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| Title | Copy one picture onto a location in another in VB .NET |
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| Keywords | DrawImage, copy picture, PaintPicture, VB.NET |
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| Categories | Graphics, VB.NET |
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Make Bitmap objects representing the source and destination images. (Note that these Bitmap objects must be distinct.) Create a Graphics object attached to the destination Bitmap and use its DrawImage method to copy the picture.
This example then draws a rectangle around the copied picture. Notice how it uses a Rectangle object to define the rectangle and the destination for the copied image. Using the same Rectangle object ensures that the two match.
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' Copy the entire picture into part of the picture.
Private Sub btnGo_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles btnGo.Click
' Note that fr_bm and to_bm must be different.
Dim fr_bm As New Bitmap(picImage.Image)
Dim to_bm As New Bitmap(picImage.Image)
' Get a Graphics object for fr_bm.
Dim gr As Graphics = Graphics.FromImage(to_bm)
' Copy the image and a box around it.
Dim rect As New Rectangle( _
fr_bm.Width * 0.1, fr_bm.Height * 0.1, _
fr_bm.Width * 0.4, fr_bm.Height * 0.4)
gr.DrawImage(fr_bm, rect)
gr.DrawRectangle(Pens.Red, rect)
' Display the result.
picImage.Image = to_bm
End Sub
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