First time here? First time here? Newsletter Signup Newsletter
Login | Register | 651326 Members and growing!
Search tutorials
Author: Luke Knepper | Website:

Now, in the tank symbol, insert the following code (F9) :

onClipEvent(enterFrame) {
if(this._x<=0) this._x=2; //0 is the left boundary for my invader, you may want to change your's
if(this._x>=580) this._x=478; //480 is the right boundary, feel free to change!
if(this._x>80 && this._x<480) { //just to make sure that the ship is in a valid position
if (Key.isDown (Key.RIGHT) ) { //right key is down
this._x+=5 //5 is the speed, this moves the clip 5 to the right
else if (Key.isDown (Key.LEFT) ) {
this._x-=5 // moves the clip 5 to the left

if(Key.isDown (Key.SPACE) ) { //space key is down

if(_root.bullet._y>600) { //checks to see if the bullet is off the screen (so you can fire again)
bullet._x=this._x //sets the bullet's x to your x

bullet._y=this._y //sets the bullet's y to your y

} //end the onClipEvent handler

Now, in the bullet symbol, put this code:

onClipEvent(enterFrame) {

this._y+=10 //moves the bullet 10 up


And in the ship put this code:

onClipEvent(load) {
this._y=-100-random(500) //sets the ships y to a random position (-100 -> -600)
this._x=random(600) //sets the ships x to a random position (0 -> 600)
onClipEvent(enterFrame) {
if(this._y<=0) { //if this is below the y border; //subtract 10 from the health
this._y+=3 //moves the ship by 3
if (this.hitTest(_root.bullet)) { //if this gets hit by the bullet
_root.score+=10 //increase the score by 10
//you could make the ship go to it's explode animation if you had one
this._y=-100-random(500) //sets the y random
this._x=random(600)//sets the x random

if(<=0) {



Next we will wrap up all your questions about the code.

» Level Basic

Added: 2006-12-13
Rating: 4.18 Votes: 49
(10 being the highest)
» Author
Luke is an active Java, PHP, and Flash programmer, website designer, and game developer. Has much programming experience.
» Download
Download the files used in this tutorial.
» Forums
More help? Search our boards for quick answers!


  • There are no comments yet. Be the first to comment!

  • You must have javascript enabled in order to post comments.

Leave a Comment
  • Your email address will not be published. All fields are required.
Featured Flash FLA
» Author: Inocreato
» Title: RaiseTheBlocks
» Description: Raise all the blocks to win the game
Featured Sound Loops
Image for equalize

Audio Player

» Author: TomCat Carty
» Title: The Wood
» Description: Just a little game ending or it can maybe be looped. Recorders with music box and percussion to give the feel of well, I don't know, the woods? Free to use, just credit me. thank you
Latest Font
» Author: Fábio FAFERS
» Description: I created this font for free use. Everyone can apply it in personal or business texts. Its free, but I want to be communicated in case of business use. Donations are accepted to keep the project of free fonts alive! Thank you all
Featured Sound Fx
Image for equalize

Audio Player

» Author: Davisigner
» Description: Hmm... what to say about this one? It's reminiscent of the closing notes of the opening music from the Three Stooges done in a church organ style with a closing cymbal crash. I'll give this one away gratis, but feel free to check out my free loops and potential upcoming license-mandated ones over in the respective part of Flashkit.