How to do get system.drawing.graphics content into a picture box?

Posted on 2011-02-24
Medium Priority
Last Modified: 2012-05-11
I have created a functin that scales an image.

The scaling appears to go ok, but the problem is that I have no idea how to get the scaled graphic (gt_dest) back into the picturebox (picBannerBox) that is on Form1.

How do I do that?
Private Function ScaleImage(ByVal imgTemp As Image, ByVal box As PictureBox) As Graphics
        Dim fSize As String
        Dim iNewx As Integer = 0
        Dim iNewy As Integer = 0

        Dim oldBMP As New Bitmap(CInt(imgTemp.Width), CInt(imgTemp.Height))

        'Determine which side is larger than the canvas, 

        If ImageTooWide(imgTemp) And ImageTooTall(imgTemp) Then
            '...and if both are larger, pick the larger side.
            If imgTemp.Height > imgTemp.Width Then
                fSize = "height"
                fSize = "width"
            End If
            '... Other wise pick the one that is larger.
            If ImageTooWide(imgTemp) Then fSize = "width"
            If ImageTooTall(imgTemp) Then fSize = "height"
        End If

        Select Case fSize
            Case "width"
                iNewx = picBannerBox.Width
                iNewy = iNewx / imgTemp.Width * imgTemp.Height
            Case "height"
                iNewy = picBannerBox.Height
                iNewx = iNewy / imgTemp.Height * imgTemp.Width
        End Select
        Dim newBMP As New Bitmap(iNewx, iNewy)
        'Create a blank, new graphic that is the correct *new* size
        Dim gt_dest As Graphics = Graphics.FromImage(newBMP)
        'Draw our picture onto it, scaling it...
        gt_dest.DrawImage(imgTemp, 0, 0, iNewx + 1, iNewy + 1)
        'Draw new image to picBannerBox
    End Function

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Question by:DrDamnit
1 Comment
LVL 32

Accepted Solution

DrDamnit earned 0 total points
ID: 34974327
Figured it out:

Dim newBMP As New Bitmap(iNewx, iNewy)
        Dim newImage As Image
        newImage = CType(newBMP, Image)

        'Create a blank, new graphic that is the correct *new* size
        Dim gt_dest As Graphics = Graphics.FromImage(newImage)
        'Draw our picture onto it, scaling it...
        gt_dest.DrawImage(imgTemp, 0, 0, iNewx + 1, iNewy + 1)
        Return newImage

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