Is the point still on the screen?

        :param pos: Point
        :type pos: tuple
        :return: Is it?
        :rtype: bool

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