def METHOD_NAME(self, beam_x, beam_y):
    """
    Sets beam mark position on screen
    #TODO move method to sample_view
    Args:
        beam_x (int): horizontal position in pixels
        beam_y (int): vertical position in pixels
    """
    self._beam_position_on_screen = (beam_x, beam_y)
    self.emit("beamPosChanged", (self._beam_position_on_screen,))