1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
7 base.exportTo('base', function() {
8 function Color(opt_r, opt_g, opt_b, opt_a) {
9 this.r = Math.floor(opt_r) || 0;
10 this.g = Math.floor(opt_g) || 0;
11 this.b = Math.floor(opt_b) || 0;
15 Color.fromString = function(str) {
18 if (str.substr(0, 4) == 'rgb(') {
19 tmp = str.substr(4, str.length - 5);
20 values = tmp.split(',').map(function(v) {
21 return v.replace(/^\s+/, '', 'g');
23 if (values.length != 3)
24 throw new Error('Malformatted rgb-expression');
29 } else if (str.substr(0, 5) == 'rgba(') {
30 tmp = str.substr(5, str.length - 6);
31 values = tmp.split(',').map(function(v) {
32 return v.replace(/^\s+/, '', 'g');
34 if (values.length != 4)
35 throw new Error('Malformatted rgb-expression');
40 parseFloat(values[3]));
41 } else if (str[0] == '#' && str.length == 7) {
43 parseInt(str.substr(1, 2), 16),
44 parseInt(str.substr(3, 2), 16),
45 parseInt(str.substr(5, 2), 16));
47 throw new Error('Unrecognized string format.');
51 Color.lerp = function(a, b, percent) {
52 if (a.a !== undefined && b.a !== undefined)
53 return Color.lerpRGBA(a, b, percent);
54 return Color.lerpRGB(a, b, percent);
56 Color.lerpRGB = function(a, b, percent) {
58 ((b.r - a.r) * percent) + a.r,
59 ((b.g - a.g) * percent) + a.g,
60 ((b.b - a.b) * percent) + a.b);
63 Color.lerpRGBA = function(a, b, percent) {
65 ((b.r - a.r) * percent) + a.r,
66 ((b.g - a.g) * percent) + a.g,
67 ((b.b - a.b) * percent) + a.b,
68 ((b.a - a.a) * percent) + a.a);
81 brighten: function(opt_k) {
86 Math.min(255, this.r + Math.floor(this.r * k)),
87 Math.min(255, this.g + Math.floor(this.g * k)),
88 Math.min(255, this.b + Math.floor(this.b * k)));
91 darken: function(opt_k) {
96 Math.min(255, this.r - Math.floor(this.r * k)),
97 Math.min(255, this.g - Math.floor(this.g * k)),
98 Math.min(255, this.b - Math.floor(this.b * k)));
101 withAlpha: function(a) {
102 return new Color(this.r, this.g, this.b, a);
105 toString: function() {
106 if (this.a !== undefined) {
108 this.r + ',' + this.g + ',' +
109 this.b + ',' + this.a + ')';
111 return 'rgb(' + this.r + ',' + this.g + ',' + this.b + ')';