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File Content: `tdemo_tree.py`

#! /usr/bin/python2.7
"""      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.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()

Name	Size	Permission
about_turtle.txt	3525 bytes	0644
about_turtledemo.txt	302 bytes	0644
demohelp.txt	3034 bytes	0644
tdemo_I_dontlike_tiltdemo.py	1073 bytes	0755
tdemo_I_dontlike_tiltdemo.pyc	1660 bytes	0644
tdemo_I_dontlike_tiltdemo.pyo	1660 bytes	0644
tdemo_bytedesign.py	4218 bytes	0755
tdemo_bytedesign.pyc	5313 bytes	0644
tdemo_bytedesign.pyo	5313 bytes	0644
tdemo_chaos.py	951 bytes	0644
tdemo_chaos.pyc	2296 bytes	0644
tdemo_chaos.pyo	2296 bytes	0644
tdemo_clock.py	3219 bytes	0755
tdemo_clock.pyc	4535 bytes	0644
tdemo_clock.pyo	4535 bytes	0644
tdemo_colormixer.py	1338 bytes	0644
tdemo_colormixer.pyc	2365 bytes	0644
tdemo_colormixer.pyo	2365 bytes	0644
tdemo_fractalcurves.py	3409 bytes	0755
tdemo_fractalcurves.pyc	3524 bytes	0644
tdemo_fractalcurves.pyo	3524 bytes	0644
tdemo_lindenmayer_indian.py	2432 bytes	0755
tdemo_lindenmayer_indian.pyc	3602 bytes	0644
tdemo_lindenmayer_indian.pyo	3602 bytes	0644
tdemo_minimal_hanoi.py	2049 bytes	0755
tdemo_minimal_hanoi.pyc	3623 bytes	0644
tdemo_minimal_hanoi.pyo	3623 bytes	0644
tdemo_nim.py	6514 bytes	0644
tdemo_nim.pyc	9384 bytes	0644
tdemo_nim.pyo	9384 bytes	0644
tdemo_paint.py	1289 bytes	0755
tdemo_paint.pyc	1901 bytes	0644
tdemo_paint.pyo	1901 bytes	0644
tdemo_peace.py	1065 bytes	0755
tdemo_peace.pyc	1388 bytes	0644
tdemo_peace.pyo	1388 bytes	0644
tdemo_penrose.py	3535 bytes	0755
tdemo_penrose.pyc	6005 bytes	0644
tdemo_penrose.pyo	6005 bytes	0644
tdemo_planet_and_moon.py	2823 bytes	0755
tdemo_planet_and_moon.pyc	4535 bytes	0644
tdemo_planet_and_moon.pyo	4535 bytes	0644
tdemo_tree.py	1410 bytes	0755
tdemo_tree.pyc	2123 bytes	0644
tdemo_tree.pyo	2123 bytes	0644
tdemo_two_canvases.py	1120 bytes	0644
tdemo_two_canvases.pyc	1635 bytes	0644
tdemo_two_canvases.pyo	1635 bytes	0644
tdemo_wikipedia.py	1347 bytes	0644
tdemo_wikipedia.pyc	1955 bytes	0644
tdemo_wikipedia.pyo	1955 bytes	0644
tdemo_yinyang.py	807 bytes	0755
tdemo_yinyang.pyc	1320 bytes	0644
tdemo_yinyang.pyo	1320 bytes	0644
turtle.cfg	160 bytes	0644
turtleDemo.py	10091 bytes	0755
turtleDemo.pyc	10948 bytes	0644
turtleDemo.pyo	10948 bytes	0644

Name

Size

Permission

Action

about_turtle.txt

3525 bytes

0644