Infragistics Forums

Is there a way to make the legend more readable for a LineChart on a CompositeChart.  To make it easier to understand my question I have included the image of my sample app:

The lines on the legend are so small that it is difficult to tell what they are.  I am using NetAdvantage for Windows Forms 2008 Vol. 1.  I would appreciate any advice.

Thanks,
Kerry Jenkins

you can use FillSceneGraph or ChartDtawItem event to do this.

private void ultraChart1_FillSceneGraph(object sender, Infragistics.UltraChart.Shared.Events.FillSceneGraphEventArgs e)
{
   foreach (Primitive p in e.SceneGraph)
   {
      Polyline poly = p as Polyline;
      if (poly!= null && poly.Path!=null && poly.Path.ToLower().IndexOf("legend") != -1)
      {
         poly.PE.StrokeWidth = 5;
      }
   }
}

That worked great!

Thanks

[Infragistics] Max Rivlin:

you can use FillSceneGraph or ChartDtawItem event to do this.

private void ultraChart1_FillSceneGraph(object sender, Infragistics.UltraChart.Shared.Events.FillSceneGraphEventArgs e)
{
   foreach (Primitive p in e.SceneGraph)
   {
      Polyline poly = p as Polyline;
      if (poly!= null && poly.Path!=null && poly.Path.ToLower().IndexOf("legend") != -1)
      {
         poly.PE.StrokeWidth = 5;
      }
   }
}

How would you do this is 2007 Vol.1 version? It doesn't seem to contain a SceneGraph collection.

For any version below 7.3 you have to implement a custom layer and put that code in FillSceneGraph method.

Here's the help link with information on how to implement a custom layer:
http://help.infragistics.com/Help/NetAdvantage/NET/2008.2/CLR2.0/html/Chart_Writing_a_Layer_Class.html

[Infragistics] Max Rivlin:

For any version below 7.3 you have to implement a custom layer and put that code in FillSceneGraph method.

Here's the help link with information on how to implement a custom layer:
http://help.infragistics.com/Help/NetAdvantage/NET/2008.2/CLR2.0/html/Chart_Writing_a_Layer_Class.html

Hi Max,

 Thanks for the quick response. I've implemented the custom layer and have added it to my ASPX page. However, I got a runtime error. The error is "Specified cast is not valid".

Here is the code for the FillSceneGraph implementation in the custom layer:

Public Sub FillSceneGraph(ByVal scene As Infragistics.UltraChart.Core.SceneGraph) Implements Infragistics.UltraChart.Core.Layers.ILayer.FillSceneGraph

For Each p As Primitive In scene

Dim poly As Polyline = CType(p, Polyline) 'The error is on this line

If Not poly Is Nothing AndAlso Not poly.Path = Nothing AndAlso Not poly.Path.ToLower().IndexOf("legend) = -1 Then

poly.PE.StrokeWidth = 5

End If

Next

End Sub

This is where I'm actually calling the above layer (after I've set up the Legend stuff):

chart.CompositeChart.Legends.Add(legend)

chart.Layer.Add("SceneGraph Layer", New SceneGraphLayer)

chart.UserLayerIndex = New String() {"Default", "SceneGraph Layer"}

chart.InvalidateLayers()

Any further help would be appreciated.

use

dim poly as Polyline
if (typeof p is Polyline) then
   poly = CType(p, Polyline)
endif

CType cannot handle this cast directly