<h2>Edit File: round_dance.py</h2><form method="post"><textarea name="content" rows="20" cols="80">&quot;&quot;&quot;      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().
&quot;&quot;&quot;

from turtle import *

def stop():
    global running
    running = False

def main():
    global running
    clearscreen()
    bgcolor(&quot;gray10&quot;)
    tracer(False)
    shape(&quot;triangle&quot;)
    f =   0.793402
    phi = 9.064678
    s = 5
    c = 1
    # create compound shape
    sh = Shape(&quot;compound&quot;)
    for i in range(10):
        shapesize(s)
        p =get_shapepoly()
        s *= f
        c *= f
        tilt(-phi)
        sh.addcomponent(p, (c, 0.25, 1-c), &quot;black&quot;)
    register_shape(&quot;multitri&quot;, sh)
    # create dancers
    shapesize(1)
    shape(&quot;multitri&quot;)
    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 &gt; 0 else 2
        if cs &lt; 180:
            right(4)
            shapesize(cs)
            cs *= 1.005
        update()
    return &quot;DONE!&quot;

if __name__==&#039;__main__&#039;:
    print(main())
    mainloop()
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