From f177d54444d1a248e4f724469682173c6b266399 Mon Sep 17 00:00:00 2001
From: abk <abk@opencascade.com>
Date: Mon, 29 Jun 2015 16:18:57 +0300
Subject: [PATCH] Algorithms to cut any closed section at any point were
 written.

---
 src/HYDROData/HYDROData_PolylineOperator.cxx | 36 ++++++++++++++++----
 1 file changed, 30 insertions(+), 6 deletions(-)

diff --git a/src/HYDROData/HYDROData_PolylineOperator.cxx b/src/HYDROData/HYDROData_PolylineOperator.cxx
index 6f8ef42a..f95789d6 100644
--- a/src/HYDROData/HYDROData_PolylineOperator.cxx
+++ b/src/HYDROData/HYDROData_PolylineOperator.cxx
@@ -417,6 +417,24 @@ static void CollectCurveWire(
   }
 }
 
+static void CollectCurveWire(
+  const NCollection_Vector<TopoDS_Edge>& theEdges1,
+  const NCollection_Vector<TopoDS_Edge>& theEdges2,
+  TopoDS_Wire& theWire)
+{
+  BRep_Builder aBulder;
+  aBulder.MakeWire(theWire);
+  const NCollection_Vector<TopoDS_Edge>* aEdges[] = {&theEdges1, &theEdges2};
+  for (Standard_Integer aEI = 0; aEI < 2; ++aEI)
+  {
+    NCollection_Vector<TopoDS_Edge>::Iterator aEIt(*aEdges[aEI]);
+    for (; aEIt.More(); aEIt.Next())
+    {
+      aBulder.Add(theWire, aEIt.Value());
+    }
+  }
+}
+
 std::vector<TopoDS_Shape> HYDROData_PolylineOperator::Split( const TopoDS_Wire& theWire,
                                                              const gp_Pnt2d& thePoint,
                                                              double theTolerance )
@@ -450,14 +468,20 @@ std::vector<TopoDS_Shape> HYDROData_PolylineOperator::Split( const TopoDS_Wire&
   NCollection_Vector<TopoDS_Edge> aEdges1, aEdges2;
   SplitCurveByPoint(aEdges, aSEI, aSParam, aEdges1, aEdges2);
   TopoDS_Wire aWire;
-  CollectCurveWire(aEdges1, aWire);
-  aResult.push_back(aWire);
-  if (!aEdges2.IsEmpty())
+  if (!isClosed)
   {
-    CollectCurveWire(aEdges2, aWire);
-    aResult.push_back(aWire);
+    CollectCurveWire(aEdges1, aWire);
+    if (!aEdges2.IsEmpty())
+    {
+      aResult.push_back(aWire);
+      CollectCurveWire(aEdges2, aWire);
+    }
   }
-
+  else
+  {
+    CollectCurveWire(aEdges2, aEdges1, aWire);
+  }
+  aResult.push_back(aWire);
   return aResult;
 }
 
-- 
2.39.2