Pre loader

Tooltip and series selection become out of sync

Welcome to the SciChart Forums!

  • Please read our Question Asking Guidelines for how to format a good question
  • Some reputation is required to post answers. Get up-voted to avoid the spam filter!
  • We welcome community answers and upvotes. Every Q&A improves SciChart for everyone

WPF Forums | JavaScript Forums | Android Forums | iOS Forums


The issue I am running into is that when we hover over the plot, the tooltip does not represent the series that eventually becomes flagged as selected. This occurs when there are several line series grouped closely together.

I am using the default tooltip modifier together with a custom selection modifier.

I was wondering whether there is a way to obtain the tooltip information in our OnModifierMouseDown or somehow reconcile the hit testing of the tooltip modifier and our custom selection modifier (logic below). Our hit test radius is 9 because this seemed to be closest to the default tooltip hittest radius.

(Note our CustomSeriesSelectionModifier overrides ChartModifierBase. It does not override the default seriesselectionmodifier class because we found that it was not giving us adequate control over the selection rules)

Example scenario: Three curves grouped closely together. Hovering over them shows the tooltip for curve 3. Clicking selects curve 1 (even while the tooltip for curve 3 is still visible)

Thanks in advance

public class CustomSeriesSelectionModifier : ChartModifierBase
    public CustomSeriesSelectionModifier()
    : base()
        ReceiveHandledEvents = true;

    public override void OnModifierMouseDown( ModifierMouseArgs e )
        base.OnModifierMouseDown( e );

        var point = GetPointRelativeTo( e.MousePoint, ModifierSurface );

        Vector smallestDifference = new Vector( double.MaxValue, double.MaxValue );
        IRenderableSeries hitSeries = null;

        foreach ( var series in this.ParentSurface.RenderableSeries )
            var hitTest = series.HitTest( point, 9.0 );
            if ( hitTest.IsHit )
                Vector diff = Point.Subtract( point, hitTest.HitTestPoint );

                if ( smallestDifference.Length > diff.Length )
                    smallestDifference =  diff ;
                    hitSeries = series;

        if ( hitSeries != null )
            // do custom selection stuff

  • You must to post comments
Showing 0 results
Your Answer

Please first to submit.

Try SciChart Today

Start a trial and discover why we are the choice
of demanding developers worldwide

Start TrialCase Studies