Math & Physics Sample

/**
 * Copyright dfrm ( http://wonderfl.net/user/dfrm )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/ywLe
 */

package {
    import flash.display.Sprite;
    import flash.events.Event;
    public class FlashTest extends Sprite {
        
        var rd:Number;
        var ball:Sprite;
        
        public function FlashTest() {
            // write as3 code here..
            drawBall(10);
            rd=0;
            stage.addEventListener(Event.ENTER_FRAME, _onEnterFrame);
        }
        
        private function _onEnterFrame(e:Event):void{
            rd += 0.05;
            if(rd > 10) rd = 0;
            
            ball.x = stage.mouseX;
            ball.y = stage.mouseY;
            ball.scaleX = ball.scaleY = rd;
        }
        
        private function drawBall(r:Number):void{
            ball = new Sprite();
            ball.graphics.beginFill(0x000000,1);
            ball.graphics.drawCircle(0,0,r);
            ball.graphics.endFill();
            addChild(ball);
        }
    }
}