private void OnCollisionStart(NodeCollisionStartEventArgs e)
{
//validate
if (IsGripping)
{
return;
}
if (e.OtherNode == Node.Parent)
{
return;
}
if (OtherGripper != null && (e.OtherNode == OtherGripper.Node || e.OtherNode == OtherGripper.Node.Parent))
{
return;
}
//register the node as touching
if (!_touchingNodes.ContainsKey(e.OtherNode))
{
_touchingNodes.Add(e.OtherNode, e);
}
//determine if other gripper is touching the item too
if (OtherGripper != null)
{
if (e.OtherBody.Mass != 0) // don't grip immovable objects
{
if (OtherGripper.IsTouchingNode(e.OtherNode))
{
Grip(e);
OtherGripper.Grip(e);
}
}
}
}
private void OnCollisionEnd(NodeCollisionEndEventArgs e)
{
//unregister the node as touching
if (_touchingNodes.ContainsKey(e.OtherNode))
{
_touchingNodes.Remove(e.OtherNode);
}
//release grip
if (IsGripping && !ProducesConstraint && (e.OtherNode == _gripping || _gripping.IsDeleted))
{
ReleaseGrip();
OtherGripper?.ReleaseGrip();
}
}