cocos2d for iPhone

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

1. 

   calaverax
   Member

   Hi everyone! I want to make a Racing Game, TOP/DOWN view. but, i don't know how to check the collisions in the road.

   what i want to do is to make a layer with the background, (included the road). and in a upper layer, make a MASK with some KEY Color, and check in each update the car is inside that mask.

   i want to do this because i want the road with curves and things like that, and i don't know how to check the collision with the road borders.

   anyone have an idea on how to do this?

   Thanks!!!

   P.S: sorry for my poor english. i'm from argentina and don't speak english very well.

   Cheers!

   Posted 2 years ago #
2. 

   TanksArtStudio
   Member

   Hi,
   There is two way to do this.
   1. Using Physics engine. In cocos2D, you can shoose Box2D or Chipmunk. they can do collision detect and a lot of things, just give force or speed to your car, and let the engine do the left. 2D physics engine is very suitable for this kind of top/down view.
   2. Building a matrix to stand for the road. Do NOT detect color for collision or any other things, that is really stupid idea. What you need is to building up a matrix to map with your road. and when your card moved, mark in the matrix. So All that you need to do is to take care of this matrix. easy and simple.

   ----------------------------------------------------------------------------------
   You Need Professional Art Design!

   Posted 2 years ago #
3. 

   calaverax
   Member

   Thanks!!! how can i create the matrix you are saying?
   the physics engine have collision detection over curves? or only in bounding boxes?

   Thanks!

   Posted 2 years ago #
4. 

   TanksArtStudio
   Member

   for physics engine, you can have static curves or even string lines. please try Demo of Chipmunk in cocos2D engine.

   for matrix,it is just like:
   ///////////////
   #define kXNumber 480
   #define kYNumber 320
   int racingField[kXNumber][kYNumber];

   /////////////
   this matrix take 153kByte of memory, you can make it smaller if you do not need so detail a confflision detect. just like this:
   #define kXNumber (480/4)
   #define kYNumber (320/4)

   Suggest you using chipmunk or box2D.

   ---------------------------------
   You Need Professional Art Desgin

   Posted 2 years ago #
5. 

   calaverax
   Member

   i cant understand what you are trying to say...

   this is only a matrix declaration.

   #define kXNumber 480
   #define kYNumber 320
   int racingField[kXNumber][kYNumber];

   i don't want to do the game with tiles, and, i want curved lines.
   i see the chipmunk example but all the physics is with boxes, no curve lines.

   Thanks!

   Posted 2 years ago #
6. 

   PhilM
   Member

   Ernesto has a great post on the old forums about reading the colour values of images, and constructing a collision map (or a matrix, as TanksArtStudio calls it).

   http://groups.google.com/group/cocos2d-iphone-discuss/browse_thread/thread/f6e734e00d863f5e/6c2e8d6494f8a2ef#6c2e8d6494f8a2ef

   You could also go the physics engine route, I'd have a play with both methods and see what works best for you.

   Posted 2 years ago #
7. 

   TanksArtStudio
   Member

   For using curve in chipmunk, please reference this game.

   http://www.cocos2d-iphone.org/forum/topic/1135

   there are promotion codes, you can download to have a try.

   --------------------------------------
   You need professional Art Design

   Posted 2 years ago #
8. 

   Steve Oldmeadow
   Administrator

   @TanksArtStudio - your studio's art work is amazing, some of the best I've seen. You should post a thread in the "Everything Else" group to let people know about your studio. It is great that you list the costs on your web site.

   Posted 2 years ago #
9. 

   Codemattic
   Moderator

   I agree with Steve! Its good stuff. And thanks for being upfront about pricing. Please post some examples of your artwork in the forum! I wish we had a separate board for that.

   edit: ok, I see that you have already :)

   Posted 2 years ago #
10. 

    TanksArtStudio
    Member

    @Steve Oldmeadow & Codemattic, Thank you! Let me do it step by step. I will post some pictures later.

    @calaverax, here is a video of a demo of chipmunk application, there are lots of interesting possibilities.
    http://files.slembcke.net/chipmunk/movies/sketches.mov
    Here is the home page of chipmunk: http://code.google.com/p/chipmunk-physics/

    Posted 2 years ago #

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