Python 练习实例59

题目：画图，综合例子。　　

程序分析：利用for循环控制100-999个数，每个数分解出个位，十位，百位。。

程序源代码：

#!/usr/bin/python

# -*- coding: UTF-8 -*-

if __name__  == '__main__':

   from Tkinter import *

   canvas = Canvas(width = 300,height = 300,bg = 'green')

   canvas.pack(expand = YES,fill = BOTH)

   x0 = 150

   y0 = 100

   canvas.create_oval(x0 - 10,y0 - 10,x0 + 10,y0 + 10)

   canvas.create_oval(x0 - 20,y0 - 20,x0 + 20,y0 + 20)

   canvas.create_oval(x0 - 50,y0 - 50,x0 + 50,y0 + 50)

   import math

   B = 0.809

   for i in range(16):

       a = 2 * math.pi / 16 * i

       x = math.ceil(x0 + 48 * math.cos(a))

       y = math.ceil(y0 + 48 * math.sin(a) * B)

       canvas.create_line(x0,y0,x,y,fill = 'red')

   canvas.create_oval(x0 - 60,y0 - 60,x0 + 60,y0 + 60)

   for k in range(501):

       for i in range(17):

           a = (2 * math.pi / 16) * i + (2 * math.pi / 180) * k

           x = math.ceil(x0 + 48 * math.cos(a))

           y = math.ceil(y0 + 48 + math.sin(a) * B)

           canvas.create_line(x0,y0,x,y,fill = 'red')

       for j in range(51):

           a = (2 * math.pi / 16) * i + (2* math.pi / 180) * k - 1

           x = math.ceil(x0 + 48 * math.cos(a))

           y = math.ceil(y0 + 48 * math.sin(a) * B)

           canvas.create_line(x0,y0,x,y,fill = 'red')

   mainloop()

以上实例输出结果为：