窗体布局: 
控件:timer1   屬性设置:timer1.Interval=1 
代码: 
Dim k As Integer Private Sub Timer1_Timer() k = k + 20 Line (Me.Width / 2, Me.Height / 2)-(0, k), RGB(0, 0, Abs(255 - k / 24)) Line (Me.Width / 2, Me.Height / 2)-(k, 0), RGB(0, 0, Abs(255 - k / 24)) Line (Me.Width / 2, Me.Height / 2)-(k, 0), RGB(0, 0, Abs(255 - k / 24)) Line (Me.Width / 2, Me.Height / 2)-(Me.Width, k), RGB(0, 0, Abs(255 - k / 24)) Line (Me.Width / 2, Me.Height / 2)-(Me.Width, k), RGB(0, 0, Abs(255 - (Me.Height - k) / 24)) Line (Me.Width / 2, Me.Height / 2)-(k, Me.Height), RGB(0, 0, Abs(255 - k / 24)) Line (Me.Width / 2, Me.Height / 2)-(k, Me.Height), RGB(0, 0, Abs(255 - k / 24)) Line (Me.Width / 2, Me.Height / 2)-(0, k), RGB(0, 0, Abs(255 - (Me.Height - k) / 24)) If k > 12500 Then Timer1.Enabled = False 
end if 
End Sub
   
 
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