我目前想的方法是,建立2个窗体级变量,一个保存Graphics,一个保存Bmp
无论怎么绘制图片,实际上都存在Bmp了
重绘的时候,再把这个Bmp绘制出来。 @H_404_0@不过重绘随时都在发生,对性能有影响,看怎么取舍吧。
Dim g As Graphics Dim bmp As Bitmap Private Sub Form6_Load(sender As Object,e As EventArgs) Handles MyBase.Load bmp = New Bitmap(Me.Width,Me.Height) g = Graphics.FromImage(bmp) g.FillRectangle(New SolidBrush(Color.Red),New Rectangle(20,20,100,100)) End Sub Private Sub btnDraw_Click(sender As Object,e As EventArgs) Handles btnDraw.Click g.FillRectangle(New SolidBrush(Color.Green),New Rectangle(140,100)) g.FillRectangle(New SolidBrush(Color.Blue),New Rectangle(260,100)) End Sub Private Sub Form6_Paint(sender As Object,e As PaintEventArgs) Handles Me.Paint Dim g1 As Graphics = Me.CreateGraphics g1.DrawImage(bmp,New Point(0,0)) End Sub@H_404_0@Load时的红色正方形,按下按钮后的两个正方形,即使最小化也不怕消失了。 @H_404_0@
@H_404_0@由于.net平台下C#和vb.NET很相似,本文也可以为C#爱好者提供参考。 @H_404_0@学习更多vb.net知识,请参看 vb.net 教程 目录