Is it possible to get a count of all of the "objects" that get rendered

techdojo · September 2012

Or even considered to be rendered

I'm trying to optimise my app and I'm noticing some slowdown, especially when I've been navigating between the different scenes and accessing list views etc.

When I leave a scene I always set the parent Sprite object to be not visible, but it seems that even though the object is invisible the fact that it's still in the hierarchy is having a penalty on render speed.

Is there an easy way to get a count of all the children attached to the stage so I can see where I might need to do some removals?

MikeHart · September 2012

Look in the code subforum, i posted a function there that counts childobjects of an objects.

talis · September 2012

@MikeHart sorry to ask but i can not understand where or what is code subforum? Can you describe it for me?
Thanks.

GregBUG · September 2012

may be "Code Snippets" ?

look here
http://www.giderosmobile.com/forum/discussion/318/snippet-count-total-children-of-a-parent#Item_1

talis · September 2012

aha ok my bad i was thinking is there another subforum where people are posting codes etc:D I have to always keep in midn to think simple:D

MikeHart · September 2012

@talis: Yes, code snippets. @Gregbug posted the link to it.

techdojo · September 2012

Cheers Mike, thanks for your help

(and @GregBUG for the link of course)

techdojo · September 2012

UPDATE : Interesting, by the time I walked through the various "scenes" of my app I'd have over 2500 objects floating around, although granted the vast majority were either off screen or assigned to a high level "scene" that was set invisible.

Hmmm ... Time to re-visit the scene manager code and make sure that once a scene is not active it's actually removed from the stage - I already do this if I want to destroy the scene on exit but not if I want to keep it so I can switch back and forth (like on my tab view control)

I'd be interested to see what kind of processing and code is run on a display object (Sprite or child of a sprite) even when it's invisible - are it's children still processed?

atilim · September 2012

It a sprite is invisible, drawing system doesn't traverse children of it. But they still continue to receive mouse/touch events. In your case, it's better to remove the page and keep your scene hierarchy simple.

btw, what is your test device?

techdojo · September 2012

Currently I'm testing on a 3rd Gen iPod Touch, although I do have access to a 4th gen retina display one as well.

Is there a reason why invisible objects still receive touch events?

atilim · September 2012

Because invisibility should only effect the visual state of the Sprite and nothing else. Btw, I sometimes use stage:setAlpha(0.5) to see if there is something behind.

techdojo · September 2012

Fair point I suppose, I'm going to make sure all the unused objects are actually REMOVED from the stage, so it's only the ENTER_FRAME event handlers I have to worry about.

Thanks for the help

atilim · September 2012

You're welcome

As you know, with ADDED_TO_STAGE/REMOVED_FROM_STAGE events, you also don't need to worry about ENTER_FRAME

techdojo · September 2012

@mells just mentioned them on the other thread - I'd forgotten about ADDED_TO_STAGE

john26 · September 2012

Of course another option would be to nil out unused sprites as well as removing them from stage. This should destroy all event handlers associated with the sprite and also free up texture memory:

  mysprite:removeFromParent()
  mysprite=nil

Please correct me if I am wrong on this!

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