| Chris Craik | b2cbf15 | 2015-07-28 16:26:29 -0700 | [diff] [blame^] | 1 | <!DOCTYPE html> |
| 2 | <!-- |
| 3 | Copyright (c) 2014 The Chromium Authors. All rights reserved. |
| 4 | Use of this source code is governed by a BSD-style license that can be |
| 5 | found in the LICENSE file. |
| 6 | --> |
| 7 | |
| 8 | <link rel="import" href="/base/base.html"> |
| 9 | |
| 10 | <script> |
| 11 | 'use strict'; |
| 12 | |
| 13 | /** |
| 14 | * @fileoverview Quick range computations. |
| 15 | */ |
| 16 | tr.exportTo('tr.b', function() { |
| 17 | |
| 18 | function Range() { |
| 19 | this.isEmpty_ = true; |
| 20 | this.min_ = undefined; |
| 21 | this.max_ = undefined; |
| 22 | }; |
| 23 | |
| 24 | Range.prototype = { |
| 25 | __proto__: Object.prototype, |
| 26 | |
| 27 | reset: function() { |
| 28 | this.isEmpty_ = true; |
| 29 | this.min_ = undefined; |
| 30 | this.max_ = undefined; |
| 31 | }, |
| 32 | |
| 33 | get isEmpty() { |
| 34 | return this.isEmpty_; |
| 35 | }, |
| 36 | |
| 37 | addRange: function(range) { |
| 38 | if (range.isEmpty) |
| 39 | return; |
| 40 | this.addValue(range.min); |
| 41 | this.addValue(range.max); |
| 42 | }, |
| 43 | |
| 44 | addValue: function(value) { |
| 45 | if (this.isEmpty_) { |
| 46 | this.max_ = value; |
| 47 | this.min_ = value; |
| 48 | this.isEmpty_ = false; |
| 49 | return; |
| 50 | } |
| 51 | this.max_ = Math.max(this.max_, value); |
| 52 | this.min_ = Math.min(this.min_, value); |
| 53 | }, |
| 54 | |
| 55 | set min(min) { |
| 56 | this.isEmpty_ = false; |
| 57 | this.min_ = min; |
| 58 | }, |
| 59 | |
| 60 | get min() { |
| 61 | if (this.isEmpty_) |
| 62 | return undefined; |
| 63 | return this.min_; |
| 64 | }, |
| 65 | |
| 66 | get max() { |
| 67 | if (this.isEmpty_) |
| 68 | return undefined; |
| 69 | return this.max_; |
| 70 | }, |
| 71 | |
| 72 | set max(max) { |
| 73 | this.isEmpty_ = false; |
| 74 | this.max_ = max; |
| 75 | }, |
| 76 | |
| 77 | get range() { |
| 78 | if (this.isEmpty_) |
| 79 | return undefined; |
| 80 | return this.max_ - this.min_; |
| 81 | }, |
| 82 | |
| 83 | get center() { |
| 84 | return (this.min_ + this.max_) * 0.5; |
| 85 | }, |
| 86 | |
| 87 | equals: function(that) { |
| 88 | if (this.isEmpty && that.isEmpty) |
| 89 | return true; |
| 90 | if (this.isEmpty != that.isEmpty) |
| 91 | return false; |
| 92 | return this.min === that.min && |
| 93 | this.max === that.max; |
| 94 | }, |
| 95 | |
| 96 | containsRange: function(range) { |
| 97 | if (this.isEmpty || range.isEmpty) |
| 98 | return false; |
| 99 | return this.min <= range.min && this.max >= range.max; |
| 100 | }, |
| 101 | |
| 102 | containsExplicitRange: function(min, max) { |
| 103 | if (this.isEmpty) |
| 104 | return false; |
| 105 | return this.min <= min && this.max >= max; |
| 106 | }, |
| 107 | |
| 108 | intersectsRange: function(range) { |
| 109 | if (this.isEmpty || range.isEmpty) |
| 110 | return false; |
| 111 | return !(range.max < this.min || |
| 112 | range.min > this.max); |
| 113 | }, |
| 114 | |
| 115 | intersectsExplicitRange: function(min, max) { |
| 116 | if (this.isEmpty) |
| 117 | return false; |
| 118 | return !(max < this.min || |
| 119 | min > this.max); |
| 120 | } |
| 121 | }; |
| 122 | |
| 123 | Range.fromExplicitRange = function(min, max) { |
| 124 | var range = new Range(); |
| 125 | range.min = min; |
| 126 | range.max = max; |
| 127 | return range; |
| 128 | }; |
| 129 | |
| 130 | Range.compareByMinTimes = function(a, b) { |
| 131 | if (!a.isEmpty && !b.isEmpty) |
| 132 | return a.min_ - b.min_; |
| 133 | |
| 134 | if (a.isEmpty && !b.isEmpty) |
| 135 | return -1; |
| 136 | |
| 137 | if (!a.isEmpty && b.isEmpty) |
| 138 | return 1; |
| 139 | |
| 140 | return 0; |
| 141 | }; |
| 142 | |
| 143 | return { |
| 144 | Range: Range |
| 145 | }; |
| 146 | }); |
| 147 | </script> |