flymis/WebRoot/dojojs/src/widget/Chart.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.widget.Chart");

dojo.require("dojo.widget.*");
dojo.require("dojo.gfx.color");
dojo.require("dojo.gfx.color.hsl");

// Base class for svg and vml implementations of Chart
dojo.declare(
	"dojo.widget.Chart",
	null,
	function(){
		this.series = [];
	},
{
	isContainer: false,

	assignColors: function(){
		//	summary
		//	Assigns/generates a color for a data series.
		var hue=30;
		var sat=120;
		var lum=120;
		var steps = Math.round(330/this.series.length);

		for(var i=0; i<this.series.length; i++){
			var c=dojo.gfx.color.hsl2rgb(hue,sat,lum);
			if(!this.series[i].color){
				this.series[i].color = dojo.gfx.color.rgb2hex(c[0],c[1],c[2]);
			}
			hue += steps;
		}
	},
	parseData: function(table){
		var thead=table.getElementsByTagName("thead")[0];
		var tbody=table.getElementsByTagName("tbody")[0];
		if(!(thead&&tbody)) dojo.raise("dojo.widget.Chart: supplied table must define a head and a body.");

		//	set up the series.
		var columns=thead.getElementsByTagName("tr")[0].getElementsByTagName("th");	//	should be <tr><..>
		
		//	assume column 0 == X
		for (var i=1; i<columns.length; i++){
			var key="column"+i;
			var label=columns[i].innerHTML;
			var plotType=columns[i].getAttribute("plotType")||"line";
			var color=columns[i].getAttribute("color");
			var ds=new dojo.widget.Chart.DataSeries(key,label,plotType,color);
			this.series.push(ds);
		}