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How to get current Y value of annotation in code behind?

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Version
4.1.1.8645
WPF Annotation
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Thanks for the additional info! OK so you want to get the Intercept of the VerticalLineAnnotation with a series, is that right?

In that case you need to use our Hit-Test API.

Some code like this should do it:

        // Starting with the X value of the VerticalLineAnnotaiton
        double x1 = verticalLineAnnotation.X1;
        // Perform a VerticalSliceHitTest on the series. Also see .HitTest() method for X,Y hit-tests whereas VerticalSliceHitTest considers X
        HitTestInfo hitTestResult = renderableLineSeries.VerticalSliceHitTest(new Point(x1, 0));
        // Now you have the X,Y value of the series at the hit test site
        double xValueAtHit = (double)hitTestResult.XValue;
        double yValueAtHit = (double)hitTestResult.YValue;
        // And the screen coord
        Point xyCoordAtHit = hitTestResult.HitTestPoint;

Best regards,
Andrew

  • Roland D
    Is it possible to use this with VerticalLineAnnotationViewModel? If I pass in my X1 position from a custom class based on VerticalLineAnnotationViewModel the VerticalSliceHitTest detects no hit at all. The solution below is not suitable for me because I’m working on unsorted data so ‘SearchMode.Nearest’ won’t work for FindIndex().
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I found solution:

 var dataseries = this.ParentSurface.RenderableSeries[0].DataSeries;
        var index = dataseries.FindIndex(MainAnnotation.X1, SciChart.Charting.Common.Extensions.SearchMode.Nearest);
        var yValue = (IComparable)this.ParentSurface.RenderableSeries[0].DataSeries.YValues[index];
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