<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def point_on_screen(self, pos):
 """ Is the point still on the screen? :param pos: Point :type pos: tuple :return: Is it? :rtype: bool """

        if 0 <= pos[0] < self.width and 0 <= pos[1] < self.height:
            return True
        else:
            return False