python 练习实例65

python 编程100例

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()

以上实例输出结果为：

python 编程100例