Demo/turtle/tdemo_wikipedia.py

   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()