remove array when touch a movieClip (hitTestObject)

[Stephdidou]

Hi all,

I'm making an AS3 platform game.

My player can shoot bullets. If a bullet touch an enemy, it will be removed.

for (var j:int = 0; j < bulletList.length; j++) // for each bullet in the bulletList
  {
  if (enemies.mc.hitTestObject(bulletList) ){
  trace("Bullet and Enemy are colliding");
  enemyDie(i)
  bulletList.removeSelf();
  }

But now I'd like to remove the bullet if it touch a movieClip on the stage (with the instance "tree_mc"). And I can't figure out how to do so...

I've tried this :

var tree_mc;
for (var j:int = 0; j < bulletList.length; j++){
if(tree_mc.hitTestObject(bulletList)){
  trace("bullet hit tree");
  }

But it's not working.

Do you know how I can do that ?

Thank you

[Ned Murphy]

Do not declare the tree_mc variable (get rid of line 01).  Creating a new variable is not gong to be the same tree_mc. 

[Stephdidou]

Ok, but I do so I've got this error : error 1120: Access of undefined property

[Ned Murphy]

Ok, don't.   If you mean you removed that line then the problem is likely that you did not name the tree_mc that name, or it is otherwise not present when the code executes.  What is the entire error message?

[Stephdidou]

I could put

private var tree_mc:MovieClip;

at the begining of my class, but it stills make an error : Error #1009: Cannot access a property or method of a null object reference.

(it for the line if     (tree_mc.hitTestObject(bulletList)){     )

Do you know why ?

[Amy Blankenship]

Stephdidou wrote:

I could put

private var tree_mc:MovieClip;

If you scope your variable as private, Flash doesn't have access to put the MovieClip in there when it makes it.Make it public, and remove the untyped re-declaration of tree_mc in your function.

[Stephdidou]

I've named the instance of the movieClip "tree_mc". (but I' haven't made a linkage for the MovieClip)

[Ned Murphy]

If the class file is not your document class file then you need to provide the class with a reference to the tree_mc object from wherever it exists.  Where is the tree created?

[Stephdidou]

The class file is "Main.as". I've only got this class for my project.

I've drag the MovieClip "tree" on the stage and put the instance name "tree_mc".

Then I've put in my Main.as  : private var tree_mc:MovieClip; 

[Ned Murphy]

You do not want to declare a new tree_mc object if you already have one on the stage.  You need to be sure to declare the class file as your document class, otherwise anything you place on the stage manually will not be seen by the class.

[Stephdidou]

All right.

So, I've got this movieClip (the black rectangle) on my stage with the instance tree_mc

Then in my Main.as I've put :

public function checkCollisions() {
for (var j:int = 0; j < bulletList.length; j++){ 
if(tree_mc.hitTestObject(bulletList)){ 
  trace("bullet hit tree"); 
  } 
  }

But then I've got Error 1120 Access of undefined property tree_mc

So I'm adding the variable "tree_mc" :

public function checkCollisions() {
var tree_mc;
for (var j:int = 0; j < bulletList.length; j++){  
if(tree_mc.hitTestObject(bulletList)){  
  trace("bullet hit tree");  
  }  
  }

The game is launching without error.

But when the function checkCollisions is called I've got this error  :

Error #1010: A term is undefined and has no properties. (for the line 4)

Do you know what could be the problem ?

[Ned Murphy]

Show where you have assigned the Main.as file as your document class file.

[Stephdidou]

[Stephdidou · Accepted solution]

Found the problem !

Here what I did :

tree = new Object();

tree.mc = gamelevel.tree;

for (var j:int = 0; j < bulletList.length; j++){ 

if(tree.mc.hitTestObject(bulletList)){ 

  trace("bullet hit tree"); 

  }