## tCircles

```#!/usr/bin/env python
#
# [SNIPPET_NAME: tCircles]
# [SNIPPET_CATEGORIES: PyTurtle]
# [SNIPPET_DESCRIPTION: Use turtle to draw a circular design.]
# [SNIPPET_DOCS: http://docs.python.org/library/turtle.html]
# [SNIPPET_AUTHOR: Grant Bowman <[email protected]>]

"""      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]
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()

```