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