207 lines
8.1 KiB
JavaScript
207 lines
8.1 KiB
JavaScript
/**
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* jqPlot
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* Pure JavaScript plotting plugin using jQuery
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*
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* Version: 1.0.0b2_r792
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*
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* Copyright (c) 2009-2011 Chris Leonello
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* jqPlot is currently available for use in all personal or commercial projects
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* under both the MIT (http://www.opensource.org/licenses/mit-license.php) and GPL
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* version 2.0 (http://www.gnu.org/licenses/gpl-2.0.html) licenses. This means that you can
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* choose the license that best suits your project and use it accordingly.
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*
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* Although not required, the author would appreciate an email letting him
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* know of any substantial use of jqPlot. You can reach the author at:
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* chris at jqplot dot com or see http://www.jqplot.com/info.php .
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*
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* If you are feeling kind and generous, consider supporting the project by
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* making a donation at: http://www.jqplot.com/donate.php .
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*
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* sprintf functions contained in jqplot.sprintf.js by Ash Searle:
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*
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* version 2007.04.27
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* author Ash Searle
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* http://hexmen.com/blog/2007/03/printf-sprintf/
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* http://hexmen.com/js/sprintf.js
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* The author (Ash Searle) has placed this code in the public domain:
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* "This code is unrestricted: you are free to use it however you like."
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*
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*/
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(function($) {
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/**
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* Class: $.jqplot.CanvasAxisLabelRenderer
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* Renderer to draw axis labels with a canvas element to support advanced
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* featrues such as rotated text. This renderer uses a separate rendering engine
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* to draw the text on the canvas. Two modes of rendering the text are available.
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* If the browser has native font support for canvas fonts (currently Mozila 3.5
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* and Safari 4), you can enable text rendering with the canvas fillText method.
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* You do so by setting the "enableFontSupport" option to true.
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*
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* Browsers lacking native font support will have the text drawn on the canvas
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* using the Hershey font metrics. Even if the "enableFontSupport" option is true
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* non-supporting browsers will still render with the Hershey font.
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*
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*/
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$.jqplot.CanvasAxisLabelRenderer = function(options) {
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// Group: Properties
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// prop: angle
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// angle of text, measured clockwise from x axis.
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this.angle = 0;
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// name of the axis associated with this tick
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this.axis;
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// prop: show
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// wether or not to show the tick (mark and label).
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this.show = true;
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// prop: showLabel
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// wether or not to show the label.
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this.showLabel = true;
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// prop: label
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// label for the axis.
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this.label = '';
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// prop: fontFamily
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// CSS spec for the font-family css attribute.
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// Applies only to browsers supporting native font rendering in the
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// canvas tag. Currently Mozilla 3.5 and Safari 4.
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this.fontFamily = '"Trebuchet MS", Arial, Helvetica, sans-serif';
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// prop: fontSize
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// CSS spec for font size.
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this.fontSize = '11pt';
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// prop: fontWeight
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// CSS spec for fontWeight: normal, bold, bolder, lighter or a number 100 - 900
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this.fontWeight = 'normal';
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// prop: fontStretch
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// Multiplier to condense or expand font width.
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// Applies only to browsers which don't support canvas native font rendering.
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this.fontStretch = 1.0;
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// prop: textColor
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// css spec for the color attribute.
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this.textColor = '#666666';
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// prop: enableFontSupport
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// true to turn on native canvas font support in Mozilla 3.5+ and Safari 4+.
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// If true, label will be drawn with canvas tag native support for fonts.
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// If false, label will be drawn with Hershey font metrics.
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this.enableFontSupport = true;
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// prop: pt2px
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// Point to pixel scaling factor, used for computing height of bounding box
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// around a label. The labels text renderer has a default setting of 1.4, which
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// should be suitable for most fonts. Leave as null to use default. If tops of
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// letters appear clipped, increase this. If bounding box seems too big, decrease.
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// This is an issue only with the native font renderering capabilities of Mozilla
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// 3.5 and Safari 4 since they do not provide a method to determine the font height.
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this.pt2px = null;
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this._elem;
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this._ctx;
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this._plotWidth;
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this._plotHeight;
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this._plotDimensions = {height:null, width:null};
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$.extend(true, this, options);
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if (options.angle == null && this.axis != 'xaxis' && this.axis != 'x2axis') {
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this.angle = -90;
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}
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var ropts = {fontSize:this.fontSize, fontWeight:this.fontWeight, fontStretch:this.fontStretch, fillStyle:this.textColor, angle:this.getAngleRad(), fontFamily:this.fontFamily};
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if (this.pt2px) {
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ropts.pt2px = this.pt2px;
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}
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if (this.enableFontSupport) {
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function support_canvas_text() {
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return !!(document.createElement('canvas').getContext && typeof document.createElement('canvas').getContext('2d').fillText == 'function');
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}
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if (support_canvas_text()) {
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this._textRenderer = new $.jqplot.CanvasFontRenderer(ropts);
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}
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else {
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this._textRenderer = new $.jqplot.CanvasTextRenderer(ropts);
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}
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}
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else {
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this._textRenderer = new $.jqplot.CanvasTextRenderer(ropts);
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}
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};
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$.jqplot.CanvasAxisLabelRenderer.prototype.init = function(options) {
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$.extend(true, this, options);
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this._textRenderer.init({fontSize:this.fontSize, fontWeight:this.fontWeight, fontStretch:this.fontStretch, fillStyle:this.textColor, angle:this.getAngleRad(), fontFamily:this.fontFamily});
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};
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// return width along the x axis
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// will check first to see if an element exists.
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// if not, will return the computed text box width.
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$.jqplot.CanvasAxisLabelRenderer.prototype.getWidth = function(ctx) {
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if (this._elem) {
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return this._elem.outerWidth(true);
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}
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else {
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var tr = this._textRenderer;
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var l = tr.getWidth(ctx);
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var h = tr.getHeight(ctx);
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var w = Math.abs(Math.sin(tr.angle)*h) + Math.abs(Math.cos(tr.angle)*l);
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return w;
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}
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};
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// return height along the y axis.
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$.jqplot.CanvasAxisLabelRenderer.prototype.getHeight = function(ctx) {
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if (this._elem) {
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return this._elem.outerHeight(true);
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}
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else {
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var tr = this._textRenderer;
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var l = tr.getWidth(ctx);
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var h = tr.getHeight(ctx);
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var w = Math.abs(Math.cos(tr.angle)*h) + Math.abs(Math.sin(tr.angle)*l);
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return w;
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}
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};
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$.jqplot.CanvasAxisLabelRenderer.prototype.getAngleRad = function() {
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var a = this.angle * Math.PI/180;
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return a;
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};
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$.jqplot.CanvasAxisLabelRenderer.prototype.draw = function(ctx, plot) {
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// Memory Leaks patch
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if (this._elem) {
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if ($.jqplot.use_excanvas) {
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window.G_vmlCanvasManager.uninitElement(this._elem.get(0));
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}
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this._elem.emptyForce();
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this._elem = null;
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}
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// create a canvas here, but can't draw on it untill it is appended
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// to dom for IE compatability.
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var elem = plot.canvasManager.getCanvas();
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this._textRenderer.setText(this.label, ctx);
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var w = this.getWidth(ctx);
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var h = this.getHeight(ctx);
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elem.width = w;
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elem.height = h;
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elem.style.width = w;
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elem.style.height = h;
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elem = plot.canvasManager.initCanvas(elem);
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this._elem = $(elem);
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this._elem.css({ position: 'absolute'});
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this._elem.addClass('jqplot-'+this.axis+'-label');
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elem = null;
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return this._elem;
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};
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$.jqplot.CanvasAxisLabelRenderer.prototype.pack = function() {
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this._textRenderer.draw(this._elem.get(0).getContext("2d"), this.label);
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};
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})(jQuery); |