Python 练习实例65

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 = []

def LineToDemo():

   from Tkinter import *

   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()