cocos2d for iPhone

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

1. 

   Avizzv92
   Member

   I'm in the process of teaching myself Objective-C (First language I'm thoroughly pursuing, I had a few C++ and VB classes at my school but nothing much). I was glad to find out there is a free game engine that uses Objective-C, makes it easier since I don't need to learn another language so soon.

   I hope to begin developing small games and apps in the coming months and I was wondering... if Cocos2d has the Chipmunk physics engine integrated with it will I be able to use Objective-C with it as well? I saw on Chipmunk's page that it uses C.

   I really haven't found time yet to explore Cocos2d yet, any help is appreciated!

   Posted 2 years ago #
2. 

   Codemattic
   Moderator

   Objective-C is a superset of C. Everything you can do in C, you can do in Objective-C, so you will have to learn some C also. Yes you will have to become familiar with structs and pointers if you want to also use Chipmunk with Cocos. You can also use another physics engine called Box2d with Cocos which is in C++, so thats a choice too. But you will have to learn a few things beyond straight Objective-C. You can do it, Codemattic

   Posted 2 years ago #
3. 

   Avizzv92
   Member

   I'll look into C, say you have a "moderate" (still learning but getting a good understanding of the language) knowledge of Obj-C, how difficult would it be to learn enough C to use Chipmunk.

   I'm taking another C++ class in school next year, so If I get enough in perhaps I can look at Box2d.

   Posted 2 years ago #
4. 

   natanavra
   Member

   Hmmm the usage with C in terms of chipmunk, from my experience, is knowing how do functions work in C compared to Obj-C:
   

   //C
   void main(parameter 1, parameter 2)

   //Obj-C
   - (void)MyFunction:(id)parameter 1 withParm2:(id)parameter2;

   So it's different syntax and Obj-C is OOP, unlike C.
   The only thing I still can't figure out is the chipmunk update method e.g.
   void updateEach(void *ptr, void *unused)

   WTH?!? how can you have a void pointer?!?! void is something empty - there isn't even air. why?!!?? I'd appreciate it if someone explained lol.

   Posted 2 years ago #
5. 

   Clain
   Member

   `//Obj-C
   - (void)MyFunction:(id)parameter 1 withParm2:(id)parameter2;`

   You should not start a function name with a capital letter.

   void updateEach(void *ptr, void *unused)
   WTH?!? how can you have a void pointer?!?! void is something empty - there isn't even air. why?!!?? I'd appreciate it if someone explained lol.

   A void pointer doesn't point to a void. A void pointer is a convention, it means "any kind of pointer". void* in C and id in Obj-C are alike.

   Posted 2 years ago #
6. 

   natanavra
   Member

   Hmmm... as I thought, lol I figured it out a few minutes before reading your post.
   Thank you for the function tip, I usually start with non-capital letters, but I get used to typing capitals almost at the beginning of each word lol...
   So basically a void pointer by my understanding is an Obj-C id right?
   Took me a while to figure that one out on my own lol...

   Posted 2 years ago #
7. 

   Clain
   Member

   So basically a void pointer by my understanding is an Obj-C id right?

   No, it's not. Sorry if I've been a bit unclear. I said they are alike, but they're not the same. id points to an Obj-C object (any kind of Obj-C object). void* can point to anything (an object, an int, a raw memory address, etc). id can't point to an int for example. I hope it's clear now.

   Posted 2 years ago #

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