from kivy.app import App
from kivy.clock import Clock
from kivy.properties import NumericProperty
from kivy.lang import Builder


KV = '''
#:import cos math.cos
#:import sin math.sin
#:import chain itertools.chain

Widget:
    points:
        list(
        chain(*
        ((
        cos(x / 100.) * cos(app.time + x) * self.width / 2 + self.width / 2,
        sin(x / 100.) * cos(app.time + x) * self.height / 2 + self.height / 2
        ) for x in range(0, 24 * 314, 4 * 314 / 6))
        ))
    canvas:
        Color:
            rgba: .5, .5, .5, 1
        Line:
            points: self.points or []
            width: 3
'''


class ClockApp(App):
    time = NumericProperty(0)

    def build(self):
        Clock.schedule_interval(self.update_clock, 0)
        self.root = Builder.load_string(KV)
        return self.root

    def update_clock(self, dt):
        self.time += dt


if __name__ == '__main__':
    ClockApp().run()