7924 - [C]实例064：画椭圆、矩形

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题目：利用ellipse 和 rectangle 画图。
程序分析：无。
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1. if __name__ == '__main__':
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2.     from tkinter import *
   
3.     canvas = Canvas(width = 400,height = 600,bg = 'white')
   
4.     left = 20
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5.     right = 50
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6.     top = 50
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7.     num = 15
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8.     for i in range(num):
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9.         canvas.create_oval(250 - right,250 - left,250 + right,250 + left)
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10.         canvas.create_oval(250 - 20,250 - top,250 + 20,250 + top)
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11.         canvas.create_rectangle(20 - 2 * i,20 - 2 * i,10 * (i + 2),10 * ( i + 2))
    
12.         right += 5
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13.         left += 5
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14.         top += 10
    
15. 
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16.     canvas.pack()
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17.     mainloop()

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