PerformanceTests/Animometer/tests/master/resources/canvas-stage.js

   1 SimpleCanvasStage = Utilities.createSubclass(Stage,
   2     function(canvasObject)
   3     {
   4         Stage.call(this);
   5         this._canvasObject = canvasObject;
   6         this.objects = [];
   7         this.offsetIndex = 0;
   8     }, {
   9
  10     initialize: function(benchmark, options)
  11     {
  12         Stage.prototype.initialize.call(this, benchmark, options);
  13         this.context = this.element.getContext("2d");
  14     },
  15
  16     tune: function(count)
  17     {
  18         if (count == 0)
  19             return;
  20
  21         if (count < 0) {
  22             this.offsetIndex = Math.min(this.offsetIndex - count, this.objects.length);
  23             return;
  24         }
  25
  26         var newIndex = this.offsetIndex - count;
  27         if (newIndex < 0) {
  28             this.offsetIndex = 0;
  29             newIndex = -newIndex;
  30             for (var i = 0; i < newIndex; ++i)
  31                 this.objects.push(new this._canvasObject(this));
  32         } else
  33             this.offsetIndex = newIndex;
  34     },
  35
  36     animate: function()
  37     {
  38         var context = this.context;
  39         context.clearRect(0, 0, this.size.x, this.size.y);
  40         for (var i = this.offsetIndex, length = this.objects.length; i < length; ++i)
  41             this.objects[i].draw(context);
  42     },
  43
  44     complexity: function()
  45     {
  46         return this.objects.length - this.offsetIndex;
  47     }
  48 });