Python经典编程习题100例：第59例：画图，综合例子

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from tkinter import *
    canvas = Canvas(width = 300,height = 300,bg = 'green')
    canvas.pack(expand = YES,fill = BOTH)
    x0 = 150
    y0 = 100
    canvas.create_oval(x0 - 10,y0 - 10,x0 + 10,y0 + 10)
    canvas.create_oval(x0 - 20,y0 - 20,x0 + 20,y0 + 20)
    canvas.create_oval(x0 - 50,y0 - 50,x0 + 50,y0 + 50)
    import math
    B = 0.809
    for i in range(16):
        a = 2 * math.pi / 16 * i
        x = math.ceil(x0 + 48 * math.cos(a))
        y = math.ceil(y0 + 48 * math.sin(a) * B)
        canvas.create_line(x0,y0,x,y,fill = 'red')
    canvas.create_oval(x0 - 60,y0 - 60,x0 + 60,y0 + 60)
    for k in range(501):
        for i in range(17):
            a = (2 * math.pi / 16) * i + (2 * math.pi / 180) * k
            x = math.ceil(x0 + 48 * math.cos(a))
            y = math.ceil(y0 + 48 + math.sin(a) * B)
            canvas.create_line(x0,y0,x,y,fill = 'red')
        for j in range(51):
            a = (2 * math.pi / 16) * i + (2* math.pi / 180) * k - 1
            x = math.ceil(x0 + 48 * math.cos(a))
            y = math.ceil(y0 + 48 * math.sin(a) * B)
            canvas.create_line(x0,y0,x,y,fill = 'red')
    mainloop()