Chart with horizontal scrolling c#

Question

Good morning guys, I’m drawing a line chart on a pictureBox with "drawline"s concatenated.

Basically what I want is to create a horizontal scroll bar to navigate the chart, that is, to be able to scroll through the chart horizontally using the scroll bar. Follows code drawing graph.

    void DrawANALISE()
    {
        Graphics g = pcbANALISE.CreateGraphics();
        g.SmoothingMode = SmoothingMode.AntiAlias;

        var lastPoint1 = new PointF(0F, (float)(2 * Height / 5) * 0.5F);
        PointF newPoint1 = new PointF();

        for (int i = 0; i < 6000; i++)
        {
            //aquisicaodata é uma lista onde há 6000 valores para y
            var porcent = aquisicaodata[i] / 5;
            newPoint1.X = (i + 1) * 0.2f;

            if (porcent > 1) porcent = 1;
            var hg = porcent * (2 * pcbANALISE.Height / 5);

            if (porcent >= 1) newPoint1.Y = 2 * pcbANALISE.Height / 5 - hg;
            else newPoint1.Y = 2 * pcbANALISE.Height / 5 - hg - 1;

            using (var p = new Pen(Color.Lime, 0.1f)) g.DrawLine(p, lastPoint1, newPoint1);

            lastPoint1 = newPoint1;
        }
    }

Since in the code I am drawing 1 point every 0.2 pixels horizontally and there are a total of 6000 points, which would result in a total of 1200 pixels horizontally to draw whole graph, a pcb of 500 pixels wide is not enough to display whole graph. That is why I would like to create a horizontal scroll bar so that I can have a view of the entire chart. I will edit if necessary. If anyone can help, I’d really appreciate it!

Answer 1

Just create a control variable for the scrollbar camera:

int camera = 0;

This part would look like this:

for (int i = camera; i < (camera + (pictureBox.Width / 0.2)); i++)

and in the scrollbar event:

hscrollBar_scroll(EventArgs e, object sender)
{
    camera = hScrollBar.Value * 6000 / 100;
    DrawANALISE();//esqueci de por para redesenhar o gráfico.
}

If I can’t help you with that, I can do a full control, if you prefer.