vb.netgdi+的简单介绍

vb.net GDI ,不是系统的字体,是工程目录下的字体文件

GDI绘图用字体必须安装才能使用

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在客户机部署应用程序时，安装该字体就行

vb.net GDI绘图刷新问题

绘图代码写在Paint事件中，如

Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint

Dim g As Graphics = Me.CreateGraphics

g.DrawLine(Pens.Red, 100, 100, 200, 100)

End Sub

'方法二：在 PictureBox1上显示图像----图画在Bitmap

PictureBox1.Image = Nothing

Dim wid As Integer = PictureBox1.ClientSize.Width

Dim hgt As Integer = PictureBox1.ClientSize.Height

Dim bm As New Bitmap(wid, hgt)

Dim g As Graphics = Graphics.FromImage(bm)

'画图代码

'画图代码

PictureBox1.Image = bm

PictureBox1.Refresh()

g.Dispose()

基于VBNET的GDI坐标系统如何设置坐标单位

123456789101112Dim picX, picY, x1, y1, x2, y2, a href=";tn=44039180_cprfenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1YLPhmknAcvPjNhnvRYPAF90ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3EnHb3rjbkrjc3rHc4nHn1rj0vPs" target="_blank" class="baidu-highlight"gdi/aX, a href=";tn=44039180_cprfenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1YLPhmknAcvPjNhnvRYPAF90ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3EnHb3rjbkrjc3rHc4nHn1rj0vPs" target="_blank" class="baidu-highlight"gdi/aYpicX = 0 '要转换的Picture1坐标XpicY = 0 '要转换的Picture1坐标Yx1 = Picture1.ScaleLefty1 = Picture1.ScaleTopx2 = Picture1.ScaleLeft + Picture1.ScaleWidthy2 = Picture1.ScaleTop + Picture1.ScaleHeight '记录原先的坐标系统Picture1.ScaleMode = 3 '坐标系统设为像素a href=";tn=44039180_cprfenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1YLPhmknAcvPjNhnvRYPAF90ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3EnHb3rjbkrjc3rHc4nHn1rj0vPs" target="_blank" class="baidu-highlight"gdi/aX = Round((picX - x1) / (x2 - x1) * Picture1.ScaleWidth)gdiY = Round((picY - y1) / (y2 - y1) * Picture1.ScaleHeight)MsgBox "Picture1的坐标(" picX "," picY ")转为GDI坐标是(" gdiX "," gdiY ")"Picture1.Scale (x1, y1)-(x2, y2) '改回原先的坐标系统

vb.net中使用GDI画图，然后平移，可是平移之前的图还在，怎么去掉平移之前的，保留平移之后的？

如果是简单的移动，先把图形绘制到大小和PictureBox的Bitmap上，然后再绘制到PictureBox就行。

不过在VB.NET中用GDI绘制最好用BufferedGraphics图形缓冲区，速度马马虎虎（VB就这样了），但是不闪烁，不存在背景擦除的问题。