Adobe flash cs4 Game tutorial Enemy Creation

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main time linecode

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);
}

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);
   
  }
 }
}

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+=2;
   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);

     removeEventListener(Event.ENTER_FRAME, loop);
     core.removeChild(this);
    }
   }

  }
  
  public function removeListeners():void {
   removeEventListener(Event.ENTER_FRAME, loop);
  }
 }
}

12 comments:

Kade said...: I really like this tutorial, but is there any chance that you could make an enemy tutorial for platform games? Ive been trying to created enemies for a platform games but I haven't had much luck :(; November 16, 2009 at 7:26 AM
Anonymous said...: I love the tutorial bro, but is there any chance you can make a start screen for the game?; January 5, 2010 at 6:00 AM
JordanDixon said...: Hey, i was wondering why you used core=MovieClip(root);? couldn't you just use root.? i would appreciate you elaborating more on this, its kinda confusing.; January 5, 2010 at 8:58 AM
Waarith Abdul-Majeed said...: root is only a reference to the movie clip. Its like when the operator tells you the phone number, afterward you have to dial it to make use of it.; January 5, 2010 at 9:24 AM
Anonymous said...: yo that enemy creation clip is confusing me. im new to flash and dont know how and where to enter the classes, if you could somehow make that clearer it would really help; February 17, 2010 at 5:23 AM
Unknown said...: your awesome for doin this man..thank you.; February 25, 2010 at 12:01 AM
Anonymous said...: Could you make a tutorial on how to make the enemies shoot and kill you when they hit you, and one on how to keep a score.
great tutorial btw; July 19, 2010 at 4:24 AM
Anonymous said...: awesome tutorial, but I got an error like "TypeError: Error #1010: A term is undefined and has no properties at enemy/loop()". help anyone?; December 11, 2010 at 11:31 PM
jay said...: great stuff i have made a game with the use of your code but i still can not get a score to work with a as3.0 and class scripts any help would be great; January 3, 2011 at 8:03 AM
Anonymous said...: A problem with the enemy action script : (5007: An ActionScript file must have at least one externally visible definition.)

when im trying it; January 8, 2011 at 9:21 AM
Anonymous said...: this tutorial was pretty awesome, but i was wondering how you make a score that goes up automatically like a timer. so a game like cubefield where the score goes up as long as you survive, but at the same time i need the score to be able to go up as you perform actions.

thankss; February 16, 2011 at 6:52 PM
mimi said...: you could place this code inside the [loop function] in the enemy.as to check if the hero has been hit :)

if (hitTestObject(core.sp)){
trace('ship has been hit');
}

you could then add stuffs like if the ship hit the enemy ----game over or something

btw thank you so much Waarith for these awesome tutorials ;); April 7, 2011 at 2:03 AM