372 lines
15 KiB
JavaScript
372 lines
15 KiB
JavaScript
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/**
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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: $.jqplot.OHLCRenderer
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* jqPlot Plugin to draw Open Hi Low Close, Candlestick and Hi Low Close charts.
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*
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* To use this plugin, include the renderer js file in
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* your source:
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*
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* > <script type="text/javascript" src="plugins/jqplot.ohlcRenderer.js"></script>
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*
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* You will most likely want to use a date axis renderer
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* for the x axis also, so include the date axis render js file also:
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*
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* > <script type="text/javascript" src="plugins/jqplot.dateAxisRenderer.js"></script>
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*
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* Then you set the renderer in the series options on your plot:
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*
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* > series: [{renderer:$.jqplot.OHLCRenderer}]
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*
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* For OHLC and candlestick charts, data should be specified
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* like so:
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*
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* > dat = [['07/06/2009',138.7,139.68,135.18,135.4], ['06/29/2009',143.46,144.66,139.79,140.02], ...]
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*
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* If the data array has only 4 values per point instead of 5,
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* the renderer will create a Hi Low Close chart instead. In that case,
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* data should be supplied like:
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*
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* > dat = [['07/06/2009',139.68,135.18,135.4], ['06/29/2009',144.66,139.79,140.02], ...]
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*
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* To generate a candlestick chart instead of an OHLC chart,
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* set the "candlestick" option to true:
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*
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* > series: [{renderer:$.jqplot.OHLCRenderer, rendererOptions:{candleStick:true}}],
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*
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*/
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$.jqplot.OHLCRenderer = function(){
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// subclass line renderer to make use of some of it's methods.
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$.jqplot.LineRenderer.call(this);
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// prop: candleStick
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// true to render chart as candleStick.
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// Must have an open price, cannot be a hlc chart.
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this.candleStick = false;
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// prop: tickLength
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// length of the line in pixels indicating open and close price.
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// Default will auto calculate based on plot width and
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// number of points displayed.
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this.tickLength = 'auto';
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// prop: bodyWidth
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// width of the candlestick body in pixels. Default will auto calculate
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// based on plot width and number of candlesticks displayed.
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this.bodyWidth = 'auto';
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// prop: openColor
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// color of the open price tick mark. Default is series color.
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this.openColor = null;
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// prop: closeColor
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// color of the close price tick mark. Default is series color.
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this.closeColor = null;
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// prop: wickColor
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// color of the hi-lo line thorugh the candlestick body.
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// Default is the series color.
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this.wickColor = null;
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// prop: fillUpBody
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// true to render an "up" day (close price greater than open price)
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// with a filled candlestick body.
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this.fillUpBody = false;
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// prop: fillDownBody
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// true to render a "down" day (close price lower than open price)
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// with a filled candlestick body.
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this.fillDownBody = true;
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// prop: upBodyColor
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// Color of candlestick body of an "up" day. Default is series color.
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this.upBodyColor = null;
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// prop: downBodyColor
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// Color of candlestick body on a "down" day. Default is series color.
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this.downBodyColor = null;
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// prop: hlc
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// true if is a hi-low-close chart (no open price).
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// This is determined automatically from the series data.
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this.hlc = false;
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// prop: lineWidth
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// Width of the hi-low line and open/close ticks.
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// Must be set in the rendererOptions for the series.
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this.lineWidth = 1.5;
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this._tickLength;
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this._bodyWidth;
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};
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$.jqplot.OHLCRenderer.prototype = new $.jqplot.LineRenderer();
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$.jqplot.OHLCRenderer.prototype.constructor = $.jqplot.OHLCRenderer;
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// called with scope of series.
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$.jqplot.OHLCRenderer.prototype.init = function(options) {
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options = options || {};
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// lineWidth has to be set on the series, changes in renderer
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// constructor have no effect. set the default here
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// if no renderer option for lineWidth is specified.
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this.lineWidth = options.lineWidth || 1.5;
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$.jqplot.LineRenderer.prototype.init.call(this, options);
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this._type = 'ohlc';
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// set the yaxis data bounds here to account for hi and low values
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var db = this._yaxis._dataBounds;
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var d = this._plotData;
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// if data points have less than 5 values, force a hlc chart.
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if (d[0].length < 5) {
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this.renderer.hlc = true;
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for (var j=0; j<d.length; j++) {
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if (d[j][2] < db.min || db.min == null) {
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db.min = d[j][2];
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}
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if (d[j][1] > db.max || db.max == null) {
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db.max = d[j][1];
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}
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}
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}
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else {
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for (var j=0; j<d.length; j++) {
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if (d[j][3] < db.min || db.min == null) {
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db.min = d[j][3];
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}
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if (d[j][2] > db.max || db.max == null) {
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db.max = d[j][2];
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}
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}
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}
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};
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// called within scope of series.
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$.jqplot.OHLCRenderer.prototype.draw = function(ctx, gd, options) {
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var d = this.data;
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var xmin = this._xaxis.min;
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var xmax = this._xaxis.max;
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// index of last value below range of plot.
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var xminidx = 0;
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// index of first value above range of plot.
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var xmaxidx = d.length;
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var xp = this._xaxis.series_u2p;
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var yp = this._yaxis.series_u2p;
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var i, prevColor, ops, b, h, w, a, points;
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var o;
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var r = this.renderer;
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var opts = (options != undefined) ? options : {};
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var shadow = (opts.shadow != undefined) ? opts.shadow : this.shadow;
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var fill = (opts.fill != undefined) ? opts.fill : this.fill;
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var fillAndStroke = (opts.fillAndStroke != undefined) ? opts.fillAndStroke : this.fillAndStroke;
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r.bodyWidth = (opts.bodyWidth != undefined) ? opts.bodyWidth : r.bodyWidth;
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r.tickLength = (opts.tickLength != undefined) ? opts.tickLength : r.tickLength;
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ctx.save();
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if (this.show) {
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var x, open, hi, low, close;
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// need to get widths based on number of points shown,
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// not on total number of points. Use the results
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// to speed up drawing in next step.
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for (var i=0; i<d.length; i++) {
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if (d[i][0] < xmin) {
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xminidx = i;
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}
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else if (d[i][0] < xmax) {
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xmaxidx = i+1;
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}
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}
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var dwidth = this.gridData[xmaxidx-1][0] - this.gridData[xminidx][0];
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var nvisiblePoints = xmaxidx - xminidx;
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try {
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var dinterval = Math.abs(this._xaxis.series_u2p(parseInt(this._xaxis._intervalStats[0].sortedIntervals[0].interval)) - this._xaxis.series_u2p(0));
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}
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catch (e) {
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var dinterval = dwidth / nvisiblePoints;
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}
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if (r.candleStick) {
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if (typeof(r.bodyWidth) == 'number') {
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r._bodyWidth = r.bodyWidth;
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}
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else {
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r._bodyWidth = Math.min(20, dinterval/1.75);
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}
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}
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else {
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if (typeof(r.tickLength) == 'number') {
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r._tickLength = r.tickLength;
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}
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else {
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r._tickLength = Math.min(10, dinterval/3.5);
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}
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}
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for (var i=xminidx; i<xmaxidx; i++) {
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x = xp(d[i][0]);
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if (r.hlc) {
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open = null;
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hi = yp(d[i][1]);
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low = yp(d[i][2]);
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close = yp(d[i][3]);
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}
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else {
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open = yp(d[i][1]);
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hi = yp(d[i][2]);
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low = yp(d[i][3]);
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close = yp(d[i][4]);
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}
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o = {};
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if (r.candleStick && !r.hlc) {
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w = r._bodyWidth;
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a = x - w/2;
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// draw candle
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// determine if candle up or down
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// up, remember grid coordinates increase downward
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if (close < open) {
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// draw wick
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if (r.wickColor) {
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o.color = r.wickColor;
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}
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else if (r.downBodyColor) {
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o.color = r.upBodyColor;
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}
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ops = $.extend(true, {}, opts, o);
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r.shapeRenderer.draw(ctx, [[x, hi], [x, close]], ops);
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r.shapeRenderer.draw(ctx, [[x, open], [x, low]], ops);
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o = {};
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b = close;
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h = open - close;
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// if color specified, use it
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if (r.fillUpBody) {
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o.fillRect = true;
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}
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else {
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o.strokeRect = true;
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w = w - this.lineWidth;
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a = x - w/2;
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}
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if (r.upBodyColor) {
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o.color = r.upBodyColor;
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o.fillStyle = r.upBodyColor;
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}
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points = [a, b, w, h];
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}
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// down
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else if (close > open) {
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// draw wick
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if (r.wickColor) {
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o.color = r.wickColor;
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}
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else if (r.downBodyColor) {
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o.color = r.downBodyColor;
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}
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ops = $.extend(true, {}, opts, o);
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r.shapeRenderer.draw(ctx, [[x, hi], [x, open]], ops);
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r.shapeRenderer.draw(ctx, [[x, close], [x, low]], ops);
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o = {};
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b = open;
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h = close - open;
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// if color specified, use it
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if (r.fillDownBody) {
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o.fillRect = true;
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}
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else {
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o.strokeRect = true;
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w = w - this.lineWidth;
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a = x - w/2;
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}
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if (r.downBodyColor) {
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o.color = r.downBodyColor;
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o.fillStyle = r.downBodyColor;
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}
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points = [a, b, w, h];
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}
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// even, open = close
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else {
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// draw wick
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if (r.wickColor) {
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o.color = r.wickColor;
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}
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ops = $.extend(true, {}, opts, o);
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r.shapeRenderer.draw(ctx, [[x, hi], [x, low]], ops);
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o = {};
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o.fillRect = false;
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o.strokeRect = false;
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a = [x - w/2, open];
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b = [x + w/2, close];
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w = null;
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h = null;
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points = [a, b];
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}
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ops = $.extend(true, {}, opts, o);
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r.shapeRenderer.draw(ctx, points, ops);
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}
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else {
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prevColor = opts.color;
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if (r.openColor) {
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opts.color = r.openColor;
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}
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// draw open tick
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if (!r.hlc) {
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r.shapeRenderer.draw(ctx, [[x-r._tickLength, open], [x, open]], opts);
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}
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opts.color = prevColor;
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// draw wick
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if (r.wickColor) {
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opts.color = r.wickColor;
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}
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r.shapeRenderer.draw(ctx, [[x, hi], [x, low]], opts);
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opts.color = prevColor;
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// draw close tick
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if (r.closeColor) {
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opts.color = r.closeColor;
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}
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r.shapeRenderer.draw(ctx, [[x, close], [x+r._tickLength, close]], opts);
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opts.color = prevColor;
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}
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}
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}
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ctx.restore();
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};
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$.jqplot.OHLCRenderer.prototype.drawShadow = function(ctx, gd, options) {
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// This is a no-op, shadows drawn with lines.
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};
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// called with scope of plot.
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$.jqplot.OHLCRenderer.checkOptions = function(target, data, options) {
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// provide some sensible highlighter options by default
|
||
|
|
// These aren't good for hlc, only for ohlc or candlestick
|
||
|
|
if (!options.highlighter) {
|
||
|
|
options.highlighter = {
|
||
|
|
showMarker:false,
|
||
|
|
tooltipAxes: 'y',
|
||
|
|
yvalues: 4,
|
||
|
|
formatString:'<table class="jqplot-highlighter"><tr><td>date:</td><td>%s</td></tr><tr><td>open:</td><td>%s</td></tr><tr><td>hi:</td><td>%s</td></tr><tr><td>low:</td><td>%s</td></tr><tr><td>close:</td><td>%s</td></tr></table>'
|
||
|
|
};
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
//$.jqplot.preInitHooks.push($.jqplot.OHLCRenderer.checkOptions);
|
||
|
|
|
||
|
|
})(jQuery);
|