Trackball on selected series

[Josef]

I have a chartview with three line series representing measurement values and two more displaying the upper an lower limit of the values.Is it possible to show the trackball only on the three measurement series. 

[Dimitar]

Hi Josef,

You can use the TextNeeded event to change the default text. Here is an example that show how you can skip some series:

public RadForm1()
{
    InitializeComponent();
    var controler = new ChartTrackballController();
    controler.TextNeeded += Controler_TextNeeded;
    radChartView1.Controllers.Add(controler);
}

private void Controler_TextNeeded(object sender, TextNeededEventArgs e)
{
    StringBuilder sb = new StringBuilder();

    foreach (DataPointInfo point in e.Points)
    {
        if (point.Series == radChartView1.Series[0]  || point.Series == radChartView1.Series[1])
        {
            continue;

        }
        var dataPoint = point.DataPoint as CategoricalDataPoint;
        sb.AppendLine(point.Series.Name + " " + dataPoint.Value);

    }
    e.Text = sb.ToString();
}

If you are using straight lines for the limit series you can replace them with annotations: Grid line | UI for WinForms Documentation.

I hope this will be useful. Let me know if you have additional questions.

Regards,
Dimitar
Progress Telerik

[Josef]

 Hello Dimitar,

thanks for you immediate response. I think this meets my needs. Checking the grid line annotation I stumbled on the marked zone annotation. I think about using this to display different limit ranges. 

 

Regards,

Josef

[Dimitar]

Hi Josef,

Ok, let me know if you need further assistance.

Regards,
Dimitar
Progress Telerik