GetLeftParentFeatures Method
Gets the set of parents (polygon features) that cover this edge. If is true, then only polygons lying to the left of the edge will be returned. This method must be called on the MCT. Use QueuedTask.Run.
Parameters
- boundedByEdge
- Indicates whether all parent features that cover this edge are returned. If true, only polygons lying to the left of the edge will be returned. The default value is
true
.
Return Value
The set of parents (polygon features) that cover this edge. If is true, then only polygons lying to the left of the edge will be returned.
ExploreTopologyGraph
public void ExploreTopologyGraph()
{
using (Geodatabase geodatabase = new Geodatabase(new FileGeodatabaseConnectionPath(new Uri(@"C:\TestData\GrandTeton.gdb"))))
using (Topology topology = geodatabase.OpenDataset<Topology>("Backcountry_Topology"))
{
// Build a topology graph using the extent of the topology dataset.
topology.BuildGraph(topology.GetExtent(), (topologyGraph) =>
{
using (Feature campsites12 = GetFeature(geodatabase, "Campsites", 12))
{
IReadOnlyList<TopologyNode> topologyNodesViaCampsites12 = topologyGraph.GetNodes(campsites12);
TopologyNode topologyNodeViaCampsites12 = topologyNodesViaCampsites12[0];
IReadOnlyList<TopologyEdge> allEdgesConnectedToNodeViaCampsites12 = topologyNodeViaCampsites12.GetEdges();
IReadOnlyList<TopologyEdge> allEdgesConnectedToNodeViaCampsites12CounterClockwise = topologyNodeViaCampsites12.GetEdges(false);
System.Diagnostics.Debug.Assert(allEdgesConnectedToNodeViaCampsites12.Count == allEdgesConnectedToNodeViaCampsites12CounterClockwise.Count);
foreach (TopologyEdge edgeConnectedToNodeViaCampsites12 in allEdgesConnectedToNodeViaCampsites12)
{
TopologyNode fromNode = edgeConnectedToNodeViaCampsites12.GetFromNode();
TopologyNode toNode = edgeConnectedToNodeViaCampsites12.GetToNode();
bool fromNodeIsTheSameAsTopologyNodeViaCampsites12 = (fromNode == topologyNodeViaCampsites12);
bool toNodeIsTheSameAsTopologyNodeViaCampsites12 = (toNode == topologyNodeViaCampsites12);
System.Diagnostics.Debug.Assert(fromNodeIsTheSameAsTopologyNodeViaCampsites12 || toNodeIsTheSameAsTopologyNodeViaCampsites12,
"The FromNode *or* ToNode of each edge connected to 'topologyNodeViaCampsites12' should be the same as 'topologyNodeViaCampsites12' itself.");
IReadOnlyList<FeatureInfo> leftParentFeaturesBoundedByEdge = edgeConnectedToNodeViaCampsites12.GetLeftParentFeatures();
foreach (FeatureInfo featureInfo in leftParentFeaturesBoundedByEdge)
{
System.Diagnostics.Debug.Assert(!String.IsNullOrEmpty(featureInfo.FeatureClassName));
System.Diagnostics.Debug.Assert(featureInfo.ObjectID > 0);
EnsureShapeIsNotEmpty(featureInfo);
}
IReadOnlyList<FeatureInfo> leftParentFeaturesNotBoundedByEdge = edgeConnectedToNodeViaCampsites12.GetLeftParentFeatures(false);
foreach (FeatureInfo featureInfo in leftParentFeaturesNotBoundedByEdge)
{
System.Diagnostics.Debug.Assert(!String.IsNullOrEmpty(featureInfo.FeatureClassName));
System.Diagnostics.Debug.Assert(featureInfo.ObjectID > 0);
EnsureShapeIsNotEmpty(featureInfo);
}
IReadOnlyList<FeatureInfo> rightParentFeaturesBoundedByEdge = edgeConnectedToNodeViaCampsites12.GetRightParentFeatures();
foreach (FeatureInfo featureInfo in rightParentFeaturesBoundedByEdge)
{
System.Diagnostics.Debug.Assert(!String.IsNullOrEmpty(featureInfo.FeatureClassName));
System.Diagnostics.Debug.Assert(featureInfo.ObjectID > 0);
EnsureShapeIsNotEmpty(featureInfo);
}
IReadOnlyList<FeatureInfo> rightParentFeaturesNotBoundedByEdge = edgeConnectedToNodeViaCampsites12.GetRightParentFeatures(false);
foreach (FeatureInfo featureInfo in rightParentFeaturesNotBoundedByEdge)
{
System.Diagnostics.Debug.Assert(!String.IsNullOrEmpty(featureInfo.FeatureClassName));
System.Diagnostics.Debug.Assert(featureInfo.ObjectID > 0);
EnsureShapeIsNotEmpty(featureInfo);
}
}
}
});
}
}
private void EnsureShapeIsNotEmpty(FeatureInfo featureInfo)
{
using (Feature feature = featureInfo.GetFeature())
{
System.Diagnostics.Debug.Assert(!feature.GetShape().IsEmpty, "The feature's shape should not be empty.");
}
}
Target Platforms: Windows 11, Windows 10
ArcGIS Pro version: 3 or higher.