Hi,

I am just wondering if it is possible to add previous(in date time value) points to a real time graph without redrawing the whole graph. I send through data via network, so it is possible to have data which is arrives later but I still would like to add that point to the graph.

Regards
Daniel

Hi Daniel,

Yes - you simply need to find to index at which to place the value - for example:

      private void Form1_Load(object sender, EventArgs e)
      {
         NChart chart = nChartControl1.Charts[0];
         chart.BoundsMode = BoundsMode.Stretch;

         NLineSeries line = new NLineSeries();
         line.UseXValues = true;
         chart.Series.Add(line);

         AddDataPoint(line, 1, 1);
         AddDataPoint(line, 3, 3);
         AddDataPoint(line, 2, 2);
      }

      private void AddDataPoint(NLineSeries line, double x, double y)
      {
         int i;

         for (i = line.XValues.Count - 1; i > 0; i--)
         {
            if ((double)line.XValues[i] < x)
            {
               break;
            }
         }

         if (i < 0)
         {
            i = 0;
         }
         line.XValues.Insert(i, x);
         line.Values.Insert(i, y);
      }

Hope this helps...

Best Regards,
Nevron Support Team

Hi,

Thank you for the fast reply. I changed the code a bit to suit for my application but after trying unfortunately it does not work as I think it should. I changed to code to this:

public void AddDataPoint(int graphNumber, double graphValue, DateTime time)
{
NChart chart = nChartControl1.Charts[0];
NXYScatterSeries series = (NXYScatterSeries)chart.Series[graphNumber];

int i = series.XValues.Count-1;

while (i > 0 && DateTime.FromOADate((double)series.XValues[i]) > time)
{
i--;
}

if (i < 0)
{
i = 0;
}

series.XValues.Insert(i, time);
series.Values.Insert(i, graphValue);
}
It is basically the same.

Please find attached the example picture which I have made while I was testing the solution.

In the firs picture I show the graph which I generated at start up.
In the second picture I add some points in random time between the set time range.

Regards
Daniel