画折线出问题了？高手指点一下
运行可以但是没显示在form上建立一个picture控件，在这个控件里面花折线，，，，，谁能指点一下？
代码如下：
Dim x1, y1, x2, y2, left_c As Integer
Private Sub Form_Load()
left_c = 0
End Sub
Private Sub Picture1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
If Button = 1 Then
left_c = 0
Else
If left_c = 0 Then
x1 = X
y1 = Y
left_c = 1
Else
x2 = X
y2 = Y
Picture1.Line (x1, y1)-(x2, y2)
End If
End If
End Sub
