学习这个还挺有意思的！

编写程序代码如下：

Public TopBottom,LeftRight As String
Private Sub Form_Click()
If Timer1.Enabled = False Then
Timer1.Enabled = True
Else
Timer1.Enabled = False
End If
End Sub
Private Sub Form_KeyPress(KeyAscii As Integer)
Select Case KeyAscii
Case 61
Timer1.Interval = 10
Case 45
Timer1.Interval = 100
End Select
End Sub
Private Sub Form_Load()
TopBottom = "0"
LeftRight = "0"
End Sub

Private Sub Timer1_Timer()
Select Case TopBottom & LeftRight
Case "00"
Form1.Image1.Top = Form1.Image1.Top - 10
Form1.Image1.Left = Form1.Image1.Left - 10
Form1.Image1.Move _
Form1.Image1.Left - 10,Form1.Image1.Top - 10
If Form1.Image1.Top <= 0 Then
TopBottom = "1"
End If
If Form1.Image1.Left <= 0 Then
LeftRight = "1"
End If
Case "10"
Form1.Image1.Top = Form1.Image1.Top + 10
Form1.Image1.Left = Form1.Image1.Left - 10
If Form1.Image1.Top >= _
Form1.ScaleHeight - Form1.Image1.Height Then
TopBottom = "0"
End If
If Form1.Image1.Left <= 0 Then
LeftRight = "1"
End If
Case "01"
Form1.Image1.Top = Form1.Image1.Top - 10
Form1.Image1.Left = Form1.Image1.Left + 10
If Form1.Image1.Top <= 0 Then
TopBottom = "1"
End If
If Form1.Image1.Left >= _
Form1.ScaleWidth - Form1.Image1.Width Then
TopBottom = "0"
End If
Case "11"
Form1.Image1.Top = Form1.Image1.Top + 10
Form1.Image1.Left = Form1.Image1.Left + 10
If Form1.Image1.Top >= _
Form1.ScaleHeight - Form1.Image1.Height Then
TopBottom = "0"
End If
If Form1.Image1.Left >= _
Form1.ScaleWidth - Form1.Image1.Width Then
LeftRight = "0"
End If
End Select
End Sub