flash on 2012-3-30

/**
 * Copyright tepe ( http://wonderfl.net/user/tepe )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/8Jrp
 */

package {
    import flash.display.Sprite;
    import flash.geom.*;
    import flash.text.*;
    import flash.events.*;
    public class FlashTest extends Sprite {
        private var s1:Sprite = new Sprite();
        private var field:Sprite = new Sprite();
        public function FlashTest() {
            // write as3 code here..
            addChild(field);
            field.x = 100;
            field.y = 100;
            field.addChild(s1);
            s1.graphics.beginFill(0x000000);
            s1.graphics.drawCircle(0,0,10);
            s1.graphics.endFill();
            s1.x = 20;
            s1.y = 20;
            addEventListener(Event.ENTER_FRAME,onEnter);
        }
        private function onEnter(e:Event):void{
            var pt:Point = new Point(s1.x,s1.y);
            pt = Rotate2(pt,0.1);
            s1.x = pt.x;
            s1.y = pt.y;
        }

    
        private function Rotate2(pt1:Point,alpha:Number):Point{
            var pt2:Point = new Point();
            pt2.x = pt1.x * Math.cos(alpha) - pt1.y * Math.sin(alpha);
            pt2.y = pt1.x * Math.sin(alpha) + pt1.y * Math.cos(alpha);
            return pt2;
        }
    }
}