topic Re: How to create feature layer symbology in ArcGIS API for Silverlight Questions

How to create feature layer symbology

DonFreeman — Wed, 12 Jan 2011 20:36:31 GMT

Hi -
I am trying to set up a feature layer with symbology that overrides the default symbology that is defined in the map service. My code is below but the map still displays with the default red circle rather than the green diamond. Can someone see what I am doing wrong? Other than the symbology issue it seems to work OK.
Thanks

<Grid Name="MapGrid" Grid.Row="0">
   <Grid.Resources>
    <esriSymbols:SimpleMarkerSymbol x:Name="MyMarkerSymbol" Color="Green" Style="Diamond" Size="10" />    
   </Grid.Resources>
  
   <esri:Map x:Name="MyMap" Grid.RowSpan="2" >
    <esri:Map.Layers>

     <esri:ArcGISDynamicMapServiceLayer ID="SchoolSearch3" 
      Url="http://198.182.104.173/ArcGIS/rest/services/SchoolSearch3/MapServer"
      VisibleLayers="0,1" />

     <esri:FeatureLayer ID="MyFeatureLayer" 
      Url="http://198.182.104.173/ArcGIS/rest/services/BikeCounts_Test/MapServer/0"
      MouseLeftButtonUp="FeatureLayer_MouseLeftButtonUp"
      DisableClientCaching="True"
      Mode="OnDemand"
      OutFields="*" 
      SelectionColor="Yellow"     
      FeatureSymbol="{StaticResource MyMarkerSymbol}"
      Where="1=1" 
      />
     
    </esri:Map.Layers>
   </esri:Map>

  </Grid>

Re: How to create feature layer symbology

JenniferNery — Sat, 11 Dec 2021 12:53:35 GMT

The FeatureLayer's Renderer trumps FeatureSymbol. Since the service already defines a Renderer, the FeatureSymbol is ignored. The only way you can override the Renderer defined by the service is to create your own renderer.

For example:
Under Resources...

  <esri:SimpleRenderer x:Key="MyRenderer">
   <esri:SimpleRenderer.Symbol>
    <esri:SimpleMarkerSymbol Color="Red" Style="Circle" Size="10"/>
   </esri:SimpleRenderer.Symbol>
  </esri:SimpleRenderer>

FeatureLayer..

<esri:FeatureLayer Url="http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/HomelandSecurity/operations/FeatureServer/0"
          Renderer="{StaticResource MyRenderer}"/>

Re: How to create feature layer symbology

DonFreeman — Wed, 12 Jan 2011 22:01:47 GMT

Jennifer -
Thanks. That looks simple enough. I will give it a try. Is there a way to create the service so that it doesn't define a built in renderer?

Thanks

Re: How to create feature layer symbology

JenniferNery — Wed, 12 Jan 2011 22:32:35 GMT

I'm not sure, I have not created a service but you might want to check this documentation: http://help.arcgis.com/en/arcgisserver/10.0/help/arcgis_server_dotnet_help/index.html#/Authoring_feature_services/009300000021000000/. "Defining a symbology" under Setting up the Map Document.

Re: How to create feature layer symbology

DonFreeman — Sat, 11 Dec 2021 12:53:37 GMT

The FeatureLayer's Renderer trumps FeatureSymbol. Since the service already defines a Renderer, the FeatureSymbol is ignored. The only way you can override the Renderer defined by the service is to create your own renderer.

For example:
Under Resources...
  <esri:SimpleRenderer x:Key="MyRenderer">
   <esri:SimpleRenderer.Symbol>
    <esri:SimpleMarkerSymbol Color="Red" Style="Circle" Size="10"/>
   </esri:SimpleRenderer.Symbol>
  </esri:SimpleRenderer>
FeatureLayer..
<esri:FeatureLayer Url="http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/HomelandSecurity/operations/FeatureServer/0"
          Renderer="{StaticResource MyRenderer}"/>

Jenn -
Thanks so much. I tried your code and it works fine for me except now the selection color is inoperative. How would you provide for that? Would I need another renderer with a different symbol? My code:

<Grid Name="MapGrid" Grid.Row="0">
   <Grid.Resources>    
    <esri:SimpleRenderer x:Key="MyRenderer">
     <esri:SimpleRenderer.Symbol>
      <esriSymbols:SimpleMarkerSymbol x:Name="MyMarkerSymbol" Color="Green" Style="Diamond" Size="10" />
     </esri:SimpleRenderer.Symbol>
    </esri:SimpleRenderer>
   </Grid.Resources>
  
   <esri:Map x:Name="MyMap" Grid.RowSpan="2" >
    <esri:Map.Layers>

     <esri:ArcGISDynamicMapServiceLayer ID="SchoolSearch3" 
      Url="http://198.182.104.173/ArcGIS/rest/services/SchoolSearch3/MapServer"
      VisibleLayers="0,1" />

    <esri:FeatureLayer ID="MyFeatureLayer" 
      Url="http://198.182.104.173/ArcGIS/rest/services/BikeCounts_Test/MapServer/0"
      MouseLeftButtonUp="FeatureLayer_MouseLeftButtonUp"
      DisableClientCaching="True"
      Mode="OnDemand"
      OutFields="*" 
      SelectionColor="Cyan"     
      Renderer="{StaticResource MyRenderer}"
      Where="1=1" 
      />
     
    </esri:Map.Layers>
   </esri:Map>

  </Grid>

Re: How to create feature layer symbology

DominiqueBroux — Sat, 11 Dec 2021 12:53:40 GMT

I tried your code and it works fine for me except now the selection color is inoperative. How would you provide for that? Would I need another renderer with a different symbol?

You can keep the same renderer but use a symbol managing the 'Selected' state.

Example coming from the interactive samples:

<esriSymbols:MarkerSymbol x:Key="SelectMarkerSymbol" >
<esriSymbols:MarkerSymbol.ControlTemplate>
<ControlTemplate>
<Ellipse x:Name="Element" Width="15" Height="15" StrokeThickness="10" 
Stroke="Green" >
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="SelectionStates">
<VisualState x:Name="Unselected" />
<VisualState x:Name="Selected">
<Storyboard>
<ColorAnimation Storyboard.TargetName="Element" 
Storyboard.TargetProperty="(Ellipse.Stroke).(SolidColorBrush.Color)"
To="Cyan" Duration="00:00:0.25"/>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
</Ellipse>
</ControlTemplate>
</esriSymbols:MarkerSymbol.ControlTemplate>
</esriSymbols:MarkerSymbol>

Re: How to create feature layer symbology

DonFreeman — Thu, 13 Jan 2011 16:33:22 GMT

Thanks Dominique. This certainly works although I find it extremely complex for such a simple task. (Oh well, that's ESRI) What would you do if you wanted a shape other than ellipse? Perhaps Square or Diamond. I can't seem to get them to work.

Re: How to create feature layer symbology

DanielWalton — Thu, 13 Jan 2011 16:39:14 GMT

For square use Rectangle instead of Ellipse. For diamond use

[HTML]
<Rectangle RenderTransformOrigin=".5,.5">
<Rectangle.RenderTransform>
<RotateTransform Angle="45" />
</Rectangle.RenderTransform>
</Rectangle>
[/HTML]

The complexity isn't just ESRI's fault. Blame Microsoft too. 🙂

Re: How to create feature layer symbology

DonFreeman — Thu, 13 Jan 2011 18:05:45 GMT

Thanks Dan. Yes, MS is equally to blame if not more so.

Re: How to create feature layer symbology

DonFreeman — Fri, 14 Jan 2011 19:14:51 GMT

Now that I have the ability to modify the feature symbols, I would like to know if the following is possible or feasible. My map contains a point layer drawn from a Map service (not a feature service). There is a second table (Table2) which is associated with the point layer in a 1 to many relationship. The user clicks a point on the map and the related records (usually 2) are shown in a datagrid below the map. The user can edit the records in Table2 to "claim" the point. If both of the records associated with a point have been claimed I would like to either remove the point from the map or display it with a different color symbol so that subsequent users will readily see that the point has been taken and it is no longer available for editing.

The technique I have in mind is on page load to iterate through the points and for each point to query Table2. If no records match the unclaimed criteria then the point symbol for that point would be changed indicating that it has been claimed. Does this sound like it would be a reasonable undertaking and if so could someone get me started on how to do it?
Thanks