tools/cc-frame-viewer/src/base/range.js

   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 'use strict';
   5
   6 /**
   7  * @fileoverview Quick range computations.
   8  */
   9 base.exportTo('base', function() {
  10
  11   function Range() {
  12     this.isEmpty_ = true;
  13     this.min_ = undefined;
  14     this.max_ = undefined;
  15   };
  16
  17   Range.prototype = {
  18     __proto__: Object.prototype,
  19
  20     reset: function() {
  21       this.isEmpty_ = true;
  22       this.min_ = undefined;
  23       this.max_ = undefined;
  24     },
  25
  26     get isEmpty() {
  27       return this.isEmpty_;
  28     },
  29
  30     addRange: function(range) {
  31       if (range.isEmpty)
  32         return;
  33       this.addValue(range.min);
  34       this.addValue(range.max);
  35     },
  36
  37     addValue: function(value) {
  38       if (this.isEmpty_) {
  39         this.max_ = value;
  40         this.min_ = value;
  41         this.isEmpty_ = false;
  42         return;
  43       }
  44       this.max_ = Math.max(this.max_, value);
  45       this.min_ = Math.min(this.min_, value);
  46     },
  47
  48     get min() {
  49       if (this.isEmpty_)
  50         return undefined;
  51       return this.min_;
  52     },
  53
  54     get max() {
  55       if (this.isEmpty_)
  56         return undefined;
  57       return this.max_;
  58     },
  59   };
  60
  61   return {
  62     Range: Range
  63   };
  64
  65 });