/usr/lib/python3.7/turtledemo/round_dance.py is in python3.7-examples 3.7.0~b3-1.
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The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 | """ 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()
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