ArcObjects Library Reference (Carto)

ITopologyLayer.Renderer Property

[Visual Basic .NET]
Public Function get_Renderer ( _
    ByVal Index As esriTopologyRenderer _
) As IFeatureRenderer

[Visual Basic .NET]
Public Sub set_Renderer ( _
    ByVal Index As esriTopologyRenderer, _
    ByVal Renderer As IFeatureRenderer _
)

[C#]
public IFeatureRenderer get_Renderer (
    esriTopologyRenderer Index
);

[C#]
public void set_Renderer (
    esriTopologyRenderer Index,
    IFeatureRenderer Renderer
);

[C++]
HRESULT get_Renderer(
  esriTopologyRenderer Index,
  IFeatureRenderer** Renderer
);

[C++]
HRESULT putref_Renderer(
  esriTopologyRenderer Index,
  IFeatureRenderer* Renderer
);

[C++]
Parameters
Index [in]
  Index is a parameter of type esriTopologyRenderer
Renderer [out, retval]
  Renderer is a parameter of type IFeatureRenderer
Index [in]
  Index is a parameter of type esriTopologyRenderer
Renderer [in]
  Renderer is a parameter of type IFeatureRenderer

Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server.

[C#]

The following routine sets up a unique value renderer for a topology layer. 

 

private void BuildUniqueValRenderer()
{

  IMxDocument mxDocument = (IMxDocument)m_application.Document;

  ITopologyLayer topologyLayer = mxDocument.FocusMap.get_Layer(0) as ITopologyLayer;
  if (topologyLayer == null)
    throw new NullReferenceException();

  ITopology topology = topologyLayer.Topology;
  if (topology == null)
    throw new NullReferenceException();

  //build colorramp
  IRandomColorRamp randomColorRamp = new RandomColorRampClass();
  randomColorRamp.MinSaturation = 20;
  randomColorRamp.MaxSaturation = 40;
  randomColorRamp.MinValue = 85;
  randomColorRamp.MaxValue = 100;
  randomColorRamp.StartHue = 76;
  randomColorRamp.EndHue = 188;
  randomColorRamp.UseSeed = true;
  randomColorRamp.Seed = 43;

  //build unique value renderer
  IUniqueValueRenderer uniqueValRenderer = new UniqueValueRendererClass();
  uniqueValRenderer.FieldCount = 1;
  uniqueValRenderer.set_Field(0,"TopoRuleType");
  uniqueValRenderer.DefaultSymbol = null;
  uniqueValRenderer.UseDefaultSymbol = false;
  uniqueValRenderer.set_FieldType(0, false);

  //iterate through topology rules and add value to renderer for each
  ITopologyRuleContainer topoRuleContainer = (ITopologyRuleContainer)topology;
  IEnumRule enumRule = topoRuleContainer.Rules;
  ITopologyRule topoRule = (ITopologyRule)enumRule.Next();
  while (topoRule != null)     
  {
    uniqueValRenderer.AddValue(((int)topoRule.TopologyRuleType).ToString(),"Error",
      (ISymbol)BuildErrorLineSym());
    uniqueValRenderer.set_Label(((int)topoRule.TopologyRuleType).ToString(),
      topoRule.Name);

    topoRule = (ITopologyRule)enumRule.Next();
  }

  randomColorRamp.Size = uniqueValRenderer.ValueCount;

  bool bCreated = false;
  randomColorRamp.CreateRamp(out bCreated);

  IEnumColors enumColors = randomColorRamp.Colors;

  for(int i = 0; i < uniqueValRenderer.ValueCount - 1; i++)
  {
    string val = uniqueValRenderer.get_Value(i);

    if (val == "")
      continue;
   
    ISymbol sym = uniqueValRenderer.get_Symbol(val);
    ((ISimpleLineSymbol)sym).Color = enumColors.Next();
    uniqueValRenderer.set_Symbol(val, sym);
   
  }

  uniqueValRenderer.ColorScheme = "Custom";

  topologyLayer.set_Renderer(esriTopologyRenderer.esriTRLineErrors,
    (IFeatureRenderer)uniqueValRenderer);

  mxDocument.UpdateContents();
  mxDocument.ActiveView.Refresh();

}

private ISimpleLineSymbol BuildErrorLineSym()
{
  ISimpleLineSymbol simLineSymbol = new SimpleLineSymbolClass();
  simLineSymbol.Style = esriSimpleLineStyle.esriSLSDashDotDot;
  simLineSymbol.Width = 2.5;

  return simLineSymbol;
}