Dynamic creation of t2dAnimatedSpirte

#1

function createImage()
{
	
	%TestAnimation = new t2dAnimatedSprite()
   {
      sceneGraph = %this;

You are using a script function (createImage() with no namespace), which does not have a %this parameter sent to it, yet are referencing "%this" when you attempt to assign a sceneGraph. Since in this scope, %this hasn't been defined, it has a value of "", which effectively is setting your sceneGraph to nothing for this object.

You need to provide a valid sceneGraph for the object to be placed within.

#2 Thank you for the quick replay!

I got it to work, but I think i need a little better understanding of "namespace".

function t2dscenegraph::onLevelLoaded(%this)
{
	
	echo("LOADED");
	createImage(%this);
}

calls the global function onLevelLoaded() and gives its "namespace" %this?
it then passes the %this in to the function createImage()?
so, now, i have 2 things called %this. my scenegraph (i think of this as a camera), and my homemade function createImage().

function createImage(%this)
{
	
	%TestAnimation = new t2dAnimatedSprite()
   {
      sceneGraph = %this;
      class = "TestAnimation";
      layer = 0;
      size = "10 10";
      
   };
   
   %TestAnimation.playAnimation("TestAn");
   %TestAnimation.setPositionX(0);
   %TestAnimation.setPositionY(0);
   echo("TestAnimation createImage Function Called");
   
	
	
}

taking the createImage() %this from the onLevelLoaded() function and passing it into the createImage() call function now gives the %this that I was calling in

sceneGraph = %this

the same namespace as my orginal t2dscenegraph::onLevelLoaded()

Am I correct in those assumptions?
I really thank you people for all your help!!!

#3 You are correct in your first statement, but as soon as you call a global script funtion (your "createImage()"), you no longer have a namespace--you are calling a global function.

For the automatic passing of the objectID of the calling object as the first parameter to the receiving function, you need to use a namespace method (also known as a script method), instead of a script function:

function [b]t2dSceneGraph[/b]::createImage([b]%this[/b])
{
	
	%TestAnimation = new t2dAnimatedSprite()
   {
      sceneGraph = %this;
      class = "TestAnimation";
      layer = 0;
      size = "10 10";
      
   };
   
   %TestAnimation.playAnimation("TestAn");
   %TestAnimation.setPositionX(0);
   %TestAnimation.setPositionY(0);
   echo("TestAnimation createImage Function Called");
   
	
	
}

See the difference in how the function is written?

And to call this type of method, you call it on the object itself:

%this.createImage();

The difference is merely in syntax--what you wrote and what I wrote are effectively the same. However, good programming practices indicate that you should use script methods (as opposed to script functions) whenever appropriate--otherwise you will have literally hundreds of global functions, executable by any area of your code, when it's not appropriate.

#4 Thank you Stephen. I understand the global function that you were talking about. %local vs $global was kinda making me screwy, and i had an idea that my 2nd assumption was wrong. (doesnt %local get erased when the function ends?! )

And again thanks for the expanded discussion on Method calls. I am still struggling with hiearchal namespaces like Class vs ObjectID. I come from 3D charchter animation and think about the stuff in a parent/child hiearchy like the bones that make up the char, and how those move. It applies here, kinda.

But lets leave Methods and ObjectID/Class discusion for another post. And for a third time, thanks! You gave me alot better understanding of global function calling.

#5 Karl, a better way to assign the scenegraph would be:

%TestAnimation = new t2dAnimatedSprite()   
{      
   sceneGraph = sceneWindow2D.getSceneGraph();
   class = "TestAnimation";      
   layer = 0;      
   size = "10 10";         
};

sceneWindow2D is defined in mainScreen.gui, and t2dSceneWindow objects have this handly console method available for you to use.