class CollisionManager:
""" Helper class to manage connections between colliders and collisions """
def __init__(self, collisions):
""" Initialize the Collision Manager with the list of collisions to manage """
self.collidablePairToCollision = {collision.collidablePair:collision for collision in collisions}
self.idToCollider = {}
self.idProvider = Incrementer(startAt=1)
def start(self):
""" Start the collision Manager by binding the Collision Callbacks """
self.startCallback = CollisionCallback(self.performCollisionStart)
Box2DEngine.Collision_SetStartCallback(self.startCallback)
self.stopCallback = CollisionCallback(self.performCollisionStop)
Box2DEngine.Collision_SetStopCallback(self.stopCallback)
def register(self, collider):
""" Register the collider """
id = self.idProvider.send(None)
collider.id = id
self.idToCollider[id] = collider
def performCollisionStart(self, id1, id2):
""" Perform the collision """
collision, firstCollider, secondCollider = self.findCollision(id1, id2)
if collision:
collision.startCollision(firstCollider, secondCollider)
def performCollisionStop(self, id1, id2):
""" Perform the collision """
collision, firstCollider, secondCollider = self.findCollision(id1, id2)
if collision:
collision.stopCollision(firstCollider, secondCollider)
def findCollision(self, id1, id2):
""" Return the collision """
collider1 = self.idToCollider[id1]
collider2 = self.idToCollider[id2]
possiblePairs = collider1.pairs.intersection(collider2.pairs)
for pair in possiblePairs:
actingPair = CollidablePair(collider1.pairToRegistration[pair].actsAs, collider2.pairToRegistration[pair].actsAs)
if actingPair == pair:
collision = self.collidablePairToCollision[pair]
if actingPair.first == pair.first:
return collision, collider1, collider2
else:
return collision, collider2, collider1
else:
return None, None, None
def __init__(self, collisions):
""" Initialize the Collision Manager with the list of collisions to manage """
self.collidablePairToCollision = {collision.collidablePair:collision for collision in collisions}
self.idToCollider = {}
self.idProvider = Incrementer(startAt=1)
