下面程序是由鼠标事件在窗体上画图，如果按下鼠标将可以画图，双击窗体可以清除所画图形。补充完整下而的程序。
首先在窗体层定义如下变量：
Dim PaintStart As Boolean
编写如下事件过程：
Private Sub Form_Load()
DrawWidth=2
ForeColor=vbGreen
End Sub
Private Sub Form_MouseDown(Button As Integer，Shift As Integer,_X As Single，Y As Single)
PaintStart=True
End Sub
Private Sub Form_MouseMove(Button As Integer，Shift As Integer,_x As Single，Y As Single)
If PaintStart Then
PSet(X,Y)
End If
End Sub
Private Sub Form_MouseUp(Button As Integer，Shift As Integer,_X As Single，Y As Single)
______
End Sub
Private Sub Form-DblClick()
Cls
End Sub