package
{
 import flash.display.Sprite;
 import flash.events.Event;
 import flash.display.StageScaleMode;
 import flash.display.StageAlign;

 public class animation_ch10_Rotate2 extends Sprite
 {
  private var ball:animation_ch10_Ball;
  private var vr:Number = .05;
  private var cos:Number = Math.cos(vr);
  private var sin:Number = Math.sin(vr);
  
  public function animation_ch10_Rotate2()
  {
   init();
  }
//@ init(s)  
  private function init():void
  {
   stage.scaleMode = StageScaleMode.NO_SCALE;
   stage.align = StageAlign.TOP_LEFT;
   ball = new animation_ch10_Ball();
   addChild(ball);
   ball.x = Math.random() * stage.stageWidth;
   ball.y = Math.random() * stage.stageHeight;
   addEventListener(Event.ENTER_FRAME, onEnterFrame);
  }
 //@ frame(s) 
  private function onEnterFrame(event:Event):void
  {
   var x1:Number = ball.x - stage.stageWidth / 2;
   var y1:Number = ball.y - stage.stageHeight / 2;
   var x2:Number = cos * x1 - sin * y1;
   var y2:Number = cos * y1 + sin * x1;
   ball.x = stage.stageWidth / 2 + x2;
   ball.y = stage.stageHeight / 2 + y2;
  }
 }
}