How to bind plots on WPF graph

[Boulive69]

Hi,

Is there a way to bind plots (plot collection) to a graph.

I'm using a graph with multiple plots. I bind the datasource  with an observablecollection for the data values => the default plots are shown, perfect.

but now I want to manage these plots (color, axis etc..). For that I have to use plots. I can define manually plots in XAML.

but I want to add or remove plots at runtime. The datasource is perfect for data values but I have not found the same for plots. In the MVVM concept, is there a way to bind plots with a collection.

Thanks for any help.

O .Daniere

[phansen]

There is no equivalent to DataSource for plots. There is a DefaultPlotRenderers collection for customizing the default appearance of plots, but nothing for configuring other properties like associated axes.

There is a primitve type available that can be used to synchronize a model collection with e.g. the Plots collection on a graph:

    var plots = new ObservableCollection<Plot>( ... );
    var synchronizer = new NationalInstruments.Controls.Primitives.CollectionViewSynchronizer( );
    synchronizer.SourceCollection = CollectionViewSource.GetDefaultView( plots );
    synchronizer.TargetCollection = graph.Plots;

You could use this in code, or create an attached "GraphExtensions.PlotsSource" dependency property that performs the same action when the property value changes.

[Boulive69]

Thanks for your response Paul.

I have another question regarding the PlotRenderer binding :

Using XAML I can bind the plot color to a class property like this :

<ni:Graph x:Name="MyGraph">

   <ni:Graph.Plots>

      <ni:Plot Label="Plot 1">

         <ni:LinePlotRenderer Stroke="{Binding PlotLineColor}" />

      </ni:Plot>

   </ni:Graph.Plots>

</ni:Graph>

With this code behind in VB.NET 2012 (MyGraphVM contains the PlotLineColor property):

        MyGraph.Plots(0).DataContext = MyGraphVM

And it works.

But, I can't do the same binding by code (for example using Plot.setBinding()).

Do you have an example?

What is the best way to bind plot's properties (color, shape, etc)?

O. Daniere.

[phansen]

You can use the BindingOperations.SetBinding method to set a binding on a plot renderer:

    var renderer = plot.Renderer;
    var binding = new Binding( "PlotLineColor" ) { Source = MyGraphVM };
    BindingOperations.SetBinding( renderer, LinePlotRenderer.StrokeProperty, binding );

[Boulive69]

Thanks Paul, it works perfectly.

O. Daniere

[phansen]

By the way, I have created the "GraphExtensions.PlotsSource" example I mentioned earlier in an answer to another question.