Maintaining User Legend Selections

Hi Nicholas,

Thank you for contacting us.
I’m going to discuss your inquiry with our team, and we’ll get back to you as soon as we have an update.

However, to provide you with a proper solution, we would need to see how exactly you update the RenderableSeries. Could you please share the corresponding code sample?

Please also note that the code samples mentioned in your post were not attached/displayed.
To ensure that the code is displayed correctly, we recommend marking it as a corresponding content type by selecting the code lines and pressing the “Code sample” button on the toolbar when you create a forum post.
Please see the attached image for reference.

Kind regards,
Lex S., MSEE
SciChart Technical Support Engineer

Lex:

I appreciate your answering; I have found the bug while formulating my response. Unfortunately, my XAML was filtered by your automated system, but it ended up being my bad in the code behind. I am posting here so that others may benefit from my mistake.

Explanation:
SubstanceMetadata is a class that implements from SciChart’s IPointMetadata interface. I use it to provide some rollover annotations to the chart. The “IsSelected” base class field was being reset each update due to the new instance of metadata being inserted each time the model was updated. What I instead needed to do was update the current metadata so it would retain the “IsSelected” property. (massMap is just an array offset in order to map X values to array indicies)

Old (VB.NET):

Private Sub ModifySeries(model As SubstanceModel, ByRef series As List(Of XyDataSeries(Of Integer, Single)))
Dim i = 0
Dim massMap As Integer = model.HistoModel.StartAMU
For Each material In model.Substances.Values
Dim mag = material.Substance.Magnitude
Dim j = 0
For Each fragPattern In material.Substance.Fragmentations
‘Issue was rebuilding the substance metadata.
series(i).Update(fragPattern.Mass – massMap, fragPattern.Ratio / mag * material.Concentration, New SubstanceMetadata With {.TotalConcentration = material.Concentration, .TotalPercentage = material.Percentage})
j += 1
Next
i += 1
Next
End Sub

Updated (VB.NET):

Dim i = 0
Dim massMap As Integer = model.HistoModel.StartAMU
For Each material In model.Substances.Values
Dim mag = material.Substance.Magnitude
Dim j = 0
For Each fragPattern In material.Substance.Fragmentations
‘Below code was updated…
Dim correctMData As SubstanceMetadata = series(i).Metadata(fragPattern.Mass – massMap)
correctMData.TotalConcentration = material.Concentration
correctMData.TotalPercentage = material.Percentage
series(i).Update(fragPattern.Mass – massMap, fragPattern.Ratio / mag * material.Concentration)
j += 1
Next
i += 1
Next

Thank You,
Nicholas Louks