Python学习笔记495

题目：一个最优美的图案。　　

程序分析：无。

程序源代码：

#!/usr/bin/python

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

import math

class PTS:

   def __init__(self):

       self.x =0

       self.y =0

points =[]

defLineToDemo():

   fromTkinterimport*

   screenx =400

   screeny =400

   canvas =Canvas(width = screenx,height = screeny,bg ='white')

   AspectRatio=0.85

   MAXPTS =15

   h = screeny

   w = screenx

   xcenter = w /2

   ycenter = h /2

   radius =(h -30)/(AspectRatio*2)-20

   step =360/ MAXPTS

   angle =0.0

   for i in range(MAXPTS):

       rads = angle * math.pi /180.0

       p = PTS()

       p.x = xcenter +int(math.cos(rads)* radius)

       p.y = ycenter -int(math.sin(rads)* radius *AspectRatio)

       angle += step

       points.append(p)

   canvas.create_oval(xcenter - radius,ycenter - radius,

                      xcenter + radius,ycenter + radius)

   for i in range(MAXPTS):

       for j in range(i,MAXPTS):

           canvas.create_line(points[i].x,points[i].y,points[j].x,points[j].y)

   canvas.pack()

   mainloop()

if __name__ =='__main__':

   LineToDemo()