Sine wave

/**
 * Copyright Tosakun.Meeting ( http://wonderfl.net/user/Tosakun.Meeting )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/piB8
 */

package{
     import flash.display.Sprite;
     import flash.events.Event;
           import flash.events.TimerEvent;
           import flash.utils.Timer;

    public class SineWaveMoving extends Sprite{
                        private var _xRadius:Number = 100; /**** ****/
                        private var _angle:Number=45; /**** degree ****/ 
                        private var _yRadius:Number=150;
                        private var _speed:Number=10;

                public function SineWaveMoving(){
                        this.drawMe();
                        this.setPosition(0,400);
                        var timer:Timer  = new Timer(50,0);
                        timer.addEventListener("timer",moveMe);
                        timer.start();
                }
               public function setPosition(x:Number,y:Number):void{
                       this.x=x;
                       this.y=y;
               }

               private function drawMe():void{
                      /**** to draw a red circle with 50 pixels radias ****/
                          this.graphics.beginFill(0xFF0000,200);
                          this.graphics.drawCircle(0,0,10);
                          this.graphics.endFill();
               }
 
              private function moveMe(e:TimerEvent):void{
                  this.y=200+Math.sin(_angle)*_yRadius;
                  //this.y=200+Math.sin(_angle)*_yRadius;
                  this.x+=_speed;
                  this._angle+=0.5;
              }
    }
}