def calc_position(self, s):
    '\n        calc position\n        '
    x = self.sx.calc(s)
    y = self.sy.calc(s)
    return (x, y)
calc position
def calc_position(self, s):
    '\n        \n        '
    x = self.sx.calc(s)
    y = self.sy.calc(s)
    return (x, y)