| <!DOCTYPE html> |
| <!-- |
| Copyright (c) 2014 The Chromium Authors. All rights reserved. |
| Use of this source code is governed by a BSD-style license that can be |
| found in the LICENSE file. |
| --> |
| <link rel="import" href="/base/base.html"> |
| <script> |
| 'use strict'; |
| |
| tr.exportTo('tr.b', function() { |
| function Color(opt_r, opt_g, opt_b, opt_a) { |
| this.r = Math.floor(opt_r) || 0; |
| this.g = Math.floor(opt_g) || 0; |
| this.b = Math.floor(opt_b) || 0; |
| this.a = opt_a; |
| } |
| |
| Color.fromString = function(str) { |
| var tmp; |
| var values; |
| if (str.substr(0, 4) == 'rgb(') { |
| tmp = str.substr(4, str.length - 5); |
| values = tmp.split(',').map(function(v) { |
| return v.replace(/^\s+/, '', 'g'); |
| }); |
| if (values.length != 3) |
| throw new Error('Malformatted rgb-expression'); |
| return new Color( |
| parseInt(values[0]), |
| parseInt(values[1]), |
| parseInt(values[2])); |
| } else if (str.substr(0, 5) == 'rgba(') { |
| tmp = str.substr(5, str.length - 6); |
| values = tmp.split(',').map(function(v) { |
| return v.replace(/^\s+/, '', 'g'); |
| }); |
| if (values.length != 4) |
| throw new Error('Malformatted rgb-expression'); |
| return new Color( |
| parseInt(values[0]), |
| parseInt(values[1]), |
| parseInt(values[2]), |
| parseFloat(values[3])); |
| } else if (str[0] == '#' && str.length == 7) { |
| return new Color( |
| parseInt(str.substr(1, 2), 16), |
| parseInt(str.substr(3, 2), 16), |
| parseInt(str.substr(5, 2), 16)); |
| } else { |
| throw new Error('Unrecognized string format.'); |
| } |
| }; |
| |
| Color.lerp = function(a, b, percent) { |
| if (a.a !== undefined && b.a !== undefined) |
| return Color.lerpRGBA(a, b, percent); |
| return Color.lerpRGB(a, b, percent); |
| } |
| |
| Color.lerpRGB = function(a, b, percent) { |
| return new Color( |
| ((b.r - a.r) * percent) + a.r, |
| ((b.g - a.g) * percent) + a.g, |
| ((b.b - a.b) * percent) + a.b); |
| } |
| |
| Color.lerpRGBA = function(a, b, percent) { |
| return new Color( |
| ((b.r - a.r) * percent) + a.r, |
| ((b.g - a.g) * percent) + a.g, |
| ((b.b - a.b) * percent) + a.b, |
| ((b.a - a.a) * percent) + a.a); |
| } |
| |
| Color.prototype = { |
| clone: function() { |
| var c = new Color(); |
| c.r = this.r; |
| c.g = this.g; |
| c.b = this.b; |
| c.a = this.a; |
| return c; |
| }, |
| |
| blendOver: function(bgColor) { |
| var oneMinusThisAlpha = 1 - this.a; |
| var outA = this.a + bgColor.a * oneMinusThisAlpha; |
| var bgBlend = (bgColor.a * oneMinusThisAlpha) / bgColor.a; |
| return new Color( |
| this.r * this.a + bgColor.r * bgBlend, |
| this.g * this.a + bgColor.g * bgBlend, |
| this.b * this.a + bgColor.b * bgBlend, |
| outA); |
| }, |
| |
| brighten: function(opt_k) { |
| var k; |
| k = opt_k || 0.45; |
| |
| return new Color( |
| Math.min(255, this.r + Math.floor(this.r * k)), |
| Math.min(255, this.g + Math.floor(this.g * k)), |
| Math.min(255, this.b + Math.floor(this.b * k))); |
| }, |
| |
| darken: function(opt_k) { |
| var k; |
| k = opt_k || 0.45; |
| |
| return new Color( |
| Math.min(255, this.r - Math.floor(this.r * k)), |
| Math.min(255, this.g - Math.floor(this.g * k)), |
| Math.min(255, this.b - Math.floor(this.b * k))); |
| }, |
| |
| withAlpha: function(a) { |
| return new Color(this.r, this.g, this.b, a); |
| }, |
| |
| toString: function() { |
| if (this.a !== undefined) { |
| return 'rgba(' + |
| this.r + ',' + this.g + ',' + |
| this.b + ',' + this.a + ')'; |
| } |
| return 'rgb(' + this.r + ',' + this.g + ',' + this.b + ')'; |
| } |
| }; |
| |
| return { |
| Color: Color |
| }; |
| }); |
| </script> |
