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I am trying to add a “LineArrowAnnotation” using a composite annotation.
When I run my code (see below) I get an exception (also below).
When I put “AnnotationCoordinateMode” in AnnotationCoordinateMode.Absolute,
it will show the LineArrowAnnotation, but on the wrong place.

When I run my code I get the following exception:

‘NaN’ is not a valid value for property ‘Y1’.

And this is the stack trace:

   at System.Windows.DependencyObject.SetValueCommon(DependencyProperty dp, Object value, PropertyMetadata metadata, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType, Boolean isInternal)
   at System.Windows.DependencyObject.SetValue(DependencyProperty dp, Object value)
   at SciChart.Charting.Visuals.Annotations.LineArrowAnnotation.c4fae01a1bd9d8777f0acbea006c37ddd(AnnotationCoordinates cb7eea21dddaf59b654790a03f7fecf82, LineArrowAnnotation c7816e538855bcbae71ae0f6efa624460)
   at SciChart.Charting.Visuals.Annotations.LineArrowAnnotation.ca698bc0a82170c849e74a3955c194cda.PlaceAnnotation(AnnotationCoordinates coordinates)
   at SciChart.Charting.Visuals.Annotations.AnnotationBase.PlaceAnnotation(AnnotationCoordinates coordinates)
   at SciChart.Charting.Visuals.Annotations.AnnotationBase.MakeVisible(AnnotationCoordinates coordinates)
   at SciChart.Charting.Visuals.Annotations.AnnotationBase.Update(ICoordinateCalculator`1 xCoordinateCalculator, ICoordinateCalculator`1 yCoordinateCalculator)
   at SciChart.Charting.Visuals.Annotations.CompositeAnnotation.Update(ICoordinateCalculator`1 xCoordinateCalculator, ICoordinateCalculator`1 yCoordinateCalculator)
   at SciChart.Charting.Visuals.Annotations.AnnotationBase.TryUpdate(ICoordinateCalculator`1 xCalc, ICoordinateCalculator`1 yCalc)
   at SciChart.Charting.Visuals.Annotations.AnnotationBase.Refresh()
   at SciChart.Charting.Visuals.Annotations.AnnotationBase.ccc682ea04b7d185ec619d8e3262c6d9b()
   at SciChart.Charting.Visuals.Annotations.AnnotationBase.OnAnnotationLoaded(Object sender, RoutedEventArgs e)
   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   at System.Windows.UIElement.RaiseEvent(RoutedEventArgs e)
   at System.Windows.BroadcastEventHelper.BroadcastEvent(DependencyObject root, RoutedEvent routedEvent)
   at System.Windows.BroadcastEventHelper.BroadcastLoadedEvent(Object root)
   at MS.Internal.LoadedOrUnloadedOperation.DoWork()
   at System.Windows.Media.MediaContext.FireLoadedPendingCallbacks()
   at System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks()
   at System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget)
   at System.Windows.Media.MediaContext.RenderMessageHandler(Object resizedCompositionTarget)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

This is the code I use to draw the “LineArrowAnnotation”:

var line = new LineArrowAnnotation
{
     X1 = (double)annotation.MeasureFrom,
     X2 = (double)annotation.MeasureTo,
     Y1 = 0.9d,
     Y2 = 0.9d,
     Padding = new Thickness(0, 20, 0, 20),
     HeadLength = 4,
     HeadWidth = 6,
     //ToolTip = annotation.Tooltip,
     SnapsToDevicePixels = true,
     //CoordinateMode = AnnotationCoordinateMode.Absolute,
     CoordinateMode = AnnotationCoordinateMode.RelativeY,
     Stroke = new SolidColorBrush(color),
     StrokeDashArray = new DoubleCollection { 2, 2 },
     Tag = annotation,
};
Annotations.Add(line);
Version
4.2.3.9956
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Great Answer
1
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Found the solution, it gives the exception because the composite annotation itself doesn’t know what his Y1 or Y2 is.

So you need to add the following line:

Y1 = 0.9f;
Y2 = 0.9f;
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