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WPF Legend Visibility Issue

Hi All,

 

I have an application where I have to plot data based on user selection and show them in a legend. So I have to create plots dynamically and add plot labels from a ViewModel

ranger007_0-1640246973378.png

 

Then I have binded Legend to these plots and got the labels displayed on legend.

ranger007_1-1640246973351.png

 

ranger007_2-1640246973329.png

 

 

 The problem is - clicking on the legend items no longer change the visibility of the plots. 

 

 Can you please help?

 

Thanks,

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Unfortunately, I could not reproduce the issue based on the code snippets you showed. Here is the XAML I used to define the graph and legend in my test project:

 

<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="3*" />
        <ColumnDefinition Width="*" />
    </Grid.ColumnDefinitions>

    <ni:Graph x:Name="AnalysisGraph" />

    <ni:Legend Grid.Column="1" ItemsSource="{Binding ElementName=AnalysisGraph, Path=AllPlots}" />
</Grid>

 

 

And the code used to populate it with random data:

 

public MainWindow( ) {
    InitializeComponent( );

    var random = new Random( );
    for( int i = 0; i < 2; i += 1 ) {
        double offset = i * 2;
        double[] load = GetData( random, offset - 0.5 );
        double[] position = GetData( random, offset + 0.5 );
        string name = "Test" + (i + 1);

        AnalysisGraph.Plots.Add( new Plot( name + ". Load" ) );
        AnalysisGraph.Data.Add( new List<object>( ) { load } );
        AnalysisGraph.Plots.Add( new Plot( name + ". Position" ) );
        AnalysisGraph.Data.Add( new List<object>( ) { position } );
    }
}

 

 

Clicking on the legend glyphs shows and hides the corresponding plot like normal (see "Test2. Load"):

phansen_0-1640279050738.png

 

You may want to try using WPF Snoop to debug if there is a binding problem with the legend glyph.

~ Paul H
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