1 """      turtle-example-suite:

     2 

     3           tdemo_wikipedia3.py

     4 

     5 This example is

     6 inspired by the Wikipedia article on turtle

     7 graphics. (See example wikipedia1 for URLs)

     8 

     9 First we create (ne-1) (i.e. 35 in this

    10 example) copies of our first turtle p.

    11 Then we let them perform their steps in

    12 parallel.

    13 

    14 Followed by a complete undo().

    15 """

    16 from turtle import Screen, Turtle, mainloop

    17 from time import clock, sleep

    18 

    19 def mn_eck(p, ne,sz):

    20     turtlelist = [p]

    21     #create ne-1 additional turtles

    22     for i in range(1,ne):

    23         q = p.clone()

    24         q.rt(360.0/ne)

    25         turtlelist.append(q)

    26         p = q

    27     for i in range(ne):

    28         c = abs(ne/2.0-i)/(ne*.7)

    29         # let those ne turtles make a step

    30         # in parallel:

    31         for t in turtlelist:

    32             t.rt(360./ne)

    33             t.pencolor(1-c,0,c)

    34             t.fd(sz)

    35 

    36 def main():

    37     s = Screen()

    38     s.bgcolor("black")

    39     p=Turtle()

    40     p.speed(0)

    41     p.hideturtle()

    42     p.pencolor("red")

    43     p.pensize(3)

    44 

    45     s.tracer(36,0)

    46 

    47     at = clock()

    48     mn_eck(p, 36, 19)

    49     et = clock()

    50     z1 = et-at

    51 

    52     sleep(1)

    53 

    54     at = clock()

    55     while any([t.undobufferentries() for t in s.turtles()]):

    56         for t in s.turtles():

    57             t.undo()

    58     et = clock()

    59     return "Laufzeit: %.3f sec" % (z1+et-at)

    60 

    61 

    62 if __name__ == '__main__':

    63     msg = main()

    64     print msg

    65     mainloop()