flymis/WebRoot/dojojs/src/charting/vml/Plotters.js

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/*
	Copyright (c) 2004-2006, The Dojo Foundation
	All Rights Reserved.

	Licensed under the Academic Free License version 2.1 or above OR the
	modified BSD license. For more information on Dojo licensing, see:

		http://dojotoolkit.org/community/licensing.shtml
*/

dojo.provide("dojo.charting.vml.Plotters");
dojo.require("dojo.lang.common");

dojo.mixin(dojo.charting.Plotters, {
	/*********************************************************
	 *	Grouped plotters: need all series on a plot at once.
	 *********************************************************/
	Bar: function(
		/* dojo.charting.PlotArea */plotarea,
		/* dojo.charting.Plot */plot,
		/* object? */kwArgs,
		/* function? */applyTo
	){
		//	summary
		//	Plots a set of grouped bars.
		//	Bindings: y
		var area = plotarea.getArea();
		var group = document.createElement("div");
		group.style.position="absolute";
		group.style.top="0px";
		group.style.left="0px";
		group.style.width=plotarea.size.width+"px";
		group.style.height=plotarea.size.height+"px";
		
		//	precompile the data
		var n = plot.series.length;	//	how many series
		var data = [];
		for(var i=0; i<n; i++){
			var tmp = plot.series[i].data.evaluate(kwArgs);
			data.push(tmp);
		}

		//	calculate the width of each bar.
		var space = 8;
		var nPoints = data[0].length;
		var width = ((area.right-area.left)-(space*(nPoints-1)))/nPoints;	//	the width of each group.
		var barWidth = Math.round(width/n);	//	the width of each bar, no spaces.
		var yOrigin = plot.axisY.getCoord(plot.axisX.origin, plotarea, plot);

		for(var i=0; i<nPoints; i++){
			//	calculate offset
			var xStart = area.left+(width*i)+(space*i);
			for(var j=0; j<n; j++){
				var value = data[j][i].y;
				var yA = yOrigin;
				var x = xStart + (barWidth*j);
				var y = plot.axisY.getCoord(value, plotarea, plot);
				var h = Math.abs(yA-y);
				if(value < plot.axisX.origin){
					yA = y;