VB. net 怎样让panel做的画图板缩小化再打开后画的图还在？
下面是我的代码，请问要怎么修改才可以呢？
谢谢大家了！
Public Class Form1
Dim mygraphics As Graphics
Dim Mypen As Pen
Dim Draw As Boolean = False
Dim Start As Point
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
mygraphics = Me.pnlPaint.CreateGraphics
Mypen = New Pen(Color.Black,10)
pnlPaint.BackColor=Color.Black
End Sub
Private Sub Form1_FormClosing(sender As Object, e As FormClosingEventArgs) Handles Me.FormClosing
mygraphics.Dispose()
Mypen.Dispose()
End Sub
Private Sub btnColor1_Click(sender As Object, e As EventArgs) Handles btnColor1.Click
Mypen.Color = Color.White
End Sub
Private Sub pnlPaint_MouseMove(sender As Object, e As MouseEventArgs) Handles pnlPaint.MouseMove
If e.Button And MouseButtons.Left Then
pnlPaint.CreateGraphics.DrawLine(Mypen, Start.X, Start.Y, e.X, e.Y)
End If
Start = e.Location
End Sub
Private Sub pnlPaint_MouseUp(sender As Object, e As MouseEventArgs) Handles pnlPaint.MouseUp
Draw = False
End Sub
Private Sub pnlPaint_MouseDown(sender As Object, e As MouseEventArgs) Handles pnlPaint.MouseDown
Draw = True
End Sub
End Class
