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Labeling a few points in line chart

Hi there,

I'm working on an application that uses SfChart line chart to display live data (updated a few times per second). This is the same application I talked about in my 2 previous posts. The chart data contains a few thousand points. On each refresh, I want to add labels to a few points (max 20 points) selected in the ViewModel. I want to mark points with some marker, it can be a circle and write it's X and Y next to it. Also I want these labels not to overlap.

I tried adding a trackball to each selected point, but the trackballs disappeared after the chart update and it looked bad. I could use annotations but I'd have to add 2 annotations for each point (shape annotation to mark a point and text with X-Y info).

I saw that SfChart offers the ability to show labels for each point of the chart. Is there a way to show them only for selected points? Or is there another way to mark some points?

1 Reply

SS Sowndharya Selladurai Syncfusion Team April 24, 2023 01:46 PM UTC

Hi Piotr,

I have attached a sample for reference that demonstrates how to use the DataMarkerLabelCreated event to mark specific points using the MarkerType and MarkerColor properties in SfChart.

Chart, line chart

Description automatically generated


I hope this helps. Let me know if you need further assistance.



Attachment: LabelCustomization_d98eac63.zip

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