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- #!/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()
- try:
- hanoi(6, t1, t2, t3)
- write("press STOP button to exit",
- align="center", font=("Courier", 16, "bold"))
- except Terminator:
- pass # turtledemo user pressed STOP
- 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()
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