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""" turtle-example-suite:
tdemo_wikipedia3.py
This example is
inspired by the Wikipedia article on turtle
graphics. (See example wikipedia1 for URLs)
First we create (ne-1) (i.e. 35 in this
example) copies of our first turtle p.
Then we let them perform their steps in
parallel.
Followed by a complete undo().
"""
from turtle import Screen, Turtle, mainloop
from time import clock, sleep
def mn_eck(p, ne,sz):
turtlelist = [p]
#create ne-1 additional turtles
for i in range(1,ne):
q = p.clone()
q.rt(360.0/ne)
turtlelist.append(q)
p = q
for i in range(ne):
c = abs(ne/2.0-i)/(ne*.7)
# let those ne turtles make a step
# in parallel:
for t in turtlelist:
t.rt(360./ne)
t.pencolor(1-c,0,c)
t.fd(sz)
def main():
s = Screen()
s.bgcolor("black")
p=Turtle()
p.speed(0)
p.hideturtle()
p.pencolor("red")
p.pensize(3)
s.tracer(36,0)
at = clock()
mn_eck(p, 36, 19)
et = clock()
z1 = et-at
sleep(1)
at = clock()
while any([t.undobufferentries() for t in s.turtles()]):
for t in s.turtles():
t.undo()
et = clock()
return "Laufzeit: %.3f sec" % (z1+et-at)
if __name__ == '__main__':
msg = main()
print msg
mainloop()