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/*
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Copyright (c) 2004-2006, The Dojo Foundation
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All Rights Reserved.
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Licensed under the Academic Free License version 2.1 or above OR the
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modified BSD license. For more information on Dojo licensing, see:
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http://dojotoolkit.org/community/licensing.shtml
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*/
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alexandre_ |
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alexandre_ |
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dojo.provide("dojo.gfx.color");
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dojo.require("dojo.lang.common");
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dojo.require("dojo.lang.array");
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dojo.gfx.color.Color = function (r, g, b, a) {
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if (dojo.lang.isArray(r)) {
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this.r = r[0];
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this.g = r[1];
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this.b = r[2];
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this.a = r[3] || 1;
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} else {
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if (dojo.lang.isString(r)) {
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var rgb = dojo.gfx.color.extractRGB(r);
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this.r = rgb[0];
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this.g = rgb[1];
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this.b = rgb[2];
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this.a = g || 1;
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} else {
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if (r instanceof dojo.gfx.color.Color) {
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this.r = r.r;
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this.b = r.b;
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this.g = r.g;
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this.a = r.a;
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} else {
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this.r = r;
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this.g = g;
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this.b = b;
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this.a = a;
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}
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}
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}
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};
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dojo.gfx.color.Color.fromArray = function (arr) {
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return new dojo.gfx.color.Color(arr[0], arr[1], arr[2], arr[3]);
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};
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dojo.extend(dojo.gfx.color.Color, {toRgb:function (includeAlpha) {
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if (includeAlpha) {
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return this.toRgba();
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} else {
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return [this.r, this.g, this.b];
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}
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}, toRgba:function () {
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return [this.r, this.g, this.b, this.a];
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}, toHex:function () {
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return dojo.gfx.color.rgb2hex(this.toRgb());
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}, toCss:function () {
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return "rgb(" + this.toRgb().join() + ")";
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}, toString:function () {
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return this.toHex();
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}, blend:function (color, weight) {
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var rgb = null;
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if (dojo.lang.isArray(color)) {
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rgb = color;
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} else {
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if (color instanceof dojo.gfx.color.Color) {
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rgb = color.toRgb();
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} else {
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rgb = new dojo.gfx.color.Color(color).toRgb();
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}
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}
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return dojo.gfx.color.blend(this.toRgb(), rgb, weight);
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}});
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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]};
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dojo.gfx.color.blend = function (a, b, weight) {
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if (typeof a == "string") {
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return dojo.gfx.color.blendHex(a, b, weight);
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}
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if (!weight) {
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weight = 0;
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}
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weight = Math.min(Math.max(-1, weight), 1);
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weight = ((weight + 1) / 2);
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var c = [];
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for (var x = 0; x < 3; x++) {
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c[x] = parseInt(b[x] + ((a[x] - b[x]) * weight));
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}
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return c;
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};
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dojo.gfx.color.blendHex = function (a, b, weight) {
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return dojo.gfx.color.rgb2hex(dojo.gfx.color.blend(dojo.gfx.color.hex2rgb(a), dojo.gfx.color.hex2rgb(b), weight));
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};
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dojo.gfx.color.extractRGB = function (color) {
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var hex = "0123456789abcdef";
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color = color.toLowerCase();
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if (color.indexOf("rgb") == 0) {
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var matches = color.match(/rgba*\((\d+), *(\d+), *(\d+)/i);
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var ret = matches.splice(1, 3);
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return ret;
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} else {
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var colors = dojo.gfx.color.hex2rgb(color);
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if (colors) {
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return colors;
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} else {
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return dojo.gfx.color.named[color] || [255, 255, 255];
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}
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}
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};
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dojo.gfx.color.hex2rgb = function (hex) {
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var hexNum = "0123456789ABCDEF";
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var rgb = new Array(3);
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if (hex.indexOf("#") == 0) {
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hex = hex.substring(1);
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}
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hex = hex.toUpperCase();
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if (hex.replace(new RegExp("[" + hexNum + "]", "g"), "") != "") {
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return null;
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}
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if (hex.length == 3) {
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rgb[0] = hex.charAt(0) + hex.charAt(0);
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rgb[1] = hex.charAt(1) + hex.charAt(1);
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rgb[2] = hex.charAt(2) + hex.charAt(2);
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} else {
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rgb[0] = hex.substring(0, 2);
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rgb[1] = hex.substring(2, 4);
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rgb[2] = hex.substring(4);
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}
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for (var i = 0; i < rgb.length; i++) {
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rgb[i] = hexNum.indexOf(rgb[i].charAt(0)) * 16 + hexNum.indexOf(rgb[i].charAt(1));
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}
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return rgb;
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};
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dojo.gfx.color.rgb2hex = function (r, g, b) {
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if (dojo.lang.isArray(r)) {
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g = r[1] || 0;
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b = r[2] || 0;
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r = r[0] || 0;
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}
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var ret = dojo.lang.map([r, g, b], function (x) {
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x = new Number(x);
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var s = x.toString(16);
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while (s.length < 2) {
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s = "0" + s;
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}
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return s;
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});
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ret.unshift("#");
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return ret.join("");
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};
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