Can I bind the stroke thickness in the chart to my view model's property?

Hi,

I understand that we can specify the LineStyle in the SplineSeries in the Chart control. For example:

  <Style x:Key="ShadowLineStyle" TargetType="Path">
     <Setter Property="StrokeThickness" Value="3" />
     <!--<Setter Property="StrokeThickness" Value="{Binding DataContext.CurveSize}" />-->
     <Setter Property="Effect">
        <Setter.Value>
           <DropShadowEffect Direction="-45" Color="Black" Opacity="0.5" ShadowDepth="4"/>
        </Setter.Value>
     </Setter>
  </Style>   

But what I want to do is to allow the user to configure the thickness of the line. I wonder if there's a good way of setting the thickness through binding so that I can change the line size dynamically. I tried a few things. With some setup, the code "<Setter Property="StrokeThickness" Value="{Binding DataContext.CurveSize}" />" could work for the SplineSeries. However, the legend does not pick that up. Any advice?

Thanks, Sean

Hi Sean,

Great that you got it working for the series. For the legend, I would recommend trying to set the LegendIconTemplate property of the series. This will allow you to customize the legend icon to include a binding like what you did with the series. Rather than binding through the DataContext though, you'd bind through the DataSeries property on the LegendItem (That the template will get applied to). The DataSeries on the LegendItem is the same as the DataContext on the series.

Hope that helps, let me know if you have any problems or questions.

-Jason Fauchelle

Hi Jason,

Thank you for the advice. I found your default LegendIconTemplate from your source code and made some changes to make a new template. Then I used this custom template and it worked.

But it comes to my next question. The series title in the legend does not work so well. It always shows "Series 1, Series 2, etc." once I refresh my DataSeries binding. My DataSeries Title is bound to my view model's Title.

Thanks, Sean

Hi Sean,

Unfortunately I have not been able to reproduce this problem at my end. Could you please provide a simple repro project so that I can look into this further.

-Jason Fauchelle