vb how to wipe a piece of image and replace with trasparency

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I want to wipe a piece of image and replace it with trasparency

I did this:

VB

Dim aw As UInteger = com.tilesizewidth
        Dim ah As UInteger = com.tilesizeheight
        If multisel Then
            aw = Abs(pnt2.X - pnt.X)
            ah = Abs(pnt2.X - pnt.X)
            multisel = False
            drawselrect = False
            selectedfirstpnt = True
        End If

        'Dim cloneimg = sourceimg.Clone()
        Using g As Graphics = Graphics.FromImage(sourceimg)
            'g.DrawRectangle(New Pen(New TextureBrush(cloneimg)), pnt.X, pnt.Y, aw, ah)
            g.FillRegion(Brushes.Trasparent, New Region(New Rectangle(pnt.X, pnt.Y, aw, ah)))
            'g.FillRegion(Brushes.White, New Region(New Rectangle(pnt.X, pnt.Y, aw, ah)))
        End Using

        imgsaved = False
        pic.Invalidate()

g.FillRegion(Brushes.Trasparent, New Region(New Rectangle(pnt.X, pnt.Y, aw, ah))) don't work

g.FillRegion(Brushes.White, New Region(New Rectangle(pnt.X, pnt.Y, aw, ah))) works but it's white!!

Posted 26-Apr-14 23:20pm

Raffa505

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Raffa505 · Answer 1 · 2014-04-26T23:57:00

this is my ugly solution for now!

VB

Dim aw As UInteger = com.tilesizewidth + pnt.X
        Dim ah As UInteger = com.tilesizeheight + pnt.Y
        If multisel Then
            aw = pnt2.X
            ah = pnt2.Y
            multisel = False
            drawselrect = False
            selectedfirstpnt = True
        End If

        Dim edit = New Bitmap(sourceimg)
        For i As Integer = pnt.X To aw
            For j As Integer = pnt.Y To ah
                edit.SetPixel(i, j, Color.Transparent)
            Next
        Next

        sourceimg = edit