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. 4 5 'use strict'; 6 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; 12 this.a = opt_a; 13 } 14 15 Color.fromString = function(str) { 16 var tmp; 17 var values; 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'); 22 }); 23 if (values.length != 3) 24 throw new Error('Malformatted rgb-expression'); 25 return new Color( 26 parseInt(values[0]), 27 parseInt(values[1]), 28 parseInt(values[2])); 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'); 33 }); 34 if (values.length != 4) 35 throw new Error('Malformatted rgb-expression'); 36 return new Color( 37 parseInt(values[0]), 38 parseInt(values[1]), 39 parseInt(values[2]), 40 parseFloat(values[3])); 41 } else if (str[0] == '#' && str.length == 7) { 42 return new Color( 43 parseInt(str.substr(1, 2), 16), 44 parseInt(str.substr(3, 2), 16), 45 parseInt(str.substr(5, 2), 16)); 46 } else { 47 throw new Error('Unrecognized string format.'); 48 } 49 }; 50 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); 55 } 56 Color.lerpRGB = function(a, b, percent) { 57 return new Color( 58 ((b.r - a.r) * percent) + a.r, 59 ((b.g - a.g) * percent) + a.g, 60 ((b.b - a.b) * percent) + a.b); 61 } 62 63 Color.lerpRGBA = function(a, b, percent) { 64 return new Color( 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); 69 } 70 71 Color.prototype = { 72 brighten: function(opt_k) { 73 var k; 74 k = opt_k || 0.45; 75 76 return new Color( 77 Math.min(255, this.r + Math.floor(this.r * k)), 78 Math.min(255, this.g + Math.floor(this.g * k)), 79 Math.min(255, this.b + Math.floor(this.b * k))); 80 }, 81 82 darken: function(opt_k) { 83 var k; 84 k = opt_k || 0.45; 85 86 return new Color( 87 Math.min(255, this.r - Math.floor(this.r * k)), 88 Math.min(255, this.g - Math.floor(this.g * k)), 89 Math.min(255, this.b - Math.floor(this.b * k))); 90 }, 91 92 withAlpha: function(a) { 93 return new Color(this.r, this.g, this.b, a); 94 }, 95 96 toString: function() { 97 if (this.a !== undefined) { 98 return 'rgba(' + 99 this.r + ',' + this.g + ',' + 100 this.b + ',' + this.a + ')'; 101 } 102 return 'rgb(' + this.r + ',' + this.g + ',' + this.b + ')'; 103 } 104 }; 105 106 return { 107 Color: Color 108 }; 109 }); 110
