Drawing Control

hi there,

in Delphi, there is a control named TPaintBox which is similar to PictureBox but with a Canvas property that is very useful if we intend to do some drawing on it.

1. is there any control in C# like TPaintBox to draw something on it?

2. would you please write a simple code snippet in which a simple line is drawn on this control?

thanks for your time

You can use the:

Code:

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// Create a Graphics object for the Control.
  Graphics g = pictureBox.CreateGraphics();

---

to get the Graphics object for the PictureBox control. Then use the members of the Graphics class to draw on it.

thanks but how should i redraw the line?

it vanishes as soon as i scroll it or something covers it for a while!

EDIT:
ok,

i find a solution and it's using Bitmap instead.

so here is my code:

Code:

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            Bitmap bm = new Bitmap(picturebox.Width, picturebox.Height);
            Graphics g = Graphics.FromImage(bm);
            System.Drawing.Pen p = new System.Drawing.Pen(Color.Red);
           
            g.DrawLine(p, 0, 0, 10, 10);
            picturebox.Image = bm;
           
            p.Dispose();
            g.Dispose();

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but there's a problem. since i create PictureBoxes at runtime and i remove them by calling Controls.Clear(), when should i dispose this bitmap object?

In general, all drawing code should be placed in the forms Paint event handler. This is automatically called when part of your application needs to be drawn.