Python语言的魅力------完美图案

1.画椭圆
（代码如下）

  #!user/bin/python
  # -*- conding:UTF-8 -*-
 if __name__ == '__main__':
     from Tkinter import *
     canvas = Canvas(width=800,height=600,bg='purple')
     canvas.pack(expand=YES,fill=BOTH)
     k = 1
     j = 1
 for i in range(0,26):
     canvas.create_oval(310 - k,250 - k,310 + k,250 + k,width=1)
     k += j
     j +=0.3
mainloop()

2.画方形
（代码入下）

#!/usr/bin/python
# -*- coding: UTF-8 -*-
if __name__ == '__main__':
    from Tkinter import *
    root = Tk()
    root.title('Canvas')
    canvas = Canvas(root, width=400, height=400, bg='yellow')
    x0 = 263
    y0 = 263
    y1 = 275
    x1 = 275
    for i in range(19):
       canvas.create_rectangle(x0, y0, x1, y1)
        x0 -= 5
        y0 -= 5
        x1 += 5
        y1 += 5
    canvas.pack()
    root.mainloop()

3.一个像鸟巢一样优美的图案
（代码如下）

#!/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()