mirror of https://github.com/python/cpython
77 lines
1.9 KiB
Python
Executable File
77 lines
1.9 KiB
Python
Executable File
#!/usr/bin/env python3
|
|
""" 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()
|