Visual C# Drawing is Beneath Everything

[str1ker]

Hi again,

This problem is a little more complicated, and once again is in C#. I've create a form, with a groupbox, and in it, a picturebox. In the picturebox's paint event, I've drawn a black line through the middle of the picturebox, but the line is behind the picturebox and groupbox.

How do I get the line to be drawn in front of everything? In Visual BASIC, doing the same thing works fine, but in C#, anything that is drawn, is behind all objects and controls...

Sincerely,

Str!ker

[weaknessforcats]

Moving this to the.NET forum.

[kenobewan]

What code are you using to draw the line?

[str1ker]

private void pictureBox2_Paint(object sender, PaintEventArgs e)
        {
            int idlePoint;
            idlePoint = this.trackBar1.Value;
 
            Point point1 = new Point(229, 210 - idlePoint);
            Point point2 = new Point(229, 210 - idlePoint);
 
            Graphics graphics;
            graphics = this.CreateGraphics();
            Pen pen = new Pen(Color.FromArgb(255, 0, 0, 0));
            graphics.DrawLine(pen, point1, point2);
        }

That's the code. I've done similar things in BASIC, and that works, but in C# it doesn't...

[str1ker]

anybody? this is really annoying for me.

[marmot4]

The problem is that you used this.CreateGrap hics() to obtain a graphics object. This gives you a graphics object at the level of the Form, so your line is appearing on the form.

You want your line to appear on the picturebox, so you shouldn't use this.CreateGrap hics(). Instead just use the graphics object that the event args provides you: e.Graphics;

Its always best when in a paint event or OnPaint override to use the provided Graphics object rather than creating your own.

Hope this helps,
Kevin