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Hi,
I noticed that when I add a collision pair function:
cpSpaceAddCollisionPairFunction(space, 0, 1, &damage, self);
The collision loses it's physics attributes, I mean - I want to detect a collision between two shapes and do something like decrease health value or something like that, but keep the physics.
Simply put, a ball hits an enemy, the enemy loses health, the ball bounces off the enemy.
Thanks in advance,
Natan Avra.
In the collision pair function:
if you return 1: they will collide and bounce off
if you return 0: they won't.
Korki696
Member
Hey natanavra,
after the collision pair function you can either do: return 0; or return 1;. return0; will let the objects just pass through and not really collide, while return 1 will have them collide. What i did with my game is i made the collision pair function and inside of it i did this:
static int damage(cpShape *a, cpShape *b, cpContact *contacts, int numContacts, cpFloat normal_coef, void *data)
{
ActiveLayer *active = (ActiveLayer*) data;
[active damage:a shapeB:b contacts:contacts];
return 1;
}then later on i have something like this:
-(void) playerToEnemySnowball: (cpShape *)shapeA shapeB:(cpShape *)shapeB contacts:(cpContact *) contacts {
playerSprite.health -= 10;
}Having the collision callback call a function in the actual implementation of the layer will give you a little more control with what happens to the objects.
-Lars
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