You could grab the image, manipulate it using GDI+, and set the Image property to the new image.
Bob
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Question
C# - GDI+ drawing a line inside a PictureBox
Hi guys 'n gals,
How would I go about creating a PictureBox (100 x 100), which has a white background and a red line, going at a 45 degree angle from the bottom left to the upper right of the PictureBox? I know this most likely requires the DrawLine() function, but I have no idea to how make that save the line as part of the PictureBox's Image.
Any thoughts?
Cheers!
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Answers
The following will draw the line on an image that is assigned to the picturebox. You can omit the code that dynamically creates the PictureBox if you already have it added to the page.
-----------------------
Bitmap img = new Bitmap(100, 100);
System.Drawing.Graphics g = Graphics.FromImage(img);
Pen drawingPen = new Pen(Color.Red, 1);
g.DrawLine(drawingPen, 0, 100, 100, 0);
PictureBox pbox = new PictureBox();
pbox.Top = 10;
pbox.Left = 10;
pbox.Width = 100;
pbox.Height = 100;
pbox.BackColor = Color.White;
pbox.Image = img;
this.Controls.Add(pbox);
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by: CBeach1980Posted on 2007-04-11 at 14:53:00ID: 18893786
Drawing on top of a picturebox will not cause it to keep the line. If the picturebox refreshes you will lose the added line. You can draw on the image itself and then assign it to the picturebox though.