PictureBox Painting

[jimwawar]

I am working in C# and have a windows form containing a picturebox. The picture box is loaded with a bitmap by the user. The bitmaps are larger then the window and require scrolling. There is an option to overlay a grid on the bitmap. If the grid has been selected it appears over the image. If the scroll bar buttons are used to view the rest of the image the grid remains visible. If the mouse is clicked in the scroll bar to move to a different part of the image, the grid appears for a split second before being replaced by the image. If the scroll bar buttons are now used the grid reappears. I have been using the event paint in picturebox to draw/redraw the grid. I don't want to add the grid to the image. The code for I am using for the paint event is:

        private void pictureBox_Paint(object sender, PaintEventArgs e)
        {
                if (grid)
                {
                    griddraw();
                }
        }
 

Where grid is a bool to show if the user wants the grid on and griddraw is a function which draws the grid over the image. In griddraw I am using Graphics and CreateGraphic.

Any help would be appericated.
Jim

[jimwawar]

It seems I have solved my problem. DO NOT use the PictureBox controls to work the image. Use PaintEventArgs and pass the event to the method. My PictureBox paint event now looks like

        private void pictureBox_Paint(object sender, PaintEventArgs e)
        {
                if (grid)
                {
                    griddraw(e);
                }
        }
 

Also if you are working with graphics I would recommend the following site
http://www.bobpowell.n et/faqmain.htm

I am working in C# and have a windows form containing a picturebox. The picture box is loaded with a bitmap by the user. The bitmaps are larger then the window and require scrolling. There is an option to overlay a grid on the bitmap. If the grid has been selected it appears over the image. If the scroll bar buttons are used to view the rest of the image the grid remains visible. If the mouse is clicked in the scroll bar to move to a different part of the image, the grid appears for a split second before being replaced by the image. If the scroll bar buttons are now used the grid reappears. I have been using the event paint in picturebox to draw/redraw the grid. I don't want to add the grid to the image. The code for I am using for the paint event is:

        private void pictureBox_Paint(object sender, PaintEventArgs e)
        {
                if (grid)
                {
                    griddraw();
                }
        }
 

Where grid is a bool to show if the user wants the grid on and griddraw is a function which draws the grid over the image. In griddraw I am using Graphics and CreateGraphic.

Any help would be appericated.
Jim