the rotating rectangle

/**
 * Copyright o8que ( http://wonderfl.net/user/o8que )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/qdjL
 */

package {
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.events.MouseEvent;
    
    [SWF(width="465",height="465",frameRate="60",backgroundColor="0xFFFFFF")]
    public class Main extends Sprite {
        
        public function Main() {
            var rect:Sprite = new Sprite();
            rect.graphics.beginFill(0xFF0000);
            rect.graphics.drawRect( -80, -80, 160, 160);
            rect.graphics.endFill();
            rect.x = 232, rect.y = 232;
            addChild(rect);
            addEventListener(Event.ENTER_FRAME,
                function(event:Event):void { rect.rotation += 2; }
            );
            
            var circleContainer:Sprite = new Sprite();
            var circleX:Array = [162, 302, 162, 302];
            var circleY:Array = [162, 162, 302, 302];
            for (var i:int = 0; i < 4; i++) {
                var circle:Sprite = new Sprite();
                circle.graphics.beginFill(0x000000);
                circle.graphics.drawCircle(0, 0, 60);
                circle.graphics.endFill();
                circle.x = circleX[i], circle.y = circleY[i];
                circle.buttonMode = true;
                circleContainer.addChild(circle);
            }
            addChild(circleContainer);
            circleContainer.addEventListener(MouseEvent.MOUSE_DOWN,
                function(event:MouseEvent):void { event.target.startDrag(); }
            );
            circleContainer.addEventListener(MouseEvent.MOUSE_UP,
                function(event:MouseEvent):void { event.target.stopDrag(); }
            );
        }
    }
}