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v0.8.1
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Tip revision: a61d7f2490fd677343c28ac53e1b41cdb0e1d998 authored by Larry Hastings on 04 February 2018, 23:40:38 UTC
Version bump for 3.4.8.
Version bump for 3.4.8.
Tip revision: a61d7f2
tree.py
#!/usr/bin/env python3
""" turtle-example-suite:
tdemo_tree.py
Displays a 'breadth-first-tree' - in contrast
to the classical Logo tree drawing programs,
which use a depth-first-algorithm.
Uses:
(1) a tree-generator, where the drawing is
quasi the side-effect, whereas the generator
always yields None.
(2) Turtle-cloning: At each branching point
the current pen is cloned. So in the end
there are 1024 turtles.
"""
from turtle import Turtle, mainloop
from time import clock
def tree(plist, l, a, f):
""" plist is list of pens
l is length of branch
a is half of the angle between 2 branches
f is factor by which branch is shortened
from level to level."""
if l > 3:
lst = []
for p in plist:
p.forward(l)
q = p.clone()
p.left(a)
q.right(a)
lst.append(p)
lst.append(q)
for x in tree(lst, l*f, a, f):
yield None
def maketree():
p = Turtle()
p.setundobuffer(None)
p.hideturtle()
p.speed(0)
p.getscreen().tracer(30,0)
p.left(90)
p.penup()
p.forward(-210)
p.pendown()
t = tree([p], 200, 65, 0.6375)
for x in t:
pass
print(len(p.getscreen().turtles()))
def main():
a=clock()
maketree()
b=clock()
return "done: %.2f sec." % (b-a)
if __name__ == "__main__":
msg = main()
print(msg)
mainloop()