Struts example source code file (color.js)

This example Struts source code file (color.js) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Struts tags/keywords

array, array, number, number, regexp, regexp

The Struts color.js source code

/*
	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("");
};