/* Copyright (c) 2006 Yahoo! Inc. All rights reserved. */

YAHOO.util.Color = new function() {

		// Adapted from http://www.easyrgb.com/math.html
		// hsv values = 0 - 1
		// rgb values 0 - 255
		this.hsv2rgb = function (h, s, v) {
				var r, g, b;
				if ( s == 0 ) {
					 r = v * 255;
					 g = v * 255;
					 b = v * 255;
				} else {

					 // h must be < 1
					 var var_h = h * 6;
					 if ( var_h == 6 ) {
							 var_h = 0;
					 }

					 //Or ... var_i = floor( var_h )
					 var var_i = Math.floor( var_h );
					 var var_1 = v * ( 1 - s );
					 var var_2 = v * ( 1 - s * ( var_h - var_i ) );
					 var var_3 = v * ( 1 - s * ( 1 - ( var_h - var_i ) ) );

					 if ( var_i == 0 ) {
							 var_r = v;
							 var_g = var_3;
							 var_b = var_1;
					 } else if ( var_i == 1 ) {
							 var_r = var_2;
							 var_g = v;
							 var_b = var_1;
					 } else if ( var_i == 2 ) {
							 var_r = var_1;
							 var_g = v;
							 var_b = var_3
					 } else if ( var_i == 3 ) {
							 var_r = var_1;
							 var_g = var_2;
							 var_b = v;
					 } else if ( var_i == 4 ) {
							 var_r = var_3;
							 var_g = var_1;
							 var_b = v;
					 } else {
							 var_r = v;
							 var_g = var_1;
							 var_b = var_2
					 }

					 r = var_r * 255									//rgb results = 0-255
					 g = var_g * 255
					 b = var_b * 255

					 }
				return [Math.round(r), Math.round(g), Math.round(b)];
		};

		this.rgb2hex = function (r,g,b) {
				return this.toHex(r) + this.toHex(g) + this.toHex(b);
		};

		this.hexchars = "0123456789ABCDEF";

		this.toHex = function(n) {
				n = n || 0;
				n = parseInt(n, 10);
				if (isNaN(n)) n = 0;
				n = Math.round(Math.min(Math.max(0, n), 255));

				return this.hexchars.charAt((n - n % 16) / 16) + this.hexchars.charAt(n % 16);
		};

		this.toDec = function(hexchar) {
				return this.hexchars.indexOf(hexchar.toUpperCase());
		};

		this.hex2rgb = function(str) {
				var rgb = [];
				rgb[0] = (this.toDec(str.substr(0, 1)) * 16) +
												this.toDec(str.substr(1, 1));
				rgb[1] = (this.toDec(str.substr(2, 1)) * 16) +
												this.toDec(str.substr(3, 1));
				rgb[2] = (this.toDec(str.substr(4, 1)) * 16) +
												this.toDec(str.substr(5, 1));
				// gLogger.debug("hex2rgb: " + str + ", " + rgb.toString());
				return rgb;
		};

		this.isValidRGB = function(a) {
				if ((!a[0] && a[0] !=0) || isNaN(a[0]) || a[0] < 0 || a[0] > 255) return false;
				if ((!a[1] && a[1] !=0) || isNaN(a[1]) || a[1] < 0 || a[1] > 255) return false;
				if ((!a[2] && a[2] !=0) || isNaN(a[2]) || a[2] < 0 || a[2] > 255) return false;

				return true;
		};
}