cocos2d for iPhone

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

1. 

   hkmars
   Member

   Hi,

   In my game, I have around 10 monsters (AtlasSprite) walking around the screen randomly.

   I'm using MoveTo action with a timer to change the target position every few seconds for each monster. It work, but the performance is not acceptable (dropped to 30fps) when I added to around 30 monsters.

   I think the problem is that I create the MoveTo action everytime the monster need to change the target position.

   I want to create the action during the init phase, but how can I reuse the pre-created action with random position?

   Please help. Thanks a lot!

   Posted 2 years ago #
2. 

   Clain
   Member

   You could subclass MoveTo or add a category to it. You just need a setter for the endPosition ivar. Just before reusing your action, set endPosition to your new random position. Then run the action and voilà.

   Posted 2 years ago #
3. 

   jd
   Member

   If you are going to handle collisions on those monsters, you may want to use chipmunk for their movements. I started off with moveTo's in my game but eventually switched to chipmunk and I think the performance is better.

   Posted 2 years ago #
4. 

   hkmars
   Member

   Thanks Clain, I will try to subclass MoveTo.

   Posted 2 years ago #
5. 

   hkmars
   Member

   jd, I'm also interested the chipmunk method, as I need to handle collisions on those monsters.

   However, I don't know much on chipmunk... how to handle the "MoveTo" in chipmunk? Is it change the gravity of each monster?

   Thanks

   Posted 2 years ago #
6. 

   pabloruiz55
   Member

   Hi, to move the object with chipmunk you would apply impulses/forces. You won't be able to handle the movement so "directly" as with the MoveTo function though.
   You could create a method that "simulates" the MoveTo function, like if you wanted to move an object to point (100,100) in 2 seconds, you could calculate the required amount of impulse to make the object reach that point in 2 seconds.

   Posted 2 years ago #
7. 

   hkmars
   Member

   Thanks pabloruiz55, it seems more difficult than using MoveTo.. so is it worth to change it for the performance reason?

   I have another question about using the MoveTo...

   Is the following code create a new MoveTo Action?
   ------------
   [s runAction:[MoveTo actionWithDuration:1 position:ccp(100,100)]];
   ------------

   Is it different to the following code?
   ------------
   id action = [MoveTo actionWithDuration:1 position:ccp(100,100)]
   [s runAction:action];
   ------------

   Posted 2 years ago #
8. 

   pabloruiz55
   Member

   hi hkmars, changing to chipmunk/box2d is not just a matter of performance, its about how you would handle other stuff like collisions, objects movements,etc. If you are using MoveTo in your game logic, later on you will run into problems most likely.

   I have another question about using the MoveTo...

   Is the following code create a new MoveTo Action?
   ------------
   [s runAction:[MoveTo actionWithDuration:1 position:ccp(100,100)]];
   ------------

   Is it different to the following code?
   ------------
   id action = [MoveTo actionWithDuration:1 position:ccp(100,100)]
   [s runAction:action];

   Yes, it is the same.

   Posted 2 years ago #

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