Comments on: Integrating Chipmunk into Objective C iPhone Games

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By: Eric

Eric — Sat, 18 Jul 2009 23:00:07 +0000

To be honest, Chipmunk isn’t great when you try to add and remove objects very often, so I just add every figure on the screen to Chipmunk as soon as it is ‘live’ and only remove it a half second or so after it dies.

This is because if you try to remove objects during collision events, you get unpredictable crashes. I might be able to make it run a bit smoother by trying to keep Chipmunks objects to a minimum, but I’m scared of trying it out cause playing around with Chipmuck objects led to a LOT of hard-to-track crashes in the beginning that hung around for many weeks.

I’ve found that about 20-30 objects in Chipmunk is all that StickWars will support at once on an 1-gen 400 mhz processor (iPhone 2G, 3G, iPod Touch 1G).

The optimizations I mainly did was to make sure what ever gameplay was going on, I wouldn’t have to create a lot of new objects at once. So I took the trouble to create caches for objects like ‘explosions’ (which are actually additional Chipmunk objects themselves!) as well as the particle animations which represents them visually.

It was a lot more work at first, but now it works nicely as I just keep an array of these objects and my LevelController pulls them in as needed from the cache, or does nothing if the cache is empty (too many explosions going on at once, like 10 or 15).

By: Xun Cai

Xun Cai — Sat, 18 Jul 2009 21:57:14 +0000

Hi Eric,
Thanks for you postings and you game is great.
I have a question about Optimization of Chipmunk.
I am using it to make a game called 9000BC where there are a lot of soldiers.
I am testing the performance now. I noticed that if I have 20 or 30 chipmunk objects (body and shape) in the space, then the speed of the game drop down. Also, sometimes it runs faster sometimes it runs slower.

I notice that your game runs smoothly. Did you add the chipmunk body and shape when you throw the enemies to the sky and remove it from the chipmunk space once done?

Can you tell me some of the strategies you apply to make things run smoothly?

Thanks
Xun Cai

By: Eric

Eric — Thu, 16 Jul 2009 23:45:57 +0000

Okay, I believe you might want to check over a few tutorials about OOP with Objective C. Try http://www.otierney.net/objective-c.html it is pretty good.

Basically, you need the follow the instructions above so that you can call the step: method inside of an object that holds references to the labels you create (make sure to store pointers to the labels when you create them).

By: Sean Carmody

Sean Carmody — Thu, 16 Jul 2009 23:15:51 +0000

Hi Eric,

Excellent job on Stick Wars. I actually have a question on this specific blog subject.

If you are using Chipmunk and you have the “update” function running, how do you update a score from within “update”? I can’t seem to reach any labels that I had set at initialization, and references to “self” don’t work. The labels are not within the “update” function.

Do you have any tips or recommendations?

Thank you

By: Eric

Eric — Wed, 15 Apr 2009 14:01:16 +0000

I don’t quite understand what you mean by a ‘command line’ for the game. However, I will be posting various parts of the source for the game to this website over the next few weeks, so check pack for tips and code samples.

By: Richy

Richy — Wed, 15 Apr 2009 13:30:50 +0000

Hey u r so awesome. Would it be possible if u could send me ur command line on stickwars bcuz I’m trying to make my own game
for the itouch and I’m kinda new at this stuff. Thanx my email address is ammadat@pacbell.net