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404 lines
17 KiB
404 lines
17 KiB
/**
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* Copyright (c) 2009 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 and GPL version 2.0 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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* The author would appreciate an email letting him know of any substantial
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* use of jqPlot. You can reach the author at: chris dot leonello at gmail
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* dot com or see http://www.jqplot.com/info.php . This is, of course,
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* not required.
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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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* Thanks for using jqPlot!
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*
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*/
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(function($) {
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// Class: $.jqplot.BarRenderer
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// A plugin renderer for jqPlot to draw a bar plot.
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// Draws series as a line.
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$.jqplot.BarRenderer = function(){
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$.jqplot.LineRenderer.call(this);
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};
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$.jqplot.BarRenderer.prototype = new $.jqplot.LineRenderer();
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$.jqplot.BarRenderer.prototype.constructor = $.jqplot.BarRenderer;
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// called with scope of series.
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$.jqplot.BarRenderer.prototype.init = function(options) {
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// Group: Properties
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//
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// prop: barPadding
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// Number of pixels between adjacent bars at the same axis value.
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this.barPadding = 8;
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// prop: barMargin
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// Number of pixels between groups of bars at adjacent axis values.
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this.barMargin = 10;
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// prop: barDirection
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// 'vertical' = up and down bars, 'horizontal' = side to side bars
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this.barDirection = 'vertical';
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// prop: barWidth
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// Width of the bar in pixels (auto by devaul). null = calculated automatically.
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this.barWidth = null;
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// prop: shadowOffset
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// offset of the shadow from the slice and offset of
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// each succesive stroke of the shadow from the last.
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this.shadowOffset = 2;
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// prop: shadowDepth
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// number of strokes to apply to the shadow,
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// each stroke offset shadowOffset from the last.
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this.shadowDepth = 5;
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// prop: shadowAlpha
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// transparency of the shadow (0 = transparent, 1 = opaque)
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this.shadowAlpha = 0.08;
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// prop: waterfall
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// true to enable waterfall plot.
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this.waterfall = false;
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// prop: varyBarColor
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// true to color each bar separately.
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this.varyBarColor = false;
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$.extend(true, this, options);
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// fill is still needed to properly draw the legend.
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// bars have to be filled.
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this.fill = true;
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if (this.waterfall) {
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this.fillToZero = false;
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this.disableStack = true;
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}
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if (this.barDirection == 'vertical' ) {
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this._primaryAxis = '_xaxis';
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this._stackAxis = 'y';
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this.fillAxis = 'y';
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}
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else {
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this._primaryAxis = '_yaxis';
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this._stackAxis = 'x';
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this.fillAxis = 'x';
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}
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// set the shape renderer options
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var opts = {lineJoin:'miter', lineCap:'round', fill:true, isarc:false, strokeStyle:this.color, fillStyle:this.color, closePath:this.fill};
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this.renderer.shapeRenderer.init(opts);
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// set the shadow renderer options
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var sopts = {lineJoin:'miter', lineCap:'round', fill:true, isarc:false, angle:this.shadowAngle, offset:this.shadowOffset, alpha:this.shadowAlpha, depth:this.shadowDepth, closePath:this.fill};
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this.renderer.shadowRenderer.init(sopts);
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};
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// called with scope of series
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function barPreInit(target, data, seriesDefaults, options) {
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if (this.rendererOptions.barDirection == 'horizontal') {
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this._stackAxis = 'x';
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this._primaryAxis = '_yaxis';
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}
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if (this.rendererOptions.waterfall == true) {
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this._data = $.extend(true, [], this.data);
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var sum = 0;
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var pos = (!this.rendererOptions.barDirection || this.rendererOptions.barDirection == 'vertical') ? 1 : 0;
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for(var i=0; i<this.data.length; i++) {
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sum += this.data[i][pos];
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if (i>0) {
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this.data[i][pos] += this.data[i-1][pos];
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}
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}
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this.data[this.data.length] = (pos == 1) ? [this.data.length+1, sum] : [sum, this.data.length+1];
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this._data[this._data.length] = (pos == 1) ? [this._data.length+1, sum] : [sum, this._data.length+1];
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}
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}
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$.jqplot.preSeriesInitHooks.push(barPreInit);
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// needs to be called with scope of series, not renderer.
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$.jqplot.BarRenderer.prototype.calcSeriesNumbers = function() {
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var nvals = 0;
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var nseries = 0;
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var paxis = this[this._primaryAxis];
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var s, series, pos;
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// loop through all series on this axis
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for (var i=0; i < paxis._series.length; i++) {
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series = paxis._series[i];
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if (series === this) {
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pos = i;
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}
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// is the series rendered as a bar?
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if (series.renderer.constructor == $.jqplot.BarRenderer) {
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// gridData may not be computed yet, use data length insted
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nvals += series.data.length;
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nseries += 1;
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}
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}
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return [nvals, nseries, pos];
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};
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$.jqplot.BarRenderer.prototype.setBarWidth = function() {
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// need to know how many data values we have on the approprate axis and figure it out.
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var i;
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var nvals = 0;
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var nseries = 0;
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var paxis = this[this._primaryAxis];
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var s, series, pos;
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var temp = this.renderer.calcSeriesNumbers.call(this);
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nvals = temp[0];
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nseries = temp[1];
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var nticks = paxis.numberTicks;
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var nbins = (nticks-1)/2;
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// so, now we have total number of axis values.
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if (paxis.name == 'xaxis' || paxis.name == 'x2axis') {
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if (this._stack) {
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this.barWidth = (paxis._offsets.max - paxis._offsets.min) / nvals * nseries - this.barMargin;
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}
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else {
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this.barWidth = ((paxis._offsets.max - paxis._offsets.min)/nbins - this.barPadding * (nseries-1) - this.barMargin*2)/nseries;
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// this.barWidth = (paxis._offsets.max - paxis._offsets.min) / nvals - this.barPadding - this.barMargin/nseries;
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}
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}
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else {
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if (this._stack) {
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this.barWidth = (paxis._offsets.min - paxis._offsets.max) / nvals * nseries - this.barMargin;
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}
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else {
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this.barWidth = ((paxis._offsets.min - paxis._offsets.max)/nbins - this.barPadding * (nseries-1) - this.barMargin*2)/nseries;
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// this.barWidth = (paxis._offsets.min - paxis._offsets.max) / nvals - this.barPadding - this.barMargin/nseries;
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}
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}
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return [nvals, nseries];
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};
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$.jqplot.BarRenderer.prototype.draw = function(ctx, gridData, options) {
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var i;
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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 showLine = (opts.showLine != undefined) ? opts.showLine : this.showLine;
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var fill = (opts.fill != undefined) ? opts.fill : this.fill;
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var xaxis = this.xaxis;
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var yaxis = this.yaxis;
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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 pointx, pointy, nvals, nseries, pos;
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if (this.barWidth == null) {
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this.renderer.setBarWidth.call(this);
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}
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var temp = this.renderer.calcSeriesNumbers.call(this);
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nvals = temp[0];
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nseries = temp[1];
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pos = temp[2];
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if (this._stack) {
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this._barNudge = 0;
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}
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else {
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this._barNudge = (-Math.abs(nseries/2 - 0.5) + pos) * (this.barWidth + this.barPadding);
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}
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if (showLine) {
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var negativeColors = new $.jqplot.ColorGenerator(this.negativeSeriesColors);
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var positiveColors = new $.jqplot.ColorGenerator(this.seriesColors);
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var negativeColor = negativeColors.get(this.index);
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if (! this.useNegativeColors) {
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negativeColor = opts.fillStyle;
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}
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var positiveColor = opts.fillStyle;
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if (this.barDirection == 'vertical') {
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for (var i=0; i<gridData.length; i++) {
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points = [];
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var base = gridData[i][0] + this._barNudge;
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var ystart;
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// stacked
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if (this._stack && this._prevGridData.length) {
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ystart = this._prevGridData[i][1];
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}
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// not stacked and first series in stack
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else {
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if (this.fillToZero) {
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ystart = this._yaxis.series_u2p(0);
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}
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else if (this.waterfall && i > 0 && i < this.gridData.length-1) {
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ystart = this.gridData[i-1][1];
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}
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else {
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ystart = ctx.canvas.height;
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}
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}
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if ((this.fillToZero && this._plotData[i][1] < 0) || (this.waterfall && this._data[i][1] < 0)) {
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if (this.varyBarColor) {
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if (this.useNegativeColors) {
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opts.fillStyle = negativeColors.next();
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}
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else {
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opts.fillStyle = positiveColors.next();
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}
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}
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else {
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opts.fillStyle = negativeColor;
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}
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}
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else {
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if (this.varyBarColor) {
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opts.fillStyle = positiveColors.next();
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}
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else {
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opts.fillStyle = positiveColor;
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}
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}
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points.push([base-this.barWidth/2, ystart]);
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points.push([base-this.barWidth/2, gridData[i][1]]);
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points.push([base+this.barWidth/2, gridData[i][1]]);
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points.push([base+this.barWidth/2, ystart]);
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// now draw the shadows if not stacked.
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// for stacked plots, they are predrawn by drawShadow
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if (shadow && !this._stack) {
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this.renderer.shadowRenderer.draw(ctx, points, opts);
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}
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this.renderer.shapeRenderer.draw(ctx, points, opts);
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}
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}
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else if (this.barDirection == 'horizontal'){
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for (var i=0; i<gridData.length; i++) {
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points = [];
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var base = gridData[i][1] - this._barNudge;
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var xstart;
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if (this._stack && this._prevGridData.length) {
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xstart = this._prevGridData[i][0];
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}
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// not stacked and first series in stack
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else {
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if (this.fillToZero) {
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xstart = this._xaxis.series_u2p(0);
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}
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else if (this.waterfall && i > 0 && i < this.gridData.length-1) {
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xstart = this.gridData[i-1][1];
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}
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else {
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xstart = 0;
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}
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}
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if ((this.fillToZero && this._plotData[i][1] < 0) || (this.waterfall && this._data[i][1] < 0)) {
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if (this.varyBarColor) {
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if (this.useNegativeColors) {
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opts.fillStyle = negativeColors.next();
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}
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else {
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opts.fillStyle = positiveColors.next();
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}
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}
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}
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else {
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if (this.varyBarColor) {
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opts.fillStyle = positiveColors.next();
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}
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else {
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opts.fillStyle = positiveColor;
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}
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}
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points.push([xstart, base+this.barWidth/2]);
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points.push([gridData[i][0], base+this.barWidth/2]);
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points.push([gridData[i][0], base-this.barWidth/2]);
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points.push([xstart, base-this.barWidth/2]);
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// now draw the shadows if not stacked.
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// for stacked plots, they are predrawn by drawShadow
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if (shadow && !this._stack) {
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this.renderer.shadowRenderer.draw(ctx, points, opts);
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}
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this.renderer.shapeRenderer.draw(ctx, points, opts);
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}
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}
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}
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};
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// for stacked plots, shadows will be pre drawn by drawShadow.
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$.jqplot.BarRenderer.prototype.drawShadow = function(ctx, gridData, options) {
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var i;
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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 showLine = (opts.showLine != undefined) ? opts.showLine : this.showLine;
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var fill = (opts.fill != undefined) ? opts.fill : this.fill;
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var xaxis = this.xaxis;
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var yaxis = this.yaxis;
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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 pointx, pointy, nvals, nseries, pos;
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if (this._stack && this.shadow) {
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if (this.barWidth == null) {
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this.renderer.setBarWidth.call(this);
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}
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var temp = this.renderer.calcSeriesNumbers.call(this);
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nvals = temp[0];
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nseries = temp[1];
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pos = temp[2];
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if (this._stack) {
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this._barNudge = 0;
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}
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else {
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this._barNudge = (-Math.abs(nseries/2 - 0.5) + pos) * (this.barWidth + this.barPadding);
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}
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if (showLine) {
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if (this.barDirection == 'vertical') {
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for (var i=0; i<gridData.length; i++) {
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points = [];
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var base = gridData[i][0] + this._barNudge;
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var ystart;
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if (this._stack && this._prevGridData.length) {
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ystart = this._prevGridData[i][1];
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}
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else {
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if (this.fillToZero) {
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ystart = this._yaxis.series_u2p(0);
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}
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else {
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ystart = ctx.canvas.height;
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}
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}
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points.push([base-this.barWidth/2, ystart]);
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points.push([base-this.barWidth/2, gridData[i][1]]);
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points.push([base+this.barWidth/2, gridData[i][1]]);
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points.push([base+this.barWidth/2, ystart]);
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this.renderer.shadowRenderer.draw(ctx, points, opts);
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}
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}
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else if (this.barDirection == 'horizontal'){
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for (var i=0; i<gridData.length; i++) {
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points = [];
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var base = gridData[i][1] - this._barNudge;
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var xstart;
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if (this._stack && this._prevGridData.length) {
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xstart = this._prevGridData[i][0];
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}
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else {
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xstart = 0;
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}
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points.push([xstart, base+this.barWidth/2]);
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points.push([gridData[i][0], base+this.barWidth/2]);
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points.push([gridData[i][0], base-this.barWidth/2]);
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points.push([xstart, base-this.barWidth/2]);
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this.renderer.shadowRenderer.draw(ctx, points, opts);
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}
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}
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}
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}
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};
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})(jQuery);
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