JezK
Edit File: round_dance.py
""" turtle-example-suite: tdemo_round_dance.py (Needs version 1.1 of the turtle module that comes with Python 3.1) Dancing turtles have a compound shape consisting of a series of triangles of decreasing size. Turtles march along a circle while rotating pairwise in opposite direction, with one exception. Does that breaking of symmetry enhance the attractiveness of the example? Press any key to stop the animation. Technically: demonstrates use of compound shapes, transformation of shapes as well as cloning turtles. The animation is controlled through update(). """ from turtle import * def stop(): global running running = False def main(): global running clearscreen() bgcolor("gray10") tracer(False) shape("triangle") f = 0.793402 phi = 9.064678 s = 5 c = 1 # create compound shape sh = Shape("compound") for i in range(10): shapesize(s) p =get_shapepoly() s *= f c *= f tilt(-phi) sh.addcomponent(p, (c, 0.25, 1-c), "black") register_shape("multitri", sh) # create dancers shapesize(1) shape("multitri") pu() setpos(0, -200) dancers = [] for i in range(180): fd(7) tilt(-4) lt(2) update() if i % 12 == 0: dancers.append(clone()) home() # dance running = True onkeypress(stop) listen() cs = 1 while running: ta = -4 for dancer in dancers: dancer.fd(7) dancer.lt(2) dancer.tilt(ta) ta = -4 if ta > 0 else 2 if cs < 180: right(4) shapesize(cs) cs *= 1.005 update() return "DONE!" if __name__=='__main__': print(main()) mainloop()