#!/usr/bin/python
# -*- coding: UTF-8 -*-

"""
题目:一个最优美的图案。 
"""

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()