waiting.py

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

KV = '''
#:import chain itertools.chain
#:import pi math.pi
#:import sin math.sin
#:import cos math.cos
#:set X 10

Widget:
    points:
        list(
        chain(*([
        self.center_x + sin((app.time + x * pi / X + pi / 2) * (.5 + .5 * sin(app.time + x * pi / X))) * 100,
        self.center_y + cos((app.time + x * pi / X + pi / 2) * (.5 + .5 * sin(app.time + x * pi / X))) * 100,
        ] for x in range(2 * X))))
    canvas:
        Color:
            rgba: 1, 1, 1, 1
        Line:
            points: self.points or []
            close: True
'''  # noqa


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

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

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


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