Adobe flash cs4 Game tutorial Explosion

In this tutorial you will learn how make explosions with your enemies. You'll learn how to make the explosion animation.
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timeline code var sfx_gun:Sound = new sfx(); var sp:MovieClip = new ship(); var tm:Timer = new Timer(1500); tm.addEventListener(TimerEvent.TIMER, onstart); var bulletholder:Sprite = new Sprite(); addChild(bulletholder); addChild(sp); addEventListener(Event.ENTER_FRAME,onenter); stage.addEventListener(MouseEvent.CLICK,onclick); tm.start(); function onstart(e:Event){ var em:Sprite = new enemy(); em.x= Math.random()*550; addChild(em); } function onenter(e:Event):void { sp.x-=(sp.x-mouseX)*.1; sp.y-=(sp.y-350)*.2; } function onclick(e:Event) { sfx_gun.play(); sp.y=365; var bl:Sprite = new bullet(); bl.y=sp.y; bl.x=sp.x; bulletholder.addChild(bl); } enemy class package { import flash.events.Event; import flash.display.MovieClip; import flash.display.Sprite; public class enemy extends Sprite { private var core:Object; public function enemy() { addEventListener(Event.ADDED_TO_STAGE,onadd); } private function onadd(e:Event) { core=MovieClip(root); addEventListener(Event.ENTER_FRAME,loop); } private function loop(e:Event) { y+=3; //var dis:Number = Math.abs(y-core.sp.y)/20; //bd.htmlText='<font color="#ffffff">'+dis+'</font>'; //y-=((y-core.sp.y)/dis); //x-=((x-core.sp.x)/dis); for (var i:int = 0; i<core.bulletholder.numChildren; i++) { var bulletTarget:Sprite=core.bulletholder.getChildAt(i); if (hitTestObject(bulletTarget)) { core.bulletholder.getChildAt(i).removeListeners(); core.bulletholder.removeChild(bulletTarget); var boom:MovieClip = new explosion(); boom.x=x; boom.y=y; stage.addChild(boom); removeEventListener(Event.ENTER_FRAME, loop); core.removeChild(this); } } } public function removeListeners():void { removeEventListener(Event.ENTER_FRAME, loop); } } } bullet class package { import flash.display.Sprite; import flash.events.Event; public class bullet extends Sprite { private var sw:Number; private var sh:Number; private const _SPEED:int=10; private const _OFFSTAGE:int=-10; public function bullet():void { addEventListener(Event.ADDED_TO_STAGE,onadd); } private function onadd(e:Event):void { sw=stage.stageWidth; sh=stage.stageHeight; addEventListener(Event.ENTER_FRAME,loop); } private function loop(e:Event):void { if (y<_OFFSTAGE) { removeEventListener(Event.ENTER_FRAME,loop); parent.removeChild(this); } y-=_SPEED; } public function removeListeners():void { removeEventListener(Event.ENTER_FRAME,loop); } } } explosion class package { import flash.display.MovieClip; import flash.events.Event; import flash.media.Sound; public class explosion extends MovieClip { private var hit:Sound = new sfx_hit(); public function explosion() { addEventListener(Event.ENTER_FRAME,xkill); hit.play(); } private function xkill(e:Event) { if (currentFrame==framesLoaded) { removeEventListener(Event.ENTER_FRAME,xkill); parent.removeChild(this); } } } }