how to rotate my tween in the center of the container - Javascript Canvas

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Description

how to rotate my tween in the center of the container

Demo Code

ResultView the demo in separate window 

<html>
   <head> 
      <title>Centering with the Registration Point </title> 
      <meta name="viewport" content="width=device-width, initial-scale=1"> 
      <script type="text/javascript" src="https://code.createjs.com/createjs-2015.05.21.combined.js"></script> 
      <script type="text/javascript">
    window.onload=function(){//ww  w.  j av  a 2 s.  c  o m
var stage = new createjs.Stage("canvas");
createjs.Ticker.on("tick", tick);
var container = new createjs.Container();
stage.addChild(container);
var containerWidth = 100;
var containerHeight = 100;
var bounds = new createjs.Shape();
bounds.graphics.f("#eee").dr(0,0,containerWidth,containerHeight);
container.addChild(bounds);
var shape = new createjs.Shape();
shape.graphics.f("#f00").drawRect(0,0,50,50);
container.addChild(shape);
shape.x = containerWidth/2;
shape.y = containerHeight/2;
shape.regX = 25;
shape.regY = 25;
createjs.Tween.get(shape).to({rotation:360}, 3000);
function tick(event) {
    stage.update(event);
}
    }

      </script> 
   </head> 
   <body> 
      <canvas id="canvas" width="800" height="600"></canvas>  
   </body>
</html>

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