How to mark part of the image that appear on my application ?

[Lost User]

Hi, I'm using picturebox to show some images that my application hold. I want to mark with some square part of my image ( mark in the code ). How can i do it ? Thanks. P.S I'm using simple winform (not WPF)

[Ravi Bhavnani]

You'll need to create a watermarked version of the Image before setting it into the PictureBox control. /ravi

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[ignrod]

Maybe you want something like the following:

Graphics g = Graphics.FromImage(pb.Image); // Assume pb is your PictureBox
g.DrawRectangle(Pens.Red, pbleft, pbtop, pbwidth, pbheight); // Draw red rectangle in your image.
g.Dispose();

This will draw a red rectangle in your image. Is that what you want?

[Luc Pattyn]

I don't think the PictureBox will even be aware you did that. You would have to reload the image or otherwise signal it about the change. BTW: I think PictureBoxes are crap anyway, one should not even try and do such complex :-D things to them. :)

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Please use <PRE> tags for code snippets, they preserve indentation, and improve readability.

[ignrod]

That's probably true. In that case

Image im = pb.Image; // Assume pb is your PictureBox
Graphics g = Graphics.FromImage(im);
g.DrawRectangle(Pens.Red, pbleft, pbtop, pbwidth, pbheight); // Draw red rectangle in your image.
g.Dispose();
pb.Image = im;