用两个椭圆编写的动画循环能否仅用一个椭圆来实现解决方案？

Question

解决方案显示的可见部分包含一个椭圆，该椭圆与右侧的表单边框交叉并立即出现在左侧。我用两个省略号编写了代码。我需要一个提示，如果解决方案只能用一个椭圆书写。无需添加其他控件即可复制和粘贴代码。

Public Class Form1
Dim WithEvents t As New Timer() With {.Interval = 50}
Dim UFO As Integer
Dim reachTheotherSide As Integer
Dim counter As Integer

Private Sub t_Tick(sender As Object, e As EventArgs) Handles t.Tick
    reachTheotherSide += 1
    counter += 1

    If reachTheotherSide >= 198 Then
        UFO += 1
    End If

    If reachTheotherSide >= 250 And UFO = 45 Then
        reachTheotherSide = 45
    End If

    If UFO = 45 Then
        UFO = -87
    End If

    If counter = 285 Then
        Threading.Thread.Sleep(1000)
        counter = 0
    End If

    Me.Invalidate()
End Sub

Private Sub Form1_Load(sender As Object, e As System.EventArgs) Handles Me.Load
    DoubleBuffered = True
    CenterToScreen()
    t.Start()
    UFO = -87
    reachTheotherSide = 45
End Sub

Private Sub Form1_Paint(sender As Object, e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
    e.Graphics.SmoothingMode = Drawing2D.SmoothingMode.AntiAlias
    e.Graphics.DrawEllipse(New Pen(Color.Black, 0), UFO, 87, 86, 86)
    e.Graphics.DrawEllipse(New Pen(Color.Black, 0), reachTheotherSide, 87, 86, 86)
End Sub
End Class