private void method_2()
{
object ilineSymbol0;
if (CmdSelectTopology.m_TopologyGraph != null && this._context.Hook is IMapControl2)
{
IMapControl2 hook = (IMapControl2)this._context.Hook;
IEnumTopologyEdge edgeSelection = CmdSelectTopology.m_TopologyGraph.EdgeSelection;
edgeSelection.Reset();
ITopologyEdge topologyEdge = edgeSelection.Next();
if (topologyEdge != null)
{
ilineSymbol0 = this.ilineSymbol_0;
while (topologyEdge != null)
{
hook.DrawShape(topologyEdge.Geometry, ref ilineSymbol0);
topologyEdge = edgeSelection.Next();
}
}
IEnumTopologyNode nodeSelection = CmdSelectTopology.m_TopologyGraph.NodeSelection;
nodeSelection.Reset();
ITopologyNode topologyNode = nodeSelection.Next();
if (topologyNode != null)
{
ilineSymbol0 = this.imarkerSymbol_0;
while (topologyNode != null)
{
hook.DrawShape(topologyNode.Geometry, ref ilineSymbol0);
topologyNode = nodeSelection.Next();
}
}
}
}
private void method_3(IDisplay idisplay_0, esriViewDrawPhase esriViewDrawPhase_0)
{
if ((CmdSelectTopology.m_TopologyGraph == null ? false : this.Enabled))
{
IEnumTopologyEdge edgeSelection = CmdSelectTopology.m_TopologyGraph.EdgeSelection;
edgeSelection.Reset();
ITopologyEdge topologyEdge = edgeSelection.Next();
object value = Missing.Value;
if (topologyEdge != null)
{
IGeometryCollection polylineClass = new Polyline() as IGeometryCollection;
while (topologyEdge != null)
{
polylineClass.AddGeometryCollection((IGeometryCollection)topologyEdge.Geometry);
topologyEdge = edgeSelection.Next();
}
idisplay_0.SetSymbol((ISymbol)this.ilineSymbol_0);
idisplay_0.DrawPolyline((IGeometry)polylineClass);
}
IEnumTopologyNode nodeSelection = CmdSelectTopology.m_TopologyGraph.NodeSelection;
nodeSelection.Reset();
ITopologyNode topologyNode = nodeSelection.Next();
if (topologyNode != null)
{
IPointCollection multipointClass = new Multipoint();
while (topologyNode != null)
{
multipointClass.AddPoint((IPoint)topologyNode.Geometry, ref value, ref value);
topologyNode = nodeSelection.Next();
}
idisplay_0.SetSymbol((ISymbol)this.imarkerSymbol_0);
idisplay_0.DrawMultipoint((IGeometry)multipointClass);
}
}
}
private void method_1(IDisplay idisplay_0)
{
if (CmdSelectTopology.m_TopologyGraph != null)
{
IEnumTopologyEdge edgeSelection = CmdSelectTopology.m_TopologyGraph.EdgeSelection;
edgeSelection.Reset();
ITopologyEdge topologyEdge = edgeSelection.Next();
if (topologyEdge != null)
{
IPolyline polylineClass = new Polyline() as IPolyline;
idisplay_0.SetSymbol((ISymbol)this.ilineSymbol_0);
while (topologyEdge != null)
{
idisplay_0.DrawPolyline(topologyEdge.Geometry);
topologyEdge = edgeSelection.Next();
}
}
IEnumTopologyNode nodeSelection = CmdSelectTopology.m_TopologyGraph.NodeSelection;
nodeSelection.Reset();
ITopologyNode topologyNode = nodeSelection.Next();
if (topologyNode != null)
{
IMultipoint multipointClass = new Multipoint() as IMultipoint;
idisplay_0.SetSymbol((ISymbol)this.imarkerSymbol_0);
while (topologyNode != null)
{
idisplay_0.DrawPoint(topologyNode.Geometry);
topologyNode = nodeSelection.Next();
}
}
}
}
/// <summary>
/// Traverse the topology graph, <see cref="ITopologyGraph"/>, to visit topology elements <see cref="ITopologyElement"/>
/// </summary>
/// <param name="featureDataset">Feature dataset object</param>
/// <param name="topologyName">The topology name</param>
/// <param name="featureClassName">The feature class name</param>
/// <param name="originFeatureObjectId">Feature ObjectId from the feature class, <paramref name="featureClassName"/></param>
/// <returns>A JSON object <see cref="JsonObject"/> containing parcels' id and address</returns>
/// <remarks>
/// This method builds the topology graph around origin parcel feature and traverse the topology graph to fetch its adjoining parcels and their addresses
/// </remarks>
public JsonObject TraverseTopologyGraph(IFeatureDataset featureDataset, string topologyName, string featureClassName, int originFeatureObjectId)
{
// Fetch feature class by name
IFeatureClass parcelFeatureClass = GetFeatureClass(featureDataset, featureClassName);
// Fetch topology by name from feature dataset
ITopology topology = GetTopologyFromFeatureDataset(featureDataset, topologyName);
// Get the origin parcel feature identified by ObjectID
IFeature parcelFeature = GetFeature(parcelFeatureClass, originFeatureObjectId);
ITopologyGraph topologyGraph = topology.Cache;
// Build the topology graph around the origin parcel feature
topologyGraph.Build(parcelFeature.Shape.Envelope, false);
IEnumTopologyEdge enumTopologyEdge = topologyGraph.GetParentEdges(parcelFeatureClass, originFeatureObjectId);
enumTopologyEdge.Reset();
List <dynamic> taxParcelIds = new List <dynamic>();
IEnvelope topologyParentsEnvelope = new EnvelopeClass();
Dictionary <int, IPoint> parcelsToCentroidMap = new Dictionary <int, IPoint>();
for (int topoEdgeCount = 0; topoEdgeCount < enumTopologyEdge.Count; topoEdgeCount++)
{
ITopologyEdge topologyEdge = enumTopologyEdge.Next();
// Parents of the topology edge
IEnumTopologyParent parents = topologyEdge.Parents;
parents.Reset();
for (int parentsCount = 0; parentsCount < parents.Count; parentsCount++)
{
esriTopologyParent parent = parents.Next();
int parentFID = parent.m_FID;
IFeatureClass parentFC = parent.m_pFC;
IFeature parentParcelFeature = parentFC.GetFeature(parentFID);
// Get the index of 'ParcelType' field from the parcel feature class
int parcelTypeIndex = parentParcelFeature.Fields.FindField("PARCELTYPE");
// Get parcel type value
int parcelTypeValue = Convert.ToInt32(parentParcelFeature.Value[parcelTypeIndex]);
// Avoid duplicates and skip parcels with 'RowOverlap' subtype
if (parentFC == parcelFeatureClass && !taxParcelIds.Contains(parentFID) && parentFID != originFeatureObjectId && (parcelTypeValue < 8 && parcelTypeValue > 0))
{
taxParcelIds.Add(parentFID);
// Envelope of a parcel
IEnvelope parcelEnvelope = parentParcelFeature.Extent.Envelope;
// Centroid of a parcel
IArea parcelArea = parcelEnvelope as IArea;
IPoint parcelCentroid = parcelArea.Centroid;
// Add parcel id and centroid to the mapping dictionary
parcelsToCentroidMap.Add(parentFID, parcelCentroid);
// Union of the adjoining parcels' envelope
topologyParentsEnvelope.Union(parcelEnvelope);
}
}
}
// Update topology graph to include adjoining parcels
topologyGraph.Build(topologyParentsEnvelope, false);
JsonObject jsonObject = new JsonObject();
// Get adjoining parcels and their addresses
List <string> parcelWithAddressList = GetParcelsWithAddress(topologyGraph, parcelsToCentroidMap);
// Format JSON array
jsonObject.AddArray($"Adjoining parcels of {originFeatureObjectId}", parcelWithAddressList?.ToArray());
return(jsonObject);
}
