+ // Treat the case if the wire is closed and first and last edges are C1.
+ Standard_Boolean isShift = Standard_False;
+
+ if (BRep_Tool::IsClosed(theWire)) {
+ // Wire is closed. Check if there are more than 2 edges in the wire.
+ if (!anEdges.First().IsSame(anEdges.Last())) {
+ isShift = Standard_True;
+ }
+ }
+
+ if (isShift) {
+ // Put first edge to the end of the list while the chain break is reached.
+ TopoDS_Shape aFirstEdge = anEdges.First();
+
+ while (isShift) {
+ isShift = Standard_False;
+
+ // Check if the first vertex should be kept
+ if (aMapToRemove.Contains(aCurVertices.First()) || removeAll) {
+ // Check if first and last edges are C1.
+ TopoDS_Edge anEdge1 = TopoDS::Edge(anEdges.Last());
+ TopoDS_Edge anEdge2 = TopoDS::Edge(anEdges.First());
+
+ if (AreEdgesC1(anEdge1, anEdge2)) {
+ // Make the first edge last.
+ anEdges.Append(anEdge2);
+ anEdges.RemoveFirst();
+ aCurVertices.Append(aCurVertices.First());
+ aCurVertices.RemoveFirst();
+
+ // Check if we reached the first edge again.
+ // Break the loop in this case.
+ isShift = !aFirstEdge.IsSame(anEdges.First());
+ }
+ }
+ }
+ }
+
+ TopTools_ListOfShape finalList, currChain;
+ TopTools_ListIteratorOfListOfShape anEIter(anEdges);
+ TopTools_ListIteratorOfListOfShape aVIter(aCurVertices);
+ TopoDS_Edge prevEdge = TopoDS::Edge(anEIter.Value());
+
+ currChain.Append(prevEdge);
+ anEIter.Next();
+ aVIter.Next();
+
+ for (; anEIter.More(); anEIter.Next(), aVIter.Next()) {
+ TopoDS_Edge anEdge = TopoDS::Edge(anEIter.Value());
+ const TopoDS_Shape &aCurVertex = aVIter.Value();