| <!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'; |
| |
| /** |
| * @fileoverview Quick range computations. |
| */ |
| tr.exportTo('tr.b', function() { |
| |
| function Range() { |
| this.isEmpty_ = true; |
| this.min_ = undefined; |
| this.max_ = undefined; |
| }; |
| |
| Range.prototype = { |
| __proto__: Object.prototype, |
| |
| reset: function() { |
| this.isEmpty_ = true; |
| this.min_ = undefined; |
| this.max_ = undefined; |
| }, |
| |
| get isEmpty() { |
| return this.isEmpty_; |
| }, |
| |
| addRange: function(range) { |
| if (range.isEmpty) |
| return; |
| this.addValue(range.min); |
| this.addValue(range.max); |
| }, |
| |
| addValue: function(value) { |
| if (this.isEmpty_) { |
| this.max_ = value; |
| this.min_ = value; |
| this.isEmpty_ = false; |
| return; |
| } |
| this.max_ = Math.max(this.max_, value); |
| this.min_ = Math.min(this.min_, value); |
| }, |
| |
| set min(min) { |
| this.isEmpty_ = false; |
| this.min_ = min; |
| }, |
| |
| get min() { |
| if (this.isEmpty_) |
| return undefined; |
| return this.min_; |
| }, |
| |
| get max() { |
| if (this.isEmpty_) |
| return undefined; |
| return this.max_; |
| }, |
| |
| set max(max) { |
| this.isEmpty_ = false; |
| this.max_ = max; |
| }, |
| |
| get range() { |
| if (this.isEmpty_) |
| return undefined; |
| return this.max_ - this.min_; |
| }, |
| |
| get center() { |
| return (this.min_ + this.max_) * 0.5; |
| }, |
| |
| equals: function(that) { |
| if (this.isEmpty && that.isEmpty) |
| return true; |
| if (this.isEmpty != that.isEmpty) |
| return false; |
| return this.min === that.min && |
| this.max === that.max; |
| }, |
| |
| containsRange: function(range) { |
| if (this.isEmpty || range.isEmpty) |
| return false; |
| return this.min <= range.min && this.max >= range.max; |
| }, |
| |
| containsExplicitRange: function(min, max) { |
| if (this.isEmpty) |
| return false; |
| return this.min <= min && this.max >= max; |
| }, |
| |
| intersectsRange: function(range) { |
| if (this.isEmpty || range.isEmpty) |
| return false; |
| return !(range.max < this.min || |
| range.min > this.max); |
| }, |
| |
| intersectsExplicitRange: function(min, max) { |
| if (this.isEmpty) |
| return false; |
| return !(max < this.min || |
| min > this.max); |
| } |
| }; |
| |
| Range.fromExplicitRange = function(min, max) { |
| var range = new Range(); |
| range.min = min; |
| range.max = max; |
| return range; |
| }; |
| |
| Range.compareByMinTimes = function(a, b) { |
| if (!a.isEmpty && !b.isEmpty) |
| return a.min_ - b.min_; |
| |
| if (a.isEmpty && !b.isEmpty) |
| return -1; |
| |
| if (!a.isEmpty && b.isEmpty) |
| return 1; |
| |
| return 0; |
| }; |
| |
| return { |
| Range: Range |
| }; |
| }); |
| </script> |
