When used in conjunction with the RolloverModifier, each series displays a RolloverMarker, which tracks the currently highlighted data-point as the user-moves the mouse. The RolloverModifier is the subject of its individual tutorial, but for the sake of this topic, we only show how to set a RolloverMarkerTemplate on a series:

<SciChart:FastLineRenderableSeries x:Name=”rSeries0” Stroke="DarkSlateGray">
   <SciChart:FastLineRenderableSeries.RolloverMarkerTemplate>
      <!-- Define a control template for the first series rollover marker -->
      <!-- Internally, this will be used to template a blank control which will be overlaid on -->
      <!-- the ChartModifierSurface (canvas) which exists over the SciChartSurface -->
      <ControlTemplate x:Key="FirstSeriesRolloverTemplate">
          <Ellipse Fill="#77FFFFFF" Stroke="#FF708090" Width="11" Height="11" StrokeThickness="2"/>
      </ControlTemplate>
   </SciChart:FastLineRenderableSeries.RolloverMarkerTempalte>
</ SciChart:FastLineRenderableSeries>

This defines the appearance you will see when hovering the mouse over a data-point and using the RolloverModifier. For instance, the Ellipse template above creates something like this:

Further Reading

Complete RolloverModifier example can be found in SciChart Examples Suite at Tooltips and HitTest -> Using RolloverModifier Tooltips. The full source code can be found online at this link.

To learn more about RolloverModifier API, please find a relevant documentation article at this link.