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jpayne@69
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1 #!/usr/bin/env python3
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2 """ turtle-example-suite:
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3
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4 tdemo_minimal_hanoi.py
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5
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jpayne@69
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6 A minimal 'Towers of Hanoi' animation:
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7 A tower of 6 discs is transferred from the
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8 left to the right peg.
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9
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10 An imho quite elegant and concise
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11 implementation using a tower class, which
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12 is derived from the built-in type list.
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13
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14 Discs are turtles with shape "square", but
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15 stretched to rectangles by shapesize()
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16 ---------------------------------------
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17 To exit press STOP button
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18 ---------------------------------------
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19 """
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20 from turtle import *
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21
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22 class Disc(Turtle):
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23 def __init__(self, n):
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24 Turtle.__init__(self, shape="square", visible=False)
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25 self.pu()
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26 self.shapesize(1.5, n*1.5, 2) # square-->rectangle
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27 self.fillcolor(n/6., 0, 1-n/6.)
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28 self.st()
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29
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30 class Tower(list):
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jpayne@69
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31 "Hanoi tower, a subclass of built-in type list"
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32 def __init__(self, x):
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33 "create an empty tower. x is x-position of peg"
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34 self.x = x
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35 def push(self, d):
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36 d.setx(self.x)
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37 d.sety(-150+34*len(self))
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38 self.append(d)
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39 def pop(self):
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40 d = list.pop(self)
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41 d.sety(150)
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42 return d
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43
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44 def hanoi(n, from_, with_, to_):
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45 if n > 0:
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46 hanoi(n-1, from_, to_, with_)
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47 to_.push(from_.pop())
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48 hanoi(n-1, with_, from_, to_)
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49
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50 def play():
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51 onkey(None,"space")
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52 clear()
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53 try:
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54 hanoi(6, t1, t2, t3)
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55 write("press STOP button to exit",
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56 align="center", font=("Courier", 16, "bold"))
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57 except Terminator:
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58 pass # turtledemo user pressed STOP
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59
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60 def main():
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61 global t1, t2, t3
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62 ht(); penup(); goto(0, -225) # writer turtle
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63 t1 = Tower(-250)
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64 t2 = Tower(0)
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65 t3 = Tower(250)
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66 # make tower of 6 discs
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67 for i in range(6,0,-1):
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68 t1.push(Disc(i))
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69 # prepare spartanic user interface ;-)
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70 write("press spacebar to start game",
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71 align="center", font=("Courier", 16, "bold"))
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72 onkey(play, "space")
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73 listen()
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74 return "EVENTLOOP"
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75
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76 if __name__=="__main__":
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77 msg = main()
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78 print(msg)
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79 mainloop()
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