Non-sprite custom classes

freessp · February 2015

Is there a way to create a custom class (a separate .lua file) that simply performs some function? If so, how can it be called?

Let me explain. Currently, I have a projectile with collision detection. If the projectile strikes the enemy, I call an instance of a custom class that counts the number of times the enemy has been hit. If the enemy is hit the proper number of times, then the enemy is removed from the stage through the custom class. It works fine, but to make it work I am doing the following:

If the projectile hits the enemy, then an instance of my custom class is created (currently a Sprite set to invisible) and added to the stage. I then have to remove the invisible sprites from the stage. I am wondering if there is a way to call the custom class without it being a sprite that must be added and removed.

I hope this makes sense.

marcelojunior · February 2015

Hi @freessp

Yes, you can create it using Core.class() without any parameter.

http://docs.giderosmobile.com/classes_in_gideros.html

freessp · February 2015

Thanks for the help marcelojunior. I was trying to do that earlier and could not get it to work properly.

When using sprites, one would use stage:addChild(sprite) to initialize the new instance of the class. How do I properly initialize Core.class()?

keszegh · February 2015

the initialization is done when you create the instance, i.e.
the init function is called when you do
myInstance=myClass.new()
(so in fact adding to stage does not do anything like this)

pie · February 2015

@freessp you init the Sprite with
Sprite.new ()

And add it to stage (or other parent) with addChild.
I presume you just have to use something like:

yourClass = Core.class ()
 
function yourClass:init(params)
--(...)
end
 
--then you initialize it
 
 instancename = yourClass.new (params)

freessp · February 2015

Thanks guys. I was thinking I had to perform another step after

myInstance = myClass.new()

I was thinking that would just create a variable called myInstance which was equal to myClass (like saying a = b), then I would have to do something to make it "happen." I have a tendency to overcomplicate things. Thanks for clearing everything up for me.

marcelojunior · February 2015

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