Math#cos

/**
 * Copyright itkr ( http://wonderfl.net/user/itkr )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/g5Sp
 */

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

    public class Main extends Sprite{

        private var count:int = 0;
        
        public function Main(){
            addEventListener(Event.ENTER_FRAME, foo);
        }

        private function foo(e:Event):void{
            count += Math.PI*2;
            var g:Sprite = new Sprite();
            g.graphics.beginFill(0x000000);
            g.graphics.drawCircle(0, 0, 5);
            g.y = Math.cos(count) * 100 + 230;
            g.x = count;
            addChild(g);
            if(count>460){
                removeEventListener(Event.ENTER_FRAME, foo);
            }
        }
    }
}