def cursor_event(self, x, y, dx, dy):
self.sys_camera.rot_state(x, y)<EOL>
The standard mouse movement event method.
Can be overriden to add new functionality.
By default this feeds the system camera with new values.

Args:
    x: The current mouse x position
    y: The current mouse y position
    dx: Delta x postion (x position difference from the previous event)
    dy: Delta y postion (y position difference from the previous event)