package {
          import flash.display.Bitmap;
          import flash.display.BitmapData;
          import flash.display.BlendMode;
          import flash.display.Sprite;
          import flash.display.StageAlign;
          import flash.display.StageScaleMode;
          import flash.events.Event;
          import flash.filters.BlurFilter;
          import flash.geom.Matrix;
          import flash.geom.Point;
          import flash.geom.Rectangle;
          import flash.media.Camera;
          import flash.media.Video;
  
          public class @ax-lib-flex-animation-code-05-MotionTracking extends Sprite
          {
          private var _cam:Camera;
          private var _vid:Video;
          private var _newFrame:BitmapData;
          private var _oldFrame:BitmapData;
          private var _blendFrame:BitmapData;
          private var _cbRect:Sprite;
          private var _paddle:Sprite;
          
          
                  public function @ax-lib-flex-animation-code-05-MotionTracking()
                  {
              stage.align = StageAlign.TOP_LEFT;
              stage.scaleMode = StageScaleMode.NO_SCALE;
              
              _cam = Camera.getCamera();
              _cam.setMode(320, 240, 15);
              _vid = new Video(320, 240);
              _vid.attachCamera(_cam);
              _vid.filters = [new BlurFilter(10, 10, 1)];
              
                          _newFrame = new BitmapData(320, 240, false);
                          addChild(new Bitmap(_newFrame));
                          _oldFrame = _newFrame.clone();
                          _blendFrame = _newFrame.clone();
                          
              _cbRect = new Sprite();
              addChild(_cbRect);
              
              _paddle = new Sprite();
              _paddle.graphics.beginFill(0xffffff);
              _paddle.graphics.drawRect(-100, -20, 200, 40);
              _paddle.graphics.endFill();
              _paddle.x = stage.stageWidth / 2;
              _paddle.y = stage.stageHeight - 50;
              addChild(_paddle);
              
              addEventListener(Event.ENTER_FRAME, onEnterFrame);
                  }
                  
                  private function onEnterFrame(event:Event):void
                  {
                          _blendFrame.draw(_oldFrame);
                          _newFrame.draw(_vid, new Matrix(-1, 0, 0, 1, _newFrame.width, 0));
                          _oldFrame.draw(_newFrame);
                          _blendFrame.draw(_newFrame, null, null, BlendMode.DIFFERENCE);
                          _blendFrame.threshold(_blendFrame, _blendFrame.rect, new Point(), "<", 0x00330000, 0xff000000, 0x00ff0000, true);
                          
              var rect:Rectangle = _blendFrame.getColorBoundsRect(0xffffff, 0, false);
              _cbRect.graphics.clear();
              _cbRect.graphics.lineStyle(1, 0xff0000);
              _cbRect.graphics.drawRect(rect.x, rect.y, rect.width, rect.height);
              
              if(!rect.isEmpty())
              {
                      if(rect.x < _blendFrame.width / 2)
                      {
                              _paddle.x -= 20;
                      }
                      else
                      {
                              _paddle.x += 20;
                      }
                  }
                  }
          }
  }