1 import turtle
2
3 class Stack:
4 def __init__(self):
5 self.items = []
6 def isEmpty(self):
7 return len(self.items) == 0
8 def push(self, item):
9 self.items.append(item)
10 def pop(self):
11 return self.items.pop()
12 def peek(self):
13 if not self.isEmpty():
14 return self.items[len(self.items) - 1]
15 def size(self):
16 return len(self.items)
17
18 def drawpole_3():#画出汉诺塔的poles
19 t = turtle.Turtle()
20 t.hideturtle()
21 def drawpole_1(k):
22 t.up()
23 t.pensize(10)
24 t.speed(100)
25 t.goto(200*(k-1), 100)
26 t.down()
27 t.goto(200*(k-1), -100)
28 t.goto(200*(k-1)-20, -100)
29 t.goto(200*(k-1)+20, -100)
30 drawpole_1(0)#画出汉诺塔的poles[0]
31 drawpole_1(1)#画出汉诺塔的poles[1]
32 drawpole_1(2)#画出汉诺塔的poles[2]
33
34 def creat_plates(n):#制造n个盘子
35 plates=[turtle.Turtle() for i in range(n)]
36 for i in range(n):
37 plates[i].up()
38
39 plates[i].hideturtle()
40 plates[i].shape("square")
41 plates[i].shapesize(1,8-i)
42 plates[i].goto(-200,-90+20*i)
43 plates[i].showturtle()
44 return plates
45
46 def pole_stack():#制造poles的栈
47 poles=[Stack() for i in range(3)]
48 return poles
49
50 def moveDisk(plates,poles,fp,tp):#把poles[fp]顶端的盘子plates[mov]从poles[fp]移到poles[tp]
51 mov=poles[fp].peek()
52 plates[mov].goto((fp-1)*200,150)
53 plates[mov].goto((tp-1)*200,150)
54 l=poles[tp].size()#确定移动到底部的高度（恰好放在原来最上面的盘子上面）
55 plates[mov].goto((tp-1)*200,-90+20*l)
56
57 def moveTower(plates,poles,height,fromPole, toPole, withPole):#递归放盘子
58 if height >= 1:
59 moveTower(plates,poles,height-1,fromPole,withPole,toPole)
60 moveDisk(plates,poles,fromPole,toPole)
61 poles[toPole].push(poles[fromPole].pop())
62 moveTower(plates,poles,height-1,withPole,toPole,fromPole)
63
64 myscreen=turtle.Screen()
65 drawpole_3()
66 n=int(input("请输入汉诺塔的层数并回车:\n"))#修改汉诺塔的层数
67 plates=creat_plates(n)
68 poles=pole_stack()
69 for i in range(n):
70 poles[0].push(i)
71 moveTower(plates,poles,n,0,2,1)
72 myscreen.exitonclick()
