[Admins]

Ok I understand, don't know why the function should care about the rotation of the colliding line though, since movements must be linear anyway (by setting positions explicitely or using the move command).
The simpliest way would probably be to just check for the tiles by script (several onwall checks along the line in steps of 1 tile). That way you can also theoretically detect diagonal walls. I can add some command for easier collision detection though, but it should be made so that it can be used for many different cases of collision.