flymis/WebRoot/dojojs/src/charting/PlotArea.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.PlotArea");
dojo.require("dojo.lang.common");
dojo.require("dojo.gfx.color");
dojo.require("dojo.gfx.color.hsl");
dojo.require("dojo.charting.Plot");

dojo.charting.PlotArea = function(){
	//	summary
	//	Creates a new PlotArea for drawing onto a Chart.
	var id="dojo-charting-plotarea-"+dojo.charting.PlotArea.count++;
	this.getId=function(){ return id; };
	this.setId=function(key){ id = key; };
	this.areaType = "standard"; 	//	standard || radar
	this.plots = [];	//	plots that will be drawn on this area

	this.size={ width:600, height:400 };
	this.padding={ top:10, right:10, bottom:20, left:20 };

	//	drawing node references.
	this.nodes = {
		main:null,
		area:null,
		background: null,
		axes: null,
		plots: null
	};

	//	this is preset for a limited color range (green to purple), 
	//	anticipating a max of 32 series on this plot area.
	//	if you need more flexibility, override these numbers.
	this._color = { h: 140, s: 120, l: 120, step: 27 };
};
dojo.charting.PlotArea.count = 0;

dojo.extend(dojo.charting.PlotArea, {
	nextColor: function(){
		//	summary
		//	Advances the internal HSV cursor and returns the next generated color.
		var rgb=dojo.gfx.color.hsl2rgb(this._color.h, this._color.s, this._color.l);
		this._color.h = (this._color.h + this._color.step)%360;
		while(this._color.h < 140){ 
			this._color.h += this._color.step; 
		}
		return dojo.gfx.color.rgb2hex(rgb[0], rgb[1], rgb[2]);	//	string
	},
	getArea:function(){
		//	summary
		//	Return an object describing the coordinates of the available area to plot on.
		return {
			left: this.padding.left,