//thanks hiiragi package { import flash.display.Sprite; import flash.events.Event; public class Oscillation extends Sprite { private var _sprite:Sprite; private var _angle:Number =94; private var _radius:Number =100; public function Oscillation(){ _sprite = new Sprite(); _sprite.graphics.beginFill(0x9900ff,100); _sprite.graphics.drawCircle(100,100,25); _sprite.graphics.endFill(); _sprite.x=0; _sprite.y=100; addChild(_sprite); addEventListener(Event.ENTER_FRAME,onEnterFrame); } public function onEnterFrame(event:Event):void { _sprite.x=200 + Math.sin(_angle)*_radius; _sprite.y=200 + Math.cos(_angle)*_radius; _angle += .05; } } }