mirror of https://github.com/python/cpython
79 lines
2.0 KiB
Python
79 lines
2.0 KiB
Python
""" turtle-example-suite:
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tdemo_minimal_hanoi.py
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A minimal 'Towers of Hanoi' animation:
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A tower of 6 discs is transferred from the
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left to the right peg.
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An imho quite elegant and concise
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implementation using a tower class, which
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is derived from the built-in type list.
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Discs are turtles with shape "square", but
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stretched to rectangles by shapesize()
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---------------------------------------
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To exit press STOP button
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---------------------------------------
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"""
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from turtle import *
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class Disc(Turtle):
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def __init__(self, n):
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Turtle.__init__(self, shape="square", visible=False)
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self.pu()
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self.shapesize(1.5, n*1.5, 2) # square-->rectangle
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self.fillcolor(n/6., 0, 1-n/6.)
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self.st()
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class Tower(list):
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"Hanoi tower, a subclass of built-in type list"
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def __init__(self, x):
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"create an empty tower. x is x-position of peg"
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self.x = x
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def push(self, d):
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d.setx(self.x)
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d.sety(-150+34*len(self))
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self.append(d)
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def pop(self):
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d = list.pop(self)
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d.sety(150)
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return d
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def hanoi(n, from_, with_, to_):
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if n > 0:
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hanoi(n-1, from_, to_, with_)
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to_.push(from_.pop())
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hanoi(n-1, with_, from_, to_)
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def play():
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onkey(None,"space")
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clear()
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try:
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hanoi(6, t1, t2, t3)
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write("press STOP button to exit",
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align="center", font=("Courier", 16, "bold"))
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except Terminator:
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pass # turtledemo user pressed STOP
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def main():
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global t1, t2, t3
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ht(); penup(); goto(0, -225) # writer turtle
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t1 = Tower(-250)
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t2 = Tower(0)
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t3 = Tower(250)
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# make tower of 6 discs
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for i in range(6,0,-1):
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t1.push(Disc(i))
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# prepare spartanic user interface ;-)
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write("press spacebar to start game",
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align="center", font=("Courier", 16, "bold"))
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onkey(play, "space")
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listen()
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return "EVENTLOOP"
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if __name__=="__main__":
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msg = main()
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print(msg)
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mainloop()
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