Box2D Forums

CGSize screenSize = [[CCDirector sharedDirector] winSize];
   float randomOffset = CCRANDOM_0_1() * 10.0f - 5.0f;
   CGPoint startPos = CGPointMake(screenSize.width - 15 + randomOffset, 80);
   
   NSString* spriteFrameName = @"sprite.png";
   CCSprite* tempSprite = [CCSprite spriteWithSpriteFrameName:spriteFrameName];
   
   b2PolygonShape shape;
   float hx = (tempSprite.contentSize.width / PTM_RATIO) * 0.5f;
    float hy = (tempSprite.contentSize.height / PTM_RATIO) * 0.5f;
   shape.SetAsBox(hx,hy);
   
    // Create a body definition and set it to be a dynamic body
    b2BodyDef bodyDef;
    bodyDef.type = b2_dynamicBody;
    bodyDef.position = [Helper toMeters:startPos];
    bodyDef.angularDamping = 1.0f;

    // Define the dynamic body fixture.
    b2FixtureDef fixtureDef;
    fixtureDef.shape = &shape;
    fixtureDef.density = 0.01f;
    fixtureDef.friction = 1.0f;
    fixtureDef.restitution = 0.3f;

    [super createBodyInWorld:world bodyDef:&bodyDef fixtureDef:&fixtureDef spriteFrameName:spriteFrameName];
   
    // Create a body definition and set it to be a dynamic body
    b2BodyDef body2Def;
    body2Def.type = b2_dynamicBody;
    body2Def.position = [Helper toMeters:startPos];
    body2Def.fixedRotation = TRUE;
    b2Body* body2 = world->CreateBody(&body2Def);
   body2->SetUserData(self);
    b2MassData md;
    body2->GetMassData(&md);
    md.mass = 0.01f;
    body2->SetMassData(&md);

-(void) createBodyInWorld:(b2World*)world bodyDef:(b2BodyDef*)bodyDef fixtureDef:(b2FixtureDef*)fixtureDef spriteFrameName:(NSString*)spriteFrameName
{
   NSAssert(world != NULL, @"world is null!");
   NSAssert(bodyDef != NULL, @"bodyDef is null!");
   NSAssert(spriteFrameName != nil, @"spriteFrameName is nil!");
   
   [self removeSprite];
   [self removeBody];
   
   CCSpriteBatchNode* batch = [[LevelTerrain sharedLevel] getSpriteBatch];
   sprite = [CCSprite spriteWithSpriteFrameName:spriteFrameName];
   [batch addChild:sprite];
   
   body = world->CreateBody(bodyDef);
   body->SetUserData(self);
   
   if (fixtureDef != NULL)
   {
      body->CreateFixture(fixtureDef);
   }
}