Demos : Multitouch

Code:

<html>
<head>
     <script type="text/javascript" src="//lib.ivank.net/ivank.js"></script>
     <script type="text/javascript">
          var stage;
          var balls = [];
          
          // Every touch has its own ID (touchPointID). 
          // Touch may change position and event targets, but it still has the same ID.
          
          function Start()
          {
               stage = new Stage("c");
               
               var bd = new BitmapData("ball.png");
               for(var i=0; i<20; i++)
               {
                    var b = new Bitmap(bd);
                    b.x = Math.random()*stage.stageWidth;
                    b.y = Math.random()*stage.stageHeight;
                    stage.addChild(b);
                    balls.push(b);
                    b.addEventListener(TouchEvent.TOUCH_BEGIN, onTB );
               }
               stage.addEventListener(TouchEvent.TOUCH_MOVE, onTM );
               stage.addEventListener(TouchEvent.TOUCH_END , onTE );
          }
          
          function onTB (e){ e.target.tID = e.touchPointID; }
          function onTE (e)
          {
               var b; 	// get the ball with the right touch ID
               for(var i=0; i<balls.length; i++) if(balls[i].tID == e.touchPointID) b = balls[i];  
               if(!b) return;	
               b.tID = -1;
          }
          function onTM (e)
          {
               var b;  // get the ball with the right touch ID
               for(var i=0; i<balls.length; i++) if(balls[i].tID == e.touchPointID) b = balls[i];
               if(!b) return;	
               b.x = e.stageX - 50;
               b.y = e.stageY - 50;
          }
     </script>
</head>
<body onload="Start();"><canvas id="c"></canvas></body>
</html>