cocos2d for iPhone

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

1. 

   domp
   Member

   I have a code that generates a explosion when 2 b2Bodies hit each other, how can I make the explosion? When I want to create a explosion I always get a error named "self was not declared in this scope". Here is my code:

   ContactListener::ContactListener(){};
   
   void ContactListener::BeginContact(b2Contact* contact)
   {
   	b2Fixture* fixtureA = contact->GetFixtureA();
   	CCSprite *actorA = (CCSprite *) fixtureA->GetBody()->GetUserData();
   
   	b2Fixture* fixtureB = contact->GetFixtureB();
   	CCSprite *actorB = (CCSprite *)  fixtureB->GetBody()->GetUserData();
   
   	// Return world box touch
   	if(actorA == nil || actorB == nil) return;
   
   	if(actorA.tag == rocketTag || actorB.tag == rocketTag) [self createExplosion];
           //Error: self was not declared in this scope.
   }

   Maybe there is another way I can run a function in a contact listener?

   Posted 1 year ago #
2. 

   PhilM
   Member

   This may not be the best way (I'd love to hear a simpler method). But the way I did this was have all physics enabled sprites as their own custom class, & they then have relevant methods to trigger code like pop, destroy, whatever.

   So I do something along the lines of:

   b2Fixture* fixtureA = contact->GetFixtureA();
   BubbleSprite *actorA = (BubbleSprite *) fixtureA->GetBody()->GetUserData();
   
   ....
   
   [actorA pop];

   Posted 1 year ago #
3. 

   domp
   Member

   Thanks Philm, but take a look at Ray Wenderlich's way. He checks the collisions in the -tick method, thats better for me:
   http://www.raywenderlich.com/606/how-to-use-box2d-for-just-collision-detection-with-cocos2d-iphone

   Posted 1 year ago #
4. 

   PhilM
   Member

   Thanks for the link, very nice & up to date box2d tutorial. I may change over to use that method too ;)

   Posted 1 year ago #

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