Python学习笔记489

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__':

   fromTkinterimport*

   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()