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ScatterLineSeries Point Labels
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This is a migrated thread and some comments may be shown as answers.
Adam
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Adam asked on 24 Jul 2019, 05:28 PM

Hello,

Is it possible to add labels to points in a ScatterLineSeries? I've been able to add labels to CategoricalDataPoints but not ScatterDataPoints. I noticed that on https://docs.telerik.com/devtools/winforms/controls/chartview/series-types/series-types there are labels for Line, Spline, Area, and SplineArea series, but not for Bar or Scatter.

I added a custom LabelFormatting event that gets called when I use a LineSeries with CategoricalDataPoints, but it doesn't run when I use a ScatterLineSeries with ScatterDataPoints. Here's some sample code I tested (in OpenEdge) and a screenshot of my results:

LabelFormatting method:

METHOD PRIVATE VOID myLabelFormatting(INPUT sender AS System.Object, INPUT e AS ChartViewLabelFormattingEventArgs):
   e:LabelElement:BackColor = System.Drawing.Color:White.
   e:LabelElement:ForeColor = System.Drawing.Color:Black.
   e:LabelElement:BorderColor = System.Drawing.Color:Black.
   e:LabelElement:Font = NEW Font("Segoe Script", 12, FontStyle:Regular).
   DEFINE VARIABLE element AS CartesianLinePointElement NO-UNDO.
   MESSAGE "Casting element..." VIEW-AS ALERT-BOX.
   element = CAST(e:LabelElement:Parent, CartesianLinePointElement).
    
   DEFINE VARIABLE dataPoint AS ScatterDataPoint NO-UNDO.
   MESSAGE "Casting point..." VIEW-AS ALERT-BOX.
   dataPoint = CAST(element:DataPoint, ScatterDataPoint).
    
   e:LabelElement:Text = STRING(dataPoint:XValue) + ", " + STRING(dataPoint:YValue).
END METHOD.

 

Sample code:

THIS-OBJECT:radChartView1:LabelFormatting:Subscribe(myLabelFormatting).       
 
DEFINE VARIABLE lineSeries AS ScatterLineSeries NO-UNDO.
lineSeries = NEW ScatterLineSeries().
lineSeries:DataPoints:Add(NEW ScatterDataPoint(1, 10)).
lineSeries:DataPoints:Add(NEW ScatterDataPoint(15, 15)).
lineSeries:DataPoints:Add(NEW ScatterDataPoint(5, 20)).
lineSeries:PointSize = NEW SizeF(8, 8).
lineSeries:ShowLabels = TRUE.
radChartView1:Series:Add(lineSeries).
 
radChartView1:BackColor = System.Drawing.Color:LightGray.
radChartView1:ShowLegend = TRUE.

 

Thanks,

Adam

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Dess | Tech Support Engineer, Sr.
Telerik team
answered on 25 Jul 2019, 08:30 AM
Hello, Adam,   

In order to show labels for the ScatterLineSeries, make sure that you set the Label for each ScatterDataPoint. Please refer to the following code snippet:

public RadForm1()
{
    InitializeComponent();
    this.radChartView1.LabelFormatting += radChartView1_LabelFormatting;
 
    ScatterLineSeries scatterSeries = new ScatterLineSeries();
    scatterSeries.DataPoints.Add(new ScatterDataPoint(15, 19) { Label = "15, 19" });
    scatterSeries.DataPoints.Add(new ScatterDataPoint(18, 10) { Label = "18, 10" });
    scatterSeries.DataPoints.Add(new ScatterDataPoint(13, 15) { Label = "13, 15" });
    scatterSeries.DataPoints.Add(new ScatterDataPoint(10, 8) { Label = "10, 8" });
    scatterSeries.DataPoints.Add(new ScatterDataPoint(5, 2) { Label = "5, 2" });
    scatterSeries.PointSize = new SizeF(8, 8);
    scatterSeries.ShowLabels = true;
    this.radChartView1.Series.Add(scatterSeries);
}
 
private void radChartView1_LabelFormatting(object sender, ChartViewLabelFormattingEventArgs e)
{
    e.LabelElement.ForeColor = Color.Red;
}



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I hope this information helps.

Regards,
Dess | Tech Support Engineer, Sr.
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Adam
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answered on 25 Jul 2019, 05:16 PM
Thank you! Setting the label for each point fixed my issue.
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Adam
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Dess | Tech Support Engineer, Sr.
Telerik team
Adam
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