Rotating a Red Box in Pyglet

rotating_box_pyglet.py

import pyglet


CYCLE = 30.


def degrees_from_time(t):
    """
    Get the degrees to rotate, which is:
    percentage_of_cycle_complete = time_elapsed_in_cycle / cycle_length
    degrees_to_rotate = percentage_of_cycle_complete * 360
    """
    t = t % CYCLE
    return t / CYCLE * 360


def main():
    global time_elapsed
    
    box_img = pyglet.image.load('red-box-200.png')
    box = pyglet.sprite.Sprite(box_img, x=100, y=100)
    
    window = pyglet.window.Window()
    pyglet.clock.set_fps_limit(60)
    
    time_elapsed = 0
    
    @window.event
    def on_draw():
        global time_elapsed
        time_elapsed += pyglet.clock.tick()
        print time_elapsed
        box.rotation = degrees_from_time(time_elapsed)
        box.draw()
    
    pyglet.app.run()


if __name__ == '__main__':
    main()