def registerEventHandlers(self):
        """
        Registers the motion and drag handlers.
        
        Note that because of the way pyglet treats mouse dragging, there is also an handler registered to the on_mouse_drag event.
        """
        self.world.registerEventHandler("on_mouse_motion",self.on_mouse_motion)
        self.world.registerEventHandler("on_mouse_drag",self.on_mouse_drag)