C# Drawing on Panels

Question

I\'m drawing up a day schedule and representing timeslots with panels, and appointments are yet more panels on top.

The user is able to scroll up and down so that th

Answer 1

You need to call this method from the paint event handler, not just whenever you like. So in your constructor you might have:

panel1.Paint += new PaintEventHandler(panel1_Paint);

and then the implementation:

    private void panel1_Paint( object sender, PaintEventArgs e )
    {
        var p = sender as Panel;
        var g = e.Graphics;

        g.FillRectangle( new SolidBrush( Color.FromArgb( 0, Color.Black ) ), p.DisplayRectangle );

        Point[] points = new Point[4];

        points[0] = new Point( 0, 0 );
        points[1] = new Point( 0, p.Height );
        points[2] = new Point( p.Width, p.Height);
        points[3] = new Point( p.Width, 0 );

        Brush brush = new SolidBrush( Color.DarkGreen );

        g.FillPolygon( brush, points );
    }

Answer 2

For example we have this drawing event which is drawing a text from textBox1:

private void panel1_draw(object sender, PaintEventArgs e)
    {
        var g = e.Graphics;
        Pen myp = new Pen(System.Drawing.Color.Red, 4);
        Font fy = new Font("Helvetica", 10, FontStyle.Bold);
        Brush br = new SolidBrush(System.Drawing.Color.Red);
        g.DrawString(textBox1.Text, fy, br, 0,0);
    }

In order to draw on your panel1, you need to write this code in your button event handler:

private void button1_Click(object sender, EventArgs e)
    {
        panel1.Paint+=new PaintEventHandler(panel1_draw);
        panel1.Refresh();
    }

The first line draws the text in your panel and if you want the text to appear you must refresh the panel. The main thing is in using the panel1.Pain += new PaintEventHandler(your void name); and panel1.Refresh();