/*	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.gfx.color");dojo.require("dojo.lang.common");dojo.require("dojo.lang.array");dojo.gfx.color.Color = function (r, g, b, a) {	if (dojo.lang.isArray(r)) {		this.r = r[0];		this.g = r[1];		this.b = r[2];		this.a = r[3] || 1;	} else {		if (dojo.lang.isString(r)) {			var rgb = dojo.gfx.color.extractRGB(r);			this.r = rgb[0];			this.g = rgb[1];			this.b = rgb[2];			this.a = g || 1;		} else {			if (r instanceof dojo.gfx.color.Color) {				this.r = r.r;				this.b = r.b;				this.g = r.g;				this.a = r.a;			} else {				this.r = r;				this.g = g;				this.b = b;				this.a = a;			}		}	}};dojo.gfx.color.Color.fromArray = function (arr) {	return new dojo.gfx.color.Color(arr[0], arr[1], arr[2], arr[3]);};dojo.extend(dojo.gfx.color.Color, {toRgb:function (includeAlpha) {	if (includeAlpha) {		return this.toRgba();	} else {		return [this.r, this.g, this.b];	}}, toRgba:function () {	return [this.r, this.g, this.b, this.a];}, toHex:function () {	return dojo.gfx.color.rgb2hex(this.toRgb());}, toCss:function () {	return "rgb(" + this.toRgb().join() + ")";}, toString:function () {	return this.toHex();}, blend:function (color, weight) {	var rgb = null;	if (dojo.lang.isArray(color)) {		rgb = color;	} else {		if (color instanceof dojo.gfx.color.Color) {			rgb = color.toRgb();		} else {			rgb = new dojo.gfx.color.Color(color).toRgb();		}	}	return dojo.gfx.color.blend(this.toRgb(), rgb, weight);}});dojo.gfx.color.named = {white:[255, 255, 255], black:[0, 0, 0], red:[255, 0, 0], green:[0, 255, 0], lime:[0, 255, 0], blue:[0, 0, 255], navy:[0, 0, 128], gray:[128, 128, 128], silver:[192, 192, 192]};dojo.gfx.color.blend = function (a, b, weight) {	if (typeof a == "string") {		return dojo.gfx.color.blendHex(a, b, weight);	}	if (!weight) {		weight = 0;	}	weight = Math.min(Math.max(-1, weight), 1);	weight = ((weight + 1) / 2);	var c = [];	for (var x = 0; x < 3; x++) {		c[x] = parseInt(b[x] + ((a[x] - b[x]) * weight));	}	return c;};dojo.gfx.color.blendHex = function (a, b, weight) {	return dojo.gfx.color.rgb2hex(dojo.gfx.color.blend(dojo.gfx.color.hex2rgb(a), dojo.gfx.color.hex2rgb(b), weight));};dojo.gfx.color.extractRGB = function (color) {	var hex = "0123456789abcdef";	color = color.toLowerCase();	if (color.indexOf("rgb") == 0) {		var matches = color.match(/rgba*\((\d+), *(\d+), *(\d+)/i);		var ret = matches.splice(1, 3);		return ret;	} else {		var colors = dojo.gfx.color.hex2rgb(color);		if (colors) {			return colors;		} else {			return dojo.gfx.color.named[color] || [255, 255, 255];		}	}};dojo.gfx.color.hex2rgb = function (hex) {	var hexNum = "0123456789ABCDEF";	var rgb = new Array(3);	if (hex.indexOf("#") == 0) {		hex = hex.substring(1);	}	hex = hex.toUpperCase();	if (hex.replace(new RegExp("[" + hexNum + "]", "g"), "") != "") {		return null;	}	if (hex.length == 3) {		rgb[0] = hex.charAt(0) + hex.charAt(0);		rgb[1] = hex.charAt(1) + hex.charAt(1);		rgb[2] = hex.charAt(2) + hex.charAt(2);	} else {		rgb[0] = hex.substring(0, 2);		rgb[1] = hex.substring(2, 4);		rgb[2] = hex.substring(4);	}	for (var i = 0; i < rgb.length; i++) {		rgb[i] = hexNum.indexOf(rgb[i].charAt(0)) * 16 + hexNum.indexOf(rgb[i].charAt(1));	}	return rgb;};dojo.gfx.color.rgb2hex = function (r, g, b) {	if (dojo.lang.isArray(r)) {		g = r[1] || 0;		b = r[2] || 0;		r = r[0] || 0;	}	var ret = dojo.lang.map([r, g, b], function (x) {		x = new Number(x);		var s = x.toString(16);		while (s.length < 2) {			s = "0" + s;		}		return s;	});	ret.unshift("#");	return ret.join("");};