   * @type {ol.Extent}
   */
  this.renderedExtent_ = ol.extent.createEmpty();

  /**
   * @private
   * @type {function(ol.Feature, ol.Feature): number|null}
   */
  this.renderedRenderOrder_ = null;

  /**
   * @private
   * @type {ol.render.webgl.ReplayGroup}
   */
  this.replayGroup_ = null;

  /**
   * The last layer state.
   * @private
   * @type {?ol.LayerState}
   */
  this.layerState_ = null;

};
ol.inherits(ol.renderer.webgl.VectorLayer, ol.renderer.webgl.Layer);


/**
 * @inheritDoc
 */
ol.renderer.webgl.VectorLayer.prototype.composeFrame = function(frameState, layerState, context) {
  this.layerState_ = layerState;
  var viewState = frameState.viewState;
  var replayGroup = this.replayGroup_;
  if (replayGroup && !replayGroup.isEmpty()) {
    replayGroup.replay(context,
        viewState.center, viewState.resolution, viewState.rotation,
        frameState.size, frameState.pixelRatio, layerState.opacity,
        layerState.managed ? frameState.skippedFeatureUids : {});
  }

};


/**
 * @inheritDoc
 */
ol.renderer.webgl.VectorLayer.prototype.disposeInternal = function() {
  var replayGroup = this.replayGroup_;
  if (replayGroup) {
    var context = this.mapRenderer.getContext();
    replayGroup.getDeleteResourcesFunction(context)();
    this.replayGroup_ = null;
  }
  ol.renderer.webgl.Layer.prototype.disposeInternal.call(this);
};


/**
 * @inheritDoc
 */
ol.renderer.webgl.VectorLayer.prototype.forEachFeatureAtCoordinate = function(coordinate, frameState, callback, thisArg) {
  if (!this.replayGroup_ || !this.layerState_) {
    return undefined;
  } else {
    var context = this.mapRenderer.getContext();
    var viewState = frameState.viewState;
    var layer = this.getLayer();
    var layerState = this.layerState_;
    /** @type {Object.<string, boolean>} */
    var features = {};
    return this.replayGroup_.forEachFeatureAtCoordinate(coordinate,
        context, viewState.center, viewState.resolution, viewState.rotation,
        frameState.size, frameState.pixelRatio, layerState.opacity,
        {},
        /**
         * @param {ol.Feature|ol.render.Feature} feature Feature.
         * @return {?} Callback result.
         */
        function(feature) {
          var key = ol.getUid(feature).toString();
          if (!(key in features)) {
            features[key] = true;
            return callback.call(thisArg, feature, layer);
          }
        });
  }
};


/**
 * @inheritDoc
 */
ol.renderer.webgl.VectorLayer.prototype.hasFeatureAtCoordinate = function(coordinate, frameState) {
  if (!this.replayGroup_ || !this.layerState_) {
    return false;
  } else {
    var context = this.mapRenderer.getContext();
    var viewState = frameState.viewState;
    var layerState = this.layerState_;
    return this.replayGroup_.hasFeatureAtCoordinate(coordinate,
        context, viewState.center, viewState.resolution, viewState.rotation,
        frameState.size, frameState.pixelRatio, layerState.opacity,
        frameState.skippedFeatureUids);
  }
};


/**
 * @param {ol.Pixel} pixel Pixel.
 * @param {olx.FrameState} frameState FrameState.
 * @param {function(this: S, ol.layer.Layer, ol.Color): T} callback Layer
 *     callback.
 * @param {S} thisArg Value to use as `this` when executing `callback`.
 * @return {T|undefined} Callback result.
 * @template S,T,U
 */
ol.renderer.webgl.VectorLayer.prototype.forEachLayerAtPixel = function(pixel, frameState, callback, thisArg) {
  var coordinate = ol.transform.apply(
      frameState.pixelToCoordinateTransform, pixel.slice());
  var hasFeature = this.hasFeatureAtCoordinate(coordinate, frameState);

  if (hasFeature) {
    return callback.call(thisArg, this.getLayer(), null);
  } else {
    return undefined;
  }
};


/**
 * Handle changes in image style state.
 * @param {ol.events.Event} event Image style change event.
 * @private
 */
ol.renderer.webgl.VectorLayer.prototype.handleStyleImageChange_ = function(event) {
  this.renderIfReadyAndVisible();
};


/**
 * @inheritDoc
 */
ol.renderer.webgl.VectorLayer.prototype.prepareFrame = function(frameState, layerState, context) {

  var vectorLayer = /** @type {ol.layer.Vector} */ (this.getLayer());
  var vectorSource = vectorLayer.getSource();

  this.updateAttributions(
      frameState.attributions, vectorSource.getAttributions());
  this.updateLogos(frameState, vectorSource);

  var animating = frameState.viewHints[ol.View.Hint.ANIMATING];
  var interacting = frameState.viewHints[ol.View.Hint.INTERACTING];
  var updateWhileAnimating = vectorLayer.getUpdateWhileAnimating();
  var updateWhileInteracting = vectorLayer.getUpdateWhileInteracting();

  if (!this.dirty_ && (!updateWhileAnimating && animating) ||
      (!updateWhileInteracting && interacting)) {
    return true;
  }

  var frameStateExtent = frameState.extent;
  var viewState = frameState.viewState;
  var projection = viewState.projection;
  var resolution = viewState.resolution;
  var pixelRatio = frameState.pixelRatio;
  var vectorLayerRevision = vectorLayer.getRevision();
  var vectorLayerRenderBuffer = vectorLayer.getRenderBuffer();
  var vectorLayerRenderOrder = vectorLayer.getRenderOrder();

  if (vectorLayerRenderOrder === undefined) {
    vectorLayerRenderOrder = ol.renderer.vector.defaultOrder;
  }

  var extent = ol.extent.buffer(frameStateExtent,
      vectorLayerRenderBuffer * resolution);

  if (!this.dirty_ &&
      this.renderedResolution_ == resolution &&
      this.renderedRevision_ == vectorLayerRevision &&
      this.renderedRenderOrder_ == vectorLayerRenderOrder &&
      ol.extent.containsExtent(this.renderedExtent_, extent)) {
    return true;
  }

  if (this.replayGroup_) {
    frameState.postRenderFunctions.push(
        this.replayGroup_.getDeleteResourcesFunction(context));
  }

  this.dirty_ = false;

  var replayGroup = new ol.render.webgl.ReplayGroup(
      ol.renderer.vector.getTolerance(resolution, pixelRatio),
      extent, vectorLayer.getRenderBuffer());
  vectorSource.loadFeatures(extent, resolution, projection);
  /**
   * @param {ol.Feature} feature Feature.
   * @this {ol.renderer.webgl.VectorLayer}
   */
  var renderFeature = function(feature) {
    var styles;
    var styleFunction = feature.getStyleFunction();
    if (styleFunction) {
      styles = styleFunction.call(feature, resolution);
    } else {
      styleFunction = vectorLayer.getStyleFunction();
      if (styleFunction) {
        styles = styleFunction(feature, resolution);
      }
    }
    if (styles) {
      var dirty = this.renderFeature(
          feature, resolution, pixelRatio, styles, replayGroup);
      this.dirty_ = this.dirty_ || dirty;
    }
  };
  if (vectorLayerRenderOrder) {
    /** @type {Array.<ol.Feature>} */
    var features = [];
    vectorSource.forEachFeatureInExtent(extent,
        /**
         * @param {ol.Feature} feature Feature.
         */
        function(feature) {
          features.push(feature);
        }, this);
    features.sort(vectorLayerRenderOrder);
    features.forEach(renderFeature, this);
  } else {
    vectorSource.forEachFeatureInExtent(extent, renderFeature, this);
  }
  replayGroup.finish(context);

  this.renderedResolution_ = resolution;
  this.renderedRevision_ = vectorLayerRevision;
  this.renderedRenderOrder_ = vectorLayerRenderOrder;
  this.renderedExtent_ = extent;
  this.replayGroup_ = replayGroup;

  return true;
};


/**
 * @param {ol.Feature} feature Feature.
 * @param {number} resolution Resolution.
 * @param {number} pixelRatio Pixel ratio.
 * @param {(ol.style.Style|Array.<ol.style.Style>)} styles The style or array of
 *     styles.
 * @param {ol.render.webgl.ReplayGroup} replayGroup Replay group.
 * @return {boolean} `true` if an image is loading.
 */
ol.renderer.webgl.VectorLayer.prototype.renderFeature = function(feature, resolution, pixelRatio, styles, replayGroup) {
  if (!styles) {
    return false;
  }
  var loading = false;
  if (Array.isArray(styles)) {
    for (var i = 0, ii = styles.length; i < ii; ++i) {
      loading = ol.renderer.vector.renderFeature(
          replayGroup, feature, styles[i],
          ol.renderer.vector.getSquaredTolerance(resolution, pixelRatio),
          this.handleStyleImageChange_, this) || loading;
    }
  } else {
    loading = ol.renderer.vector.renderFeature(
        replayGroup, feature, styles,
        ol.renderer.vector.getSquaredTolerance(resolution, pixelRatio),
        this.handleStyleImageChange_, this) || loading;
  }
  return loading;
};

goog.provide('ol.structs.LRUCache');

goog.require('ol.asserts');
goog.require('ol.obj');


/**
 * Implements a Least-Recently-Used cache where the keys do not conflict with
 * Object's properties (e.g. 'hasOwnProperty' is not allowed as a key). Expiring
 * items from the cache is the responsibility of the user.
 * @constructor
 * @struct
 * @template T
 */
ol.structs.LRUCache = function() {

  /**
   * @private
   * @type {number}
   */
  this.count_ = 0;

  /**
   * @private
   * @type {!Object.<string, ol.LRUCacheEntry>}
   */
  this.entries_ = {};

  /**
   * @private
   * @type {?ol.LRUCacheEntry}
   */
  this.oldest_ = null;

  /**
   * @private
   * @type {?ol.LRUCacheEntry}
   */
  this.newest_ = null;

};


if (goog.DEBUG) {
  /**
   * FIXME empty description for jsdoc
   */
  ol.structs.LRUCache.prototype.assertValid = function() {
    if (this.count_ === 0) {
      console.assert(ol.obj.isEmpty(this.entries_),
          'entries must be an empty object (count = 0)');
      console.assert(!this.oldest_,
          'oldest must be null (count = 0)');
      console.assert(!this.newest_,
          'newest must be null (count = 0)');
    } else {
      console.assert(Object.keys(this.entries_).length == this.count_,
          'number of entries matches count');
      console.assert(this.oldest_,
          'we have an oldest entry');
      console.assert(!this.oldest_.older,
          'no entry is older than oldest');
      console.assert(this.newest_,
          'we have a newest entry');
      console.assert(!this.newest_.newer,
          'no entry is newer than newest');
      var i, entry;
      var older = null;
      i = 0;
      for (entry = this.oldest_; entry; entry = entry.newer) {
        console.assert(entry.older === older,
            'entry.older links to correct older');
        older = entry;
        ++i;
      }
      console.assert(i == this.count_, 'iterated correct amount of times');
      var newer = null;
      i = 0;
      for (entry = this.newest_; entry; entry = entry.older) {
        console.assert(entry.newer === newer,
            'entry.newer links to correct newer');
        newer = entry;
        ++i;
      }
      console.assert(i == this.count_, 'iterated correct amount of times');
    }
  };
}


/**
 * FIXME empty description for jsdoc
 */
ol.structs.LRUCache.prototype.clear = function() {
  this.count_ = 0;
  this.entries_ = {};
  this.oldest_ = null;
  this.newest_ = null;
};


/**
 * @param {string} key Key.
 * @return {boolean} Contains key.
 */
ol.structs.LRUCache.prototype.containsKey = function(key) {
  return this.entries_.hasOwnProperty(key);
};


/**
 * @param {function(this: S, T, string, ol.structs.LRUCache): ?} f The function
 *     to call for every entry from the oldest to the newer. This function takes
 *     3 arguments (the entry value, the entry key and the LRUCache object).
 *     The return value is ignored.
 * @param {S=} opt_this The object to use as `this` in `f`.
 * @template S
 */
ol.structs.LRUCache.prototype.forEach = function(f, opt_this) {
  var entry = this.oldest_;
  while (entry) {
    f.call(opt_this, entry.value_, entry.key_, this);
    entry = entry.newer;
  }
};


/**
 * @param {string} key Key.
 * @return {T} Value.
 */
ol.structs.LRUCache.prototype.get = function(key) {
  var entry = this.entries_[key];
  ol.asserts.assert(entry !== undefined,
      15); // Tried to get a value for a key that does not exist in the cache
  if (entry === this.newest_) {
    return entry.value_;
  } else if (entry === this.oldest_) {
    this.oldest_ = /** @type {ol.LRUCacheEntry} */ (this.oldest_.newer);
    this.oldest_.older = null;
  } else {
    entry.newer.older = entry.older;
    entry.older.newer = entry.newer;
  }
  entry.newer = null;
  entry.older = this.newest_;
  this.newest_.newer = entry;
  this.newest_ = entry;
  return entry.value_;
};


/**
 * @return {number} Count.
 */
ol.structs.LRUCache.prototype.getCount = function() {
  return this.count_;
};


/**
 * @return {Array.<string>} Keys.
 */
ol.structs.LRUCache.prototype.getKeys = function() {
  var keys = new Array(this.count_);
  var i = 0;
  var entry;
  for (entry = this.newest_; entry; entry = entry.older) {
    keys[i++] = entry.key_;
  }
  goog.DEBUG && console.assert(i == this.count_, 'iterated correct number of times');
  return keys;
};


/**
 * @return {Array.<T>} Values.
 */
ol.structs.LRUCache.prototype.getValues = function() {
  var values = new Array(this.count_);
  var i = 0;
  var entry;
  for (entry = this.newest_; entry; entry = entry.older) {
    values[i++] = entry.value_;
  }
  goog.DEBUG && console.assert(i == this.count_, 'iterated correct number of times');
  return values;
};


/**
 * @return {T} Last value.
 */
ol.structs.LRUCache.prototype.peekLast = function() {
  goog.DEBUG && console.assert(this.oldest_, 'oldest must not be null');
  return this.oldest_.value_;
};


/**
 * @return {string} Last key.
 */
ol.structs.LRUCache.prototype.peekLastKey = function() {
  goog.DEBUG && console.assert(this.oldest_, 'oldest must not be null');
  return this.oldest_.key_;
};


/**
 * @return {T} value Value.
 */
ol.structs.LRUCache.prototype.pop = function() {
  goog.DEBUG && console.assert(this.oldest_, 'oldest must not be null');
  goog.DEBUG && console.assert(this.newest_, 'newest must not be null');
  var entry = this.oldest_;
  goog.DEBUG && console.assert(entry.key_ in this.entries_,
      'oldest is indexed in entries');
  delete this.entries_[entry.key_];
  if (entry.newer) {
    entry.newer.older = null;
  }
  this.oldest_ = /** @type {ol.LRUCacheEntry} */ (entry.newer);
  if (!this.oldest_) {
    this.newest_ = null;
  }
  --this.count_;
  return entry.value_;
};


/**
 * @param {string} key Key.
 * @param {T} value Value.
 */
ol.structs.LRUCache.prototype.replace = function(key, value) {
  this.get(key);  // update `newest_`
  this.entries_[key].value_ = value;
};


/**
 * @param {string} key Key.
 * @param {T} value Value.
 */
ol.structs.LRUCache.prototype.set = function(key, value) {
  goog.DEBUG && console.assert(!(key in {}),
      'key is not a standard property of objects (e.g. "__proto__")');
  ol.asserts.assert(!(key in this.entries_),
      16); // Tried to set a value for a key that is used already
  var entry = /** @type {ol.LRUCacheEntry} */ ({
    key_: key,
    newer: null,
    older: this.newest_,
    value_: value
  });
  if (!this.newest_) {
    this.oldest_ = entry;
  } else {
    this.newest_.newer = entry;
  }
  this.newest_ = entry;
  this.entries_[key] = entry;
  ++this.count_;
};

// FIXME check against gl.getParameter(webgl.MAX_TEXTURE_SIZE)

goog.provide('ol.renderer.webgl.Map');

goog.require('ol');
goog.require('ol.RendererType');
goog.require('ol.array');
goog.require('ol.css');
goog.require('ol.dom');
goog.require('ol.events');
goog.require('ol.layer.Image');
goog.require('ol.layer.Layer');
goog.require('ol.layer.Tile');
goog.require('ol.layer.Vector');
goog.require('ol.render.Event');
goog.require('ol.render.EventType');
goog.require('ol.render.webgl.Immediate');
goog.require('ol.renderer.Map');
goog.require('ol.renderer.webgl.ImageLayer');
goog.require('ol.renderer.webgl.TileLayer');
goog.require('ol.renderer.webgl.VectorLayer');
goog.require('ol.source.State');
goog.require('ol.structs.LRUCache');
goog.require('ol.structs.PriorityQueue');
goog.require('ol.webgl');
goog.require('ol.webgl.Context');
goog.require('ol.webgl.ContextEventType');


/**
 * @constructor
 * @extends {ol.renderer.Map}
 * @param {Element} container Container.
 * @param {ol.Map} map Map.
 */
ol.renderer.webgl.Map = function(container, map) {

  ol.renderer.Map.call(this, container, map);

  /**
   * @private
   * @type {HTMLCanvasElement}
   */
  this.canvas_ = /** @type {HTMLCanvasElement} */
      (document.createElement('CANVAS'));
  this.canvas_.style.width = '100%';
  this.canvas_.style.height = '100%';
  this.canvas_.className = ol.css.CLASS_UNSELECTABLE;
  container.insertBefore(this.canvas_, container.childNodes[0] || null);

  /**
   * @private
   * @type {number}
   */
  this.clipTileCanvasWidth_ = 0;

  /**
   * @private
   * @type {number}
   */
  this.clipTileCanvasHeight_ = 0;

  /**
   * @private
   * @type {CanvasRenderingContext2D}
   */
  this.clipTileContext_ = ol.dom.createCanvasContext2D();

  /**
   * @private
   * @type {boolean}
   */
  this.renderedVisible_ = true;

  /**
   * @private
   * @type {WebGLRenderingContext}
   */
  this.gl_ = ol.webgl.getContext(this.canvas_, {
    antialias: true,
    depth: false,
    failIfMajorPerformanceCaveat: true,
    preserveDrawingBuffer: false,
    stencil: true
  });
  goog.DEBUG && console.assert(this.gl_, 'got a WebGLRenderingContext');

  /**
   * @private
   * @type {ol.webgl.Context}
   */
  this.context_ = new ol.webgl.Context(this.canvas_, this.gl_);

  ol.events.listen(this.canvas_, ol.webgl.ContextEventType.LOST,
      this.handleWebGLContextLost, this);
  ol.events.listen(this.canvas_, ol.webgl.ContextEventType.RESTORED,
      this.handleWebGLContextRestored, this);

  /**
   * @private
   * @type {ol.structs.LRUCache.<ol.WebglTextureCacheEntry|null>}
   */
  this.textureCache_ = new ol.structs.LRUCache();

  /**
   * @private
   * @type {ol.Coordinate}
   */
  this.focus_ = null;

  /**
   * @private
   * @type {ol.structs.PriorityQueue.<Array>}
   */
  this.tileTextureQueue_ = new ol.structs.PriorityQueue(
      /**
       * @param {Array.<*>} element Element.
       * @return {number} Priority.
       * @this {ol.renderer.webgl.Map}
       */
      (function(element) {
        var tileCenter = /** @type {ol.Coordinate} */ (element[1]);
        var tileResolution = /** @type {number} */ (element[2]);
        var deltaX = tileCenter[0] - this.focus_[0];
        var deltaY = tileCenter[1] - this.focus_[1];
        return 65536 * Math.log(tileResolution) +
            Math.sqrt(deltaX * deltaX + deltaY * deltaY) / tileResolution;
      }).bind(this),
      /**
       * @param {Array.<*>} element Element.
       * @return {string} Key.
       */
      function(element) {
        return /** @type {ol.Tile} */ (element[0]).getKey();
      });


 /**
  * @param {ol.Map} map Map.
  * @param {?olx.FrameState} frameState Frame state.
  * @return {boolean} false.
  * @this {ol.renderer.webgl.Map}
  */
  this.loadNextTileTexture_ =
      function(map, frameState) {
        if (!this.tileTextureQueue_.isEmpty()) {
          this.tileTextureQueue_.reprioritize();
          var element = this.tileTextureQueue_.dequeue();
          var tile = /** @type {ol.Tile} */ (element[0]);
          var tileSize = /** @type {ol.Size} */ (element[3]);
          var tileGutter = /** @type {number} */ (element[4]);
          this.bindTileTexture(
              tile, tileSize, tileGutter, ol.webgl.LINEAR, ol.webgl.LINEAR);
        }
        return false;
      }.bind(this);


  /**
   * @private
   * @type {number}
   */
  this.textureCacheFrameMarkerCount_ = 0;

  this.initializeGL_();

};
ol.inherits(ol.renderer.webgl.Map, ol.renderer.Map);


/**
 * @param {ol.Tile} tile Tile.
 * @param {ol.Size} tileSize Tile size.
 * @param {number} tileGutter Tile gutter.
 * @param {number} magFilter Mag filter.
 * @param {number} minFilter Min filter.
 */
ol.renderer.webgl.Map.prototype.bindTileTexture = function(tile, tileSize, tileGutter, magFilter, minFilter) {
  var gl = this.getGL();
  var tileKey = tile.getKey();
  if (this.textureCache_.containsKey(tileKey)) {
    var textureCacheEntry = this.textureCache_.get(tileKey);
    gl.bindTexture(ol.webgl.TEXTURE_2D, textureCacheEntry.texture);
    if (textureCacheEntry.magFilter != magFilter) {
      gl.texParameteri(
          ol.webgl.TEXTURE_2D, ol.webgl.TEXTURE_MAG_FILTER, magFilter);
      textureCacheEntry.magFilter = magFilter;
    }
    if (textureCacheEntry.minFilter != minFilter) {
      gl.texParameteri(
          ol.webgl.TEXTURE_2D, ol.webgl.TEXTURE_MIN_FILTER, minFilter);
      textureCacheEntry.minFilter = minFilter;
    }
  } else {
    var texture = gl.createTexture();
    gl.bindTexture(ol.webgl.TEXTURE_2D, texture);
    if (tileGutter > 0) {
      var clipTileCanvas = this.clipTileContext_.canvas;
      var clipTileContext = this.clipTileContext_;
      if (this.clipTileCanvasWidth_ !== tileSize[0] ||
          this.clipTileCanvasHeight_ !== tileSize[1]) {
        clipTileCanvas.width = tileSize[0];
        clipTileCanvas.height = tileSize[1];
        this.clipTileCanvasWidth_ = tileSize[0];
        this.clipTileCanvasHeight_ = tileSize[1];
      } else {
        clipTileContext.clearRect(0, 0, tileSize[0], tileSize[1]);
      }
      clipTileContext.drawImage(tile.getImage(), tileGutter, tileGutter,
          tileSize[0], tileSize[1], 0, 0, tileSize[0], tileSize[1]);
      gl.texImage2D(ol.webgl.TEXTURE_2D, 0,
          ol.webgl.RGBA, ol.webgl.RGBA,
          ol.webgl.UNSIGNED_BYTE, clipTileCanvas);
    } else {
      gl.texImage2D(ol.webgl.TEXTURE_2D, 0,
          ol.webgl.RGBA, ol.webgl.RGBA,
          ol.webgl.UNSIGNED_BYTE, tile.getImage());
    }
    gl.texParameteri(
        ol.webgl.TEXTURE_2D, ol.webgl.TEXTURE_MAG_FILTER, magFilter);
    gl.texParameteri(
        ol.webgl.TEXTURE_2D, ol.webgl.TEXTURE_MIN_FILTER, minFilter);
    gl.texParameteri(ol.webgl.TEXTURE_2D, ol.webgl.TEXTURE_WRAP_S,
        ol.webgl.CLAMP_TO_EDGE);
    gl.texParameteri(ol.webgl.TEXTURE_2D, ol.webgl.TEXTURE_WRAP_T,
        ol.webgl.CLAMP_TO_EDGE);
    this.textureCache_.set(tileKey, {
      texture: texture,
      magFilter: magFilter,
      minFilter: minFilter
    });
  }
};


/**
 * @inheritDoc
 */
ol.renderer.webgl.Map.prototype.createLayerRenderer = function(layer) {
  if (ol.ENABLE_IMAGE && layer instanceof ol.layer.Image) {
    return new ol.renderer.webgl.ImageLayer(this, layer);
  } else if (ol.ENABLE_TILE && layer instanceof ol.layer.Tile) {
    return new ol.renderer.webgl.TileLayer(this, layer);
  } else if (ol.ENABLE_VECTOR && layer instanceof ol.layer.Vector) {
    return new ol.renderer.webgl.VectorLayer(this, layer);
  } else {
    goog.DEBUG && console.assert(false, 'unexpected layer configuration');
    return null;
  }
};


/**
 * @param {ol.render.EventType} type Event type.
 * @param {olx.FrameState} frameState Frame state.
 * @private
 */
ol.renderer.webgl.Map.prototype.dispatchComposeEvent_ = function(type, frameState) {
  var map = this.getMap();
  if (map.hasListener(type)) {
    var context = this.context_;

    var extent = frameState.extent;
    var size = frameState.size;
    var viewState = frameState.viewState;
    var pixelRatio = frameState.pixelRatio;

    var resolution = viewState.resolution;
    var center = viewState.center;
    var rotation = viewState.rotation;

    var vectorContext = new ol.render.webgl.Immediate(context,
        center, resolution, rotation, size, extent, pixelRatio);
    var composeEvent = new ol.render.Event(type, vectorContext,
        frameState, null, context);
    map.dispatchEvent(composeEvent);
  }
};


/**
 * @inheritDoc
 */
ol.renderer.webgl.Map.prototype.disposeInternal = function() {
  var gl = this.getGL();
  if (!gl.isContextLost()) {
    this.textureCache_.forEach(
        /**
         * @param {?ol.WebglTextureCacheEntry} textureCacheEntry
         *     Texture cache entry.
         */
        function(textureCacheEntry) {
          if (textureCacheEntry) {
            gl.deleteTexture(textureCacheEntry.texture);
          }
        });
  }
  this.context_.dispose();
  ol.renderer.Map.prototype.disposeInternal.call(this);
};


/**
 * @param {ol.Map} map Map.
 * @param {olx.FrameState} frameState Frame state.
 * @private
 */
ol.renderer.webgl.Map.prototype.expireCache_ = function(map, frameState) {
  var gl = this.getGL();
  var textureCacheEntry;
  while (this.textureCache_.getCount() - this.textureCacheFrameMarkerCount_ >
      ol.WEBGL_TEXTURE_CACHE_HIGH_WATER_MARK) {
    textureCacheEntry = this.textureCache_.peekLast();
    if (!textureCacheEntry) {
      if (+this.textureCache_.peekLastKey() == frameState.index) {
        break;
      } else {
        --this.textureCacheFrameMarkerCount_;
      }
    } else {
      gl.deleteTexture(textureCacheEntry.texture);
    }
    this.textureCache_.pop();
  }
};


/**
 * @return {ol.webgl.Context} The context.
 */
ol.renderer.webgl.Map.prototype.getContext = function() {
  return this.context_;
};


/**
 * @return {WebGLRenderingContext} GL.
 */
ol.renderer.webgl.Map.prototype.getGL = function() {
  return this.gl_;
};


/**
 * @return {ol.structs.PriorityQueue.<Array>} Tile texture queue.
 */
ol.renderer.webgl.Map.prototype.getTileTextureQueue = function() {
  return this.tileTextureQueue_;
};


/**
 * @inheritDoc
 */
ol.renderer.webgl.Map.prototype.getType = function() {
  return ol.RendererType.WEBGL;
};


/**
 * @param {ol.events.Event} event Event.
 * @protected
 */
ol.renderer.webgl.Map.prototype.handleWebGLContextLost = function(event) {
  event.preventDefault();
  this.textureCache_.clear();
  this.textureCacheFrameMarkerCount_ = 0;

  var renderers = this.getLayerRenderers();
  for (var id in renderers) {
    var renderer = /** @type {ol.renderer.webgl.Layer} */ (renderers[id]);
    renderer.handleWebGLContextLost();
  }
};


/**
 * @protected
 */
ol.renderer.webgl.Map.prototype.handleWebGLContextRestored = function() {
  this.initializeGL_();
  this.getMap().render();
};


/**
 * @private
 */
ol.renderer.webgl.Map.prototype.initializeGL_ = function() {
  var gl = this.gl_;
  gl.activeTexture(ol.webgl.TEXTURE0);
  gl.blendFuncSeparate(
      ol.webgl.SRC_ALPHA, ol.webgl.ONE_MINUS_SRC_ALPHA,
      ol.webgl.ONE, ol.webgl.ONE_MINUS_SRC_ALPHA);
  gl.disable(ol.webgl.CULL_FACE);
  gl.disable(ol.webgl.DEPTH_TEST);
  gl.disable(ol.webgl.SCISSOR_TEST);
  gl.disable(ol.webgl.STENCIL_TEST);
};


/**
 * @param {ol.Tile} tile Tile.
 * @return {boolean} Is tile texture loaded.
 */
ol.renderer.webgl.Map.prototype.isTileTextureLoaded = function(tile) {
  return this.textureCache_.containsKey(tile.getKey());
};


/**
 * @inheritDoc
 */
ol.renderer.webgl.Map.prototype.renderFrame = function(frameState) {

  var context = this.getContext();
  var gl = this.getGL();

  if (gl.isContextLost()) {
    return false;
  }

  if (!frameState) {
    if (this.renderedVisible_) {
      this.canvas_.style.display = 'none';
      this.renderedVisible_ = false;
    }
    return false;
  }

  this.focus_ = frameState.focus;

  this.textureCache_.set((-frameState.index).toString(), null);
  ++this.textureCacheFrameMarkerCount_;

  this.dispatchComposeEvent_(ol.render.EventType.PRECOMPOSE, frameState);

  /** @type {Array.<ol.LayerState>} */
  var layerStatesToDraw = [];
  var layerStatesArray = frameState.layerStatesArray;
  ol.array.stableSort(layerStatesArray, ol.renderer.Map.sortByZIndex);

  var viewResolution = frameState.viewState.resolution;
  var i, ii, layerRenderer, layerState;
  for (i = 0, ii = layerStatesArray.length; i < ii; ++i) {
    layerState = layerStatesArray[i];
    if (ol.layer.Layer.visibleAtResolution(layerState, viewResolution) &&
        layerState.sourceState == ol.source.State.READY) {
      layerRenderer = /** @type {ol.renderer.webgl.Layer} */ (this.getLayerRenderer(layerState.layer));
      if (layerRenderer.prepareFrame(frameState, layerState, context)) {
        layerStatesToDraw.push(layerState);
      }
    }
  }

  var width = frameState.size[0] * frameState.pixelRatio;
  var height = frameState.size[1] * frameState.pixelRatio;
  if (this.canvas_.width != width || this.canvas_.height != height) {
    this.canvas_.width = width;
    this.canvas_.height = height;
  }

  gl.bindFramebuffer(ol.webgl.FRAMEBUFFER, null);

  gl.clearColor(0, 0, 0, 0);
  gl.clear(ol.webgl.COLOR_BUFFER_BIT);
  gl.enable(ol.webgl.BLEND);
  gl.viewport(0, 0, this.canvas_.width, this.canvas_.height);

  for (i = 0, ii = layerStatesToDraw.length; i < ii; ++i) {
    layerState = layerStatesToDraw[i];
    layerRenderer = /** @type {ol.renderer.webgl.Layer} */ (this.getLayerRenderer(layerState.layer));
    layerRenderer.composeFrame(frameState, layerState, context);
  }

  if (!this.renderedVisible_) {
    this.canvas_.style.display = '';
    this.renderedVisible_ = true;
  }

  this.calculateMatrices2D(frameState);

  if (this.textureCache_.getCount() - this.textureCacheFrameMarkerCount_ >
      ol.WEBGL_TEXTURE_CACHE_HIGH_WATER_MARK) {
    frameState.postRenderFunctions.push(
      /** @type {ol.PostRenderFunction} */ (this.expireCache_.bind(this))
    );
  }

  if (!this.tileTextureQueue_.isEmpty()) {
    frameState.postRenderFunctions.push(this.loadNextTileTexture_);
    frameState.animate = true;
  }

  this.dispatchComposeEvent_(ol.render.EventType.POSTCOMPOSE, frameState);

  this.scheduleRemoveUnusedLayerRenderers(frameState);
  this.scheduleExpireIconCache(frameState);

};


/**
 * @inheritDoc
 */
ol.renderer.webgl.Map.prototype.forEachFeatureAtCoordinate = function(coordinate, frameState, callback, thisArg,
        layerFilter, thisArg2) {
  var result;

  if (this.getGL().isContextLost()) {
    return false;
  }

  var viewState = frameState.viewState;

  var layerStates = frameState.layerStatesArray;
  var numLayers = layerStates.length;
  var i;
  for (i = numLayers - 1; i >= 0; --i) {
    var layerState = layerStates[i];
    var layer = layerState.layer;
    if (ol.layer.Layer.visibleAtResolution(layerState, viewState.resolution) &&
        layerFilter.call(thisArg2, layer)) {
      var layerRenderer = this.getLayerRenderer(layer);
      result = layerRenderer.forEachFeatureAtCoordinate(
          coordinate, frameState, callback, thisArg);
      if (result) {
        return result;
      }
    }
  }
  return undefined;
};


/**
 * @inheritDoc
 */
ol.renderer.webgl.Map.prototype.hasFeatureAtCoordinate = function(coordinate, frameState, layerFilter, thisArg) {
  var hasFeature = false;

  if (this.getGL().isContextLost()) {
    return false;
  }

  var viewState = frameState.viewState;

  var layerStates = frameState.layerStatesArray;
  var numLayers = layerStates.length;
  var i;
  for (i = numLayers - 1; i >= 0; --i) {
    var layerState = layerStates[i];
    var layer = layerState.layer;
    if (ol.layer.Layer.visibleAtResolution(layerState, viewState.resolution) &&
        layerFilter.call(thisArg, layer)) {
      var layerRenderer = this.getLayerRenderer(layer);
      hasFeature =
          layerRenderer.hasFeatureAtCoordinate(coordinate, frameState);
      if (hasFeature) {
        return true;
      }
    }
  }
  return hasFeature;
};


/**
 * @inheritDoc
 */
ol.renderer.webgl.Map.prototype.forEachLayerAtPixel = function(pixel, frameState, callback, thisArg,
        layerFilter, thisArg2) {
  if (this.getGL().isContextLost()) {
    return false;
  }

  var viewState = frameState.viewState;
  var result;

  var layerStates = frameState.layerStatesArray;
  var numLayers = layerStates.length;
  var i;
  for (i = numLayers - 1; i >= 0; --i) {
    var layerState = layerStates[i];
    var layer = layerState.layer;
    if (ol.layer.Layer.visibleAtResolution(layerState, viewState.resolution) &&
        layerFilter.call(thisArg, layer)) {
      var layerRenderer = this.getLayerRenderer(layer);
      result = layerRenderer.forEachLayerAtPixel(
          pixel, frameState, callback, thisArg);
      if (result) {
        return result;
      }
    }
  }
  return undefined;
};

// FIXME recheck layer/map projection compatibility when projection changes
// FIXME layer renderers should skip when they can't reproject
// FIXME add tilt and height?

goog.provide('ol.Map');
goog.provide('ol.MapProperty');

goog.require('goog.async.nextTick');
goog.require('ol');
goog.require('ol.Collection');
goog.require('ol.MapBrowserEvent');
goog.require('ol.MapBrowserEvent.EventType');
goog.require('ol.MapBrowserEventHandler');
goog.require('ol.MapEvent');
goog.require('ol.MapEventType');
goog.require('ol.Object');
goog.require('ol.ObjectEventType');
goog.require('ol.RendererType');
goog.require('ol.TileQueue');
goog.require('ol.View');
goog.require('ol.array');
goog.require('ol.asserts');
goog.require('ol.control');
goog.require('ol.dom');
goog.require('ol.events');
goog.require('ol.events.Event');
goog.require('ol.events.EventType');
goog.require('ol.extent');
goog.require('ol.functions');
goog.require('ol.has');
goog.require('ol.interaction');
goog.require('ol.layer.Group');
goog.require('ol.obj');
goog.require('ol.proj.common');
goog.require('ol.renderer.Map');
goog.require('ol.renderer.canvas.Map');
goog.require('ol.renderer.dom.Map');
goog.require('ol.renderer.webgl.Map');
goog.require('ol.size');
goog.require('ol.structs.PriorityQueue');
goog.require('ol.transform');


/**
 * @const
 * @type {string}
 */
ol.OL3_URL = 'http://openlayers.org/';


/**
 * @const
 * @type {string}
 */
ol.OL3_LOGO_URL = 'data:image/png;base64,' +
    'iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAMAAABEpIrGAAAAA3NCSVQICAjb4U/gAAAACXBI' +
    'WXMAAAHGAAABxgEXwfpGAAAAGXRFWHRTb2Z0d2FyZQB3d3cuaW5rc2NhcGUub3Jnm+48GgAA' +
    'AhNQTFRF////AP//AICAgP//AFVVQECA////K1VVSbbbYL/fJ05idsTYJFtbbcjbJllmZszW' +
    'WMTOIFhoHlNiZszTa9DdUcHNHlNlV8XRIVdiasrUHlZjIVZjaMnVH1RlIFRkH1RkH1ZlasvY' +
    'asvXVsPQH1VkacnVa8vWIVZjIFRjVMPQa8rXIVVkXsXRsNveIFVkIFZlIVVj3eDeh6GmbMvX' +
    'H1ZkIFRka8rWbMvXIFVkIFVjIFVkbMvWH1VjbMvWIFVlbcvWIFVla8vVIFVkbMvWbMvVH1Vk' +
    'bMvWIFVlbcvWIFVkbcvVbMvWjNPbIFVkU8LPwMzNIFVkbczWIFVkbsvWbMvXIFVkRnB8bcvW' +
    '2+TkW8XRIFVkIlZlJVloJlpoKlxrLl9tMmJwOWd0Omh1RXF8TneCT3iDUHiDU8LPVMLPVcLP' +
    'VcPQVsPPVsPQV8PQWMTQWsTQW8TQXMXSXsXRX4SNX8bSYMfTYcfTYsfTY8jUZcfSZsnUaIqT' +
    'acrVasrVa8jTa8rWbI2VbMvWbcvWdJObdcvUdszUd8vVeJaee87Yfc3WgJyjhqGnitDYjaar' +
    'ldPZnrK2oNbborW5o9bbo9fbpLa6q9ndrL3ArtndscDDutzfu8fJwN7gwt7gxc/QyuHhy+Hi' +
    'zeHi0NfX0+Pj19zb1+Tj2uXk29/e3uLg3+Lh3+bl4uXj4ufl4+fl5Ofl5ufl5ujm5+jmySDn' +
    'BAAAAFp0Uk5TAAECAgMEBAYHCA0NDg4UGRogIiMmKSssLzU7PkJJT1JTVFliY2hrdHZ3foSF' +
    'hYeJjY2QkpugqbG1tre5w8zQ09XY3uXn6+zx8vT09vf4+Pj5+fr6/P39/f3+gz7SsAAAAVVJ' +
    'REFUOMtjYKA7EBDnwCPLrObS1BRiLoJLnte6CQy8FLHLCzs2QUG4FjZ5GbcmBDDjxJBXDWxC' +
    'Brb8aM4zbkIDzpLYnAcE9VXlJSWlZRU13koIeW57mGx5XjoMZEUqwxWYQaQbSzLSkYGfKFSe' +
    '0QMsX5WbjgY0YS4MBplemI4BdGBW+DQ11eZiymfqQuXZIjqwyadPNoSZ4L+0FVM6e+oGI6g8' +
    'a9iKNT3o8kVzNkzRg5lgl7p4wyRUL9Yt2jAxVh6mQCogae6GmflI8p0r13VFWTHBQ0rWPW7a' +
    'hgWVcPm+9cuLoyy4kCJDzCm6d8PSFoh0zvQNC5OjDJhQopPPJqph1doJBUD5tnkbZiUEqaCn' +
    'B3bTqLTFG1bPn71kw4b+GFdpLElKIzRxxgYgWNYc5SCENVHKeUaltHdXx0dZ8uBI1hJ2UUDg' +
    'q82CM2MwKeibqAvSO7MCABq0wXEPiqWEAAAAAElFTkSuQmCC';


/**
 * @type {Array.<ol.RendererType>}
 * @const
 */
ol.DEFAULT_RENDERER_TYPES = [
  ol.RendererType.CANVAS,
  ol.RendererType.WEBGL,
  ol.RendererType.DOM
];


/**
 * @enum {string}
 */
ol.MapProperty = {
  LAYERGROUP: 'layergroup',
  SIZE: 'size',
  TARGET: 'target',
  VIEW: 'view'
};


/**
 * @classdesc
 * The map is the core component of OpenLayers. For a map to render, a view,
 * one or more layers, and a target container are needed:
 *
 *     var map = new ol.Map({
 *       view: new ol.View({
 *         center: [0, 0],
 *         zoom: 1
 *       }),
 *       layers: [
 *         new ol.layer.Tile({
 *           source: new ol.source.OSM()
 *         })
 *       ],
 *       target: 'map'
 *     });
 *
 * The above snippet creates a map using a {@link ol.layer.Tile} to display
 * {@link ol.source.OSM} OSM data and render it to a DOM element with the
 * id `map`.
 *
 * The constructor places a viewport container (with CSS class name
 * `ol-viewport`) in the target element (see `getViewport()`), and then two
 * further elements within the viewport: one with CSS class name
 * `ol-overlaycontainer-stopevent` for controls and some overlays, and one with
 * CSS class name `ol-overlaycontainer` for other overlays (see the `stopEvent`
 * option of {@link ol.Overlay} for the difference). The map itself is placed in
 * a further element within the viewport, either DOM or Canvas, depending on the
 * renderer.
 *
 * Layers are stored as a `ol.Collection` in layerGroups. A top-level group is
 * provided by the library. This is what is accessed by `getLayerGroup` and
 * `setLayerGroup`. Layers entered in the options are added to this group, and
 * `addLayer` and `removeLayer` change the layer collection in the group.
 * `getLayers` is a convenience function for `getLayerGroup().getLayers()`.
 * Note that `ol.layer.Group` is a subclass of `ol.layer.Base`, so layers
 * entered in the options or added with `addLayer` can be groups, which can
 * contain further groups, and so on.
 *
 * @constructor
 * @extends {ol.Object}
 * @param {olx.MapOptions} options Map options.
 * @fires ol.MapBrowserEvent
 * @fires ol.MapEvent
 * @fires ol.render.Event#postcompose
 * @fires ol.render.Event#precompose
 * @api stable
 */
ol.Map = function(options) {

  ol.Object.call(this);

  var optionsInternal = ol.Map.createOptionsInternal(options);

  /**
   * @type {boolean}
   * @private
   */
  this.loadTilesWhileAnimating_ =
      options.loadTilesWhileAnimating !== undefined ?
          options.loadTilesWhileAnimating : false;

  /**
   * @type {boolean}
   * @private
   */
  this.loadTilesWhileInteracting_ =
      options.loadTilesWhileInteracting !== undefined ?
          options.loadTilesWhileInteracting : false;

  /**
   * @private
   * @type {number}
   */
  this.pixelRatio_ = options.pixelRatio !== undefined ?
      options.pixelRatio : ol.has.DEVICE_PIXEL_RATIO;

  /**
   * @private
   * @type {Object.<string, string>}
   */
  this.logos_ = optionsInternal.logos;

  /**
   * @private
   * @type {number|undefined}
   */
  this.animationDelayKey_;

  /**
   * @private
   */
  this.animationDelay_ = function() {
    this.animationDelayKey_ = undefined;
    this.renderFrame_.call(this, Date.now());
  }.bind(this);

  /**
   * @private
   * @type {ol.Transform}
   */
  this.coordinateToPixelTransform_ = ol.transform.create();

  /**
   * @private
   * @type {ol.Transform}
   */
  this.pixelToCoordinateTransform_ = ol.transform.create();

  /**
   * @private
   * @type {number}
   */
  this.frameIndex_ = 0;

  /**
   * @private
   * @type {?olx.FrameState}
   */
  this.frameState_ = null;

  /**
   * The extent at the previous 'moveend' event.
   * @private
   * @type {ol.Extent}
   */
  this.previousExtent_ = ol.extent.createEmpty();

  /**
   * @private
   * @type {?ol.EventsKey}
   */
  this.viewPropertyListenerKey_ = null;

  /**
   * @private
   * @type {Array.<ol.EventsKey>}
   */
  this.layerGroupPropertyListenerKeys_ = null;

  /**
   * @private
   * @type {Element}
   */
  this.viewport_ = document.createElement('DIV');
  this.viewport_.className = 'ol-viewport' + (ol.has.TOUCH ? ' ol-touch' : '');
  this.viewport_.style.position = 'relative';
  this.viewport_.style.overflow = 'hidden';
  this.viewport_.style.width = '100%';
  this.viewport_.style.height = '100%';
  // prevent page zoom on IE >= 10 browsers
  this.viewport_.style.msTouchAction = 'none';
  this.viewport_.style.touchAction = 'none';

  /**
   * @private
   * @type {!Element}
   */
  this.overlayContainer_ = document.createElement('DIV');
  this.overlayContainer_.className = 'ol-overlaycontainer';
  this.viewport_.appendChild(this.overlayContainer_);

  /**
   * @private
   * @type {!Element}
   */
  this.overlayContainerStopEvent_ = document.createElement('DIV');
  this.overlayContainerStopEvent_.className = 'ol-overlaycontainer-stopevent';
  var overlayEvents = [
    ol.events.EventType.CLICK,
    ol.events.EventType.DBLCLICK,
    ol.events.EventType.MOUSEDOWN,
    ol.events.EventType.TOUCHSTART,
    ol.events.EventType.MSPOINTERDOWN,
    ol.MapBrowserEvent.EventType.POINTERDOWN,
    ol.events.EventType.MOUSEWHEEL,
    ol.events.EventType.WHEEL
  ];
  for (var i = 0, ii = overlayEvents.length; i < ii; ++i) {
    ol.events.listen(this.overlayContainerStopEvent_, overlayEvents[i],
        ol.events.Event.stopPropagation);
  }
  this.viewport_.appendChild(this.overlayContainerStopEvent_);

  /**
   * @private
   * @type {ol.MapBrowserEventHandler}
   */
  this.mapBrowserEventHandler_ = new ol.MapBrowserEventHandler(this);
  for (var key in ol.MapBrowserEvent.EventType) {
    ol.events.listen(this.mapBrowserEventHandler_, ol.MapBrowserEvent.EventType[key],
        this.handleMapBrowserEvent, this);
  }

  /**
   * @private
   * @type {Element|Document}
   */
  this.keyboardEventTarget_ = optionsInternal.keyboardEventTarget;

  /**
   * @private
   * @type {Array.<ol.EventsKey>}
   */
  this.keyHandlerKeys_ = null;

  ol.events.listen(this.viewport_, ol.events.EventType.WHEEL,
      this.handleBrowserEvent, this);
  ol.events.listen(this.viewport_, ol.events.EventType.MOUSEWHEEL,
      this.handleBrowserEvent, this);

  /**
   * @type {ol.Collection.<ol.control.Control>}
   * @private
   */
  this.controls_ = optionsInternal.controls;

  /**
   * @type {ol.Collection.<ol.interaction.Interaction>}
   * @private
   */
  this.interactions_ = optionsInternal.interactions;

  /**
   * @type {ol.Collection.<ol.Overlay>}
   * @private
   */
  this.overlays_ = optionsInternal.overlays;

  /**
   * A lookup of overlays by id.
   * @private
   * @type {Object.<string, ol.Overlay>}
   */
  this.overlayIdIndex_ = {};

  /**
   * @type {ol.renderer.Map}
   * @private
   */
  this.renderer_ = new optionsInternal.rendererConstructor(this.viewport_, this);

  /**
   * @type {function(Event)|undefined}
   * @private
   */
  this.handleResize_;

  /**
   * @private
   * @type {ol.Coordinate}
   */
  this.focus_ = null;

  /**
   * @private
   * @type {Array.<ol.PreRenderFunction>}
   */
  this.preRenderFunctions_ = [];

  /**
   * @private
   * @type {Array.<ol.PostRenderFunction>}
   */
  this.postRenderFunctions_ = [];

  /**
   * @private
   * @type {ol.TileQueue}
   */
  this.tileQueue_ = new ol.TileQueue(
      this.getTilePriority.bind(this),
      this.handleTileChange_.bind(this));

  /**
   * Uids of features to skip at rendering time.
   * @type {Object.<string, boolean>}
   * @private
   */
  this.skippedFeatureUids_ = {};

  ol.events.listen(
      this, ol.Object.getChangeEventType(ol.MapProperty.LAYERGROUP),
      this.handleLayerGroupChanged_, this);
  ol.events.listen(this, ol.Object.getChangeEventType(ol.MapProperty.VIEW),
      this.handleViewChanged_, this);
  ol.events.listen(this, ol.Object.getChangeEventType(ol.MapProperty.SIZE),
      this.handleSizeChanged_, this);
  ol.events.listen(this, ol.Object.getChangeEventType(ol.MapProperty.TARGET),
      this.handleTargetChanged_, this);

  // setProperties will trigger the rendering of the map if the map
  // is "defined" already.
  this.setProperties(optionsInternal.values);

  this.controls_.forEach(
      /**
       * @param {ol.control.Control} control Control.
       * @this {ol.Map}
       */
      function(control) {
        control.setMap(this);
      }, this);

  ol.events.listen(this.controls_, ol.Collection.EventType.ADD,
      /**
       * @param {ol.Collection.Event} event Collection event.
       */
      function(event) {
        event.element.setMap(this);
      }, this);

  ol.events.listen(this.controls_, ol.Collection.EventType.REMOVE,
      /**
       * @param {ol.Collection.Event} event Collection event.
       */
      function(event) {
        event.element.setMap(null);
      }, this);

  this.interactions_.forEach(
      /**
       * @param {ol.interaction.Interaction} interaction Interaction.
       * @this {ol.Map}
       */
      function(interaction) {
        interaction.setMap(this);
      }, this);

  ol.events.listen(this.interactions_, ol.Collection.EventType.ADD,
      /**
       * @param {ol.Collection.Event} event Collection event.
       */
      function(event) {
        event.element.setMap(this);
      }, this);

  ol.events.listen(this.interactions_, ol.Collection.EventType.REMOVE,
      /**
       * @param {ol.Collection.Event} event Collection event.
       */
      function(event) {
        event.element.setMap(null);
      }, this);

  this.overlays_.forEach(this.addOverlayInternal_, this);

  ol.events.listen(this.overlays_, ol.Collection.EventType.ADD,
      /**
       * @param {ol.Collection.Event} event Collection event.
       */
      function(event) {
        this.addOverlayInternal_(/** @type {ol.Overlay} */ (event.element));
      }, this);

  ol.events.listen(this.overlays_, ol.Collection.EventType.REMOVE,
      /**
       * @param {ol.Collection.Event} event Collection event.
       */
      function(event) {
        var id = event.element.getId();
        if (id !== undefined) {
          delete this.overlayIdIndex_[id.toString()];
        }
        event.element.setMap(null);
      }, this);

};
ol.inherits(ol.Map, ol.Object);


/**
 * Add the given control to the map.
 * @param {ol.control.Control} control Control.
 * @api stable
 */
ol.Map.prototype.addControl = function(control) {
  this.getControls().push(control);
};


/**
 * Add the given interaction to the map.
 * @param {ol.interaction.Interaction} interaction Interaction to add.
 * @api stable
 */
ol.Map.prototype.addInteraction = function(interaction) {
  this.getInteractions().push(interaction);
};


/**
 * Adds the given layer to the top of this map. If you want to add a layer
 * elsewhere in the stack, use `getLayers()` and the methods available on
 * {@link ol.Collection}.
 * @param {ol.layer.Base} layer Layer.
 * @api stable
 */
ol.Map.prototype.addLayer = function(layer) {
  var layers = this.getLayerGroup().getLayers();
  layers.push(layer);
};


/**
 * Add the given overlay to the map.
 * @param {ol.Overlay} overlay Overlay.
 * @api stable
 */
ol.Map.prototype.addOverlay = function(overlay) {
  this.getOverlays().push(overlay);
};


/**
 * This deals with map's overlay collection changes.
 * @param {ol.Overlay} overlay Overlay.
 * @private
 */
ol.Map.prototype.addOverlayInternal_ = function(overlay) {
  var id = overlay.getId();
  if (id !== undefined) {
    this.overlayIdIndex_[id.toString()] = overlay;
  }
  overlay.setMap(this);
};


/**
 * Add functions to be called before rendering. This can be used for attaching
 * animations before updating the map's view.  The {@link ol.animation}
 * namespace provides several static methods for creating prerender functions.
 * @param {...ol.PreRenderFunction} var_args Any number of pre-render functions.
 * @api
 */
ol.Map.prototype.beforeRender = function(var_args) {
  this.render();
  Array.prototype.push.apply(this.preRenderFunctions_, arguments);
};


/**
 * @param {ol.PreRenderFunction} preRenderFunction Pre-render function.
 * @return {boolean} Whether the preRenderFunction has been found and removed.
 */
ol.Map.prototype.removePreRenderFunction = function(preRenderFunction) {
  return ol.array.remove(this.preRenderFunctions_, preRenderFunction);
};


/**
 *
 * @inheritDoc
 */
ol.Map.prototype.disposeInternal = function() {
  this.mapBrowserEventHandler_.dispose();
  this.renderer_.dispose();
  ol.events.unlisten(this.viewport_, ol.events.EventType.WHEEL,
      this.handleBrowserEvent, this);
  ol.events.unlisten(this.viewport_, ol.events.EventType.MOUSEWHEEL,
      this.handleBrowserEvent, this);
  if (this.handleResize_ !== undefined) {
    ol.global.removeEventListener(ol.events.EventType.RESIZE,
        this.handleResize_, false);
    this.handleResize_ = undefined;
  }
  if (this.animationDelayKey_) {
    ol.global.cancelAnimationFrame(this.animationDelayKey_);
    this.animationDelayKey_ = undefined;
  }
  this.setTarget(null);
  ol.Object.prototype.disposeInternal.call(this);
};


/**
 * Detect features that intersect a pixel on the viewport, and execute a
 * callback with each intersecting feature. Layers included in the detection can
 * be configured through `opt_layerFilter`.
 * @param {ol.Pixel} pixel Pixel.
 * @param {function(this: S, (ol.Feature|ol.render.Feature),
 *     ol.layer.Layer): T} callback Feature callback. The callback will be
 *     called with two arguments. The first argument is one
 *     {@link ol.Feature feature} or
 *     {@link ol.render.Feature render feature} at the pixel, the second is
 *     the {@link ol.layer.Layer layer} of the feature and will be null for
 *     unmanaged layers. To stop detection, callback functions can return a
 *     truthy value.
 * @param {S=} opt_this Value to use as `this` when executing `callback`.
 * @param {(function(this: U, ol.layer.Layer): boolean)=} opt_layerFilter Layer
 *     filter function. The filter function will receive one argument, the
 *     {@link ol.layer.Layer layer-candidate} and it should return a boolean
 *     value. Only layers which are visible and for which this function returns
 *     `true` will be tested for features. By default, all visible layers will
 *     be tested.
 * @param {U=} opt_this2 Value to use as `this` when executing `layerFilter`.
 * @return {T|undefined} Callback result, i.e. the return value of last
 * callback execution, or the first truthy callback return value.
 * @template S,T,U
 * @api stable
 */
ol.Map.prototype.forEachFeatureAtPixel = function(pixel, callback, opt_this, opt_layerFilter, opt_this2) {
  if (!this.frameState_) {
    return;
  }
  var coordinate = this.getCoordinateFromPixel(pixel);
  var thisArg = opt_this !== undefined ? opt_this : null;
  var layerFilter = opt_layerFilter !== undefined ?
      opt_layerFilter : ol.functions.TRUE;
  var thisArg2 = opt_this2 !== undefined ? opt_this2 : null;
  return this.renderer_.forEachFeatureAtCoordinate(
      coordinate, this.frameState_, callback, thisArg,
      layerFilter, thisArg2);
};


/**
 * Detect layers that have a color value at a pixel on the viewport, and
 * execute a callback with each matching layer. Layers included in the
 * detection can be configured through `opt_layerFilter`.
 * @param {ol.Pixel} pixel Pixel.
 * @param {function(this: S, ol.layer.Layer, ol.Color): T} callback Layer
 *     callback. This callback will recieve two arguments: first is the
 *     {@link ol.layer.Layer layer}, second argument is {@link ol.Color}
 *     and will be null for layer types that do not currently support this
 *     argument. To stop detection callback functions can return a truthy value.
 * @param {S=} opt_this Value to use as `this` when executing `callback`.
 * @param {(function(this: U, ol.layer.Layer): boolean)=} opt_layerFilter Layer
 *     filter function. The filter function will receive one argument, the
 *     {@link ol.layer.Layer layer-candidate} and it should return a boolean
 *     value. Only layers which are visible and for which this function returns
 *     `true` will be tested for features. By default, all visible layers will
 *     be tested.
 * @param {U=} opt_this2 Value to use as `this` when executing `layerFilter`.
 * @return {T|undefined} Callback result, i.e. the return value of last
 * callback execution, or the first truthy callback return value.
 * @template S,T,U
 * @api stable
 */
ol.Map.prototype.forEachLayerAtPixel = function(pixel, callback, opt_this, opt_layerFilter, opt_this2) {
  if (!this.frameState_) {
    return;
  }
  var thisArg = opt_this !== undefined ? opt_this : null;
  var layerFilter = opt_layerFilter !== undefined ?
      opt_layerFilter : ol.functions.TRUE;
  var thisArg2 = opt_this2 !== undefined ? opt_this2 : null;
  return this.renderer_.forEachLayerAtPixel(
      pixel, this.frameState_, callback, thisArg,
      layerFilter, thisArg2);
};


/**
 * Detect if features intersect a pixel on the viewport. Layers included in the
 * detection can be configured through `opt_layerFilter`.
 * @param {ol.Pixel} pixel Pixel.
 * @param {(function(this: U, ol.layer.Layer): boolean)=} opt_layerFilter Layer
 *     filter function. The filter function will receive one argument, the
 *     {@link ol.layer.Layer layer-candidate} and it should return a boolean
 *     value. Only layers which are visible and for which this function returns
 *     `true` will be tested for features. By default, all visible layers will
 *     be tested.
 * @param {U=} opt_this Value to use as `this` when executing `layerFilter`.
 * @return {boolean} Is there a feature at the given pixel?
 * @template U
 * @api
 */
ol.Map.prototype.hasFeatureAtPixel = function(pixel, opt_layerFilter, opt_this) {
  if (!this.frameState_) {
    return false;
  }
  var coordinate = this.getCoordinateFromPixel(pixel);
  var layerFilter = opt_layerFilter !== undefined ?
      opt_layerFilter : ol.functions.TRUE;
  var thisArg = opt_this !== undefined ? opt_this : null;
  return this.renderer_.hasFeatureAtCoordinate(
      coordinate, this.frameState_, layerFilter, thisArg);
};


/**
 * Returns the geographical coordinate for a browser event.
 * @param {Event} event Event.
 * @return {ol.Coordinate} Coordinate.
 * @api stable
 */
ol.Map.prototype.getEventCoordinate = function(event) {
  return this.getCoordinateFromPixel(this.getEventPixel(event));
};


/**
 * Returns the map pixel position for a browser event relative to the viewport.
 * @param {Event} event Event.
 * @return {ol.Pixel} Pixel.
 * @api stable
 */
ol.Map.prototype.getEventPixel = function(event) {
  var viewportPosition = this.viewport_.getBoundingClientRect();
  var eventPosition = event.changedTouches ? event.changedTouches[0] : event;
  return [
    eventPosition.clientX - viewportPosition.left,
    eventPosition.clientY - viewportPosition.top
  ];
};


/**
 * Get the target in which this map is rendered.
 * Note that this returns what is entered as an option or in setTarget:
 * if that was an element, it returns an element; if a string, it returns that.
 * @return {Element|string|undefined} The Element or id of the Element that the
 *     map is rendered in.
 * @observable
 * @api stable
 */
ol.Map.prototype.getTarget = function() {
  return /** @type {Element|string|undefined} */ (
      this.get(ol.MapProperty.TARGET));
};


/**
 * Get the DOM element into which this map is rendered. In contrast to
 * `getTarget` this method always return an `Element`, or `null` if the
 * map has no target.
 * @return {Element} The element that the map is rendered in.
 * @api
 */
ol.Map.prototype.getTargetElement = function() {
  var target = this.getTarget();
  if (target !== undefined) {
    return typeof target === 'string' ?
      document.getElementById(target) :
      target;
  } else {
    return null;
  }
};


/**
 * Get the coordinate for a given pixel.  This returns a coordinate in the
 * map view projection.
 * @param {ol.Pixel} pixel Pixel position in the map viewport.
 * @return {ol.Coordinate} The coordinate for the pixel position.
 * @api stable
 */
ol.Map.prototype.getCoordinateFromPixel = function(pixel) {
  var frameState = this.frameState_;
  if (!frameState) {
    return null;
  } else {
    return ol.transform.apply(frameState.pixelToCoordinateTransform, pixel.slice());
  }
};


/**
 * Get the map controls. Modifying this collection changes the controls
 * associated with the map.
 * @return {ol.Collection.<ol.control.Control>} Controls.
 * @api stable
 */
ol.Map.prototype.getControls = function() {
  return this.controls_;
};


/**
 * Get the map overlays. Modifying this collection changes the overlays
 * associated with the map.
 * @return {ol.Collection.<ol.Overlay>} Overlays.
 * @api stable
 */
ol.Map.prototype.getOverlays = function() {
  return this.overlays_;
};


/**
 * Get an overlay by its identifier (the value returned by overlay.getId()).
 * Note that the index treats string and numeric identifiers as the same. So
 * `map.getOverlayById(2)` will return an overlay with id `'2'` or `2`.
 * @param {string|number} id Overlay identifier.
 * @return {ol.Overlay} Overlay.
 * @api
 */
ol.Map.prototype.getOverlayById = function(id) {
  var overlay = this.overlayIdIndex_[id.toString()];
  return overlay !== undefined ? overlay : null;
};


/**
 * Get the map interactions. Modifying this collection changes the interactions
 * associated with the map.
 *
 * Interactions are used for e.g. pan, zoom and rotate.
 * @return {ol.Collection.<ol.interaction.Interaction>} Interactions.
 * @api stable
 */
ol.Map.prototype.getInteractions = function() {
  return this.interactions_;
};


/**
 * Get the layergroup associated with this map.
 * @return {ol.layer.Group} A layer group containing the layers in this map.
 * @observable
 * @api stable
 */
ol.Map.prototype.getLayerGroup = function() {
  return /** @type {ol.layer.Group} */ (this.get(ol.MapProperty.LAYERGROUP));
};


/**
 * Get the collection of layers associated with this map.
 * @return {!ol.Collection.<ol.layer.Base>} Layers.
 * @api stable
 */
ol.Map.prototype.getLayers = function() {
  var layers = this.getLayerGroup().getLayers();
  return layers;
};


/**
 * Get the pixel for a coordinate.  This takes a coordinate in the map view
 * projection and returns the corresponding pixel.
 * @param {ol.Coordinate} coordinate A map coordinate.
 * @return {ol.Pixel} A pixel position in the map viewport.
 * @api stable
 */
ol.Map.prototype.getPixelFromCoordinate = function(coordinate) {
  var frameState = this.frameState_;
  if (!frameState) {
    return null;
  } else {
    return ol.transform.apply(frameState.coordinateToPixelTransform,
        coordinate.slice(0, 2));
  }
};


/**
 * Get the map renderer.
 * @return {ol.renderer.Map} Renderer
 */
ol.Map.prototype.getRenderer = function() {
  return this.renderer_;
};


/**
 * Get the size of this map.
 * @return {ol.Size|undefined} The size in pixels of the map in the DOM.
 * @observable
 * @api stable
 */
ol.Map.prototype.getSize = function() {
  return /** @type {ol.Size|undefined} */ (this.get(ol.MapProperty.SIZE));
};


/**
 * Get the view associated with this map. A view manages properties such as
 * center and resolution.
 * @return {ol.View} The view that controls this map.
 * @observable
 * @api stable
 */
ol.Map.prototype.getView = function() {
  return /** @type {ol.View} */ (this.get(ol.MapProperty.VIEW));
};


/**
 * Get the element that serves as the map viewport.
 * @return {Element} Viewport.
 * @api stable
 */
ol.Map.prototype.getViewport = function() {
  return this.viewport_;
};


/**
 * Get the element that serves as the container for overlays.  Elements added to
 * this container will let mousedown and touchstart events through to the map,
 * so clicks and gestures on an overlay will trigger {@link ol.MapBrowserEvent}
 * events.
 * @return {!Element} The map's overlay container.
 */
ol.Map.prototype.getOverlayContainer = function() {
  return this.overlayContainer_;
};


/**
 * Get the element that serves as a container for overlays that don't allow
 * event propagation. Elements added to this container won't let mousedown and
 * touchstart events through to the map, so clicks and gestures on an overlay
 * don't trigger any {@link ol.MapBrowserEvent}.
 * @return {!Element} The map's overlay container that stops events.
 */
ol.Map.prototype.getOverlayContainerStopEvent = function() {
  return this.overlayContainerStopEvent_;
};


/**
 * @param {ol.Tile} tile Tile.
 * @param {string} tileSourceKey Tile source key.
 * @param {ol.Coordinate} tileCenter Tile center.
 * @param {number} tileResolution Tile resolution.
 * @return {number} Tile priority.
 */
ol.Map.prototype.getTilePriority = function(tile, tileSourceKey, tileCenter, tileResolution) {
  // Filter out tiles at higher zoom levels than the current zoom level, or that
  // are outside the visible extent.
  var frameState = this.frameState_;
  if (!frameState || !(tileSourceKey in frameState.wantedTiles)) {
    return ol.structs.PriorityQueue.DROP;
  }
  if (!frameState.wantedTiles[tileSourceKey][tile.getKey()]) {
    return ol.structs.PriorityQueue.DROP;
  }
  // Prioritize the highest zoom level tiles closest to the focus.
  // Tiles at higher zoom levels are prioritized using Math.log(tileResolution).
  // Within a zoom level, tiles are prioritized by the distance in pixels
  // between the center of the tile and the focus.  The factor of 65536 means
  // that the prioritization should behave as desired for tiles up to
  // 65536 * Math.log(2) = 45426 pixels from the focus.
  var deltaX = tileCenter[0] - frameState.focus[0];
  var deltaY = tileCenter[1] - frameState.focus[1];
  return 65536 * Math.log(tileResolution) +
      Math.sqrt(deltaX * deltaX + deltaY * deltaY) / tileResolution;
};


/**
 * @param {Event} browserEvent Browser event.
 * @param {string=} opt_type Type.
 */
ol.Map.prototype.handleBrowserEvent = function(browserEvent, opt_type) {
  var type = opt_type || browserEvent.type;
  var mapBrowserEvent = new ol.MapBrowserEvent(type, this, browserEvent);
  this.handleMapBrowserEvent(mapBrowserEvent);
};


/**
 * @param {ol.MapBrowserEvent} mapBrowserEvent The event to handle.
 */
ol.Map.prototype.handleMapBrowserEvent = function(mapBrowserEvent) {
  if (!this.frameState_) {
    // With no view defined, we cannot translate pixels into geographical
    // coordinates so interactions cannot be used.
    return;
  }
  this.focus_ = mapBrowserEvent.coordinate;
  mapBrowserEvent.frameState = this.frameState_;
  var interactionsArray = this.getInteractions().getArray();
  var i;
  if (this.dispatchEvent(mapBrowserEvent) !== false) {
    for (i = interactionsArray.length - 1; i >= 0; i--) {
      var interaction = interactionsArray[i];
      if (!interaction.getActive()) {
        continue;
      }
      var cont = interaction.handleEvent(mapBrowserEvent);
      if (!cont) {
        break;
      }
    }
  }
};


/**
 * @protected
 */
ol.Map.prototype.handlePostRender = function() {

  var frameState = this.frameState_;

  // Manage the tile queue
  // Image loads are expensive and a limited resource, so try to use them
  // efficiently:
  // * When the view is static we allow a large number of parallel tile loads
  //   to complete the frame as quickly as possible.
  // * When animating or interacting, image loads can cause janks, so we reduce
  //   the maximum number of loads per frame and limit the number of parallel
  //   tile loads to remain reactive to view changes and to reduce the chance of
  //   loading tiles that will quickly disappear from view.
  var tileQueue = this.tileQueue_;
  if (!tileQueue.isEmpty()) {
    var maxTotalLoading = 16;
    var maxNewLoads = maxTotalLoading;
    if (frameState) {
      var hints = frameState.viewHints;
      if (hints[ol.View.Hint.ANIMATING]) {
        maxTotalLoading = this.loadTilesWhileAnimating_ ? 8 : 0;
        maxNewLoads = 2;
      }
      if (hints[ol.View.Hint.INTERACTING]) {
        maxTotalLoading = this.loadTilesWhileInteracting_ ? 8 : 0;
        maxNewLoads = 2;
      }
    }
    if (tileQueue.getTilesLoading() < maxTotalLoading) {
      tileQueue.reprioritize(); // FIXME only call if view has changed
      tileQueue.loadMoreTiles(maxTotalLoading, maxNewLoads);
    }
  }

  var postRenderFunctions = this.postRenderFunctions_;
  var i, ii;
  for (i = 0, ii = postRenderFunctions.length; i < ii; ++i) {
    postRenderFunctions[i](this, frameState);
  }
  postRenderFunctions.length = 0;
};


/**
 * @private
 */
ol.Map.prototype.handleSizeChanged_ = function() {
  this.render();
};


/**
 * @private
 */
ol.Map.prototype.handleTargetChanged_ = function() {
  // target may be undefined, null, a string or an Element.
  // If it's a string we convert it to an Element before proceeding.
  // If it's not now an Element we remove the viewport from the DOM.
  // If it's an Element we append the viewport element to it.

  var targetElement;
  if (this.getTarget()) {
    targetElement = this.getTargetElement();
    goog.DEBUG && console.assert(targetElement !== null,
        'expects a non-null value for targetElement');
  }

  if (this.keyHandlerKeys_) {
    for (var i = 0, ii = this.keyHandlerKeys_.length; i < ii; ++i) {
      ol.events.unlistenByKey(this.keyHandlerKeys_[i]);
    }
    this.keyHandlerKeys_ = null;
  }

  if (!targetElement) {
    ol.dom.removeNode(this.viewport_);
    if (this.handleResize_ !== undefined) {
      ol.global.removeEventListener(ol.events.EventType.RESIZE,
          this.handleResize_, false);
      this.handleResize_ = undefined;
    }
  } else {
    targetElement.appendChild(this.viewport_);

    var keyboardEventTarget = !this.keyboardEventTarget_ ?
        targetElement : this.keyboardEventTarget_;
    this.keyHandlerKeys_ = [
      ol.events.listen(keyboardEventTarget, ol.events.EventType.KEYDOWN,
          this.handleBrowserEvent, this),
      ol.events.listen(keyboardEventTarget, ol.events.EventType.KEYPRESS,
          this.handleBrowserEvent, this)
    ];

    if (!this.handleResize_) {
      this.handleResize_ = this.updateSize.bind(this);
      ol.global.addEventListener(ol.events.EventType.RESIZE,
          this.handleResize_, false);
    }
  }

  this.updateSize();
  // updateSize calls setSize, so no need to call this.render
  // ourselves here.
};


/**
 * @private
 */
ol.Map.prototype.handleTileChange_ = function() {
  this.render();
};


/**
 * @private
 */
ol.Map.prototype.handleViewPropertyChanged_ = function() {
  this.render();
};


/**
 * @private
 */
ol.Map.prototype.handleViewChanged_ = function() {
  if (this.viewPropertyListenerKey_) {
    ol.events.unlistenByKey(this.viewPropertyListenerKey_);
    this.viewPropertyListenerKey_ = null;
  }
  var view = this.getView();
  if (view) {
    this.viewPropertyListenerKey_ = ol.events.listen(
        view, ol.ObjectEventType.PROPERTYCHANGE,
        this.handleViewPropertyChanged_, this);
  }
  this.render();
};


/**
 * @private
 */
ol.Map.prototype.handleLayerGroupChanged_ = function() {
  if (this.layerGroupPropertyListenerKeys_) {
    this.layerGroupPropertyListenerKeys_.forEach(ol.events.unlistenByKey);
    this.layerGroupPropertyListenerKeys_ = null;
  }
  var layerGroup = this.getLayerGroup();
  if (layerGroup) {
    this.layerGroupPropertyListenerKeys_ = [
      ol.events.listen(
          layerGroup, ol.ObjectEventType.PROPERTYCHANGE,
          this.render, this),
      ol.events.listen(
          layerGroup, ol.events.EventType.CHANGE,
          this.render, this)
    ];
  }
  this.render();
};


/**
 * @return {boolean} Is rendered.
 */
ol.Map.prototype.isRendered = function() {
  return !!this.frameState_;
};


/**
 * Requests an immediate render in a synchronous manner.
 * @api stable
 */
ol.Map.prototype.renderSync = function() {
  if (this.animationDelayKey_) {
    ol.global.cancelAnimationFrame(this.animationDelayKey_);
  }
  this.animationDelay_();
};


/**
 * Request a map rendering (at the next animation frame).
 * @api stable
 */
ol.Map.prototype.render = function() {
  if (this.animationDelayKey_ === undefined) {
    this.animationDelayKey_ = ol.global.requestAnimationFrame(
        this.animationDelay_);
  }
};


/**
 * Remove the given control from the map.
 * @param {ol.control.Control} control Control.
 * @return {ol.control.Control|undefined} The removed control (or undefined
 *     if the control was not found).
 * @api stable
 */
ol.Map.prototype.removeControl = function(control) {
  return this.getControls().remove(control);
};


/**
 * Remove the given interaction from the map.
 * @param {ol.interaction.Interaction} interaction Interaction to remove.
 * @return {ol.interaction.Interaction|undefined} The removed interaction (or
 *     undefined if the interaction was not found).
 * @api stable
 */
ol.Map.prototype.removeInteraction = function(interaction) {
  return this.getInteractions().remove(interaction);
};


/**
 * Removes the given layer from the map.
 * @param {ol.layer.Base} layer Layer.
 * @return {ol.layer.Base|undefined} The removed layer (or undefined if the
 *     layer was not found).
 * @api stable
 */
ol.Map.prototype.removeLayer = function(layer) {
  var layers = this.getLayerGroup().getLayers();
  return layers.remove(layer);
};


/**
 * Remove the given overlay from the map.
 * @param {ol.Overlay} overlay Overlay.
 * @return {ol.Overlay|undefined} The removed overlay (or undefined
 *     if the overlay was not found).
 * @api stable
 */
ol.Map.prototype.removeOverlay = function(overlay) {
  return this.getOverlays().remove(overlay);
};


/**
 * @param {number} time Time.
 * @private
 */
ol.Map.prototype.renderFrame_ = function(time) {

  var i, ii, viewState;

  var size = this.getSize();
  var view = this.getView();
  var extent = ol.extent.createEmpty();
  /** @type {?olx.FrameState} */
  var frameState = null;
  if (size !== undefined && ol.size.hasArea(size) && view && view.isDef()) {
    var viewHints = view.getHints(this.frameState_ ? this.frameState_.viewHints : undefined);
    var layerStatesArray = this.getLayerGroup().getLayerStatesArray();
    var layerStates = {};
    for (i = 0, ii = layerStatesArray.length; i < ii; ++i) {
      layerStates[ol.getUid(layerStatesArray[i].layer)] = layerStatesArray[i];
    }
    viewState = view.getState();
    frameState = /** @type {olx.FrameState} */ ({
      animate: false,
      attributions: {},
      coordinateToPixelTransform: this.coordinateToPixelTransform_,
      extent: extent,
      focus: !this.focus_ ? viewState.center : this.focus_,
      index: this.frameIndex_++,
      layerStates: layerStates,
      layerStatesArray: layerStatesArray,
      logos: ol.obj.assign({}, this.logos_),
      pixelRatio: this.pixelRatio_,
      pixelToCoordinateTransform: this.pixelToCoordinateTransform_,
      postRenderFunctions: [],
      size: size,
      skippedFeatureUids: this.skippedFeatureUids_,
      tileQueue: this.tileQueue_,
      time: time,
      usedTiles: {},
      viewState: viewState,
      viewHints: viewHints,
      wantedTiles: {}
    });
  }

  if (frameState) {
    var preRenderFunctions = this.preRenderFunctions_;
    var n = 0, preRenderFunction;
    for (i = 0, ii = preRenderFunctions.length; i < ii; ++i) {
      preRenderFunction = preRenderFunctions[i];
      if (preRenderFunction(this, frameState)) {
        preRenderFunctions[n++] = preRenderFunction;
      }
    }
    preRenderFunctions.length = n;

    frameState.extent = ol.extent.getForViewAndSize(viewState.center,
        viewState.resolution, viewState.rotation, frameState.size, extent);
  }

  this.frameState_ = frameState;
  this.renderer_.renderFrame(frameState);

  if (frameState) {
    if (frameState.animate) {
      this.render();
    }
    Array.prototype.push.apply(
        this.postRenderFunctions_, frameState.postRenderFunctions);

    var idle = this.preRenderFunctions_.length === 0 &&
        !frameState.viewHints[ol.View.Hint.ANIMATING] &&
        !frameState.viewHints[ol.View.Hint.INTERACTING] &&
        !ol.extent.equals(frameState.extent, this.previousExtent_);

    if (idle) {
      this.dispatchEvent(
          new ol.MapEvent(ol.MapEventType.MOVEEND, this, frameState));
      ol.extent.clone(frameState.extent, this.previousExtent_);
    }
  }

  this.dispatchEvent(
      new ol.MapEvent(ol.MapEventType.POSTRENDER, this, frameState));

  goog.async.nextTick(this.handlePostRender, this);

};


/**
 * Sets the layergroup of this map.
 * @param {ol.layer.Group} layerGroup A layer group containing the layers in
 *     this map.
 * @observable
 * @api stable
 */
ol.Map.prototype.setLayerGroup = function(layerGroup) {
  this.set(ol.MapProperty.LAYERGROUP, layerGroup);
};


/**
 * Set the size of this map.
 * @param {ol.Size|undefined} size The size in pixels of the map in the DOM.
 * @observable
 * @api
 */
ol.Map.prototype.setSize = function(size) {
  this.set(ol.MapProperty.SIZE, size);
};


/**
 * Set the target element to render this map into.
 * @param {Element|string|undefined} target The Element or id of the Element
 *     that the map is rendered in.
 * @observable
 * @api stable
 */
ol.Map.prototype.setTarget = function(target) {
  this.set(ol.MapProperty.TARGET, target);
};


/**
 * Set the view for this map.
 * @param {ol.View} view The view that controls this map.
 * @observable
 * @api stable
 */
ol.Map.prototype.setView = function(view) {
  this.set(ol.MapProperty.VIEW, view);
};


/**
 * @param {ol.Feature} feature Feature.
 */
ol.Map.prototype.skipFeature = function(feature) {
  var featureUid = ol.getUid(feature).toString();
  this.skippedFeatureUids_[featureUid] = true;
  this.render();
};


/**
 * Force a recalculation of the map viewport size.  This should be called when
 * third-party code changes the size of the map viewport.
 * @api stable
 */
ol.Map.prototype.updateSize = function() {
  var targetElement = this.getTargetElement();

  if (!targetElement) {
    this.setSize(undefined);
  } else {
    var computedStyle = ol.global.getComputedStyle(targetElement);
    this.setSize([
      targetElement.offsetWidth -
          parseFloat(computedStyle['borderLeftWidth']) -
          parseFloat(computedStyle['paddingLeft']) -
          parseFloat(computedStyle['paddingRight']) -
          parseFloat(computedStyle['borderRightWidth']),
      targetElement.offsetHeight -
          parseFloat(computedStyle['borderTopWidth']) -
          parseFloat(computedStyle['paddingTop']) -
          parseFloat(computedStyle['paddingBottom']) -
          parseFloat(computedStyle['borderBottomWidth'])
    ]);
  }
};


/**
 * @param {ol.Feature} feature Feature.
 */
ol.Map.prototype.unskipFeature = function(feature) {
  var featureUid = ol.getUid(feature).toString();
  delete this.skippedFeatureUids_[featureUid];
  this.render();
};


/**
 * @param {olx.MapOptions} options Map options.
 * @return {ol.MapOptionsInternal} Internal map options.
 */
ol.Map.createOptionsInternal = function(options) {

  /**
   * @type {Element|Document}
   */
  var keyboardEventTarget = null;
  if (options.keyboardEventTarget !== undefined) {
    keyboardEventTarget = typeof options.keyboardEventTarget === 'string' ?
        document.getElementById(options.keyboardEventTarget) :
        options.keyboardEventTarget;
  }

  /**
   * @type {Object.<string, *>}
   */
  var values = {};

  var logos = {};
  if (options.logo === undefined ||
      (typeof options.logo === 'boolean' && options.logo)) {
    logos[ol.OL3_LOGO_URL] = ol.OL3_URL;
  } else {
    var logo = options.logo;
    if (typeof logo === 'string') {
      logos[logo] = '';
    } else if (logo instanceof HTMLElement) {
      logos[ol.getUid(logo).toString()] = logo;
    } else if (logo) {
      ol.asserts.assert(typeof logo.href == 'string', 44); // `logo.href` should be a string.
      ol.asserts.assert(typeof logo.src == 'string', 45); // `logo.src` should be a string.
      logos[logo.src] = logo.href;
    }
  }

  var layerGroup = (options.layers instanceof ol.layer.Group) ?
      options.layers : new ol.layer.Group({layers: options.layers});
  values[ol.MapProperty.LAYERGROUP] = layerGroup;

  values[ol.MapProperty.TARGET] = options.target;

  values[ol.MapProperty.VIEW] = options.view !== undefined ?
      options.view : new ol.View();

  /**
   * @type {function(new: ol.renderer.Map, Element, ol.Map)}
   */
  var rendererConstructor = ol.renderer.Map;

  /**
   * @type {Array.<ol.RendererType>}
   */
  var rendererTypes;
  if (options.renderer !== undefined) {
    if (Array.isArray(options.renderer)) {
      rendererTypes = options.renderer;
    } else if (typeof options.renderer === 'string') {
      rendererTypes = [options.renderer];
    } else {
      ol.asserts.assert(false, 46); // Incorrect format for `renderer` option
    }
  } else {
    rendererTypes = ol.DEFAULT_RENDERER_TYPES;
  }

  var i, ii;
  for (i = 0, ii = rendererTypes.length; i < ii; ++i) {
    /** @type {ol.RendererType} */
    var rendererType = rendererTypes[i];
    if (ol.ENABLE_CANVAS && rendererType == ol.RendererType.CANVAS) {
      if (ol.has.CANVAS) {
        rendererConstructor = ol.renderer.canvas.Map;
        break;
      }
    } else if (ol.ENABLE_DOM && rendererType == ol.RendererType.DOM) {
      if (ol.has.DOM) {
        rendererConstructor = ol.renderer.dom.Map;
        break;
      }
    } else if (ol.ENABLE_WEBGL && rendererType == ol.RendererType.WEBGL) {
      if (ol.has.WEBGL) {
        rendererConstructor = ol.renderer.webgl.Map;
        break;
      }
    }
  }

  var controls;
  if (options.controls !== undefined) {
    if (Array.isArray(options.controls)) {
      controls = new ol.Collection(options.controls.slice());
    } else {
      ol.asserts.assert(options.controls instanceof ol.Collection,
          47); // Expected `controls` to be an array or an `ol.Collection`
      controls = options.controls;
    }
  } else {
    controls = ol.control.defaults();
  }

  var interactions;
  if (options.interactions !== undefined) {
    if (Array.isArray(options.interactions)) {
      interactions = new ol.Collection(options.interactions.slice());
    } else {
      ol.asserts.assert(options.interactions instanceof ol.Collection,
          48); // Expected `interactions` to be an array or an `ol.Collection`
      interactions = options.interactions;
    }
  } else {
    interactions = ol.interaction.defaults();
  }

  var overlays;
  if (options.overlays !== undefined) {
    if (Array.isArray(options.overlays)) {
      overlays = new ol.Collection(options.overlays.slice());
    } else {
      ol.asserts.assert(options.overlays instanceof ol.Collection,
          49); // Expected `overlays` to be an array or an `ol.Collection`
      overlays = options.overlays;
    }
  } else {
    overlays = new ol.Collection();
  }

  return {
    controls: controls,
    interactions: interactions,
    keyboardEventTarget: keyboardEventTarget,
    logos: logos,
    overlays: overlays,
    rendererConstructor: rendererConstructor,
    values: values
  };

};


ol.proj.common.add();

goog.provide('ol.Overlay');
goog.provide('ol.OverlayPositioning');

goog.require('ol');
goog.require('ol.events');
goog.require('ol.MapEventType');
goog.require('ol.Object');
goog.require('ol.animation');
goog.require('ol.dom');
goog.require('ol.extent');


/**
 * @enum {string}
 */
ol.OverlayProperty = {
  ELEMENT: 'element',
  MAP: 'map',
  OFFSET: 'offset',
  POSITION: 'position',
  POSITIONING: 'positioning'
};


/**
 * Overlay position: `'bottom-left'`, `'bottom-center'`,  `'bottom-right'`,
 * `'center-left'`, `'center-center'`, `'center-right'`, `'top-left'`,
 * `'top-center'`, `'top-right'`
 * @enum {string}
 */
ol.OverlayPositioning = {
  BOTTOM_LEFT: 'bottom-left',
  BOTTOM_CENTER: 'bottom-center',
  BOTTOM_RIGHT: 'bottom-right',
  CENTER_LEFT: 'center-left',
  CENTER_CENTER: 'center-center',
  CENTER_RIGHT: 'center-right',
  TOP_LEFT: 'top-left',
  TOP_CENTER: 'top-center',
  TOP_RIGHT: 'top-right'
};


/**
 * @classdesc
 * An element to be displayed over the map and attached to a single map
 * location.  Like {@link ol.control.Control}, Overlays are visible widgets.
 * Unlike Controls, they are not in a fixed position on the screen, but are tied
 * to a geographical coordinate, so panning the map will move an Overlay but not
 * a Control.
 *
 * Example:
 *
 *     var popup = new ol.Overlay({
 *       element: document.getElementById('popup')
 *     });
 *     popup.setPosition(coordinate);
 *     map.addOverlay(popup);
 *
 * @constructor
 * @extends {ol.Object}
 * @param {olx.OverlayOptions} options Overlay options.
 * @api stable
 */
ol.Overlay = function(options) {

  ol.Object.call(this);

  /**
   * @private
   * @type {number|string|undefined}
   */
  this.id_ = options.id;

  /**
   * @private
   * @type {boolean}
   */
  this.insertFirst_ = options.insertFirst !== undefined ?
      options.insertFirst : true;

  /**
   * @private
   * @type {boolean}
   */
  this.stopEvent_ = options.stopEvent !== undefined ? options.stopEvent : true;

  /**
   * @private
   * @type {Element}
   */
  this.element_ = document.createElement('DIV');
  this.element_.className = 'ol-overlay-container';
  this.element_.style.position = 'absolute';

  /**
   * @protected
   * @type {boolean}
   */
  this.autoPan = options.autoPan !== undefined ? options.autoPan : false;

  /**
   * @private
   * @type {olx.animation.PanOptions}
   */
  this.autoPanAnimation_ = options.autoPanAnimation !== undefined ?
      options.autoPanAnimation : /** @type {olx.animation.PanOptions} */ ({});

  /**
   * @private
   * @type {number}
   */
  this.autoPanMargin_ = options.autoPanMargin !== undefined ?
      options.autoPanMargin : 20;

  /**
   * @private
   * @type {{bottom_: string,
   *         left_: string,
   *         right_: string,
   *         top_: string,
   *         visible: boolean}}
   */
  this.rendered_ = {
    bottom_: '',
    left_: '',
    right_: '',
    top_: '',
    visible: true
  };

  /**
   * @private
   * @type {?ol.EventsKey}
   */
  this.mapPostrenderListenerKey_ = null;

  ol.events.listen(
      this, ol.Object.getChangeEventType(ol.OverlayProperty.ELEMENT),
      this.handleElementChanged, this);

  ol.events.listen(
      this, ol.Object.getChangeEventType(ol.OverlayProperty.MAP),
      this.handleMapChanged, this);

  ol.events.listen(
      this, ol.Object.getChangeEventType(ol.OverlayProperty.OFFSET),
      this.handleOffsetChanged, this);

  ol.events.listen(
      this, ol.Object.getChangeEventType(ol.OverlayProperty.POSITION),
      this.handlePositionChanged, this);

  ol.events.listen(
      this, ol.Object.getChangeEventType(ol.OverlayProperty.POSITIONING),
      this.handlePositioningChanged, this);

  if (options.element !== undefined) {
    this.setElement(options.element);
  }

  this.setOffset(options.offset !== undefined ? options.offset : [0, 0]);

  this.setPositioning(options.positioning !== undefined ?
      /** @type {ol.OverlayPositioning} */ (options.positioning) :
      ol.OverlayPositioning.TOP_LEFT);

  if (options.position !== undefined) {
    this.setPosition(options.position);
  }

};
ol.inherits(ol.Overlay, ol.Object);


/**
 * Get the DOM element of this overlay.
 * @return {Element|undefined} The Element containing the overlay.
 * @observable
 * @api stable
 */
ol.Overlay.prototype.getElement = function() {
  return /** @type {Element|undefined} */ (
      this.get(ol.OverlayProperty.ELEMENT));
};


/**
 * Get the overlay identifier which is set on constructor.
 * @return {number|string|undefined} Id.
 * @api
 */
ol.Overlay.prototype.getId = function() {
  return this.id_;
};


/**
 * Get the map associated with this overlay.
 * @return {ol.Map|undefined} The map that the overlay is part of.
 * @observable
 * @api stable
 */
ol.Overlay.prototype.getMap = function() {
  return /** @type {ol.Map|undefined} */ (
      this.get(ol.OverlayProperty.MAP));
};


/**
 * Get the offset of this overlay.
 * @return {Array.<number>} The offset.
 * @observable
 * @api stable
 */
ol.Overlay.prototype.getOffset = function() {
  return /** @type {Array.<number>} */ (
      this.get(ol.OverlayProperty.OFFSET));
};


/**
 * Get the current position of this overlay.
 * @return {ol.Coordinate|undefined} The spatial point that the overlay is
 *     anchored at.
 * @observable
 * @api stable
 */
ol.Overlay.prototype.getPosition = function() {
  return /** @type {ol.Coordinate|undefined} */ (
      this.get(ol.OverlayProperty.POSITION));
};


/**
 * Get the current positioning of this overlay.
 * @return {ol.OverlayPositioning} How the overlay is positioned
 *     relative to its point on the map.
 * @observable
 * @api stable
 */
ol.Overlay.prototype.getPositioning = function() {
  return /** @type {ol.OverlayPositioning} */ (
      this.get(ol.OverlayProperty.POSITIONING));
};


/**
 * @protected
 */
ol.Overlay.prototype.handleElementChanged = function() {
  ol.dom.removeChildren(this.element_);
  var element = this.getElement();
  if (element) {
    this.element_.appendChild(element);
  }
};


/**
 * @protected
 */
ol.Overlay.prototype.handleMapChanged = function() {
  if (this.mapPostrenderListenerKey_) {
    ol.dom.removeNode(this.element_);
    ol.events.unlistenByKey(this.mapPostrenderListenerKey_);
    this.mapPostrenderListenerKey_ = null;
  }
  var map = this.getMap();
  if (map) {
    this.mapPostrenderListenerKey_ = ol.events.listen(map,
        ol.MapEventType.POSTRENDER, this.render, this);
    this.updatePixelPosition();
    var container = this.stopEvent_ ?
        map.getOverlayContainerStopEvent() : map.getOverlayContainer();
    if (this.insertFirst_) {
      container.insertBefore(this.element_, container.childNodes[0] || null);
    } else {
      container.appendChild(this.element_);
    }
  }
};


/**
 * @protected
 */
ol.Overlay.prototype.render = function() {
  this.updatePixelPosition();
};


/**
 * @protected
 */
ol.Overlay.prototype.handleOffsetChanged = function() {
  this.updatePixelPosition();
};


/**
 * @protected
 */
ol.Overlay.prototype.handlePositionChanged = function() {
  this.updatePixelPosition();
  if (this.get(ol.OverlayProperty.POSITION) !== undefined && this.autoPan) {
    this.panIntoView_();
  }
};


/**
 * @protected
 */
ol.Overlay.prototype.handlePositioningChanged = function() {
  this.updatePixelPosition();
};


/**
 * Set the DOM element to be associated with this overlay.
 * @param {Element|undefined} element The Element containing the overlay.
 * @observable
 * @api stable
 */
ol.Overlay.prototype.setElement = function(element) {
  this.set(ol.OverlayProperty.ELEMENT, element);
};


/**
 * Set the map to be associated with this overlay.
 * @param {ol.Map|undefined} map The map that the overlay is part of.
 * @observable
 * @api stable
 */
ol.Overlay.prototype.setMap = function(map) {
  this.set(ol.OverlayProperty.MAP, map);
};


/**
 * Set the offset for this overlay.
 * @param {Array.<number>} offset Offset.
 * @observable
 * @api stable
 */
ol.Overlay.prototype.setOffset = function(offset) {
  this.set(ol.OverlayProperty.OFFSET, offset);
};


/**
 * Set the position for this overlay. If the position is `undefined` the
 * overlay is hidden.
 * @param {ol.Coordinate|undefined} position The spatial point that the overlay
 *     is anchored at.
 * @observable
 * @api stable
 */
ol.Overlay.prototype.setPosition = function(position) {
  this.set(ol.OverlayProperty.POSITION, position);
};


/**
 * Pan the map so that the overlay is entirely visible in the current viewport
 * (if necessary).
 * @private
 */
ol.Overlay.prototype.panIntoView_ = function() {
  var map = this.getMap();

  if (map === undefined || !map.getTargetElement()) {
    return;
  }

  var mapRect = this.getRect_(map.getTargetElement(), map.getSize());
  var element = /** @type {!Element} */ (this.getElement());
  var overlayRect = this.getRect_(element,
      [ol.dom.outerWidth(element), ol.dom.outerHeight(element)]);

  var margin = this.autoPanMargin_;
  if (!ol.extent.containsExtent(mapRect, overlayRect)) {
    // the overlay is not completely inside the viewport, so pan the map
    var offsetLeft = overlayRect[0] - mapRect[0];
    var offsetRight = mapRect[2] - overlayRect[2];
    var offsetTop = overlayRect[1] - mapRect[1];
    var offsetBottom = mapRect[3] - overlayRect[3];

    var delta = [0, 0];
    if (offsetLeft < 0) {
      // move map to the left
      delta[0] = offsetLeft - margin;
    } else if (offsetRight < 0) {
      // move map to the right
      delta[0] = Math.abs(offsetRight) + margin;
    }
    if (offsetTop < 0) {
      // move map up
      delta[1] = offsetTop - margin;
    } else if (offsetBottom < 0) {
      // move map down
      delta[1] = Math.abs(offsetBottom) + margin;
    }

    if (delta[0] !== 0 || delta[1] !== 0) {
      var center = /** @type {ol.Coordinate} */ (map.getView().getCenter());
      var centerPx = map.getPixelFromCoordinate(center);
      var newCenterPx = [
        centerPx[0] + delta[0],
        centerPx[1] + delta[1]
      ];

      if (this.autoPanAnimation_) {
        this.autoPanAnimation_.source = center;
        map.beforeRender(ol.animation.pan(this.autoPanAnimation_));
      }
      map.getView().setCenter(map.getCoordinateFromPixel(newCenterPx));
    }
  }
};


/**
 * Get the extent of an element relative to the document
 * @param {Element|undefined} element The element.
 * @param {ol.Size|undefined} size The size of the element.
 * @return {ol.Extent} The extent.
 * @private
 */
ol.Overlay.prototype.getRect_ = function(element, size) {
  var box = element.getBoundingClientRect();
  var offsetX = box.left + ol.global.pageXOffset;
  var offsetY = box.top + ol.global.pageYOffset;
  return [
    offsetX,
    offsetY,
    offsetX + size[0],
    offsetY + size[1]
  ];
};


/**
 * Set the positioning for this overlay.
 * @param {ol.OverlayPositioning} positioning how the overlay is
 *     positioned relative to its point on the map.
 * @observable
 * @api stable
 */
ol.Overlay.prototype.setPositioning = function(positioning) {
  this.set(ol.OverlayProperty.POSITIONING, positioning);
};


/**
 * Modify the visibility of the element.
 * @param {boolean} visible Element visibility.
 * @protected
 */
ol.Overlay.prototype.setVisible = function(visible) {
  if (this.rendered_.visible !== visible) {
    this.element_.style.display = visible ? '' : 'none';
    this.rendered_.visible = visible;
  }
};


/**
 * Update pixel position.
 * @protected
 */
ol.Overlay.prototype.updatePixelPosition = function() {
  var map = this.getMap();
  var position = this.getPosition();
  if (map === undefined || !map.isRendered() || position === undefined) {
    this.setVisible(false);
    return;
  }

  var pixel = map.getPixelFromCoordinate(position);
  var mapSize = map.getSize();
  this.updateRenderedPosition(pixel, mapSize);
};


/**
 * @param {ol.Pixel} pixel The pixel location.
 * @param {ol.Size|undefined} mapSize The map size.
 * @protected
 */
ol.Overlay.prototype.updateRenderedPosition = function(pixel, mapSize) {
  var style = this.element_.style;
  var offset = this.getOffset();

  var positioning = this.getPositioning();
  goog.DEBUG && console.assert(positioning !== undefined,
      'positioning should be defined');

  var offsetX = offset[0];
  var offsetY = offset[1];
  if (positioning == ol.OverlayPositioning.BOTTOM_RIGHT ||
      positioning == ol.OverlayPositioning.CENTER_RIGHT ||
      positioning == ol.OverlayPositioning.TOP_RIGHT) {
    if (this.rendered_.left_ !== '') {
      this.rendered_.left_ = style.left = '';
    }
    var right = Math.round(mapSize[0] - pixel[0] - offsetX) + 'px';
    if (this.rendered_.right_ != right) {
      this.rendered_.right_ = style.right = right;
    }
  } else {
    if (this.rendered_.right_ !== '') {
      this.rendered_.right_ = style.right = '';
    }
    if (positioning == ol.OverlayPositioning.BOTTOM_CENTER ||
        positioning == ol.OverlayPositioning.CENTER_CENTER ||
        positioning == ol.OverlayPositioning.TOP_CENTER) {
      offsetX -= this.element_.offsetWidth / 2;
    }
    var left = Math.round(pixel[0] + offsetX) + 'px';
    if (this.rendered_.left_ != left) {
      this.rendered_.left_ = style.left = left;
    }
  }
  if (positioning == ol.OverlayPositioning.BOTTOM_LEFT ||
      positioning == ol.OverlayPositioning.BOTTOM_CENTER ||
      positioning == ol.OverlayPositioning.BOTTOM_RIGHT) {
    if (this.rendered_.top_ !== '') {
      this.rendered_.top_ = style.top = '';
    }
    var bottom = Math.round(mapSize[1] - pixel[1] - offsetY) + 'px';
    if (this.rendered_.bottom_ != bottom) {
      this.rendered_.bottom_ = style.bottom = bottom;
    }
  } else {
    if (this.rendered_.bottom_ !== '') {
      this.rendered_.bottom_ = style.bottom = '';
    }
    if (positioning == ol.OverlayPositioning.CENTER_LEFT ||
        positioning == ol.OverlayPositioning.CENTER_CENTER ||
        positioning == ol.OverlayPositioning.CENTER_RIGHT) {
      offsetY -= this.element_.offsetHeight / 2;
    }
    var top = Math.round(pixel[1] + offsetY) + 'px';
    if (this.rendered_.top_ != top) {
      this.rendered_.top_ = style.top = top;
    }
  }

  this.setVisible(true);
};

goog.provide('ol.control.OverviewMap');

goog.require('ol');
goog.require('ol.Collection');
goog.require('ol.Map');
goog.require('ol.MapEventType');
goog.require('ol.Object');
goog.require('ol.ObjectEventType');
goog.require('ol.Overlay');
goog.require('ol.OverlayPositioning');
goog.require('ol.View');
goog.require('ol.control.Control');
goog.require('ol.coordinate');
goog.require('ol.css');
goog.require('ol.dom');
goog.require('ol.events');
goog.require('ol.events.EventType');
goog.require('ol.extent');


/**
 * Create a new control with a map acting as an overview map for an other
 * defined map.
 * @constructor
 * @extends {ol.control.Control}
 * @param {olx.control.OverviewMapOptions=} opt_options OverviewMap options.
 * @api
 */
ol.control.OverviewMap = function(opt_options) {

  var options = opt_options ? opt_options : {};

  /**
   * @type {boolean}
   * @private
   */
  this.collapsed_ = options.collapsed !== undefined ? options.collapsed : true;

  /**
   * @private
   * @type {boolean}
   */
  this.collapsible_ = options.collapsible !== undefined ?
      options.collapsible : true;

  if (!this.collapsible_) {
    this.collapsed_ = false;
  }

  var className = options.className !== undefined ? options.className : 'ol-overviewmap';

  var tipLabel = options.tipLabel !== undefined ? options.tipLabel : 'Overview map';

  var collapseLabel = options.collapseLabel !== undefined ? options.collapseLabel : '\u00AB';

  if (typeof collapseLabel === 'string') {
    /**
     * @private
     * @type {Node}
     */
    this.collapseLabel_ = document.createElement('span');
    this.collapseLabel_.textContent = collapseLabel;
  } else {
    this.collapseLabel_ = collapseLabel;
  }

  var label = options.label !== undefined ? options.label : '\u00BB';


  if (typeof label === 'string') {
    /**
     * @private
     * @type {Node}
     */
    this.label_ = document.createElement('span');
    this.label_.textContent = label;
  } else {
    this.label_ = label;
  }

  var activeLabel = (this.collapsible_ && !this.collapsed_) ?
      this.collapseLabel_ : this.label_;
  var button = document.createElement('button');
  button.setAttribute('type', 'button');
  button.title = tipLabel;
  button.appendChild(activeLabel);

  ol.events.listen(button, ol.events.EventType.CLICK,
      this.handleClick_, this);

  var ovmapDiv = document.createElement('DIV');
  ovmapDiv.className = 'ol-overviewmap-map';

  /**
   * @type {ol.Map}
   * @private
   */
  this.ovmap_ = new ol.Map({
    controls: new ol.Collection(),
    interactions: new ol.Collection(),
    target: ovmapDiv,
    view: options.view
  });
  var ovmap = this.ovmap_;

  if (options.layers) {
    options.layers.forEach(
        /**
       * @param {ol.layer.Layer} layer Layer.
       */
        function(layer) {
          ovmap.addLayer(layer);
        }, this);
  }

  var box = document.createElement('DIV');
  box.className = 'ol-overviewmap-box';
  box.style.boxSizing = 'border-box';

  /**
   * @type {ol.Overlay}
   * @private
   */
  this.boxOverlay_ = new ol.Overlay({
    position: [0, 0],
    positioning: ol.OverlayPositioning.BOTTOM_LEFT,
    element: box
  });
  this.ovmap_.addOverlay(this.boxOverlay_);

  var cssClasses = className + ' ' + ol.css.CLASS_UNSELECTABLE + ' ' +
      ol.css.CLASS_CONTROL +
      (this.collapsed_ && this.collapsible_ ? ' ol-collapsed' : '') +
      (this.collapsible_ ? '' : ' ol-uncollapsible');
  var element = document.createElement('div');
  element.className = cssClasses;
  element.appendChild(ovmapDiv);
  element.appendChild(button);

  var render = options.render ? options.render : ol.control.OverviewMap.render;

  ol.control.Control.call(this, {
    element: element,
    render: render,
    target: options.target
  });
};
ol.inherits(ol.control.OverviewMap, ol.control.Control);


/**
 * @inheritDoc
 * @api
 */
ol.control.OverviewMap.prototype.setMap = function(map) {
  var oldMap = this.getMap();
  if (map === oldMap) {
    return;
  }
  if (oldMap) {
    var oldView = oldMap.getView();
    if (oldView) {
      this.unbindView_(oldView);
    }
  }
  ol.control.Control.prototype.setMap.call(this, map);

  if (map) {
    this.listenerKeys.push(ol.events.listen(
        map, ol.ObjectEventType.PROPERTYCHANGE,
        this.handleMapPropertyChange_, this));

    // TODO: to really support map switching, this would need to be reworked
    if (this.ovmap_.getLayers().getLength() === 0) {
      this.ovmap_.setLayerGroup(map.getLayerGroup());
    }

    var view = map.getView();
    if (view) {
      this.bindView_(view);
      if (view.isDef()) {
        this.ovmap_.updateSize();
        this.resetExtent_();
      }
    }
  }
};


/**
 * Handle map property changes.  This only deals with changes to the map's view.
 * @param {ol.ObjectEvent} event The propertychange event.
 * @private
 */
ol.control.OverviewMap.prototype.handleMapPropertyChange_ = function(event) {
  if (event.key === ol.MapProperty.VIEW) {
    var oldView = /** @type {ol.View} */ (event.oldValue);
    if (oldView) {
      this.unbindView_(oldView);
    }
    var newView = this.getMap().getView();
    this.bindView_(newView);
  }
};


/**
 * Register listeners for view property changes.
 * @param {ol.View} view The view.
 * @private
 */
ol.control.OverviewMap.prototype.bindView_ = function(view) {
  ol.events.listen(view,
      ol.Object.getChangeEventType(ol.View.Property.ROTATION),
      this.handleRotationChanged_, this);
};


/**
 * Unregister listeners for view property changes.
 * @param {ol.View} view The view.
 * @private
 */
ol.control.OverviewMap.prototype.unbindView_ = function(view) {
  ol.events.unlisten(view,
      ol.Object.getChangeEventType(ol.View.Property.ROTATION),
      this.handleRotationChanged_, this);
};


/**
 * Handle rotation changes to the main map.
 * TODO: This should rotate the extent rectrangle instead of the
 * overview map's view.
 * @private
 */
ol.control.OverviewMap.prototype.handleRotationChanged_ = function() {
  this.ovmap_.getView().setRotation(this.getMap().getView().getRotation());
};


/**
 * Update the overview map element.
 * @param {ol.MapEvent} mapEvent Map event.
 * @this {ol.control.OverviewMap}
 * @api
 */
ol.control.OverviewMap.render = function(mapEvent) {
  this.validateExtent_();
  this.updateBox_();
};


/**
 * Reset the overview map extent if the box size (width or
 * height) is less than the size of the overview map size times minRatio
 * or is greater than the size of the overview size times maxRatio.
 *
 * If the map extent was not reset, the box size can fits in the defined
 * ratio sizes. This method then checks if is contained inside the overview
 * map current extent. If not, recenter the overview map to the current
 * main map center location.
 * @private
 */
ol.control.OverviewMap.prototype.validateExtent_ = function() {
  var map = this.getMap();
  var ovmap = this.ovmap_;

  if (!map.isRendered() || !ovmap.isRendered()) {
    return;
  }

  var mapSize = /** @type {ol.Size} */ (map.getSize());

  var view = map.getView();
  var extent = view.calculateExtent(mapSize);

  var ovmapSize = /** @type {ol.Size} */ (ovmap.getSize());

  var ovview = ovmap.getView();
  var ovextent = ovview.calculateExtent(ovmapSize);

  var topLeftPixel =
      ovmap.getPixelFromCoordinate(ol.extent.getTopLeft(extent));
  var bottomRightPixel =
      ovmap.getPixelFromCoordinate(ol.extent.getBottomRight(extent));

  var boxWidth = Math.abs(topLeftPixel[0] - bottomRightPixel[0]);
  var boxHeight = Math.abs(topLeftPixel[1] - bottomRightPixel[1]);

  var ovmapWidth = ovmapSize[0];
  var ovmapHeight = ovmapSize[1];

  if (boxWidth < ovmapWidth * ol.OVERVIEWMAP_MIN_RATIO ||
      boxHeight < ovmapHeight * ol.OVERVIEWMAP_MIN_RATIO ||
      boxWidth > ovmapWidth * ol.OVERVIEWMAP_MAX_RATIO ||
      boxHeight > ovmapHeight * ol.OVERVIEWMAP_MAX_RATIO) {
    this.resetExtent_();
  } else if (!ol.extent.containsExtent(ovextent, extent)) {
    this.recenter_();
  }
};


/**
 * Reset the overview map extent to half calculated min and max ratio times
 * the extent of the main map.
 * @private
 */
ol.control.OverviewMap.prototype.resetExtent_ = function() {
  if (ol.OVERVIEWMAP_MAX_RATIO === 0 || ol.OVERVIEWMAP_MIN_RATIO === 0) {
    return;
  }

  var map = this.getMap();
  var ovmap = this.ovmap_;

  var mapSize = /** @type {ol.Size} */ (map.getSize());

  var view = map.getView();
  var extent = view.calculateExtent(mapSize);

  var ovmapSize = /** @type {ol.Size} */ (ovmap.getSize());

  var ovview = ovmap.getView();

  // get how many times the current map overview could hold different
  // box sizes using the min and max ratio, pick the step in the middle used
  // to calculate the extent from the main map to set it to the overview map,
  var steps = Math.log(
      ol.OVERVIEWMAP_MAX_RATIO / ol.OVERVIEWMAP_MIN_RATIO) / Math.LN2;
  var ratio = 1 / (Math.pow(2, steps / 2) * ol.OVERVIEWMAP_MIN_RATIO);
  ol.extent.scaleFromCenter(extent, ratio);
  ovview.fit(extent, ovmapSize);
};


/**
 * Set the center of the overview map to the map center without changing its
 * resolution.
 * @private
 */
ol.control.OverviewMap.prototype.recenter_ = function() {
  var map = this.getMap();
  var ovmap = this.ovmap_;

  var view = map.getView();

  var ovview = ovmap.getView();

  ovview.setCenter(view.getCenter());
};


/**
 * Update the box using the main map extent
 * @private
 */
ol.control.OverviewMap.prototype.updateBox_ = function() {
  var map = this.getMap();
  var ovmap = this.ovmap_;

  if (!map.isRendered() || !ovmap.isRendered()) {
    return;
  }

  var mapSize = /** @type {ol.Size} */ (map.getSize());

  var view = map.getView();

  var ovview = ovmap.getView();

  var rotation = view.getRotation();

  var overlay = this.boxOverlay_;
  var box = this.boxOverlay_.getElement();
  var extent = view.calculateExtent(mapSize);
  var ovresolution = ovview.getResolution();
  var bottomLeft = ol.extent.getBottomLeft(extent);
  var topRight = ol.extent.getTopRight(extent);

  // set position using bottom left coordinates
  var rotateBottomLeft = this.calculateCoordinateRotate_(rotation, bottomLeft);
  overlay.setPosition(rotateBottomLeft);

  // set box size calculated from map extent size and overview map resolution
  if (box) {
    box.style.width = Math.abs((bottomLeft[0] - topRight[0]) / ovresolution) + 'px';
    box.style.height = Math.abs((topRight[1] - bottomLeft[1]) / ovresolution) + 'px';
  }
};


/**
 * @param {number} rotation Target rotation.
 * @param {ol.Coordinate} coordinate Coordinate.
 * @return {ol.Coordinate|undefined} Coordinate for rotation and center anchor.
 * @private
 */
ol.control.OverviewMap.prototype.calculateCoordinateRotate_ = function(
    rotation, coordinate) {
  var coordinateRotate;

  var map = this.getMap();
  var view = map.getView();

  var currentCenter = view.getCenter();

  if (currentCenter) {
    coordinateRotate = [
      coordinate[0] - currentCenter[0],
      coordinate[1] - currentCenter[1]
    ];
    ol.coordinate.rotate(coordinateRotate, rotation);
    ol.coordinate.add(coordinateRotate, currentCenter);
  }
  return coordinateRotate;
};


/**
 * @param {Event} event The event to handle
 * @private
 */
ol.control.OverviewMap.prototype.handleClick_ = function(event) {
  event.preventDefault();
  this.handleToggle_();
};


/**
 * @private
 */
ol.control.OverviewMap.prototype.handleToggle_ = function() {
  this.element.classList.toggle('ol-collapsed');
  if (this.collapsed_) {
    ol.dom.replaceNode(this.collapseLabel_, this.label_);
  } else {
    ol.dom.replaceNode(this.label_, this.collapseLabel_);
  }
  this.collapsed_ = !this.collapsed_;

  // manage overview map if it had not been rendered before and control
  // is expanded
  var ovmap = this.ovmap_;
  if (!this.collapsed_ && !ovmap.isRendered()) {
    ovmap.updateSize();
    this.resetExtent_();
    ol.events.listenOnce(ovmap, ol.MapEventType.POSTRENDER,
        function(event) {
          this.updateBox_();
        },
        this);
  }
};


/**
 * Return `true` if the overview map is collapsible, `false` otherwise.
 * @return {boolean} True if the widget is collapsible.
 * @api stable
 */
ol.control.OverviewMap.prototype.getCollapsible = function() {
  return this.collapsible_;
};


/**
 * Set whether the overview map should be collapsible.
 * @param {boolean} collapsible True if the widget is collapsible.
 * @api stable
 */
ol.control.OverviewMap.prototype.setCollapsible = function(collapsible) {
  if (this.collapsible_ === collapsible) {
    return;
  }
  this.collapsible_ = collapsible;
  this.element.classList.toggle('ol-uncollapsible');
  if (!collapsible && this.collapsed_) {
    this.handleToggle_();
  }
};


/**
 * Collapse or expand the overview map according to the passed parameter. Will
 * not do anything if the overview map isn't collapsible or if the current
 * collapsed state is already the one requested.
 * @param {boolean} collapsed True if the widget is collapsed.
 * @api stable
 */
ol.control.OverviewMap.prototype.setCollapsed = function(collapsed) {
  if (!this.collapsible_ || this.collapsed_ === collapsed) {
    return;
  }
  this.handleToggle_();
};


/**
 * Determine if the overview map is collapsed.
 * @return {boolean} The overview map is collapsed.
 * @api stable
 */
ol.control.OverviewMap.prototype.getCollapsed = function() {
  return this.collapsed_;
};


/**
 * Return the overview map.
 * @return {ol.Map} Overview map.
 * @api
 */
ol.control.OverviewMap.prototype.getOverviewMap = function() {
  return this.ovmap_;
};

goog.provide('ol.control.ScaleLine');

goog.require('ol');
goog.require('ol.Object');
goog.require('ol.asserts');
goog.require('ol.control.Control');
goog.require('ol.css');
goog.require('ol.events');
goog.require('ol.proj.METERS_PER_UNIT');
goog.require('ol.proj.Units');


/**
 * @classdesc
 * A control displaying rough y-axis distances, calculated for the center of the
 * viewport. For conformal projections (e.g. EPSG:3857, the default view
 * projection in OpenLayers), the scale is valid for all directions.
 * No scale line will be shown when the y-axis distance of a pixel at the
 * viewport center cannot be calculated in the view projection.
 * By default the scale line will show in the bottom left portion of the map,
 * but this can be changed by using the css selector `.ol-scale-line`.
 *
 * @constructor
 * @extends {ol.control.Control}
 * @param {olx.control.ScaleLineOptions=} opt_options Scale line options.
 * @api stable
 */
ol.control.ScaleLine = function(opt_options) {

  var options = opt_options ? opt_options : {};

  var className = options.className !== undefined ? options.className : 'ol-scale-line';

  /**
   * @private
   * @type {Element}
   */
  this.innerElement_ = document.createElement('DIV');
  this.innerElement_.className = className + '-inner';

  /**
   * @private
   * @type {Element}
   */
  this.element_ = document.createElement('DIV');
  this.element_.className = className + ' ' + ol.css.CLASS_UNSELECTABLE;
  this.element_.appendChild(this.innerElement_);

  /**
   * @private
   * @type {?olx.ViewState}
   */
  this.viewState_ = null;

  /**
   * @private
   * @type {number}
   */
  this.minWidth_ = options.minWidth !== undefined ? options.minWidth : 64;

  /**
   * @private
   * @type {boolean}
   */
  this.renderedVisible_ = false;

  /**
   * @private
   * @type {number|undefined}
   */
  this.renderedWidth_ = undefined;

  /**
   * @private
   * @type {string}
   */
  this.renderedHTML_ = '';

  var render = options.render ? options.render : ol.control.ScaleLine.render;

  ol.control.Control.call(this, {
    element: this.element_,
    render: render,
    target: options.target
  });

  ol.events.listen(
      this, ol.Object.getChangeEventType(ol.control.ScaleLine.Property.UNITS),
      this.handleUnitsChanged_, this);

  this.setUnits(/** @type {ol.control.ScaleLine.Units} */ (options.units) ||
      ol.control.ScaleLine.Units.METRIC);

};
ol.inherits(ol.control.ScaleLine, ol.control.Control);


/**
 * @const
 * @type {Array.<number>}
 */
ol.control.ScaleLine.LEADING_DIGITS = [1, 2, 5];


/**
 * Return the units to use in the scale line.
 * @return {ol.control.ScaleLine.Units|undefined} The units to use in the scale
 *     line.
 * @observable
 * @api stable
 */
ol.control.ScaleLine.prototype.getUnits = function() {
  return /** @type {ol.control.ScaleLine.Units|undefined} */ (
      this.get(ol.control.ScaleLine.Property.UNITS));
};


/**
 * Update the scale line element.
 * @param {ol.MapEvent} mapEvent Map event.
 * @this {ol.control.ScaleLine}
 * @api
 */
ol.control.ScaleLine.render = function(mapEvent) {
  var frameState = mapEvent.frameState;
  if (!frameState) {
    this.viewState_ = null;
  } else {
    this.viewState_ = frameState.viewState;
  }
  this.updateElement_();
};


/**
 * @private
 */
ol.control.ScaleLine.prototype.handleUnitsChanged_ = function() {
  this.updateElement_();
};


/**
 * Set the units to use in the scale line.
 * @param {ol.control.ScaleLine.Units} units The units to use in the scale line.
 * @observable
 * @api stable
 */
ol.control.ScaleLine.prototype.setUnits = function(units) {
  this.set(ol.control.ScaleLine.Property.UNITS, units);
};


/**
 * @private
 */
ol.control.ScaleLine.prototype.updateElement_ = function() {
  var viewState = this.viewState_;

  if (!viewState) {
    if (this.renderedVisible_) {
      this.element_.style.display = 'none';
      this.renderedVisible_ = false;
    }
    return;
  }

  var center = viewState.center;
  var projection = viewState.projection;
  var metersPerUnit = projection.getMetersPerUnit();
  var pointResolution =
      projection.getPointResolution(viewState.resolution, center) *
      metersPerUnit;

  var nominalCount = this.minWidth_ * pointResolution;
  var suffix = '';
  var units = this.getUnits();
  if (units == ol.control.ScaleLine.Units.DEGREES) {
    var metersPerDegree = ol.proj.METERS_PER_UNIT[ol.proj.Units.DEGREES];
    pointResolution /= metersPerDegree;
    if (nominalCount < metersPerDegree / 60) {
      suffix = '\u2033'; // seconds
      pointResolution *= 3600;
    } else if (nominalCount < metersPerDegree) {
      suffix = '\u2032'; // minutes
      pointResolution *= 60;
    } else {
      suffix = '\u00b0'; // degrees
    }
  } else if (units == ol.control.ScaleLine.Units.IMPERIAL) {
    if (nominalCount < 0.9144) {
      suffix = 'in';
      pointResolution /= 0.0254;
    } else if (nominalCount < 1609.344) {
      suffix = 'ft';
      pointResolution /= 0.3048;
    } else {
      suffix = 'mi';
      pointResolution /= 1609.344;
    }
  } else if (units == ol.control.ScaleLine.Units.NAUTICAL) {
    pointResolution /= 1852;
    suffix = 'nm';
  } else if (units == ol.control.ScaleLine.Units.METRIC) {
    if (nominalCount < 1) {
      suffix = 'mm';
      pointResolution *= 1000;
    } else if (nominalCount < 1000) {
      suffix = 'm';
    } else {
      suffix = 'km';
      pointResolution /= 1000;
    }
  } else if (units == ol.control.ScaleLine.Units.US) {
    if (nominalCount < 0.9144) {
      suffix = 'in';
      pointResolution *= 39.37;
    } else if (nominalCount < 1609.344) {
      suffix = 'ft';
      pointResolution /= 0.30480061;
    } else {
      suffix = 'mi';
      pointResolution /= 1609.3472;
    }
  } else {
    ol.asserts.assert(false, 33); // Invalid units
  }

  var i = 3 * Math.floor(
      Math.log(this.minWidth_ * pointResolution) / Math.log(10));
  var count, width;
  while (true) {
    count = ol.control.ScaleLine.LEADING_DIGITS[((i % 3) + 3) % 3] *
        Math.pow(10, Math.floor(i / 3));
    width = Math.round(count / pointResolution);
    if (isNaN(width)) {
      this.element_.style.display = 'none';
      this.renderedVisible_ = false;
      return;
    } else if (width >= this.minWidth_) {
      break;
    }
    ++i;
  }

  var html = count + ' ' + suffix;
  if (this.renderedHTML_ != html) {
    this.innerElement_.innerHTML = html;
    this.renderedHTML_ = html;
  }

  if (this.renderedWidth_ != width) {
    this.innerElement_.style.width = width + 'px';
    this.renderedWidth_ = width;
  }

  if (!this.renderedVisible_) {
    this.element_.style.display = '';
    this.renderedVisible_ = true;
  }

};


/**
 * @enum {string}
 * @api
 */
ol.control.ScaleLine.Property = {
  UNITS: 'units'
};


/**
 * Units for the scale line. Supported values are `'degrees'`, `'imperial'`,
 * `'nautical'`, `'metric'`, `'us'`.
 * @enum {string}
 */
ol.control.ScaleLine.Units = {
  DEGREES: 'degrees',
  IMPERIAL: 'imperial',
  NAUTICAL: 'nautical',
  METRIC: 'metric',
  US: 'us'
};

// FIXME should possibly show tooltip when dragging?

goog.provide('ol.control.ZoomSlider');

goog.require('ol');
goog.require('ol.View');
goog.require('ol.animation');
goog.require('ol.control.Control');
goog.require('ol.css');
goog.require('ol.easing');
goog.require('ol.events');
goog.require('ol.events.Event');
goog.require('ol.events.EventType');
goog.require('ol.math');
goog.require('ol.pointer.PointerEventHandler');


/**
 * @classdesc
 * A slider type of control for zooming.
 *
 * Example:
 *
 *     map.addControl(new ol.control.ZoomSlider());
 *
 * @constructor
 * @extends {ol.control.Control}
 * @param {olx.control.ZoomSliderOptions=} opt_options Zoom slider options.
 * @api stable
 */
ol.control.ZoomSlider = function(opt_options) {

  var options = opt_options ? opt_options : {};

  /**
   * Will hold the current resolution of the view.
   *
   * @type {number|undefined}
   * @private
   */
  this.currentResolution_ = undefined;

  /**
   * The direction of the slider. Will be determined from actual display of the
   * container and defaults to ol.control.ZoomSlider.direction.VERTICAL.
   *
   * @type {ol.control.ZoomSlider.direction}
   * @private
   */
  this.direction_ = ol.control.ZoomSlider.direction.VERTICAL;

  /**
   * @type {boolean}
   * @private
   */
  this.dragging_;

  /**
   * @type {!Array.<ol.EventsKey>}
   * @private
   */
  this.dragListenerKeys_ = [];

  /**
   * @type {number}
   * @private
   */
  this.heightLimit_ = 0;

  /**
   * @type {number}
   * @private
   */
  this.widthLimit_ = 0;

  /**
   * @type {number|undefined}
   * @private
   */
  this.previousX_;

  /**
   * @type {number|undefined}
   * @private
   */
  this.previousY_;

  /**
   * The calculated thumb size (border box plus margins).  Set when initSlider_
   * is called.
   * @type {ol.Size}
   * @private
   */
  this.thumbSize_ = null;

  /**
   * Whether the slider is initialized.
   * @type {boolean}
   * @private
   */
  this.sliderInitialized_ = false;

  /**
   * @type {number}
   * @private
   */
  this.duration_ = options.duration !== undefined ? options.duration : 200;

  var className = options.className !== undefined ? options.className : 'ol-zoomslider';
  var thumbElement = document.createElement('button');
  thumbElement.setAttribute('type', 'button');
  thumbElement.className = className + '-thumb ' + ol.css.CLASS_UNSELECTABLE;
  var containerElement = document.createElement('div');
  containerElement.className = className + ' ' + ol.css.CLASS_UNSELECTABLE + ' ' + ol.css.CLASS_CONTROL;
  containerElement.appendChild(thumbElement);
  /**
   * @type {ol.pointer.PointerEventHandler}
   * @private
   */
  this.dragger_ = new ol.pointer.PointerEventHandler(containerElement);

  ol.events.listen(this.dragger_, ol.pointer.EventType.POINTERDOWN,
      this.handleDraggerStart_, this);
  ol.events.listen(this.dragger_, ol.pointer.EventType.POINTERMOVE,
      this.handleDraggerDrag_, this);
  ol.events.listen(this.dragger_, ol.pointer.EventType.POINTERUP,
      this.handleDraggerEnd_, this);

  ol.events.listen(containerElement, ol.events.EventType.CLICK,
      this.handleContainerClick_, this);
  ol.events.listen(thumbElement, ol.events.EventType.CLICK,
      ol.events.Event.stopPropagation);

  var render = options.render ? options.render : ol.control.ZoomSlider.render;

  ol.control.Control.call(this, {
    element: containerElement,
    render: render
  });
};
ol.inherits(ol.control.ZoomSlider, ol.control.Control);


/**
 * @inheritDoc
 */
ol.control.ZoomSlider.prototype.disposeInternal = function() {
  this.dragger_.dispose();
  ol.control.Control.prototype.disposeInternal.call(this);
};


/**
 * The enum for available directions.
 *
 * @enum {number}
 */
ol.control.ZoomSlider.direction = {
  VERTICAL: 0,
  HORIZONTAL: 1
};


/**
 * @inheritDoc
 */
ol.control.ZoomSlider.prototype.setMap = function(map) {
  ol.control.Control.prototype.setMap.call(this, map);
  if (map) {
    map.render();
  }
};


/**
 * Initializes the slider element. This will determine and set this controls
 * direction_ and also constrain the dragging of the thumb to always be within
 * the bounds of the container.
 *
 * @private
 */
ol.control.ZoomSlider.prototype.initSlider_ = function() {
  var container = this.element;
  var containerSize = {
    width: container.offsetWidth, height: container.offsetHeight
  };

  var thumb = container.firstElementChild;
  var computedStyle = ol.global.getComputedStyle(thumb);
  var thumbWidth = thumb.offsetWidth +
      parseFloat(computedStyle['marginRight']) +
      parseFloat(computedStyle['marginLeft']);
  var thumbHeight = thumb.offsetHeight +
      parseFloat(computedStyle['marginTop']) +
      parseFloat(computedStyle['marginBottom']);
  this.thumbSize_ = [thumbWidth, thumbHeight];

  if (containerSize.width > containerSize.height) {
    this.direction_ = ol.control.ZoomSlider.direction.HORIZONTAL;
    this.widthLimit_ = containerSize.width - thumbWidth;
  } else {
    this.direction_ = ol.control.ZoomSlider.direction.VERTICAL;
    this.heightLimit_ = containerSize.height - thumbHeight;
  }
  this.sliderInitialized_ = true;
};


/**
 * Update the zoomslider element.
 * @param {ol.MapEvent} mapEvent Map event.
 * @this {ol.control.ZoomSlider}
 * @api
 */
ol.control.ZoomSlider.render = function(mapEvent) {
  if (!mapEvent.frameState) {
    return;
  }
  if (!this.sliderInitialized_) {
    this.initSlider_();
  }
  var res = mapEvent.frameState.viewState.resolution;
  if (res !== this.currentResolution_) {
    this.currentResolution_ = res;
    this.setThumbPosition_(res);
  }
};


/**
 * @param {Event} event The browser event to handle.
 * @private
 */
ol.control.ZoomSlider.prototype.handleContainerClick_ = function(event) {
  var map = this.getMap();
  var view = map.getView();
  var currentResolution = view.getResolution();
  map.beforeRender(ol.animation.zoom({
    resolution: /** @type {number} */ (currentResolution),
    duration: this.duration_,
    easing: ol.easing.easeOut
  }));
  var relativePosition = this.getRelativePosition_(
      event.offsetX - this.thumbSize_[0] / 2,
      event.offsetY - this.thumbSize_[1] / 2);
  var resolution = this.getResolutionForPosition_(relativePosition);
  view.setResolution(view.constrainResolution(resolution));
};


/**
 * Handle dragger start events.
 * @param {ol.pointer.PointerEvent} event The drag event.
 * @private
 */
ol.control.ZoomSlider.prototype.handleDraggerStart_ = function(event) {
  if (!this.dragging_ &&
      event.originalEvent.target === this.element.firstElementChild) {
    this.getMap().getView().setHint(ol.View.Hint.INTERACTING, 1);
    this.previousX_ = event.clientX;
    this.previousY_ = event.clientY;
    this.dragging_ = true;

    if (this.dragListenerKeys_.length === 0) {
      var drag = this.handleDraggerDrag_;
      var end = this.handleDraggerEnd_;
      this.dragListenerKeys_.push(
        ol.events.listen(document, ol.events.EventType.MOUSEMOVE, drag, this),
        ol.events.listen(document, ol.events.EventType.TOUCHMOVE, drag, this),
        ol.events.listen(document, ol.pointer.EventType.POINTERMOVE, drag, this),
        ol.events.listen(document, ol.events.EventType.MOUSEUP, end, this),
        ol.events.listen(document, ol.events.EventType.TOUCHEND, end, this),
        ol.events.listen(document, ol.pointer.EventType.POINTERUP, end, this)
      );
    }
  }
};


/**
 * Handle dragger drag events.
 *
 * @param {ol.pointer.PointerEvent|Event} event The drag event.
 * @private
 */
ol.control.ZoomSlider.prototype.handleDraggerDrag_ = function(event) {
  if (this.dragging_) {
    var element = this.element.firstElementChild;
    var deltaX = event.clientX - this.previousX_ + parseInt(element.style.left, 10);
    var deltaY = event.clientY - this.previousY_ + parseInt(element.style.top, 10);
    var relativePosition = this.getRelativePosition_(deltaX, deltaY);
    this.currentResolution_ = this.getResolutionForPosition_(relativePosition);
    this.getMap().getView().setResolution(this.currentResolution_);
    this.setThumbPosition_(this.currentResolution_);
    this.previousX_ = event.clientX;
    this.previousY_ = event.clientY;
  }
};


/**
 * Handle dragger end events.
 * @param {ol.pointer.PointerEvent|Event} event The drag event.
 * @private
 */
ol.control.ZoomSlider.prototype.handleDraggerEnd_ = function(event) {
  if (this.dragging_) {
    var map = this.getMap();
    var view = map.getView();
    view.setHint(ol.View.Hint.INTERACTING, -1);
    map.beforeRender(ol.animation.zoom({
      resolution: /** @type {number} */ (this.currentResolution_),
      duration: this.duration_,
      easing: ol.easing.easeOut
    }));
    var resolution = view.constrainResolution(this.currentResolution_);
    view.setResolution(resolution);
    this.dragging_ = false;
    this.previousX_ = undefined;
    this.previousY_ = undefined;
    this.dragListenerKeys_.forEach(ol.events.unlistenByKey);
    this.dragListenerKeys_.length = 0;
  }
};


/**
 * Positions the thumb inside its container according to the given resolution.
 *
 * @param {number} res The res.
 * @private
 */
ol.control.ZoomSlider.prototype.setThumbPosition_ = function(res) {
  var position = this.getPositionForResolution_(res);
  var thumb = this.element.firstElementChild;

  if (this.direction_ == ol.control.ZoomSlider.direction.HORIZONTAL) {
    thumb.style.left = this.widthLimit_ * position + 'px';
  } else {
    thumb.style.top = this.heightLimit_ * position + 'px';
  }
};


/**
 * Calculates the relative position of the thumb given x and y offsets.  The
 * relative position scales from 0 to 1.  The x and y offsets are assumed to be
 * in pixel units within the dragger limits.
 *
 * @param {number} x Pixel position relative to the left of the slider.
 * @param {number} y Pixel position relative to the top of the slider.
 * @return {number} The relative position of the thumb.
 * @private
 */
ol.control.ZoomSlider.prototype.getRelativePosition_ = function(x, y) {
  var amount;
  if (this.direction_ === ol.control.ZoomSlider.direction.HORIZONTAL) {
    amount = x / this.widthLimit_;
  } else {
    amount = y / this.heightLimit_;
  }
  return ol.math.clamp(amount, 0, 1);
};


/**
 * Calculates the corresponding resolution of the thumb given its relative
 * position (where 0 is the minimum and 1 is the maximum).
 *
 * @param {number} position The relative position of the thumb.
 * @return {number} The corresponding resolution.
 * @private
 */
ol.control.ZoomSlider.prototype.getResolutionForPosition_ = function(position) {
  var fn = this.getMap().getView().getResolutionForValueFunction();
  return fn(1 - position);
};


/**
 * Determines the relative position of the slider for the given resolution.  A
 * relative position of 0 corresponds to the minimum view resolution.  A
 * relative position of 1 corresponds to the maximum view resolution.
 *
 * @param {number} res The resolution.
 * @return {number} The relative position value (between 0 and 1).
 * @private
 */
ol.control.ZoomSlider.prototype.getPositionForResolution_ = function(res) {
  var fn = this.getMap().getView().getValueForResolutionFunction();
  return 1 - fn(res);
};

goog.provide('ol.control.ZoomToExtent');

goog.require('ol');
goog.require('ol.events');
goog.require('ol.events.EventType');
goog.require('ol.control.Control');
goog.require('ol.css');


/**
 * @classdesc
 * A button control which, when pressed, changes the map view to a specific
 * extent. To style this control use the css selector `.ol-zoom-extent`.
 *
 * @constructor
 * @extends {ol.control.Control}
 * @param {olx.control.ZoomToExtentOptions=} opt_options Options.
 * @api stable
 */
ol.control.ZoomToExtent = function(opt_options) {
  var options = opt_options ? opt_options : {};

  /**
   * @type {ol.Extent}
   * @private
   */
  this.extent_ = options.extent ? options.extent : null;

  var className = options.className !== undefined ? options.className :
      'ol-zoom-extent';

  var label = options.label !== undefined ? options.label : 'E';
  var tipLabel = options.tipLabel !== undefined ?
      options.tipLabel : 'Fit to extent';
  var button = document.createElement('button');
  button.setAttribute('type', 'button');
  button.title = tipLabel;
  button.appendChild(
    typeof label === 'string' ? document.createTextNode(label) : label
  );

  ol.events.listen(button, ol.events.EventType.CLICK,
      this.handleClick_, this);

  var cssClasses = className + ' ' + ol.css.CLASS_UNSELECTABLE + ' ' +
      ol.css.CLASS_CONTROL;
  var element = document.createElement('div');
  element.className = cssClasses;
  element.appendChild(button);

  ol.control.Control.call(this, {
    element: element,
    target: options.target
  });
};
ol.inherits(ol.control.ZoomToExtent, ol.control.Control);


/**
 * @param {Event} event The event to handle
 * @private
 */
ol.control.ZoomToExtent.prototype.handleClick_ = function(event) {
  event.preventDefault();
  this.handleZoomToExtent_();
};


/**
 * @private
 */
ol.control.ZoomToExtent.prototype.handleZoomToExtent_ = function() {
  var map = this.getMap();
  var view = map.getView();
  var extent = !this.extent_ ? view.getProjection().getExtent() : this.extent_;
  var size = /** @type {ol.Size} */ (map.getSize());
  view.fit(extent, size);
};

goog.provide('ol.DeviceOrientation');

goog.require('ol.events');
goog.require('ol');
goog.require('ol.Object');
goog.require('ol.has');
goog.require('ol.math');


/**
 * @enum {string}
 */
ol.DeviceOrientationProperty = {
  ALPHA: 'alpha',
  BETA: 'beta',
  GAMMA: 'gamma',
  HEADING: 'heading',
  TRACKING: 'tracking'
};


/**
 * @classdesc
 * The ol.DeviceOrientation class provides access to information from
 * DeviceOrientation events.  See the [HTML 5 DeviceOrientation Specification](
 * http://www.w3.org/TR/orientation-event/) for more details.
 *
 * Many new computers, and especially mobile phones
 * and tablets, provide hardware support for device orientation. Web
 * developers targeting mobile devices will be especially interested in this
 * class.
 *
 * Device orientation data are relative to a common starting point. For mobile
 * devices, the starting point is to lay your phone face up on a table with the
 * top of the phone pointing north. This represents the zero state. All
 * angles are then relative to this state. For computers, it is the same except
 * the screen is open at 90 degrees.
 *
 * Device orientation is reported as three angles - `alpha`, `beta`, and
 * `gamma` - relative to the starting position along the three planar axes X, Y
 * and Z. The X axis runs from the left edge to the right edge through the
 * middle of the device. Similarly, the Y axis runs from the bottom to the top
 * of the device through the middle. The Z axis runs from the back to the front
 * through the middle. In the starting position, the X axis points to the
 * right, the Y axis points away from you and the Z axis points straight up
 * from the device lying flat.
 *
 * The three angles representing the device orientation are relative to the
 * three axes. `alpha` indicates how much the device has been rotated around the
 * Z axis, which is commonly interpreted as the compass heading (see note
 * below). `beta` indicates how much the device has been rotated around the X
 * axis, or how much it is tilted from front to back.  `gamma` indicates how
 * much the device has been rotated around the Y axis, or how much it is tilted
 * from left to right.
 *
 * For most browsers, the `alpha` value returns the compass heading so if the
 * device points north, it will be 0.  With Safari on iOS, the 0 value of
 * `alpha` is calculated from when device orientation was first requested.
 * ol.DeviceOrientation provides the `heading` property which normalizes this
 * behavior across all browsers for you.
 *
 * It is important to note that the HTML 5 DeviceOrientation specification
 * indicates that `alpha`, `beta` and `gamma` are in degrees while the
 * equivalent properties in ol.DeviceOrientation are in radians for consistency
 * with all other uses of angles throughout OpenLayers.
 *
 * To get notified of device orientation changes, register a listener for the
 * generic `change` event on your `ol.DeviceOrientation` instance.
 *
 * @see {@link http://www.w3.org/TR/orientation-event/}
 *
 * @constructor
 * @extends {ol.Object}
 * @param {olx.DeviceOrientationOptions=} opt_options Options.
 * @api
 */
ol.DeviceOrientation = function(opt_options) {

  ol.Object.call(this);

  var options = opt_options ? opt_options : {};

  /**
   * @private
   * @type {?ol.EventsKey}
   */
  this.listenerKey_ = null;

  ol.events.listen(this,
      ol.Object.getChangeEventType(ol.DeviceOrientationProperty.TRACKING),
      this.handleTrackingChanged_, this);

  this.setTracking(options.tracking !== undefined ? options.tracking : false);

};
ol.inherits(ol.DeviceOrientation, ol.Object);


/**
 * @inheritDoc
 */
ol.DeviceOrientation.prototype.disposeInternal = function() {
  this.setTracking(false);
  ol.Object.prototype.disposeInternal.call(this);
};


/**
 * @private
 * @param {Event} originalEvent Event.
 */
ol.DeviceOrientation.prototype.orientationChange_ = function(originalEvent) {
  var event = /** @type {DeviceOrientationEvent} */ (originalEvent);
  if (event.alpha !== null) {
    var alpha = ol.math.toRadians(event.alpha);
    this.set(ol.DeviceOrientationProperty.ALPHA, alpha);
    // event.absolute is undefined in iOS.
    if (typeof event.absolute === 'boolean' && event.absolute) {
      this.set(ol.DeviceOrientationProperty.HEADING, alpha);
    } else if (typeof event.webkitCompassHeading === 'number' &&
               event.webkitCompassAccuracy != -1) {
      var heading = ol.math.toRadians(event.webkitCompassHeading);
      this.set(ol.DeviceOrientationProperty.HEADING, heading);
    }
  }
  if (event.beta !== null) {
    this.set(ol.DeviceOrientationProperty.BETA,
        ol.math.toRadians(event.beta));
  }
  if (event.gamma !== null) {
    this.set(ol.DeviceOrientationProperty.GAMMA,
        ol.math.toRadians(event.gamma));
  }
  this.changed();
};


/**
 * Rotation around the device z-axis (in radians).
 * @return {number|undefined} The euler angle in radians of the device from the
 *     standard Z axis.
 * @observable
 * @api
 */
ol.DeviceOrientation.prototype.getAlpha = function() {
  return /** @type {number|undefined} */ (
      this.get(ol.DeviceOrientationProperty.ALPHA));
};


/**
 * Rotation around the device x-axis (in radians).
 * @return {number|undefined} The euler angle in radians of the device from the
 *     planar X axis.
 * @observable
 * @api
 */
ol.DeviceOrientation.prototype.getBeta = function() {
  return /** @type {number|undefined} */ (
      this.get(ol.DeviceOrientationProperty.BETA));
};


/**
 * Rotation around the device y-axis (in radians).
 * @return {number|undefined} The euler angle in radians of the device from the
 *     planar Y axis.
 * @observable
 * @api
 */
ol.DeviceOrientation.prototype.getGamma = function() {
  return /** @type {number|undefined} */ (
      this.get(ol.DeviceOrientationProperty.GAMMA));
};


/**
 * The heading of the device relative to north (in radians).
 * @return {number|undefined} The heading of the device relative to north, in
 *     radians, normalizing for different browser behavior.
 * @observable
 * @api
 */
ol.DeviceOrientation.prototype.getHeading = function() {
  return /** @type {number|undefined} */ (
      this.get(ol.DeviceOrientationProperty.HEADING));
};


/**
 * Determine if orientation is being tracked.
 * @return {boolean} Changes in device orientation are being tracked.
 * @observable
 * @api
 */
ol.DeviceOrientation.prototype.getTracking = function() {
  return /** @type {boolean} */ (
      this.get(ol.DeviceOrientationProperty.TRACKING));
};


/**
 * @private
 */
ol.DeviceOrientation.prototype.handleTrackingChanged_ = function() {
  if (ol.has.DEVICE_ORIENTATION) {
    var tracking = this.getTracking();
    if (tracking && !this.listenerKey_) {
      this.listenerKey_ = ol.events.listen(ol.global, 'deviceorientation',
          this.orientationChange_, this);
    } else if (!tracking && this.listenerKey_ !== null) {
      ol.events.unlistenByKey(this.listenerKey_);
      this.listenerKey_ = null;
    }
  }
};


/**
 * Enable or disable tracking of device orientation events.
 * @param {boolean} tracking The status of tracking changes to alpha, beta and
 *     gamma. If true, changes are tracked and reported immediately.
 * @observable
 * @api
 */
ol.DeviceOrientation.prototype.setTracking = function(tracking) {
  this.set(ol.DeviceOrientationProperty.TRACKING, tracking);
};

goog.provide('ol.Feature');

goog.require('ol.asserts');
goog.require('ol.events');
goog.require('ol.events.EventType');
goog.require('ol');
goog.require('ol.Object');
goog.require('ol.geom.Geometry');
goog.require('ol.style.Style');


/**
 * @classdesc
 * A vector object for geographic features with a geometry and other
 * attribute properties, similar to the features in vector file formats like
 * GeoJSON.
 *
 * Features can be styled individually with `setStyle`; otherwise they use the
 * style of their vector layer.
 *
 * Note that attribute properties are set as {@link ol.Object} properties on
 * the feature object, so they are observable, and have get/set accessors.
 *
 * Typically, a feature has a single geometry property. You can set the
 * geometry using the `setGeometry` method and get it with `getGeometry`.
 * It is possible to store more than one geometry on a feature using attribute
 * properties. By default, the geometry used for rendering is identified by
 * the property name `geometry`. If you want to use another geometry property
 * for rendering, use the `setGeometryName` method to change the attribute
 * property associated with the geometry for the feature.  For example:
 *
 * ```js
 * var feature = new ol.Feature({
 *   geometry: new ol.geom.Polygon(polyCoords),
 *   labelPoint: new ol.geom.Point(labelCoords),
 *   name: 'My Polygon'
 * });
 *
 * // get the polygon geometry
 * var poly = feature.getGeometry();
 *
 * // Render the feature as a point using the coordinates from labelPoint
 * feature.setGeometryName('labelPoint');
 *
 * // get the point geometry
 * var point = feature.getGeometry();
 * ```
 *
 * @constructor
 * @extends {ol.Object}
 * @param {ol.geom.Geometry|Object.<string, *>=} opt_geometryOrProperties
 *     You may pass a Geometry object directly, or an object literal
 *     containing properties.  If you pass an object literal, you may
 *     include a Geometry associated with a `geometry` key.
 * @api stable
 */
ol.Feature = function(opt_geometryOrProperties) {

  ol.Object.call(this);

  /**
   * @private
   * @type {number|string|undefined}
   */
  this.id_ = undefined;

  /**
   * @type {string}
   * @private
   */
  this.geometryName_ = 'geometry';

  /**
   * User provided style.
   * @private
   * @type {ol.style.Style|Array.<ol.style.Style>|
   *     ol.FeatureStyleFunction}
   */
  this.style_ = null;

  /**
   * @private
   * @type {ol.FeatureStyleFunction|undefined}
   */
  this.styleFunction_ = undefined;

  /**
   * @private
   * @type {?ol.EventsKey}
   */
  this.geometryChangeKey_ = null;

  ol.events.listen(
      this, ol.Object.getChangeEventType(this.geometryName_),
      this.handleGeometryChanged_, this);

  if (opt_geometryOrProperties !== undefined) {
    if (opt_geometryOrProperties instanceof ol.geom.Geometry ||
        !opt_geometryOrProperties) {
      var geometry = opt_geometryOrProperties;
      this.setGeometry(geometry);
    } else {
      /** @type {Object.<string, *>} */
      var properties = opt_geometryOrProperties;
      this.setProperties(properties);
    }
  }
};
ol.inherits(ol.Feature, ol.Object);


/**
 * Clone this feature. If the original feature has a geometry it
 * is also cloned. The feature id is not set in the clone.
 * @return {ol.Feature} The clone.
 * @api stable
 */
ol.Feature.prototype.clone = function() {
  var clone = new ol.Feature(this.getProperties());
  clone.setGeometryName(this.getGeometryName());
  var geometry = this.getGeometry();
  if (geometry) {
    clone.setGeometry(geometry.clone());
  }
  var style = this.getStyle();
  if (style) {
    clone.setStyle(style);
  }
  return clone;
};


/**
 * Get the feature's default geometry.  A feature may have any number of named
 * geometries.  The "default" geometry (the one that is rendered by default) is
 * set when calling {@link ol.Feature#setGeometry}.
 * @return {ol.geom.Geometry|undefined} The default geometry for the feature.
 * @api stable
 * @observable
 */
ol.Feature.prototype.getGeometry = function() {
  return /** @type {ol.geom.Geometry|undefined} */ (
      this.get(this.geometryName_));
};


/**
 * Get the feature identifier.  This is a stable identifier for the feature and
 * is either set when reading data from a remote source or set explicitly by
 * calling {@link ol.Feature#setId}.
 * @return {number|string|undefined} Id.
 * @api stable
 * @observable
 */
ol.Feature.prototype.getId = function() {
  return this.id_;
};


/**
 * Get the name of the feature's default geometry.  By default, the default
 * geometry is named `geometry`.
 * @return {string} Get the property name associated with the default geometry
 *     for this feature.
 * @api stable
 */
ol.Feature.prototype.getGeometryName = function() {
  return this.geometryName_;
};


/**
 * Get the feature's style.  This return for this method depends on what was
 * provided to the {@link ol.Feature#setStyle} method.
 * @return {ol.style.Style|Array.<ol.style.Style>|
 *     ol.FeatureStyleFunction} The feature style.
 * @api stable
 * @observable
 */
ol.Feature.prototype.getStyle = function() {
  return this.style_;
};


/**
 * Get the feature's style function.
 * @return {ol.FeatureStyleFunction|undefined} Return a function
 * representing the current style of this feature.
 * @api stable
 */
ol.Feature.prototype.getStyleFunction = function() {
  return this.styleFunction_;
};


/**
 * @private
 */
ol.Feature.prototype.handleGeometryChange_ = function() {
  this.changed();
};


/**
 * @private
 */
ol.Feature.prototype.handleGeometryChanged_ = function() {
  if (this.geometryChangeKey_) {
    ol.events.unlistenByKey(this.geometryChangeKey_);
    this.geometryChangeKey_ = null;
  }
  var geometry = this.getGeometry();
  if (geometry) {
    this.geometryChangeKey_ = ol.events.listen(geometry,
        ol.events.EventType.CHANGE, this.handleGeometryChange_, this);
  }
  this.changed();
};


/**
 * Set the default geometry for the feature.  This will update the property
 * with the name returned by {@link ol.Feature#getGeometryName}.
 * @param {ol.geom.Geometry|undefined} geometry The new geometry.
 * @api stable
 * @observable
 */
ol.Feature.prototype.setGeometry = function(geometry) {
  this.set(this.geometryName_, geometry);
};


/**
 * Set the style for the feature.  This can be a single style object, an array
 * of styles, or a function that takes a resolution and returns an array of
 * styles. If it is `null` the feature has no style (a `null` style).
 * @param {ol.style.Style|Array.<ol.style.Style>|
 *     ol.FeatureStyleFunction} style Style for this feature.
 * @api stable
 * @observable
 */
ol.Feature.prototype.setStyle = function(style) {
  this.style_ = style;
  this.styleFunction_ = !style ?
      undefined : ol.Feature.createStyleFunction(style);
  this.changed();
};


/**
 * Set the feature id.  The feature id is considered stable and may be used when
 * requesting features or comparing identifiers returned from a remote source.
 * The feature id can be used with the {@link ol.source.Vector#getFeatureById}
 * method.
 * @param {number|string|undefined} id The feature id.
 * @api stable
 * @observable
 */
ol.Feature.prototype.setId = function(id) {
  this.id_ = id;
  this.changed();
};


/**
 * Set the property name to be used when getting the feature's default geometry.
 * When calling {@link ol.Feature#getGeometry}, the value of the property with
 * this name will be returned.
 * @param {string} name The property name of the default geometry.
 * @api stable
 */
ol.Feature.prototype.setGeometryName = function(name) {
  ol.events.unlisten(
      this, ol.Object.getChangeEventType(this.geometryName_),
      this.handleGeometryChanged_, this);
  this.geometryName_ = name;
  ol.events.listen(
      this, ol.Object.getChangeEventType(this.geometryName_),
      this.handleGeometryChanged_, this);
  this.handleGeometryChanged_();
};


/**
 * Convert the provided object into a feature style function.  Functions passed
 * through unchanged.  Arrays of ol.style.Style or single style objects wrapped
 * in a new feature style function.
 * @param {ol.FeatureStyleFunction|!Array.<ol.style.Style>|!ol.style.Style} obj
 *     A feature style function, a single style, or an array of styles.
 * @return {ol.FeatureStyleFunction} A style function.
 */
ol.Feature.createStyleFunction = function(obj) {
  var styleFunction;

  if (typeof obj === 'function') {
    styleFunction = obj;
  } else {
    /**
     * @type {Array.<ol.style.Style>}
     */
    var styles;
    if (Array.isArray(obj)) {
      styles = obj;
    } else {
      ol.asserts.assert(obj instanceof ol.style.Style,
          41); // Expected an `ol.style.Style` or an array of `ol.style.Style`
      styles = [obj];
    }
    styleFunction = function() {
      return styles;
    };
  }
  return styleFunction;
};

goog.provide('ol.format.FormatType');


/**
 * @enum {string}
 */
ol.format.FormatType = {
  ARRAY_BUFFER: 'arraybuffer',
  JSON: 'json',
  TEXT: 'text',
  XML: 'xml'
};

goog.provide('ol.xml');

goog.require('ol');
goog.require('ol.array');


/**
 * This document should be used when creating nodes for XML serializations. This
 * document is also used by {@link ol.xml.createElementNS} and
 * {@link ol.xml.setAttributeNS}
 * @const
 * @type {Document}
 */
ol.xml.DOCUMENT = document.implementation.createDocument('', '', null);


/**
 * @param {string} namespaceURI Namespace URI.
 * @param {string} qualifiedName Qualified name.
 * @return {Node} Node.
 */
ol.xml.createElementNS = function(namespaceURI, qualifiedName) {
  return ol.xml.DOCUMENT.createElementNS(namespaceURI, qualifiedName);
};


/**
 * Recursively grab all text content of child nodes into a single string.
 * @param {Node} node Node.
 * @param {boolean} normalizeWhitespace Normalize whitespace: remove all line
 * breaks.
 * @return {string} All text content.
 * @api
 */
ol.xml.getAllTextContent = function(node, normalizeWhitespace) {
  return ol.xml.getAllTextContent_(node, normalizeWhitespace, []).join('');
};


/**
 * Recursively grab all text content of child nodes into a single string.
 * @param {Node} node Node.
 * @param {boolean} normalizeWhitespace Normalize whitespace: remove all line
 * breaks.
 * @param {Array.<string>} accumulator Accumulator.
 * @private
 * @return {Array.<string>} Accumulator.
 */
ol.xml.getAllTextContent_ = function(node, normalizeWhitespace, accumulator) {
  if (node.nodeType == Node.CDATA_SECTION_NODE ||
      node.nodeType == Node.TEXT_NODE) {
    if (normalizeWhitespace) {
      accumulator.push(String(node.nodeValue).replace(/(\r\n|\r|\n)/g, ''));
    } else {
      accumulator.push(node.nodeValue);
    }
  } else {
    var n;
    for (n = node.firstChild; n; n = n.nextSibling) {
      ol.xml.getAllTextContent_(n, normalizeWhitespace, accumulator);
    }
  }
  return accumulator;
};


/**
 * @param {?} value Value.
 * @return {boolean} Is document.
 */
ol.xml.isDocument = function(value) {
  return value instanceof Document;
};


/**
 * @param {?} value Value.
 * @return {boolean} Is node.
 */
ol.xml.isNode = function(value) {
  return value instanceof Node;
};


/**
 * @param {Node} node Node.
 * @param {?string} namespaceURI Namespace URI.
 * @param {string} name Attribute name.
 * @return {string} Value
 */
ol.xml.getAttributeNS = function(node, namespaceURI, name) {
  return node.getAttributeNS(namespaceURI, name) || '';
};


/**
 * @param {Node} node Node.
 * @param {?string} namespaceURI Namespace URI.
 * @param {string} name Attribute name.
 * @param {string|number} value Value.
 */
ol.xml.setAttributeNS = function(node, namespaceURI, name, value) {
  node.setAttributeNS(namespaceURI, name, value);
};


/**
 * Parse an XML string to an XML Document.
 * @param {string} xml XML.
 * @return {Document} Document.
 * @api
 */
ol.xml.parse = function(xml) {
  return new DOMParser().parseFromString(xml, 'application/xml');
};


/**
 * Make an array extender function for extending the array at the top of the
 * object stack.
 * @param {function(this: T, Node, Array.<*>): (Array.<*>|undefined)}
 *     valueReader Value reader.
 * @param {T=} opt_this The object to use as `this` in `valueReader`.
 * @return {ol.XmlParser} Parser.
 * @template T
 */
ol.xml.makeArrayExtender = function(valueReader, opt_this) {
  return (
      /**
       * @param {Node} node Node.
       * @param {Array.<*>} objectStack Object stack.
       */
      function(node, objectStack) {
        var value = valueReader.call(opt_this, node, objectStack);
        if (value !== undefined) {
          goog.DEBUG && console.assert(Array.isArray(value),
              'valueReader function is expected to return an array of values');
          var array = /** @type {Array.<*>} */
              (objectStack[objectStack.length - 1]);
          goog.DEBUG && console.assert(Array.isArray(array),
              'objectStack is supposed to be an array of arrays');
          ol.array.extend(array, value);
        }
      });
};


/**
 * Make an array pusher function for pushing to the array at the top of the
 * object stack.
 * @param {function(this: T, Node, Array.<*>): *} valueReader Value reader.
 * @param {T=} opt_this The object to use as `this` in `valueReader`.
 * @return {ol.XmlParser} Parser.
 * @template T
 */
ol.xml.makeArrayPusher = function(valueReader, opt_this) {
  return (
      /**
       * @param {Node} node Node.
       * @param {Array.<*>} objectStack Object stack.
       */
      function(node, objectStack) {
        var value = valueReader.call(opt_this !== undefined ? opt_this : this,
            node, objectStack);
        if (value !== undefined) {
          var array = objectStack[objectStack.length - 1];
          goog.DEBUG && console.assert(Array.isArray(array),
              'objectStack is supposed to be an array of arrays');
          array.push(value);
        }
      });
};


/**
 * Make an object stack replacer function for replacing the object at the
 * top of the stack.
 * @param {function(this: T, Node, Array.<*>): *} valueReader Value reader.
 * @param {T=} opt_this The object to use as `this` in `valueReader`.
 * @return {ol.XmlParser} Parser.
 * @template T
 */
ol.xml.makeReplacer = function(valueReader, opt_this) {
  return (
      /**
       * @param {Node} node Node.
       * @param {Array.<*>} objectStack Object stack.
       */
      function(node, objectStack) {
        var value = valueReader.call(opt_this !== undefined ? opt_this : this,
            node, objectStack);
        if (value !== undefined) {
          objectStack[objectStack.length - 1] = value;
        }
      });
};


/**
 * Make an object property pusher function for adding a property to the
 * object at the top of the stack.
 * @param {function(this: T, Node, Array.<*>): *} valueReader Value reader.
 * @param {string=} opt_property Property.
 * @param {T=} opt_this The object to use as `this` in `valueReader`.
 * @return {ol.XmlParser} Parser.
 * @template T
 */
ol.xml.makeObjectPropertyPusher = function(valueReader, opt_property, opt_this) {
  goog.DEBUG && console.assert(valueReader !== undefined,
      'undefined valueReader, expected function(this: T, Node, Array.<*>)');
  return (
      /**
       * @param {Node} node Node.
       * @param {Array.<*>} objectStack Object stack.
       */
      function(node, objectStack) {
        var value = valueReader.call(opt_this !== undefined ? opt_this : this,
            node, objectStack);
        if (value !== undefined) {
          var object = /** @type {Object} */
              (objectStack[objectStack.length - 1]);
          var property = opt_property !== undefined ?
              opt_property : node.localName;
          var array;
          if (property in object) {
            array = object[property];
          } else {
            array = object[property] = [];
          }
          array.push(value);
        }
      });
};


/**
 * Make an object property setter function.
 * @param {function(this: T, Node, Array.<*>): *} valueReader Value reader.
 * @param {string=} opt_property Property.
 * @param {T=} opt_this The object to use as `this` in `valueReader`.
 * @return {ol.XmlParser} Parser.
 * @template T
 */
ol.xml.makeObjectPropertySetter = function(valueReader, opt_property, opt_this) {
  goog.DEBUG && console.assert(valueReader !== undefined,
      'undefined valueReader, expected function(this: T, Node, Array.<*>)');
  return (
      /**
       * @param {Node} node Node.
       * @param {Array.<*>} objectStack Object stack.
       */
      function(node, objectStack) {
        var value = valueReader.call(opt_this !== undefined ? opt_this : this,
            node, objectStack);
        if (value !== undefined) {
          var object = /** @type {Object} */
              (objectStack[objectStack.length - 1]);
          var property = opt_property !== undefined ?
              opt_property : node.localName;
          object[property] = value;
        }
      });
};


/**
 * Create a serializer that appends nodes written by its `nodeWriter` to its
 * designated parent. The parent is the `node` of the
 * {@link ol.XmlNodeStackItem} at the top of the `objectStack`.
 * @param {function(this: T, Node, V, Array.<*>)}
 *     nodeWriter Node writer.
 * @param {T=} opt_this The object to use as `this` in `nodeWriter`.
 * @return {ol.XmlSerializer} Serializer.
 * @template T, V
 */
ol.xml.makeChildAppender = function(nodeWriter, opt_this) {
  return function(node, value, objectStack) {
    nodeWriter.call(opt_this !== undefined ? opt_this : this,
        node, value, objectStack);
    var parent = objectStack[objectStack.length - 1];
    var parentNode = parent.node;
    goog.DEBUG && console.assert(ol.xml.isNode(parentNode) ||
        ol.xml.isDocument(parentNode),
        'expected parentNode %s to be a Node or a Document', parentNode);
    parentNode.appendChild(node);
  };
};


/**
 * Create a serializer that calls the provided `nodeWriter` from
 * {@link ol.xml.serialize}. This can be used by the parent writer to have the
 * 'nodeWriter' called with an array of values when the `nodeWriter` was
 * designed to serialize a single item. An example would be a LineString
 * geometry writer, which could be reused for writing MultiLineString
 * geometries.
 * @param {function(this: T, Node, V, Array.<*>)}
 *     nodeWriter Node writer.
 * @param {T=} opt_this The object to use as `this` in `nodeWriter`.
 * @return {ol.XmlSerializer} Serializer.
 * @template T, V
 */
ol.xml.makeArraySerializer = function(nodeWriter, opt_this) {
  var serializersNS, nodeFactory;
  return function(node, value, objectStack) {
    if (serializersNS === undefined) {
      serializersNS = {};
      var serializers = {};
      serializers[node.localName] = nodeWriter;
      serializersNS[node.namespaceURI] = serializers;
      nodeFactory = ol.xml.makeSimpleNodeFactory(node.localName);
    }
    ol.xml.serialize(serializersNS, nodeFactory, value, objectStack);
  };
};


/**
 * Create a node factory which can use the `opt_keys` passed to
 * {@link ol.xml.serialize} or {@link ol.xml.pushSerializeAndPop} as node names,
 * or a fixed node name. The namespace of the created nodes can either be fixed,
 * or the parent namespace will be used.
 * @param {string=} opt_nodeName Fixed node name which will be used for all
 *     created nodes. If not provided, the 3rd argument to the resulting node
 *     factory needs to be provided and will be the nodeName.
 * @param {string=} opt_namespaceURI Fixed namespace URI which will be used for
 *     all created nodes. If not provided, the namespace of the parent node will
 *     be used.
 * @return {function(*, Array.<*>, string=): (Node|undefined)} Node factory.
 */
ol.xml.makeSimpleNodeFactory = function(opt_nodeName, opt_namespaceURI) {
  var fixedNodeName = opt_nodeName;
  return (
      /**
       * @param {*} value Value.
       * @param {Array.<*>} objectStack Object stack.
       * @param {string=} opt_nodeName Node name.
       * @return {Node} Node.
       */
      function(value, objectStack, opt_nodeName) {
        var context = objectStack[objectStack.length - 1];
        var node = context.node;
        goog.DEBUG && console.assert(ol.xml.isNode(node) || ol.xml.isDocument(node),
            'expected node %s to be a Node or a Document', node);
        var nodeName = fixedNodeName;
        if (nodeName === undefined) {
          nodeName = opt_nodeName;
        }
        var namespaceURI = opt_namespaceURI;
        if (opt_namespaceURI === undefined) {
          namespaceURI = node.namespaceURI;
        }
        goog.DEBUG && console.assert(nodeName !== undefined, 'nodeName was undefined');
        return ol.xml.createElementNS(namespaceURI, /** @type {string} */ (nodeName));
      }
  );
};


/**
 * A node factory that creates a node using the parent's `namespaceURI` and the
 * `nodeName` passed by {@link ol.xml.serialize} or
 * {@link ol.xml.pushSerializeAndPop} to the node factory.
 * @const
 * @type {function(*, Array.<*>, string=): (Node|undefined)}
 */
ol.xml.OBJECT_PROPERTY_NODE_FACTORY = ol.xml.makeSimpleNodeFactory();


/**
 * Create an array of `values` to be used with {@link ol.xml.serialize} or
 * {@link ol.xml.pushSerializeAndPop}, where `orderedKeys` has to be provided as
 * `opt_key` argument.
 * @param {Object.<string, V>} object Key-value pairs for the sequence. Keys can
 *     be a subset of the `orderedKeys`.
 * @param {Array.<string>} orderedKeys Keys in the order of the sequence.
 * @return {Array.<V>} Values in the order of the sequence. The resulting array
 *     has the same length as the `orderedKeys` array. Values that are not
 *     present in `object` will be `undefined` in the resulting array.
 * @template V
 */
ol.xml.makeSequence = function(object, orderedKeys) {
  var length = orderedKeys.length;
  var sequence = new Array(length);
  for (var i = 0; i < length; ++i) {
    sequence[i] = object[orderedKeys[i]];
  }
  return sequence;
};


/**
 * Create a namespaced structure, using the same values for each namespace.
 * This can be used as a starting point for versioned parsers, when only a few
 * values are version specific.
 * @param {Array.<string>} namespaceURIs Namespace URIs.
 * @param {T} structure Structure.
 * @param {Object.<string, T>=} opt_structureNS Namespaced structure to add to.
 * @return {Object.<string, T>} Namespaced structure.
 * @template T
 */
ol.xml.makeStructureNS = function(namespaceURIs, structure, opt_structureNS) {
  /**
   * @type {Object.<string, *>}
   */
  var structureNS = opt_structureNS !== undefined ? opt_structureNS : {};
  var i, ii;
  for (i = 0, ii = namespaceURIs.length; i < ii; ++i) {
    structureNS[namespaceURIs[i]] = structure;
  }
  return structureNS;
};


/**
 * Parse a node using the parsers and object stack.
 * @param {Object.<string, Object.<string, ol.XmlParser>>} parsersNS
 *     Parsers by namespace.
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @param {*=} opt_this The object to use as `this`.
 */
ol.xml.parseNode = function(parsersNS, node, objectStack, opt_this) {
  var n;
  for (n = node.firstElementChild; n; n = n.nextElementSibling) {
    var parsers = parsersNS[n.namespaceURI];
    if (parsers !== undefined) {
      var parser = parsers[n.localName];
      if (parser !== undefined) {
        parser.call(opt_this, n, objectStack);
      }
    }
  }
};


/**
 * Push an object on top of the stack, parse and return the popped object.
 * @param {T} object Object.
 * @param {Object.<string, Object.<string, ol.XmlParser>>} parsersNS
 *     Parsers by namespace.
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @param {*=} opt_this The object to use as `this`.
 * @return {T} Object.
 * @template T
 */
ol.xml.pushParseAndPop = function(
    object, parsersNS, node, objectStack, opt_this) {
  objectStack.push(object);
  ol.xml.parseNode(parsersNS, node, objectStack, opt_this);
  return objectStack.pop();
};


/**
 * Walk through an array of `values` and call a serializer for each value.
 * @param {Object.<string, Object.<string, ol.XmlSerializer>>} serializersNS
 *     Namespaced serializers.
 * @param {function(this: T, *, Array.<*>, (string|undefined)): (Node|undefined)} nodeFactory
 *     Node factory. The `nodeFactory` creates the node whose namespace and name
 *     will be used to choose a node writer from `serializersNS`. This
 *     separation allows us to decide what kind of node to create, depending on
 *     the value we want to serialize. An example for this would be different
 *     geometry writers based on the geometry type.
 * @param {Array.<*>} values Values to serialize. An example would be an array
 *     of {@link ol.Feature} instances.
 * @param {Array.<*>} objectStack Node stack.
 * @param {Array.<string>=} opt_keys Keys of the `values`. Will be passed to the
 *     `nodeFactory`. This is used for serializing object literals where the
 *     node name relates to the property key. The array length of `opt_keys` has
 *     to match the length of `values`. For serializing a sequence, `opt_keys`
 *     determines the order of the sequence.
 * @param {T=} opt_this The object to use as `this` for the node factory and
 *     serializers.
 * @template T
 */
ol.xml.serialize = function(
    serializersNS, nodeFactory, values, objectStack, opt_keys, opt_this) {
  var length = (opt_keys !== undefined ? opt_keys : values).length;
  var value, node;
  for (var i = 0; i < length; ++i) {
    value = values[i];
    if (value !== undefined) {
      node = nodeFactory.call(opt_this, value, objectStack,
          opt_keys !== undefined ? opt_keys[i] : undefined);
      if (node !== undefined) {
        serializersNS[node.namespaceURI][node.localName]
            .call(opt_this, node, value, objectStack);
      }
    }
  }
};


/**
 * @param {O} object Object.
 * @param {Object.<string, Object.<string, ol.XmlSerializer>>} serializersNS
 *     Namespaced serializers.
 * @param {function(this: T, *, Array.<*>, (string|undefined)): (Node|undefined)} nodeFactory
 *     Node factory. The `nodeFactory` creates the node whose namespace and name
 *     will be used to choose a node writer from `serializersNS`. This
 *     separation allows us to decide what kind of node to create, depending on
 *     the value we want to serialize. An example for this would be different
 *     geometry writers based on the geometry type.
 * @param {Array.<*>} values Values to serialize. An example would be an array
 *     of {@link ol.Feature} instances.
 * @param {Array.<*>} objectStack Node stack.
 * @param {Array.<string>=} opt_keys Keys of the `values`. Will be passed to the
 *     `nodeFactory`. This is used for serializing object literals where the
 *     node name relates to the property key. The array length of `opt_keys` has
 *     to match the length of `values`. For serializing a sequence, `opt_keys`
 *     determines the order of the sequence.
 * @param {T=} opt_this The object to use as `this` for the node factory and
 *     serializers.
 * @return {O|undefined} Object.
 * @template O, T
 */
ol.xml.pushSerializeAndPop = function(object,
    serializersNS, nodeFactory, values, objectStack, opt_keys, opt_this) {
  objectStack.push(object);
  ol.xml.serialize(
      serializersNS, nodeFactory, values, objectStack, opt_keys, opt_this);
  return objectStack.pop();
};

goog.provide('ol.featureloader');

goog.require('ol.Tile');
goog.require('ol.format.FormatType');
goog.require('ol.xml');


/**
 * @param {string|ol.FeatureUrlFunction} url Feature URL service.
 * @param {ol.format.Feature} format Feature format.
 * @param {function(this:ol.VectorTile, Array.<ol.Feature>, ol.proj.Projection)|function(this:ol.source.Vector, Array.<ol.Feature>)} success
 *     Function called with the loaded features and optionally with the data
 *     projection. Called with the vector tile or source as `this`.
 * @param {function(this:ol.VectorTile)|function(this:ol.source.Vector)} failure
 *     Function called when loading failed. Called with the vector tile or
 *     source as `this`.
 * @return {ol.FeatureLoader} The feature loader.
 */
ol.featureloader.loadFeaturesXhr = function(url, format, success, failure) {
  return (
      /**
       * @param {ol.Extent} extent Extent.
       * @param {number} resolution Resolution.
       * @param {ol.proj.Projection} projection Projection.
       * @this {ol.source.Vector|ol.VectorTile}
       */
      function(extent, resolution, projection) {
        var xhr = new XMLHttpRequest();
        xhr.open('GET',
            typeof url === 'function' ? url(extent, resolution, projection) : url,
            true);
        if (format.getType() == ol.format.FormatType.ARRAY_BUFFER) {
          xhr.responseType = 'arraybuffer';
        }
        /**
         * @param {Event} event Event.
         * @private
         */
        xhr.onload = function(event) {
          // status will be 0 for file:// urls
          if (!xhr.status || xhr.status >= 200 && xhr.status < 300) {
            var type = format.getType();
            /** @type {Document|Node|Object|string|undefined} */
            var source;
            if (type == ol.format.FormatType.JSON ||
                type == ol.format.FormatType.TEXT) {
              source = xhr.responseText;
            } else if (type == ol.format.FormatType.XML) {
              source = xhr.responseXML;
              if (!source) {
                source = ol.xml.parse(xhr.responseText);
              }
            } else if (type == ol.format.FormatType.ARRAY_BUFFER) {
              source = /** @type {ArrayBuffer} */ (xhr.response);
            }
            if (source) {
              success.call(this, format.readFeatures(source,
                  {featureProjection: projection}),
                  format.readProjection(source));
            } else {
              failure.call(this);
            }
          } else {
            failure.call(this);
          }
        }.bind(this);
        xhr.send();
      });
};


/**
 * Create an XHR feature loader for a `url` and `format`. The feature loader
 * loads features (with XHR), parses the features, and adds them to the
 * vector tile.
 * @param {string|ol.FeatureUrlFunction} url Feature URL service.
 * @param {ol.format.Feature} format Feature format.
 * @return {ol.FeatureLoader} The feature loader.
 * @api
 */
ol.featureloader.tile = function(url, format) {
  return ol.featureloader.loadFeaturesXhr(url, format,
      /**
       * @param {Array.<ol.Feature>} features The loaded features.
       * @param {ol.proj.Projection} dataProjection Data projection.
       * @this {ol.VectorTile}
       */
      function(features, dataProjection) {
        this.setProjection(dataProjection);
        this.setFeatures(features);
      },
      /**
       * @this {ol.VectorTile}
       */
      function() {
        this.setState(ol.Tile.State.ERROR);
      });
};


/**
 * Create an XHR feature loader for a `url` and `format`. The feature loader
 * loads features (with XHR), parses the features, and adds them to the
 * vector source.
 * @param {string|ol.FeatureUrlFunction} url Feature URL service.
 * @param {ol.format.Feature} format Feature format.
 * @return {ol.FeatureLoader} The feature loader.
 * @api
 */
ol.featureloader.xhr = function(url, format) {
  return ol.featureloader.loadFeaturesXhr(url, format,
      /**
       * @param {Array.<ol.Feature>} features The loaded features.
       * @param {ol.proj.Projection} dataProjection Data projection.
       * @this {ol.source.Vector}
       */
      function(features, dataProjection) {
        this.addFeatures(features);
      }, /* FIXME handle error */ ol.nullFunction);
};

goog.provide('ol.format.Feature');

goog.require('ol.geom.Geometry');
goog.require('ol.proj');


/**
 * @classdesc
 * Abstract base class; normally only used for creating subclasses and not
 * instantiated in apps.
 * Base class for feature formats.
 * {ol.format.Feature} subclasses provide the ability to decode and encode
 * {@link ol.Feature} objects from a variety of commonly used geospatial
 * file formats.  See the documentation for each format for more details.
 *
 * @constructor
 * @api stable
 */
ol.format.Feature = function() {

  /**
   * @protected
   * @type {ol.proj.Projection}
   */
  this.defaultDataProjection = null;

};


/**
 * @abstract
 * @return {Array.<string>} Extensions.
 */
ol.format.Feature.prototype.getExtensions = function() {};


/**
 * Adds the data projection to the read options.
 * @param {Document|Node|Object|string} source Source.
 * @param {olx.format.ReadOptions=} opt_options Options.
 * @return {olx.format.ReadOptions|undefined} Options.
 * @protected
 */
ol.format.Feature.prototype.getReadOptions = function(source, opt_options) {
  var options;
  if (opt_options) {
    options = {
      dataProjection: opt_options.dataProjection ?
          opt_options.dataProjection : this.readProjection(source),
      featureProjection: opt_options.featureProjection
    };
  }
  return this.adaptOptions(options);
};


/**
 * Sets the `defaultDataProjection` on the options, if no `dataProjection`
 * is set.
 * @param {olx.format.WriteOptions|olx.format.ReadOptions|undefined} options
 *     Options.
 * @protected
 * @return {olx.format.WriteOptions|olx.format.ReadOptions|undefined}
 *     Updated options.
 */
ol.format.Feature.prototype.adaptOptions = function(options) {
  var updatedOptions;
  if (options) {
    updatedOptions = {
      featureProjection: options.featureProjection,
      dataProjection: options.dataProjection ?
          options.dataProjection : this.defaultDataProjection,
      rightHanded: options.rightHanded
    };
    if (options.decimals) {
      updatedOptions.decimals = options.decimals;
    }
  }
  return updatedOptions;
};


/**
 * @abstract
 * @return {ol.format.FormatType} Format.
 */
ol.format.Feature.prototype.getType = function() {};


/**
 * Read a single feature from a source.
 *
 * @abstract
 * @param {Document|Node|Object|string} source Source.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @return {ol.Feature} Feature.
 */
ol.format.Feature.prototype.readFeature = function(source, opt_options) {};


/**
 * Read all features from a source.
 *
 * @abstract
 * @param {Document|Node|ArrayBuffer|Object|string} source Source.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @return {Array.<ol.Feature>} Features.
 */
ol.format.Feature.prototype.readFeatures = function(source, opt_options) {};


/**
 * Read a single geometry from a source.
 *
 * @abstract
 * @param {Document|Node|Object|string} source Source.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @return {ol.geom.Geometry} Geometry.
 */
ol.format.Feature.prototype.readGeometry = function(source, opt_options) {};


/**
 * Read the projection from a source.
 *
 * @abstract
 * @param {Document|Node|Object|string} source Source.
 * @return {ol.proj.Projection} Projection.
 */
ol.format.Feature.prototype.readProjection = function(source) {};


/**
 * Encode a feature in this format.
 *
 * @abstract
 * @param {ol.Feature} feature Feature.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @return {string} Result.
 */
ol.format.Feature.prototype.writeFeature = function(feature, opt_options) {};


/**
 * Encode an array of features in this format.
 *
 * @abstract
 * @param {Array.<ol.Feature>} features Features.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @return {string} Result.
 */
ol.format.Feature.prototype.writeFeatures = function(features, opt_options) {};


/**
 * Write a single geometry in this format.
 *
 * @abstract
 * @param {ol.geom.Geometry} geometry Geometry.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @return {string} Result.
 */
ol.format.Feature.prototype.writeGeometry = function(geometry, opt_options) {};


/**
 * @param {ol.geom.Geometry|ol.Extent} geometry Geometry.
 * @param {boolean} write Set to true for writing, false for reading.
 * @param {(olx.format.WriteOptions|olx.format.ReadOptions)=} opt_options
 *     Options.
 * @return {ol.geom.Geometry|ol.Extent} Transformed geometry.
 * @protected
 */
ol.format.Feature.transformWithOptions = function(
    geometry, write, opt_options) {
  var featureProjection = opt_options ?
      ol.proj.get(opt_options.featureProjection) : null;
  var dataProjection = opt_options ?
      ol.proj.get(opt_options.dataProjection) : null;
  /**
   * @type {ol.geom.Geometry|ol.Extent}
   */
  var transformed;
  if (featureProjection && dataProjection &&
      !ol.proj.equivalent(featureProjection, dataProjection)) {
    if (geometry instanceof ol.geom.Geometry) {
      transformed = (write ? geometry.clone() : geometry).transform(
          write ? featureProjection : dataProjection,
          write ? dataProjection : featureProjection);
    } else {
      // FIXME this is necessary because ol.format.GML treats extents
      // as geometries
      transformed = ol.proj.transformExtent(
          write ? geometry.slice() : geometry,
          write ? featureProjection : dataProjection,
          write ? dataProjection : featureProjection);
    }
  } else {
    transformed = geometry;
  }
  if (write && opt_options && opt_options.decimals) {
    var power = Math.pow(10, opt_options.decimals);
    // if decimals option on write, round each coordinate appropriately
    /**
     * @param {Array.<number>} coordinates Coordinates.
     * @return {Array.<number>} Transformed coordinates.
     */
    var transform = function(coordinates) {
      for (var i = 0, ii = coordinates.length; i < ii; ++i) {
        coordinates[i] = Math.round(coordinates[i] * power) / power;
      }
      return coordinates;
    };
    if (Array.isArray(transformed)) {
      transform(transformed);
    } else {
      transformed.applyTransform(transform);
    }
  }
  return transformed;
};

goog.provide('ol.format.JSONFeature');

goog.require('ol');
goog.require('ol.format.Feature');
goog.require('ol.format.FormatType');


/**
 * @classdesc
 * Abstract base class; normally only used for creating subclasses and not
 * instantiated in apps.
 * Base class for JSON feature formats.
 *
 * @constructor
 * @extends {ol.format.Feature}
 */
ol.format.JSONFeature = function() {
  ol.format.Feature.call(this);
};
ol.inherits(ol.format.JSONFeature, ol.format.Feature);


/**
 * @param {Document|Node|Object|string} source Source.
 * @private
 * @return {Object} Object.
 */
ol.format.JSONFeature.prototype.getObject_ = function(source) {
  if (typeof source === 'string') {
    var object = JSON.parse(source);
    return object ? /** @type {Object} */ (object) : null;
  } else if (source !== null) {
    return source;
  } else {
    return null;
  }
};


/**
 * @inheritDoc
 */
ol.format.JSONFeature.prototype.getType = function() {
  return ol.format.FormatType.JSON;
};


/**
 * @inheritDoc
 */
ol.format.JSONFeature.prototype.readFeature = function(source, opt_options) {
  return this.readFeatureFromObject(
      this.getObject_(source), this.getReadOptions(source, opt_options));
};


/**
 * @inheritDoc
 */
ol.format.JSONFeature.prototype.readFeatures = function(source, opt_options) {
  return this.readFeaturesFromObject(
      this.getObject_(source), this.getReadOptions(source, opt_options));
};


/**
 * @abstract
 * @param {Object} object Object.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @protected
 * @return {ol.Feature} Feature.
 */
ol.format.JSONFeature.prototype.readFeatureFromObject = function(object, opt_options) {};


/**
 * @abstract
 * @param {Object} object Object.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @protected
 * @return {Array.<ol.Feature>} Features.
 */
ol.format.JSONFeature.prototype.readFeaturesFromObject = function(object, opt_options) {};


/**
 * @inheritDoc
 */
ol.format.JSONFeature.prototype.readGeometry = function(source, opt_options) {
  return this.readGeometryFromObject(
      this.getObject_(source), this.getReadOptions(source, opt_options));
};


/**
 * @abstract
 * @param {Object} object Object.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @protected
 * @return {ol.geom.Geometry} Geometry.
 */
ol.format.JSONFeature.prototype.readGeometryFromObject = function(object, opt_options) {};


/**
 * @inheritDoc
 */
ol.format.JSONFeature.prototype.readProjection = function(source) {
  return this.readProjectionFromObject(this.getObject_(source));
};


/**
 * @abstract
 * @param {Object} object Object.
 * @protected
 * @return {ol.proj.Projection} Projection.
 */
ol.format.JSONFeature.prototype.readProjectionFromObject = function(object) {};


/**
 * @inheritDoc
 */
ol.format.JSONFeature.prototype.writeFeature = function(feature, opt_options) {
  return JSON.stringify(this.writeFeatureObject(feature, opt_options));
};


/**
 * @abstract
 * @param {ol.Feature} feature Feature.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @return {Object} Object.
 */
ol.format.JSONFeature.prototype.writeFeatureObject = function(feature, opt_options) {};


/**
 * @inheritDoc
 */
ol.format.JSONFeature.prototype.writeFeatures = function(features, opt_options) {
  return JSON.stringify(this.writeFeaturesObject(features, opt_options));
};


/**
 * @abstract
 * @param {Array.<ol.Feature>} features Features.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @return {Object} Object.
 */
ol.format.JSONFeature.prototype.writeFeaturesObject = function(features, opt_options) {};


/**
 * @inheritDoc
 */
ol.format.JSONFeature.prototype.writeGeometry = function(geometry, opt_options) {
  return JSON.stringify(this.writeGeometryObject(geometry, opt_options));
};


/**
 * @abstract
 * @param {ol.geom.Geometry} geometry Geometry.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @return {Object} Object.
 */
ol.format.JSONFeature.prototype.writeGeometryObject = function(geometry, opt_options) {};

goog.provide('ol.geom.flat.interpolate');

goog.require('ol.array');
goog.require('ol.math');


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @param {number} fraction Fraction.
 * @param {Array.<number>=} opt_dest Destination.
 * @return {Array.<number>} Destination.
 */
ol.geom.flat.interpolate.lineString = function(flatCoordinates, offset, end, stride, fraction, opt_dest) {
  // FIXME does not work when vertices are repeated
  // FIXME interpolate extra dimensions
  goog.DEBUG && console.assert(0 <= fraction && fraction <= 1,
      'fraction should be in between 0 and 1');
  var pointX = NaN;
  var pointY = NaN;
  var n = (end - offset) / stride;
  if (n === 0) {
    goog.DEBUG && console.assert(false, 'n cannot be 0');
  } else if (n == 1) {
    pointX = flatCoordinates[offset];
    pointY = flatCoordinates[offset + 1];
  } else if (n == 2) {
    pointX = (1 - fraction) * flatCoordinates[offset] +
        fraction * flatCoordinates[offset + stride];
    pointY = (1 - fraction) * flatCoordinates[offset + 1] +
        fraction * flatCoordinates[offset + stride + 1];
  } else {
    var x1 = flatCoordinates[offset];
    var y1 = flatCoordinates[offset + 1];
    var length = 0;
    var cumulativeLengths = [0];
    var i;
    for (i = offset + stride; i < end; i += stride) {
      var x2 = flatCoordinates[i];
      var y2 = flatCoordinates[i + 1];
      length += Math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1));
      cumulativeLengths.push(length);
      x1 = x2;
      y1 = y2;
    }
    var target = fraction * length;
    var index = ol.array.binarySearch(cumulativeLengths, target);
    if (index < 0) {
      var t = (target - cumulativeLengths[-index - 2]) /
          (cumulativeLengths[-index - 1] - cumulativeLengths[-index - 2]);
      var o = offset + (-index - 2) * stride;
      pointX = ol.math.lerp(
          flatCoordinates[o], flatCoordinates[o + stride], t);
      pointY = ol.math.lerp(
          flatCoordinates[o + 1], flatCoordinates[o + stride + 1], t);
    } else {
      pointX = flatCoordinates[offset + index * stride];
      pointY = flatCoordinates[offset + index * stride + 1];
    }
  }
  if (opt_dest) {
    opt_dest[0] = pointX;
    opt_dest[1] = pointY;
    return opt_dest;
  } else {
    return [pointX, pointY];
  }
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @param {number} m M.
 * @param {boolean} extrapolate Extrapolate.
 * @return {ol.Coordinate} Coordinate.
 */
ol.geom.flat.lineStringCoordinateAtM = function(flatCoordinates, offset, end, stride, m, extrapolate) {
  if (end == offset) {
    return null;
  }
  var coordinate;
  if (m < flatCoordinates[offset + stride - 1]) {
    if (extrapolate) {
      coordinate = flatCoordinates.slice(offset, offset + stride);
      coordinate[stride - 1] = m;
      return coordinate;
    } else {
      return null;
    }
  } else if (flatCoordinates[end - 1] < m) {
    if (extrapolate) {
      coordinate = flatCoordinates.slice(end - stride, end);
      coordinate[stride - 1] = m;
      return coordinate;
    } else {
      return null;
    }
  }
  // FIXME use O(1) search
  if (m == flatCoordinates[offset + stride - 1]) {
    return flatCoordinates.slice(offset, offset + stride);
  }
  var lo = offset / stride;
  var hi = end / stride;
  while (lo < hi) {
    var mid = (lo + hi) >> 1;
    if (m < flatCoordinates[(mid + 1) * stride - 1]) {
      hi = mid;
    } else {
      lo = mid + 1;
    }
  }
  var m0 = flatCoordinates[lo * stride - 1];
  if (m == m0) {
    return flatCoordinates.slice((lo - 1) * stride, (lo - 1) * stride + stride);
  }
  var m1 = flatCoordinates[(lo + 1) * stride - 1];
  goog.DEBUG && console.assert(m0 < m, 'm0 should be less than m');
  goog.DEBUG && console.assert(m <= m1, 'm should be less than or equal to m1');
  var t = (m - m0) / (m1 - m0);
  coordinate = [];
  var i;
  for (i = 0; i < stride - 1; ++i) {
    coordinate.push(ol.math.lerp(flatCoordinates[(lo - 1) * stride + i],
        flatCoordinates[lo * stride + i], t));
  }
  coordinate.push(m);
  goog.DEBUG && console.assert(coordinate.length == stride,
      'length of coordinate array should match stride');
  return coordinate;
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array.<number>} ends Ends.
 * @param {number} stride Stride.
 * @param {number} m M.
 * @param {boolean} extrapolate Extrapolate.
 * @param {boolean} interpolate Interpolate.
 * @return {ol.Coordinate} Coordinate.
 */
ol.geom.flat.lineStringsCoordinateAtM = function(
    flatCoordinates, offset, ends, stride, m, extrapolate, interpolate) {
  if (interpolate) {
    return ol.geom.flat.lineStringCoordinateAtM(
        flatCoordinates, offset, ends[ends.length - 1], stride, m, extrapolate);
  }
  var coordinate;
  if (m < flatCoordinates[stride - 1]) {
    if (extrapolate) {
      coordinate = flatCoordinates.slice(0, stride);
      coordinate[stride - 1] = m;
      return coordinate;
    } else {
      return null;
    }
  }
  if (flatCoordinates[flatCoordinates.length - 1] < m) {
    if (extrapolate) {
      coordinate = flatCoordinates.slice(flatCoordinates.length - stride);
      coordinate[stride - 1] = m;
      return coordinate;
    } else {
      return null;
    }
  }
  var i, ii;
  for (i = 0, ii = ends.length; i < ii; ++i) {
    var end = ends[i];
    if (offset == end) {
      continue;
    }
    if (m < flatCoordinates[offset + stride - 1]) {
      return null;
    } else if (m <= flatCoordinates[end - 1]) {
      return ol.geom.flat.lineStringCoordinateAtM(
          flatCoordinates, offset, end, stride, m, false);
    }
    offset = end;
  }
  goog.DEBUG && console.assert(false,
      'ol.geom.flat.lineStringsCoordinateAtM should have returned');
  return null;
};

goog.provide('ol.geom.flat.length');


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @return {number} Length.
 */
ol.geom.flat.length.lineString = function(flatCoordinates, offset, end, stride) {
  var x1 = flatCoordinates[offset];
  var y1 = flatCoordinates[offset + 1];
  var length = 0;
  var i;
  for (i = offset + stride; i < end; i += stride) {
    var x2 = flatCoordinates[i];
    var y2 = flatCoordinates[i + 1];
    length += Math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1));
    x1 = x2;
    y1 = y2;
  }
  return length;
};


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @return {number} Perimeter.
 */
ol.geom.flat.length.linearRing = function(flatCoordinates, offset, end, stride) {
  var perimeter =
      ol.geom.flat.length.lineString(flatCoordinates, offset, end, stride);
  var dx = flatCoordinates[end - stride] - flatCoordinates[offset];
  var dy = flatCoordinates[end - stride + 1] - flatCoordinates[offset + 1];
  perimeter += Math.sqrt(dx * dx + dy * dy);
  return perimeter;
};

goog.provide('ol.geom.LineString');

goog.require('ol');
goog.require('ol.array');
goog.require('ol.extent');
goog.require('ol.geom.GeometryLayout');
goog.require('ol.geom.GeometryType');
goog.require('ol.geom.SimpleGeometry');
goog.require('ol.geom.flat.closest');
goog.require('ol.geom.flat.deflate');
goog.require('ol.geom.flat.inflate');
goog.require('ol.geom.flat.interpolate');
goog.require('ol.geom.flat.intersectsextent');
goog.require('ol.geom.flat.length');
goog.require('ol.geom.flat.segments');
goog.require('ol.geom.flat.simplify');


/**
 * @classdesc
 * Linestring geometry.
 *
 * @constructor
 * @extends {ol.geom.SimpleGeometry}
 * @param {Array.<ol.Coordinate>} coordinates Coordinates.
 * @param {ol.geom.GeometryLayout=} opt_layout Layout.
 * @api stable
 */
ol.geom.LineString = function(coordinates, opt_layout) {

  ol.geom.SimpleGeometry.call(this);

  /**
   * @private
   * @type {ol.Coordinate}
   */
  this.flatMidpoint_ = null;

  /**
   * @private
   * @type {number}
   */
  this.flatMidpointRevision_ = -1;

  /**
   * @private
   * @type {number}
   */
  this.maxDelta_ = -1;

  /**
   * @private
   * @type {number}
   */
  this.maxDeltaRevision_ = -1;

  this.setCoordinates(coordinates, opt_layout);

};
ol.inherits(ol.geom.LineString, ol.geom.SimpleGeometry);


/**
 * Append the passed coordinate to the coordinates of the linestring.
 * @param {ol.Coordinate} coordinate Coordinate.
 * @api stable
 */
ol.geom.LineString.prototype.appendCoordinate = function(coordinate) {
  goog.DEBUG && console.assert(coordinate.length == this.stride,
      'length of coordinate array should match stride');
  if (!this.flatCoordinates) {
    this.flatCoordinates = coordinate.slice();
  } else {
    ol.array.extend(this.flatCoordinates, coordinate);
  }
  this.changed();
};


/**
 * Make a complete copy of the geometry.
 * @return {!ol.geom.LineString} Clone.
 * @api stable
 */
ol.geom.LineString.prototype.clone = function() {
  var lineString = new ol.geom.LineString(null);
  lineString.setFlatCoordinates(this.layout, this.flatCoordinates.slice());
  return lineString;
};


/**
 * @inheritDoc
 */
ol.geom.LineString.prototype.closestPointXY = function(x, y, closestPoint, minSquaredDistance) {
  if (minSquaredDistance <
      ol.extent.closestSquaredDistanceXY(this.getExtent(), x, y)) {
    return minSquaredDistance;
  }
  if (this.maxDeltaRevision_ != this.getRevision()) {
    this.maxDelta_ = Math.sqrt(ol.geom.flat.closest.getMaxSquaredDelta(
        this.flatCoordinates, 0, this.flatCoordinates.length, this.stride, 0));
    this.maxDeltaRevision_ = this.getRevision();
  }
  return ol.geom.flat.closest.getClosestPoint(
      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,
      this.maxDelta_, false, x, y, closestPoint, minSquaredDistance);
};


/**
 * Iterate over each segment, calling the provided callback.
 * If the callback returns a truthy value the function returns that
 * value immediately. Otherwise the function returns `false`.
 *
 * @param {function(this: S, ol.Coordinate, ol.Coordinate): T} callback Function
 *     called for each segment.
 * @param {S=} opt_this The object to be used as the value of 'this'
 *     within callback.
 * @return {T|boolean} Value.
 * @template T,S
 * @api
 */
ol.geom.LineString.prototype.forEachSegment = function(callback, opt_this) {
  return ol.geom.flat.segments.forEach(this.flatCoordinates, 0,
      this.flatCoordinates.length, this.stride, callback, opt_this);
};


/**
 * Returns the coordinate at `m` using linear interpolation, or `null` if no
 * such coordinate exists.
 *
 * `opt_extrapolate` controls extrapolation beyond the range of Ms in the
 * MultiLineString. If `opt_extrapolate` is `true` then Ms less than the first
 * M will return the first coordinate and Ms greater than the last M will
 * return the last coordinate.
 *
 * @param {number} m M.
 * @param {boolean=} opt_extrapolate Extrapolate. Default is `false`.
 * @return {ol.Coordinate} Coordinate.
 * @api stable
 */
ol.geom.LineString.prototype.getCoordinateAtM = function(m, opt_extrapolate) {
  if (this.layout != ol.geom.GeometryLayout.XYM &&
      this.layout != ol.geom.GeometryLayout.XYZM) {
    return null;
  }
  var extrapolate = opt_extrapolate !== undefined ? opt_extrapolate : false;
  return ol.geom.flat.lineStringCoordinateAtM(this.flatCoordinates, 0,
      this.flatCoordinates.length, this.stride, m, extrapolate);
};


/**
 * Return the coordinates of the linestring.
 * @return {Array.<ol.Coordinate>} Coordinates.
 * @api stable
 */
ol.geom.LineString.prototype.getCoordinates = function() {
  return ol.geom.flat.inflate.coordinates(
      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride);
};


/**
 * Return the coordinate at the provided fraction along the linestring.
 * The `fraction` is a number between 0 and 1, where 0 is the start of the
 * linestring and 1 is the end.
 * @param {number} fraction Fraction.
 * @param {ol.Coordinate=} opt_dest Optional coordinate whose values will
 *     be modified. If not provided, a new coordinate will be returned.
 * @return {ol.Coordinate} Coordinate of the interpolated point.
 * @api
 */
ol.geom.LineString.prototype.getCoordinateAt = function(fraction, opt_dest) {
  return ol.geom.flat.interpolate.lineString(
      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,
      fraction, opt_dest);
};


/**
 * Return the length of the linestring on projected plane.
 * @return {number} Length (on projected plane).
 * @api stable
 */
ol.geom.LineString.prototype.getLength = function() {
  return ol.geom.flat.length.lineString(
      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride);
};


/**
 * @return {Array.<number>} Flat midpoint.
 */
ol.geom.LineString.prototype.getFlatMidpoint = function() {
  if (this.flatMidpointRevision_ != this.getRevision()) {
    this.flatMidpoint_ = this.getCoordinateAt(0.5, this.flatMidpoint_);
    this.flatMidpointRevision_ = this.getRevision();
  }
  return this.flatMidpoint_;
};


/**
 * @inheritDoc
 */
ol.geom.LineString.prototype.getSimplifiedGeometryInternal = function(squaredTolerance) {
  var simplifiedFlatCoordinates = [];
  simplifiedFlatCoordinates.length = ol.geom.flat.simplify.douglasPeucker(
      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,
      squaredTolerance, simplifiedFlatCoordinates, 0);
  var simplifiedLineString = new ol.geom.LineString(null);
  simplifiedLineString.setFlatCoordinates(
      ol.geom.GeometryLayout.XY, simplifiedFlatCoordinates);
  return simplifiedLineString;
};


/**
 * @inheritDoc
 * @api stable
 */
ol.geom.LineString.prototype.getType = function() {
  return ol.geom.GeometryType.LINE_STRING;
};


/**
 * @inheritDoc
 * @api stable
 */
ol.geom.LineString.prototype.intersectsExtent = function(extent) {
  return ol.geom.flat.intersectsextent.lineString(
      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,
      extent);
};


/**
 * Set the coordinates of the linestring.
 * @param {Array.<ol.Coordinate>} coordinates Coordinates.
 * @param {ol.geom.GeometryLayout=} opt_layout Layout.
 * @api stable
 */
ol.geom.LineString.prototype.setCoordinates = function(coordinates, opt_layout) {
  if (!coordinates) {
    this.setFlatCoordinates(ol.geom.GeometryLayout.XY, null);
  } else {
    this.setLayout(opt_layout, coordinates, 1);
    if (!this.flatCoordinates) {
      this.flatCoordinates = [];
    }
    this.flatCoordinates.length = ol.geom.flat.deflate.coordinates(
        this.flatCoordinates, 0, coordinates, this.stride);
    this.changed();
  }
};


/**
 * @param {ol.geom.GeometryLayout} layout Layout.
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 */
ol.geom.LineString.prototype.setFlatCoordinates = function(layout, flatCoordinates) {
  this.setFlatCoordinatesInternal(layout, flatCoordinates);
  this.changed();
};

goog.provide('ol.geom.MultiLineString');

goog.require('ol');
goog.require('ol.array');
goog.require('ol.extent');
goog.require('ol.geom.GeometryLayout');
goog.require('ol.geom.GeometryType');
goog.require('ol.geom.LineString');
goog.require('ol.geom.SimpleGeometry');
goog.require('ol.geom.flat.closest');
goog.require('ol.geom.flat.deflate');
goog.require('ol.geom.flat.inflate');
goog.require('ol.geom.flat.interpolate');
goog.require('ol.geom.flat.intersectsextent');
goog.require('ol.geom.flat.simplify');


/**
 * @classdesc
 * Multi-linestring geometry.
 *
 * @constructor
 * @extends {ol.geom.SimpleGeometry}
 * @param {Array.<Array.<ol.Coordinate>>} coordinates Coordinates.
 * @param {ol.geom.GeometryLayout=} opt_layout Layout.
 * @api stable
 */
ol.geom.MultiLineString = function(coordinates, opt_layout) {

  ol.geom.SimpleGeometry.call(this);

  /**
   * @type {Array.<number>}
   * @private
   */
  this.ends_ = [];

  /**
   * @private
   * @type {number}
   */
  this.maxDelta_ = -1;

  /**
   * @private
   * @type {number}
   */
  this.maxDeltaRevision_ = -1;

  this.setCoordinates(coordinates, opt_layout);

};
ol.inherits(ol.geom.MultiLineString, ol.geom.SimpleGeometry);


/**
 * Append the passed linestring to the multilinestring.
 * @param {ol.geom.LineString} lineString LineString.
 * @api stable
 */
ol.geom.MultiLineString.prototype.appendLineString = function(lineString) {
  goog.DEBUG && console.assert(lineString.getLayout() == this.layout,
      'layout of lineString should match the layout');
  if (!this.flatCoordinates) {
    this.flatCoordinates = lineString.getFlatCoordinates().slice();
  } else {
    ol.array.extend(
        this.flatCoordinates, lineString.getFlatCoordinates().slice());
  }
  this.ends_.push(this.flatCoordinates.length);
  this.changed();
};


/**
 * Make a complete copy of the geometry.
 * @return {!ol.geom.MultiLineString} Clone.
 * @api stable
 */
ol.geom.MultiLineString.prototype.clone = function() {
  var multiLineString = new ol.geom.MultiLineString(null);
  multiLineString.setFlatCoordinates(
      this.layout, this.flatCoordinates.slice(), this.ends_.slice());
  return multiLineString;
};


/**
 * @inheritDoc
 */
ol.geom.MultiLineString.prototype.closestPointXY = function(x, y, closestPoint, minSquaredDistance) {
  if (minSquaredDistance <
      ol.extent.closestSquaredDistanceXY(this.getExtent(), x, y)) {
    return minSquaredDistance;
  }
  if (this.maxDeltaRevision_ != this.getRevision()) {
    this.maxDelta_ = Math.sqrt(ol.geom.flat.closest.getsMaxSquaredDelta(
        this.flatCoordinates, 0, this.ends_, this.stride, 0));
    this.maxDeltaRevision_ = this.getRevision();
  }
  return ol.geom.flat.closest.getsClosestPoint(
      this.flatCoordinates, 0, this.ends_, this.stride,
      this.maxDelta_, false, x, y, closestPoint, minSquaredDistance);
};


/**
 * Returns the coordinate at `m` using linear interpolation, or `null` if no
 * such coordinate exists.
 *
 * `opt_extrapolate` controls extrapolation beyond the range of Ms in the
 * MultiLineString. If `opt_extrapolate` is `true` then Ms less than the first
 * M will return the first coordinate and Ms greater than the last M will
 * return the last coordinate.
 *
 * `opt_interpolate` controls interpolation between consecutive LineStrings
 * within the MultiLineString. If `opt_interpolate` is `true` the coordinates
 * will be linearly interpolated between the last coordinate of one LineString
 * and the first coordinate of the next LineString.  If `opt_interpolate` is
 * `false` then the function will return `null` for Ms falling between
 * LineStrings.
 *
 * @param {number} m M.
 * @param {boolean=} opt_extrapolate Extrapolate. Default is `false`.
 * @param {boolean=} opt_interpolate Interpolate. Default is `false`.
 * @return {ol.Coordinate} Coordinate.
 * @api stable
 */
ol.geom.MultiLineString.prototype.getCoordinateAtM = function(m, opt_extrapolate, opt_interpolate) {
  if ((this.layout != ol.geom.GeometryLayout.XYM &&
       this.layout != ol.geom.GeometryLayout.XYZM) ||
      this.flatCoordinates.length === 0) {
    return null;
  }
  var extrapolate = opt_extrapolate !== undefined ? opt_extrapolate : false;
  var interpolate = opt_interpolate !== undefined ? opt_interpolate : false;
  return ol.geom.flat.lineStringsCoordinateAtM(this.flatCoordinates, 0,
      this.ends_, this.stride, m, extrapolate, interpolate);
};


/**
 * Return the coordinates of the multilinestring.
 * @return {Array.<Array.<ol.Coordinate>>} Coordinates.
 * @api stable
 */
ol.geom.MultiLineString.prototype.getCoordinates = function() {
  return ol.geom.flat.inflate.coordinatess(
      this.flatCoordinates, 0, this.ends_, this.stride);
};


/**
 * @return {Array.<number>} Ends.
 */
ol.geom.MultiLineString.prototype.getEnds = function() {
  return this.ends_;
};


/**
 * Return the linestring at the specified index.
 * @param {number} index Index.
 * @return {ol.geom.LineString} LineString.
 * @api stable
 */
ol.geom.MultiLineString.prototype.getLineString = function(index) {
  goog.DEBUG && console.assert(0 <= index && index < this.ends_.length,
      'index should be in between 0 and length of the this.ends_ array');
  if (index < 0 || this.ends_.length <= index) {
    return null;
  }
  var lineString = new ol.geom.LineString(null);
  lineString.setFlatCoordinates(this.layout, this.flatCoordinates.slice(
      index === 0 ? 0 : this.ends_[index - 1], this.ends_[index]));
  return lineString;
};


/**
 * Return the linestrings of this multilinestring.
 * @return {Array.<ol.geom.LineString>} LineStrings.
 * @api stable
 */
ol.geom.MultiLineString.prototype.getLineStrings = function() {
  var flatCoordinates = this.flatCoordinates;
  var ends = this.ends_;
  var layout = this.layout;
  /** @type {Array.<ol.geom.LineString>} */
  var lineStrings = [];
  var offset = 0;
  var i, ii;
  for (i = 0, ii = ends.length; i < ii; ++i) {
    var end = ends[i];
    var lineString = new ol.geom.LineString(null);
    lineString.setFlatCoordinates(layout, flatCoordinates.slice(offset, end));
    lineStrings.push(lineString);
    offset = end;
  }
  return lineStrings;
};


/**
 * @return {Array.<number>} Flat midpoints.
 */
ol.geom.MultiLineString.prototype.getFlatMidpoints = function() {
  var midpoints = [];
  var flatCoordinates = this.flatCoordinates;
  var offset = 0;
  var ends = this.ends_;
  var stride = this.stride;
  var i, ii;
  for (i = 0, ii = ends.length; i < ii; ++i) {
    var end = ends[i];
    var midpoint = ol.geom.flat.interpolate.lineString(
        flatCoordinates, offset, end, stride, 0.5);
    ol.array.extend(midpoints, midpoint);
    offset = end;
  }
  return midpoints;
};


/**
 * @inheritDoc
 */
ol.geom.MultiLineString.prototype.getSimplifiedGeometryInternal = function(squaredTolerance) {
  var simplifiedFlatCoordinates = [];
  var simplifiedEnds = [];
  simplifiedFlatCoordinates.length = ol.geom.flat.simplify.douglasPeuckers(
      this.flatCoordinates, 0, this.ends_, this.stride, squaredTolerance,
      simplifiedFlatCoordinates, 0, simplifiedEnds);
  var simplifiedMultiLineString = new ol.geom.MultiLineString(null);
  simplifiedMultiLineString.setFlatCoordinates(
      ol.geom.GeometryLayout.XY, simplifiedFlatCoordinates, simplifiedEnds);
  return simplifiedMultiLineString;
};


/**
 * @inheritDoc
 * @api stable
 */
ol.geom.MultiLineString.prototype.getType = function() {
  return ol.geom.GeometryType.MULTI_LINE_STRING;
};


/**
 * @inheritDoc
 * @api stable
 */
ol.geom.MultiLineString.prototype.intersectsExtent = function(extent) {
  return ol.geom.flat.intersectsextent.lineStrings(
      this.flatCoordinates, 0, this.ends_, this.stride, extent);
};


/**
 * Set the coordinates of the multilinestring.
 * @param {Array.<Array.<ol.Coordinate>>} coordinates Coordinates.
 * @param {ol.geom.GeometryLayout=} opt_layout Layout.
 * @api stable
 */
ol.geom.MultiLineString.prototype.setCoordinates = function(coordinates, opt_layout) {
  if (!coordinates) {
    this.setFlatCoordinates(ol.geom.GeometryLayout.XY, null, this.ends_);
  } else {
    this.setLayout(opt_layout, coordinates, 2);
    if (!this.flatCoordinates) {
      this.flatCoordinates = [];
    }
    var ends = ol.geom.flat.deflate.coordinatess(
        this.flatCoordinates, 0, coordinates, this.stride, this.ends_);
    this.flatCoordinates.length = ends.length === 0 ? 0 : ends[ends.length - 1];
    this.changed();
  }
};


/**
 * @param {ol.geom.GeometryLayout} layout Layout.
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {Array.<number>} ends Ends.
 */
ol.geom.MultiLineString.prototype.setFlatCoordinates = function(layout, flatCoordinates, ends) {
  if (!flatCoordinates) {
    goog.DEBUG && console.assert(ends && ends.length === 0,
        'ends must be truthy and ends.length should be 0');
  } else if (ends.length === 0) {
    goog.DEBUG && console.assert(flatCoordinates.length === 0,
        'flatCoordinates should be an empty array');
  } else {
    goog.DEBUG && console.assert(flatCoordinates.length == ends[ends.length - 1],
        'length of flatCoordinates array should match the last value of ends');
  }
  this.setFlatCoordinatesInternal(layout, flatCoordinates);
  this.ends_ = ends;
  this.changed();
};


/**
 * @param {Array.<ol.geom.LineString>} lineStrings LineStrings.
 */
ol.geom.MultiLineString.prototype.setLineStrings = function(lineStrings) {
  var layout = this.getLayout();
  var flatCoordinates = [];
  var ends = [];
  var i, ii;
  for (i = 0, ii = lineStrings.length; i < ii; ++i) {
    var lineString = lineStrings[i];
    if (i === 0) {
      layout = lineString.getLayout();
    } else {
      // FIXME better handle the case of non-matching layouts
      goog.DEBUG && console.assert(lineString.getLayout() == layout,
          'layout of lineString should match layout');
    }
    ol.array.extend(flatCoordinates, lineString.getFlatCoordinates());
    ends.push(flatCoordinates.length);
  }
  this.setFlatCoordinates(layout, flatCoordinates, ends);
};

goog.provide('ol.geom.MultiPoint');

goog.require('ol');
goog.require('ol.array');
goog.require('ol.extent');
goog.require('ol.geom.GeometryLayout');
goog.require('ol.geom.GeometryType');
goog.require('ol.geom.Point');
goog.require('ol.geom.SimpleGeometry');
goog.require('ol.geom.flat.deflate');
goog.require('ol.geom.flat.inflate');
goog.require('ol.math');


/**
 * @classdesc
 * Multi-point geometry.
 *
 * @constructor
 * @extends {ol.geom.SimpleGeometry}
 * @param {Array.<ol.Coordinate>} coordinates Coordinates.
 * @param {ol.geom.GeometryLayout=} opt_layout Layout.
 * @api stable
 */
ol.geom.MultiPoint = function(coordinates, opt_layout) {
  ol.geom.SimpleGeometry.call(this);
  this.setCoordinates(coordinates, opt_layout);
};
ol.inherits(ol.geom.MultiPoint, ol.geom.SimpleGeometry);


/**
 * Append the passed point to this multipoint.
 * @param {ol.geom.Point} point Point.
 * @api stable
 */
ol.geom.MultiPoint.prototype.appendPoint = function(point) {
  goog.DEBUG && console.assert(point.getLayout() == this.layout,
      'the layout of point should match layout');
  if (!this.flatCoordinates) {
    this.flatCoordinates = point.getFlatCoordinates().slice();
  } else {
    ol.array.extend(this.flatCoordinates, point.getFlatCoordinates());
  }
  this.changed();
};


/**
 * Make a complete copy of the geometry.
 * @return {!ol.geom.MultiPoint} Clone.
 * @api stable
 */
ol.geom.MultiPoint.prototype.clone = function() {
  var multiPoint = new ol.geom.MultiPoint(null);
  multiPoint.setFlatCoordinates(this.layout, this.flatCoordinates.slice());
  return multiPoint;
};


/**
 * @inheritDoc
 */
ol.geom.MultiPoint.prototype.closestPointXY = function(x, y, closestPoint, minSquaredDistance) {
  if (minSquaredDistance <
      ol.extent.closestSquaredDistanceXY(this.getExtent(), x, y)) {
    return minSquaredDistance;
  }
  var flatCoordinates = this.flatCoordinates;
  var stride = this.stride;
  var i, ii, j;
  for (i = 0, ii = flatCoordinates.length; i < ii; i += stride) {
    var squaredDistance = ol.math.squaredDistance(
        x, y, flatCoordinates[i], flatCoordinates[i + 1]);
    if (squaredDistance < minSquaredDistance) {
      minSquaredDistance = squaredDistance;
      for (j = 0; j < stride; ++j) {
        closestPoint[j] = flatCoordinates[i + j];
      }
      closestPoint.length = stride;
    }
  }
  return minSquaredDistance;
};


/**
 * Return the coordinates of the multipoint.
 * @return {Array.<ol.Coordinate>} Coordinates.
 * @api stable
 */
ol.geom.MultiPoint.prototype.getCoordinates = function() {
  return ol.geom.flat.inflate.coordinates(
      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride);
};


/**
 * Return the point at the specified index.
 * @param {number} index Index.
 * @return {ol.geom.Point} Point.
 * @api stable
 */
ol.geom.MultiPoint.prototype.getPoint = function(index) {
  var n = !this.flatCoordinates ?
      0 : this.flatCoordinates.length / this.stride;
  goog.DEBUG && console.assert(0 <= index && index < n,
      'index should be in between 0 and n');
  if (index < 0 || n <= index) {
    return null;
  }
  var point = new ol.geom.Point(null);
  point.setFlatCoordinates(this.layout, this.flatCoordinates.slice(
      index * this.stride, (index + 1) * this.stride));
  return point;
};


/**
 * Return the points of this multipoint.
 * @return {Array.<ol.geom.Point>} Points.
 * @api stable
 */
ol.geom.MultiPoint.prototype.getPoints = function() {
  var flatCoordinates = this.flatCoordinates;
  var layout = this.layout;
  var stride = this.stride;
  /** @type {Array.<ol.geom.Point>} */
  var points = [];
  var i, ii;
  for (i = 0, ii = flatCoordinates.length; i < ii; i += stride) {
    var point = new ol.geom.Point(null);
    point.setFlatCoordinates(layout, flatCoordinates.slice(i, i + stride));
    points.push(point);
  }
  return points;
};


/**
 * @inheritDoc
 * @api stable
 */
ol.geom.MultiPoint.prototype.getType = function() {
  return ol.geom.GeometryType.MULTI_POINT;
};


/**
 * @inheritDoc
 * @api stable
 */
ol.geom.MultiPoint.prototype.intersectsExtent = function(extent) {
  var flatCoordinates = this.flatCoordinates;
  var stride = this.stride;
  var i, ii, x, y;
  for (i = 0, ii = flatCoordinates.length; i < ii; i += stride) {
    x = flatCoordinates[i];
    y = flatCoordinates[i + 1];
    if (ol.extent.containsXY(extent, x, y)) {
      return true;
    }
  }
  return false;
};


/**
 * Set the coordinates of the multipoint.
 * @param {Array.<ol.Coordinate>} coordinates Coordinates.
 * @param {ol.geom.GeometryLayout=} opt_layout Layout.
 * @api stable
 */
ol.geom.MultiPoint.prototype.setCoordinates = function(coordinates, opt_layout) {
  if (!coordinates) {
    this.setFlatCoordinates(ol.geom.GeometryLayout.XY, null);
  } else {
    this.setLayout(opt_layout, coordinates, 1);
    if (!this.flatCoordinates) {
      this.flatCoordinates = [];
    }
    this.flatCoordinates.length = ol.geom.flat.deflate.coordinates(
        this.flatCoordinates, 0, coordinates, this.stride);
    this.changed();
  }
};


/**
 * @param {ol.geom.GeometryLayout} layout Layout.
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 */
ol.geom.MultiPoint.prototype.setFlatCoordinates = function(layout, flatCoordinates) {
  this.setFlatCoordinatesInternal(layout, flatCoordinates);
  this.changed();
};

goog.provide('ol.geom.flat.center');

goog.require('ol.extent');


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {Array.<Array.<number>>} endss Endss.
 * @param {number} stride Stride.
 * @return {Array.<number>} Flat centers.
 */
ol.geom.flat.center.linearRingss = function(flatCoordinates, offset, endss, stride) {
  var flatCenters = [];
  var i, ii;
  var extent = ol.extent.createEmpty();
  for (i = 0, ii = endss.length; i < ii; ++i) {
    var ends = endss[i];
    extent = ol.extent.createOrUpdateFromFlatCoordinates(
        flatCoordinates, offset, ends[0], stride);
    flatCenters.push((extent[0] + extent[2]) / 2, (extent[1] + extent[3]) / 2);
    offset = ends[ends.length - 1];
  }
  return flatCenters;
};

goog.provide('ol.geom.MultiPolygon');

goog.require('ol');
goog.require('ol.array');
goog.require('ol.extent');
goog.require('ol.geom.GeometryLayout');
goog.require('ol.geom.GeometryType');
goog.require('ol.geom.MultiPoint');
goog.require('ol.geom.Polygon');
goog.require('ol.geom.SimpleGeometry');
goog.require('ol.geom.flat.area');
goog.require('ol.geom.flat.center');
goog.require('ol.geom.flat.closest');
goog.require('ol.geom.flat.contains');
goog.require('ol.geom.flat.deflate');
goog.require('ol.geom.flat.inflate');
goog.require('ol.geom.flat.interiorpoint');
goog.require('ol.geom.flat.intersectsextent');
goog.require('ol.geom.flat.orient');
goog.require('ol.geom.flat.simplify');


/**
 * @classdesc
 * Multi-polygon geometry.
 *
 * @constructor
 * @extends {ol.geom.SimpleGeometry}
 * @param {Array.<Array.<Array.<ol.Coordinate>>>} coordinates Coordinates.
 * @param {ol.geom.GeometryLayout=} opt_layout Layout.
 * @api stable
 */
ol.geom.MultiPolygon = function(coordinates, opt_layout) {

  ol.geom.SimpleGeometry.call(this);

  /**
   * @type {Array.<Array.<number>>}
   * @private
   */
  this.endss_ = [];

  /**
   * @private
   * @type {number}
   */
  this.flatInteriorPointsRevision_ = -1;

  /**
   * @private
   * @type {Array.<number>}
   */
  this.flatInteriorPoints_ = null;

  /**
   * @private
   * @type {number}
   */
  this.maxDelta_ = -1;

  /**
   * @private
   * @type {number}
   */
  this.maxDeltaRevision_ = -1;

  /**
   * @private
   * @type {number}
   */
  this.orientedRevision_ = -1;

  /**
   * @private
   * @type {Array.<number>}
   */
  this.orientedFlatCoordinates_ = null;

  this.setCoordinates(coordinates, opt_layout);

};
ol.inherits(ol.geom.MultiPolygon, ol.geom.SimpleGeometry);


/**
 * Append the passed polygon to this multipolygon.
 * @param {ol.geom.Polygon} polygon Polygon.
 * @api stable
 */
ol.geom.MultiPolygon.prototype.appendPolygon = function(polygon) {
  goog.DEBUG && console.assert(polygon.getLayout() == this.layout,
      'layout of polygon should match layout');
  /** @type {Array.<number>} */
  var ends;
  if (!this.flatCoordinates) {
    this.flatCoordinates = polygon.getFlatCoordinates().slice();
    ends = polygon.getEnds().slice();
    this.endss_.push();
  } else {
    var offset = this.flatCoordinates.length;
    ol.array.extend(this.flatCoordinates, polygon.getFlatCoordinates());
    ends = polygon.getEnds().slice();
    var i, ii;
    for (i = 0, ii = ends.length; i < ii; ++i) {
      ends[i] += offset;
    }
  }
  this.endss_.push(ends);
  this.changed();
};


/**
 * Make a complete copy of the geometry.
 * @return {!ol.geom.MultiPolygon} Clone.
 * @api stable
 */
ol.geom.MultiPolygon.prototype.clone = function() {
  var multiPolygon = new ol.geom.MultiPolygon(null);

  var len = this.endss_.length;
  var newEndss = new Array(len);
  for (var i = 0; i < len; ++i) {
    newEndss[i] = this.endss_[i].slice();
  }

  multiPolygon.setFlatCoordinates(
      this.layout, this.flatCoordinates.slice(), newEndss);
  return multiPolygon;
};


/**
 * @inheritDoc
 */
ol.geom.MultiPolygon.prototype.closestPointXY = function(x, y, closestPoint, minSquaredDistance) {
  if (minSquaredDistance <
      ol.extent.closestSquaredDistanceXY(this.getExtent(), x, y)) {
    return minSquaredDistance;
  }
  if (this.maxDeltaRevision_ != this.getRevision()) {
    this.maxDelta_ = Math.sqrt(ol.geom.flat.closest.getssMaxSquaredDelta(
        this.flatCoordinates, 0, this.endss_, this.stride, 0));
    this.maxDeltaRevision_ = this.getRevision();
  }
  return ol.geom.flat.closest.getssClosestPoint(
      this.getOrientedFlatCoordinates(), 0, this.endss_, this.stride,
      this.maxDelta_, true, x, y, closestPoint, minSquaredDistance);
};


/**
 * @inheritDoc
 */
ol.geom.MultiPolygon.prototype.containsXY = function(x, y) {
  return ol.geom.flat.contains.linearRingssContainsXY(
      this.getOrientedFlatCoordinates(), 0, this.endss_, this.stride, x, y);
};


/**
 * Return the area of the multipolygon on projected plane.
 * @return {number} Area (on projected plane).
 * @api stable
 */
ol.geom.MultiPolygon.prototype.getArea = function() {
  return ol.geom.flat.area.linearRingss(
      this.getOrientedFlatCoordinates(), 0, this.endss_, this.stride);
};


/**
 * Get the coordinate array for this geometry.  This array has the structure
 * of a GeoJSON coordinate array for multi-polygons.
 *
 * @param {boolean=} opt_right Orient coordinates according to the right-hand
 *     rule (counter-clockwise for exterior and clockwise for interior rings).
 *     If `false`, coordinates will be oriented according to the left-hand rule
 *     (clockwise for exterior and counter-clockwise for interior rings).
 *     By default, coordinate orientation will depend on how the geometry was
 *     constructed.
 * @return {Array.<Array.<Array.<ol.Coordinate>>>} Coordinates.
 * @api stable
 */
ol.geom.MultiPolygon.prototype.getCoordinates = function(opt_right) {
  var flatCoordinates;
  if (opt_right !== undefined) {
    flatCoordinates = this.getOrientedFlatCoordinates().slice();
    ol.geom.flat.orient.orientLinearRingss(
        flatCoordinates, 0, this.endss_, this.stride, opt_right);
  } else {
    flatCoordinates = this.flatCoordinates;
  }

  return ol.geom.flat.inflate.coordinatesss(
      flatCoordinates, 0, this.endss_, this.stride);
};


/**
 * @return {Array.<Array.<number>>} Endss.
 */
ol.geom.MultiPolygon.prototype.getEndss = function() {
  return this.endss_;
};


/**
 * @return {Array.<number>} Flat interior points.
 */
ol.geom.MultiPolygon.prototype.getFlatInteriorPoints = function() {
  if (this.flatInteriorPointsRevision_ != this.getRevision()) {
    var flatCenters = ol.geom.flat.center.linearRingss(
        this.flatCoordinates, 0, this.endss_, this.stride);
    this.flatInteriorPoints_ = ol.geom.flat.interiorpoint.linearRingss(
        this.getOrientedFlatCoordinates(), 0, this.endss_, this.stride,
        flatCenters);
    this.flatInteriorPointsRevision_ = this.getRevision();
  }
  return this.flatInteriorPoints_;
};


/**
 * Return the interior points as {@link ol.geom.MultiPoint multipoint}.
 * @return {ol.geom.MultiPoint} Interior points.
 * @api stable
 */
ol.geom.MultiPolygon.prototype.getInteriorPoints = function() {
  var interiorPoints = new ol.geom.MultiPoint(null);
  interiorPoints.setFlatCoordinates(ol.geom.GeometryLayout.XY,
      this.getFlatInteriorPoints().slice());
  return interiorPoints;
};


/**
 * @return {Array.<number>} Oriented flat coordinates.
 */
ol.geom.MultiPolygon.prototype.getOrientedFlatCoordinates = function() {
  if (this.orientedRevision_ != this.getRevision()) {
    var flatCoordinates = this.flatCoordinates;
    if (ol.geom.flat.orient.linearRingssAreOriented(
        flatCoordinates, 0, this.endss_, this.stride)) {
      this.orientedFlatCoordinates_ = flatCoordinates;
    } else {
      this.orientedFlatCoordinates_ = flatCoordinates.slice();
      this.orientedFlatCoordinates_.length =
          ol.geom.flat.orient.orientLinearRingss(
              this.orientedFlatCoordinates_, 0, this.endss_, this.stride);
    }
    this.orientedRevision_ = this.getRevision();
  }
  return this.orientedFlatCoordinates_;
};


/**
 * @inheritDoc
 */
ol.geom.MultiPolygon.prototype.getSimplifiedGeometryInternal = function(squaredTolerance) {
  var simplifiedFlatCoordinates = [];
  var simplifiedEndss = [];
  simplifiedFlatCoordinates.length = ol.geom.flat.simplify.quantizess(
      this.flatCoordinates, 0, this.endss_, this.stride,
      Math.sqrt(squaredTolerance),
      simplifiedFlatCoordinates, 0, simplifiedEndss);
  var simplifiedMultiPolygon = new ol.geom.MultiPolygon(null);
  simplifiedMultiPolygon.setFlatCoordinates(
      ol.geom.GeometryLayout.XY, simplifiedFlatCoordinates, simplifiedEndss);
  return simplifiedMultiPolygon;
};


/**
 * Return the polygon at the specified index.
 * @param {number} index Index.
 * @return {ol.geom.Polygon} Polygon.
 * @api stable
 */
ol.geom.MultiPolygon.prototype.getPolygon = function(index) {
  goog.DEBUG && console.assert(0 <= index && index < this.endss_.length,
      'index should be in between 0 and the length of this.endss_');
  if (index < 0 || this.endss_.length <= index) {
    return null;
  }
  var offset;
  if (index === 0) {
    offset = 0;
  } else {
    var prevEnds = this.endss_[index - 1];
    offset = prevEnds[prevEnds.length - 1];
  }
  var ends = this.endss_[index].slice();
  var end = ends[ends.length - 1];
  if (offset !== 0) {
    var i, ii;
    for (i = 0, ii = ends.length; i < ii; ++i) {
      ends[i] -= offset;
    }
  }
  var polygon = new ol.geom.Polygon(null);
  polygon.setFlatCoordinates(
      this.layout, this.flatCoordinates.slice(offset, end), ends);
  return polygon;
};


/**
 * Return the polygons of this multipolygon.
 * @return {Array.<ol.geom.Polygon>} Polygons.
 * @api stable
 */
ol.geom.MultiPolygon.prototype.getPolygons = function() {
  var layout = this.layout;
  var flatCoordinates = this.flatCoordinates;
  var endss = this.endss_;
  var polygons = [];
  var offset = 0;
  var i, ii, j, jj;
  for (i = 0, ii = endss.length; i < ii; ++i) {
    var ends = endss[i].slice();
    var end = ends[ends.length - 1];
    if (offset !== 0) {
      for (j = 0, jj = ends.length; j < jj; ++j) {
        ends[j] -= offset;
      }
    }
    var polygon = new ol.geom.Polygon(null);
    polygon.setFlatCoordinates(
        layout, flatCoordinates.slice(offset, end), ends);
    polygons.push(polygon);
    offset = end;
  }
  return polygons;
};


/**
 * @inheritDoc
 * @api stable
 */
ol.geom.MultiPolygon.prototype.getType = function() {
  return ol.geom.GeometryType.MULTI_POLYGON;
};


/**
 * @inheritDoc
 * @api stable
 */
ol.geom.MultiPolygon.prototype.intersectsExtent = function(extent) {
  return ol.geom.flat.intersectsextent.linearRingss(
      this.getOrientedFlatCoordinates(), 0, this.endss_, this.stride, extent);
};


/**
 * Set the coordinates of the multipolygon.
 * @param {Array.<Array.<Array.<ol.Coordinate>>>} coordinates Coordinates.
 * @param {ol.geom.GeometryLayout=} opt_layout Layout.
 * @api stable
 */
ol.geom.MultiPolygon.prototype.setCoordinates = function(coordinates, opt_layout) {
  if (!coordinates) {
    this.setFlatCoordinates(ol.geom.GeometryLayout.XY, null, this.endss_);
  } else {
    this.setLayout(opt_layout, coordinates, 3);
    if (!this.flatCoordinates) {
      this.flatCoordinates = [];
    }
    var endss = ol.geom.flat.deflate.coordinatesss(
        this.flatCoordinates, 0, coordinates, this.stride, this.endss_);
    if (endss.length === 0) {
      this.flatCoordinates.length = 0;
    } else {
      var lastEnds = endss[endss.length - 1];
      this.flatCoordinates.length = lastEnds.length === 0 ?
          0 : lastEnds[lastEnds.length - 1];
    }
    this.changed();
  }
};


/**
 * @param {ol.geom.GeometryLayout} layout Layout.
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {Array.<Array.<number>>} endss Endss.
 */
ol.geom.MultiPolygon.prototype.setFlatCoordinates = function(layout, flatCoordinates, endss) {
  goog.DEBUG && console.assert(endss, 'endss must be truthy');
  if (!flatCoordinates || flatCoordinates.length === 0) {
    goog.DEBUG && console.assert(endss.length === 0, 'the length of endss should be 0');
  } else {
    goog.DEBUG && console.assert(endss.length > 0, 'endss cannot be an empty array');
    var ends = endss[endss.length - 1];
    goog.DEBUG && console.assert(flatCoordinates.length == ends[ends.length - 1],
        'the length of flatCoordinates should be the last value of ends');
  }
  this.setFlatCoordinatesInternal(layout, flatCoordinates);
  this.endss_ = endss;
  this.changed();
};


/**
 * @param {Array.<ol.geom.Polygon>} polygons Polygons.
 */
ol.geom.MultiPolygon.prototype.setPolygons = function(polygons) {
  var layout = this.getLayout();
  var flatCoordinates = [];
  var endss = [];
  var i, ii, ends;
  for (i = 0, ii = polygons.length; i < ii; ++i) {
    var polygon = polygons[i];
    if (i === 0) {
      layout = polygon.getLayout();
    } else {
      // FIXME better handle the case of non-matching layouts
      goog.DEBUG && console.assert(polygon.getLayout() == layout,
          'layout of polygon should be layout');
    }
    var offset = flatCoordinates.length;
    ends = polygon.getEnds();
    var j, jj;
    for (j = 0, jj = ends.length; j < jj; ++j) {
      ends[j] += offset;
    }
    ol.array.extend(flatCoordinates, polygon.getFlatCoordinates());
    endss.push(ends);
  }
  this.setFlatCoordinates(layout, flatCoordinates, endss);
};

goog.provide('ol.format.EsriJSON');

goog.require('ol');
goog.require('ol.Feature');
goog.require('ol.array');
goog.require('ol.asserts');
goog.require('ol.extent');
goog.require('ol.format.Feature');
goog.require('ol.format.JSONFeature');
goog.require('ol.geom.GeometryLayout');
goog.require('ol.geom.GeometryType');
goog.require('ol.geom.LineString');
goog.require('ol.geom.LinearRing');
goog.require('ol.geom.MultiLineString');
goog.require('ol.geom.MultiPoint');
goog.require('ol.geom.MultiPolygon');
goog.require('ol.geom.Point');
goog.require('ol.geom.Polygon');
goog.require('ol.geom.flat.orient');
goog.require('ol.obj');
goog.require('ol.proj');


/**
 * @classdesc
 * Feature format for reading and writing data in the EsriJSON format.
 *
 * @constructor
 * @extends {ol.format.JSONFeature}
 * @param {olx.format.EsriJSONOptions=} opt_options Options.
 * @api
 */
ol.format.EsriJSON = function(opt_options) {

  var options = opt_options ? opt_options : {};

  ol.format.JSONFeature.call(this);

  /**
   * Name of the geometry attribute for features.
   * @type {string|undefined}
   * @private
   */
  this.geometryName_ = options.geometryName;

};
ol.inherits(ol.format.EsriJSON, ol.format.JSONFeature);


/**
 * @param {EsriJSONGeometry} object Object.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @private
 * @return {ol.geom.Geometry} Geometry.
 */
ol.format.EsriJSON.readGeometry_ = function(object, opt_options) {
  if (!object) {
    return null;
  }
  /** @type {ol.geom.GeometryType} */
  var type;
  if (typeof object.x === 'number' && typeof object.y === 'number') {
    type = ol.geom.GeometryType.POINT;
  } else if (object.points) {
    type = ol.geom.GeometryType.MULTI_POINT;
  } else if (object.paths) {
    if (object.paths.length === 1) {
      type = ol.geom.GeometryType.LINE_STRING;
    } else {
      type = ol.geom.GeometryType.MULTI_LINE_STRING;
    }
  } else if (object.rings) {
    var layout = ol.format.EsriJSON.getGeometryLayout_(object);
    var rings = ol.format.EsriJSON.convertRings_(object.rings, layout);
    object = /** @type {EsriJSONGeometry} */(ol.obj.assign({}, object));
    if (rings.length === 1) {
      type = ol.geom.GeometryType.POLYGON;
      object.rings = rings[0];
    } else {
      type = ol.geom.GeometryType.MULTI_POLYGON;
      object.rings = rings;
    }
  }
  var geometryReader = ol.format.EsriJSON.GEOMETRY_READERS_[type];
  return /** @type {ol.geom.Geometry} */ (
      ol.format.Feature.transformWithOptions(
          geometryReader(object), false, opt_options));
};


/**
 * Determines inner and outer rings.
 * Checks if any polygons in this array contain any other polygons in this
 * array. It is used for checking for holes.
 * Logic inspired by: https://github.com/Esri/terraformer-arcgis-parser
 * @param {Array.<!Array.<!Array.<number>>>} rings Rings.
 * @param {ol.geom.GeometryLayout} layout Geometry layout.
 * @private
 * @return {Array.<!Array.<!Array.<number>>>} Transoformed rings.
 */
ol.format.EsriJSON.convertRings_ = function(rings, layout) {
  var outerRings = [];
  var holes = [];
  var i, ii;
  for (i = 0, ii = rings.length; i < ii; ++i) {
    var flatRing = ol.array.flatten(rings[i]);
    // is this ring an outer ring? is it clockwise?
    var clockwise = ol.geom.flat.orient.linearRingIsClockwise(flatRing, 0,
        flatRing.length, layout.length);
    if (clockwise) {
      outerRings.push([rings[i]]);
    } else {
      holes.push(rings[i]);
    }
  }
  while (holes.length) {
    var hole = holes.shift();
    var matched = false;
    // loop over all outer rings and see if they contain our hole.
    for (i = outerRings.length - 1; i >= 0; i--) {
      var outerRing = outerRings[i][0];
      if (ol.extent.containsExtent(new ol.geom.LinearRing(
          outerRing).getExtent(),
          new ol.geom.LinearRing(hole).getExtent())) {
        // the hole is contained push it into our polygon
        outerRings[i].push(hole);
        matched = true;
        break;
      }
    }
    if (!matched) {
      // no outer rings contain this hole turn it into and outer
      // ring (reverse it)
      outerRings.push([hole.reverse()]);
    }
  }
  return outerRings;
};


/**
 * @param {EsriJSONGeometry} object Object.
 * @private
 * @return {ol.geom.Geometry} Point.
 */
ol.format.EsriJSON.readPointGeometry_ = function(object) {
  goog.DEBUG && console.assert(typeof object.x === 'number', 'object.x should be number');
  goog.DEBUG && console.assert(typeof object.y === 'number', 'object.y should be number');
  var point;
  if (object.m !== undefined && object.z !== undefined) {
    point = new ol.geom.Point([object.x, object.y, object.z, object.m],
        ol.geom.GeometryLayout.XYZM);
  } else if (object.z !== undefined) {
    point = new ol.geom.Point([object.x, object.y, object.z],
        ol.geom.GeometryLayout.XYZ);
  } else if (object.m !== undefined) {
    point = new ol.geom.Point([object.x, object.y, object.m],
        ol.geom.GeometryLayout.XYM);
  } else {
    point = new ol.geom.Point([object.x, object.y]);
  }
  return point;
};


/**
 * @param {EsriJSONGeometry} object Object.
 * @private
 * @return {ol.geom.Geometry} LineString.
 */
ol.format.EsriJSON.readLineStringGeometry_ = function(object) {
  goog.DEBUG && console.assert(Array.isArray(object.paths),
      'object.paths should be an array');
  goog.DEBUG && console.assert(object.paths.length === 1,
      'object.paths array length should be 1');
  var layout = ol.format.EsriJSON.getGeometryLayout_(object);
  return new ol.geom.LineString(object.paths[0], layout);
};


/**
 * @param {EsriJSONGeometry} object Object.
 * @private
 * @return {ol.geom.Geometry} MultiLineString.
 */
ol.format.EsriJSON.readMultiLineStringGeometry_ = function(object) {
  goog.DEBUG && console.assert(Array.isArray(object.paths),
      'object.paths should be an array');
  goog.DEBUG && console.assert(object.paths.length > 1,
      'object.paths array length should be more than 1');
  var layout = ol.format.EsriJSON.getGeometryLayout_(object);
  return new ol.geom.MultiLineString(object.paths, layout);
};


/**
 * @param {EsriJSONGeometry} object Object.
 * @private
 * @return {ol.geom.GeometryLayout} The geometry layout to use.
 */
ol.format.EsriJSON.getGeometryLayout_ = function(object) {
  var layout = ol.geom.GeometryLayout.XY;
  if (object.hasZ === true && object.hasM === true) {
    layout = ol.geom.GeometryLayout.XYZM;
  } else if (object.hasZ === true) {
    layout = ol.geom.GeometryLayout.XYZ;
  } else if (object.hasM === true) {
    layout = ol.geom.GeometryLayout.XYM;
  }
  return layout;
};


/**
 * @param {EsriJSONGeometry} object Object.
 * @private
 * @return {ol.geom.Geometry} MultiPoint.
 */
ol.format.EsriJSON.readMultiPointGeometry_ = function(object) {
  var layout = ol.format.EsriJSON.getGeometryLayout_(object);
  return new ol.geom.MultiPoint(object.points, layout);
};


/**
 * @param {EsriJSONGeometry} object Object.
 * @private
 * @return {ol.geom.Geometry} MultiPolygon.
 */
ol.format.EsriJSON.readMultiPolygonGeometry_ = function(object) {
  goog.DEBUG && console.assert(object.rings.length > 1,
      'object.rings should have length larger than 1');
  var layout = ol.format.EsriJSON.getGeometryLayout_(object);
  return new ol.geom.MultiPolygon(
      /** @type {Array.<Array.<Array.<Array.<number>>>>} */(object.rings),
      layout);
};


/**
 * @param {EsriJSONGeometry} object Object.
 * @private
 * @return {ol.geom.Geometry} Polygon.
 */
ol.format.EsriJSON.readPolygonGeometry_ = function(object) {
  goog.DEBUG && console.assert(object.rings);
  var layout = ol.format.EsriJSON.getGeometryLayout_(object);
  return new ol.geom.Polygon(object.rings, layout);
};


/**
 * @param {ol.geom.Geometry} geometry Geometry.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @private
 * @return {EsriJSONGeometry} EsriJSON geometry.
 */
ol.format.EsriJSON.writePointGeometry_ = function(geometry, opt_options) {
  var coordinates = /** @type {ol.geom.Point} */ (geometry).getCoordinates();
  var esriJSON;
  var layout = /** @type {ol.geom.Point} */ (geometry).getLayout();
  if (layout === ol.geom.GeometryLayout.XYZ) {
    esriJSON = /** @type {EsriJSONPoint} */ ({
      x: coordinates[0],
      y: coordinates[1],
      z: coordinates[2]
    });
  } else if (layout === ol.geom.GeometryLayout.XYM) {
    esriJSON = /** @type {EsriJSONPoint} */ ({
      x: coordinates[0],
      y: coordinates[1],
      m: coordinates[2]
    });
  } else if (layout === ol.geom.GeometryLayout.XYZM) {
    esriJSON = /** @type {EsriJSONPoint} */ ({
      x: coordinates[0],
      y: coordinates[1],
      z: coordinates[2],
      m: coordinates[3]
    });
  } else if (layout === ol.geom.GeometryLayout.XY) {
    esriJSON = /** @type {EsriJSONPoint} */ ({
      x: coordinates[0],
      y: coordinates[1]
    });
  } else {
    ol.asserts.assert(false, 34); // Invalid geometry layout
  }
  return /** @type {EsriJSONGeometry} */ (esriJSON);
};


/**
 * @param {ol.geom.SimpleGeometry} geometry Geometry.
 * @private
 * @return {Object} Object with boolean hasZ and hasM keys.
 */
ol.format.EsriJSON.getHasZM_ = function(geometry) {
  var layout = geometry.getLayout();
  return {
    hasZ: (layout === ol.geom.GeometryLayout.XYZ ||
        layout === ol.geom.GeometryLayout.XYZM),
    hasM: (layout === ol.geom.GeometryLayout.XYM ||
        layout === ol.geom.GeometryLayout.XYZM)
  };
};


/**
 * @param {ol.geom.Geometry} geometry Geometry.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @private
 * @return {EsriJSONPolyline} EsriJSON geometry.
 */
ol.format.EsriJSON.writeLineStringGeometry_ = function(geometry, opt_options) {
  var hasZM = ol.format.EsriJSON.getHasZM_(/** @type {ol.geom.LineString} */ (geometry));
  return /** @type {EsriJSONPolyline} */ ({
    hasZ: hasZM.hasZ,
    hasM: hasZM.hasM,
    paths: [
      /** @type {ol.geom.LineString} */ (geometry).getCoordinates()
    ]
  });
};


/**
 * @param {ol.geom.Geometry} geometry Geometry.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @private
 * @return {EsriJSONPolygon} EsriJSON geometry.
 */
ol.format.EsriJSON.writePolygonGeometry_ = function(geometry, opt_options) {
  // Esri geometries use the left-hand rule
  var hasZM = ol.format.EsriJSON.getHasZM_(/** @type {ol.geom.Polygon} */ (geometry));
  return /** @type {EsriJSONPolygon} */ ({
    hasZ: hasZM.hasZ,
    hasM: hasZM.hasM,
    rings: /** @type {ol.geom.Polygon} */ (geometry).getCoordinates(false)
  });
};


/**
 * @param {ol.geom.Geometry} geometry Geometry.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @private
 * @return {EsriJSONPolyline} EsriJSON geometry.
 */
ol.format.EsriJSON.writeMultiLineStringGeometry_ = function(geometry, opt_options) {
  var hasZM = ol.format.EsriJSON.getHasZM_(/** @type {ol.geom.MultiLineString} */ (geometry));
  return /** @type {EsriJSONPolyline} */ ({
    hasZ: hasZM.hasZ,
    hasM: hasZM.hasM,
    paths: /** @type {ol.geom.MultiLineString} */ (geometry).getCoordinates()
  });
};


/**
 * @param {ol.geom.Geometry} geometry Geometry.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @private
 * @return {EsriJSONMultipoint} EsriJSON geometry.
 */
ol.format.EsriJSON.writeMultiPointGeometry_ = function(geometry, opt_options) {
  var hasZM = ol.format.EsriJSON.getHasZM_(/** @type {ol.geom.MultiPoint} */ (geometry));
  return /** @type {EsriJSONMultipoint} */ ({
    hasZ: hasZM.hasZ,
    hasM: hasZM.hasM,
    points: /** @type {ol.geom.MultiPoint} */ (geometry).getCoordinates()
  });
};


/**
 * @param {ol.geom.Geometry} geometry Geometry.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @private
 * @return {EsriJSONPolygon} EsriJSON geometry.
 */
ol.format.EsriJSON.writeMultiPolygonGeometry_ = function(geometry,
    opt_options) {
  var hasZM = ol.format.EsriJSON.getHasZM_(/** @type {ol.geom.MultiPolygon} */ (geometry));
  var coordinates = /** @type {ol.geom.MultiPolygon} */ (geometry).getCoordinates(false);
  var output = [];
  for (var i = 0; i < coordinates.length; i++) {
    for (var x = coordinates[i].length - 1; x >= 0; x--) {
      output.push(coordinates[i][x]);
    }
  }
  return /** @type {EsriJSONPolygon} */ ({
    hasZ: hasZM.hasZ,
    hasM: hasZM.hasM,
    rings: output
  });
};


/**
 * @const
 * @private
 * @type {Object.<ol.geom.GeometryType, function(EsriJSONGeometry): ol.geom.Geometry>}
 */
ol.format.EsriJSON.GEOMETRY_READERS_ = {};
ol.format.EsriJSON.GEOMETRY_READERS_[ol.geom.GeometryType.POINT] =
    ol.format.EsriJSON.readPointGeometry_;
ol.format.EsriJSON.GEOMETRY_READERS_[ol.geom.GeometryType.LINE_STRING] =
    ol.format.EsriJSON.readLineStringGeometry_;
ol.format.EsriJSON.GEOMETRY_READERS_[ol.geom.GeometryType.POLYGON] =
    ol.format.EsriJSON.readPolygonGeometry_;
ol.format.EsriJSON.GEOMETRY_READERS_[ol.geom.GeometryType.MULTI_POINT] =
    ol.format.EsriJSON.readMultiPointGeometry_;
ol.format.EsriJSON.GEOMETRY_READERS_[ol.geom.GeometryType.MULTI_LINE_STRING] =
    ol.format.EsriJSON.readMultiLineStringGeometry_;
ol.format.EsriJSON.GEOMETRY_READERS_[ol.geom.GeometryType.MULTI_POLYGON] =
    ol.format.EsriJSON.readMultiPolygonGeometry_;


/**
 * @const
 * @private
 * @type {Object.<string, function(ol.geom.Geometry, olx.format.WriteOptions=): (EsriJSONGeometry)>}
 */
ol.format.EsriJSON.GEOMETRY_WRITERS_ = {};
ol.format.EsriJSON.GEOMETRY_WRITERS_[ol.geom.GeometryType.POINT] =
    ol.format.EsriJSON.writePointGeometry_;
ol.format.EsriJSON.GEOMETRY_WRITERS_[ol.geom.GeometryType.LINE_STRING] =
    ol.format.EsriJSON.writeLineStringGeometry_;
ol.format.EsriJSON.GEOMETRY_WRITERS_[ol.geom.GeometryType.POLYGON] =
    ol.format.EsriJSON.writePolygonGeometry_;
ol.format.EsriJSON.GEOMETRY_WRITERS_[ol.geom.GeometryType.MULTI_POINT] =
    ol.format.EsriJSON.writeMultiPointGeometry_;
ol.format.EsriJSON.GEOMETRY_WRITERS_[ol.geom.GeometryType.MULTI_LINE_STRING] =
    ol.format.EsriJSON.writeMultiLineStringGeometry_;
ol.format.EsriJSON.GEOMETRY_WRITERS_[ol.geom.GeometryType.MULTI_POLYGON] =
    ol.format.EsriJSON.writeMultiPolygonGeometry_;


/**
 * Read a feature from a EsriJSON Feature source.  Only works for Feature,
 * use `readFeatures` to read FeatureCollection source.
 *
 * @function
 * @param {ArrayBuffer|Document|Node|Object|string} source Source.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @return {ol.Feature} Feature.
 * @api
 */
ol.format.EsriJSON.prototype.readFeature;


/**
 * Read all features from a EsriJSON source.  Works with both Feature and
 * FeatureCollection sources.
 *
 * @function
 * @param {ArrayBuffer|Document|Node|Object|string} source Source.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @return {Array.<ol.Feature>} Features.
 * @api
 */
ol.format.EsriJSON.prototype.readFeatures;


/**
 * @inheritDoc
 */
ol.format.EsriJSON.prototype.readFeatureFromObject = function(
    object, opt_options) {
  var esriJSONFeature = /** @type {EsriJSONFeature} */ (object);
  goog.DEBUG && console.assert(esriJSONFeature.geometry ||
      esriJSONFeature.attributes,
      'geometry or attributes should be defined');
  var geometry = ol.format.EsriJSON.readGeometry_(esriJSONFeature.geometry,
      opt_options);
  var feature = new ol.Feature();
  if (this.geometryName_) {
    feature.setGeometryName(this.geometryName_);
  }
  feature.setGeometry(geometry);
  if (opt_options && opt_options.idField &&
      esriJSONFeature.attributes[opt_options.idField]) {
    goog.DEBUG && console.assert(
        typeof esriJSONFeature.attributes[opt_options.idField] === 'number',
        'objectIdFieldName value should be a number');
    feature.setId(/** @type {number} */(
        esriJSONFeature.attributes[opt_options.idField]));
  }
  if (esriJSONFeature.attributes) {
    feature.setProperties(esriJSONFeature.attributes);
  }
  return feature;
};


/**
 * @inheritDoc
 */
ol.format.EsriJSON.prototype.readFeaturesFromObject = function(
    object, opt_options) {
  var esriJSONObject = /** @type {EsriJSONObject} */ (object);
  var options = opt_options ? opt_options : {};
  if (esriJSONObject.features) {
    var esriJSONFeatureCollection = /** @type {EsriJSONFeatureCollection} */
        (object);
    /** @type {Array.<ol.Feature>} */
    var features = [];
    var esriJSONFeatures = esriJSONFeatureCollection.features;
    var i, ii;
    options.idField = object.objectIdFieldName;
    for (i = 0, ii = esriJSONFeatures.length; i < ii; ++i) {
      features.push(this.readFeatureFromObject(esriJSONFeatures[i],
          options));
    }
    return features;
  } else {
    return [this.readFeatureFromObject(object, options)];
  }
};


/**
 * Read a geometry from a EsriJSON source.
 *
 * @function
 * @param {ArrayBuffer|Document|Node|Object|string} source Source.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @return {ol.geom.Geometry} Geometry.
 * @api
 */
ol.format.EsriJSON.prototype.readGeometry;


/**
 * @inheritDoc
 */
ol.format.EsriJSON.prototype.readGeometryFromObject = function(
    object, opt_options) {
  return ol.format.EsriJSON.readGeometry_(
      /** @type {EsriJSONGeometry} */ (object), opt_options);
};


/**
 * Read the projection from a EsriJSON source.
 *
 * @function
 * @param {ArrayBuffer|Document|Node|Object|string} source Source.
 * @return {ol.proj.Projection} Projection.
 * @api
 */
ol.format.EsriJSON.prototype.readProjection;


/**
 * @inheritDoc
 */
ol.format.EsriJSON.prototype.readProjectionFromObject = function(object) {
  var esriJSONObject = /** @type {EsriJSONObject} */ (object);
  if (esriJSONObject.spatialReference && esriJSONObject.spatialReference.wkid) {
    var crs = esriJSONObject.spatialReference.wkid;
    return ol.proj.get('EPSG:' + crs);
  } else {
    return null;
  }
};


/**
 * @param {ol.geom.Geometry} geometry Geometry.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @private
 * @return {EsriJSONGeometry} EsriJSON geometry.
 */
ol.format.EsriJSON.writeGeometry_ = function(geometry, opt_options) {
  var geometryWriter = ol.format.EsriJSON.GEOMETRY_WRITERS_[geometry.getType()];
  return geometryWriter(/** @type {ol.geom.Geometry} */ (
      ol.format.Feature.transformWithOptions(geometry, true, opt_options)),
      opt_options);
};


/**
 * Encode a geometry as a EsriJSON string.
 *
 * @function
 * @param {ol.geom.Geometry} geometry Geometry.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @return {string} EsriJSON.
 * @api
 */
ol.format.EsriJSON.prototype.writeGeometry;


/**
 * Encode a geometry as a EsriJSON object.
 *
 * @param {ol.geom.Geometry} geometry Geometry.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @return {EsriJSONGeometry} Object.
 * @api
 */
ol.format.EsriJSON.prototype.writeGeometryObject = function(geometry,
    opt_options) {
  return ol.format.EsriJSON.writeGeometry_(geometry,
      this.adaptOptions(opt_options));
};


/**
 * Encode a feature as a EsriJSON Feature string.
 *
 * @function
 * @param {ol.Feature} feature Feature.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @return {string} EsriJSON.
 * @api
 */
ol.format.EsriJSON.prototype.writeFeature;


/**
 * Encode a feature as a esriJSON Feature object.
 *
 * @param {ol.Feature} feature Feature.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @return {Object} Object.
 * @api
 */
ol.format.EsriJSON.prototype.writeFeatureObject = function(
    feature, opt_options) {
  opt_options = this.adaptOptions(opt_options);
  var object = {};
  var geometry = feature.getGeometry();
  if (geometry) {
    object['geometry'] =
        ol.format.EsriJSON.writeGeometry_(geometry, opt_options);
  }
  var properties = feature.getProperties();
  delete properties[feature.getGeometryName()];
  if (!ol.obj.isEmpty(properties)) {
    object['attributes'] = properties;
  } else {
    object['attributes'] = {};
  }
  if (opt_options && opt_options.featureProjection) {
    object['spatialReference'] = /** @type {EsriJSONCRS} */({
      wkid: ol.proj.get(
          opt_options.featureProjection).getCode().split(':').pop()
    });
  }
  return object;
};


/**
 * Encode an array of features as EsriJSON.
 *
 * @function
 * @param {Array.<ol.Feature>} features Features.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @return {string} EsriJSON.
 * @api
 */
ol.format.EsriJSON.prototype.writeFeatures;


/**
 * Encode an array of features as a EsriJSON object.
 *
 * @param {Array.<ol.Feature>} features Features.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @return {Object} EsriJSON Object.
 * @api
 */
ol.format.EsriJSON.prototype.writeFeaturesObject = function(features, opt_options) {
  opt_options = this.adaptOptions(opt_options);
  var objects = [];
  var i, ii;
  for (i = 0, ii = features.length; i < ii; ++i) {
    objects.push(this.writeFeatureObject(features[i], opt_options));
  }
  return /** @type {EsriJSONFeatureCollection} */ ({
    'features': objects
  });
};

goog.provide('ol.geom.GeometryCollection');

goog.require('ol');
goog.require('ol.events');
goog.require('ol.events.EventType');
goog.require('ol.extent');
goog.require('ol.geom.Geometry');
goog.require('ol.geom.GeometryType');
goog.require('ol.obj');


/**
 * @classdesc
 * An array of {@link ol.geom.Geometry} objects.
 *
 * @constructor
 * @extends {ol.geom.Geometry}
 * @param {Array.<ol.geom.Geometry>=} opt_geometries Geometries.
 * @api stable
 */
ol.geom.GeometryCollection = function(opt_geometries) {

  ol.geom.Geometry.call(this);

  /**
   * @private
   * @type {Array.<ol.geom.Geometry>}
   */
  this.geometries_ = opt_geometries ? opt_geometries : null;

  this.listenGeometriesChange_();
};
ol.inherits(ol.geom.GeometryCollection, ol.geom.Geometry);


/**
 * @param {Array.<ol.geom.Geometry>} geometries Geometries.
 * @private
 * @return {Array.<ol.geom.Geometry>} Cloned geometries.
 */
ol.geom.GeometryCollection.cloneGeometries_ = function(geometries) {
  var clonedGeometries = [];
  var i, ii;
  for (i = 0, ii = geometries.length; i < ii; ++i) {
    clonedGeometries.push(geometries[i].clone());
  }
  return clonedGeometries;
};


/**
 * @private
 */
ol.geom.GeometryCollection.prototype.unlistenGeometriesChange_ = function() {
  var i, ii;
  if (!this.geometries_) {
    return;
  }
  for (i = 0, ii = this.geometries_.length; i < ii; ++i) {
    ol.events.unlisten(
        this.geometries_[i], ol.events.EventType.CHANGE,
        this.changed, this);
  }
};


/**
 * @private
 */
ol.geom.GeometryCollection.prototype.listenGeometriesChange_ = function() {
  var i, ii;
  if (!this.geometries_) {
    return;
  }
  for (i = 0, ii = this.geometries_.length; i < ii; ++i) {
    ol.events.listen(
        this.geometries_[i], ol.events.EventType.CHANGE,
        this.changed, this);
  }
};


/**
 * Make a complete copy of the geometry.
 * @return {!ol.geom.GeometryCollection} Clone.
 * @api stable
 */
ol.geom.GeometryCollection.prototype.clone = function() {
  var geometryCollection = new ol.geom.GeometryCollection(null);
  geometryCollection.setGeometries(this.geometries_);
  return geometryCollection;
};


/**
 * @inheritDoc
 */
ol.geom.GeometryCollection.prototype.closestPointXY = function(x, y, closestPoint, minSquaredDistance) {
  if (minSquaredDistance <
      ol.extent.closestSquaredDistanceXY(this.getExtent(), x, y)) {
    return minSquaredDistance;
  }
  var geometries = this.geometries_;
  var i, ii;
  for (i = 0, ii = geometries.length; i < ii; ++i) {
    minSquaredDistance = geometries[i].closestPointXY(
        x, y, closestPoint, minSquaredDistance);
  }
  return minSquaredDistance;
};


/**
 * @inheritDoc
 */
ol.geom.GeometryCollection.prototype.containsXY = function(x, y) {
  var geometries = this.geometries_;
  var i, ii;
  for (i = 0, ii = geometries.length; i < ii; ++i) {
    if (geometries[i].containsXY(x, y)) {
      return true;
    }
  }
  return false;
};


/**
 * @inheritDoc
 */
ol.geom.GeometryCollection.prototype.computeExtent = function(extent) {
  ol.extent.createOrUpdateEmpty(extent);
  var geometries = this.geometries_;
  for (var i = 0, ii = geometries.length; i < ii; ++i) {
    ol.extent.extend(extent, geometries[i].getExtent());
  }
  return extent;
};


/**
 * Return the geometries that make up this geometry collection.
 * @return {Array.<ol.geom.Geometry>} Geometries.
 * @api stable
 */
ol.geom.GeometryCollection.prototype.getGeometries = function() {
  return ol.geom.GeometryCollection.cloneGeometries_(this.geometries_);
};


/**
 * @return {Array.<ol.geom.Geometry>} Geometries.
 */
ol.geom.GeometryCollection.prototype.getGeometriesArray = function() {
  return this.geometries_;
};


/**
 * @inheritDoc
 */
ol.geom.GeometryCollection.prototype.getSimplifiedGeometry = function(squaredTolerance) {
  if (this.simplifiedGeometryRevision != this.getRevision()) {
    ol.obj.clear(this.simplifiedGeometryCache);
    this.simplifiedGeometryMaxMinSquaredTolerance = 0;
    this.simplifiedGeometryRevision = this.getRevision();
  }
  if (squaredTolerance < 0 ||
      (this.simplifiedGeometryMaxMinSquaredTolerance !== 0 &&
       squaredTolerance < this.simplifiedGeometryMaxMinSquaredTolerance)) {
    return this;
  }
  var key = squaredTolerance.toString();
  if (this.simplifiedGeometryCache.hasOwnProperty(key)) {
    return this.simplifiedGeometryCache[key];
  } else {
    var simplifiedGeometries = [];
    var geometries = this.geometries_;
    var simplified = false;
    var i, ii;
    for (i = 0, ii = geometries.length; i < ii; ++i) {
      var geometry = geometries[i];
      var simplifiedGeometry = geometry.getSimplifiedGeometry(squaredTolerance);
      simplifiedGeometries.push(simplifiedGeometry);
      if (simplifiedGeometry !== geometry) {
        simplified = true;
      }
    }
    if (simplified) {
      var simplifiedGeometryCollection = new ol.geom.GeometryCollection(null);
      simplifiedGeometryCollection.setGeometriesArray(simplifiedGeometries);
      this.simplifiedGeometryCache[key] = simplifiedGeometryCollection;
      return simplifiedGeometryCollection;
    } else {
      this.simplifiedGeometryMaxMinSquaredTolerance = squaredTolerance;
      return this;
    }
  }
};


/**
 * @inheritDoc
 * @api stable
 */
ol.geom.GeometryCollection.prototype.getType = function() {
  return ol.geom.GeometryType.GEOMETRY_COLLECTION;
};


/**
 * @inheritDoc
 * @api stable
 */
ol.geom.GeometryCollection.prototype.intersectsExtent = function(extent) {
  var geometries = this.geometries_;
  var i, ii;
  for (i = 0, ii = geometries.length; i < ii; ++i) {
    if (geometries[i].intersectsExtent(extent)) {
      return true;
    }
  }
  return false;
};


/**
 * @return {boolean} Is empty.
 */
ol.geom.GeometryCollection.prototype.isEmpty = function() {
  return this.geometries_.length === 0;
};


/**
 * @inheritDoc
 * @api
 */
ol.geom.GeometryCollection.prototype.rotate = function(angle, anchor) {
  var geometries = this.geometries_;
  for (var i = 0, ii = geometries.length; i < ii; ++i) {
    geometries[i].rotate(angle, anchor);
  }
  this.changed();
};


/**
 * @inheritDoc
 * @api
 */
ol.geom.GeometryCollection.prototype.scale = function(sx, opt_sy, opt_anchor) {
  var anchor = opt_anchor;
  if (!anchor) {
    anchor = ol.extent.getCenter(this.getExtent());
  }
  var geometries = this.geometries_;
  for (var i = 0, ii = geometries.length; i < ii; ++i) {
    geometries[i].scale(sx, opt_sy, anchor);
  }
  this.changed();
};


/**
 * Set the geometries that make up this geometry collection.
 * @param {Array.<ol.geom.Geometry>} geometries Geometries.
 * @api stable
 */
ol.geom.GeometryCollection.prototype.setGeometries = function(geometries) {
  this.setGeometriesArray(
      ol.geom.GeometryCollection.cloneGeometries_(geometries));
};


/**
 * @param {Array.<ol.geom.Geometry>} geometries Geometries.
 */
ol.geom.GeometryCollection.prototype.setGeometriesArray = function(geometries) {
  this.unlistenGeometriesChange_();
  this.geometries_ = geometries;
  this.listenGeometriesChange_();
  this.changed();
};


/**
 * @inheritDoc
 * @api stable
 */
ol.geom.GeometryCollection.prototype.applyTransform = function(transformFn) {
  var geometries = this.geometries_;
  var i, ii;
  for (i = 0, ii = geometries.length; i < ii; ++i) {
    geometries[i].applyTransform(transformFn);
  }
  this.changed();
};


/**
 * Translate the geometry.
 * @param {number} deltaX Delta X.
 * @param {number} deltaY Delta Y.
 * @api
 */
ol.geom.GeometryCollection.prototype.translate = function(deltaX, deltaY) {
  var geometries = this.geometries_;
  var i, ii;
  for (i = 0, ii = geometries.length; i < ii; ++i) {
    geometries[i].translate(deltaX, deltaY);
  }
  this.changed();
};


/**
 * @inheritDoc
 */
ol.geom.GeometryCollection.prototype.disposeInternal = function() {
  this.unlistenGeometriesChange_();
  ol.geom.Geometry.prototype.disposeInternal.call(this);
};

// TODO: serialize dataProjection as crs member when writing
// see https://github.com/openlayers/ol3/issues/2078

goog.provide('ol.format.GeoJSON');

goog.require('ol');
goog.require('ol.asserts');
goog.require('ol.Feature');
goog.require('ol.format.Feature');
goog.require('ol.format.JSONFeature');
goog.require('ol.geom.GeometryCollection');
goog.require('ol.geom.LineString');
goog.require('ol.geom.MultiLineString');
goog.require('ol.geom.MultiPoint');
goog.require('ol.geom.MultiPolygon');
goog.require('ol.geom.Point');
goog.require('ol.geom.Polygon');
goog.require('ol.obj');
goog.require('ol.proj');


/**
 * @classdesc
 * Feature format for reading and writing data in the GeoJSON format.
 *
 * @constructor
 * @extends {ol.format.JSONFeature}
 * @param {olx.format.GeoJSONOptions=} opt_options Options.
 * @api stable
 */
ol.format.GeoJSON = function(opt_options) {

  var options = opt_options ? opt_options : {};

  ol.format.JSONFeature.call(this);

  /**
   * @inheritDoc
   */
  this.defaultDataProjection = ol.proj.get(
      options.defaultDataProjection ?
          options.defaultDataProjection : 'EPSG:4326');


  /**
   * Name of the geometry attribute for features.
   * @type {string|undefined}
   * @private
   */
  this.geometryName_ = options.geometryName;

};
ol.inherits(ol.format.GeoJSON, ol.format.JSONFeature);


/**
 * @const
 * @type {Array.<string>}
 * @private
 */
ol.format.GeoJSON.EXTENSIONS_ = ['.geojson'];


/**
 * @param {GeoJSONGeometry|GeoJSONGeometryCollection} object Object.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @private
 * @return {ol.geom.Geometry} Geometry.
 */
ol.format.GeoJSON.readGeometry_ = function(object, opt_options) {
  if (!object) {
    return null;
  }
  var geometryReader = ol.format.GeoJSON.GEOMETRY_READERS_[object.type];
  return /** @type {ol.geom.Geometry} */ (
      ol.format.Feature.transformWithOptions(
          geometryReader(object), false, opt_options));
};


/**
 * @param {GeoJSONGeometryCollection} object Object.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @private
 * @return {ol.geom.GeometryCollection} Geometry collection.
 */
ol.format.GeoJSON.readGeometryCollectionGeometry_ = function(
    object, opt_options) {
  goog.DEBUG && console.assert(object.type == 'GeometryCollection',
      'object.type should be GeometryCollection');
  var geometries = object.geometries.map(
      /**
       * @param {GeoJSONGeometry} geometry Geometry.
       * @return {ol.geom.Geometry} geometry Geometry.
       */
      function(geometry) {
        return ol.format.GeoJSON.readGeometry_(geometry, opt_options);
      });
  return new ol.geom.GeometryCollection(geometries);
};


/**
 * @param {GeoJSONGeometry} object Object.
 * @private
 * @return {ol.geom.Point} Point.
 */
ol.format.GeoJSON.readPointGeometry_ = function(object) {
  goog.DEBUG && console.assert(object.type == 'Point',
      'object.type should be Point');
  return new ol.geom.Point(object.coordinates);
};


/**
 * @param {GeoJSONGeometry} object Object.
 * @private
 * @return {ol.geom.LineString} LineString.
 */
ol.format.GeoJSON.readLineStringGeometry_ = function(object) {
  goog.DEBUG && console.assert(object.type == 'LineString',
      'object.type should be LineString');
  return new ol.geom.LineString(object.coordinates);
};


/**
 * @param {GeoJSONGeometry} object Object.
 * @private
 * @return {ol.geom.MultiLineString} MultiLineString.
 */
ol.format.GeoJSON.readMultiLineStringGeometry_ = function(object) {
  goog.DEBUG && console.assert(object.type == 'MultiLineString',
      'object.type should be MultiLineString');
  return new ol.geom.MultiLineString(object.coordinates);
};


/**
 * @param {GeoJSONGeometry} object Object.
 * @private
 * @return {ol.geom.MultiPoint} MultiPoint.
 */
ol.format.GeoJSON.readMultiPointGeometry_ = function(object) {
  goog.DEBUG && console.assert(object.type == 'MultiPoint',
      'object.type should be MultiPoint');
  return new ol.geom.MultiPoint(object.coordinates);
};


/**
 * @param {GeoJSONGeometry} object Object.
 * @private
 * @return {ol.geom.MultiPolygon} MultiPolygon.
 */
ol.format.GeoJSON.readMultiPolygonGeometry_ = function(object) {
  goog.DEBUG && console.assert(object.type == 'MultiPolygon',
      'object.type should be MultiPolygon');
  return new ol.geom.MultiPolygon(object.coordinates);
};


/**
 * @param {GeoJSONGeometry} object Object.
 * @private
 * @return {ol.geom.Polygon} Polygon.
 */
ol.format.GeoJSON.readPolygonGeometry_ = function(object) {
  goog.DEBUG && console.assert(object.type == 'Polygon',
      'object.type should be Polygon');
  return new ol.geom.Polygon(object.coordinates);
};


/**
 * @param {ol.geom.Geometry} geometry Geometry.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @private
 * @return {GeoJSONGeometry|GeoJSONGeometryCollection} GeoJSON geometry.
 */
ol.format.GeoJSON.writeGeometry_ = function(geometry, opt_options) {
  var geometryWriter = ol.format.GeoJSON.GEOMETRY_WRITERS_[geometry.getType()];
  return geometryWriter(/** @type {ol.geom.Geometry} */ (
      ol.format.Feature.transformWithOptions(geometry, true, opt_options)),
      opt_options);
};


/**
 * @param {ol.geom.Geometry} geometry Geometry.
 * @private
 * @return {GeoJSONGeometryCollection} Empty GeoJSON geometry collection.
 */
ol.format.GeoJSON.writeEmptyGeometryCollectionGeometry_ = function(geometry) {
  return /** @type {GeoJSONGeometryCollection} */ ({
    type: 'GeometryCollection',
    geometries: []
  });
};


/**
 * @param {ol.geom.GeometryCollection} geometry Geometry.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @private
 * @return {GeoJSONGeometryCollection} GeoJSON geometry collection.
 */
ol.format.GeoJSON.writeGeometryCollectionGeometry_ = function(
    geometry, opt_options) {
  var geometries = geometry.getGeometriesArray().map(function(geometry) {
    var options = ol.obj.assign({}, opt_options);
    delete options.featureProjection;
    return ol.format.GeoJSON.writeGeometry_(geometry, options);
  });
  return /** @type {GeoJSONGeometryCollection} */ ({
    type: 'GeometryCollection',
    geometries: geometries
  });
};


/**
 * @param {ol.geom.LineString} geometry Geometry.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @private
 * @return {GeoJSONGeometry} GeoJSON geometry.
 */
ol.format.GeoJSON.writeLineStringGeometry_ = function(geometry, opt_options) {
  return /** @type {GeoJSONGeometry} */ ({
    type: 'LineString',
    coordinates: geometry.getCoordinates()
  });
};


/**
 * @param {ol.geom.MultiLineString} geometry Geometry.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @private
 * @return {GeoJSONGeometry} GeoJSON geometry.
 */
ol.format.GeoJSON.writeMultiLineStringGeometry_ = function(geometry, opt_options) {
  return /** @type {GeoJSONGeometry} */ ({
    type: 'MultiLineString',
    coordinates: geometry.getCoordinates()
  });
};


/**
 * @param {ol.geom.MultiPoint} geometry Geometry.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @private
 * @return {GeoJSONGeometry} GeoJSON geometry.
 */
ol.format.GeoJSON.writeMultiPointGeometry_ = function(geometry, opt_options) {
  return /** @type {GeoJSONGeometry} */ ({
    type: 'MultiPoint',
    coordinates: geometry.getCoordinates()
  });
};


/**
 * @param {ol.geom.MultiPolygon} geometry Geometry.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @private
 * @return {GeoJSONGeometry} GeoJSON geometry.
 */
ol.format.GeoJSON.writeMultiPolygonGeometry_ = function(geometry, opt_options) {
  var right;
  if (opt_options) {
    right = opt_options.rightHanded;
  }
  return /** @type {GeoJSONGeometry} */ ({
    type: 'MultiPolygon',
    coordinates: geometry.getCoordinates(right)
  });
};


/**
 * @param {ol.geom.Point} geometry Geometry.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @private
 * @return {GeoJSONGeometry} GeoJSON geometry.
 */
ol.format.GeoJSON.writePointGeometry_ = function(geometry, opt_options) {
  return /** @type {GeoJSONGeometry} */ ({
    type: 'Point',
    coordinates: geometry.getCoordinates()
  });
};


/**
 * @param {ol.geom.Polygon} geometry Geometry.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @private
 * @return {GeoJSONGeometry} GeoJSON geometry.
 */
ol.format.GeoJSON.writePolygonGeometry_ = function(geometry, opt_options) {
  var right;
  if (opt_options) {
    right = opt_options.rightHanded;
  }
  return /** @type {GeoJSONGeometry} */ ({
    type: 'Polygon',
    coordinates: geometry.getCoordinates(right)
  });
};


/**
 * @const
 * @private
 * @type {Object.<string, function(GeoJSONObject): ol.geom.Geometry>}
 */
ol.format.GeoJSON.GEOMETRY_READERS_ = {
  'Point': ol.format.GeoJSON.readPointGeometry_,
  'LineString': ol.format.GeoJSON.readLineStringGeometry_,
  'Polygon': ol.format.GeoJSON.readPolygonGeometry_,
  'MultiPoint': ol.format.GeoJSON.readMultiPointGeometry_,
  'MultiLineString': ol.format.GeoJSON.readMultiLineStringGeometry_,
  'MultiPolygon': ol.format.GeoJSON.readMultiPolygonGeometry_,
  'GeometryCollection': ol.format.GeoJSON.readGeometryCollectionGeometry_
};


/**
 * @const
 * @private
 * @type {Object.<string, function(ol.geom.Geometry, olx.format.WriteOptions=): (GeoJSONGeometry|GeoJSONGeometryCollection)>}
 */
ol.format.GeoJSON.GEOMETRY_WRITERS_ = {
  'Point': ol.format.GeoJSON.writePointGeometry_,
  'LineString': ol.format.GeoJSON.writeLineStringGeometry_,
  'Polygon': ol.format.GeoJSON.writePolygonGeometry_,
  'MultiPoint': ol.format.GeoJSON.writeMultiPointGeometry_,
  'MultiLineString': ol.format.GeoJSON.writeMultiLineStringGeometry_,
  'MultiPolygon': ol.format.GeoJSON.writeMultiPolygonGeometry_,
  'GeometryCollection': ol.format.GeoJSON.writeGeometryCollectionGeometry_,
  'Circle': ol.format.GeoJSON.writeEmptyGeometryCollectionGeometry_
};


/**
 * @inheritDoc
 */
ol.format.GeoJSON.prototype.getExtensions = function() {
  return ol.format.GeoJSON.EXTENSIONS_;
};


/**
 * Read a feature from a GeoJSON Feature source.  Only works for Feature,
 * use `readFeatures` to read FeatureCollection source.
 *
 * @function
 * @param {Document|Node|Object|string} source Source.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @return {ol.Feature} Feature.
 * @api stable
 */
ol.format.GeoJSON.prototype.readFeature;


/**
 * Read all features from a GeoJSON source.  Works with both Feature and
 * FeatureCollection sources.
 *
 * @function
 * @param {Document|Node|Object|string} source Source.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @return {Array.<ol.Feature>} Features.
 * @api stable
 */
ol.format.GeoJSON.prototype.readFeatures;


/**
 * @inheritDoc
 */
ol.format.GeoJSON.prototype.readFeatureFromObject = function(
    object, opt_options) {
  var geoJSONFeature = /** @type {GeoJSONFeature} */ (object);
  goog.DEBUG && console.assert(geoJSONFeature.type == 'Feature',
      'geoJSONFeature.type should be Feature');
  var geometry = ol.format.GeoJSON.readGeometry_(geoJSONFeature.geometry,
      opt_options);
  var feature = new ol.Feature();
  if (this.geometryName_) {
    feature.setGeometryName(this.geometryName_);
  }
  feature.setGeometry(geometry);
  if (geoJSONFeature.id !== undefined) {
    feature.setId(geoJSONFeature.id);
  }
  if (geoJSONFeature.properties) {
    feature.setProperties(geoJSONFeature.properties);
  }
  return feature;
};


/**
 * @inheritDoc
 */
ol.format.GeoJSON.prototype.readFeaturesFromObject = function(
    object, opt_options) {
  var geoJSONObject = /** @type {GeoJSONObject} */ (object);
  /** @type {Array.<ol.Feature>} */
  var features;
  if (geoJSONObject.type == 'Feature') {
    features = [this.readFeatureFromObject(object, opt_options)];
  } else if (geoJSONObject.type == 'FeatureCollection') {
    var geoJSONFeatureCollection = /** @type {GeoJSONFeatureCollection} */
        (object);
    features = [];
    var geoJSONFeatures = geoJSONFeatureCollection.features;
    var i, ii;
    for (i = 0, ii = geoJSONFeatures.length; i < ii; ++i) {
      features.push(this.readFeatureFromObject(geoJSONFeatures[i],
          opt_options));
    }
  } else {
    ol.asserts.assert(false, 35); // Unknown GeoJSON object type
  }
  return /** Array.<ol.Feature> */ (features);
};


/**
 * Read a geometry from a GeoJSON source.
 *
 * @function
 * @param {Document|Node|Object|string} source Source.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @return {ol.geom.Geometry} Geometry.
 * @api stable
 */
ol.format.GeoJSON.prototype.readGeometry;


/**
 * @inheritDoc
 */
ol.format.GeoJSON.prototype.readGeometryFromObject = function(
    object, opt_options) {
  return ol.format.GeoJSON.readGeometry_(
      /** @type {GeoJSONGeometry} */ (object), opt_options);
};


/**
 * Read the projection from a GeoJSON source.
 *
 * @function
 * @param {Document|Node|Object|string} source Source.
 * @return {ol.proj.Projection} Projection.
 * @api stable
 */
ol.format.GeoJSON.prototype.readProjection;


/**
 * @inheritDoc
 */
ol.format.GeoJSON.prototype.readProjectionFromObject = function(object) {
  var geoJSONObject = /** @type {GeoJSONObject} */ (object);
  var crs = geoJSONObject.crs;
  var projection;
  if (crs) {
    if (crs.type == 'name') {
      projection = ol.proj.get(crs.properties.name);
    } else if (crs.type == 'EPSG') {
      // 'EPSG' is not part of the GeoJSON specification, but is generated by
      // GeoServer.
      // TODO: remove this when http://jira.codehaus.org/browse/GEOS-5996
      // is fixed and widely deployed.
      projection = ol.proj.get('EPSG:' + crs.properties.code);
    } else {
      ol.asserts.assert(false, 36); // Unknown SRS type
    }
  } else {
    projection = this.defaultDataProjection;
  }
  return /** @type {ol.proj.Projection} */ (projection);
};


/**
 * Encode a feature as a GeoJSON Feature string.
 *
 * @function
 * @param {ol.Feature} feature Feature.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @return {string} GeoJSON.
 * @api stable
 */
ol.format.GeoJSON.prototype.writeFeature;


/**
 * Encode a feature as a GeoJSON Feature object.
 *
 * @param {ol.Feature} feature Feature.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @return {GeoJSONFeature} Object.
 * @api stable
 */
ol.format.GeoJSON.prototype.writeFeatureObject = function(feature, opt_options) {
  opt_options = this.adaptOptions(opt_options);

  var object = /** @type {GeoJSONFeature} */ ({
    'type': 'Feature'
  });
  var id = feature.getId();
  if (id !== undefined) {
    object.id = id;
  }
  var geometry = feature.getGeometry();
  if (geometry) {
    object.geometry =
        ol.format.GeoJSON.writeGeometry_(geometry, opt_options);
  } else {
    object.geometry = null;
  }
  var properties = feature.getProperties();
  delete properties[feature.getGeometryName()];
  if (!ol.obj.isEmpty(properties)) {
    object.properties = properties;
  } else {
    object.properties = null;
  }
  return object;
};


/**
 * Encode an array of features as GeoJSON.
 *
 * @function
 * @param {Array.<ol.Feature>} features Features.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @return {string} GeoJSON.
 * @api stable
 */
ol.format.GeoJSON.prototype.writeFeatures;


/**
 * Encode an array of features as a GeoJSON object.
 *
 * @param {Array.<ol.Feature>} features Features.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @return {GeoJSONFeatureCollection} GeoJSON Object.
 * @api stable
 */
ol.format.GeoJSON.prototype.writeFeaturesObject = function(features, opt_options) {
  opt_options = this.adaptOptions(opt_options);
  var objects = [];
  var i, ii;
  for (i = 0, ii = features.length; i < ii; ++i) {
    objects.push(this.writeFeatureObject(features[i], opt_options));
  }
  return /** @type {GeoJSONFeatureCollection} */ ({
    type: 'FeatureCollection',
    features: objects
  });
};


/**
 * Encode a geometry as a GeoJSON string.
 *
 * @function
 * @param {ol.geom.Geometry} geometry Geometry.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @return {string} GeoJSON.
 * @api stable
 */
ol.format.GeoJSON.prototype.writeGeometry;


/**
 * Encode a geometry as a GeoJSON object.
 *
 * @param {ol.geom.Geometry} geometry Geometry.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @return {GeoJSONGeometry|GeoJSONGeometryCollection} Object.
 * @api stable
 */
ol.format.GeoJSON.prototype.writeGeometryObject = function(geometry,
    opt_options) {
  return ol.format.GeoJSON.writeGeometry_(geometry,
      this.adaptOptions(opt_options));
};

goog.provide('ol.format.XMLFeature');

goog.require('ol');
goog.require('ol.array');
goog.require('ol.format.Feature');
goog.require('ol.format.FormatType');
goog.require('ol.xml');


/**
 * @classdesc
 * Abstract base class; normally only used for creating subclasses and not
 * instantiated in apps.
 * Base class for XML feature formats.
 *
 * @constructor
 * @extends {ol.format.Feature}
 */
ol.format.XMLFeature = function() {

  /**
   * @type {XMLSerializer}
   * @private
   */
  this.xmlSerializer_ = new XMLSerializer();

  ol.format.Feature.call(this);
};
ol.inherits(ol.format.XMLFeature, ol.format.Feature);


/**
 * @inheritDoc
 */
ol.format.XMLFeature.prototype.getType = function() {
  return ol.format.FormatType.XML;
};


/**
 * @inheritDoc
 */
ol.format.XMLFeature.prototype.readFeature = function(source, opt_options) {
  if (ol.xml.isDocument(source)) {
    return this.readFeatureFromDocument(
        /** @type {Document} */ (source), opt_options);
  } else if (ol.xml.isNode(source)) {
    return this.readFeatureFromNode(/** @type {Node} */ (source), opt_options);
  } else if (typeof source === 'string') {
    var doc = ol.xml.parse(source);
    return this.readFeatureFromDocument(doc, opt_options);
  } else {
    return null;
  }
};


/**
 * @param {Document} doc Document.
 * @param {olx.format.ReadOptions=} opt_options Options.
 * @return {ol.Feature} Feature.
 */
ol.format.XMLFeature.prototype.readFeatureFromDocument = function(
    doc, opt_options) {
  var features = this.readFeaturesFromDocument(doc, opt_options);
  if (features.length > 0) {
    return features[0];
  } else {
    return null;
  }
};


/**
 * @abstract
 * @param {Node} node Node.
 * @param {olx.format.ReadOptions=} opt_options Options.
 * @return {ol.Feature} Feature.
 */
ol.format.XMLFeature.prototype.readFeatureFromNode = function(node, opt_options) {};


/**
 * @inheritDoc
 */
ol.format.XMLFeature.prototype.readFeatures = function(source, opt_options) {
  if (ol.xml.isDocument(source)) {
    return this.readFeaturesFromDocument(
        /** @type {Document} */ (source), opt_options);
  } else if (ol.xml.isNode(source)) {
    return this.readFeaturesFromNode(/** @type {Node} */ (source), opt_options);
  } else if (typeof source === 'string') {
    var doc = ol.xml.parse(source);
    return this.readFeaturesFromDocument(doc, opt_options);
  } else {
    return [];
  }
};


/**
 * @param {Document} doc Document.
 * @param {olx.format.ReadOptions=} opt_options Options.
 * @protected
 * @return {Array.<ol.Feature>} Features.
 */
ol.format.XMLFeature.prototype.readFeaturesFromDocument = function(
    doc, opt_options) {
  /** @type {Array.<ol.Feature>} */
  var features = [];
  var n;
  for (n = doc.firstChild; n; n = n.nextSibling) {
    if (n.nodeType == Node.ELEMENT_NODE) {
      ol.array.extend(features, this.readFeaturesFromNode(n, opt_options));
    }
  }
  return features;
};


/**
 * @abstract
 * @param {Node} node Node.
 * @param {olx.format.ReadOptions=} opt_options Options.
 * @protected
 * @return {Array.<ol.Feature>} Features.
 */
ol.format.XMLFeature.prototype.readFeaturesFromNode = function(node, opt_options) {};


/**
 * @inheritDoc
 */
ol.format.XMLFeature.prototype.readGeometry = function(source, opt_options) {
  if (ol.xml.isDocument(source)) {
    return this.readGeometryFromDocument(
        /** @type {Document} */ (source), opt_options);
  } else if (ol.xml.isNode(source)) {
    return this.readGeometryFromNode(/** @type {Node} */ (source), opt_options);
  } else if (typeof source === 'string') {
    var doc = ol.xml.parse(source);
    return this.readGeometryFromDocument(doc, opt_options);
  } else {
    return null;
  }
};


/**
 * @abstract
 * @param {Document} doc Document.
 * @param {olx.format.ReadOptions=} opt_options Options.
 * @protected
 * @return {ol.geom.Geometry} Geometry.
 */
ol.format.XMLFeature.prototype.readGeometryFromDocument = function(doc, opt_options) {};


/**
 * @abstract
 * @param {Node} node Node.
 * @param {olx.format.ReadOptions=} opt_options Options.
 * @protected
 * @return {ol.geom.Geometry} Geometry.
 */
ol.format.XMLFeature.prototype.readGeometryFromNode = function(node, opt_options) {};


/**
 * @inheritDoc
 */
ol.format.XMLFeature.prototype.readProjection = function(source) {
  if (ol.xml.isDocument(source)) {
    return this.readProjectionFromDocument(/** @type {Document} */ (source));
  } else if (ol.xml.isNode(source)) {
    return this.readProjectionFromNode(/** @type {Node} */ (source));
  } else if (typeof source === 'string') {
    var doc = ol.xml.parse(source);
    return this.readProjectionFromDocument(doc);
  } else {
    return null;
  }
};


/**
 * @param {Document} doc Document.
 * @protected
 * @return {ol.proj.Projection} Projection.
 */
ol.format.XMLFeature.prototype.readProjectionFromDocument = function(doc) {
  return this.defaultDataProjection;
};


/**
 * @param {Node} node Node.
 * @protected
 * @return {ol.proj.Projection} Projection.
 */
ol.format.XMLFeature.prototype.readProjectionFromNode = function(node) {
  return this.defaultDataProjection;
};


/**
 * @inheritDoc
 */
ol.format.XMLFeature.prototype.writeFeature = function(feature, opt_options) {
  var node = this.writeFeatureNode(feature, opt_options);
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  return this.xmlSerializer_.serializeToString(node);
};


/**
 * @abstract
 * @param {ol.Feature} feature Feature.
 * @param {olx.format.WriteOptions=} opt_options Options.
 * @protected
 * @return {Node} Node.
 */
ol.format.XMLFeature.prototype.writeFeatureNode = function(feature, opt_options) {};


/**
 * @inheritDoc
 */
ol.format.XMLFeature.prototype.writeFeatures = function(features, opt_options) {
  var node = this.writeFeaturesNode(features, opt_options);
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  return this.xmlSerializer_.serializeToString(node);
};


/**
 * @abstract
 * @param {Array.<ol.Feature>} features Features.
 * @param {olx.format.WriteOptions=} opt_options Options.
 * @return {Node} Node.
 */
ol.format.XMLFeature.prototype.writeFeaturesNode = function(features, opt_options) {};


/**
 * @inheritDoc
 */
ol.format.XMLFeature.prototype.writeGeometry = function(geometry, opt_options) {
  var node = this.writeGeometryNode(geometry, opt_options);
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  return this.xmlSerializer_.serializeToString(node);
};


/**
 * @abstract
 * @param {ol.geom.Geometry} geometry Geometry.
 * @param {olx.format.WriteOptions=} opt_options Options.
 * @return {Node} Node.
 */
ol.format.XMLFeature.prototype.writeGeometryNode = function(geometry, opt_options) {};

// FIXME Envelopes should not be treated as geometries! readEnvelope_ is part
// of GEOMETRY_PARSERS_ and methods using GEOMETRY_PARSERS_ do not expect
// envelopes/extents, only geometries!
goog.provide('ol.format.GMLBase');

goog.require('ol');
goog.require('ol.array');
goog.require('ol.Feature');
goog.require('ol.format.Feature');
goog.require('ol.format.XMLFeature');
goog.require('ol.geom.GeometryLayout');
goog.require('ol.geom.LineString');
goog.require('ol.geom.LinearRing');
goog.require('ol.geom.MultiLineString');
goog.require('ol.geom.MultiPoint');
goog.require('ol.geom.MultiPolygon');
goog.require('ol.geom.Point');
goog.require('ol.geom.Polygon');
goog.require('ol.obj');
goog.require('ol.proj');
goog.require('ol.xml');


/**
 * @classdesc
 * Abstract base class; normally only used for creating subclasses and not
 * instantiated in apps.
 * Feature base format for reading and writing data in the GML format.
 * This class cannot be instantiated, it contains only base content that
 * is shared with versioned format classes ol.format.GML2 and
 * ol.format.GML3.
 *
 * @constructor
 * @param {olx.format.GMLOptions=} opt_options
 *     Optional configuration object.
 * @extends {ol.format.XMLFeature}
 */
ol.format.GMLBase = function(opt_options) {
  var options = /** @type {olx.format.GMLOptions} */
      (opt_options ? opt_options : {});

  /**
   * @protected
   * @type {Array.<string>|string|undefined}
   */
  this.featureType = options.featureType;

  /**
   * @protected
   * @type {Object.<string, string>|string|undefined}
   */
  this.featureNS = options.featureNS;

  /**
   * @protected
   * @type {string}
   */
  this.srsName = options.srsName;

  /**
   * @protected
   * @type {string}
   */
  this.schemaLocation = '';

  /**
   * @type {Object.<string, Object.<string, Object>>}
   */
  this.FEATURE_COLLECTION_PARSERS = {};
  this.FEATURE_COLLECTION_PARSERS[ol.format.GMLBase.GMLNS] = {
    'featureMember': ol.xml.makeReplacer(
        ol.format.GMLBase.prototype.readFeaturesInternal),
    'featureMembers': ol.xml.makeReplacer(
        ol.format.GMLBase.prototype.readFeaturesInternal)
  };

  ol.format.XMLFeature.call(this);
};
ol.inherits(ol.format.GMLBase, ol.format.XMLFeature);


/**
 * @const
 * @type {string}
 */
ol.format.GMLBase.GMLNS = 'http://www.opengis.net/gml';


/**
 * A regular expression that matches if a string only contains whitespace
 * characters. It will e.g. match `''`, `' '`, `'\n'` etc. The non-breaking
 * space (0xa0) is explicitly included as IE doesn't include it in its
 * definition of `\s`.
 *
 * Information from `goog.string.isEmptyOrWhitespace`: https://github.com/google/closure-library/blob/e877b1e/closure/goog/string/string.js#L156-L160
 *
 * @const
 * @type {RegExp}
 * @private
 */
ol.format.GMLBase.ONLY_WHITESPACE_RE_ = /^[\s\xa0]*$/;


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {Array.<ol.Feature> | undefined} Features.
 */
ol.format.GMLBase.prototype.readFeaturesInternal = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  var localName = node.localName;
  var features = null;
  if (localName == 'FeatureCollection') {
    if (node.namespaceURI === 'http://www.opengis.net/wfs') {
      features = ol.xml.pushParseAndPop([],
          this.FEATURE_COLLECTION_PARSERS, node,
          objectStack, this);
    } else {
      features = ol.xml.pushParseAndPop(null,
          this.FEATURE_COLLECTION_PARSERS, node,
          objectStack, this);
    }
  } else if (localName == 'featureMembers' || localName == 'featureMember') {
    var context = objectStack[0];
    var featureType = context['featureType'];
    var featureNS = context['featureNS'];
    var i, ii, prefix = 'p', defaultPrefix = 'p0';
    if (!featureType && node.childNodes) {
      featureType = [], featureNS = {};
      for (i = 0, ii = node.childNodes.length; i < ii; ++i) {
        var child = node.childNodes[i];
        if (child.nodeType === 1) {
          var ft = child.nodeName.split(':').pop();
          if (featureType.indexOf(ft) === -1) {
            var key = '';
            var count = 0;
            var uri = child.namespaceURI;
            for (var candidate in featureNS) {
              if (featureNS[candidate] === uri) {
                key = candidate;
                break;
              }
              ++count;
            }
            if (!key) {
              key = prefix + count;
              featureNS[key] = uri;
            }
            featureType.push(key + ':' + ft);
          }
        }
      }
      if (localName != 'featureMember') {
        // recheck featureType for each featureMember
        context['featureType'] = featureType;
        context['featureNS'] = featureNS;
      }
    }
    if (typeof featureNS === 'string') {
      var ns = featureNS;
      featureNS = {};
      featureNS[defaultPrefix] = ns;
    }
    var parsersNS = {};
    var featureTypes = Array.isArray(featureType) ? featureType : [featureType];
    for (var p in featureNS) {
      var parsers = {};
      for (i = 0, ii = featureTypes.length; i < ii; ++i) {
        var featurePrefix = featureTypes[i].indexOf(':') === -1 ?
            defaultPrefix : featureTypes[i].split(':')[0];
        if (featurePrefix === p) {
          parsers[featureTypes[i].split(':').pop()] =
              (localName == 'featureMembers') ?
              ol.xml.makeArrayPusher(this.readFeatureElement, this) :
              ol.xml.makeReplacer(this.readFeatureElement, this);
        }
      }
      parsersNS[featureNS[p]] = parsers;
    }
    if (localName == 'featureMember') {
      features = ol.xml.pushParseAndPop(undefined, parsersNS, node, objectStack);
    } else {
      features = ol.xml.pushParseAndPop([], parsersNS, node, objectStack);
    }
  }
  if (features === null) {
    features = [];
  }
  return features;
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {ol.geom.Geometry|undefined} Geometry.
 */
ol.format.GMLBase.prototype.readGeometryElement = function(node, objectStack) {
  var context = /** @type {Object} */ (objectStack[0]);
  context['srsName'] = node.firstElementChild.getAttribute('srsName');
  /** @type {ol.geom.Geometry} */
  var geometry = ol.xml.pushParseAndPop(null,
      this.GEOMETRY_PARSERS_, node, objectStack, this);
  if (geometry) {
    return /** @type {ol.geom.Geometry} */ (
        ol.format.Feature.transformWithOptions(geometry, false, context));
  } else {
    return undefined;
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {ol.Feature} Feature.
 */
ol.format.GMLBase.prototype.readFeatureElement = function(node, objectStack) {
  var n;
  var fid = node.getAttribute('fid') ||
      ol.xml.getAttributeNS(node, ol.format.GMLBase.GMLNS, 'id');
  var values = {}, geometryName;
  for (n = node.firstElementChild; n; n = n.nextElementSibling) {
    var localName = n.localName;
    // Assume attribute elements have one child node and that the child
    // is a text or CDATA node (to be treated as text).
    // Otherwise assume it is a geometry node.
    if (n.childNodes.length === 0 ||
        (n.childNodes.length === 1 &&
        (n.firstChild.nodeType === 3 || n.firstChild.nodeType === 4))) {
      var value = ol.xml.getAllTextContent(n, false);
      if (ol.format.GMLBase.ONLY_WHITESPACE_RE_.test(value)) {
        value = undefined;
      }
      values[localName] = value;
    } else {
      // boundedBy is an extent and must not be considered as a geometry
      if (localName !== 'boundedBy') {
        geometryName = localName;
      }
      values[localName] = this.readGeometryElement(n, objectStack);
    }
  }
  var feature = new ol.Feature(values);
  if (geometryName) {
    feature.setGeometryName(geometryName);
  }
  if (fid) {
    feature.setId(fid);
  }
  return feature;
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {ol.geom.Point|undefined} Point.
 */
ol.format.GMLBase.prototype.readPoint = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Point', 'localName should be Point');
  var flatCoordinates =
      this.readFlatCoordinatesFromNode_(node, objectStack);
  if (flatCoordinates) {
    var point = new ol.geom.Point(null);
    goog.DEBUG && console.assert(flatCoordinates.length == 3,
        'flatCoordinates should have a length of 3');
    point.setFlatCoordinates(ol.geom.GeometryLayout.XYZ, flatCoordinates);
    return point;
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {ol.geom.MultiPoint|undefined} MultiPoint.
 */
ol.format.GMLBase.prototype.readMultiPoint = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'MultiPoint',
      'localName should be MultiPoint');
  /** @type {Array.<Array.<number>>} */
  var coordinates = ol.xml.pushParseAndPop([],
      this.MULTIPOINT_PARSERS_, node, objectStack, this);
  if (coordinates) {
    return new ol.geom.MultiPoint(coordinates);
  } else {
    return undefined;
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {ol.geom.MultiLineString|undefined} MultiLineString.
 */
ol.format.GMLBase.prototype.readMultiLineString = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'MultiLineString',
      'localName should be MultiLineString');
  /** @type {Array.<ol.geom.LineString>} */
  var lineStrings = ol.xml.pushParseAndPop([],
      this.MULTILINESTRING_PARSERS_, node, objectStack, this);
  if (lineStrings) {
    var multiLineString = new ol.geom.MultiLineString(null);
    multiLineString.setLineStrings(lineStrings);
    return multiLineString;
  } else {
    return undefined;
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {ol.geom.MultiPolygon|undefined} MultiPolygon.
 */
ol.format.GMLBase.prototype.readMultiPolygon = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'MultiPolygon',
      'localName should be MultiPolygon');
  /** @type {Array.<ol.geom.Polygon>} */
  var polygons = ol.xml.pushParseAndPop([],
      this.MULTIPOLYGON_PARSERS_, node, objectStack, this);
  if (polygons) {
    var multiPolygon = new ol.geom.MultiPolygon(null);
    multiPolygon.setPolygons(polygons);
    return multiPolygon;
  } else {
    return undefined;
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.GMLBase.prototype.pointMemberParser_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'pointMember' ||
      node.localName == 'pointMembers',
      'localName should be pointMember or pointMembers');
  ol.xml.parseNode(this.POINTMEMBER_PARSERS_,
      node, objectStack, this);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.GMLBase.prototype.lineStringMemberParser_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'lineStringMember' ||
      node.localName == 'lineStringMembers',
      'localName should be LineStringMember or LineStringMembers');
  ol.xml.parseNode(this.LINESTRINGMEMBER_PARSERS_,
      node, objectStack, this);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.GMLBase.prototype.polygonMemberParser_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'polygonMember' ||
      node.localName == 'polygonMembers',
      'localName should be polygonMember or polygonMembers');
  ol.xml.parseNode(this.POLYGONMEMBER_PARSERS_, node,
      objectStack, this);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {ol.geom.LineString|undefined} LineString.
 */
ol.format.GMLBase.prototype.readLineString = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'LineString',
      'localName should be LineString');
  var flatCoordinates =
      this.readFlatCoordinatesFromNode_(node, objectStack);
  if (flatCoordinates) {
    var lineString = new ol.geom.LineString(null);
    lineString.setFlatCoordinates(ol.geom.GeometryLayout.XYZ, flatCoordinates);
    return lineString;
  } else {
    return undefined;
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Array.<number>|undefined} LinearRing flat coordinates.
 */
ol.format.GMLBase.prototype.readFlatLinearRing_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'LinearRing',
      'localName should be LinearRing');
  var ring = ol.xml.pushParseAndPop(null,
      this.GEOMETRY_FLAT_COORDINATES_PARSERS_, node,
      objectStack, this);
  if (ring) {
    return ring;
  } else {
    return undefined;
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {ol.geom.LinearRing|undefined} LinearRing.
 */
ol.format.GMLBase.prototype.readLinearRing = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'LinearRing',
      'localName should be LinearRing');
  var flatCoordinates =
      this.readFlatCoordinatesFromNode_(node, objectStack);
  if (flatCoordinates) {
    var ring = new ol.geom.LinearRing(null);
    ring.setFlatCoordinates(ol.geom.GeometryLayout.XYZ, flatCoordinates);
    return ring;
  } else {
    return undefined;
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {ol.geom.Polygon|undefined} Polygon.
 */
ol.format.GMLBase.prototype.readPolygon = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Polygon',
      'localName should be Polygon');
  /** @type {Array.<Array.<number>>} */
  var flatLinearRings = ol.xml.pushParseAndPop([null],
      this.FLAT_LINEAR_RINGS_PARSERS_, node, objectStack, this);
  if (flatLinearRings && flatLinearRings[0]) {
    var polygon = new ol.geom.Polygon(null);
    var flatCoordinates = flatLinearRings[0];
    var ends = [flatCoordinates.length];
    var i, ii;
    for (i = 1, ii = flatLinearRings.length; i < ii; ++i) {
      ol.array.extend(flatCoordinates, flatLinearRings[i]);
      ends.push(flatCoordinates.length);
    }
    polygon.setFlatCoordinates(
        ol.geom.GeometryLayout.XYZ, flatCoordinates, ends);
    return polygon;
  } else {
    return undefined;
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Array.<number>} Flat coordinates.
 */
ol.format.GMLBase.prototype.readFlatCoordinatesFromNode_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  return ol.xml.pushParseAndPop(null,
      this.GEOMETRY_FLAT_COORDINATES_PARSERS_, node,
      objectStack, this);
};


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.GMLBase.prototype.MULTIPOINT_PARSERS_ = {
  'http://www.opengis.net/gml' : {
    'pointMember': ol.xml.makeArrayPusher(
        ol.format.GMLBase.prototype.pointMemberParser_),
    'pointMembers': ol.xml.makeArrayPusher(
        ol.format.GMLBase.prototype.pointMemberParser_)
  }
};


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.GMLBase.prototype.MULTILINESTRING_PARSERS_ = {
  'http://www.opengis.net/gml' : {
    'lineStringMember': ol.xml.makeArrayPusher(
        ol.format.GMLBase.prototype.lineStringMemberParser_),
    'lineStringMembers': ol.xml.makeArrayPusher(
        ol.format.GMLBase.prototype.lineStringMemberParser_)
  }
};


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.GMLBase.prototype.MULTIPOLYGON_PARSERS_ = {
  'http://www.opengis.net/gml' : {
    'polygonMember': ol.xml.makeArrayPusher(
        ol.format.GMLBase.prototype.polygonMemberParser_),
    'polygonMembers': ol.xml.makeArrayPusher(
        ol.format.GMLBase.prototype.polygonMemberParser_)
  }
};


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.GMLBase.prototype.POINTMEMBER_PARSERS_ = {
  'http://www.opengis.net/gml' : {
    'Point': ol.xml.makeArrayPusher(
        ol.format.GMLBase.prototype.readFlatCoordinatesFromNode_)
  }
};


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.GMLBase.prototype.LINESTRINGMEMBER_PARSERS_ = {
  'http://www.opengis.net/gml' : {
    'LineString': ol.xml.makeArrayPusher(
        ol.format.GMLBase.prototype.readLineString)
  }
};


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.GMLBase.prototype.POLYGONMEMBER_PARSERS_ = {
  'http://www.opengis.net/gml' : {
    'Polygon': ol.xml.makeArrayPusher(
        ol.format.GMLBase.prototype.readPolygon)
  }
};


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @protected
 */
ol.format.GMLBase.prototype.RING_PARSERS = {
  'http://www.opengis.net/gml' : {
    'LinearRing': ol.xml.makeReplacer(
        ol.format.GMLBase.prototype.readFlatLinearRing_)
  }
};


/**
 * @inheritDoc
 */
ol.format.GMLBase.prototype.readGeometryFromNode = function(node, opt_options) {
  var geometry = this.readGeometryElement(node,
      [this.getReadOptions(node, opt_options ? opt_options : {})]);
  return geometry ? geometry : null;
};


/**
 * Read all features from a GML FeatureCollection.
 *
 * @function
 * @param {Document|Node|Object|string} source Source.
 * @param {olx.format.ReadOptions=} opt_options Options.
 * @return {Array.<ol.Feature>} Features.
 * @api stable
 */
ol.format.GMLBase.prototype.readFeatures;


/**
 * @inheritDoc
 */
ol.format.GMLBase.prototype.readFeaturesFromNode = function(node, opt_options) {
  var options = {
    featureType: this.featureType,
    featureNS: this.featureNS
  };
  if (opt_options) {
    ol.obj.assign(options, this.getReadOptions(node, opt_options));
  }
  var features = this.readFeaturesInternal(node, [options]);
  return features || [];
};


/**
 * @inheritDoc
 */
ol.format.GMLBase.prototype.readProjectionFromNode = function(node) {
  return ol.proj.get(this.srsName ? this.srsName :
      node.firstElementChild.getAttribute('srsName'));
};

goog.provide('ol.format.XSD');

goog.require('ol');
goog.require('ol.xml');
goog.require('ol.string');


/**
 * @const
 * @type {string}
 */
ol.format.XSD.NAMESPACE_URI = 'http://www.w3.org/2001/XMLSchema';


/**
 * @param {Node} node Node.
 * @return {boolean|undefined} Boolean.
 */
ol.format.XSD.readBoolean = function(node) {
  var s = ol.xml.getAllTextContent(node, false);
  return ol.format.XSD.readBooleanString(s);
};


/**
 * @param {string} string String.
 * @return {boolean|undefined} Boolean.
 */
ol.format.XSD.readBooleanString = function(string) {
  var m = /^\s*(true|1)|(false|0)\s*$/.exec(string);
  if (m) {
    return m[1] !== undefined || false;
  } else {
    return undefined;
  }
};


/**
 * @param {Node} node Node.
 * @return {number|undefined} DateTime in seconds.
 */
ol.format.XSD.readDateTime = function(node) {
  var s = ol.xml.getAllTextContent(node, false);
  var dateTime = Date.parse(s);
  return isNaN(dateTime) ? undefined : dateTime / 1000;
};


/**
 * @param {Node} node Node.
 * @return {number|undefined} Decimal.
 */
ol.format.XSD.readDecimal = function(node) {
  var s = ol.xml.getAllTextContent(node, false);
  return ol.format.XSD.readDecimalString(s);
};


/**
 * @param {string} string String.
 * @return {number|undefined} Decimal.
 */
ol.format.XSD.readDecimalString = function(string) {
  // FIXME check spec
  var m = /^\s*([+\-]?\d*\.?\d+(?:e[+\-]?\d+)?)\s*$/i.exec(string);
  if (m) {
    return parseFloat(m[1]);
  } else {
    return undefined;
  }
};


/**
 * @param {Node} node Node.
 * @return {number|undefined} Non negative integer.
 */
ol.format.XSD.readNonNegativeInteger = function(node) {
  var s = ol.xml.getAllTextContent(node, false);
  return ol.format.XSD.readNonNegativeIntegerString(s);
};


/**
 * @param {string} string String.
 * @return {number|undefined} Non negative integer.
 */
ol.format.XSD.readNonNegativeIntegerString = function(string) {
  var m = /^\s*(\d+)\s*$/.exec(string);
  if (m) {
    return parseInt(m[1], 10);
  } else {
    return undefined;
  }
};


/**
 * @param {Node} node Node.
 * @return {string|undefined} String.
 */
ol.format.XSD.readString = function(node) {
  return ol.xml.getAllTextContent(node, false).trim();
};


/**
 * @param {Node} node Node to append a TextNode with the boolean to.
 * @param {boolean} bool Boolean.
 */
ol.format.XSD.writeBooleanTextNode = function(node, bool) {
  ol.format.XSD.writeStringTextNode(node, (bool) ? '1' : '0');
};


/**
 * @param {Node} node Node to append a TextNode with the dateTime to.
 * @param {number} dateTime DateTime in seconds.
 */
ol.format.XSD.writeDateTimeTextNode = function(node, dateTime) {
  var date = new Date(dateTime * 1000);
  var string = date.getUTCFullYear() + '-' +
      ol.string.padNumber(date.getUTCMonth() + 1, 2) + '-' +
      ol.string.padNumber(date.getUTCDate(), 2) + 'T' +
      ol.string.padNumber(date.getUTCHours(), 2) + ':' +
      ol.string.padNumber(date.getUTCMinutes(), 2) + ':' +
      ol.string.padNumber(date.getUTCSeconds(), 2) + 'Z';
  node.appendChild(ol.xml.DOCUMENT.createTextNode(string));
};


/**
 * @param {Node} node Node to append a TextNode with the decimal to.
 * @param {number} decimal Decimal.
 */
ol.format.XSD.writeDecimalTextNode = function(node, decimal) {
  var string = decimal.toPrecision();
  node.appendChild(ol.xml.DOCUMENT.createTextNode(string));
};


/**
 * @param {Node} node Node to append a TextNode with the decimal to.
 * @param {number} nonNegativeInteger Non negative integer.
 */
ol.format.XSD.writeNonNegativeIntegerTextNode = function(node, nonNegativeInteger) {
  goog.DEBUG && console.assert(nonNegativeInteger >= 0, 'value should be more than 0');
  goog.DEBUG && console.assert(nonNegativeInteger == (nonNegativeInteger | 0),
      'value should be an integer value');
  var string = nonNegativeInteger.toString();
  node.appendChild(ol.xml.DOCUMENT.createTextNode(string));
};


/**
 * @param {Node} node Node to append a TextNode with the string to.
 * @param {string} string String.
 */
ol.format.XSD.writeStringTextNode = function(node, string) {
  node.appendChild(ol.xml.DOCUMENT.createTextNode(string));
};

goog.provide('ol.format.GML3');

goog.require('ol');
goog.require('ol.array');
goog.require('ol.extent');
goog.require('ol.format.Feature');
goog.require('ol.format.GMLBase');
goog.require('ol.format.XSD');
goog.require('ol.geom.Geometry');
goog.require('ol.geom.GeometryLayout');
goog.require('ol.geom.LineString');
goog.require('ol.geom.MultiLineString');
goog.require('ol.geom.MultiPolygon');
goog.require('ol.geom.Polygon');
goog.require('ol.obj');
goog.require('ol.proj');
goog.require('ol.xml');


/**
 * @classdesc
 * Feature format for reading and writing data in the GML format
 * version 3.1.1.
 * Currently only supports GML 3.1.1 Simple Features profile.
 *
 * @constructor
 * @param {olx.format.GMLOptions=} opt_options
 *     Optional configuration object.
 * @extends {ol.format.GMLBase}
 * @api
 */
ol.format.GML3 = function(opt_options) {
  var options = /** @type {olx.format.GMLOptions} */
      (opt_options ? opt_options : {});

  ol.format.GMLBase.call(this, options);

  /**
   * @private
   * @type {boolean}
   */
  this.surface_ = options.surface !== undefined ? options.surface : false;

  /**
   * @private
   * @type {boolean}
   */
  this.curve_ = options.curve !== undefined ? options.curve : false;

  /**
   * @private
   * @type {boolean}
   */
  this.multiCurve_ = options.multiCurve !== undefined ?
      options.multiCurve : true;

  /**
   * @private
   * @type {boolean}
   */
  this.multiSurface_ = options.multiSurface !== undefined ?
      options.multiSurface : true;

  /**
   * @inheritDoc
   */
  this.schemaLocation = options.schemaLocation ?
      options.schemaLocation : ol.format.GML3.schemaLocation_;

};
ol.inherits(ol.format.GML3, ol.format.GMLBase);


/**
 * @const
 * @type {string}
 * @private
 */
ol.format.GML3.schemaLocation_ = ol.format.GMLBase.GMLNS +
    ' http://schemas.opengis.net/gml/3.1.1/profiles/gmlsfProfile/' +
    '1.0.0/gmlsf.xsd';


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {ol.geom.MultiLineString|undefined} MultiLineString.
 */
ol.format.GML3.prototype.readMultiCurve_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'MultiCurve',
      'localName should be MultiCurve');
  /** @type {Array.<ol.geom.LineString>} */
  var lineStrings = ol.xml.pushParseAndPop([],
      this.MULTICURVE_PARSERS_, node, objectStack, this);
  if (lineStrings) {
    var multiLineString = new ol.geom.MultiLineString(null);
    multiLineString.setLineStrings(lineStrings);
    return multiLineString;
  } else {
    return undefined;
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {ol.geom.MultiPolygon|undefined} MultiPolygon.
 */
ol.format.GML3.prototype.readMultiSurface_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'MultiSurface',
      'localName should be MultiSurface');
  /** @type {Array.<ol.geom.Polygon>} */
  var polygons = ol.xml.pushParseAndPop([],
      this.MULTISURFACE_PARSERS_, node, objectStack, this);
  if (polygons) {
    var multiPolygon = new ol.geom.MultiPolygon(null);
    multiPolygon.setPolygons(polygons);
    return multiPolygon;
  } else {
    return undefined;
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.GML3.prototype.curveMemberParser_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'curveMember' ||
      node.localName == 'curveMembers',
      'localName should be curveMember or curveMembers');
  ol.xml.parseNode(this.CURVEMEMBER_PARSERS_, node, objectStack, this);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.GML3.prototype.surfaceMemberParser_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'surfaceMember' ||
      node.localName == 'surfaceMembers',
      'localName should be surfaceMember or surfaceMembers');
  ol.xml.parseNode(this.SURFACEMEMBER_PARSERS_,
      node, objectStack, this);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Array.<(Array.<number>)>|undefined} flat coordinates.
 */
ol.format.GML3.prototype.readPatch_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'patches',
      'localName should be patches');
  return ol.xml.pushParseAndPop([null],
      this.PATCHES_PARSERS_, node, objectStack, this);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Array.<number>|undefined} flat coordinates.
 */
ol.format.GML3.prototype.readSegment_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'segments',
      'localName should be segments');
  return ol.xml.pushParseAndPop([null],
      this.SEGMENTS_PARSERS_, node, objectStack, this);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Array.<(Array.<number>)>|undefined} flat coordinates.
 */
ol.format.GML3.prototype.readPolygonPatch_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'npde.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'PolygonPatch',
      'localName should be PolygonPatch');
  return ol.xml.pushParseAndPop([null],
      this.FLAT_LINEAR_RINGS_PARSERS_, node, objectStack, this);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Array.<number>|undefined} flat coordinates.
 */
ol.format.GML3.prototype.readLineStringSegment_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'LineStringSegment',
      'localName should be LineStringSegment');
  return ol.xml.pushParseAndPop([null],
      this.GEOMETRY_FLAT_COORDINATES_PARSERS_,
      node, objectStack, this);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.GML3.prototype.interiorParser_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'interior',
      'localName should be interior');
  /** @type {Array.<number>|undefined} */
  var flatLinearRing = ol.xml.pushParseAndPop(undefined,
      this.RING_PARSERS, node, objectStack, this);
  if (flatLinearRing) {
    var flatLinearRings = /** @type {Array.<Array.<number>>} */
        (objectStack[objectStack.length - 1]);
    goog.DEBUG && console.assert(Array.isArray(flatLinearRings),
        'flatLinearRings should be an array');
    goog.DEBUG && console.assert(flatLinearRings.length > 0,
        'flatLinearRings should have an array length of 1 or more');
    flatLinearRings.push(flatLinearRing);
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.GML3.prototype.exteriorParser_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'exterior',
      'localName should be exterior');
   /** @type {Array.<number>|undefined} */
  var flatLinearRing = ol.xml.pushParseAndPop(undefined,
      this.RING_PARSERS, node, objectStack, this);
  if (flatLinearRing) {
    var flatLinearRings = /** @type {Array.<Array.<number>>} */
        (objectStack[objectStack.length - 1]);
    goog.DEBUG && console.assert(Array.isArray(flatLinearRings),
        'flatLinearRings should be an array');
    goog.DEBUG && console.assert(flatLinearRings.length > 0,
        'flatLinearRings should have an array length of 1 or more');
    flatLinearRings[0] = flatLinearRing;
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {ol.geom.Polygon|undefined} Polygon.
 */
ol.format.GML3.prototype.readSurface_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Surface',
      'localName should be Surface');
  /** @type {Array.<Array.<number>>} */
  var flatLinearRings = ol.xml.pushParseAndPop([null],
      this.SURFACE_PARSERS_, node, objectStack, this);
  if (flatLinearRings && flatLinearRings[0]) {
    var polygon = new ol.geom.Polygon(null);
    var flatCoordinates = flatLinearRings[0];
    var ends = [flatCoordinates.length];
    var i, ii;
    for (i = 1, ii = flatLinearRings.length; i < ii; ++i) {
      ol.array.extend(flatCoordinates, flatLinearRings[i]);
      ends.push(flatCoordinates.length);
    }
    polygon.setFlatCoordinates(
        ol.geom.GeometryLayout.XYZ, flatCoordinates, ends);
    return polygon;
  } else {
    return undefined;
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {ol.geom.LineString|undefined} LineString.
 */
ol.format.GML3.prototype.readCurve_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Curve', 'localName should be Curve');
  /** @type {Array.<number>} */
  var flatCoordinates = ol.xml.pushParseAndPop([null],
      this.CURVE_PARSERS_, node, objectStack, this);
  if (flatCoordinates) {
    var lineString = new ol.geom.LineString(null);
    lineString.setFlatCoordinates(ol.geom.GeometryLayout.XYZ, flatCoordinates);
    return lineString;
  } else {
    return undefined;
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {ol.Extent|undefined} Envelope.
 */
ol.format.GML3.prototype.readEnvelope_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Envelope',
      'localName should be Envelope');
  /** @type {Array.<number>} */
  var flatCoordinates = ol.xml.pushParseAndPop([null],
      this.ENVELOPE_PARSERS_, node, objectStack, this);
  return ol.extent.createOrUpdate(flatCoordinates[1][0],
      flatCoordinates[1][1], flatCoordinates[2][0],
      flatCoordinates[2][1]);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Array.<number>|undefined} Flat coordinates.
 */
ol.format.GML3.prototype.readFlatPos_ = function(node, objectStack) {
  var s = ol.xml.getAllTextContent(node, false);
  var re = /^\s*([+\-]?\d*\.?\d+(?:[eE][+\-]?\d+)?)\s*/;
  /** @type {Array.<number>} */
  var flatCoordinates = [];
  var m;
  while ((m = re.exec(s))) {
    flatCoordinates.push(parseFloat(m[1]));
    s = s.substr(m[0].length);
  }
  if (s !== '') {
    return undefined;
  }
  var context = objectStack[0];
  var containerSrs = context['srsName'];
  var axisOrientation = 'enu';
  if (containerSrs) {
    var proj = ol.proj.get(containerSrs);
    axisOrientation = proj.getAxisOrientation();
  }
  if (axisOrientation === 'neu') {
    var i, ii;
    for (i = 0, ii = flatCoordinates.length; i < ii; i += 3) {
      var y = flatCoordinates[i];
      var x = flatCoordinates[i + 1];
      flatCoordinates[i] = x;
      flatCoordinates[i + 1] = y;
    }
  }
  var len = flatCoordinates.length;
  if (len == 2) {
    flatCoordinates.push(0);
  }
  if (len === 0) {
    return undefined;
  }
  return flatCoordinates;
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Array.<number>|undefined} Flat coordinates.
 */
ol.format.GML3.prototype.readFlatPosList_ = function(node, objectStack) {
  var s = ol.xml.getAllTextContent(node, false).replace(/^\s*|\s*$/g, '');
  var context = objectStack[0];
  var containerSrs = context['srsName'];
  var containerDimension = node.parentNode.getAttribute('srsDimension');
  var axisOrientation = 'enu';
  if (containerSrs) {
    var proj = ol.proj.get(containerSrs);
    axisOrientation = proj.getAxisOrientation();
  }
  var coords = s.split(/\s+/);
  // The "dimension" attribute is from the GML 3.0.1 spec.
  var dim = 2;
  if (node.getAttribute('srsDimension')) {
    dim = ol.format.XSD.readNonNegativeIntegerString(
        node.getAttribute('srsDimension'));
  } else if (node.getAttribute('dimension')) {
    dim = ol.format.XSD.readNonNegativeIntegerString(
        node.getAttribute('dimension'));
  } else if (containerDimension) {
    dim = ol.format.XSD.readNonNegativeIntegerString(containerDimension);
  }
  var x, y, z;
  var flatCoordinates = [];
  for (var i = 0, ii = coords.length; i < ii; i += dim) {
    x = parseFloat(coords[i]);
    y = parseFloat(coords[i + 1]);
    z = (dim === 3) ? parseFloat(coords[i + 2]) : 0;
    if (axisOrientation.substr(0, 2) === 'en') {
      flatCoordinates.push(x, y, z);
    } else {
      flatCoordinates.push(y, x, z);
    }
  }
  return flatCoordinates;
};


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.GML3.prototype.GEOMETRY_FLAT_COORDINATES_PARSERS_ = {
  'http://www.opengis.net/gml' : {
    'pos': ol.xml.makeReplacer(ol.format.GML3.prototype.readFlatPos_),
    'posList': ol.xml.makeReplacer(ol.format.GML3.prototype.readFlatPosList_)
  }
};


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.GML3.prototype.FLAT_LINEAR_RINGS_PARSERS_ = {
  'http://www.opengis.net/gml' : {
    'interior': ol.format.GML3.prototype.interiorParser_,
    'exterior': ol.format.GML3.prototype.exteriorParser_
  }
};


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.GML3.prototype.GEOMETRY_PARSERS_ = {
  'http://www.opengis.net/gml' : {
    'Point': ol.xml.makeReplacer(ol.format.GMLBase.prototype.readPoint),
    'MultiPoint': ol.xml.makeReplacer(
        ol.format.GMLBase.prototype.readMultiPoint),
    'LineString': ol.xml.makeReplacer(
        ol.format.GMLBase.prototype.readLineString),
    'MultiLineString': ol.xml.makeReplacer(
        ol.format.GMLBase.prototype.readMultiLineString),
    'LinearRing' : ol.xml.makeReplacer(
        ol.format.GMLBase.prototype.readLinearRing),
    'Polygon': ol.xml.makeReplacer(ol.format.GMLBase.prototype.readPolygon),
    'MultiPolygon': ol.xml.makeReplacer(
        ol.format.GMLBase.prototype.readMultiPolygon),
    'Surface': ol.xml.makeReplacer(ol.format.GML3.prototype.readSurface_),
    'MultiSurface': ol.xml.makeReplacer(
        ol.format.GML3.prototype.readMultiSurface_),
    'Curve': ol.xml.makeReplacer(ol.format.GML3.prototype.readCurve_),
    'MultiCurve': ol.xml.makeReplacer(
        ol.format.GML3.prototype.readMultiCurve_),
    'Envelope': ol.xml.makeReplacer(ol.format.GML3.prototype.readEnvelope_)
  }
};


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.GML3.prototype.MULTICURVE_PARSERS_ = {
  'http://www.opengis.net/gml' : {
    'curveMember': ol.xml.makeArrayPusher(
        ol.format.GML3.prototype.curveMemberParser_),
    'curveMembers': ol.xml.makeArrayPusher(
        ol.format.GML3.prototype.curveMemberParser_)
  }
};


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.GML3.prototype.MULTISURFACE_PARSERS_ = {
  'http://www.opengis.net/gml' : {
    'surfaceMember': ol.xml.makeArrayPusher(
        ol.format.GML3.prototype.surfaceMemberParser_),
    'surfaceMembers': ol.xml.makeArrayPusher(
        ol.format.GML3.prototype.surfaceMemberParser_)
  }
};


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.GML3.prototype.CURVEMEMBER_PARSERS_ = {
  'http://www.opengis.net/gml' : {
    'LineString': ol.xml.makeArrayPusher(
        ol.format.GMLBase.prototype.readLineString),
    'Curve': ol.xml.makeArrayPusher(ol.format.GML3.prototype.readCurve_)
  }
};


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.GML3.prototype.SURFACEMEMBER_PARSERS_ = {
  'http://www.opengis.net/gml' : {
    'Polygon': ol.xml.makeArrayPusher(ol.format.GMLBase.prototype.readPolygon),
    'Surface': ol.xml.makeArrayPusher(ol.format.GML3.prototype.readSurface_)
  }
};


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.GML3.prototype.SURFACE_PARSERS_ = {
  'http://www.opengis.net/gml' : {
    'patches': ol.xml.makeReplacer(ol.format.GML3.prototype.readPatch_)
  }
};


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.GML3.prototype.CURVE_PARSERS_ = {
  'http://www.opengis.net/gml' : {
    'segments': ol.xml.makeReplacer(ol.format.GML3.prototype.readSegment_)
  }
};


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.GML3.prototype.ENVELOPE_PARSERS_ = {
  'http://www.opengis.net/gml' : {
    'lowerCorner': ol.xml.makeArrayPusher(
        ol.format.GML3.prototype.readFlatPosList_),
    'upperCorner': ol.xml.makeArrayPusher(
        ol.format.GML3.prototype.readFlatPosList_)
  }
};


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.GML3.prototype.PATCHES_PARSERS_ = {
  'http://www.opengis.net/gml' : {
    'PolygonPatch': ol.xml.makeReplacer(
        ol.format.GML3.prototype.readPolygonPatch_)
  }
};


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.GML3.prototype.SEGMENTS_PARSERS_ = {
  'http://www.opengis.net/gml' : {
    'LineStringSegment': ol.xml.makeReplacer(
        ol.format.GML3.prototype.readLineStringSegment_)
  }
};


/**
 * @param {Node} node Node.
 * @param {ol.geom.Point} value Point geometry.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.GML3.prototype.writePos_ = function(node, value, objectStack) {
  var context = objectStack[objectStack.length - 1];
  var srsName = context['srsName'];
  var axisOrientation = 'enu';
  if (srsName) {
    axisOrientation = ol.proj.get(srsName).getAxisOrientation();
  }
  var point = value.getCoordinates();
  var coords;
  // only 2d for simple features profile
  if (axisOrientation.substr(0, 2) === 'en') {
    coords = (point[0] + ' ' + point[1]);
  } else {
    coords = (point[1] + ' ' + point[0]);
  }
  ol.format.XSD.writeStringTextNode(node, coords);
};


/**
 * @param {Array.<number>} point Point geometry.
 * @param {string=} opt_srsName Optional srsName
 * @return {string} The coords string.
 * @private
 */
ol.format.GML3.prototype.getCoords_ = function(point, opt_srsName) {
  var axisOrientation = 'enu';
  if (opt_srsName) {
    axisOrientation = ol.proj.get(opt_srsName).getAxisOrientation();
  }
  return ((axisOrientation.substr(0, 2) === 'en') ?
      point[0] + ' ' + point[1] :
      point[1] + ' ' + point[0]);
};


/**
 * @param {Node} node Node.
 * @param {ol.geom.LineString|ol.geom.LinearRing} value Geometry.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.GML3.prototype.writePosList_ = function(node, value, objectStack) {
  var context = objectStack[objectStack.length - 1];
  var srsName = context['srsName'];
  // only 2d for simple features profile
  var points = value.getCoordinates();
  var len = points.length;
  var parts = new Array(len);
  var point;
  for (var i = 0; i < len; ++i) {
    point = points[i];
    parts[i] = this.getCoords_(point, srsName);
  }
  ol.format.XSD.writeStringTextNode(node, parts.join(' '));
};


/**
 * @param {Node} node Node.
 * @param {ol.geom.Point} geometry Point geometry.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.GML3.prototype.writePoint_ = function(node, geometry, objectStack) {
  var context = objectStack[objectStack.length - 1];
  var srsName = context['srsName'];
  if (srsName) {
    node.setAttribute('srsName', srsName);
  }
  var pos = ol.xml.createElementNS(node.namespaceURI, 'pos');
  node.appendChild(pos);
  this.writePos_(pos, geometry, objectStack);
};


/**
 * @type {Object.<string, Object.<string, ol.XmlSerializer>>}
 * @private
 */
ol.format.GML3.ENVELOPE_SERIALIZERS_ = {
  'http://www.opengis.net/gml': {
    'lowerCorner': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
    'upperCorner': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode)
  }
};


/**
 * @param {Node} node Node.
 * @param {ol.Extent} extent Extent.
 * @param {Array.<*>} objectStack Node stack.
 */
ol.format.GML3.prototype.writeEnvelope = function(node, extent, objectStack) {
  goog.DEBUG && console.assert(extent.length == 4, 'extent should have 4 items');
  var context = objectStack[objectStack.length - 1];
  var srsName = context['srsName'];
  if (srsName) {
    node.setAttribute('srsName', srsName);
  }
  var keys = ['lowerCorner', 'upperCorner'];
  var values = [extent[0] + ' ' + extent[1], extent[2] + ' ' + extent[3]];
  ol.xml.pushSerializeAndPop(/** @type {ol.XmlNodeStackItem} */
      ({node: node}), ol.format.GML3.ENVELOPE_SERIALIZERS_,
      ol.xml.OBJECT_PROPERTY_NODE_FACTORY,
      values,
      objectStack, keys, this);
};


/**
 * @param {Node} node Node.
 * @param {ol.geom.LinearRing} geometry LinearRing geometry.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.GML3.prototype.writeLinearRing_ = function(node, geometry, objectStack) {
  var context = objectStack[objectStack.length - 1];
  var srsName = context['srsName'];
  if (srsName) {
    node.setAttribute('srsName', srsName);
  }
  var posList = ol.xml.createElementNS(node.namespaceURI, 'posList');
  node.appendChild(posList);
  this.writePosList_(posList, geometry, objectStack);
};


/**
 * @param {*} value Value.
 * @param {Array.<*>} objectStack Object stack.
 * @param {string=} opt_nodeName Node name.
 * @return {Node} Node.
 * @private
 */
ol.format.GML3.prototype.RING_NODE_FACTORY_ = function(value, objectStack, opt_nodeName) {
  var context = objectStack[objectStack.length - 1];
  var parentNode = context.node;
  var exteriorWritten = context['exteriorWritten'];
  if (exteriorWritten === undefined) {
    context['exteriorWritten'] = true;
  }
  return ol.xml.createElementNS(parentNode.namespaceURI,
      exteriorWritten !== undefined ? 'interior' : 'exterior');
};


/**
 * @param {Node} node Node.
 * @param {ol.geom.Polygon} geometry Polygon geometry.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.GML3.prototype.writeSurfaceOrPolygon_ = function(node, geometry, objectStack) {
  var context = objectStack[objectStack.length - 1];
  var srsName = context['srsName'];
  if (node.nodeName !== 'PolygonPatch' && srsName) {
    node.setAttribute('srsName', srsName);
  }
  if (node.nodeName === 'Polygon' || node.nodeName === 'PolygonPatch') {
    var rings = geometry.getLinearRings();
    ol.xml.pushSerializeAndPop(
        {node: node, srsName: srsName},
        ol.format.GML3.RING_SERIALIZERS_,
        this.RING_NODE_FACTORY_,
        rings, objectStack, undefined, this);
  } else if (node.nodeName === 'Surface') {
    var patches = ol.xml.createElementNS(node.namespaceURI, 'patches');
    node.appendChild(patches);
    this.writeSurfacePatches_(
        patches, geometry, objectStack);
  }
};


/**
 * @param {Node} node Node.
 * @param {ol.geom.LineString} geometry LineString geometry.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.GML3.prototype.writeCurveOrLineString_ = function(node, geometry, objectStack) {
  var context = objectStack[objectStack.length - 1];
  var srsName = context['srsName'];
  if (node.nodeName !== 'LineStringSegment' && srsName) {
    node.setAttribute('srsName', srsName);
  }
  if (node.nodeName === 'LineString' ||
      node.nodeName === 'LineStringSegment') {
    var posList = ol.xml.createElementNS(node.namespaceURI, 'posList');
    node.appendChild(posList);
    this.writePosList_(posList, geometry, objectStack);
  } else if (node.nodeName === 'Curve') {
    var segments = ol.xml.createElementNS(node.namespaceURI, 'segments');
    node.appendChild(segments);
    this.writeCurveSegments_(segments,
        geometry, objectStack);
  }
};


/**
 * @param {Node} node Node.
 * @param {ol.geom.MultiPolygon} geometry MultiPolygon geometry.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.GML3.prototype.writeMultiSurfaceOrPolygon_ = function(node, geometry, objectStack) {
  var context = objectStack[objectStack.length - 1];
  var srsName = context['srsName'];
  var surface = context['surface'];
  if (srsName) {
    node.setAttribute('srsName', srsName);
  }
  var polygons = geometry.getPolygons();
  ol.xml.pushSerializeAndPop({node: node, srsName: srsName, surface: surface},
      ol.format.GML3.SURFACEORPOLYGONMEMBER_SERIALIZERS_,
      this.MULTIGEOMETRY_MEMBER_NODE_FACTORY_, polygons,
      objectStack, undefined, this);
};


/**
 * @param {Node} node Node.
 * @param {ol.geom.MultiPoint} geometry MultiPoint geometry.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.GML3.prototype.writeMultiPoint_ = function(node, geometry,
    objectStack) {
  var context = objectStack[objectStack.length - 1];
  var srsName = context['srsName'];
  if (srsName) {
    node.setAttribute('srsName', srsName);
  }
  var points = geometry.getPoints();
  ol.xml.pushSerializeAndPop({node: node, srsName: srsName},
      ol.format.GML3.POINTMEMBER_SERIALIZERS_,
      ol.xml.makeSimpleNodeFactory('pointMember'), points,
      objectStack, undefined, this);
};


/**
 * @param {Node} node Node.
 * @param {ol.geom.MultiLineString} geometry MultiLineString geometry.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.GML3.prototype.writeMultiCurveOrLineString_ = function(node, geometry, objectStack) {
  var context = objectStack[objectStack.length - 1];
  var srsName = context['srsName'];
  var curve = context['curve'];
  if (srsName) {
    node.setAttribute('srsName', srsName);
  }
  var lines = geometry.getLineStrings();
  ol.xml.pushSerializeAndPop({node: node, srsName: srsName, curve: curve},
      ol.format.GML3.LINESTRINGORCURVEMEMBER_SERIALIZERS_,
      this.MULTIGEOMETRY_MEMBER_NODE_FACTORY_, lines,
      objectStack, undefined, this);
};


/**
 * @param {Node} node Node.
 * @param {ol.geom.LinearRing} ring LinearRing geometry.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.GML3.prototype.writeRing_ = function(node, ring, objectStack) {
  var linearRing = ol.xml.createElementNS(node.namespaceURI, 'LinearRing');
  node.appendChild(linearRing);
  this.writeLinearRing_(linearRing, ring, objectStack);
};


/**
 * @param {Node} node Node.
 * @param {ol.geom.Polygon} polygon Polygon geometry.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.GML3.prototype.writeSurfaceOrPolygonMember_ = function(node, polygon, objectStack) {
  var child = this.GEOMETRY_NODE_FACTORY_(
      polygon, objectStack);
  if (child) {
    node.appendChild(child);
    this.writeSurfaceOrPolygon_(child, polygon, objectStack);
  }
};


/**
 * @param {Node} node Node.
 * @param {ol.geom.Point} point Point geometry.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.GML3.prototype.writePointMember_ = function(node, point, objectStack) {
  var child = ol.xml.createElementNS(node.namespaceURI, 'Point');
  node.appendChild(child);
  this.writePoint_(child, point, objectStack);
};


/**
 * @param {Node} node Node.
 * @param {ol.geom.LineString} line LineString geometry.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.GML3.prototype.writeLineStringOrCurveMember_ = function(node, line, objectStack) {
  var child = this.GEOMETRY_NODE_FACTORY_(line, objectStack);
  if (child) {
    node.appendChild(child);
    this.writeCurveOrLineString_(child, line, objectStack);
  }
};


/**
 * @param {Node} node Node.
 * @param {ol.geom.Polygon} polygon Polygon geometry.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.GML3.prototype.writeSurfacePatches_ = function(node, polygon, objectStack) {
  var child = ol.xml.createElementNS(node.namespaceURI, 'PolygonPatch');
  node.appendChild(child);
  this.writeSurfaceOrPolygon_(child, polygon, objectStack);
};


/**
 * @param {Node} node Node.
 * @param {ol.geom.LineString} line LineString geometry.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.GML3.prototype.writeCurveSegments_ = function(node, line, objectStack) {
  var child = ol.xml.createElementNS(node.namespaceURI,
      'LineStringSegment');
  node.appendChild(child);
  this.writeCurveOrLineString_(child, line, objectStack);
};


/**
 * @param {Node} node Node.
 * @param {ol.geom.Geometry|ol.Extent} geometry Geometry.
 * @param {Array.<*>} objectStack Node stack.
 */
ol.format.GML3.prototype.writeGeometryElement = function(node, geometry, objectStack) {
  var context = /** @type {olx.format.WriteOptions} */ (objectStack[objectStack.length - 1]);
  var item = ol.obj.assign({}, context);
  item.node = node;
  var value;
  if (Array.isArray(geometry)) {
    if (context.dataProjection) {
      value = ol.proj.transformExtent(
          geometry, context.featureProjection, context.dataProjection);
    } else {
      value = geometry;
    }
  } else {
    value =
        ol.format.Feature.transformWithOptions(/** @type {ol.geom.Geometry} */ (geometry), true, context);
  }
  ol.xml.pushSerializeAndPop(/** @type {ol.XmlNodeStackItem} */
      (item), ol.format.GML3.GEOMETRY_SERIALIZERS_,
      this.GEOMETRY_NODE_FACTORY_, [value],
      objectStack, undefined, this);
};


/**
 * @param {Node} node Node.
 * @param {ol.Feature} feature Feature.
 * @param {Array.<*>} objectStack Node stack.
 */
ol.format.GML3.prototype.writeFeatureElement = function(node, feature, objectStack) {
  var fid = feature.getId();
  if (fid) {
    node.setAttribute('fid', fid);
  }
  var context = /** @type {Object} */ (objectStack[objectStack.length - 1]);
  var featureNS = context['featureNS'];
  var geometryName = feature.getGeometryName();
  if (!context.serializers) {
    context.serializers = {};
    context.serializers[featureNS] = {};
  }
  var properties = feature.getProperties();
  var keys = [], values = [];
  for (var key in properties) {
    var value = properties[key];
    if (value !== null) {
      keys.push(key);
      values.push(value);
      if (key == geometryName || value instanceof ol.geom.Geometry) {
        if (!(key in context.serializers[featureNS])) {
          context.serializers[featureNS][key] = ol.xml.makeChildAppender(
              this.writeGeometryElement, this);
        }
      } else {
        if (!(key in context.serializers[featureNS])) {
          context.serializers[featureNS][key] = ol.xml.makeChildAppender(
              ol.format.XSD.writeStringTextNode);
        }
      }
    }
  }
  var item = ol.obj.assign({}, context);
  item.node = node;
  ol.xml.pushSerializeAndPop(/** @type {ol.XmlNodeStackItem} */
      (item), context.serializers,
      ol.xml.makeSimpleNodeFactory(undefined, featureNS),
      values,
      objectStack, keys);
};


/**
 * @param {Node} node Node.
 * @param {Array.<ol.Feature>} features Features.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.GML3.prototype.writeFeatureMembers_ = function(node, features, objectStack) {
  var context = /** @type {Object} */ (objectStack[objectStack.length - 1]);
  var featureType = context['featureType'];
  var featureNS = context['featureNS'];
  var serializers = {};
  serializers[featureNS] = {};
  serializers[featureNS][featureType] = ol.xml.makeChildAppender(
      this.writeFeatureElement, this);
  var item = ol.obj.assign({}, context);
  item.node = node;
  ol.xml.pushSerializeAndPop(/** @type {ol.XmlNodeStackItem} */
      (item),
      serializers,
      ol.xml.makeSimpleNodeFactory(featureType, featureNS), features,
      objectStack);
};


/**
 * @type {Object.<string, Object.<string, ol.XmlSerializer>>}
 * @private
 */
ol.format.GML3.SURFACEORPOLYGONMEMBER_SERIALIZERS_ = {
  'http://www.opengis.net/gml': {
    'surfaceMember': ol.xml.makeChildAppender(
        ol.format.GML3.prototype.writeSurfaceOrPolygonMember_),
    'polygonMember': ol.xml.makeChildAppender(
        ol.format.GML3.prototype.writeSurfaceOrPolygonMember_)
  }
};


/**
 * @type {Object.<string, Object.<string, ol.XmlSerializer>>}
 * @private
 */
ol.format.GML3.POINTMEMBER_SERIALIZERS_ = {
  'http://www.opengis.net/gml': {
    'pointMember': ol.xml.makeChildAppender(
        ol.format.GML3.prototype.writePointMember_)
  }
};


/**
 * @type {Object.<string, Object.<string, ol.XmlSerializer>>}
 * @private
 */
ol.format.GML3.LINESTRINGORCURVEMEMBER_SERIALIZERS_ = {
  'http://www.opengis.net/gml': {
    'lineStringMember': ol.xml.makeChildAppender(
        ol.format.GML3.prototype.writeLineStringOrCurveMember_),
    'curveMember': ol.xml.makeChildAppender(
        ol.format.GML3.prototype.writeLineStringOrCurveMember_)
  }
};


/**
 * @type {Object.<string, Object.<string, ol.XmlSerializer>>}
 * @private
 */
ol.format.GML3.RING_SERIALIZERS_ = {
  'http://www.opengis.net/gml': {
    'exterior': ol.xml.makeChildAppender(ol.format.GML3.prototype.writeRing_),
    'interior': ol.xml.makeChildAppender(ol.format.GML3.prototype.writeRing_)
  }
};


/**
 * @type {Object.<string, Object.<string, ol.XmlSerializer>>}
 * @private
 */
ol.format.GML3.GEOMETRY_SERIALIZERS_ = {
  'http://www.opengis.net/gml': {
    'Curve': ol.xml.makeChildAppender(
        ol.format.GML3.prototype.writeCurveOrLineString_),
    'MultiCurve': ol.xml.makeChildAppender(
        ol.format.GML3.prototype.writeMultiCurveOrLineString_),
    'Point': ol.xml.makeChildAppender(ol.format.GML3.prototype.writePoint_),
    'MultiPoint': ol.xml.makeChildAppender(
        ol.format.GML3.prototype.writeMultiPoint_),
    'LineString': ol.xml.makeChildAppender(
        ol.format.GML3.prototype.writeCurveOrLineString_),
    'MultiLineString': ol.xml.makeChildAppender(
        ol.format.GML3.prototype.writeMultiCurveOrLineString_),
    'LinearRing': ol.xml.makeChildAppender(
        ol.format.GML3.prototype.writeLinearRing_),
    'Polygon': ol.xml.makeChildAppender(
        ol.format.GML3.prototype.writeSurfaceOrPolygon_),
    'MultiPolygon': ol.xml.makeChildAppender(
        ol.format.GML3.prototype.writeMultiSurfaceOrPolygon_),
    'Surface': ol.xml.makeChildAppender(
        ol.format.GML3.prototype.writeSurfaceOrPolygon_),
    'MultiSurface': ol.xml.makeChildAppender(
        ol.format.GML3.prototype.writeMultiSurfaceOrPolygon_),
    'Envelope': ol.xml.makeChildAppender(
        ol.format.GML3.prototype.writeEnvelope)
  }
};


/**
 * @const
 * @type {Object.<string, string>}
 * @private
 */
ol.format.GML3.MULTIGEOMETRY_TO_MEMBER_NODENAME_ = {
  'MultiLineString': 'lineStringMember',
  'MultiCurve': 'curveMember',
  'MultiPolygon': 'polygonMember',
  'MultiSurface': 'surfaceMember'
};


/**
 * @const
 * @param {*} value Value.
 * @param {Array.<*>} objectStack Object stack.
 * @param {string=} opt_nodeName Node name.
 * @return {Node|undefined} Node.
 * @private
 */
ol.format.GML3.prototype.MULTIGEOMETRY_MEMBER_NODE_FACTORY_ = function(value, objectStack, opt_nodeName) {
  var parentNode = objectStack[objectStack.length - 1].node;
  goog.DEBUG && console.assert(ol.xml.isNode(parentNode),
      'parentNode should be a node');
  return ol.xml.createElementNS('http://www.opengis.net/gml',
      ol.format.GML3.MULTIGEOMETRY_TO_MEMBER_NODENAME_[parentNode.nodeName]);
};


/**
 * @const
 * @param {*} value Value.
 * @param {Array.<*>} objectStack Object stack.
 * @param {string=} opt_nodeName Node name.
 * @return {Node|undefined} Node.
 * @private
 */
ol.format.GML3.prototype.GEOMETRY_NODE_FACTORY_ = function(value, objectStack, opt_nodeName) {
  var context = objectStack[objectStack.length - 1];
  var multiSurface = context['multiSurface'];
  var surface = context['surface'];
  var curve = context['curve'];
  var multiCurve = context['multiCurve'];
  var parentNode = objectStack[objectStack.length - 1].node;
  goog.DEBUG && console.assert(ol.xml.isNode(parentNode),
      'parentNode should be a node');
  var nodeName;
  if (!Array.isArray(value)) {
    nodeName = /** @type {ol.geom.Geometry} */ (value).getType();
    if (nodeName === 'MultiPolygon' && multiSurface === true) {
      nodeName = 'MultiSurface';
    } else if (nodeName === 'Polygon' && surface === true) {
      nodeName = 'Surface';
    } else if (nodeName === 'LineString' && curve === true) {
      nodeName = 'Curve';
    } else if (nodeName === 'MultiLineString' && multiCurve === true) {
      nodeName = 'MultiCurve';
    }
  } else {
    nodeName = 'Envelope';
  }
  return ol.xml.createElementNS('http://www.opengis.net/gml',
      nodeName);
};


/**
 * Encode a geometry in GML 3.1.1 Simple Features.
 *
 * @param {ol.geom.Geometry} geometry Geometry.
 * @param {olx.format.WriteOptions=} opt_options Options.
 * @return {Node} Node.
 * @api
 */
ol.format.GML3.prototype.writeGeometryNode = function(geometry, opt_options) {
  opt_options = this.adaptOptions(opt_options);
  var geom = ol.xml.createElementNS('http://www.opengis.net/gml', 'geom');
  var context = {node: geom, srsName: this.srsName,
    curve: this.curve_, surface: this.surface_,
    multiSurface: this.multiSurface_, multiCurve: this.multiCurve_};
  if (opt_options) {
    ol.obj.assign(context, opt_options);
  }
  this.writeGeometryElement(geom, geometry, [context]);
  return geom;
};


/**
 * Encode an array of features in GML 3.1.1 Simple Features.
 *
 * @function
 * @param {Array.<ol.Feature>} features Features.
 * @param {olx.format.WriteOptions=} opt_options Options.
 * @return {string} Result.
 * @api stable
 */
ol.format.GML3.prototype.writeFeatures;


/**
 * Encode an array of features in the GML 3.1.1 format as an XML node.
 *
 * @param {Array.<ol.Feature>} features Features.
 * @param {olx.format.WriteOptions=} opt_options Options.
 * @return {Node} Node.
 * @api
 */
ol.format.GML3.prototype.writeFeaturesNode = function(features, opt_options) {
  opt_options = this.adaptOptions(opt_options);
  var node = ol.xml.createElementNS('http://www.opengis.net/gml',
      'featureMembers');
  ol.xml.setAttributeNS(node, 'http://www.w3.org/2001/XMLSchema-instance',
      'xsi:schemaLocation', this.schemaLocation);
  var context = {
    srsName: this.srsName,
    curve: this.curve_,
    surface: this.surface_,
    multiSurface: this.multiSurface_,
    multiCurve: this.multiCurve_,
    featureNS: this.featureNS,
    featureType: this.featureType
  };
  if (opt_options) {
    ol.obj.assign(context, opt_options);
  }
  this.writeFeatureMembers_(node, features, [context]);
  return node;
};

goog.provide('ol.format.GML');

goog.require('ol.format.GML3');


/**
 * @classdesc
 * Feature format for reading and writing data in the GML format
 * version 3.1.1.
 * Currently only supports GML 3.1.1 Simple Features profile.
 *
 * @constructor
 * @param {olx.format.GMLOptions=} opt_options
 *     Optional configuration object.
 * @extends {ol.format.GMLBase}
 * @api stable
 */
ol.format.GML = ol.format.GML3;


/**
 * Encode an array of features in GML 3.1.1 Simple Features.
 *
 * @function
 * @param {Array.<ol.Feature>} features Features.
 * @param {olx.format.WriteOptions=} opt_options Options.
 * @return {string} Result.
 * @api stable
 */
ol.format.GML.prototype.writeFeatures;


/**
 * Encode an array of features in the GML 3.1.1 format as an XML node.
 *
 * @function
 * @param {Array.<ol.Feature>} features Features.
 * @param {olx.format.WriteOptions=} opt_options Options.
 * @return {Node} Node.
 * @api
 */
ol.format.GML.prototype.writeFeaturesNode;

goog.provide('ol.format.GML2');

goog.require('ol');
goog.require('ol.extent');
goog.require('ol.format.GMLBase');
goog.require('ol.format.XSD');
goog.require('ol.proj');
goog.require('ol.xml');


/**
 * @classdesc
 * Feature format for reading and writing data in the GML format,
 * version 2.1.2.
 *
 * @constructor
 * @param {olx.format.GMLOptions=} opt_options Optional configuration object.
 * @extends {ol.format.GMLBase}
 * @api
 */
ol.format.GML2 = function(opt_options) {
  var options = /** @type {olx.format.GMLOptions} */
      (opt_options ? opt_options : {});

  ol.format.GMLBase.call(this, options);

  this.FEATURE_COLLECTION_PARSERS[ol.format.GMLBase.GMLNS][
      'featureMember'] =
      ol.xml.makeArrayPusher(ol.format.GMLBase.prototype.readFeaturesInternal);

  /**
   * @inheritDoc
   */
  this.schemaLocation = options.schemaLocation ?
      options.schemaLocation : ol.format.GML2.schemaLocation_;

};
ol.inherits(ol.format.GML2, ol.format.GMLBase);


/**
 * @const
 * @type {string}
 * @private
 */
ol.format.GML2.schemaLocation_ = ol.format.GMLBase.GMLNS +
    ' http://schemas.opengis.net/gml/2.1.2/feature.xsd';


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Array.<number>|undefined} Flat coordinates.
 */
ol.format.GML2.prototype.readFlatCoordinates_ = function(node, objectStack) {
  var s = ol.xml.getAllTextContent(node, false).replace(/^\s*|\s*$/g, '');
  var context = /** @type {ol.XmlNodeStackItem} */ (objectStack[0]);
  var containerSrs = context['srsName'];
  var containerDimension = node.parentNode.getAttribute('srsDimension');
  var axisOrientation = 'enu';
  if (containerSrs) {
    var proj = ol.proj.get(containerSrs);
    if (proj) {
      axisOrientation = proj.getAxisOrientation();
    }
  }
  var coords = s.split(/[\s,]+/);
  // The "dimension" attribute is from the GML 3.0.1 spec.
  var dim = 2;
  if (node.getAttribute('srsDimension')) {
    dim = ol.format.XSD.readNonNegativeIntegerString(
        node.getAttribute('srsDimension'));
  } else if (node.getAttribute('dimension')) {
    dim = ol.format.XSD.readNonNegativeIntegerString(
        node.getAttribute('dimension'));
  } else if (containerDimension) {
    dim = ol.format.XSD.readNonNegativeIntegerString(containerDimension);
  }
  var x, y, z;
  var flatCoordinates = [];
  for (var i = 0, ii = coords.length; i < ii; i += dim) {
    x = parseFloat(coords[i]);
    y = parseFloat(coords[i + 1]);
    z = (dim === 3) ? parseFloat(coords[i + 2]) : 0;
    if (axisOrientation.substr(0, 2) === 'en') {
      flatCoordinates.push(x, y, z);
    } else {
      flatCoordinates.push(y, x, z);
    }
  }
  return flatCoordinates;
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {ol.Extent|undefined} Envelope.
 */
ol.format.GML2.prototype.readBox_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Box', 'localName should be Box');
  /** @type {Array.<number>} */
  var flatCoordinates = ol.xml.pushParseAndPop([null],
      this.BOX_PARSERS_, node, objectStack, this);
  return ol.extent.createOrUpdate(flatCoordinates[1][0],
      flatCoordinates[1][1], flatCoordinates[1][3],
      flatCoordinates[1][4]);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.GML2.prototype.innerBoundaryIsParser_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'innerBoundaryIs',
      'localName should be innerBoundaryIs');
  /** @type {Array.<number>|undefined} */
  var flatLinearRing = ol.xml.pushParseAndPop(undefined,
      this.RING_PARSERS, node, objectStack, this);
  if (flatLinearRing) {
    var flatLinearRings = /** @type {Array.<Array.<number>>} */
        (objectStack[objectStack.length - 1]);
    goog.DEBUG && console.assert(Array.isArray(flatLinearRings),
        'flatLinearRings should be an array');
    goog.DEBUG && console.assert(flatLinearRings.length > 0,
        'flatLinearRings should have an array length larger than 0');
    flatLinearRings.push(flatLinearRing);
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.GML2.prototype.outerBoundaryIsParser_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'outerBoundaryIs',
      'localName should be outerBoundaryIs');
  /** @type {Array.<number>|undefined} */
  var flatLinearRing = ol.xml.pushParseAndPop(undefined,
      this.RING_PARSERS, node, objectStack, this);
  if (flatLinearRing) {
    var flatLinearRings = /** @type {Array.<Array.<number>>} */
        (objectStack[objectStack.length - 1]);
    goog.DEBUG && console.assert(Array.isArray(flatLinearRings),
        'flatLinearRings should be an array');
    goog.DEBUG && console.assert(flatLinearRings.length > 0,
        'flatLinearRings should have an array length larger than 0');
    flatLinearRings[0] = flatLinearRing;
  }
};


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.GML2.prototype.GEOMETRY_FLAT_COORDINATES_PARSERS_ = {
  'http://www.opengis.net/gml' : {
    'coordinates': ol.xml.makeReplacer(
        ol.format.GML2.prototype.readFlatCoordinates_)
  }
};


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.GML2.prototype.FLAT_LINEAR_RINGS_PARSERS_ = {
  'http://www.opengis.net/gml' : {
    'innerBoundaryIs': ol.format.GML2.prototype.innerBoundaryIsParser_,
    'outerBoundaryIs': ol.format.GML2.prototype.outerBoundaryIsParser_
  }
};


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.GML2.prototype.BOX_PARSERS_ = {
  'http://www.opengis.net/gml' : {
    'coordinates': ol.xml.makeArrayPusher(
        ol.format.GML2.prototype.readFlatCoordinates_)
  }
};


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.GML2.prototype.GEOMETRY_PARSERS_ = {
  'http://www.opengis.net/gml' : {
    'Point': ol.xml.makeReplacer(ol.format.GMLBase.prototype.readPoint),
    'MultiPoint': ol.xml.makeReplacer(
        ol.format.GMLBase.prototype.readMultiPoint),
    'LineString': ol.xml.makeReplacer(
        ol.format.GMLBase.prototype.readLineString),
    'MultiLineString': ol.xml.makeReplacer(
        ol.format.GMLBase.prototype.readMultiLineString),
    'LinearRing' : ol.xml.makeReplacer(
        ol.format.GMLBase.prototype.readLinearRing),
    'Polygon': ol.xml.makeReplacer(ol.format.GMLBase.prototype.readPolygon),
    'MultiPolygon': ol.xml.makeReplacer(
        ol.format.GMLBase.prototype.readMultiPolygon),
    'Box': ol.xml.makeReplacer(ol.format.GML2.prototype.readBox_)
  }
};

goog.provide('ol.format.GPX');

goog.require('ol');
goog.require('ol.Feature');
goog.require('ol.array');
goog.require('ol.format.Feature');
goog.require('ol.format.XMLFeature');
goog.require('ol.format.XSD');
goog.require('ol.geom.GeometryLayout');
goog.require('ol.geom.LineString');
goog.require('ol.geom.MultiLineString');
goog.require('ol.geom.Point');
goog.require('ol.proj');
goog.require('ol.xml');


/**
 * @classdesc
 * Feature format for reading and writing data in the GPX format.
 *
 * @constructor
 * @extends {ol.format.XMLFeature}
 * @param {olx.format.GPXOptions=} opt_options Options.
 * @api stable
 */
ol.format.GPX = function(opt_options) {

  var options = opt_options ? opt_options : {};

  ol.format.XMLFeature.call(this);

  /**
   * @inheritDoc
   */
  this.defaultDataProjection = ol.proj.get('EPSG:4326');

  /**
   * @type {function(ol.Feature, Node)|undefined}
   * @private
   */
  this.readExtensions_ = options.readExtensions;
};
ol.inherits(ol.format.GPX, ol.format.XMLFeature);


/**
 * @const
 * @private
 * @type {Array.<string>}
 */
ol.format.GPX.NAMESPACE_URIS_ = [
  null,
  'http://www.topografix.com/GPX/1/0',
  'http://www.topografix.com/GPX/1/1'
];


/**
 * @const
 * @type {string}
 * @private
 */
ol.format.GPX.SCHEMA_LOCATION_ = 'http://www.topografix.com/GPX/1/1 ' +
    'http://www.topografix.com/GPX/1/1/gpx.xsd';


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {Node} node Node.
 * @param {Object} values Values.
 * @private
 * @return {Array.<number>} Flat coordinates.
 */
ol.format.GPX.appendCoordinate_ = function(flatCoordinates, node, values) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  flatCoordinates.push(
      parseFloat(node.getAttribute('lon')),
      parseFloat(node.getAttribute('lat')));
  if ('ele' in values) {
    flatCoordinates.push(/** @type {number} */ (values['ele']));
    delete values['ele'];
  } else {
    flatCoordinates.push(0);
  }
  if ('time' in values) {
    flatCoordinates.push(/** @type {number} */ (values['time']));
    delete values['time'];
  } else {
    flatCoordinates.push(0);
  }
  return flatCoordinates;
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.GPX.parseLink_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'link', 'localName should be link');
  var values = /** @type {Object} */ (objectStack[objectStack.length - 1]);
  var href = node.getAttribute('href');
  if (href !== null) {
    values['link'] = href;
  }
  ol.xml.parseNode(ol.format.GPX.LINK_PARSERS_, node, objectStack);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.GPX.parseExtensions_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'extensions',
      'localName should be extensions');
  var values = /** @type {Object} */ (objectStack[objectStack.length - 1]);
  values['extensionsNode_'] = node;
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.GPX.parseRtePt_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'rtept', 'localName should be rtept');
  var values = ol.xml.pushParseAndPop(
      {}, ol.format.GPX.RTEPT_PARSERS_, node, objectStack);
  if (values) {
    var rteValues = /** @type {Object} */ (objectStack[objectStack.length - 1]);
    var flatCoordinates = /** @type {Array.<number>} */
        (rteValues['flatCoordinates']);
    ol.format.GPX.appendCoordinate_(flatCoordinates, node, values);
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.GPX.parseTrkPt_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'trkpt', 'localName should be trkpt');
  var values = ol.xml.pushParseAndPop(
      {}, ol.format.GPX.TRKPT_PARSERS_, node, objectStack);
  if (values) {
    var trkValues = /** @type {Object} */ (objectStack[objectStack.length - 1]);
    var flatCoordinates = /** @type {Array.<number>} */
        (trkValues['flatCoordinates']);
    ol.format.GPX.appendCoordinate_(flatCoordinates, node, values);
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.GPX.parseTrkSeg_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'trkseg',
      'localName should be trkseg');
  var values = /** @type {Object} */ (objectStack[objectStack.length - 1]);
  ol.xml.parseNode(ol.format.GPX.TRKSEG_PARSERS_, node, objectStack);
  var flatCoordinates = /** @type {Array.<number>} */
      (values['flatCoordinates']);
  var ends = /** @type {Array.<number>} */ (values['ends']);
  ends.push(flatCoordinates.length);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {ol.Feature|undefined} Track.
 */
ol.format.GPX.readRte_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'rte', 'localName should be rte');
  var options = /** @type {olx.format.ReadOptions} */ (objectStack[0]);
  var values = ol.xml.pushParseAndPop({
    'flatCoordinates': []
  }, ol.format.GPX.RTE_PARSERS_, node, objectStack);
  if (!values) {
    return undefined;
  }
  var flatCoordinates = /** @type {Array.<number>} */
      (values['flatCoordinates']);
  delete values['flatCoordinates'];
  var geometry = new ol.geom.LineString(null);
  geometry.setFlatCoordinates(ol.geom.GeometryLayout.XYZM, flatCoordinates);
  ol.format.Feature.transformWithOptions(geometry, false, options);
  var feature = new ol.Feature(geometry);
  feature.setProperties(values);
  return feature;
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {ol.Feature|undefined} Track.
 */
ol.format.GPX.readTrk_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'trk', 'localName should be trk');
  var options = /** @type {olx.format.ReadOptions} */ (objectStack[0]);
  var values = ol.xml.pushParseAndPop({
    'flatCoordinates': [],
    'ends': []
  }, ol.format.GPX.TRK_PARSERS_, node, objectStack);
  if (!values) {
    return undefined;
  }
  var flatCoordinates = /** @type {Array.<number>} */
      (values['flatCoordinates']);
  delete values['flatCoordinates'];
  var ends = /** @type {Array.<number>} */ (values['ends']);
  delete values['ends'];
  var geometry = new ol.geom.MultiLineString(null);
  geometry.setFlatCoordinates(
      ol.geom.GeometryLayout.XYZM, flatCoordinates, ends);
  ol.format.Feature.transformWithOptions(geometry, false, options);
  var feature = new ol.Feature(geometry);
  feature.setProperties(values);
  return feature;
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {ol.Feature|undefined} Waypoint.
 */
ol.format.GPX.readWpt_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'wpt', 'localName should be wpt');
  var options = /** @type {olx.format.ReadOptions} */ (objectStack[0]);
  var values = ol.xml.pushParseAndPop(
      {}, ol.format.GPX.WPT_PARSERS_, node, objectStack);
  if (!values) {
    return undefined;
  }
  var coordinates = ol.format.GPX.appendCoordinate_([], node, values);
  var geometry = new ol.geom.Point(
      coordinates, ol.geom.GeometryLayout.XYZM);
  ol.format.Feature.transformWithOptions(geometry, false, options);
  var feature = new ol.Feature(geometry);
  feature.setProperties(values);
  return feature;
};


/**
 * @const
 * @type {Object.<string, function(Node, Array.<*>): (ol.Feature|undefined)>}
 * @private
 */
ol.format.GPX.FEATURE_READER_ = {
  'rte': ol.format.GPX.readRte_,
  'trk': ol.format.GPX.readTrk_,
  'wpt': ol.format.GPX.readWpt_
};


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.GPX.GPX_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.GPX.NAMESPACE_URIS_, {
      'rte': ol.xml.makeArrayPusher(ol.format.GPX.readRte_),
      'trk': ol.xml.makeArrayPusher(ol.format.GPX.readTrk_),
      'wpt': ol.xml.makeArrayPusher(ol.format.GPX.readWpt_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.GPX.LINK_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.GPX.NAMESPACE_URIS_, {
      'text':
          ol.xml.makeObjectPropertySetter(ol.format.XSD.readString, 'linkText'),
      'type':
          ol.xml.makeObjectPropertySetter(ol.format.XSD.readString, 'linkType')
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.GPX.RTE_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.GPX.NAMESPACE_URIS_, {
      'name': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'cmt': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'desc': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'src': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'link': ol.format.GPX.parseLink_,
      'number':
          ol.xml.makeObjectPropertySetter(ol.format.XSD.readNonNegativeInteger),
      'extensions': ol.format.GPX.parseExtensions_,
      'type': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'rtept': ol.format.GPX.parseRtePt_
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.GPX.RTEPT_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.GPX.NAMESPACE_URIS_, {
      'ele': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDecimal),
      'time': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDateTime)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.GPX.TRK_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.GPX.NAMESPACE_URIS_, {
      'name': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'cmt': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'desc': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'src': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'link': ol.format.GPX.parseLink_,
      'number':
          ol.xml.makeObjectPropertySetter(ol.format.XSD.readNonNegativeInteger),
      'type': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'extensions': ol.format.GPX.parseExtensions_,
      'trkseg': ol.format.GPX.parseTrkSeg_
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.GPX.TRKSEG_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.GPX.NAMESPACE_URIS_, {
      'trkpt': ol.format.GPX.parseTrkPt_
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.GPX.TRKPT_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.GPX.NAMESPACE_URIS_, {
      'ele': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDecimal),
      'time': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDateTime)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.GPX.WPT_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.GPX.NAMESPACE_URIS_, {
      'ele': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDecimal),
      'time': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDateTime),
      'magvar': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDecimal),
      'geoidheight': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDecimal),
      'name': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'cmt': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'desc': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'src': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'link': ol.format.GPX.parseLink_,
      'sym': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'type': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'fix': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'sat': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readNonNegativeInteger),
      'hdop': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDecimal),
      'vdop': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDecimal),
      'pdop': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDecimal),
      'ageofdgpsdata':
          ol.xml.makeObjectPropertySetter(ol.format.XSD.readDecimal),
      'dgpsid':
          ol.xml.makeObjectPropertySetter(ol.format.XSD.readNonNegativeInteger),
      'extensions': ol.format.GPX.parseExtensions_
    });


/**
 * @param {Array.<ol.Feature>} features List of features.
 * @private
 */
ol.format.GPX.prototype.handleReadExtensions_ = function(features) {
  if (!features) {
    features = [];
  }
  for (var i = 0, ii = features.length; i < ii; ++i) {
    var feature = features[i];
    if (this.readExtensions_) {
      var extensionsNode = feature.get('extensionsNode_') || null;
      this.readExtensions_(feature, extensionsNode);
    }
    feature.set('extensionsNode_', undefined);
  }
};


/**
 * Read the first feature from a GPX source.
 * Routes (`<rte>`) are converted into LineString geometries, and tracks (`<trk>`)
 * into MultiLineString. Any properties on route and track waypoints are ignored.
 *
 * @function
 * @param {Document|Node|Object|string} source Source.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @return {ol.Feature} Feature.
 * @api stable
 */
ol.format.GPX.prototype.readFeature;


/**
 * @inheritDoc
 */
ol.format.GPX.prototype.readFeatureFromNode = function(node, opt_options) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  if (!ol.array.includes(ol.format.GPX.NAMESPACE_URIS_, node.namespaceURI)) {
    return null;
  }
  var featureReader = ol.format.GPX.FEATURE_READER_[node.localName];
  if (!featureReader) {
    return null;
  }
  var feature = featureReader(node, [this.getReadOptions(node, opt_options)]);
  if (!feature) {
    return null;
  }
  this.handleReadExtensions_([feature]);
  return feature;
};


/**
 * Read all features from a GPX source.
 * Routes (`<rte>`) are converted into LineString geometries, and tracks (`<trk>`)
 * into MultiLineString. Any properties on route and track waypoints are ignored.
 *
 * @function
 * @param {Document|Node|Object|string} source Source.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @return {Array.<ol.Feature>} Features.
 * @api stable
 */
ol.format.GPX.prototype.readFeatures;


/**
 * @inheritDoc
 */
ol.format.GPX.prototype.readFeaturesFromNode = function(node, opt_options) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  if (!ol.array.includes(ol.format.GPX.NAMESPACE_URIS_, node.namespaceURI)) {
    return [];
  }
  if (node.localName == 'gpx') {
    /** @type {Array.<ol.Feature>} */
    var features = ol.xml.pushParseAndPop([], ol.format.GPX.GPX_PARSERS_,
        node, [this.getReadOptions(node, opt_options)]);
    if (features) {
      this.handleReadExtensions_(features);
      return features;
    } else {
      return [];
    }
  }
  return [];
};


/**
 * Read the projection from a GPX source.
 *
 * @function
 * @param {Document|Node|Object|string} source Source.
 * @return {ol.proj.Projection} Projection.
 * @api stable
 */
ol.format.GPX.prototype.readProjection;


/**
 * @param {Node} node Node.
 * @param {string} value Value for the link's `href` attribute.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.GPX.writeLink_ = function(node, value, objectStack) {
  node.setAttribute('href', value);
  var context = objectStack[objectStack.length - 1];
  var properties = context['properties'];
  var link = [
    properties['linkText'],
    properties['linkType']
  ];
  ol.xml.pushSerializeAndPop(/** @type {ol.XmlNodeStackItem} */ ({node: node}),
      ol.format.GPX.LINK_SERIALIZERS_, ol.xml.OBJECT_PROPERTY_NODE_FACTORY,
      link, objectStack, ol.format.GPX.LINK_SEQUENCE_);
};


/**
 * @param {Node} node Node.
 * @param {ol.Coordinate} coordinate Coordinate.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.GPX.writeWptType_ = function(node, coordinate, objectStack) {
  var context = objectStack[objectStack.length - 1];
  var parentNode = context.node;
  goog.DEBUG && console.assert(ol.xml.isNode(parentNode),
      'parentNode should be an XML node');
  var namespaceURI = parentNode.namespaceURI;
  var properties = context['properties'];
  //FIXME Projection handling
  ol.xml.setAttributeNS(node, null, 'lat', coordinate[1]);
  ol.xml.setAttributeNS(node, null, 'lon', coordinate[0]);
  var geometryLayout = context['geometryLayout'];
  switch (geometryLayout) {
    case ol.geom.GeometryLayout.XYZM:
      if (coordinate[3] !== 0) {
        properties['time'] = coordinate[3];
      }
      // fall through
    case ol.geom.GeometryLayout.XYZ:
      if (coordinate[2] !== 0) {
        properties['ele'] = coordinate[2];
      }
      break;
    case ol.geom.GeometryLayout.XYM:
      if (coordinate[2] !== 0) {
        properties['time'] = coordinate[2];
      }
      break;
    default:
      // pass
  }
  var orderedKeys = (node.nodeName == 'rtept') ?
      ol.format.GPX.RTEPT_TYPE_SEQUENCE_[namespaceURI] :
      ol.format.GPX.WPT_TYPE_SEQUENCE_[namespaceURI];
  var values = ol.xml.makeSequence(properties, orderedKeys);
  ol.xml.pushSerializeAndPop(/** @type {ol.XmlNodeStackItem} */
      ({node: node, 'properties': properties}),
      ol.format.GPX.WPT_TYPE_SERIALIZERS_, ol.xml.OBJECT_PROPERTY_NODE_FACTORY,
      values, objectStack, orderedKeys);
};


/**
 * @param {Node} node Node.
 * @param {ol.Feature} feature Feature.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.GPX.writeRte_ = function(node, feature, objectStack) {
  var options = /** @type {olx.format.WriteOptions} */ (objectStack[0]);
  var properties = feature.getProperties();
  var context = {node: node, 'properties': properties};
  var geometry = feature.getGeometry();
  if (geometry) {
    geometry = /** @type {ol.geom.LineString} */
        (ol.format.Feature.transformWithOptions(geometry, true, options));
    context['geometryLayout'] = geometry.getLayout();
    properties['rtept'] = geometry.getCoordinates();
  }
  var parentNode = objectStack[objectStack.length - 1].node;
  var orderedKeys = ol.format.GPX.RTE_SEQUENCE_[parentNode.namespaceURI];
  var values = ol.xml.makeSequence(properties, orderedKeys);
  ol.xml.pushSerializeAndPop(context,
      ol.format.GPX.RTE_SERIALIZERS_, ol.xml.OBJECT_PROPERTY_NODE_FACTORY,
      values, objectStack, orderedKeys);
};


/**
 * @param {Node} node Node.
 * @param {ol.Feature} feature Feature.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.GPX.writeTrk_ = function(node, feature, objectStack) {
  var options = /** @type {olx.format.WriteOptions} */ (objectStack[0]);
  var properties = feature.getProperties();
  /** @type {ol.XmlNodeStackItem} */
  var context = {node: node, 'properties': properties};
  var geometry = feature.getGeometry();
  if (geometry) {
    geometry = /** @type {ol.geom.MultiLineString} */
        (ol.format.Feature.transformWithOptions(geometry, true, options));
    properties['trkseg'] = geometry.getLineStrings();
  }
  var parentNode = objectStack[objectStack.length - 1].node;
  var orderedKeys = ol.format.GPX.TRK_SEQUENCE_[parentNode.namespaceURI];
  var values = ol.xml.makeSequence(properties, orderedKeys);
  ol.xml.pushSerializeAndPop(context,
      ol.format.GPX.TRK_SERIALIZERS_, ol.xml.OBJECT_PROPERTY_NODE_FACTORY,
      values, objectStack, orderedKeys);
};


/**
 * @param {Node} node Node.
 * @param {ol.geom.LineString} lineString LineString.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.GPX.writeTrkSeg_ = function(node, lineString, objectStack) {
  /** @type {ol.XmlNodeStackItem} */
  var context = {node: node, 'geometryLayout': lineString.getLayout(),
    'properties': {}};
  ol.xml.pushSerializeAndPop(context,
      ol.format.GPX.TRKSEG_SERIALIZERS_, ol.format.GPX.TRKSEG_NODE_FACTORY_,
      lineString.getCoordinates(), objectStack);
};


/**
 * @param {Node} node Node.
 * @param {ol.Feature} feature Feature.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.GPX.writeWpt_ = function(node, feature, objectStack) {
  var options = /** @type {olx.format.WriteOptions} */ (objectStack[0]);
  var context = objectStack[objectStack.length - 1];
  context['properties'] = feature.getProperties();
  var geometry = feature.getGeometry();
  if (geometry) {
    geometry = /** @type {ol.geom.Point} */
        (ol.format.Feature.transformWithOptions(geometry, true, options));
    context['geometryLayout'] = geometry.getLayout();
    ol.format.GPX.writeWptType_(node, geometry.getCoordinates(), objectStack);
  }
};


/**
 * @const
 * @type {Array.<string>}
 * @private
 */
ol.format.GPX.LINK_SEQUENCE_ = ['text', 'type'];


/**
 * @type {Object.<string, Object.<string, ol.XmlSerializer>>}
 * @private
 */
ol.format.GPX.LINK_SERIALIZERS_ = ol.xml.makeStructureNS(
    ol.format.GPX.NAMESPACE_URIS_, {
      'text': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
      'type': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode)
    });


/**
 * @const
 * @type {Object.<string, Array.<string>>}
 * @private
 */
ol.format.GPX.RTE_SEQUENCE_ = ol.xml.makeStructureNS(
    ol.format.GPX.NAMESPACE_URIS_, [
      'name', 'cmt', 'desc', 'src', 'link', 'number', 'type', 'rtept'
    ]);


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlSerializer>>}
 * @private
 */
ol.format.GPX.RTE_SERIALIZERS_ = ol.xml.makeStructureNS(
    ol.format.GPX.NAMESPACE_URIS_, {
      'name': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
      'cmt': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
      'desc': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
      'src': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
      'link': ol.xml.makeChildAppender(ol.format.GPX.writeLink_),
      'number': ol.xml.makeChildAppender(
          ol.format.XSD.writeNonNegativeIntegerTextNode),
      'type': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
      'rtept': ol.xml.makeArraySerializer(ol.xml.makeChildAppender(
          ol.format.GPX.writeWptType_))
    });


/**
 * @const
 * @type {Object.<string, Array.<string>>}
 * @private
 */
ol.format.GPX.RTEPT_TYPE_SEQUENCE_ = ol.xml.makeStructureNS(
    ol.format.GPX.NAMESPACE_URIS_, [
      'ele', 'time'
    ]);


/**
 * @const
 * @type {Object.<string, Array.<string>>}
 * @private
 */
ol.format.GPX.TRK_SEQUENCE_ = ol.xml.makeStructureNS(
    ol.format.GPX.NAMESPACE_URIS_, [
      'name', 'cmt', 'desc', 'src', 'link', 'number', 'type', 'trkseg'
    ]);


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlSerializer>>}
 * @private
 */
ol.format.GPX.TRK_SERIALIZERS_ = ol.xml.makeStructureNS(
    ol.format.GPX.NAMESPACE_URIS_, {
      'name': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
      'cmt': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
      'desc': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
      'src': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
      'link': ol.xml.makeChildAppender(ol.format.GPX.writeLink_),
      'number': ol.xml.makeChildAppender(
          ol.format.XSD.writeNonNegativeIntegerTextNode),
      'type': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
      'trkseg': ol.xml.makeArraySerializer(ol.xml.makeChildAppender(
          ol.format.GPX.writeTrkSeg_))
    });


/**
 * @const
 * @type {function(*, Array.<*>, string=): (Node|undefined)}
 * @private
 */
ol.format.GPX.TRKSEG_NODE_FACTORY_ = ol.xml.makeSimpleNodeFactory('trkpt');


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlSerializer>>}
 * @private
 */
ol.format.GPX.TRKSEG_SERIALIZERS_ = ol.xml.makeStructureNS(
    ol.format.GPX.NAMESPACE_URIS_, {
      'trkpt': ol.xml.makeChildAppender(ol.format.GPX.writeWptType_)
    });


/**
 * @const
 * @type {Object.<string, Array.<string>>}
 * @private
 */
ol.format.GPX.WPT_TYPE_SEQUENCE_ = ol.xml.makeStructureNS(
    ol.format.GPX.NAMESPACE_URIS_, [
      'ele', 'time', 'magvar', 'geoidheight', 'name', 'cmt', 'desc', 'src',
      'link', 'sym', 'type', 'fix', 'sat', 'hdop', 'vdop', 'pdop',
      'ageofdgpsdata', 'dgpsid'
    ]);


/**
 * @type {Object.<string, Object.<string, ol.XmlSerializer>>}
 * @private
 */
ol.format.GPX.WPT_TYPE_SERIALIZERS_ = ol.xml.makeStructureNS(
    ol.format.GPX.NAMESPACE_URIS_, {
      'ele': ol.xml.makeChildAppender(ol.format.XSD.writeDecimalTextNode),
      'time': ol.xml.makeChildAppender(ol.format.XSD.writeDateTimeTextNode),
      'magvar': ol.xml.makeChildAppender(ol.format.XSD.writeDecimalTextNode),
      'geoidheight': ol.xml.makeChildAppender(
          ol.format.XSD.writeDecimalTextNode),
      'name': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
      'cmt': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
      'desc': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
      'src': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
      'link': ol.xml.makeChildAppender(ol.format.GPX.writeLink_),
      'sym': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
      'type': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
      'fix': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
      'sat': ol.xml.makeChildAppender(
          ol.format.XSD.writeNonNegativeIntegerTextNode),
      'hdop': ol.xml.makeChildAppender(ol.format.XSD.writeDecimalTextNode),
      'vdop': ol.xml.makeChildAppender(ol.format.XSD.writeDecimalTextNode),
      'pdop': ol.xml.makeChildAppender(ol.format.XSD.writeDecimalTextNode),
      'ageofdgpsdata': ol.xml.makeChildAppender(
          ol.format.XSD.writeDecimalTextNode),
      'dgpsid': ol.xml.makeChildAppender(
          ol.format.XSD.writeNonNegativeIntegerTextNode)
    });


/**
 * @const
 * @type {Object.<string, string>}
 * @private
 */
ol.format.GPX.GEOMETRY_TYPE_TO_NODENAME_ = {
  'Point': 'wpt',
  'LineString': 'rte',
  'MultiLineString': 'trk'
};


/**
 * @const
 * @param {*} value Value.
 * @param {Array.<*>} objectStack Object stack.
 * @param {string=} opt_nodeName Node name.
 * @return {Node|undefined} Node.
 * @private
 */
ol.format.GPX.GPX_NODE_FACTORY_ = function(value, objectStack, opt_nodeName) {
  var geometry = /** @type {ol.Feature} */ (value).getGeometry();
  if (geometry) {
    var nodeName = ol.format.GPX.GEOMETRY_TYPE_TO_NODENAME_[geometry.getType()];
    if (nodeName) {
      var parentNode = objectStack[objectStack.length - 1].node;
      goog.DEBUG && console.assert(ol.xml.isNode(parentNode),
          'parentNode should be an XML node');
      return ol.xml.createElementNS(parentNode.namespaceURI, nodeName);
    }
  }
};


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlSerializer>>}
 * @private
 */
ol.format.GPX.GPX_SERIALIZERS_ = ol.xml.makeStructureNS(
    ol.format.GPX.NAMESPACE_URIS_, {
      'rte': ol.xml.makeChildAppender(ol.format.GPX.writeRte_),
      'trk': ol.xml.makeChildAppender(ol.format.GPX.writeTrk_),
      'wpt': ol.xml.makeChildAppender(ol.format.GPX.writeWpt_)
    });


/**
 * Encode an array of features in the GPX format.
 * LineString geometries are output as routes (`<rte>`), and MultiLineString
 * as tracks (`<trk>`).
 *
 * @function
 * @param {Array.<ol.Feature>} features Features.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @return {string} Result.
 * @api stable
 */
ol.format.GPX.prototype.writeFeatures;


/**
 * Encode an array of features in the GPX format as an XML node.
 * LineString geometries are output as routes (`<rte>`), and MultiLineString
 * as tracks (`<trk>`).
 *
 * @param {Array.<ol.Feature>} features Features.
 * @param {olx.format.WriteOptions=} opt_options Options.
 * @return {Node} Node.
 * @api
 */
ol.format.GPX.prototype.writeFeaturesNode = function(features, opt_options) {
  opt_options = this.adaptOptions(opt_options);
  //FIXME Serialize metadata
  var gpx = ol.xml.createElementNS('http://www.topografix.com/GPX/1/1', 'gpx');
  var xmlnsUri = 'http://www.w3.org/2000/xmlns/';
  var xmlSchemaInstanceUri = 'http://www.w3.org/2001/XMLSchema-instance';
  ol.xml.setAttributeNS(gpx, xmlnsUri, 'xmlns:xsi', xmlSchemaInstanceUri);
  ol.xml.setAttributeNS(gpx, xmlSchemaInstanceUri, 'xsi:schemaLocation',
      ol.format.GPX.SCHEMA_LOCATION_);
  gpx.setAttribute('version', '1.1');
  gpx.setAttribute('creator', 'OpenLayers 3');

  ol.xml.pushSerializeAndPop(/** @type {ol.XmlNodeStackItem} */
      ({node: gpx}), ol.format.GPX.GPX_SERIALIZERS_,
      ol.format.GPX.GPX_NODE_FACTORY_, features, [opt_options]);
  return gpx;
};

goog.provide('ol.format.TextFeature');

goog.require('ol');
goog.require('ol.format.Feature');
goog.require('ol.format.FormatType');


/**
 * @classdesc
 * Abstract base class; normally only used for creating subclasses and not
 * instantiated in apps.
 * Base class for text feature formats.
 *
 * @constructor
 * @extends {ol.format.Feature}
 */
ol.format.TextFeature = function() {
  ol.format.Feature.call(this);
};
ol.inherits(ol.format.TextFeature, ol.format.Feature);


/**
 * @param {Document|Node|Object|string} source Source.
 * @private
 * @return {string} Text.
 */
ol.format.TextFeature.prototype.getText_ = function(source) {
  if (typeof source === 'string') {
    return source;
  } else {
    return '';
  }
};


/**
 * @inheritDoc
 */
ol.format.TextFeature.prototype.getType = function() {
  return ol.format.FormatType.TEXT;
};


/**
 * @inheritDoc
 */
ol.format.TextFeature.prototype.readFeature = function(source, opt_options) {
  return this.readFeatureFromText(
      this.getText_(source), this.adaptOptions(opt_options));
};


/**
 * @abstract
 * @param {string} text Text.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @protected
 * @return {ol.Feature} Feature.
 */
ol.format.TextFeature.prototype.readFeatureFromText = function(text, opt_options) {};


/**
 * @inheritDoc
 */
ol.format.TextFeature.prototype.readFeatures = function(source, opt_options) {
  return this.readFeaturesFromText(
      this.getText_(source), this.adaptOptions(opt_options));
};


/**
 * @abstract
 * @param {string} text Text.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @protected
 * @return {Array.<ol.Feature>} Features.
 */
ol.format.TextFeature.prototype.readFeaturesFromText = function(text, opt_options) {};


/**
 * @inheritDoc
 */
ol.format.TextFeature.prototype.readGeometry = function(source, opt_options) {
  return this.readGeometryFromText(
      this.getText_(source), this.adaptOptions(opt_options));
};


/**
 * @abstract
 * @param {string} text Text.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @protected
 * @return {ol.geom.Geometry} Geometry.
 */
ol.format.TextFeature.prototype.readGeometryFromText = function(text, opt_options) {};


/**
 * @inheritDoc
 */
ol.format.TextFeature.prototype.readProjection = function(source) {
  return this.readProjectionFromText(this.getText_(source));
};


/**
 * @param {string} text Text.
 * @protected
 * @return {ol.proj.Projection} Projection.
 */
ol.format.TextFeature.prototype.readProjectionFromText = function(text) {
  return this.defaultDataProjection;
};


/**
 * @inheritDoc
 */
ol.format.TextFeature.prototype.writeFeature = function(feature, opt_options) {
  return this.writeFeatureText(feature, this.adaptOptions(opt_options));
};


/**
 * @abstract
 * @param {ol.Feature} feature Features.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @protected
 * @return {string} Text.
 */
ol.format.TextFeature.prototype.writeFeatureText = function(feature, opt_options) {};


/**
 * @inheritDoc
 */
ol.format.TextFeature.prototype.writeFeatures = function(
    features, opt_options) {
  return this.writeFeaturesText(features, this.adaptOptions(opt_options));
};


/**
 * @abstract
 * @param {Array.<ol.Feature>} features Features.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @protected
 * @return {string} Text.
 */
ol.format.TextFeature.prototype.writeFeaturesText = function(features, opt_options) {};


/**
 * @inheritDoc
 */
ol.format.TextFeature.prototype.writeGeometry = function(
    geometry, opt_options) {
  return this.writeGeometryText(geometry, this.adaptOptions(opt_options));
};


/**
 * @abstract
 * @param {ol.geom.Geometry} geometry Geometry.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @protected
 * @return {string} Text.
 */
ol.format.TextFeature.prototype.writeGeometryText = function(geometry, opt_options) {};

goog.provide('ol.format.IGC');
goog.provide('ol.format.IGCZ');

goog.require('ol');
goog.require('ol.Feature');
goog.require('ol.format.Feature');
goog.require('ol.format.TextFeature');
goog.require('ol.geom.GeometryLayout');
goog.require('ol.geom.LineString');
goog.require('ol.proj');


/**
 * IGC altitude/z. One of 'barometric', 'gps', 'none'.
 * @enum {string}
 */
ol.format.IGCZ = {
  BAROMETRIC: 'barometric',
  GPS: 'gps',
  NONE: 'none'
};


/**
 * @classdesc
 * Feature format for `*.igc` flight recording files.
 *
 * @constructor
 * @extends {ol.format.TextFeature}
 * @param {olx.format.IGCOptions=} opt_options Options.
 * @api
 */
ol.format.IGC = function(opt_options) {

  var options = opt_options ? opt_options : {};

  ol.format.TextFeature.call(this);

  /**
   * @inheritDoc
   */
  this.defaultDataProjection = ol.proj.get('EPSG:4326');

  /**
   * @private
   * @type {ol.format.IGCZ}
   */
  this.altitudeMode_ = options.altitudeMode ?
      options.altitudeMode : ol.format.IGCZ.NONE;

};
ol.inherits(ol.format.IGC, ol.format.TextFeature);


/**
 * @const
 * @type {Array.<string>}
 * @private
 */
ol.format.IGC.EXTENSIONS_ = ['.igc'];


/**
 * @const
 * @type {RegExp}
 * @private
 */
ol.format.IGC.B_RECORD_RE_ =
    /^B(\d{2})(\d{2})(\d{2})(\d{2})(\d{5})([NS])(\d{3})(\d{5})([EW])([AV])(\d{5})(\d{5})/;


/**
 * @const
 * @type {RegExp}
 * @private
 */
ol.format.IGC.H_RECORD_RE_ = /^H.([A-Z]{3}).*?:(.*)/;


/**
 * @const
 * @type {RegExp}
 * @private
 */
ol.format.IGC.HFDTE_RECORD_RE_ = /^HFDTE(\d{2})(\d{2})(\d{2})/;


/**
 * A regular expression matching the newline characters `\r\n`, `\r` and `\n`.
 *
 * @const
 * @type {RegExp}
 * @private
 */
ol.format.IGC.NEWLINE_RE_ = /\r\n|\r|\n/;


/**
 * @inheritDoc
 */
ol.format.IGC.prototype.getExtensions = function() {
  return ol.format.IGC.EXTENSIONS_;
};


/**
 * Read the feature from the IGC source.
 *
 * @function
 * @param {Document|Node|Object|string} source Source.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @return {ol.Feature} Feature.
 * @api
 */
ol.format.IGC.prototype.readFeature;


/**
 * @inheritDoc
 */
ol.format.IGC.prototype.readFeatureFromText = function(text, opt_options) {
  var altitudeMode = this.altitudeMode_;
  var lines = text.split(ol.format.IGC.NEWLINE_RE_);
  /** @type {Object.<string, string>} */
  var properties = {};
  var flatCoordinates = [];
  var year = 2000;
  var month = 0;
  var day = 1;
  var lastDateTime = -1;
  var i, ii;
  for (i = 0, ii = lines.length; i < ii; ++i) {
    var line = lines[i];
    var m;
    if (line.charAt(0) == 'B') {
      m = ol.format.IGC.B_RECORD_RE_.exec(line);
      if (m) {
        var hour = parseInt(m[1], 10);
        var minute = parseInt(m[2], 10);
        var second = parseInt(m[3], 10);
        var y = parseInt(m[4], 10) + parseInt(m[5], 10) / 60000;
        if (m[6] == 'S') {
          y = -y;
        }
        var x = parseInt(m[7], 10) + parseInt(m[8], 10) / 60000;
        if (m[9] == 'W') {
          x = -x;
        }
        flatCoordinates.push(x, y);
        if (altitudeMode != ol.format.IGCZ.NONE) {
          var z;
          if (altitudeMode == ol.format.IGCZ.GPS) {
            z = parseInt(m[11], 10);
          } else if (altitudeMode == ol.format.IGCZ.BAROMETRIC) {
            z = parseInt(m[12], 10);
          } else {
            goog.DEBUG && console.assert(false, 'Unknown altitude mode.');
            z = 0;
          }
          flatCoordinates.push(z);
        }
        var dateTime = Date.UTC(year, month, day, hour, minute, second);
        // Detect UTC midnight wrap around.
        if (dateTime < lastDateTime) {
          dateTime = Date.UTC(year, month, day + 1, hour, minute, second);
        }
        flatCoordinates.push(dateTime / 1000);
        lastDateTime = dateTime;
      }
    } else if (line.charAt(0) == 'H') {
      m = ol.format.IGC.HFDTE_RECORD_RE_.exec(line);
      if (m) {
        day = parseInt(m[1], 10);
        month = parseInt(m[2], 10) - 1;
        year = 2000 + parseInt(m[3], 10);
      } else {
        m = ol.format.IGC.H_RECORD_RE_.exec(line);
        if (m) {
          properties[m[1]] = m[2].trim();
        }
      }
    }
  }
  if (flatCoordinates.length === 0) {
    return null;
  }
  var lineString = new ol.geom.LineString(null);
  var layout = altitudeMode == ol.format.IGCZ.NONE ?
      ol.geom.GeometryLayout.XYM : ol.geom.GeometryLayout.XYZM;
  lineString.setFlatCoordinates(layout, flatCoordinates);
  var feature = new ol.Feature(ol.format.Feature.transformWithOptions(
      lineString, false, opt_options));
  feature.setProperties(properties);
  return feature;
};


/**
 * Read the feature from the source. As IGC sources contain a single
 * feature, this will return the feature in an array.
 *
 * @function
 * @param {Document|Node|Object|string} source Source.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @return {Array.<ol.Feature>} Features.
 * @api
 */
ol.format.IGC.prototype.readFeatures;


/**
 * @inheritDoc
 */
ol.format.IGC.prototype.readFeaturesFromText = function(text, opt_options) {
  var feature = this.readFeatureFromText(text, opt_options);
  if (feature) {
    return [feature];
  } else {
    return [];
  }
};


/**
 * Read the projection from the IGC source.
 *
 * @function
 * @param {Document|Node|Object|string} source Source.
 * @return {ol.proj.Projection} Projection.
 * @api
 */
ol.format.IGC.prototype.readProjection;

goog.provide('ol.style.IconImage');

goog.require('ol');
goog.require('ol.dom');
goog.require('ol.events');
goog.require('ol.events.EventTarget');
goog.require('ol.events.EventType');
goog.require('ol.style');
goog.require('ol.style.ImageState');


/**
 * @constructor
 * @param {Image|HTMLCanvasElement} image Image.
 * @param {string|undefined} src Src.
 * @param {ol.Size} size Size.
 * @param {?string} crossOrigin Cross origin.
 * @param {ol.style.ImageState} imageState Image state.
 * @param {ol.Color} color Color.
 * @extends {ol.events.EventTarget}
 */
ol.style.IconImage = function(image, src, size, crossOrigin, imageState,
                               color) {

  ol.events.EventTarget.call(this);

  /**
   * @private
   * @type {Image|HTMLCanvasElement}
   */
  this.hitDetectionImage_ = null;

  /**
   * @private
   * @type {Image|HTMLCanvasElement}
   */
  this.image_ = !image ? new Image() : image;

  if (crossOrigin !== null) {
    this.image_.crossOrigin = crossOrigin;
  }

  /**
   * @private
   * @type {HTMLCanvasElement}
   */
  this.canvas_ = color ?
      /** @type {HTMLCanvasElement} */ (document.createElement('CANVAS')) :
      null;

  /**
   * @private
   * @type {ol.Color}
   */
  this.color_ = color;

  /**
   * @private
   * @type {Array.<ol.EventsKey>}
   */
  this.imageListenerKeys_ = null;

  /**
   * @private
   * @type {ol.style.ImageState}
   */
  this.imageState_ = imageState;

  /**
   * @private
   * @type {ol.Size}
   */
  this.size_ = size;

  /**
   * @private
   * @type {string|undefined}
   */
  this.src_ = src;

  /**
   * @private
   * @type {boolean}
   */
  this.tainting_ = false;
  if (this.imageState_ == ol.style.ImageState.LOADED) {
    this.determineTainting_();
  }

};
ol.inherits(ol.style.IconImage, ol.events.EventTarget);


/**
 * @param {Image|HTMLCanvasElement} image Image.
 * @param {string} src Src.
 * @param {ol.Size} size Size.
 * @param {?string} crossOrigin Cross origin.
 * @param {ol.style.ImageState} imageState Image state.
 * @param {ol.Color} color Color.
 * @return {ol.style.IconImage} Icon image.
 */
ol.style.IconImage.get = function(image, src, size, crossOrigin, imageState,
                                   color) {
  var iconImageCache = ol.style.iconImageCache;
  var iconImage = iconImageCache.get(src, crossOrigin, color);
  if (!iconImage) {
    iconImage = new ol.style.IconImage(
        image, src, size, crossOrigin, imageState, color);
    iconImageCache.set(src, crossOrigin, color, iconImage);
  }
  return iconImage;
};


/**
 * @private
 */
ol.style.IconImage.prototype.determineTainting_ = function() {
  var context = ol.dom.createCanvasContext2D(1, 1);
  try {
    context.drawImage(this.image_, 0, 0);
    context.getImageData(0, 0, 1, 1);
  } catch (e) {
    this.tainting_ = true;
  }
};


/**
 * @private
 */
ol.style.IconImage.prototype.dispatchChangeEvent_ = function() {
  this.dispatchEvent(ol.events.EventType.CHANGE);
};


/**
 * @private
 */
ol.style.IconImage.prototype.handleImageError_ = function() {
  this.imageState_ = ol.style.ImageState.ERROR;
  this.unlistenImage_();
  this.dispatchChangeEvent_();
};


/**
 * @private
 */
ol.style.IconImage.prototype.handleImageLoad_ = function() {
  this.imageState_ = ol.style.ImageState.LOADED;
  if (this.size_) {
    this.image_.width = this.size_[0];
    this.image_.height = this.size_[1];
  }
  this.size_ = [this.image_.width, this.image_.height];
  this.unlistenImage_();
  this.determineTainting_();
  this.replaceColor_();
  this.dispatchChangeEvent_();
};


/**
 * @param {number} pixelRatio Pixel ratio.
 * @return {Image|HTMLCanvasElement} Image or Canvas element.
 */
ol.style.IconImage.prototype.getImage = function(pixelRatio) {
  return this.canvas_ ? this.canvas_ : this.image_;
};


/**
 * @return {ol.style.ImageState} Image state.
 */
ol.style.IconImage.prototype.getImageState = function() {
  return this.imageState_;
};


/**
 * @param {number} pixelRatio Pixel ratio.
 * @return {Image|HTMLCanvasElement} Image element.
 */
ol.style.IconImage.prototype.getHitDetectionImage = function(pixelRatio) {
  if (!this.hitDetectionImage_) {
    if (this.tainting_) {
      var width = this.size_[0];
      var height = this.size_[1];
      var context = ol.dom.createCanvasContext2D(width, height);
      context.fillRect(0, 0, width, height);
      this.hitDetectionImage_ = context.canvas;
    } else {
      this.hitDetectionImage_ = this.image_;
    }
  }
  return this.hitDetectionImage_;
};


/**
 * @return {ol.Size} Image size.
 */
ol.style.IconImage.prototype.getSize = function() {
  return this.size_;
};


/**
 * @return {string|undefined} Image src.
 */
ol.style.IconImage.prototype.getSrc = function() {
  return this.src_;
};


/**
 * Load not yet loaded URI.
 */
ol.style.IconImage.prototype.load = function() {
  if (this.imageState_ == ol.style.ImageState.IDLE) {
    goog.DEBUG && console.assert(this.src_ !== undefined,
        'this.src_ must not be undefined');
    goog.DEBUG && console.assert(!this.imageListenerKeys_,
        'no listener keys existing');
    this.imageState_ = ol.style.ImageState.LOADING;
    this.imageListenerKeys_ = [
      ol.events.listenOnce(this.image_, ol.events.EventType.ERROR,
          this.handleImageError_, this),
      ol.events.listenOnce(this.image_, ol.events.EventType.LOAD,
          this.handleImageLoad_, this)
    ];
    try {
      this.image_.src = this.src_;
    } catch (e) {
      this.handleImageError_();
    }
  }
};


/**
 * @private
 */
ol.style.IconImage.prototype.replaceColor_ = function() {
  if (this.tainting_ || this.color_ === null) {
    return;
  }

  this.canvas_.width = this.image_.width;
  this.canvas_.height = this.image_.height;

  var ctx = this.canvas_.getContext('2d');
  ctx.drawImage(this.image_, 0, 0);

  var imgData = ctx.getImageData(0, 0, this.image_.width, this.image_.height);
  var data = imgData.data;
  var r = this.color_[0] / 255.0;
  var g = this.color_[1] / 255.0;
  var b = this.color_[2] / 255.0;

  for (var i = 0, ii = data.length; i < ii; i += 4) {
    data[i] *= r;
    data[i + 1] *= g;
    data[i + 2] *= b;
  }
  ctx.putImageData(imgData, 0, 0);
};


/**
 * Discards event handlers which listen for load completion or errors.
 *
 * @private
 */
ol.style.IconImage.prototype.unlistenImage_ = function() {
  this.imageListenerKeys_.forEach(ol.events.unlistenByKey);
  this.imageListenerKeys_ = null;
};

goog.provide('ol.style.Icon');
goog.provide('ol.style.IconAnchorUnits');
goog.provide('ol.style.IconOrigin');

goog.require('ol');
goog.require('ol.asserts');
goog.require('ol.color');
goog.require('ol.events');
goog.require('ol.events.EventType');
goog.require('ol.style.IconImage');
goog.require('ol.style.Image');
goog.require('ol.style.ImageState');


/**
 * Icon anchor units. One of 'fraction', 'pixels'.
 * @enum {string}
 */
ol.style.IconAnchorUnits = {
  FRACTION: 'fraction',
  PIXELS: 'pixels'
};


/**
 * Icon origin. One of 'bottom-left', 'bottom-right', 'top-left', 'top-right'.
 * @enum {string}
 */
ol.style.IconOrigin = {
  BOTTOM_LEFT: 'bottom-left',
  BOTTOM_RIGHT: 'bottom-right',
  TOP_LEFT: 'top-left',
  TOP_RIGHT: 'top-right'
};


/**
 * @classdesc
 * Set icon style for vector features.
 *
 * @constructor
 * @param {olx.style.IconOptions=} opt_options Options.
 * @extends {ol.style.Image}
 * @api
 */
ol.style.Icon = function(opt_options) {

  var options = opt_options || {};

  /**
   * @private
   * @type {Array.<number>}
   */
  this.anchor_ = options.anchor !== undefined ? options.anchor : [0.5, 0.5];

  /**
   * @private
   * @type {Array.<number>}
   */
  this.normalizedAnchor_ = null;

  /**
   * @private
   * @type {ol.style.IconOrigin}
   */
  this.anchorOrigin_ = options.anchorOrigin !== undefined ?
      options.anchorOrigin : ol.style.IconOrigin.TOP_LEFT;

  /**
   * @private
   * @type {ol.style.IconAnchorUnits}
   */
  this.anchorXUnits_ = options.anchorXUnits !== undefined ?
      options.anchorXUnits : ol.style.IconAnchorUnits.FRACTION;

  /**
   * @private
   * @type {ol.style.IconAnchorUnits}
   */
  this.anchorYUnits_ = options.anchorYUnits !== undefined ?
      options.anchorYUnits : ol.style.IconAnchorUnits.FRACTION;

  /**
   * @type {?string}
   */
  var crossOrigin =
      options.crossOrigin !== undefined ? options.crossOrigin : null;

  /**
   * @type {Image|HTMLCanvasElement}
   */
  var image = options.img !== undefined ? options.img : null;

  /**
   * @type {ol.Size}
   */
  var imgSize = options.imgSize !== undefined ? options.imgSize : null;

  /**
   * @type {string|undefined}
   */
  var src = options.src;

  ol.asserts.assert(!(src !== undefined && image),
      4); // `image` and `src` cannot be provided at the same time
  ol.asserts.assert(!image || (image && imgSize),
      5); // `imgSize` must be set when `image` is provided

  if ((src === undefined || src.length === 0) && image) {
    src = image.src || ol.getUid(image).toString();
  }
  ol.asserts.assert(src !== undefined && src.length > 0,
      6); // A defined and non-empty `src` or `image` must be provided

  /**
   * @type {ol.style.ImageState}
   */
  var imageState = options.src !== undefined ?
      ol.style.ImageState.IDLE : ol.style.ImageState.LOADED;

  /**
   * @type {ol.Color}
   */
  var color = options.color !== undefined ? ol.color.asArray(options.color) :
      null;

  /**
   * @private
   * @type {ol.style.IconImage}
   */
  this.iconImage_ = ol.style.IconImage.get(
      image, /** @type {string} */ (src), imgSize, crossOrigin, imageState, color);

  /**
   * @private
   * @type {Array.<number>}
   */
  this.offset_ = options.offset !== undefined ? options.offset : [0, 0];

  /**
   * @private
   * @type {ol.style.IconOrigin}
   */
  this.offsetOrigin_ = options.offsetOrigin !== undefined ?
      options.offsetOrigin : ol.style.IconOrigin.TOP_LEFT;

  /**
   * @private
   * @type {Array.<number>}
   */
  this.origin_ = null;

  /**
   * @private
   * @type {ol.Size}
   */
  this.size_ = options.size !== undefined ? options.size : null;

  /**
   * @type {number}
   */
  var opacity = options.opacity !== undefined ? options.opacity : 1;

  /**
   * @type {boolean}
   */
  var rotateWithView = options.rotateWithView !== undefined ?
      options.rotateWithView : false;

  /**
   * @type {number}
   */
  var rotation = options.rotation !== undefined ? options.rotation : 0;

  /**
   * @type {number}
   */
  var scale = options.scale !== undefined ? options.scale : 1;

  /**
   * @type {boolean}
   */
  var snapToPixel = options.snapToPixel !== undefined ?
      options.snapToPixel : true;

  ol.style.Image.call(this, {
    opacity: opacity,
    rotation: rotation,
    scale: scale,
    snapToPixel: snapToPixel,
    rotateWithView: rotateWithView
  });

};
ol.inherits(ol.style.Icon, ol.style.Image);


/**
 * @inheritDoc
 * @api
 */
ol.style.Icon.prototype.getAnchor = function() {
  if (this.normalizedAnchor_) {
    return this.normalizedAnchor_;
  }
  var anchor = this.anchor_;
  var size = this.getSize();
  if (this.anchorXUnits_ == ol.style.IconAnchorUnits.FRACTION ||
      this.anchorYUnits_ == ol.style.IconAnchorUnits.FRACTION) {
    if (!size) {
      return null;
    }
    anchor = this.anchor_.slice();
    if (this.anchorXUnits_ == ol.style.IconAnchorUnits.FRACTION) {
      anchor[0] *= size[0];
    }
    if (this.anchorYUnits_ == ol.style.IconAnchorUnits.FRACTION) {
      anchor[1] *= size[1];
    }
  }

  if (this.anchorOrigin_ != ol.style.IconOrigin.TOP_LEFT) {
    if (!size) {
      return null;
    }
    if (anchor === this.anchor_) {
      anchor = this.anchor_.slice();
    }
    if (this.anchorOrigin_ == ol.style.IconOrigin.TOP_RIGHT ||
        this.anchorOrigin_ == ol.style.IconOrigin.BOTTOM_RIGHT) {
      anchor[0] = -anchor[0] + size[0];
    }
    if (this.anchorOrigin_ == ol.style.IconOrigin.BOTTOM_LEFT ||
        this.anchorOrigin_ == ol.style.IconOrigin.BOTTOM_RIGHT) {
      anchor[1] = -anchor[1] + size[1];
    }
  }
  this.normalizedAnchor_ = anchor;
  return this.normalizedAnchor_;
};


/**
 * Get the image icon.
 * @param {number} pixelRatio Pixel ratio.
 * @return {Image|HTMLCanvasElement} Image or Canvas element.
 * @api
 */
ol.style.Icon.prototype.getImage = function(pixelRatio) {
  return this.iconImage_.getImage(pixelRatio);
};


/**
 * Real Image size used.
 * @return {ol.Size} Size.
 */
ol.style.Icon.prototype.getImageSize = function() {
  return this.iconImage_.getSize();
};


/**
 * @inheritDoc
 */
ol.style.Icon.prototype.getHitDetectionImageSize = function() {
  return this.getImageSize();
};


/**
 * @inheritDoc
 */
ol.style.Icon.prototype.getImageState = function() {
  return this.iconImage_.getImageState();
};


/**
 * @inheritDoc
 */
ol.style.Icon.prototype.getHitDetectionImage = function(pixelRatio) {
  return this.iconImage_.getHitDetectionImage(pixelRatio);
};


/**
 * @inheritDoc
 * @api
 */
ol.style.Icon.prototype.getOrigin = function() {
  if (this.origin_) {
    return this.origin_;
  }
  var offset = this.offset_;

  if (this.offsetOrigin_ != ol.style.IconOrigin.TOP_LEFT) {
    var size = this.getSize();
    var iconImageSize = this.iconImage_.getSize();
    if (!size || !iconImageSize) {
      return null;
    }
    offset = offset.slice();
    if (this.offsetOrigin_ == ol.style.IconOrigin.TOP_RIGHT ||
        this.offsetOrigin_ == ol.style.IconOrigin.BOTTOM_RIGHT) {
      offset[0] = iconImageSize[0] - size[0] - offset[0];
    }
    if (this.offsetOrigin_ == ol.style.IconOrigin.BOTTOM_LEFT ||
        this.offsetOrigin_ == ol.style.IconOrigin.BOTTOM_RIGHT) {
      offset[1] = iconImageSize[1] - size[1] - offset[1];
    }
  }
  this.origin_ = offset;
  return this.origin_;
};


/**
 * Get the image URL.
 * @return {string|undefined} Image src.
 * @api
 */
ol.style.Icon.prototype.getSrc = function() {
  return this.iconImage_.getSrc();
};


/**
 * @inheritDoc
 * @api
 */
ol.style.Icon.prototype.getSize = function() {
  return !this.size_ ? this.iconImage_.getSize() : this.size_;
};


/**
 * @inheritDoc
 */
ol.style.Icon.prototype.listenImageChange = function(listener, thisArg) {
  return ol.events.listen(this.iconImage_, ol.events.EventType.CHANGE,
      listener, thisArg);
};


/**
 * Load not yet loaded URI.
 * When rendering a feature with an icon style, the vector renderer will
 * automatically call this method. However, you might want to call this
 * method yourself for preloading or other purposes.
 * @api
 */
ol.style.Icon.prototype.load = function() {
  this.iconImage_.load();
};


/**
 * @inheritDoc
 */
ol.style.Icon.prototype.unlistenImageChange = function(listener, thisArg) {
  ol.events.unlisten(this.iconImage_, ol.events.EventType.CHANGE,
      listener, thisArg);
};

goog.provide('ol.style.Text');


goog.require('ol.style.Fill');


/**
 * @classdesc
 * Set text style for vector features.
 *
 * @constructor
 * @param {olx.style.TextOptions=} opt_options Options.
 * @api
 */
ol.style.Text = function(opt_options) {

  var options = opt_options || {};

  /**
   * @private
   * @type {string|undefined}
   */
  this.font_ = options.font;

  /**
   * @private
   * @type {number|undefined}
   */
  this.rotation_ = options.rotation;

  /**
   * @private
   * @type {boolean|undefined}
   */
  this.rotateWithView_ = options.rotateWithView;

  /**
   * @private
   * @type {number|undefined}
   */
  this.scale_ = options.scale;

  /**
   * @private
   * @type {string|undefined}
   */
  this.text_ = options.text;

  /**
   * @private
   * @type {string|undefined}
   */
  this.textAlign_ = options.textAlign;

  /**
   * @private
   * @type {string|undefined}
   */
  this.textBaseline_ = options.textBaseline;

  /**
   * @private
   * @type {ol.style.Fill}
   */
  this.fill_ = options.fill !== undefined ? options.fill :
      new ol.style.Fill({color: ol.style.Text.DEFAULT_FILL_COLOR_});

  /**
   * @private
   * @type {ol.style.Stroke}
   */
  this.stroke_ = options.stroke !== undefined ? options.stroke : null;

  /**
   * @private
   * @type {number}
   */
  this.offsetX_ = options.offsetX !== undefined ? options.offsetX : 0;

  /**
   * @private
   * @type {number}
   */
  this.offsetY_ = options.offsetY !== undefined ? options.offsetY : 0;
};


/**
 * The default fill color to use if no fill was set at construction time; a
 * blackish `#333`.
 *
 * @const {string}
 * @private
 */
ol.style.Text.DEFAULT_FILL_COLOR_ = '#333';


/**
 * Get the font name.
 * @return {string|undefined} Font.
 * @api
 */
ol.style.Text.prototype.getFont = function() {
  return this.font_;
};


/**
 * Get the x-offset for the text.
 * @return {number} Horizontal text offset.
 * @api
 */
ol.style.Text.prototype.getOffsetX = function() {
  return this.offsetX_;
};


/**
 * Get the y-offset for the text.
 * @return {number} Vertical text offset.
 * @api
 */
ol.style.Text.prototype.getOffsetY = function() {
  return this.offsetY_;
};


/**
 * Get the fill style for the text.
 * @return {ol.style.Fill} Fill style.
 * @api
 */
ol.style.Text.prototype.getFill = function() {
  return this.fill_;
};


/**
 * Determine whether the text rotates with the map.
 * @return {boolean|undefined} Rotate with map.
 * @api
 */
ol.style.Text.prototype.getRotateWithView = function() {
  return this.rotateWithView_;
};


/**
 * Get the text rotation.
 * @return {number|undefined} Rotation.
 * @api
 */
ol.style.Text.prototype.getRotation = function() {
  return this.rotation_;
};


/**
 * Get the text scale.
 * @return {number|undefined} Scale.
 * @api
 */
ol.style.Text.prototype.getScale = function() {
  return this.scale_;
};


/**
 * Get the stroke style for the text.
 * @return {ol.style.Stroke} Stroke style.
 * @api
 */
ol.style.Text.prototype.getStroke = function() {
  return this.stroke_;
};


/**
 * Get the text to be rendered.
 * @return {string|undefined} Text.
 * @api
 */
ol.style.Text.prototype.getText = function() {
  return this.text_;
};


/**
 * Get the text alignment.
 * @return {string|undefined} Text align.
 * @api
 */
ol.style.Text.prototype.getTextAlign = function() {
  return this.textAlign_;
};


/**
 * Get the text baseline.
 * @return {string|undefined} Text baseline.
 * @api
 */
ol.style.Text.prototype.getTextBaseline = function() {
  return this.textBaseline_;
};


/**
 * Set the font.
 *
 * @param {string|undefined} font Font.
 * @api
 */
ol.style.Text.prototype.setFont = function(font) {
  this.font_ = font;
};


/**
 * Set the x offset.
 *
 * @param {number} offsetX Horizontal text offset.
 * @api
 */
ol.style.Text.prototype.setOffsetX = function(offsetX) {
  this.offsetX_ = offsetX;
};


/**
 * Set the y offset.
 *
 * @param {number} offsetY Vertical text offset.
 * @api
 */
ol.style.Text.prototype.setOffsetY = function(offsetY) {
  this.offsetY_ = offsetY;
};


/**
 * Set the fill.
 *
 * @param {ol.style.Fill} fill Fill style.
 * @api
 */
ol.style.Text.prototype.setFill = function(fill) {
  this.fill_ = fill;
};


/**
 * Set the rotation.
 *
 * @param {number|undefined} rotation Rotation.
 * @api
 */
ol.style.Text.prototype.setRotation = function(rotation) {
  this.rotation_ = rotation;
};


/**
 * Set the scale.
 *
 * @param {number|undefined} scale Scale.
 * @api
 */
ol.style.Text.prototype.setScale = function(scale) {
  this.scale_ = scale;
};


/**
 * Set the stroke.
 *
 * @param {ol.style.Stroke} stroke Stroke style.
 * @api
 */
ol.style.Text.prototype.setStroke = function(stroke) {
  this.stroke_ = stroke;
};


/**
 * Set the text.
 *
 * @param {string|undefined} text Text.
 * @api
 */
ol.style.Text.prototype.setText = function(text) {
  this.text_ = text;
};


/**
 * Set the text alignment.
 *
 * @param {string|undefined} textAlign Text align.
 * @api
 */
ol.style.Text.prototype.setTextAlign = function(textAlign) {
  this.textAlign_ = textAlign;
};


/**
 * Set the text baseline.
 *
 * @param {string|undefined} textBaseline Text baseline.
 * @api
 */
ol.style.Text.prototype.setTextBaseline = function(textBaseline) {
  this.textBaseline_ = textBaseline;
};

// FIXME http://earth.google.com/kml/1.0 namespace?
// FIXME why does node.getAttribute return an unknown type?
// FIXME serialize arbitrary feature properties
// FIXME don't parse style if extractStyles is false

goog.provide('ol.format.KML');

goog.require('goog.object');
goog.require('ol');
goog.require('ol.Feature');
goog.require('ol.array');
goog.require('ol.asserts');
goog.require('ol.color');
goog.require('ol.format.Feature');
goog.require('ol.format.XMLFeature');
goog.require('ol.format.XSD');
goog.require('ol.geom.GeometryCollection');
goog.require('ol.geom.GeometryLayout');
goog.require('ol.geom.GeometryType');
goog.require('ol.geom.LineString');
goog.require('ol.geom.LinearRing');
goog.require('ol.geom.MultiLineString');
goog.require('ol.geom.MultiPoint');
goog.require('ol.geom.MultiPolygon');
goog.require('ol.geom.Point');
goog.require('ol.geom.Polygon');
goog.require('ol.math');
goog.require('ol.obj');
goog.require('ol.proj');
goog.require('ol.style.Fill');
goog.require('ol.style.Icon');
goog.require('ol.style.IconAnchorUnits');
goog.require('ol.style.IconOrigin');
goog.require('ol.style.Stroke');
goog.require('ol.style.Style');
goog.require('ol.style.Text');
goog.require('ol.xml');


/**
 * @classdesc
 * Feature format for reading and writing data in the KML format.
 *
 * Note that the KML format uses the URL() constructor. Older browsers such as IE
 * which do not support this will need a URL polyfill to be loaded before use.
 *
 * @constructor
 * @extends {ol.format.XMLFeature}
 * @param {olx.format.KMLOptions=} opt_options Options.
 * @api stable
 */
ol.format.KML = function(opt_options) {

  var options = opt_options ? opt_options : {};

  ol.format.XMLFeature.call(this);

  /**
   * @inheritDoc
   */
  this.defaultDataProjection = ol.proj.get('EPSG:4326');

  /**
   * @private
   * @type {Array.<ol.style.Style>}
   */
  this.defaultStyle_ = options.defaultStyle ?
      options.defaultStyle :
      (ol.format.KML.DEFAULT_STYLE_ARRAY_ || ol.format.KML.createStyleDefaults_());

  /**
   * @private
   * @type {boolean}
   */
  this.extractStyles_ = options.extractStyles !== undefined ?
      options.extractStyles : true;

  /**
   * @private
   * @type {boolean}
   */
  this.writeStyles_ = options.writeStyles !== undefined ?
      options.writeStyles : true;

  /**
   * @private
   * @type {Object.<string, (Array.<ol.style.Style>|string)>}
   */
  this.sharedStyles_ = {};

  /**
   * @private
   * @type {boolean}
   */
  this.showPointNames_ = options.showPointNames !== undefined ?
      options.showPointNames : true;

};
ol.inherits(ol.format.KML, ol.format.XMLFeature);


/**
 * @const
 * @type {Array.<string>}
 * @private
 */
ol.format.KML.EXTENSIONS_ = ['.kml'];


/**
 * @const
 * @type {Array.<string>}
 * @private
 */
ol.format.KML.GX_NAMESPACE_URIS_ = [
  'http://www.google.com/kml/ext/2.2'
];


/**
 * @const
 * @type {Array.<string>}
 * @private
 */
ol.format.KML.NAMESPACE_URIS_ = [
  null,
  'http://earth.google.com/kml/2.0',
  'http://earth.google.com/kml/2.1',
  'http://earth.google.com/kml/2.2',
  'http://www.opengis.net/kml/2.2'
];


/**
 * @const
 * @type {string}
 * @private
 */
ol.format.KML.SCHEMA_LOCATION_ = 'http://www.opengis.net/kml/2.2 ' +
    'https://developers.google.com/kml/schema/kml22gx.xsd';


/**
 * @return {Array.<ol.style.Style>} Default style.
 * @private
 */
ol.format.KML.createStyleDefaults_ = function() {
  /**
   * @const
   * @type {ol.Color}
   * @private
   */
  ol.format.KML.DEFAULT_COLOR_ = [255, 255, 255, 1];

  /**
   * @const
   * @type {ol.style.Fill}
   * @private
   */
  ol.format.KML.DEFAULT_FILL_STYLE_ = new ol.style.Fill({
    color: ol.format.KML.DEFAULT_COLOR_
  });

  /**
   * @const
   * @type {ol.Size}
   * @private
   */
  ol.format.KML.DEFAULT_IMAGE_STYLE_ANCHOR_ = [20, 2]; // FIXME maybe [8, 32] ?

  /**
   * @const
   * @type {ol.style.IconAnchorUnits}
   * @private
   */
  ol.format.KML.DEFAULT_IMAGE_STYLE_ANCHOR_X_UNITS_ =
      ol.style.IconAnchorUnits.PIXELS;

  /**
   * @const
   * @type {ol.style.IconAnchorUnits}
   * @private
   */
  ol.format.KML.DEFAULT_IMAGE_STYLE_ANCHOR_Y_UNITS_ =
      ol.style.IconAnchorUnits.PIXELS;

  /**
   * @const
   * @type {ol.Size}
   * @private
   */
  ol.format.KML.DEFAULT_IMAGE_STYLE_SIZE_ = [64, 64];

  /**
   * @const
   * @type {string}
   * @private
   */
  ol.format.KML.DEFAULT_IMAGE_STYLE_SRC_ =
      'https://maps.google.com/mapfiles/kml/pushpin/ylw-pushpin.png';

  /**
   * @const
   * @type {number}
   * @private
   */
  ol.format.KML.DEFAULT_IMAGE_SCALE_MULTIPLIER_ = 0.5;

  /**
   * @const
   * @type {ol.style.Image}
   * @private
   */
  ol.format.KML.DEFAULT_IMAGE_STYLE_ = new ol.style.Icon({
    anchor: ol.format.KML.DEFAULT_IMAGE_STYLE_ANCHOR_,
    anchorOrigin: ol.style.IconOrigin.BOTTOM_LEFT,
    anchorXUnits: ol.format.KML.DEFAULT_IMAGE_STYLE_ANCHOR_X_UNITS_,
    anchorYUnits: ol.format.KML.DEFAULT_IMAGE_STYLE_ANCHOR_Y_UNITS_,
    crossOrigin: 'anonymous',
    rotation: 0,
    scale: ol.format.KML.DEFAULT_IMAGE_SCALE_MULTIPLIER_,
    size: ol.format.KML.DEFAULT_IMAGE_STYLE_SIZE_,
    src: ol.format.KML.DEFAULT_IMAGE_STYLE_SRC_
  });

  /**
   * @const
   * @type {ol.style.Stroke}
   * @private
   */
  ol.format.KML.DEFAULT_STROKE_STYLE_ = new ol.style.Stroke({
    color: ol.format.KML.DEFAULT_COLOR_,
    width: 1
  });

  /**
   * @const
   * @type {ol.style.Stroke}
   * @private
   */
  ol.format.KML.DEFAULT_TEXT_STROKE_STYLE_ = new ol.style.Stroke({
    color: [51, 51, 51, 1],
    width: 2
  });

  /**
   * @const
   * @type {ol.style.Text}
   * @private
   */
  ol.format.KML.DEFAULT_TEXT_STYLE_ = new ol.style.Text({
    font: 'bold 16px Helvetica',
    fill: ol.format.KML.DEFAULT_FILL_STYLE_,
    stroke: ol.format.KML.DEFAULT_TEXT_STROKE_STYLE_,
    scale: 0.8
  });

  /**
   * @const
   * @type {ol.style.Style}
   * @private
   */
  ol.format.KML.DEFAULT_STYLE_ = new ol.style.Style({
    fill: ol.format.KML.DEFAULT_FILL_STYLE_,
    image: ol.format.KML.DEFAULT_IMAGE_STYLE_,
    text: ol.format.KML.DEFAULT_TEXT_STYLE_,
    stroke: ol.format.KML.DEFAULT_STROKE_STYLE_,
    zIndex: 0
  });

  /**
   * @const
   * @type {Array.<ol.style.Style>}
   * @private
   */
  ol.format.KML.DEFAULT_STYLE_ARRAY_ = [ol.format.KML.DEFAULT_STYLE_];

  return ol.format.KML.DEFAULT_STYLE_ARRAY_;
};


/**
 * @const
 * @type {Object.<string, ol.style.IconAnchorUnits>}
 * @private
 */
ol.format.KML.ICON_ANCHOR_UNITS_MAP_ = {
  'fraction': ol.style.IconAnchorUnits.FRACTION,
  'pixels': ol.style.IconAnchorUnits.PIXELS
};


/**
 * @param {ol.style.Style|undefined} foundStyle Style.
 * @param {string} name Name.
 * @return {ol.style.Style} style Style.
 * @private
 */
ol.format.KML.createNameStyleFunction_ = function(foundStyle, name) {
  var textStyle = null;
  var textOffset = [0, 0];
  var textAlign = 'start';
  if (foundStyle.getImage()) {
    var imageSize = foundStyle.getImage().getImageSize();
    if (imageSize && imageSize.length == 2) {
      // Offset the label to be centered to the right of the icon, if there is
      // one.
      textOffset[0] = foundStyle.getImage().getScale() * imageSize[0] / 2;
      textOffset[1] = -foundStyle.getImage().getScale() * imageSize[1] / 2;
      textAlign = 'left';
    }
  }
  if (!ol.obj.isEmpty(foundStyle.getText())) {
    textStyle = /** @type {ol.style.Text} */
        (goog.object.clone(foundStyle.getText()));
    textStyle.setText(name);
    textStyle.setTextAlign(textAlign);
    textStyle.setOffsetX(textOffset[0]);
    textStyle.setOffsetY(textOffset[1]);
  } else {
    textStyle = new ol.style.Text({
      text: name,
      offsetX: textOffset[0],
      offsetY: textOffset[1],
      textAlign: textAlign
    });
  }
  var nameStyle = new ol.style.Style({
    text: textStyle
  });
  return nameStyle;
};


/**
 * @param {Array.<ol.style.Style>|undefined} style Style.
 * @param {string} styleUrl Style URL.
 * @param {Array.<ol.style.Style>} defaultStyle Default style.
 * @param {Object.<string, (Array.<ol.style.Style>|string)>} sharedStyles Shared
 *          styles.
 * @param {boolean|undefined} showPointNames true to show names for point
 *          placemarks.
 * @return {ol.FeatureStyleFunction} Feature style function.
 * @private
 */
ol.format.KML.createFeatureStyleFunction_ = function(style, styleUrl,
    defaultStyle, sharedStyles, showPointNames) {

  return (
      /**
       * @param {number} resolution Resolution.
       * @return {Array.<ol.style.Style>} Style.
       * @this {ol.Feature}
       */
      function(resolution) {
        var drawName = showPointNames;
        /** @type {ol.style.Style|undefined} */
        var nameStyle;
        var name = '';
        if (drawName) {
          if (this.getGeometry()) {
            drawName = (this.getGeometry().getType() ===
                        ol.geom.GeometryType.POINT);
          }
        }

        if (drawName) {
          name = /** @type {string} */ (this.get('name'));
          drawName = drawName && name;
        }

        if (style) {
          if (drawName) {
            nameStyle = ol.format.KML.createNameStyleFunction_(style[0],
                name);
            return style.concat(nameStyle);
          }
          return style;
        }
        if (styleUrl) {
          var foundStyle = ol.format.KML.findStyle_(styleUrl, defaultStyle,
              sharedStyles);
          if (drawName) {
            nameStyle = ol.format.KML.createNameStyleFunction_(foundStyle[0],
                name);
            return foundStyle.concat(nameStyle);
          }
          return foundStyle;
        }
        if (drawName) {
          nameStyle = ol.format.KML.createNameStyleFunction_(defaultStyle[0],
              name);
          return defaultStyle.concat(nameStyle);
        }
        return defaultStyle;
      });
};


/**
 * @param {Array.<ol.style.Style>|string|undefined} styleValue Style value.
 * @param {Array.<ol.style.Style>} defaultStyle Default style.
 * @param {Object.<string, (Array.<ol.style.Style>|string)>} sharedStyles
 * Shared styles.
 * @return {Array.<ol.style.Style>} Style.
 * @private
 */
ol.format.KML.findStyle_ = function(styleValue, defaultStyle, sharedStyles) {
  if (Array.isArray(styleValue)) {
    return styleValue;
  } else if (typeof styleValue === 'string') {
    // KML files in the wild occasionally forget the leading `#` on styleUrls
    // defined in the same document.  Add a leading `#` if it enables to find
    // a style.
    if (!(styleValue in sharedStyles) && ('#' + styleValue in sharedStyles)) {
      styleValue = '#' + styleValue;
    }
    return ol.format.KML.findStyle_(
        sharedStyles[styleValue], defaultStyle, sharedStyles);
  } else {
    return defaultStyle;
  }
};


/**
 * @param {Node} node Node.
 * @private
 * @return {ol.Color|undefined} Color.
 */
ol.format.KML.readColor_ = function(node) {
  var s = ol.xml.getAllTextContent(node, false);
  // The KML specification states that colors should not include a leading `#`
  // but we tolerate them.
  var m = /^\s*#?\s*([0-9A-Fa-f]{8})\s*$/.exec(s);
  if (m) {
    var hexColor = m[1];
    return [
      parseInt(hexColor.substr(6, 2), 16),
      parseInt(hexColor.substr(4, 2), 16),
      parseInt(hexColor.substr(2, 2), 16),
      parseInt(hexColor.substr(0, 2), 16) / 255
    ];

  } else {
    return undefined;
  }
};


/**
 * @param {Node} node Node.
 * @private
 * @return {Array.<number>|undefined} Flat coordinates.
 */
ol.format.KML.readFlatCoordinates_ = function(node) {
  var s = ol.xml.getAllTextContent(node, false);
  var flatCoordinates = [];
  // The KML specification states that coordinate tuples should not include
  // spaces, but we tolerate them.
  var re =
      /^\s*([+\-]?\d*\.?\d+(?:e[+\-]?\d+)?)\s*,\s*([+\-]?\d*\.?\d+(?:e[+\-]?\d+)?)(?:\s*,\s*([+\-]?\d*\.?\d+(?:e[+\-]?\d+)?))?\s*/i;
  var m;
  while ((m = re.exec(s))) {
    var x = parseFloat(m[1]);
    var y = parseFloat(m[2]);
    var z = m[3] ? parseFloat(m[3]) : 0;
    flatCoordinates.push(x, y, z);
    s = s.substr(m[0].length);
  }
  if (s !== '') {
    return undefined;
  }
  return flatCoordinates;
};


/**
 * @param {Node} node Node.
 * @private
 * @return {string} URI.
 */
ol.format.KML.readURI_ = function(node) {
  var s = ol.xml.getAllTextContent(node, false).trim();
  if (node.baseURI) {
    var url = new URL(s, node.baseURI);
    return url.href;
  } else {
    return s;
  }
};


/**
 * @param {Node} node Node.
 * @private
 * @return {ol.KMLVec2_} Vec2.
 */
ol.format.KML.readVec2_ = function(node) {
  var xunits = node.getAttribute('xunits');
  var yunits = node.getAttribute('yunits');
  return {
    x: parseFloat(node.getAttribute('x')),
    xunits: ol.format.KML.ICON_ANCHOR_UNITS_MAP_[xunits],
    y: parseFloat(node.getAttribute('y')),
    yunits: ol.format.KML.ICON_ANCHOR_UNITS_MAP_[yunits]
  };
};


/**
 * @param {Node} node Node.
 * @private
 * @return {number|undefined} Scale.
 */
ol.format.KML.readScale_ = function(node) {
  var number = ol.format.XSD.readDecimal(node);
  if (number !== undefined) {
    return Math.sqrt(number);
  } else {
    return undefined;
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Array.<ol.style.Style>|string|undefined} StyleMap.
 */
ol.format.KML.readStyleMapValue_ = function(node, objectStack) {
  return ol.xml.pushParseAndPop(undefined,
      ol.format.KML.STYLE_MAP_PARSERS_, node, objectStack);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.KML.IconStyleParser_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be an ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'IconStyle',
      'localName should be IconStyle');
  // FIXME refreshMode
  // FIXME refreshInterval
  // FIXME viewRefreshTime
  // FIXME viewBoundScale
  // FIXME viewFormat
  // FIXME httpQuery
  var object = ol.xml.pushParseAndPop(
      {}, ol.format.KML.ICON_STYLE_PARSERS_, node, objectStack);
  if (!object) {
    return;
  }
  var styleObject = /** @type {Object} */ (objectStack[objectStack.length - 1]);
  var IconObject = 'Icon' in object ? object['Icon'] : {};
  var src;
  var href = /** @type {string|undefined} */
      (IconObject['href']);
  if (href) {
    src = href;
  } else {
    src = ol.format.KML.DEFAULT_IMAGE_STYLE_SRC_;
  }
  var anchor, anchorXUnits, anchorYUnits;
  var hotSpot = /** @type {ol.KMLVec2_|undefined} */
      (object['hotSpot']);
  if (hotSpot) {
    anchor = [hotSpot.x, hotSpot.y];
    anchorXUnits = hotSpot.xunits;
    anchorYUnits = hotSpot.yunits;
  } else if (src === ol.format.KML.DEFAULT_IMAGE_STYLE_SRC_) {
    anchor = ol.format.KML.DEFAULT_IMAGE_STYLE_ANCHOR_;
    anchorXUnits = ol.format.KML.DEFAULT_IMAGE_STYLE_ANCHOR_X_UNITS_;
    anchorYUnits = ol.format.KML.DEFAULT_IMAGE_STYLE_ANCHOR_Y_UNITS_;
  } else if (/^http:\/\/maps\.(?:google|gstatic)\.com\//.test(src)) {
    anchor = [0.5, 0];
    anchorXUnits = ol.style.IconAnchorUnits.FRACTION;
    anchorYUnits = ol.style.IconAnchorUnits.FRACTION;
  }

  var offset;
  var x = /** @type {number|undefined} */
      (IconObject['x']);
  var y = /** @type {number|undefined} */
      (IconObject['y']);
  if (x !== undefined && y !== undefined) {
    offset = [x, y];
  }

  var size;
  var w = /** @type {number|undefined} */
      (IconObject['w']);
  var h = /** @type {number|undefined} */
      (IconObject['h']);
  if (w !== undefined && h !== undefined) {
    size = [w, h];
  }

  var rotation;
  var heading = /** @type {number} */
      (object['heading']);
  if (heading !== undefined) {
    rotation = ol.math.toRadians(heading);
  }

  var scale = /** @type {number|undefined} */
      (object['scale']);
  if (src == ol.format.KML.DEFAULT_IMAGE_STYLE_SRC_) {
    size = ol.format.KML.DEFAULT_IMAGE_STYLE_SIZE_;
    if (scale === undefined) {
      scale = ol.format.KML.DEFAULT_IMAGE_SCALE_MULTIPLIER_;
    }
  }

  var imageStyle = new ol.style.Icon({
    anchor: anchor,
    anchorOrigin: ol.style.IconOrigin.BOTTOM_LEFT,
    anchorXUnits: anchorXUnits,
    anchorYUnits: anchorYUnits,
    crossOrigin: 'anonymous', // FIXME should this be configurable?
    offset: offset,
    offsetOrigin: ol.style.IconOrigin.BOTTOM_LEFT,
    rotation: rotation,
    scale: scale,
    size: size,
    src: src
  });
  styleObject['imageStyle'] = imageStyle;
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.KML.LabelStyleParser_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'LabelStyle',
      'localName should be LabelStyle');
  // FIXME colorMode
  var object = ol.xml.pushParseAndPop(
      {}, ol.format.KML.LABEL_STYLE_PARSERS_, node, objectStack);
  if (!object) {
    return;
  }
  var styleObject = objectStack[objectStack.length - 1];
  var textStyle = new ol.style.Text({
    fill: new ol.style.Fill({
      color: /** @type {ol.Color} */
          ('color' in object ? object['color'] : ol.format.KML.DEFAULT_COLOR_)
    }),
    scale: /** @type {number|undefined} */
        (object['scale'])
  });
  styleObject['textStyle'] = textStyle;
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.KML.LineStyleParser_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'LineStyle',
      'localName should be LineStyle');
  // FIXME colorMode
  // FIXME gx:outerColor
  // FIXME gx:outerWidth
  // FIXME gx:physicalWidth
  // FIXME gx:labelVisibility
  var object = ol.xml.pushParseAndPop(
      {}, ol.format.KML.LINE_STYLE_PARSERS_, node, objectStack);
  if (!object) {
    return;
  }
  var styleObject = objectStack[objectStack.length - 1];
  var strokeStyle = new ol.style.Stroke({
    color: /** @type {ol.Color} */
        ('color' in object ? object['color'] : ol.format.KML.DEFAULT_COLOR_),
    width: /** @type {number} */ ('width' in object ? object['width'] : 1)
  });
  styleObject['strokeStyle'] = strokeStyle;
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.KML.PolyStyleParser_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'PolyStyle',
      'localName should be PolyStyle');
  // FIXME colorMode
  var object = ol.xml.pushParseAndPop(
      {}, ol.format.KML.POLY_STYLE_PARSERS_, node, objectStack);
  if (!object) {
    return;
  }
  var styleObject = objectStack[objectStack.length - 1];
  var fillStyle = new ol.style.Fill({
    color: /** @type {ol.Color} */
        ('color' in object ? object['color'] : ol.format.KML.DEFAULT_COLOR_)
  });
  styleObject['fillStyle'] = fillStyle;
  var fill = /** @type {boolean|undefined} */ (object['fill']);
  if (fill !== undefined) {
    styleObject['fill'] = fill;
  }
  var outline =
      /** @type {boolean|undefined} */ (object['outline']);
  if (outline !== undefined) {
    styleObject['outline'] = outline;
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Array.<number>} LinearRing flat coordinates.
 */
ol.format.KML.readFlatLinearRing_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'LinearRing',
      'localName should be LinearRing');
  return ol.xml.pushParseAndPop(null,
      ol.format.KML.FLAT_LINEAR_RING_PARSERS_, node, objectStack);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.KML.gxCoordParser_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(ol.array.includes(
      ol.format.KML.GX_NAMESPACE_URIS_, node.namespaceURI),
      'namespaceURI of the node should be known to the KML parser');
  goog.DEBUG && console.assert(node.localName == 'coord', 'localName should be coord');
  var gxTrackObject = /** @type {ol.KMLGxTrackObject_} */
      (objectStack[objectStack.length - 1]);
  var flatCoordinates = gxTrackObject.flatCoordinates;
  var s = ol.xml.getAllTextContent(node, false);
  var re =
      /^\s*([+\-]?\d+(?:\.\d*)?(?:e[+\-]?\d*)?)\s+([+\-]?\d+(?:\.\d*)?(?:e[+\-]?\d*)?)\s+([+\-]?\d+(?:\.\d*)?(?:e[+\-]?\d*)?)\s*$/i;
  var m = re.exec(s);
  if (m) {
    var x = parseFloat(m[1]);
    var y = parseFloat(m[2]);
    var z = parseFloat(m[3]);
    flatCoordinates.push(x, y, z, 0);
  } else {
    flatCoordinates.push(0, 0, 0, 0);
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {ol.geom.MultiLineString|undefined} MultiLineString.
 */
ol.format.KML.readGxMultiTrack_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(ol.array.includes(
      ol.format.KML.GX_NAMESPACE_URIS_, node.namespaceURI),
      'namespaceURI of the node should be known to the KML parser');
  goog.DEBUG && console.assert(node.localName == 'MultiTrack',
      'localName should be MultiTrack');
  var lineStrings = ol.xml.pushParseAndPop([],
      ol.format.KML.GX_MULTITRACK_GEOMETRY_PARSERS_, node, objectStack);
  if (!lineStrings) {
    return undefined;
  }
  var multiLineString = new ol.geom.MultiLineString(null);
  multiLineString.setLineStrings(lineStrings);
  return multiLineString;
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {ol.geom.LineString|undefined} LineString.
 */
ol.format.KML.readGxTrack_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(ol.array.includes(
      ol.format.KML.GX_NAMESPACE_URIS_, node.namespaceURI),
      'namespaceURI of the node should be known to the KML parser');
  goog.DEBUG && console.assert(node.localName == 'Track', 'localName should be Track');
  var gxTrackObject = ol.xml.pushParseAndPop(
      /** @type {ol.KMLGxTrackObject_} */ ({
        flatCoordinates: [],
        whens: []
      }), ol.format.KML.GX_TRACK_PARSERS_, node, objectStack);
  if (!gxTrackObject) {
    return undefined;
  }
  var flatCoordinates = gxTrackObject.flatCoordinates;
  var whens = gxTrackObject.whens;
  goog.DEBUG && console.assert(flatCoordinates.length / 4 == whens.length,
      'the length of the flatCoordinates array divided by 4 should be the ' +
      'length of the whens array');
  var i, ii;
  for (i = 0, ii = Math.min(flatCoordinates.length, whens.length); i < ii;
       ++i) {
    flatCoordinates[4 * i + 3] = whens[i];
  }
  var lineString = new ol.geom.LineString(null);
  lineString.setFlatCoordinates(ol.geom.GeometryLayout.XYZM, flatCoordinates);
  return lineString;
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Object} Icon object.
 */
ol.format.KML.readIcon_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Icon', 'localName should be Icon');
  var iconObject = ol.xml.pushParseAndPop(
      {}, ol.format.KML.ICON_PARSERS_, node, objectStack);
  if (iconObject) {
    return iconObject;
  } else {
    return null;
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Array.<number>} Flat coordinates.
 */
ol.format.KML.readFlatCoordinatesFromNode_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  return ol.xml.pushParseAndPop(null,
      ol.format.KML.GEOMETRY_FLAT_COORDINATES_PARSERS_, node, objectStack);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {ol.geom.LineString|undefined} LineString.
 */
ol.format.KML.readLineString_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'LineString',
      'localName should be LineString');
  var properties = ol.xml.pushParseAndPop({},
      ol.format.KML.EXTRUDE_AND_ALTITUDE_MODE_PARSERS_, node,
      objectStack);
  var flatCoordinates =
      ol.format.KML.readFlatCoordinatesFromNode_(node, objectStack);
  if (flatCoordinates) {
    var lineString = new ol.geom.LineString(null);
    lineString.setFlatCoordinates(ol.geom.GeometryLayout.XYZ, flatCoordinates);
    lineString.setProperties(properties);
    return lineString;
  } else {
    return undefined;
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {ol.geom.Polygon|undefined} Polygon.
 */
ol.format.KML.readLinearRing_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'LinearRing',
      'localName should be LinearRing');
  var properties = ol.xml.pushParseAndPop({},
      ol.format.KML.EXTRUDE_AND_ALTITUDE_MODE_PARSERS_, node,
      objectStack);
  var flatCoordinates =
      ol.format.KML.readFlatCoordinatesFromNode_(node, objectStack);
  if (flatCoordinates) {
    var polygon = new ol.geom.Polygon(null);
    polygon.setFlatCoordinates(ol.geom.GeometryLayout.XYZ, flatCoordinates,
        [flatCoordinates.length]);
    polygon.setProperties(properties);
    return polygon;
  } else {
    return undefined;
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {ol.geom.Geometry} Geometry.
 */
ol.format.KML.readMultiGeometry_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'MultiGeometry',
      'localName should be MultiGeometry');
  var geometries = ol.xml.pushParseAndPop([],
      ol.format.KML.MULTI_GEOMETRY_PARSERS_, node, objectStack);
  if (!geometries) {
    return null;
  }
  if (geometries.length === 0) {
    return new ol.geom.GeometryCollection(geometries);
  }
  /** @type {ol.geom.Geometry} */
  var multiGeometry;
  var homogeneous = true;
  var type = geometries[0].getType();
  var geometry, i, ii;
  for (i = 1, ii = geometries.length; i < ii; ++i) {
    geometry = geometries[i];
    if (geometry.getType() != type) {
      homogeneous = false;
      break;
    }
  }
  if (homogeneous) {
    var layout;
    var flatCoordinates;
    if (type == ol.geom.GeometryType.POINT) {
      var point = geometries[0];
      layout = point.getLayout();
      flatCoordinates = point.getFlatCoordinates();
      for (i = 1, ii = geometries.length; i < ii; ++i) {
        geometry = geometries[i];
        goog.DEBUG && console.assert(geometry.getLayout() == layout,
            'geometry layout should be consistent');
        ol.array.extend(flatCoordinates, geometry.getFlatCoordinates());
      }
      multiGeometry = new ol.geom.MultiPoint(null);
      multiGeometry.setFlatCoordinates(layout, flatCoordinates);
      ol.format.KML.setCommonGeometryProperties_(multiGeometry, geometries);
    } else if (type == ol.geom.GeometryType.LINE_STRING) {
      multiGeometry = new ol.geom.MultiLineString(null);
      multiGeometry.setLineStrings(geometries);
      ol.format.KML.setCommonGeometryProperties_(multiGeometry, geometries);
    } else if (type == ol.geom.GeometryType.POLYGON) {
      multiGeometry = new ol.geom.MultiPolygon(null);
      multiGeometry.setPolygons(geometries);
      ol.format.KML.setCommonGeometryProperties_(multiGeometry, geometries);
    } else if (type == ol.geom.GeometryType.GEOMETRY_COLLECTION) {
      multiGeometry = new ol.geom.GeometryCollection(geometries);
    } else {
      ol.asserts.assert(false, 37); // Unknown geometry type found
    }
  } else {
    multiGeometry = new ol.geom.GeometryCollection(geometries);
  }
  return /** @type {ol.geom.Geometry} */ (multiGeometry);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {ol.geom.Point|undefined} Point.
 */
ol.format.KML.readPoint_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Point', 'localName should be Point');
  var properties = ol.xml.pushParseAndPop({},
      ol.format.KML.EXTRUDE_AND_ALTITUDE_MODE_PARSERS_, node,
      objectStack);
  var flatCoordinates =
      ol.format.KML.readFlatCoordinatesFromNode_(node, objectStack);
  if (flatCoordinates) {
    var point = new ol.geom.Point(null);
    goog.DEBUG && console.assert(flatCoordinates.length == 3,
        'flatCoordinates should have a length of 3');
    point.setFlatCoordinates(ol.geom.GeometryLayout.XYZ, flatCoordinates);
    point.setProperties(properties);
    return point;
  } else {
    return undefined;
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {ol.geom.Polygon|undefined} Polygon.
 */
ol.format.KML.readPolygon_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Polygon',
      'localName should be Polygon');
  var properties = ol.xml.pushParseAndPop(/** @type {Object<string,*>} */ ({}),
      ol.format.KML.EXTRUDE_AND_ALTITUDE_MODE_PARSERS_, node,
      objectStack);
  var flatLinearRings = ol.xml.pushParseAndPop([null],
      ol.format.KML.FLAT_LINEAR_RINGS_PARSERS_, node, objectStack);
  if (flatLinearRings && flatLinearRings[0]) {
    var polygon = new ol.geom.Polygon(null);
    var flatCoordinates = flatLinearRings[0];
    var ends = [flatCoordinates.length];
    var i, ii;
    for (i = 1, ii = flatLinearRings.length; i < ii; ++i) {
      ol.array.extend(flatCoordinates, flatLinearRings[i]);
      ends.push(flatCoordinates.length);
    }
    polygon.setFlatCoordinates(
        ol.geom.GeometryLayout.XYZ, flatCoordinates, ends);
    polygon.setProperties(properties);
    return polygon;
  } else {
    return undefined;
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Array.<ol.style.Style>} Style.
 */
ol.format.KML.readStyle_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Style', 'localName should be Style');
  var styleObject = ol.xml.pushParseAndPop(
      {}, ol.format.KML.STYLE_PARSERS_, node, objectStack);
  if (!styleObject) {
    return null;
  }
  var fillStyle = /** @type {ol.style.Fill} */
      ('fillStyle' in styleObject ?
          styleObject['fillStyle'] : ol.format.KML.DEFAULT_FILL_STYLE_);
  var fill = /** @type {boolean|undefined} */ (styleObject['fill']);
  if (fill !== undefined && !fill) {
    fillStyle = null;
  }
  var imageStyle = /** @type {ol.style.Image} */
      ('imageStyle' in styleObject ?
          styleObject['imageStyle'] : ol.format.KML.DEFAULT_IMAGE_STYLE_);
  var textStyle = /** @type {ol.style.Text} */
      ('textStyle' in styleObject ?
          styleObject['textStyle'] : ol.format.KML.DEFAULT_TEXT_STYLE_);
  var strokeStyle = /** @type {ol.style.Stroke} */
      ('strokeStyle' in styleObject ?
          styleObject['strokeStyle'] : ol.format.KML.DEFAULT_STROKE_STYLE_);
  var outline = /** @type {boolean|undefined} */
      (styleObject['outline']);
  if (outline !== undefined && !outline) {
    strokeStyle = null;
  }
  return [new ol.style.Style({
    fill: fillStyle,
    image: imageStyle,
    stroke: strokeStyle,
    text: textStyle,
    zIndex: undefined // FIXME
  })];
};


/**
 * Reads an array of geometries and creates arrays for common geometry
 * properties. Then sets them to the multi geometry.
 * @param {ol.geom.MultiPoint|ol.geom.MultiLineString|ol.geom.MultiPolygon}
 *     multiGeometry A multi-geometry.
 * @param {Array.<ol.geom.Geometry>} geometries List of geometries.
 * @private
 */
ol.format.KML.setCommonGeometryProperties_ = function(multiGeometry,
    geometries) {
  var ii = geometries.length;
  var extrudes = new Array(geometries.length);
  var altitudeModes = new Array(geometries.length);
  var geometry, i, hasExtrude, hasAltitudeMode;
  hasExtrude = hasAltitudeMode = false;
  for (i = 0; i < ii; ++i) {
    geometry = geometries[i];
    extrudes[i] = geometry.get('extrude');
    altitudeModes[i] = geometry.get('altitudeMode');
    hasExtrude = hasExtrude || extrudes[i] !== undefined;
    hasAltitudeMode = hasAltitudeMode || altitudeModes[i];
  }
  if (hasExtrude) {
    multiGeometry.set('extrude', extrudes);
  }
  if (hasAltitudeMode) {
    multiGeometry.set('altitudeMode', altitudeModes);
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.KML.DataParser_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Data', 'localName should be Data');
  var name = node.getAttribute('name');
  if (name !== null) {
    var data = ol.xml.pushParseAndPop(
        undefined, ol.format.KML.DATA_PARSERS_, node, objectStack);
    if (data) {
      var featureObject =
          /** @type {Object} */ (objectStack[objectStack.length - 1]);
      featureObject[name] = data;
    }
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.KML.ExtendedDataParser_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'ExtendedData',
      'localName should be ExtendedData');
  ol.xml.parseNode(ol.format.KML.EXTENDED_DATA_PARSERS_, node, objectStack);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.KML.PairDataParser_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Pair', 'localName should be Pair');
  var pairObject = ol.xml.pushParseAndPop(
      {}, ol.format.KML.PAIR_PARSERS_, node, objectStack);
  if (!pairObject) {
    return;
  }
  var key = /** @type {string|undefined} */
      (pairObject['key']);
  if (key && key == 'normal') {
    var styleUrl = /** @type {string|undefined} */
        (pairObject['styleUrl']);
    if (styleUrl) {
      objectStack[objectStack.length - 1] = styleUrl;
    }
    var Style = /** @type {ol.style.Style} */
        (pairObject['Style']);
    if (Style) {
      objectStack[objectStack.length - 1] = Style;
    }
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.KML.PlacemarkStyleMapParser_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'StyleMap',
      'localName should be StyleMap');
  var styleMapValue = ol.format.KML.readStyleMapValue_(node, objectStack);
  if (!styleMapValue) {
    return;
  }
  var placemarkObject = objectStack[objectStack.length - 1];
  if (Array.isArray(styleMapValue)) {
    placemarkObject['Style'] = styleMapValue;
  } else if (typeof styleMapValue === 'string') {
    placemarkObject['styleUrl'] = styleMapValue;
  } else {
    ol.asserts.assert(false, 38); // `styleMapValue` has an unknown type
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.KML.SchemaDataParser_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'SchemaData',
      'localName should be SchemaData');
  ol.xml.parseNode(ol.format.KML.SCHEMA_DATA_PARSERS_, node, objectStack);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.KML.SimpleDataParser_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'SimpleData',
      'localName should be SimpleData');
  var name = node.getAttribute('name');
  if (name !== null) {
    var data = ol.format.XSD.readString(node);
    var featureObject =
        /** @type {Object} */ (objectStack[objectStack.length - 1]);
    featureObject[name] = data;
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.KML.innerBoundaryIsParser_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'innerBoundaryIs',
      'localName should be innerBoundaryIs');
  /** @type {Array.<number>|undefined} */
  var flatLinearRing = ol.xml.pushParseAndPop(undefined,
      ol.format.KML.INNER_BOUNDARY_IS_PARSERS_, node, objectStack);
  if (flatLinearRing) {
    var flatLinearRings = /** @type {Array.<Array.<number>>} */
        (objectStack[objectStack.length - 1]);
    goog.DEBUG && console.assert(Array.isArray(flatLinearRings),
        'flatLinearRings should be an array');
    goog.DEBUG && console.assert(flatLinearRings.length > 0,
        'flatLinearRings array should not be empty');
    flatLinearRings.push(flatLinearRing);
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.KML.outerBoundaryIsParser_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'outerBoundaryIs',
      'localName should be outerBoundaryIs');
  /** @type {Array.<number>|undefined} */
  var flatLinearRing = ol.xml.pushParseAndPop(undefined,
      ol.format.KML.OUTER_BOUNDARY_IS_PARSERS_, node, objectStack);
  if (flatLinearRing) {
    var flatLinearRings = /** @type {Array.<Array.<number>>} */
        (objectStack[objectStack.length - 1]);
    goog.DEBUG && console.assert(Array.isArray(flatLinearRings),
        'flatLinearRings should be an array');
    goog.DEBUG && console.assert(flatLinearRings.length > 0,
        'flatLinearRings array should not be empty');
    flatLinearRings[0] = flatLinearRing;
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.KML.LinkParser_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Link', 'localName should be Link');
  ol.xml.parseNode(ol.format.KML.LINK_PARSERS_, node, objectStack);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.KML.whenParser_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'when', 'localName should be when');
  var gxTrackObject = /** @type {ol.KMLGxTrackObject_} */
      (objectStack[objectStack.length - 1]);
  var whens = gxTrackObject.whens;
  var s = ol.xml.getAllTextContent(node, false);
  var when = Date.parse(s);
  whens.push(isNaN(when) ? 0 : when);
};


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.KML.DATA_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'value': ol.xml.makeReplacer(ol.format.XSD.readString)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.KML.EXTENDED_DATA_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'Data': ol.format.KML.DataParser_,
      'SchemaData': ol.format.KML.SchemaDataParser_
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.KML.EXTRUDE_AND_ALTITUDE_MODE_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'extrude': ol.xml.makeObjectPropertySetter(ol.format.XSD.readBoolean),
      'altitudeMode': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.KML.FLAT_LINEAR_RING_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'coordinates': ol.xml.makeReplacer(ol.format.KML.readFlatCoordinates_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.KML.FLAT_LINEAR_RINGS_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'innerBoundaryIs': ol.format.KML.innerBoundaryIsParser_,
      'outerBoundaryIs': ol.format.KML.outerBoundaryIsParser_
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.KML.GX_TRACK_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'when': ol.format.KML.whenParser_
    }, ol.xml.makeStructureNS(
        ol.format.KML.GX_NAMESPACE_URIS_, {
          'coord': ol.format.KML.gxCoordParser_
        }));


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.KML.GEOMETRY_FLAT_COORDINATES_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'coordinates': ol.xml.makeReplacer(ol.format.KML.readFlatCoordinates_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.KML.ICON_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'href': ol.xml.makeObjectPropertySetter(ol.format.KML.readURI_)
    }, ol.xml.makeStructureNS(
        ol.format.KML.GX_NAMESPACE_URIS_, {
          'x': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDecimal),
          'y': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDecimal),
          'w': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDecimal),
          'h': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDecimal)
        }));


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.KML.ICON_STYLE_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'Icon': ol.xml.makeObjectPropertySetter(ol.format.KML.readIcon_),
      'heading': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDecimal),
      'hotSpot': ol.xml.makeObjectPropertySetter(ol.format.KML.readVec2_),
      'scale': ol.xml.makeObjectPropertySetter(ol.format.KML.readScale_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.KML.INNER_BOUNDARY_IS_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'LinearRing': ol.xml.makeReplacer(ol.format.KML.readFlatLinearRing_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.KML.LABEL_STYLE_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'color': ol.xml.makeObjectPropertySetter(ol.format.KML.readColor_),
      'scale': ol.xml.makeObjectPropertySetter(ol.format.KML.readScale_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.KML.LINE_STYLE_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'color': ol.xml.makeObjectPropertySetter(ol.format.KML.readColor_),
      'width': ol.xml.makeObjectPropertySetter(ol.format.XSD.readDecimal)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.KML.MULTI_GEOMETRY_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'LineString': ol.xml.makeArrayPusher(ol.format.KML.readLineString_),
      'LinearRing': ol.xml.makeArrayPusher(ol.format.KML.readLinearRing_),
      'MultiGeometry': ol.xml.makeArrayPusher(ol.format.KML.readMultiGeometry_),
      'Point': ol.xml.makeArrayPusher(ol.format.KML.readPoint_),
      'Polygon': ol.xml.makeArrayPusher(ol.format.KML.readPolygon_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.KML.GX_MULTITRACK_GEOMETRY_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.KML.GX_NAMESPACE_URIS_, {
      'Track': ol.xml.makeArrayPusher(ol.format.KML.readGxTrack_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.KML.NETWORK_LINK_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'ExtendedData': ol.format.KML.ExtendedDataParser_,
      'Link': ol.format.KML.LinkParser_,
      'address': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'description': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'name': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'open': ol.xml.makeObjectPropertySetter(ol.format.XSD.readBoolean),
      'phoneNumber': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'visibility': ol.xml.makeObjectPropertySetter(ol.format.XSD.readBoolean)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.KML.LINK_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'href': ol.xml.makeObjectPropertySetter(ol.format.KML.readURI_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.KML.OUTER_BOUNDARY_IS_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'LinearRing': ol.xml.makeReplacer(ol.format.KML.readFlatLinearRing_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.KML.PAIR_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'Style': ol.xml.makeObjectPropertySetter(ol.format.KML.readStyle_),
      'key': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'styleUrl': ol.xml.makeObjectPropertySetter(ol.format.KML.readURI_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.KML.PLACEMARK_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'ExtendedData': ol.format.KML.ExtendedDataParser_,
      'MultiGeometry': ol.xml.makeObjectPropertySetter(
          ol.format.KML.readMultiGeometry_, 'geometry'),
      'LineString': ol.xml.makeObjectPropertySetter(
          ol.format.KML.readLineString_, 'geometry'),
      'LinearRing': ol.xml.makeObjectPropertySetter(
          ol.format.KML.readLinearRing_, 'geometry'),
      'Point': ol.xml.makeObjectPropertySetter(
          ol.format.KML.readPoint_, 'geometry'),
      'Polygon': ol.xml.makeObjectPropertySetter(
          ol.format.KML.readPolygon_, 'geometry'),
      'Style': ol.xml.makeObjectPropertySetter(ol.format.KML.readStyle_),
      'StyleMap': ol.format.KML.PlacemarkStyleMapParser_,
      'address': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'description': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'name': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'open': ol.xml.makeObjectPropertySetter(ol.format.XSD.readBoolean),
      'phoneNumber': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'styleUrl': ol.xml.makeObjectPropertySetter(ol.format.KML.readURI_),
      'visibility': ol.xml.makeObjectPropertySetter(ol.format.XSD.readBoolean)
    }, ol.xml.makeStructureNS(
        ol.format.KML.GX_NAMESPACE_URIS_, {
          'MultiTrack': ol.xml.makeObjectPropertySetter(
              ol.format.KML.readGxMultiTrack_, 'geometry'),
          'Track': ol.xml.makeObjectPropertySetter(
              ol.format.KML.readGxTrack_, 'geometry')
        }
    ));


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.KML.POLY_STYLE_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'color': ol.xml.makeObjectPropertySetter(ol.format.KML.readColor_),
      'fill': ol.xml.makeObjectPropertySetter(ol.format.XSD.readBoolean),
      'outline': ol.xml.makeObjectPropertySetter(ol.format.XSD.readBoolean)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.KML.SCHEMA_DATA_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'SimpleData': ol.format.KML.SimpleDataParser_
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.KML.STYLE_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'IconStyle': ol.format.KML.IconStyleParser_,
      'LabelStyle': ol.format.KML.LabelStyleParser_,
      'LineStyle': ol.format.KML.LineStyleParser_,
      'PolyStyle': ol.format.KML.PolyStyleParser_
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.KML.STYLE_MAP_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'Pair': ol.format.KML.PairDataParser_
    });


/**
 * @inheritDoc
 */
ol.format.KML.prototype.getExtensions = function() {
  return ol.format.KML.EXTENSIONS_;
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Array.<ol.Feature>|undefined} Features.
 */
ol.format.KML.prototype.readDocumentOrFolder_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  var localName = node.localName;
  goog.DEBUG && console.assert(localName == 'Document' || localName == 'Folder',
      'localName should be Document or Folder');
  // FIXME use scope somehow
  var parsersNS = ol.xml.makeStructureNS(
      ol.format.KML.NAMESPACE_URIS_, {
        'Document': ol.xml.makeArrayExtender(this.readDocumentOrFolder_, this),
        'Folder': ol.xml.makeArrayExtender(this.readDocumentOrFolder_, this),
        'Placemark': ol.xml.makeArrayPusher(this.readPlacemark_, this),
        'Style': this.readSharedStyle_.bind(this),
        'StyleMap': this.readSharedStyleMap_.bind(this)
      });
  /** @type {Array.<ol.Feature>} */
  var features = ol.xml.pushParseAndPop([], parsersNS, node, objectStack, this);
  if (features) {
    return features;
  } else {
    return undefined;
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {ol.Feature|undefined} Feature.
 */
ol.format.KML.prototype.readPlacemark_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Placemark',
      'localName should be Placemark');
  var object = ol.xml.pushParseAndPop({'geometry': null},
      ol.format.KML.PLACEMARK_PARSERS_, node, objectStack);
  if (!object) {
    return undefined;
  }
  var feature = new ol.Feature();
  var id = node.getAttribute('id');
  if (id !== null) {
    feature.setId(id);
  }
  var options = /** @type {olx.format.ReadOptions} */ (objectStack[0]);

  var geometry = object['geometry'];
  if (geometry) {
    ol.format.Feature.transformWithOptions(geometry, false, options);
  }
  feature.setGeometry(geometry);
  delete object['geometry'];

  if (this.extractStyles_) {
    var style = object['Style'];
    var styleUrl = object['styleUrl'];
    var styleFunction = ol.format.KML.createFeatureStyleFunction_(
        style, styleUrl, this.defaultStyle_, this.sharedStyles_,
        this.showPointNames_);
    feature.setStyle(styleFunction);
  }
  delete object['Style'];
  // we do not remove the styleUrl property from the object, so it
  // gets stored on feature when setProperties is called

  feature.setProperties(object);

  return feature;
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.KML.prototype.readSharedStyle_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Style', 'localName should be Style');
  var id = node.getAttribute('id');
  if (id !== null) {
    var style = ol.format.KML.readStyle_(node, objectStack);
    if (style) {
      var styleUri;
      if (node.baseURI) {
        var url = new URL('#' + id, node.baseURI);
        styleUri = url.href;
      } else {
        styleUri = '#' + id;
      }
      this.sharedStyles_[styleUri] = style;
    }
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.KML.prototype.readSharedStyleMap_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'StyleMap',
      'localName should be StyleMap');
  var id = node.getAttribute('id');
  if (id === null) {
    return;
  }
  var styleMapValue = ol.format.KML.readStyleMapValue_(node, objectStack);
  if (!styleMapValue) {
    return;
  }
  var styleUri;
  if (node.baseURI) {
    var url = new URL('#' + id, node.baseURI);
    styleUri = url.href;
  } else {
    styleUri = '#' + id;
  }
  this.sharedStyles_[styleUri] = styleMapValue;
};


/**
 * Read the first feature from a KML source. MultiGeometries are converted into
 * GeometryCollections if they are a mix of geometry types, and into MultiPoint/
 * MultiLineString/MultiPolygon if they are all of the same type.
 *
 * @function
 * @param {Document|Node|Object|string} source Source.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @return {ol.Feature} Feature.
 * @api stable
 */
ol.format.KML.prototype.readFeature;


/**
 * @inheritDoc
 */
ol.format.KML.prototype.readFeatureFromNode = function(node, opt_options) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  if (!ol.array.includes(ol.format.KML.NAMESPACE_URIS_, node.namespaceURI)) {
    return null;
  }
  goog.DEBUG && console.assert(node.localName == 'Placemark',
      'localName should be Placemark');
  var feature = this.readPlacemark_(
      node, [this.getReadOptions(node, opt_options)]);
  if (feature) {
    return feature;
  } else {
    return null;
  }
};


/**
 * Read all features from a KML source. MultiGeometries are converted into
 * GeometryCollections if they are a mix of geometry types, and into MultiPoint/
 * MultiLineString/MultiPolygon if they are all of the same type.
 *
 * @function
 * @param {Document|Node|Object|string} source Source.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @return {Array.<ol.Feature>} Features.
 * @api stable
 */
ol.format.KML.prototype.readFeatures;


/**
 * @inheritDoc
 */
ol.format.KML.prototype.readFeaturesFromNode = function(node, opt_options) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  if (!ol.array.includes(ol.format.KML.NAMESPACE_URIS_, node.namespaceURI)) {
    return [];
  }
  var features;
  var localName = node.localName;
  if (localName == 'Document' || localName == 'Folder') {
    features = this.readDocumentOrFolder_(
        node, [this.getReadOptions(node, opt_options)]);
    if (features) {
      return features;
    } else {
      return [];
    }
  } else if (localName == 'Placemark') {
    var feature = this.readPlacemark_(
        node, [this.getReadOptions(node, opt_options)]);
    if (feature) {
      return [feature];
    } else {
      return [];
    }
  } else if (localName == 'kml') {
    features = [];
    var n;
    for (n = node.firstElementChild; n; n = n.nextElementSibling) {
      var fs = this.readFeaturesFromNode(n, opt_options);
      if (fs) {
        ol.array.extend(features, fs);
      }
    }
    return features;
  } else {
    return [];
  }
};


/**
 * Read the name of the KML.
 *
 * @param {Document|Node|string} source Souce.
 * @return {string|undefined} Name.
 * @api stable
 */
ol.format.KML.prototype.readName = function(source) {
  if (ol.xml.isDocument(source)) {
    return this.readNameFromDocument(/** @type {Document} */ (source));
  } else if (ol.xml.isNode(source)) {
    return this.readNameFromNode(/** @type {Node} */ (source));
  } else if (typeof source === 'string') {
    var doc = ol.xml.parse(source);
    return this.readNameFromDocument(doc);
  } else {
    return undefined;
  }
};


/**
 * @param {Document} doc Document.
 * @return {string|undefined} Name.
 */
ol.format.KML.prototype.readNameFromDocument = function(doc) {
  var n;
  for (n = doc.firstChild; n; n = n.nextSibling) {
    if (n.nodeType == Node.ELEMENT_NODE) {
      var name = this.readNameFromNode(n);
      if (name) {
        return name;
      }
    }
  }
  return undefined;
};


/**
 * @param {Node} node Node.
 * @return {string|undefined} Name.
 */
ol.format.KML.prototype.readNameFromNode = function(node) {
  var n;
  for (n = node.firstElementChild; n; n = n.nextElementSibling) {
    if (ol.array.includes(ol.format.KML.NAMESPACE_URIS_, n.namespaceURI) &&
        n.localName == 'name') {
      return ol.format.XSD.readString(n);
    }
  }
  for (n = node.firstElementChild; n; n = n.nextElementSibling) {
    var localName = n.localName;
    if (ol.array.includes(ol.format.KML.NAMESPACE_URIS_, n.namespaceURI) &&
        (localName == 'Document' ||
         localName == 'Folder' ||
         localName == 'Placemark' ||
         localName == 'kml')) {
      var name = this.readNameFromNode(n);
      if (name) {
        return name;
      }
    }
  }
  return undefined;
};


/**
 * Read the network links of the KML.
 *
 * @param {Document|Node|string} source Source.
 * @return {Array.<Object>} Network links.
 * @api
 */
ol.format.KML.prototype.readNetworkLinks = function(source) {
  var networkLinks = [];
  if (ol.xml.isDocument(source)) {
    ol.array.extend(networkLinks, this.readNetworkLinksFromDocument(
        /** @type {Document} */ (source)));
  } else if (ol.xml.isNode(source)) {
    ol.array.extend(networkLinks, this.readNetworkLinksFromNode(
        /** @type {Node} */ (source)));
  } else if (typeof source === 'string') {
    var doc = ol.xml.parse(source);
    ol.array.extend(networkLinks, this.readNetworkLinksFromDocument(doc));
  }
  return networkLinks;
};


/**
 * @param {Document} doc Document.
 * @return {Array.<Object>} Network links.
 */
ol.format.KML.prototype.readNetworkLinksFromDocument = function(doc) {
  var n, networkLinks = [];
  for (n = doc.firstChild; n; n = n.nextSibling) {
    if (n.nodeType == Node.ELEMENT_NODE) {
      ol.array.extend(networkLinks, this.readNetworkLinksFromNode(n));
    }
  }
  return networkLinks;
};


/**
 * @param {Node} node Node.
 * @return {Array.<Object>} Network links.
 */
ol.format.KML.prototype.readNetworkLinksFromNode = function(node) {
  var n, networkLinks = [];
  for (n = node.firstElementChild; n; n = n.nextElementSibling) {
    if (ol.array.includes(ol.format.KML.NAMESPACE_URIS_, n.namespaceURI) &&
        n.localName == 'NetworkLink') {
      var obj = ol.xml.pushParseAndPop({}, ol.format.KML.NETWORK_LINK_PARSERS_,
          n, []);
      networkLinks.push(obj);
    }
  }
  for (n = node.firstElementChild; n; n = n.nextElementSibling) {
    var localName = n.localName;
    if (ol.array.includes(ol.format.KML.NAMESPACE_URIS_, n.namespaceURI) &&
        (localName == 'Document' ||
         localName == 'Folder' ||
         localName == 'kml')) {
      ol.array.extend(networkLinks, this.readNetworkLinksFromNode(n));
    }
  }
  return networkLinks;
};


/**
 * Read the projection from a KML source.
 *
 * @function
 * @param {Document|Node|Object|string} source Source.
 * @return {ol.proj.Projection} Projection.
 * @api stable
 */
ol.format.KML.prototype.readProjection;


/**
 * @param {Node} node Node to append a TextNode with the color to.
 * @param {ol.Color|string} color Color.
 * @private
 */
ol.format.KML.writeColorTextNode_ = function(node, color) {
  var rgba = ol.color.asArray(color);
  var opacity = (rgba.length == 4) ? rgba[3] : 1;
  var abgr = [opacity * 255, rgba[2], rgba[1], rgba[0]];
  var i;
  for (i = 0; i < 4; ++i) {
    var hex = parseInt(abgr[i], 10).toString(16);
    abgr[i] = (hex.length == 1) ? '0' + hex : hex;
  }
  ol.format.XSD.writeStringTextNode(node, abgr.join(''));
};


/**
 * @param {Node} node Node to append a TextNode with the coordinates to.
 * @param {Array.<number>} coordinates Coordinates.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.KML.writeCoordinatesTextNode_ = function(node, coordinates, objectStack) {
  var context = objectStack[objectStack.length - 1];

  var layout = context['layout'];
  var stride = context['stride'];

  var dimension;
  if (layout == ol.geom.GeometryLayout.XY ||
      layout == ol.geom.GeometryLayout.XYM) {
    dimension = 2;
  } else if (layout == ol.geom.GeometryLayout.XYZ ||
      layout == ol.geom.GeometryLayout.XYZM) {
    dimension = 3;
  } else {
    ol.asserts.assert(false, 34); // Invalid geometry layout
  }

  var d, i;
  var ii = coordinates.length;
  var text = '';
  if (ii > 0) {
    text += coordinates[0];
    for (d = 1; d < dimension; ++d) {
      text += ',' + coordinates[d];
    }
    for (i = stride; i < ii; i += stride) {
      text += ' ' + coordinates[i];
      for (d = 1; d < dimension; ++d) {
        text += ',' + coordinates[i + d];
      }
    }
  }
  ol.format.XSD.writeStringTextNode(node, text);
};


/**
 * @param {Node} node Node.
 * @param {Array.<ol.Feature>} features Features.
 * @param {Array.<*>} objectStack Object stack.
 * @this {ol.format.KML}
 * @private
 */
ol.format.KML.writeDocument_ = function(node, features, objectStack) {
  var /** @type {ol.XmlNodeStackItem} */ context = {node: node};
  ol.xml.pushSerializeAndPop(context, ol.format.KML.DOCUMENT_SERIALIZERS_,
      ol.format.KML.DOCUMENT_NODE_FACTORY_, features, objectStack, undefined,
      this);
};


/**
 * @param {Node} node Node.
 * @param {Object} icon Icon object.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.KML.writeIcon_ = function(node, icon, objectStack) {
  var /** @type {ol.XmlNodeStackItem} */ context = {node: node};
  var parentNode = objectStack[objectStack.length - 1].node;
  var orderedKeys = ol.format.KML.ICON_SEQUENCE_[parentNode.namespaceURI];
  var values = ol.xml.makeSequence(icon, orderedKeys);
  ol.xml.pushSerializeAndPop(context,
      ol.format.KML.ICON_SERIALIZERS_, ol.xml.OBJECT_PROPERTY_NODE_FACTORY,
      values, objectStack, orderedKeys);
  orderedKeys =
      ol.format.KML.ICON_SEQUENCE_[ol.format.KML.GX_NAMESPACE_URIS_[0]];
  values = ol.xml.makeSequence(icon, orderedKeys);
  ol.xml.pushSerializeAndPop(context, ol.format.KML.ICON_SERIALIZERS_,
      ol.format.KML.GX_NODE_FACTORY_, values, objectStack, orderedKeys);
};


/**
 * @param {Node} node Node.
 * @param {ol.style.Icon} style Icon style.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.KML.writeIconStyle_ = function(node, style, objectStack) {
  var /** @type {ol.XmlNodeStackItem} */ context = {node: node};
  var properties = {};
  var src = style.getSrc();
  var size = style.getSize();
  var iconImageSize = style.getImageSize();
  var iconProperties = {
    'href': src
  };

  if (size) {
    iconProperties['w'] = size[0];
    iconProperties['h'] = size[1];
    var anchor = style.getAnchor(); // top-left
    var origin = style.getOrigin(); // top-left

    if (origin && iconImageSize && origin[0] !== 0 && origin[1] !== size[1]) {
      iconProperties['x'] = origin[0];
      iconProperties['y'] = iconImageSize[1] - (origin[1] + size[1]);
    }

    if (anchor && anchor[0] !== 0 && anchor[1] !== size[1]) {
      var /** @type {ol.KMLVec2_} */ hotSpot = {
        x: anchor[0],
        xunits: ol.style.IconAnchorUnits.PIXELS,
        y: size[1] - anchor[1],
        yunits: ol.style.IconAnchorUnits.PIXELS
      };
      properties['hotSpot'] = hotSpot;
    }
  }

  properties['Icon'] = iconProperties;

  var scale = style.getScale();
  if (scale !== 1) {
    properties['scale'] = scale;
  }

  var rotation = style.getRotation();
  if (rotation !== 0) {
    properties['heading'] = rotation; // 0-360
  }

  var parentNode = objectStack[objectStack.length - 1].node;
  var orderedKeys = ol.format.KML.ICON_STYLE_SEQUENCE_[parentNode.namespaceURI];
  var values = ol.xml.makeSequence(properties, orderedKeys);
  ol.xml.pushSerializeAndPop(context, ol.format.KML.ICON_STYLE_SERIALIZERS_,
      ol.xml.OBJECT_PROPERTY_NODE_FACTORY, values, objectStack, orderedKeys);
};


/**
 * @param {Node} node Node.
 * @param {ol.style.Text} style style.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.KML.writeLabelStyle_ = function(node, style, objectStack) {
  var /** @type {ol.XmlNodeStackItem} */ context = {node: node};
  var properties = {};
  var fill = style.getFill();
  if (fill) {
    properties['color'] = fill.getColor();
  }
  var scale = style.getScale();
  if (scale && scale !== 1) {
    properties['scale'] = scale;
  }
  var parentNode = objectStack[objectStack.length - 1].node;
  var orderedKeys =
      ol.format.KML.LABEL_STYLE_SEQUENCE_[parentNode.namespaceURI];
  var values = ol.xml.makeSequence(properties, orderedKeys);
  ol.xml.pushSerializeAndPop(context, ol.format.KML.LABEL_STYLE_SERIALIZERS_,
      ol.xml.OBJECT_PROPERTY_NODE_FACTORY, values, objectStack, orderedKeys);
};


/**
 * @param {Node} node Node.
 * @param {ol.style.Stroke} style style.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.KML.writeLineStyle_ = function(node, style, objectStack) {
  var /** @type {ol.XmlNodeStackItem} */ context = {node: node};
  var properties = {
    'color': style.getColor(),
    'width': style.getWidth()
  };
  var parentNode = objectStack[objectStack.length - 1].node;
  var orderedKeys = ol.format.KML.LINE_STYLE_SEQUENCE_[parentNode.namespaceURI];
  var values = ol.xml.makeSequence(properties, orderedKeys);
  ol.xml.pushSerializeAndPop(context, ol.format.KML.LINE_STYLE_SERIALIZERS_,
      ol.xml.OBJECT_PROPERTY_NODE_FACTORY, values, objectStack, orderedKeys);
};


/**
 * @param {Node} node Node.
 * @param {ol.geom.Geometry} geometry Geometry.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.KML.writeMultiGeometry_ = function(node, geometry, objectStack) {
  /** @type {ol.XmlNodeStackItem} */
  var context = {node: node};
  var type = geometry.getType();
  /** @type {Array.<ol.geom.Geometry>} */
  var geometries;
  /** @type {function(*, Array.<*>, string=): (Node|undefined)} */
  var factory;
  if (type == ol.geom.GeometryType.GEOMETRY_COLLECTION) {
    geometries = /** @type {ol.geom.GeometryCollection} */ (geometry).getGeometries();
    factory = ol.format.KML.GEOMETRY_NODE_FACTORY_;
  } else if (type == ol.geom.GeometryType.MULTI_POINT) {
    geometries = /** @type {ol.geom.MultiPoint} */ (geometry).getPoints();
    factory = ol.format.KML.POINT_NODE_FACTORY_;
  } else if (type == ol.geom.GeometryType.MULTI_LINE_STRING) {
    geometries =
        (/** @type {ol.geom.MultiLineString} */ (geometry)).getLineStrings();
    factory = ol.format.KML.LINE_STRING_NODE_FACTORY_;
  } else if (type == ol.geom.GeometryType.MULTI_POLYGON) {
    geometries =
        (/** @type {ol.geom.MultiPolygon} */ (geometry)).getPolygons();
    factory = ol.format.KML.POLYGON_NODE_FACTORY_;
  } else {
    ol.asserts.assert(false, 39); // Unknown geometry type
  }
  ol.xml.pushSerializeAndPop(context,
      ol.format.KML.MULTI_GEOMETRY_SERIALIZERS_, factory,
      geometries, objectStack);
};


/**
 * @param {Node} node Node.
 * @param {ol.geom.LinearRing} linearRing Linear ring.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.KML.writeBoundaryIs_ = function(node, linearRing, objectStack) {
  var /** @type {ol.XmlNodeStackItem} */ context = {node: node};
  ol.xml.pushSerializeAndPop(context,
      ol.format.KML.BOUNDARY_IS_SERIALIZERS_,
      ol.format.KML.LINEAR_RING_NODE_FACTORY_, [linearRing], objectStack);
};


/**
 * FIXME currently we do serialize arbitrary/custom feature properties
 * (ExtendedData).
 * @param {Node} node Node.
 * @param {ol.Feature} feature Feature.
 * @param {Array.<*>} objectStack Object stack.
 * @this {ol.format.KML}
 * @private
 */
ol.format.KML.writePlacemark_ = function(node, feature, objectStack) {
  var /** @type {ol.XmlNodeStackItem} */ context = {node: node};

  // set id
  if (feature.getId()) {
    node.setAttribute('id', feature.getId());
  }

  // serialize properties (properties unknown to KML are not serialized)
  var properties = feature.getProperties();

  var styleFunction = feature.getStyleFunction();
  if (styleFunction) {
    // FIXME the styles returned by the style function are supposed to be
    // resolution-independent here
    var styles = styleFunction.call(feature, 0);
    if (styles) {
      var style = Array.isArray(styles) ? styles[0] : styles;
      if (this.writeStyles_) {
        properties['Style'] = style;
      }
      var textStyle = style.getText();
      if (textStyle) {
        properties['name'] = textStyle.getText();
      }
    }
  }
  var parentNode = objectStack[objectStack.length - 1].node;
  var orderedKeys = ol.format.KML.PLACEMARK_SEQUENCE_[parentNode.namespaceURI];
  var values = ol.xml.makeSequence(properties, orderedKeys);
  ol.xml.pushSerializeAndPop(context, ol.format.KML.PLACEMARK_SERIALIZERS_,
      ol.xml.OBJECT_PROPERTY_NODE_FACTORY, values, objectStack, orderedKeys);

  // serialize geometry
  var options = /** @type {olx.format.WriteOptions} */ (objectStack[0]);
  var geometry = feature.getGeometry();
  if (geometry) {
    geometry =
        ol.format.Feature.transformWithOptions(geometry, true, options);
  }
  ol.xml.pushSerializeAndPop(context, ol.format.KML.PLACEMARK_SERIALIZERS_,
      ol.format.KML.GEOMETRY_NODE_FACTORY_, [geometry], objectStack);
};


/**
 * @param {Node} node Node.
 * @param {ol.geom.SimpleGeometry} geometry Geometry.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.KML.writePrimitiveGeometry_ = function(node, geometry, objectStack) {
  goog.DEBUG && console.assert(
      (geometry instanceof ol.geom.Point) ||
      (geometry instanceof ol.geom.LineString) ||
      (geometry instanceof ol.geom.LinearRing),
      'geometry should be one of ol.geom.Point, ol.geom.LineString ' +
      'or ol.geom.LinearRing');
  var flatCoordinates = geometry.getFlatCoordinates();
  var /** @type {ol.XmlNodeStackItem} */ context = {node: node};
  context['layout'] = geometry.getLayout();
  context['stride'] = geometry.getStride();
  ol.xml.pushSerializeAndPop(context,
      ol.format.KML.PRIMITIVE_GEOMETRY_SERIALIZERS_,
      ol.format.KML.COORDINATES_NODE_FACTORY_,
      [flatCoordinates], objectStack);
};


/**
 * @param {Node} node Node.
 * @param {ol.geom.Polygon} polygon Polygon.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.KML.writePolygon_ = function(node, polygon, objectStack) {
  var linearRings = polygon.getLinearRings();
  goog.DEBUG && console.assert(linearRings.length > 0,
      'linearRings should not be empty');
  var outerRing = linearRings.shift();
  var /** @type {ol.XmlNodeStackItem} */ context = {node: node};
  // inner rings
  ol.xml.pushSerializeAndPop(context,
      ol.format.KML.POLYGON_SERIALIZERS_,
      ol.format.KML.INNER_BOUNDARY_NODE_FACTORY_,
      linearRings, objectStack);
  // outer ring
  ol.xml.pushSerializeAndPop(context,
      ol.format.KML.POLYGON_SERIALIZERS_,
      ol.format.KML.OUTER_BOUNDARY_NODE_FACTORY_,
      [outerRing], objectStack);
};


/**
 * @param {Node} node Node.
 * @param {ol.style.Fill} style Style.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.KML.writePolyStyle_ = function(node, style, objectStack) {
  var /** @type {ol.XmlNodeStackItem} */ context = {node: node};
  ol.xml.pushSerializeAndPop(context, ol.format.KML.POLY_STYLE_SERIALIZERS_,
      ol.format.KML.COLOR_NODE_FACTORY_, [style.getColor()], objectStack);
};


/**
 * @param {Node} node Node to append a TextNode with the scale to.
 * @param {number|undefined} scale Scale.
 * @private
 */
ol.format.KML.writeScaleTextNode_ = function(node, scale) {
  // the Math is to remove any excess decimals created by float arithmetic
  ol.format.XSD.writeDecimalTextNode(node,
      Math.round(scale * scale * 1e6) / 1e6);
};


/**
 * @param {Node} node Node.
 * @param {ol.style.Style} style Style.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.KML.writeStyle_ = function(node, style, objectStack) {
  var /** @type {ol.XmlNodeStackItem} */ context = {node: node};
  var properties = {};
  var fillStyle = style.getFill();
  var strokeStyle = style.getStroke();
  var imageStyle = style.getImage();
  var textStyle = style.getText();
  if (imageStyle instanceof ol.style.Icon) {
    properties['IconStyle'] = imageStyle;
  }
  if (textStyle) {
    properties['LabelStyle'] = textStyle;
  }
  if (strokeStyle) {
    properties['LineStyle'] = strokeStyle;
  }
  if (fillStyle) {
    properties['PolyStyle'] = fillStyle;
  }
  var parentNode = objectStack[objectStack.length - 1].node;
  var orderedKeys = ol.format.KML.STYLE_SEQUENCE_[parentNode.namespaceURI];
  var values = ol.xml.makeSequence(properties, orderedKeys);
  ol.xml.pushSerializeAndPop(context, ol.format.KML.STYLE_SERIALIZERS_,
      ol.xml.OBJECT_PROPERTY_NODE_FACTORY, values, objectStack, orderedKeys);
};


/**
 * @param {Node} node Node to append a TextNode with the Vec2 to.
 * @param {ol.KMLVec2_} vec2 Vec2.
 * @private
 */
ol.format.KML.writeVec2_ = function(node, vec2) {
  node.setAttribute('x', vec2.x);
  node.setAttribute('y', vec2.y);
  node.setAttribute('xunits', vec2.xunits);
  node.setAttribute('yunits', vec2.yunits);
};


/**
 * @const
 * @type {Object.<string, Array.<string>>}
 * @private
 */
ol.format.KML.KML_SEQUENCE_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, [
      'Document', 'Placemark'
    ]);


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlSerializer>>}
 * @private
 */
ol.format.KML.KML_SERIALIZERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'Document': ol.xml.makeChildAppender(ol.format.KML.writeDocument_),
      'Placemark': ol.xml.makeChildAppender(ol.format.KML.writePlacemark_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlSerializer>>}
 * @private
 */
ol.format.KML.DOCUMENT_SERIALIZERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'Placemark': ol.xml.makeChildAppender(ol.format.KML.writePlacemark_)
    });


/**
 * @const
 * @type {Object.<string, string>}
 * @private
 */
ol.format.KML.GEOMETRY_TYPE_TO_NODENAME_ = {
  'Point': 'Point',
  'LineString': 'LineString',
  'LinearRing': 'LinearRing',
  'Polygon': 'Polygon',
  'MultiPoint': 'MultiGeometry',
  'MultiLineString': 'MultiGeometry',
  'MultiPolygon': 'MultiGeometry',
  'GeometryCollection': 'MultiGeometry'
};


/**
 * @const
 * @type {Object.<string, Array.<string>>}
 * @private
 */
ol.format.KML.ICON_SEQUENCE_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, [
      'href'
    ],
    ol.xml.makeStructureNS(ol.format.KML.GX_NAMESPACE_URIS_, [
      'x', 'y', 'w', 'h'
    ]));


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlSerializer>>}
 * @private
 */
ol.format.KML.ICON_SERIALIZERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'href': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode)
    }, ol.xml.makeStructureNS(
        ol.format.KML.GX_NAMESPACE_URIS_, {
          'x': ol.xml.makeChildAppender(ol.format.XSD.writeDecimalTextNode),
          'y': ol.xml.makeChildAppender(ol.format.XSD.writeDecimalTextNode),
          'w': ol.xml.makeChildAppender(ol.format.XSD.writeDecimalTextNode),
          'h': ol.xml.makeChildAppender(ol.format.XSD.writeDecimalTextNode)
        }));


/**
 * @const
 * @type {Object.<string, Array.<string>>}
 * @private
 */
ol.format.KML.ICON_STYLE_SEQUENCE_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, [
      'scale', 'heading', 'Icon', 'hotSpot'
    ]);


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlSerializer>>}
 * @private
 */
ol.format.KML.ICON_STYLE_SERIALIZERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'Icon': ol.xml.makeChildAppender(ol.format.KML.writeIcon_),
      'heading': ol.xml.makeChildAppender(ol.format.XSD.writeDecimalTextNode),
      'hotSpot': ol.xml.makeChildAppender(ol.format.KML.writeVec2_),
      'scale': ol.xml.makeChildAppender(ol.format.KML.writeScaleTextNode_)
    });


/**
 * @const
 * @type {Object.<string, Array.<string>>}
 * @private
 */
ol.format.KML.LABEL_STYLE_SEQUENCE_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, [
      'color', 'scale'
    ]);


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlSerializer>>}
 * @private
 */
ol.format.KML.LABEL_STYLE_SERIALIZERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'color': ol.xml.makeChildAppender(ol.format.KML.writeColorTextNode_),
      'scale': ol.xml.makeChildAppender(ol.format.KML.writeScaleTextNode_)
    });


/**
 * @const
 * @type {Object.<string, Array.<string>>}
 * @private
 */
ol.format.KML.LINE_STYLE_SEQUENCE_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, [
      'color', 'width'
    ]);


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlSerializer>>}
 * @private
 */
ol.format.KML.LINE_STYLE_SERIALIZERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'color': ol.xml.makeChildAppender(ol.format.KML.writeColorTextNode_),
      'width': ol.xml.makeChildAppender(ol.format.XSD.writeDecimalTextNode)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlSerializer>>}
 * @private
 */
ol.format.KML.BOUNDARY_IS_SERIALIZERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'LinearRing': ol.xml.makeChildAppender(
          ol.format.KML.writePrimitiveGeometry_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlSerializer>>}
 * @private
 */
ol.format.KML.MULTI_GEOMETRY_SERIALIZERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'LineString': ol.xml.makeChildAppender(
          ol.format.KML.writePrimitiveGeometry_),
      'Point': ol.xml.makeChildAppender(
          ol.format.KML.writePrimitiveGeometry_),
      'Polygon': ol.xml.makeChildAppender(ol.format.KML.writePolygon_),
      'GeometryCollection': ol.xml.makeChildAppender(
          ol.format.KML.writeMultiGeometry_)
    });


/**
 * @const
 * @type {Object.<string, Array.<string>>}
 * @private
 */
ol.format.KML.PLACEMARK_SEQUENCE_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, [
      'name', 'open', 'visibility', 'address', 'phoneNumber', 'description',
      'styleUrl', 'Style'
    ]);


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlSerializer>>}
 * @private
 */
ol.format.KML.PLACEMARK_SERIALIZERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'MultiGeometry': ol.xml.makeChildAppender(
          ol.format.KML.writeMultiGeometry_),
      'LineString': ol.xml.makeChildAppender(
          ol.format.KML.writePrimitiveGeometry_),
      'LinearRing': ol.xml.makeChildAppender(
          ol.format.KML.writePrimitiveGeometry_),
      'Point': ol.xml.makeChildAppender(
          ol.format.KML.writePrimitiveGeometry_),
      'Polygon': ol.xml.makeChildAppender(ol.format.KML.writePolygon_),
      'Style': ol.xml.makeChildAppender(ol.format.KML.writeStyle_),
      'address': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
      'description': ol.xml.makeChildAppender(
          ol.format.XSD.writeStringTextNode),
      'name': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
      'open': ol.xml.makeChildAppender(ol.format.XSD.writeBooleanTextNode),
      'phoneNumber': ol.xml.makeChildAppender(
          ol.format.XSD.writeStringTextNode),
      'styleUrl': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode),
      'visibility': ol.xml.makeChildAppender(
          ol.format.XSD.writeBooleanTextNode)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlSerializer>>}
 * @private
 */
ol.format.KML.PRIMITIVE_GEOMETRY_SERIALIZERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'coordinates': ol.xml.makeChildAppender(
          ol.format.KML.writeCoordinatesTextNode_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlSerializer>>}
 * @private
 */
ol.format.KML.POLYGON_SERIALIZERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'outerBoundaryIs': ol.xml.makeChildAppender(
          ol.format.KML.writeBoundaryIs_),
      'innerBoundaryIs': ol.xml.makeChildAppender(
          ol.format.KML.writeBoundaryIs_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlSerializer>>}
 * @private
 */
ol.format.KML.POLY_STYLE_SERIALIZERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'color': ol.xml.makeChildAppender(ol.format.KML.writeColorTextNode_)
    });


/**
 * @const
 * @type {Object.<string, Array.<string>>}
 * @private
 */
ol.format.KML.STYLE_SEQUENCE_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, [
      'IconStyle', 'LabelStyle', 'LineStyle', 'PolyStyle'
    ]);


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlSerializer>>}
 * @private
 */
ol.format.KML.STYLE_SERIALIZERS_ = ol.xml.makeStructureNS(
    ol.format.KML.NAMESPACE_URIS_, {
      'IconStyle': ol.xml.makeChildAppender(ol.format.KML.writeIconStyle_),
      'LabelStyle': ol.xml.makeChildAppender(ol.format.KML.writeLabelStyle_),
      'LineStyle': ol.xml.makeChildAppender(ol.format.KML.writeLineStyle_),
      'PolyStyle': ol.xml.makeChildAppender(ol.format.KML.writePolyStyle_)
    });


/**
 * @const
 * @param {*} value Value.
 * @param {Array.<*>} objectStack Object stack.
 * @param {string=} opt_nodeName Node name.
 * @return {Node|undefined} Node.
 * @private
 */
ol.format.KML.GX_NODE_FACTORY_ = function(value, objectStack, opt_nodeName) {
  return ol.xml.createElementNS(ol.format.KML.GX_NAMESPACE_URIS_[0],
      'gx:' + opt_nodeName);
};


/**
 * @const
 * @param {*} value Value.
 * @param {Array.<*>} objectStack Object stack.
 * @param {string=} opt_nodeName Node name.
 * @return {Node|undefined} Node.
 * @private
 */
ol.format.KML.DOCUMENT_NODE_FACTORY_ = function(value, objectStack,
    opt_nodeName) {
  var parentNode = objectStack[objectStack.length - 1].node;
  goog.DEBUG && console.assert(ol.xml.isNode(parentNode),
      'parentNode should be an XML node');
  return ol.xml.createElementNS(parentNode.namespaceURI, 'Placemark');
};


/**
 * @const
 * @param {*} value Value.
 * @param {Array.<*>} objectStack Object stack.
 * @param {string=} opt_nodeName Node name.
 * @return {Node|undefined} Node.
 * @private
 */
ol.format.KML.GEOMETRY_NODE_FACTORY_ = function(value, objectStack,
    opt_nodeName) {
  if (value) {
    var parentNode = objectStack[objectStack.length - 1].node;
    goog.DEBUG && console.assert(ol.xml.isNode(parentNode),
        'parentNode should be an XML node');
    return ol.xml.createElementNS(parentNode.namespaceURI,
        ol.format.KML.GEOMETRY_TYPE_TO_NODENAME_[/** @type {ol.geom.Geometry} */ (value).getType()]);
  }
};


/**
 * A factory for creating coordinates nodes.
 * @const
 * @type {function(*, Array.<*>, string=): (Node|undefined)}
 * @private
 */
ol.format.KML.COLOR_NODE_FACTORY_ = ol.xml.makeSimpleNodeFactory('color');


/**
 * A factory for creating coordinates nodes.
 * @const
 * @type {function(*, Array.<*>, string=): (Node|undefined)}
 * @private
 */
ol.format.KML.COORDINATES_NODE_FACTORY_ =
    ol.xml.makeSimpleNodeFactory('coordinates');


/**
 * A factory for creating innerBoundaryIs nodes.
 * @const
 * @type {function(*, Array.<*>, string=): (Node|undefined)}
 * @private
 */
ol.format.KML.INNER_BOUNDARY_NODE_FACTORY_ =
    ol.xml.makeSimpleNodeFactory('innerBoundaryIs');


/**
 * A factory for creating Point nodes.
 * @const
 * @type {function(*, Array.<*>, string=): (Node|undefined)}
 * @private
 */
ol.format.KML.POINT_NODE_FACTORY_ =
    ol.xml.makeSimpleNodeFactory('Point');


/**
 * A factory for creating LineString nodes.
 * @const
 * @type {function(*, Array.<*>, string=): (Node|undefined)}
 * @private
 */
ol.format.KML.LINE_STRING_NODE_FACTORY_ =
    ol.xml.makeSimpleNodeFactory('LineString');


/**
 * A factory for creating LinearRing nodes.
 * @const
 * @type {function(*, Array.<*>, string=): (Node|undefined)}
 * @private
 */
ol.format.KML.LINEAR_RING_NODE_FACTORY_ =
    ol.xml.makeSimpleNodeFactory('LinearRing');


/**
 * A factory for creating Polygon nodes.
 * @const
 * @type {function(*, Array.<*>, string=): (Node|undefined)}
 * @private
 */
ol.format.KML.POLYGON_NODE_FACTORY_ =
    ol.xml.makeSimpleNodeFactory('Polygon');


/**
 * A factory for creating outerBoundaryIs nodes.
 * @const
 * @type {function(*, Array.<*>, string=): (Node|undefined)}
 * @private
 */
ol.format.KML.OUTER_BOUNDARY_NODE_FACTORY_ =
    ol.xml.makeSimpleNodeFactory('outerBoundaryIs');


/**
 * Encode an array of features in the KML format. GeometryCollections, MultiPoints,
 * MultiLineStrings, and MultiPolygons are output as MultiGeometries.
 *
 * @function
 * @param {Array.<ol.Feature>} features Features.
 * @param {olx.format.WriteOptions=} opt_options Options.
 * @return {string} Result.
 * @api stable
 */
ol.format.KML.prototype.writeFeatures;


/**
 * Encode an array of features in the KML format as an XML node. GeometryCollections,
 * MultiPoints, MultiLineStrings, and MultiPolygons are output as MultiGeometries.
 *
 * @param {Array.<ol.Feature>} features Features.
 * @param {olx.format.WriteOptions=} opt_options Options.
 * @return {Node} Node.
 * @api
 */
ol.format.KML.prototype.writeFeaturesNode = function(features, opt_options) {
  opt_options = this.adaptOptions(opt_options);
  var kml = ol.xml.createElementNS(ol.format.KML.NAMESPACE_URIS_[4], 'kml');
  var xmlnsUri = 'http://www.w3.org/2000/xmlns/';
  var xmlSchemaInstanceUri = 'http://www.w3.org/2001/XMLSchema-instance';
  ol.xml.setAttributeNS(kml, xmlnsUri, 'xmlns:gx',
      ol.format.KML.GX_NAMESPACE_URIS_[0]);
  ol.xml.setAttributeNS(kml, xmlnsUri, 'xmlns:xsi', xmlSchemaInstanceUri);
  ol.xml.setAttributeNS(kml, xmlSchemaInstanceUri, 'xsi:schemaLocation',
      ol.format.KML.SCHEMA_LOCATION_);

  var /** @type {ol.XmlNodeStackItem} */ context = {node: kml};
  var properties = {};
  if (features.length > 1) {
    properties['Document'] = features;
  } else if (features.length == 1) {
    properties['Placemark'] = features[0];
  }
  var orderedKeys = ol.format.KML.KML_SEQUENCE_[kml.namespaceURI];
  var values = ol.xml.makeSequence(properties, orderedKeys);
  ol.xml.pushSerializeAndPop(context, ol.format.KML.KML_SERIALIZERS_,
      ol.xml.OBJECT_PROPERTY_NODE_FACTORY, values, [opt_options], orderedKeys,
      this);
  return kml;
};

goog.provide('ol.ext.pbf');
/** @typedef {function(*)} */
ol.ext.pbf;
(function() {
var exports = {};
var module = {exports: exports};
var define;
/**
 * @fileoverview
 * @suppress {accessControls, ambiguousFunctionDecl, checkDebuggerStatement, checkRegExp, checkTypes, checkVars, const, constantProperty, deprecated, duplicate, es5Strict, fileoverviewTags, missingProperties, nonStandardJsDocs, strictModuleDepCheck, suspiciousCode, undefinedNames, undefinedVars, unknownDefines, uselessCode, visibility}
 */
(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.pbf = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(_dereq_,module,exports){
exports.read = function (buffer, offset, isLE, mLen, nBytes) {
  var e, m
  var eLen = nBytes * 8 - mLen - 1
  var eMax = (1 << eLen) - 1
  var eBias = eMax >> 1
  var nBits = -7
  var i = isLE ? (nBytes - 1) : 0
  var d = isLE ? -1 : 1
  var s = buffer[offset + i]

  i += d

  e = s & ((1 << (-nBits)) - 1)
  s >>= (-nBits)
  nBits += eLen
  for (; nBits > 0; e = e * 256 + buffer[offset + i], i += d, nBits -= 8) {}

  m = e & ((1 << (-nBits)) - 1)
  e >>= (-nBits)
  nBits += mLen
  for (; nBits > 0; m = m * 256 + buffer[offset + i], i += d, nBits -= 8) {}

  if (e === 0) {
    e = 1 - eBias
  } else if (e === eMax) {
    return m ? NaN : ((s ? -1 : 1) * Infinity)
  } else {
    m = m + Math.pow(2, mLen)
    e = e - eBias
  }
  return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
}

exports.write = function (buffer, value, offset, isLE, mLen, nBytes) {
  var e, m, c
  var eLen = nBytes * 8 - mLen - 1
  var eMax = (1 << eLen) - 1
  var eBias = eMax >> 1
  var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)
  var i = isLE ? 0 : (nBytes - 1)
  var d = isLE ? 1 : -1
  var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0

  value = Math.abs(value)

  if (isNaN(value) || value === Infinity) {
    m = isNaN(value) ? 1 : 0
    e = eMax
  } else {
    e = Math.floor(Math.log(value) / Math.LN2)
    if (value * (c = Math.pow(2, -e)) < 1) {
      e--
      c *= 2
    }
    if (e + eBias >= 1) {
      value += rt / c
    } else {
      value += rt * Math.pow(2, 1 - eBias)
    }
    if (value * c >= 2) {
      e++
      c /= 2
    }

    if (e + eBias >= eMax) {
      m = 0
      e = eMax
    } else if (e + eBias >= 1) {
      m = (value * c - 1) * Math.pow(2, mLen)
      e = e + eBias
    } else {
      m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)
      e = 0
    }
  }

  for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}

  e = (e << mLen) | m
  eLen += mLen
  for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}

  buffer[offset + i - d] |= s * 128
}

},{}],2:[function(_dereq_,module,exports){
'use strict';

// lightweight Buffer shim for pbf browser build
// based on code from github.com/feross/buffer (MIT-licensed)

module.exports = Buffer;

var ieee754 = _dereq_('ieee754');

var BufferMethods;

function Buffer(length) {
    var arr;
    if (length && length.length) {
        arr = length;
        length = arr.length;
    }
    var buf = new Uint8Array(length || 0);
    if (arr) buf.set(arr);

    buf.readUInt32LE = BufferMethods.readUInt32LE;
    buf.writeUInt32LE = BufferMethods.writeUInt32LE;
    buf.readInt32LE = BufferMethods.readInt32LE;
    buf.writeInt32LE = BufferMethods.writeInt32LE;
    buf.readFloatLE = BufferMethods.readFloatLE;
    buf.writeFloatLE = BufferMethods.writeFloatLE;
    buf.readDoubleLE = BufferMethods.readDoubleLE;
    buf.writeDoubleLE = BufferMethods.writeDoubleLE;
    buf.toString = BufferMethods.toString;
    buf.write = BufferMethods.write;
    buf.slice = BufferMethods.slice;
    buf.copy = BufferMethods.copy;

    buf._isBuffer = true;
    return buf;
}

var lastStr, lastStrEncoded;

BufferMethods = {
    readUInt32LE: function(pos) {
        return ((this[pos]) |
            (this[pos + 1] << 8) |
            (this[pos + 2] << 16)) +
            (this[pos + 3] * 0x1000000);
    },

    writeUInt32LE: function(val, pos) {
        this[pos] = val;
        this[pos + 1] = (val >>> 8);
        this[pos + 2] = (val >>> 16);
        this[pos + 3] = (val >>> 24);
    },

    readInt32LE: function(pos) {
        return ((this[pos]) |
            (this[pos + 1] << 8) |
            (this[pos + 2] << 16)) +
            (this[pos + 3] << 24);
    },

    readFloatLE:  function(pos) { return ieee754.read(this, pos, true, 23, 4); },
    readDoubleLE: function(pos) { return ieee754.read(this, pos, true, 52, 8); },

    writeFloatLE:  function(val, pos) { return ieee754.write(this, val, pos, true, 23, 4); },
    writeDoubleLE: function(val, pos) { return ieee754.write(this, val, pos, true, 52, 8); },

    toString: function(encoding, start, end) {
        var str = '',
            tmp = '';

        start = start || 0;
        end = Math.min(this.length, end || this.length);

        for (var i = start; i < end; i++) {
            var ch = this[i];
            if (ch <= 0x7F) {
                str += decodeURIComponent(tmp) + String.fromCharCode(ch);
                tmp = '';
            } else {
                tmp += '%' + ch.toString(16);
            }
        }

        str += decodeURIComponent(tmp);

        return str;
    },

    write: function(str, pos) {
        var bytes = str === lastStr ? lastStrEncoded : encodeString(str);
        for (var i = 0; i < bytes.length; i++) {
            this[pos + i] = bytes[i];
        }
    },

    slice: function(start, end) {
        return this.subarray(start, end);
    },

    copy: function(buf, pos) {
        pos = pos || 0;
        for (var i = 0; i < this.length; i++) {
            buf[pos + i] = this[i];
        }
    }
};

BufferMethods.writeInt32LE = BufferMethods.writeUInt32LE;

Buffer.byteLength = function(str) {
    lastStr = str;
    lastStrEncoded = encodeString(str);
    return lastStrEncoded.length;
};

Buffer.isBuffer = function(buf) {
    return !!(buf && buf._isBuffer);
};

function encodeString(str) {
    var length = str.length,
        bytes = [];

    for (var i = 0, c, lead; i < length; i++) {
        c = str.charCodeAt(i); // code point

        if (c > 0xD7FF && c < 0xE000) {

            if (lead) {
                if (c < 0xDC00) {
                    bytes.push(0xEF, 0xBF, 0xBD);
                    lead = c;
                    continue;

                } else {
                    c = lead - 0xD800 << 10 | c - 0xDC00 | 0x10000;
                    lead = null;
                }

            } else {
                if (c > 0xDBFF || (i + 1 === length)) bytes.push(0xEF, 0xBF, 0xBD);
                else lead = c;

                continue;
            }

        } else if (lead) {
            bytes.push(0xEF, 0xBF, 0xBD);
            lead = null;
        }

        if (c < 0x80) bytes.push(c);
        else if (c < 0x800) bytes.push(c >> 0x6 | 0xC0, c & 0x3F | 0x80);
        else if (c < 0x10000) bytes.push(c >> 0xC | 0xE0, c >> 0x6 & 0x3F | 0x80, c & 0x3F | 0x80);
        else bytes.push(c >> 0x12 | 0xF0, c >> 0xC & 0x3F | 0x80, c >> 0x6 & 0x3F | 0x80, c & 0x3F | 0x80);
    }
    return bytes;
}

},{"ieee754":1}],3:[function(_dereq_,module,exports){
(function (global){
'use strict';

module.exports = Pbf;

var Buffer = global.Buffer || _dereq_('./buffer');

function Pbf(buf) {
    this.buf = !Buffer.isBuffer(buf) ? new Buffer(buf || 0) : buf;
    this.pos = 0;
    this.length = this.buf.length;
}

Pbf.Varint  = 0; // varint: int32, int64, uint32, uint64, sint32, sint64, bool, enum
Pbf.Fixed64 = 1; // 64-bit: double, fixed64, sfixed64
Pbf.Bytes   = 2; // length-delimited: string, bytes, embedded messages, packed repeated fields
Pbf.Fixed32 = 5; // 32-bit: float, fixed32, sfixed32

var SHIFT_LEFT_32 = (1 << 16) * (1 << 16),
    SHIFT_RIGHT_32 = 1 / SHIFT_LEFT_32,
    POW_2_63 = Math.pow(2, 63);

Pbf.prototype = {

    destroy: function() {
        this.buf = null;
    },

    // === READING =================================================================

    readFields: function(readField, result, end) {
        end = end || this.length;

        while (this.pos < end) {
            var val = this.readVarint(),
                tag = val >> 3,
                startPos = this.pos;

            readField(tag, result, this);

            if (this.pos === startPos) this.skip(val);
        }
        return result;
    },

    readMessage: function(readField, result) {
        return this.readFields(readField, result, this.readVarint() + this.pos);
    },

    readFixed32: function() {
        var val = this.buf.readUInt32LE(this.pos);
        this.pos += 4;
        return val;
    },

    readSFixed32: function() {
        var val = this.buf.readInt32LE(this.pos);
        this.pos += 4;
        return val;
    },

    // 64-bit int handling is based on github.com/dpw/node-buffer-more-ints (MIT-licensed)

    readFixed64: function() {
        var val = this.buf.readUInt32LE(this.pos) + this.buf.readUInt32LE(this.pos + 4) * SHIFT_LEFT_32;
        this.pos += 8;
        return val;
    },

    readSFixed64: function() {
        var val = this.buf.readUInt32LE(this.pos) + this.buf.readInt32LE(this.pos + 4) * SHIFT_LEFT_32;
        this.pos += 8;
        return val;
    },

    readFloat: function() {
        var val = this.buf.readFloatLE(this.pos);
        this.pos += 4;
        return val;
    },

    readDouble: function() {
        var val = this.buf.readDoubleLE(this.pos);
        this.pos += 8;
        return val;
    },

    readVarint: function() {
        var buf = this.buf,
            val, b;

        b = buf[this.pos++]; val  =  b & 0x7f;        if (b < 0x80) return val;
        b = buf[this.pos++]; val |= (b & 0x7f) << 7;  if (b < 0x80) return val;
        b = buf[this.pos++]; val |= (b & 0x7f) << 14; if (b < 0x80) return val;
        b = buf[this.pos++]; val |= (b & 0x7f) << 21; if (b < 0x80) return val;

        return readVarintRemainder(val, this);
    },

    readVarint64: function() {
        var startPos = this.pos,
            val = this.readVarint();

        if (val < POW_2_63) return val;

        var pos = this.pos - 2;
        while (this.buf[pos] === 0xff) pos--;
        if (pos < startPos) pos = startPos;

        val = 0;
        for (var i = 0; i < pos - startPos + 1; i++) {
            var b = ~this.buf[startPos + i] & 0x7f;
            val += i < 4 ? b << i * 7 : b * Math.pow(2, i * 7);
        }

        return -val - 1;
    },

    readSVarint: function() {
        var num = this.readVarint();
        return num % 2 === 1 ? (num + 1) / -2 : num / 2; // zigzag encoding
    },

    readBoolean: function() {
        return Boolean(this.readVarint());
    },

    readString: function() {
        var end = this.readVarint() + this.pos,
            str = this.buf.toString('utf8', this.pos, end);
        this.pos = end;
        return str;
    },

    readBytes: function() {
        var end = this.readVarint() + this.pos,
            buffer = this.buf.slice(this.pos, end);
        this.pos = end;
        return buffer;
    },

    // verbose for performance reasons; doesn't affect gzipped size

    readPackedVarint: function() {
        var end = this.readVarint() + this.pos, arr = [];
        while (this.pos < end) arr.push(this.readVarint());
        return arr;
    },
    readPackedSVarint: function() {
        var end = this.readVarint() + this.pos, arr = [];
        while (this.pos < end) arr.push(this.readSVarint());
        return arr;
    },
    readPackedBoolean: function() {
        var end = this.readVarint() + this.pos, arr = [];
        while (this.pos < end) arr.push(this.readBoolean());
        return arr;
    },
    readPackedFloat: function() {
        var end = this.readVarint() + this.pos, arr = [];
        while (this.pos < end) arr.push(this.readFloat());
        return arr;
    },
    readPackedDouble: function() {
        var end = this.readVarint() + this.pos, arr = [];
        while (this.pos < end) arr.push(this.readDouble());
        return arr;
    },
    readPackedFixed32: function() {
        var end = this.readVarint() + this.pos, arr = [];
        while (this.pos < end) arr.push(this.readFixed32());
        return arr;
    },
    readPackedSFixed32: function() {
        var end = this.readVarint() + this.pos, arr = [];
        while (this.pos < end) arr.push(this.readSFixed32());
        return arr;
    },
    readPackedFixed64: function() {
        var end = this.readVarint() + this.pos, arr = [];
        while (this.pos < end) arr.push(this.readFixed64());
        return arr;
    },
    readPackedSFixed64: function() {
        var end = this.readVarint() + this.pos, arr = [];
        while (this.pos < end) arr.push(this.readSFixed64());
        return arr;
    },

    skip: function(val) {
        var type = val & 0x7;
        if (type === Pbf.Varint) while (this.buf[this.pos++] > 0x7f) {}
        else if (type === Pbf.Bytes) this.pos = this.readVarint() + this.pos;
        else if (type === Pbf.Fixed32) this.pos += 4;
        else if (type === Pbf.Fixed64) this.pos += 8;
        else throw new Error('Unimplemented type: ' + type);
    },

    // === WRITING =================================================================

    writeTag: function(tag, type) {
        this.writeVarint((tag << 3) | type);
    },

    realloc: function(min) {
        var length = this.length || 16;

        while (length < this.pos + min) length *= 2;

        if (length !== this.length) {
            var buf = new Buffer(length);
            this.buf.copy(buf);
            this.buf = buf;
            this.length = length;
        }
    },

    finish: function() {
        this.length = this.pos;
        this.pos = 0;
        return this.buf.slice(0, this.length);
    },

    writeFixed32: function(val) {
        this.realloc(4);
        this.buf.writeUInt32LE(val, this.pos);
        this.pos += 4;
    },

    writeSFixed32: function(val) {
        this.realloc(4);
        this.buf.writeInt32LE(val, this.pos);
        this.pos += 4;
    },

    writeFixed64: function(val) {
        this.realloc(8);
        this.buf.writeInt32LE(val & -1, this.pos);
        this.buf.writeUInt32LE(Math.floor(val * SHIFT_RIGHT_32), this.pos + 4);
        this.pos += 8;
    },

    writeSFixed64: function(val) {
        this.realloc(8);
        this.buf.writeInt32LE(val & -1, this.pos);
        this.buf.writeInt32LE(Math.floor(val * SHIFT_RIGHT_32), this.pos + 4);
        this.pos += 8;
    },

    writeVarint: function(val) {
        val = +val;

        if (val > 0xfffffff) {
            writeBigVarint(val, this);
            return;
        }

        this.realloc(4);

        this.buf[this.pos++] =           val & 0x7f  | (val > 0x7f ? 0x80 : 0); if (val <= 0x7f) return;
        this.buf[this.pos++] = ((val >>>= 7) & 0x7f) | (val > 0x7f ? 0x80 : 0); if (val <= 0x7f) return;
        this.buf[this.pos++] = ((val >>>= 7) & 0x7f) | (val > 0x7f ? 0x80 : 0); if (val <= 0x7f) return;
        this.buf[this.pos++] =   (val >>> 7) & 0x7f;
    },

    writeSVarint: function(val) {
        this.writeVarint(val < 0 ? -val * 2 - 1 : val * 2);
    },

    writeBoolean: function(val) {
        this.writeVarint(Boolean(val));
    },

    writeString: function(str) {
        str = String(str);
        var bytes = Buffer.byteLength(str);
        this.writeVarint(bytes);
        this.realloc(bytes);
        this.buf.write(str, this.pos);
        this.pos += bytes;
    },

    writeFloat: function(val) {
        this.realloc(4);
        this.buf.writeFloatLE(val, this.pos);
        this.pos += 4;
    },

    writeDouble: function(val) {
        this.realloc(8);
        this.buf.writeDoubleLE(val, this.pos);
        this.pos += 8;
    },

    writeBytes: function(buffer) {
        var len = buffer.length;
        this.writeVarint(len);
        this.realloc(len);
        for (var i = 0; i < len; i++) this.buf[this.pos++] = buffer[i];
    },

    writeRawMessage: function(fn, obj) {
        this.pos++; // reserve 1 byte for short message length

        // write the message directly to the buffer and see how much was written
        var startPos = this.pos;
        fn(obj, this);
        var len = this.pos - startPos;

        if (len >= 0x80) reallocForRawMessage(startPos, len, this);

        // finally, write the message length in the reserved place and restore the position
        this.pos = startPos - 1;
        this.writeVarint(len);
        this.pos += len;
    },

    writeMessage: function(tag, fn, obj) {
        this.writeTag(tag, Pbf.Bytes);
        this.writeRawMessage(fn, obj);
    },

    writePackedVarint:   function(tag, arr) { this.writeMessage(tag, writePackedVarint, arr);   },
    writePackedSVarint:  function(tag, arr) { this.writeMessage(tag, writePackedSVarint, arr);  },
    writePackedBoolean:  function(tag, arr) { this.writeMessage(tag, writePackedBoolean, arr);  },
    writePackedFloat:    function(tag, arr) { this.writeMessage(tag, writePackedFloat, arr);    },
    writePackedDouble:   function(tag, arr) { this.writeMessage(tag, writePackedDouble, arr);   },
    writePackedFixed32:  function(tag, arr) { this.writeMessage(tag, writePackedFixed32, arr);  },
    writePackedSFixed32: function(tag, arr) { this.writeMessage(tag, writePackedSFixed32, arr); },
    writePackedFixed64:  function(tag, arr) { this.writeMessage(tag, writePackedFixed64, arr);  },
    writePackedSFixed64: function(tag, arr) { this.writeMessage(tag, writePackedSFixed64, arr); },

    writeBytesField: function(tag, buffer) {
        this.writeTag(tag, Pbf.Bytes);
        this.writeBytes(buffer);
    },
    writeFixed32Field: function(tag, val) {
        this.writeTag(tag, Pbf.Fixed32);
        this.writeFixed32(val);
    },
    writeSFixed32Field: function(tag, val) {
        this.writeTag(tag, Pbf.Fixed32);
        this.writeSFixed32(val);
    },
    writeFixed64Field: function(tag, val) {
        this.writeTag(tag, Pbf.Fixed64);
        this.writeFixed64(val);
    },
    writeSFixed64Field: function(tag, val) {
        this.writeTag(tag, Pbf.Fixed64);
        this.writeSFixed64(val);
    },
    writeVarintField: function(tag, val) {
        this.writeTag(tag, Pbf.Varint);
        this.writeVarint(val);
    },
    writeSVarintField: function(tag, val) {
        this.writeTag(tag, Pbf.Varint);
        this.writeSVarint(val);
    },
    writeStringField: function(tag, str) {
        this.writeTag(tag, Pbf.Bytes);
        this.writeString(str);
    },
    writeFloatField: function(tag, val) {
        this.writeTag(tag, Pbf.Fixed32);
        this.writeFloat(val);
    },
    writeDoubleField: function(tag, val) {
        this.writeTag(tag, Pbf.Fixed64);
        this.writeDouble(val);
    },
    writeBooleanField: function(tag, val) {
        this.writeVarintField(tag, Boolean(val));
    }
};

function readVarintRemainder(val, pbf) {
    var buf = pbf.buf, b;

    b = buf[pbf.pos++]; val += (b & 0x7f) * 0x10000000;         if (b < 0x80) return val;
    b = buf[pbf.pos++]; val += (b & 0x7f) * 0x800000000;        if (b < 0x80) return val;
    b = buf[pbf.pos++]; val += (b & 0x7f) * 0x40000000000;      if (b < 0x80) return val;
    b = buf[pbf.pos++]; val += (b & 0x7f) * 0x2000000000000;    if (b < 0x80) return val;
    b = buf[pbf.pos++]; val += (b & 0x7f) * 0x100000000000000;  if (b < 0x80) return val;
    b = buf[pbf.pos++]; val += (b & 0x7f) * 0x8000000000000000; if (b < 0x80) return val;

    throw new Error('Expected varint not more than 10 bytes');
}

function writeBigVarint(val, pbf) {
    pbf.realloc(10);

    var maxPos = pbf.pos + 10;

    while (val >= 1) {
        if (pbf.pos >= maxPos) throw new Error('Given varint doesn\'t fit into 10 bytes');
        var b = val & 0xff;
        pbf.buf[pbf.pos++] = b | (val >= 0x80 ? 0x80 : 0);
        val /= 0x80;
    }
}

function reallocForRawMessage(startPos, len, pbf) {
    var extraLen =
        len <= 0x3fff ? 1 :
        len <= 0x1fffff ? 2 :
        len <= 0xfffffff ? 3 : Math.ceil(Math.log(len) / (Math.LN2 * 7));

    // if 1 byte isn't enough for encoding message length, shift the data to the right
    pbf.realloc(extraLen);
    for (var i = pbf.pos - 1; i >= startPos; i--) pbf.buf[i + extraLen] = pbf.buf[i];
}

function writePackedVarint(arr, pbf)   { for (var i = 0; i < arr.length; i++) pbf.writeVarint(arr[i]);   }
function writePackedSVarint(arr, pbf)  { for (var i = 0; i < arr.length; i++) pbf.writeSVarint(arr[i]);  }
function writePackedFloat(arr, pbf)    { for (var i = 0; i < arr.length; i++) pbf.writeFloat(arr[i]);    }
function writePackedDouble(arr, pbf)   { for (var i = 0; i < arr.length; i++) pbf.writeDouble(arr[i]);   }
function writePackedBoolean(arr, pbf)  { for (var i = 0; i < arr.length; i++) pbf.writeBoolean(arr[i]);  }
function writePackedFixed32(arr, pbf)  { for (var i = 0; i < arr.length; i++) pbf.writeFixed32(arr[i]);  }
function writePackedSFixed32(arr, pbf) { for (var i = 0; i < arr.length; i++) pbf.writeSFixed32(arr[i]); }
function writePackedFixed64(arr, pbf)  { for (var i = 0; i < arr.length; i++) pbf.writeFixed64(arr[i]);  }
function writePackedSFixed64(arr, pbf) { for (var i = 0; i < arr.length; i++) pbf.writeSFixed64(arr[i]); }

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./buffer":2}]},{},[3])(3)
});
ol.ext.pbf = module.exports;
})();

goog.provide('ol.ext.vectortile');
/** @typedef {function(*)} */
ol.ext.vectortile;
(function() {
var exports = {};
var module = {exports: exports};
var define;
/**
 * @fileoverview
 * @suppress {accessControls, ambiguousFunctionDecl, checkDebuggerStatement, checkRegExp, checkTypes, checkVars, const, constantProperty, deprecated, duplicate, es5Strict, fileoverviewTags, missingProperties, nonStandardJsDocs, strictModuleDepCheck, suspiciousCode, undefinedNames, undefinedVars, unknownDefines, uselessCode, visibility}
 */
(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.vectortile = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(_dereq_,module,exports){
'use strict';

module.exports = Point;

function Point(x, y) {
    this.x = x;
    this.y = y;
}

Point.prototype = {
    clone: function() { return new Point(this.x, this.y); },

    add:     function(p) { return this.clone()._add(p);     },
    sub:     function(p) { return this.clone()._sub(p);     },
    mult:    function(k) { return this.clone()._mult(k);    },
    div:     function(k) { return this.clone()._div(k);     },
    rotate:  function(a) { return this.clone()._rotate(a);  },
    matMult: function(m) { return this.clone()._matMult(m); },
    unit:    function() { return this.clone()._unit(); },
    perp:    function() { return this.clone()._perp(); },
    round:   function() { return this.clone()._round(); },

    mag: function() {
        return Math.sqrt(this.x * this.x + this.y * this.y);
    },

    equals: function(p) {
        return this.x === p.x &&
               this.y === p.y;
    },

    dist: function(p) {
        return Math.sqrt(this.distSqr(p));
    },

    distSqr: function(p) {
        var dx = p.x - this.x,
            dy = p.y - this.y;
        return dx * dx + dy * dy;
    },

    angle: function() {
        return Math.atan2(this.y, this.x);
    },

    angleTo: function(b) {
        return Math.atan2(this.y - b.y, this.x - b.x);
    },

    angleWith: function(b) {
        return this.angleWithSep(b.x, b.y);
    },

    // Find the angle of the two vectors, solving the formula for the cross product a x b = |a||b|sin(θ) for θ.
    angleWithSep: function(x, y) {
        return Math.atan2(
            this.x * y - this.y * x,
            this.x * x + this.y * y);
    },

    _matMult: function(m) {
        var x = m[0] * this.x + m[1] * this.y,
            y = m[2] * this.x + m[3] * this.y;
        this.x = x;
        this.y = y;
        return this;
    },

    _add: function(p) {
        this.x += p.x;
        this.y += p.y;
        return this;
    },

    _sub: function(p) {
        this.x -= p.x;
        this.y -= p.y;
        return this;
    },

    _mult: function(k) {
        this.x *= k;
        this.y *= k;
        return this;
    },

    _div: function(k) {
        this.x /= k;
        this.y /= k;
        return this;
    },

    _unit: function() {
        this._div(this.mag());
        return this;
    },

    _perp: function() {
        var y = this.y;
        this.y = this.x;
        this.x = -y;
        return this;
    },

    _rotate: function(angle) {
        var cos = Math.cos(angle),
            sin = Math.sin(angle),
            x = cos * this.x - sin * this.y,
            y = sin * this.x + cos * this.y;
        this.x = x;
        this.y = y;
        return this;
    },

    _round: function() {
        this.x = Math.round(this.x);
        this.y = Math.round(this.y);
        return this;
    }
};

// constructs Point from an array if necessary
Point.convert = function (a) {
    if (a instanceof Point) {
        return a;
    }
    if (Array.isArray(a)) {
        return new Point(a[0], a[1]);
    }
    return a;
};

},{}],2:[function(_dereq_,module,exports){
module.exports.VectorTile = _dereq_('./lib/vectortile.js');
module.exports.VectorTileFeature = _dereq_('./lib/vectortilefeature.js');
module.exports.VectorTileLayer = _dereq_('./lib/vectortilelayer.js');

},{"./lib/vectortile.js":3,"./lib/vectortilefeature.js":4,"./lib/vectortilelayer.js":5}],3:[function(_dereq_,module,exports){
'use strict';

var VectorTileLayer = _dereq_('./vectortilelayer');

module.exports = VectorTile;

function VectorTile(pbf, end) {
    this.layers = pbf.readFields(readTile, {}, end);
}

function readTile(tag, layers, pbf) {
    if (tag === 3) {
        var layer = new VectorTileLayer(pbf, pbf.readVarint() + pbf.pos);
        if (layer.length) layers[layer.name] = layer;
    }
}


},{"./vectortilelayer":5}],4:[function(_dereq_,module,exports){
'use strict';

var Point = _dereq_('point-geometry');

module.exports = VectorTileFeature;

function VectorTileFeature(pbf, end, extent, keys, values) {
    // Public
    this.properties = {};
    this.extent = extent;
    this.type = 0;

    // Private
    this._pbf = pbf;
    this._geometry = -1;
    this._keys = keys;
    this._values = values;

    pbf.readFields(readFeature, this, end);
}

function readFeature(tag, feature, pbf) {
    if (tag == 1) feature.id = pbf.readVarint();
    else if (tag == 2) readTag(pbf, feature);
    else if (tag == 3) feature.type = pbf.readVarint();
    else if (tag == 4) feature._geometry = pbf.pos;
}

function readTag(pbf, feature) {
    var end = pbf.readVarint() + pbf.pos;

    while (pbf.pos < end) {
        var key = feature._keys[pbf.readVarint()],
            value = feature._values[pbf.readVarint()];
        feature.properties[key] = value;
    }
}

VectorTileFeature.types = ['Unknown', 'Point', 'LineString', 'Polygon'];

VectorTileFeature.prototype.loadGeometry = function() {
    var pbf = this._pbf;
    pbf.pos = this._geometry;

    var end = pbf.readVarint() + pbf.pos,
        cmd = 1,
        length = 0,
        x = 0,
        y = 0,
        lines = [],
        line;

    while (pbf.pos < end) {
        if (!length) {
            var cmdLen = pbf.readVarint();
            cmd = cmdLen & 0x7;
            length = cmdLen >> 3;
        }

        length--;

        if (cmd === 1 || cmd === 2) {
            x += pbf.readSVarint();
            y += pbf.readSVarint();

            if (cmd === 1) { // moveTo
                if (line) lines.push(line);
                line = [];
            }

            line.push(new Point(x, y));

        } else if (cmd === 7) {

            // Workaround for https://github.com/mapbox/mapnik-vector-tile/issues/90
            if (line) {
                line.push(line[0].clone()); // closePolygon
            }

        } else {
            throw new Error('unknown command ' + cmd);
        }
    }

    if (line) lines.push(line);

    return lines;
};

VectorTileFeature.prototype.bbox = function() {
    var pbf = this._pbf;
    pbf.pos = this._geometry;

    var end = pbf.readVarint() + pbf.pos,
        cmd = 1,
        length = 0,
        x = 0,
        y = 0,
        x1 = Infinity,
        x2 = -Infinity,
        y1 = Infinity,
        y2 = -Infinity;

    while (pbf.pos < end) {
        if (!length) {
            var cmdLen = pbf.readVarint();
            cmd = cmdLen & 0x7;
            length = cmdLen >> 3;
        }

        length--;

        if (cmd === 1 || cmd === 2) {
            x += pbf.readSVarint();
            y += pbf.readSVarint();
            if (x < x1) x1 = x;
            if (x > x2) x2 = x;
            if (y < y1) y1 = y;
            if (y > y2) y2 = y;

        } else if (cmd !== 7) {
            throw new Error('unknown command ' + cmd);
        }
    }

    return [x1, y1, x2, y2];
};

VectorTileFeature.prototype.toGeoJSON = function(x, y, z) {
    var size = this.extent * Math.pow(2, z),
        x0 = this.extent * x,
        y0 = this.extent * y,
        coords = this.loadGeometry(),
        type = VectorTileFeature.types[this.type],
        i, j;

    function project(line) {
        for (var j = 0; j < line.length; j++) {
            var p = line[j], y2 = 180 - (p.y + y0) * 360 / size;
            line[j] = [
                (p.x + x0) * 360 / size - 180,
                360 / Math.PI * Math.atan(Math.exp(y2 * Math.PI / 180)) - 90
            ];
        }
    }

    switch (this.type) {
    case 1:
        var points = [];
        for (i = 0; i < coords.length; i++) {
            points[i] = coords[i][0];
        }
        coords = points;
        project(coords);
        break;

    case 2:
        for (i = 0; i < coords.length; i++) {
            project(coords[i]);
        }
        break;

    case 3:
        coords = classifyRings(coords);
        for (i = 0; i < coords.length; i++) {
            for (j = 0; j < coords[i].length; j++) {
                project(coords[i][j]);
            }
        }
        break;
    }

    if (coords.length === 1) {
        coords = coords[0];
    } else {
        type = 'Multi' + type;
    }

    var result = {
        type: "Feature",
        geometry: {
            type: type,
            coordinates: coords
        },
        properties: this.properties
    };

    if ('id' in this) {
        result.id = this.id;
    }

    return result;
};

// classifies an array of rings into polygons with outer rings and holes

function classifyRings(rings) {
    var len = rings.length;

    if (len <= 1) return [rings];

    var polygons = [],
        polygon,
        ccw;

    for (var i = 0; i < len; i++) {
        var area = signedArea(rings[i]);
        if (area === 0) continue;

        if (ccw === undefined) ccw = area < 0;

        if (ccw === area < 0) {
            if (polygon) polygons.push(polygon);
            polygon = [rings[i]];

        } else {
            polygon.push(rings[i]);
        }
    }
    if (polygon) polygons.push(polygon);

    return polygons;
}

function signedArea(ring) {
    var sum = 0;
    for (var i = 0, len = ring.length, j = len - 1, p1, p2; i < len; j = i++) {
        p1 = ring[i];
        p2 = ring[j];
        sum += (p2.x - p1.x) * (p1.y + p2.y);
    }
    return sum;
}

},{"point-geometry":1}],5:[function(_dereq_,module,exports){
'use strict';

var VectorTileFeature = _dereq_('./vectortilefeature.js');

module.exports = VectorTileLayer;

function VectorTileLayer(pbf, end) {
    // Public
    this.version = 1;
    this.name = null;
    this.extent = 4096;
    this.length = 0;

    // Private
    this._pbf = pbf;
    this._keys = [];
    this._values = [];
    this._features = [];

    pbf.readFields(readLayer, this, end);

    this.length = this._features.length;
}

function readLayer(tag, layer, pbf) {
    if (tag === 15) layer.version = pbf.readVarint();
    else if (tag === 1) layer.name = pbf.readString();
    else if (tag === 5) layer.extent = pbf.readVarint();
    else if (tag === 2) layer._features.push(pbf.pos);
    else if (tag === 3) layer._keys.push(pbf.readString());
    else if (tag === 4) layer._values.push(readValueMessage(pbf));
}

function readValueMessage(pbf) {
    var value = null,
        end = pbf.readVarint() + pbf.pos;

    while (pbf.pos < end) {
        var tag = pbf.readVarint() >> 3;

        value = tag === 1 ? pbf.readString() :
            tag === 2 ? pbf.readFloat() :
            tag === 3 ? pbf.readDouble() :
            tag === 4 ? pbf.readVarint64() :
            tag === 5 ? pbf.readVarint() :
            tag === 6 ? pbf.readSVarint() :
            tag === 7 ? pbf.readBoolean() : null;
    }

    return value;
}

// return feature `i` from this layer as a `VectorTileFeature`
VectorTileLayer.prototype.feature = function(i) {
    if (i < 0 || i >= this._features.length) throw new Error('feature index out of bounds');

    this._pbf.pos = this._features[i];

    var end = this._pbf.readVarint() + this._pbf.pos;
    return new VectorTileFeature(this._pbf, end, this.extent, this._keys, this._values);
};

},{"./vectortilefeature.js":4}]},{},[2])(2)
});
ol.ext.vectortile = module.exports;
})();

goog.provide('ol.render.Feature');

goog.require('ol');
goog.require('ol.extent');
goog.require('ol.geom.GeometryType');


/**
 * Lightweight, read-only, {@link ol.Feature} and {@link ol.geom.Geometry} like
 * structure, optimized for rendering and styling. Geometry access through the
 * API is limited to getting the type and extent of the geometry.
 *
 * @constructor
 * @param {ol.geom.GeometryType} type Geometry type.
 * @param {Array.<number>} flatCoordinates Flat coordinates. These always need
 *     to be right-handed for polygons.
 * @param {Array.<number>|Array.<Array.<number>>} ends Ends or Endss.
 * @param {Object.<string, *>} properties Properties.
 */
ol.render.Feature = function(type, flatCoordinates, ends, properties) {

  /**
   * @private
   * @type {ol.Extent|undefined}
   */
  this.extent_;

  goog.DEBUG && console.assert(type === ol.geom.GeometryType.POINT ||
      type === ol.geom.GeometryType.MULTI_POINT ||
      type === ol.geom.GeometryType.LINE_STRING ||
      type === ol.geom.GeometryType.MULTI_LINE_STRING ||
      type === ol.geom.GeometryType.POLYGON,
      'Need a Point, MultiPoint, LineString, MultiLineString or Polygon type');

  /**
   * @private
   * @type {ol.geom.GeometryType}
   */
  this.type_ = type;

  /**
   * @private
   * @type {Array.<number>}
   */
  this.flatCoordinates_ = flatCoordinates;

  /**
   * @private
   * @type {Array.<number>|Array.<Array.<number>>}
   */
  this.ends_ = ends;

  /**
   * @private
   * @type {Object.<string, *>}
   */
  this.properties_ = properties;

};


/**
 * Get a feature property by its key.
 * @param {string} key Key
 * @return {*} Value for the requested key.
 * @api
 */
ol.render.Feature.prototype.get = function(key) {
  return this.properties_[key];
};


/**
 * @return {Array.<number>|Array.<Array.<number>>} Ends or endss.
 */
ol.render.Feature.prototype.getEnds = function() {
  return this.ends_;
};


/**
 * Get the extent of this feature's geometry.
 * @return {ol.Extent} Extent.
 * @api
 */
ol.render.Feature.prototype.getExtent = function() {
  if (!this.extent_) {
    this.extent_ = this.type_ === ol.geom.GeometryType.POINT ?
        ol.extent.createOrUpdateFromCoordinate(this.flatCoordinates_) :
        ol.extent.createOrUpdateFromFlatCoordinates(
            this.flatCoordinates_, 0, this.flatCoordinates_.length, 2);

  }
  return this.extent_;
};


/**
 * @return {Array.<number>} Flat coordinates.
 */
ol.render.Feature.prototype.getOrientedFlatCoordinates = function() {
  return this.flatCoordinates_;
};


/**
 * @return {Array.<number>} Flat coordinates.
 */
ol.render.Feature.prototype.getFlatCoordinates =
    ol.render.Feature.prototype.getOrientedFlatCoordinates;


/**
 * Get the feature for working with its geometry.
 * @return {ol.render.Feature} Feature.
 * @api
 */
ol.render.Feature.prototype.getGeometry = function() {
  return this;
};


/**
 * Get the feature properties.
 * @return {Object.<string, *>} Feature properties.
 * @api
 */
ol.render.Feature.prototype.getProperties = function() {
  return this.properties_;
};


/**
 * Get the feature for working with its geometry.
 * @return {ol.render.Feature} Feature.
 */
ol.render.Feature.prototype.getSimplifiedGeometry =
    ol.render.Feature.prototype.getGeometry;


/**
 * @return {number} Stride.
 */
ol.render.Feature.prototype.getStride = function() {
  return 2;
};


/**
 * @return {undefined}
 */
ol.render.Feature.prototype.getStyleFunction = ol.nullFunction;


/**
 * Get the type of this feature's geometry.
 * @return {ol.geom.GeometryType} Geometry type.
 * @api
 */
ol.render.Feature.prototype.getType = function() {
  return this.type_;
};

//FIXME Implement projection handling

goog.provide('ol.format.MVT');

goog.require('ol');
goog.require('ol.ext.pbf');
goog.require('ol.ext.vectortile');
goog.require('ol.format.Feature');
goog.require('ol.format.FormatType');
goog.require('ol.geom.GeometryLayout');
goog.require('ol.geom.GeometryType');
goog.require('ol.geom.LineString');
goog.require('ol.geom.MultiLineString');
goog.require('ol.geom.MultiPoint');
goog.require('ol.geom.Point');
goog.require('ol.geom.Polygon');
goog.require('ol.proj.Projection');
goog.require('ol.proj.Units');
goog.require('ol.render.Feature');


/**
 * @classdesc
 * Feature format for reading data in the Mapbox MVT format.
 *
 * @constructor
 * @extends {ol.format.Feature}
 * @param {olx.format.MVTOptions=} opt_options Options.
 * @api
 */
ol.format.MVT = function(opt_options) {

  ol.format.Feature.call(this);

  var options = opt_options ? opt_options : {};

  /**
   * @type {ol.proj.Projection}
   */
  this.defaultDataProjection = new ol.proj.Projection({
    code: '',
    units: ol.proj.Units.TILE_PIXELS
  });

  /**
   * @private
   * @type {function((ol.geom.Geometry|Object.<string, *>)=)|
   *     function(ol.geom.GeometryType,Array.<number>,
   *         (Array.<number>|Array.<Array.<number>>),Object.<string, *>)}
   */
  this.featureClass_ = options.featureClass ?
      options.featureClass : ol.render.Feature;

  /**
   * @private
   * @type {string}
   */
  this.geometryName_ = options.geometryName ?
      options.geometryName : 'geometry';

  /**
   * @private
   * @type {string}
   */
  this.layerName_ = options.layerName ? options.layerName : 'layer';

  /**
   * @private
   * @type {Array.<string>}
   */
  this.layers_ = options.layers ? options.layers : null;

};
ol.inherits(ol.format.MVT, ol.format.Feature);


/**
 * @inheritDoc
 */
ol.format.MVT.prototype.getType = function() {
  return ol.format.FormatType.ARRAY_BUFFER;
};


/**
 * @private
 * @param {Object} rawFeature Raw Mapbox feature.
 * @param {string} layer Layer.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @return {ol.Feature} Feature.
 */
ol.format.MVT.prototype.readFeature_ = function(
    rawFeature, layer, opt_options) {
  var feature = new this.featureClass_();
  var id = rawFeature.id;
  var values = rawFeature.properties;
  values[this.layerName_] = layer;
  var geometry = ol.format.Feature.transformWithOptions(
      ol.format.MVT.readGeometry_(rawFeature), false,
      this.adaptOptions(opt_options));
  if (geometry) {
    values[this.geometryName_] = geometry;
  }
  feature.setId(id);
  feature.setProperties(values);
  feature.setGeometryName(this.geometryName_);
  return feature;
};


/**
 * @private
 * @param {Object} rawFeature Raw Mapbox feature.
 * @param {string} layer Layer.
 * @return {ol.render.Feature} Feature.
 */
ol.format.MVT.prototype.readRenderFeature_ = function(rawFeature, layer) {
  var coords = rawFeature.loadGeometry();
  var ends = [];
  var flatCoordinates = [];
  ol.format.MVT.calculateFlatCoordinates_(coords, flatCoordinates, ends);

  var type = rawFeature.type;
  /** @type {ol.geom.GeometryType} */
  var geometryType;
  if (type === 1) {
    geometryType = coords.length === 1 ?
        ol.geom.GeometryType.POINT : ol.geom.GeometryType.MULTI_POINT;
  } else if (type === 2) {
    if (coords.length === 1) {
      geometryType = ol.geom.GeometryType.LINE_STRING;
    } else {
      geometryType = ol.geom.GeometryType.MULTI_LINE_STRING;
    }
  } else if (type === 3) {
    geometryType = ol.geom.GeometryType.POLYGON;
  }

  var values = rawFeature.properties;
  values[this.layerName_] = layer;

  return new this.featureClass_(geometryType, flatCoordinates, ends, values);
};


/**
 * @inheritDoc
 * @api
 */
ol.format.MVT.prototype.readFeatures = function(source, opt_options) {
  var layers = this.layers_;

  var pbf = new ol.ext.pbf(/** @type {ArrayBuffer} */ (source));
  var tile = new ol.ext.vectortile.VectorTile(pbf);
  var features = [];
  var featureClass = this.featureClass_;
  var layer, feature;
  for (var name in tile.layers) {
    if (layers && layers.indexOf(name) == -1) {
      continue;
    }
    layer = tile.layers[name];

    for (var i = 0, ii = layer.length; i < ii; ++i) {
      if (featureClass === ol.render.Feature) {
        feature = this.readRenderFeature_(layer.feature(i), name);
      } else {
        feature = this.readFeature_(layer.feature(i), name, opt_options);
      }
      features.push(feature);
    }
  }

  return features;
};


/**
 * @inheritDoc
 * @api
 */
ol.format.MVT.prototype.readProjection = function(source) {
  return this.defaultDataProjection;
};


/**
 * Sets the layers that features will be read from.
 * @param {Array.<string>} layers Layers.
 * @api
 */
ol.format.MVT.prototype.setLayers = function(layers) {
  this.layers_ = layers;
};


/**
 * @private
 * @param {Object} coords Raw feature coordinates.
 * @param {Array.<number>} flatCoordinates Flat coordinates to be populated by
 *     this function.
 * @param {Array.<number>} ends Ends to be populated by this function.
 */
ol.format.MVT.calculateFlatCoordinates_ = function(
    coords, flatCoordinates, ends) {
  var end = 0;
  for (var i = 0, ii = coords.length; i < ii; ++i) {
    var line = coords[i];
    var j, jj;
    for (j = 0, jj = line.length; j < jj; ++j) {
      var coord = line[j];
      // Non-tilespace coords can be calculated here when a TileGrid and
      // TileCoord are known.
      flatCoordinates.push(coord.x, coord.y);
    }
    end += 2 * j;
    ends.push(end);
  }
};


/**
 * @private
 * @param {Object} rawFeature Raw Mapbox feature.
 * @return {ol.geom.Geometry} Geometry.
 */
ol.format.MVT.readGeometry_ = function(rawFeature) {
  var type = rawFeature.type;
  if (type === 0) {
    return null;
  }

  var coords = rawFeature.loadGeometry();
  var ends = [];
  var flatCoordinates = [];
  ol.format.MVT.calculateFlatCoordinates_(coords, flatCoordinates, ends);

  var geom;
  if (type === 1) {
    geom = coords.length === 1 ?
        new ol.geom.Point(null) : new ol.geom.MultiPoint(null);
  } else if (type === 2) {
    if (coords.length === 1) {
      geom = new ol.geom.LineString(null);
    } else {
      geom = new ol.geom.MultiLineString(null);
    }
  } else if (type === 3) {
    geom = new ol.geom.Polygon(null);
  }

  geom.setFlatCoordinates(ol.geom.GeometryLayout.XY, flatCoordinates,
      ends);

  return geom;
};

goog.provide('ol.format.ogc.filter.Filter');

goog.require('ol');


/**
 * @classdesc
 * Abstract class; normally only used for creating subclasses and not instantiated in apps.
 * Base class for WFS GetFeature filters.
 *
 * @constructor
 * @param {!string} tagName The XML tag name for this filter.
 * @struct
 * @api
 */
ol.format.ogc.filter.Filter = function(tagName) {

  /**
   * @private
   * @type {!string}
   */
  this.tagName_ = tagName;
};

/**
 * The XML tag name for a filter.
 * @returns {!string} Name.
 */
ol.format.ogc.filter.Filter.prototype.getTagName = function() {
  return this.tagName_;
};

goog.provide('ol.format.ogc.filter.Logical');

goog.require('ol');
goog.require('ol.format.ogc.filter.Filter');


/**
 * @classdesc
 * Abstract class; normally only used for creating subclasses and not instantiated in apps.
 * Base class for WFS GetFeature logical filters.
 *
 * @constructor
 * @param {!string} tagName The XML tag name for this filter.
 * @extends {ol.format.ogc.filter.Filter}
 */
ol.format.ogc.filter.Logical = function(tagName) {
  ol.format.ogc.filter.Filter.call(this, tagName);
};
ol.inherits(ol.format.ogc.filter.Logical, ol.format.ogc.filter.Filter);

goog.provide('ol.format.ogc.filter.LogicalBinary');

goog.require('ol');
goog.require('ol.format.ogc.filter.Logical');


/**
 * @classdesc
 * Abstract class; normally only used for creating subclasses and not instantiated in apps.
 * Base class for WFS GetFeature binary logical filters.
 *
 * @constructor
 * @param {!string} tagName The XML tag name for this filter.
 * @param {!ol.format.ogc.filter.Filter} conditionA First filter condition.
 * @param {!ol.format.ogc.filter.Filter} conditionB Second filter condition.
 * @extends {ol.format.ogc.filter.Logical}
 */
ol.format.ogc.filter.LogicalBinary = function(tagName, conditionA, conditionB) {

  ol.format.ogc.filter.Logical.call(this, tagName);

  /**
   * @public
   * @type {!ol.format.ogc.filter.Filter}
   */
  this.conditionA = conditionA;

  /**
   * @public
   * @type {!ol.format.ogc.filter.Filter}
   */
  this.conditionB = conditionB;

};
ol.inherits(ol.format.ogc.filter.LogicalBinary, ol.format.ogc.filter.Logical);

goog.provide('ol.format.ogc.filter.And');

goog.require('ol');
goog.require('ol.format.ogc.filter.LogicalBinary');

/**
 * @classdesc
 * Represents a logical `<And>` operator between two filter conditions.
 *
 * @constructor
 * @param {!ol.format.ogc.filter.Filter} conditionA First filter condition.
 * @param {!ol.format.ogc.filter.Filter} conditionB Second filter condition.
 * @extends {ol.format.ogc.filter.LogicalBinary}
 * @api
 */
ol.format.ogc.filter.And = function(conditionA, conditionB) {
  ol.format.ogc.filter.LogicalBinary.call(this, 'And', conditionA, conditionB);
};
ol.inherits(ol.format.ogc.filter.And, ol.format.ogc.filter.LogicalBinary);

goog.provide('ol.format.ogc.filter.Bbox');

goog.require('ol');
goog.require('ol.format.ogc.filter.Filter');


/**
 * @classdesc
 * Represents a `<BBOX>` operator to test whether a geometry-valued property
 * intersects a fixed bounding box
 *
 * @constructor
 * @param {!string} geometryName Geometry name to use.
 * @param {!ol.Extent} extent Extent.
 * @param {string=} opt_srsName SRS name. No srsName attribute will be
 *    set on geometries when this is not provided.
 * @extends {ol.format.ogc.filter.Filter}
 * @api
 */
ol.format.ogc.filter.Bbox = function(geometryName, extent, opt_srsName) {

  ol.format.ogc.filter.Filter.call(this, 'BBOX');

  /**
   * @public
   * @type {!string}
   */
  this.geometryName = geometryName;

  /**
   * @public
   * @type {ol.Extent}
   */
  this.extent = extent;

  /**
   * @public
   * @type {string|undefined}
   */
  this.srsName = opt_srsName;
};
ol.inherits(ol.format.ogc.filter.Bbox, ol.format.ogc.filter.Filter);

goog.provide('ol.format.ogc.filter.Comparison');

goog.require('ol');
goog.require('ol.format.ogc.filter.Filter');


/**
 * @classdesc
 * Abstract class; normally only used for creating subclasses and not instantiated in apps.
 * Base class for WFS GetFeature property comparison filters.
 *
 * @constructor
 * @param {!string} tagName The XML tag name for this filter.
 * @param {!string} propertyName Name of the context property to compare.
 * @extends {ol.format.ogc.filter.Filter}
 * @api
 */
ol.format.ogc.filter.Comparison = function(tagName, propertyName) {

  ol.format.ogc.filter.Filter.call(this, tagName);

  /**
   * @public
   * @type {!string}
   */
  this.propertyName = propertyName;
};
ol.inherits(ol.format.ogc.filter.Comparison, ol.format.ogc.filter.Filter);

goog.provide('ol.format.ogc.filter.ComparisonBinary');

goog.require('ol');
goog.require('ol.format.ogc.filter.Comparison');


/**
 * @classdesc
 * Abstract class; normally only used for creating subclasses and not instantiated in apps.
 * Base class for WFS GetFeature property binary comparison filters.
 *
 * @constructor
 * @param {!string} tagName The XML tag name for this filter.
 * @param {!string} propertyName Name of the context property to compare.
 * @param {!(string|number)} expression The value to compare.
 * @param {boolean=} opt_matchCase Case-sensitive?
 * @extends {ol.format.ogc.filter.Comparison}
 * @api
 */
ol.format.ogc.filter.ComparisonBinary = function(
    tagName, propertyName, expression, opt_matchCase) {

  ol.format.ogc.filter.Comparison.call(this, tagName, propertyName);

  /**
   * @public
   * @type {!(string|number)}
   */
  this.expression = expression;

  /**
   * @public
   * @type {boolean|undefined}
   */
  this.matchCase = opt_matchCase;
};
ol.inherits(ol.format.ogc.filter.ComparisonBinary, ol.format.ogc.filter.Comparison);

goog.provide('ol.format.ogc.filter.EqualTo');

goog.require('ol');
goog.require('ol.format.ogc.filter.ComparisonBinary');


/**
 * @classdesc
 * Represents a `<PropertyIsEqualTo>` comparison operator.
 *
 * @constructor
 * @param {!string} propertyName Name of the context property to compare.
 * @param {!(string|number)} expression The value to compare.
 * @param {boolean=} opt_matchCase Case-sensitive?
 * @extends {ol.format.ogc.filter.ComparisonBinary}
 * @api
 */
ol.format.ogc.filter.EqualTo = function(propertyName, expression, opt_matchCase) {
  ol.format.ogc.filter.ComparisonBinary.call(this, 'PropertyIsEqualTo', propertyName, expression, opt_matchCase);
};
ol.inherits(ol.format.ogc.filter.EqualTo, ol.format.ogc.filter.ComparisonBinary);

goog.provide('ol.format.ogc.filter.GreaterThan');

goog.require('ol');
goog.require('ol.format.ogc.filter.ComparisonBinary');


/**
 * @classdesc
 * Represents a `<PropertyIsGreaterThan>` comparison operator.
 *
 * @constructor
 * @param {!string} propertyName Name of the context property to compare.
 * @param {!number} expression The value to compare.
 * @extends {ol.format.ogc.filter.ComparisonBinary}
 * @api
 */
ol.format.ogc.filter.GreaterThan = function(propertyName, expression) {
  ol.format.ogc.filter.ComparisonBinary.call(this, 'PropertyIsGreaterThan', propertyName, expression);
};
ol.inherits(ol.format.ogc.filter.GreaterThan, ol.format.ogc.filter.ComparisonBinary);

goog.provide('ol.format.ogc.filter.GreaterThanOrEqualTo');

goog.require('ol');
goog.require('ol.format.ogc.filter.ComparisonBinary');


/**
 * @classdesc
 * Represents a `<PropertyIsGreaterThanOrEqualTo>` comparison operator.
 *
 * @constructor
 * @param {!string} propertyName Name of the context property to compare.
 * @param {!number} expression The value to compare.
 * @extends {ol.format.ogc.filter.ComparisonBinary}
 * @api
 */
ol.format.ogc.filter.GreaterThanOrEqualTo = function(propertyName, expression) {
  ol.format.ogc.filter.ComparisonBinary.call(this, 'PropertyIsGreaterThanOrEqualTo', propertyName, expression);
};
ol.inherits(ol.format.ogc.filter.GreaterThanOrEqualTo, ol.format.ogc.filter.ComparisonBinary);

goog.provide('ol.format.ogc.filter.Spatial');

goog.require('ol');
goog.require('ol.format.ogc.filter.Filter');


/**
 * @classdesc
 * Represents a spatial operator to test whether a geometry-valued property
 * relates to a given geometry.
 *
 * @constructor
 * @param {!string} tagName The XML tag name for this filter.
 * @param {!string} geometryName Geometry name to use.
 * @param {!ol.geom.Geometry} geometry Geometry.
 * @param {string=} opt_srsName SRS name. No srsName attribute will be
 *    set on geometries when this is not provided.
 * @extends {ol.format.ogc.filter.Filter}
 * @api
 */
ol.format.ogc.filter.Spatial = function(tagName, geometryName, geometry, opt_srsName) {

  ol.format.ogc.filter.Filter.call(this, tagName);

  /**
   * @public
   * @type {!string}
   */
  this.geometryName = geometryName || 'the_geom';

  /**
   * @public
   * @type {ol.geom.Geometry}
   */
  this.geometry = geometry;

  /**
   * @public
   * @type {string|undefined}
   */
  this.srsName = opt_srsName;
};
ol.inherits(ol.format.ogc.filter.Spatial, ol.format.ogc.filter.Filter);

goog.provide('ol.format.ogc.filter.Intersects');

goog.require('ol');
goog.require('ol.format.ogc.filter.Spatial');


/**
 * @classdesc
 * Represents a `<Intersects>` operator to test whether a geometry-valued property
 * intersects a given geometry.
 *
 * @constructor
 * @param {!string} geometryName Geometry name to use.
 * @param {!ol.geom.Geometry} geometry Geometry.
 * @param {string=} opt_srsName SRS name. No srsName attribute will be
 *    set on geometries when this is not provided.
 * @extends {ol.format.ogc.filter.Spatial}
 * @api
 */
ol.format.ogc.filter.Intersects = function(geometryName, geometry, opt_srsName) {

  ol.format.ogc.filter.Spatial.call(this, 'Intersects', geometryName, geometry, opt_srsName);

};
ol.inherits(ol.format.ogc.filter.Intersects, ol.format.ogc.filter.Spatial);

goog.provide('ol.format.ogc.filter.IsBetween');

goog.require('ol');
goog.require('ol.format.ogc.filter.Comparison');


/**
 * @classdesc
 * Represents a `<PropertyIsBetween>` comparison operator.
 *
 * @constructor
 * @param {!string} propertyName Name of the context property to compare.
 * @param {!number} lowerBoundary The lower bound of the range.
 * @param {!number} upperBoundary The upper bound of the range.
 * @extends {ol.format.ogc.filter.Comparison}
 * @api
 */
ol.format.ogc.filter.IsBetween = function(propertyName, lowerBoundary, upperBoundary) {
  ol.format.ogc.filter.Comparison.call(this, 'PropertyIsBetween', propertyName);

  /**
   * @public
   * @type {!number}
   */
  this.lowerBoundary = lowerBoundary;

  /**
   * @public
   * @type {!number}
   */
  this.upperBoundary = upperBoundary;
};
ol.inherits(ol.format.ogc.filter.IsBetween, ol.format.ogc.filter.Comparison);

goog.provide('ol.format.ogc.filter.IsLike');

goog.require('ol');
goog.require('ol.format.ogc.filter.Comparison');


/**
 * @classdesc
 * Represents a `<PropertyIsLike>` comparison operator.
 *
 * @constructor
 * @param {!string} propertyName Name of the context property to compare.
 * @param {!string} pattern Text pattern.
 * @param {string=} opt_wildCard Pattern character which matches any sequence of
 *    zero or more string characters. Default is '*'.
 * @param {string=} opt_singleChar pattern character which matches any single
 *    string character. Default is '.'.
 * @param {string=} opt_escapeChar Escape character which can be used to escape
 *    the pattern characters. Default is '!'.
 * @param {boolean=} opt_matchCase Case-sensitive?
 * @extends {ol.format.ogc.filter.Comparison}
 * @api
 */
ol.format.ogc.filter.IsLike = function(propertyName, pattern,
    opt_wildCard, opt_singleChar, opt_escapeChar, opt_matchCase) {
  ol.format.ogc.filter.Comparison.call(this, 'PropertyIsLike', propertyName);

  /**
   * @public
   * @type {!string}
   */
  this.pattern = pattern;

  /**
   * @public
   * @type {!string}
   */
  this.wildCard = (opt_wildCard !== undefined) ? opt_wildCard : '*';

  /**
   * @public
   * @type {!string}
   */
  this.singleChar = (opt_singleChar !== undefined) ? opt_singleChar : '.';

  /**
   * @public
   * @type {!string}
   */
  this.escapeChar = (opt_escapeChar !== undefined) ? opt_escapeChar : '!';

  /**
   * @public
   * @type {boolean|undefined}
   */
  this.matchCase = opt_matchCase;
};
ol.inherits(ol.format.ogc.filter.IsLike, ol.format.ogc.filter.Comparison);

goog.provide('ol.format.ogc.filter.IsNull');

goog.require('ol');
goog.require('ol.format.ogc.filter.Comparison');


/**
 * @classdesc
 * Represents a `<PropertyIsNull>` comparison operator.
 *
 * @constructor
 * @param {!string} propertyName Name of the context property to compare.
 * @extends {ol.format.ogc.filter.Comparison}
 * @api
 */
ol.format.ogc.filter.IsNull = function(propertyName) {
  ol.format.ogc.filter.Comparison.call(this, 'PropertyIsNull', propertyName);
};
ol.inherits(ol.format.ogc.filter.IsNull, ol.format.ogc.filter.Comparison);

goog.provide('ol.format.ogc.filter.LessThan');

goog.require('ol');
goog.require('ol.format.ogc.filter.ComparisonBinary');


/**
 * @classdesc
 * Represents a `<PropertyIsLessThan>` comparison operator.
 *
 * @constructor
 * @param {!string} propertyName Name of the context property to compare.
 * @param {!number} expression The value to compare.
 * @extends {ol.format.ogc.filter.ComparisonBinary}
 * @api
 */
ol.format.ogc.filter.LessThan = function(propertyName, expression) {
  ol.format.ogc.filter.ComparisonBinary.call(this, 'PropertyIsLessThan', propertyName, expression);
};
ol.inherits(ol.format.ogc.filter.LessThan, ol.format.ogc.filter.ComparisonBinary);

goog.provide('ol.format.ogc.filter.LessThanOrEqualTo');

goog.require('ol');
goog.require('ol.format.ogc.filter.ComparisonBinary');


/**
 * @classdesc
 * Represents a `<PropertyIsLessThanOrEqualTo>` comparison operator.
 *
 * @constructor
 * @param {!string} propertyName Name of the context property to compare.
 * @param {!number} expression The value to compare.
 * @extends {ol.format.ogc.filter.ComparisonBinary}
 * @api
 */
ol.format.ogc.filter.LessThanOrEqualTo = function(propertyName, expression) {
  ol.format.ogc.filter.ComparisonBinary.call(this, 'PropertyIsLessThanOrEqualTo', propertyName, expression);
};
ol.inherits(ol.format.ogc.filter.LessThanOrEqualTo, ol.format.ogc.filter.ComparisonBinary);

goog.provide('ol.format.ogc.filter.Not');

goog.require('ol');
goog.require('ol.format.ogc.filter.Logical');


/**
 * @classdesc
 * Represents a logical `<Not>` operator for a filter condition.
 *
 * @constructor
 * @param {!ol.format.ogc.filter.Filter} condition Filter condition.
 * @extends {ol.format.ogc.filter.Logical}
 * @api
 */
ol.format.ogc.filter.Not = function(condition) {

  ol.format.ogc.filter.Logical.call(this, 'Not');

  /**
   * @public
   * @type {!ol.format.ogc.filter.Filter}
   */
  this.condition = condition;
};
ol.inherits(ol.format.ogc.filter.Not, ol.format.ogc.filter.Logical);

goog.provide('ol.format.ogc.filter.NotEqualTo');

goog.require('ol');
goog.require('ol.format.ogc.filter.ComparisonBinary');


/**
 * @classdesc
 * Represents a `<PropertyIsNotEqualTo>` comparison operator.
 *
 * @constructor
 * @param {!string} propertyName Name of the context property to compare.
 * @param {!(string|number)} expression The value to compare.
 * @param {boolean=} opt_matchCase Case-sensitive?
 * @extends {ol.format.ogc.filter.ComparisonBinary}
 * @api
 */
ol.format.ogc.filter.NotEqualTo = function(propertyName, expression, opt_matchCase) {
  ol.format.ogc.filter.ComparisonBinary.call(this, 'PropertyIsNotEqualTo', propertyName, expression, opt_matchCase);
};
ol.inherits(ol.format.ogc.filter.NotEqualTo, ol.format.ogc.filter.ComparisonBinary);

goog.provide('ol.format.ogc.filter.Or');

goog.require('ol');
goog.require('ol.format.ogc.filter.LogicalBinary');


/**
 * @classdesc
 * Represents a logical `<Or>` operator between two filter conditions.
 *
 * @constructor
 * @param {!ol.format.ogc.filter.Filter} conditionA First filter condition.
 * @param {!ol.format.ogc.filter.Filter} conditionB Second filter condition.
 * @extends {ol.format.ogc.filter.LogicalBinary}
 * @api
 */
ol.format.ogc.filter.Or = function(conditionA, conditionB) {
  ol.format.ogc.filter.LogicalBinary.call(this, 'Or', conditionA, conditionB);
};
ol.inherits(ol.format.ogc.filter.Or, ol.format.ogc.filter.LogicalBinary);

goog.provide('ol.format.ogc.filter.Within');

goog.require('ol');
goog.require('ol.format.ogc.filter.Spatial');


/**
 * @classdesc
 * Represents a `<Within>` operator to test whether a geometry-valued property
 * is within a given geometry.
 *
 * @constructor
 * @param {!string} geometryName Geometry name to use.
 * @param {!ol.geom.Geometry} geometry Geometry.
 * @param {string=} opt_srsName SRS name. No srsName attribute will be
 *    set on geometries when this is not provided.
 * @extends {ol.format.ogc.filter.Spatial}
 * @api
 */
ol.format.ogc.filter.Within = function(geometryName, geometry, opt_srsName) {

  ol.format.ogc.filter.Spatial.call(this, 'Within', geometryName, geometry, opt_srsName);

};
ol.inherits(ol.format.ogc.filter.Within, ol.format.ogc.filter.Spatial);

goog.provide('ol.format.ogc.filter');

goog.require('ol');
goog.require('ol.format.ogc.filter.And');
goog.require('ol.format.ogc.filter.Bbox');
goog.require('ol.format.ogc.filter.EqualTo');
goog.require('ol.format.ogc.filter.GreaterThan');
goog.require('ol.format.ogc.filter.GreaterThanOrEqualTo');
goog.require('ol.format.ogc.filter.Intersects');
goog.require('ol.format.ogc.filter.IsBetween');
goog.require('ol.format.ogc.filter.IsLike');
goog.require('ol.format.ogc.filter.IsNull');
goog.require('ol.format.ogc.filter.LessThan');
goog.require('ol.format.ogc.filter.LessThanOrEqualTo');
goog.require('ol.format.ogc.filter.Not');
goog.require('ol.format.ogc.filter.NotEqualTo');
goog.require('ol.format.ogc.filter.Or');
goog.require('ol.format.ogc.filter.Within');


/**
 * Create a logical `<And>` operator between two filter conditions.
 *
 * @param {!ol.format.ogc.filter.Filter} conditionA First filter condition.
 * @param {!ol.format.ogc.filter.Filter} conditionB Second filter condition.
 * @returns {!ol.format.ogc.filter.And} `<And>` operator.
 * @api
 */
ol.format.ogc.filter.and = function(conditionA, conditionB) {
  return new ol.format.ogc.filter.And(conditionA, conditionB);
};


/**
 * Create a logical `<Or>` operator between two filter conditions.
 *
 * @param {!ol.format.ogc.filter.Filter} conditionA First filter condition.
 * @param {!ol.format.ogc.filter.Filter} conditionB Second filter condition.
 * @returns {!ol.format.ogc.filter.Or} `<Or>` operator.
 * @api
 */
ol.format.ogc.filter.or = function(conditionA, conditionB) {
  return new ol.format.ogc.filter.Or(conditionA, conditionB);
};


/**
 * Represents a logical `<Not>` operator for a filter condition.
 *
 * @param {!ol.format.ogc.filter.Filter} condition Filter condition.
 * @returns {!ol.format.ogc.filter.Not} `<Not>` operator.
 * @api
 */
ol.format.ogc.filter.not = function(condition) {
  return new ol.format.ogc.filter.Not(condition);
};


/**
 * Create a `<BBOX>` operator to test whether a geometry-valued property
 * intersects a fixed bounding box
 *
 * @param {!string} geometryName Geometry name to use.
 * @param {!ol.Extent} extent Extent.
 * @param {string=} opt_srsName SRS name. No srsName attribute will be
 *    set on geometries when this is not provided.
 * @returns {!ol.format.ogc.filter.Bbox} `<BBOX>` operator.
 * @api
 */
ol.format.ogc.filter.bbox = function(geometryName, extent, opt_srsName) {
  return new ol.format.ogc.filter.Bbox(geometryName, extent, opt_srsName);
};

/**
 * Create a `<Intersects>` operator to test whether a geometry-valued property
 * intersects a given geometry.
 *
 * @param {!string} geometryName Geometry name to use.
 * @param {!ol.geom.Geometry} geometry Geometry.
 * @param {string=} opt_srsName SRS name. No srsName attribute will be
 *    set on geometries when this is not provided.
 * @returns {!ol.format.ogc.filter.Intersects} `<Intersects>` operator.
 * @api
 */
ol.format.ogc.filter.intersects = function(geometryName, geometry, opt_srsName) {
  return new ol.format.ogc.filter.Intersects(geometryName, geometry, opt_srsName);
};

/**
 * Create a `<Within>` operator to test whether a geometry-valued property
 * is within a given geometry.
 *
 * @param {!string} geometryName Geometry name to use.
 * @param {!ol.geom.Geometry} geometry Geometry.
 * @param {string=} opt_srsName SRS name. No srsName attribute will be
 *    set on geometries when this is not provided.
 * @returns {!ol.format.ogc.filter.Within} `<Within>` operator.
 * @api
 */
ol.format.ogc.filter.within = function(geometryName, geometry, opt_srsName) {
  return new ol.format.ogc.filter.Within(geometryName, geometry, opt_srsName);
};


/**
 * Creates a `<PropertyIsEqualTo>` comparison operator.
 *
 * @param {!string} propertyName Name of the context property to compare.
 * @param {!(string|number)} expression The value to compare.
 * @param {boolean=} opt_matchCase Case-sensitive?
 * @returns {!ol.format.ogc.filter.EqualTo} `<PropertyIsEqualTo>` operator.
 * @api
 */
ol.format.ogc.filter.equalTo = function(propertyName, expression, opt_matchCase) {
  return new ol.format.ogc.filter.EqualTo(propertyName, expression, opt_matchCase);
};


/**
 * Creates a `<PropertyIsNotEqualTo>` comparison operator.
 *
 * @param {!string} propertyName Name of the context property to compare.
 * @param {!(string|number)} expression The value to compare.
 * @param {boolean=} opt_matchCase Case-sensitive?
 * @returns {!ol.format.ogc.filter.NotEqualTo} `<PropertyIsNotEqualTo>` operator.
 * @api
 */
ol.format.ogc.filter.notEqualTo = function(propertyName, expression, opt_matchCase) {
  return new ol.format.ogc.filter.NotEqualTo(propertyName, expression, opt_matchCase);
};


/**
 * Creates a `<PropertyIsLessThan>` comparison operator.
 *
 * @param {!string} propertyName Name of the context property to compare.
 * @param {!number} expression The value to compare.
 * @returns {!ol.format.ogc.filter.LessThan} `<PropertyIsLessThan>` operator.
 * @api
 */
ol.format.ogc.filter.lessThan = function(propertyName, expression) {
  return new ol.format.ogc.filter.LessThan(propertyName, expression);
};


/**
 * Creates a `<PropertyIsLessThanOrEqualTo>` comparison operator.
 *
 * @param {!string} propertyName Name of the context property to compare.
 * @param {!number} expression The value to compare.
 * @returns {!ol.format.ogc.filter.LessThanOrEqualTo} `<PropertyIsLessThanOrEqualTo>` operator.
 * @api
 */
ol.format.ogc.filter.lessThanOrEqualTo = function(propertyName, expression) {
  return new ol.format.ogc.filter.LessThanOrEqualTo(propertyName, expression);
};


/**
 * Creates a `<PropertyIsGreaterThan>` comparison operator.
 *
 * @param {!string} propertyName Name of the context property to compare.
 * @param {!number} expression The value to compare.
 * @returns {!ol.format.ogc.filter.GreaterThan} `<PropertyIsGreaterThan>` operator.
 * @api
 */
ol.format.ogc.filter.greaterThan = function(propertyName, expression) {
  return new ol.format.ogc.filter.GreaterThan(propertyName, expression);
};


/**
 * Creates a `<PropertyIsGreaterThanOrEqualTo>` comparison operator.
 *
 * @param {!string} propertyName Name of the context property to compare.
 * @param {!number} expression The value to compare.
 * @returns {!ol.format.ogc.filter.GreaterThanOrEqualTo} `<PropertyIsGreaterThanOrEqualTo>` operator.
 * @api
 */
ol.format.ogc.filter.greaterThanOrEqualTo = function(propertyName, expression) {
  return new ol.format.ogc.filter.GreaterThanOrEqualTo(propertyName, expression);
};


/**
 * Creates a `<PropertyIsNull>` comparison operator to test whether a property value
 * is null.
 *
 * @param {!string} propertyName Name of the context property to compare.
 * @returns {!ol.format.ogc.filter.IsNull} `<PropertyIsNull>` operator.
 * @api
 */
ol.format.ogc.filter.isNull = function(propertyName) {
  return new ol.format.ogc.filter.IsNull(propertyName);
};


/**
 * Creates a `<PropertyIsBetween>` comparison operator to test whether an expression
 * value lies within a range given by a lower and upper bound (inclusive).
 *
 * @param {!string} propertyName Name of the context property to compare.
 * @param {!number} lowerBoundary The lower bound of the range.
 * @param {!number} upperBoundary The upper bound of the range.
 * @returns {!ol.format.ogc.filter.IsBetween} `<PropertyIsBetween>` operator.
 * @api
 */
ol.format.ogc.filter.between = function(propertyName, lowerBoundary, upperBoundary) {
  return new ol.format.ogc.filter.IsBetween(propertyName, lowerBoundary, upperBoundary);
};


/**
 * Represents a `<PropertyIsLike>` comparison operator that matches a string property
 * value against a text pattern.
 *
 * @param {!string} propertyName Name of the context property to compare.
 * @param {!string} pattern Text pattern.
 * @param {string=} opt_wildCard Pattern character which matches any sequence of
 *    zero or more string characters. Default is '*'.
 * @param {string=} opt_singleChar pattern character which matches any single
 *    string character. Default is '.'.
 * @param {string=} opt_escapeChar Escape character which can be used to escape
 *    the pattern characters. Default is '!'.
 * @param {boolean=} opt_matchCase Case-sensitive?
 * @returns {!ol.format.ogc.filter.IsLike} `<PropertyIsLike>` operator.
 * @api
 */
ol.format.ogc.filter.like = function(propertyName, pattern,
    opt_wildCard, opt_singleChar, opt_escapeChar, opt_matchCase) {
  return new ol.format.ogc.filter.IsLike(propertyName, pattern,
    opt_wildCard, opt_singleChar, opt_escapeChar, opt_matchCase);
};

// FIXME add typedef for stack state objects
goog.provide('ol.format.OSMXML');

goog.require('ol');
goog.require('ol.array');
goog.require('ol.Feature');
goog.require('ol.format.Feature');
goog.require('ol.format.XMLFeature');
goog.require('ol.geom.GeometryLayout');
goog.require('ol.geom.LineString');
goog.require('ol.geom.Point');
goog.require('ol.geom.Polygon');
goog.require('ol.obj');
goog.require('ol.proj');
goog.require('ol.xml');


/**
 * @classdesc
 * Feature format for reading data in the
 * [OSMXML format](http://wiki.openstreetmap.org/wiki/OSM_XML).
 *
 * @constructor
 * @extends {ol.format.XMLFeature}
 * @api stable
 */
ol.format.OSMXML = function() {
  ol.format.XMLFeature.call(this);

  /**
   * @inheritDoc
   */
  this.defaultDataProjection = ol.proj.get('EPSG:4326');
};
ol.inherits(ol.format.OSMXML, ol.format.XMLFeature);


/**
 * @const
 * @type {Array.<string>}
 * @private
 */
ol.format.OSMXML.EXTENSIONS_ = ['.osm'];


/**
 * @inheritDoc
 */
ol.format.OSMXML.prototype.getExtensions = function() {
  return ol.format.OSMXML.EXTENSIONS_;
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.OSMXML.readNode_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'node', 'localName should be node');
  var options = /** @type {olx.format.ReadOptions} */ (objectStack[0]);
  var state = /** @type {Object} */ (objectStack[objectStack.length - 1]);
  var id = node.getAttribute('id');
  /** @type {ol.Coordinate} */
  var coordinates = [
    parseFloat(node.getAttribute('lon')),
    parseFloat(node.getAttribute('lat'))
  ];
  state.nodes[id] = coordinates;

  var values = ol.xml.pushParseAndPop({
    tags: {}
  }, ol.format.OSMXML.NODE_PARSERS_, node, objectStack);
  if (!ol.obj.isEmpty(values.tags)) {
    var geometry = new ol.geom.Point(coordinates);
    ol.format.Feature.transformWithOptions(geometry, false, options);
    var feature = new ol.Feature(geometry);
    feature.setId(id);
    feature.setProperties(values.tags);
    state.features.push(feature);
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.OSMXML.readWay_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'way', 'localName should be way');
  var options = /** @type {olx.format.ReadOptions} */ (objectStack[0]);
  var id = node.getAttribute('id');
  var values = ol.xml.pushParseAndPop({
    ndrefs: [],
    tags: {}
  }, ol.format.OSMXML.WAY_PARSERS_, node, objectStack);
  var state = /** @type {Object} */ (objectStack[objectStack.length - 1]);
  /** @type {Array.<number>} */
  var flatCoordinates = [];
  for (var i = 0, ii = values.ndrefs.length; i < ii; i++) {
    var point = state.nodes[values.ndrefs[i]];
    ol.array.extend(flatCoordinates, point);
  }
  var geometry;
  if (values.ndrefs[0] == values.ndrefs[values.ndrefs.length - 1]) {
    // closed way
    geometry = new ol.geom.Polygon(null);
    geometry.setFlatCoordinates(ol.geom.GeometryLayout.XY, flatCoordinates,
        [flatCoordinates.length]);
  } else {
    geometry = new ol.geom.LineString(null);
    geometry.setFlatCoordinates(ol.geom.GeometryLayout.XY, flatCoordinates);
  }
  ol.format.Feature.transformWithOptions(geometry, false, options);
  var feature = new ol.Feature(geometry);
  feature.setId(id);
  feature.setProperties(values.tags);
  state.features.push(feature);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.OSMXML.readNd_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'nd', 'localName should be nd');
  var values = /** @type {Object} */ (objectStack[objectStack.length - 1]);
  values.ndrefs.push(node.getAttribute('ref'));
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.OSMXML.readTag_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'tag', 'localName should be tag');
  var values = /** @type {Object} */ (objectStack[objectStack.length - 1]);
  values.tags[node.getAttribute('k')] = node.getAttribute('v');
};


/**
 * @const
 * @private
 * @type {Array.<string>}
 */
ol.format.OSMXML.NAMESPACE_URIS_ = [
  null
];


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.OSMXML.WAY_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.OSMXML.NAMESPACE_URIS_, {
      'nd': ol.format.OSMXML.readNd_,
      'tag': ol.format.OSMXML.readTag_
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.OSMXML.PARSERS_ = ol.xml.makeStructureNS(
    ol.format.OSMXML.NAMESPACE_URIS_, {
      'node': ol.format.OSMXML.readNode_,
      'way': ol.format.OSMXML.readWay_
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.OSMXML.NODE_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.OSMXML.NAMESPACE_URIS_, {
      'tag': ol.format.OSMXML.readTag_
    });


/**
 * Read all features from an OSM source.
 *
 * @function
 * @param {Document|Node|Object|string} source Source.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @return {Array.<ol.Feature>} Features.
 * @api stable
 */
ol.format.OSMXML.prototype.readFeatures;


/**
 * @inheritDoc
 */
ol.format.OSMXML.prototype.readFeaturesFromNode = function(node, opt_options) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  var options = this.getReadOptions(node, opt_options);
  if (node.localName == 'osm') {
    var state = ol.xml.pushParseAndPop({
      nodes: {},
      features: []
    }, ol.format.OSMXML.PARSERS_, node, [options]);
    if (state.features) {
      return state.features;
    }
  }
  return [];
};


/**
 * Read the projection from an OSM source.
 *
 * @function
 * @param {Document|Node|Object|string} source Source.
 * @return {ol.proj.Projection} Projection.
 * @api stable
 */
ol.format.OSMXML.prototype.readProjection;

goog.provide('ol.format.XLink');


/**
 * @const
 * @type {string}
 */
ol.format.XLink.NAMESPACE_URI = 'http://www.w3.org/1999/xlink';


/**
 * @param {Node} node Node.
 * @return {boolean|undefined} Boolean.
 */
ol.format.XLink.readHref = function(node) {
  return node.getAttributeNS(ol.format.XLink.NAMESPACE_URI, 'href');
};

goog.provide('ol.format.XML');

goog.require('ol.xml');


/**
 * @classdesc
 * Generic format for reading non-feature XML data
 *
 * @constructor
 * @struct
 */
ol.format.XML = function() {
};


/**
 * @param {Document|Node|string} source Source.
 * @return {Object} The parsed result.
 */
ol.format.XML.prototype.read = function(source) {
  if (ol.xml.isDocument(source)) {
    return this.readFromDocument(/** @type {Document} */ (source));
  } else if (ol.xml.isNode(source)) {
    return this.readFromNode(/** @type {Node} */ (source));
  } else if (typeof source === 'string') {
    var doc = ol.xml.parse(source);
    return this.readFromDocument(doc);
  } else {
    return null;
  }
};


/**
 * @abstract
 * @param {Document} doc Document.
 * @return {Object} Object
 */
ol.format.XML.prototype.readFromDocument = function(doc) {};


/**
 * @abstract
 * @param {Node} node Node.
 * @return {Object} Object
 */
ol.format.XML.prototype.readFromNode = function(node) {};

goog.provide('ol.format.OWS');

goog.require('ol');
goog.require('ol.format.XLink');
goog.require('ol.format.XML');
goog.require('ol.format.XSD');
goog.require('ol.xml');


/**
 * @constructor
 * @extends {ol.format.XML}
 */
ol.format.OWS = function() {
  ol.format.XML.call(this);
};
ol.inherits(ol.format.OWS, ol.format.XML);


/**
 * @param {Document} doc Document.
 * @return {Object} OWS object.
 */
ol.format.OWS.prototype.readFromDocument = function(doc) {
  goog.DEBUG && console.assert(doc.nodeType == Node.DOCUMENT_NODE,
      'doc.nodeType should be DOCUMENT');
  for (var n = doc.firstChild; n; n = n.nextSibling) {
    if (n.nodeType == Node.ELEMENT_NODE) {
      return this.readFromNode(n);
    }
  }
  return null;
};


/**
 * @param {Node} node Node.
 * @return {Object} OWS object.
 */
ol.format.OWS.prototype.readFromNode = function(node) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  var owsObject = ol.xml.pushParseAndPop({},
      ol.format.OWS.PARSERS_, node, []);
  return owsObject ? owsObject : null;
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Object|undefined} The address.
 */
ol.format.OWS.readAddress_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Address',
      'localName should be Address');
  return ol.xml.pushParseAndPop({},
      ol.format.OWS.ADDRESS_PARSERS_, node, objectStack);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Object|undefined} The values.
 */
ol.format.OWS.readAllowedValues_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'AllowedValues',
      'localName should be AllowedValues');
  return ol.xml.pushParseAndPop({},
      ol.format.OWS.ALLOWED_VALUES_PARSERS_, node, objectStack);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Object|undefined} The constraint.
 */
ol.format.OWS.readConstraint_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Constraint',
      'localName should be Constraint');
  var name = node.getAttribute('name');
  if (!name) {
    return undefined;
  }
  return ol.xml.pushParseAndPop({'name': name},
      ol.format.OWS.CONSTRAINT_PARSERS_, node,
      objectStack);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Object|undefined} The contact info.
 */
ol.format.OWS.readContactInfo_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'ContactInfo',
      'localName should be ContactInfo');
  return ol.xml.pushParseAndPop({},
      ol.format.OWS.CONTACT_INFO_PARSERS_, node, objectStack);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Object|undefined} The DCP.
 */
ol.format.OWS.readDcp_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'DCP', 'localName should be DCP');
  return ol.xml.pushParseAndPop({},
      ol.format.OWS.DCP_PARSERS_, node, objectStack);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Object|undefined} The GET object.
 */
ol.format.OWS.readGet_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Get', 'localName should be Get');
  var href = ol.format.XLink.readHref(node);
  if (!href) {
    return undefined;
  }
  return ol.xml.pushParseAndPop({'href': href},
      ol.format.OWS.REQUEST_METHOD_PARSERS_, node, objectStack);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Object|undefined} The HTTP object.
 */
ol.format.OWS.readHttp_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'HTTP', 'localName should be HTTP');
  return ol.xml.pushParseAndPop({}, ol.format.OWS.HTTP_PARSERS_,
      node, objectStack);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Object|undefined} The operation.
 */
ol.format.OWS.readOperation_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Operation',
      'localName should be Operation');
  var name = node.getAttribute('name');
  var value = ol.xml.pushParseAndPop({},
      ol.format.OWS.OPERATION_PARSERS_, node, objectStack);
  if (!value) {
    return undefined;
  }
  var object = /** @type {Object} */
      (objectStack[objectStack.length - 1]);
  object[name] = value;

};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Object|undefined} The operations metadata.
 */
ol.format.OWS.readOperationsMetadata_ = function(node,
    objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'OperationsMetadata',
      'localName should be OperationsMetadata');
  return ol.xml.pushParseAndPop({},
      ol.format.OWS.OPERATIONS_METADATA_PARSERS_, node,
      objectStack);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Object|undefined} The phone.
 */
ol.format.OWS.readPhone_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Phone', 'localName should be Phone');
  return ol.xml.pushParseAndPop({},
      ol.format.OWS.PHONE_PARSERS_, node, objectStack);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Object|undefined} The service identification.
 */
ol.format.OWS.readServiceIdentification_ = function(node,
    objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'ServiceIdentification',
      'localName should be ServiceIdentification');
  return ol.xml.pushParseAndPop(
      {}, ol.format.OWS.SERVICE_IDENTIFICATION_PARSERS_, node,
      objectStack);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Object|undefined} The service contact.
 */
ol.format.OWS.readServiceContact_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'ServiceContact',
      'localName should be ServiceContact');
  return ol.xml.pushParseAndPop(
      {}, ol.format.OWS.SERVICE_CONTACT_PARSERS_, node,
      objectStack);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Object|undefined} The service provider.
 */
ol.format.OWS.readServiceProvider_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'ServiceProvider',
      'localName should be ServiceProvider');
  return ol.xml.pushParseAndPop(
      {}, ol.format.OWS.SERVICE_PROVIDER_PARSERS_, node,
      objectStack);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {string|undefined} The value.
 */
ol.format.OWS.readValue_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Value', 'localName should be Value');
  return ol.format.XSD.readString(node);
};


/**
 * @const
 * @type {Array.<string>}
 * @private
 */
ol.format.OWS.NAMESPACE_URIS_ = [
  null,
  'http://www.opengis.net/ows/1.1'
];


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.OWS.PARSERS_ = ol.xml.makeStructureNS(
    ol.format.OWS.NAMESPACE_URIS_, {
      'ServiceIdentification': ol.xml.makeObjectPropertySetter(
          ol.format.OWS.readServiceIdentification_),
      'ServiceProvider': ol.xml.makeObjectPropertySetter(
          ol.format.OWS.readServiceProvider_),
      'OperationsMetadata': ol.xml.makeObjectPropertySetter(
          ol.format.OWS.readOperationsMetadata_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.OWS.ADDRESS_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.OWS.NAMESPACE_URIS_, {
      'DeliveryPoint': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readString),
      'City': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'AdministrativeArea': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readString),
      'PostalCode': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'Country': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'ElectronicMailAddress': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readString)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.OWS.ALLOWED_VALUES_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.OWS.NAMESPACE_URIS_, {
      'Value': ol.xml.makeObjectPropertyPusher(ol.format.OWS.readValue_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.OWS.CONSTRAINT_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.OWS.NAMESPACE_URIS_, {
      'AllowedValues': ol.xml.makeObjectPropertySetter(
          ol.format.OWS.readAllowedValues_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.OWS.CONTACT_INFO_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.OWS.NAMESPACE_URIS_, {
      'Phone': ol.xml.makeObjectPropertySetter(ol.format.OWS.readPhone_),
      'Address': ol.xml.makeObjectPropertySetter(ol.format.OWS.readAddress_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.OWS.DCP_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.OWS.NAMESPACE_URIS_, {
      'HTTP': ol.xml.makeObjectPropertySetter(ol.format.OWS.readHttp_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.OWS.HTTP_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.OWS.NAMESPACE_URIS_, {
      'Get': ol.xml.makeObjectPropertyPusher(ol.format.OWS.readGet_),
      'Post': undefined // TODO
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.OWS.OPERATION_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.OWS.NAMESPACE_URIS_, {
      'DCP': ol.xml.makeObjectPropertySetter(ol.format.OWS.readDcp_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.OWS.OPERATIONS_METADATA_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.OWS.NAMESPACE_URIS_, {
      'Operation': ol.format.OWS.readOperation_
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.OWS.PHONE_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.OWS.NAMESPACE_URIS_, {
      'Voice': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'Facsimile': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.OWS.REQUEST_METHOD_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.OWS.NAMESPACE_URIS_, {
      'Constraint': ol.xml.makeObjectPropertyPusher(
          ol.format.OWS.readConstraint_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.OWS.SERVICE_CONTACT_PARSERS_ =
    ol.xml.makeStructureNS(
    ol.format.OWS.NAMESPACE_URIS_, {
      'IndividualName': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readString),
      'PositionName': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'ContactInfo': ol.xml.makeObjectPropertySetter(
          ol.format.OWS.readContactInfo_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.OWS.SERVICE_IDENTIFICATION_PARSERS_ =
    ol.xml.makeStructureNS(
    ol.format.OWS.NAMESPACE_URIS_, {
      'Title': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'ServiceTypeVersion': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readString),
      'ServiceType': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.OWS.SERVICE_PROVIDER_PARSERS_ =
    ol.xml.makeStructureNS(
    ol.format.OWS.NAMESPACE_URIS_, {
      'ProviderName': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'ProviderSite': ol.xml.makeObjectPropertySetter(ol.format.XLink.readHref),
      'ServiceContact': ol.xml.makeObjectPropertySetter(
          ol.format.OWS.readServiceContact_)
    });

goog.provide('ol.geom.flat.flip');


/**
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @param {Array.<number>=} opt_dest Destination.
 * @param {number=} opt_destOffset Destination offset.
 * @return {Array.<number>} Flat coordinates.
 */
ol.geom.flat.flip.flipXY = function(flatCoordinates, offset, end, stride, opt_dest, opt_destOffset) {
  var dest, destOffset;
  if (opt_dest !== undefined) {
    dest = opt_dest;
    destOffset = opt_destOffset !== undefined ? opt_destOffset : 0;
  } else {
    dest = [];
    destOffset = 0;
  }
  var j = offset;
  while (j < end) {
    var x = flatCoordinates[j++];
    dest[destOffset++] = flatCoordinates[j++];
    dest[destOffset++] = x;
    for (var k = 2; k < stride; ++k) {
      dest[destOffset++] = flatCoordinates[j++];
    }
  }
  dest.length = destOffset;
  return dest;
};

goog.provide('ol.format.Polyline');

goog.require('ol');
goog.require('ol.asserts');
goog.require('ol.Feature');
goog.require('ol.format.Feature');
goog.require('ol.format.TextFeature');
goog.require('ol.geom.GeometryLayout');
goog.require('ol.geom.LineString');
goog.require('ol.geom.SimpleGeometry');
goog.require('ol.geom.flat.flip');
goog.require('ol.geom.flat.inflate');
goog.require('ol.proj');


/**
 * @classdesc
 * Feature format for reading and writing data in the Encoded
 * Polyline Algorithm Format.
 *
 * @constructor
 * @extends {ol.format.TextFeature}
 * @param {olx.format.PolylineOptions=} opt_options
 *     Optional configuration object.
 * @api stable
 */
ol.format.Polyline = function(opt_options) {

  var options = opt_options ? opt_options : {};

  ol.format.TextFeature.call(this);

  /**
   * @inheritDoc
   */
  this.defaultDataProjection = ol.proj.get('EPSG:4326');

  /**
   * @private
   * @type {number}
   */
  this.factor_ = options.factor ? options.factor : 1e5;

  /**
   * @private
   * @type {ol.geom.GeometryLayout}
   */
  this.geometryLayout_ = options.geometryLayout ?
      options.geometryLayout : ol.geom.GeometryLayout.XY;
};
ol.inherits(ol.format.Polyline, ol.format.TextFeature);


/**
 * Encode a list of n-dimensional points and return an encoded string
 *
 * Attention: This function will modify the passed array!
 *
 * @param {Array.<number>} numbers A list of n-dimensional points.
 * @param {number} stride The number of dimension of the points in the list.
 * @param {number=} opt_factor The factor by which the numbers will be
 *     multiplied. The remaining decimal places will get rounded away.
 *     Default is `1e5`.
 * @return {string} The encoded string.
 * @api
 */
ol.format.Polyline.encodeDeltas = function(numbers, stride, opt_factor) {
  var factor = opt_factor ? opt_factor : 1e5;
  var d;

  var lastNumbers = new Array(stride);
  for (d = 0; d < stride; ++d) {
    lastNumbers[d] = 0;
  }

  var i, ii;
  for (i = 0, ii = numbers.length; i < ii;) {
    for (d = 0; d < stride; ++d, ++i) {
      var num = numbers[i];
      var delta = num - lastNumbers[d];
      lastNumbers[d] = num;

      numbers[i] = delta;
    }
  }

  return ol.format.Polyline.encodeFloats(numbers, factor);
};


/**
 * Decode a list of n-dimensional points from an encoded string
 *
 * @param {string} encoded An encoded string.
 * @param {number} stride The number of dimension of the points in the
 *     encoded string.
 * @param {number=} opt_factor The factor by which the resulting numbers will
 *     be divided. Default is `1e5`.
 * @return {Array.<number>} A list of n-dimensional points.
 * @api
 */
ol.format.Polyline.decodeDeltas = function(encoded, stride, opt_factor) {
  var factor = opt_factor ? opt_factor : 1e5;
  var d;

  /** @type {Array.<number>} */
  var lastNumbers = new Array(stride);
  for (d = 0; d < stride; ++d) {
    lastNumbers[d] = 0;
  }

  var numbers = ol.format.Polyline.decodeFloats(encoded, factor);

  var i, ii;
  for (i = 0, ii = numbers.length; i < ii;) {
    for (d = 0; d < stride; ++d, ++i) {
      lastNumbers[d] += numbers[i];

      numbers[i] = lastNumbers[d];
    }
  }

  return numbers;
};


/**
 * Encode a list of floating point numbers and return an encoded string
 *
 * Attention: This function will modify the passed array!
 *
 * @param {Array.<number>} numbers A list of floating point numbers.
 * @param {number=} opt_factor The factor by which the numbers will be
 *     multiplied. The remaining decimal places will get rounded away.
 *     Default is `1e5`.
 * @return {string} The encoded string.
 * @api
 */
ol.format.Polyline.encodeFloats = function(numbers, opt_factor) {
  var factor = opt_factor ? opt_factor : 1e5;
  var i, ii;
  for (i = 0, ii = numbers.length; i < ii; ++i) {
    numbers[i] = Math.round(numbers[i] * factor);
  }

  return ol.format.Polyline.encodeSignedIntegers(numbers);
};


/**
 * Decode a list of floating point numbers from an encoded string
 *
 * @param {string} encoded An encoded string.
 * @param {number=} opt_factor The factor by which the result will be divided.
 *     Default is `1e5`.
 * @return {Array.<number>} A list of floating point numbers.
 * @api
 */
ol.format.Polyline.decodeFloats = function(encoded, opt_factor) {
  var factor = opt_factor ? opt_factor : 1e5;
  var numbers = ol.format.Polyline.decodeSignedIntegers(encoded);
  var i, ii;
  for (i = 0, ii = numbers.length; i < ii; ++i) {
    numbers[i] /= factor;
  }
  return numbers;
};


/**
 * Encode a list of signed integers and return an encoded string
 *
 * Attention: This function will modify the passed array!
 *
 * @param {Array.<number>} numbers A list of signed integers.
 * @return {string} The encoded string.
 */
ol.format.Polyline.encodeSignedIntegers = function(numbers) {
  var i, ii;
  for (i = 0, ii = numbers.length; i < ii; ++i) {
    var num = numbers[i];
    numbers[i] = (num < 0) ? ~(num << 1) : (num << 1);
  }
  return ol.format.Polyline.encodeUnsignedIntegers(numbers);
};


/**
 * Decode a list of signed integers from an encoded string
 *
 * @param {string} encoded An encoded string.
 * @return {Array.<number>} A list of signed integers.
 */
ol.format.Polyline.decodeSignedIntegers = function(encoded) {
  var numbers = ol.format.Polyline.decodeUnsignedIntegers(encoded);
  var i, ii;
  for (i = 0, ii = numbers.length; i < ii; ++i) {
    var num = numbers[i];
    numbers[i] = (num & 1) ? ~(num >> 1) : (num >> 1);
  }
  return numbers;
};


/**
 * Encode a list of unsigned integers and return an encoded string
 *
 * @param {Array.<number>} numbers A list of unsigned integers.
 * @return {string} The encoded string.
 */
ol.format.Polyline.encodeUnsignedIntegers = function(numbers) {
  var encoded = '';
  var i, ii;
  for (i = 0, ii = numbers.length; i < ii; ++i) {
    encoded += ol.format.Polyline.encodeUnsignedInteger(numbers[i]);
  }
  return encoded;
};


/**
 * Decode a list of unsigned integers from an encoded string
 *
 * @param {string} encoded An encoded string.
 * @return {Array.<number>} A list of unsigned integers.
 */
ol.format.Polyline.decodeUnsignedIntegers = function(encoded) {
  var numbers = [];
  var current = 0;
  var shift = 0;
  var i, ii;
  for (i = 0, ii = encoded.length; i < ii; ++i) {
    var b = encoded.charCodeAt(i) - 63;
    current |= (b & 0x1f) << shift;
    if (b < 0x20) {
      numbers.push(current);
      current = 0;
      shift = 0;
    } else {
      shift += 5;
    }
  }
  return numbers;
};


/**
 * Encode one single unsigned integer and return an encoded string
 *
 * @param {number} num Unsigned integer that should be encoded.
 * @return {string} The encoded string.
 */
ol.format.Polyline.encodeUnsignedInteger = function(num) {
  var value, encoded = '';
  while (num >= 0x20) {
    value = (0x20 | (num & 0x1f)) + 63;
    encoded += String.fromCharCode(value);
    num >>= 5;
  }
  value = num + 63;
  encoded += String.fromCharCode(value);
  return encoded;
};


/**
 * Read the feature from the Polyline source. The coordinates are assumed to be
 * in two dimensions and in latitude, longitude order.
 *
 * @function
 * @param {Document|Node|Object|string} source Source.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @return {ol.Feature} Feature.
 * @api stable
 */
ol.format.Polyline.prototype.readFeature;


/**
 * @inheritDoc
 */
ol.format.Polyline.prototype.readFeatureFromText = function(text, opt_options) {
  var geometry = this.readGeometryFromText(text, opt_options);
  return new ol.Feature(geometry);
};


/**
 * Read the feature from the source. As Polyline sources contain a single
 * feature, this will return the feature in an array.
 *
 * @function
 * @param {Document|Node|Object|string} source Source.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @return {Array.<ol.Feature>} Features.
 * @api stable
 */
ol.format.Polyline.prototype.readFeatures;


/**
 * @inheritDoc
 */
ol.format.Polyline.prototype.readFeaturesFromText = function(text, opt_options) {
  var feature = this.readFeatureFromText(text, opt_options);
  return [feature];
};


/**
 * Read the geometry from the source.
 *
 * @function
 * @param {Document|Node|Object|string} source Source.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @return {ol.geom.Geometry} Geometry.
 * @api stable
 */
ol.format.Polyline.prototype.readGeometry;


/**
 * @inheritDoc
 */
ol.format.Polyline.prototype.readGeometryFromText = function(text, opt_options) {
  var stride = ol.geom.SimpleGeometry.getStrideForLayout(this.geometryLayout_);
  var flatCoordinates = ol.format.Polyline.decodeDeltas(
      text, stride, this.factor_);
  ol.geom.flat.flip.flipXY(
      flatCoordinates, 0, flatCoordinates.length, stride, flatCoordinates);
  var coordinates = ol.geom.flat.inflate.coordinates(
      flatCoordinates, 0, flatCoordinates.length, stride);

  return /** @type {ol.geom.Geometry} */ (
      ol.format.Feature.transformWithOptions(
          new ol.geom.LineString(coordinates, this.geometryLayout_), false,
          this.adaptOptions(opt_options)));
};


/**
 * Read the projection from a Polyline source.
 *
 * @function
 * @param {Document|Node|Object|string} source Source.
 * @return {ol.proj.Projection} Projection.
 * @api stable
 */
ol.format.Polyline.prototype.readProjection;


/**
 * @inheritDoc
 */
ol.format.Polyline.prototype.writeFeatureText = function(feature, opt_options) {
  var geometry = feature.getGeometry();
  if (geometry) {
    return this.writeGeometryText(geometry, opt_options);
  } else {
    ol.asserts.assert(false, 40); // Expected `feature` to have a geometry
    return '';
  }
};


/**
 * @inheritDoc
 */
ol.format.Polyline.prototype.writeFeaturesText = function(features, opt_options) {
  goog.DEBUG && console.assert(features.length == 1,
      'features array should have 1 item');
  return this.writeFeatureText(features[0], opt_options);
};


/**
 * Write a single geometry in Polyline format.
 *
 * @function
 * @param {ol.geom.Geometry} geometry Geometry.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @return {string} Geometry.
 * @api stable
 */
ol.format.Polyline.prototype.writeGeometry;


/**
 * @inheritDoc
 */
ol.format.Polyline.prototype.writeGeometryText = function(geometry, opt_options) {
  geometry = /** @type {ol.geom.LineString} */
      (ol.format.Feature.transformWithOptions(
          geometry, true, this.adaptOptions(opt_options)));
  var flatCoordinates = geometry.getFlatCoordinates();
  var stride = geometry.getStride();
  ol.geom.flat.flip.flipXY(
      flatCoordinates, 0, flatCoordinates.length, stride, flatCoordinates);
  return ol.format.Polyline.encodeDeltas(flatCoordinates, stride, this.factor_);
};

goog.provide('ol.format.TopoJSON');

goog.require('ol');
goog.require('ol.Feature');
goog.require('ol.format.Feature');
goog.require('ol.format.JSONFeature');
goog.require('ol.geom.LineString');
goog.require('ol.geom.MultiLineString');
goog.require('ol.geom.MultiPoint');
goog.require('ol.geom.MultiPolygon');
goog.require('ol.geom.Point');
goog.require('ol.geom.Polygon');
goog.require('ol.obj');
goog.require('ol.proj');


/**
 * @classdesc
 * Feature format for reading data in the TopoJSON format.
 *
 * @constructor
 * @extends {ol.format.JSONFeature}
 * @param {olx.format.TopoJSONOptions=} opt_options Options.
 * @api stable
 */
ol.format.TopoJSON = function(opt_options) {

  var options = opt_options ? opt_options : {};

  ol.format.JSONFeature.call(this);

  /**
   * @inheritDoc
   */
  this.defaultDataProjection = ol.proj.get(
      options.defaultDataProjection ?
          options.defaultDataProjection : 'EPSG:4326');

};
ol.inherits(ol.format.TopoJSON, ol.format.JSONFeature);


/**
 * @const {Array.<string>}
 * @private
 */
ol.format.TopoJSON.EXTENSIONS_ = ['.topojson'];


/**
 * Concatenate arcs into a coordinate array.
 * @param {Array.<number>} indices Indices of arcs to concatenate.  Negative
 *     values indicate arcs need to be reversed.
 * @param {Array.<Array.<ol.Coordinate>>} arcs Array of arcs (already
 *     transformed).
 * @return {Array.<ol.Coordinate>} Coordinates array.
 * @private
 */
ol.format.TopoJSON.concatenateArcs_ = function(indices, arcs) {
  /** @type {Array.<ol.Coordinate>} */
  var coordinates = [];
  var index, arc;
  var i, ii;
  var j, jj;
  for (i = 0, ii = indices.length; i < ii; ++i) {
    index = indices[i];
    if (i > 0) {
      // splicing together arcs, discard last point
      coordinates.pop();
    }
    if (index >= 0) {
      // forward arc
      arc = arcs[index];
    } else {
      // reverse arc
      arc = arcs[~index].slice().reverse();
    }
    coordinates.push.apply(coordinates, arc);
  }
  // provide fresh copies of coordinate arrays
  for (j = 0, jj = coordinates.length; j < jj; ++j) {
    coordinates[j] = coordinates[j].slice();
  }
  return coordinates;
};


/**
 * Create a point from a TopoJSON geometry object.
 *
 * @param {TopoJSONGeometry} object TopoJSON object.
 * @param {Array.<number>} scale Scale for each dimension.
 * @param {Array.<number>} translate Translation for each dimension.
 * @return {ol.geom.Point} Geometry.
 * @private
 */
ol.format.TopoJSON.readPointGeometry_ = function(object, scale, translate) {
  var coordinates = object.coordinates;
  if (scale && translate) {
    ol.format.TopoJSON.transformVertex_(coordinates, scale, translate);
  }
  return new ol.geom.Point(coordinates);
};


/**
 * Create a multi-point from a TopoJSON geometry object.
 *
 * @param {TopoJSONGeometry} object TopoJSON object.
 * @param {Array.<number>} scale Scale for each dimension.
 * @param {Array.<number>} translate Translation for each dimension.
 * @return {ol.geom.MultiPoint} Geometry.
 * @private
 */
ol.format.TopoJSON.readMultiPointGeometry_ = function(object, scale,
    translate) {
  var coordinates = object.coordinates;
  var i, ii;
  if (scale && translate) {
    for (i = 0, ii = coordinates.length; i < ii; ++i) {
      ol.format.TopoJSON.transformVertex_(coordinates[i], scale, translate);
    }
  }
  return new ol.geom.MultiPoint(coordinates);
};


/**
 * Create a linestring from a TopoJSON geometry object.
 *
 * @param {TopoJSONGeometry} object TopoJSON object.
 * @param {Array.<Array.<ol.Coordinate>>} arcs Array of arcs.
 * @return {ol.geom.LineString} Geometry.
 * @private
 */
ol.format.TopoJSON.readLineStringGeometry_ = function(object, arcs) {
  var coordinates = ol.format.TopoJSON.concatenateArcs_(object.arcs, arcs);
  return new ol.geom.LineString(coordinates);
};


/**
 * Create a multi-linestring from a TopoJSON geometry object.
 *
 * @param {TopoJSONGeometry} object TopoJSON object.
 * @param {Array.<Array.<ol.Coordinate>>} arcs Array of arcs.
 * @return {ol.geom.MultiLineString} Geometry.
 * @private
 */
ol.format.TopoJSON.readMultiLineStringGeometry_ = function(object, arcs) {
  var coordinates = [];
  var i, ii;
  for (i = 0, ii = object.arcs.length; i < ii; ++i) {
    coordinates[i] = ol.format.TopoJSON.concatenateArcs_(object.arcs[i], arcs);
  }
  return new ol.geom.MultiLineString(coordinates);
};


/**
 * Create a polygon from a TopoJSON geometry object.
 *
 * @param {TopoJSONGeometry} object TopoJSON object.
 * @param {Array.<Array.<ol.Coordinate>>} arcs Array of arcs.
 * @return {ol.geom.Polygon} Geometry.
 * @private
 */
ol.format.TopoJSON.readPolygonGeometry_ = function(object, arcs) {
  var coordinates = [];
  var i, ii;
  for (i = 0, ii = object.arcs.length; i < ii; ++i) {
    coordinates[i] = ol.format.TopoJSON.concatenateArcs_(object.arcs[i], arcs);
  }
  return new ol.geom.Polygon(coordinates);
};


/**
 * Create a multi-polygon from a TopoJSON geometry object.
 *
 * @param {TopoJSONGeometry} object TopoJSON object.
 * @param {Array.<Array.<ol.Coordinate>>} arcs Array of arcs.
 * @return {ol.geom.MultiPolygon} Geometry.
 * @private
 */
ol.format.TopoJSON.readMultiPolygonGeometry_ = function(object, arcs) {
  var coordinates = [];
  var polyArray, ringCoords, j, jj;
  var i, ii;
  for (i = 0, ii = object.arcs.length; i < ii; ++i) {
    // for each polygon
    polyArray = object.arcs[i];
    ringCoords = [];
    for (j = 0, jj = polyArray.length; j < jj; ++j) {
      // for each ring
      ringCoords[j] = ol.format.TopoJSON.concatenateArcs_(polyArray[j], arcs);
    }
    coordinates[i] = ringCoords;
  }
  return new ol.geom.MultiPolygon(coordinates);
};


/**
 * @inheritDoc
 */
ol.format.TopoJSON.prototype.getExtensions = function() {
  return ol.format.TopoJSON.EXTENSIONS_;
};


/**
 * Create features from a TopoJSON GeometryCollection object.
 *
 * @param {TopoJSONGeometryCollection} collection TopoJSON Geometry
 *     object.
 * @param {Array.<Array.<ol.Coordinate>>} arcs Array of arcs.
 * @param {Array.<number>} scale Scale for each dimension.
 * @param {Array.<number>} translate Translation for each dimension.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @return {Array.<ol.Feature>} Array of features.
 * @private
 */
ol.format.TopoJSON.readFeaturesFromGeometryCollection_ = function(
    collection, arcs, scale, translate, opt_options) {
  var geometries = collection.geometries;
  var features = [];
  var i, ii;
  for (i = 0, ii = geometries.length; i < ii; ++i) {
    features[i] = ol.format.TopoJSON.readFeatureFromGeometry_(
        geometries[i], arcs, scale, translate, opt_options);
  }
  return features;
};


/**
 * Create a feature from a TopoJSON geometry object.
 *
 * @param {TopoJSONGeometry} object TopoJSON geometry object.
 * @param {Array.<Array.<ol.Coordinate>>} arcs Array of arcs.
 * @param {Array.<number>} scale Scale for each dimension.
 * @param {Array.<number>} translate Translation for each dimension.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @return {ol.Feature} Feature.
 * @private
 */
ol.format.TopoJSON.readFeatureFromGeometry_ = function(object, arcs,
    scale, translate, opt_options) {
  var geometry;
  var type = object.type;
  var geometryReader = ol.format.TopoJSON.GEOMETRY_READERS_[type];
  if ((type === 'Point') || (type === 'MultiPoint')) {
    geometry = geometryReader(object, scale, translate);
  } else {
    geometry = geometryReader(object, arcs);
  }
  var feature = new ol.Feature();
  feature.setGeometry(/** @type {ol.geom.Geometry} */ (
      ol.format.Feature.transformWithOptions(geometry, false, opt_options)));
  if (object.id !== undefined) {
    feature.setId(object.id);
  }
  if (object.properties) {
    feature.setProperties(object.properties);
  }
  return feature;
};


/**
 * Read all features from a TopoJSON source.
 *
 * @function
 * @param {Document|Node|Object|string} source Source.
 * @return {Array.<ol.Feature>} Features.
 * @api stable
 */
ol.format.TopoJSON.prototype.readFeatures;


/**
 * @inheritDoc
 */
ol.format.TopoJSON.prototype.readFeaturesFromObject = function(
    object, opt_options) {
  if (object.type == 'Topology') {
    var topoJSONTopology = /** @type {TopoJSONTopology} */ (object);
    var transform, scale = null, translate = null;
    if (topoJSONTopology.transform) {
      transform = topoJSONTopology.transform;
      scale = transform.scale;
      translate = transform.translate;
    }
    var arcs = topoJSONTopology.arcs;
    if (transform) {
      ol.format.TopoJSON.transformArcs_(arcs, scale, translate);
    }
    /** @type {Array.<ol.Feature>} */
    var features = [];
    var topoJSONFeatures = ol.obj.getValues(topoJSONTopology.objects);
    var i, ii;
    var feature;
    for (i = 0, ii = topoJSONFeatures.length; i < ii; ++i) {
      if (topoJSONFeatures[i].type === 'GeometryCollection') {
        feature = /** @type {TopoJSONGeometryCollection} */
            (topoJSONFeatures[i]);
        features.push.apply(features,
            ol.format.TopoJSON.readFeaturesFromGeometryCollection_(
                feature, arcs, scale, translate, opt_options));
      } else {
        feature = /** @type {TopoJSONGeometry} */
            (topoJSONFeatures[i]);
        features.push(ol.format.TopoJSON.readFeatureFromGeometry_(
            feature, arcs, scale, translate, opt_options));
      }
    }
    return features;
  } else {
    return [];
  }
};


/**
 * Apply a linear transform to array of arcs.  The provided array of arcs is
 * modified in place.
 *
 * @param {Array.<Array.<ol.Coordinate>>} arcs Array of arcs.
 * @param {Array.<number>} scale Scale for each dimension.
 * @param {Array.<number>} translate Translation for each dimension.
 * @private
 */
ol.format.TopoJSON.transformArcs_ = function(arcs, scale, translate) {
  var i, ii;
  for (i = 0, ii = arcs.length; i < ii; ++i) {
    ol.format.TopoJSON.transformArc_(arcs[i], scale, translate);
  }
};


/**
 * Apply a linear transform to an arc.  The provided arc is modified in place.
 *
 * @param {Array.<ol.Coordinate>} arc Arc.
 * @param {Array.<number>} scale Scale for each dimension.
 * @param {Array.<number>} translate Translation for each dimension.
 * @private
 */
ol.format.TopoJSON.transformArc_ = function(arc, scale, translate) {
  var x = 0;
  var y = 0;
  var vertex;
  var i, ii;
  for (i = 0, ii = arc.length; i < ii; ++i) {
    vertex = arc[i];
    x += vertex[0];
    y += vertex[1];
    vertex[0] = x;
    vertex[1] = y;
    ol.format.TopoJSON.transformVertex_(vertex, scale, translate);
  }
};


/**
 * Apply a linear transform to a vertex.  The provided vertex is modified in
 * place.
 *
 * @param {ol.Coordinate} vertex Vertex.
 * @param {Array.<number>} scale Scale for each dimension.
 * @param {Array.<number>} translate Translation for each dimension.
 * @private
 */
ol.format.TopoJSON.transformVertex_ = function(vertex, scale, translate) {
  vertex[0] = vertex[0] * scale[0] + translate[0];
  vertex[1] = vertex[1] * scale[1] + translate[1];
};


/**
 * Read the projection from a TopoJSON source.
 *
 * @function
 * @param {Document|Node|Object|string} object Source.
 * @return {ol.proj.Projection} Projection.
 * @api stable
 */
ol.format.TopoJSON.prototype.readProjection = function(object) {
  return this.defaultDataProjection;
};


/**
 * @const
 * @private
 * @type {Object.<string, function(TopoJSONGeometry, Array, ...Array): ol.geom.Geometry>}
 */
ol.format.TopoJSON.GEOMETRY_READERS_ = {
  'Point': ol.format.TopoJSON.readPointGeometry_,
  'LineString': ol.format.TopoJSON.readLineStringGeometry_,
  'Polygon': ol.format.TopoJSON.readPolygonGeometry_,
  'MultiPoint': ol.format.TopoJSON.readMultiPointGeometry_,
  'MultiLineString': ol.format.TopoJSON.readMultiLineStringGeometry_,
  'MultiPolygon': ol.format.TopoJSON.readMultiPolygonGeometry_
};

goog.provide('ol.format.WFS');

goog.require('ol');
goog.require('ol.asserts');
goog.require('ol.format.GML3');
goog.require('ol.format.GMLBase');
goog.require('ol.format.ogc.filter');
goog.require('ol.format.XMLFeature');
goog.require('ol.format.XSD');
goog.require('ol.geom.Geometry');
goog.require('ol.obj');
goog.require('ol.proj');
goog.require('ol.xml');


/**
 * @classdesc
 * Feature format for reading and writing data in the WFS format.
 * By default, supports WFS version 1.1.0. You can pass a GML format
 * as option if you want to read a WFS that contains GML2 (WFS 1.0.0).
 * Also see {@link ol.format.GMLBase} which is used by this format.
 *
 * @constructor
 * @param {olx.format.WFSOptions=} opt_options
 *     Optional configuration object.
 * @extends {ol.format.XMLFeature}
 * @api stable
 */
ol.format.WFS = function(opt_options) {
  var options = opt_options ? opt_options : {};

  /**
   * @private
   * @type {Array.<string>|string|undefined}
   */
  this.featureType_ = options.featureType;

  /**
   * @private
   * @type {Object.<string, string>|string|undefined}
   */
  this.featureNS_ = options.featureNS;

  /**
   * @private
   * @type {ol.format.GMLBase}
   */
  this.gmlFormat_ = options.gmlFormat ?
      options.gmlFormat : new ol.format.GML3();

  /**
   * @private
   * @type {string}
   */
  this.schemaLocation_ = options.schemaLocation ?
      options.schemaLocation : ol.format.WFS.SCHEMA_LOCATION;

  ol.format.XMLFeature.call(this);
};
ol.inherits(ol.format.WFS, ol.format.XMLFeature);


/**
 * @const
 * @type {string}
 */
ol.format.WFS.FEATURE_PREFIX = 'feature';


/**
 * @const
 * @type {string}
 */
ol.format.WFS.XMLNS = 'http://www.w3.org/2000/xmlns/';


/**
 * @const
 * @type {string}
 */
ol.format.WFS.SCHEMA_LOCATION = 'http://www.opengis.net/wfs ' +
    'http://schemas.opengis.net/wfs/1.1.0/wfs.xsd';


/**
 * Read all features from a WFS FeatureCollection.
 *
 * @function
 * @param {Document|Node|Object|string} source Source.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @return {Array.<ol.Feature>} Features.
 * @api stable
 */
ol.format.WFS.prototype.readFeatures;


/**
 * @inheritDoc
 */
ol.format.WFS.prototype.readFeaturesFromNode = function(node, opt_options) {
  var context = /** @type {ol.XmlNodeStackItem} */ ({
    'featureType': this.featureType_,
    'featureNS': this.featureNS_
  });
  ol.obj.assign(context, this.getReadOptions(node,
      opt_options ? opt_options : {}));
  var objectStack = [context];
  this.gmlFormat_.FEATURE_COLLECTION_PARSERS[ol.format.GMLBase.GMLNS][
      'featureMember'] =
      ol.xml.makeArrayPusher(ol.format.GMLBase.prototype.readFeaturesInternal);
  var features = ol.xml.pushParseAndPop([],
      this.gmlFormat_.FEATURE_COLLECTION_PARSERS, node,
      objectStack, this.gmlFormat_);
  if (!features) {
    features = [];
  }
  return features;
};


/**
 * Read transaction response of the source.
 *
 * @param {Document|Node|Object|string} source Source.
 * @return {ol.WFSTransactionResponse|undefined} Transaction response.
 * @api stable
 */
ol.format.WFS.prototype.readTransactionResponse = function(source) {
  if (ol.xml.isDocument(source)) {
    return this.readTransactionResponseFromDocument(
        /** @type {Document} */ (source));
  } else if (ol.xml.isNode(source)) {
    return this.readTransactionResponseFromNode(/** @type {Node} */ (source));
  } else if (typeof source === 'string') {
    var doc = ol.xml.parse(source);
    return this.readTransactionResponseFromDocument(doc);
  } else {
    return undefined;
  }
};


/**
 * Read feature collection metadata of the source.
 *
 * @param {Document|Node|Object|string} source Source.
 * @return {ol.WFSFeatureCollectionMetadata|undefined}
 *     FeatureCollection metadata.
 * @api stable
 */
ol.format.WFS.prototype.readFeatureCollectionMetadata = function(source) {
  if (ol.xml.isDocument(source)) {
    return this.readFeatureCollectionMetadataFromDocument(
        /** @type {Document} */ (source));
  } else if (ol.xml.isNode(source)) {
    return this.readFeatureCollectionMetadataFromNode(
        /** @type {Node} */ (source));
  } else if (typeof source === 'string') {
    var doc = ol.xml.parse(source);
    return this.readFeatureCollectionMetadataFromDocument(doc);
  } else {
    return undefined;
  }
};


/**
 * @param {Document} doc Document.
 * @return {ol.WFSFeatureCollectionMetadata|undefined}
 *     FeatureCollection metadata.
 */
ol.format.WFS.prototype.readFeatureCollectionMetadataFromDocument = function(doc) {
  goog.DEBUG && console.assert(doc.nodeType == Node.DOCUMENT_NODE,
      'doc.nodeType should be DOCUMENT');
  for (var n = doc.firstChild; n; n = n.nextSibling) {
    if (n.nodeType == Node.ELEMENT_NODE) {
      return this.readFeatureCollectionMetadataFromNode(n);
    }
  }
  return undefined;
};


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.WFS.FEATURE_COLLECTION_PARSERS_ = {
  'http://www.opengis.net/gml': {
    'boundedBy': ol.xml.makeObjectPropertySetter(
        ol.format.GMLBase.prototype.readGeometryElement, 'bounds')
  }
};


/**
 * @param {Node} node Node.
 * @return {ol.WFSFeatureCollectionMetadata|undefined}
 *     FeatureCollection metadata.
 */
ol.format.WFS.prototype.readFeatureCollectionMetadataFromNode = function(node) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'FeatureCollection',
      'localName should be FeatureCollection');
  var result = {};
  var value = ol.format.XSD.readNonNegativeIntegerString(
      node.getAttribute('numberOfFeatures'));
  result['numberOfFeatures'] = value;
  return ol.xml.pushParseAndPop(
      /** @type {ol.WFSFeatureCollectionMetadata} */ (result),
      ol.format.WFS.FEATURE_COLLECTION_PARSERS_, node, [], this.gmlFormat_);
};


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.WFS.TRANSACTION_SUMMARY_PARSERS_ = {
  'http://www.opengis.net/wfs': {
    'totalInserted': ol.xml.makeObjectPropertySetter(
        ol.format.XSD.readNonNegativeInteger),
    'totalUpdated': ol.xml.makeObjectPropertySetter(
        ol.format.XSD.readNonNegativeInteger),
    'totalDeleted': ol.xml.makeObjectPropertySetter(
        ol.format.XSD.readNonNegativeInteger)
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {Object|undefined} Transaction Summary.
 * @private
 */
ol.format.WFS.readTransactionSummary_ = function(node, objectStack) {
  return ol.xml.pushParseAndPop(
      {}, ol.format.WFS.TRANSACTION_SUMMARY_PARSERS_, node, objectStack);
};


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.WFS.OGC_FID_PARSERS_ = {
  'http://www.opengis.net/ogc': {
    'FeatureId': ol.xml.makeArrayPusher(function(node, objectStack) {
      return node.getAttribute('fid');
    })
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 */
ol.format.WFS.fidParser_ = function(node, objectStack) {
  ol.xml.parseNode(ol.format.WFS.OGC_FID_PARSERS_, node, objectStack);
};


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.WFS.INSERT_RESULTS_PARSERS_ = {
  'http://www.opengis.net/wfs': {
    'Feature': ol.format.WFS.fidParser_
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {Array.<string>|undefined} Insert results.
 * @private
 */
ol.format.WFS.readInsertResults_ = function(node, objectStack) {
  return ol.xml.pushParseAndPop(
      [], ol.format.WFS.INSERT_RESULTS_PARSERS_, node, objectStack);
};


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.WFS.TRANSACTION_RESPONSE_PARSERS_ = {
  'http://www.opengis.net/wfs': {
    'TransactionSummary': ol.xml.makeObjectPropertySetter(
        ol.format.WFS.readTransactionSummary_, 'transactionSummary'),
    'InsertResults': ol.xml.makeObjectPropertySetter(
        ol.format.WFS.readInsertResults_, 'insertIds')
  }
};


/**
 * @param {Document} doc Document.
 * @return {ol.WFSTransactionResponse|undefined} Transaction response.
 */
ol.format.WFS.prototype.readTransactionResponseFromDocument = function(doc) {
  goog.DEBUG && console.assert(doc.nodeType == Node.DOCUMENT_NODE,
      'doc.nodeType should be DOCUMENT');
  for (var n = doc.firstChild; n; n = n.nextSibling) {
    if (n.nodeType == Node.ELEMENT_NODE) {
      return this.readTransactionResponseFromNode(n);
    }
  }
  return undefined;
};


/**
 * @param {Node} node Node.
 * @return {ol.WFSTransactionResponse|undefined} Transaction response.
 */
ol.format.WFS.prototype.readTransactionResponseFromNode = function(node) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should  be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'TransactionResponse',
      'localName should be TransactionResponse');
  return ol.xml.pushParseAndPop(
      /** @type {ol.WFSTransactionResponse} */({}),
      ol.format.WFS.TRANSACTION_RESPONSE_PARSERS_, node, []);
};


/**
 * @type {Object.<string, Object.<string, ol.XmlSerializer>>}
 * @private
 */
ol.format.WFS.QUERY_SERIALIZERS_ = {
  'http://www.opengis.net/wfs': {
    'PropertyName': ol.xml.makeChildAppender(ol.format.XSD.writeStringTextNode)
  }
};


/**
 * @param {Node} node Node.
 * @param {ol.Feature} feature Feature.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.WFS.writeFeature_ = function(node, feature, objectStack) {
  var context = objectStack[objectStack.length - 1];
  var featureType = context['featureType'];
  var featureNS = context['featureNS'];
  var child = ol.xml.createElementNS(featureNS, featureType);
  node.appendChild(child);
  ol.format.GML3.prototype.writeFeatureElement(child, feature, objectStack);
};


/**
 * @param {Node} node Node.
 * @param {number|string} fid Feature identifier.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.WFS.writeOgcFidFilter_ = function(node, fid, objectStack) {
  var filter = ol.xml.createElementNS('http://www.opengis.net/ogc', 'Filter');
  var child = ol.xml.createElementNS('http://www.opengis.net/ogc', 'FeatureId');
  filter.appendChild(child);
  child.setAttribute('fid', fid);
  node.appendChild(filter);
};


/**
 * @param {Node} node Node.
 * @param {ol.Feature} feature Feature.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.WFS.writeDelete_ = function(node, feature, objectStack) {
  var context = objectStack[objectStack.length - 1];
  ol.asserts.assert(feature.getId() !== undefined, 26); // Features must have an id set
  var featureType = context['featureType'];
  var featurePrefix = context['featurePrefix'];
  featurePrefix = featurePrefix ? featurePrefix :
      ol.format.WFS.FEATURE_PREFIX;
  var featureNS = context['featureNS'];
  node.setAttribute('typeName', featurePrefix + ':' + featureType);
  ol.xml.setAttributeNS(node, ol.format.WFS.XMLNS, 'xmlns:' + featurePrefix,
      featureNS);
  var fid = feature.getId();
  if (fid !== undefined) {
    ol.format.WFS.writeOgcFidFilter_(node, fid, objectStack);
  }
};


/**
 * @param {Node} node Node.
 * @param {ol.Feature} feature Feature.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.WFS.writeUpdate_ = function(node, feature, objectStack) {
  var context = objectStack[objectStack.length - 1];
  ol.asserts.assert(feature.getId() !== undefined, 27); // Features must have an id set
  var featureType = context['featureType'];
  var featurePrefix = context['featurePrefix'];
  featurePrefix = featurePrefix ? featurePrefix :
      ol.format.WFS.FEATURE_PREFIX;
  var featureNS = context['featureNS'];
  node.setAttribute('typeName', featurePrefix + ':' + featureType);
  ol.xml.setAttributeNS(node, ol.format.WFS.XMLNS, 'xmlns:' + featurePrefix,
      featureNS);
  var fid = feature.getId();
  if (fid !== undefined) {
    var keys = feature.getKeys();
    var values = [];
    for (var i = 0, ii = keys.length; i < ii; i++) {
      var value = feature.get(keys[i]);
      if (value !== undefined) {
        values.push({name: keys[i], value: value});
      }
    }
    ol.xml.pushSerializeAndPop(/** @type {ol.XmlNodeStackItem} */ (
        {node: node, 'srsName': context['srsName']}),
        ol.format.WFS.TRANSACTION_SERIALIZERS_,
        ol.xml.makeSimpleNodeFactory('Property'), values,
        objectStack);
    ol.format.WFS.writeOgcFidFilter_(node, fid, objectStack);
  }
};


/**
 * @param {Node} node Node.
 * @param {Object} pair Property name and value.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.WFS.writeProperty_ = function(node, pair, objectStack) {
  var name = ol.xml.createElementNS('http://www.opengis.net/wfs', 'Name');
  node.appendChild(name);
  ol.format.XSD.writeStringTextNode(name, pair.name);
  if (pair.value !== undefined && pair.value !== null) {
    var value = ol.xml.createElementNS('http://www.opengis.net/wfs', 'Value');
    node.appendChild(value);
    if (pair.value instanceof ol.geom.Geometry) {
      ol.format.GML3.prototype.writeGeometryElement(value,
          pair.value, objectStack);
    } else {
      ol.format.XSD.writeStringTextNode(value, pair.value);
    }
  }
};


/**
 * @param {Node} node Node.
 * @param {{vendorId: string, safeToIgnore: boolean, value: string}}
 *     nativeElement The native element.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.WFS.writeNative_ = function(node, nativeElement, objectStack) {
  if (nativeElement.vendorId) {
    node.setAttribute('vendorId', nativeElement.vendorId);
  }
  if (nativeElement.safeToIgnore !== undefined) {
    node.setAttribute('safeToIgnore', nativeElement.safeToIgnore);
  }
  if (nativeElement.value !== undefined) {
    ol.format.XSD.writeStringTextNode(node, nativeElement.value);
  }
};


/**
 * @type {Object.<string, Object.<string, ol.XmlSerializer>>}
 * @private
 */
ol.format.WFS.TRANSACTION_SERIALIZERS_ = {
  'http://www.opengis.net/wfs': {
    'Insert': ol.xml.makeChildAppender(ol.format.WFS.writeFeature_),
    'Update': ol.xml.makeChildAppender(ol.format.WFS.writeUpdate_),
    'Delete': ol.xml.makeChildAppender(ol.format.WFS.writeDelete_),
    'Property': ol.xml.makeChildAppender(ol.format.WFS.writeProperty_),
    'Native': ol.xml.makeChildAppender(ol.format.WFS.writeNative_)
  }
};


/**
 * @param {Node} node Node.
 * @param {string} featureType Feature type.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.WFS.writeQuery_ = function(node, featureType, objectStack) {
  var context = /** @type {Object} */ (objectStack[objectStack.length - 1]);
  var featurePrefix = context['featurePrefix'];
  var featureNS = context['featureNS'];
  var propertyNames = context['propertyNames'];
  var srsName = context['srsName'];
  var prefix = featurePrefix ? featurePrefix + ':' : '';
  node.setAttribute('typeName', prefix + featureType);
  if (srsName) {
    node.setAttribute('srsName', srsName);
  }
  if (featureNS) {
    ol.xml.setAttributeNS(node, ol.format.WFS.XMLNS, 'xmlns:' + featurePrefix,
        featureNS);
  }
  var item = /** @type {ol.XmlNodeStackItem} */ (ol.obj.assign({}, context));
  item.node = node;
  ol.xml.pushSerializeAndPop(item,
      ol.format.WFS.QUERY_SERIALIZERS_,
      ol.xml.makeSimpleNodeFactory('PropertyName'), propertyNames,
      objectStack);
  var filter = context['filter'];
  if (filter) {
    var child = ol.xml.createElementNS('http://www.opengis.net/ogc', 'Filter');
    node.appendChild(child);
    ol.format.WFS.writeFilterCondition_(child, filter, objectStack);
  }
};


/**
 * @param {Node} node Node.
 * @param {ol.format.ogc.filter.Filter} filter Filter.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.WFS.writeFilterCondition_ = function(node, filter, objectStack) {
  /** @type {ol.XmlNodeStackItem} */
  var item = {node: node};
  ol.xml.pushSerializeAndPop(item,
      ol.format.WFS.GETFEATURE_SERIALIZERS_,
      ol.xml.makeSimpleNodeFactory(filter.getTagName()),
      [filter], objectStack);
};


/**
 * @param {Node} node Node.
 * @param {ol.format.ogc.filter.Bbox} filter Filter.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.WFS.writeBboxFilter_ = function(node, filter, objectStack) {
  var context = objectStack[objectStack.length - 1];
  context['srsName'] = filter.srsName;

  ol.format.WFS.writeOgcPropertyName_(node, filter.geometryName);
  ol.format.GML3.prototype.writeGeometryElement(node, filter.extent, objectStack);
};


/**
 * @param {Node} node Node.
 * @param {ol.format.ogc.filter.Intersects} filter Filter.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.WFS.writeIntersectsFilter_ = function(node, filter, objectStack) {
  var context = objectStack[objectStack.length - 1];
  context['srsName'] = filter.srsName;

  ol.format.WFS.writeOgcPropertyName_(node, filter.geometryName);
  ol.format.GML3.prototype.writeGeometryElement(node, filter.geometry, objectStack);
};


/**
 * @param {Node} node Node.
 * @param {ol.format.ogc.filter.Within} filter Filter.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.WFS.writeWithinFilter_ = function(node, filter, objectStack) {
  var context = objectStack[objectStack.length - 1];
  context['srsName'] = filter.srsName;

  ol.format.WFS.writeOgcPropertyName_(node, filter.geometryName);
  ol.format.GML3.prototype.writeGeometryElement(node, filter.geometry, objectStack);
};


/**
 * @param {Node} node Node.
 * @param {ol.format.ogc.filter.LogicalBinary} filter Filter.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.WFS.writeLogicalFilter_ = function(node, filter, objectStack) {
  /** @type {ol.XmlNodeStackItem} */
  var item = {node: node};
  var conditionA = filter.conditionA;
  ol.xml.pushSerializeAndPop(item,
      ol.format.WFS.GETFEATURE_SERIALIZERS_,
      ol.xml.makeSimpleNodeFactory(conditionA.getTagName()),
      [conditionA], objectStack);
  var conditionB = filter.conditionB;
  ol.xml.pushSerializeAndPop(item,
      ol.format.WFS.GETFEATURE_SERIALIZERS_,
      ol.xml.makeSimpleNodeFactory(conditionB.getTagName()),
      [conditionB], objectStack);
};


/**
 * @param {Node} node Node.
 * @param {ol.format.ogc.filter.Not} filter Filter.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.WFS.writeNotFilter_ = function(node, filter, objectStack) {
  /** @type {ol.XmlNodeStackItem} */
  var item = {node: node};
  var condition = filter.condition;
  ol.xml.pushSerializeAndPop(item,
      ol.format.WFS.GETFEATURE_SERIALIZERS_,
      ol.xml.makeSimpleNodeFactory(condition.getTagName()),
      [condition], objectStack);
};


/**
 * @param {Node} node Node.
 * @param {ol.format.ogc.filter.ComparisonBinary} filter Filter.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.WFS.writeComparisonFilter_ = function(node, filter, objectStack) {
  if (filter.matchCase !== undefined) {
    node.setAttribute('matchCase', filter.matchCase.toString());
  }
  ol.format.WFS.writeOgcPropertyName_(node, filter.propertyName);
  ol.format.WFS.writeOgcLiteral_(node, '' + filter.expression);
};


/**
 * @param {Node} node Node.
 * @param {ol.format.ogc.filter.IsNull} filter Filter.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.WFS.writeIsNullFilter_ = function(node, filter, objectStack) {
  ol.format.WFS.writeOgcPropertyName_(node, filter.propertyName);
};


/**
 * @param {Node} node Node.
 * @param {ol.format.ogc.filter.IsBetween} filter Filter.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.WFS.writeIsBetweenFilter_ = function(node, filter, objectStack) {
  ol.format.WFS.writeOgcPropertyName_(node, filter.propertyName);
  ol.format.WFS.writeOgcExpression_('LowerBoundary', node, '' + filter.lowerBoundary);
  ol.format.WFS.writeOgcExpression_('UpperBoundary', node, '' + filter.upperBoundary);
};


/**
 * @param {Node} node Node.
 * @param {ol.format.ogc.filter.IsLike} filter Filter.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.WFS.writeIsLikeFilter_ = function(node, filter, objectStack) {
  node.setAttribute('wildCard', filter.wildCard);
  node.setAttribute('singleChar', filter.singleChar);
  node.setAttribute('escapeChar', filter.escapeChar);
  if (filter.matchCase !== undefined) {
    node.setAttribute('matchCase', filter.matchCase.toString());
  }
  ol.format.WFS.writeOgcPropertyName_(node, filter.propertyName);
  ol.format.WFS.writeOgcLiteral_(node, '' + filter.pattern);
};


/**
 * @param {string} tagName Tag name.
 * @param {Node} node Node.
 * @param {string} value Value.
 * @private
 */
ol.format.WFS.writeOgcExpression_ = function(tagName, node, value) {
  var property = ol.xml.createElementNS('http://www.opengis.net/ogc', tagName);
  ol.format.XSD.writeStringTextNode(property, value);
  node.appendChild(property);
};


/**
 * @param {Node} node Node.
 * @param {string} value PropertyName value.
 * @private
 */
ol.format.WFS.writeOgcPropertyName_ = function(node, value) {
  ol.format.WFS.writeOgcExpression_('PropertyName', node, value);
};


/**
 * @param {Node} node Node.
 * @param {string} value PropertyName value.
 * @private
 */
ol.format.WFS.writeOgcLiteral_ = function(node, value) {
  ol.format.WFS.writeOgcExpression_('Literal', node, value);
};


/**
 * @type {Object.<string, Object.<string, ol.XmlSerializer>>}
 * @private
 */
ol.format.WFS.GETFEATURE_SERIALIZERS_ = {
  'http://www.opengis.net/wfs': {
    'Query': ol.xml.makeChildAppender(ol.format.WFS.writeQuery_)
  },
  'http://www.opengis.net/ogc': {
    'And': ol.xml.makeChildAppender(ol.format.WFS.writeLogicalFilter_),
    'Or': ol.xml.makeChildAppender(ol.format.WFS.writeLogicalFilter_),
    'Not': ol.xml.makeChildAppender(ol.format.WFS.writeNotFilter_),
    'BBOX': ol.xml.makeChildAppender(ol.format.WFS.writeBboxFilter_),
    'Intersects': ol.xml.makeChildAppender(ol.format.WFS.writeIntersectsFilter_),
    'Within': ol.xml.makeChildAppender(ol.format.WFS.writeWithinFilter_),
    'PropertyIsEqualTo': ol.xml.makeChildAppender(ol.format.WFS.writeComparisonFilter_),
    'PropertyIsNotEqualTo': ol.xml.makeChildAppender(ol.format.WFS.writeComparisonFilter_),
    'PropertyIsLessThan': ol.xml.makeChildAppender(ol.format.WFS.writeComparisonFilter_),
    'PropertyIsLessThanOrEqualTo': ol.xml.makeChildAppender(ol.format.WFS.writeComparisonFilter_),
    'PropertyIsGreaterThan': ol.xml.makeChildAppender(ol.format.WFS.writeComparisonFilter_),
    'PropertyIsGreaterThanOrEqualTo': ol.xml.makeChildAppender(ol.format.WFS.writeComparisonFilter_),
    'PropertyIsNull': ol.xml.makeChildAppender(ol.format.WFS.writeIsNullFilter_),
    'PropertyIsBetween': ol.xml.makeChildAppender(ol.format.WFS.writeIsBetweenFilter_),
    'PropertyIsLike': ol.xml.makeChildAppender(ol.format.WFS.writeIsLikeFilter_)
  }
};


/**
 * @param {Node} node Node.
 * @param {Array.<string>} featureTypes Feature types.
 * @param {Array.<*>} objectStack Node stack.
 * @private
 */
ol.format.WFS.writeGetFeature_ = function(node, featureTypes, objectStack) {
  var context = /** @type {Object} */ (objectStack[objectStack.length - 1]);
  var item = /** @type {ol.XmlNodeStackItem} */ (ol.obj.assign({}, context));
  item.node = node;
  ol.xml.pushSerializeAndPop(item,
      ol.format.WFS.GETFEATURE_SERIALIZERS_,
      ol.xml.makeSimpleNodeFactory('Query'), featureTypes,
      objectStack);
};


/**
 * Encode format as WFS `GetFeature` and return the Node.
 *
 * @param {olx.format.WFSWriteGetFeatureOptions} options Options.
 * @return {Node} Result.
 * @api stable
 */
ol.format.WFS.prototype.writeGetFeature = function(options) {
  var node = ol.xml.createElementNS('http://www.opengis.net/wfs',
      'GetFeature');
  node.setAttribute('service', 'WFS');
  node.setAttribute('version', '1.1.0');
  var filter;
  if (options) {
    if (options.handle) {
      node.setAttribute('handle', options.handle);
    }
    if (options.outputFormat) {
      node.setAttribute('outputFormat', options.outputFormat);
    }
    if (options.maxFeatures !== undefined) {
      node.setAttribute('maxFeatures', options.maxFeatures);
    }
    if (options.resultType) {
      node.setAttribute('resultType', options.resultType);
    }
    if (options.startIndex !== undefined) {
      node.setAttribute('startIndex', options.startIndex);
    }
    if (options.count !== undefined) {
      node.setAttribute('count', options.count);
    }
    filter = options.filter;
    if (options.bbox) {
      ol.asserts.assert(options.geometryName,
          12); // `options.geometryName` must also be provided when `options.bbox` is set
      var bbox = ol.format.ogc.filter.bbox(
          /** @type {string} */ (options.geometryName), options.bbox, options.srsName);
      if (filter) {
        // if bbox and filter are both set, combine the two into a single filter
        filter = ol.format.ogc.filter.and(filter, bbox);
      } else {
        filter = bbox;
      }
    }
  }
  ol.xml.setAttributeNS(node, 'http://www.w3.org/2001/XMLSchema-instance',
      'xsi:schemaLocation', this.schemaLocation_);
  /** @type {ol.XmlNodeStackItem} */
  var context = {
    node: node,
    'srsName': options.srsName,
    'featureNS': options.featureNS ? options.featureNS : this.featureNS_,
    'featurePrefix': options.featurePrefix,
    'geometryName': options.geometryName,
    'filter': filter,
    'propertyNames': options.propertyNames ? options.propertyNames : []
  };
  ol.asserts.assert(Array.isArray(options.featureTypes),
      11); // `options.featureTypes` should be an Array
  ol.format.WFS.writeGetFeature_(node, /** @type {!Array.<string>} */ (options.featureTypes), [context]);
  return node;
};


/**
 * Encode format as WFS `Transaction` and return the Node.
 *
 * @param {Array.<ol.Feature>} inserts The features to insert.
 * @param {Array.<ol.Feature>} updates The features to update.
 * @param {Array.<ol.Feature>} deletes The features to delete.
 * @param {olx.format.WFSWriteTransactionOptions} options Write options.
 * @return {Node} Result.
 * @api stable
 */
ol.format.WFS.prototype.writeTransaction = function(inserts, updates, deletes,
    options) {
  var objectStack = [];
  var node = ol.xml.createElementNS('http://www.opengis.net/wfs',
      'Transaction');
  node.setAttribute('service', 'WFS');
  node.setAttribute('version', '1.1.0');
  var baseObj;
  /** @type {ol.XmlNodeStackItem} */
  var obj;
  if (options) {
    baseObj = options.gmlOptions ? options.gmlOptions : {};
    if (options.handle) {
      node.setAttribute('handle', options.handle);
    }
  }
  ol.xml.setAttributeNS(node, 'http://www.w3.org/2001/XMLSchema-instance',
      'xsi:schemaLocation', this.schemaLocation_);
  if (inserts) {
    obj = {node: node, 'featureNS': options.featureNS,
      'featureType': options.featureType, 'featurePrefix': options.featurePrefix,
      'srsName': options.srsName};
    ol.obj.assign(obj, baseObj);
    ol.xml.pushSerializeAndPop(obj,
        ol.format.WFS.TRANSACTION_SERIALIZERS_,
        ol.xml.makeSimpleNodeFactory('Insert'), inserts,
        objectStack);
  }
  if (updates) {
    obj = {node: node, 'featureNS': options.featureNS,
      'featureType': options.featureType, 'featurePrefix': options.featurePrefix,
      'srsName': options.srsName};
    ol.obj.assign(obj, baseObj);
    ol.xml.pushSerializeAndPop(obj,
        ol.format.WFS.TRANSACTION_SERIALIZERS_,
        ol.xml.makeSimpleNodeFactory('Update'), updates,
        objectStack);
  }
  if (deletes) {
    ol.xml.pushSerializeAndPop({node: node, 'featureNS': options.featureNS,
      'featureType': options.featureType, 'featurePrefix': options.featurePrefix,
      'srsName': options.srsName},
    ol.format.WFS.TRANSACTION_SERIALIZERS_,
    ol.xml.makeSimpleNodeFactory('Delete'), deletes,
    objectStack);
  }
  if (options.nativeElements) {
    ol.xml.pushSerializeAndPop({node: node, 'featureNS': options.featureNS,
      'featureType': options.featureType, 'featurePrefix': options.featurePrefix,
      'srsName': options.srsName},
    ol.format.WFS.TRANSACTION_SERIALIZERS_,
    ol.xml.makeSimpleNodeFactory('Native'), options.nativeElements,
    objectStack);
  }
  return node;
};


/**
 * Read the projection from a WFS source.
 *
 * @function
 * @param {Document|Node|Object|string} source Source.
 * @return {?ol.proj.Projection} Projection.
 * @api stable
 */
ol.format.WFS.prototype.readProjection;


/**
 * @inheritDoc
 */
ol.format.WFS.prototype.readProjectionFromDocument = function(doc) {
  goog.DEBUG && console.assert(doc.nodeType == Node.DOCUMENT_NODE,
      'doc.nodeType should be a DOCUMENT');
  for (var n = doc.firstChild; n; n = n.nextSibling) {
    if (n.nodeType == Node.ELEMENT_NODE) {
      return this.readProjectionFromNode(n);
    }
  }
  return null;
};


/**
 * @inheritDoc
 */
ol.format.WFS.prototype.readProjectionFromNode = function(node) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'FeatureCollection',
      'localName should be FeatureCollection');

  if (node.firstElementChild &&
      node.firstElementChild.firstElementChild) {
    node = node.firstElementChild.firstElementChild;
    for (var n = node.firstElementChild; n; n = n.nextElementSibling) {
      if (!(n.childNodes.length === 0 ||
          (n.childNodes.length === 1 &&
          n.firstChild.nodeType === 3))) {
        var objectStack = [{}];
        this.gmlFormat_.readGeometryElement(n, objectStack);
        return ol.proj.get(objectStack.pop().srsName);
      }
    }
  }

  return null;
};

goog.provide('ol.format.WKT');

goog.require('ol');
goog.require('ol.Feature');
goog.require('ol.format.Feature');
goog.require('ol.format.TextFeature');
goog.require('ol.geom.GeometryCollection');
goog.require('ol.geom.GeometryType');
goog.require('ol.geom.LineString');
goog.require('ol.geom.MultiLineString');
goog.require('ol.geom.MultiPoint');
goog.require('ol.geom.MultiPolygon');
goog.require('ol.geom.Point');
goog.require('ol.geom.Polygon');


/**
 * @classdesc
 * Geometry format for reading and writing data in the `WellKnownText` (WKT)
 * format.
 *
 * @constructor
 * @extends {ol.format.TextFeature}
 * @param {olx.format.WKTOptions=} opt_options Options.
 * @api stable
 */
ol.format.WKT = function(opt_options) {

  var options = opt_options ? opt_options : {};

  ol.format.TextFeature.call(this);

  /**
   * Split GeometryCollection into multiple features.
   * @type {boolean}
   * @private
   */
  this.splitCollection_ = options.splitCollection !== undefined ?
      options.splitCollection : false;

};
ol.inherits(ol.format.WKT, ol.format.TextFeature);


/**
 * @const
 * @type {string}
 */
ol.format.WKT.EMPTY = 'EMPTY';


/**
 * @param {ol.geom.Point} geom Point geometry.
 * @return {string} Coordinates part of Point as WKT.
 * @private
 */
ol.format.WKT.encodePointGeometry_ = function(geom) {
  var coordinates = geom.getCoordinates();
  if (coordinates.length === 0) {
    return '';
  }
  return coordinates[0] + ' ' + coordinates[1];
};


/**
 * @param {ol.geom.MultiPoint} geom MultiPoint geometry.
 * @return {string} Coordinates part of MultiPoint as WKT.
 * @private
 */
ol.format.WKT.encodeMultiPointGeometry_ = function(geom) {
  var array = [];
  var components = geom.getPoints();
  for (var i = 0, ii = components.length; i < ii; ++i) {
    array.push('(' + ol.format.WKT.encodePointGeometry_(components[i]) + ')');
  }
  return array.join(',');
};


/**
 * @param {ol.geom.GeometryCollection} geom GeometryCollection geometry.
 * @return {string} Coordinates part of GeometryCollection as WKT.
 * @private
 */
ol.format.WKT.encodeGeometryCollectionGeometry_ = function(geom) {
  var array = [];
  var geoms = geom.getGeometries();
  for (var i = 0, ii = geoms.length; i < ii; ++i) {
    array.push(ol.format.WKT.encode_(geoms[i]));
  }
  return array.join(',');
};


/**
 * @param {ol.geom.LineString|ol.geom.LinearRing} geom LineString geometry.
 * @return {string} Coordinates part of LineString as WKT.
 * @private
 */
ol.format.WKT.encodeLineStringGeometry_ = function(geom) {
  var coordinates = geom.getCoordinates();
  var array = [];
  for (var i = 0, ii = coordinates.length; i < ii; ++i) {
    array.push(coordinates[i][0] + ' ' + coordinates[i][1]);
  }
  return array.join(',');
};


/**
 * @param {ol.geom.MultiLineString} geom MultiLineString geometry.
 * @return {string} Coordinates part of MultiLineString as WKT.
 * @private
 */
ol.format.WKT.encodeMultiLineStringGeometry_ = function(geom) {
  var array = [];
  var components = geom.getLineStrings();
  for (var i = 0, ii = components.length; i < ii; ++i) {
    array.push('(' + ol.format.WKT.encodeLineStringGeometry_(
        components[i]) + ')');
  }
  return array.join(',');
};


/**
 * @param {ol.geom.Polygon} geom Polygon geometry.
 * @return {string} Coordinates part of Polygon as WKT.
 * @private
 */
ol.format.WKT.encodePolygonGeometry_ = function(geom) {
  var array = [];
  var rings = geom.getLinearRings();
  for (var i = 0, ii = rings.length; i < ii; ++i) {
    array.push('(' + ol.format.WKT.encodeLineStringGeometry_(
        rings[i]) + ')');
  }
  return array.join(',');
};


/**
 * @param {ol.geom.MultiPolygon} geom MultiPolygon geometry.
 * @return {string} Coordinates part of MultiPolygon as WKT.
 * @private
 */
ol.format.WKT.encodeMultiPolygonGeometry_ = function(geom) {
  var array = [];
  var components = geom.getPolygons();
  for (var i = 0, ii = components.length; i < ii; ++i) {
    array.push('(' + ol.format.WKT.encodePolygonGeometry_(
        components[i]) + ')');
  }
  return array.join(',');
};


/**
 * Encode a geometry as WKT.
 * @param {ol.geom.Geometry} geom The geometry to encode.
 * @return {string} WKT string for the geometry.
 * @private
 */
ol.format.WKT.encode_ = function(geom) {
  var type = geom.getType();
  var geometryEncoder = ol.format.WKT.GeometryEncoder_[type];
  goog.DEBUG && console.assert(geometryEncoder, 'geometryEncoder should be defined');
  var enc = geometryEncoder(geom);
  type = type.toUpperCase();
  if (enc.length === 0) {
    return type + ' ' + ol.format.WKT.EMPTY;
  }
  return type + '(' + enc + ')';
};


/**
 * @const
 * @type {Object.<string, function(ol.geom.Geometry): string>}
 * @private
 */
ol.format.WKT.GeometryEncoder_ = {
  'Point': ol.format.WKT.encodePointGeometry_,
  'LineString': ol.format.WKT.encodeLineStringGeometry_,
  'Polygon': ol.format.WKT.encodePolygonGeometry_,
  'MultiPoint': ol.format.WKT.encodeMultiPointGeometry_,
  'MultiLineString': ol.format.WKT.encodeMultiLineStringGeometry_,
  'MultiPolygon': ol.format.WKT.encodeMultiPolygonGeometry_,
  'GeometryCollection': ol.format.WKT.encodeGeometryCollectionGeometry_
};


/**
 * Parse a WKT string.
 * @param {string} wkt WKT string.
 * @return {ol.geom.Geometry|ol.geom.GeometryCollection|undefined}
 *     The geometry created.
 * @private
 */
ol.format.WKT.prototype.parse_ = function(wkt) {
  var lexer = new ol.format.WKT.Lexer(wkt);
  var parser = new ol.format.WKT.Parser(lexer);
  return parser.parse();
};


/**
 * Read a feature from a WKT source.
 *
 * @function
 * @param {Document|Node|Object|string} source Source.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @return {ol.Feature} Feature.
 * @api stable
 */
ol.format.WKT.prototype.readFeature;


/**
 * @inheritDoc
 */
ol.format.WKT.prototype.readFeatureFromText = function(text, opt_options) {
  var geom = this.readGeometryFromText(text, opt_options);
  if (geom) {
    var feature = new ol.Feature();
    feature.setGeometry(geom);
    return feature;
  }
  return null;
};


/**
 * Read all features from a WKT source.
 *
 * @function
 * @param {Document|Node|Object|string} source Source.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @return {Array.<ol.Feature>} Features.
 * @api stable
 */
ol.format.WKT.prototype.readFeatures;


/**
 * @inheritDoc
 */
ol.format.WKT.prototype.readFeaturesFromText = function(text, opt_options) {
  var geometries = [];
  var geometry = this.readGeometryFromText(text, opt_options);
  if (this.splitCollection_ &&
      geometry.getType() == ol.geom.GeometryType.GEOMETRY_COLLECTION) {
    geometries = (/** @type {ol.geom.GeometryCollection} */ (geometry))
        .getGeometriesArray();
  } else {
    geometries = [geometry];
  }
  var feature, features = [];
  for (var i = 0, ii = geometries.length; i < ii; ++i) {
    feature = new ol.Feature();
    feature.setGeometry(geometries[i]);
    features.push(feature);
  }
  return features;
};


/**
 * Read a single geometry from a WKT source.
 *
 * @function
 * @param {Document|Node|Object|string} source Source.
 * @param {olx.format.ReadOptions=} opt_options Read options.
 * @return {ol.geom.Geometry} Geometry.
 * @api stable
 */
ol.format.WKT.prototype.readGeometry;


/**
 * @inheritDoc
 */
ol.format.WKT.prototype.readGeometryFromText = function(text, opt_options) {
  var geometry = this.parse_(text);
  if (geometry) {
    return /** @type {ol.geom.Geometry} */ (
        ol.format.Feature.transformWithOptions(geometry, false, opt_options));
  } else {
    return null;
  }
};


/**
 * Encode a feature as a WKT string.
 *
 * @function
 * @param {ol.Feature} feature Feature.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @return {string} WKT string.
 * @api stable
 */
ol.format.WKT.prototype.writeFeature;


/**
 * @inheritDoc
 */
ol.format.WKT.prototype.writeFeatureText = function(feature, opt_options) {
  var geometry = feature.getGeometry();
  if (geometry) {
    return this.writeGeometryText(geometry, opt_options);
  }
  return '';
};


/**
 * Encode an array of features as a WKT string.
 *
 * @function
 * @param {Array.<ol.Feature>} features Features.
 * @param {olx.format.WriteOptions=} opt_options Write options.
 * @return {string} WKT string.
 * @api stable
 */
ol.format.WKT.prototype.writeFeatures;


/**
 * @inheritDoc
 */
ol.format.WKT.prototype.writeFeaturesText = function(features, opt_options) {
  if (features.length == 1) {
    return this.writeFeatureText(features[0], opt_options);
  }
  var geometries = [];
  for (var i = 0, ii = features.length; i < ii; ++i) {
    geometries.push(features[i].getGeometry());
  }
  var collection = new ol.geom.GeometryCollection(geometries);
  return this.writeGeometryText(collection, opt_options);
};


/**
 * Write a single geometry as a WKT string.
 *
 * @function
 * @param {ol.geom.Geometry} geometry Geometry.
 * @return {string} WKT string.
 * @api stable
 */
ol.format.WKT.prototype.writeGeometry;


/**
 * @inheritDoc
 */
ol.format.WKT.prototype.writeGeometryText = function(geometry, opt_options) {
  return ol.format.WKT.encode_(/** @type {ol.geom.Geometry} */ (
      ol.format.Feature.transformWithOptions(geometry, true, opt_options)));
};


/**
 * @const
 * @enum {number}
 */
ol.format.WKT.TokenType = {
  TEXT: 1,
  LEFT_PAREN: 2,
  RIGHT_PAREN: 3,
  NUMBER: 4,
  COMMA: 5,
  EOF: 6
};


/**
 * Class to tokenize a WKT string.
 * @param {string} wkt WKT string.
 * @constructor
 * @protected
 */
ol.format.WKT.Lexer = function(wkt) {

  /**
   * @type {string}
   */
  this.wkt = wkt;

  /**
   * @type {number}
   * @private
   */
  this.index_ = -1;
};


/**
 * @param {string} c Character.
 * @return {boolean} Whether the character is alphabetic.
 * @private
 */
ol.format.WKT.Lexer.prototype.isAlpha_ = function(c) {
  return c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z';
};


/**
 * @param {string} c Character.
 * @param {boolean=} opt_decimal Whether the string number
 *     contains a dot, i.e. is a decimal number.
 * @return {boolean} Whether the character is numeric.
 * @private
 */
ol.format.WKT.Lexer.prototype.isNumeric_ = function(c, opt_decimal) {
  var decimal = opt_decimal !== undefined ? opt_decimal : false;
  return c >= '0' && c <= '9' || c == '.' && !decimal;
};


/**
 * @param {string} c Character.
 * @return {boolean} Whether the character is whitespace.
 * @private
 */
ol.format.WKT.Lexer.prototype.isWhiteSpace_ = function(c) {
  return c == ' ' || c == '\t' || c == '\r' || c == '\n';
};


/**
 * @return {string} Next string character.
 * @private
 */
ol.format.WKT.Lexer.prototype.nextChar_ = function() {
  return this.wkt.charAt(++this.index_);
};


/**
 * Fetch and return the next token.
 * @return {!ol.WKTToken} Next string token.
 */
ol.format.WKT.Lexer.prototype.nextToken = function() {
  var c = this.nextChar_();
  var token = {position: this.index_, value: c};

  if (c == '(') {
    token.type = ol.format.WKT.TokenType.LEFT_PAREN;
  } else if (c == ',') {
    token.type = ol.format.WKT.TokenType.COMMA;
  } else if (c == ')') {
    token.type = ol.format.WKT.TokenType.RIGHT_PAREN;
  } else if (this.isNumeric_(c) || c == '-') {
    token.type = ol.format.WKT.TokenType.NUMBER;
    token.value = this.readNumber_();
  } else if (this.isAlpha_(c)) {
    token.type = ol.format.WKT.TokenType.TEXT;
    token.value = this.readText_();
  } else if (this.isWhiteSpace_(c)) {
    return this.nextToken();
  } else if (c === '') {
    token.type = ol.format.WKT.TokenType.EOF;
  } else {
    throw new Error('Unexpected character: ' + c);
  }

  return token;
};


/**
 * @return {number} Numeric token value.
 * @private
 */
ol.format.WKT.Lexer.prototype.readNumber_ = function() {
  var c, index = this.index_;
  var decimal = false;
  var scientificNotation = false;
  do {
    if (c == '.') {
      decimal = true;
    } else if (c == 'e' || c == 'E') {
      scientificNotation = true;
    }
    c = this.nextChar_();
  } while (
      this.isNumeric_(c, decimal) ||
      // if we haven't detected a scientific number before, 'e' or 'E'
      // hint that we should continue to read
      !scientificNotation && (c == 'e' || c == 'E') ||
      // once we know that we have a scientific number, both '-' and '+'
      // are allowed
      scientificNotation && (c == '-' || c == '+')
  );
  return parseFloat(this.wkt.substring(index, this.index_--));
};


/**
 * @return {string} String token value.
 * @private
 */
ol.format.WKT.Lexer.prototype.readText_ = function() {
  var c, index = this.index_;
  do {
    c = this.nextChar_();
  } while (this.isAlpha_(c));
  return this.wkt.substring(index, this.index_--).toUpperCase();
};


/**
 * Class to parse the tokens from the WKT string.
 * @param {ol.format.WKT.Lexer} lexer The lexer.
 * @constructor
 * @protected
 */
ol.format.WKT.Parser = function(lexer) {

  /**
   * @type {ol.format.WKT.Lexer}
   * @private
   */
  this.lexer_ = lexer;

  /**
   * @type {ol.WKTToken}
   * @private
   */
  this.token_;

  /**
   * @type {number}
   * @private
   */
  this.dimension_ = 2;
};


/**
 * Fetch the next token form the lexer and replace the active token.
 * @private
 */
ol.format.WKT.Parser.prototype.consume_ = function() {
  this.token_ = this.lexer_.nextToken();
};


/**
 * If the given type matches the current token, consume it.
 * @param {ol.format.WKT.TokenType} type Token type.
 * @return {boolean} Whether the token matches the given type.
 */
ol.format.WKT.Parser.prototype.match = function(type) {
  var isMatch = this.token_.type == type;
  if (isMatch) {
    this.consume_();
  }
  return isMatch;
};


/**
 * Try to parse the tokens provided by the lexer.
 * @return {ol.geom.Geometry|ol.geom.GeometryCollection} The geometry.
 */
ol.format.WKT.Parser.prototype.parse = function() {
  this.consume_();
  var geometry = this.parseGeometry_();
  goog.DEBUG && console.assert(this.token_.type == ol.format.WKT.TokenType.EOF,
      'token type should be end of file');
  return geometry;
};


/**
 * @return {!(ol.geom.Geometry|ol.geom.GeometryCollection)} The geometry.
 * @private
 */
ol.format.WKT.Parser.prototype.parseGeometry_ = function() {
  var token = this.token_;
  if (this.match(ol.format.WKT.TokenType.TEXT)) {
    var geomType = token.value;
    if (geomType == ol.geom.GeometryType.GEOMETRY_COLLECTION.toUpperCase()) {
      var geometries = this.parseGeometryCollectionText_();
      return new ol.geom.GeometryCollection(geometries);
    } else {
      var parser = ol.format.WKT.Parser.GeometryParser_[geomType];
      var ctor = ol.format.WKT.Parser.GeometryConstructor_[geomType];
      if (!parser || !ctor) {
        throw new Error('Invalid geometry type: ' + geomType);
      }
      var coordinates = parser.call(this);
      return new ctor(coordinates);
    }
  }
  throw new Error(this.formatErrorMessage_());
};


/**
 * @return {!Array.<ol.geom.Geometry>} A collection of geometries.
 * @private
 */
ol.format.WKT.Parser.prototype.parseGeometryCollectionText_ = function() {
  if (this.match(ol.format.WKT.TokenType.LEFT_PAREN)) {
    var geometries = [];
    do {
      geometries.push(this.parseGeometry_());
    } while (this.match(ol.format.WKT.TokenType.COMMA));
    if (this.match(ol.format.WKT.TokenType.RIGHT_PAREN)) {
      return geometries;
    }
  } else if (this.isEmptyGeometry_()) {
    return [];
  }
  throw new Error(this.formatErrorMessage_());
};


/**
 * @return {Array.<number>} All values in a point.
 * @private
 */
ol.format.WKT.Parser.prototype.parsePointText_ = function() {
  if (this.match(ol.format.WKT.TokenType.LEFT_PAREN)) {
    var coordinates = this.parsePoint_();
    if (this.match(ol.format.WKT.TokenType.RIGHT_PAREN)) {
      return coordinates;
    }
  } else if (this.isEmptyGeometry_()) {
    return null;
  }
  throw new Error(this.formatErrorMessage_());
};


/**
 * @return {!Array.<!Array.<number>>} All points in a linestring.
 * @private
 */
ol.format.WKT.Parser.prototype.parseLineStringText_ = function() {
  if (this.match(ol.format.WKT.TokenType.LEFT_PAREN)) {
    var coordinates = this.parsePointList_();
    if (this.match(ol.format.WKT.TokenType.RIGHT_PAREN)) {
      return coordinates;
    }
  } else if (this.isEmptyGeometry_()) {
    return [];
  }
  throw new Error(this.formatErrorMessage_());
};


/**
 * @return {!Array.<!Array.<number>>} All points in a polygon.
 * @private
 */
ol.format.WKT.Parser.prototype.parsePolygonText_ = function() {
  if (this.match(ol.format.WKT.TokenType.LEFT_PAREN)) {
    var coordinates = this.parseLineStringTextList_();
    if (this.match(ol.format.WKT.TokenType.RIGHT_PAREN)) {
      return coordinates;
    }
  } else if (this.isEmptyGeometry_()) {
    return [];
  }
  throw new Error(this.formatErrorMessage_());
};


/**
 * @return {!Array.<!Array.<number>>} All points in a multipoint.
 * @private
 */
ol.format.WKT.Parser.prototype.parseMultiPointText_ = function() {
  if (this.match(ol.format.WKT.TokenType.LEFT_PAREN)) {
    var coordinates;
    if (this.token_.type == ol.format.WKT.TokenType.LEFT_PAREN) {
      coordinates = this.parsePointTextList_();
    } else {
      coordinates = this.parsePointList_();
    }
    if (this.match(ol.format.WKT.TokenType.RIGHT_PAREN)) {
      return coordinates;
    }
  } else if (this.isEmptyGeometry_()) {
    return [];
  }
  throw new Error(this.formatErrorMessage_());
};


/**
 * @return {!Array.<!Array.<number>>} All linestring points
 *                                        in a multilinestring.
 * @private
 */
ol.format.WKT.Parser.prototype.parseMultiLineStringText_ = function() {
  if (this.match(ol.format.WKT.TokenType.LEFT_PAREN)) {
    var coordinates = this.parseLineStringTextList_();
    if (this.match(ol.format.WKT.TokenType.RIGHT_PAREN)) {
      return coordinates;
    }
  } else if (this.isEmptyGeometry_()) {
    return [];
  }
  throw new Error(this.formatErrorMessage_());
};


/**
 * @return {!Array.<!Array.<number>>} All polygon points in a multipolygon.
 * @private
 */
ol.format.WKT.Parser.prototype.parseMultiPolygonText_ = function() {
  if (this.match(ol.format.WKT.TokenType.LEFT_PAREN)) {
    var coordinates = this.parsePolygonTextList_();
    if (this.match(ol.format.WKT.TokenType.RIGHT_PAREN)) {
      return coordinates;
    }
  } else if (this.isEmptyGeometry_()) {
    return [];
  }
  throw new Error(this.formatErrorMessage_());
};


/**
 * @return {!Array.<number>} A point.
 * @private
 */
ol.format.WKT.Parser.prototype.parsePoint_ = function() {
  var coordinates = [];
  for (var i = 0; i < this.dimension_; ++i) {
    var token = this.token_;
    if (this.match(ol.format.WKT.TokenType.NUMBER)) {
      coordinates.push(token.value);
    } else {
      break;
    }
  }
  if (coordinates.length == this.dimension_) {
    return coordinates;
  }
  throw new Error(this.formatErrorMessage_());
};


/**
 * @return {!Array.<!Array.<number>>} An array of points.
 * @private
 */
ol.format.WKT.Parser.prototype.parsePointList_ = function() {
  var coordinates = [this.parsePoint_()];
  while (this.match(ol.format.WKT.TokenType.COMMA)) {
    coordinates.push(this.parsePoint_());
  }
  return coordinates;
};


/**
 * @return {!Array.<!Array.<number>>} An array of points.
 * @private
 */
ol.format.WKT.Parser.prototype.parsePointTextList_ = function() {
  var coordinates = [this.parsePointText_()];
  while (this.match(ol.format.WKT.TokenType.COMMA)) {
    coordinates.push(this.parsePointText_());
  }
  return coordinates;
};


/**
 * @return {!Array.<!Array.<number>>} An array of points.
 * @private
 */
ol.format.WKT.Parser.prototype.parseLineStringTextList_ = function() {
  var coordinates = [this.parseLineStringText_()];
  while (this.match(ol.format.WKT.TokenType.COMMA)) {
    coordinates.push(this.parseLineStringText_());
  }
  return coordinates;
};


/**
 * @return {!Array.<!Array.<number>>} An array of points.
 * @private
 */
ol.format.WKT.Parser.prototype.parsePolygonTextList_ = function() {
  var coordinates = [this.parsePolygonText_()];
  while (this.match(ol.format.WKT.TokenType.COMMA)) {
    coordinates.push(this.parsePolygonText_());
  }
  return coordinates;
};


/**
 * @return {boolean} Whether the token implies an empty geometry.
 * @private
 */
ol.format.WKT.Parser.prototype.isEmptyGeometry_ = function() {
  var isEmpty = this.token_.type == ol.format.WKT.TokenType.TEXT &&
      this.token_.value == ol.format.WKT.EMPTY;
  if (isEmpty) {
    this.consume_();
  }
  return isEmpty;
};


/**
 * Create an error message for an unexpected token error.
 * @return {string} Error message.
 * @private
 */
ol.format.WKT.Parser.prototype.formatErrorMessage_ = function() {
  return 'Unexpected `' + this.token_.value + '` at position ' +
      this.token_.position + ' in `' + this.lexer_.wkt + '`';
};


/**
 * @enum {function (new:ol.geom.Geometry, Array, ol.geom.GeometryLayout)}
 * @private
 */
ol.format.WKT.Parser.GeometryConstructor_ = {
  'POINT': ol.geom.Point,
  'LINESTRING': ol.geom.LineString,
  'POLYGON': ol.geom.Polygon,
  'MULTIPOINT': ol.geom.MultiPoint,
  'MULTILINESTRING': ol.geom.MultiLineString,
  'MULTIPOLYGON': ol.geom.MultiPolygon
};


/**
 * @enum {(function(): Array)}
 * @private
 */
ol.format.WKT.Parser.GeometryParser_ = {
  'POINT': ol.format.WKT.Parser.prototype.parsePointText_,
  'LINESTRING': ol.format.WKT.Parser.prototype.parseLineStringText_,
  'POLYGON': ol.format.WKT.Parser.prototype.parsePolygonText_,
  'MULTIPOINT': ol.format.WKT.Parser.prototype.parseMultiPointText_,
  'MULTILINESTRING': ol.format.WKT.Parser.prototype.parseMultiLineStringText_,
  'MULTIPOLYGON': ol.format.WKT.Parser.prototype.parseMultiPolygonText_
};

goog.provide('ol.format.WMSCapabilities');

goog.require('ol');
goog.require('ol.format.XLink');
goog.require('ol.format.XML');
goog.require('ol.format.XSD');
goog.require('ol.xml');


/**
 * @classdesc
 * Format for reading WMS capabilities data
 *
 * @constructor
 * @extends {ol.format.XML}
 * @api
 */
ol.format.WMSCapabilities = function() {

  ol.format.XML.call(this);

  /**
   * @type {string|undefined}
   */
  this.version = undefined;
};
ol.inherits(ol.format.WMSCapabilities, ol.format.XML);


/**
 * Read a WMS capabilities document.
 *
 * @function
 * @param {Document|Node|string} source The XML source.
 * @return {Object} An object representing the WMS capabilities.
 * @api
 */
ol.format.WMSCapabilities.prototype.read;


/**
 * @param {Document} doc Document.
 * @return {Object} WMS Capability object.
 */
ol.format.WMSCapabilities.prototype.readFromDocument = function(doc) {
  goog.DEBUG && console.assert(doc.nodeType == Node.DOCUMENT_NODE,
      'doc.nodeType should be DOCUMENT');
  for (var n = doc.firstChild; n; n = n.nextSibling) {
    if (n.nodeType == Node.ELEMENT_NODE) {
      return this.readFromNode(n);
    }
  }
  return null;
};


/**
 * @param {Node} node Node.
 * @return {Object} WMS Capability object.
 */
ol.format.WMSCapabilities.prototype.readFromNode = function(node) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'WMS_Capabilities' ||
      node.localName == 'WMT_MS_Capabilities',
      'localName should be WMS_Capabilities or WMT_MS_Capabilities');
  this.version = node.getAttribute('version').trim();
  var wmsCapabilityObject = ol.xml.pushParseAndPop({
    'version': this.version
  }, ol.format.WMSCapabilities.PARSERS_, node, []);
  return wmsCapabilityObject ? wmsCapabilityObject : null;
};


/**
 * @private
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {Object|undefined} Attribution object.
 */
ol.format.WMSCapabilities.readAttribution_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Attribution',
      'localName should be Attribution');
  return ol.xml.pushParseAndPop(
      {}, ol.format.WMSCapabilities.ATTRIBUTION_PARSERS_, node, objectStack);
};


/**
 * @private
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {Object} Bounding box object.
 */
ol.format.WMSCapabilities.readBoundingBox_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'BoundingBox',
      'localName should be BoundingBox');

  var extent = [
    ol.format.XSD.readDecimalString(node.getAttribute('minx')),
    ol.format.XSD.readDecimalString(node.getAttribute('miny')),
    ol.format.XSD.readDecimalString(node.getAttribute('maxx')),
    ol.format.XSD.readDecimalString(node.getAttribute('maxy'))
  ];

  var resolutions = [
    ol.format.XSD.readDecimalString(node.getAttribute('resx')),
    ol.format.XSD.readDecimalString(node.getAttribute('resy'))
  ];

  return {
    'crs': node.getAttribute('CRS'),
    'extent': extent,
    'res': resolutions
  };
};


/**
 * @private
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {ol.Extent|undefined} Bounding box object.
 */
ol.format.WMSCapabilities.readEXGeographicBoundingBox_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'EX_GeographicBoundingBox',
      'localName should be EX_GeographicBoundingBox');
  var geographicBoundingBox = ol.xml.pushParseAndPop(
      {},
      ol.format.WMSCapabilities.EX_GEOGRAPHIC_BOUNDING_BOX_PARSERS_,
      node, objectStack);
  if (!geographicBoundingBox) {
    return undefined;
  }
  var westBoundLongitude = /** @type {number|undefined} */
      (geographicBoundingBox['westBoundLongitude']);
  var southBoundLatitude = /** @type {number|undefined} */
      (geographicBoundingBox['southBoundLatitude']);
  var eastBoundLongitude = /** @type {number|undefined} */
      (geographicBoundingBox['eastBoundLongitude']);
  var northBoundLatitude = /** @type {number|undefined} */
      (geographicBoundingBox['northBoundLatitude']);
  if (westBoundLongitude === undefined || southBoundLatitude === undefined ||
      eastBoundLongitude === undefined || northBoundLatitude === undefined) {
    return undefined;
  }
  return [
    westBoundLongitude, southBoundLatitude,
    eastBoundLongitude, northBoundLatitude
  ];
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Object|undefined} Capability object.
 */
ol.format.WMSCapabilities.readCapability_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Capability',
      'localName should be Capability');
  return ol.xml.pushParseAndPop(
      {}, ol.format.WMSCapabilities.CAPABILITY_PARSERS_, node, objectStack);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Object|undefined} Service object.
 */
ol.format.WMSCapabilities.readService_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Service',
      'localName should be Service');
  return ol.xml.pushParseAndPop(
      {}, ol.format.WMSCapabilities.SERVICE_PARSERS_, node, objectStack);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Object|undefined} Contact information object.
 */
ol.format.WMSCapabilities.readContactInformation_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType shpuld be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'ContactInformation',
      'localName should be ContactInformation');
  return ol.xml.pushParseAndPop(
      {}, ol.format.WMSCapabilities.CONTACT_INFORMATION_PARSERS_,
      node, objectStack);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Object|undefined} Contact person object.
 */
ol.format.WMSCapabilities.readContactPersonPrimary_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'ContactPersonPrimary',
      'localName should be ContactPersonPrimary');
  return ol.xml.pushParseAndPop(
      {}, ol.format.WMSCapabilities.CONTACT_PERSON_PARSERS_,
      node, objectStack);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Object|undefined} Contact address object.
 */
ol.format.WMSCapabilities.readContactAddress_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'ContactAddress',
      'localName should be ContactAddress');
  return ol.xml.pushParseAndPop(
      {}, ol.format.WMSCapabilities.CONTACT_ADDRESS_PARSERS_,
      node, objectStack);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Array.<string>|undefined} Format array.
 */
ol.format.WMSCapabilities.readException_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Exception',
      'localName should be Exception');
  return ol.xml.pushParseAndPop(
      [], ol.format.WMSCapabilities.EXCEPTION_PARSERS_, node, objectStack);
};


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @private
 * @return {Object|undefined} Layer object.
 */
ol.format.WMSCapabilities.readCapabilityLayer_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Layer', 'localName should be Layer');
  return ol.xml.pushParseAndPop(
      {}, ol.format.WMSCapabilities.LAYER_PARSERS_, node, objectStack);
};


/**
 * @private
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {Object|undefined} Layer object.
 */
ol.format.WMSCapabilities.readLayer_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Layer', 'localName should be Layer');
  var parentLayerObject = /**  @type {Object.<string,*>} */
      (objectStack[objectStack.length - 1]);

  var layerObject = ol.xml.pushParseAndPop(
      {}, ol.format.WMSCapabilities.LAYER_PARSERS_, node, objectStack);

  if (!layerObject) {
    return undefined;
  }
  var queryable =
      ol.format.XSD.readBooleanString(node.getAttribute('queryable'));
  if (queryable === undefined) {
    queryable = parentLayerObject['queryable'];
  }
  layerObject['queryable'] = queryable !== undefined ? queryable : false;

  var cascaded = ol.format.XSD.readNonNegativeIntegerString(
      node.getAttribute('cascaded'));
  if (cascaded === undefined) {
    cascaded = parentLayerObject['cascaded'];
  }
  layerObject['cascaded'] = cascaded;

  var opaque = ol.format.XSD.readBooleanString(node.getAttribute('opaque'));
  if (opaque === undefined) {
    opaque = parentLayerObject['opaque'];
  }
  layerObject['opaque'] = opaque !== undefined ? opaque : false;

  var noSubsets =
      ol.format.XSD.readBooleanString(node.getAttribute('noSubsets'));
  if (noSubsets === undefined) {
    noSubsets = parentLayerObject['noSubsets'];
  }
  layerObject['noSubsets'] = noSubsets !== undefined ? noSubsets : false;

  var fixedWidth =
      ol.format.XSD.readDecimalString(node.getAttribute('fixedWidth'));
  if (!fixedWidth) {
    fixedWidth = parentLayerObject['fixedWidth'];
  }
  layerObject['fixedWidth'] = fixedWidth;

  var fixedHeight =
      ol.format.XSD.readDecimalString(node.getAttribute('fixedHeight'));
  if (!fixedHeight) {
    fixedHeight = parentLayerObject['fixedHeight'];
  }
  layerObject['fixedHeight'] = fixedHeight;

  // See 7.2.4.8
  var addKeys = ['Style', 'CRS', 'AuthorityURL'];
  addKeys.forEach(function(key) {
    if (key in parentLayerObject) {
      var childValue = layerObject[key] || [];
      layerObject[key] = childValue.concat(parentLayerObject[key]);
    }
  });

  var replaceKeys = ['EX_GeographicBoundingBox', 'BoundingBox', 'Dimension',
    'Attribution', 'MinScaleDenominator', 'MaxScaleDenominator'];
  replaceKeys.forEach(function(key) {
    if (!(key in layerObject)) {
      var parentValue = parentLayerObject[key];
      layerObject[key] = parentValue;
    }
  });

  return layerObject;
};


/**
 * @private
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {Object} Dimension object.
 */
ol.format.WMSCapabilities.readDimension_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Dimension',
      'localName should be Dimension');
  var dimensionObject = {
    'name': node.getAttribute('name'),
    'units': node.getAttribute('units'),
    'unitSymbol': node.getAttribute('unitSymbol'),
    'default': node.getAttribute('default'),
    'multipleValues': ol.format.XSD.readBooleanString(
        node.getAttribute('multipleValues')),
    'nearestValue': ol.format.XSD.readBooleanString(
        node.getAttribute('nearestValue')),
    'current': ol.format.XSD.readBooleanString(node.getAttribute('current')),
    'values': ol.format.XSD.readString(node)
  };
  return dimensionObject;
};


/**
 * @private
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {Object|undefined} Online resource object.
 */
ol.format.WMSCapabilities.readFormatOnlineresource_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  return ol.xml.pushParseAndPop(
      {}, ol.format.WMSCapabilities.FORMAT_ONLINERESOURCE_PARSERS_,
      node, objectStack);
};


/**
 * @private
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {Object|undefined} Request object.
 */
ol.format.WMSCapabilities.readRequest_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Request',
      'localName should be Request');
  return ol.xml.pushParseAndPop(
      {}, ol.format.WMSCapabilities.REQUEST_PARSERS_, node, objectStack);
};


/**
 * @private
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {Object|undefined} DCP type object.
 */
ol.format.WMSCapabilities.readDCPType_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'DCPType',
      'localName should be DCPType');
  return ol.xml.pushParseAndPop(
      {}, ol.format.WMSCapabilities.DCPTYPE_PARSERS_, node, objectStack);
};


/**
 * @private
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {Object|undefined} HTTP object.
 */
ol.format.WMSCapabilities.readHTTP_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'HTTP', 'localName should be HTTP');
  return ol.xml.pushParseAndPop(
      {}, ol.format.WMSCapabilities.HTTP_PARSERS_, node, objectStack);
};


/**
 * @private
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {Object|undefined} Operation type object.
 */
ol.format.WMSCapabilities.readOperationType_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  return ol.xml.pushParseAndPop(
      {}, ol.format.WMSCapabilities.OPERATIONTYPE_PARSERS_, node, objectStack);
};


/**
 * @private
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {Object|undefined} Online resource object.
 */
ol.format.WMSCapabilities.readSizedFormatOnlineresource_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  var formatOnlineresource =
      ol.format.WMSCapabilities.readFormatOnlineresource_(node, objectStack);
  if (formatOnlineresource) {
    var size = [
      ol.format.XSD.readNonNegativeIntegerString(node.getAttribute('width')),
      ol.format.XSD.readNonNegativeIntegerString(node.getAttribute('height'))
    ];
    formatOnlineresource['size'] = size;
    return formatOnlineresource;
  }
  return undefined;
};


/**
 * @private
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {Object|undefined} Authority URL object.
 */
ol.format.WMSCapabilities.readAuthorityURL_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'AuthorityURL',
      'localName should be AuthorityURL');
  var authorityObject =
      ol.format.WMSCapabilities.readFormatOnlineresource_(node, objectStack);
  if (authorityObject) {
    authorityObject['name'] = node.getAttribute('name');
    return authorityObject;
  }
  return undefined;
};


/**
 * @private
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {Object|undefined} Metadata URL object.
 */
ol.format.WMSCapabilities.readMetadataURL_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'MetadataURL',
      'localName should be MetadataURL');
  var metadataObject =
      ol.format.WMSCapabilities.readFormatOnlineresource_(node, objectStack);
  if (metadataObject) {
    metadataObject['type'] = node.getAttribute('type');
    return metadataObject;
  }
  return undefined;
};


/**
 * @private
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {Object|undefined} Style object.
 */
ol.format.WMSCapabilities.readStyle_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Style', 'localName should be Style');
  return ol.xml.pushParseAndPop(
      {}, ol.format.WMSCapabilities.STYLE_PARSERS_, node, objectStack);
};


/**
 * @private
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {Array.<string>|undefined} Keyword list.
 */
ol.format.WMSCapabilities.readKeywordList_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'KeywordList',
      'localName should be KeywordList');
  return ol.xml.pushParseAndPop(
      [], ol.format.WMSCapabilities.KEYWORDLIST_PARSERS_, node, objectStack);
};


/**
 * @const
 * @private
 * @type {Array.<string>}
 */
ol.format.WMSCapabilities.NAMESPACE_URIS_ = [
  null,
  'http://www.opengis.net/wms'
];


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.WMSCapabilities.PARSERS_ = ol.xml.makeStructureNS(
    ol.format.WMSCapabilities.NAMESPACE_URIS_, {
      'Service': ol.xml.makeObjectPropertySetter(
          ol.format.WMSCapabilities.readService_),
      'Capability': ol.xml.makeObjectPropertySetter(
          ol.format.WMSCapabilities.readCapability_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.WMSCapabilities.CAPABILITY_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.WMSCapabilities.NAMESPACE_URIS_, {
      'Request': ol.xml.makeObjectPropertySetter(
          ol.format.WMSCapabilities.readRequest_),
      'Exception': ol.xml.makeObjectPropertySetter(
          ol.format.WMSCapabilities.readException_),
      'Layer': ol.xml.makeObjectPropertySetter(
          ol.format.WMSCapabilities.readCapabilityLayer_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.WMSCapabilities.SERVICE_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.WMSCapabilities.NAMESPACE_URIS_, {
      'Name': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'Title': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'Abstract': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'KeywordList': ol.xml.makeObjectPropertySetter(
          ol.format.WMSCapabilities.readKeywordList_),
      'OnlineResource': ol.xml.makeObjectPropertySetter(
          ol.format.XLink.readHref),
      'ContactInformation': ol.xml.makeObjectPropertySetter(
          ol.format.WMSCapabilities.readContactInformation_),
      'Fees': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'AccessConstraints': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readString),
      'LayerLimit': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readNonNegativeInteger),
      'MaxWidth': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readNonNegativeInteger),
      'MaxHeight': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readNonNegativeInteger)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.WMSCapabilities.CONTACT_INFORMATION_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.WMSCapabilities.NAMESPACE_URIS_, {
      'ContactPersonPrimary': ol.xml.makeObjectPropertySetter(
          ol.format.WMSCapabilities.readContactPersonPrimary_),
      'ContactPosition': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readString),
      'ContactAddress': ol.xml.makeObjectPropertySetter(
          ol.format.WMSCapabilities.readContactAddress_),
      'ContactVoiceTelephone': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readString),
      'ContactFacsimileTelephone': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readString),
      'ContactElectronicMailAddress': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readString)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.WMSCapabilities.CONTACT_PERSON_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.WMSCapabilities.NAMESPACE_URIS_, {
      'ContactPerson': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readString),
      'ContactOrganization': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readString)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.WMSCapabilities.CONTACT_ADDRESS_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.WMSCapabilities.NAMESPACE_URIS_, {
      'AddressType': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'Address': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'City': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'StateOrProvince': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readString),
      'PostCode': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'Country': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.WMSCapabilities.EXCEPTION_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.WMSCapabilities.NAMESPACE_URIS_, {
      'Format': ol.xml.makeArrayPusher(ol.format.XSD.readString)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.WMSCapabilities.LAYER_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.WMSCapabilities.NAMESPACE_URIS_, {
      'Name': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'Title': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'Abstract': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'KeywordList': ol.xml.makeObjectPropertySetter(
          ol.format.WMSCapabilities.readKeywordList_),
      'CRS': ol.xml.makeObjectPropertyPusher(ol.format.XSD.readString),
      'EX_GeographicBoundingBox': ol.xml.makeObjectPropertySetter(
          ol.format.WMSCapabilities.readEXGeographicBoundingBox_),
      'BoundingBox': ol.xml.makeObjectPropertyPusher(
          ol.format.WMSCapabilities.readBoundingBox_),
      'Dimension': ol.xml.makeObjectPropertyPusher(
          ol.format.WMSCapabilities.readDimension_),
      'Attribution': ol.xml.makeObjectPropertySetter(
          ol.format.WMSCapabilities.readAttribution_),
      'AuthorityURL': ol.xml.makeObjectPropertyPusher(
          ol.format.WMSCapabilities.readAuthorityURL_),
      'Identifier': ol.xml.makeObjectPropertyPusher(ol.format.XSD.readString),
      'MetadataURL': ol.xml.makeObjectPropertyPusher(
          ol.format.WMSCapabilities.readMetadataURL_),
      'DataURL': ol.xml.makeObjectPropertyPusher(
          ol.format.WMSCapabilities.readFormatOnlineresource_),
      'FeatureListURL': ol.xml.makeObjectPropertyPusher(
          ol.format.WMSCapabilities.readFormatOnlineresource_),
      'Style': ol.xml.makeObjectPropertyPusher(
          ol.format.WMSCapabilities.readStyle_),
      'MinScaleDenominator': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readDecimal),
      'MaxScaleDenominator': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readDecimal),
      'Layer': ol.xml.makeObjectPropertyPusher(
          ol.format.WMSCapabilities.readLayer_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.WMSCapabilities.ATTRIBUTION_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.WMSCapabilities.NAMESPACE_URIS_, {
      'Title': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'OnlineResource': ol.xml.makeObjectPropertySetter(
          ol.format.XLink.readHref),
      'LogoURL': ol.xml.makeObjectPropertySetter(
          ol.format.WMSCapabilities.readSizedFormatOnlineresource_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.WMSCapabilities.EX_GEOGRAPHIC_BOUNDING_BOX_PARSERS_ =
    ol.xml.makeStructureNS(ol.format.WMSCapabilities.NAMESPACE_URIS_, {
      'westBoundLongitude': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readDecimal),
      'eastBoundLongitude': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readDecimal),
      'southBoundLatitude': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readDecimal),
      'northBoundLatitude': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readDecimal)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.WMSCapabilities.REQUEST_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.WMSCapabilities.NAMESPACE_URIS_, {
      'GetCapabilities': ol.xml.makeObjectPropertySetter(
          ol.format.WMSCapabilities.readOperationType_),
      'GetMap': ol.xml.makeObjectPropertySetter(
          ol.format.WMSCapabilities.readOperationType_),
      'GetFeatureInfo': ol.xml.makeObjectPropertySetter(
          ol.format.WMSCapabilities.readOperationType_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.WMSCapabilities.OPERATIONTYPE_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.WMSCapabilities.NAMESPACE_URIS_, {
      'Format': ol.xml.makeObjectPropertyPusher(ol.format.XSD.readString),
      'DCPType': ol.xml.makeObjectPropertyPusher(
          ol.format.WMSCapabilities.readDCPType_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.WMSCapabilities.DCPTYPE_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.WMSCapabilities.NAMESPACE_URIS_, {
      'HTTP': ol.xml.makeObjectPropertySetter(
          ol.format.WMSCapabilities.readHTTP_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.WMSCapabilities.HTTP_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.WMSCapabilities.NAMESPACE_URIS_, {
      'Get': ol.xml.makeObjectPropertySetter(
          ol.format.WMSCapabilities.readFormatOnlineresource_),
      'Post': ol.xml.makeObjectPropertySetter(
          ol.format.WMSCapabilities.readFormatOnlineresource_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.WMSCapabilities.STYLE_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.WMSCapabilities.NAMESPACE_URIS_, {
      'Name': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'Title': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'Abstract': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'LegendURL': ol.xml.makeObjectPropertyPusher(
          ol.format.WMSCapabilities.readSizedFormatOnlineresource_),
      'StyleSheetURL': ol.xml.makeObjectPropertySetter(
          ol.format.WMSCapabilities.readFormatOnlineresource_),
      'StyleURL': ol.xml.makeObjectPropertySetter(
          ol.format.WMSCapabilities.readFormatOnlineresource_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.WMSCapabilities.FORMAT_ONLINERESOURCE_PARSERS_ =
    ol.xml.makeStructureNS(ol.format.WMSCapabilities.NAMESPACE_URIS_, {
      'Format': ol.xml.makeObjectPropertySetter(ol.format.XSD.readString),
      'OnlineResource': ol.xml.makeObjectPropertySetter(
          ol.format.XLink.readHref)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.WMSCapabilities.KEYWORDLIST_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.WMSCapabilities.NAMESPACE_URIS_, {
      'Keyword': ol.xml.makeArrayPusher(ol.format.XSD.readString)
    });

goog.provide('ol.format.WMSGetFeatureInfo');

goog.require('ol');
goog.require('ol.array');
goog.require('ol.format.GML2');
goog.require('ol.format.XMLFeature');
goog.require('ol.obj');
goog.require('ol.xml');


/**
 * @classdesc
 * Format for reading WMSGetFeatureInfo format. It uses
 * {@link ol.format.GML2} to read features.
 *
 * @constructor
 * @extends {ol.format.XMLFeature}
 * @param {olx.format.WMSGetFeatureInfoOptions=} opt_options Options.
 * @api
 */
ol.format.WMSGetFeatureInfo = function(opt_options) {

  var options = opt_options ? opt_options : {};

  /**
   * @private
   * @type {string}
   */
  this.featureNS_ = 'http://mapserver.gis.umn.edu/mapserver';


  /**
   * @private
   * @type {ol.format.GML2}
   */
  this.gmlFormat_ = new ol.format.GML2();


  /**
   * @private
   * @type {Array.<string>}
   */
  this.layers_ = options.layers ? options.layers : null;

  ol.format.XMLFeature.call(this);
};
ol.inherits(ol.format.WMSGetFeatureInfo, ol.format.XMLFeature);


/**
 * @const
 * @type {string}
 * @private
 */
ol.format.WMSGetFeatureInfo.featureIdentifier_ = '_feature';


/**
 * @const
 * @type {string}
 * @private
 */
ol.format.WMSGetFeatureInfo.layerIdentifier_ = '_layer';


/**
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {Array.<ol.Feature>} Features.
 * @private
 */
ol.format.WMSGetFeatureInfo.prototype.readFeatures_ = function(node, objectStack) {

  node.setAttribute('namespaceURI', this.featureNS_);
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  var localName = node.localName;
  /** @type {Array.<ol.Feature>} */
  var features = [];
  if (node.childNodes.length === 0) {
    return features;
  }
  if (localName == 'msGMLOutput') {
    for (var i = 0, ii = node.childNodes.length; i < ii; i++) {
      var layer = node.childNodes[i];
      if (layer.nodeType !== Node.ELEMENT_NODE) {
        continue;
      }
      var context = objectStack[0];

      goog.DEBUG && console.assert(layer.localName.indexOf(
          ol.format.WMSGetFeatureInfo.layerIdentifier_) >= 0,
          'localName of layer node should match layerIdentifier');

      var toRemove = ol.format.WMSGetFeatureInfo.layerIdentifier_;
      var layerName = layer.localName.replace(toRemove, '');

      if (this.layers_ && !ol.array.includes(this.layers_, layerName)) {
        continue;
      }

      var featureType = layerName +
          ol.format.WMSGetFeatureInfo.featureIdentifier_;

      context['featureType'] = featureType;
      context['featureNS'] = this.featureNS_;

      var parsers = {};
      parsers[featureType] = ol.xml.makeArrayPusher(
          this.gmlFormat_.readFeatureElement, this.gmlFormat_);
      var parsersNS = ol.xml.makeStructureNS(
          [context['featureNS'], null], parsers);
      layer.setAttribute('namespaceURI', this.featureNS_);
      var layerFeatures = ol.xml.pushParseAndPop(
          [], parsersNS, layer, objectStack, this.gmlFormat_);
      if (layerFeatures) {
        ol.array.extend(features, layerFeatures);
      }
    }
  }
  if (localName == 'FeatureCollection') {
    var gmlFeatures = ol.xml.pushParseAndPop([],
        this.gmlFormat_.FEATURE_COLLECTION_PARSERS, node,
        [{}], this.gmlFormat_);
    if (gmlFeatures) {
      features = gmlFeatures;
    }
  }
  return features;
};


/**
 * Read all features from a WMSGetFeatureInfo response.
 *
 * @function
 * @param {Document|Node|Object|string} source Source.
 * @param {olx.format.ReadOptions=} opt_options Options.
 * @return {Array.<ol.Feature>} Features.
 * @api stable
 */
ol.format.WMSGetFeatureInfo.prototype.readFeatures;


/**
 * @inheritDoc
 */
ol.format.WMSGetFeatureInfo.prototype.readFeaturesFromNode = function(node, opt_options) {
  var options = {};
  if (opt_options) {
    ol.obj.assign(options, this.getReadOptions(node, opt_options));
  }
  return this.readFeatures_(node, [options]);
};

goog.provide('ol.format.WMTSCapabilities');

goog.require('ol');
goog.require('ol.extent');
goog.require('ol.format.OWS');
goog.require('ol.format.XLink');
goog.require('ol.format.XML');
goog.require('ol.format.XSD');
goog.require('ol.xml');


/**
 * @classdesc
 * Format for reading WMTS capabilities data.
 *
 * @constructor
 * @extends {ol.format.XML}
 * @api
 */
ol.format.WMTSCapabilities = function() {
  ol.format.XML.call(this);

  /**
   * @type {ol.format.OWS}
   * @private
   */
  this.owsParser_ = new ol.format.OWS();
};
ol.inherits(ol.format.WMTSCapabilities, ol.format.XML);


/**
 * Read a WMTS capabilities document.
 *
 * @function
 * @param {Document|Node|string} source The XML source.
 * @return {Object} An object representing the WMTS capabilities.
 * @api
 */
ol.format.WMTSCapabilities.prototype.read;


/**
 * @param {Document} doc Document.
 * @return {Object} WMTS Capability object.
 */
ol.format.WMTSCapabilities.prototype.readFromDocument = function(doc) {
  goog.DEBUG && console.assert(doc.nodeType == Node.DOCUMENT_NODE,
      'doc.nodeType should be DOCUMENT');
  for (var n = doc.firstChild; n; n = n.nextSibling) {
    if (n.nodeType == Node.ELEMENT_NODE) {
      return this.readFromNode(n);
    }
  }
  return null;
};


/**
 * @param {Node} node Node.
 * @return {Object} WMTS Capability object.
 */
ol.format.WMTSCapabilities.prototype.readFromNode = function(node) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Capabilities',
      'localName should be Capabilities');
  var version = node.getAttribute('version').trim();
  var WMTSCapabilityObject = this.owsParser_.readFromNode(node);
  if (!WMTSCapabilityObject) {
    return null;
  }
  WMTSCapabilityObject['version'] = version;
  WMTSCapabilityObject = ol.xml.pushParseAndPop(WMTSCapabilityObject,
      ol.format.WMTSCapabilities.PARSERS_, node, []);
  return WMTSCapabilityObject ? WMTSCapabilityObject : null;
};


/**
 * @private
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {Object|undefined} Attribution object.
 */
ol.format.WMTSCapabilities.readContents_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Contents',
      'localName should be Contents');

  return ol.xml.pushParseAndPop({},
      ol.format.WMTSCapabilities.CONTENTS_PARSERS_, node, objectStack);
};


/**
 * @private
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {Object|undefined} Layers object.
 */
ol.format.WMTSCapabilities.readLayer_ = function(node, objectStack) {
  goog.DEBUG && console.assert(node.nodeType == Node.ELEMENT_NODE,
      'node.nodeType should be ELEMENT');
  goog.DEBUG && console.assert(node.localName == 'Layer', 'localName should be Layer');
  return ol.xml.pushParseAndPop({},
      ol.format.WMTSCapabilities.LAYER_PARSERS_, node, objectStack);
};


/**
 * @private
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {Object|undefined} Tile Matrix Set object.
 */
ol.format.WMTSCapabilities.readTileMatrixSet_ = function(node, objectStack) {
  return ol.xml.pushParseAndPop({},
      ol.format.WMTSCapabilities.TMS_PARSERS_, node, objectStack);
};


/**
 * @private
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {Object|undefined} Style object.
 */
ol.format.WMTSCapabilities.readStyle_ = function(node, objectStack) {
  var style = ol.xml.pushParseAndPop({},
      ol.format.WMTSCapabilities.STYLE_PARSERS_, node, objectStack);
  if (!style) {
    return undefined;
  }
  var isDefault = node.getAttribute('isDefault') === 'true';
  style['isDefault'] = isDefault;
  return style;

};


/**
 * @private
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {Object|undefined} Tile Matrix Set Link object.
 */
ol.format.WMTSCapabilities.readTileMatrixSetLink_ = function(node,
    objectStack) {
  return ol.xml.pushParseAndPop({},
      ol.format.WMTSCapabilities.TMS_LINKS_PARSERS_, node, objectStack);
};


/**
 * @private
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {Object|undefined} Dimension object.
 */
ol.format.WMTSCapabilities.readDimensions_ = function(node, objectStack) {
  return ol.xml.pushParseAndPop({},
      ol.format.WMTSCapabilities.DIMENSION_PARSERS_, node, objectStack);
};


/**
 * @private
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {Object|undefined} Resource URL object.
 */
ol.format.WMTSCapabilities.readResourceUrl_ = function(node, objectStack) {
  var format = node.getAttribute('format');
  var template = node.getAttribute('template');
  var resourceType = node.getAttribute('resourceType');
  var resource = {};
  if (format) {
    resource['format'] = format;
  }
  if (template) {
    resource['template'] = template;
  }
  if (resourceType) {
    resource['resourceType'] = resourceType;
  }
  return resource;
};


/**
 * @private
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {Object|undefined} WGS84 BBox object.
 */
ol.format.WMTSCapabilities.readWgs84BoundingBox_ = function(node, objectStack) {
  var coordinates = ol.xml.pushParseAndPop([],
      ol.format.WMTSCapabilities.WGS84_BBOX_READERS_, node, objectStack);
  if (coordinates.length != 2) {
    return undefined;
  }
  return ol.extent.boundingExtent(coordinates);
};


/**
 * @private
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {Object|undefined} Legend object.
 */
ol.format.WMTSCapabilities.readLegendUrl_ = function(node, objectStack) {
  var legend = {};
  legend['format'] = node.getAttribute('format');
  legend['href'] = ol.format.XLink.readHref(node);
  return legend;
};


/**
 * @private
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {Object|undefined} Coordinates object.
 */
ol.format.WMTSCapabilities.readCoordinates_ = function(node, objectStack) {
  var coordinates = ol.format.XSD.readString(node).split(' ');
  if (!coordinates || coordinates.length != 2) {
    return undefined;
  }
  var x = +coordinates[0];
  var y = +coordinates[1];
  if (isNaN(x) || isNaN(y)) {
    return undefined;
  }
  return [x, y];
};


/**
 * @private
 * @param {Node} node Node.
 * @param {Array.<*>} objectStack Object stack.
 * @return {Object|undefined} TileMatrix object.
 */
ol.format.WMTSCapabilities.readTileMatrix_ = function(node, objectStack) {
  return ol.xml.pushParseAndPop({},
      ol.format.WMTSCapabilities.TM_PARSERS_, node, objectStack);
};


/**
 * @const
 * @private
 * @type {Array.<string>}
 */
ol.format.WMTSCapabilities.NAMESPACE_URIS_ = [
  null,
  'http://www.opengis.net/wmts/1.0'
];


/**
 * @const
 * @private
 * @type {Array.<string>}
 */
ol.format.WMTSCapabilities.OWS_NAMESPACE_URIS_ = [
  null,
  'http://www.opengis.net/ows/1.1'
];


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.WMTSCapabilities.PARSERS_ = ol.xml.makeStructureNS(
    ol.format.WMTSCapabilities.NAMESPACE_URIS_, {
      'Contents': ol.xml.makeObjectPropertySetter(
          ol.format.WMTSCapabilities.readContents_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.WMTSCapabilities.CONTENTS_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.WMTSCapabilities.NAMESPACE_URIS_, {
      'Layer': ol.xml.makeObjectPropertyPusher(
          ol.format.WMTSCapabilities.readLayer_),
      'TileMatrixSet': ol.xml.makeObjectPropertyPusher(
          ol.format.WMTSCapabilities.readTileMatrixSet_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.WMTSCapabilities.LAYER_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.WMTSCapabilities.NAMESPACE_URIS_, {
      'Style': ol.xml.makeObjectPropertyPusher(
          ol.format.WMTSCapabilities.readStyle_),
      'Format': ol.xml.makeObjectPropertyPusher(
          ol.format.XSD.readString),
      'TileMatrixSetLink': ol.xml.makeObjectPropertyPusher(
          ol.format.WMTSCapabilities.readTileMatrixSetLink_),
      'Dimension': ol.xml.makeObjectPropertyPusher(
          ol.format.WMTSCapabilities.readDimensions_),
      'ResourceURL': ol.xml.makeObjectPropertyPusher(
          ol.format.WMTSCapabilities.readResourceUrl_)
    }, ol.xml.makeStructureNS(ol.format.WMTSCapabilities.OWS_NAMESPACE_URIS_, {
      'Title': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readString),
      'Abstract': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readString),
      'WGS84BoundingBox': ol.xml.makeObjectPropertySetter(
          ol.format.WMTSCapabilities.readWgs84BoundingBox_),
      'Identifier': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readString)
    }));


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.WMTSCapabilities.STYLE_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.WMTSCapabilities.NAMESPACE_URIS_, {
      'LegendURL': ol.xml.makeObjectPropertyPusher(
          ol.format.WMTSCapabilities.readLegendUrl_)
    }, ol.xml.makeStructureNS(ol.format.WMTSCapabilities.OWS_NAMESPACE_URIS_, {
      'Title': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readString),
      'Identifier': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readString)
    }));


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.WMTSCapabilities.TMS_LINKS_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.WMTSCapabilities.NAMESPACE_URIS_, {
      'TileMatrixSet': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readString)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.WMTSCapabilities.DIMENSION_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.WMTSCapabilities.NAMESPACE_URIS_, {
      'Default': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readString),
      'Value': ol.xml.makeObjectPropertyPusher(
          ol.format.XSD.readString)
    }, ol.xml.makeStructureNS(ol.format.WMTSCapabilities.OWS_NAMESPACE_URIS_, {
      'Identifier': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readString)
    }));


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.WMTSCapabilities.WGS84_BBOX_READERS_ = ol.xml.makeStructureNS(
    ol.format.WMTSCapabilities.OWS_NAMESPACE_URIS_, {
      'LowerCorner': ol.xml.makeArrayPusher(
          ol.format.WMTSCapabilities.readCoordinates_),
      'UpperCorner': ol.xml.makeArrayPusher(
          ol.format.WMTSCapabilities.readCoordinates_)
    });


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.WMTSCapabilities.TMS_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.WMTSCapabilities.NAMESPACE_URIS_, {
      'WellKnownScaleSet': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readString),
      'TileMatrix': ol.xml.makeObjectPropertyPusher(
          ol.format.WMTSCapabilities.readTileMatrix_)
    }, ol.xml.makeStructureNS(ol.format.WMTSCapabilities.OWS_NAMESPACE_URIS_, {
      'SupportedCRS': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readString),
      'Identifier': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readString)
    }));


/**
 * @const
 * @type {Object.<string, Object.<string, ol.XmlParser>>}
 * @private
 */
ol.format.WMTSCapabilities.TM_PARSERS_ = ol.xml.makeStructureNS(
    ol.format.WMTSCapabilities.NAMESPACE_URIS_, {
      'TopLeftCorner': ol.xml.makeObjectPropertySetter(
          ol.format.WMTSCapabilities.readCoordinates_),
      'ScaleDenominator': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readDecimal),
      'TileWidth': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readNonNegativeInteger),
      'TileHeight': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readNonNegativeInteger),
      'MatrixWidth': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readNonNegativeInteger),
      'MatrixHeight': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readNonNegativeInteger)
    }, ol.xml.makeStructureNS(ol.format.WMTSCapabilities.OWS_NAMESPACE_URIS_, {
      'Identifier': ol.xml.makeObjectPropertySetter(
          ol.format.XSD.readString)
    }));

// FIXME handle geolocation not supported

goog.provide('ol.Geolocation');

goog.require('ol');
goog.require('ol.events');
goog.require('ol.events.EventType');
goog.require('ol.Object');
goog.require('ol.geom.Polygon');
goog.require('ol.has');
goog.require('ol.math');
goog.require('ol.proj');
goog.require('ol.sphere.WGS84');


/**
 * @enum {string}
 */
ol.GeolocationProperty = {
  ACCURACY: 'accuracy',
  ACCURACY_GEOMETRY: 'accuracyGeometry',
  ALTITUDE: 'altitude',
  ALTITUDE_ACCURACY: 'altitudeAccuracy',
  HEADING: 'heading',
  POSITION: 'position',
  PROJECTION: 'projection',
  SPEED: 'speed',
  TRACKING: 'tracking',
  TRACKING_OPTIONS: 'trackingOptions'
};


/**
 * @classdesc
 * Helper class for providing HTML5 Geolocation capabilities.
 * The [Geolocation API](http://www.w3.org/TR/geolocation-API/)
 * is used to locate a user's position.
 *
 * To get notified of position changes, register a listener for the generic
 * `change` event on your instance of `ol.Geolocation`.
 *
 * Example:
 *
 *     var geolocation = new ol.Geolocation({
 *       // take the projection to use from the map's view
 *       projection: view.getProjection()
 *     });
 *     // listen to changes in position
 *     geolocation.on('change', function(evt) {
 *       window.console.log(geolocation.getPosition());
 *     });
 *
 * @fires error
 * @constructor
 * @extends {ol.Object}
 * @param {olx.GeolocationOptions=} opt_options Options.
 * @api stable
 */
ol.Geolocation = function(opt_options) {

  ol.Object.call(this);

  var options = opt_options || {};

  /**
   * The unprojected (EPSG:4326) device position.
   * @private
   * @type {ol.Coordinate}
   */
  this.position_ = null;

  /**
   * @private
   * @type {ol.TransformFunction}
   */
  this.transform_ = ol.proj.identityTransform;

  /**
   * @private
   * @type {number|undefined}
   */
  this.watchId_ = undefined;

  ol.events.listen(
      this, ol.Object.getChangeEventType(ol.GeolocationProperty.PROJECTION),
      this.handleProjectionChanged_, this);
  ol.events.listen(
      this, ol.Object.getChangeEventType(ol.GeolocationProperty.TRACKING),
      this.handleTrackingChanged_, this);

  if (options.projection !== undefined) {
    this.setProjection(ol.proj.get(options.projection));
  }
  if (options.trackingOptions !== undefined) {
    this.setTrackingOptions(options.trackingOptions);
  }

  this.setTracking(options.tracking !== undefined ? options.tracking : false);

};
ol.inherits(ol.Geolocation, ol.Object);


/**
 * @inheritDoc
 */
ol.Geolocation.prototype.disposeInternal = function() {
  this.setTracking(false);
  ol.Object.prototype.disposeInternal.call(this);
};


/**
 * @private
 */
ol.Geolocation.prototype.handleProjectionChanged_ = function() {
  var projection = this.getProjection();
  if (projection) {
    this.transform_ = ol.proj.getTransformFromProjections(
        ol.proj.get('EPSG:4326'), projection);
    if (this.position_) {
      this.set(
          ol.GeolocationProperty.POSITION, this.transform_(this.position_));
    }
  }
};


/**
 * @private
 */
ol.Geolocation.prototype.handleTrackingChanged_ = function() {
  if (ol.has.GEOLOCATION) {
    var tracking = this.getTracking();
    if (tracking && this.watchId_ === undefined) {
      this.watchId_ = ol.global.navigator.geolocation.watchPosition(
          this.positionChange_.bind(this),
          this.positionError_.bind(this),
          this.getTrackingOptions());
    } else if (!tracking && this.watchId_ !== undefined) {
      ol.global.navigator.geolocation.clearWatch(this.watchId_);
      this.watchId_ = undefined;
    }
  }
};


/**
 * @private
 * @param {GeolocationPosition} position position event.
 */
ol.Geolocation.prototype.positionChange_ = function(position) {
  var coords = position.coords;
  this.set(ol.GeolocationProperty.ACCURACY, coords.accuracy);
  this.set(ol.GeolocationProperty.ALTITUDE,
      coords.altitude === null ? undefined : coords.altitude);
  this.set(ol.GeolocationProperty.ALTITUDE_ACCURACY,
      coords.altitudeAccuracy === null ?
      undefined : coords.altitudeAccuracy);
  this.set(ol.GeolocationProperty.HEADING, coords.heading === null ?
      undefined : ol.math.toRadians(coords.heading));
  if (!this.position_) {
    this.position_ = [coords.longitude, coords.latitude];
  } else {
    this.position_[0] = coords.longitude;
    this.position_[1] = coords.latitude;
  }
  var projectedPosition = this.transform_(this.position_);
  this.set(ol.GeolocationProperty.POSITION, projectedPosition);
  this.set(ol.GeolocationProperty.SPEED,
      coords.speed === null ? undefined : coords.speed);
  var geometry = ol.geom.Polygon.circular(
      ol.sphere.WGS84, this.position_, coords.accuracy);
  geometry.applyTransform(this.transform_);
  this.set(ol.GeolocationProperty.ACCURACY_GEOMETRY, geometry);
  this.changed();
};

/**
 * Triggered when the Geolocation returns an error.
 * @event error
 * @api
 */

/**
 * @private
 * @param {GeolocationPositionError} error error object.
 */
ol.Geolocation.prototype.positionError_ = function(error) {
  error.type = ol.events.EventType.ERROR;
  this.setTracking(false);
  this.dispatchEvent(/** @type {{type: string, target: undefined}} */ (error));
};


/**
 * Get the accuracy of the position in meters.
 * @return {number|undefined} The accuracy of the position measurement in
 *     meters.
 * @observable
 * @api stable
 */
ol.Geolocation.prototype.getAccuracy = function() {
  return /** @type {number|undefined} */ (
      this.get(ol.GeolocationProperty.ACCURACY));
};


/**
 * Get a geometry of the position accuracy.
 * @return {?ol.geom.Geometry} A geometry of the position accuracy.
 * @observable
 * @api stable
 */
ol.Geolocation.prototype.getAccuracyGeometry = function() {
  return /** @type {?ol.geom.Geometry} */ (
      this.get(ol.GeolocationProperty.ACCURACY_GEOMETRY) || null);
};


/**
 * Get the altitude associated with the position.
 * @return {number|undefined} The altitude of the position in meters above mean
 *     sea level.
 * @observable
 * @api stable
 */
ol.Geolocation.prototype.getAltitude = function() {
  return /** @type {number|undefined} */ (
      this.get(ol.GeolocationProperty.ALTITUDE));
};


/**
 * Get the altitude accuracy of the position.
 * @return {number|undefined} The accuracy of the altitude measurement in
 *     meters.
 * @observable
 * @api stable
 */
ol.Geolocation.prototype.getAltitudeAccuracy = function() {
  return /** @type {number|undefined} */ (
      this.get(ol.GeolocationProperty.ALTITUDE_ACCURACY));
};


/**
 * Get the heading as radians clockwise from North.
 * @return {number|undefined} The heading of the device in radians from north.
 * @observable
 * @api stable
 */
ol.Geolocation.prototype.getHeading = function() {
  return /** @type {number|undefined} */ (
      this.get(ol.GeolocationProperty.HEADING));
};


/**
 * Get the position of the device.
 * @return {ol.Coordinate|undefined} The current position of the device reported
 *     in the current projection.
 * @observable
 * @api stable
 */
ol.Geolocation.prototype.getPosition = function() {
  return /** @type {ol.Coordinate|undefined} */ (
      this.get(ol.GeolocationProperty.POSITION));
};


/**
 * Get the projection associated with the position.
 * @return {ol.proj.Projection|undefined} The projection the position is
 *     reported in.
 * @observable
 * @api stable
 */
ol.Geolocation.prototype.getProjection = function() {
  return /** @type {ol.proj.Projection|undefined} */ (
      this.get(ol.GeolocationProperty.PROJECTION));
};


/**
 * Get the speed in meters per second.
 * @return {number|undefined} The instantaneous speed of the device in meters
 *     per second.
 * @observable
 * @api stable
 */
ol.Geolocation.prototype.getSpeed = function() {
  return /** @type {number|undefined} */ (
      this.get(ol.GeolocationProperty.SPEED));
};


/**
 * Determine if the device location is being tracked.
 * @return {boolean} The device location is being tracked.
 * @observable
 * @api stable
 */
ol.Geolocation.prototype.getTracking = function() {
  return /** @type {boolean} */ (
      this.get(ol.GeolocationProperty.TRACKING));
};


/**
 * Get the tracking options.
 * @see http://www.w3.org/TR/geolocation-API/#position-options
 * @return {GeolocationPositionOptions|undefined} PositionOptions as defined by
 *     the [HTML5 Geolocation spec
 *     ](http://www.w3.org/TR/geolocation-API/#position_options_interface).
 * @observable
 * @api stable
 */
ol.Geolocation.prototype.getTrackingOptions = function() {
  return /** @type {GeolocationPositionOptions|undefined} */ (
      this.get(ol.GeolocationProperty.TRACKING_OPTIONS));
};


/**
 * Set the projection to use for transforming the coordinates.
 * @param {ol.proj.Projection} projection The projection the position is
 *     reported in.
 * @observable
 * @api stable
 */
ol.Geolocation.prototype.setProjection = function(projection) {
  this.set(ol.GeolocationProperty.PROJECTION, projection);
};


/**
 * Enable or disable tracking.
 * @param {boolean} tracking Enable tracking.
 * @observable
 * @api stable
 */
ol.Geolocation.prototype.setTracking = function(tracking) {
  this.set(ol.GeolocationProperty.TRACKING, tracking);
};


/**
 * Set the tracking options.
 * @see http://www.w3.org/TR/geolocation-API/#position-options
 * @param {GeolocationPositionOptions} options PositionOptions as defined by the
 *     [HTML5 Geolocation spec
 *     ](http://www.w3.org/TR/geolocation-API/#position_options_interface).
 * @observable
 * @api stable
 */
ol.Geolocation.prototype.setTrackingOptions = function(options) {
  this.set(ol.GeolocationProperty.TRACKING_OPTIONS, options);
};

goog.provide('ol.geom.Circle');

goog.require('ol');
goog.require('ol.extent');
goog.require('ol.geom.GeometryLayout');
goog.require('ol.geom.GeometryType');
goog.require('ol.geom.SimpleGeometry');
goog.require('ol.geom.flat.deflate');


/**
 * @classdesc
 * Circle geometry.
 *
 * @constructor
 * @extends {ol.geom.SimpleGeometry}
 * @param {ol.Coordinate} center Center.
 * @param {number=} opt_radius Radius.
 * @param {ol.geom.GeometryLayout=} opt_layout Layout.
 * @api
 */
ol.geom.Circle = function(center, opt_radius, opt_layout) {
  ol.geom.SimpleGeometry.call(this);
  var radius = opt_radius ? opt_radius : 0;
  this.setCenterAndRadius(center, radius, opt_layout);
};
ol.inherits(ol.geom.Circle, ol.geom.SimpleGeometry);


/**
 * Make a complete copy of the geometry.
 * @return {!ol.geom.Circle} Clone.
 * @api
 */
ol.geom.Circle.prototype.clone = function() {
  var circle = new ol.geom.Circle(null);
  circle.setFlatCoordinates(this.layout, this.flatCoordinates.slice());
  return circle;
};


/**
 * @inheritDoc
 */
ol.geom.Circle.prototype.closestPointXY = function(x, y, closestPoint, minSquaredDistance) {
  var flatCoordinates = this.flatCoordinates;
  var dx = x - flatCoordinates[0];
  var dy = y - flatCoordinates[1];
  var squaredDistance = dx * dx + dy * dy;
  if (squaredDistance < minSquaredDistance) {
    var i;
    if (squaredDistance === 0) {
      for (i = 0; i < this.stride; ++i) {
        closestPoint[i] = flatCoordinates[i];
      }
    } else {
      var delta = this.getRadius() / Math.sqrt(squaredDistance);
      closestPoint[0] = flatCoordinates[0] + delta * dx;
      closestPoint[1] = flatCoordinates[1] + delta * dy;
      for (i = 2; i < this.stride; ++i) {
        closestPoint[i] = flatCoordinates[i];
      }
    }
    closestPoint.length = this.stride;
    return squaredDistance;
  } else {
    return minSquaredDistance;
  }
};


/**
 * @inheritDoc
 */
ol.geom.Circle.prototype.containsXY = function(x, y) {
  var flatCoordinates = this.flatCoordinates;
  var dx = x - flatCoordinates[0];
  var dy = y - flatCoordinates[1];
  return dx * dx + dy * dy <= this.getRadiusSquared_();
};


/**
 * Return the center of the circle as {@link ol.Coordinate coordinate}.
 * @return {ol.Coordinate} Center.
 * @api
 */
ol.geom.Circle.prototype.getCenter = function() {
  return this.flatCoordinates.slice(0, this.stride);
};


/**
 * @inheritDoc
 */
ol.geom.Circle.prototype.computeExtent = function(extent) {
  var flatCoordinates = this.flatCoordinates;
  var radius = flatCoordinates[this.stride] - flatCoordinates[0];
  return ol.extent.createOrUpdate(
      flatCoordinates[0] - radius, flatCoordinates[1] - radius,
      flatCoordinates[0] + radius, flatCoordinates[1] + radius,
      extent);
};


/**
 * Return the radius of the circle.
 * @return {number} Radius.
 * @api
 */
ol.geom.Circle.prototype.getRadius = function() {
  return Math.sqrt(this.getRadiusSquared_());
};


/**
 * @private
 * @return {number} Radius squared.
 */
ol.geom.Circle.prototype.getRadiusSquared_ = function() {
  var dx = this.flatCoordinates[this.stride] - this.flatCoordinates[0];
  var dy = this.flatCoordinates[this.stride + 1] - this.flatCoordinates[1];
  return dx * dx + dy * dy;
};


/**
 * @inheritDoc
 * @api
 */
ol.geom.Circle.prototype.getType = function() {
  return ol.geom.GeometryType.CIRCLE;
};


/**
 * @inheritDoc
 * @api stable
 */
ol.geom.Circle.prototype.intersectsExtent = function(extent) {
  var circleExtent = this.getExtent();
  if (ol.extent.intersects(extent, circleExtent)) {
    var center = this.getCenter();

    if (extent[0] <= center[0] && extent[2] >= center[0]) {
      return true;
    }
    if (extent[1] <= center[1] && extent[3] >= center[1]) {
      return true;
    }

    return ol.extent.forEachCorner(extent, this.intersectsCoordinate, this);
  }
  return false;

};


/**
 * Set the center of the circle as {@link ol.Coordinate coordinate}.
 * @param {ol.Coordinate} center Center.
 * @api
 */
ol.geom.Circle.prototype.setCenter = function(center) {
  var stride = this.stride;
  goog.DEBUG && console.assert(center.length == stride,
      'center array length should match stride');
  var radius = this.flatCoordinates[stride] - this.flatCoordinates[0];
  var flatCoordinates = center.slice();
  flatCoordinates[stride] = flatCoordinates[0] + radius;
  var i;
  for (i = 1; i < stride; ++i) {
    flatCoordinates[stride + i] = center[i];
  }
  this.setFlatCoordinates(this.layout, flatCoordinates);
};


/**
 * Set the center (as {@link ol.Coordinate coordinate}) and the radius (as
 * number) of the circle.
 * @param {ol.Coordinate} center Center.
 * @param {number} radius Radius.
 * @param {ol.geom.GeometryLayout=} opt_layout Layout.
 * @api
 */
ol.geom.Circle.prototype.setCenterAndRadius = function(center, radius, opt_layout) {
  if (!center) {
    this.setFlatCoordinates(ol.geom.GeometryLayout.XY, null);
  } else {
    this.setLayout(opt_layout, center, 0);
    if (!this.flatCoordinates) {
      this.flatCoordinates = [];
    }
    /** @type {Array.<number>} */
    var flatCoordinates = this.flatCoordinates;
    var offset = ol.geom.flat.deflate.coordinate(
        flatCoordinates, 0, center, this.stride);
    flatCoordinates[offset++] = flatCoordinates[0] + radius;
    var i, ii;
    for (i = 1, ii = this.stride; i < ii; ++i) {
      flatCoordinates[offset++] = flatCoordinates[i];
    }
    flatCoordinates.length = offset;
    this.changed();
  }
};


/**
 * @param {ol.geom.GeometryLayout} layout Layout.
 * @param {Array.<number>} flatCoordinates Flat coordinates.
 */
ol.geom.Circle.prototype.setFlatCoordinates = function(layout, flatCoordinates) {
  this.setFlatCoordinatesInternal(layout, flatCoordinates);
  this.changed();
};


/**
 * Set the radius of the circle. The radius is in the units of the projection.
 * @param {number} radius Radius.
 * @api
 */
ol.geom.Circle.prototype.setRadius = function(radius) {
  this.flatCoordinates[this.stride] = this.flatCoordinates[0] + radius;
  this.changed();
};


/**
 * Transform each coordinate of the circle from one coordinate reference system
 * to another. The geometry is modified in place.
 * If you do not want the geometry modified in place, first clone() it and
 * then use this function on the clone.
 *
 * Internally a circle is currently represented by two points: the center of
 * the circle `[cx, cy]`, and the point to the right of the circle
 * `[cx + r, cy]`. This `transform` function just transforms these two points.
 * So the resulting geometry is also a circle, and that circle does not
 * correspond to the shape that would be obtained by transforming every point
 * of the original circle.
 *
 * @param {ol.ProjectionLike} source The current projection.  Can be a
 *     string identifier or a {@link ol.proj.Projection} object.
 * @param {ol.ProjectionLike} destination The desired projection.  Can be a
 *     string identifier or a {@link ol.proj.Projection} object.
 * @return {ol.geom.Circle} This geometry.  Note that original geometry is
 *     modified in place.
 * @function
 * @api stable
 */
ol.geom.Circle.prototype.transform;

goog.provide('ol.geom.flat.geodesic');

goog.require('ol.math');
goog.require('ol.proj');


/**
 * @private
 * @param {function(number): ol.Coordinate} interpolate Interpolate function.
 * @param {ol.TransformFunction} transform Transform from longitude/latitude to
 *     projected coordinates.
 * @param {number} squaredTolerance Squared tolerance.
 * @return {Array.<number>} Flat coordinates.
 */
ol.geom.flat.geodesic.line_ = function(interpolate, transform, squaredTolerance) {
  // FIXME reduce garbage generation
  // FIXME optimize stack operations

  /** @type {Array.<number>} */
  var flatCoordinates = [];

  var geoA = interpolate(0);
  var geoB = interpolate(1);

  var a = transform(geoA);
  var b = transform(geoB);

  /** @type {Array.<ol.Coordinate>} */
  var geoStack = [geoB, geoA];
  /** @type {Array.<ol.Coordinate>} */
  var stack = [b, a];
  /** @type {Array.<number>} */
  var fractionStack = [1, 0];

  /** @type {Object.<string, boolean>} */
  var fractions = {};

  var maxIterations = 1e5;
  var geoM, m, fracA, fracB, fracM, key;

  while (--maxIterations > 0 && fractionStack.length > 0) {
    // Pop the a coordinate off the stack
    fracA = fractionStack.pop();
    geoA = geoStack.pop();
    a = stack.pop();
    // Add the a coordinate if it has not been added yet
    key = fracA.toString();
    if (!(key in fractions)) {
      flatCoordinates.push(a[0], a[1]);
      fractions[key] = true;
    }
    // Pop the b coordinate off the stack
    fracB = fractionStack.pop();
    geoB = geoStack.pop();
    b = stack.pop();
    // Find the m point between the a and b coordinates
    fracM = (fracA + fracB) / 2;
    geoM = interpolate(fracM);
    m = transform(geoM);
    if (ol.math.squaredSegmentDistance(m[0], m[1], a[0], a[1],
        b[0], b[1]) < squaredTolerance) {
      // If the m point is sufficiently close to the straight line, then we
      // discard it.  Just use the b coordinate and move on to the next line
      // segment.
      flatCoordinates.push(b[0], b[1]);
      key = fracB.toString();
      goog.DEBUG && console.assert(!(key in fractions),
          'fractions object should contain key : ' + key);
      fractions[key] = true;
    } else {
      // Otherwise, we need to subdivide the current line segment.  Split it
      // into two and push the two line segments onto the stack.
      fractionStack.push(fracB, fracM, fracM, fracA);
      stack.push(b, m, m, a);
      geoStack.push(geoB, geoM, geoM, geoA);
    }
  }
  goog.DEBUG && console.assert(maxIterations > 0,
      'maxIterations should be more than 0');

  return flatCoordinates;
};


/**
* Generate a great-circle arcs between two lat/lon points.
* @param {number} lon1 Longitude 1 in degrees.
* @param {number} lat1 Latitude 1 in degrees.
* @param {number} lon2 Longitude 2 in degrees.
* @param {number} lat2 Latitude 2 in degrees.
 * @param {ol.proj.Projection} projection Projection.
* @param {number} squaredTolerance Squared tolerance.
* @return {Array.<number>} Flat coordinates.
*/
ol.geom.flat.geodesic.greatCircleArc = function(
    lon1, lat1, lon2, lat2, projection, squaredTolerance) {

  var geoProjection = ol.proj.get('EPSG:4326');

  var cosLat1 = Math.cos(ol.math.toRadians(lat1));
  var sinLat1 = Math.sin(ol.math.toRadians(lat1));
  var cosLat2 = Math.cos(ol.math.toRadians(lat2));
  var sinLat2 = Math.sin(ol.math.toRadians(lat2));
  var cosDeltaLon = Math.cos(ol.math.toRadians(lon2 - lon1));
  var sinDeltaLon = Math.sin(ol.math.toRadians(lon2 - lon1));
  var d = sinLat1 * sinLat2 + cosLat1 * cosLat2 * cosDeltaLon;

  return ol.geom.flat.geodesic.line_(
      /**
       * @param {number} frac Fraction.
       * @return {ol.Coordinate} Coordinate.
       */
      function(frac) {
        if (1 <= d) {
          return [lon2, lat2];
        }
        var D = frac * Math.acos(d);
        var cosD = Math.cos(D);
        var sinD = Math.sin(D);
        var y = sinDeltaLon * cosLat2;
        var x = cosLat1 * sinLat2 - sinLat1 * cosLat2 * cosDeltaLon;
        var theta = Math.atan2(y, x);
        var lat = Math.asin(sinLat1 * cosD + cosLat1 * sinD * Math.cos(theta));
        var lon = ol.math.toRadians(lon1) +
            Math.atan2(Math.sin(theta) * sinD * cosLat1,
                       cosD - sinLat1 * Math.sin(lat));
        return [ol.math.toDegrees(lon), ol.math.toDegrees(lat)];
      }, ol.proj.getTransform(geoProjection, projection), squaredTolerance);
};


/**
 * Generate a meridian (line at constant longitude).
 * @param {number} lon Longitude.
 * @param {number} lat1 Latitude 1.
 * @param {number} lat2 Latitude 2.
 * @param {ol.proj.Projection} projection Projection.
 * @param {number} squaredTolerance Squared tolerance.
 * @return {Array.<number>} Flat coordinates.
 */
ol.geom.flat.geodesic.meridian = function(lon, lat1, lat2, projection, squaredTolerance) {
  var epsg4326Projection = ol.proj.get('EPSG:4326');
  return ol.geom.flat.geodesic.line_(
      /**
       * @param {number} frac Fraction.
       * @return {ol.Coordinate} Coordinate.
       */
      function(frac) {
        return [lon, lat1 + ((lat2 - lat1) * frac)];
      },
      ol.proj.getTransform(epsg4326Projection, projection), squaredTolerance);
};


/**
 * Generate a parallel (line at constant latitude).
 * @param {number} lat Latitude.
 * @param {number} lon1 Longitude 1.
 * @param {number} lon2 Longitude 2.
 * @param {ol.proj.Projection} projection Projection.
 * @param {number} squaredTolerance Squared tolerance.
 * @return {Array.<number>} Flat coordinates.
 */
ol.geom.flat.geodesic.parallel = function(lat, lon1, lon2, projection, squaredTolerance) {
  var epsg4326Projection = ol.proj.get('EPSG:4326');
  return ol.geom.flat.geodesic.line_(
      /**
       * @param {number} frac Fraction.
       * @return {ol.Coordinate} Coordinate.
       */
      function(frac) {
        return [lon1 + ((lon2 - lon1) * frac), lat];
      },
      ol.proj.getTransform(epsg4326Projection, projection), squaredTolerance);
};

goog.provide('ol.Graticule');

goog.require('ol.extent');
goog.require('ol.geom.GeometryLayout');
goog.require('ol.geom.LineString');
goog.require('ol.geom.flat.geodesic');
goog.require('ol.math');
goog.require('ol.proj');
goog.require('ol.render.EventType');
goog.require('ol.style.Stroke');


/**
 * Render a grid for a coordinate system on a map.
 * @constructor
 * @param {olx.GraticuleOptions=} opt_options Options.
 * @api
 */
ol.Graticule = function(opt_options) {

  var options = opt_options || {};

  /**
   * @type {ol.Map}
   * @private
   */
  this.map_ = null;

  /**
   * @type {ol.proj.Projection}
   * @private
   */
  this.projection_ = null;

  /**
   * @type {number}
   * @private
   */
  this.maxLat_ = Infinity;

  /**
   * @type {number}
   * @private
   */
  this.maxLon_ = Infinity;

  /**
   * @type {number}
   * @private
   */
  this.minLat_ = -Infinity;

  /**
   * @type {number}
   * @private
   */
  this.minLon_ = -Infinity;

  /**
   * @type {number}
   * @private
   */
  this.maxLatP_ = Infinity;

  /**
   * @type {number}
   * @private
   */
  this.maxLonP_ = Infinity;

  /**
   * @type {number}
   * @private
   */
  this.minLatP_ = -Infinity;

  /**
   * @type {number}
   * @private
   */
  this.minLonP_ = -Infinity;

  /**
   * @type {number}
   * @private
   */
  this.targetSize_ = options.targetSize !== undefined ?
      options.targetSize : 100;

  /**
   * @type {number}
   * @private
   */
  this.maxLines_ = options.maxLines !== undefined ? options.maxLines : 100;
  goog.DEBUG && console.assert(this.maxLines_ > 0,
      'this.maxLines_ should be more than 0');

  /**
   * @type {Array.<ol.geom.LineString>}
   * @private
   */
  this.meridians_ = [];

  /**
   * @type {Array.<ol.geom.LineString>}
   * @private
   */
  this.parallels_ = [];

  /**
   * @type {ol.style.Stroke}
   * @private
   */
  this.strokeStyle_ = options.strokeStyle !== undefined ?
      options.strokeStyle : ol.Graticule.DEFAULT_STROKE_STYLE_;

  /**
   * @type {ol.TransformFunction|undefined}
   * @private
   */
  this.fromLonLatTransform_ = undefined;

  /**
   * @type {ol.TransformFunction|undefined}
   * @private
   */
  this.toLonLatTransform_ = undefined;

  /**
   * @type {ol.Coordinate}
   * @private
   */
  this.projectionCenterLonLat_ = null;

  this.setMap(options.map !== undefined ? options.map : null);
};


/**
 * @type {ol.style.Stroke}
 * @private
 * @const
 */
ol.Graticule.DEFAULT_STROKE_STYLE_ = new ol.style.Stroke({
  color: 'rgba(0,0,0,0.2)'
});


/**
 * TODO can be configurable
 * @type {Array.<number>}
 * @private
 */
ol.Graticule.intervals_ = [90, 45, 30, 20, 10, 5, 2, 1, 0.5, 0.2, 0.1, 0.05,
  0.01, 0.005, 0.002, 0.001];


/**
 * @param {number} lon Longitude.
 * @param {number} minLat Minimal latitude.
 * @param {number} maxLat Maximal latitude.
 * @param {number} squaredTolerance Squared tolerance.
 * @param {ol.Extent} extent Extent.
 * @param {number} index Index.
 * @return {number} Index.
 * @private
 */
ol.Graticule.prototype.addMeridian_ = function(lon, minLat, maxLat, squaredTolerance, extent, index) {
  var lineString = this.getMeridian_(lon, minLat, maxLat,
      squaredTolerance, index);
  if (ol.extent.intersects(lineString.getExtent(), extent)) {
    this.meridians_[index++] = lineString;
  }
  return index;
};


/**
 * @param {number} lat Latitude.
 * @param {number} minLon Minimal longitude.
 * @param {number} maxLon Maximal longitude.
 * @param {number} squaredTolerance Squared tolerance.
 * @param {ol.Extent} extent Extent.
 * @param {number} index Index.
 * @return {number} Index.
 * @private
 */
ol.Graticule.prototype.addParallel_ = function(lat, minLon, maxLon, squaredTolerance, extent, index) {
  var lineString = this.getParallel_(lat, minLon, maxLon, squaredTolerance,
      index);
  if (ol.extent.intersects(lineString.getExtent(), extent)) {
    this.parallels_[index++] = lineString;
  }
  return index;
};


/**
 * @param {ol.Extent} extent Extent.
 * @param {ol.Coordinate} center Center.
 * @param {number} resolution Resolution.
 * @param {number} squaredTolerance Squared tolerance.
 * @private
 */
ol.Graticule.prototype.createGraticule_ = function(extent, center, resolution, squaredTolerance) {

  var interval = this.getInterval_(resolution);
  if (interval == -1) {
    this.meridians_.length = this.parallels_.length = 0;
    return;
  }

  var centerLonLat = this.toLonLatTransform_(center);
  var centerLon = centerLonLat[0];
  var centerLat = centerLonLat[1];
  var maxLines = this.maxLines_;
  var cnt, idx, lat, lon;

  var validExtent = [
    Math.max(extent[0], this.minLonP_),
    Math.max(extent[1], this.minLatP_),
    Math.min(extent[2], this.maxLonP_),
    Math.min(extent[3], this.maxLatP_)
  ];

  validExtent = ol.proj.transformExtent(validExtent, this.projection_,
      'EPSG:4326');
  var maxLat = validExtent[3];
  var maxLon = validExtent[2];
  var minLat = validExtent[1];
  var minLon = validExtent[0];

  // Create meridians

  centerLon = Math.floor(centerLon / interval) * interval;
  lon = ol.math.clamp(centerLon, this.minLon_, this.maxLon_);

  idx = this.addMeridian_(lon, minLat, maxLat, squaredTolerance, extent, 0);

  cnt = 0;
  while (lon != this.minLon_ && cnt++ < maxLines) {
    lon = Math.max(lon - interval, this.minLon_);
    idx = this.addMeridian_(lon, minLat, maxLat, squaredTolerance, extent, idx);
  }

  lon = ol.math.clamp(centerLon, this.minLon_, this.maxLon_);

  cnt = 0;
  while (lon != this.maxLon_ && cnt++ < maxLines) {
    lon = Math.min(lon + interval, this.maxLon_);
    idx = this.addMeridian_(lon, minLat, maxLat, squaredTolerance, extent, idx);
  }

  this.meridians_.length = idx;

  // Create parallels

  centerLat = Math.floor(centerLat / interval) * interval;
  lat = ol.math.clamp(centerLat, this.minLat_, this.maxLat_);

  idx = this.addParallel_(lat, minLon, maxLon, squaredTolerance, extent, 0);

  cnt = 0;
  while (lat != this.minLat_ && cnt++ < maxLines) {
    lat = Math.max(lat - interval, this.minLat_);
    idx = this.addParallel_(lat, minLon, maxLon, squaredTolerance, extent, idx);
  }

  lat = ol.math.clamp(centerLat, this.minLat_, this.maxLat_);

  cnt = 0;
  while (lat != this.maxLat_ && cnt++ < maxLines) {
    lat = Math.min(lat + interval, this.maxLat_);
    idx = this.addParallel_(lat, minLon, maxLon, squaredTolerance, extent, idx);
  }

  this.parallels_.length = idx;

};


/**
 * @param {number} resolution Resolution.
 * @return {number} The interval in degrees.
 * @private
 */
ol.Graticule.prototype.getInterval_ = function(resolution) {
  var centerLon = this.projectionCenterLonLat_[0];
  var centerLat = this.projectionCenterLonLat_[1];
  var interval = -1;
  var i, ii, delta, dist;
  var target = Math.pow(this.targetSize_ * resolution, 2);
  /** @type {Array.<number>} **/
  var p1 = [];
  /** @type {Array.<number>} **/
  var p2 = [];
  for (i = 0, ii = ol.Graticule.intervals_.length; i < ii; ++i) {
    delta = ol.Graticule.intervals_[i] / 2;
    p1[0] = centerLon - delta;
    p1[1] = centerLat - delta;
    p2[0] = centerLon + delta;
    p2[1] = centerLat + delta;
    this.fromLonLatTransform_(p1, p1);
    this.fromLonLatTransform_(p2, p2);
    dist = Math.pow(p2[0] - p1[0], 2) + Math.pow(p2[1] - p1[1], 2);
    if (dist <= target) {
      break;
    }
    interval = ol.Graticule.intervals_[i];
  }
  return interval;
};


/**
 * Get the map associated with this graticule.
 * @return {ol.Map} The map.
 * @api
 */
ol.Graticule.prototype.getMap = function() {
  return this.map_;
};


/**
 * @param {number} lon Longitude.
 * @param {number} minLat Minimal latitude.
 * @param {number} maxLat Maximal latitude.
 * @param {number} squaredTolerance Squared tolerance.
 * @return {ol.geom.LineString} The meridian line string.
 * @param {number} index Index.
 * @private
 */
ol.Graticule.prototype.getMeridian_ = function(lon, minLat, maxLat,
                                               squaredTolerance, index) {
  goog.DEBUG && console.assert(lon >= this.minLon_,
      'lon should be larger than or equal to this.minLon_');
  goog.DEBUG && console.assert(lon <= this.maxLon_,
      'lon should be smaller than or equal to this.maxLon_');
  var flatCoordinates = ol.geom.flat.geodesic.meridian(lon,
      minLat, maxLat, this.projection_, squaredTolerance);
  goog.DEBUG && console.assert(flatCoordinates.length > 0,
      'flatCoordinates cannot be empty');
  var lineString = this.meridians_[index] !== undefined ?
      this.meridians_[index] : new ol.geom.LineString(null);
  lineString.setFlatCoordinates(ol.geom.GeometryLayout.XY, flatCoordinates);
  return lineString;
};


/**
 * Get the list of meridians.  Meridians are lines of equal longitude.
 * @return {Array.<ol.geom.LineString>} The meridians.
 * @api
 */
ol.Graticule.prototype.getMeridians = function() {
  return this.meridians_;
};


/**
 * @param {number} lat Latitude.
 * @param {number} minLon Minimal longitude.
 * @param {number} maxLon Maximal longitude.
 * @param {number} squaredTolerance Squared tolerance.
 * @return {ol.geom.LineString} The parallel line string.
 * @param {number} index Index.
 * @private
 */
ol.Graticule.prototype.getParallel_ = function(lat, minLon, maxLon,
                                               squaredTolerance, index) {
  goog.DEBUG && console.assert(lat >= this.minLat_,
      'lat should be larger than or equal to this.minLat_');
  goog.DEBUG && console.assert(lat <= this.maxLat_,
      'lat should be smaller than or equal to this.maxLat_');
  var flatCoordinates = ol.geom.flat.geodesic.parallel(lat,
      this.minLon_, this.maxLon_, this.projection_, squaredTolerance);
  goog.DEBUG && console.assert(flatCoordinates.length > 0,
      'flatCoordinates cannot be empty');
  var lineString = this.parallels_[index] !== undefined ?
      this.parallels_[index] : new ol.geom.LineString(null);
  lineString.setFlatCoordinates(ol.geom.GeometryLayout.XY, flatCoordinates);
  return lineString;
};


/**
 * Get the list of parallels.  Pallels are lines of equal latitude.
 * @return {Array.<ol.geom.LineString>} The parallels.
 * @api
 */
ol.Graticule.prototype.getParallels = function() {
  return this.parallels_;
};


/**
 * @param {ol.render.Event} e Event.
 * @private
 */
ol.Graticule.prototype.handlePostCompose_ = function(e) {
  var vectorContext = e.vectorContext;
  var frameState = e.frameState;
  var extent = frameState.extent;
  var viewState = frameState.viewState;
  var center = viewState.center;
  var projection = viewState.projection;
  var resolution = viewState.resolution;
  var pixelRatio = frameState.pixelRatio;
  var squaredTolerance =
      resolution * resolution / (4 * pixelRatio * pixelRatio);

  var updateProjectionInfo = !this.projection_ ||
      !ol.proj.equivalent(this.projection_, projection);

  if (updateProjectionInfo) {
    this.updateProjectionInfo_(projection);
  }

  //Fix the extent if wrapped.
  //(note: this is the same extent as vectorContext.extent_)
  var offsetX = 0;
  if (projection.canWrapX()) {
    var projectionExtent = projection.getExtent();
    var worldWidth = ol.extent.getWidth(projectionExtent);
    var x = frameState.focus[0];
    if (x < projectionExtent[0] || x > projectionExtent[2]) {
      var worldsAway = Math.ceil((projectionExtent[0] - x) / worldWidth);
      offsetX = worldWidth * worldsAway;
      extent = [
        extent[0] + offsetX, extent[1],
        extent[2] + offsetX, extent[3]
      ];
    }
  }

  this.createGraticule_(extent, center, resolution, squaredTolerance);

  // Draw the lines
  vectorContext.setFillStrokeStyle(null, this.strokeStyle_);
  var i, l, line;
  for (i = 0, l = this.meridians_.length; i < l; ++i) {
    line = this.meridians_[i];
    vectorContext.drawLineString(line, null);
  }
  for (i = 0, l = this.parallels_.length; i < l; ++i) {
    line = this.parallels_[i];
    vectorContext.drawLineString(line, null);
  }
};


/**
 * @param {ol.proj.Projection} projection Projection.
 * @private
 */
ol.Graticule.prototype.updateProjectionInfo_ = function(projection) {
  var epsg4326Projection = ol.proj.get('EPSG:4326');

  var extent = projection.getExtent();
  var worldExtent = projection.getWorldExtent();
  var worldExtentP = ol.proj.transformExtent(worldExtent,
      epsg4326Projection, projection);

  var maxLat = worldExtent[3];
  var maxLon = worldExtent[2];
  var minLat = worldExtent[1];
  var minLon = worldExtent[0];

  var maxLatP = worldExtentP[3];
  var maxLonP = worldExtentP[2];
  var minLatP = worldExtentP[1];
  var minLonP = worldExtentP[0];

  goog.DEBUG && console.assert(maxLat !== undefined, 'maxLat should be defined');
  goog.DEBUG && console.assert(maxLon !== undefined, 'maxLon should be defined');
  goog.DEBUG && console.assert(minLat !== undefined, 'minLat should be defined');
  goog.DEBUG && console.assert(minLon !== undefined, 'minLon should be defined');

  goog.DEBUG && console.assert(maxLatP !== undefined,
      'projected maxLat should be defined');
  goog.DEBUG && console.assert(maxLonP !== undefined,
      'projected maxLon should be defined');
  goog.DEBUG && console.assert(minLatP !== undefined,
      'projected minLat should be defined');
  goog.DEBUG && console.assert(minLonP !== undefined,
      'projected minLon should be defined');

  this.maxLat_ = maxLat;
  this.maxLon_ = maxLon;
  this.minLat_ = minLat;
  this.minLon_ = minLon;

  this.maxLatP_ = maxLatP;
  this.maxLonP_ = maxLonP;
  this.minLatP_ = minLatP;
  this.minLonP_ = minLonP;


  this.fromLonLatTransform_ = ol.proj.getTransform(
      epsg4326Projection, projection);

  this.toLonLatTransform_ = ol.proj.getTransform(
      projection, epsg4326Projection);

  this.projectionCenterLonLat_ = this.toLonLatTransform_(
      ol.extent.getCenter(extent));

  this.projection_ = projection;
};


/**
 * Set the map for this graticule.  The graticule will be rendered on the
 * provided map.
 * @param {ol.Map} map Map.
 * @api
 */
ol.Graticule.prototype.setMap = function(map) {
  if (this.map_) {
    this.map_.un(ol.render.EventType.POSTCOMPOSE,
        this.handlePostCompose_, this);
    this.map_.render();
  }
  if (map) {
    map.on(ol.render.EventType.POSTCOMPOSE,
        this.handlePostCompose_, this);
    map.render();
  }
  this.map_ = map;
};

goog.provide('ol.Image');

goog.require('ol');
goog.require('ol.ImageBase');
goog.require('ol.ImageState');
goog.require('ol.events');
goog.require('ol.events.EventType');
goog.require('ol.extent');
goog.require('ol.obj');


/**
 * @constructor
 * @extends {ol.ImageBase}
 * @param {ol.Extent} extent Extent.
 * @param {number|undefined} resolution Resolution.
 * @param {number} pixelRatio Pixel ratio.
 * @param {Array.<ol.Attribution>} attributions Attributions.
 * @param {string} src Image source URI.
 * @param {?string} crossOrigin Cross origin.
 * @param {ol.ImageLoadFunctionType} imageLoadFunction Image load function.
 */
ol.Image = function(extent, resolution, pixelRatio, attributions, src,
    crossOrigin, imageLoadFunction) {

  ol.ImageBase.call(this, extent, resolution, pixelRatio, ol.ImageState.IDLE,
      attributions);

  /**
   * @private
   * @type {string}
   */
  this.src_ = src;

  /**
   * @private
   * @type {HTMLCanvasElement|Image|HTMLVideoElement}
   */
  this.image_ = new Image();
  if (crossOrigin !== null) {
    this.image_.crossOrigin = crossOrigin;
  }

  /**
   * @private
   * @type {Object.<number, (HTMLCanvasElement|Image|HTMLVideoElement)>}
   */
  this.imageByContext_ = {};

  /**
   * @private
   * @type {Array.<ol.EventsKey>}
   */
  this.imageListenerKeys_ = null;

  /**
   * @protected
   * @type {ol.ImageState}
   */
  this.state = ol.ImageState.IDLE;

  /**
   * @private
   * @type {ol.ImageLoadFunctionType}
   */
  this.imageLoadFunction_ = imageLoadFunction;

};
ol.inherits(ol.Image, ol.ImageBase);


/**
 * Get the HTML image element (may be a Canvas, Image, or Video).
 * @param {Object=} opt_context Object.
 * @return {HTMLCanvasElement|Image|HTMLVideoElement} Image.
 * @api
 */
ol.Image.prototype.getImage = function(opt_context) {
  if (opt_context !== undefined) {
    var image;
    var key = ol.getUid(opt_context);
    if (key in this.imageByContext_) {
      return this.imageByContext_[key];
    } else if (ol.obj.isEmpty(this.imageByContext_)) {
      image = this.image_;
    } else {
      image = /** @type {Image} */ (this.image_.cloneNode(false));
    }
    this.imageByContext_[key] = image;
    return image;
  } else {
    return this.image_;
  }
};


/**
 * Tracks loading or read errors.
 *
 * @private
 */
ol.Image.prototype.handleImageError_ = function() {
  this.state = ol.ImageState.ERROR;
  this.unlistenImage_();
  this.changed();
};


/**
 * Tracks successful image load.
 *
 * @private
 */
ol.Image.prototype.handleImageLoad_ = function() {
  if (this.resolution === undefined) {
    this.resolution = ol.extent.getHeight(this.extent) / this.image_.height;
  }
  this.state = ol.ImageState.LOADED;
  this.unlistenImage_();
  this.changed();
};


/**
 * Load the image or retry if loading previously failed.
 * Loading is taken care of by the tile queue, and calling this method is
 * only needed for preloading or for reloading in case of an error.
 * @api
 */
ol.Image.prototype.load = function() {
  if (this.state == ol.ImageState.IDLE || this.state == ol.ImageState.ERROR) {
    this.state = ol.ImageState.LOADING;
    this.changed();
    goog.DEBUG && console.assert(!this.imageListenerKeys_,
        'this.imageListenerKeys_ should be null');
    this.imageListenerKeys_ = [
      ol.events.listenOnce(this.image_, ol.events.EventType.ERROR,
          this.handleImageError_, this),
      ol.events.listenOnce(this.image_, ol.events.EventType.LOAD,
          this.handleImageLoad_, this)
    ];
    this.imageLoadFunction_(this, this.src_);
  }
};


/**
 * @param {HTMLCanvasElement|Image|HTMLVideoElement} image Image.
 */
ol.Image.prototype.setImage = function(image) {
  this.image_ = image;
};


/**
 * Discards event handlers which listen for load completion or errors.
 *
 * @private
 */
ol.Image.prototype.unlistenImage_ = function() {
  this.imageListenerKeys_.forEach(ol.events.unlistenByKey);
  this.imageListenerKeys_ = null;
};

goog.provide('ol.ImageTile');

goog.require('ol');
goog.require('ol.Tile');
goog.require('ol.events');
goog.require('ol.events.EventType');
goog.require('ol.obj');


/**
 * @constructor
 * @extends {ol.Tile}
 * @param {ol.TileCoord} tileCoord Tile coordinate.
 * @param {ol.Tile.State} state State.
 * @param {string} src Image source URI.
 * @param {?string} crossOrigin Cross origin.
 * @param {ol.TileLoadFunctionType} tileLoadFunction Tile load function.
 */
ol.ImageTile = function(tileCoord, state, src, crossOrigin, tileLoadFunction) {

  ol.Tile.call(this, tileCoord, state);

  /**
   * Image URI
   *
   * @private
   * @type {string}
   */
  this.src_ = src;

  /**
   * @private
   * @type {Image}
   */
  this.image_ = new Image();
  if (crossOrigin !== null) {
    this.image_.crossOrigin = crossOrigin;
  }

  /**
   * @private
   * @type {Object.<number, Image>}
   */
  this.imageByContext_ = {};

  /**
   * @private
   * @type {Array.<ol.EventsKey>}
   */
  this.imageListenerKeys_ = null;

  /**
   * @private
   * @type {ol.TileLoadFunctionType}
   */
  this.tileLoadFunction_ = tileLoadFunction;

};
ol.inherits(ol.ImageTile, ol.Tile);


/**
 * @inheritDoc
 */
ol.ImageTile.prototype.disposeInternal = function() {
  if (this.state == ol.Tile.State.LOADING) {
    this.unlistenImage_();
  }
  if (this.interimTile) {
    this.interimTile.dispose();
  }
  this.state = ol.Tile.State.ABORT;
  this.changed();
  ol.Tile.prototype.disposeInternal.call(this);
};


/**
 * Get the image element for this tile.
 * @inheritDoc
 * @api
 */
ol.ImageTile.prototype.getImage = function(opt_context) {
  if (opt_context !== undefined) {
    var image;
    var key = ol.getUid(opt_context);
    if (key in this.imageByContext_) {
      return this.imageByContext_[key];
    } else if (ol.obj.isEmpty(this.imageByContext_)) {
      image = this.image_;
    } else {
      image = /** @type {Image} */ (this.image_.cloneNode(false));
    }
    this.imageByContext_[key] = image;
    return image;
  } else {
    return this.image_;
  }
};


/**
 * @inheritDoc
 */
ol.ImageTile.prototype.getKey = function() {
  return this.src_;
};


/**
 * Tracks loading or read errors.
 *
 * @private
 */
ol.ImageTile.prototype.handleImageError_ = function() {
  this.state = ol.Tile.State.ERROR;
  this.unlistenImage_();
  this.changed();
};


/**
 * Tracks successful image load.
 *
 * @private
 */
ol.ImageTile.prototype.handleImageLoad_ = function() {
  if (this.image_.naturalWidth && this.image_.naturalHeight) {
    this.state = ol.Tile.State.LOADED;
  } else {
    this.state = ol.Tile.State.EMPTY;
  }
  this.unlistenImage_();
  this.changed();
};


/**
 * Load the image or retry if loading previously failed.
 * Loading is taken care of by the tile queue, and calling this method is
 * only needed for preloading or for reloading in case of an error.
 * @api
 */
ol.ImageTile.prototype.load = function() {
  if (this.state == ol.Tile.State.IDLE || this.state == ol.Tile.State.ERROR) {
    this.state = ol.Tile.State.LOADING;
    this.changed();
    goog.DEBUG && console.assert(!this.imageListenerKeys_,
        'this.imageListenerKeys_ should be null');
    this.imageListenerKeys_ = [
      ol.events.listenOnce(this.image_, ol.events.EventType.ERROR,
          this.handleImageError_, this),
      ol.events.listenOnce(this.image_, ol.events.EventType.LOAD,
          this.handleImageLoad_, this)
    ];
    this.tileLoadFunction_(this, this.src_);
  }
};


/**
 * Discards event handlers which listen for load completion or errors.
 *
 * @private
 */
ol.ImageTile.prototype.unlistenImage_ = function() {
  this.imageListenerKeys_.forEach(ol.events.unlistenByKey);
  this.imageListenerKeys_ = null;
};

// FIXME should handle all geo-referenced data, not just vector data

goog.provide('ol.interaction.DragAndDrop');
goog.provide('ol.interaction.DragAndDropEvent');

goog.require('ol');
goog.require('ol.functions');
goog.require('ol.events');
goog.require('ol.events.Event');
goog.require('ol.events.EventType');
goog.require('ol.interaction.Interaction');
goog.require('ol.proj');


/**
 * @classdesc
 * Handles input of vector data by drag and drop.
 *
 * @constructor
 * @extends {ol.interaction.Interaction}
 * @fires ol.interaction.DragAndDropEvent
 * @param {olx.interaction.DragAndDropOptions=} opt_options Options.
 * @api stable
 */
ol.interaction.DragAndDrop = function(opt_options) {

  var options = opt_options ? opt_options : {};

  ol.interaction.Interaction.call(this, {
    handleEvent: ol.interaction.DragAndDrop.handleEvent
  });

  /**
   * @private
   * @type {Array.<function(new: ol.format.Feature)>}
   */
  this.formatConstructors_ = options.formatConstructors ?
      options.formatConstructors : [];

  /**
   * @private
   * @type {ol.proj.Projection}
   */
  this.projection_ = options.projection ?
      ol.proj.get(options.projection) : null;

  /**
   * @private
   * @type {Array.<ol.EventsKey>}
   */
  this.dropListenKeys_ = null;

  /**
   * @private
   * @type {Element}
   */
  this.target = options.target ? options.target : null;

};
ol.inherits(ol.interaction.DragAndDrop, ol.interaction.Interaction);


/**
 * @param {Event} event Event.
 * @this {ol.interaction.DragAndDrop}
 * @private
 */
ol.interaction.DragAndDrop.handleDrop_ = function(event) {
  var files = event.dataTransfer.files;
  var i, ii, file;
  for (i = 0, ii = files.length; i < ii; ++i) {
    file = files.item(i);
    var reader = new FileReader();
    reader.addEventListener(ol.events.EventType.LOAD,
        this.handleResult_.bind(this, file));
    reader.readAsText(file);
  }
};


/**
 * @param {Event} event Event.
 * @private
 */
ol.interaction.DragAndDrop.handleStop_ = function(event) {
  event.stopPropagation();
  event.preventDefault();
  event.dataTransfer.dropEffect = 'copy';
};


/**
 * @param {File} file File.
 * @param {Event} event Load event.
 * @private
 */
ol.interaction.DragAndDrop.prototype.handleResult_ = function(file, event) {
  var result = event.target.result;
  var map = this.getMap();
  var projection = this.projection_;
  if (!projection) {
    var view = map.getView();
    projection = view.getProjection();
    goog.DEBUG && console.assert(projection !== undefined,
        'projection should be defined');
  }
  var formatConstructors = this.formatConstructors_;
  var features = [];
  var i, ii;
  for (i = 0, ii = formatConstructors.length; i < ii; ++i) {
    var formatConstructor = formatConstructors[i];
    var format = new formatConstructor();
    features = this.tryReadFeatures_(format, result, {
      featureProjection: projection
    });
    if (features && features.length > 0) {
      break;
    }
  }
  this.dispatchEvent(
      new ol.interaction.DragAndDropEvent(
          ol.interaction.DragAndDropEventType.ADD_FEATURES, file,
          features, projection));
};


/**
 * Handles the {@link ol.MapBrowserEvent map browser event} unconditionally and
 * neither prevents the browser default nor stops event propagation.
 * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
 * @return {boolean} `false` to stop event propagation.
 * @this {ol.interaction.DragAndDrop}
 * @api
 */
ol.interaction.DragAndDrop.handleEvent = ol.functions.TRUE;


/**
 * @inheritDoc
 */
ol.interaction.DragAndDrop.prototype.setMap = function(map) {
  if (this.dropListenKeys_) {
    this.dropListenKeys_.forEach(ol.events.unlistenByKey);
    this.dropListenKeys_ = null;
  }
  ol.interaction.Interaction.prototype.setMap.call(this, map);
  if (map) {
    var dropArea = this.target ? this.target : map.getViewport();
    this.dropListenKeys_ = [
      ol.events.listen(dropArea, ol.events.EventType.DROP,
          ol.interaction.DragAndDrop.handleDrop_, this),
      ol.events.listen(dropArea, ol.events.EventType.DRAGENTER,
          ol.interaction.DragAndDrop.handleStop_, this),
      ol.events.listen(dropArea, ol.events.EventType.DRAGOVER,
          ol.interaction.DragAndDrop.handleStop_, this),
      ol.events.listen(dropArea, ol.events.EventType.DROP,
          ol.interaction.DragAndDrop.handleStop_, this)
    ];
  }
};


/**
 * @param {ol.format.Feature} format Format.
 * @param {string} text Text.
 * @param {olx.format.ReadOptions} options Read options.
 * @private
 * @return {Array.<ol.Feature>} Features.
 */
ol.interaction.DragAndDrop.prototype.tryReadFeatures_ = function(format, text, options) {
  try {
    return format.readFeatures(text, options);
  } catch (e) {
    return null;
  }
};


/**
 * @enum {string}
 */
ol.interaction.DragAndDropEventType = {
  /**
   * Triggered when features are added
   * @event ol.interaction.DragAndDropEvent#addfeatures
   * @api stable
   */
  ADD_FEATURES: 'addfeatures'
};


/**
 * @classdesc
 * Events emitted by {@link ol.interaction.DragAndDrop} instances are instances
 * of this type.
 *
 * @constructor
 * @extends {ol.events.Event}
 * @implements {oli.interaction.DragAndDropEvent}
 * @param {ol.interaction.DragAndDropEventType} type Type.
 * @param {File} file File.
 * @param {Array.<ol.Feature>=} opt_features Features.
 * @param {ol.proj.Projection=} opt_projection Projection.
 */
ol.interaction.DragAndDropEvent = function(type, file, opt_features, opt_projection) {

  ol.events.Event.call(this, type);

  /**
   * The features parsed from dropped data.
   * @type {Array.<ol.Feature>|undefined}
   * @api stable
   */
  this.features = opt_features;

  /**
   * The dropped file.
   * @type {File}
   * @api stable
   */
  this.file = file;

  /**
   * The feature projection.
   * @type {ol.proj.Projection|undefined}
   * @api
   */
  this.projection = opt_projection;

};
ol.inherits(ol.interaction.DragAndDropEvent, ol.events.Event);

goog.provide('ol.interaction.DragRotateAndZoom');

goog.require('ol');
goog.require('ol.View');
goog.require('ol.events.condition');
goog.require('ol.interaction.Interaction');
goog.require('ol.interaction.Pointer');


/**
 * @classdesc
 * Allows the user to zoom and rotate the map by clicking and dragging
 * on the map.  By default, this interaction is limited to when the shift
 * key is held down.
 *
 * This interaction is only supported for mouse devices.
 *
 * And this interaction is not included in the default interactions.
 *
 * @constructor
 * @extends {ol.interaction.Pointer}
 * @param {olx.interaction.DragRotateAndZoomOptions=} opt_options Options.
 * @api stable
 */
ol.interaction.DragRotateAndZoom = function(opt_options) {

  var options = opt_options ? opt_options : {};

  ol.interaction.Pointer.call(this, {
    handleDownEvent: ol.interaction.DragRotateAndZoom.handleDownEvent_,
    handleDragEvent: ol.interaction.DragRotateAndZoom.handleDragEvent_,
    handleUpEvent: ol.interaction.DragRotateAndZoom.handleUpEvent_
  });

  /**
   * @private
   * @type {ol.EventsConditionType}
   */
  this.condition_ = options.condition ?
      options.condition : ol.events.condition.shiftKeyOnly;

  /**
   * @private
   * @type {number|undefined}
   */
  this.lastAngle_ = undefined;

  /**
   * @private
   * @type {number|undefined}
   */
  this.lastMagnitude_ = undefined;

  /**
   * @private
   * @type {number}
   */
  this.lastScaleDelta_ = 0;

  /**
   * @private
   * @type {number}
   */
  this.duration_ = options.duration !== undefined ? options.duration : 400;

};
ol.inherits(ol.interaction.DragRotateAndZoom, ol.interaction.Pointer);


/**
 * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
 * @this {ol.interaction.DragRotateAndZoom}
 * @private
 */
ol.interaction.DragRotateAndZoom.handleDragEvent_ = function(mapBrowserEvent) {
  if (!ol.events.condition.mouseOnly(mapBrowserEvent)) {
    return;
  }

  var map = mapBrowserEvent.map;
  var size = map.getSize();
  var offset = mapBrowserEvent.pixel;
  var deltaX = offset[0] - size[0] / 2;
  var deltaY = size[1] / 2 - offset[1];
  var theta = Math.atan2(deltaY, deltaX);
  var magnitude = Math.sqrt(deltaX * deltaX + deltaY * deltaY);
  var view = map.getView();
  if (this.lastAngle_ !== undefined) {
    var angleDelta = theta - this.lastAngle_;
    ol.interaction.Interaction.rotateWithoutConstraints(
        map, view, view.getRotation() - angleDelta);
  }
  this.lastAngle_ = theta;
  if (this.lastMagnitude_ !== undefined) {
    var resolution = this.lastMagnitude_ * (view.getResolution() / magnitude);
    ol.interaction.Interaction.zoomWithoutConstraints(map, view, resolution);
  }
  if (this.lastMagnitude_ !== undefined) {
    this.lastScaleDelta_ = this.lastMagnitude_ / magnitude;
  }
  this.lastMagnitude_ = magnitude;
};


/**
 * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
 * @return {boolean} Stop drag sequence?
 * @this {ol.interaction.DragRotateAndZoom}
 * @private
 */
ol.interaction.DragRotateAndZoom.handleUpEvent_ = function(mapBrowserEvent) {
  if (!ol.events.condition.mouseOnly(mapBrowserEvent)) {
    return true;
  }

  var map = mapBrowserEvent.map;
  var view = map.getView();
  view.setHint(ol.View.Hint.INTERACTING, -1);
  var direction = this.lastScaleDelta_ - 1;
  ol.interaction.Interaction.rotate(map, view, view.getRotation());
  ol.interaction.Interaction.zoom(map, view, view.getResolution(),
      undefined, this.duration_, direction);
  this.lastScaleDelta_ = 0;
  return false;
};


/**
 * @param {ol.MapBrowserPointerEvent} mapBrowserEvent Event.
 * @return {boolean} Start drag sequence?
 * @this {ol.interaction.DragRotateAndZoom}
 * @private
 */
ol.interaction.DragRotateAndZoom.handleDownEvent_ = function(mapBrowserEvent) {
  if (!ol.events.condition.mouseOnly(mapBrowserEvent)) {
    return false;
  }

  if (this.condition_(mapBrowserEvent)) {
    mapBrowserEvent.map.getView().setHint(ol.View.Hint.INTERACTING, 1);
    this.lastAngle_ = undefined;
    this.lastMagnitude_ = undefined;
    return true;
  } else {
    return false;
  }
};

goog.provide('ol.loadingstrategy');


/**
 * Strategy function for loading all features with a single request.
 * @param {ol.Extent} extent Extent.
 * @param {number} resolution Resolution.
 * @return {Array.<ol.Extent>} Extents.
 * @api
 */
ol.loadingstrategy.all = function(extent, resolution) {
  return [[-Infinity, -Infinity, Infinity, Infinity]];
};


/**
 * Strategy function for loading features based on the view's extent and
 * resolution.
 * @param {ol.Extent} extent Extent.
 * @param {number} resolution Resolution.
 * @return {Array.<ol.Extent>} Extents.
 * @api
 */
ol.loadingstrategy.bbox = function(extent, resolution) {
  return [extent];
};


/**
 * Creates a strategy function for loading features based on a tile grid.
 * @param {ol.tilegrid.TileGrid} tileGrid Tile grid.
 * @return {function(ol.Extent, number): Array.<ol.Extent>} Loading strategy.
 * @api
 */
ol.loadingstrategy.tile = function(tileGrid) {
  return (
      /**
       * @param {ol.Extent} extent Extent.
       * @param {number} resolution Resolution.
       * @return {Array.<ol.Extent>} Extents.
       */
      function(extent, resolution) {
        var z = tileGrid.getZForResolution(resolution);
        var tileRange = tileGrid.getTileRangeForExtentAndZ(extent, z);
        /** @type {Array.<ol.Extent>} */
        var extents = [];
        /** @type {ol.TileCoord} */
        var tileCoord = [z, 0, 0];
        for (tileCoord[1] = tileRange.minX; tileCoord[1] <= tileRange.maxX;
             ++tileCoord[1]) {
          for (tileCoord[2] = tileRange.minY; tileCoord[2] <= tileRange.maxY;
               ++tileCoord[2]) {
            extents.push(tileGrid.getTileCoordExtent(tileCoord));
          }
        }
        return extents;
      });
};

goog.provide('ol.ext.rbush');
/** @typedef {function(*)} */
ol.ext.rbush;
(function() {
var exports = {};
var module = {exports: exports};
var define;
/**
 * @fileoverview
 * @suppress {accessControls, ambiguousFunctionDecl, checkDebuggerStatement, checkRegExp, checkTypes, checkVars, const, constantProperty, deprecated, duplicate, es5Strict, fileoverviewTags, missingProperties, nonStandardJsDocs, strictModuleDepCheck, suspiciousCode, undefinedNames, undefinedVars, unknownDefines, uselessCode, visibility}
 */
(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.rbush = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(_dereq_,module,exports){
'use strict';

module.exports = partialSort;

// Floyd-Rivest selection algorithm:
// Rearrange items so that all items in the [left, k] range are smaller than all items in (k, right];
// The k-th element will have the (k - left + 1)th smallest value in [left, right]

function partialSort(arr, k, left, right, compare) {
    left = left || 0;
    right = right || (arr.length - 1);
    compare = compare || defaultCompare;

    while (right > left) {
        if (right - left > 600) {
            var n = right - left + 1;
            var m = k - left + 1;
            var z = Math.log(n);
            var s = 0.5 * Math.exp(2 * z / 3);
            var sd = 0.5 * Math.sqrt(z * s * (n - s) / n) * (m - n / 2 < 0 ? -1 : 1);
            var newLeft = Math.max(left, Math.floor(k - m * s / n + sd));
            var newRight = Math.min(right, Math.floor(k + (n - m) * s / n + sd));
            partialSort(arr, k, newLeft, newRight, compare);
        }

        var t = arr[k];
        var i = left;
        var j = right;

        swap(arr, left, k);
        if (compare(arr[right], t) > 0) swap(arr, left, right);

        while (i < j) {
            swap(arr, i, j);
            i++;
            j--;
            while (compare(arr[i], t) < 0) i++;
            while (compare(arr[j], t) > 0) j--;
        }

        if (compare(arr[left], t) === 0) swap(arr, left, j);
        else {
            j++;
            swap(arr, j, right);
        }

        if (j <= k) left = j + 1;
        if (k <= j) right = j - 1;
    }
}

function swap(arr, i, j) {
    var tmp = arr[i];
    arr[i] = arr[j];
    arr[j] = tmp;
}

function defaultCompare(a, b) {
    return a < b ? -1 : a > b ? 1 : 0;
}

},{}],2:[function(_dereq_,module,exports){
'use strict';

module.exports = rbush;

var quickselect = _dereq_('quickselect');

function rbush(maxEntries, format) {
    if (!(this instanceof rbush)) return new rbush(maxEntries, format);

    // max entries in a node is 9 by default; min node fill is 40% for best performance
    this._maxEntries = Math.max(4, maxEntries || 9);
    this._minEntries = Math.max(2, Math.ceil(this._maxEntries * 0.4));

    if (format) {
        this._initFormat(format);
    }

    this.clear();
}

rbush.prototype = {

    all: function () {
        return this._all(this.data, []);
    },

    search: function (bbox) {

        var node = this.data,
            result = [],
            toBBox = this.toBBox;

        if (!intersects(bbox, node)) return result;

        var nodesToSearch = [],
            i, len, child, childBBox;

        while (node) {
            for (i = 0, len = node.children.length; i < len; i++) {

                child = node.children[i];
                childBBox = node.leaf ? toBBox(child) : child;

                if (intersects(bbox, childBBox)) {
                    if (node.leaf) result.push(child);
                    else if (contains(bbox, childBBox)) this._all(child, result);
                    else nodesToSearch.push(child);
                }
            }
            node = nodesToSearch.pop();
        }

        return result;
    },

    collides: function (bbox) {

        var node = this.data,
            toBBox = this.toBBox;

        if (!intersects(bbox, node)) return false;

        var nodesToSearch = [],
            i, len, child, childBBox;

        while (node) {
            for (i = 0, len = node.children.length; i < len; i++) {

                child = node.children[i];
                childBBox = node.leaf ? toBBox(child) : child;

                if (intersects(bbox, childBBox)) {
                    if (node.leaf || contains(bbox, childBBox)) return true;
                    nodesToSearch.push(child);
                }
            }
            node = nodesToSearch.pop();
        }

        return false;
    },

    load: function (data) {
        if (!(data && data.length)) return this;

        if (data.length < this._minEntries) {
            for (var i = 0, len = data.length; i < len; i++) {
                this.insert(data[i]);
            }
            return this;
        }

        // recursively build the tree with the given data from stratch using OMT algorithm
        var node = this._build(data.slice(), 0, data.length - 1, 0);

        if (!this.data.children.length) {
            // save as is if tree is empty
            this.data = node;

        } else if (this.data.height === node.height) {
            // split root if trees have the same height
            this._splitRoot(this.data, node);

        } else {
            if (this.data.height < node.height) {
                // swap trees if inserted one is bigger
                var tmpNode = this.data;
                this.data = node;
                node = tmpNode;
            }

            // insert the small tree into the large tree at appropriate level
            this._insert(node, this.data.height - node.height - 1, true);
        }

        return this;
    },

    insert: function (item) {
        if (item) this._insert(item, this.data.height - 1);
        return this;
    },

    clear: function () {
        this.data = createNode([]);
        return this;
    },

    remove: function (item, equalsFn) {
        if (!item) return this;

        var node = this.data,
            bbox = this.toBBox(item),
            path = [],
            indexes = [],
            i, parent, index, goingUp;

        // depth-first iterative tree traversal
        while (node || path.length) {

            if (!node) { // go up
                node = path.pop();
                parent = path[path.length - 1];
                i = indexes.pop();
                goingUp = true;
            }

            if (node.leaf) { // check current node
                index = findItem(item, node.children, equalsFn);

                if (index !== -1) {
                    // item found, remove the item and condense tree upwards
                    node.children.splice(index, 1);
                    path.push(node);
                    this._condense(path);
                    return this;
                }
            }

            if (!goingUp && !node.leaf && contains(node, bbox)) { // go down
                path.push(node);
                indexes.push(i);
                i = 0;
                parent = node;
                node = node.children[0];

            } else if (parent) { // go right
                i++;
                node = parent.children[i];
                goingUp = false;

            } else node = null; // nothing found
        }

        return this;
    },

    toBBox: function (item) { return item; },

    compareMinX: compareNodeMinX,
    compareMinY: compareNodeMinY,

    toJSON: function () { return this.data; },

    fromJSON: function (data) {
        this.data = data;
        return this;
    },

    _all: function (node, result) {
        var nodesToSearch = [];
        while (node) {
            if (node.leaf) result.push.apply(result, node.children);
            else nodesToSearch.push.apply(nodesToSearch, node.children);

            node = nodesToSearch.pop();
        }
        return result;
    },

    _build: function (items, left, right, height) {

        var N = right - left + 1,
            M = this._maxEntries,
            node;

        if (N <= M) {
            // reached leaf level; return leaf
            node = createNode(items.slice(left, right + 1));
            calcBBox(node, this.toBBox);
            return node;
        }

        if (!height) {
            // target height of the bulk-loaded tree
            height = Math.ceil(Math.log(N) / Math.log(M));

            // target number of root entries to maximize storage utilization
            M = Math.ceil(N / Math.pow(M, height - 1));
        }

        node = createNode([]);
        node.leaf = false;
        node.height = height;

        // split the items into M mostly square tiles

        var N2 = Math.ceil(N / M),
            N1 = N2 * Math.ceil(Math.sqrt(M)),
            i, j, right2, right3;

        multiSelect(items, left, right, N1, this.compareMinX);

        for (i = left; i <= right; i += N1) {

            right2 = Math.min(i + N1 - 1, right);

            multiSelect(items, i, right2, N2, this.compareMinY);

            for (j = i; j <= right2; j += N2) {

                right3 = Math.min(j + N2 - 1, right2);

                // pack each entry recursively
                node.children.push(this._build(items, j, right3, height - 1));
            }
        }

        calcBBox(node, this.toBBox);

        return node;
    },

    _chooseSubtree: function (bbox, node, level, path) {

        var i, len, child, targetNode, area, enlargement, minArea, minEnlargement;

        while (true) {
            path.push(node);

            if (node.leaf || path.length - 1 === level) break;

            minArea = minEnlargement = Infinity;

            for (i = 0, len = node.children.length; i < len; i++) {
                child = node.children[i];
                area = bboxArea(child);
                enlargement = enlargedArea(bbox, child) - area;

                // choose entry with the least area enlargement
                if (enlargement < minEnlargement) {
                    minEnlargement = enlargement;
                    minArea = area < minArea ? area : minArea;
                    targetNode = child;

                } else if (enlargement === minEnlargement) {
                    // otherwise choose one with the smallest area
                    if (area < minArea) {
                        minArea = area;
                        targetNode = child;
                    }
                }
            }

            node = targetNode || node.children[0];
        }

        return node;
    },

    _insert: function (item, level, isNode) {

        var toBBox = this.toBBox,
            bbox = isNode ? item : toBBox(item),
            insertPath = [];

        // find the best node for accommodating the item, saving all nodes along the path too
        var node = this._chooseSubtree(bbox, this.data, level, insertPath);

        // put the item into the node
        node.children.push(item);
        extend(node, bbox);

        // split on node overflow; propagate upwards if necessary
        while (level >= 0) {
            if (insertPath[level].children.length > this._maxEntries) {
                this._split(insertPath, level);
                level--;
            } else break;
        }

        // adjust bboxes along the insertion path
        this._adjustParentBBoxes(bbox, insertPath, level);
    },

    // split overflowed node into two
    _split: function (insertPath, level) {

        var node = insertPath[level],
            M = node.children.length,
            m = this._minEntries;

        this._chooseSplitAxis(node, m, M);

        var splitIndex = this._chooseSplitIndex(node, m, M);

        var newNode = createNode(node.children.splice(splitIndex, node.children.length - splitIndex));
        newNode.height = node.height;
        newNode.leaf = node.leaf;

        calcBBox(node, this.toBBox);
        calcBBox(newNode, this.toBBox);

        if (level) insertPath[level - 1].children.push(newNode);
        else this._splitRoot(node, newNode);
    },

    _splitRoot: function (node, newNode) {
        // split root node
        this.data = createNode([node, newNode]);
        this.data.height = node.height + 1;
        this.data.leaf = false;
        calcBBox(this.data, this.toBBox);
    },

    _chooseSplitIndex: function (node, m, M) {

        var i, bbox1, bbox2, overlap, area, minOverlap, minArea, index;

        minOverlap = minArea = Infinity;

        for (i = m; i <= M - m; i++) {
            bbox1 = distBBox(node, 0, i, this.toBBox);
            bbox2 = distBBox(node, i, M, this.toBBox);

            overlap = intersectionArea(bbox1, bbox2);
            area = bboxArea(bbox1) + bboxArea(bbox2);

            // choose distribution with minimum overlap
            if (overlap < minOverlap) {
                minOverlap = overlap;
                index = i;

                minArea = area < minArea ? area : minArea;

            } else if (overlap === minOverlap) {
                // otherwise choose distribution with minimum area
                if (area < minArea) {
                    minArea = area;
                    index = i;
                }
            }
        }

        return index;
    },

    // sorts node children by the best axis for split
    _chooseSplitAxis: function (node, m, M) {

        var compareMinX = node.leaf ? this.compareMinX : compareNodeMinX,
            compareMinY = node.leaf ? this.compareMinY : compareNodeMinY,
            xMargin = this._allDistMargin(node, m, M, compareMinX),
            yMargin = this._allDistMargin(node, m, M, compareMinY);

        // if total distributions margin value is minimal for x, sort by minX,
        // otherwise it's already sorted by minY
        if (xMargin < yMargin) node.children.sort(compareMinX);
    },

    // total margin of all possible split distributions where each node is at least m full
    _allDistMargin: function (node, m, M, compare) {

        node.children.sort(compare);

        var toBBox = this.toBBox,
            leftBBox = distBBox(node, 0, m, toBBox),
            rightBBox = distBBox(node, M - m, M, toBBox),
            margin = bboxMargin(leftBBox) + bboxMargin(rightBBox),
            i, child;

        for (i = m; i < M - m; i++) {
            child = node.children[i];
            extend(leftBBox, node.leaf ? toBBox(child) : child);
            margin += bboxMargin(leftBBox);
        }

        for (i = M - m - 1; i >= m; i--) {
            child = node.children[i];
            extend(rightBBox, node.leaf ? toBBox(child) : child);
            margin += bboxMargin(rightBBox);
        }

        return margin;
    },

    _adjustParentBBoxes: function (bbox, path, level) {
        // adjust bboxes along the given tree path
        for (var i = level; i >= 0; i--) {
            extend(path[i], bbox);
        }
    },

    _condense: function (path) {
        // go through the path, removing empty nodes and updating bboxes
        for (var i = path.length - 1, siblings; i >= 0; i--) {
            if (path[i].children.length === 0) {
                if (i > 0) {
                    siblings = path[i - 1].children;
                    siblings.splice(siblings.indexOf(path[i]), 1);

                } else this.clear();

            } else calcBBox(path[i], this.toBBox);
        }
    },

    _initFormat: function (format) {
        // data format (minX, minY, maxX, maxY accessors)

        // uses eval-type function compilation instead of just accepting a toBBox function
        // because the algorithms are very sensitive to sorting functions performance,
        // so they should be dead simple and without inner calls

        var compareArr = ['return a', ' - b', ';'];

        this.compareMinX = new Function('a', 'b', compareArr.join(format[0]));
        this.compareMinY = new Function('a', 'b', compareArr.join(format[1]));

        this.toBBox = new Function('a',
            'return {minX: a' + format[0] +
            ', minY: a' + format[1] +
            ', maxX: a' + format[2] +
            ', maxY: a' + format[3] + '};');
    }
};

function findItem(item, items, equalsFn) {
    if (!equalsFn) return items.indexOf(item);

    for (var i = 0; i < items.length; i++) {
        if (equalsFn(item, items[i])) return i;
    }
    return -1;
}

// calculate node's bbox from bboxes of its children
function calcBBox(node, toBBox) {
    distBBox(node, 0, node.children.length, toBBox, node);
}

// min bounding rectangle of node children from k to p-1
function distBBox(node, k, p, toBBox, destNode) {
    if (!destNode) destNode = createNode(null);
    destNode.minX = Infinity;
    destNode.minY = Infinity;
    destNode.maxX = -Infinity;
    destNode.maxY = -Infinity;

    for (var i = k, child; i < p; i++) {
        child = node.children[i];
        extend(destNode, node.leaf ? toBBox(child) : child);
    }

    return destNode;
}

function extend(a, b) {
    a.minX = Math.min(a.minX, b.minX);
    a.minY = Math.min(a.minY, b.minY);
    a.maxX = Math.max(a.maxX, b.maxX);
    a.maxY = Math.max(a.maxY, b.maxY);
    return a;
}

function compareNodeMinX(a, b) { return a.minX - b.minX; }
function compareNodeMinY(a, b) { return a.minY - b.minY; }

function bboxArea(a)   { return (a.maxX - a.minX) * (a.maxY - a.minY); }
function bboxMargin(a) { return (a.maxX - a.minX) + (a.maxY - a.minY); }

function enlargedArea(a, b) {
    return (Math.max(b.maxX, a.maxX) - Math.min(b.minX, a.minX)) *
           (Math.max(b.maxY, a.maxY) - Math.min(b.minY, a.minY));
}

function intersectionArea(a, b) {
    var minX = Math.max(a.minX, b.minX),
        minY = Math.max(a.minY, b.minY),
        maxX = Math.min(a.maxX, b.maxX),
        maxY = Math.min(a.maxY, b.maxY);

    return Math.max(0, maxX - minX) *
           Math.max(0, maxY - minY);
}

function contains(a, b) {
    return a.minX <= b.minX &&
           a.minY <= b.minY &&
           b.maxX <= a.maxX &&
           b.maxY <= a.maxY;
}

function intersects(a, b) {
    return b.minX <= a.maxX &&
           b.minY <= a.maxY &&
           b.maxX >= a.minX &&
           b.maxY >= a.minY;
}

function createNode(children) {
    return {
        children: children,
        height: 1,
        leaf: true,
        minX: Infinity,
        minY: Infinity,
        maxX: -Infinity,
        maxY: -Infinity
    };
}

// sort an array so that items come in groups of n unsorted items, with groups sorted between each other;
// combines selection algorithm with binary divide & conquer approach

function multiSelect(arr, left, right, n, compare) {
    var stack = [left, right],
        mid;

    while (stack.length) {
        right = stack.pop();
        left = stack.pop();

        if (right - left <= n) continue;

        mid = left + Math.ceil((right - left) / n / 2) * n;
        quickselect(arr, mid, left, right, compare);

        stack.push(left, mid, mid, right);
    }
}

},{"quickselect":1}]},{},[2])(2)
});
ol.ext.rbush = module.exports;
})();

goog.provide('ol.structs.RBush');

goog.require('ol');
goog.require('ol.ext.rbush');
goog.require('ol.extent');
goog.require('ol.obj');


/**
 * Wrapper around the RBush by Vladimir Agafonkin.
 *
 * @constructor
 * @param {number=} opt_maxEntries Max entries.
 * @see https://github.com/mourner/rbush
 * @struct
 * @template T
 */
ol.structs.RBush = function(opt_maxEntries) {

  /**
   * @private
   */
  this.rbush_ = ol.ext.rbush(opt_maxEntries);

  /**
   * A mapping between the objects added to this rbush wrapper
   * and the objects that are actually added to the internal rbush.
   * @private
   * @type {Object.<number, ol.RBushEntry>}
   */
  this.items_ = {};

  if (goog.DEBUG) {
    /**
     * @private
     * @type {number}
     */
    this.readers_ = 0;
  }
};


/**
 * Insert a value into the RBush.
 * @param {ol.Extent} extent Extent.
 * @param {T} value Value.
 */
ol.structs.RBush.prototype.insert = function(extent, value) {
  if (goog.DEBUG && this.readers_) {
    throw new Error('Can not insert value while reading');
  }
  /** @type {ol.RBushEntry} */
  var item = {
    minX: extent[0],
    minY: extent[1],
    maxX: extent[2],
    maxY: extent[3],
    value: value
  };

  this.rbush_.insert(item);
  // remember the object that was added to the internal rbush
  goog.DEBUG && console.assert(!(ol.getUid(value) in this.items_),
      'uid (%s) of value (%s) already exists', ol.getUid(value), value);
  this.items_[ol.getUid(value)] = item;
};


/**
 * Bulk-insert values into the RBush.
 * @param {Array.<ol.Extent>} extents Extents.
 * @param {Array.<T>} values Values.
 */
ol.structs.RBush.prototype.load = function(extents, values) {
  if (goog.DEBUG && this.readers_) {
    throw new Error('Can not insert values while reading');
  }
  goog.DEBUG && console.assert(extents.length === values.length,
      'extens and values must have same length (%s === %s)',
      extents.length, values.length);

  var items = new Array(values.length);
  for (var i = 0, l = values.length; i < l; i++) {
    var extent = extents[i];
    var value = values[i];

    /** @type {ol.RBushEntry} */
    var item = {
      minX: extent[0],
      minY: extent[1],
      maxX: extent[2],
      maxY: extent[3],
      value: value
    };
    items[i] = item;
    goog.DEBUG && console.assert(!(ol.getUid(value) in this.items_),
        'uid (%s) of value (%s) already exists', ol.getUid(value), value);
    this.items_[ol.getUid(value)] = item;
  }
  this.rbush_.load(items);
};


/**
 * Remove a value from the RBush.
 * @param {T} value Value.
 * @return {boolean} Removed.
 */
ol.structs.RBush.prototype.remove = function(value) {
  if (goog.DEBUG && this.readers_) {
    throw new Error('Can not remove value while reading');
  }
  var uid = ol.getUid(value);
  goog.DEBUG && console.assert(uid in this.items_,
      'uid (%s) of value (%s) does not exist', uid, value);

  // get the object in which the value was wrapped when adding to the
  // internal rbush. then use that object to do the removal.
  var item = this.items_[uid];
  delete this.items_[uid];
  return this.rbush_.remove(item) !== null;
};


/**
 * Update the extent of a value in the RBush.
 * @param {ol.Extent} extent Extent.
 * @param {T} value Value.
 */
ol.structs.RBush.prototype.update = function(extent, value) {
  goog.DEBUG && console.assert(ol.getUid(value) in this.items_,
      'uid (%s) of value (%s) does not exist', ol.getUid(value), value);

  var item = this.items_[ol.getUid(value)];
  var bbox = [item.minX, item.minY, item.maxX, item.maxY];
  if (!ol.extent.equals(bbox, extent)) {
    if (goog.DEBUG && this.readers_) {
      throw new Error('Can not update extent while reading');
    }
    this.remove(value);
    this.insert(extent, value);
  }
};


/**
 * Return all values in the RBush.
 * @return {Array.<T>} All.
 */
ol.structs.RBush.prototype.getAll = function() {
  var items = this.rbush_.all();
  return items.map(function(item) {
    return item.value;
  });
};


/**
 * Return all values in the given extent.
 * @param {ol.Extent} extent Extent.
 * @return {Array.<T>} All in extent.
 */
ol.structs.RBush.prototype.getInExtent = function(extent) {
  /** @type {ol.RBushEntry} */
  var bbox = {
    minX: extent[0],
    minY: extent[1],
    maxX: extent[2],
    maxY: extent[3]
  };
  var items = this.rbush_.search(bbox);
  return items.map(function(item) {
    return item.value;
  });
};


/**
 * Calls a callback function with each value in the tree.
 * If the callback returns a truthy value, this value is returned without
 * checking the rest of the tree.
 * @param {function(this: S, T): *} callback Callback.
 * @param {S=} opt_this The object to use as `this` in `callback`.
 * @return {*} Callback return value.
 * @template S
 */
ol.structs.RBush.prototype.forEach = function(callback, opt_this) {
  if (goog.DEBUG) {
    ++this.readers_;
    try {
      return this.forEach_(this.getAll(), callback, opt_this);
    } finally {
      --this.readers_;
    }
  } else {
    return this.forEach_(this.getAll(), callback, opt_this);
  }
};


/**
 * Calls a callback function with each value in the provided extent.
 * @param {ol.Extent} extent Extent.
 * @param {function(this: S, T): *} callback Callback.
 * @param {S=} opt_this The object to use as `this` in `callback`.
 * @return {*} Callback return value.
 * @template S
 */
ol.structs.RBush.prototype.forEachInExtent = function(extent, callback, opt_this) {
  if (goog.DEBUG) {
    ++this.readers_;
    try {
      return this.forEach_(this.getInExtent(extent), callback, opt_this);
    } finally {
      --this.readers_;
    }
  } else {
    return this.forEach_(this.getInExtent(extent), callback, opt_this);
  }
};


/**
 * @param {Array.<T>} values Values.
 * @param {function(this: S, T): *} callback Callback.
 * @param {S=} opt_this The object to use as `this` in `callback`.
 * @private
 * @return {*} Callback return value.
 * @template S
 */
ol.structs.RBush.prototype.forEach_ = function(values, callback, opt_this) {
  var result;
  for (var i = 0, l = values.length; i < l; i++) {
    result = callback.call(opt_this, values[i]);
    if (result) {
      return result;
    }
  }
  return result;
};


/**
 * @return {boolean} Is empty.
 */
ol.structs.RBush.prototype.isEmpty = function() {
  return ol.obj.isEmpty(this.items_);
};


/**
 * Remove all values from the RBush.
 */
ol.structs.RBush.prototype.clear = function() {
  this.rbush_.clear();
  this.items_ = {};
};


/**
 * @param {ol.Extent=} opt_extent Extent.
 * @return {!ol.Extent} Extent.
 */
ol.structs.RBush.prototype.getExtent = function(opt_extent) {
  // FIXME add getExtent() to rbush
  var data = this.rbush_.data;
  return [data.minX, data.minY, data.maxX, data.maxY];
};

// FIXME bulk feature upload - suppress events
// FIXME make change-detection more refined (notably, geometry hint)

goog.provide('ol.source.Vector');
goog.provide('ol.source.VectorEvent');
goog.provide('ol.source.VectorEventType');

goog.require('ol');
goog.require('ol.Collection');
goog.require('ol.ObjectEventType');
goog.require('ol.array');
goog.require('ol.asserts');
goog.require('ol.events');
goog.require('ol.events.Event');
goog.require('ol.events.EventType');
goog.require('ol.extent');
goog.require('ol.featureloader');
goog.require('ol.functions');
goog.require('ol.loadingstrategy');
goog.require('ol.obj');
goog.require('ol.source.Source');
goog.require('ol.source.State');
goog.require('ol.structs.RBush');


/**
 * @enum {string}
 */
ol.source.VectorEventType = {
  /**
   * Triggered when a feature is added to the source.
   * @event ol.source.VectorEvent#addfeature
   * @api stable
   */
  ADDFEATURE: 'addfeature',

  /**
   * Triggered when a feature is updated.
   * @event ol.source.VectorEvent#changefeature
   * @api
   */
  CHANGEFEATURE: 'changefeature',

  /**
   * Triggered when the clear method is called on the source.
   * @event ol.source.VectorEvent#clear
   * @api
   */
  CLEAR: 'clear',

  /**
   * Triggered when a feature is removed from the source.
   * See {@link ol.source.Vector#clear source.clear()} for exceptions.
   * @event ol.source.VectorEvent#removefeature
   * @api stable
   */
  REMOVEFEATURE: 'removefeature'
};


/**
 * @classdesc
 * Provides a source of features for vector layers. Vector features provided
 * by this source are suitable for editing. See {@link ol.source.VectorTile} for
 * vector data that is optimized for rendering.
 *
 * @constructor
 * @extends {ol.source.Source}
 * @fires ol.source.VectorEvent
 * @param {olx.source.VectorOptions=} opt_options Vector source options.
 * @api stable
 */
ol.source.Vector = function(opt_options) {

  var options = opt_options || {};

  ol.source.Source.call(this, {
    attributions: options.attributions,
    logo: options.logo,
    projection: undefined,
    state: ol.source.State.READY,
    wrapX: options.wrapX !== undefined ? options.wrapX : true
  });

  /**
   * @private
   * @type {ol.FeatureLoader}
   */
  this.loader_ = ol.nullFunction;

  /**
   * @private
   * @type {ol.format.Feature|undefined}
   */
  this.format_ = options.format;

  /**
   * @private
   * @type {boolean}
   */
  this.overlaps_ = options.overlaps == undefined ? true : options.overlaps;

  /**
   * @private
   * @type {string|ol.FeatureUrlFunction|undefined}
   */
  this.url_ = options.url;

  if (options.loader !== undefined) {
    this.loader_ = options.loader;
  } else if (this.url_ !== undefined) {
    ol.asserts.assert(this.format_, 7); // `format` must be set when `url` is set
    // create a XHR feature loader for "url" and "format"
    this.loader_ = ol.featureloader.xhr(this.url_, /** @type {ol.format.Feature} */ (this.format_));
  }

  /**
   * @private
   * @type {ol.LoadingStrategy}
   */
  this.strategy_ = options.strategy !== undefined ? options.strategy :
      ol.loadingstrategy.all;

  var useSpatialIndex =
      options.useSpatialIndex !== undefined ? options.useSpatialIndex : true;

  /**
   * @private
   * @type {ol.structs.RBush.<ol.Feature>}
   */
  this.featuresRtree_ = useSpatialIndex ? new ol.structs.RBush() : null;

  /**
   * @private
   * @type {ol.structs.RBush.<{extent: ol.Extent}>}
   */
  this.loadedExtentsRtree_ = new ol.structs.RBush();

  /**
   * @private
   * @type {Object.<string, ol.Feature>}
   */
  this.nullGeometryFeatures_ = {};

  /**
   * A lookup of features by id (the return from feature.getId()).
   * @private
   * @type {Object.<string, ol.Feature>}
   */
  this.idIndex_ = {};

  /**
   * A lookup of features without id (keyed by ol.getUid(feature)).
   * @private
   * @type {Object.<string, ol.Feature>}
   */
  this.undefIdIndex_ = {};

  /**
   * @private
   * @type {Object.<string, Array.<ol.EventsKey>>}
   */
  this.featureChangeKeys_ = {};

  /**
   * @private
   * @type {ol.Collection.<ol.Feature>}
   */
  this.featuresCollection_ = null;

  var collection, features;
  if (options.features instanceof ol.Collection) {
    collection = options.features;
    features = collection.getArray();
  } else if (Array.isArray(options.features)) {
    features = options.features;
  }
  if (!useSpatialIndex && collection === undefined) {
    collection = new ol.Collection(features);
  }
  if (features !== undefined) {
    this.addFeaturesInternal(features);
  }
  if (collection !== undefined) {
    this.bindFeaturesCollection_(collection);
  }

};
ol.inherits(ol.source.Vector, ol.source.Source);


/**
 * Add a single feature to the source.  If you want to add a batch of features
 * at once, call {@link ol.source.Vector#addFeatures source.addFeatures()}
 * instead.
 * @param {ol.Feature} feature Feature to add.
 * @api stable
 */
ol.source.Vector.prototype.addFeature = function(feature) {
  this.addFeatureInternal(feature);
  this.changed();
};


/**
 * Add a feature without firing a `change` event.
 * @param {ol.Feature} feature Feature.
 * @protected
 */
ol.source.Vector.prototype.addFeatureInternal = function(feature) {
  var featureKey = ol.getUid(feature).toString();

  if (!this.addToIndex_(featureKey, feature)) {
    return;
  }

  this.setupChangeEvents_(featureKey, feature);

  var geometry = feature.getGeometry();
  if (geometry) {
    var extent = geometry.getExtent();
    if (this.featuresRtree_) {
      this.featuresRtree_.insert(extent, feature);
    }
  } else {
    this.nullGeometryFeatures_[featureKey] = feature;
  }

  this.dispatchEvent(
      new ol.source.VectorEvent(ol.source.VectorEventType.ADDFEATURE, feature));
};


/**
 * @param {string} featureKey Unique identifier for the feature.
 * @param {ol.Feature} feature The feature.
 * @private
 */
ol.source.Vector.prototype.setupChangeEvents_ = function(featureKey, feature) {
  goog.DEBUG && console.assert(!(featureKey in this.featureChangeKeys_),
      'key (%s) not yet registered in featureChangeKey', featureKey);
  this.featureChangeKeys_[featureKey] = [
    ol.events.listen(feature, ol.events.EventType.CHANGE,
        this.handleFeatureChange_, this),
    ol.events.listen(feature, ol.ObjectEventType.PROPERTYCHANGE,
        this.handleFeatureChange_, this)
  ];
};


/**
 * @param {string} featureKey Unique identifier for the feature.
 * @param {ol.Feature} feature The feature.
 * @return {boolean} The feature is "valid", in the sense that it is also a
 *     candidate for insertion into the Rtree.
 * @private
 */
ol.source.Vector.prototype.addToIndex_ = function(featureKey, feature) {
  var valid = true;
  var id = feature.getId();
  if (id !== undefined) {
    if (!(id.toString() in this.idIndex_)) {
      this.idIndex_[id.toString()] = feature;
    } else {
      valid = false;
    }
  } else {
    ol.asserts.assert(!(featureKey in this.undefIdIndex_),
        30); // The passed `feature` was already added to the source
    this.undefIdIndex_[featureKey] = feature;
  }
  return valid;
};


/**
 * Add a batch of features to the source.
 * @param {Array.<ol.Feature>} features Features to add.
 * @api stable
 */
ol.source.Vector.prototype.addFeatures = function(features) {
  this.addFeaturesInternal(features);
  this.changed();
};


/**
 * Add features without firing a `change` event.
 * @param {Array.<ol.Feature>} features Features.
 * @protected
 */
ol.source.Vector.prototype.addFeaturesInternal = function(features) {
  var featureKey, i, length, feature;

  var extents = [];
  var newFeatures = [];
  var geometryFeatures = [];

  for (i = 0, length = features.length; i < length; i++) {
    feature = features[i];
    featureKey = ol.getUid(feature).toString();
    if (this.addToIndex_(featureKey, feature)) {
      newFeatures.push(feature);
    }
  }

  for (i = 0, length = newFeatures.length; i < length; i++) {
    feature = newFeatures[i];
    featureKey = ol.getUid(feature).toString();
    this.setupChangeEvents_(featureKey, feature);

    var geometry = feature.getGeometry();
    if (geometry) {
      var extent = geometry.getExtent();
      extents.push(extent);
      geometryFeatures.push(feature);
    } else {
      this.nullGeometryFeatures_[featureKey] = feature;
    }
  }
  if (this.featuresRtree_) {
    this.featuresRtree_.load(extents, geometryFeatures);
  }

  for (i = 0, length = newFeatures.length; i < length; i++) {
    this.dispatchEvent(new ol.source.VectorEvent(
        ol.source.VectorEventType.ADDFEATURE, newFeatures[i]));
  }
};


/**
 * @param {!ol.Collection.<ol.Feature>} collection Collection.
 * @private
 */
ol.source.Vector.prototype.bindFeaturesCollection_ = function(collection) {
  goog.DEBUG && console.assert(!this.featuresCollection_,
      'bindFeaturesCollection can only be called once');
  var modifyingCollection = false;
  ol.events.listen(this, ol.source.VectorEventType.ADDFEATURE,
      function(evt) {
        if (!modifyingCollection) {
          modifyingCollection = true;
          collection.push(evt.feature);
          modifyingCollection = false;
        }
      });
  ol.events.listen(this, ol.source.VectorEventType.REMOVEFEATURE,
      function(evt) {
        if (!modifyingCollection) {
          modifyingCollection = true;
          collection.remove(evt.feature);
          modifyingCollection = false;
        }
      });
  ol.events.listen(collection, ol.Collection.EventType.ADD,
      function(evt) {
        if (!modifyingCollection) {
          modifyingCollection = true;
          this.addFeature(/** @type {ol.Feature} */ (evt.element));
          modifyingCollection = false;
        }
      }, this);
  ol.events.listen(collection, ol.Collection.EventType.REMOVE,
      function(evt) {
        if (!modifyingCollection) {
          modifyingCollection = true;
          this.removeFeature(/** @type {ol.Feature} */ (evt.element));
          modifyingCollection = false;
        }
      }, this);
  this.featuresCollection_ = collection;
};


/**
 * Remove all features from the source.
 * @param {boolean=} opt_fast Skip dispatching of {@link removefeature} events.
 * @api stable
 */
ol.source.Vector.prototype.clear = function(opt_fast) {
  if (opt_fast) {
    for (var featureId in this.featureChangeKeys_) {
      var keys = this.featureChangeKeys_[featureId];
      keys.forEach(ol.events.unlistenByKey);
    }
    if (!this.featuresCollection_) {
      this.featureChangeKeys_ = {};
      this.idIndex_ = {};
      this.undefIdIndex_ = {};
    }
  } else {
    if (this.featuresRtree_) {
      this.featuresRtree_.forEach(this.removeFeatureInternal, this);
      for (var id in this.nullGeometryFeatures_) {
        this.removeFeatureInternal(this.nullGeometryFeatures_[id]);
      }
    }
  }
  if (this.featuresCollection_) {
    this.featuresCollection_.clear();
  }
  goog.DEBUG && console.assert(ol.obj.isEmpty(this.featureChangeKeys_),
      'featureChangeKeys is an empty object now');
  goog.DEBUG && console.assert(ol.obj.isEmpty(this.idIndex_),
      'idIndex is an empty object now');
  goog.DEBUG && console.assert(ol.obj.isEmpty(this.undefIdIndex_),
      'undefIdIndex is an empty object now');

  if (this.featuresRtree_) {
    this.featuresRtree_.clear();
  }
  this.loadedExtentsRtree_.clear();
  this.nullGeometryFeatures_ = {};

  var clearEvent = new ol.source.VectorEvent(ol.source.VectorEventType.CLEAR);
  this.dispatchEvent(clearEvent);
  this.changed();
};


/**
 * Iterate through all features on the source, calling the provided callback
 * with each one.  If the callback returns any "truthy" value, iteration will
 * stop and the function will return the same value.
 *
 * @param {function(this: T, ol.Feature): S} callback Called with each feature
 *     on the source.  Return a truthy value to stop iteration.
 * @param {T=} opt_this The object to use as `this` in the callback.
 * @return {S|undefined} The return value from the last call to the callback.
 * @template T,S
 * @api stable
 */
ol.source.Vector.prototype.forEachFeature = function(callback, opt_this) {
  if (this.featuresRtree_) {
    return this.featuresRtree_.forEach(callback, opt_this);
  } else if (this.featuresCollection_) {
    return this.featuresCollection_.forEach(callback, opt_this);
  }
};


/**
 * Iterate through all features whose geometries contain the provided
 * coordinate, calling the callback with each feature.  If the callback returns
 * a "truthy" value, iteration will stop and the function will return the same
 * value.
 *
 * @param {ol.Coordinate} coordinate Coordinate.
 * @param {function(this: T, ol.Feature): S} callback Called with each feature
 *     whose goemetry contains the provided coordinate.
 * @param {T=} opt_this The object to use as `this` in the callback.
 * @return {S|undefined} The return value from the last call to the callback.
 * @template T,S
 */
ol.source.Vector.prototype.forEachFeatureAtCoordinateDirect = function(coordinate, callback, opt_this) {
  var extent = [coordinate[0], coordinate[1], coordinate[0], coordinate[1]];
  return this.forEachFeatureInExtent(extent, function(feature) {
    var geometry = feature.getGeometry();
    goog.DEBUG && console.assert(geometry, 'feature geometry is defined and not null');
    if (geometry.intersectsCoordinate(coordinate)) {
      return callback.call(opt_this, feature);
    } else {
      return undefined;
    }
  });
};


/**
 * Iterate through all features whose bounding box intersects the provided
 * extent (note that the feature's geometry may not intersect the extent),
 * calling the callback with each feature.  If the callback returns a "truthy"
 * value, iteration will stop and the function will return the same value.
 *
 * If you are interested in features whose geometry intersects an extent, call
 * the {@link ol.source.Vector#forEachFeatureIntersectingExtent
 * source.forEachFeatureIntersectingExtent()} method instead.
 *
 * When `useSpatialIndex` is set to false, this method will loop through all
 * features, equivalent to {@link ol.source.Vector#forEachFeature}.
 *
 * @param {ol.Extent} extent Extent.
 * @param {function(this: T, ol.Feature): S} callback Called with each feature
 *     whose bounding box intersects the provided extent.
 * @param {T=} opt_this The object to use as `this` in the callback.
 * @return {S|undefined} The return value from the last call to the callback.
 * @template T,S
 * @api
 */
ol.source.Vector.prototype.forEachFeatureInExtent = function(extent, callback, opt_this) {
  if (this.featuresRtree_) {
    return this.featuresRtree_.forEachInExtent(extent, callback, opt_this);
  } else if (this.featuresCollection_) {
    return this.featuresCollection_.forEach(callback, opt_this);
  }
};


/**
 * Iterate through all features whose geometry intersects the provided extent,
 * calling the callback with each feature.  If the callback returns a "truthy"
 * value, iteration will stop and the function will return the same value.
 *
 * If you only want to test for bounding box intersection, call the
 * {@link ol.source.Vector#forEachFeatureInExtent
 * source.forEachFeatureInExtent()} method instead.
 *
 * @param {ol.Extent} extent Extent.
 * @param {function(this: T, ol.Feature): S} callback Called with each feature
 *     whose geometry intersects the provided extent.
 * @param {T=} opt_this The object to use as `this` in the callback.
 * @return {S|undefined} The return value from the last call to the callback.
 * @template T,S
 * @api
 */
ol.source.Vector.prototype.forEachFeatureIntersectingExtent = function(extent, callback, opt_this) {
  return this.forEachFeatureInExtent(extent,
      /**
       * @param {ol.Feature} feature Feature.
       * @return {S|undefined} The return value from the last call to the callback.
       * @template S
       */
      function(feature) {
        var geometry = feature.getGeometry();
        goog.DEBUG && console.assert(geometry,
            'feature geometry is defined and not null');
        if (geometry.intersectsExtent(extent)) {
          var result = callback.call(opt_this, feature);
          if (result) {
            return result;
          }
        }
      });
};


/**
 * Get the features collection associated with this source. Will be `null`
 * unless the source was configured with `useSpatialIndex` set to `false`, or
 * with an {@link ol.Collection} as `features`.
 * @return {ol.Collection.<ol.Feature>} The collection of features.
 * @api
 */
ol.source.Vector.prototype.getFeaturesCollection = function() {
  return this.featuresCollection_;
};


/**
 * Get all features on the source.
 * @return {Array.<ol.Feature>} Features.
 * @api stable
 */
ol.source.Vector.prototype.getFeatures = function() {
  var features;
  if (this.featuresCollection_) {
    features = this.featuresCollection_.getArray();
  } else if (this.featuresRtree_) {
    features = this.featuresRtree_.getAll();
    if (!ol.obj.isEmpty(this.nullGeometryFeatures_)) {
      ol.array.extend(
          features, ol.obj.getValues(this.nullGeometryFeatures_));
    }
  }
  return /** @type {Array.<ol.Feature>} */ (features);
};


/**
 * Get all features whose geometry intersects the provided coordinate.
 * @param {ol.Coordinate} coordinate Coordinate.
 * @return {Array.<ol.Feature>} Features.
 * @api stable
 */
ol.source.Vector.prototype.getFeaturesAtCoordinate = function(coordinate) {
  var features = [];
  this.forEachFeatureAtCoordinateDirect(coordinate, function(feature) {
    features.push(feature);
  });
  return features;
};


/**
 * Get all features in the provided extent.  Note that this returns all features
 * whose bounding boxes intersect the given extent (so it may include features
 * whose geometries do not intersect the extent).
 *
 * This method is not available when the source is configured with
 * `useSpatialIndex` set to `false`.
 * @param {ol.Extent} extent Extent.
 * @return {Array.<ol.Feature>} Features.
 * @api
 */
ol.source.Vector.prototype.getFeaturesInExtent = function(extent) {
  goog.DEBUG && console.assert(this.featuresRtree_,
      'getFeaturesInExtent does not work when useSpatialIndex is set to false');
  return this.featuresRtree_.getInExtent(extent);
};


/**
 * Get the closest feature to the provided coordinate.
 *
 * This method is not available when the source is configured with
 * `useSpatialIndex` set to `false`.
 * @param {ol.Coordinate} coordinate Coordinate.
 * @param {function(ol.Feature):boolean=} opt_filter Feature filter function.
 *     The filter function will receive one argument, the {@link ol.Feature feature}
 *     and it should return a boolean value. By default, no filtering is made.
 * @return {ol.Feature} Closest feature.
 * @api stable
 */
ol.source.Vector.prototype.getClosestFeatureToCoordinate = function(coordinate, opt_filter) {
  // Find the closest feature using branch and bound.  We start searching an
  // infinite extent, and find the distance from the first feature found.  This
  // becomes the closest feature.  We then compute a smaller extent which any
  // closer feature must intersect.  We continue searching with this smaller
  // extent, trying to find a closer feature.  Every time we find a closer
  // feature, we update the extent being searched so that any even closer
  // feature must intersect it.  We continue until we run out of features.
  var x = coordinate[0];
  var y = coordinate[1];
  var closestFeature = null;
  var closestPoint = [NaN, NaN];
  var minSquaredDistance = Infinity;
  var extent = [-Infinity, -Infinity, Infinity, Infinity];
  goog.DEBUG && console.assert(this.featuresRtree_,
      'getClosestFeatureToCoordinate does not work with useSpatialIndex set ' +
      'to false');
  var filter = opt_filter ? opt_filter : ol.functions.TRUE;
  this.featuresRtree_.forEachInExtent(extent,
      /**
       * @param {ol.Feature} feature Feature.
       */
      function(feature) {
        if (filter(feature)) {
          var geometry = feature.getGeometry();
          goog.DEBUG && console.assert(geometry,
              'feature geometry is defined and not null');
          var previousMinSquaredDistance = minSquaredDistance;
          minSquaredDistance = geometry.closestPointXY(
              x, y, closestPoint, minSquaredDistance);
          if (minSquaredDistance < previousMinSquaredDistance) {
            closestFeature = feature;
            // This is sneaky.  Reduce the extent that it is currently being
            // searched while the R-Tree traversal using this same extent object
            // is still in progress.  This is safe because the new extent is
            // strictly contained by the old extent.
            var minDistance = Math.sqrt(minSquaredDistance);
            extent[0] = x - minDistance;
            extent[1] = y - minDistance;
            extent[2] = x + minDistance;
            extent[3] = y + minDistance;
          }
        }
      });
  return closestFeature;
};


/**
 * Get the extent of the features currently in the source.
 *
 * This method is not available when the source is configured with
 * `useSpatialIndex` set to `false`.
 * @return {!ol.Extent} Extent.
 * @api stable
 */
ol.source.Vector.prototype.getExtent = function() {
  goog.DEBUG && console.assert(this.featuresRtree_,
      'getExtent does not work when useSpatialIndex is set to false');
  return this.featuresRtree_.getExtent();
};


/**
 * Get a feature by its identifier (the value returned by feature.getId()).
 * Note that the index treats string and numeric identifiers as the same.  So
 * `source.getFeatureById(2)` will return a feature with id `'2'` or `2`.
 *
 * @param {string|number} id Feature identifier.
 * @return {ol.Feature} The feature (or `null` if not found).
 * @api stable
 */
ol.source.Vector.prototype.getFeatureById = function(id) {
  var feature = this.idIndex_[id.toString()];
  return feature !== undefined ? feature : null;
};


/**
 * Get the format associated with this source.
 *
 * @return {ol.format.Feature|undefined} The feature format.
 * @api
 */
ol.source.Vector.prototype.getFormat = function() {
  return this.format_;
};


/**
 * @return {boolean} The source can have overlapping geometries.
 */
ol.source.Vector.prototype.getOverlaps = function() {
  return this.overlaps_;
};


/**
 * Get the url associated with this source.
 *
 * @return {string|ol.FeatureUrlFunction|undefined} The url.
 * @api
 */
ol.source.Vector.prototype.getUrl = function() {
  return this.url_;
};


/**
 * @param {ol.events.Event} event Event.
 * @private
 */
ol.source.Vector.prototype.handleFeatureChange_ = function(event) {
  var feature = /** @type {ol.Feature} */ (event.target);
  var featureKey = ol.getUid(feature).toString();
  var geometry = feature.getGeometry();
  if (!geometry) {
    if (!(featureKey in this.nullGeometryFeatures_)) {
      if (this.featuresRtree_) {
        this.featuresRtree_.remove(feature);
      }
      this.nullGeometryFeatures_[featureKey] = feature;
    }
  } else {
    var extent = geometry.getExtent();
    if (featureKey in this.nullGeometryFeatures_) {
      delete this.nullGeometryFeatures_[featureKey];
      if (this.featuresRtree_) {
        this.featuresRtree_.insert(extent, feature);
      }
    } else {
      if (this.featuresRtree_) {
        this.featuresRtree_.update(extent, feature);
      }
    }
  }
  var id = feature.getId();
  var removed;
  if (id !== undefined) {
    var sid = id.toString();
    if (featureKey in this.undefIdIndex_) {
      delete this.undefIdIndex_[featureKey];
      this.idIndex_[sid] = feature;
    } else {
      if (this.idIndex_[sid] !== feature) {
        removed = this.removeFromIdIndex_(feature);
        goog.DEBUG && console.assert(removed,
            'Expected feature to be removed from index');
        this.idIndex_[sid] = feature;
      }
    }
  } else {
    if (!(featureKey in this.undefIdIndex_)) {
      removed = this.removeFromIdIndex_(feature);
      goog.DEBUG && console.assert(removed,
          'Expected feature to be removed from index');
      this.undefIdIndex_[featureKey] = feature;
    } else {
      goog.DEBUG && console.assert(this.undefIdIndex_[featureKey] === feature,
          'feature keyed under %s in undefIdKeys', featureKey);
    }
  }
  this.changed();
  this.dispatchEvent(new ol.source.VectorEvent(
      ol.source.VectorEventType.CHANGEFEATURE, feature));
};


/**
 * @return {boolean} Is empty.
 */
ol.source.Vector.prototype.isEmpty = function() {
  return this.featuresRtree_.isEmpty() &&
      ol.obj.isEmpty(this.nullGeometryFeatures_);
};


/**
 * @param {ol.Extent} extent Extent.
 * @param {number} resolution Resolution.
 * @param {ol.proj.Projection} projection Projection.
 */
ol.source.Vector.prototype.loadFeatures = function(
    extent, resolution, projection) {
  var loadedExtentsRtree = this.loadedExtentsRtree_;
  var extentsToLoad = this.strategy_(extent, resolution);
  var i, ii;
  for (i = 0, ii = extentsToLoad.length; i < ii; ++i) {
    var extentToLoad = extentsToLoad[i];
    var alreadyLoaded = loadedExtentsRtree.forEachInExtent(extentToLoad,
        /**
         * @param {{extent: ol.Extent}} object Object.
         * @return {boolean} Contains.
         */
        function(object) {
          return ol.extent.containsExtent(object.extent, extentToLoad);
        });
    if (!alreadyLoaded) {
      this.loader_.call(this, extentToLoad, resolution, projection);
      loadedExtentsRtree.insert(extentToLoad, {extent: extentToLoad.slice()});
    }
  }
};


/**
 * Remove a single feature from the source.  If you want to remove all features
 * at once, use the {@link ol.source.Vector#clear source.clear()} method
 * instead.
 * @param {ol.Feature} feature Feature to remove.
 * @api stable
 */
ol.source.Vector.prototype.removeFeature = function(feature) {
  var featureKey = ol.getUid(feature).toString();
  if (featureKey in this.nullGeometryFeatures_) {
    delete this.nullGeometryFeatures_[featureKey];
  } else {
    if (this.featuresRtree_) {
      this.featuresRtree_.remove(feature);
    }
  }
  this.removeFeatureInternal(feature);
  this.changed();
};


/**
 * Remove feature without firing a `change` event.
 * @param {ol.Feature} feature Feature.
 * @protected
 */
ol.source.Vector.prototype.removeFeatureInternal = function(feature) {
  var featureKey = ol.getUid(feature).toString();
  goog.DEBUG && console.assert(featureKey in this.featureChangeKeys_,
      'featureKey exists in featureChangeKeys');
  this.featureChangeKeys_[featureKey].forEach(ol.events.unlistenByKey);
  delete this.featureChangeKeys_[featureKey];
  var id = feature.getId();
  if (id !== undefined) {
    delete this.idIndex_[id.toString()];
  } else {
    delete this.undefIdIndex_[featureKey];
  }
  this.dispatchEvent(new ol.source.VectorEvent(
      ol.source.VectorEventType.REMOVEFEATURE, feature));
};


/**
 * Remove a feature from the id index.  Called internally when the feature id
 * may have changed.
 * @param {ol.Feature} feature The feature.
 * @return {boolean} Removed the feature from the index.
 * @private
 */
ol.source.Vector.prototype.removeFromIdIndex_ = function(feature) {
  var removed = false;
  for (var id in this.idIndex_) {
    if (this.idIndex_[id] === feature) {
      delete this.idIndex_[id];
      removed = true;
      break;
    }
  }
  return removed;
};


/**
 * @classdesc
 * Events emitted by {@link ol.source.Vector} instances are instances of this
 * type.
 *
 * @constructor
 * @extends {ol.events.Event}
 * @implements {oli.source.VectorEvent}
 * @param {string} type Type.
 * @param {ol.Feature=} opt_feature Feature.
 */
ol.source.VectorEvent = function(type, opt_feature) {

  ol.events.Event.call(this, type);

  /**
   * The feature being added or removed.
   * @type {ol.Feature|undefined}
   * @api stable
   */
  this.feature = opt_feature;

};
ol.inherits(ol.source.VectorEvent, ol.events.Event);

goog.provide('ol.interaction.Draw');
goog.provide('ol.interaction.DrawEvent');
goog.provide('ol.interaction.DrawEventType');
goog.provide('ol.interaction.DrawMode');

goog.require('ol');
goog.require('ol.events');
goog.require('ol.events.Event');
goog.require('ol.Feature');
goog.require('ol.MapBrowserEvent.EventType');
goog.require('ol.Object');
goog.require('ol.coordinate');
goog.require('ol.functions');
goog.require('ol.events.condition');
goog.require('ol.geom.Circle');
goog.require('ol.geom.GeometryType');
goog.require('ol.geom.LineString');
goog.require('ol.geom.MultiLineString');
goog.require('ol.geom.MultiPoint');
goog.require('ol.geom.MultiPolygon');
goog.require('ol.geom.Point');
goog.require('ol.geom.Polygon');
goog.require('ol.interaction.InteractionProperty');
goog.require('ol.interaction.Pointer');
goog.require('ol.layer.Vector');
goog.require('ol.source.Vector');
goog.require('ol.style.Style');


/**
 * @enum {string}
 */
ol.interaction.DrawEventType = {
  /**
   * Triggered upon feature draw start
   * @event ol.interaction.DrawEvent#drawstart
   * @api stable
   */
  DRAWSTART: 'drawstart',
  /**
   * Triggered upon feature draw end
   * @event ol.interaction.DrawEvent#drawend
   * @api stable
   */
  DRAWEND: 'drawend'
};


/**
 * @classdesc
 * Events emitted by {@link ol.interaction.Draw} instances are instances of
 * this type.
 *
 * @constructor
 * @extends {ol.events.Event}
 * @implements {oli.DrawEvent}
 * @param {ol.interaction.DrawEventType} type Type.
 * @param {ol.Feature} feature The feature drawn.
 */
ol.interaction.DrawEvent = function(type, feature) {

  ol.events.Event.call(this, type);

  /**
   * The feature being drawn.
   * @type {ol.Feature}
   * @api stable
   */
  this.feature = feature;

};
ol.inherits(ol.interaction.DrawEvent, ol.events.Event);


/**
 * @classdesc
 * Interaction for drawing feature geometries.
 *
 * @constructor
 * @extends {ol.interaction.Pointer}
 * @fires ol.interaction.DrawEvent
 * @param {olx.interaction.DrawOptions} options Options.
 * @api stable
 */
ol.interaction.Draw = function(options) {

  ol.interaction.Pointer.call(this, {
    handleDownEvent: ol.interaction.Draw.handleDownEvent_,
    handleEvent: ol.interaction.Draw.handleEvent,
    handleUpEvent: ol.interaction.Draw.handleUpEvent_
  });

  /**
   * @type {ol.Pixel}
   * @private
   */
  this.downPx_ = null;

  /**
   * @type {boolean}
   * @private
   */
  this.freehand_ = false;

  /**
   * Target source for drawn features.
   * @type {ol.source.Vector}
   * @private
   */
  this.source_ = options.source ? options.source : null;

  /**
   * Target collection for drawn features.
   * @type {ol.Collection.<ol.Feature>}
   * @private
   */
  this.features_ = options.features ? options.features : null;

  /**
   * Pixel distance for snapping.
   * @type {number}
   * @private
   */
  this.snapTolerance_ = options.snapTolerance ? options.snapTolerance : 12;

  /**
   * Geometry type.
   * @type {ol.geom.GeometryType}
   * @private
   */
  this.type_ = options.type;

  /**
   * Drawing mode (derived from geometry type.
   * @type {ol.interaction.DrawMode}
   * @private
   */
  this.mode_ = ol.interaction.Draw.getMode_(this.type_);

  /**
   * The number of points that must be drawn before a polygon ring or line
   * string can be finished.  The default is 3 for polygon rings and 2 for
   * line strings.
   * @type {number}
   * @private
   */
  this.minPoints_ = options.minPoints ?
      options.minPoints :
      (this.mode_ === ol.interaction.DrawMode.POLYGON ? 3 : 2);

  /**
   * The number of points that can be drawn before a polygon ring or line string
   * is finished. The default is no restriction.
   * @type {number}
   * @private
   */
  this.maxPoints_ = options.maxPoints ? options.maxPoints : Infinity;

  /**
   * A function to decide if a potential finish coordinate is permissable
   * @private
   * @type {ol.EventsConditionType}
   */
  this.finishCondition_ = options.finishCondition ? options.finishCondition : ol.functions.TRUE;

  var geometryFunction = options.geometryFunction;
  if (!geometryFunction) {
    if (this.type_ === ol.geom.GeometryType.CIRCLE) {
      /**
       * @param {ol.Coordinate|Array.<ol.Coordinate>|Array.<Array.<ol.Coordinate>>} coordinates
       *     The coordinates.
       * @param {ol.geom.SimpleGeometry=} opt_geometry Optional geometry.
       * @return {ol.geom.SimpleGeometry} A geometry.
       */
      geometryFunction = function(coordinates, opt_geometry) {
        var circle = opt_geometry ? /** @type {ol.geom.Circle} */ (opt_geometry) :
            new ol.geom.Circle([NaN, NaN]);
        var squaredLength = ol.coordinate.squaredDistance(
            coordinates[0], coordinates[1]);
        circle.setCenterAndRadius(coordinates[0], Math.sqrt(squaredLength));
        return circle;
      };
    } else {
      var Constructor;
      var mode = this.mode_;
      if (mode === ol.interaction.DrawMode.POINT) {
        Constructor = ol.geom.Point;
      } else if (mode === ol.interaction.DrawMode.LINE_STRING) {
        Constructor = ol.geom.LineString;
      } else if (mode === ol.interaction.DrawMode.POLYGON) {
        Constructor = ol.geom.Polygon;
      }
      /**
       * @param {ol.Coordinate|Array.<ol.Coordinate>|Array.<Array.<ol.Coordinate>>} coordinates
       *     The coordinates.
       * @param {ol.geom.SimpleGeometry=} opt_geometry Optional geometry.
       * @return {ol.geom.SimpleGeometry} A geometry.
       */
      geometryFunction = function(coordinates, opt_geometry) {
        var geometry = opt_geometry;
        if (geometry) {
          geometry.setCoordinates(coordinates);
        } else {
          geometry = new Constructor(coordinates);
        }
        return geometry;
      };
    }
  }

  /**
   * @type {ol.DrawGeometryFunctionType}
   * @private
   */
  this.geometryFunction_ = geometryFunction;

  /**
   * Finish coordinate for the feature (first point for polygons, last point for
   * linestrings).
   * @type {ol.Coordinate}
   * @private
   */
  this.finishCoordinate_ = null;

  /**
   * Sketch feature.
   * @type {ol.Feature}
   * @private
   */
  this.sketchFeature_ = null;

  /**
   * Sketch point.
   * @type {ol.Feature}
   * @private
   */
  this.sketchPoint_ = null;

  /**
   * Sketch coordinates. Used when drawing a line or polygon.
   * @type {ol.Coordinate|Array.<ol.Coordinate>|Array.<Array.<ol.Coordinate>>}
   * @private
   */
  this.sketchCoords_ = null;

  /**
   * Sketch line. Used when drawing polygon.
   * @type {ol.Feature}
   * @private
   */
  this.sketchLine_ = null;

  /**
   * Sketch line coordinates. Used when drawing a polygon or circle.
   * @type {Array.<ol.Coordinate>}
   * @private
   */
  this.sketchLineCoords_ = null;

  /**
   * Squared tolerance for handling up events.  If the squared distance
   * between a down and up event is greater than this tolerance, up events
   * will not be handled.
   * @type {number}
   * @private
   */
  this.squaredClickTolerance_ = options.clickTolerance ?
      options.clickTolerance * options.clickTolerance : 36;

  /**
   * Draw overlay where our sketch features are drawn.
   * @type {ol.layer.Vector}
   * @private
   */
  this.overlay_ = new ol.layer.Vector({
    source: new ol.source.Vector({
      useSpatialIndex: false,
      wrapX: options.wrapX ? options.wrapX : false
    }),
    style: options.style ? options.style :
        ol.interaction.Draw.getDefaultStyleFunction()
  });

  /**
   * Name of the geometry attribute for newly created features.
   * @type {string|undefined}
   * @private
   */
  this.geometryName_ = options.geometryName;

  /**
   * @private
   * @type {ol.EventsConditionType}
   */
  this.condition_ = options.condition ?
      options.condition : ol.events.condition.noModifierKeys;

  /**
   * @private
   * @type {ol.EventsConditionType}
   */
  this.freehandCondition_ = options.freehandCondition ?
      options.freehandCondition : ol.events.condition.shiftKeyOnly;

  ol.events.listen(this,
      ol.Object.getChangeEventType(ol.interaction.InteractionProperty.ACTIVE),
      this.updateState_, this);

};
ol.inherits(ol.interaction.Draw, ol.interaction.Pointer);


/**
 * @return {ol.StyleFunction} Styles.
 */
ol.interaction.Draw.getDefaultStyleFunction = function() {
  var styles = ol.style.Style.createDefaultEditing();
  return function(feature, resolution) {
    return styles[feature.getGeometry().getType()];
  };
};


/**
 * @inheritDoc
 */
ol.interaction.Draw.prototype.setMap = function(map) {
  ol.interaction.Pointer.prototype.setMap.call(this, map);
  this.updateState_();
};


/**
 * Handles the {@link ol.MapBrowserEvent map browser event} and may actually
 * draw or finish the drawing.
 * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
 * @return {boolean} `false` to stop event propagation.
 * @this {ol.interaction.Draw}
 * @api
 */
ol.interaction.Draw.handleEvent = function(mapBrowserEvent) {
  if ((this.mode_ === ol.interaction.DrawMode.LINE_STRING ||
    this.mode_ === ol.interaction.DrawMode.POLYGON) &&
    this.freehandCondition_(mapBrowserEvent)) {
    this.freehand_ = true;
  }
  var pass = !this.freehand_;
  if (this.freehand_ &&
      mapBrowserEvent.type === ol.MapBrowserEvent.EventType.POINTERDRAG) {
    this.addToDrawing_(mapBrowserEvent);
    pass = false;
  } else if (mapBrowserEvent.type ===
      ol.MapBrowserEvent.EventType.POINTERMOVE) {
    pass = this.handlePointerMove_(mapBrowserEvent);
  } else if (mapBrowserEvent.type === ol.MapBrowserEvent.EventType.DBLCLICK) {
    pass = false;
  }
  return ol.interaction.Pointer.handleEvent.call(this, mapBrowserEvent) && pass;
};


/**
 * @param {ol.MapBrowserPointerEvent} event Event.
 * @return {boolean} Start drag sequence?
 * @this {ol.interaction.Draw}
 * @private
 */
ol.interaction.Draw.handleDownEvent_ = function(event) {
  if (this.condition_(event)) {
    this.downPx_ = event.pixel;
    return true;
  } else if (this.freehand_) {
    this.downPx_ = event.pixel;
    if (!this.finishCoordinate_) {
      this.startDrawing_(event);
    }
    return true;
  } else {
    return false;
  }
};


/**
 * @param {ol.MapBrowserPointerEvent} event Event.
 * @return {boolean} Stop drag sequence?
 * @this {ol.interaction.Draw}
 * @private
 */
ol.interaction.Draw.handleUpEvent_ = function(event) {
  this.freehand_ = false;
  var downPx = this.downPx_;
  var clickPx = event.pixel;
  var dx = downPx[0] - clickPx[0];
  var dy = downPx[1] - clickPx[1];
  var squaredDistance = dx * dx + dy * dy;
  var pass = true;
  if (squaredDistance <= this.squaredClickTolerance_) {
    this.handlePointerMove_(event);
    if (!this.finishCoordinate_) {
      this.startDrawing_(event);
      if (this.mode_ === ol.interaction.DrawMode.POINT) {
        this.finishDrawing();
      }
    } else if (this.mode_ === ol.interaction.DrawMode.CIRCLE) {
      this.finishDrawing();
    } else if (this.atFinish_(event)) {
      if (this.finishCondition_(event)) {
        this.finishDrawing();
      }
    } else {
      this.addToDrawing_(event);
    }
    pass = false;
  }
  return pass;
};


/**
 * Handle move events.
 * @param {ol.MapBrowserEvent} event A move event.
 * @return {boolean} Pass the event to other interactions.
 * @private
 */
ol.interaction.Draw.prototype.handlePointerMove_ = function(event) {
  if (this.finishCoordinate_) {
    this.modifyDrawing_(event);
  } else {
    this.createOrUpdateSketchPoint_(event);
  }
  return true;
};


/**
 * Determine if an event is within the snapping tolerance of the start coord.
 * @param {ol.MapBrowserEvent} event Event.
 * @return {boolean} The event is within the snapping tolerance of the start.
 * @private
 */
ol.interaction.Draw.prototype.atFinish_ = function(event) {
  var at = false;
  if (this.sketchFeature_) {
    var potentiallyDone = false;
    var potentiallyFinishCoordinates = [this.finishCoordinate_];
    if (this.mode_ === ol.interaction.DrawMode.LINE_STRING) {
      potentiallyDone = this.sketchCoords_.length > this.minPoints_;
    } else if (this.mode_ === ol.interaction.DrawMode.POLYGON) {
      potentiallyDone = this.sketchCoords_[0].length >
          this.minPoints_;
      potentiallyFinishCoordinates = [this.sketchCoords_[0][0],
        this.sketchCoords_[0][this.sketchCoords_[0].length - 2]];
    }
    if (potentiallyDone) {
      var map = event.map;
      for (var i = 0, ii = potentiallyFinishCoordinates.length; i < ii; i++) {
        var finishCoordinate = potentiallyFinishCoordinates[i];
        var finishPixel = map.getPixelFromCoordinate(finishCoordinate);
        var pixel = event.pixel;
        var dx = pixel[0] - finishPixel[0];
        var dy = pixel[1] - finishPixel[1];
        var freehand = this.freehand_ && this.freehandCondition_(event);
        var snapTolerance = freehand ? 1 : this.snapTolerance_;
        at = Math.sqrt(dx * dx + dy * dy) <= snapTolerance;
        if (at) {
          this.finishCoordinate_ = finishCoordinate;
          break;
        }
      }
    }
  }
  return at;
};


/**
 * @param {ol.MapBrowserEvent} event Event.
 * @private
 */
ol.interaction.Draw.prototype.createOrUpdateSketchPoint_ = function(event) {
  var coordinates = event.coordinate.slice();
  if (!this.sketchPoint_) {
    this.sketchPoint_ = new ol.Feature(new ol.geom.Point(coordinates));
    this.updateSketchFeatures_();
  } else {
    var sketchPointGeom = /** @type {ol.geom.Point} */ (this.sketchPoint_.getGeometry());
    sketchPointGeom.setCoordinates(coordinates);
  }
};


/**
 * Start the drawing.
 * @param {ol.MapBrowserEvent} event Event.
 * @private
 */
ol.interaction.Draw.prototype.startDrawing_ = function(event) {
  var start = event.coordinate;
  this.finishCoordinate_ = start;
  if (this.mode_ === ol.interaction.DrawMode.POINT) {
    this.sketchCoords_ = start.slice();
  } else if (this.mode_ === ol.interaction.DrawMode.POLYGON) {
    this.sketchCoords_ = [[start.slice(), start.slice()]];
    this.sketchLineCoords_ = this.sketchCoords_[0];
  } else {
    this.sketchCoords_ = [start.slice(), start.slice()];
    if (this.mode_ === ol.interaction.DrawMode.CIRCLE) {
      this.sketchLineCoords_ = this.sketchCoords_;
    }
  }
  if (this.sketchLineCoords_) {
    this.sketchLine_ = new ol.Feature(
        new ol.geom.LineString(this.sketchLineCoords_));
  }
  var geometry = this.geometryFunction_(this.sketchCoords_);
  goog.DEBUG && console.assert(geometry !== undefined, 'geometry should be defined');
  this.sketchFeature_ = new ol.Feature();
  if (this.geometryName_) {
    this.sketchFeature_.setGeometryName(this.geometryName_);
  }
  this.sketchFeature_.setGeometry(geometry);
  this.updateSketchFeatures_();
  this.dispatchEvent(new ol.interaction.DrawEvent(
      ol.interaction.DrawEventType.DRAWSTART, this.sketchFeature_));
};


/**
 * Modify the drawing.
 * @param {ol.MapBrowserEvent} event Event.
 * @private
 */
ol.interaction.Draw.prototype.modifyDrawing_ = function(event) {
  var coordinate = event.coordinate;
  var geometry = /** @type {ol.geom.SimpleGeometry} */ (this.sketchFeature_.getGeometry());
  var coordinates, last;
  if (this.mode_ === ol.interaction.DrawMode.POINT) {
    last = this.sketchCoords_;
  } else if (this.mode_ === ol.interaction.DrawMode.POLYGON) {
    coordinates = this.sketchCoords_[0];
    last = coordinates[coordinates.length - 1];
    if (this.atFinish_(event)) {
      // snap to finish
      coordinate = this.finishCoordinate_.slice();
    }
  } else {
    coordinates = this.sketchCoords_;
    last = coordinates[coordinates.length - 1];
  }
  last[0] = coordinate[0];
  last[1] = coordinate[1];
  goog.DEBUG && console.assert(this.sketchCoords_, 'sketchCoords_ expected');
  this.geometryFunction_(
      /** @type {!ol.Coordinate|!Array.<ol.Coordinate>|!Array.<Array.<ol.Coordinate>>} */ (this.sketchCoords_),
      geometry);
  if (this.sketchPoint_) {
    var sketchPointGeom = /** @type {ol.geom.Point} */ (this.sketchPoint_.getGeometry());
    sketchPointGeom.setCoordinates(coordinate);
  }
  var sketchLineGeom;
  if (geometry instanceof ol.geom.Polygon &&
      this.mode_ !== ol.interaction.DrawMode.POLYGON) {
    if (!this.sketchLine_) {
      this.sketchLine_ = new ol.Feature(new ol.geom.LineString(null));
    }
    var ring = geometry.getLinearRing(0);
    sketchLineGeom = /** @type {ol.geom.LineString} */ (this.sketchLine_.getGeometry());
    sketchLineGeom.setFlatCoordinates(
        ring.getLayout(), ring.getFlatCoordinates());
  } else if (this.sketchLineCoords_) {
    sketchLineGeom = /** @type {ol.geom.LineString} */ (this.sketchLine_.getGeometry());
    sketchLineGeom.setCoordinates(this.sketchLineCoords_);
  }
  this.updateSketchFeatures_();
};


/**
 * Add a new coordinate to the drawing.
 * @param {ol.MapBrowserEvent} event Event.
 * @private
 */
ol.interaction.Draw.prototype.addToDrawing_ = function(event) {
  var coordinate = event.coordinate;
  var geometry = /** @type {ol.geom.SimpleGeometry} */ (this.sketchFeature_.getGeometry());
  var done;
  var coordinates;
  if (this.mode_ === ol.interaction.DrawMode.LINE_STRING) {
    this.finishCoordinate_ = coordinate.slice();
    coordinates = this.sketchCoords_;
    coordinates.push(coordinate.slice());
    done = coordinates.length > this.maxPoints_;
    this.geometryFunction_(coordinates, geometry);
  } else if (this.mode_ === ol.interaction.DrawMode.POLYGON) {
    coordinates = this.sketchCoords_[0];
    coordinates.push(coordinate.slice());
    done = coordinates.length > this.maxPoints_;
    if (done) {
      this.finishCoordinate_ = coordinates[0];
    }
    this.geometryFunction_(this.sketchCoords_, geometry);
  }
  this.updateSketchFeatures_();
  if (done) {
    this.finishDrawing();
  }
};


/**
 * Remove last point of the feature currently being drawn.
 * @api
 */
ol.interaction.Draw.prototype.removeLastPoint = function() {
  var geometry = /** @type {ol.geom.SimpleGeometry} */ (this.sketchFeature_.getGeometry());
  var coordinates, sketchLineGeom;
  if (this.mode_ === ol.interaction.DrawMode.LINE_STRING) {
    coordinates = this.sketchCoords_;
    coordinates.splice(-2, 1);
    this.geometryFunction_(coordinates, geometry);
  } else if (this.mode_ === ol.interaction.DrawMode.POLYGON) {
    coordinates = this.sketchCoords_[0];
    coordinates.splice(-2, 1);
    sketchLineGeom = /** @type {ol.geom.LineString} */ (this.sketchLine_.getGeometry());
    sketchLineGeom.setCoordinates(coordinates);
    this.geometryFunction_(this.sketchCoords_, geometry);
  }

  if (coordinates.length === 0) {
    this.finishCoordinate_ = null;
  }

  this.updateSketchFeatures_();
};


/**
 * Stop drawing and add the sketch feature to the target layer.
 * The {@link ol.interaction.DrawEventType.DRAWEND} event is dispatched before
 * inserting the feature.
 * @api
 */
ol.interaction.Draw.prototype.finishDrawing = function() {
  var sketchFeature = this.abortDrawing_();
  var coordinates = this.sketchCoords_;
  var geometry = /** @type {ol.geom.SimpleGeometry} */ (sketchFeature.getGeometry());
  if (this.mode_ === ol.interaction.DrawMode.LINE_STRING) {
    // remove the redundant last point
    coordinates.pop();
    this.geometryFunction_(coordinates, geometry);
  } else if (this.mode_ === ol.interaction.DrawMode.POLYGON) {
    // When we finish drawing a polygon on the last point,
    // the last coordinate is duplicated as for LineString
    // we force the replacement by the first point
    coordinates[0].pop();
    coordinates[0].push(coordinates[0][0]);
    this.geometryFunction_(coordinates, geometry);
  }

  // cast multi-part geometries
  if (this.type_ === ol.geom.GeometryType.MULTI_POINT) {
    sketchFeature.setGeometry(new ol.geom.MultiPoint([coordinates]));
  } else if (this.type_ === ol.geom.GeometryType.MULTI_LINE_STRING) {
    sketchFeature.setGeometry(new ol.geom.MultiLineString([coordinates]));
  } else if (this.type_ === ol.geom.GeometryType.MULTI_POLYGON) {
    sketchFeature.setGeometry(new ol.geom.MultiPolygon([coordinates]));
  }

  // First dispatch event to allow full set up of feature
  this.dispatchEvent(new ol.interaction.DrawEvent(
      ol.interaction.DrawEventType.DRAWEND, sketchFeature));

  // Then insert feature
  if (this.features_) {
    this.features_.push(sketchFeature);
  }
  if (this.source_) {
    this.source_.addFeature(sketchFeature);
  }
};


/**
 * Stop drawing without adding the sketch feature to the target layer.
 * @return {ol.Feature} The sketch feature (or null if none).
 * @private
 */
ol.interaction.Draw.prototype.abortDrawing_ = function() {
  this.finishCoordinate_ = null;
  var sketchFeature = this.sketchFeature_;
  if (sketchFeature) {
    this.sketchFeature_ = null;
    this.sketchPoint_ = null;
    this.sketchLine_ = null;
    this.overlay_.getSource().clear(true);
  }
  return sketchFeature;
};


/**
 * Extend an existing geometry by adding additional points. This only works
 * on features with `LineString` geometries, where the interaction will
 * extend lines by adding points to the end of the coordinates array.
 * @param {!ol.Feature} feature Feature to be extended.
 * @api
 */
ol.interaction.Draw.prototype.extend = function(feature) {
  var geometry = feature.getGeometry();
  goog.DEBUG && console.assert(this.mode_ == ol.interaction.DrawMode.LINE_STRING,
      'interaction mode must be "line"');
  goog.DEBUG && console.assert(geometry.getType() == ol.geom.GeometryType.LINE_STRING,
      'feature geometry must be a line string');
  var lineString = /** @type {ol.geom.LineString} */ (geometry);
  this.sketchFeature_ = feature;
  this.sketchCoords_ = lineString.getCoordinates();
  var last = this.sketchCoords_[this.sketchCoords_.length - 1];
  this.finishCoordinate_ = last.slice();
  this.sketchCoords_.push(last.slice());
  this.updateSketchFeatures_();
  this.dispatchEvent(new ol.interaction.DrawEvent(
      ol.interaction.DrawEventType.DRAWSTART, this.sketchFeature_));
};


/**
 * @inheritDoc
 */
ol.interaction.Draw.prototype.shouldStopEvent = ol.functions.FALSE;


/**
 * Redraw the sketch features.
 * @private
 */
ol.interaction.Draw.prototype.updateSketchFeatures_ = function() {
  var sketchFeatures = [];
  if (this.sketchFeature_) {
    sketchFeatures.push(this.sketchFeature_);
  }
  if (this.sketchLine_) {
    sketchFeatures.push(this.sketchLine_);
  }
  if (this.sketchPoint_) {
    sketchFeatures.push(this.sketchPoint_);
  }
  var overlaySource = this.overlay_.getSource();
  overlaySource.clear(true);
  overlaySource.addFeatures(sketchFeatures);
};


/**
 * @private
 */
ol.interaction.Draw.prototype.updateState_ = function() {
  var map = this.getMap();
  var active = this.getActive();
  if (!map || !active) {
    this.abortDrawing_();
  }
  this.overlay_.setMap(active ? map : null);
};


/**
 * Create a `geometryFunction` for `mode: 'Circle'` that will create a regular
 * polygon with a user specified number of sides and start angle instead of an
 * `ol.geom.Circle` geometry.
 * @param {number=} opt_sides Number of sides of the regular polygon. Default is
 *     32.
 * @param {number=} opt_angle Angle of the first point in radians. 0 means East.
 *     Default is the angle defined by the heading from the center of the
 *     regular polygon to the current pointer position.
 * @return {ol.DrawGeometryFunctionType} Function that draws a
 *     polygon.
 * @api
 */
ol.interaction.Draw.createRegularPolygon = function(opt_sides, opt_angle) {
  return (
      /**
       * @param {ol.Coordinate|Array.<ol.Coordinate>|Array.<Array.<ol.Coordinate>>} coordinates
       * @param {ol.geom.SimpleGeometry=} opt_geometry
       * @return {ol.geom.SimpleGeometry}
       */
      function(coordinates, opt_geometry) {
        var center = coordinates[0];
        var end = coordinates[1];
        var radius = Math.sqrt(
            ol.coordinate.squaredDistance(center, end));
        var geometry = opt_geometry ? /** @type {ol.geom.Polygon} */ (opt_geometry) :
            ol.geom.Polygon.fromCircle(new ol.geom.Circle(center), opt_sides);
        var angle = opt_angle ? opt_angle :
            Math.atan((end[1] - center[1]) / (end[0] - center[0]));
        ol.geom.Polygon.makeRegular(geometry, center, radius, angle);
        return geometry;
      }
  );
};


/**
 * Get the drawing mode.  The mode for mult-part geometries is the same as for
 * their single-part cousins.
 * @param {ol.geom.GeometryType} type Geometry type.
 * @return {ol.interaction.DrawMode} Drawing mode.
 * @private
 */
ol.interaction.Draw.getMode_ = function(type) {
  var mode;
  if (type === ol.geom.GeometryType.POINT ||
      type === ol.geom.GeometryType.MULTI_POINT) {
    mode = ol.interaction.DrawMode.POINT;
  } else if (type === ol.geom.GeometryType.LINE_STRING ||
      type === ol.geom.GeometryType.MULTI_LINE_STRING) {
    mode = ol.interaction.DrawMode.LINE_STRING;
  } else if (type === ol.geom.GeometryType.POLYGON ||
      type === ol.geom.GeometryType.MULTI_POLYGON) {
    mode = ol.interaction.DrawMode.POLYGON;
  } else if (type === ol.geom.GeometryType.CIRCLE) {
    mode = ol.interaction.DrawMode.CIRCLE;
  }
  return /** @type {!ol.interaction.DrawMode} */ (mode);
};


/**
 * Draw mode.  This collapses multi-part geometry types with their single-part
 * cousins.
 * @enum {string}
 */
ol.interaction.DrawMode = {
  POINT: 'Point',
  LINE_STRING: 'LineString',
  POLYGON: 'Polygon',
  CIRCLE: 'Circle'
};

goog.provide('ol.interaction.Modify');
goog.provide('ol.interaction.ModifyEvent');

goog.require('ol');
goog.require('ol.Collection');
goog.require('ol.Feature');
goog.require('ol.MapBrowserEvent.EventType');
goog.require('ol.MapBrowserPointerEvent');
goog.require('ol.View');
goog.require('ol.array');
goog.require('ol.coordinate');
goog.require('ol.events');
goog.require('ol.events.Event');
goog.require('ol.events.EventType');
goog.require('ol.events.condition');
goog.require('ol.extent');
goog.require('ol.geom.GeometryType');
goog.require('ol.geom.Point');
goog.require('ol.interaction.Pointer');
goog.require('ol.layer.Vector');
goog.require('ol.source.Vector');
goog.require('ol.structs.RBush');
goog.require('ol.style.Style');


/**
 * @enum {string}
 */
ol.ModifyEventType = {
  /**
   * Triggered upon feature modification start
   * @event ol.interaction.ModifyEvent#modifystart
   * @api
   */
  MODIFYSTART: 'modifystart',
  /**
   * Triggered upon feature modification end
   * @event ol.interaction.ModifyEvent#modifyend
   * @api
   */
  MODIFYEND: 'modifyend'
};


/**
 * @classdesc
 * Events emitted by {@link ol.interaction.Modify} instances are instances of
 * this type.
 *
 * @constructor
 * @extends {ol.events.Event}
 * @implements {oli.ModifyEvent}
 * @param {ol.ModifyEventType} type Type.
 * @param {ol.Collection.<ol.Feature>} features The features modified.
 * @param {ol.MapBrowserPointerEvent} mapBrowserPointerEvent Associated
 *     {@link ol.MapBrowserPointerEvent}.
 */
ol.interaction.ModifyEvent = function(type, features, mapBrowserPointerEvent) {

  ol.events.Event.call(this, type);

  /**
   * The features being modified.
   * @type {ol.Collection.<ol.Feature>}
   * @api
   */
  this.features = features;

  /**
   * Associated {@link ol.MapBrowserEvent}.
   * @type {ol.MapBrowserEvent}
   * @api
   */
  this.mapBrowserEvent = mapBrowserPointerEvent;
};
ol.inherits(ol.interaction.ModifyEvent, ol.events.Event);


/**
 * @classdesc
 * Interaction for modifying feature geometries.
 *
 * @constructor
 * @extends {ol.interaction.Pointer}
 * @param {olx.interaction.ModifyOptions} options Options.
 * @fires ol.interaction.ModifyEvent
 * @api
 */
ol.interaction.Modify = function(options) {

  ol.interaction.Pointer.call(this, {
    handleDownEvent: ol.interaction.Modify.handleDownEvent_,
    handleDragEvent: ol.interaction.Modify.handleDragEvent_,
    handleEvent: ol.interaction.Modify.handleEvent,
    handleUpEvent: ol.interaction.Modify.handleUpEvent_
  });

  /**
   * @private
   * @type {ol.EventsConditionType}
   */
  this.condition_ = options.condition ?
      options.condition : ol.events.condition.primaryAction;


  /**
   * @private
   * @param {ol.MapBrowserEvent} mapBrowserEvent Browser event.
   * @return {boolean} Combined condition result.
   */
  this.defaultDeleteCondition_ = function(mapBrowserEvent) {
    return ol.events.condition.noModifierKeys(mapBrowserEvent) &&
      ol.events.condition.singleClick(mapBrowserEvent);
  };

  /**
   * @type {ol.EventsConditionType}
   * @private
   */
  this.deleteCondition_ = options.deleteCondition ?
      options.deleteCondition : this.defaultDeleteCondition_;

  /**
   * Editing vertex.
   * @type {ol.Feature}
   * @private
   */
  this.vertexFeature_ = null;

  /**
   * Segments intersecting {@link this.vertexFeature_} by segment uid.
   * @type {Object.<string, boolean>}
   * @private
   */
  this.vertexSegments_ = null;

  /**
   * @type {ol.Pixel}
   * @private
   */
  this.lastPixel_ = [0, 0];

  /**
   * Tracks if the next `singleclick` event should be ignored to prevent
   * accidental deletion right after vertex creation.
   * @type {boolean}
   * @private
   */
  this.ignoreNextSingleClick_ = false;

  /**
   * @type {boolean}
   * @private
   */
  this.modified_ = false;

  /**
   * Segment RTree for each layer
   * @type {ol.structs.RBush.<ol.ModifySegmentDataType>}
   * @private
   */
  this.rBush_ = new ol.structs.RBush();

  /**
   * @type {number}
   * @private
   */
  this.pixelTolerance_ = options.pixelTolerance !== undefined ?
      options.pixelTolerance : 10;

  /**
   * @type {boolean}
   * @private
   */
  this.snappedToVertex_ = false;

  /**
   * Indicate whether the interaction is currently changing a feature's
   * coordinates.
   * @type {boolean}
   * @private
   */
  this.changingFeature_ = false;

  /**
   * @type {Array}
   * @private
   */
  this.dragSegments_ = [];

  /**
   * Draw overlay where sketch features are drawn.
   * @type {ol.layer.Vector}
   * @private
   */
  this.overlay_ = new ol.layer.Vector({
    source: new ol.source.Vector({
      useSpatialIndex: false,
      wrapX: !!options.wrapX
    }),
    style: options.style ? options.style :
        ol.interaction.Modify.getDefaultStyleFunction(),
    updateWhileAnimating: true,
    updateWhileInteracting: true
  });

  /**
  * @const
  * @private
  * @type {Object.<string, function(ol.Feature, ol.geom.Geometry)>}
  */
  this.SEGMENT_WRITERS_ = {
    'Point': this.writePointGeometry_,
    'LineString': this.writeLineStringGeometry_,
    'LinearRing': this.writeLineStringGeometry_,
    'Polygon': this.writePolygonGeometry_,
    'MultiPoint': this.writeMultiPointGeometry_,
    'MultiLineString': this.writeMultiLineStringGeometry_,
    'MultiPolygon': this.writeMultiPolygonGeometry_,
    'GeometryCollection': this.writeGeometryCollectionGeometry_
  };

  /**
   * @type {ol.Collection.<ol.Feature>}
   * @private
   */
  this.features_ = options.features;

  this.features_.forEach(this.addFeature_, this);
  ol.events.listen(this.features_, ol.Collection.EventType.ADD,
      this.handleFeatureAdd_, this);
  ol.events.listen(this.features_, ol.Collection.EventType.REMOVE,
      this.handleFeatureRemove_, this);

  /**
   * @type {ol.MapBrowserPointerEvent}
   * @private
   */
  this.lastPointerEvent_ = null;

};
ol.inherits(ol.interaction.Modify, ol.interaction.Pointer);


/**
 * @param {ol.Feature} feature Feature.
 * @private
 */
ol.interaction.Modify.prototype.addFeature_ = function(feature) {
  var geometry = feature.getGeometry();
  if (geometry && geometry.getType() in this.SEGMENT_WRITERS_) {
    this.SEGMENT_WRITERS_[geometry.getType()].call(this, feature, geometry);
  }
  var map = this.getMap();
  if (map) {
    this.handlePointerAtPixel_(this.lastPixel_, map);
  }
  ol.events.listen(feature, ol.events.EventType.CHANGE,
      this.handleFeatureChange_, this);
};


/**
 * @param {ol.MapBrowserPointerEvent} evt Map browser event
 * @private
 */
ol.interaction.Modify.prototype.willModifyFeatures_ = function(evt) {
  if (!this.modified_) {
    this.modified_ = true;
    this.dispatchEvent(new ol.interaction.ModifyEvent(
        ol.ModifyEventType.MODIFYSTART, this.features_, evt));
  }
};


/**
 * @param {ol.Feature} feature Feature.
 * @private
 */
ol.interaction.Modify.prototype.removeFeature_ = function(feature) {
  this.removeFeatureSegmentData_(feature);
  // Remove the vertex feature if the collection of canditate features
  // is empty.
  if (this.vertexFeature_ && this.features_.getLength() === 0) {
    this.overlay_.getSource().removeFeature(this.vertexFeature_);
    this.vertexFeature_ = null;
  }
  ol.events.unlisten(feature, ol.events.EventType.CHANGE,
      this.handleFeatureChange_, this);
};


/**
 * @param {ol.Feature} feature Feature.
 * @private
 */
ol.interaction.Modify.prototype.removeFeatureSegmentData_ = function(feature) {
  var rBush = this.rBush_;
  var /** @type {Array.<ol.ModifySegmentDataType>} */ nodesToRemove = [];
  rBush.forEach(
      /**
       * @param {ol.ModifySegmentDataType} node RTree node.
       */
      function(node) {
        if (feature === node.feature) {
          nodesToRemove.push(node);
        }
      });
  for (var i = nodesToRemove.length - 1; i >= 0; --i) {
    rBush.remove(nodesToRemove[i]);
  }
};


/**
 * @inheritDoc
 */
ol.interaction.Modify.prototype.setMap = function(map) {
  this.overlay_.setMap(map);
  ol.interaction.Pointer.prototype.setMap.call(this, map);
};


/**
 * @param {ol.Collection.Event} evt Event.
 * @private
 */
ol.interaction.Modify.prototype.handleFeatureAdd_ = function(evt) {
  this.addFeature_(/** @type {ol.Feature} */ (evt.element));
};


/**
 * @param {ol.events.Event} evt Event.
 * @private
 */
ol.interaction.Modify.prototype.handleFeatureChange_ = function(evt) {
  if (!this.changingFeature_) {
    var feature = /** @type {ol.Feature} */ (evt.target);
    this.removeFeature_(feature);
    this.addFeature_(feature);
  }
};


/**
 * @param {ol.Collection.Event} evt Event.
 * @private
 */
ol.interaction.Modify.prototype.handleFeatureRemove_ = function(evt) {
  var feature = /** @type {ol.Feature} */ (evt.element);
  this.removeFeature_(feature);
};


/**
 * @param {ol.Feature} feature Feature
 * @param {ol.geom.Point} geometry Geometry.
 * @private
 */
ol.interaction.Modify.prototype.writePointGeometry_ = function(feature, geometry) {
  var coordinates = geometry.getCoordinates();
  var segmentData = /** @type {ol.ModifySegmentDataType} */ ({
    feature: feature,
    geometry: geometry,
    segment: [coordinates, coordinates]
  });
  this.rBush_.insert(geometry.getExtent(), segmentData);
};


/**
 * @param {ol.Feature} feature Feature
 * @param {ol.geom.MultiPoint} geometry Geometry.
 * @private
 */
ol.interaction.Modify.prototype.writeMultiPointGeometry_ = function(feature, geometry) {
  var points = geometry.getCoordinates();
  var coordinates, i, ii, segmentData;
  for (i = 0, ii = points.length; i < ii; ++i) {
    coordinates = points[i];
    segmentData = /** @type {ol.ModifySegmentDataType} */ ({
      feature: feature,
      geometry: geometry,
      depth: [i],
      index: i,
      segment: [coordinates, coordinates]
    });
    this.rBush_.insert(geometry.getExtent(), segmentData);
  }
};


/**
 * @param {ol.Feature} feature Feature
 * @param {ol.geom.LineString} geometry Geometry.
 * @private
 */
ol.interaction.Modify.prototype.writeLineStringGeometry_ = function(feature, geometry) {
  var coordinates = geometry.getCoordinates();
  var i, ii, segment, segmentData;
  for (i = 0, ii = coordinates.length - 1; i < ii; ++i) {
    segment = coordinates.slice(i, i + 2);
    segmentData = /** @type {ol.ModifySegmentDataType} */ ({
      feature: feature,
      geometry: geometry,
      index: i,
      segment: segment
    });
    this.rBush_.insert(ol.extent.boundingExtent(segment), segmentData);
  }
};


/**
 * @param {ol.Feature} feature Feature
 * @param {ol.geom.MultiLineString} geometry Geometry.
 * @private
 */
ol.interaction.Modify.prototype.writeMultiLineStringGeometry_ = function(feature, geometry) {
  var lines = geometry.getCoordinates();
  var coordinates, i, ii, j, jj, segment, segmentData;
  for (j = 0, jj = lines.length; j < jj; ++j) {
    coordinates = lines[j];
    for (i = 0, ii = coordinates.length - 1; i < ii; ++i) {
      segment = coordinates.slice(i, i + 2);
      segmentData = /** @type {ol.ModifySegmentDataType} */ ({
        feature: feature,
        geometry: geometry,
        depth: [j],
        index: i,
        segment: segment
      });
      this.rBush_.insert(ol.extent.boundingExtent(segment), segmentData);
    }
  }
};


/**
 * @param {ol.Feature} feature Feature
 * @param {ol.geom.Polygon} geometry Geometry.
 * @private
 */
ol.interaction.Modify.prototype.writePolygonGeometry_ = function(feature, geometry) {
  var rings = geometry.getCoordinates();
  var coordinates, i, ii, j, jj, segment, segmentData;
  for (j = 0, jj = rings.length; j < jj; ++j) {
    coordinates = rings[j];
    for (i = 0, ii = coordinates.length - 1; i < ii; ++i) {
      segment = coordinates.slice(i, i + 2);
      segmentData = /** @type {ol.ModifySegmentDataType} */ ({
        feature: feature,
        geometry: geometry,
        depth: [j],
        index: i,
        segment: segment
      });
      this.rBush_.insert(ol.extent.boundingExtent(segment), segmentData);
    }
  }
};


/**
 * @param {ol.Feature} feature Feature
 * @param {ol.geom.MultiPolygon} geometry Geometry.
 * @private
 */
ol.interaction.Modify.prototype.writeMultiPolygonGeometry_ = function(feature, geometry) {
  var polygons = geometry.getCoordinates();
  var coordinates, i, ii, j, jj, k, kk, rings, segment, segmentData;
  for (k = 0, kk = polygons.length; k < kk; ++k) {
    rings = polygons[k];
    for (j = 0, jj = rings.length; j < jj; ++j) {
      coordinates = rings[j];
      for (i = 0, ii = coordinates.length - 1; i < ii; ++i) {
        segment = coordinates.slice(i, i + 2);
        segmentData = /** @type {ol.ModifySegmentDataType} */ ({
          feature: feature,
          geometry: geometry,
          depth: [j, k],
          index: i,
          segment: segment
        });
        this.rBush_.insert(ol.extent.boundingExtent(segment), segmentData);
      }
    }
  }
};


/**
 * @param {ol.Feature} feature Feature
 * @param {ol.geom.GeometryCollection} geometry Geometry.
 * @private
 */
ol.interaction.Modify.prototype.writeGeometryCollectionGeometry_ = function(feature, geometry) {
  var i, geometries = geometry.getGeometriesArray();
  for (i = 0; i < geometries.length; ++i) {
    this.SEGMENT_WRITERS_[geometries[i].getType()].call(
        this, feature, geometries[i]);
  }
};


/**
 * @param {ol.Coordinate} coordinates Coordinates.
 * @return {ol.Feature} Vertex feature.
 * @private
 */
ol.interaction.Modify.prototype.createOrUpdateVertexFeature_ = function(coordinates) {
  var vertexFeature = this.vertexFeature_;
  if (!vertexFeature) {
    vertexFeature = new ol.Feature(new ol.geom.Point(coordinates));
    this.vertexFeature_ = vertexFeature;
    this.overlay_.getSource().addFeature(vertexFeature);
  } else {
    var geometry = /** @type {ol.geom.Point} */ (vertexFeature.getGeometry());
    geometry.setCoordinates(coordinates);
  }
  return vertexFeature;
};


/**
 * @param {ol.ModifySegmentDataType} a The first segment data.
 * @param {ol.ModifySegmentDataType} b The second segment data.
 * @return {number} The difference in indexes.
 * @private
 */
ol.interaction.Modify.compareIndexes_ = function(a, b) {
  return a.index - b.index;
};


/**
 * @param {ol.MapBrowserPointerEvent} evt Event.
 * @return {boolean} Start drag sequence?
 * @this {ol.interaction.Modify}
 * @private
 */
ol.interaction.Modify.handleDownEvent_ = function(evt) {
  if (!this.condition_(evt)) {
    return false;
  }
  this.handlePointerAtPixel_(evt.pixel, evt.map);
  this.dragSegments_.length = 0;
  this.modified_ = false;
  var vertexFeature = this.vertexFeature_;
  if (vertexFeature) {
    var insertVertices = [];
    var geometry = /** @type {ol.geom.Point} */ (vertexFeature.getGeometry());
    var vertex = geometry.getCoordinates();
    var vertexExtent = ol.extent.boundingExtent([vertex]);
    var segmentDataMatches = this.rBush_.getInExtent(vertexExtent);
    var componentSegments = {};
    segmentDataMatches.sort(ol.interaction.Modify.compareIndexes_);
    for (var i = 0, ii = segmentDataMatches.length; i < ii; ++i) {
      var segmentDataMatch = segmentDataMatches[i];
      var segment = segmentDataMatch.segment;
      var uid = ol.getUid(segmentDataMatch.feature);
      var depth = segmentDataMatch.depth;
      if (depth) {
        uid += '-' + depth.join('-'); // separate feature components
      }
      if (!componentSegments[uid]) {
        componentSegments[uid] = new Array(2);
      }
      if (ol.coordinate.equals(segment[0], vertex) &&
          !componentSegments[uid][0]) {
        this.dragSegments_.push([segmentDataMatch, 0]);
        componentSegments[uid][0] = segmentDataMatch;
      } else if (ol.coordinate.equals(segment[1], vertex) &&
          !componentSegments[uid][1]) {

        // prevent dragging closed linestrings by the connecting node
        if ((segmentDataMatch.geometry.getType() ===
            ol.geom.GeometryType.LINE_STRING ||
            segmentDataMatch.geometry.getType() ===
            ol.geom.GeometryType.MULTI_LINE_STRING) &&
            componentSegments[uid][0] &&
            componentSegments[uid][0].index === 0) {
          continue;
        }

        this.dragSegments_.push([segmentDataMatch, 1]);
        componentSegments[uid][1] = segmentDataMatch;
      } else if (ol.getUid(segment) in this.vertexSegments_ &&
          (!componentSegments[uid][0] && !componentSegments[uid][1])) {
        insertVertices.push([segmentDataMatch, vertex]);
      }
    }
    if (insertVertices.length) {
      this.willModifyFeatures_(evt);
    }
    for (var j = insertVertices.length - 1; j >= 0; --j) {
      this.insertVertex_.apply(this, insertVertices[j]);
    }
  }
  return !!this.vertexFeature_;
};


/**
 * @param {ol.MapBrowserPointerEvent} evt Event.
 * @this {ol.interaction.Modify}
 * @private
 */
ol.interaction.Modify.handleDragEvent_ = function(evt) {
  this.ignoreNextSingleClick_ = false;
  this.willModifyFeatures_(evt);

  var vertex = evt.coordinate;
  for (var i = 0, ii = this.dragSegments_.length; i < ii; ++i) {
    var dragSegment = this.dragSegments_[i];
    var segmentData = dragSegment[0];
    var depth = segmentData.depth;
    var geometry = segmentData.geometry;
    var coordinates = geometry.getCoordinates();
    var segment = segmentData.segment;
    var index = dragSegment[1];

    while (vertex.length < geometry.getStride()) {
      vertex.push(0);
    }

    switch (geometry.getType()) {
      case ol.geom.GeometryType.POINT:
        coordinates = vertex;
        segment[0] = segment[1] = vertex;
        break;
      case ol.geom.GeometryType.MULTI_POINT:
        coordinates[segmentData.index] = vertex;
        segment[0] = segment[1] = vertex;
        break;
      case ol.geom.GeometryType.LINE_STRING:
        coordinates[segmentData.index + index] = vertex;
        segment[index] = vertex;
        break;
      case ol.geom.GeometryType.MULTI_LINE_STRING:
        coordinates[depth[0]][segmentData.index + index] = vertex;
        segment[index] = vertex;
        break;
      case ol.geom.GeometryType.POLYGON:
        coordinates[depth[0]][segmentData.index + index] = vertex;
        segment[index] = vertex;
        break;
      case ol.geom.GeometryType.MULTI_POLYGON:
        coordinates[depth[1]][depth[0]][segmentData.index + index] = vertex;
        segment[index] = vertex;
        break;
      default:
        // pass
    }

    this.setGeometryCoordinates_(geometry, coordinates);
  }
  this.createOrUpdateVertexFeature_(vertex);
};


/**
 * @param {ol.MapBrowserPointerEvent} evt Event.
 * @return {boolean} Stop drag sequence?
 * @this {ol.interaction.Modify}
 * @private
 */
ol.interaction.Modify.handleUpEvent_ = function(evt) {
  var segmentData;
  for (var i = this.dragSegments_.length - 1; i >= 0; --i) {
    segmentData = this.dragSegments_[i][0];
    this.rBush_.update(ol.extent.boundingExtent(segmentData.segment),
        segmentData);
  }
  if (this.modified_) {
    this.dispatchEvent(new ol.interaction.ModifyEvent(
        ol.ModifyEventType.MODIFYEND, this.features_, evt));
    this.modified_ = false;
  }
  return false;
};


/**
 * Handles the {@link ol.MapBrowserEvent map browser event} and may modify the
 * geometry.
 * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
 * @return {boolean} `false` to stop event propagation.
 * @this {ol.interaction.Modify}
 * @api
 */
ol.interaction.Modify.handleEvent = function(mapBrowserEvent) {
  if (!(mapBrowserEvent instanceof ol.MapBrowserPointerEvent)) {
    return true;
  }
  this.lastPointerEvent_ = mapBrowserEvent;

  var handled;
  if (!mapBrowserEvent.map.getView().getHints()[ol.View.Hint.INTERACTING] &&
      mapBrowserEvent.type == ol.MapBrowserEvent.EventType.POINTERMOVE &&
      !this.handlingDownUpSequence) {
    this.handlePointerMove_(mapBrowserEvent);
  }
  if (this.vertexFeature_ && this.deleteCondition_(mapBrowserEvent)) {
    if (mapBrowserEvent.type != ol.MapBrowserEvent.EventType.SINGLECLICK ||
        !this.ignoreNextSingleClick_) {
      handled = this.removePoint();
    } else {
      handled = true;
    }
  }

  if (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.SINGLECLICK) {
    this.ignoreNextSingleClick_ = false;
  }

  return ol.interaction.Pointer.handleEvent.call(this, mapBrowserEvent) &&
      !handled;
};


/**
 * @param {ol.MapBrowserEvent} evt Event.
 * @private
 */
ol.interaction.Modify.prototype.handlePointerMove_ = function(evt) {
  this.lastPixel_ = evt.pixel;
  this.handlePointerAtPixel_(evt.pixel, evt.map);
};


/**
 * @param {ol.Pixel} pixel Pixel
 * @param {ol.Map} map Map.
 * @private
 */
ol.interaction.Modify.prototype.handlePointerAtPixel_ = function(pixel, map) {
  var pixelCoordinate = map.getCoordinateFromPixel(pixel);
  var sortByDistance = function(a, b) {
    return ol.coordinate.squaredDistanceToSegment(pixelCoordinate, a.segment) -
        ol.coordinate.squaredDistanceToSegment(pixelCoordinate, b.segment);
  };

  var lowerLeft = map.getCoordinateFromPixel(
      [pixel[0] - this.pixelTolerance_, pixel[1] + this.pixelTolerance_]);
  var upperRight = map.getCoordinateFromPixel(
      [pixel[0] + this.pixelTolerance_, pixel[1] - this.pixelTolerance_]);
  var box = ol.extent.boundingExtent([lowerLeft, upperRight]);

  var rBush = this.rBush_;
  var nodes = rBush.getInExtent(box);
  if (nodes.length > 0) {
    nodes.sort(sortByDistance);
    var node = nodes[0];
    var closestSegment = node.segment;
    var vertex = (ol.coordinate.closestOnSegment(pixelCoordinate,
        closestSegment));
    var vertexPixel = map.getPixelFromCoordinate(vertex);
    if (Math.sqrt(ol.coordinate.squaredDistance(pixel, vertexPixel)) <=
        this.pixelTolerance_) {
      var pixel1 = map.getPixelFromCoordinate(closestSegment[0]);
      var pixel2 = map.getPixelFromCoordinate(closestSegment[1]);
      var squaredDist1 = ol.coordinate.squaredDistance(vertexPixel, pixel1);
      var squaredDist2 = ol.coordinate.squaredDistance(vertexPixel, pixel2);
      var dist = Math.sqrt(Math.min(squaredDist1, squaredDist2));
      this.snappedToVertex_ = dist <= this.pixelTolerance_;
      if (this.snappedToVertex_) {
        vertex = squaredDist1 > squaredDist2 ?
            closestSegment[1] : closestSegment[0];
      }
      this.createOrUpdateVertexFeature_(vertex);
      var vertexSegments = {};
      vertexSegments[ol.getUid(closestSegment)] = true;
      var segment;
      for (var i = 1, ii = nodes.length; i < ii; ++i) {
        segment = nodes[i].segment;
        if ((ol.coordinate.equals(closestSegment[0], segment[0]) &&
            ol.coordinate.equals(closestSegment[1], segment[1]) ||
            (ol.coordinate.equals(closestSegment[0], segment[1]) &&
            ol.coordinate.equals(closestSegment[1], segment[0])))) {
          vertexSegments[ol.getUid(segment)] = true;
        } else {
          break;
        }
      }
      this.vertexSegments_ = vertexSegments;
      return;
    }
  }
  if (this.vertexFeature_) {
    this.overlay_.getSource().removeFeature(this.vertexFeature_);
    this.vertexFeature_ = null;
  }
};


/**
 * @param {ol.ModifySegmentDataType} segmentData Segment data.
 * @param {ol.Coordinate} vertex Vertex.
 * @private
 */
ol.interaction.Modify.prototype.insertVertex_ = function(segmentData, vertex) {
  var segment = segmentData.segment;
  var feature = segmentData.feature;
  var geometry = segmentData.geometry;
  var depth = segmentData.depth;
  var index = /** @type {number} */ (segmentData.index);
  var coordinates;

  while (vertex.length < geometry.getStride()) {
    vertex.push(0);
  }

  switch (geometry.getType()) {
    case ol.geom.GeometryType.MULTI_LINE_STRING:
      coordinates = geometry.getCoordinates();
      coordinates[depth[0]].splice(index + 1, 0, vertex);
      break;
    case ol.geom.GeometryType.POLYGON:
      coordinates = geometry.getCoordinates();
      coordinates[depth[0]].splice(index + 1, 0, vertex);
      break;
    case ol.geom.GeometryType.MULTI_POLYGON:
      coordinates = geometry.getCoordinates();
      coordinates[depth[1]][depth[0]].splice(index + 1, 0, vertex);
      break;
    case ol.geom.GeometryType.LINE_STRING:
      coordinates = geometry.getCoordinates();
      coordinates.splice(index + 1, 0, vertex);
      break;
    default:
      return;
  }

  this.setGeometryCoordinates_(geometry, coordinates);
  var rTree = this.rBush_;
  rTree.remove(segmentData);
  this.updateSegmentIndices_(geometry, index, depth, 1);
  var newSegmentData = /** @type {ol.ModifySegmentDataType} */ ({
    segment: [segment[0], vertex],
    feature: feature,
    geometry: geometry,
    depth: depth,
    index: index
  });
  rTree.insert(ol.extent.boundingExtent(newSegmentData.segment),
      newSegmentData);
  this.dragSegments_.push([newSegmentData, 1]);

  var newSegmentData2 = /** @type {ol.ModifySegmentDataType} */ ({
    segment: [vertex, segment[1]],
    feature: feature,
    geometry: geometry,
    depth: depth,
    index: index + 1
  });
  rTree.insert(ol.extent.boundingExtent(newSegmentData2.segment),
      newSegmentData2);
  this.dragSegments_.push([newSegmentData2, 0]);
  this.ignoreNextSingleClick_ = true;
};

/**
 * Removes the vertex currently being pointed.
 * @return {boolean} True when a vertex was removed.
 * @api
 */
ol.interaction.Modify.prototype.removePoint = function() {
  var handled = false;
  if (this.lastPointerEvent_ && this.lastPointerEvent_.type != ol.MapBrowserEvent.EventType.POINTERDRAG) {
    var evt = this.lastPointerEvent_;
    this.willModifyFeatures_(evt);
    handled = this.removeVertex_();
    this.dispatchEvent(new ol.interaction.ModifyEvent(
        ol.ModifyEventType.MODIFYEND, this.features_, evt));
    this.modified_ = false;
  }
  return handled;
};

/**
 * Removes a vertex from all matching features.
 * @return {boolean} True when a vertex was removed.
 * @private
 */
ol.interaction.Modify.prototype.removeVertex_ = function() {
  var dragSegments = this.dragSegments_;
  var segmentsByFeature = {};
  var deleted = false;
  var component, coordinates, dragSegment, geometry, i, index, left;
  var newIndex, right, segmentData, uid;
  for (i = dragSegments.length - 1; i >= 0; --i) {
    dragSegment = dragSegments[i];
    segmentData = dragSegment[0];
    uid = ol.getUid(segmentData.feature);
    if (segmentData.depth) {
      // separate feature components
      uid += '-' + segmentData.depth.join('-');
    }
    if (!(uid in segmentsByFeature)) {
      segmentsByFeature[uid] = {};
    }
    if (dragSegment[1] === 0) {
      segmentsByFeature[uid].right = segmentData;
      segmentsByFeature[uid].index = segmentData.index;
    } else if (dragSegment[1] == 1) {
      segmentsByFeature[uid].left = segmentData;
      segmentsByFeature[uid].index = segmentData.index + 1;
    }

  }
  for (uid in segmentsByFeature) {
    right = segmentsByFeature[uid].right;
    left = segmentsByFeature[uid].left;
    index = segmentsByFeature[uid].index;
    newIndex = index - 1;
    if (left !== undefined) {
      segmentData = left;
    } else {
      segmentData = right;
    }
    if (newIndex < 0) {
      newIndex = 0;
    }
    geometry = segmentData.geometry;
    coordinates = geometry.getCoordinates();
    component = coordinates;
    deleted = false;
    switch (geometry.getType()) {
      case ol.geom.GeometryType.MULTI_LINE_STRING:
        if (coordinates[segmentData.depth[0]].length > 2) {
          coordinates[segmentData.depth[0]].splice(index, 1);
          deleted = true;
        }
        break;
      case ol.geom.GeometryType.LINE_STRING:
        if (coordinates.length > 2) {
          coordinates.splice(index, 1);
          deleted = true;
        }
        break;
      case ol.geom.GeometryType.MULTI_POLYGON:
        component = component[segmentData.depth[1]];
        /* falls through */
      case ol.geom.GeometryType.POLYGON:
        component = component[segmentData.depth[0]];
        if (component.length > 4) {
          if (index == component.length - 1) {
            index = 0;
          }
          component.splice(index, 1);
          deleted = true;
          if (index === 0) {
            // close the ring again
            component.pop();
            component.push(component[0]);
            newIndex = component.length - 1;
          }
        }
        break;
      default:
        // pass
    }

    if (deleted) {
      this.setGeometryCoordinates_(geometry, coordinates);
      var segments = [];
      if (left !== undefined) {
        this.rBush_.remove(left);
        segments.push(left.segment[0]);
      }
      if (right !== undefined) {
        this.rBush_.remove(right);
        segments.push(right.segment[1]);
      }
      if (left !== undefined && right !== undefined) {
        goog.DEBUG && console.assert(newIndex >= 0, 'newIndex should be larger than 0');

        var newSegmentData = /** @type {ol.ModifySegmentDataType} */ ({
          depth: segmentData.depth,
          feature: segmentData.feature,
          geometry: segmentData.geometry,
          index: newIndex,
          segment: segments
        });
        this.rBush_.insert(ol.extent.boundingExtent(newSegmentData.segment),
            newSegmentData);
      }
      this.updateSegmentIndices_(geometry, index, segmentData.depth, -1);
      if (this.vertexFeature_) {
        this.overlay_.getSource().removeFeature(this.vertexFeature_);
        this.vertexFeature_ = null;
      }
    }

  }
  return deleted;
};


/**
 * @param {ol.geom.SimpleGeometry} geometry Geometry.
 * @param {Array} coordinates Coordinates.
 * @private
 */
ol.interaction.Modify.prototype.setGeometryCoordinates_ = function(geometry, coordinates) {
  this.changingFeature_ = true;
  geometry.setCoordinates(coordinates);
  this.changingFeature_ = false;
};


/**
 * @param {ol.geom.SimpleGeometry} geometry Geometry.
 * @param {number} index Index.
 * @param {Array.<number>|undefined} depth Depth.
 * @param {number} delta Delta (1 or -1).
 * @private
 */
ol.interaction.Modify.prototype.updateSegmentIndices_ = function(
    geometry, index, depth, delta) {
  this.rBush_.forEachInExtent(geometry.getExtent(), function(segmentDataMatch) {
    if (segmentDataMatch.geometry === geometry &&
        (depth === undefined || segmentDataMatch.depth === undefined ||
        ol.array.equals(segmentDataMatch.depth, depth)) &&
        segmentDataMatch.index > index) {
      segmentDataMatch.index += delta;
    }
  });
};


/**
 * @return {ol.StyleFunction} Styles.
 */
ol.interaction.Modify.getDefaultStyleFunction = function() {
  var style = ol.style.Style.createDefaultEditing();
  return function(feature, resolution) {
    return style[ol.geom.GeometryType.POINT];
  };
};

goog.provide('ol.interaction.Select');
goog.provide('ol.interaction.SelectEvent');
goog.provide('ol.interaction.SelectEventType');

goog.require('ol');
goog.require('ol.asserts');
goog.require('ol.functions');
goog.require('ol.Collection');
goog.require('ol.Feature');
goog.require('ol.array');
goog.require('ol.events');
goog.require('ol.events.Event');
goog.require('ol.events.condition');
goog.require('ol.geom.GeometryType');
goog.require('ol.interaction.Interaction');
goog.require('ol.layer.Vector');
goog.require('ol.obj');
goog.require('ol.source.Vector');
goog.require('ol.style.Style');


/**
 * @enum {string}
 */
ol.interaction.SelectEventType = {
  /**
   * Triggered when feature(s) has been (de)selected.
   * @event ol.interaction.SelectEvent#select
   * @api
   */
  SELECT: 'select'
};


/**
 * @classdesc
 * Events emitted by {@link ol.interaction.Select} instances are instances of
 * this type.
 *
 * @param {string} type The event type.
 * @param {Array.<ol.Feature>} selected Selected features.
 * @param {Array.<ol.Feature>} deselected Deselected features.
 * @param {ol.MapBrowserEvent} mapBrowserEvent Associated
 *     {@link ol.MapBrowserEvent}.
 * @implements {oli.SelectEvent}
 * @extends {ol.events.Event}
 * @constructor
 */
ol.interaction.SelectEvent = function(type, selected, deselected, mapBrowserEvent) {
  ol.events.Event.call(this, type);

  /**
   * Selected features array.
   * @type {Array.<ol.Feature>}
   * @api
   */
  this.selected = selected;

  /**
   * Deselected features array.
   * @type {Array.<ol.Feature>}
   * @api
   */
  this.deselected = deselected;

  /**
   * Associated {@link ol.MapBrowserEvent}.
   * @type {ol.MapBrowserEvent}
   * @api
   */
  this.mapBrowserEvent = mapBrowserEvent;
};
ol.inherits(ol.interaction.SelectEvent, ol.events.Event);


/**
 * @classdesc
 * Interaction for selecting vector features. By default, selected features are
 * styled differently, so this interaction can be used for visual highlighting,
 * as well as selecting features for other actions, such as modification or
 * output. There are three ways of controlling which features are selected:
 * using the browser event as defined by the `condition` and optionally the
 * `toggle`, `add`/`remove`, and `multi` options; a `layers` filter; and a
 * further feature filter using the `filter` option.
 *
 * Selected features are added to an internal unmanaged layer.
 *
 * @constructor
 * @extends {ol.interaction.Interaction}
 * @param {olx.interaction.SelectOptions=} opt_options Options.
 * @fires ol.interaction.SelectEvent
 * @api stable
 */
ol.interaction.Select = function(opt_options) {

  ol.interaction.Interaction.call(this, {
    handleEvent: ol.interaction.Select.handleEvent
  });

  var options = opt_options ? opt_options : {};

  /**
   * @private
   * @type {ol.EventsConditionType}
   */
  this.condition_ = options.condition ?
      options.condition : ol.events.condition.singleClick;

  /**
   * @private
   * @type {ol.EventsConditionType}
   */
  this.addCondition_ = options.addCondition ?
      options.addCondition : ol.events.condition.never;

  /**
   * @private
   * @type {ol.EventsConditionType}
   */
  this.removeCondition_ = options.removeCondition ?
      options.removeCondition : ol.events.condition.never;

  /**
   * @private
   * @type {ol.EventsConditionType}
   */
  this.toggleCondition_ = options.toggleCondition ?
      options.toggleCondition : ol.events.condition.shiftKeyOnly;

  /**
   * @private
   * @type {boolean}
   */
  this.multi_ = options.multi ? options.multi : false;

  /**
   * @private
   * @type {ol.SelectFilterFunction}
   */
  this.filter_ = options.filter ? options.filter :
      ol.functions.TRUE;

  var featureOverlay = new ol.layer.Vector({
    source: new ol.source.Vector({
      useSpatialIndex: false,
      features: options.features,
      wrapX: options.wrapX
    }),
    style: options.style ? options.style :
        ol.interaction.Select.getDefaultStyleFunction(),
    updateWhileAnimating: true,
    updateWhileInteracting: true
  });

  /**
   * @private
   * @type {ol.layer.Vector}
   */
  this.featureOverlay_ = featureOverlay;

  /** @type {function(ol.layer.Layer): boolean} */
  var layerFilter;
  if (options.layers) {
    if (typeof options.layers === 'function') {
      layerFilter = options.layers;
    } else {
      var layers = options.layers;
      layerFilter = function(layer) {
        return ol.array.includes(layers, layer);
      };
    }
  } else {
    layerFilter = ol.functions.TRUE;
  }

  /**
   * @private
   * @type {function(ol.layer.Layer): boolean}
   */
  this.layerFilter_ = layerFilter;

  /**
   * An association between selected feature (key)
   * and layer (value)
   * @private
   * @type {Object.<number, ol.layer.Layer>}
   */
  this.featureLayerAssociation_ = {};

  var features = this.featureOverlay_.getSource().getFeaturesCollection();
  ol.events.listen(features, ol.Collection.EventType.ADD,
      this.addFeature_, this);
  ol.events.listen(features, ol.Collection.EventType.REMOVE,
      this.removeFeature_, this);

};
ol.inherits(ol.interaction.Select, ol.interaction.Interaction);


/**
 * @param {ol.Feature|ol.render.Feature} feature Feature.
 * @param {ol.layer.Layer} layer Layer.
 * @private
 */
ol.interaction.Select.prototype.addFeatureLayerAssociation_ = function(feature, layer) {
  var key = ol.getUid(feature);
  this.featureLayerAssociation_[key] = layer;
};


/**
 * Get the selected features.
 * @return {ol.Collection.<ol.Feature>} Features collection.
 * @api stable
 */
ol.interaction.Select.prototype.getFeatures = function() {
  return this.featureOverlay_.getSource().getFeaturesCollection();
};


/**
 * Returns the associated {@link ol.layer.Vector vectorlayer} of
 * the (last) selected feature. Note that this will not work with any
 * programmatic method like pushing features to
 * {@link ol.interaction.Select#getFeatures collection}.
 * @param {ol.Feature|ol.render.Feature} feature Feature
 * @return {ol.layer.Vector} Layer.
 * @api
 */
ol.interaction.Select.prototype.getLayer = function(feature) {
  ol.asserts.assert(feature instanceof ol.Feature,
      42); // Expected an `ol.Feature`, but got an `ol.RenderFeature`
  var key = ol.getUid(feature);
  return /** @type {ol.layer.Vector} */ (this.featureLayerAssociation_[key]);
};


/**
 * Handles the {@link ol.MapBrowserEvent map browser event} and may change the
 * selected state of features.
 * @param {ol.MapBrowserEvent} mapBrowserEvent Map browser event.
 * @return {boolean} `false` to stop event propagation.
 * @this {ol.interaction.Select}
 * @api
 */
ol.interaction.Select.handleEvent = function(mapBrowserEvent) {
  if (!this.condition_(mapBrowserEvent)) {
    return true;
  }
  var add = this.addCondition_(mapBrowserEvent);
  var remove = this.removeCondition_(mapBrowserEvent);
  var toggle = this.toggleCondition_(mapBrowserEvent);
  var set = !add && !remove && !toggle;
  var map = mapBrowserEvent.map;
  var features = this.featureOverlay_.getSource().getFeaturesCollection();
  var deselected = [];
  var selected = [];
  if (set) {
    // Replace the currently selected feature(s) with the feature(s) at the
    // pixel, or clear the selected feature(s) if there is no feature at
    // the pixel.
    ol.obj.clear(this.featureLayerAssociation_);
    map.forEachFeatureAtPixel(mapBrowserEvent.pixel,
        /**
         * @param {ol.Feature|ol.render.Feature} feature Feature.
         * @param {ol.layer.Layer} layer Layer.
         * @return {boolean|undefined} Continue to iterate over the features.
         */
        function(feature, layer) {
          if (this.filter_(feature, layer)) {
            selected.push(feature);
            this.addFeatureLayerAssociation_(feature, layer);
            return !this.multi_;
          }
        }, this, this.layerFilter_);
    if (selected.length > 0 && features.getLength() == 1 && features.item(0) == selected[0]) {
      // No change; an already selected feature is selected again
      selected.length = 0;
    } else {
      if (features.getLength() !== 0) {
        deselected = Array.prototype.concat(features.getArray());
        features.clear();
      }
      features.extend(selected);
    }
  } else {
    // Modify the currently selected feature(s).
    map.forEachFeatureAtPixel(mapBrowserEvent.pixel,
        /**
         * @param {ol.Feature|ol.render.Feature} feature Feature.
         * @param {ol.layer.Layer} layer Layer.
         * @return {boolean|undefined} Continue to iterate over the features.
         */
        function(feature, layer) {
          if (this.filter_(feature, layer)) {
            if ((add || toggle) &&
                !ol.array.includes(features.getArray(), feature)) {
              selected.push(feature);
              this.addFeatureLayerAssociation_(feature, layer);
            } else if ((remove || toggle) &&
                ol.array.includes(features.getArray(), feature)) {
              deselected.push(feature);
              this.removeFeatureLayerAssociation_(feature);
            }
            return !this.multi_;
          }
        }, this, this.layerFilter_);
    var i;
    for (i = deselected.length - 1; i >= 0; --i) {
      features.remove(deselected[i]);
    }
    features.extend(selected);
  }
  if (selected.length > 0 || deselected.length > 0) {
    this.dispatchEvent(
        new ol.interaction.SelectEvent(ol.interaction.SelectEventType.SELECT,
            selected, deselected, mapBrowserEvent));
  }
  return ol.events.condition.pointerMove(mapBrowserEvent);
};


/**
 * Remove the interaction from its current map, if any,  and attach it to a new
 * map, if any. Pass `null` to just remove the interaction from the current map.
 * @param {ol.Map} map Map.
 * @api stable
 */
ol.interaction.Select.prototype.setMap = function(map) {
  var currentMap = this.getMap();
  var selectedFeatures =
      this.featureOverlay_.getSource().getFeaturesCollection();
  if (currentMap) {
    selectedFeatures.forEach(currentMap.unskipFeature, currentMap);
  }
  ol.interaction.Interaction.prototype.setMap.call(this, map);
  this.featureOverlay_.setMap(map);
  if (map) {
    selectedFeatures.forEach(map.skipFeature, map);
  }
};


/**
 * @return {ol.StyleFunction} Styles.
 */
ol.interaction.Select.getDefaultStyleFunction = function() {
  var styles = ol.style.Style.createDefaultEditing();
  ol.array.extend(styles[ol.geom.GeometryType.POLYGON],
      styles[ol.geom.GeometryType.LINE_STRING]);
  ol.array.extend(styles[ol.geom.GeometryType.GEOMETRY_COLLECTION],
      styles[ol.geom.GeometryType.LINE_STRING]);

  return function(feature, resolution) {
    return styles[feature.getGeometry().getType()];
  };
};


/**
 * @param {ol.Collection.Event} evt Event.
 * @private
 */
ol.interaction.Select.prototype.addFeature_ = function(evt) {
  var map = this.getMap();
  if (map) {
    map.skipFeature(/** @type {ol.Feature} */ (evt.element));
  }
};


/**
 * @param {ol.Collection.Event} evt Event.
 * @private
 */
ol.interaction.Select.prototype.removeFeature_ = function(evt) {
  var map = this.getMap();
  if (map) {
    map.unskipFeature(/** @type {ol.Feature} */ (evt.element));
  }
};


/**
 * @param {ol.Feature|ol.render.Feature} feature Feature.
 * @private
 */
ol.interaction.Select.prototype.removeFeatureLayerAssociation_ = function(feature) {
  var key = ol.getUid(feature);
  delete this.featureLayerAssociation_[key];
};

goog.provide('ol.interaction.Snap');
goog.provide('ol.interaction.SnapProperty');

goog.require('ol');
goog.require('ol.Collection');
goog.require('ol.Object');
goog.require('ol.Observable');
goog.require('ol.coordinate');
goog.require('ol.events');
goog.require('ol.events.EventType');
goog.require('ol.extent');
goog.require('ol.interaction.Pointer');
goog.require('ol.functions');
goog.require('ol.obj');
goog.require('ol.source.VectorEvent');
goog.require('ol.source.VectorEventType');
goog.require('ol.structs.RBush');


/**
 * @classdesc
 * Handles snapping of vector features while modifying or drawing them.  The
 * features can come from a {@link ol.source.Vector} or {@link ol.Collection}
 * Any interaction object that allows the user to interact
 * with the features using the mouse can benefit from the snapping, as long
 * as it is added before.
 *
 * The snap interaction modifies map browser event `coordinate` and `pixel`
 * properties to force the snap to occur to any interaction that them.
 *
 * Example:
 *
 *     var snap = new ol.interaction.Snap({
 *       source: source
 *     });
 *
 * @constructor
 * @extends {ol.interaction.Pointer}
 * @param {olx.interaction.SnapOptions=} opt_options Options.
 * @api
 */
ol.interaction.Snap = function(opt_options) {

  ol.interaction.Pointer.call(this, {
    handleEvent: ol.interaction.Snap.handleEvent_,
    handleDownEvent: ol.functions.TRUE,
    handleUpEvent: ol.interaction.Snap.handleUpEvent_
  });

  var options = opt_options ? opt_options : {};

  /**
   * @type {ol.source.Vector}
   * @private
   */
  this.source_ = options.source ? options.source : null;

  /**
   * @private
   * @type {boolean}
   */
  this.vertex_ = options.vertex !== undefined ? options.vertex : true;

  /**
   * @private
   * @type {boolean}
   */
  this.edge_ = options.edge !== undefined ? options.edge : true;

  /**
   * @type {ol.Collection.<ol.Feature>}
   * @private
   */
  this.features_ = options.features ? options.features : null;

  /**
   * @type {Array.<ol.EventsKey>}
   * @private
   */
  this.featuresListenerKeys_ = [];

  /**
   * @type {Object.<number, ol.EventsKey>}
   * @private
   */
  this.geometryChangeListenerKeys_ = {};

  /**
   * @type {Object.<number, ol.EventsKey>}
   * @private
   */
  this.geometryModifyListenerKeys_ = {};

  /**
   * Extents are preserved so indexed segment can be quickly removed
   * when its feature geometry changes
   * @type {Object.<number, ol.Extent>}
   * @private
   */
  this.indexedFeaturesExtents_ = {};

  /**
   * If a feature geometry changes while a pointer drag|move event occurs, the
   * feature doesn't get updated right away.  It will be at the next 'pointerup'
   * event fired.
   * @type {Object.<number, ol.Feature>}
   * @private
   */
  this.pendingFeatures_ = {};

  /**
   * Used for distance sorting in sortByDistance_
   * @type {ol.Coordinate}
   * @private
   */
  this.pixelCoordinate_ = null;

  /**
   * @type {number}
   * @private
   */
  this.pixelTolerance_ = options.pixelTolerance !== undefined ?
      options.pixelTolerance : 10;

  /**
   * @type {function(ol.SnapSegmentDataType, ol.SnapSegmentDataType): number}
   * @private
   */
  this.sortByDistance_ = ol.interaction.Snap.sortByDistance.bind(this);


  /**
  * Segment RTree for each layer
  * @type {ol.structs.RBush.<ol.SnapSegmentDataType>}
  * @private
  */
  this.rBush_ = new ol.structs.RBush();


  /**
  * @const
  * @private
  * @type {Object.<string, function(ol.Feature, ol.geom.Geometry)>}
  */
  this.SEGMENT_WRITERS_ = {
    'Point': this.writePointGeometry_,
    'LineString': this.writeLineStringGeometry_,
    'LinearRing': this.writeLineStringGeometry_,
    'Polygon': this.writePolygonGeometry_,
    'MultiPoint': this.writeMultiPointGeometry_,
    'MultiLineString': this.writeMultiLineStringGeometry_,
    'MultiPolygon': this.writeMultiPolygonGeometry_,
    'GeometryCollection': this.writeGeometryCollectionGeometry_
  };
};
ol.inherits(ol.interaction.Snap, ol.interaction.Pointer);


/**
 * Add a feature to the collection of features that we may snap to.
 * @param {ol.Feature} feature Feature.
 * @param {boolean=} opt_listen Whether to listen to the geometry change or not
 *     Defaults to `true`.
 * @api
 */
ol.interaction.Snap.prototype.addFeature = function(feature, opt_listen) {
  var listen = opt_listen !== undefined ? opt_listen : true;
  var feature_uid = ol.getUid(feature);
  var geometry = feature.getGeometry();
  if (geometry) {
    var segmentWriter = this.SEGMENT_WRITERS_[geometry.getType()];
    if (segmentWriter) {
      this.indexedFeaturesExtents_[feature_uid] = geometry.getExtent(
          ol.extent.createEmpty());
      segmentWriter.call(this, feature, geometry);

      if (listen) {
        this.geometryModifyListenerKeys_[feature_uid] = ol.events.listen(
            geometry,
            ol.events.EventType.CHANGE,
            this.handleGeometryModify_.bind(this, feature),
            this);
      }
    }
  }

  if (listen) {
    this.geometryChangeListenerKeys_[feature_uid] = ol.events.listen(
        feature,
        ol.Object.getChangeEventType(feature.getGeometryName()),
        this.handleGeometryChange_, this);
  }
};


/**
 * @param {ol.Feature} feature Feature.
 * @private
 */
ol.interaction.Snap.prototype.forEachFeatureAdd_ = function(feature) {
  this.addFeature(feature);
};


/**
 * @param {ol.Feature} feature Feature.
 * @private
 */
ol.interaction.Snap.prototype.forEachFeatureRemove_ = function(feature) {
  this.removeFeature(feature);
};


/**
 * @return {ol.Collection.<ol.Feature>|Array.<ol.Feature>} Features.
 * @private
 */
ol.interaction.Snap.prototype.getFeatures_ = function() {
  var features;
  if (this.features_) {
    features = this.features_;
  } else if (this.source_) {
    features = this.source_.getFeatures();
  }
  return /** @type {!Array.<ol.Feature>|!ol.Collection.<ol.Feature>} */ (features);
};


/**
 * @param {ol.source.VectorEvent|ol.Collection.Event} evt Event.
 * @private
 */
ol.interaction.Snap.prototype.handleFeatureAdd_ = function(evt) {
  var feature;
  if (evt instanceof ol.source.VectorEvent) {
    feature = evt.feature;
  } else if (evt instanceof ol.Collection.Event) {
    feature = evt.element;
  }
  this.addFeature(/** @type {ol.Feature} */ (feature));
};


/**
 * @param {ol.source.VectorEvent|ol.Collection.Event} evt Event.
 * @private
 */
ol.interaction.Snap.prototype.handleFeatureRemove_ = function(evt) {
  var feature;
  if (evt instanceof ol.source.VectorEvent) {
    feature = evt.feature;
  } else if (evt instanceof ol.Collection.Event) {
    feature = evt.element;
  }
  this.removeFeature(/** @type {ol.Feature} */ (feature));
};


/**
 * @param {ol.events.Event} evt Event.
 * @private
 */
ol.interaction.Snap.prototype.handleGeometryChange_ = function(evt) {
  var feature = /** @type {ol.Feature} */ (evt.target);
  this.removeFeature(feature, true);
  this.addFeature(feature, true);
};


/**
 * @param {ol.Feature} feature Feature which geometry was modified.
 * @param {ol.events.Event} evt Event.
 * @private
 */
ol.interaction.Snap.prototype.handleGeometryModify_ = function(feature, evt) {
  if (this.handlingDownUpSequence) {
    var uid = ol.getUid(feature);
    if (!(uid in this.pendingFeatures_)) {
      this.pendingFeatures_[uid] = feature;
    }
  } else {
    this.updateFeature_(feature);
  }
};


/**
 * Remove a feature from the collection of features that we may snap to.
 * @param {ol.Feature} feature Feature
 * @param {boolean=} opt_unlisten Whether to unlisten to the geometry change
 *     or not. Defaults to `true`.
 * @api
 */
ol.interaction.Snap.prototype.removeFeature = function(feature, opt_unlisten) {
  var unlisten = opt_unlisten !== undefined ? opt_unlisten : true;
  var feature_uid = ol.getUid(feature);
  var extent = this.indexedFeaturesExtents_[feature_uid];
  if (extent) {
    var rBush = this.rBush_;
    var i, nodesToRemove = [];
    rBush.forEachInExtent(extent, function(node) {
      if (feature === node.feature) {
        nodesToRemove.push(node);
      }
    });
    for (i = nodesToRemove.length - 1; i >= 0; --i) {
      rBush.remove(nodesToRemove[i]);
    }
    if (unlisten) {
      ol.Observable.unByKey(this.geometryModifyListenerKeys_[feature_uid]);
      delete this.geometryModifyListenerKeys_[feature_uid];
    }
  }

  if (unlisten) {
    ol.Observable.unByKey(this.geometryChangeListenerKeys_[feature_uid]);
    delete this.geometryChangeListenerKeys_[feature_uid];
  }
};


/**
 * @inheritDoc
 */
ol.interaction.Snap.prototype.setMap = function(map) {
  var currentMap = this.getMap();
  var keys = this.featuresListenerKeys_;
  var features = this.getFeatures_();

  if (currentMap) {
    keys.forEach(ol.Observable.unByKey);
    keys.length = 0;
    features.forEach(this.forEachFeatureRemove_, this);
  }
  ol.interaction.Pointer.prototype.setMap.call(this, map);

  if (map) {
    if (this.features_) {
      keys.push(
        ol.events.listen(this.features_, ol.Collection.EventType.ADD,
            this.handleFeatureAdd_, this),
        ol.events.listen(this.features_, ol.Collection.EventType.REMOVE,
            this.handleFeatureRemove_, this)
      );
    } else if (this.source_) {
      keys.push(
        ol.events.listen(this.source_, ol.source.VectorEventType.ADDFEATURE,
            this.handleFeatureAdd_, this),
        ol.events.listen(this.source_, ol.source.VectorEventType.REMOVEFEATURE,
            this.handleFeatureRemove_, this)
      );
    }
    features.forEach(this.forEachFeatureAdd_, this);
  }
};


/**
 * @inheritDoc
 */
ol.interaction.Snap.prototype.shouldStopEvent = ol.functions.FALSE;


/**
 * @param {ol.Pixel} pixel Pixel
 * @param {ol.Coordinate} pixelCoordinate Coordinate
 * @param {ol.Map} map Map.
 * @return {ol.SnapResultType} Snap result
 */
ol.interaction.Snap.prototype.snapTo = function(pixel, pixelCoordinate, map) {

  var lowerLeft = map.getCoordinateFromPixel(
      [pixel[0] - this.pixelTolerance_, pixel[1] + this.pixelTolerance_]);
  var upperRight = map.getCoordinateFromPixel(
      [pixel[0] + this.pixelTolerance_, pixel[1] - this.pixelTolerance_]);
  var box = ol.extent.boundingExtent([lowerLeft, upperRight]);

  var segments = this.rBush_.getInExtent(box);
  var snappedToVertex = false;
  var snapped = false;
  var vertex = null;
  var vertexPixel = null;
  var dist, pixel1, pixel2, squaredDist1, squaredDist2;
  if (segments.length > 0) {
    this.pixelCoordinate_ = pixelCoordinate;
    segments.sort(this.sortByDistance_);
    var closestSegment = segments[0].segment;
    if (this.vertex_ && !this.edge_) {
      pixel1 = map.getPixelFromCoordinate(closestSegment[0]);
      pixel2 = map.getPixelFromCoordinate(closestSegment[1]);
      squaredDist1 = ol.coordinate.squaredDistance(pixel, pixel1);
      squaredDist2 = ol.coordinate.squaredDistance(pixel, pixel2);
      dist = Math.sqrt(Math.min(squaredDist1, squaredDist2));
      snappedToVertex = dist <= this.pixelTolerance_;
      if (snappedToVertex) {
        snapped = true;
        vertex = squaredDist1 > squaredDist2 ?
            closestSegment[1] : closestSegment[0];
        vertexPixel = map.getPixelFromCoordinate(vertex);
      }
    } else if (this.edge_) {
      vertex = (ol.coordinate.closestOnSegment(pixelCoordinate,
          closestSegment));
      vertexPixel = map.getPixelFromCoordinate(vertex);
      if (Math.sqrt(ol.coordinate.squaredDistance(pixel, vertexPixel)) <=
          this.pixelTolerance_) {
        snapped = true;
        if (this.vertex_) {
          pixel1 = map.getPixelFromCoordinate(closestSegment[0]);
          pixel2 = map.getPixelFromCoordinate(closestSegment[1]);
          squaredDist1 = ol.coordinate.squaredDistance(vertexPixel, pixel1);
          squaredDist2 = ol.coordinate.squaredDistance(vertexPixel, pixel2);
          dist = Math.sqrt(Math.min(squaredDist1, squaredDist2));
          snappedToVertex = dist <= this.pixelTolerance_;
          if (snappedToVertex) {
            vertex = squaredDist1 > squaredDist2 ?
                closestSegment[1] : closestSegment[0];
            vertexPixel = map.getPixelFromCoordinate(vertex);
          }
        }
      }
    }
    if (snapped) {
      vertexPixel = [Math.round(vertexPixel[0]), Math.round(vertexPixel[1])];
    }
  }
  return /** @type {ol.SnapResultType} */ ({
    snapped: snapped,
    vertex: vertex,
    vertexPixel: vertexPixel
  });
};


/**
 * @param {ol.Feature} feature Feature
 * @private
 */
ol.interaction.Snap.prototype.updateFeature_ = function(feature) {
  this.removeFeature(feature, false);
  this.addFeature(feature, false);
};


/**
 * @param {ol.Feature} feature Feature
 * @param {ol.geom.GeometryCollection} geometry Geometry.
 * @private
 */
ol.interaction.Snap.prototype.writeGeometryCollectionGeometry_ = function(feature, geometry) {
  var i, geometries = geometry.getGeometriesArray();
  for (i = 0; i < geometries.length; ++i) {
    this.SEGMENT_WRITERS_[geometries[i].getType()].call(
        this, feature, geometries[i]);
  }
};


/**
 * @param {ol.Feature} feature Feature
 * @param {ol.geom.LineString} geometry Geometry.
 * @private
 */
ol.interaction.Snap.prototype.writeLineStringGeometry_ = function(feature, geometry) {
  var coordinates = geometry.getCoordinates();
  var i, ii, segment, segmentData;
  for (i = 0, ii = coordinates.length - 1; i < ii; ++i) {
    segment = coordinates.slice(i, i + 2);
    segmentData = /** @type {ol.SnapSegmentDataType} */ ({
      feature: feature,
      segment: segment
    });
    this.rBush_.insert(ol.extent.boundingExtent(segment), segmentData);
  }
};


/**
 * @param {ol.Feature} feature Feature
 * @param {ol.geom.MultiLineString} geometry Geometry.
 * @private
 */
ol.interaction.Snap.prototype.writeMultiLineStringGeometry_ = function(feature, geometry) {
  var lines = geometry.getCoordinates();
  var coordinates, i, ii, j, jj, segment, segmentData;
  for (j = 0, jj = lines.length; j < jj; ++j) {
    coordinates = lines[j];
    for (i = 0, ii = coordinates.length - 1; i < ii; ++i) {
      segment = coordinates.slice(i, i + 2);
      segmentData = /** @type {ol.SnapSegmentDataType} */ ({
        feature: feature,
        segment: segment
      });
      this.rBush_.insert(ol.extent.boundingExtent(segment), segmentData);
    }
  }
};


/**
 * @param {ol.Feature} feature Feature
 * @param {ol.geom.MultiPoint} geometry Geometry.
 * @private
 */
ol.interaction.Snap.prototype.writeMultiPointGeometry_ = function(feature, geometry) {
  var points = geometry.getCoordinates();
  var coordinates, i, ii, segmentData;
  for (i = 0, ii = points.length; i < ii; ++i) {
    coordinates = points[i];
    segmentData = /** @type {ol.SnapSegmentDataType} */ ({
      feature: feature,
      segment: [coordinates, coordinates]
    });
    this.rBush_.insert(geometry.getExtent(), segmentData);
  }
};


/**
 * @param {ol.Feature} feature Feature
 * @param {ol.geom.MultiPolygon} geometry Geometry.
 * @private
 */
ol.interaction.Snap.prototype.writeMultiPolygonGeometry_ = function(feature, geometry) {
  var polygons = geometry.getCoordinates();
  var coordinates, i, ii, j, jj, k, kk, rings, segment, segmentData;
  for (k = 0, kk = polygons.length; k < kk; ++k) {
    rings = polygons[k];
    for (j = 0, jj = rings.length; j < jj; ++j) {
      coordinates = rings[j];
      for (i = 0, ii = coordinates.length - 1; i < ii; ++i) {
        segment = coordinates.slice(i, i + 2);
        segmentData = /** @type {ol.SnapSegmentDataType} */ ({
          feature: feature,
          segment: segment
        });
        this.rBush_.insert(ol.extent.boundingExtent(segment), segmentData);
      }
    }
  }
};


/**
 * @param {ol.Feature} feature Feature
 * @param {ol.geom.Point} geometry Geometry.
 * @private
 */
ol.interaction.Snap.prototype.writePointGeometry_ = function(feature, geometry) {
  var coordinates = geometry.getCoordinates();
  var segmentData = /** @type {ol.SnapSegmentDataType} */ ({
    feature: feature,
    segment: [coordinates, coordinates]
  });
  this.rBush_.insert(geometry.getExtent(), segmentData);
};


/**
 * @param {ol.Feature} feature Feature
 * @param {ol.geom.Polygon} geometry Geometry.
 * @private
 */
ol.interaction.Snap.prototype.writePolygonGeometry_ = function(feature, geometry) {
  var rings = geometry.getCoordinates();
  var coordinates, i, ii, j, jj, segment, segmentData;
  for (j = 0, jj = rings.length; j < jj; ++j) {
    coordinates = rings[j];
    for (i = 0, ii = coordinates.length - 1; i < ii; ++i) {
      segment = coordinates.slice(i, i + 2);
      segmentData = /** @type {ol.SnapSegmentDataType} */ ({
        feature: feature,
        segment: segment
      });
      this.rBush_.insert(ol.extent.boundingExtent(segment), segmentData);
    }
  }
};


/**
 * Handle all pointer events events.
 * @param {ol.MapBrowserEvent} evt A move event.
 * @return {boolean} Pass the event to other interactions.
 * @this {ol.interaction.Snap}
 * @private
 */
ol.interaction.Snap.handleEvent_ = function(evt) {
  var result = this.snapTo(evt.pixel, evt.coordinate, evt.map);
  if (result.snapped) {
    evt.coordinate = result.vertex.slice(0, 2);
    evt.pixel = result.vertexPixel;
  }
  return ol.interaction.Pointer.handleEvent.call(this, evt);
};


/**
 * @param {ol.MapBrowserPointerEvent} evt Event.
 * @return {boolean} Stop drag sequence?
 * @this {ol.interaction.Snap}
 * @private
 */
ol.interaction.Snap.handleUpEvent_ = function(evt) {
  var featuresToUpdate = ol.obj.getValues(this.pendingFeatures_);
  if (featuresToUpdate.length) {
    featuresToUpdate.forEach(this.updateFeature_, this);
    this.pendingFeatures_ = {};
  }
  return false;
};


/**
 * Sort segments by distance, helper function
 * @param {ol.SnapSegmentDataType} a The first segment data.
 * @param {ol.SnapSegmentDataType} b The second segment data.
 * @return {number} The difference in distance.
 * @this {ol.interaction.Snap}
 */
ol.interaction.Snap.sortByDistance = function(a, b) {
  return ol.coordinate.squaredDistanceToSegment(
      this.pixelCoordinate_, a.segment) -
      ol.coordinate.squaredDistanceToSegment(
      this.pixelCoordinate_, b.segment);
};

goog.provide('ol.interaction.Translate');
goog.provide('ol.interaction.TranslateEvent');

goog.require('ol');
goog.require('ol.events.Event');
goog.require('ol.array');
goog.require('ol.interaction.Pointer');


/**
 * @enum {string}
 */
ol.interaction.TranslateEventType = {
  /**
   * Triggered upon feature translation start.
   * @event ol.interaction.TranslateEvent#translatestart
   * @api
   */
  TRANSLATESTART: 'translatestart',
  /**
   * Triggered upon feature translation.
   * @event ol.interaction.TranslateEvent#translating
   * @api
   */
  TRANSLATING: 'translating',
  /**
   * Triggered upon feature translation end.
   * @event ol.interaction.TranslateEvent#translateend
   * @api
   */
  TRANSLATEEND: 'translateend'
};


/**
 * @classdesc
 * Events emitted by {@link ol.interaction.Translate} instances are instances of
 * this type.
 *
 * @constructor
 * @extends {ol.events.Event}
 * @implements {oli.interaction.TranslateEvent}
 * @param {ol.interaction.TranslateEventType} type Type.
 * @param {ol.Collection.<ol.Feature>} features The features translated.
 * @param {ol.Coordinate} coordinate The event coordinate.
 */
ol.interaction.TranslateEvent = function(type, features, coordinate) {

  ol.events.Event.call(this, type);

  /**
   * The features being translated.
   * @type {ol.Collection.<ol.Feature>}
   * @api
   */
  this.features = features;

  /**
   * The coordinate of the drag event.
   * @const
   * @type {ol.Coordinate}
   * @api
   */
  this.coordinate = coordinate;
};
ol.inherits(ol.interaction.TranslateEvent, ol.events.Event);


/**
 * @classdesc
 * Interaction for translating (moving) features.
 *
 * @constructor
 * @extends {ol.interaction.Pointer}
 * @fires ol.interaction.TranslateEvent
 * @param {olx.interaction.TranslateOptions} options Options.
 * @api
 */
ol.interaction.Translate = function(options) {
  ol.interaction.Pointer.call(this, {
    handleDownEvent: ol.interaction.Translate.handleDownEvent_,
    handleDragEvent: ol.interaction.Translate.handleDragEvent_,
    handleMoveEvent: ol.interaction.Translate.handleMoveEvent_,
    handleUpEvent: ol.interaction.Translate.handleUpEvent_
  });


  /**
   * @type {string|undefined}
   * @private
   */
  this.previousCursor_ = undefined;


  /**
   * The last position we translated to.
   * @type {ol.Coordinate}
   * @private
   */
  this.lastCoordinate_ = null;


  /**
   * @type {ol.Collection.<ol.Feature>}
   * @private
   */
  this.features_ = options.features !== undefined ? options.features : null;

  /** @type {function(ol.layer.Layer): boolean} */
  var layerFilter;
  if (options.layers) {
    if (typeof options.layers === 'function') {
      layerFilter = options.layers;
    } else {
      var layers = options.layers;
      layerFilter = function(layer) {
        return ol.array.includes(layers, layer);
      };
    }
  } else {
    layerFilter = ol.functions.TRUE;
  }

  /**
   * @private
   * @type {function(ol.layer.Layer): boolean}
   */
  this.layerFilter_ = layerFilter;

  /**
   * @type {ol.Feature}
   * @private
   */
  this.lastFeature_ = null;
};
ol.inherits(ol.interaction.Translate, ol.interaction.Pointer);


/**
 * @param {ol.MapBrowserPointerEvent} event Event.
 * @return {boolean} Start drag sequence?
 * @this {ol.interaction.Translate}
 * @private
 */
ol.interaction.Translate.handleDownEvent_ = function(event) {
  this.lastFeature_ = this.featuresAtPixel_(event.pixel, event.map);
  if (!this.lastCoordinate_ && this.lastFeature_) {
    this.lastCoordinate_ = event.coordinate;
    ol.interaction.Translate.handleMoveEvent_.call(this, event);
    this.dispatchEvent(
        new ol.interaction.TranslateEvent(
            ol.interaction.TranslateEventType.TRANSLATESTART, this.features_,
            event.coordinate));
    return true;
  }
  return false;
};


/**
 * @param {ol.MapBrowserPointerEvent} event Event.
 * @return {boolean} Stop drag sequence?
 * @this {ol.interaction.Translate}
 * @private
 */
ol.interaction.Translate.handleUpEvent_ = function(event) {
  if (this.lastCoordinate_) {
    this.lastCoordinate_ = null;
    ol.interaction.Translate.handleMoveEvent_.call(this, event);
    this.dispatchEvent(
        new ol.interaction.TranslateEvent(
            ol.interaction.TranslateEventType.TRANSLATEEND, this.features_,
            event.coordinate));
    return true;
  }
  return false;
};


/**
 * @param {ol.MapBrowserPointerEvent} event Event.
 * @this {ol.interaction.Translate}
 * @private
 */
ol.interaction.Translate.handleDragEvent_ = function(event) {
  if (this.lastCoordinate_) {
    var newCoordinate = event.coordinate;
    var deltaX = newCoordinate[0] - this.lastCoordinate_[0];
    var deltaY = newCoordinate[1] - this.lastCoordinate_[1];

    if (this.features_) {
      this.features_.forEach(function(feature) {
        var geom = feature.getGeometry();
        geom.translate(deltaX, deltaY);
        feature.setGeometry(geom);
      });
    } else if (this.lastFeature_) {
      var geom = this.lastFeature_.getGeometry();
      geom.translate(deltaX, deltaY);
      this.lastFeature_.setGeometry(geom);
    }

    this.lastCoordinate_ = newCoordinate;
    this.dispatchEvent(
        new ol.interaction.TranslateEvent(
            ol.interaction.TranslateEventType.TRANSLATING, this.features_,
            newCoordinate));
  }
};


/**
 * @param {ol.MapBrowserEvent} event Event.
 * @this {ol.interaction.Translate}
 * @private
 */
ol.interaction.Translate.handleMoveEvent_ = function(event) {
  var elem = event.map.getTargetElement();

  // Change the cursor to grab/grabbing if hovering any of the features managed
  // by the interaction
  if (this.featuresAtPixel_(event.pixel, event.map)) {
    this.previousCursor_ = elem.style.cursor;
    // WebKit browsers don't support the grab icons without a prefix
    elem.style.cursor = this.lastCoordinate_ ?
        '-webkit-grabbing' : '-webkit-grab';

    // Thankfully, attempting to set the standard ones will silently fail,
    // keeping the prefixed icons
    elem.style.cursor = this.lastCoordinate_ ?  'grabbing' : 'grab';
  } else {
    elem.style.cursor = this.previousCursor_ !== undefined ?
        this.previousCursor_ : '';
    this.previousCursor_ = undefined;
  }
};


/**
 * Tests to see if the given coordinates intersects any of our selected
 * features.
 * @param {ol.Pixel} pixel Pixel coordinate to test for intersection.
 * @param {ol.Map} map Map to test the intersection on.
 * @return {ol.Feature} Returns the feature found at the specified pixel
 * coordinates.
 * @private
 */
ol.interaction.Translate.prototype.featuresAtPixel_ = function(pixel, map) {
  var found = null;

  var intersectingFeature = map.forEachFeatureAtPixel(pixel,
      function(feature) {
        return feature;
      }, this, this.layerFilter_);

  if (this.features_ &&
      ol.array.includes(this.features_.getArray(), intersectingFeature)) {
    found = intersectingFeature;
  }

  return found;
};

goog.provide('ol.layer.Heatmap');

goog.require('ol.events');
goog.require('ol');
goog.require('ol.Object');
goog.require('ol.dom');
goog.require('ol.layer.Vector');
goog.require('ol.math');
goog.require('ol.obj');
goog.require('ol.render.EventType');
goog.require('ol.style.Icon');
goog.require('ol.style.Style');


/**
 * @enum {string}
 */
ol.layer.HeatmapLayerProperty = {
  BLUR: 'blur',
  GRADIENT: 'gradient',
  RADIUS: 'radius'
};


/**
 * @classdesc
 * Layer for rendering vector data as a heatmap.
 * Note that any property set in the options is set as a {@link ol.Object}
 * property on the layer object; for example, setting `title: 'My Title'` in the
 * options means that `title` is observable, and has get/set accessors.
 *
 * @constructor
 * @extends {ol.layer.Vector}
 * @fires ol.render.Event
 * @param {olx.layer.HeatmapOptions=} opt_options Options.
 * @api
 */
ol.layer.Heatmap = function(opt_options) {
  var options = opt_options ? opt_options : {};

  var baseOptions = ol.obj.assign({}, options);

  delete baseOptions.gradient;
  delete baseOptions.radius;
  delete baseOptions.blur;
  delete baseOptions.shadow;
  delete baseOptions.weight;
  ol.layer.Vector.call(this, /** @type {olx.layer.VectorOptions} */ (baseOptions));

  /**
   * @private
   * @type {Uint8ClampedArray}
   */
  this.gradient_ = null;

  /**
   * @private
   * @type {number}
   */
  this.shadow_ = options.shadow !== undefined ? options.shadow : 250;

  /**
   * @private
   * @type {string|undefined}
   */
  this.circleImage_ = undefined;

  /**
   * @private
   * @type {Array.<Array.<ol.style.Style>>}
   */
  this.styleCache_ = null;

  ol.events.listen(this,
      ol.Object.getChangeEventType(ol.layer.HeatmapLayerProperty.GRADIENT),
      this.handleGradientChanged_, this);

  this.setGradient(options.gradient ?
      options.gradient : ol.layer.Heatmap.DEFAULT_GRADIENT);

  this.setBlur(options.blur !== undefined ? options.blur : 15);

  this.setRadius(options.radius !== undefined ? options.radius : 8);

  ol.events.listen(this,
      ol.Object.getChangeEventType(ol.layer.HeatmapLayerProperty.BLUR),
      this.handleStyleChanged_, this);
  ol.events.listen(this,
      ol.Object.getChangeEventType(ol.layer.HeatmapLayerProperty.RADIUS),
      this.handleStyleChanged_, this);

  this.handleStyleChanged_();

  var weight = options.weight ? options.weight : 'weight';
  var weightFunction;
  if (typeof weight === 'string') {
    weightFunction = function(feature) {
      return feature.get(weight);
    };
  } else {
    weightFunction = weight;
  }
  goog.DEBUG && console.assert(typeof weightFunction === 'function',
      'weightFunction should be a function');

  this.setStyle(function(feature, resolution) {
    goog.DEBUG && console.assert(this.styleCache_, 'this.styleCache_ expected');
    goog.DEBUG && console.assert(this.circleImage_ !== undefined,
        'this.circleImage_ should be defined');
    var weight = weightFunction(feature);
    var opacity = weight !== undefined ? ol.math.clamp(weight, 0, 1) : 1;
    // cast to 8 bits
    var index = (255 * opacity) | 0;
    var style = this.styleCache_[index];
    if (!style) {
      style = [
        new ol.style.Style({
          image: new ol.style.Icon({
            opacity: opacity,
            src: this.circleImage_
          })
        })
      ];
      this.styleCache_[index] = style;
    }
    return style;
  }.bind(this));

  // For performance reasons, don't sort the features before rendering.
  // The render order is not relevant for a heatmap representation.
  this.setRenderOrder(null);

  ol.events.listen(this, ol.render.EventType.RENDER, this.handleRender_, this);

};
ol.inherits(ol.layer.Heatmap, ol.layer.Vector);


/**
 * @const
 * @type {Array.<string>}
 */
ol.layer.Heatmap.DEFAULT_GRADIENT = ['#00f', '#0ff', '#0f0', '#ff0', '#f00'];


/**
 * @param {Array.<string>} colors A list of colored.
 * @return {Uint8ClampedArray} An array.
 * @private
 */
ol.layer.Heatmap.createGradient_ = function(colors) {
  var width = 1;
  var height = 256;
  var context = ol.dom.createCanvasContext2D(width, height);

  var gradient = context.createLinearGradient(0, 0, width, height);
  var step = 1 / (colors.length - 1);
  for (var i = 0, ii = colors.length; i < ii; ++i) {
    gradient.addColorStop(i * step, colors[i]);
  }

  context.fillStyle = gradient;
  context.fillRect(0, 0, width, height);

  return context.getImageData(0, 0, width, height).data;
};


/**
 * @return {string} Data URL for a circle.
 * @private
 */
ol.layer.Heatmap.prototype.createCircle_ = function() {
  var radius = this.getRadius();
  var blur = this.getBlur();
  goog.DEBUG && console.assert(radius !== undefined && blur !== undefined,
      'radius and blur should be defined');
  var halfSize = radius + blur + 1;
  var size = 2 * halfSize;
  var context = ol.dom.createCanvasContext2D(size, size);
  context.shadowOffsetX = context.shadowOffsetY = this.shadow_;
  context.shadowBlur = blur;
  context.shadowColor = '#000';
  context.beginPath();
  var center = halfSize - this.shadow_;
  context.arc(center, center, radius, 0, Math.PI * 2, true);
  context.fill();
  return context.canvas.toDataURL();
};


/**
 * Return the blur size in pixels.
 * @return {number} Blur size in pixels.
 * @api
 * @observable
 */
ol.layer.Heatmap.prototype.getBlur = function() {
  return /** @type {number} */ (this.get(ol.layer.HeatmapLayerProperty.BLUR));
};


/**
 * Return the gradient colors as array of strings.
 * @return {Array.<string>} Colors.
 * @api
 * @observable
 */
ol.layer.Heatmap.prototype.getGradient = function() {
  return /** @type {Array.<string>} */ (
      this.get(ol.layer.HeatmapLayerProperty.GRADIENT));
};


/**
 * Return the size of the radius in pixels.
 * @return {number} Radius size in pixel.
 * @api
 * @observable
 */
ol.layer.Heatmap.prototype.getRadius = function() {
  return /** @type {number} */ (this.get(ol.layer.HeatmapLayerProperty.RADIUS));
};


/**
 * @private
 */
ol.layer.Heatmap.prototype.handleGradientChanged_ = function() {
  this.gradient_ = ol.layer.Heatmap.createGradient_(this.getGradient());
};


/**
 * @private
 */
ol.layer.Heatmap.prototype.handleStyleChanged_ = function() {
  this.circleImage_ = this.createCircle_();
  this.styleCache_ = new Array(256);
  this.changed();
};


/**
 * @param {ol.render.Event} event Post compose event
 * @private
 */
ol.layer.Heatmap.prototype.handleRender_ = function(event) {
  goog.DEBUG && console.assert(event.type == ol.render.EventType.RENDER,
      'event.type should be RENDER');
  goog.DEBUG && console.assert(this.gradient_, 'this.gradient_ expected');
  var context = event.context;
  var canvas = context.canvas;
  var image = context.getImageData(0, 0, canvas.width, canvas.height);
  var view8 = image.data;
  var i, ii, alpha;
  for (i = 0, ii = view8.length; i < ii; i += 4) {
    alpha = view8[i + 3] * 4;
    if (alpha) {
      view8[i] = this.gradient_[alpha];
      view8[i + 1] = this.gradient_[alpha + 1];
      view8[i + 2] = this.gradient_[alpha + 2];
    }
  }
  context.putImageData(image, 0, 0);
};


/**
 * Set the blur size in pixels.
 * @param {number} blur Blur size in pixels.
 * @api
 * @observable
 */
ol.layer.Heatmap.prototype.setBlur = function(blur) {
  this.set(ol.layer.HeatmapLayerProperty.BLUR, blur);
};


/**
 * Set the gradient colors as array of strings.
 * @param {Array.<string>} colors Gradient.
 * @api
 * @observable
 */
ol.layer.Heatmap.prototype.setGradient = function(colors) {
  this.set(ol.layer.HeatmapLayerProperty.GRADIENT, colors);
};


/**
 * Set the size of the radius in pixels.
 * @param {number} radius Radius size in pixel.
 * @api
 * @observable
 */
ol.layer.Heatmap.prototype.setRadius = function(radius) {
  this.set(ol.layer.HeatmapLayerProperty.RADIUS, radius);
};

goog.provide('ol.net');

goog.require('ol');


/**
 * Simple JSONP helper. Supports error callbacks and a custom callback param.
 * The error callback will be called when no JSONP is executed after 10 seconds.
 *
 * @param {string} url Request url. A 'callback' query parameter will be
 *     appended.
 * @param {Function} callback Callback on success.
 * @param {function()=} opt_errback Callback on error.
 * @param {string=} opt_callbackParam Custom query parameter for the JSONP
 *     callback. Default is 'callback'.
 */
ol.net.jsonp = function(url, callback, opt_errback, opt_callbackParam) {
  var script = ol.global.document.createElement('script');
  var key = 'olc_' + ol.getUid(callback);
  function cleanup() {
    delete ol.global[key];
    script.parentNode.removeChild(script);
  }
  script.async = true;
  script.src = url + (url.indexOf('?') == -1 ? '?' : '&') +
      (opt_callbackParam || 'callback') + '=' + key;
  var timer = ol.global.setTimeout(function() {
    cleanup();
    if (opt_errback) {
      opt_errback();
    }
  }, 10000);
  ol.global[key] = function(data) {
    ol.global.clearTimeout(timer);
    cleanup();
    callback(data);
  };
  ol.global.document.getElementsByTagName('head')[0].appendChild(script);
};

goog.provide('ol.render');

goog.require('ol.has');
goog.require('ol.transform');
goog.require('ol.render.canvas.Immediate');


/**
 * Binds a Canvas Immediate API to a canvas context, to allow drawing geometries
 * to the context's canvas.
 *
 * The units for geometry coordinates are css pixels relative to the top left
 * corner of the canvas element.
 * ```js
 * var canvas = document.createElement('canvas');
 * var render = ol.render.toContext(canvas.getContext('2d'),
 *     { size: [100, 100] });
 * render.setFillStrokeStyle(new ol.style.Fill({ color: blue }));
 * render.drawPolygon(
 *     new ol.geom.Polygon([[[0, 0], [100, 100], [100, 0], [0, 0]]]));
 * ```
 *
 * @param {CanvasRenderingContext2D} context Canvas context.
 * @param {olx.render.ToContextOptions=} opt_options Options.
 * @return {ol.render.canvas.Immediate} Canvas Immediate.
 * @api
 */
ol.render.toContext = function(context, opt_options) {
  var canvas = context.canvas;
  var options = opt_options ? opt_options : {};
  var pixelRatio = options.pixelRatio || ol.has.DEVICE_PIXEL_RATIO;
  var size = options.size;
  if (size) {
    canvas.width = size[0] * pixelRatio;
    canvas.height = size[1] * pixelRatio;
    canvas.style.width = size[0] + 'px';
    canvas.style.height = size[1] + 'px';
  }
  var extent = [0, 0, canvas.width, canvas.height];
  var transform = ol.transform.scale(ol.transform.create(), pixelRatio, pixelRatio);
  return new ol.render.canvas.Immediate(context, pixelRatio, extent, transform,
      0);
};

goog.provide('ol.reproj.Tile');

goog.require('ol');
goog.require('ol.Tile');
goog.require('ol.events');
goog.require('ol.events.EventType');
goog.require('ol.extent');
goog.require('ol.math');
goog.require('ol.obj');
goog.require('ol.reproj');
goog.require('ol.reproj.Triangulation');


/**
 * @classdesc
 * Class encapsulating single reprojected tile.
 * See {@link ol.source.TileImage}.
 *
 * @constructor
 * @extends {ol.Tile}
 * @param {ol.proj.Projection} sourceProj Source projection.
 * @param {ol.tilegrid.TileGrid} sourceTileGrid Source tile grid.
 * @param {ol.proj.Projection} targetProj Target projection.
 * @param {ol.tilegrid.TileGrid} targetTileGrid Target tile grid.
 * @param {ol.TileCoord} tileCoord Coordinate of the tile.
 * @param {ol.TileCoord} wrappedTileCoord Coordinate of the tile wrapped in X.
 * @param {number} pixelRatio Pixel ratio.
 * @param {number} gutter Gutter of the source tiles.
 * @param {ol.ReprojTileFunctionType} getTileFunction
 *     Function returning source tiles (z, x, y, pixelRatio).
 * @param {number=} opt_errorThreshold Acceptable reprojection error (in px).
 * @param {boolean=} opt_renderEdges Render reprojection edges.
 */
ol.reproj.Tile = function(sourceProj, sourceTileGrid,
    targetProj, targetTileGrid, tileCoord, wrappedTileCoord,
    pixelRatio, gutter, getTileFunction,
    opt_errorThreshold,
    opt_renderEdges) {
  ol.Tile.call(this, tileCoord, ol.Tile.State.IDLE);

  /**
   * @private
   * @type {boolean}
   */
  this.renderEdges_ = opt_renderEdges !== undefined ? opt_renderEdges : false;

  /**
   * @private
   * @type {number}
   */
  this.pixelRatio_ = pixelRatio;

  /**
   * @private
   * @type {number}
   */
  this.gutter_ = gutter;

  /**
   * @private
   * @type {HTMLCanvasElement}
   */
  this.canvas_ = null;

  /**
   * @private
   * @type {Object.<number, HTMLCanvasElement>}
   */
  this.canvasByContext_ = {};

  /**
   * @private
   * @type {ol.tilegrid.TileGrid}
   */
  this.sourceTileGrid_ = sourceTileGrid;

  /**
   * @private
   * @type {ol.tilegrid.TileGrid}
   */
  this.targetTileGrid_ = targetTileGrid;

  /**
   * @private
   * @type {ol.TileCoord}
   */
  this.wrappedTileCoord_ = wrappedTileCoord ? wrappedTileCoord : tileCoord;

  /**
   * @private
   * @type {!Array.<ol.Tile>}
   */
  this.sourceTiles_ = [];

  /**
   * @private
   * @type {Array.<ol.EventsKey>}
   */
  this.sourcesListenerKeys_ = null;

  /**
   * @private
   * @type {number}
   */
  this.sourceZ_ = 0;

  var targetExtent = targetTileGrid.getTileCoordExtent(this.wrappedTileCoord_);
  var maxTargetExtent = this.targetTileGrid_.getExtent();
  var maxSourceExtent = this.sourceTileGrid_.getExtent();

  var limitedTargetExtent = maxTargetExtent ?
      ol.extent.getIntersection(targetExtent, maxTargetExtent) : targetExtent;

  if (ol.extent.getArea(limitedTargetExtent) === 0) {
    // Tile is completely outside range -> EMPTY
    // TODO: is it actually correct that the source even creates the tile ?
    this.state = ol.Tile.State.EMPTY;
    return;
  }

  var sourceProjExtent = sourceProj.getExtent();
  if (sourceProjExtent) {
    if (!maxSourceExtent) {
      maxSourceExtent = sourceProjExtent;
    } else {
      maxSourceExtent = ol.extent.getIntersection(
          maxSourceExtent, sourceProjExtent);
    }
  }

  var targetResolution = targetTileGrid.getResolution(
      this.wrappedTileCoord_[0]);

  var targetCenter = ol.extent.getCenter(limitedTargetExtent);
  var sourceResolution = ol.reproj.calculateSourceResolution(
      sourceProj, targetProj, targetCenter, targetResolution);

  if (!isFinite(sourceResolution) || sourceResolution <= 0) {
    // invalid sourceResolution -> EMPTY
    // probably edges of the projections when no extent is defined
    this.state = ol.Tile.State.EMPTY;
    return;
  }

  var errorThresholdInPixels = opt_errorThreshold !== undefined ?
      opt_errorThreshold : ol.DEFAULT_RASTER_REPROJECTION_ERROR_THRESHOLD;

  /**
   * @private
   * @type {!ol.reproj.Triangulation}
   */
  this.triangulation_ = new ol.reproj.Triangulation(
      sourceProj, targetProj, limitedTargetExtent, maxSourceExtent,
      sourceResolution * errorThresholdInPixels);

  if (this.triangulation_.getTriangles().length === 0) {
    // no valid triangles -> EMPTY
    this.state = ol.Tile.State.EMPTY;
    return;
  }

  this.sourceZ_ = sourceTileGrid.getZForResolution(sourceResolution);
  var sourceExtent = this.triangulation_.calculateSourceExtent();

  if (maxSourceExtent) {
    if (sourceProj.canWrapX()) {
      sourceExtent[1] = ol.math.clamp(
          sourceExtent[1], maxSourceExtent[1], maxSourceExtent[3]);
      sourceExtent[3] = ol.math.clamp(
          sourceExtent[3], maxSourceExtent[1], maxSourceExtent[3]);
    } else {
      sourceExtent = ol.extent.getIntersection(sourceExtent, maxSourceExtent);
    }
  }

  if (!ol.extent.getArea(sourceExtent)) {
    this.state = ol.Tile.State.EMPTY;
  } else {
    var sourceRange = sourceTileGrid.getTileRangeForExtentAndZ(
        sourceExtent, this.sourceZ_);

    var tilesRequired = sourceRange.getWidth() * sourceRange.getHeight();
    if (goog.DEBUG && !(tilesRequired < ol.RASTER_REPROJECTION_MAX_SOURCE_TILES)) {
      console.assert(false, 'reasonable number of tiles is required');
      this.state = ol.Tile.State.ERROR;
      return;
    }
    for (var srcX = sourceRange.minX; srcX <= sourceRange.maxX; srcX++) {
      for (var srcY = sourceRange.minY; srcY <= sourceRange.maxY; srcY++) {
        var tile = getTileFunction(this.sourceZ_, srcX, srcY, pixelRatio);
        if (tile) {
          this.sourceTiles_.push(tile);
        }
      }
    }

    if (this.sourceTiles_.length === 0) {
      this.state = ol.Tile.State.EMPTY;
    }
  }
};
ol.inherits(ol.reproj.Tile, ol.Tile);


/**
 * @inheritDoc
 */
ol.reproj.Tile.prototype.disposeInternal = function() {
  if (this.state == ol.Tile.State.LOADING) {
    this.unlistenSources_();
  }
  ol.Tile.prototype.disposeInternal.call(this);
};


/**
 * @inheritDoc
 */
ol.reproj.Tile.prototype.getImage = function(opt_context) {
  if (opt_context !== undefined) {
    var image;
    var key = ol.getUid(opt_context);
    if (key in this.canvasByContext_) {
      return this.canvasByContext_[key];
    } else if (ol.obj.isEmpty(this.canvasByContext_)) {
      image = this.canvas_;
    } else {
      image = /** @type {HTMLCanvasElement} */ (this.canvas_.cloneNode(false));
    }
    this.canvasByContext_[key] = image;
    return image;
  } else {
    return this.canvas_;
  }
};


/**
 * @private
 */
ol.reproj.Tile.prototype.reproject_ = function() {
  var sources = [];
  this.sourceTiles_.forEach(function(tile, i, arr) {
    if (tile && tile.getState() == ol.Tile.State.LOADED) {
      sources.push({
        extent: this.sourceTileGrid_.getTileCoordExtent(tile.tileCoord),
        image: tile.getImage()
      });
    }
  }, this);
  this.sourceTiles_.length = 0;

  if (sources.length === 0) {
    this.state = ol.Tile.State.ERROR;
  } else {
    var z = this.wrappedTileCoord_[0];
    var size = this.targetTileGrid_.getTileSize(z);
    var width = typeof size === 'number' ? size : size[0];
    var height = typeof size === 'number' ? size : size[1];
    var targetResolution = this.targetTileGrid_.getResolution(z);
    var sourceResolution = this.sourceTileGrid_.getResolution(this.sourceZ_);

    var targetExtent = this.targetTileGrid_.getTileCoordExtent(
        this.wrappedTileCoord_);
    this.canvas_ = ol.reproj.render(width, height, this.pixelRatio_,
        sourceResolution, this.sourceTileGrid_.getExtent(),
        targetResolution, targetExtent, this.triangulation_, sources,
        this.gutter_, this.renderEdges_);

    this.state = ol.Tile.State.LOADED;
  }
  this.changed();
};


/**
 * @inheritDoc
 */
ol.reproj.Tile.prototype.load = function() {
  if (this.state == ol.Tile.State.IDLE) {
    this.state = ol.Tile.State.LOADING;
    this.changed();

    var leftToLoad = 0;

    goog.DEBUG && console.assert(!this.sourcesListenerKeys_,
        'this.sourcesListenerKeys_ should be null');

    this.sourcesListenerKeys_ = [];
    this.sourceTiles_.forEach(function(tile, i, arr) {
      var state = tile.getState();
      if (state == ol.Tile.State.IDLE || state == ol.Tile.State.LOADING) {
        leftToLoad++;

        var sourceListenKey;
        sourceListenKey = ol.events.listen(tile, ol.events.EventType.CHANGE,
            function(e) {
              var state = tile.getState();
              if (state == ol.Tile.State.LOADED ||
                  state == ol.Tile.State.ERROR ||
                  state == ol.Tile.State.EMPTY) {
                ol.events.unlistenByKey(sourceListenKey);
                leftToLoad--;
                goog.DEBUG && console.assert(leftToLoad >= 0,
                    'leftToLoad should not be negative');
                if (leftToLoad === 0) {
                  this.unlistenSources_();
                  this.reproject_();
                }
              }
            }, this);
        this.sourcesListenerKeys_.push(sourceListenKey);
      }
    }, this);

    this.sourceTiles_.forEach(function(tile, i, arr) {
      var state = tile.getState();
      if (state == ol.Tile.State.IDLE) {
        tile.load();
      }
    });

    if (leftToLoad === 0) {
      var global = ol.global;
      global.setTimeout(this.reproject_.bind(this), 0);
    }
  }
};


/**
 * @private
 */
ol.reproj.Tile.prototype.unlistenSources_ = function() {
  this.sourcesListenerKeys_.forEach(ol.events.unlistenByKey);
  this.sourcesListenerKeys_ = null;
};

goog.provide('ol.TileUrlFunction');

goog.require('ol.asserts');
goog.require('ol.math');
goog.require('ol.tilecoord');


/**
 * @param {string} template Template.
 * @param {ol.tilegrid.TileGrid} tileGrid Tile grid.
 * @return {ol.TileUrlFunctionType} Tile URL function.
 */
ol.TileUrlFunction.createFromTemplate = function(template, tileGrid) {
  var zRegEx = /\{z\}/g;
  var xRegEx = /\{x\}/g;
  var yRegEx = /\{y\}/g;
  var dashYRegEx = /\{-y\}/g;
  return (
      /**
       * @param {ol.TileCoord} tileCoord Tile Coordinate.
       * @param {number} pixelRatio Pixel ratio.
       * @param {ol.proj.Projection} projection Projection.
       * @return {string|undefined} Tile URL.
       */
      function(tileCoord, pixelRatio, projection) {
        if (!tileCoord) {
          return undefined;
        } else {
          return template.replace(zRegEx, tileCoord[0].toString())
              .replace(xRegEx, tileCoord[1].toString())
              .replace(yRegEx, function() {
                var y = -tileCoord[2] - 1;
                return y.toString();
              })
              .replace(dashYRegEx, function() {
                var z = tileCoord[0];
                var range = tileGrid.getFullTileRange(z);
                ol.asserts.assert(range, 55); // The {-y} placeholder requires a tile grid with extent
                var y = range.getHeight() + tileCoord[2];
                return y.toString();
              });
        }
      });
};


/**
 * @param {Array.<string>} templates Templates.
 * @param {ol.tilegrid.TileGrid} tileGrid Tile grid.
 * @return {ol.TileUrlFunctionType} Tile URL function.
 */
ol.TileUrlFunction.createFromTemplates = function(templates, tileGrid) {
  var len = templates.length;
  var tileUrlFunctions = new Array(len);
  for (var i = 0; i < len; ++i) {
    tileUrlFunctions[i] = ol.TileUrlFunction.createFromTemplate(
        templates[i], tileGrid);
  }
  return ol.TileUrlFunction.createFromTileUrlFunctions(tileUrlFunctions);
};


/**
 * @param {Array.<ol.TileUrlFunctionType>} tileUrlFunctions Tile URL Functions.
 * @return {ol.TileUrlFunctionType} Tile URL function.
 */
ol.TileUrlFunction.createFromTileUrlFunctions = function(tileUrlFunctions) {
  goog.DEBUG && console.assert(tileUrlFunctions.length > 0,
      'Length of tile url functions should be greater than 0');
  if (tileUrlFunctions.length === 1) {
    return tileUrlFunctions[0];
  }
  return (
      /**
       * @param {ol.TileCoord} tileCoord Tile Coordinate.
       * @param {number} pixelRatio Pixel ratio.
       * @param {ol.proj.Projection} projection Projection.
       * @return {string|undefined} Tile URL.
       */
      function(tileCoord, pixelRatio, projection) {
        if (!tileCoord) {
          return undefined;
        } else {
          var h = ol.tilecoord.hash(tileCoord);
          var index = ol.math.modulo(h, tileUrlFunctions.length);
          return tileUrlFunctions[index](tileCoord, pixelRatio, projection);
        }
      });
};


/**
 * @param {ol.TileCoord} tileCoord Tile coordinate.
 * @param {number} pixelRatio Pixel ratio.
 * @param {ol.proj.Projection} projection Projection.
 * @return {string|undefined} Tile URL.
 */
ol.TileUrlFunction.nullTileUrlFunction = function(tileCoord, pixelRatio, projection) {
  return undefined;
};


/**
 * @param {string} url URL.
 * @return {Array.<string>} Array of urls.
 */
ol.TileUrlFunction.expandUrl = function(url) {
  var urls = [];
  var match = /\{(\d)-(\d)\}/.exec(url) || /\{([a-z])-([a-z])\}/.exec(url);
  if (match) {
    var startCharCode = match[1].charCodeAt(0);
    var stopCharCode = match[2].charCodeAt(0);
    var charCode;
    for (charCode = startCharCode; charCode <= stopCharCode; ++charCode) {
      urls.push(url.replace(match[0], String.fromCharCode(charCode)));
    }
  } else {
    urls.push(url);
  }
  return urls;
};

goog.provide('ol.TileCache');

goog.require('ol');
goog.require('ol.structs.LRUCache');
goog.require('ol.tilecoord');


/**
 * @constructor
 * @extends {ol.structs.LRUCache.<ol.Tile>}
 * @param {number=} opt_highWaterMark High water mark.
 * @struct
 */
ol.TileCache = function(opt_highWaterMark) {

  ol.structs.LRUCache.call(this);

  /**
   * @private
   * @type {number}
   */
  this.highWaterMark_ = opt_highWaterMark !== undefined ? opt_highWaterMark : 2048;

};
ol.inherits(ol.TileCache, ol.structs.LRUCache);


/**
 * @return {boolean} Can expire cache.
 */
ol.TileCache.prototype.canExpireCache = function() {
  return this.getCount() > this.highWaterMark_;
};


/**
 * @param {Object.<string, ol.TileRange>} usedTiles Used tiles.
 */
ol.TileCache.prototype.expireCache = function(usedTiles) {
  var tile, zKey;
  while (this.canExpireCache()) {
    tile = this.peekLast();
    zKey = tile.tileCoord[0].toString();
    if (zKey in usedTiles && usedTiles[zKey].contains(tile.tileCoord)) {
      break;
    } else {
      this.pop().dispose();
    }
  }
};


/**
 * Remove a tile range from the cache, e.g. to invalidate tiles.
 * @param {ol.TileRange} tileRange The tile range to prune.
 */
ol.TileCache.prototype.pruneTileRange = function(tileRange) {
  var i = this.getCount(),
      key;
  while (i--) {
    key = this.peekLastKey();
    if (tileRange.contains(ol.tilecoord.createFromString(key))) {
      this.pop().dispose();
    } else {
      this.get(key);
    }
  }
};

goog.provide('ol.source.Tile');
goog.provide('ol.source.TileEvent');

goog.require('ol');
goog.require('ol.Tile');
goog.require('ol.TileCache');
goog.require('ol.events.Event');
goog.require('ol.proj');
goog.require('ol.size');
goog.require('ol.source.Source');
goog.require('ol.tilecoord');
goog.require('ol.tilegrid');


/**
 * @classdesc
 * Abstract base class; normally only used for creating subclasses and not
 * instantiated in apps.
 * Base class for sources providing images divided into a tile grid.
 *
 * @constructor
 * @extends {ol.source.Source}
 * @param {ol.SourceTileOptions} options Tile source options.
 * @api
 */
ol.source.Tile = function(options) {

  ol.source.Source.call(this, {
    attributions: options.attributions,
    extent: options.extent,
    logo: options.logo,
    projection: options.projection,
    state: options.state,
    wrapX: options.wrapX
  });

  /**
   * @private
   * @type {boolean}
   */
  this.opaque_ = options.opaque !== undefined ? options.opaque : false;

  /**
   * @private
   * @type {number}
   */
  this.tilePixelRatio_ = options.tilePixelRatio !== undefined ?
      options.tilePixelRatio : 1;

  /**
   * @protected
   * @type {ol.tilegrid.TileGrid}
   */
  this.tileGrid = options.tileGrid !== undefined ? options.tileGrid : null;

  /**
   * @protected
   * @type {ol.TileCache}
   */
  this.tileCache = new ol.TileCache(options.cacheSize);

  /**
   * @protected
   * @type {ol.Size}
   */
  this.tmpSize = [0, 0];

  /**
   * @private
   * @type {string}
   */
  this.key_ = '';

};
ol.inherits(ol.source.Tile, ol.source.Source);


/**
 * @return {boolean} Can expire cache.
 */
ol.source.Tile.prototype.canExpireCache = function() {
  return this.tileCache.canExpireCache();
};


/**
 * @param {ol.proj.Projection} projection Projection.
 * @param {Object.<string, ol.TileRange>} usedTiles Used tiles.
 */
ol.source.Tile.prototype.expireCache = function(projection, usedTiles) {
  var tileCache = this.getTileCacheForProjection(projection);
  if (tileCache) {
    tileCache.expireCache(usedTiles);
  }
};


/**
 * @param {ol.proj.Projection} projection Projection.
 * @param {number} z Zoom level.
 * @param {ol.TileRange} tileRange Tile range.
 * @param {function(ol.Tile):(boolean|undefined)} callback Called with each
 *     loaded tile.  If the callback returns `false`, the tile will not be
 *     considered loaded.
 * @return {boolean} The tile range is fully covered with loaded tiles.
 */
ol.source.Tile.prototype.forEachLoadedTile = function(projection, z, tileRange, callback) {
  var tileCache = this.getTileCacheForProjection(projection);
  if (!tileCache) {
    return false;
  }

  var covered = true;
  var tile, tileCoordKey, loaded;
  for (var x = tileRange.minX; x <= tileRange.maxX; ++x) {
    for (var y = tileRange.minY; y <= tileRange.maxY; ++y) {
      tileCoordKey = this.getKeyZXY(z, x, y);
      loaded = false;
      if (tileCache.containsKey(tileCoordKey)) {
        tile = /** @type {!ol.Tile} */ (tileCache.get(tileCoordKey));
        loaded = tile.getState() === ol.Tile.State.LOADED;
        if (loaded) {
          loaded = (callback(tile) !== false);
        }
      }
      if (!loaded) {
        covered = false;
      }
    }
  }
  return covered;
};


/**
 * @param {ol.proj.Projection} projection Projection.
 * @return {number} Gutter.
 */
ol.source.Tile.prototype.getGutter = function(projection) {
  return 0;
};


/**
 * Return the key to be used for all tiles in the source.
 * @return {string} The key for all tiles.
 * @protected
 */
ol.source.Tile.prototype.getKey = function() {
  return this.key_;
};


/**
 * Set the value to be used as the key for all tiles in the source.
 * @param {string} key The key for tiles.
 * @protected
 */
ol.source.Tile.prototype.setKey = function(key) {
  if (this.key_ !== key) {
    this.key_ = key;
    this.changed();
  }
};


/**
 * @param {number} z Z.
 * @param {number} x X.
 * @param {number} y Y.
 * @return {string} Key.
 * @protected
 */
ol.source.Tile.prototype.getKeyZXY = ol.tilecoord.getKeyZXY;


/**
 * @param {ol.proj.Projection} projection Projection.
 * @return {boolean} Opaque.
 */
ol.source.Tile.prototype.getOpaque = function(projection) {
  return this.opaque_;
};


/**
 * @inheritDoc
 */
ol.source.Tile.prototype.getResolutions = function() {
  return this.tileGrid.getResolutions();
};


/**
 * @abstract
 * @param {number} z Tile coordinate z.
 * @param {number} x Tile coordinate x.
 * @param {number} y Tile coordinate y.
 * @param {number} pixelRatio Pixel ratio.
 * @param {ol.proj.Projection} projection Projection.
 * @return {!ol.Tile} Tile.
 */
ol.source.Tile.prototype.getTile = function(z, x, y, pixelRatio, projection) {};


/**
 * Return the tile grid of the tile source.
 * @return {ol.tilegrid.TileGrid} Tile grid.
 * @api stable
 */
ol.source.Tile.prototype.getTileGrid = function() {
  return this.tileGrid;
};


/**
 * @param {ol.proj.Projection} projection Projection.
 * @return {!ol.tilegrid.TileGrid} Tile grid.
 */
ol.source.Tile.prototype.getTileGridForProjection = function(projection) {
  if (!this.tileGrid) {
    return ol.tilegrid.getForProjection(projection);
  } else {
    return this.tileGrid;
  }
};


/**
 * @param {ol.proj.Projection} projection Projection.
 * @return {ol.TileCache} Tile cache.
 * @protected
 */
ol.source.Tile.prototype.getTileCacheForProjection = function(projection) {
  var thisProj = this.getProjection();
  if (thisProj && !ol.proj.equivalent(thisProj, projection)) {
    return null;
  } else {
    return this.tileCache;
  }
};


/**
 * Get the tile pixel ratio for this source. Subclasses may override this
 * method, which is meant to return a supported pixel ratio that matches the
 * provided `opt_pixelRatio` as close as possible. When no `opt_pixelRatio` is
 * provided, it is meant to return `this.tilePixelRatio_`.
 * @param {number=} opt_pixelRatio Pixel ratio.
 * @return {number} Tile pixel ratio.
 */
ol.source.Tile.prototype.getTilePixelRatio = function(opt_pixelRatio) {
  return this.tilePixelRatio_;
};


/**
 * @param {number} z Z.
 * @param {number} pixelRatio Pixel ratio.
 * @param {ol.proj.Projection} projection Projection.
 * @return {ol.Size} Tile size.
 */
ol.source.Tile.prototype.getTilePixelSize = function(z, pixelRatio, projection) {
  var tileGrid = this.getTileGridForProjection(projection);
  var tilePixelRatio = this.getTilePixelRatio(pixelRatio);
  var tileSize = ol.size.toSize(tileGrid.getTileSize(z), this.tmpSize);
  if (tilePixelRatio == 1) {
    return tileSize;
  } else {
    return ol.size.scale(tileSize, tilePixelRatio, this.tmpSize);
  }
};


/**
 * Returns a tile coordinate wrapped around the x-axis. When the tile coordinate
 * is outside the resolution and extent range of the tile grid, `null` will be
 * returned.
 * @param {ol.TileCoord} tileCoord Tile coordinate.
 * @param {ol.proj.Projection=} opt_projection Projection.
 * @return {ol.TileCoord} Tile coordinate to be passed to the tileUrlFunction or
 *     null if no tile URL should be created for the passed `tileCoord`.
 */
ol.source.Tile.prototype.getTileCoordForTileUrlFunction = function(tileCoord, opt_projection) {
  var projection = opt_projection !== undefined ?
      opt_projection : this.getProjection();
  var tileGrid = this.getTileGridForProjection(projection);
  if (this.getWrapX() && projection.isGlobal()) {
    tileCoord = ol.tilegrid.wrapX(tileGrid, tileCoord, projection);
  }
  return ol.tilecoord.withinExtentAndZ(tileCoord, tileGrid) ? tileCoord : null;
};


/**
 * @inheritDoc
 */
ol.source.Tile.prototype.refresh = function() {
  this.tileCache.clear();
  this.changed();
};


/**
 * Marks a tile coord as being used, without triggering a load.
 * @param {number} z Tile coordinate z.
 * @param {number} x Tile coordinate x.
 * @param {number} y Tile coordinate y.
 * @param {ol.proj.Projection} projection Projection.
 */
ol.source.Tile.prototype.useTile = ol.nullFunction;


/**
 * @classdesc
 * Events emitted by {@link ol.source.Tile} instances are instances of this
 * type.
 *
 * @constructor
 * @extends {ol.events.Event}
 * @implements {oli.source.TileEvent}
 * @param {string} type Type.
 * @param {ol.Tile} tile The tile.
 */
ol.source.TileEvent = function(type, tile) {

  ol.events.Event.call(this, type);

  /**
   * The tile related to the event.
   * @type {ol.Tile}
   * @api
   */
  this.tile = tile;

};
ol.inherits(ol.source.TileEvent, ol.events.Event);


/**
 * @enum {string}
 */
ol.source.TileEventType = {

  /**
   * Triggered when a tile starts loading.
   * @event ol.source.TileEvent#tileloadstart
   * @api stable
   */
  TILELOADSTART: 'tileloadstart',

  /**
   * Triggered when a tile finishes loading.
   * @event ol.source.TileEvent#tileloadend
   * @api stable
   */
  TILELOADEND: 'tileloadend',

  /**
   * Triggered if tile loading results in an error.
   * @event ol.source.TileEvent#tileloaderror
   * @api stable
   */
  TILELOADERROR: 'tileloaderror'

};

goog.provide('ol.source.UrlTile');

goog.require('ol');
goog.require('ol.Tile');
goog.require('ol.TileUrlFunction');
goog.require('ol.source.Tile');
goog.require('ol.source.TileEvent');


/**
 * @classdesc
 * Base class for sources providing tiles divided into a tile grid over http.
 *
 * @constructor
 * @fires ol.source.TileEvent
 * @extends {ol.source.Tile}
 * @param {ol.SourceUrlTileOptions} options Image tile options.
 */
ol.source.UrlTile = function(options) {

  ol.source.Tile.call(this, {
    attributions: options.attributions,
    cacheSize: options.cacheSize,
    extent: options.extent,
    logo: options.logo,
    opaque: options.opaque,
    projection: options.projection,
    state: options.state,
    tileGrid: options.tileGrid,
    tilePixelRatio: options.tilePixelRatio,
    wrapX: options.wrapX
  });

  /**
   * @protected
   * @type {ol.TileLoadFunctionType}
   */
  this.tileLoadFunction = options.tileLoadFunction;

  /**
   * @protected
   * @type {ol.TileUrlFunctionType}
   */
  this.tileUrlFunction = this.fixedTileUrlFunction ?
      this.fixedTileUrlFunction.bind(this) :
      ol.TileUrlFunction.nullTileUrlFunction;

  /**
   * @protected
   * @type {!Array.<string>|null}
   */
  this.urls = null;

  if (options.urls) {
    this.setUrls(options.urls);
  } else if (options.url) {
    this.setUrl(options.url);
  }
  if (options.tileUrlFunction) {
    this.setTileUrlFunction(options.tileUrlFunction);
  }

};
ol.inherits(ol.source.UrlTile, ol.source.Tile);


/**
 * @type {ol.TileUrlFunctionType|undefined}
 * @protected
 */
ol.source.UrlTile.prototype.fixedTileUrlFunction;

/**
 * Return the tile load function of the source.
 * @return {ol.TileLoadFunctionType} TileLoadFunction
 * @api
 */
ol.source.UrlTile.prototype.getTileLoadFunction = function() {
  return this.tileLoadFunction;
};


/**
 * Return the tile URL function of the source.
 * @return {ol.TileUrlFunctionType} TileUrlFunction
 * @api
 */
ol.source.UrlTile.prototype.getTileUrlFunction = function() {
  return this.tileUrlFunction;
};


/**
 * Return the URLs used for this source.
 * When a tileUrlFunction is used instead of url or urls,
 * null will be returned.
 * @return {!Array.<string>|null} URLs.
 * @api
 */
ol.source.UrlTile.prototype.getUrls = function() {
  return this.urls;
};


/**
 * Handle tile change events.
 * @param {ol.events.Event} event Event.
 * @protected
 */
ol.source.UrlTile.prototype.handleTileChange = function(event) {
  var tile = /** @type {ol.Tile} */ (event.target);
  switch (tile.getState()) {
    case ol.Tile.State.LOADING:
      this.dispatchEvent(
          new ol.source.TileEvent(ol.source.TileEventType.TILELOADSTART, tile));
      break;
    case ol.Tile.State.LOADED:
      this.dispatchEvent(
          new ol.source.TileEvent(ol.source.TileEventType.TILELOADEND, tile));
      break;
    case ol.Tile.State.ERROR:
      this.dispatchEvent(
          new ol.source.TileEvent(ol.source.TileEventType.TILELOADERROR, tile));
      break;
    default:
      // pass
  }
};


/**
 * Set the tile load function of the source.
 * @param {ol.TileLoadFunctionType} tileLoadFunction Tile load function.
 * @api
 */
ol.source.UrlTile.prototype.setTileLoadFunction = function(tileLoadFunction) {
  this.tileCache.clear();
  this.tileLoadFunction = tileLoadFunction;
  this.changed();
};


/**
 * Set the tile URL function of the source.
 * @param {ol.TileUrlFunctionType} tileUrlFunction Tile URL function.
 * @param {string=} opt_key Optional new tile key for the source.
 * @api
 */
ol.source.UrlTile.prototype.setTileUrlFunction = function(tileUrlFunction, opt_key) {
  this.tileUrlFunction = tileUrlFunction;
  if (typeof opt_key !== 'undefined') {
    this.setKey(opt_key);
  } else {
    this.changed();
  }
};


/**
 * Set the URL to use for requests.
 * @param {string} url URL.
 * @api stable
 */
ol.source.UrlTile.prototype.setUrl = function(url) {
  var urls = this.urls = ol.TileUrlFunction.expandUrl(url);
  this.setTileUrlFunction(this.fixedTileUrlFunction ?
      this.fixedTileUrlFunction.bind(this) :
      ol.TileUrlFunction.createFromTemplates(urls, this.tileGrid), url);
};


/**
 * Set the URLs to use for requests.
 * @param {Array.<string>} urls URLs.
 * @api stable
 */
ol.source.UrlTile.prototype.setUrls = function(urls) {
  this.urls = urls;
  var key = urls.join('\n');
  this.setTileUrlFunction(this.fixedTileUrlFunction ?
      this.fixedTileUrlFunction.bind(this) :
      ol.TileUrlFunction.createFromTemplates(urls, this.tileGrid), key);
};


/**
 * @inheritDoc
 */
ol.source.UrlTile.prototype.useTile = function(z, x, y) {
  var tileCoordKey = this.getKeyZXY(z, x, y);
  if (this.tileCache.containsKey(tileCoordKey)) {
    this.tileCache.get(tileCoordKey);
  }
};

goog.provide('ol.source.TileImage');

goog.require('ol');
goog.require('ol.ImageTile');
goog.require('ol.Tile');
goog.require('ol.TileCache');
goog.require('ol.events');
goog.require('ol.events.EventType');
goog.require('ol.proj');
goog.require('ol.reproj.Tile');
goog.require('ol.source.UrlTile');
goog.require('ol.tilegrid');


/**
 * @classdesc
 * Base class for sources providing images divided into a tile grid.
 *
 * @constructor
 * @fires ol.source.TileEvent
 * @extends {ol.source.UrlTile}
 * @param {olx.source.TileImageOptions} options Image tile options.
 * @api
 */
ol.source.TileImage = function(options) {

  ol.source.UrlTile.call(this, {
    attributions: options.attributions,
    cacheSize: options.cacheSize,
    extent: options.extent,
    logo: options.logo,
    opaque: options.opaque,
    projection: options.projection,
    state: options.state,
    tileGrid: options.tileGrid,
    tileLoadFunction: options.tileLoadFunction ?
        options.tileLoadFunction : ol.source.TileImage.defaultTileLoadFunction,
    tilePixelRatio: options.tilePixelRatio,
    tileUrlFunction: options.tileUrlFunction,
    url: options.url,
    urls: options.urls,
    wrapX: options.wrapX
  });

  /**
   * @protected
   * @type {?string}
   */
  this.crossOrigin =
      options.crossOrigin !== undefined ? options.crossOrigin : null;

  /**
   * @protected
   * @type {function(new: ol.ImageTile, ol.TileCoord, ol.Tile.State, string,
   *        ?string, ol.TileLoadFunctionType)}
   */
  this.tileClass = options.tileClass !== undefined ?
      options.tileClass : ol.ImageTile;

  /**
   * @protected
   * @type {Object.<string, ol.TileCache>}
   */
  this.tileCacheForProjection = {};

  /**
   * @protected
   * @type {Object.<string, ol.tilegrid.TileGrid>}
   */
  this.tileGridForProjection = {};

  /**
   * @private
   * @type {number|undefined}
   */
  this.reprojectionErrorThreshold_ = options.reprojectionErrorThreshold;

  /**
   * @private
   * @type {boolean}
   */
  this.renderReprojectionEdges_ = false;
};
ol.inherits(ol.source.TileImage, ol.source.UrlTile);


/**
 * @inheritDoc
 */
ol.source.TileImage.prototype.canExpireCache = function() {
  if (!ol.ENABLE_RASTER_REPROJECTION) {
    return ol.source.UrlTile.prototype.canExpireCache.call(this);
  }
  if (this.tileCache.canExpireCache()) {
    return true;
  } else {
    for (var key in this.tileCacheForProjection) {
      if (this.tileCacheForProjection[key].canExpireCache()) {
        return true;
      }
    }
  }
  return false;
};


/**
 * @inheritDoc
 */
ol.source.TileImage.prototype.expireCache = function(projection, usedTiles) {
  if (!ol.ENABLE_RASTER_REPROJECTION) {
    ol.source.UrlTile.prototype.expireCache.call(this, projection, usedTiles);
    return;
  }
  var usedTileCache = this.getTileCacheForProjection(projection);

  this.tileCache.expireCache(this.tileCache == usedTileCache ? usedTiles : {});
  for (var id in this.tileCacheForProjection) {
    var tileCache = this.tileCacheForProjection[id];
    tileCache.expireCache(tileCache == usedTileCache ? usedTiles : {});
  }
};


/**
 * @inheritDoc
 */
ol.source.TileImage.prototype.getGutter = function(projection) {
  if (ol.ENABLE_RASTER_REPROJECTION &&
      this.getProjection() && projection &&
      !ol.proj.equivalent(this.getProjection(), projection)) {
    return 0;
  } else {
    return this.getGutterInternal();
  }
};


/**
 * @protected
 * @return {number} Gutter.
 */
ol.source.TileImage.prototype.getGutterInternal = function() {
  return 0;
};


/**
 * @inheritDoc
 */
ol.source.TileImage.prototype.getOpaque = function(projection) {
  if (ol.ENABLE_RASTER_REPROJECTION &&
      this.getProjection() && projection &&
      !ol.proj.equivalent(this.getProjection(), projection)) {
    return false;
  } else {
    return ol.source.UrlTile.prototype.getOpaque.call(this, projection);
  }
};


/**
 * @inheritDoc
 */
ol.source.TileImage.prototype.getTileGridForProjection = function(projection) {
  if (!ol.ENABLE_RASTER_REPROJECTION) {
    return ol.source.UrlTile.prototype.getTileGridForProjection.call(this, projection);
  }
  var thisProj = this.getProjection();
  if (this.tileGrid &&
      (!thisProj || ol.proj.equivalent(thisProj, projection))) {
    return this.tileGrid;
  } else {
    var projKey = ol.getUid(projection).toString();
    if (!(projKey in this.tileGridForProjection)) {
      this.tileGridForProjection[projKey] =
          ol.tilegrid.getForProjection(projection);
    }
    return /** @type {!ol.tilegrid.TileGrid} */ (this.tileGridForProjection[projKey]);
  }
};


/**
 * @inheritDoc
 */
ol.source.TileImage.prototype.getTileCacheForProjection = function(projection) {
  if (!ol.ENABLE_RASTER_REPROJECTION) {
    return ol.source.UrlTile.prototype.getTileCacheForProjection.call(this, projection);
  }
  var thisProj = this.getProjection();
  if (!thisProj || ol.proj.equivalent(thisProj, projection)) {
    return this.tileCache;
  } else {
    var projKey = ol.getUid(projection).toString();
    if (!(projKey in this.tileCacheForProjection)) {
      this.tileCacheForProjection[projKey] = new ol.TileCache();
    }
    return this.tileCacheForProjection[projKey];
  }
};


/**
 * @param {number} z Tile coordinate z.
 * @param {number} x Tile coordinate x.
 * @param {number} y Tile coordinate y.
 * @param {number} pixelRatio Pixel ratio.
 * @param {ol.proj.Projection} projection Projection.
 * @param {string} key The key set on the tile.
 * @return {!ol.Tile} Tile.
 * @private
 */
ol.source.TileImage.prototype.createTile_ = function(z, x, y, pixelRatio, projection, key) {
  var tileCoord = [z, x, y];
  var urlTileCoord = this.getTileCoordForTileUrlFunction(
      tileCoord, projection);
  var tileUrl = urlTileCoord ?
      this.tileUrlFunction(urlTileCoord, pixelRatio, projection) : undefined;
  var tile = new this.tileClass(
      tileCoord,
      tileUrl !== undefined ? ol.Tile.State.IDLE : ol.Tile.State.EMPTY,
      tileUrl !== undefined ? tileUrl : '',
      this.crossOrigin,
      this.tileLoadFunction);
  tile.key = key;
  ol.events.listen(tile, ol.events.EventType.CHANGE,
      this.handleTileChange, this);
  return tile;
};


/**
 * @inheritDoc
 */
ol.source.TileImage.prototype.getTile = function(z, x, y, pixelRatio, projection) {
  if (!ol.ENABLE_RASTER_REPROJECTION ||
      !this.getProjection() ||
      !projection ||
      ol.proj.equivalent(this.getProjection(), projection)) {
    return this.getTileInternal(z, x, y, pixelRatio, /** @type {!ol.proj.Projection} */ (projection));
  } else {
    var cache = this.getTileCacheForProjection(projection);
    var tileCoord = [z, x, y];
    var tile;
    var tileCoordKey = this.getKeyZXY.apply(this, tileCoord);
    if (cache.containsKey(tileCoordKey)) {
      tile = /** @type {!ol.Tile} */ (cache.get(tileCoordKey));
    }
    var key = this.getKey();
    if (tile && tile.key == key) {
      return tile;
    } else {
      var sourceProjection = /** @type {!ol.proj.Projection} */ (this.getProjection());
      var sourceTileGrid = this.getTileGridForProjection(sourceProjection);
      var targetTileGrid = this.getTileGridForProjection(projection);
      var wrappedTileCoord =
          this.getTileCoordForTileUrlFunction(tileCoord, projection);
      var newTile = new ol.reproj.Tile(
          sourceProjection, sourceTileGrid,
          projection, targetTileGrid,
          tileCoord, wrappedTileCoord, this.getTilePixelRatio(pixelRatio),
          this.getGutterInternal(),
          function(z, x, y, pixelRatio) {
            return this.getTileInternal(z, x, y, pixelRatio, sourceProjection);
          }.bind(this), this.reprojectionErrorThreshold_,
          this.renderReprojectionEdges_);
      newTile.key = key;

      if (tile) {
        newTile.interimTile = tile;
        cache.replace(tileCoordKey, newTile);
      } else {
        cache.set(tileCoordKey, newTile);
      }
      return newTile;
    }
  }
};


/**
 * @param {number} z Tile coordinate z.
 * @param {number} x Tile coordinate x.
 * @param {number} y Tile coordinate y.
 * @param {number} pixelRatio Pixel ratio.
 * @param {!ol.proj.Projection} projection Projection.
 * @return {!ol.Tile} Tile.
 * @protected
 */
ol.source.TileImage.prototype.getTileInternal = function(z, x, y, pixelRatio, projection) {
  var tile = null;
  var tileCoordKey = this.getKeyZXY(z, x, y);
  var key = this.getKey();
  if (!this.tileCache.containsKey(tileCoordKey)) {
    tile = this.createTile_(z, x, y, pixelRatio, projection, key);
    this.tileCache.set(tileCoordKey, tile);
  } else {
    tile = /** @type {!ol.Tile} */ (this.tileCache.get(tileCoordKey));
    if (tile.key != key) {
      // The source's params changed. If the tile has an interim tile and if we
      // can use it then we use it. Otherwise we create a new tile.  In both
      // cases we attempt to assign an interim tile to the new tile.
      var /** @type {ol.Tile} */ interimTile = tile;
      if (tile.interimTile && tile.interimTile.key == key) {
        goog.DEBUG && console.assert(tile.interimTile.getState() == ol.Tile.State.LOADED);
        goog.DEBUG && console.assert(tile.interimTile.interimTile === null);
        tile = tile.interimTile;
        if (interimTile.getState() == ol.Tile.State.LOADED) {
          tile.interimTile = interimTile;
        }
      } else {
        tile = this.createTile_(z, x, y, pixelRatio, projection, key);
        if (interimTile.getState() == ol.Tile.State.LOADED) {
          tile.interimTile = interimTile;
        } else if (interimTile.interimTile &&
            interimTile.interimTile.getState() == ol.Tile.State.LOADED) {
          tile.interimTile = interimTile.interimTile;
          interimTile.interimTile = null;
        }
      }
      if (tile.interimTile) {
        tile.interimTile.interimTile = null;
      }
      this.tileCache.replace(tileCoordKey, tile);
    }
  }
  return tile;
};


/**
 * Sets whether to render reprojection edges or not (usually for debugging).
 * @param {boolean} render Render the edges.
 * @api
 */
ol.source.TileImage.prototype.setRenderReprojectionEdges = function(render) {
  if (!ol.ENABLE_RASTER_REPROJECTION ||
      this.renderReprojectionEdges_ == render) {
    return;
  }
  this.renderReprojectionEdges_ = render;
  for (var id in this.tileCacheForProjection) {
    this.tileCacheForProjection[id].clear();
  }
  this.changed();
};


/**
 * Sets the tile grid to use when reprojecting the tiles to the given
 * projection instead of the default tile grid for the projection.
 *
 * This can be useful when the default tile grid cannot be created
 * (e.g. projection has no extent defined) or
 * for optimization reasons (custom tile size, resolutions, ...).
 *
 * @param {ol.ProjectionLike} projection Projection.
 * @param {ol.tilegrid.TileGrid} tilegrid Tile grid to use for the projection.
 * @api
 */
ol.source.TileImage.prototype.setTileGridForProjection = function(projection, tilegrid) {
  if (ol.ENABLE_RASTER_REPROJECTION) {
    var proj = ol.proj.get(projection);
    if (proj) {
      var projKey = ol.getUid(proj).toString();
      if (!(projKey in this.tileGridForProjection)) {
        this.tileGridForProjection[projKey] = tilegrid;
      }
    }
  }
};


/**
 * @param {ol.ImageTile} imageTile Image tile.
 * @param {string} src Source.
 */
ol.source.TileImage.defaultTileLoadFunction = function(imageTile, src) {
  imageTile.getImage().src = src;
};

goog.provide('ol.source.BingMaps');

goog.require('ol');
goog.require('ol.Attribution');
goog.require('ol.TileUrlFunction');
goog.require('ol.extent');
goog.require('ol.net');
goog.require('ol.proj');
goog.require('ol.source.State');
goog.require('ol.source.TileImage');
goog.require('ol.tilecoord');
goog.require('ol.tilegrid');


/**
 * @classdesc
 * Layer source for Bing Maps tile data.
 *
 * @constructor
 * @extends {ol.source.TileImage}
 * @param {olx.source.BingMapsOptions} options Bing Maps options.
 * @api stable
 */
ol.source.BingMaps = function(options) {

  ol.source.TileImage.call(this, {
    cacheSize: options.cacheSize,
    crossOrigin: 'anonymous',
    opaque: true,
    projection: ol.proj.get('EPSG:3857'),
    reprojectionErrorThreshold: options.reprojectionErrorThreshold,
    state: ol.source.State.LOADING,
    tileLoadFunction: options.tileLoadFunction,
    wrapX: options.wrapX !== undefined ? options.wrapX : true
  });

  /**
   * @private
   * @type {string}
   */
  this.culture_ = options.culture !== undefined ? options.culture : 'en-us';

  /**
   * @private
   * @type {number}
   */
  this.maxZoom_ = options.maxZoom !== undefined ? options.maxZoom : -1;

  var url = 'https://dev.virtualearth.net/REST/v1/Imagery/Metadata/' +
      options.imagerySet +
      '?uriScheme=https&include=ImageryProviders&key=' + options.key;

  ol.net.jsonp(url, this.handleImageryMetadataResponse.bind(this), undefined,
      'jsonp');

};
ol.inherits(ol.source.BingMaps, ol.source.TileImage);


/**
 * The attribution containing a link to the Microsoft® Bing™ Maps Platform APIs’
 * Terms Of Use.
 * @const
 * @type {ol.Attribution}
 * @api
 */
ol.source.BingMaps.TOS_ATTRIBUTION = new ol.Attribution({
  html: '<a class="ol-attribution-bing-tos" ' +
      'href="http://www.microsoft.com/maps/product/terms.html">' +
      'Terms of Use</a>'
});


/**
 * @param {BingMapsImageryMetadataResponse} response Response.
 */
ol.source.BingMaps.prototype.handleImageryMetadataResponse = function(response) {

  if (response.statusCode != 200 ||
      response.statusDescription != 'OK' ||
      response.authenticationResultCode != 'ValidCredentials' ||
      response.resourceSets.length != 1 ||
      response.resourceSets[0].resources.length != 1) {
    this.setState(ol.source.State.ERROR);
    return;
  }

  var brandLogoUri = response.brandLogoUri;
  if (brandLogoUri.indexOf('https') == -1) {
    brandLogoUri = brandLogoUri.replace('http', 'https');
  }
  //var copyright = response.copyright;  // FIXME do we need to display this?
  var resource = response.resourceSets[0].resources[0];
  goog.DEBUG && console.assert(resource.imageWidth == resource.imageHeight,
      'resource has imageWidth equal to imageHeight, i.e. is square');
  var maxZoom = this.maxZoom_ == -1 ? resource.zoomMax : this.maxZoom_;

  var sourceProjection = this.getProjection();
  var extent = ol.tilegrid.extentFromProjection(sourceProjection);
  var tileSize = resource.imageWidth == resource.imageHeight ?
      resource.imageWidth : [resource.imageWidth, resource.imageHeight];
  var tileGrid = ol.tilegrid.createXYZ({
    extent: extent,
    minZoom: resource.zoomMin,
    maxZoom: maxZoom,
    tileSize: tileSize
  });
  this.tileGrid = tileGrid;

  var culture = this.culture_;
  this.tileUrlFunction = ol.TileUrlFunction.createFromTileUrlFunctions(
      resource.imageUrlSubdomains.map(function(subdomain) {
        var quadKeyTileCoord = [0, 0, 0];
        var imageUrl = resource.imageUrl
            .replace('{subdomain}', subdomain)
            .replace('{culture}', culture);
        return (
            /**
             * @param {ol.TileCoord} tileCoord Tile coordinate.
             * @param {number} pixelRatio Pixel ratio.
             * @param {ol.proj.Projection} projection Projection.
             * @return {string|undefined} Tile URL.
             */
            function(tileCoord, pixelRatio, projection) {
              goog.DEBUG && console.assert(ol.proj.equivalent(
                  projection, sourceProjection),
                  'projections are equivalent');
              if (!tileCoord) {
                return undefined;
              } else {
                ol.tilecoord.createOrUpdate(tileCoord[0], tileCoord[1],
                    -tileCoord[2] - 1, quadKeyTileCoord);
                return imageUrl.replace('{quadkey}', ol.tilecoord.quadKey(
                    quadKeyTileCoord));
              }
            });
      }));

  if (resource.imageryProviders) {
    var transform = ol.proj.getTransformFromProjections(
        ol.proj.get('EPSG:4326'), this.getProjection());

    var attributions = resource.imageryProviders.map(function(imageryProvider) {
      var html = imageryProvider.attribution;
      /** @type {Object.<string, Array.<ol.TileRange>>} */
      var tileRanges = {};
      imageryProvider.coverageAreas.forEach(function(coverageArea) {
        var minZ = coverageArea.zoomMin;
        var maxZ = Math.min(coverageArea.zoomMax, maxZoom);
        var bbox = coverageArea.bbox;
        var epsg4326Extent = [bbox[1], bbox[0], bbox[3], bbox[2]];
        var extent = ol.extent.applyTransform(epsg4326Extent, transform);
        var tileRange, z, zKey;
        for (z = minZ; z <= maxZ; ++z) {
          zKey = z.toString();
          tileRange = tileGrid.getTileRangeForExtentAndZ(extent, z);
          if (zKey in tileRanges) {
            tileRanges[zKey].push(tileRange);
          } else {
            tileRanges[zKey] = [tileRange];
          }
        }
      });
      return new ol.Attribution({html: html, tileRanges: tileRanges});
    });
    attributions.push(ol.source.BingMaps.TOS_ATTRIBUTION);
    this.setAttributions(attributions);
  }

  this.setLogo(brandLogoUri);

  this.setState(ol.source.State.READY);

};

goog.provide('ol.source.XYZ');

goog.require('ol');
goog.require('ol.source.TileImage');
goog.require('ol.tilegrid');


/**
 * @classdesc
 * Layer source for tile data with URLs in a set XYZ format that are
 * defined in a URL template. By default, this follows the widely-used
 * Google grid where `x` 0 and `y` 0 are in the top left. Grids like
 * TMS where `x` 0 and `y` 0 are in the bottom left can be used by
 * using the `{-y}` placeholder in the URL template, so long as the
 * source does not have a custom tile grid. In this case,
 * {@link ol.source.TileImage} can be used with a `tileUrlFunction`
 * such as:
 *
 *  tileUrlFunction: function(coordinate) {
 *    return 'http://mapserver.com/' + coordinate[0] + '/' +
 *        coordinate[1] + '/' + coordinate[2] + '.png';
 *    }
 *
 *
 * @constructor
 * @extends {ol.source.TileImage}
 * @param {olx.source.XYZOptions=} opt_options XYZ options.
 * @api stable
 */
ol.source.XYZ = function(opt_options) {
  var options = opt_options || {};
  var projection = options.projection !== undefined ?
      options.projection : 'EPSG:3857';

  var tileGrid = options.tileGrid !== undefined ? options.tileGrid :
      ol.tilegrid.createXYZ({
        extent: ol.tilegrid.extentFromProjection(projection),
        maxZoom: options.maxZoom,
        minZoom: options.minZoom,
        tileSize: options.tileSize
      });

  ol.source.TileImage.call(this, {
    attributions: options.attributions,
    cacheSize: options.cacheSize,
    crossOrigin: options.crossOrigin,
    logo: options.logo,
    opaque: options.opaque,
    projection: projection,
    reprojectionErrorThreshold: options.reprojectionErrorThreshold,
    tileGrid: tileGrid,
    tileLoadFunction: options.tileLoadFunction,
    tilePixelRatio: options.tilePixelRatio,
    tileUrlFunction: options.tileUrlFunction,
    url: options.url,
    urls: options.urls,
    wrapX: options.wrapX !== undefined ? options.wrapX : true
  });

};
ol.inherits(ol.source.XYZ, ol.source.TileImage);

goog.provide('ol.source.CartoDB');

goog.require('ol');
goog.require('ol.obj');
goog.require('ol.source.State');
goog.require('ol.source.XYZ');


/**
 * @classdesc
 * Layer source for the CartoDB tiles.
 *
 * @constructor
 * @extends {ol.source.XYZ}
 * @param {olx.source.CartoDBOptions} options CartoDB options.
 * @api
 */
ol.source.CartoDB = function(options) {

  /**
   * @type {string}
   * @private
   */
  this.account_ = options.account;

  /**
   * @type {string}
   * @private
   */
  this.mapId_ = options.map || '';

  /**
   * @type {!Object}
   * @private
   */
  this.config_ = options.config || {};

  /**
   * @type {!Object.<string, CartoDBLayerInfo>}
   * @private
   */
  this.templateCache_ = {};

  ol.source.XYZ.call(this, {
    attributions: options.attributions,
    cacheSize: options.cacheSize,
    crossOrigin: options.crossOrigin,
    logo: options.logo,
    maxZoom: options.maxZoom !== undefined ? options.maxZoom : 18,
    minZoom: options.minZoom,
    projection: options.projection,
    state: ol.source.State.LOADING,
    wrapX: options.wrapX
  });
  this.initializeMap_();
};
ol.inherits(ol.source.CartoDB, ol.source.XYZ);


/**
 * Returns the current config.
 * @return {!Object} The current configuration.
 * @api
 */
ol.source.CartoDB.prototype.getConfig = function() {
  return this.config_;
};


/**
 * Updates the carto db config.
 * @param {Object} config a key-value lookup. Values will replace current values
 *     in the config.
 * @api
 */
ol.source.CartoDB.prototype.updateConfig = function(config) {
  ol.obj.assign(this.config_, config);
  this.initializeMap_();
};


/**
 * Sets the CartoDB config
 * @param {Object} config In the case of anonymous maps, a CartoDB configuration
 *     object.
 * If using named maps, a key-value lookup with the template parameters.
 * @api
 */
ol.source.CartoDB.prototype.setConfig = function(config) {
  this.config_ = config || {};
  this.initializeMap_();
};


/**
 * Issue a request to initialize the CartoDB map.
 * @private
 */
ol.source.CartoDB.prototype.initializeMap_ = function() {
  var paramHash = JSON.stringify(this.config_);
  if (this.templateCache_[paramHash]) {
    this.applyTemplate_(this.templateCache_[paramHash]);
    return;
  }
  var mapUrl = 'https://' + this.account_ + '.cartodb.com/api/v1/map';

  if (this.mapId_) {
    mapUrl += '/named/' + this.mapId_;
  }

  var client = new XMLHttpRequest();
  client.addEventListener('load', this.handleInitResponse_.bind(this, paramHash));
  client.addEventListener('error', this.handleInitError_.bind(this));
  client.open('POST', mapUrl);
  client.setRequestHeader('Content-type', 'application/json');
  client.send(JSON.stringify(this.config_));
};


/**
 * Handle map initialization response.
 * @param {string} paramHash a hash representing the parameter set that was used
 *     for the request
 * @param {Event} event Event.
 * @private
 */
ol.source.CartoDB.prototype.handleInitResponse_ = function(paramHash, event) {
  var client = /** @type {XMLHttpRequest} */ (event.target);
  // status will be 0 for file:// urls
  if (!client.status || client.status >= 200 && client.status < 300) {
    var response;
    try {
      response = /** @type {CartoDBLayerInfo} */(JSON.parse(client.responseText));
    } catch (err) {
      this.setState(ol.source.State.ERROR);
      return;
    }
    this.applyTemplate_(response);
    this.templateCache_[paramHash] = response;
    this.setState(ol.source.State.READY);
  } else {
    this.setState(ol.source.State.ERROR);
  }
};


/**
 * @private
 * @param {Event} event Event.
 */
ol.source.CartoDB.prototype.handleInitError_ = function(event) {
  this.setState(ol.source.State.ERROR);
};


/**
 * Apply the new tile urls returned by carto db
 * @param {CartoDBLayerInfo} data Result of carto db call.
 * @private
 */
ol.source.CartoDB.prototype.applyTemplate_ = function(data) {
  var tilesUrl = 'https://' + data.cdn_url.https + '/' + this.account_ +
      '/api/v1/map/' + data.layergroupid + '/{z}/{x}/{y}.png';
  this.setUrl(tilesUrl);
};

// FIXME keep cluster cache by resolution ?
// FIXME distance not respected because of the centroid

goog.provide('ol.source.Cluster');

goog.require('ol');
goog.require('ol.asserts');
goog.require('ol.Feature');
goog.require('ol.coordinate');
goog.require('ol.events.EventType');
goog.require('ol.extent');
goog.require('ol.geom.Point');
goog.require('ol.source.Vector');


/**
 * @classdesc
 * Layer source to cluster vector data. Works out of the box with point
 * geometries. For other geometry types, or if not all geometries should be
 * considered for clustering, a custom `geometryFunction` can be defined.
 *
 * @constructor
 * @param {olx.source.ClusterOptions} options Constructor options.
 * @extends {ol.source.Vector}
 * @api
 */
ol.source.Cluster = function(options) {
  ol.source.Vector.call(this, {
    attributions: options.attributions,
    extent: options.extent,
    logo: options.logo,
    projection: options.projection,
    wrapX: options.wrapX
  });

  /**
   * @type {number|undefined}
   * @private
   */
  this.resolution_ = undefined;

  /**
   * @type {number}
   * @private
   */
  this.distance_ = options.distance !== undefined ? options.distance : 20;

  /**
   * @type {Array.<ol.Feature>}
   * @private
   */
  this.features_ = [];

  /**
   * @param {ol.Feature} feature Feature.
   * @return {ol.geom.Point} Cluster calculation point.
   */
  this.geometryFunction_ = options.geometryFunction || function(feature) {
    var geometry = /** @type {ol.geom.Point} */ (feature.getGeometry());
    ol.asserts.assert(geometry instanceof ol.geom.Point,
        10); // The default `geometryFunction` can only handle `ol.geom.Point` geometries
    return geometry;
  };

  /**
   * @type {ol.source.Vector}
   * @private
   */
  this.source_ = options.source;

  this.source_.on(ol.events.EventType.CHANGE,
      ol.source.Cluster.prototype.refresh_, this);
};
ol.inherits(ol.source.Cluster, ol.source.Vector);


/**
 * Get a reference to the wrapped source.
 * @return {ol.source.Vector} Source.
 * @api
 */
ol.source.Cluster.prototype.getSource = function() {
  return this.source_;
};


/**
 * @inheritDoc
 */
ol.source.Cluster.prototype.loadFeatures = function(extent, resolution,
    projection) {
  this.source_.loadFeatures(extent, resolution, projection);
  if (resolution !== this.resolution_) {
    this.clear();
    this.resolution_ = resolution;
    this.cluster_();
    this.addFeatures(this.features_);
  }
};


/**
 * Set the distance in pixels between clusters.
 * @param {number} distance The distance in pixels.
 * @api
 */
ol.source.Cluster.prototype.setDistance = function(distance) {
  this.distance_ = distance;
  this.refresh_();
};


/**
 * handle the source changing
 * @private
 */
ol.source.Cluster.prototype.refresh_ = function() {
  this.clear();
  this.cluster_();
  this.addFeatures(this.features_);
  this.changed();
};


/**
 * @private
 */
ol.source.Cluster.prototype.cluster_ = function() {
  if (this.resolution_ === undefined) {
    return;
  }
  this.features_.length = 0;
  var extent = ol.extent.createEmpty();
  var mapDistance = this.distance_ * this.resolution_;
  var features = this.source_.getFeatures();

  /**
   * @type {!Object.<string, boolean>}
   */
  var clustered = {};

  for (var i = 0, ii = features.length; i < ii; i++) {
    var feature = features[i];
    if (!(ol.getUid(feature).toString() in clustered)) {
      var geometry = this.geometryFunction_(feature);
      if (geometry) {
        var coordinates = geometry.getCoordinates();
        ol.extent.createOrUpdateFromCoordinate(coordinates, extent);
        ol.extent.buffer(extent, mapDistance, extent);

        var neighbors = this.source_.getFeaturesInExtent(extent);
        goog.DEBUG && console.assert(neighbors.length >= 1, 'at least one neighbor found');
        neighbors = neighbors.filter(function(neighbor) {
          var uid = ol.getUid(neighbor).toString();
          if (!(uid in clustered)) {
            clustered[uid] = true;
            return true;
          } else {
            return false;
          }
        });
        this.features_.push(this.createCluster_(neighbors));
      }
    }
  }
  goog.DEBUG && console.assert(
      Object.keys(clustered).length == this.source_.getFeatures().length,
      'number of clustered equals number of features in the source');
};


/**
 * @param {Array.<ol.Feature>} features Features
 * @return {ol.Feature} The cluster feature.
 * @private
 */
ol.source.Cluster.prototype.createCluster_ = function(features) {
  var centroid = [0, 0];
  for (var i = features.length - 1; i >= 0; --i) {
    var geometry = this.geometryFunction_(features[i]);
    if (geometry) {
      ol.coordinate.add(centroid, geometry.getCoordinates());
    } else {
      features.splice(i, 1);
    }
  }
  ol.coordinate.scale(centroid, 1 / features.length);

  var cluster = new ol.Feature(new ol.geom.Point(centroid));
  cluster.set('features', features);
  return cluster;
};

goog.provide('ol.uri');


/**
 * Appends query parameters to a URI.
 *
 * @param {string} uri The original URI, which may already have query data.
 * @param {!Object} params An object where keys are URI-encoded parameter keys,
 *     and the values are arbitrary types or arrays.
 * @return {string} The new URI.
 */
ol.uri.appendParams = function(uri, params) {
  var keyParams = [];
  // Skip any null or undefined parameter values
  Object.keys(params).forEach(function(k) {
    if (params[k] !== null && params[k] !== undefined) {
      keyParams.push(k + '=' + encodeURIComponent(params[k]));
    }
  });
  var qs = keyParams.join('&');
  // remove any trailing ? or &
  uri = uri.replace(/[?&]$/, '');
  // append ? or & depending on whether uri has existing parameters
  uri = uri.indexOf('?') === -1 ? uri + '?' : uri + '&';
  return uri + qs;
};

goog.provide('ol.source.ImageArcGISRest');

goog.require('ol');
goog.require('ol.Image');
goog.require('ol.asserts');
goog.require('ol.events');
goog.require('ol.events.EventType');
goog.require('ol.extent');
goog.require('ol.obj');
goog.require('ol.source.Image');
goog.require('ol.uri');


/**
 * @classdesc
 * Source for data from ArcGIS Rest services providing single, untiled images.
 * Useful when underlying map service has labels.
 *
 * If underlying map service is not using labels,
 * take advantage of ol image caching and use
 * {@link ol.source.TileArcGISRest} data source.
 *
 * @constructor
 * @fires ol.source.ImageEvent
 * @extends {ol.source.Image}
 * @param {olx.source.ImageArcGISRestOptions=} opt_options Image ArcGIS Rest Options.
 * @api
 */
ol.source.ImageArcGISRest = function(opt_options) {

  var options = opt_options || {};

  ol.source.Image.call(this, {
    attributions: options.attributions,
    logo: options.logo,
    projection: options.projection,
    resolutions: options.resolutions
  });

  /**
   * @private
   * @type {?string}
   */
  this.crossOrigin_ =
      options.crossOrigin !== undefined ? options.crossOrigin : null;

  /**
   * @private
   * @type {string|undefined}
   */
  this.url_ = options.url;

  /**
   * @private
   * @type {ol.ImageLoadFunctionType}
   */
  this.imageLoadFunction_ = options.imageLoadFunction !== undefined ?
      options.imageLoadFunction : ol.source.Image.defaultImageLoadFunction;


  /**
   * @private
   * @type {!Object}
   */
  this.params_ = options.params || {};

  /**
   * @private
   * @type {ol.Image}
   */
  this.image_ = null;

  /**
   * @private
   * @type {ol.Size}
   */
  this.imageSize_ = [0, 0];


  /**
   * @private
   * @type {number}
   */
  this.renderedRevision_ = 0;

  /**
   * @private
   * @type {number}
   */
  this.ratio_ = options.ratio !== undefined ? options.ratio : 1.5;

};
ol.inherits(ol.source.ImageArcGISRest, ol.source.Image);


/**
 * Get the user-provided params, i.e. those passed to the constructor through
 * the "params" option, and possibly updated using the updateParams method.
 * @return {Object} Params.
 * @api stable
 */
ol.source.ImageArcGISRest.prototype.getParams = function() {
  return this.params_;
};


/**
 * @inheritDoc
 */
ol.source.ImageArcGISRest.prototype.getImageInternal = function(extent, resolution, pixelRatio, projection) {

  if (this.url_ === undefined) {
    return null;
  }

  resolution = this.findNearestResolution(resolution);

  var image = this.image_;
  if (image &&
      this.renderedRevision_ == this.getRevision() &&
      image.getResolution() == resolution &&
      image.getPixelRatio() == pixelRatio &&
      ol.extent.containsExtent(image.getExtent(), extent)) {
    return image;
  }

  var params = {
    'F': 'image',
    'FORMAT': 'PNG32',
    'TRANSPARENT': true
  };
  ol.obj.assign(params, this.params_);

  extent = extent.slice();
  var centerX = (extent[0] + extent[2]) / 2;
  var centerY = (extent[1] + extent[3]) / 2;
  if (this.ratio_ != 1) {
    var halfWidth = this.ratio_ * ol.extent.getWidth(extent) / 2;
    var halfHeight = this.ratio_ * ol.extent.getHeight(extent) / 2;
    extent[0] = centerX - halfWidth;
    extent[1] = centerY - halfHeight;
    extent[2] = centerX + halfWidth;
    extent[3] = centerY + halfHeight;
  }

  var imageResolution = resolution / pixelRatio;

  // Compute an integer width and height.
  var width = Math.ceil(ol.extent.getWidth(extent) / imageResolution);
  var height = Math.ceil(ol.extent.getHeight(extent) / imageResolution);

  // Modify the extent to match the integer width and height.
  extent[0] = centerX - imageResolution * width / 2;
  extent[2] = centerX + imageResolution * width / 2;
  extent[1] = centerY - imageResolution * height / 2;
  extent[3] = centerY + imageResolution * height / 2;

  this.imageSize_[0] = width;
  this.imageSize_[1] = height;

  var url = this.getRequestUrl_(extent, this.imageSize_, pixelRatio,
      projection, params);

  this.image_ = new ol.Image(extent, resolution, pixelRatio,
      this.getAttributions(), url, this.crossOrigin_, this.imageLoadFunction_);

  this.renderedRevision_ = this.getRevision();

  ol.events.listen(this.image_, ol.events.EventType.CHANGE,
      this.handleImageChange, this);

  return this.image_;

};


/**
 * Return the image load function of the source.
 * @return {ol.ImageLoadFunctionType} The image load function.
 * @api
 */
ol.source.ImageArcGISRest.prototype.getImageLoadFunction = function() {
  return this.imageLoadFunction_;
};


/**
 * @param {ol.Extent} extent Extent.
 * @param {ol.Size} size Size.
 * @param {number} pixelRatio Pixel ratio.
 * @param {ol.proj.Projection} projection Projection.
 * @param {Object} params Params.
 * @return {string} Request URL.
 * @private
 */
ol.source.ImageArcGISRest.prototype.getRequestUrl_ = function(extent, size, pixelRatio, projection, params) {

  goog.DEBUG && console.assert(this.url_ !== undefined, 'url is defined');

  // ArcGIS Server only wants the numeric portion of the projection ID.
  var srid = projection.getCode().split(':').pop();

  params['SIZE'] = size[0] + ',' + size[1];
  params['BBOX'] = extent.join(',');
  params['BBOXSR'] = srid;
  params['IMAGESR'] = srid;
  params['DPI'] = 90 * pixelRatio;

  var url = this.url_;

  var modifiedUrl = url
    .replace(/MapServer\/?$/, 'MapServer/export')
    .replace(/ImageServer\/?$/, 'ImageServer/exportImage');
  if (modifiedUrl == url) {
    ol.asserts.assert(false, 50); // `options.featureTypes` should be an Array
  }
  return ol.uri.appendParams(modifiedUrl, params);
};


/**
 * Return the URL used for this ArcGIS source.
 * @return {string|undefined} URL.
 * @api stable
 */
ol.source.ImageArcGISRest.prototype.getUrl = function() {
  return this.url_;
};


/**
 * Set the image load function of the source.
 * @param {ol.ImageLoadFunctionType} imageLoadFunction Image load function.
 * @api
 */
ol.source.ImageArcGISRest.prototype.setImageLoadFunction = function(imageLoadFunction) {
  this.image_ = null;
  this.imageLoadFunction_ = imageLoadFunction;
  this.changed();
};


/**
 * Set the URL to use for requests.
 * @param {string|undefined} url URL.
 * @api stable
 */
ol.source.ImageArcGISRest.prototype.setUrl = function(url) {
  if (url != this.url_) {
    this.url_ = url;
    this.image_ = null;
    this.changed();
  }
};


/**
 * Update the user-provided params.
 * @param {Object} params Params.
 * @api stable
 */
ol.source.ImageArcGISRest.prototype.updateParams = function(params) {
  ol.obj.assign(this.params_, params);
  this.image_ = null;
  this.changed();
};

goog.provide('ol.source.ImageMapGuide');

goog.require('ol');
goog.require('ol.Image');
goog.require('ol.events');
goog.require('ol.events.EventType');
goog.require('ol.extent');
goog.require('ol.obj');
goog.require('ol.source.Image');
goog.require('ol.uri');


/**
 * @classdesc
 * Source for images from Mapguide servers
 *
 * @constructor
 * @fires ol.source.ImageEvent
 * @extends {ol.source.Image}
 * @param {olx.source.ImageMapGuideOptions} options Options.
 * @api stable
 */
ol.source.ImageMapGuide = function(options) {

  ol.source.Image.call(this, {
    projection: options.projection,
    resolutions: options.resolutions
  });

  /**
   * @private
   * @type {?string}
   */
  this.crossOrigin_ =
      options.crossOrigin !== undefined ? options.crossOrigin : null;

  /**
   * @private
   * @type {number}
   */
  this.displayDpi_ = options.displayDpi !== undefined ?
      options.displayDpi : 96;

  /**
   * @private
   * @type {!Object}
   */
  this.params_ = options.params || {};

  /**
   * @private
   * @type {string|undefined}
   */
  this.url_ = options.url;

  /**
   * @private
   * @type {ol.ImageLoadFunctionType}
   */
  this.imageLoadFunction_ = options.imageLoadFunction !== undefined ?
      options.imageLoadFunction : ol.source.Image.defaultImageLoadFunction;

  /**
   * @private
   * @type {boolean}
   */
  this.hidpi_ = options.hidpi !== undefined ? options.hidpi : true;

  /**
   * @private
   * @type {number}
   */
  this.metersPerUnit_ = options.metersPerUnit !== undefined ?
      options.metersPerUnit : 1;

  /**
   * @private
   * @type {number}
   */
  this.ratio_ = options.ratio !== undefined ? options.ratio : 1;

  /**
   * @private
   * @type {boolean}
   */
  this.useOverlay_ = options.useOverlay !== undefined ?
      options.useOverlay : false;

  /**
   * @private
   * @type {ol.Image}
   */
  this.image_ = null;

  /**
   * @private
   * @type {number}
   */
  this.renderedRevision_ = 0;

};
ol.inherits(ol.source.ImageMapGuide, ol.source.Image);


/**
 * Get the user-provided params, i.e. those passed to the constructor through
 * the "params" option, and possibly updated using the updateParams method.
 * @return {Object} Params.
 * @api stable
 */
ol.source.ImageMapGuide.prototype.getParams = function() {
  return this.params_;
};


/**
 * @inheritDoc
 */
ol.source.ImageMapGuide.prototype.getImageInternal = function(extent, resolution, pixelRatio, projection) {
  resolution = this.findNearestResolution(resolution);
  pixelRatio = this.hidpi_ ? pixelRatio : 1;

  var image = this.image_;
  if (image &&
      this.renderedRevision_ == this.getRevision() &&
      image.getResolution() == resolution &&
      image.getPixelRatio() == pixelRatio &&
      ol.extent.containsExtent(image.getExtent(), extent)) {
    return image;
  }

  if (this.ratio_ != 1) {
    extent = extent.slice();
    ol.extent.scaleFromCenter(extent, this.ratio_);
  }
  var width = ol.extent.getWidth(extent) / resolution;
  var height = ol.extent.getHeight(extent) / resolution;
  var size = [width * pixelRatio, height * pixelRatio];

  if (this.url_ !== undefined) {
    var imageUrl = this.getUrl(this.url_, this.params_, extent, size,
        projection);
    image = new ol.Image(extent, resolution, pixelRatio,
        this.getAttributions(), imageUrl, this.crossOrigin_,
        this.imageLoadFunction_);
    ol.events.listen(image, ol.events.EventType.CHANGE,
        this.handleImageChange, this);
  } else {
    image = null;
  }
  this.image_ = image;
  this.renderedRevision_ = this.getRevision();

  return image;
};


/**
 * Return the image load function of the source.
 * @return {ol.ImageLoadFunctionType} The image load function.
 * @api
 */
ol.source.ImageMapGuide.prototype.getImageLoadFunction = function() {
  return this.imageLoadFunction_;
};


/**
 * @param {ol.Extent} extent The map extents.
 * @param {ol.Size} size The viewport size.
 * @param {number} metersPerUnit The meters-per-unit value.
 * @param {number} dpi The display resolution.
 * @return {number} The computed map scale.
 */
ol.source.ImageMapGuide.getScale = function(extent, size, metersPerUnit, dpi) {
  var mcsW = ol.extent.getWidth(extent);
  var mcsH = ol.extent.getHeight(extent);
  var devW = size[0];
  var devH = size[1];
  var mpp = 0.0254 / dpi;
  if (devH * mcsW > devW * mcsH) {
    return mcsW * metersPerUnit / (devW * mpp); // width limited
  } else {
    return mcsH * metersPerUnit / (devH * mpp); // height limited
  }
};


/**
 * Update the user-provided params.
 * @param {Object} params Params.
 * @api stable
 */
ol.source.ImageMapGuide.prototype.updateParams = function(params) {
  ol.obj.assign(this.params_, params);
  this.changed();
};


/**
 * @param {string} baseUrl The mapagent url.
 * @param {Object.<string, string|number>} params Request parameters.
 * @param {ol.Extent} extent Extent.
 * @param {ol.Size} size Size.
 * @param {ol.proj.Projection} projection Projection.
 * @return {string} The mapagent map image request URL.
 */
ol.source.ImageMapGuide.prototype.getUrl = function(baseUrl, params, extent, size, projection) {
  var scale = ol.source.ImageMapGuide.getScale(extent, size,
      this.metersPerUnit_, this.displayDpi_);
  var center = ol.extent.getCenter(extent);
  var baseParams = {
    'OPERATION': this.useOverlay_ ? 'GETDYNAMICMAPOVERLAYIMAGE' : 'GETMAPIMAGE',
    'VERSION': '2.0.0',
    'LOCALE': 'en',
    'CLIENTAGENT': 'ol.source.ImageMapGuide source',
    'CLIP': '1',
    'SETDISPLAYDPI': this.displayDpi_,
    'SETDISPLAYWIDTH': Math.round(size[0]),
    'SETDISPLAYHEIGHT': Math.round(size[1]),
    'SETVIEWSCALE': scale,
    'SETVIEWCENTERX': center[0],
    'SETVIEWCENTERY': center[1]
  };
  ol.obj.assign(baseParams, params);
  return ol.uri.appendParams(baseUrl, baseParams);
};


/**
 * Set the image load function of the MapGuide source.
 * @param {ol.ImageLoadFunctionType} imageLoadFunction Image load function.
 * @api
 */
ol.source.ImageMapGuide.prototype.setImageLoadFunction = function(
    imageLoadFunction) {
  this.image_ = null;
  this.imageLoadFunction_ = imageLoadFunction;
  this.changed();
};

goog.provide('ol.source.ImageStatic');

goog.require('ol');
goog.require('ol.Image');
goog.require('ol.ImageState');
goog.require('ol.dom');
goog.require('ol.events');
goog.require('ol.events.EventType');
goog.require('ol.extent');
goog.require('ol.proj');
goog.require('ol.source.Image');


/**
 * @classdesc
 * A layer source for displaying a single, static image.
 *
 * @constructor
 * @extends {ol.source.Image}
 * @param {olx.source.ImageStaticOptions} options Options.
 * @api stable
 */
ol.source.ImageStatic = function(options) {
  var imageExtent = options.imageExtent;

  var crossOrigin = options.crossOrigin !== undefined ?
      options.crossOrigin : null;

  var /** @type {ol.ImageLoadFunctionType} */ imageLoadFunction =
      options.imageLoadFunction !== undefined ?
      options.imageLoadFunction : ol.source.Image.defaultImageLoadFunction;

  ol.source.Image.call(this, {
    attributions: options.attributions,
    logo: options.logo,
    projection: ol.proj.get(options.projection)
  });

  /**
   * @private
   * @type {ol.Image}
   */
  this.image_ = new ol.Image(imageExtent, undefined, 1, this.getAttributions(),
      options.url, crossOrigin, imageLoadFunction);

  /**
   * @private
   * @type {ol.Size}
   */
  this.imageSize_ = options.imageSize ? options.imageSize : null;

  ol.events.listen(this.image_, ol.events.EventType.CHANGE,
      this.handleImageChange, this);

};
ol.inherits(ol.source.ImageStatic, ol.source.Image);


/**
 * @inheritDoc
 */
ol.source.ImageStatic.prototype.getImageInternal = function(extent, resolution, pixelRatio, projection) {
  if (ol.extent.intersects(extent, this.image_.getExtent())) {
    return this.image_;
  }
  return null;
};


/**
 * @inheritDoc
 */
ol.source.ImageStatic.prototype.handleImageChange = function(evt) {
  if (this.image_.getState() == ol.ImageState.LOADED) {
    var imageExtent = this.image_.getExtent();
    var image = this.image_.getImage();
    var imageWidth, imageHeight;
    if (this.imageSize_) {
      imageWidth = this.imageSize_[0];
      imageHeight = this.imageSize_[1];
    } else {
      // TODO: remove the type cast when a closure-compiler > 20160315 is used.
      // see: https://github.com/google/closure-compiler/pull/1664
      imageWidth = /** @type {number} */ (image.width);
      imageHeight = /** @type {number} */ (image.height);
    }
    var resolution = ol.extent.getHeight(imageExtent) / imageHeight;
    var targetWidth = Math.ceil(ol.extent.getWidth(imageExtent) / resolution);
    if (targetWidth != imageWidth) {
      var context = ol.dom.createCanvasContext2D(targetWidth, imageHeight);
      var canvas = context.canvas;
      context.drawImage(image, 0, 0, imageWidth, imageHeight,
          0, 0, canvas.width, canvas.height);
      this.image_.setImage(canvas);
    }
  }
  ol.source.Image.prototype.handleImageChange.call(this, evt);
};

goog.provide('ol.source.wms');
goog.provide('ol.source.wms.ServerType');


/**
 * Available server types: `'carmentaserver'`, `'geoserver'`, `'mapserver'`,
 *     `'qgis'`. These are servers that have vendor parameters beyond the WMS
 *     specification that OpenLayers can make use of.
 * @enum {string}
 */
ol.source.wms.ServerType = {
  CARMENTA_SERVER: 'carmentaserver',
  GEOSERVER: 'geoserver',
  MAPSERVER: 'mapserver',
  QGIS: 'qgis'
};

// FIXME cannot be shared between maps with different projections

goog.provide('ol.source.ImageWMS');

goog.require('ol');
goog.require('ol.Image');
goog.require('ol.asserts');
goog.require('ol.events');
goog.require('ol.events.EventType');
goog.require('ol.extent');
goog.require('ol.obj');
goog.require('ol.proj');
goog.require('ol.source.Image');
goog.require('ol.source.wms.ServerType');
goog.require('ol.string');
goog.require('ol.uri');


/**
 * @classdesc
 * Source for WMS servers providing single, untiled images.
 *
 * @constructor
 * @fires ol.source.ImageEvent
 * @extends {ol.source.Image}
 * @param {olx.source.ImageWMSOptions=} opt_options Options.
 * @api stable
 */
ol.source.ImageWMS = function(opt_options) {

  var options = opt_options || {};

  ol.source.Image.call(this, {
    attributions: options.attributions,
    logo: options.logo,
    projection: options.projection,
    resolutions: options.resolutions
  });

  /**
   * @private
   * @type {?string}
   */
  this.crossOrigin_ =
      options.crossOrigin !== undefined ? options.crossOrigin : null;

  /**
   * @private
   * @type {string|undefined}
   */
  this.url_ = options.url;

  /**
   * @private
   * @type {ol.ImageLoadFunctionType}
   */
  this.imageLoadFunction_ = options.imageLoadFunction !== undefined ?
      options.imageLoadFunction : ol.source.Image.defaultImageLoadFunction;

  /**
   * @private
   * @type {!Object}
   */
  this.params_ = options.params || {};

  /**
   * @private
   * @type {boolean}
   */
  this.v13_ = true;
  this.updateV13_();

  /**
   * @private
   * @type {ol.source.wms.ServerType|undefined}
   */
  this.serverType_ =
      /** @type {ol.source.wms.ServerType|undefined} */ (options.serverType);

  /**
   * @private
   * @type {boolean}
   */
  this.hidpi_ = options.hidpi !== undefined ? options.hidpi : true;

  /**
   * @private
   * @type {ol.Image}
   */
  this.image_ = null;

  /**
   * @private
   * @type {ol.Size}
   */
  this.imageSize_ = [0, 0];

  /**
   * @private
   * @type {number}
   */
  this.renderedRevision_ = 0;

  /**
   * @private
   * @type {number}
   */
  this.ratio_ = options.ratio !== undefined ? options.ratio : 1.5;

};
ol.inherits(ol.source.ImageWMS, ol.source.Image);


/**
 * @const
 * @type {ol.Size}
 * @private
 */
ol.source.ImageWMS.GETFEATUREINFO_IMAGE_SIZE_ = [101, 101];


/**
 * Return the GetFeatureInfo URL for the passed coordinate, resolution, and
 * projection. Return `undefined` if the GetFeatureInfo URL cannot be
 * constructed.
 * @param {ol.Coordinate} coordinate Coordinate.
 * @param {number} resolution Resolution.
 * @param {ol.ProjectionLike} projection Projection.
 * @param {!Object} params GetFeatureInfo params. `INFO_FORMAT` at least should
 *     be provided. If `QUERY_LAYERS` is not provided then the layers specified
 *     in the `LAYERS` parameter will be used. `VERSION` should not be
 *     specified here.
 * @return {string|undefined} GetFeatureInfo URL.
 * @api stable
 */
ol.source.ImageWMS.prototype.getGetFeatureInfoUrl = function(coordinate, resolution, projection, params) {

  goog.DEBUG && console.assert(!('VERSION' in params),
      'key VERSION is not allowed in params');

  if (this.url_ === undefined) {
    return undefined;
  }

  var extent = ol.extent.getForViewAndSize(
      coordinate, resolution, 0,
      ol.source.ImageWMS.GETFEATUREINFO_IMAGE_SIZE_);

  var baseParams = {
    'SERVICE': 'WMS',
    'VERSION': ol.DEFAULT_WMS_VERSION,
    'REQUEST': 'GetFeatureInfo',
    'FORMAT': 'image/png',
    'TRANSPARENT': true,
    'QUERY_LAYERS': this.params_['LAYERS']
  };
  ol.obj.assign(baseParams, this.params_, params);

  var x = Math.floor((coordinate[0] - extent[0]) / resolution);
  var y = Math.floor((extent[3] - coordinate[1]) / resolution);
  baseParams[this.v13_ ? 'I' : 'X'] = x;
  baseParams[this.v13_ ? 'J' : 'Y'] = y;

  return this.getRequestUrl_(
      extent, ol.source.ImageWMS.GETFEATUREINFO_IMAGE_SIZE_,
      1, ol.proj.get(projection), baseParams);
};


/**
 * Get the user-provided params, i.e. those passed to the constructor through
 * the "params" option, and possibly updated using the updateParams method.
 * @return {Object} Params.
 * @api stable
 */
ol.source.ImageWMS.prototype.getParams = function() {
  return this.params_;
};


/**
 * @inheritDoc
 */
ol.source.ImageWMS.prototype.getImageInternal = function(extent, resolution, pixelRatio, projection) {

  if (this.url_ === undefined) {
    return null;
  }

  resolution = this.findNearestResolution(resolution);

  if (pixelRatio != 1 && (!this.hidpi_ || this.serverType_ === undefined)) {
    pixelRatio = 1;
  }

  extent = extent.slice();
  var centerX = (extent[0] + extent[2]) / 2;
  var centerY = (extent[1] + extent[3]) / 2;

  var imageResolution = resolution / pixelRatio;
  var imageWidth = ol.extent.getWidth(extent) / imageResolution;
  var imageHeight = ol.extent.getHeight(extent) / imageResolution;

  var image = this.image_;
  if (image &&
      this.renderedRevision_ == this.getRevision() &&
      image.getResolution() == resolution &&
      image.getPixelRatio() == pixelRatio &&
      ol.extent.containsExtent(image.getExtent(), extent)) {
    return image;
  }

  if (this.ratio_ != 1) {
    var halfWidth = this.ratio_ * ol.extent.getWidth(extent) / 2;
    var halfHeight = this.ratio_ * ol.extent.getHeight(extent) / 2;
    extent[0] = centerX - halfWidth;
    extent[1] = centerY - halfHeight;
    extent[2] = centerX + halfWidth;
    extent[3] = centerY + halfHeight;
  }

  var params = {
    'SERVICE': 'WMS',
    'VERSION': ol.DEFAULT_WMS_VERSION,
    'REQUEST': 'GetMap',
    'FORMAT': 'image/png',
    'TRANSPARENT': true
  };
  ol.obj.assign(params, this.params_);

  this.imageSize_[0] = Math.ceil(imageWidth * this.ratio_);
  this.imageSize_[1] = Math.ceil(imageHeight * this.ratio_);

  var url = this.getRequestUrl_(extent, this.imageSize_, pixelRatio,
      projection, params);

  this.image_ = new ol.Image(extent, resolution, pixelRatio,
      this.getAttributions(), url, this.crossOrigin_, this.imageLoadFunction_);

  this.renderedRevision_ = this.getRevision();

  ol.events.listen(this.image_, ol.events.EventType.CHANGE,
      this.handleImageChange, this);

  return this.image_;

};


/**
 * Return the image load function of the source.
 * @return {ol.ImageLoadFunctionType} The image load function.
 * @api
 */
ol.source.ImageWMS.prototype.getImageLoadFunction = function() {
  return this.imageLoadFunction_;
};


/**
 * @param {ol.Extent} extent Extent.
 * @param {ol.Size} size Size.
 * @param {number} pixelRatio Pixel ratio.
 * @param {ol.proj.Projection} projection Projection.
 * @param {Object} params Params.
 * @return {string} Request URL.
 * @private
 */
ol.source.ImageWMS.prototype.getRequestUrl_ = function(extent, size, pixelRatio, projection, params) {

  ol.asserts.assert(this.url_ !== undefined, 9); // `url` must be configured or set using `#setUrl()`

  params[this.v13_ ? 'CRS' : 'SRS'] = projection.getCode();

  if (!('STYLES' in this.params_)) {
    params['STYLES'] = '';
  }

  if (pixelRatio != 1) {
    switch (this.serverType_) {
      case ol.source.wms.ServerType.GEOSERVER:
        var dpi = (90 * pixelRatio + 0.5) | 0;
        if ('FORMAT_OPTIONS' in params) {
          params['FORMAT_OPTIONS'] += ';dpi:' + dpi;
        } else {
          params['FORMAT_OPTIONS'] = 'dpi:' + dpi;
        }
        break;
      case ol.source.wms.ServerType.MAPSERVER:
        params['MAP_RESOLUTION'] = 90 * pixelRatio;
        break;
      case ol.source.wms.ServerType.CARMENTA_SERVER:
      case ol.source.wms.ServerType.QGIS:
        params['DPI'] = 90 * pixelRatio;
        break;
      default:
        ol.asserts.assert(false, 8); // Unknown `serverType` configured
        break;
    }
  }

  params['WIDTH'] = size[0];
  params['HEIGHT'] = size[1];

  var axisOrientation = projection.getAxisOrientation();
  var bbox;
  if (this.v13_ && axisOrientation.substr(0, 2) == 'ne') {
    bbox = [extent[1], extent[0], extent[3], extent[2]];
  } else {
    bbox = extent;
  }
  params['BBOX'] = bbox.join(',');

  return ol.uri.appendParams(/** @type {string} */ (this.url_), params);
};


/**
 * Return the URL used for this WMS source.
 * @return {string|undefined} URL.
 * @api stable
 */
ol.source.ImageWMS.prototype.getUrl = function() {
  return this.url_;
};


/**
 * Set the image load function of the source.
 * @param {ol.ImageLoadFunctionType} imageLoadFunction Image load function.
 * @api
 */
ol.source.ImageWMS.prototype.setImageLoadFunction = function(
    imageLoadFunction) {
  this.image_ = null;
  this.imageLoadFunction_ = imageLoadFunction;
  this.changed();
};


/**
 * Set the URL to use for requests.
 * @param {string|undefined} url URL.
 * @api stable
 */
ol.source.ImageWMS.prototype.setUrl = function(url) {
  if (url != this.url_) {
    this.url_ = url;
    this.image_ = null;
    this.changed();
  }
};


/**
 * Update the user-provided params.
 * @param {Object} params Params.
 * @api stable
 */
ol.source.ImageWMS.prototype.updateParams = function(params) {
  ol.obj.assign(this.params_, params);
  this.updateV13_();
  this.image_ = null;
  this.changed();
};


/**
 * @private
 */
ol.source.ImageWMS.prototype.updateV13_ = function() {
  var version = this.params_['VERSION'] || ol.DEFAULT_WMS_VERSION;
  this.v13_ = ol.string.compareVersions(version, '1.3') >= 0;
};

goog.provide('ol.source.OSM');

goog.require('ol');
goog.require('ol.Attribution');
goog.require('ol.source.XYZ');


/**
 * @classdesc
 * Layer source for the OpenStreetMap tile server.
 *
 * @constructor
 * @extends {ol.source.XYZ}
 * @param {olx.source.OSMOptions=} opt_options Open Street Map options.
 * @api stable
 */
ol.source.OSM = function(opt_options) {

  var options = opt_options || {};

  var attributions;
  if (options.attributions !== undefined) {
    attributions = options.attributions;
  } else {
    attributions = [ol.source.OSM.ATTRIBUTION];
  }

  var crossOrigin = options.crossOrigin !== undefined ?
      options.crossOrigin : 'anonymous';

  var url = options.url !== undefined ?
      options.url : 'https://{a-c}.tile.openstreetmap.org/{z}/{x}/{y}.png';

  ol.source.XYZ.call(this, {
    attributions: attributions,
    cacheSize: options.cacheSize,
    crossOrigin: crossOrigin,
    opaque: options.opaque !== undefined ? options.opaque : true,
    maxZoom: options.maxZoom !== undefined ? options.maxZoom : 19,
    reprojectionErrorThreshold: options.reprojectionErrorThreshold,
    tileLoadFunction: options.tileLoadFunction,
    url: url,
    wrapX: options.wrapX
  });

};
ol.inherits(ol.source.OSM, ol.source.XYZ);


/**
 * The attribution containing a link to the OpenStreetMap Copyright and License
 * page.
 * @const
 * @type {ol.Attribution}
 * @api
 */
ol.source.OSM.ATTRIBUTION = new ol.Attribution({
  html: '&copy; ' +
      '<a href="http://www.openstreetmap.org/copyright">OpenStreetMap</a> ' +
      'contributors.'
});

goog.provide('ol.ext.pixelworks');
/** @typedef {function(*)} */
ol.ext.pixelworks;
(function() {
var exports = {};
var module = {exports: exports};
var define;
/**
 * @fileoverview
 * @suppress {accessControls, ambiguousFunctionDecl, checkDebuggerStatement, checkRegExp, checkTypes, checkVars, const, constantProperty, deprecated, duplicate, es5Strict, fileoverviewTags, missingProperties, nonStandardJsDocs, strictModuleDepCheck, suspiciousCode, undefinedNames, undefinedVars, unknownDefines, uselessCode, visibility}
 */
(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.pixelworks = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(_dereq_,module,exports){
var Processor = _dereq_('./processor');

exports.Processor = Processor;

},{"./processor":2}],2:[function(_dereq_,module,exports){
var newImageData = _dereq_('./util').newImageData;

/**
 * Create a function for running operations.  This function is serialized for
 * use in a worker.
 * @param {function(Array, Object):*} operation The operation.
 * @return {function(Object):ArrayBuffer} A function that takes an object with
 * buffers, meta, imageOps, width, and height properties and returns an array
 * buffer.
 */
function createMinion(operation) {
  var workerHasImageData = true;
  try {
    new ImageData(10, 10);
  } catch (_) {
    workerHasImageData = false;
  }

  function newWorkerImageData(data, width, height) {
    if (workerHasImageData) {
      return new ImageData(data, width, height);
    } else {
      return {data: data, width: width, height: height};
    }
  }

  return function(data) {
    // bracket notation for minification support
    var buffers = data['buffers'];
    var meta = data['meta'];
    var imageOps = data['imageOps'];
    var width = data['width'];
    var height = data['height'];

    var numBuffers = buffers.length;
    var numBytes = buffers[0].byteLength;
    var output, b;

    if (imageOps) {
      var images = new Array(numBuffers);
      for (b = 0; b < numBuffers; ++b) {
        images[b] = newWorkerImageData(
            new Uint8ClampedArray(buffers[b]), width, height);
      }
      output = operation(images, meta).data;
    } else {
      output = new Uint8ClampedArray(numBytes);
      var arrays = new Array(numBuffers);
      var pixels = new Array(numBuffers);
      for (b = 0; b < numBuffers; ++b) {
        arrays[b] = new Uint8ClampedArray(buffers[b]);
        pixels[b] = [0, 0, 0, 0];
      }
      for (var i = 0; i < numBytes; i += 4) {
        for (var j = 0; j < numBuffers; ++j) {
          var array = arrays[j];
          pixels[j][0] = array[i];
          pixels[j][1] = array[i + 1];
          pixels[j][2] = array[i + 2];
          pixels[j][3] = array[i + 3];
        }
        var pixel = operation(pixels, meta);
        output[i] = pixel[0];
        output[i + 1] = pixel[1];
        output[i + 2] = pixel[2];
        output[i + 3] = pixel[3];
      }
    }
    return output.buffer;
  };
}

/**
 * Create a worker for running operations.
 * @param {Object} config Configuration.
 * @param {function(MessageEvent)} onMessage Called with a message event.
 * @return {Worker} The worker.
 */
function createWorker(config, onMessage) {
  var lib = Object.keys(config.lib || {}).map(function(name) {
    return 'var ' + name + ' = ' + config.lib[name].toString() + ';';
  });

  var lines = lib.concat([
    'var __minion__ = (' + createMinion.toString() + ')(', config.operation.toString(), ');',
    'self.addEventListener("message", function(event) {',
    '  var buffer = __minion__(event.data);',
    '  self.postMessage({buffer: buffer, meta: event.data.meta}, [buffer]);',
    '});'
  ]);

  var blob = new Blob(lines, {type: 'text/javascript'});
  var source = URL.createObjectURL(blob);
  var worker = new Worker(source);
  worker.addEventListener('message', onMessage);
  return worker;
}

/**
 * Create a faux worker for running operations.
 * @param {Object} config Configuration.
 * @param {function(MessageEvent)} onMessage Called with a message event.
 * @return {Object} The faux worker.
 */
function createFauxWorker(config, onMessage) {
  var minion = createMinion(config.operation);
  return {
    postMessage: function(data) {
      setTimeout(function() {
        onMessage({'data': {'buffer': minion(data), 'meta': data['meta']}});
      }, 0);
    }
  };
}

/**
 * A processor runs pixel or image operations in workers.
 * @param {Object} config Configuration.
 */
function Processor(config) {
  this._imageOps = !!config.imageOps;
  var threads;
  if (config.threads === 0) {
    threads = 0;
  } else if (this._imageOps) {
    threads = 1;
  } else {
    threads = config.threads || 1;
  }
  var workers = [];
  if (threads) {
    for (var i = 0; i < threads; ++i) {
      workers[i] = createWorker(config, this._onWorkerMessage.bind(this, i));
    }
  } else {
    workers[0] = createFauxWorker(config, this._onWorkerMessage.bind(this, 0));
  }
  this._workers = workers;
  this._queue = [];
  this._maxQueueLength = config.queue || Infinity;
  this._running = 0;
  this._dataLookup = {};
  this._job = null;
}

/**
 * Run operation on input data.
 * @param {Array.<Array|ImageData>} inputs Array of pixels or image data
 *     (depending on the operation type).
 * @param {Object} meta A user data object.  This is passed to all operations
 *     and must be serializable.
 * @param {function(Error, ImageData, Object)} callback Called when work
 *     completes.  The first argument is any error.  The second is the ImageData
 *     generated by operations.  The third is the user data object.
 */
Processor.prototype.process = function(inputs, meta, callback) {
  this._enqueue({
    inputs: inputs,
    meta: meta,
    callback: callback
  });
  this._dispatch();
};

/**
 * Stop responding to any completed work and destroy the processor.
 */
Processor.prototype.destroy = function() {
  for (var key in this) {
    this[key] = null;
  }
  this._destroyed = true;
};

/**
 * Add a job to the queue.
 * @param {Object} job The job.
 */
Processor.prototype._enqueue = function(job) {
  this._queue.push(job);
  while (this._queue.length > this._maxQueueLength) {
    this._queue.shift().callback(null, null);
  }
};

/**
 * Dispatch a job.
 */
Processor.prototype._dispatch = function() {
  if (this._running === 0 && this._queue.length > 0) {
    var job = this._job = this._queue.shift();
    var width = job.inputs[0].width;
    var height = job.inputs[0].height;
    var buffers = job.inputs.map(function(input) {
      return input.data.buffer;
    });
    var threads = this._workers.length;
    this._running = threads;
    if (threads === 1) {
      this._workers[0].postMessage({
        'buffers': buffers,
        'meta': job.meta,
        'imageOps': this._imageOps,
        'width': width,
        'height': height
      }, buffers);
    } else {
      var length = job.inputs[0].data.length;
      var segmentLength = 4 * Math.ceil(length / 4 / threads);
      for (var i = 0; i < threads; ++i) {
        var offset = i * segmentLength;
        var slices = [];
        for (var j = 0, jj = buffers.length; j < jj; ++j) {
          slices.push(buffers[i].slice(offset, offset + segmentLength));
        }
        this._workers[i].postMessage({
          'buffers': slices,
          'meta': job.meta,
          'imageOps': this._imageOps,
          'width': width,
          'height': height
        }, slices);
      }
    }
  }
};

/**
 * Handle messages from the worker.
 * @param {number} index The worker index.
 * @param {MessageEvent} event The message event.
 */
Processor.prototype._onWorkerMessage = function(index, event) {
  if (this._destroyed) {
    return;
  }
  this._dataLookup[index] = event.data;
  --this._running;
  if (this._running === 0) {
    this._resolveJob();
  }
};

/**
 * Resolve a job.  If there are no more worker threads, the processor callback
 * will be called.
 */
Processor.prototype._resolveJob = function() {
  var job = this._job;
  var threads = this._workers.length;
  var data, meta;
  if (threads === 1) {
    data = new Uint8ClampedArray(this._dataLookup[0]['buffer']);
    meta = this._dataLookup[0]['meta'];
  } else {
    var length = job.inputs[0].data.length;
    data = new Uint8ClampedArray(length);
    meta = new Array(length);
    var segmentLength = 4 * Math.ceil(length / 4 / threads);
    for (var i = 0; i < threads; ++i) {
      var buffer = this._dataLookup[i]['buffer'];
      var offset = i * segmentLength;
      data.set(new Uint8ClampedArray(buffer), offset);
      meta[i] = this._dataLookup[i]['meta'];
    }
  }
  this._job = null;
  this._dataLookup = {};
  job.callback(null,
      newImageData(data, job.inputs[0].width, job.inputs[0].height), meta);
  this._dispatch();
};

module.exports = Processor;

},{"./util":3}],3:[function(_dereq_,module,exports){
var hasImageData = true;
try {
  new ImageData(10, 10);
} catch (_) {
  hasImageData = false;
}

var context = document.createElement('canvas').getContext('2d');

function newImageData(data, width, height) {
  if (hasImageData) {
    return new ImageData(data, width, height);
  } else {
    var imageData = context.createImageData(width, height);
    imageData.data.set(data);
    return imageData;
  }
}

exports.newImageData = newImageData;

},{}]},{},[1])(1)
});
ol.ext.pixelworks = module.exports;
})();

goog.provide('ol.source.Raster');
goog.provide('ol.RasterOperationType');
goog.provide('ol.source.RasterEvent');
goog.provide('ol.source.RasterEventType');

goog.require('ol');
goog.require('ol.transform');
goog.require('ol.ImageCanvas');
goog.require('ol.TileQueue');
goog.require('ol.dom');
goog.require('ol.events');
goog.require('ol.events.Event');
goog.require('ol.events.EventType');
goog.require('ol.ext.pixelworks');
goog.require('ol.extent');
goog.require('ol.layer.Image');
goog.require('ol.layer.Tile');
goog.require('ol.obj');
goog.require('ol.renderer.canvas.ImageLayer');
goog.require('ol.renderer.canvas.TileLayer');
goog.require('ol.source.Image');
goog.require('ol.source.State');
goog.require('ol.source.Tile');


/**
 * Raster operation type. Supported values are `'pixel'` and `'image'`.
 * @enum {string}
 */
ol.RasterOperationType = {
  PIXEL: 'pixel',
  IMAGE: 'image'
};


/**
 * @classdesc
 * A source that transforms data from any number of input sources using an array
 * of {@link ol.RasterOperation} functions to transform input pixel values into
 * output pixel values.
 *
 * @constructor
 * @extends {ol.source.Image}
 * @fires ol.source.RasterEvent
 * @param {olx.source.RasterOptions} options Options.
 * @api
 */
ol.source.Raster = function(options) {

  /**
   * @private
   * @type {*}
   */
  this.worker_ = null;

  /**
   * @private
   * @type {ol.RasterOperationType}
   */
  this.operationType_ = options.operationType !== undefined ?
      options.operationType : ol.RasterOperationType.PIXEL;

  /**
   * @private
   * @type {number}
   */
  this.threads_ = options.threads !== undefined ? options.threads : 1;

  /**
   * @private
   * @type {Array.<ol.renderer.canvas.Layer>}
   */
  this.renderers_ = ol.source.Raster.createRenderers_(options.sources);

  for (var r = 0, rr = this.renderers_.length; r < rr; ++r) {
    ol.events.listen(this.renderers_[r], ol.events.EventType.CHANGE,
        this.changed, this);
  }

  /**
   * @private
   * @type {CanvasRenderingContext2D}
   */
  this.canvasContext_ = ol.dom.createCanvasContext2D();

  /**
   * @private
   * @type {ol.TileQueue}
   */
  this.tileQueue_ = new ol.TileQueue(
      function() {
        return 1;
      },
      this.changed.bind(this));

  var layerStatesArray = ol.source.Raster.getLayerStatesArray_(this.renderers_);
  var layerStates = {};
  for (var i = 0, ii = layerStatesArray.length; i < ii; ++i) {
    layerStates[ol.getUid(layerStatesArray[i].layer)] = layerStatesArray[i];
  }

  /**
   * The most recently rendered state.
   * @type {?ol.SourceRasterRenderedState}
   * @private
   */
  this.renderedState_ = null;

  /**
   * The most recently rendered image canvas.
   * @type {ol.ImageCanvas}
   * @private
   */
  this.renderedImageCanvas_ = null;

  /**
   * @private
   * @type {olx.FrameState}
   */
  this.frameState_ = {
    animate: false,
    attributions: {},
    coordinateToPixelTransform: ol.transform.create(),
    extent: null,
    focus: null,
    index: 0,
    layerStates: layerStates,
    layerStatesArray: layerStatesArray,
    logos: {},
    pixelRatio: 1,
    pixelToCoordinateTransform: ol.transform.create(),
    postRenderFunctions: [],
    size: [0, 0],
    skippedFeatureUids: {},
    tileQueue: this.tileQueue_,
    time: Date.now(),
    usedTiles: {},
    viewState: /** @type {olx.ViewState} */ ({
      rotation: 0
    }),
    viewHints: [],
    wantedTiles: {}
  };

  ol.source.Image.call(this, {});

  if (options.operation !== undefined) {
    this.setOperation(options.operation, options.lib);
  }

};
ol.inherits(ol.source.Raster, ol.source.Image);


/**
 * Set the operation.
 * @param {ol.RasterOperation} operation New operation.
 * @param {Object=} opt_lib Functions that will be available to operations run
 *     in a worker.
 * @api
 */
ol.source.Raster.prototype.setOperation = function(operation, opt_lib) {
  this.worker_ = new ol.ext.pixelworks.Processor({
    operation: operation,
    imageOps: this.operationType_ === ol.RasterOperationType.IMAGE,
    queue: 1,
    lib: opt_lib,
    threads: this.threads_
  });
  this.changed();
};


/**
 * Update the stored frame state.
 * @param {ol.Extent} extent The view extent (in map units).
 * @param {number} resolution The view resolution.
 * @param {ol.proj.Projection} projection The view projection.
 * @return {olx.FrameState} The updated frame state.
 * @private
 */
ol.source.Raster.prototype.updateFrameState_ = function(extent, resolution, projection) {

  var frameState = /** @type {olx.FrameState} */ (
      ol.obj.assign({}, this.frameState_));

  frameState.viewState = /** @type {olx.ViewState} */ (
      ol.obj.assign({}, frameState.viewState));

  var center = ol.extent.getCenter(extent);
  var width = Math.round(ol.extent.getWidth(extent) / resolution);
  var height = Math.round(ol.extent.getHeight(extent) / resolution);

  frameState.extent = extent;
  frameState.focus = ol.extent.getCenter(extent);
  frameState.size[0] = width;
  frameState.size[1] = height;

  var viewState = frameState.viewState;
  viewState.center = center;
  viewState.projection = projection;
  viewState.resolution = resolution;
  return frameState;
};


/**
 * Determine if the most recently rendered image canvas is dirty.
 * @param {ol.Extent} extent The requested extent.
 * @param {number} resolution The requested resolution.
 * @return {boolean} The image is dirty.
 * @private
 */
ol.source.Raster.prototype.isDirty_ = function(extent, resolution) {
  var state = this.renderedState_;
  return !state ||
      this.getRevision() !== state.revision ||
      resolution !== state.resolution ||
      !ol.extent.equals(extent, state.extent);
};


/**
 * @inheritDoc
 */
ol.source.Raster.prototype.getImage = function(extent, resolution, pixelRatio, projection) {

  if (!this.allSourcesReady_()) {
    return null;
  }

  var currentExtent = extent.slice();
  if (!this.isDirty_(currentExtent, resolution)) {
    return this.renderedImageCanvas_;
  }

  var context = this.canvasContext_;
  var canvas = context.canvas;

  var width = Math.round(ol.extent.getWidth(currentExtent) / resolution);
  var height = Math.round(ol.extent.getHeight(currentExtent) / resolution);

  if (width !== canvas.width ||
      height !== canvas.height) {
    canvas.width = width;
    canvas.height = height;
  }

  var frameState = this.updateFrameState_(currentExtent, resolution, projection);

  var imageCanvas = new ol.ImageCanvas(
      currentExtent, resolution, 1, this.getAttributions(), canvas,
      this.composeFrame_.bind(this, frameState));

  this.renderedImageCanvas_ = imageCanvas;

  this.renderedState_ = {
    extent: currentExtent,
    resolution: resolution,
    revision: this.getRevision()
  };

  return imageCanvas;
};


/**
 * Determine if all sources are ready.
 * @return {boolean} All sources are ready.
 * @private
 */
ol.source.Raster.prototype.allSourcesReady_ = function() {
  var ready = true;
  var source;
  for (var i = 0, ii = this.renderers_.length; i < ii; ++i) {
    source = this.renderers_[i].getLayer().getSource();
    if (source.getState() !== ol.source.State.READY) {
      ready = false;
      break;
    }
  }
  return ready;
};


/**
 * Compose the frame.  This renders data from all sources, runs pixel-wise
 * operations, and renders the result to the stored canvas context.
 * @param {olx.FrameState} frameState The frame state.
 * @param {function(Error)} callback Called when composition is complete.
 * @private
 */
ol.source.Raster.prototype.composeFrame_ = function(frameState, callback) {
  var len = this.renderers_.length;
  var imageDatas = new Array(len);
  for (var i = 0; i < len; ++i) {
    var imageData = ol.source.Raster.getImageData_(
        this.renderers_[i], frameState, frameState.layerStatesArray[i]);
    if (imageData) {
      imageDatas[i] = imageData;
    } else {
      // image not yet ready
      return;
    }
  }

  var data = {};
  this.dispatchEvent(new ol.source.RasterEvent(
      ol.source.RasterEventType.BEFOREOPERATIONS, frameState, data));

  this.worker_.process(imageDatas, data,
      this.onWorkerComplete_.bind(this, frameState, callback));

  frameState.tileQueue.loadMoreTiles(16, 16);
};


/**
 * Called when pixel processing is complete.
 * @param {olx.FrameState} frameState The frame state.
 * @param {function(Error)} callback Called when rendering is complete.
 * @param {Error} err Any error during processing.
 * @param {ImageData} output The output image data.
 * @param {Object} data The user data.
 * @private
 */
ol.source.Raster.prototype.onWorkerComplete_ = function(frameState, callback, err, output, data) {
  if (err) {
    callback(err);
    return;
  }
  if (!output) {
    // job aborted
    return;
  }

  this.dispatchEvent(new ol.source.RasterEvent(
      ol.source.RasterEventType.AFTEROPERATIONS, frameState, data));

  var resolution = frameState.viewState.resolution / frameState.pixelRatio;
  if (!this.isDirty_(frameState.extent, resolution)) {
    this.canvasContext_.putImageData(output, 0, 0);
  }

  callback(null);
};


/**
 * Get image data from a renderer.
 * @param {ol.renderer.canvas.Layer} renderer Layer renderer.
 * @param {olx.FrameState} frameState The frame state.
 * @param {ol.LayerState} layerState The layer state.
 * @return {ImageData} The image data.
 * @private
 */
ol.source.Raster.getImageData_ = function(renderer, frameState, layerState) {
  if (!renderer.prepareFrame(frameState, layerState)) {
    return null;
  }
  var width = frameState.size[0];
  var height = frameState.size[1];
  if (!ol.source.Raster.context_) {
    ol.source.Raster.context_ = ol.dom.createCanvasContext2D(width, height);
  } else {
    var canvas = ol.source.Raster.context_.canvas;
    if (canvas.width !== width || canvas.height !== height) {
      ol.source.Raster.context_ = ol.dom.createCanvasContext2D(width, height);
    } else {
      ol.source.Raster.context_.clearRect(0, 0, width, height);
    }
  }
  renderer.composeFrame(frameState, layerState, ol.source.Raster.context_);
  return ol.source.Raster.context_.getImageData(0, 0, width, height);
};


/**
 * A reusable canvas context.
 * @type {CanvasRenderingContext2D}
 * @private
 */
ol.source.Raster.context_ = null;


/**
 * Get a list of layer states from a list of renderers.
 * @param {Array.<ol.renderer.canvas.Layer>} renderers Layer renderers.
 * @return {Array.<ol.LayerState>} The layer states.
 * @private
 */
ol.source.Raster.getLayerStatesArray_ = function(renderers) {
  return renderers.map(function(renderer) {
    return renderer.getLayer().getLayerState();
  });
};


/**
 * Create renderers for all sources.
 * @param {Array.<ol.source.Source>} sources The sources.
 * @return {Array.<ol.renderer.canvas.Layer>} Array of layer renderers.
 * @private
 */
ol.source.Raster.createRenderers_ = function(sources) {
  var len = sources.length;
  var renderers = new Array(len);
  for (var i = 0; i < len; ++i) {
    renderers[i] = ol.source.Raster.createRenderer_(sources[i]);
  }
  return renderers;
};


/**
 * Create a renderer for the provided source.
 * @param {ol.source.Source} source The source.
 * @return {ol.renderer.canvas.Layer} The renderer.
 * @private
 */
ol.source.Raster.createRenderer_ = function(source) {
  var renderer = null;
  if (source instanceof ol.source.Tile) {
    renderer = ol.source.Raster.createTileRenderer_(source);
  } else if (source instanceof ol.source.Image) {
    renderer = ol.source.Raster.createImageRenderer_(source);
  } else {
    goog.DEBUG && console.assert(false, 'Unsupported source type: ' + source);
  }
  return renderer;
};


/**
 * Create an image renderer for the provided source.
 * @param {ol.source.Image} source The source.
 * @return {ol.renderer.canvas.Layer} The renderer.
 * @private
 */
ol.source.Raster.createImageRenderer_ = function(source) {
  var layer = new ol.layer.Image({source: source});
  return new ol.renderer.canvas.ImageLayer(layer);
};


/**
 * Create a tile renderer for the provided source.
 * @param {ol.source.Tile} source The source.
 * @return {ol.renderer.canvas.Layer} The renderer.
 * @private
 */
ol.source.Raster.createTileRenderer_ = function(source) {
  var layer = new ol.layer.Tile({source: source});
  return new ol.renderer.canvas.TileLayer(layer);
};


/**
 * @classdesc
 * Events emitted by {@link ol.source.Raster} instances are instances of this
 * type.
 *
 * @constructor
 * @extends {ol.events.Event}
 * @implements {oli.source.RasterEvent}
 * @param {string} type Type.
 * @param {olx.FrameState} frameState The frame state.
 * @param {Object} data An object made available to operations.
 */
ol.source.RasterEvent = function(type, frameState, data) {
  ol.events.Event.call(this, type);

  /**
   * The raster extent.
   * @type {ol.Extent}
   * @api
   */
  this.extent = frameState.extent;

  /**
   * The pixel resolution (map units per pixel).
   * @type {number}
   * @api
   */
  this.resolution = frameState.viewState.resolution / frameState.pixelRatio;

  /**
   * An object made available to all operations.  This can be used by operations
   * as a storage object (e.g. for calculating statistics).
   * @type {Object}
   * @api
   */
  this.data = data;

};
ol.inherits(ol.source.RasterEvent, ol.events.Event);


/**
 * @enum {string}
 */
ol.source.RasterEventType = {
  /**
   * Triggered before operations are run.
   * @event ol.source.RasterEvent#beforeoperations
   * @api
   */
  BEFOREOPERATIONS: 'beforeoperations',

  /**
   * Triggered after operations are run.
   * @event ol.source.RasterEvent#afteroperations
   * @api
   */
  AFTEROPERATIONS: 'afteroperations'
};

goog.provide('ol.source.Stamen');

goog.require('ol');
goog.require('ol.Attribution');
goog.require('ol.source.OSM');
goog.require('ol.source.XYZ');


/**
 * @type {Object.<string, {extension: string, opaque: boolean}>}
 */
ol.source.StamenLayerConfig = {
  'terrain': {
    extension: 'jpg',
    opaque: true
  },
  'terrain-background': {
    extension: 'jpg',
    opaque: true
  },
  'terrain-labels': {
    extension: 'png',
    opaque: false
  },
  'terrain-lines': {
    extension: 'png',
    opaque: false
  },
  'toner-background': {
    extension: 'png',
    opaque: true
  },
  'toner': {
    extension: 'png',
    opaque: true
  },
  'toner-hybrid': {
    extension: 'png',
    opaque: false
  },
  'toner-labels': {
    extension: 'png',
    opaque: false
  },
  'toner-lines': {
    extension: 'png',
    opaque: false
  },
  'toner-lite': {
    extension: 'png',
    opaque: true
  },
  'watercolor': {
    extension: 'jpg',
    opaque: true
  }
};


/**
 * @type {Object.<string, {minZoom: number, maxZoom: number}>}
 */
ol.source.StamenProviderConfig = {
  'terrain': {
    minZoom: 4,
    maxZoom: 18
  },
  'toner': {
    minZoom: 0,
    maxZoom: 20
  },
  'watercolor': {
    minZoom: 1,
    maxZoom: 16
  }
};


/**
 * @classdesc
 * Layer source for the Stamen tile server.
 *
 * @constructor
 * @extends {ol.source.XYZ}
 * @param {olx.source.StamenOptions} options Stamen options.
 * @api stable
 */
ol.source.Stamen = function(options) {

  var i = options.layer.indexOf('-');
  var provider = i == -1 ? options.layer : options.layer.slice(0, i);
  goog.DEBUG && console.assert(provider in ol.source.StamenProviderConfig,
      'known provider configured');
  var providerConfig = ol.source.StamenProviderConfig[provider];

  goog.DEBUG && console.assert(options.layer in ol.source.StamenLayerConfig,
      'known layer configured');
  var layerConfig = ol.source.StamenLayerConfig[options.layer];

  var url = options.url !== undefined ? options.url :
      'https://stamen-tiles-{a-d}.a.ssl.fastly.net/' + options.layer +
      '/{z}/{x}/{y}.' + layerConfig.extension;

  ol.source.XYZ.call(this, {
    attributions: ol.source.Stamen.ATTRIBUTIONS,
    cacheSize: options.cacheSize,
    crossOrigin: 'anonymous',
    maxZoom: options.maxZoom != undefined ? options.maxZoom : providerConfig.maxZoom,
    minZoom: options.minZoom != undefined ? options.minZoom : providerConfig.minZoom,
    opaque: layerConfig.opaque,
    reprojectionErrorThreshold: options.reprojectionErrorThreshold,
    tileLoadFunction: options.tileLoadFunction,
    url: url
  });

};
ol.inherits(ol.source.Stamen, ol.source.XYZ);


/**
 * @const
 * @type {Array.<ol.Attribution>}
 */
ol.source.Stamen.ATTRIBUTIONS = [
  new ol.Attribution({
    html: 'Map tiles by <a href="http://stamen.com/">Stamen Design</a>, ' +
        'under <a href="http://creativecommons.org/licenses/by/3.0/">CC BY' +
        ' 3.0</a>.'
  }),
  ol.source.OSM.ATTRIBUTION
];

goog.provide('ol.source.TileArcGISRest');

goog.require('ol');
goog.require('ol.asserts');
goog.require('ol.extent');
goog.require('ol.math');
goog.require('ol.obj');
goog.require('ol.size');
goog.require('ol.source.TileImage');
goog.require('ol.tilecoord');
goog.require('ol.uri');


/**
 * @classdesc
 * Layer source for tile data from ArcGIS Rest services. Map and Image
 * Services are supported.
 *
 * For cached ArcGIS services, better performance is available using the
 * {@link ol.source.XYZ} data source.
 *
 * @constructor
 * @extends {ol.source.TileImage}
 * @param {olx.source.TileArcGISRestOptions=} opt_options Tile ArcGIS Rest
 *     options.
 * @api
 */
ol.source.TileArcGISRest = function(opt_options) {

  var options = opt_options || {};

  ol.source.TileImage.call(this, {
    attributions: options.attributions,
    cacheSize: options.cacheSize,
    crossOrigin: options.crossOrigin,
    logo: options.logo,
    projection: options.projection,
    reprojectionErrorThreshold: options.reprojectionErrorThreshold,
    tileGrid: options.tileGrid,
    tileLoadFunction: options.tileLoadFunction,
    url: options.url,
    urls: options.urls,
    wrapX: options.wrapX !== undefined ? options.wrapX : true
  });

  /**
   * @private
   * @type {!Object}
   */
  this.params_ = options.params || {};

  /**
   * @private
   * @type {ol.Extent}
   */
  this.tmpExtent_ = ol.extent.createEmpty();

};
ol.inherits(ol.source.TileArcGISRest, ol.source.TileImage);


/**
 * Get the user-provided params, i.e. those passed to the constructor through
 * the "params" option, and possibly updated using the updateParams method.
 * @return {Object} Params.
 * @api
 */
ol.source.TileArcGISRest.prototype.getParams = function() {
  return this.params_;
};


/**
 * @param {ol.TileCoord} tileCoord Tile coordinate.
 * @param {ol.Size} tileSize Tile size.
 * @param {ol.Extent} tileExtent Tile extent.
 * @param {number} pixelRatio Pixel ratio.
 * @param {ol.proj.Projection} projection Projection.
 * @param {Object} params Params.
 * @return {string|undefined} Request URL.
 * @private
 */
ol.source.TileArcGISRest.prototype.getRequestUrl_ = function(tileCoord, tileSize, tileExtent,
        pixelRatio, projection, params) {

  var urls = this.urls;
  if (!urls) {
    return undefined;
  }

  // ArcGIS Server only wants the numeric portion of the projection ID.
  var srid = projection.getCode().split(':').pop();

  params['SIZE'] = tileSize[0] + ',' + tileSize[1];
  params['BBOX'] = tileExtent.join(',');
  params['BBOXSR'] = srid;
  params['IMAGESR'] = srid;
  params['DPI'] = Math.round(
      params['DPI'] ? params['DPI'] * pixelRatio : 90 * pixelRatio
      );

  var url;
  if (urls.length == 1) {
    url = urls[0];
  } else {
    var index = ol.math.modulo(ol.tilecoord.hash(tileCoord), urls.length);
    url = urls[index];
  }

  var modifiedUrl = url
      .replace(/MapServer\/?$/, 'MapServer/export')
      .replace(/ImageServer\/?$/, 'ImageServer/exportImage');
  if (modifiedUrl == url) {
    ol.asserts.assert(false, 50); // Cannot determine Rest Service from url
  }
  return ol.uri.appendParams(modifiedUrl, params);
};


/**
 * @inheritDoc
 */
ol.source.TileArcGISRest.prototype.getTilePixelRatio = function(pixelRatio) {
  return /** @type {number} */ (pixelRatio);
};


/**
 * @inheritDoc
 */
ol.source.TileArcGISRest.prototype.fixedTileUrlFunction = function(tileCoord, pixelRatio, projection) {

  var tileGrid = this.getTileGrid();
  if (!tileGrid) {
    tileGrid = this.getTileGridForProjection(projection);
  }

  if (tileGrid.getResolutions().length <= tileCoord[0]) {
    return undefined;
  }

  var tileExtent = tileGrid.getTileCoordExtent(
      tileCoord, this.tmpExtent_);
  var tileSize = ol.size.toSize(
      tileGrid.getTileSize(tileCoord[0]), this.tmpSize);

  if (pixelRatio != 1) {
    tileSize = ol.size.scale(tileSize, pixelRatio, this.tmpSize);
  }

  // Apply default params and override with user specified values.
  var baseParams = {
    'F': 'image',
    'FORMAT': 'PNG32',
    'TRANSPARENT': true
  };
  ol.obj.assign(baseParams, this.params_);

  return this.getRequestUrl_(tileCoord, tileSize, tileExtent,
      pixelRatio, projection, baseParams);
};


/**
 * Update the user-provided params.
 * @param {Object} params Params.
 * @api stable
 */
ol.source.TileArcGISRest.prototype.updateParams = function(params) {
  ol.obj.assign(this.params_, params);
  this.changed();
};

goog.provide('ol.source.TileDebug');

goog.require('ol');
goog.require('ol.Tile');
goog.require('ol.dom');
goog.require('ol.size');
goog.require('ol.source.Tile');


/**
 * @constructor
 * @extends {ol.Tile}
 * @param {ol.TileCoord} tileCoord Tile coordinate.
 * @param {ol.Size} tileSize Tile size.
 * @param {string} text Text.
 * @private
 */
ol.DebugTile_ = function(tileCoord, tileSize, text) {

  ol.Tile.call(this, tileCoord, ol.Tile.State.LOADED);

  /**
   * @private
   * @type {ol.Size}
   */
  this.tileSize_ = tileSize;

  /**
   * @private
   * @type {string}
   */
  this.text_ = text;

  /**
   * @private
   * @type {Object.<number, HTMLCanvasElement>}
   */
  this.canvasByContext_ = {};

};
ol.inherits(ol.DebugTile_, ol.Tile);


/**
 * Get the image element for this tile.
 * @param {Object=} opt_context Optional context. Only used by the DOM
 *     renderer.
 * @return {HTMLCanvasElement} Image.
 */
ol.DebugTile_.prototype.getImage = function(opt_context) {
  var key = opt_context !== undefined ? ol.getUid(opt_context) : -1;
  if (key in this.canvasByContext_) {
    return this.canvasByContext_[key];
  } else {

    var tileSize = this.tileSize_;
    var context = ol.dom.createCanvasContext2D(tileSize[0], tileSize[1]);

    context.strokeStyle = 'black';
    context.strokeRect(0.5, 0.5, tileSize[0] + 0.5, tileSize[1] + 0.5);

    context.fillStyle = 'black';
    context.textAlign = 'center';
    context.textBaseline = 'middle';
    context.font = '24px sans-serif';
    context.fillText(this.text_, tileSize[0] / 2, tileSize[1] / 2);

    this.canvasByContext_[key] = context.canvas;
    return context.canvas;

  }
};


/**
 * @classdesc
 * A pseudo tile source, which does not fetch tiles from a server, but renders
 * a grid outline for the tile grid/projection along with the coordinates for
 * each tile. See examples/canvas-tiles for an example.
 *
 * Uses Canvas context2d, so requires Canvas support.
 *
 * @constructor
 * @extends {ol.source.Tile}
 * @param {olx.source.TileDebugOptions} options Debug tile options.
 * @api
 */
ol.source.TileDebug = function(options) {

  ol.source.Tile.call(this, {
    opaque: false,
    projection: options.projection,
    tileGrid: options.tileGrid,
    wrapX: options.wrapX !== undefined ? options.wrapX : true
  });

};
ol.inherits(ol.source.TileDebug, ol.source.Tile);


/**
 * @inheritDoc
 */
ol.source.TileDebug.prototype.getTile = function(z, x, y) {
  var tileCoordKey = this.getKeyZXY(z, x, y);
  if (this.tileCache.containsKey(tileCoordKey)) {
    return /** @type {!ol.DebugTile_} */ (this.tileCache.get(tileCoordKey));
  } else {
    var tileSize = ol.size.toSize(this.tileGrid.getTileSize(z));
    var tileCoord = [z, x, y];
    var textTileCoord = this.getTileCoordForTileUrlFunction(tileCoord);
    var text = !textTileCoord ? '' :
        this.getTileCoordForTileUrlFunction(textTileCoord).toString();
    var tile = new ol.DebugTile_(tileCoord, tileSize, text);
    this.tileCache.set(tileCoordKey, tile);
    return tile;
  }
};

// FIXME check order of async callbacks

/**
 * @see http://mapbox.com/developers/api/
 */

goog.provide('ol.source.TileJSON');
goog.provide('ol.tilejson');

goog.require('ol');
goog.require('ol.Attribution');
goog.require('ol.TileUrlFunction');
goog.require('ol.extent');
goog.require('ol.net');
goog.require('ol.proj');
goog.require('ol.source.State');
goog.require('ol.source.TileImage');
goog.require('ol.tilegrid');


/**
 * @classdesc
 * Layer source for tile data in TileJSON format.
 *
 * @constructor
 * @extends {ol.source.TileImage}
 * @param {olx.source.TileJSONOptions} options TileJSON options.
 * @api stable
 */
ol.source.TileJSON = function(options) {

  /**
   * @type {TileJSON}
   * @private
   */
  this.tileJSON_ = null;

  ol.source.TileImage.call(this, {
    attributions: options.attributions,
    cacheSize: options.cacheSize,
    crossOrigin: options.crossOrigin,
    projection: ol.proj.get('EPSG:3857'),
    reprojectionErrorThreshold: options.reprojectionErrorThreshold,
    state: ol.source.State.LOADING,
    tileLoadFunction: options.tileLoadFunction,
    wrapX: options.wrapX !== undefined ? options.wrapX : true
  });

  if (options.jsonp) {
    ol.net.jsonp(options.url, this.handleTileJSONResponse.bind(this),
        this.handleTileJSONError.bind(this));
  } else {
    var client = new XMLHttpRequest();
    client.addEventListener('load', this.onXHRLoad_.bind(this));
    client.addEventListener('error', this.onXHRError_.bind(this));
    client.open('GET', options.url);
    client.send();
  }

};
ol.inherits(ol.source.TileJSON, ol.source.TileImage);


/**
 * @private
 * @param {Event} event The load event.
 */
ol.source.TileJSON.prototype.onXHRLoad_ = function(event) {
  var client = /** @type {XMLHttpRequest} */ (event.target);
  // status will be 0 for file:// urls
  if (!client.status || client.status >= 200 && client.status < 300) {
    var response;
    try {
      response = /** @type {TileJSON} */(JSON.parse(client.responseText));
    } catch (err) {
      this.handleTileJSONError();
      return;
    }
    this.handleTileJSONResponse(response);
  } else {
    this.handleTileJSONError();
  }
};


/**
 * @private
 * @param {Event} event The error event.
 */
ol.source.TileJSON.prototype.onXHRError_ = function(event) {
  this.handleTileJSONError();
};


/**
 * @return {TileJSON} The tilejson object.
 * @api
 */
ol.source.TileJSON.prototype.getTileJSON = function() {
  return this.tileJSON_;
};


/**
 * @protected
 * @param {TileJSON} tileJSON Tile JSON.
 */
ol.source.TileJSON.prototype.handleTileJSONResponse = function(tileJSON) {

  var epsg4326Projection = ol.proj.get('EPSG:4326');

  var sourceProjection = this.getProjection();
  var extent;
  if (tileJSON.bounds !== undefined) {
    var transform = ol.proj.getTransformFromProjections(
        epsg4326Projection, sourceProjection);
    extent = ol.extent.applyTransform(tileJSON.bounds, transform);
  }

  if (tileJSON.scheme !== undefined) {
    goog.DEBUG && console.assert(tileJSON.scheme == 'xyz', 'tileJSON-scheme is "xyz"');
  }
  var minZoom = tileJSON.minzoom || 0;
  var maxZoom = tileJSON.maxzoom || 22;
  var tileGrid = ol.tilegrid.createXYZ({
    extent: ol.tilegrid.extentFromProjection(sourceProjection),
    maxZoom: maxZoom,
    minZoom: minZoom
  });
  this.tileGrid = tileGrid;

  this.tileUrlFunction =
      ol.TileUrlFunction.createFromTemplates(tileJSON.tiles, tileGrid);

  if (tileJSON.attribution !== undefined && !this.getAttributions()) {
    var attributionExtent = extent !== undefined ?
        extent : epsg4326Projection.getExtent();
    /** @type {Object.<string, Array.<ol.TileRange>>} */
    var tileRanges = {};
    var z, zKey;
    for (z = minZoom; z <= maxZoom; ++z) {
      zKey = z.toString();
      tileRanges[zKey] =
          [tileGrid.getTileRangeForExtentAndZ(attributionExtent, z)];
    }
    this.setAttributions([
      new ol.Attribution({
        html: tileJSON.attribution,
        tileRanges: tileRanges
      })
    ]);
  }
  this.tileJSON_ = tileJSON;
  this.setState(ol.source.State.READY);

};


/**
 * @protected
 */
ol.source.TileJSON.prototype.handleTileJSONError = function() {
  this.setState(ol.source.State.ERROR);
};

goog.provide('ol.source.TileUTFGrid');

goog.require('goog.async.nextTick');
goog.require('ol');
goog.require('ol.Attribution');
goog.require('ol.Tile');
goog.require('ol.TileUrlFunction');
goog.require('ol.asserts');
goog.require('ol.events');
goog.require('ol.events.EventType');
goog.require('ol.extent');
goog.require('ol.net');
goog.require('ol.proj');
goog.require('ol.source.State');
goog.require('ol.source.Tile');
goog.require('ol.tilegrid');


/**
 * @classdesc
 * Layer source for UTFGrid interaction data loaded from TileJSON format.
 *
 * @constructor
 * @extends {ol.source.Tile}
 * @param {olx.source.TileUTFGridOptions} options Source options.
 * @api
 */
ol.source.TileUTFGrid = function(options) {
  ol.source.Tile.call(this, {
    projection: ol.proj.get('EPSG:3857'),
    state: ol.source.State.LOADING
  });

  /**
   * @private
   * @type {boolean}
   */
  this.preemptive_ = options.preemptive !== undefined ?
      options.preemptive : true;

  /**
   * @private
   * @type {!ol.TileUrlFunctionType}
   */
  this.tileUrlFunction_ = ol.TileUrlFunction.nullTileUrlFunction;

  /**
   * @private
   * @type {string|undefined}
   */
  this.template_ = undefined;

  /**
   * @private
   * @type {boolean}
   */
  this.jsonp_ = options.jsonp || false;

  if (options.url) {
    if (this.jsonp_) {
      ol.net.jsonp(options.url, this.handleTileJSONResponse.bind(this),
          this.handleTileJSONError.bind(this));
    } else {
      var client = new XMLHttpRequest();
      client.addEventListener('load', this.onXHRLoad_.bind(this));
      client.addEventListener('error', this.onXHRError_.bind(this));
      client.open('GET', options.url);
      client.send();
    }
  } else if (options.tileJSON) {
    this.handleTileJSONResponse(options.tileJSON);
  } else {
    ol.asserts.assert(false, 51); // Either `url` or `tileJSON` options must be provided
  }
};
ol.inherits(ol.source.TileUTFGrid, ol.source.Tile);


/**
 * @private
 * @param {Event} event The load event.
 */
ol.source.TileUTFGrid.prototype.onXHRLoad_ = function(event) {
  var client = /** @type {XMLHttpRequest} */ (event.target);
  // status will be 0 for file:// urls
  if (!client.status || client.status >= 200 && client.status < 300) {
    var response;
    try {
      response = /** @type {TileJSON} */(JSON.parse(client.responseText));
    } catch (err) {
      this.handleTileJSONError();
      return;
    }
    this.handleTileJSONResponse(response);
  } else {
    this.handleTileJSONError();
  }
};


/**
 * @private
 * @param {Event} event The error event.
 */
ol.source.TileUTFGrid.prototype.onXHRError_ = function(event) {
  this.handleTileJSONError();
};


/**
 * Return the template from TileJSON.
 * @return {string|undefined} The template from TileJSON.
 * @api
 */
ol.source.TileUTFGrid.prototype.getTemplate = function() {
  return this.template_;
};


/**
 * Calls the callback (synchronously by default) with the available data
 * for given coordinate and resolution (or `null` if not yet loaded or
 * in case of an error).
 * @param {ol.Coordinate} coordinate Coordinate.
 * @param {number} resolution Resolution.
 * @param {function(this: T, *)} callback Callback.
 * @param {T=} opt_this The object to use as `this` in the callback.
 * @param {boolean=} opt_request If `true` the callback is always async.
 *                               The tile data is requested if not yet loaded.
 * @template T
 * @api
 */
ol.source.TileUTFGrid.prototype.forDataAtCoordinateAndResolution = function(
    coordinate, resolution, callback, opt_this, opt_request) {
  if (this.tileGrid) {
    var tileCoord = this.tileGrid.getTileCoordForCoordAndResolution(
        coordinate, resolution);
    var tile = /** @type {!ol.source.TileUTFGridTile_} */(this.getTile(
        tileCoord[0], tileCoord[1], tileCoord[2], 1, this.getProjection()));
    tile.forDataAtCoordinate(coordinate, callback, opt_this, opt_request);
  } else {
    if (opt_request === true) {
      goog.async.nextTick(function() {
        callback.call(opt_this, null);
      });
    } else {
      callback.call(opt_this, null);
    }
  }
};


/**
 * @protected
 */
ol.source.TileUTFGrid.prototype.handleTileJSONError = function() {
  this.setState(ol.source.State.ERROR);
};


/**
 * TODO: very similar to ol.source.TileJSON#handleTileJSONResponse
 * @protected
 * @param {TileJSON} tileJSON Tile JSON.
 */
ol.source.TileUTFGrid.prototype.handleTileJSONResponse = function(tileJSON) {

  var epsg4326Projection = ol.proj.get('EPSG:4326');

  var sourceProjection = this.getProjection();
  var extent;
  if (tileJSON.bounds !== undefined) {
    var transform = ol.proj.getTransformFromProjections(
        epsg4326Projection, sourceProjection);
    extent = ol.extent.applyTransform(tileJSON.bounds, transform);
  }

  if (tileJSON.scheme !== undefined) {
    goog.DEBUG && console.assert(tileJSON.scheme == 'xyz', 'tileJSON-scheme is "xyz"');
  }
  var minZoom = tileJSON.minzoom || 0;
  var maxZoom = tileJSON.maxzoom || 22;
  var tileGrid = ol.tilegrid.createXYZ({
    extent: ol.tilegrid.extentFromProjection(sourceProjection),
    maxZoom: maxZoom,
    minZoom: minZoom
  });
  this.tileGrid = tileGrid;

  this.template_ = tileJSON.template;

  var grids = tileJSON.grids;
  if (!grids) {
    this.setState(ol.source.State.ERROR);
    return;
  }

  this.tileUrlFunction_ =
      ol.TileUrlFunction.createFromTemplates(grids, tileGrid);

  if (tileJSON.attribution !== undefined) {
    var attributionExtent = extent !== undefined ?
        extent : epsg4326Projection.getExtent();
    /** @type {Object.<string, Array.<ol.TileRange>>} */
    var tileRanges = {};
    var z, zKey;
    for (z = minZoom; z <= maxZoom; ++z) {
      zKey = z.toString();
      tileRanges[zKey] =
          [tileGrid.getTileRangeForExtentAndZ(attributionExtent, z)];
    }
    this.setAttributions([
      new ol.Attribution({
        html: tileJSON.attribution,
        tileRanges: tileRanges
      })
    ]);
  }

  this.setState(ol.source.State.READY);

};


/**
 * @inheritDoc
 */
ol.source.TileUTFGrid.prototype.getTile = function(z, x, y, pixelRatio, projection) {
  var tileCoordKey = this.getKeyZXY(z, x, y);
  if (this.tileCache.containsKey(tileCoordKey)) {
    return /** @type {!ol.Tile} */ (this.tileCache.get(tileCoordKey));
  } else {
    goog.DEBUG && console.assert(projection, 'argument projection is truthy');
    var tileCoord = [z, x, y];
    var urlTileCoord =
        this.getTileCoordForTileUrlFunction(tileCoord, projection);
    var tileUrl = this.tileUrlFunction_(urlTileCoord, pixelRatio, projection);
    var tile = new ol.source.TileUTFGridTile_(
        tileCoord,
        tileUrl !== undefined ? ol.Tile.State.IDLE : ol.Tile.State.EMPTY,
        tileUrl !== undefined ? tileUrl : '',
        this.tileGrid.getTileCoordExtent(tileCoord),
        this.preemptive_,
        this.jsonp_);
    this.tileCache.set(tileCoordKey, tile);
    return tile;
  }
};


/**
 * @inheritDoc
 */
ol.source.TileUTFGrid.prototype.useTile = function(z, x, y) {
  var tileCoordKey = this.getKeyZXY(z, x, y);
  if (this.tileCache.containsKey(tileCoordKey)) {
    this.tileCache.get(tileCoordKey);
  }
};


/**
 * @constructor
 * @extends {ol.Tile}
 * @param {ol.TileCoord} tileCoord Tile coordinate.
 * @param {ol.Tile.State} state State.
 * @param {string} src Image source URI.
 * @param {ol.Extent} extent Extent of the tile.
 * @param {boolean} preemptive Load the tile when visible (before it's needed).
 * @param {boolean} jsonp Load the tile as a script.
 * @private
 */
ol.source.TileUTFGridTile_ = function(tileCoord, state, src, extent, preemptive, jsonp) {

  ol.Tile.call(this, tileCoord, state);

  /**
   * @private
   * @type {string}
   */
  this.src_ = src;

  /**
   * @private
   * @type {ol.Extent}
   */
  this.extent_ = extent;

  /**
   * @private
   * @type {boolean}
   */
  this.preemptive_ = preemptive;

  /**
   * @private
   * @type {Array.<string>}
   */
  this.grid_ = null;

  /**
   * @private
   * @type {Array.<string>}
   */
  this.keys_ = null;

  /**
   * @private
   * @type {Object.<string, Object>|undefined}
   */
  this.data_ = null;


  /**
   * @private
   * @type {boolean}
   */
  this.jsonp_ = jsonp;

};
ol.inherits(ol.source.TileUTFGridTile_, ol.Tile);


/**
 * Get the image element for this tile.
 * @param {Object=} opt_context Optional context. Only used for the DOM
 *     renderer.
 * @return {Image} Image.
 */
ol.source.TileUTFGridTile_.prototype.getImage = function(opt_context) {
  return null;
};


/**
 * Synchronously returns data at given coordinate (if available).
 * @param {ol.Coordinate} coordinate Coordinate.
 * @return {*} The data.
 */
ol.source.TileUTFGridTile_.prototype.getData = function(coordinate) {
  if (!this.grid_ || !this.keys_) {
    return null;
  }
  var xRelative = (coordinate[0] - this.extent_[0]) /
      (this.extent_[2] - this.extent_[0]);
  var yRelative = (coordinate[1] - this.extent_[1]) /
      (this.extent_[3] - this.extent_[1]);

  var row = this.grid_[Math.floor((1 - yRelative) * this.grid_.length)];

  if (typeof row !== 'string') {
    return null;
  }

  var code = row.charCodeAt(Math.floor(xRelative * row.length));
  if (code >= 93) {
    code--;
  }
  if (code >= 35) {
    code--;
  }
  code -= 32;

  var data = null;
  if (code in this.keys_) {
    var id = this.keys_[code];
    if (this.data_ && id in this.data_) {
      data = this.data_[id];
    } else {
      data = id;
    }
  }
  return data;
};


/**
 * Calls the callback (synchronously by default) with the available data
 * for given coordinate (or `null` if not yet loaded).
 * @param {ol.Coordinate} coordinate Coordinate.
 * @param {function(this: T, *)} callback Callback.
 * @param {T=} opt_this The object to use as `this` in the callback.
 * @param {boolean=} opt_request If `true` the callback is always async.
 *                               The tile data is requested if not yet loaded.
 * @template T
 */
ol.source.TileUTFGridTile_.prototype.forDataAtCoordinate = function(coordinate, callback, opt_this, opt_request) {
  if (this.state == ol.Tile.State.IDLE && opt_request === true) {
    ol.events.listenOnce(this, ol.events.EventType.CHANGE, function(e) {
      callback.call(opt_this, this.getData(coordinate));
    }, this);
    this.loadInternal_();
  } else {
    if (opt_request === true) {
      goog.async.nextTick(function() {
        callback.call(opt_this, this.getData(coordinate));
      }, this);
    } else {
      callback.call(opt_this, this.getData(coordinate));
    }
  }
};


/**
 * @inheritDoc
 */
ol.source.TileUTFGridTile_.prototype.getKey = function() {
  return this.src_;
};


/**
 * @private
 */
ol.source.TileUTFGridTile_.prototype.handleError_ = function() {
  this.state = ol.Tile.State.ERROR;
  this.changed();
};


/**
 * @param {!UTFGridJSON} json UTFGrid data.
 * @private
 */
ol.source.TileUTFGridTile_.prototype.handleLoad_ = function(json) {
  this.grid_ = json.grid;
  this.keys_ = json.keys;
  this.data_ = json.data;

  this.state = ol.Tile.State.EMPTY;
  this.changed();
};


/**
 * @private
 */
ol.source.TileUTFGridTile_.prototype.loadInternal_ = function() {
  if (this.state == ol.Tile.State.IDLE) {
    this.state = ol.Tile.State.LOADING;
    if (this.jsonp_) {
      ol.net.jsonp(this.src_, this.handleLoad_.bind(this),
          this.handleError_.bind(this));
    } else {
      var client = new XMLHttpRequest();
      client.addEventListener('load', this.onXHRLoad_.bind(this));
      client.addEventListener('error', this.onXHRError_.bind(this));
      client.open('GET', this.src_);
      client.send();
    }
  }
};


/**
 * @private
 * @param {Event} event The load event.
 */
ol.source.TileUTFGridTile_.prototype.onXHRLoad_ = function(event) {
  var client = /** @type {XMLHttpRequest} */ (event.target);
  // status will be 0 for file:// urls
  if (!client.status || client.status >= 200 && client.status < 300) {
    var response;
    try {
      response = /** @type {!UTFGridJSON} */(JSON.parse(client.responseText));
    } catch (err) {
      this.handleError_();
      return;
    }
    this.handleLoad_(response);
  } else {
    this.handleError_();
  }
};


/**
 * @private
 * @param {Event} event The error event.
 */
ol.source.TileUTFGridTile_.prototype.onXHRError_ = function(event) {
  this.handleError_();
};


/**
 * Load not yet loaded URI.
 */
ol.source.TileUTFGridTile_.prototype.load = function() {
  if (this.preemptive_) {
    this.loadInternal_();
  }
};

// FIXME add minZoom support
// FIXME add date line wrap (tile coord transform)
// FIXME cannot be shared between maps with different projections

goog.provide('ol.source.TileWMS');

goog.require('ol');
goog.require('ol.asserts');
goog.require('ol.extent');
goog.require('ol.obj');
goog.require('ol.math');
goog.require('ol.proj');
goog.require('ol.size');
goog.require('ol.source.TileImage');
goog.require('ol.source.wms.ServerType');
goog.require('ol.tilecoord');
goog.require('ol.string');
goog.require('ol.uri');

/**
 * @classdesc
 * Layer source for tile data from WMS servers.
 *
 * @constructor
 * @extends {ol.source.TileImage}
 * @param {olx.source.TileWMSOptions=} opt_options Tile WMS options.
 * @api stable
 */
ol.source.TileWMS = function(opt_options) {

  var options = opt_options || {};

  var params = options.params || {};

  var transparent = 'TRANSPARENT' in params ? params['TRANSPARENT'] : true;

  ol.source.TileImage.call(this, {
    attributions: options.attributions,
    cacheSize: options.cacheSize,
    crossOrigin: options.crossOrigin,
    logo: options.logo,
    opaque: !transparent,
    projection: options.projection,
    reprojectionErrorThreshold: options.reprojectionErrorThreshold,
    tileGrid: options.tileGrid,
    tileLoadFunction: options.tileLoadFunction,
    url: options.url,
    urls: options.urls,
    wrapX: options.wrapX !== undefined ? options.wrapX : true
  });

  /**
   * @private
   * @type {number}
   */
  this.gutter_ = options.gutter !== undefined ? options.gutter : 0;

  /**
   * @private
   * @type {!Object}
   */
  this.params_ = params;

  /**
   * @private
   * @type {boolean}
   */
  this.v13_ = true;

  /**
   * @private
   * @type {ol.source.wms.ServerType|undefined}
   */
  this.serverType_ =
      /** @type {ol.source.wms.ServerType|undefined} */ (options.serverType);

  /**
   * @private
   * @type {boolean}
   */
  this.hidpi_ = options.hidpi !== undefined ? options.hidpi : true;

  /**
   * @private
   * @type {string}
   */
  this.coordKeyPrefix_ = '';
  this.resetCoordKeyPrefix_();

  /**
   * @private
   * @type {ol.Extent}
   */
  this.tmpExtent_ = ol.extent.createEmpty();

  this.updateV13_();
  this.setKey(this.getKeyForParams_());

};
ol.inherits(ol.source.TileWMS, ol.source.TileImage);


/**
 * Return the GetFeatureInfo URL for the passed coordinate, resolution, and
 * projection. Return `undefined` if the GetFeatureInfo URL cannot be
 * constructed.
 * @param {ol.Coordinate} coordinate Coordinate.
 * @param {number} resolution Resolution.
 * @param {ol.ProjectionLike} projection Projection.
 * @param {!Object} params GetFeatureInfo params. `INFO_FORMAT` at least should
 *     be provided. If `QUERY_LAYERS` is not provided then the layers specified
 *     in the `LAYERS` parameter will be used. `VERSION` should not be
 *     specified here.
 * @return {string|undefined} GetFeatureInfo URL.
 * @api stable
 */
ol.source.TileWMS.prototype.getGetFeatureInfoUrl = function(coordinate, resolution, projection, params) {

  goog.DEBUG && console.assert(!('VERSION' in params),
      'key VERSION is not allowed in params');

  var projectionObj = ol.proj.get(projection);

  var tileGrid = this.getTileGrid();
  if (!tileGrid) {
    tileGrid = this.getTileGridForProjection(projectionObj);
  }

  var tileCoord = tileGrid.getTileCoordForCoordAndResolution(
      coordinate, resolution);

  if (tileGrid.getResolutions().length <= tileCoord[0]) {
    return undefined;
  }

  var tileResolution = tileGrid.getResolution(tileCoord[0]);
  var tileExtent = tileGrid.getTileCoordExtent(tileCoord, this.tmpExtent_);
  var tileSize = ol.size.toSize(
      tileGrid.getTileSize(tileCoord[0]), this.tmpSize);

  var gutter = this.gutter_;
  if (gutter !== 0) {
    tileSize = ol.size.buffer(tileSize, gutter, this.tmpSize);
    tileExtent = ol.extent.buffer(tileExtent,
        tileResolution * gutter, tileExtent);
  }

  var baseParams = {
    'SERVICE': 'WMS',
    'VERSION': ol.DEFAULT_WMS_VERSION,
    'REQUEST': 'GetFeatureInfo',
    'FORMAT': 'image/png',
    'TRANSPARENT': true,
    'QUERY_LAYERS': this.params_['LAYERS']
  };
  ol.obj.assign(baseParams, this.params_, params);

  var x = Math.floor((coordinate[0] - tileExtent[0]) / tileResolution);
  var y = Math.floor((tileExtent[3] - coordinate[1]) / tileResolution);

  baseParams[this.v13_ ? 'I' : 'X'] = x;
  baseParams[this.v13_ ? 'J' : 'Y'] = y;

  return this.getRequestUrl_(tileCoord, tileSize, tileExtent,
      1, projectionObj, baseParams);
};


/**
 * @inheritDoc
 */
ol.source.TileWMS.prototype.getGutterInternal = function() {
  return this.gutter_;
};


/**
 * @inheritDoc
 */
ol.source.TileWMS.prototype.getKeyZXY = function(z, x, y) {
  return this.coordKeyPrefix_ + ol.source.TileImage.prototype.getKeyZXY.call(this, z, x, y);
};


/**
 * Get the user-provided params, i.e. those passed to the constructor through
 * the "params" option, and possibly updated using the updateParams method.
 * @return {Object} Params.
 * @api stable
 */
ol.source.TileWMS.prototype.getParams = function() {
  return this.params_;
};


/**
 * @param {ol.TileCoord} tileCoord Tile coordinate.
 * @param {ol.Size} tileSize Tile size.
 * @param {ol.Extent} tileExtent Tile extent.
 * @param {number} pixelRatio Pixel ratio.
 * @param {ol.proj.Projection} projection Projection.
 * @param {Object} params Params.
 * @return {string|undefined} Request URL.
 * @private
 */
ol.source.TileWMS.prototype.getRequestUrl_ = function(tileCoord, tileSize, tileExtent,
        pixelRatio, projection, params) {

  var urls = this.urls;
  if (!urls) {
    return undefined;
  }

  params['WIDTH'] = tileSize[0];
  params['HEIGHT'] = tileSize[1];

  params[this.v13_ ? 'CRS' : 'SRS'] = projection.getCode();

  if (!('STYLES' in this.params_)) {
    params['STYLES'] = '';
  }

  if (pixelRatio != 1) {
    switch (this.serverType_) {
      case ol.source.wms.ServerType.GEOSERVER:
        var dpi = (90 * pixelRatio + 0.5) | 0;
        if ('FORMAT_OPTIONS' in params) {
          params['FORMAT_OPTIONS'] += ';dpi:' + dpi;
        } else {
          params['FORMAT_OPTIONS'] = 'dpi:' + dpi;
        }
        break;
      case ol.source.wms.ServerType.MAPSERVER:
        params['MAP_RESOLUTION'] = 90 * pixelRatio;
        break;
      case ol.source.wms.ServerType.CARMENTA_SERVER:
      case ol.source.wms.ServerType.QGIS:
        params['DPI'] = 90 * pixelRatio;
        break;
      default:
        ol.asserts.assert(false, 52); // Unknown `serverType` configured
        break;
    }
  }

  var axisOrientation = projection.getAxisOrientation();
  var bbox = tileExtent;
  if (this.v13_ && axisOrientation.substr(0, 2) == 'ne') {
    var tmp;
    tmp = tileExtent[0];
    bbox[0] = tileExtent[1];
    bbox[1] = tmp;
    tmp = tileExtent[2];
    bbox[2] = tileExtent[3];
    bbox[3] = tmp;
  }
  params['BBOX'] = bbox.join(',');

  var url;
  if (urls.length == 1) {
    url = urls[0];
  } else {
    var index = ol.math.modulo(ol.tilecoord.hash(tileCoord), urls.length);
    url = urls[index];
  }
  return ol.uri.appendParams(url, params);
};


/**
 * @inheritDoc
 */
ol.source.TileWMS.prototype.getTilePixelRatio = function(pixelRatio) {
  return (!this.hidpi_ || this.serverType_ === undefined) ? 1 :
      /** @type {number} */ (pixelRatio);
};


/**
 * @private
 */
ol.source.TileWMS.prototype.resetCoordKeyPrefix_ = function() {
  var i = 0;
  var res = [];

  if (this.urls) {
    var j, jj;
    for (j = 0, jj = this.urls.length; j < jj; ++j) {
      res[i++] = this.urls[j];
    }
  }

  this.coordKeyPrefix_ = res.join('#');
};


/**
 * @private
 * @return {string} The key for the current params.
 */
ol.source.TileWMS.prototype.getKeyForParams_ = function() {
  var i = 0;
  var res = [];
  for (var key in this.params_) {
    res[i++] = key + '-' + this.params_[key];
  }
  return res.join('/');
};


/**
 * @inheritDoc
 */
ol.source.TileWMS.prototype.fixedTileUrlFunction = function(tileCoord, pixelRatio, projection) {

  var tileGrid = this.getTileGrid();
  if (!tileGrid) {
    tileGrid = this.getTileGridForProjection(projection);
  }

  if (tileGrid.getResolutions().length <= tileCoord[0]) {
    return undefined;
  }

  if (pixelRatio != 1 && (!this.hidpi_ || this.serverType_ === undefined)) {
    pixelRatio = 1;
  }

  var tileResolution = tileGrid.getResolution(tileCoord[0]);
  var tileExtent = tileGrid.getTileCoordExtent(tileCoord, this.tmpExtent_);
  var tileSize = ol.size.toSize(
      tileGrid.getTileSize(tileCoord[0]), this.tmpSize);

  var gutter = this.gutter_;
  if (gutter !== 0) {
    tileSize = ol.size.buffer(tileSize, gutter, this.tmpSize);
    tileExtent = ol.extent.buffer(tileExtent,
        tileResolution * gutter, tileExtent);
  }

  if (pixelRatio != 1) {
    tileSize = ol.size.scale(tileSize, pixelRatio, this.tmpSize);
  }

  var baseParams = {
    'SERVICE': 'WMS',
    'VERSION': ol.DEFAULT_WMS_VERSION,
    'REQUEST': 'GetMap',
    'FORMAT': 'image/png',
    'TRANSPARENT': true
  };
  ol.obj.assign(baseParams, this.params_);

  return this.getRequestUrl_(tileCoord, tileSize, tileExtent,
      pixelRatio, projection, baseParams);
};

/**
 * @inheritDoc
 */
ol.source.TileWMS.prototype.setUrls = function(urls) {
  ol.source.TileImage.prototype.setUrls.call(this, urls);
  this.resetCoordKeyPrefix_();
};


/**
 * Update the user-provided params.
 * @param {Object} params Params.
 * @api stable
 */
ol.source.TileWMS.prototype.updateParams = function(params) {
  ol.obj.assign(this.params_, params);
  this.resetCoordKeyPrefix_();
  this.updateV13_();
  this.setKey(this.getKeyForParams_());
};


/**
 * @private
 */
ol.source.TileWMS.prototype.updateV13_ = function() {
  var version = this.params_['VERSION'] || ol.DEFAULT_WMS_VERSION;
  this.v13_ = ol.string.compareVersions(version, '1.3') >= 0;
};

goog.provide('ol.VectorTile');

goog.require('ol');
goog.require('ol.Tile');
goog.require('ol.dom');


/**
 * @constructor
 * @extends {ol.Tile}
 * @param {ol.TileCoord} tileCoord Tile coordinate.
 * @param {ol.Tile.State} state State.
 * @param {string} src Data source url.
 * @param {ol.format.Feature} format Feature format.
 * @param {ol.TileLoadFunctionType} tileLoadFunction Tile load function.
 */
ol.VectorTile = function(tileCoord, state, src, format, tileLoadFunction) {

  ol.Tile.call(this, tileCoord, state);

  /**
   * @private
   * @type {CanvasRenderingContext2D}
   */
  this.context_ = ol.dom.createCanvasContext2D();

  /**
   * @private
   * @type {ol.format.Feature}
   */
  this.format_ = format;

  /**
   * @private
   * @type {Array.<ol.Feature>}
   */
  this.features_ = null;

  /**
   * @private
   * @type {ol.FeatureLoader}
   */
  this.loader_;

  /**
   * Data projection
   * @private
   * @type {ol.proj.Projection}
   */
  this.projection_;

  /**
   * @private
   * @type {ol.TileReplayState}
   */
  this.replayState_ = {
    dirty: false,
    renderedRenderOrder: null,
    renderedRevision: -1,
    renderedTileRevision: -1,
    replayGroup: null,
    skippedFeatures: []
  };

  /**
   * @private
   * @type {ol.TileLoadFunctionType}
   */
  this.tileLoadFunction_ = tileLoadFunction;

  /**
   * @private
   * @type {string}
   */
  this.url_ = src;

};
ol.inherits(ol.VectorTile, ol.Tile);


/**
 * @return {CanvasRenderingContext2D} The rendering context.
 */
ol.VectorTile.prototype.getContext = function() {
  return this.context_;
};


/**
 * @inheritDoc
 */
ol.VectorTile.prototype.getImage = function() {
  return this.replayState_.renderedTileRevision == -1 ?
      null : this.context_.canvas;
};


/**
 * Get the feature format assigned for reading this tile's features.
 * @return {ol.format.Feature} Feature format.
 * @api
 */
ol.VectorTile.prototype.getFormat = function() {
  return this.format_;
};


/**
 * @return {Array.<ol.Feature>} Features.
 */
ol.VectorTile.prototype.getFeatures = function() {
  return this.features_;
};


/**
 * @return {ol.TileReplayState} The replay state.
 */
ol.VectorTile.prototype.getReplayState = function() {
  return this.replayState_;
};


/**
 * @inheritDoc
 */
ol.VectorTile.prototype.getKey = function() {
  return this.url_;
};


/**
 * @return {ol.proj.Projection} Feature projection.
 */
ol.VectorTile.prototype.getProjection = function() {
  return this.projection_;
};


/**
 * Load the tile.
 */
ol.VectorTile.prototype.load = function() {
  if (this.state == ol.Tile.State.IDLE) {
    this.setState(ol.Tile.State.LOADING);
    this.tileLoadFunction_(this, this.url_);
    this.loader_(null, NaN, null);
  }
};


/**
 * @param {Array.<ol.Feature>} features Features.
 * @api
 */
ol.VectorTile.prototype.setFeatures = function(features) {
  this.features_ = features;
  this.setState(ol.Tile.State.LOADED);
};


/**
 * Set the projection of the features that were added with {@link #setFeatures}.
 * @param {ol.proj.Projection} projection Feature projection.
 * @api
 */
ol.VectorTile.prototype.setProjection = function(projection) {
  this.projection_ = projection;
};


/**
 * @param {ol.Tile.State} tileState Tile state.
 */
ol.VectorTile.prototype.setState = function(tileState) {
  this.state = tileState;
  this.changed();
};


/**
 * Set the feature loader for reading this tile's features.
 * @param {ol.FeatureLoader} loader Feature loader.
 * @api
 */
ol.VectorTile.prototype.setLoader = function(loader) {
  this.loader_ = loader;
};

goog.provide('ol.source.VectorTile');

goog.require('ol');
goog.require('ol.Tile');
goog.require('ol.VectorTile');
goog.require('ol.events');
goog.require('ol.events.EventType');
goog.require('ol.featureloader');
goog.require('ol.size');
goog.require('ol.source.UrlTile');


/**
 * @classdesc
 * Class for layer sources providing vector data divided into a tile grid, to be
 * used with {@link ol.layer.VectorTile}. Although this source receives tiles
 * with vector features from the server, it is not meant for feature editing.
 * Features are optimized for rendering, their geometries are clipped at or near
 * tile boundaries and simplified for a view resolution. See
 * {@link ol.source.Vector} for vector sources that are suitable for feature
 * editing.
 *
 * @constructor
 * @fires ol.source.TileEvent
 * @extends {ol.source.UrlTile}
 * @param {olx.source.VectorTileOptions} options Vector tile options.
 * @api
 */
ol.source.VectorTile = function(options) {

  ol.source.UrlTile.call(this, {
    attributions: options.attributions,
    cacheSize: options.cacheSize !== undefined ? options.cacheSize : 128,
    extent: options.extent,
    logo: options.logo,
    opaque: false,
    projection: options.projection,
    state: options.state,
    tileGrid: options.tileGrid,
    tileLoadFunction: options.tileLoadFunction ?
        options.tileLoadFunction : ol.source.VectorTile.defaultTileLoadFunction,
    tileUrlFunction: options.tileUrlFunction,
    tilePixelRatio: options.tilePixelRatio,
    url: options.url,
    urls: options.urls,
    wrapX: options.wrapX === undefined ? true : options.wrapX
  });

  /**
   * @private
   * @type {ol.format.Feature}
   */
  this.format_ = options.format ? options.format : null;

  /**
   * @private
   * @type {boolean}
   */
  this.overlaps_ = options.overlaps == undefined ? true : options.overlaps;

  /**
   * @protected
   * @type {function(new: ol.VectorTile, ol.TileCoord, ol.Tile.State, string,
   *        ol.format.Feature, ol.TileLoadFunctionType)}
   */
  this.tileClass = options.tileClass ? options.tileClass : ol.VectorTile;

};
ol.inherits(ol.source.VectorTile, ol.source.UrlTile);


/**
 * @return {boolean} The source can have overlapping geometries.
 */
ol.source.VectorTile.prototype.getOverlaps = function() {
  return this.overlaps_;
};


/**
 * @inheritDoc
 */
ol.source.VectorTile.prototype.getTile = function(z, x, y, pixelRatio, projection) {
  var tileCoordKey = this.getKeyZXY(z, x, y);
  if (this.tileCache.containsKey(tileCoordKey)) {
    return /** @type {!ol.Tile} */ (this.tileCache.get(tileCoordKey));
  } else {
    var tileCoord = [z, x, y];
    var urlTileCoord = this.getTileCoordForTileUrlFunction(
        tileCoord, projection);
    var tileUrl = urlTileCoord ?
        this.tileUrlFunction(urlTileCoord, pixelRatio, projection) : undefined;
    var tile = new this.tileClass(
        tileCoord,
        tileUrl !== undefined ? ol.Tile.State.IDLE : ol.Tile.State.EMPTY,
        tileUrl !== undefined ? tileUrl : '',
        this.format_, this.tileLoadFunction);
    ol.events.listen(tile, ol.events.EventType.CHANGE,
        this.handleTileChange, this);

    this.tileCache.set(tileCoordKey, tile);
    return tile;
  }
};


/**
 * @inheritDoc
 */
ol.source.VectorTile.prototype.getTilePixelRatio = function(opt_pixelRatio) {
  return opt_pixelRatio == undefined ?
      ol.source.UrlTile.prototype.getTilePixelRatio.call(this, opt_pixelRatio) :
      opt_pixelRatio;
};


/**
 * @inheritDoc
 */
ol.source.VectorTile.prototype.getTilePixelSize = function(z, pixelRatio, projection) {
  var tileSize = ol.size.toSize(this.tileGrid.getTileSize(z));
  return [Math.round(tileSize[0] * pixelRatio), Math.round(tileSize[1] * pixelRatio)];
};


/**
 * @param {ol.VectorTile} vectorTile Vector tile.
 * @param {string} url URL.
 */
ol.source.VectorTile.defaultTileLoadFunction = function(vectorTile, url) {
  vectorTile.setLoader(ol.featureloader.tile(url, vectorTile.getFormat()));
};

goog.provide('ol.tilegrid.WMTS');

goog.require('ol');
goog.require('ol.proj');
goog.require('ol.tilegrid.TileGrid');


/**
 * @classdesc
 * Set the grid pattern for sources accessing WMTS tiled-image servers.
 *
 * @constructor
 * @extends {ol.tilegrid.TileGrid}
 * @param {olx.tilegrid.WMTSOptions} options WMTS options.
 * @struct
 * @api
 */
ol.tilegrid.WMTS = function(options) {

  goog.DEBUG && console.assert(
      options.resolutions.length == options.matrixIds.length,
      'options resolutions and matrixIds must have equal length (%s == %s)',
      options.resolutions.length, options.matrixIds.length);

  /**
   * @private
   * @type {!Array.<string>}
   */
  this.matrixIds_ = options.matrixIds;
  // FIXME: should the matrixIds become optionnal?

  ol.tilegrid.TileGrid.call(this, {
    extent: options.extent,
    origin: options.origin,
    origins: options.origins,
    resolutions: options.resolutions,
    tileSize: options.tileSize,
    tileSizes: options.tileSizes,
    sizes: options.sizes
  });

};
ol.inherits(ol.tilegrid.WMTS, ol.tilegrid.TileGrid);


/**
 * @param {number} z Z.
 * @return {string} MatrixId..
 */
ol.tilegrid.WMTS.prototype.getMatrixId = function(z) {
  goog.DEBUG && console.assert(0 <= z && z < this.matrixIds_.length,
      'attempted to retrieve matrixId for illegal z (%s)', z);
  return this.matrixIds_[z];
};


/**
 * Get the list of matrix identifiers.
 * @return {Array.<string>} MatrixIds.
 * @api
 */
ol.tilegrid.WMTS.prototype.getMatrixIds = function() {
  return this.matrixIds_;
};


/**
 * Create a tile grid from a WMTS capabilities matrix set.
 * @param {Object} matrixSet An object representing a matrixSet in the
 *     capabilities document.
 * @param {ol.Extent=} opt_extent An optional extent to restrict the tile
 *     ranges the server provides.
 * @return {ol.tilegrid.WMTS} WMTS tileGrid instance.
 * @api
 */
ol.tilegrid.WMTS.createFromCapabilitiesMatrixSet = function(matrixSet, opt_extent) {

  /** @type {!Array.<number>} */
  var resolutions = [];
  /** @type {!Array.<string>} */
  var matrixIds = [];
  /** @type {!Array.<ol.Coordinate>} */
  var origins = [];
  /** @type {!Array.<ol.Size>} */
  var tileSizes = [];
  /** @type {!Array.<ol.Size>} */
  var sizes = [];

  var supportedCRSPropName = 'SupportedCRS';
  var matrixIdsPropName = 'TileMatrix';
  var identifierPropName = 'Identifier';
  var scaleDenominatorPropName = 'ScaleDenominator';
  var topLeftCornerPropName = 'TopLeftCorner';
  var tileWidthPropName = 'TileWidth';
  var tileHeightPropName = 'TileHeight';

  var projection;
  projection = ol.proj.get(matrixSet[supportedCRSPropName].replace(
      /urn:ogc:def:crs:(\w+):(.*:)?(\w+)$/, '$1:$3'));
  var metersPerUnit = projection.getMetersPerUnit();
  // swap origin x and y coordinates if axis orientation is lat/long
  var switchOriginXY = projection.getAxisOrientation().substr(0, 2) == 'ne';

  matrixSet[matrixIdsPropName].sort(function(a, b) {
    return b[scaleDenominatorPropName] - a[scaleDenominatorPropName];
  });

  matrixSet[matrixIdsPropName].forEach(function(elt, index, array) {
    matrixIds.push(elt[identifierPropName]);
    var resolution = elt[scaleDenominatorPropName] * 0.28E-3 / metersPerUnit;
    var tileWidth = elt[tileWidthPropName];
    var tileHeight = elt[tileHeightPropName];
    if (switchOriginXY) {
      origins.push([elt[topLeftCornerPropName][1],
        elt[topLeftCornerPropName][0]]);
    } else {
      origins.push(elt[topLeftCornerPropName]);
    }
    resolutions.push(resolution);
    tileSizes.push(tileWidth == tileHeight ?
        tileWidth : [tileWidth, tileHeight]);
    // top-left origin, so height is negative
    sizes.push([elt['MatrixWidth'], -elt['MatrixHeight']]);
  });

  return new ol.tilegrid.WMTS({
    extent: opt_extent,
    origins: origins,
    resolutions: resolutions,
    matrixIds: matrixIds,
    tileSizes: tileSizes,
    sizes: sizes
  });
};

goog.provide('ol.source.WMTS');
goog.provide('ol.source.WMTSRequestEncoding');

goog.require('ol');
goog.require('ol.TileUrlFunction');
goog.require('ol.array');
goog.require('ol.extent');
goog.require('ol.obj');
goog.require('ol.proj');
goog.require('ol.source.TileImage');
goog.require('ol.tilegrid.WMTS');
goog.require('ol.uri');


/**
 * Request encoding. One of 'KVP', 'REST'.
 * @enum {string}
 */
ol.source.WMTSRequestEncoding = {
  KVP: 'KVP',  // see spec §8
  REST: 'REST' // see spec §10
};


/**
 * @classdesc
 * Layer source for tile data from WMTS servers.
 *
 * @constructor
 * @extends {ol.source.TileImage}
 * @param {olx.source.WMTSOptions} options WMTS options.
 * @api stable
 */
ol.source.WMTS = function(options) {

  // TODO: add support for TileMatrixLimits

  /**
   * @private
   * @type {string}
   */
  this.version_ = options.version !== undefined ? options.version : '1.0.0';

  /**
   * @private
   * @type {string}
   */
  this.format_ = options.format !== undefined ? options.format : 'image/jpeg';

  /**
   * @private
   * @type {!Object}
   */
  this.dimensions_ = options.dimensions !== undefined ? options.dimensions : {};

  /**
   * @private
   * @type {string}
   */
  this.layer_ = options.layer;

  /**
   * @private
   * @type {string}
   */
  this.matrixSet_ = options.matrixSet;

  /**
   * @private
   * @type {string}
   */
  this.style_ = options.style;

  var urls = options.urls;
  if (urls === undefined && options.url !== undefined) {
    urls = ol.TileUrlFunction.expandUrl(options.url);
  }

  // FIXME: should we guess this requestEncoding from options.url(s)
  //        structure? that would mean KVP only if a template is not provided.

  /**
   * @private
   * @type {ol.source.WMTSRequestEncoding}
   */
  this.requestEncoding_ = options.requestEncoding !== undefined ?
      /** @type {ol.source.WMTSRequestEncoding} */ (options.requestEncoding) :
      ol.source.WMTSRequestEncoding.KVP;

  var requestEncoding = this.requestEncoding_;

  // FIXME: should we create a default tileGrid?
  // we could issue a getCapabilities xhr to retrieve missing configuration
  var tileGrid = options.tileGrid;

  // context property names are lower case to allow for a case insensitive
  // replacement as some services use different naming conventions
  var context = {
    'layer': this.layer_,
    'style': this.style_,
    'tilematrixset': this.matrixSet_
  };

  if (requestEncoding == ol.source.WMTSRequestEncoding.KVP) {
    ol.obj.assign(context, {
      'Service': 'WMTS',
      'Request': 'GetTile',
      'Version': this.version_,
      'Format': this.format_
    });
  }

  var dimensions = this.dimensions_;

  /**
   * @param {string} template Template.
   * @return {ol.TileUrlFunctionType} Tile URL function.
   */
  function createFromWMTSTemplate(template) {

    // TODO: we may want to create our own appendParams function so that params
    // order conforms to wmts spec guidance, and so that we can avoid to escape
    // special template params

    template = (requestEncoding == ol.source.WMTSRequestEncoding.KVP) ?
        ol.uri.appendParams(template, context) :
        template.replace(/\{(\w+?)\}/g, function(m, p) {
          return (p.toLowerCase() in context) ? context[p.toLowerCase()] : m;
        });

    return (
        /**
         * @param {ol.TileCoord} tileCoord Tile coordinate.
         * @param {number} pixelRatio Pixel ratio.
         * @param {ol.proj.Projection} projection Projection.
         * @return {string|undefined} Tile URL.
         */
        function(tileCoord, pixelRatio, projection) {
          if (!tileCoord) {
            return undefined;
          } else {
            var localContext = {
              'TileMatrix': tileGrid.getMatrixId(tileCoord[0]),
              'TileCol': tileCoord[1],
              'TileRow': -tileCoord[2] - 1
            };
            ol.obj.assign(localContext, dimensions);
            var url = template;
            if (requestEncoding == ol.source.WMTSRequestEncoding.KVP) {
              url = ol.uri.appendParams(url, localContext);
            } else {
              url = url.replace(/\{(\w+?)\}/g, function(m, p) {
                return localContext[p];
              });
            }
            return url;
          }
        });
  }

  var tileUrlFunction = (urls && urls.length > 0) ?
      ol.TileUrlFunction.createFromTileUrlFunctions(
          urls.map(createFromWMTSTemplate)) :
      ol.TileUrlFunction.nullTileUrlFunction;

  ol.source.TileImage.call(this, {
    attributions: options.attributions,
    cacheSize: options.cacheSize,
    crossOrigin: options.crossOrigin,
    logo: options.logo,
    projection: options.projection,
    reprojectionErrorThreshold: options.reprojectionErrorThreshold,
    tileClass: options.tileClass,
    tileGrid: tileGrid,
    tileLoadFunction: options.tileLoadFunction,
    tilePixelRatio: options.tilePixelRatio,
    tileUrlFunction: tileUrlFunction,
    urls: urls,
    wrapX: options.wrapX !== undefined ? options.wrapX : false
  });

  this.setKey(this.getKeyForDimensions_());

};
ol.inherits(ol.source.WMTS, ol.source.TileImage);


/**
 * Get the dimensions, i.e. those passed to the constructor through the
 * "dimensions" option, and possibly updated using the updateDimensions
 * method.
 * @return {!Object} Dimensions.
 * @api
 */
ol.source.WMTS.prototype.getDimensions = function() {
  return this.dimensions_;
};


/**
 * Return the image format of the WMTS source.
 * @return {string} Format.
 * @api
 */
ol.source.WMTS.prototype.getFormat = function() {
  return this.format_;
};


/**
 * Return the layer of the WMTS source.
 * @return {string} Layer.
 * @api
 */
ol.source.WMTS.prototype.getLayer = function() {
  return this.layer_;
};


/**
 * Return the matrix set of the WMTS source.
 * @return {string} MatrixSet.
 * @api
 */
ol.source.WMTS.prototype.getMatrixSet = function() {
  return this.matrixSet_;
};


/**
 * Return the request encoding, either "KVP" or "REST".
 * @return {ol.source.WMTSRequestEncoding} Request encoding.
 * @api
 */
ol.source.WMTS.prototype.getRequestEncoding = function() {
  return this.requestEncoding_;
};


/**
 * Return the style of the WMTS source.
 * @return {string} Style.
 * @api
 */
ol.source.WMTS.prototype.getStyle = function() {
  return this.style_;
};


/**
 * Return the version of the WMTS source.
 * @return {string} Version.
 * @api
 */
ol.source.WMTS.prototype.getVersion = function() {
  return this.version_;
};


/**
 * @private
 * @return {string} The key for the current dimensions.
 */
ol.source.WMTS.prototype.getKeyForDimensions_ = function() {
  var i = 0;
  var res = [];
  for (var key in this.dimensions_) {
    res[i++] = key + '-' + this.dimensions_[key];
  }
  return res.join('/');
};


/**
 * Update the dimensions.
 * @param {Object} dimensions Dimensions.
 * @api
 */
ol.source.WMTS.prototype.updateDimensions = function(dimensions) {
  ol.obj.assign(this.dimensions_, dimensions);
  this.setKey(this.getKeyForDimensions_());
};


/**
 * Generate source options from a capabilities object.
 * @param {Object} wmtsCap An object representing the capabilities document.
 * @param {Object} config Configuration properties for the layer.  Defaults for
 *                  the layer will apply if not provided.
 *
 * Required config properties:
 *  - layer - {string} The layer identifier.
 *
 * Optional config properties:
 *  - matrixSet - {string} The matrix set identifier, required if there is
 *       more than one matrix set in the layer capabilities.
 *  - projection - {string} The desired CRS when no matrixSet is specified.
 *       eg: "EPSG:3857". If the desired projection is not available,
 *       an error is thrown.
 *  - requestEncoding - {string} url encoding format for the layer. Default is
 *       the first tile url format found in the GetCapabilities response.
 *  - style - {string} The name of the style
 *  - format - {string} Image format for the layer. Default is the first
 *       format returned in the GetCapabilities response.
 * @return {olx.source.WMTSOptions} WMTS source options object.
 * @api
 */
ol.source.WMTS.optionsFromCapabilities = function(wmtsCap, config) {

  // TODO: add support for TileMatrixLimits
  goog.DEBUG && console.assert(config['layer'],
      'config "layer" must not be null');

  var layers = wmtsCap['Contents']['Layer'];
  var l = ol.array.find(layers, function(elt, index, array) {
    return elt['Identifier'] == config['layer'];
  });
  goog.DEBUG && console.assert(l, 'found a matching layer in Contents/Layer');

  goog.DEBUG && console.assert(l['TileMatrixSetLink'].length > 0,
      'layer has TileMatrixSetLink');
  var tileMatrixSets = wmtsCap['Contents']['TileMatrixSet'];
  var idx, matrixSet;
  if (l['TileMatrixSetLink'].length > 1) {
    if ('projection' in config) {
      idx = ol.array.findIndex(l['TileMatrixSetLink'],
          function(elt, index, array) {
            var tileMatrixSet = ol.array.find(tileMatrixSets, function(el) {
              return el['Identifier'] == elt['TileMatrixSet'];
            });
            return tileMatrixSet['SupportedCRS'].replace(
                /urn:ogc:def:crs:(\w+):(.*:)?(\w+)$/, '$1:$3'
                   ) == config['projection'];
          });
    } else {
      idx = ol.array.findIndex(l['TileMatrixSetLink'],
          function(elt, index, array) {
            return elt['TileMatrixSet'] == config['matrixSet'];
          });
    }
  } else {
    idx = 0;
  }
  if (idx < 0) {
    idx = 0;
  }
  matrixSet = /** @type {string} */
      (l['TileMatrixSetLink'][idx]['TileMatrixSet']);

  goog.DEBUG && console.assert(matrixSet, 'TileMatrixSet must not be null');

  var format = /** @type {string} */ (l['Format'][0]);
  if ('format' in config) {
    format = config['format'];
  }
  idx = ol.array.findIndex(l['Style'], function(elt, index, array) {
    if ('style' in config) {
      return elt['Title'] == config['style'];
    } else {
      return elt['isDefault'];
    }
  });
  if (idx < 0) {
    idx = 0;
  }
  var style = /** @type {string} */ (l['Style'][idx]['Identifier']);

  var dimensions = {};
  if ('Dimension' in l) {
    l['Dimension'].forEach(function(elt, index, array) {
      var key = elt['Identifier'];
      var value = elt['Default'];
      if (value !== undefined) {
        goog.DEBUG && console.assert(ol.array.includes(elt['Value'], value),
            'default value contained in values');
      } else {
        value = elt['Value'][0];
      }
      goog.DEBUG && console.assert(value !== undefined, 'value could be found');
      dimensions[key] = value;
    });
  }

  var matrixSets = wmtsCap['Contents']['TileMatrixSet'];
  var matrixSetObj = ol.array.find(matrixSets, function(elt, index, array) {
    return elt['Identifier'] == matrixSet;
  });
  goog.DEBUG && console.assert(matrixSetObj,
      'found matrixSet in Contents/TileMatrixSet');

  var projection;
  if ('projection' in config) {
    projection = ol.proj.get(config['projection']);
  } else {
    projection = ol.proj.get(matrixSetObj['SupportedCRS'].replace(
        /urn:ogc:def:crs:(\w+):(.*:)?(\w+)$/, '$1:$3'));
  }

  var wgs84BoundingBox = l['WGS84BoundingBox'];
  var extent, wrapX;
  if (wgs84BoundingBox !== undefined) {
    var wgs84ProjectionExtent = ol.proj.get('EPSG:4326').getExtent();
    wrapX = (wgs84BoundingBox[0] == wgs84ProjectionExtent[0] &&
        wgs84BoundingBox[2] == wgs84ProjectionExtent[2]);
    extent = ol.proj.transformExtent(
        wgs84BoundingBox, 'EPSG:4326', projection);
    var projectionExtent = projection.getExtent();
    if (projectionExtent) {
      // If possible, do a sanity check on the extent - it should never be
      // bigger than the validity extent of the projection of a matrix set.
      if (!ol.extent.containsExtent(projectionExtent, extent)) {
        extent = undefined;
      }
    }
  }

  var tileGrid = ol.tilegrid.WMTS.createFromCapabilitiesMatrixSet(
      matrixSetObj, extent);

  /** @type {!Array.<string>} */
  var urls = [];
  var requestEncoding = config['requestEncoding'];
  requestEncoding = requestEncoding !== undefined ? requestEncoding : '';

  goog.DEBUG && console.assert(
      ol.array.includes(['REST', 'RESTful', 'KVP', ''], requestEncoding),
      'requestEncoding (%s) is one of "REST", "RESTful", "KVP" or ""',
      requestEncoding);

  if ('OperationsMetadata' in wmtsCap && 'GetTile' in wmtsCap['OperationsMetadata']) {
    var gets = wmtsCap['OperationsMetadata']['GetTile']['DCP']['HTTP']['Get'];
    goog.DEBUG && console.assert(gets.length >= 1);

    for (var i = 0, ii = gets.length; i < ii; ++i) {
      var constraint = ol.array.find(gets[i]['Constraint'], function(element) {
        return element['name'] == 'GetEncoding';
      });
      var encodings = constraint['AllowedValues']['Value'];
      goog.DEBUG && console.assert(encodings.length >= 1);

      if (requestEncoding === '') {
        // requestEncoding not provided, use the first encoding from the list
        requestEncoding = encodings[0];
      }
      if (requestEncoding === ol.source.WMTSRequestEncoding.KVP) {
        if (ol.array.includes(encodings, ol.source.WMTSRequestEncoding.KVP)) {
          urls.push(/** @type {string} */ (gets[i]['href']));
        }
      } else {
        break;
      }
    }
  }
  if (urls.length === 0) {
    requestEncoding = ol.source.WMTSRequestEncoding.REST;
    l['ResourceURL'].forEach(function(element) {
      if (element['resourceType'] === 'tile') {
        format = element['format'];
        urls.push(/** @type {string} */ (element['template']));
      }
    });
  }
  goog.DEBUG && console.assert(urls.length > 0, 'At least one URL found');

  return {
    urls: urls,
    layer: config['layer'],
    matrixSet: matrixSet,
    format: format,
    projection: projection,
    requestEncoding: requestEncoding,
    tileGrid: tileGrid,
    style: style,
    dimensions: dimensions,
    wrapX: wrapX
  };

};

goog.provide('ol.source.Zoomify');

goog.require('ol');
goog.require('ol.ImageTile');
goog.require('ol.Tile');
goog.require('ol.asserts');
goog.require('ol.dom');
goog.require('ol.extent');
goog.require('ol.source.TileImage');
goog.require('ol.tilegrid.TileGrid');


/**
 * @enum {string}
 */
ol.source.ZoomifyTierSizeCalculation = {
  DEFAULT: 'default',
  TRUNCATED: 'truncated'
};


/**
 * @classdesc
 * Layer source for tile data in Zoomify format.
 *
 * @constructor
 * @extends {ol.source.TileImage}
 * @param {olx.source.ZoomifyOptions=} opt_options Options.
 * @api stable
 */
ol.source.Zoomify = function(opt_options) {

  var options = opt_options || {};

  var size = options.size;
  var tierSizeCalculation = options.tierSizeCalculation !== undefined ?
      options.tierSizeCalculation :
      ol.source.ZoomifyTierSizeCalculation.DEFAULT;

  var imageWidth = size[0];
  var imageHeight = size[1];
  var tierSizeInTiles = [];
  var tileSize = ol.DEFAULT_TILE_SIZE;

  switch (tierSizeCalculation) {
    case ol.source.ZoomifyTierSizeCalculation.DEFAULT:
      while (imageWidth > tileSize || imageHeight > tileSize) {
        tierSizeInTiles.push([
          Math.ceil(imageWidth / tileSize),
          Math.ceil(imageHeight / tileSize)
        ]);
        tileSize += tileSize;
      }
      break;
    case ol.source.ZoomifyTierSizeCalculation.TRUNCATED:
      var width = imageWidth;
      var height = imageHeight;
      while (width > tileSize || height > tileSize) {
        tierSizeInTiles.push([
          Math.ceil(width / tileSize),
          Math.ceil(height / tileSize)
        ]);
        width >>= 1;
        height >>= 1;
      }
      break;
    default:
      ol.asserts.assert(false, 53); // Unknown `tierSizeCalculation` configured
      break;
  }

  tierSizeInTiles.push([1, 1]);
  tierSizeInTiles.reverse();

  var resolutions = [1];
  var tileCountUpToTier = [0];
  var i, ii;
  for (i = 1, ii = tierSizeInTiles.length; i < ii; i++) {
    resolutions.push(1 << i);
    tileCountUpToTier.push(
        tierSizeInTiles[i - 1][0] * tierSizeInTiles[i - 1][1] +
        tileCountUpToTier[i - 1]
    );
  }
  resolutions.reverse();

  var extent = [0, -size[1], size[0], 0];
  var tileGrid = new ol.tilegrid.TileGrid({
    extent: extent,
    origin: ol.extent.getTopLeft(extent),
    resolutions: resolutions
  });

  var url = options.url;

  /**
   * @this {ol.source.TileImage}
   * @param {ol.TileCoord} tileCoord Tile Coordinate.
   * @param {number} pixelRatio Pixel ratio.
   * @param {ol.proj.Projection} projection Projection.
   * @return {string|undefined} Tile URL.
   */
  function tileUrlFunction(tileCoord, pixelRatio, projection) {
    if (!tileCoord) {
      return undefined;
    } else {
      var tileCoordZ = tileCoord[0];
      var tileCoordX = tileCoord[1];
      var tileCoordY = -tileCoord[2] - 1;
      var tileIndex =
          tileCoordX +
          tileCoordY * tierSizeInTiles[tileCoordZ][0] +
          tileCountUpToTier[tileCoordZ];
      var tileGroup = (tileIndex / ol.DEFAULT_TILE_SIZE) | 0;
      return url + 'TileGroup' + tileGroup + '/' +
          tileCoordZ + '-' + tileCoordX + '-' + tileCoordY + '.jpg';
    }
  }

  ol.source.TileImage.call(this, {
    attributions: options.attributions,
    cacheSize: options.cacheSize,
    crossOrigin: options.crossOrigin,
    logo: options.logo,
    reprojectionErrorThreshold: options.reprojectionErrorThreshold,
    tileClass: ol.source.ZoomifyTile_,
    tileGrid: tileGrid,
    tileUrlFunction: tileUrlFunction
  });

};
ol.inherits(ol.source.Zoomify, ol.source.TileImage);


/**
 * @constructor
 * @extends {ol.ImageTile}
 * @param {ol.TileCoord} tileCoord Tile coordinate.
 * @param {ol.Tile.State} state State.
 * @param {string} src Image source URI.
 * @param {?string} crossOrigin Cross origin.
 * @param {ol.TileLoadFunctionType} tileLoadFunction Tile load function.
 * @private
 */
ol.source.ZoomifyTile_ = function(
    tileCoord, state, src, crossOrigin, tileLoadFunction) {

  ol.ImageTile.call(this, tileCoord, state, src, crossOrigin, tileLoadFunction);

  /**
   * @private
   * @type {Object.<string,
   *                HTMLCanvasElement|HTMLImageElement|HTMLVideoElement>}
   */
  this.zoomifyImageByContext_ = {};

};
ol.inherits(ol.source.ZoomifyTile_, ol.ImageTile);


/**
 * @inheritDoc
 */
ol.source.ZoomifyTile_.prototype.getImage = function(opt_context) {
  var tileSize = ol.DEFAULT_TILE_SIZE;
  var key = opt_context !== undefined ?
      ol.getUid(opt_context).toString() : '';
  if (key in this.zoomifyImageByContext_) {
    return this.zoomifyImageByContext_[key];
  } else {
    var image = ol.ImageTile.prototype.getImage.call(this, opt_context);
    if (this.state == ol.Tile.State.LOADED) {
      if (image.width == tileSize && image.height == tileSize) {
        this.zoomifyImageByContext_[key] = image;
        return image;
      } else {
        var context = ol.dom.createCanvasContext2D(tileSize, tileSize);
        context.drawImage(image, 0, 0);
        this.zoomifyImageByContext_[key] = context.canvas;
        return context.canvas;
      }
    } else {
      return image;
    }
  }
};

goog.provide('ol.style.AtlasManager');
goog.provide('ol.style.Atlas');

goog.require('ol');
goog.require('ol.dom');


/**
 * Manages the creation of image atlases.
 *
 * Images added to this manager will be inserted into an atlas, which
 * will be used for rendering.
 * The `size` given in the constructor is the size for the first
 * atlas. After that, when new atlases are created, they will have
 * twice the size as the latest atlas (until `maxSize` is reached).
 *
 * If an application uses many images or very large images, it is recommended
 * to set a higher `size` value to avoid the creation of too many atlases.
 *
 * @constructor
 * @struct
 * @api
 * @param {olx.style.AtlasManagerOptions=} opt_options Options.
 */
ol.style.AtlasManager = function(opt_options) {

  var options = opt_options || {};

  /**
   * The size in pixels of the latest atlas image.
   * @private
   * @type {number}
   */
  this.currentSize_ = options.initialSize !== undefined ?
      options.initialSize : ol.INITIAL_ATLAS_SIZE;

  /**
   * The maximum size in pixels of atlas images.
   * @private
   * @type {number}
   */
  this.maxSize_ = options.maxSize !== undefined ?
      options.maxSize : ol.MAX_ATLAS_SIZE != -1 ?
          ol.MAX_ATLAS_SIZE : ol.WEBGL_MAX_TEXTURE_SIZE !== undefined ?
              ol.WEBGL_MAX_TEXTURE_SIZE : 2048;

  /**
   * The size in pixels between images.
   * @private
   * @type {number}
   */
  this.space_ = options.space !== undefined ? options.space : 1;

  /**
   * @private
   * @type {Array.<ol.style.Atlas>}
   */
  this.atlases_ = [new ol.style.Atlas(this.currentSize_, this.space_)];

  /**
   * The size in pixels of the latest atlas image for hit-detection images.
   * @private
   * @type {number}
   */
  this.currentHitSize_ = this.currentSize_;

  /**
   * @private
   * @type {Array.<ol.style.Atlas>}
   */
  this.hitAtlases_ = [new ol.style.Atlas(this.currentHitSize_, this.space_)];
};


/**
 * @param {string} id The identifier of the entry to check.
 * @return {?ol.AtlasManagerInfo} The position and atlas image for the
 *    entry, or `null` if the entry is not part of the atlas manager.
 */
ol.style.AtlasManager.prototype.getInfo = function(id) {
  /** @type {?ol.AtlasInfo} */
  var info = this.getInfo_(this.atlases_, id);

  if (!info) {
    return null;
  }
  var hitInfo = /** @type {ol.AtlasInfo} */ (this.getInfo_(this.hitAtlases_, id));

  return this.mergeInfos_(info, hitInfo);
};


/**
 * @private
 * @param {Array.<ol.style.Atlas>} atlases The atlases to search.
 * @param {string} id The identifier of the entry to check.
 * @return {?ol.AtlasInfo} The position and atlas image for the entry,
 *    or `null` if the entry is not part of the atlases.
 */
ol.style.AtlasManager.prototype.getInfo_ = function(atlases, id) {
  var atlas, info, i, ii;
  for (i = 0, ii = atlases.length; i < ii; ++i) {
    atlas = atlases[i];
    info = atlas.get(id);
    if (info) {
      return info;
    }
  }
  return null;
};


/**
 * @private
 * @param {ol.AtlasInfo} info The info for the real image.
 * @param {ol.AtlasInfo} hitInfo The info for the hit-detection
 *    image.
 * @return {?ol.AtlasManagerInfo} The position and atlas image for the
 *    entry, or `null` if the entry is not part of the atlases.
 */
ol.style.AtlasManager.prototype.mergeInfos_ = function(info, hitInfo) {
  goog.DEBUG && console.assert(info.offsetX === hitInfo.offsetX,
      'in order to merge, offsetX of info and hitInfo must be equal');
  goog.DEBUG && console.assert(info.offsetY === hitInfo.offsetY,
      'in order to merge, offsetY of info and hitInfo must be equal');
  return /** @type {ol.AtlasManagerInfo} */ ({
    offsetX: info.offsetX,
    offsetY: info.offsetY,
    image: info.image,
    hitImage: hitInfo.image
  });
};


/**
 * Add an image to the atlas manager.
 *
 * If an entry for the given id already exists, the entry will
 * be overridden (but the space on the atlas graphic will not be freed).
 *
 * If `renderHitCallback` is provided, the image (or the hit-detection version
 * of the image) will be rendered into a separate hit-detection atlas image.
 *
 * @param {string} id The identifier of the entry to add.
 * @param {number} width The width.
 * @param {number} height The height.
 * @param {function(CanvasRenderingContext2D, number, number)} renderCallback
 *    Called to render the new image onto an atlas image.
 * @param {function(CanvasRenderingContext2D, number, number)=}
 *    opt_renderHitCallback Called to render a hit-detection image onto a hit
 *    detection atlas image.
 * @param {Object=} opt_this Value to use as `this` when executing
 *    `renderCallback` and `renderHitCallback`.
 * @return {?ol.AtlasManagerInfo}  The position and atlas image for the
 *    entry, or `null` if the image is too big.
 */
ol.style.AtlasManager.prototype.add = function(id, width, height,
        renderCallback, opt_renderHitCallback, opt_this) {
  if (width + this.space_ > this.maxSize_ ||
      height + this.space_ > this.maxSize_) {
    return null;
  }

  /** @type {?ol.AtlasInfo} */
  var info = this.add_(false,
      id, width, height, renderCallback, opt_this);
  if (!info) {
    return null;
  }

  // even if no hit-detection entry is requested, we insert a fake entry into
  // the hit-detection atlas, to make sure that the offset is the same for
  // the original image and the hit-detection image.
  var renderHitCallback = opt_renderHitCallback !== undefined ?
      opt_renderHitCallback : ol.nullFunction;

  var hitInfo = /** @type {ol.AtlasInfo} */ (this.add_(true,
      id, width, height, renderHitCallback, opt_this));

  return this.mergeInfos_(info, hitInfo);
};


/**
 * @private
 * @param {boolean} isHitAtlas If the hit-detection atlases are used.
 * @param {string} id The identifier of the entry to add.
 * @param {number} width The width.
 * @param {number} height The height.
 * @param {function(CanvasRenderingContext2D, number, number)} renderCallback
 *    Called to render the new image onto an atlas image.
 * @param {Object=} opt_this Value to use as `this` when executing
 *    `renderCallback` and `renderHitCallback`.
 * @return {?ol.AtlasInfo}  The position and atlas image for the entry,
 *    or `null` if the image is too big.
 */
ol.style.AtlasManager.prototype.add_ = function(isHitAtlas, id, width, height,
        renderCallback, opt_this) {
  var atlases = (isHitAtlas) ? this.hitAtlases_ : this.atlases_;
  var atlas, info, i, ii;
  for (i = 0, ii = atlases.length; i < ii; ++i) {
    atlas = atlases[i];
    info = atlas.add(id, width, height, renderCallback, opt_this);
    if (info) {
      return info;
    } else if (!info && i === ii - 1) {
      // the entry could not be added to one of the existing atlases,
      // create a new atlas that is twice as big and try to add to this one.
      var size;
      if (isHitAtlas) {
        size = Math.min(this.currentHitSize_ * 2, this.maxSize_);
        this.currentHitSize_ = size;
      } else {
        size = Math.min(this.currentSize_ * 2, this.maxSize_);
        this.currentSize_ = size;
      }
      atlas = new ol.style.Atlas(size, this.space_);
      atlases.push(atlas);
      // run the loop another time
      ++ii;
    }
  }
  goog.DEBUG && console.assert(false, 'Failed to add to atlasmanager');
  return null;
};


/**
 * This class facilitates the creation of image atlases.
 *
 * Images added to an atlas will be rendered onto a single
 * atlas canvas. The distribution of images on the canvas is
 * managed with the bin packing algorithm described in:
 * http://www.blackpawn.com/texts/lightmaps/
 *
 * @constructor
 * @struct
 * @param {number} size The size in pixels of the sprite image.
 * @param {number} space The space in pixels between images.
 *    Because texture coordinates are float values, the edges of
 *    images might not be completely correct (in a way that the
 *    edges overlap when being rendered). To avoid this we add a
 *    padding around each image.
 */
ol.style.Atlas = function(size, space) {

  /**
   * @private
   * @type {number}
   */
  this.space_ = space;

  /**
   * @private
   * @type {Array.<ol.AtlasBlock>}
   */
  this.emptyBlocks_ = [{x: 0, y: 0, width: size, height: size}];

  /**
   * @private
   * @type {Object.<string, ol.AtlasInfo>}
   */
  this.entries_ = {};

  /**
   * @private
   * @type {CanvasRenderingContext2D}
   */
  this.context_ = ol.dom.createCanvasContext2D(size, size);

  /**
   * @private
   * @type {HTMLCanvasElement}
   */
  this.canvas_ = this.context_.canvas;
};


/**
 * @param {string} id The identifier of the entry to check.
 * @return {?ol.AtlasInfo} The atlas info.
 */
ol.style.Atlas.prototype.get = function(id) {
  return this.entries_[id] || null;
};


/**
 * @param {string} id The identifier of the entry to add.
 * @param {number} width The width.
 * @param {number} height The height.
 * @param {function(CanvasRenderingContext2D, number, number)} renderCallback
 *    Called to render the new image onto an atlas image.
 * @param {Object=} opt_this Value to use as `this` when executing
 *    `renderCallback`.
 * @return {?ol.AtlasInfo} The position and atlas image for the entry.
 */
ol.style.Atlas.prototype.add = function(id, width, height, renderCallback, opt_this) {
  var block, i, ii;
  for (i = 0, ii = this.emptyBlocks_.length; i < ii; ++i) {
    block = this.emptyBlocks_[i];
    if (block.width >= width + this.space_ &&
        block.height >= height + this.space_) {
      // we found a block that is big enough for our entry
      var entry = {
        offsetX: block.x + this.space_,
        offsetY: block.y + this.space_,
        image: this.canvas_
      };
      this.entries_[id] = entry;

      // render the image on the atlas image
      renderCallback.call(opt_this, this.context_,
          block.x + this.space_, block.y + this.space_);

      // split the block after the insertion, either horizontally or vertically
      this.split_(i, block, width + this.space_, height + this.space_);

      return entry;
    }
  }

  // there is no space for the new entry in this atlas
  return null;
};


/**
 * @private
 * @param {number} index The index of the block.
 * @param {ol.AtlasBlock} block The block to split.
 * @param {number} width The width of the entry to insert.
 * @param {number} height The height of the entry to insert.
 */
ol.style.Atlas.prototype.split_ = function(index, block, width, height) {
  var deltaWidth = block.width - width;
  var deltaHeight = block.height - height;

  /** @type {ol.AtlasBlock} */
  var newBlock1;
  /** @type {ol.AtlasBlock} */
  var newBlock2;

  if (deltaWidth > deltaHeight) {
    // split vertically
    // block right of the inserted entry
    newBlock1 = {
      x: block.x + width,
      y: block.y,
      width: block.width - width,
      height: block.height
    };

    // block below the inserted entry
    newBlock2 = {
      x: block.x,
      y: block.y + height,
      width: width,
      height: block.height - height
    };
    this.updateBlocks_(index, newBlock1, newBlock2);
  } else {
    // split horizontally
    // block right of the inserted entry
    newBlock1 = {
      x: block.x + width,
      y: block.y,
      width: block.width - width,
      height: height
    };

    // block below the inserted entry
    newBlock2 = {
      x: block.x,
      y: block.y + height,
      width: block.width,
      height: block.height - height
    };
    this.updateBlocks_(index, newBlock1, newBlock2);
  }
};


/**
 * Remove the old block and insert new blocks at the same array position.
 * The new blocks are inserted at the same position, so that splitted
 * blocks (that are potentially smaller) are filled first.
 * @private
 * @param {number} index The index of the block to remove.
 * @param {ol.AtlasBlock} newBlock1 The 1st block to add.
 * @param {ol.AtlasBlock} newBlock2 The 2nd block to add.
 */
ol.style.Atlas.prototype.updateBlocks_ = function(index, newBlock1, newBlock2) {
  var args = [index, 1];
  if (newBlock1.width > 0 && newBlock1.height > 0) {
    args.push(newBlock1);
  }
  if (newBlock2.width > 0 && newBlock2.height > 0) {
    args.push(newBlock2);
  }
  this.emptyBlocks_.splice.apply(this.emptyBlocks_, args);
};

goog.provide('ol.style.RegularShape');

goog.require('ol');
goog.require('ol.color');
goog.require('ol.colorlike');
goog.require('ol.dom');
goog.require('ol.has');
goog.require('ol.render.canvas');
goog.require('ol.style.Image');
goog.require('ol.style.ImageState');


/**
 * @classdesc
 * Set regular shape style for vector features. The resulting shape will be
 * a regular polygon when `radius` is provided, or a star when `radius1` and
 * `radius2` are provided.
 *
 * @constructor
 * @param {olx.style.RegularShapeOptions} options Options.
 * @extends {ol.style.Image}
 * @api
 */
ol.style.RegularShape = function(options) {

  goog.DEBUG && console.assert(
      options.radius !== undefined || options.radius1 !== undefined,
      'must provide either "radius" or "radius1"');

  /**
   * @private
   * @type {Array.<string>}
   */
  this.checksums_ = null;

  /**
   * @private
   * @type {HTMLCanvasElement}
   */
  this.canvas_ = null;

  /**
   * @private
   * @type {HTMLCanvasElement}
   */
  this.hitDetectionCanvas_ = null;

  /**
   * @private
   * @type {ol.style.Fill}
   */
  this.fill_ = options.fill !== undefined ? options.fill : null;

  /**
   * @private
   * @type {Array.<number>}
   */
  this.origin_ = [0, 0];

  /**
   * @private
   * @type {number}
   */
  this.points_ = options.points;

  /**
   * @private
   * @type {number}
   */
  this.radius_ = /** @type {number} */ (options.radius !== undefined ?
      options.radius : options.radius1);

  /**
   * @private
   * @type {number}
   */
  this.radius2_ =
      options.radius2 !== undefined ? options.radius2 : this.radius_;

  /**
   * @private
   * @type {number}
   */
  this.angle_ = options.angle !== undefined ? options.angle : 0;

  /**
   * @private
   * @type {ol.style.Stroke}
   */
  this.stroke_ = options.stroke !== undefined ? options.stroke : null;

  /**
   * @private
   * @type {Array.<number>}
   */
  this.anchor_ = null;

  /**
   * @private
   * @type {ol.Size}
   */
  this.size_ = null;

  /**
   * @private
   * @type {ol.Size}
   */
  this.imageSize_ = null;

  /**
   * @private
   * @type {ol.Size}
   */
  this.hitDetectionImageSize_ = null;

  this.render_(options.atlasManager);

  /**
   * @type {boolean}
   */
  var snapToPixel = options.snapToPixel !== undefined ?
      options.snapToPixel : true;

  /**
   * @type {boolean}
   */
  var rotateWithView = options.rotateWithView !== undefined ?
      options.rotateWithView : false;

  ol.style.Image.call(this, {
    opacity: 1,
    rotateWithView: rotateWithView,
    rotation: options.rotation !== undefined ? options.rotation : 0,
    scale: 1,
    snapToPixel: snapToPixel
  });

};
ol.inherits(ol.style.RegularShape, ol.style.Image);


/**
 * @inheritDoc
 * @api
 */
ol.style.RegularShape.prototype.getAnchor = function() {
  return this.anchor_;
};


/**
 * Get the angle used in generating the shape.
 * @return {number} Shape's rotation in radians.
 * @api
 */
ol.style.RegularShape.prototype.getAngle = function() {
  return this.angle_;
};


/**
 * Get the fill style for the shape.
 * @return {ol.style.Fill} Fill style.
 * @api
 */
ol.style.RegularShape.prototype.getFill = function() {
  return this.fill_;
};


/**
 * @inheritDoc
 */
ol.style.RegularShape.prototype.getHitDetectionImage = function(pixelRatio) {
  return this.hitDetectionCanvas_;
};


/**
 * @inheritDoc
 * @api
 */
ol.style.RegularShape.prototype.getImage = function(pixelRatio) {
  return this.canvas_;
};


/**
 * @inheritDoc
 */
ol.style.RegularShape.prototype.getImageSize = function() {
  return this.imageSize_;
};


/**
 * @inheritDoc
 */
ol.style.RegularShape.prototype.getHitDetectionImageSize = function() {
  return this.hitDetectionImageSize_;
};


/**
 * @inheritDoc
 */
ol.style.RegularShape.prototype.getImageState = function() {
  return ol.style.ImageState.LOADED;
};


/**
 * @inheritDoc
 * @api
 */
ol.style.RegularShape.prototype.getOrigin = function() {
  return this.origin_;
};


/**
 * Get the number of points for generating the shape.
 * @return {number} Number of points for stars and regular polygons.
 * @api
 */
ol.style.RegularShape.prototype.getPoints = function() {
  return this.points_;
};


/**
 * Get the (primary) radius for the shape.
 * @return {number} Radius.
 * @api
 */
ol.style.RegularShape.prototype.getRadius = function() {
  return this.radius_;
};


/**
 * Get the secondary radius for the shape.
 * @return {number} Radius2.
 * @api
 */
ol.style.RegularShape.prototype.getRadius2 = function() {
  return this.radius2_;
};


/**
 * @inheritDoc
 * @api
 */
ol.style.RegularShape.prototype.getSize = function() {
  return this.size_;
};


/**
 * Get the stroke style for the shape.
 * @return {ol.style.Stroke} Stroke style.
 * @api
 */
ol.style.RegularShape.prototype.getStroke = function() {
  return this.stroke_;
};


/**
 * @inheritDoc
 */
ol.style.RegularShape.prototype.listenImageChange = ol.nullFunction;


/**
 * @inheritDoc
 */
ol.style.RegularShape.prototype.load = ol.nullFunction;


/**
 * @inheritDoc
 */
ol.style.RegularShape.prototype.unlistenImageChange = ol.nullFunction;


/**
 * @private
 * @param {ol.style.AtlasManager|undefined} atlasManager An atlas manager.
 */
ol.style.RegularShape.prototype.render_ = function(atlasManager) {
  var imageSize;
  var lineCap = '';
  var lineJoin = '';
  var miterLimit = 0;
  var lineDash = null;
  var strokeStyle;
  var strokeWidth = 0;

  if (this.stroke_) {
    strokeStyle = ol.color.asString(this.stroke_.getColor());
    strokeWidth = this.stroke_.getWidth();
    if (strokeWidth === undefined) {
      strokeWidth = ol.render.canvas.defaultLineWidth;
    }
    lineDash = this.stroke_.getLineDash();
    if (!ol.has.CANVAS_LINE_DASH) {
      lineDash = null;
    }
    lineJoin = this.stroke_.getLineJoin();
    if (lineJoin === undefined) {
      lineJoin = ol.render.canvas.defaultLineJoin;
    }
    lineCap = this.stroke_.getLineCap();
    if (lineCap === undefined) {
      lineCap = ol.render.canvas.defaultLineCap;
    }
    miterLimit = this.stroke_.getMiterLimit();
    if (miterLimit === undefined) {
      miterLimit = ol.render.canvas.defaultMiterLimit;
    }
  }

  var size = 2 * (this.radius_ + strokeWidth) + 1;

  /** @type {ol.RegularShapeRenderOptions} */
  var renderOptions = {
    strokeStyle: strokeStyle,
    strokeWidth: strokeWidth,
    size: size,
    lineCap: lineCap,
    lineDash: lineDash,
    lineJoin: lineJoin,
    miterLimit: miterLimit
  };

  if (atlasManager === undefined) {
    // no atlas manager is used, create a new canvas
    var context = ol.dom.createCanvasContext2D(size, size);
    this.canvas_ = context.canvas;

    // canvas.width and height are rounded to the closest integer
    size = this.canvas_.width;
    imageSize = size;

    this.draw_(renderOptions, context, 0, 0);

    this.createHitDetectionCanvas_(renderOptions);
  } else {
    // an atlas manager is used, add the symbol to an atlas
    size = Math.round(size);

    var hasCustomHitDetectionImage = !this.fill_;
    var renderHitDetectionCallback;
    if (hasCustomHitDetectionImage) {
      // render the hit-detection image into a separate atlas image
      renderHitDetectionCallback =
          this.drawHitDetectionCanvas_.bind(this, renderOptions);
    }

    var id = this.getChecksum();
    var info = atlasManager.add(
        id, size, size, this.draw_.bind(this, renderOptions),
        renderHitDetectionCallback);
    goog.DEBUG && console.assert(info, 'shape size is too large');

    this.canvas_ = info.image;
    this.origin_ = [info.offsetX, info.offsetY];
    imageSize = info.image.width;

    if (hasCustomHitDetectionImage) {
      this.hitDetectionCanvas_ = info.hitImage;
      this.hitDetectionImageSize_ =
          [info.hitImage.width, info.hitImage.height];
    } else {
      this.hitDetectionCanvas_ = this.canvas_;
      this.hitDetectionImageSize_ = [imageSize, imageSize];
    }
  }

  this.anchor_ = [size / 2, size / 2];
  this.size_ = [size, size];
  this.imageSize_ = [imageSize, imageSize];
};


/**
 * @private
 * @param {ol.RegularShapeRenderOptions} renderOptions Render options.
 * @param {CanvasRenderingContext2D} context The rendering context.
 * @param {number} x The origin for the symbol (x).
 * @param {number} y The origin for the symbol (y).
 */
ol.style.RegularShape.prototype.draw_ = function(renderOptions, context, x, y) {
  var i, angle0, radiusC;
  // reset transform
  context.setTransform(1, 0, 0, 1, 0, 0);

  // then move to (x, y)
  context.translate(x, y);

  context.beginPath();
  if (this.radius2_ !== this.radius_) {
    this.points_ = 2 * this.points_;
  }
  for (i = 0; i <= this.points_; i++) {
    angle0 = i * 2 * Math.PI / this.points_ - Math.PI / 2 + this.angle_;
    radiusC = i % 2 === 0 ? this.radius_ : this.radius2_;
    context.lineTo(renderOptions.size / 2 + radiusC * Math.cos(angle0),
                   renderOptions.size / 2 + radiusC * Math.sin(angle0));
  }

  if (this.fill_) {
    context.fillStyle = ol.colorlike.asColorLike(this.fill_.getColor());
    context.fill();
  }
  if (this.stroke_) {
    context.strokeStyle = renderOptions.strokeStyle;
    context.lineWidth = renderOptions.strokeWidth;
    if (renderOptions.lineDash) {
      context.setLineDash(renderOptions.lineDash);
    }
    context.lineCap = renderOptions.lineCap;
    context.lineJoin = renderOptions.lineJoin;
    context.miterLimit = renderOptions.miterLimit;
    context.stroke();
  }
  context.closePath();
};


/**
 * @private
 * @param {ol.RegularShapeRenderOptions} renderOptions Render options.
 */
ol.style.RegularShape.prototype.createHitDetectionCanvas_ = function(renderOptions) {
  this.hitDetectionImageSize_ = [renderOptions.size, renderOptions.size];
  if (this.fill_) {
    this.hitDetectionCanvas_ = this.canvas_;
    return;
  }

  // if no fill style is set, create an extra hit-detection image with a
  // default fill style
  var context = ol.dom.createCanvasContext2D(renderOptions.size, renderOptions.size);
  this.hitDetectionCanvas_ = context.canvas;

  this.drawHitDetectionCanvas_(renderOptions, context, 0, 0);
};


/**
 * @private
 * @param {ol.RegularShapeRenderOptions} renderOptions Render options.
 * @param {CanvasRenderingContext2D} context The context.
 * @param {number} x The origin for the symbol (x).
 * @param {number} y The origin for the symbol (y).
 */
ol.style.RegularShape.prototype.drawHitDetectionCanvas_ = function(renderOptions, context, x, y) {
  // reset transform
  context.setTransform(1, 0, 0, 1, 0, 0);

  // then move to (x, y)
  context.translate(x, y);

  context.beginPath();
  if (this.radius2_ !== this.radius_) {
    this.points_ = 2 * this.points_;
  }
  var i, radiusC, angle0;
  for (i = 0; i <= this.points_; i++) {
    angle0 = i * 2 * Math.PI / this.points_ - Math.PI / 2 + this.angle_;
    radiusC = i % 2 === 0 ? this.radius_ : this.radius2_;
    context.lineTo(renderOptions.size / 2 + radiusC * Math.cos(angle0),
                   renderOptions.size / 2 + radiusC * Math.sin(angle0));
  }

  context.fillStyle = ol.render.canvas.defaultFillStyle;
  context.fill();
  if (this.stroke_) {
    context.strokeStyle = renderOptions.strokeStyle;
    context.lineWidth = renderOptions.strokeWidth;
    if (renderOptions.lineDash) {
      context.setLineDash(renderOptions.lineDash);
    }
    context.stroke();
  }
  context.closePath();
};


/**
 * @return {string} The checksum.
 */
ol.style.RegularShape.prototype.getChecksum = function() {
  var strokeChecksum = this.stroke_ ?
      this.stroke_.getChecksum() : '-';
  var fillChecksum = this.fill_ ?
      this.fill_.getChecksum() : '-';

  var recalculate = !this.checksums_ ||
      (strokeChecksum != this.checksums_[1] ||
      fillChecksum != this.checksums_[2] ||
      this.radius_ != this.checksums_[3] ||
      this.radius2_ != this.checksums_[4] ||
      this.angle_ != this.checksums_[5] ||
      this.points_ != this.checksums_[6]);

  if (recalculate) {
    var checksum = 'r' + strokeChecksum + fillChecksum +
        (this.radius_ !== undefined ? this.radius_.toString() : '-') +
        (this.radius2_ !== undefined ? this.radius2_.toString() : '-') +
        (this.angle_ !== undefined ? this.angle_.toString() : '-') +
        (this.points_ !== undefined ? this.points_.toString() : '-');
    this.checksums_ = [checksum, strokeChecksum, fillChecksum,
      this.radius_, this.radius2_, this.angle_, this.points_];
  }

  return this.checksums_[0];
};

// Copyright 2009 The Closure Library Authors.
// All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// This file has been auto-generated by GenJsDeps, please do not edit.

goog.addDependency(
    'demos/editor/equationeditor.js', ['goog.demos.editor.EquationEditor'],
    ['goog.ui.equation.EquationEditorDialog']);
goog.addDependency(
    'demos/editor/helloworld.js', ['goog.demos.editor.HelloWorld'],
    ['goog.dom', 'goog.dom.TagName', 'goog.editor.Plugin']);
goog.addDependency(
    'demos/editor/helloworlddialog.js',
    [
      'goog.demos.editor.HelloWorldDialog',
      'goog.demos.editor.HelloWorldDialog.OkEvent'
    ],
    [
      'goog.dom.TagName', 'goog.events.Event', 'goog.string',
      'goog.ui.editor.AbstractDialog', 'goog.ui.editor.AbstractDialog.Builder',
      'goog.ui.editor.AbstractDialog.EventType'
    ]);
goog.addDependency(
    'demos/editor/helloworlddialogplugin.js',
    [
      'goog.demos.editor.HelloWorldDialogPlugin',
      'goog.demos.editor.HelloWorldDialogPlugin.Command'
    ],
    [
      'goog.demos.editor.HelloWorldDialog', 'goog.dom.TagName',
      'goog.editor.plugins.AbstractDialogPlugin', 'goog.editor.range',
      'goog.functions', 'goog.ui.editor.AbstractDialog.EventType'
    ]);

/**
 * @fileoverview Custom exports file.
 * @suppress {checkVars,extraRequire}
 */

goog.require('ol');
goog.require('ol.AssertionError');
goog.require('ol.Attribution');
goog.require('ol.Collection');
goog.require('ol.DeviceOrientation');
goog.require('ol.DragBoxEvent');
goog.require('ol.Feature');
goog.require('ol.Geolocation');
goog.require('ol.Graticule');
goog.require('ol.Image');
goog.require('ol.ImageTile');
goog.require('ol.Kinetic');
goog.require('ol.Map');
goog.require('ol.MapBrowserEvent');
goog.require('ol.MapBrowserEvent.EventType');
goog.require('ol.MapBrowserEventHandler');
goog.require('ol.MapBrowserPointerEvent');
goog.require('ol.MapEvent');
goog.require('ol.MapEventType');
goog.require('ol.MapProperty');
goog.require('ol.Object');
goog.require('ol.ObjectEvent');
goog.require('ol.ObjectEventType');
goog.require('ol.Observable');
goog.require('ol.Overlay');
goog.require('ol.OverlayPositioning');
goog.require('ol.RasterOperationType');
goog.require('ol.Sphere');
goog.require('ol.Tile');
goog.require('ol.VectorTile');
goog.require('ol.View');
goog.require('ol.animation');
goog.require('ol.color');
goog.require('ol.colorlike');
goog.require('ol.control');
goog.require('ol.control.Attribution');
goog.require('ol.control.Control');
goog.require('ol.control.FullScreen');
goog.require('ol.control.MousePosition');
goog.require('ol.control.OverviewMap');
goog.require('ol.control.Rotate');
goog.require('ol.control.ScaleLine');
goog.require('ol.control.Zoom');
goog.require('ol.control.ZoomSlider');
goog.require('ol.control.ZoomToExtent');
goog.require('ol.coordinate');
goog.require('ol.easing');
goog.require('ol.events.Event');
goog.require('ol.events.condition');
goog.require('ol.extent');
goog.require('ol.extent.Corner');
goog.require('ol.extent.Relationship');
goog.require('ol.featureloader');
goog.require('ol.format.EsriJSON');
goog.require('ol.format.Feature');
goog.require('ol.format.GML');
goog.require('ol.format.GML2');
goog.require('ol.format.GML3');
goog.require('ol.format.GMLBase');
goog.require('ol.format.GPX');
goog.require('ol.format.GeoJSON');
goog.require('ol.format.IGC');
goog.require('ol.format.IGCZ');
goog.require('ol.format.KML');
goog.require('ol.format.MVT');
goog.require('ol.format.OSMXML');
goog.require('ol.format.Polyline');
goog.require('ol.format.TopoJSON');
goog.require('ol.format.WFS');
goog.require('ol.format.WKT');
goog.require('ol.format.WMSCapabilities');
goog.require('ol.format.WMSGetFeatureInfo');
goog.require('ol.format.WMTSCapabilities');
goog.require('ol.format.ogc.filter');
goog.require('ol.format.ogc.filter.And');
goog.require('ol.format.ogc.filter.Bbox');
goog.require('ol.format.ogc.filter.Comparison');
goog.require('ol.format.ogc.filter.ComparisonBinary');
goog.require('ol.format.ogc.filter.EqualTo');
goog.require('ol.format.ogc.filter.Filter');
goog.require('ol.format.ogc.filter.GreaterThan');
goog.require('ol.format.ogc.filter.GreaterThanOrEqualTo');
goog.require('ol.format.ogc.filter.Intersects');
goog.require('ol.format.ogc.filter.IsBetween');
goog.require('ol.format.ogc.filter.IsLike');
goog.require('ol.format.ogc.filter.IsNull');
goog.require('ol.format.ogc.filter.LessThan');
goog.require('ol.format.ogc.filter.LessThanOrEqualTo');
goog.require('ol.format.ogc.filter.Not');
goog.require('ol.format.ogc.filter.NotEqualTo');
goog.require('ol.format.ogc.filter.Or');
goog.require('ol.format.ogc.filter.Spatial');
goog.require('ol.format.ogc.filter.Within');
goog.require('ol.geom.Circle');
goog.require('ol.geom.Geometry');
goog.require('ol.geom.GeometryCollection');
goog.require('ol.geom.GeometryLayout');
goog.require('ol.geom.GeometryType');
goog.require('ol.geom.LineString');
goog.require('ol.geom.LinearRing');
goog.require('ol.geom.MultiLineString');
goog.require('ol.geom.MultiPoint');
goog.require('ol.geom.MultiPolygon');
goog.require('ol.geom.Point');
goog.require('ol.geom.Polygon');
goog.require('ol.geom.SimpleGeometry');
goog.require('ol.has');
goog.require('ol.interaction');
goog.require('ol.interaction.DoubleClickZoom');
goog.require('ol.interaction.DragAndDrop');
goog.require('ol.interaction.DragAndDropEvent');
goog.require('ol.interaction.DragBox');
goog.require('ol.interaction.DragPan');
goog.require('ol.interaction.DragRotate');
goog.require('ol.interaction.DragRotateAndZoom');
goog.require('ol.interaction.DragZoom');
goog.require('ol.interaction.Draw');
goog.require('ol.interaction.DrawEvent');
goog.require('ol.interaction.DrawEventType');
goog.require('ol.interaction.DrawMode');
goog.require('ol.interaction.Interaction');
goog.require('ol.interaction.InteractionProperty');
goog.require('ol.interaction.KeyboardPan');
goog.require('ol.interaction.KeyboardZoom');
goog.require('ol.interaction.Modify');
goog.require('ol.interaction.ModifyEvent');
goog.require('ol.interaction.MouseWheelZoom');
goog.require('ol.interaction.PinchRotate');
goog.require('ol.interaction.PinchZoom');
goog.require('ol.interaction.Pointer');
goog.require('ol.interaction.Select');
goog.require('ol.interaction.SelectEvent');
goog.require('ol.interaction.SelectEventType');
goog.require('ol.interaction.Snap');
goog.require('ol.interaction.SnapProperty');
goog.require('ol.interaction.Translate');
goog.require('ol.interaction.TranslateEvent');
goog.require('ol.layer.Base');
goog.require('ol.layer.Group');
goog.require('ol.layer.Heatmap');
goog.require('ol.layer.Image');
goog.require('ol.layer.Layer');
goog.require('ol.layer.LayerProperty');
goog.require('ol.layer.Tile');
goog.require('ol.layer.Vector');
goog.require('ol.layer.VectorTile');
goog.require('ol.loadingstrategy');
goog.require('ol.proj');
goog.require('ol.proj.METERS_PER_UNIT');
goog.require('ol.proj.Projection');
goog.require('ol.proj.Units');
goog.require('ol.proj.common');
goog.require('ol.render');
goog.require('ol.render.Event');
goog.require('ol.render.EventType');
goog.require('ol.render.Feature');
goog.require('ol.render.VectorContext');
goog.require('ol.render.canvas.Immediate');
goog.require('ol.render.webgl.Immediate');
goog.require('ol.size');
goog.require('ol.source.BingMaps');
goog.require('ol.source.CartoDB');
goog.require('ol.source.Cluster');
goog.require('ol.source.Image');
goog.require('ol.source.ImageArcGISRest');
goog.require('ol.source.ImageCanvas');
goog.require('ol.source.ImageEvent');
goog.require('ol.source.ImageMapGuide');
goog.require('ol.source.ImageStatic');
goog.require('ol.source.ImageVector');
goog.require('ol.source.ImageWMS');
goog.require('ol.source.OSM');
goog.require('ol.source.Raster');
goog.require('ol.source.RasterEvent');
goog.require('ol.source.RasterEventType');
goog.require('ol.source.Source');
goog.require('ol.source.Stamen');
goog.require('ol.source.State');
goog.require('ol.source.Tile');
goog.require('ol.source.TileArcGISRest');
goog.require('ol.source.TileDebug');
goog.require('ol.source.TileEvent');
goog.require('ol.source.TileImage');
goog.require('ol.source.TileJSON');
goog.require('ol.source.TileUTFGrid');
goog.require('ol.source.TileWMS');
goog.require('ol.source.UrlTile');
goog.require('ol.source.Vector');
goog.require('ol.source.VectorEvent');
goog.require('ol.source.VectorEventType');
goog.require('ol.source.VectorTile');
goog.require('ol.source.WMTS');
goog.require('ol.source.WMTSRequestEncoding');
goog.require('ol.source.XYZ');
goog.require('ol.source.Zoomify');
goog.require('ol.style.Atlas');
goog.require('ol.style.AtlasManager');
goog.require('ol.style.Circle');
goog.require('ol.style.Fill');
goog.require('ol.style.Icon');
goog.require('ol.style.IconAnchorUnits');
goog.require('ol.style.IconOrigin');
goog.require('ol.style.Image');
goog.require('ol.style.ImageState');
goog.require('ol.style.RegularShape');
goog.require('ol.style.Stroke');
goog.require('ol.style.Style');
goog.require('ol.style.Text');
goog.require('ol.tilegrid');
goog.require('ol.tilegrid.TileGrid');
goog.require('ol.tilegrid.WMTS');
goog.require('ol.tilejson');
goog.require('ol.webgl.Context');
goog.require('ol.xml');


goog.exportSymbol(
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goog.exportSymbol(
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goog.exportSymbol(
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goog.exportSymbol(
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    ol.animation.zoom,
    OPENLAYERS);

goog.exportProperty(
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goog.exportSymbol(
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    ol.Attribution,
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goog.exportProperty(
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goog.exportSymbol(
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    ol.Collection,
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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    'pop',
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goog.exportProperty(
    ol.Collection.prototype,
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goog.exportProperty(
    ol.Collection.prototype,
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goog.exportProperty(
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    'removeAt',
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goog.exportProperty(
    ol.Collection.prototype,
    'setAt',
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goog.exportProperty(
    ol.Collection.Event.prototype,
    'element',
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goog.exportSymbol(
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goog.exportSymbol(
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goog.exportSymbol(
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goog.exportSymbol(
    'ol.coordinate.add',
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goog.exportSymbol(
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goog.exportSymbol(
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goog.exportSymbol(
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goog.exportSymbol(
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goog.exportSymbol(
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goog.exportSymbol(
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    ol.DeviceOrientation,
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
    ol.DeviceOrientation.prototype,
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goog.exportProperty(
    ol.DeviceOrientation.prototype,
    'setTracking',
    ol.DeviceOrientation.prototype.setTracking);

goog.exportSymbol(
    'ol.easing.easeIn',
    ol.easing.easeIn,
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goog.exportSymbol(
    'ol.easing.easeOut',
    ol.easing.easeOut,
    OPENLAYERS);

goog.exportSymbol(
    'ol.easing.inAndOut',
    ol.easing.inAndOut,
    OPENLAYERS);

goog.exportSymbol(
    'ol.easing.linear',
    ol.easing.linear,
    OPENLAYERS);

goog.exportSymbol(
    'ol.easing.upAndDown',
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goog.exportSymbol(
    'ol.extent.boundingExtent',
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    OPENLAYERS);

goog.exportSymbol(
    'ol.extent.buffer',
    ol.extent.buffer,
    OPENLAYERS);

goog.exportSymbol(
    'ol.extent.containsCoordinate',
    ol.extent.containsCoordinate,
    OPENLAYERS);

goog.exportSymbol(
    'ol.extent.containsExtent',
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    OPENLAYERS);

goog.exportSymbol(
    'ol.extent.containsXY',
    ol.extent.containsXY,
    OPENLAYERS);

goog.exportSymbol(
    'ol.extent.createEmpty',
    ol.extent.createEmpty,
    OPENLAYERS);

goog.exportSymbol(
    'ol.extent.equals',
    ol.extent.equals,
    OPENLAYERS);

goog.exportSymbol(
    'ol.extent.extend',
    ol.extent.extend,
    OPENLAYERS);

goog.exportSymbol(
    'ol.extent.getBottomLeft',
    ol.extent.getBottomLeft,
    OPENLAYERS);

goog.exportSymbol(
    'ol.extent.getBottomRight',
    ol.extent.getBottomRight,
    OPENLAYERS);

goog.exportSymbol(
    'ol.extent.getCenter',
    ol.extent.getCenter,
    OPENLAYERS);

goog.exportSymbol(
    'ol.extent.getHeight',
    ol.extent.getHeight,
    OPENLAYERS);

goog.exportSymbol(
    'ol.extent.getIntersection',
    ol.extent.getIntersection,
    OPENLAYERS);

goog.exportSymbol(
    'ol.extent.getSize',
    ol.extent.getSize,
    OPENLAYERS);

goog.exportSymbol(
    'ol.extent.getTopLeft',
    ol.extent.getTopLeft,
    OPENLAYERS);

goog.exportSymbol(
    'ol.extent.getTopRight',
    ol.extent.getTopRight,
    OPENLAYERS);

goog.exportSymbol(
    'ol.extent.getWidth',
    ol.extent.getWidth,
    OPENLAYERS);

goog.exportSymbol(
    'ol.extent.intersects',
    ol.extent.intersects,
    OPENLAYERS);

goog.exportSymbol(
    'ol.extent.isEmpty',
    ol.extent.isEmpty,
    OPENLAYERS);

goog.exportSymbol(
    'ol.extent.applyTransform',
    ol.extent.applyTransform,
    OPENLAYERS);

goog.exportSymbol(
    'ol.Feature',
    ol.Feature,
    OPENLAYERS);

goog.exportProperty(
    ol.Feature.prototype,
    'clone',
    ol.Feature.prototype.clone);

goog.exportProperty(
    ol.Feature.prototype,
    'getGeometry',
    ol.Feature.prototype.getGeometry);

goog.exportProperty(
    ol.Feature.prototype,
    'getId',
    ol.Feature.prototype.getId);

goog.exportProperty(
    ol.Feature.prototype,
    'getGeometryName',
    ol.Feature.prototype.getGeometryName);

goog.exportProperty(
    ol.Feature.prototype,
    'getStyle',
    ol.Feature.prototype.getStyle);

goog.exportProperty(
    ol.Feature.prototype,
    'getStyleFunction',
    ol.Feature.prototype.getStyleFunction);

goog.exportProperty(
    ol.Feature.prototype,
    'setGeometry',
    ol.Feature.prototype.setGeometry);

goog.exportProperty(
    ol.Feature.prototype,
    'setStyle',
    ol.Feature.prototype.setStyle);

goog.exportProperty(
    ol.Feature.prototype,
    'setId',
    ol.Feature.prototype.setId);

goog.exportProperty(
    ol.Feature.prototype,
    'setGeometryName',
    ol.Feature.prototype.setGeometryName);

goog.exportSymbol(
    'ol.featureloader.tile',
    ol.featureloader.tile,
    OPENLAYERS);

goog.exportSymbol(
    'ol.featureloader.xhr',
    ol.featureloader.xhr,
    OPENLAYERS);

goog.exportSymbol(
    'ol.Geolocation',
    ol.Geolocation,
    OPENLAYERS);

goog.exportProperty(
    ol.Geolocation.prototype,
    'getAccuracy',
    ol.Geolocation.prototype.getAccuracy);

goog.exportProperty(
    ol.Geolocation.prototype,
    'getAccuracyGeometry',
    ol.Geolocation.prototype.getAccuracyGeometry);

goog.exportProperty(
    ol.Geolocation.prototype,
    'getAltitude',
    ol.Geolocation.prototype.getAltitude);

goog.exportProperty(
    ol.Geolocation.prototype,
    'getAltitudeAccuracy',
    ol.Geolocation.prototype.getAltitudeAccuracy);

goog.exportProperty(
    ol.Geolocation.prototype,
    'getHeading',
    ol.Geolocation.prototype.getHeading);

goog.exportProperty(
    ol.Geolocation.prototype,
    'getPosition',
    ol.Geolocation.prototype.getPosition);

goog.exportProperty(
    ol.Geolocation.prototype,
    'getProjection',
    ol.Geolocation.prototype.getProjection);

goog.exportProperty(
    ol.Geolocation.prototype,
    'getSpeed',
    ol.Geolocation.prototype.getSpeed);

goog.exportProperty(
    ol.Geolocation.prototype,
    'getTracking',
    ol.Geolocation.prototype.getTracking);

goog.exportProperty(
    ol.Geolocation.prototype,
    'getTrackingOptions',
    ol.Geolocation.prototype.getTrackingOptions);

goog.exportProperty(
    ol.Geolocation.prototype,
    'setProjection',
    ol.Geolocation.prototype.setProjection);

goog.exportProperty(
    ol.Geolocation.prototype,
    'setTracking',
    ol.Geolocation.prototype.setTracking);

goog.exportProperty(
    ol.Geolocation.prototype,
    'setTrackingOptions',
    ol.Geolocation.prototype.setTrackingOptions);

goog.exportSymbol(
    'ol.Graticule',
    ol.Graticule,
    OPENLAYERS);

goog.exportProperty(
    ol.Graticule.prototype,
    'getMap',
    ol.Graticule.prototype.getMap);

goog.exportProperty(
    ol.Graticule.prototype,
    'getMeridians',
    ol.Graticule.prototype.getMeridians);

goog.exportProperty(
    ol.Graticule.prototype,
    'getParallels',
    ol.Graticule.prototype.getParallels);

goog.exportProperty(
    ol.Graticule.prototype,
    'setMap',
    ol.Graticule.prototype.setMap);

goog.exportSymbol(
    'ol.has.DEVICE_PIXEL_RATIO',
    ol.has.DEVICE_PIXEL_RATIO,
    OPENLAYERS);

goog.exportSymbol(
    'ol.has.CANVAS',
    ol.has.CANVAS,
    OPENLAYERS);

goog.exportSymbol(
    'ol.has.DEVICE_ORIENTATION',
    ol.has.DEVICE_ORIENTATION,
    OPENLAYERS);

goog.exportSymbol(
    'ol.has.GEOLOCATION',
    ol.has.GEOLOCATION,
    OPENLAYERS);

goog.exportSymbol(
    'ol.has.TOUCH',
    ol.has.TOUCH,
    OPENLAYERS);

goog.exportSymbol(
    'ol.has.WEBGL',
    ol.has.WEBGL,
    OPENLAYERS);

goog.exportProperty(
    ol.Image.prototype,
    'getImage',
    ol.Image.prototype.getImage);

goog.exportProperty(
    ol.Image.prototype,
    'load',
    ol.Image.prototype.load);

goog.exportProperty(
    ol.ImageTile.prototype,
    'getImage',
    ol.ImageTile.prototype.getImage);

goog.exportProperty(
    ol.ImageTile.prototype,
    'load',
    ol.ImageTile.prototype.load);

goog.exportSymbol(
    'ol.inherits',
    ol.inherits,
    OPENLAYERS);

goog.exportSymbol(
    'ol.Kinetic',
    ol.Kinetic,
    OPENLAYERS);

goog.exportSymbol(
    'ol.loadingstrategy.all',
    ol.loadingstrategy.all,
    OPENLAYERS);

goog.exportSymbol(
    'ol.loadingstrategy.bbox',
    ol.loadingstrategy.bbox,
    OPENLAYERS);

goog.exportSymbol(
    'ol.loadingstrategy.tile',
    ol.loadingstrategy.tile,
    OPENLAYERS);

goog.exportSymbol(
    'ol.Map',
    ol.Map,
    OPENLAYERS);

goog.exportProperty(
    ol.Map.prototype,
    'addControl',
    ol.Map.prototype.addControl);

goog.exportProperty(
    ol.Map.prototype,
    'addInteraction',
    ol.Map.prototype.addInteraction);

goog.exportProperty(
    ol.Map.prototype,
    'addLayer',
    ol.Map.prototype.addLayer);

goog.exportProperty(
    ol.Map.prototype,
    'addOverlay',
    ol.Map.prototype.addOverlay);

goog.exportProperty(
    ol.Map.prototype,
    'beforeRender',
    ol.Map.prototype.beforeRender);

goog.exportProperty(
    ol.Map.prototype,
    'forEachFeatureAtPixel',
    ol.Map.prototype.forEachFeatureAtPixel);

goog.exportProperty(
    ol.Map.prototype,
    'forEachLayerAtPixel',
    ol.Map.prototype.forEachLayerAtPixel);

goog.exportProperty(
    ol.Map.prototype,
    'hasFeatureAtPixel',
    ol.Map.prototype.hasFeatureAtPixel);

goog.exportProperty(
    ol.Map.prototype,
    'getEventCoordinate',
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goog.exportProperty(
    ol.Map.prototype,
    'getEventPixel',
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goog.exportProperty(
    ol.Map.prototype,
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goog.exportProperty(
    ol.Map.prototype,
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goog.exportProperty(
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    'getCoordinateFromPixel',
    ol.Map.prototype.getCoordinateFromPixel);

goog.exportProperty(
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goog.exportProperty(
    ol.Map.prototype,
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goog.exportProperty(
    ol.Map.prototype,
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goog.exportProperty(
    ol.Map.prototype,
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    ol.Map.prototype.getInteractions);

goog.exportProperty(
    ol.Map.prototype,
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goog.exportProperty(
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    'getLayers',
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goog.exportProperty(
    ol.Map.prototype,
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goog.exportProperty(
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    'getSize',
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goog.exportProperty(
    ol.Map.prototype,
    'getView',
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goog.exportProperty(
    ol.Map.prototype,
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
    ol.Map.prototype,
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goog.exportProperty(
    ol.Map.prototype,
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goog.exportProperty(
    ol.Map.prototype,
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportSymbol(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportSymbol(
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goog.exportSymbol(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportSymbol(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportSymbol(
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goog.exportSymbol(
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    ol.size.toSize,
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportSymbol(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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    ol.control.OverviewMap.prototype.un);

goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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    ol.control.Rotate.prototype.setTarget);

goog.exportProperty(
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    ol.control.Rotate.prototype.get);

goog.exportProperty(
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goog.exportProperty(
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    ol.control.Rotate.prototype.getProperties);

goog.exportProperty(
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goog.exportProperty(
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    ol.control.Rotate.prototype.setProperties);

goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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    ol.control.ScaleLine.prototype.getRevision);

goog.exportProperty(
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    ol.control.ScaleLine.prototype.on);

goog.exportProperty(
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    ol.control.ScaleLine.prototype.once);

goog.exportProperty(
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    ol.control.ScaleLine.prototype.un);

goog.exportProperty(
    ol.control.ScaleLine.prototype,
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    ol.control.ScaleLine.prototype.unByKey);

goog.exportProperty(
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    ol.control.Zoom.prototype.getMap);

goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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    ol.control.Zoom.prototype.set);

goog.exportProperty(
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    ol.control.Zoom.prototype.setProperties);

goog.exportProperty(
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goog.exportProperty(
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    ol.control.Zoom.prototype.changed);

goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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    ol.control.Zoom.prototype.on);

goog.exportProperty(
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goog.exportProperty(
    ol.control.Zoom.prototype,
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    ol.control.Zoom.prototype.un);

goog.exportProperty(
    ol.control.Zoom.prototype,
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    ol.control.Zoom.prototype.unByKey);

goog.exportProperty(
    ol.control.ZoomSlider.prototype,
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goog.exportProperty(
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goog.exportProperty(
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    ol.control.ZoomSlider.prototype.setTarget);

goog.exportProperty(
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    ol.control.ZoomSlider.prototype.get);

goog.exportProperty(
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goog.exportProperty(
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    ol.control.ZoomSlider.prototype.getProperties);

goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
    ol.control.ZoomSlider.prototype,
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
    ol.control.ZoomToExtent.prototype,
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goog.exportProperty(
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    ol.control.ZoomToExtent.prototype.get);

goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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goog.exportProperty(
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    ol.control.ZoomToExtent.prototype.on);

goog.exportProperty(
    ol.control.ZoomToExtent.prototype,
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    ol.control.ZoomToExtent.prototype.once);

goog.exportProperty(
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    ol.control.ZoomToExtent.prototype.un);

goog.exportProperty(
    ol.control.ZoomToExtent.prototype,
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ol.VERSION = 'v3.18.2';
OPENLAYERS.ol = ol;

  return OPENLAYERS.ol;
}));