cocos2d for iPhone

A fast, easy to use, free, and community supported 2D game engine

1. 

   chad
   Member

   Hi cocos2d gurus,

   I'm running into an out-of-sync problem when I try to apply the same action to multiple sprites at the same time. This is basically what I did:

   [spriteA runAction: fadeOutAction];
   [spriteB runAction: fadeOutAction];
   [spriteC runAction: fadeOutAction];

   When the code runs in the emulator, it's quite noticeable that one sprite fades out slightly faster.
   I wonder what the best practice is to synchronize the animations.

   Thanks!
   Chad

   Posted 2 years ago #
2. 

   gaminghorror
   Member

   If you do this on 3 different sprites it will run equally fast. I assume that you're experiencing one sprite fading out faster simply because its colors are closer to the background colors.

   For example, if you background is black, and you have 3 sprites with gray color of 50%, 75% and 90% white you'll notice the 50% sprite will disappear first.

   Posted 2 years ago #
3. 

   chad
   Member

   Thanks Steffen! But my sprites initially looked the same. It's just that at the end of the animation, the sprites don't disappear simultaneously -- the interval is tiny but noticeable especially on the device.

   Posted 2 years ago #
4. 

   shadaz
   Member

   When I tried to sync multiple sprites I had same issues. Instead of 3 runActions like you have, for the important times I needed 100% sync, I made my own timer and I made all the changes happen at the same time.

   // just example...
   [self schedule: @selector(fadeout:)];
   
   -(void)fadeout
   {
       spriteA.opacity = x
       spriteB.opacity = x
       spriteC.opacity = x
   }

   Posted 2 years ago #
5. 

   chad
   Member

   Thanks shadaz! That's a clever work-around. Does "self" refer to the parent of all sprites in your code example?

   Another approach I was going to try out is combining all synchronous CCActions into one that updates multiple sprites. Pretty hacky, though.

   Posted 2 years ago #

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