7925 - [B]实例065：画组合图形

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题目：一个最优美的图案。
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1. import math
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2. from tkinter import *
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3. 
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4. class PTS:
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5.     def __init__(self):
   
6.         self.x = 0
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7.         self.y = 0
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8. points = []
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9. 
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10. def LineToDemo():
    
11.     screenx = 400
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12.     screeny = 400
    
13.     canvas = Canvas(width = screenx,height = screeny,bg = 'white')
    
14. 
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15.     AspectRatio = 0.85
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16.     MAXPTS = 15
    
17.     h = screeny
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18.     w = screenx
    
19.     xcenter = w / 2
    
20.     ycenter = h / 2
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21.     radius = (h - 30) / (AspectRatio * 2) - 20
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22.     step = 360 / MAXPTS
    
23.     angle = 0.0
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24.     for i in range(MAXPTS):
    
25.         rads = angle * math.pi / 180.0
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26.         p = PTS()
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27.         p.x = xcenter + int(math.cos(rads) * radius)
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28.         p.y = ycenter - int(math.sin(rads) * radius * AspectRatio)
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29.         angle += step
    
30.         points.append(p)
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31.     canvas.create_oval(xcenter - radius,ycenter - radius,
    
32.                        xcenter + radius,ycenter + radius)
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33.     for i in range(MAXPTS):
    
34.         for j in range(i,MAXPTS):
    
35.             canvas.create_line(points[i].x,points[i].y,points[j].x,points[j].y)
    
36. 
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37.     canvas.pack()
    
38.     mainloop()
    
39. if __name__ == '__main__':
    
40.     LineToDemo()

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