how to draw a crosshair in a panel in windows forms

[Miguel Mariz]

I have a 2 split containers on my C# .NET form dividing the form into 3 panels:

splitContainer1_Panel1
splitContainer2_Panel1
splitContainer1_Panel2

I want to be able to draw 2 lines - 1 vertical and 1 horizontal in this panel - making a crosshair.

I have tried using a new cursor like this:

private void splitContainer2_Panel1_MouseMove(object sender, MouseEventArgs e)
        {
            textBoxCoordenadas.Text = ("X = " + e.X.ToString() + "m ; Y = " + e.Y.ToString() + "m");
 
            if (CrossHaircheckBox1.Checked == true)
            {
                splitContainer3.Panel1.Cursor = crossCursor(e);
            }
            else
            {
                splitContainer3.Panel1.Cursor = Cursors.Arrow;
            }
 
Thw function that defines the cursor is the following:
 
        private Cursor crossCursor(MouseEventArgs e)
        {
            //buscar a posição do cursor
            //Panel panel = new System.Windows.Forms.Panel();
            //Point point = panel.PointToClient(Cursor.Position);
            //vai buscar o tamanho da picturebox
            int[] tamanho =             
            int x = splitContainer1.Panel1.ClientSize.Height;
            int y = splitContainer1.Panel1.ClientSize.Height
            //inicio da caneta tipo com a cor preta
            Pen pen = new Pen(Color.Black);
 
            //Inicia a box de desenho
            var pic = new Bitmap(x, y);
            Graphics gr = Graphics.FromImage(pic);
            //Desenha o crosshair (linhas principais)
            var pathX = new GraphicsPath();
            var pathY = new GraphicsPath();
            pathX.AddLine(0, y / 2, x, y / 2);
            pathY.AddLine(x / 2, 0, x / 2, y);
            gr.DrawPath(pen, pathX);
            gr.DrawPath(pen, pathY);
            //Desenha o crosshair (quadrado central)
            int tc = 5;//tamanho do crosshair
            var pathX2 = new GraphicsPath();
            pathX2.AddLine(x / 2 - tc, y / 2 + tc, x / 2 + tc, y / 2 + tc);
            pathX2.AddLine(x / 2 + tc, y / 2 + tc, x / 2 + tc, y / 2 - tc);
            pathX2.AddLine(x / 2 + tc, y / 2 - tc, x / 2 - tc, y / 2 - tc);
            pathX2.AddLine(x / 2 - tc, y / 2 - tc, x / 2 - tc, y / 2 + tc);
            gr.DrawPath(pen, pathX2);
            //aplica o bitmap e cria a imagem (pointer)
            IntPtr ptr = pic.GetHicon();
            var c = new Cursor(ptr);
            return c;
        }

I have 2 problems in my aproach;

1 - The cursor doesnt update the lines so that when i move my mouse the lines dont end at the panel limits;
2 - The cursos removes performance. The way i mesure this is by printing the mouse coord to a textbox and i can see it's very slow.

Thoughts anyone?

[Miguel Mariz]

Already solved the problema :)