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Drawing on form

 
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Drawing on form, Bad Idea
s_jsstevens
12 Dec, 2007 - 11:43 AM
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I was writing a small program, and I just ran into a stupid problem. I had drawn my image on the form so whenever I resized my form, it would destroy part of the image. How can I get around this problem?
CODE

    If load_flag = False Then
            Do While runcount > 0
                myBitmap = get_image(myBitmap, ctr1)

                drawX = myarray(ctr1, 4) * 24
                drawY = myarray(ctr1, 5) * 24

                myGraphics = Graphics.FromHwnd(ActiveForm().Handle)

                Try
                    myGraphics.DrawImage(myBitmap, drawY, drawX, 25, 25)
                Catch ex As Exception
                    MessageBox.Show("Error loading file" & runcount)
                End Try

                runcount -= 1
                ctr1 += 1
            Loop
            load_flag = True
        End If



Thank you in advnace

This post has been edited by s_jsstevens: 12 Dec, 2007 - 11:44 AM
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baavgai
RE: Drawing On Form
12 Dec, 2007 - 11:59 AM
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Put your code in the Paint event on the form:
CODE

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


As an extra added bonus, the PaintEventArgs have the Graphics handle you're using already there. Paint should be called everytime the form need to be redrawn. There are some nuances to this, where you can figure out just what needs to be repainted, but for the most part you can just do the whole thing.

Note, for extra speed, hang on to that bitmap and just flash that to the screen. If the image is static, consider just putting it in a picturebox control and letting vb do the work for you.

Hope this helps.
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s_jsstevens
RE: Drawing On Form
12 Dec, 2007 - 01:22 PM
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Thank you, but that isnt exactly what I needed. Is there any way I can instead of drawing to the form. I can draw it into the forms background image?
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Jayman
RE: Drawing On Form
12 Dec, 2007 - 01:37 PM
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You could simply set the BackgroundImage property of the Form to the image you want and then set the BackgroundImageLayout to Stretch. This will cause the form to redraw the image for you to fit the size of the form.

This will come at a cost, though. You will see a flickering effect as the form is resized and the image will be stretched out of proportion to match the form size.

You could minimize the flickering problem by drawing the image on the form yourself, as you are currently doing, but only draw on the form from inside the ResizeEnd event of the form. This event is raised after the user has completed resizing the form.
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