SignalXY: Index was outside the bounds of the array #3926
Description
It can be reproduced when there is only one value in the plot and you select a rectangle with the middle mouse button.
5.0.34
SignalXY Plot with 4 signals and an additional right hand side y-axis and a DateTime x-Axis
Index was outside the bounds of the array.
at ScottPlot.DataSources.SignalXYSourceDoubleArray.GetFirstPointX(IAxes axes)
at ScottPlot.DataSources.SignalXYSourceDoubleArray.GetPixelsToDrawHorizontally(RenderPack rp, IAxes axes)
at ScottPlot.Plottables.SignalXY.Render(RenderPack rp)
at ScottPlot.Rendering.RenderActions.RenderPlottables.Render(RenderPack rp)
at ScottPlot.Rendering.RenderManager.Render(SKCanvas canvas, PixelRect rect)
at ScottPlot.Plot.Render(SKCanvas canvas, PixelRect rect)
at SkiaSharp.Views.WPF.SKElement.OnRender(DrawingContext drawingContext)
at System.Windows.UIElement.Arrange(Rect finalRect)
at System.Windows.ContextLayoutManager.UpdateLayout()
at System.Windows.ContextLayoutManager.UpdateLayoutCallback(Object arg)
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)
It can be reproduced when there is only one value in the plot and you select a rectangle with the middle mouse button.
It might be solved by changing SignalXYSourceDoubleArray.cs in line 243 from firstPointPosition to firstIndex (see below).
/// <summary>
/// If data is off to the screen to the left,
/// returns information about the closest point off the screen
/// </summary>
private (Pixel[] pointsBefore, int firstIndex) GetFirstPointX(IAxes axes)
{
var (firstPointPosition, firstPointIndex) = SearchIndex(axes.XAxis.Range.Span > 0 ? axes.XAxis.Min : axes.XAxis.Max); // if axis is reversed first index will on the right limit of the plot
if (firstPointIndex > MinimumIndex)
{
float beforeX = axes.GetPixelX(Xs[firstPointIndex - 1] + XOffset);
float beforeY = axes.GetPixelY(Ys[firstPointIndex - 1] * YScale + YOffset);
Pixel beforePoint = new(beforeX, beforeY);
return ([beforePoint], firstPointIndex);
}
else
{
return ([], MinimumIndex);
}
}