Creates topo elements from all topology feature classes intersecting the specified polygon. The topology graph takes ownership of the input polygon.
[Visual Basic .NET] Public Sub BuildFromPolygon ( _ ByVal Extent As IPolygon, _ ByVal preserveSelection As Boolean _ )
[C#] public void BuildFromPolygon ( IPolygon Extent, bool preserveSelection );
[C++]
HRESULT BuildFromPolygon(
IPolygon* Extent,
VARIANT_BOOL preserveSelection
);
[C++]Parameters
ExtentExtent is a parameter of type IPolygon
preserveSelection preserveSelection is a parameter of type VARIANT_BOOL
Product Availability
Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server.
Remarks
This method is very similar to Build, except the extent of the build isn't restricted to a rectangular envelope; any polygon can be used to define the build area.
[C#]
bool BuildTopoGraph(IGeometry buildGeom, ITopologyGraph topoGraph, bool
keepSelection)
{
if (buildGeom == null || topoGraph == null)
return false;
switch (buildGeom.GeometryType)
{
case esriGeometryType.esriGeometryPolygon:
{
ITopologyGraph4 topoGraph4 = topoGraph as ITopologyGraph4;
topoGraph4.BuildFromPolygon((IPolygon)buildGeom, keepSelection);
return true;
}
case esriGeometryType.esriGeometryEnvelope:
{
topoGraph.Build((IEnvelope)buildGeom, keepSelection);
return true;
}
default:
return false;
}
}[Visual Basic .NET]
Private Function BuildTopoGraph(ByVal buildGeom As IGeometry, ByVal topoGraph As ITopologyGraph, ByVal keepSelection As Boolean) As Boolean
If buildGeom Is Nothing OrElse topoGraph Is Nothing Then
Return False
End If
Select Case buildGeom.GeometryType
Case esriGeometryType.esriGeometryPolygon
Dim topoGraph4 As ITopologyGraph4 = TryCast(topoGraph, ITopologyGraph4)
topoGraph4.BuildFromPolygon(CType(buildGeom, IPolygon), keepSelection)
Return True
Case esriGeometryType.esriGeometryEnvelope
topoGraph.Build(CType(buildGeom, IEnvelope), keepSelection)
Return True
Case Else
Return False
End Select
End Function