You can check it by using the TestPoint function available for the Fixtures.
- (void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *myTouch = [touches anyObject];
CGPoint location = [myTouch locationInView:[myTouch view]];
location = [[CCDirector sharedDirector] convertToGL:location];
b2Vec2 locationWorld = b2Vec2(location.x/PTM_RATIO, location.y/PTM_RATIO);
for (b2Body *b = world->GetBodyList(); b; b = b->GetNext())
{
b2Fixture *f = b->GetFixtureList();
CCSprite *sprite =(CCSprite *) b->GetUserData();
if(sprite != NULL)
{ //Here there should be a userData (sprite) for this to work.
if(f -> TestPoint(locationWorld))
{
NSLog(@"You touched a body");
if (sprite.tag == 3)
{
//do something on touching a specific body.
}
}
}
}
}