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File Content: `tdemo_minimal_hanoi.py`

#! /usr/bin/env python
"""       turtle-example-suite:

         tdemo_minimal_hanoi.py

A minimal 'Towers of Hanoi' animation:
A tower of 6 discs is transferred from the
left to the right peg.

An imho quite elegant and concise
implementation using a tower class, which
is derived from the built-in type list.

Discs are turtles with shape "square", but
stretched to rectangles by shapesize()
 ---------------------------------------
       To exit press STOP button
 ---------------------------------------
"""
from turtle import *

class Disc(Turtle):
    def __init__(self, n):
        Turtle.__init__(self, shape="square", visible=False)
        self.pu()
        self.shapesize(1.5, n*1.5, 2) # square-->rectangle
        self.fillcolor(n/6., 0, 1-n/6.)
        self.st()

class Tower(list):
    "Hanoi tower, a subclass of built-in type list"
    def __init__(self, x):
        "create an empty tower. x is x-position of peg"
        self.x = x
    def push(self, d):
        d.setx(self.x)
        d.sety(-150+34*len(self))
        self.append(d)
    def pop(self):
        d = list.pop(self)
        d.sety(150)
        return d

def hanoi(n, from_, with_, to_):
    if n > 0:
        hanoi(n-1, from_, to_, with_)
        to_.push(from_.pop())
        hanoi(n-1, with_, from_, to_)

def play():
    onkey(None,"space")
    clear()
    hanoi(6, t1, t2, t3)
    write("press STOP button to exit",
          align="center", font=("Courier", 16, "bold"))

def main():
    global t1, t2, t3
    ht(); penup(); goto(0, -225)   # writer turtle
    t1 = Tower(-250)
    t2 = Tower(0)
    t3 = Tower(250)
    # make tower of 6 discs
    for i in range(6,0,-1):
        t1.push(Disc(i))
    # prepare spartanic user interface ;-)
    write("press spacebar to start game",
          align="center", font=("Courier", 16, "bold"))
    onkey(play, "space")
    listen()
    return "EVENTLOOP"

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	2438 bytes	0644
tdemo_I_dontlike_tiltdemo.py	1073 bytes	0644
tdemo_I_dontlike_tiltdemo.pyc	1659 bytes	0644
tdemo_I_dontlike_tiltdemo.pyo	1659 bytes	0644
tdemo_bytedesign.py	4219 bytes	0644
tdemo_bytedesign.pyc	5313 bytes	0644
tdemo_bytedesign.pyo	5313 bytes	0644
tdemo_chaos.py	953 bytes	0644
tdemo_chaos.pyc	2297 bytes	0644
tdemo_chaos.pyo	2297 bytes	0644
tdemo_clock.py	3018 bytes	0644
tdemo_clock.pyc	4490 bytes	0644
tdemo_clock.pyo	4490 bytes	0644
tdemo_colormixer.py	1338 bytes	0644
tdemo_colormixer.pyc	2365 bytes	0644
tdemo_colormixer.pyo	2365 bytes	0644
tdemo_fractalcurves.py	3410 bytes	0644
tdemo_fractalcurves.pyc	3524 bytes	0644
tdemo_fractalcurves.pyo	3524 bytes	0644
tdemo_lindenmayer_indian.py	2433 bytes	0644
tdemo_lindenmayer_indian.pyc	3602 bytes	0644
tdemo_lindenmayer_indian.pyo	3602 bytes	0644
tdemo_minimal_hanoi.py	1961 bytes	0644
tdemo_minimal_hanoi.pyc	3589 bytes	0644
tdemo_minimal_hanoi.pyo	3589 bytes	0644
tdemo_nim.py	6588 bytes	0644
tdemo_nim.pyc	9383 bytes	0644
tdemo_nim.pyo	9383 bytes	0644
tdemo_paint.py	1126 bytes	0644
tdemo_paint.pyc	1737 bytes	0644
tdemo_paint.pyo	1737 bytes	0644
tdemo_peace.py	1117 bytes	0644
tdemo_peace.pyc	1443 bytes	0644
tdemo_peace.pyo	1443 bytes	0644
tdemo_penrose.py	3536 bytes	0644
tdemo_penrose.pyc	6005 bytes	0644
tdemo_penrose.pyo	6005 bytes	0644
tdemo_planet_and_moon.py	2840 bytes	0644
tdemo_planet_and_moon.pyc	4548 bytes	0644
tdemo_planet_and_moon.pyo	4548 bytes	0644
tdemo_tree.py	1411 bytes	0644
tdemo_tree.pyc	2123 bytes	0644
tdemo_tree.pyo	2123 bytes	0644
tdemo_wikipedia.py	1347 bytes	0644
tdemo_wikipedia.pyc	1955 bytes	0644
tdemo_wikipedia.pyo	1955 bytes	0644
tdemo_yinyang.py	808 bytes	0644
tdemo_yinyang.pyc	1320 bytes	0644
tdemo_yinyang.pyo	1320 bytes	0644
turtle.cfg	160 bytes	0644
turtleDemo.py	10183 bytes	0644
turtleDemo.pyc	10212 bytes	0644
turtleDemo.pyo	10212 bytes	0644
turtledemo_two_canvases.py	885 bytes	0644
turtledemo_two_canvases.pyc	1252 bytes	0644
turtledemo_two_canvases.pyo	1252 bytes	0644

Name

Size

Permission

Action

about_turtle.txt

3525 bytes

0644