private void HandleCollisionEvent(CollisionEvent collisionEvent, Box2DX.Dynamics.ContactPoint point)
{
ContactListeners.ForEach(contactListener =>
{
var isShape1Me = contactListener == point.Shape1.GetBody().GetUserData();
var isShape2Me = contactListener == point.Shape2.GetBody().GetUserData();
var isNotMyBusiness = !isShape1Me && !isShape2Me;
if (isNotMyBusiness)
{
return;
}
var contactPoint = new ContactPoint
{
Velocity = point.Velocity,
Normal = (isShape2Me ? -1 : 1) * point.Normal,
Position = point.Position,
Restitution = point.Restitution,
Friction = point.Friction,
Id = point.ID,
MyShape = isShape1Me ? point.Shape1 : point.Shape2,
OppositeShape = isShape1Me ? point.Shape2 : point.Shape1,
Separation = point.Separation,
};
switch (collisionEvent)
{
case CollisionEvent.Before:
contactListener.OnCollisionBefore(contactPoint);
break;
case CollisionEvent.After:
contactListener.OnCollisionAfter(contactPoint);
break;
default:
throw new ArgumentOutOfRangeException(nameof(collisionEvent), collisionEvent, null);
}
});
}
public override void Remove(Box2DX.Dynamics.ContactPoint point)
{
base.Remove(point);
HandleCollisionEvent(CollisionEvent.After, point);
}
public override void Add(Box2DX.Dynamics.ContactPoint point)
{
base.Add(point);
HandleCollisionEvent(CollisionEvent.Before, point);
}
