一个最优美的图案。

程序源代码：

#!/usr/bin/python
# -*- coding:
 UTF-8 -*-import mathclass PTS:
    def __init__(self):
        self.x = 0        self.y = 0points = []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()