小的时候大家应该都玩过万花尺，将笔尖放置万花尺内不停的转动，便可以画出一幅精致的线稿图，现在我们不用万花尺，我们通过Python也能绘制出万花尺图案。
（一）代码
#!/usr/bin/python# -*- coding: UTF-8 - *-
import mathclass 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()
（二）实现结果
我们还可以通过修改不同的参数来实现不同的图案转化，大家可以多试试，做出多种不同的效果图。
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