cocos2d for iPhone

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

1. 

   superlag0731
   Member

   void MyContactListener:: BeginContact (b2Contact * contact) {

   / / We need to copy out the data because the b2Contact passed in

   / / Is reused.

   CCSprite * spriteA = (CCSprite *) contact-> GetFixtureA () -> GetBody () -> GetUserData ();

   CCSprite * spriteB = (CCSprite *) contact-> GetFixtureB () -> GetBody () -> GetUserData ();

   / / General box collision

   if (spriteA.tag == 1 & & spriteB.tag == 5)

   box2d after the collision event can only be defined in ContactListener it?
   That is, if (spriteA.tag == 1 & & spriteB.tag == 5) if the event assigned in "gamelayer" assigned? ?

   Posted 5 months ago #
2. 

   ksjogo
   Member

   I can only assume things because your question is not clear.
   - box2d after the collision event can only be defined in ContactListener it? -
   No, the ContactListener is only the first thing to get called. Itself can call other objects. In my games I add the contacts to the actors and later let the actors handle collisions themselves.

   General advice: Do NOT use hardcoded tags. Either #define them or use a enum.

   Posted 5 months ago #
3. 

   superlag0731
   Member

   hi~
   thank ur answer:)
   ur right!
   I just mean
   how can I assign event to after the contact but not in My "ContactListener"
   i need put in the like "HelloWorldLayer.mm"
   because I need to do the calculation like "int hp" or need to play the animation for sprite...

   do u hvae any simple way or sample code for me?
   thank u very much:)

   Posted 5 months ago #
4. 

   ksjogo
   Member

   I have no sample code for you because I believe learning by doing in this basic things is better. If you can understand the why of a code and not just the copy/paste how, it is better. :)

   A simple way:
   1: Add an instance variable to your ContactListener in ContactListener.h.
   2: Set this after you created the ContactListener in your HelloWorldLayer.mm
   3: Expose some contact methods in HelloWorldLayer.h
   4: Import HelloWorldLayer.h in ContactListener.mm
   5: On the right contact call [instanceVariable exposedMethod:param1]

   Posted 5 months ago #
5. 

   superlag0731
   Member

   appreciate for ur help:）
   I will try to understand the why of a code:)

   Posted 5 months ago #

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