X-Git-Url: http://git.salome-platform.org/gitweb/?a=blobdiff_plain;f=src%2FGeomAlgoAPI%2FGeomAlgoAPI_ShapeTools.cpp;h=a47c77c7f28d1fa298a72a1613b71a5eabdd06ff;hb=5fb6a80c4e86e21b1181b4e6ee940d946b5c52e4;hp=bf7c58b550a2eaa6ff5bb9c19ea5c50f24055093;hpb=7074394f8f08413d885f63be01df6bd5007b868c;p=modules%2Fshaper.git

diff --git a/src/GeomAlgoAPI/GeomAlgoAPI_ShapeTools.cpp b/src/GeomAlgoAPI/GeomAlgoAPI_ShapeTools.cpp
index bf7c58b55..a47c77c7f 100644
--- a/src/GeomAlgoAPI/GeomAlgoAPI_ShapeTools.cpp
+++ b/src/GeomAlgoAPI/GeomAlgoAPI_ShapeTools.cpp
@@ -28,11 +28,12 @@
 #include <GeomAPI_Face.h>
 #include <GeomAPI_Pln.h>
 #include <GeomAPI_Pnt.h>
+#include <GeomAPI_Wire.h>
 
 #include <Bnd_Box.hxx>
-#include <BOPTools.hxx>
 #include <BRep_Builder.hxx>
 #include <BRepAdaptor_Curve.hxx>
+#include <BRepAlgo.hxx>
 #include <BRepAlgo_FaceRestrictor.hxx>
 #include <BRepBndLib.hxx>
 #include <BRepBuilderAPI_FindPlane.hxx>
@@ -43,16 +44,21 @@
 #include <BRepExtrema_ExtCF.hxx>
 #include <BRepGProp.hxx>
 #include <BRepTools.hxx>
+#include <BRepTools_WireExplorer.hxx>
 #include <BRepTopAdaptor_FClass2d.hxx>
+#include <BRepClass_FaceClassifier.hxx>
 #include <Geom2d_Curve.hxx>
 #include <Geom2d_Curve.hxx>
 #include <BRepLib_CheckCurveOnSurface.hxx>
 #include <BRep_Tool.hxx>
+#include  <Geom_CylindricalSurface.hxx>
 #include <Geom_Line.hxx>
 #include <Geom_Plane.hxx>
 #include <GeomAPI_ProjectPointOnCurve.hxx>
+#include <GeomAPI_ShapeIterator.h>
 #include <GeomLib_IsPlanarSurface.hxx>
 #include <GeomLib_Tool.hxx>
+#include <GeomAPI_IntCS.hxx>
 #include <gp_Pln.hxx>
 #include <GProp_GProps.hxx>
 #include <IntAna_IntConicQuad.hxx>
@@ -67,13 +73,44 @@
 #include <TopoDS_Shell.hxx>
 #include <TopoDS_Vertex.hxx>
 #include <TopoDS.hxx>
+#include <TopExp.hxx>
 #include <TopExp_Explorer.hxx>
 #include <TopTools_ListIteratorOfListOfShape.hxx>
 
+
 #include <BOPAlgo_Builder.hxx>
 #include <BRepBuilderAPI_MakeVertex.hxx>
 #include <TopoDS_Edge.hxx>
 
+//==================================================================================================
+static GProp_GProps props(const TopoDS_Shape& theShape)
+{
+  GProp_GProps aGProps;
+
+  if (theShape.ShapeType() == TopAbs_EDGE || theShape.ShapeType() == TopAbs_WIRE)
+  {
+    BRepGProp::LinearProperties(theShape, aGProps);
+  }
+  else if (theShape.ShapeType() == TopAbs_FACE || theShape.ShapeType() == TopAbs_SHELL)
+  {
+    const Standard_Real anEps = 1.e-6;
+    BRepGProp::SurfaceProperties(theShape, aGProps, anEps);
+  }
+  else if (theShape.ShapeType() == TopAbs_SOLID || theShape.ShapeType() == TopAbs_COMPSOLID)
+  {
+    BRepGProp::VolumeProperties(theShape, aGProps);
+  }
+  else if (theShape.ShapeType() == TopAbs_COMPOUND)
+  {
+    for (TopoDS_Iterator anIt(theShape); anIt.More(); anIt.Next())
+    {
+      aGProps.Add(props(anIt.Value()));
+    }
+  }
+
+  return aGProps;
+}
+
 //==================================================================================================
 double GeomAlgoAPI_ShapeTools::volume(const std::shared_ptr<GeomAPI_Shape> theShape)
 {
@@ -86,7 +123,27 @@ double GeomAlgoAPI_ShapeTools::volume(const std::shared_ptr<GeomAPI_Shape> theSh
     return 0.0;
   }
   const Standard_Real anEps = 1.e-6;
-  BRepGProp::VolumeProperties(aShape, aGProps, anEps);
+  if (aShape.ShapeType() <= TopAbs_SOLID)
+    BRepGProp::VolumeProperties(aShape, aGProps, anEps);
+  else
+    BRepGProp::SurfaceProperties(aShape, aGProps, anEps);
+  return aGProps.Mass();
+}
+
+//==================================================================================================
+double GeomAlgoAPI_ShapeTools::area (const std::shared_ptr<GeomAPI_Shape> theShape)
+{
+  GProp_GProps aGProps;
+  if(!theShape.get()) {
+    return 0.0;
+  }
+  const TopoDS_Shape& aShape = theShape->impl<TopoDS_Shape>();
+  if(aShape.IsNull()) {
+    return 0.0;
+  }
+  const Standard_Real anEps = 1.e-6;
+
+  BRepGProp::SurfaceProperties(aShape, aGProps, anEps);
   return aGProps.Mass();
 }
 
@@ -105,16 +162,40 @@ std::shared_ptr<GeomAPI_Pnt>
   gp_Pnt aCentre;
   if(aShape.ShapeType() == TopAbs_VERTEX) {
     aCentre = BRep_Tool::Pnt(TopoDS::Vertex(aShape));
-  } else if(aShape.ShapeType() == TopAbs_EDGE || aShape.ShapeType() == TopAbs_WIRE) {
-    BRepGProp::LinearProperties(aShape, aGProps);
-    aCentre = aGProps.CentreOfMass();
   } else {
-    BRepGProp::SurfaceProperties(aShape, aGProps);
+    aGProps = props(aShape);
     aCentre = aGProps.CentreOfMass();
   }
+
   return std::shared_ptr<GeomAPI_Pnt>(new GeomAPI_Pnt(aCentre.X(), aCentre.Y(), aCentre.Z()));
 }
 
+//==================================================================================================
+double GeomAlgoAPI_ShapeTools::radius(const std::shared_ptr<GeomAPI_Face>& theCylinder)
+{
+  double aRadius = -1.0;
+  if (theCylinder->isCylindrical()) {
+    const TopoDS_Shape& aShape = theCylinder->impl<TopoDS_Shape>();
+    Handle(Geom_Surface) aSurf = BRep_Tool::Surface(TopoDS::Face(aShape));
+    Handle(Geom_CylindricalSurface) aCyl = Handle(Geom_CylindricalSurface)::DownCast(aSurf);
+    if (!aCyl.IsNull())
+      aRadius = aCyl->Radius();
+  }
+  return aRadius;
+}
+
+//==================================================================================================
+double GeomAlgoAPI_ShapeTools::minimalDistance(const GeomShapePtr& theShape1,
+                                               const GeomShapePtr& theShape2)
+{
+  const TopoDS_Shape& aShape1 = theShape1->impl<TopoDS_Shape>();
+  const TopoDS_Shape& aShape2 = theShape2->impl<TopoDS_Shape>();
+
+  BRepExtrema_DistShapeShape aDist(aShape1, aShape2);
+  aDist.Perform();
+  return aDist.IsDone() ? aDist.Value() : Precision::Infinite();
+}
+
 //==================================================================================================
 std::shared_ptr<GeomAPI_Shape> GeomAlgoAPI_ShapeTools::combineShapes(
   const std::shared_ptr<GeomAPI_Shape> theCompound,
@@ -154,8 +235,8 @@ std::shared_ptr<GeomAPI_Shape> GeomAlgoAPI_ShapeTools::combineShapes(
   }
 
   // Map subshapes and shapes.
-  BOPCol_IndexedDataMapOfShapeListOfShape aMapSA;
-  BOPTools::MapShapesAndAncestors(aShapesComp, aTS, aTA, aMapSA);
+  TopTools_IndexedDataMapOfShapeListOfShape aMapSA;
+  TopExp::MapShapesAndAncestors(aShapesComp, aTS, aTA, aMapSA);
   if(aMapSA.IsEmpty()) {
     return aResult;
   }
@@ -163,10 +244,10 @@ std::shared_ptr<GeomAPI_Shape> GeomAlgoAPI_ShapeTools::combineShapes(
   // Get all shapes with common subshapes and free shapes.
   NCollection_Map<TopoDS_Shape> aFreeShapes;
   NCollection_Vector<NCollection_Map<TopoDS_Shape>> aShapesWithCommonSubshapes;
-  for(BOPCol_IndexedDataMapOfShapeListOfShape::Iterator
+  for(TopTools_IndexedDataMapOfShapeListOfShape::Iterator
       anIter(aMapSA); anIter.More(); anIter.Next()) {
     const TopoDS_Shape& aShape = anIter.Key();
-    BOPCol_ListOfShape& aListOfShape = anIter.ChangeValue();
+    TopTools_ListOfShape& aListOfShape = anIter.ChangeValue();
     if(aListOfShape.IsEmpty()) {
       continue;
     }
@@ -177,40 +258,39 @@ std::shared_ptr<GeomAPI_Shape> GeomAlgoAPI_ShapeTools::combineShapes(
     } else {
       NCollection_List<TopoDS_Shape> aTempList;
       NCollection_Map<TopoDS_Shape> aTempMap;
-      const TopoDS_Shape& aF = aListOfShape.First();
-      const TopoDS_Shape& aL = aListOfShape.Last();
-      aTempList.Append(aF);
-      aTempList.Append(aL);
-      aTempMap.Add(aF);
-      aTempMap.Add(aL);
-      aFreeShapes.Remove(aF);
-      aFreeShapes.Remove(aL);
+      for (TopTools_ListOfShape::Iterator aListIt(aListOfShape); aListIt.More(); aListIt.Next()) {
+        aTempList.Append(aListIt.Value());
+        aTempMap.Add(aListIt.Value());
+        aFreeShapes.Remove(aListIt.Value());
+      }
       aListOfShape.Clear();
       for(NCollection_List<TopoDS_Shape>::Iterator
           aTempIter(aTempList); aTempIter.More(); aTempIter.Next()) {
         const TopoDS_Shape& aTempShape = aTempIter.Value();
-        for(BOPCol_IndexedDataMapOfShapeListOfShape::Iterator
+        for(TopTools_IndexedDataMapOfShapeListOfShape::Iterator
             anIter(aMapSA); anIter.More(); anIter.Next()) {
-          BOPCol_ListOfShape& aTempListOfShape = anIter.ChangeValue();
+          TopTools_ListOfShape& aTempListOfShape = anIter.ChangeValue();
           if(aTempListOfShape.IsEmpty()) {
             continue;
           } else if(aTempListOfShape.Size() == 1 && aTempListOfShape.First() == aTempShape) {
             aTempListOfShape.Clear();
           } else if(aTempListOfShape.Size() > 1) {
-            if(aTempListOfShape.First() == aTempShape) {
-              const TopoDS_Shape& aTL = aTempListOfShape.Last();
-              if(aTempMap.Add(aTL)) {
-                aTempList.Append(aTL);
-                aFreeShapes.Remove(aTL);
-              }
-              aTempListOfShape.Clear();
-            } else if(aTempListOfShape.Last() == aTempShape) {
-              const TopoDS_Shape& aTF = aTempListOfShape.First();
-              if(aTempMap.Add(aTF)) {
-                aTempList.Append(aTF);
-                aFreeShapes.Remove(aTF);
+            TopTools_ListOfShape::Iterator anIt1(aTempListOfShape);
+            for (; anIt1.More(); anIt1.Next()) {
+              if (anIt1.Value() == aTempShape) {
+                TopTools_ListOfShape::Iterator anIt2(aTempListOfShape);
+                for (; anIt2.More(); anIt2.Next())
+                {
+                  if (anIt2.Value() != anIt1.Value()) {
+                    if (aTempMap.Add(anIt2.Value())) {
+                      aTempList.Append(anIt2.Value());
+                      aFreeShapes.Remove(anIt2.Value());
+                    }
+                  }
+                }
+                aTempListOfShape.Clear();
+                break;
               }
-              aTempListOfShape.Clear();
             }
           }
         }
@@ -313,7 +393,7 @@ std::shared_ptr<GeomAPI_Shape> GeomAlgoAPI_ShapeTools::groupSharedTopology(
 {
   GeomShapePtr aResult = theCompound;
 
-  if(!theCompound.get()) {
+  if (!theCompound.get()) {
     return aResult;
   }
 
@@ -321,63 +401,108 @@ std::shared_ptr<GeomAPI_Shape> GeomAlgoAPI_ShapeTools::groupSharedTopology(
   NCollection_List<TopoDS_Shape> anUngroupedShapes, aStillUngroupedShapes;
   addSimpleShapeToList(anInShape, anUngroupedShapes);
 
-  NCollection_Vector<NCollection_List<TopoDS_Shape>> aGroups;
-  while(!anUngroupedShapes.IsEmpty()) {
-    NCollection_List<TopoDS_Shape> aGroupedShapes;
-    aGroupedShapes.Append(anUngroupedShapes.First());
-    anUngroupedShapes.RemoveFirst();
-    for(NCollection_List<TopoDS_Shape>::Iterator aGroupIt(aGroupedShapes);
-        aGroupIt.More(); aGroupIt.Next()) {
-      const TopoDS_Shape& aGroupedShape = aGroupIt.Value();
-      for(TopExp_Explorer aGroupShapeExp(aGroupedShape, TopAbs_VERTEX);
-          aGroupShapeExp.More();
-          aGroupShapeExp.Next()) {
-        // Find all shapes which have same vertex.
-        aStillUngroupedShapes.Clear();
-        const TopoDS_Shape& aVertex1 = aGroupShapeExp.Current();
-        for(NCollection_List<TopoDS_Shape>::Iterator anUngroupedIt(anUngroupedShapes);
-            anUngroupedIt.More();
-            anUngroupedIt.Next()) {
-          const TopoDS_Shape& anUngroupedShape = anUngroupedIt.Value();
-          bool isAdded = false;
-          for(TopExp_Explorer anUgroupedShapeExp(anUngroupedShape, TopAbs_VERTEX);
-              anUgroupedShapeExp.More();
-              anUgroupedShapeExp.Next()) {
-            const TopoDS_Shape& aVertex2 = anUgroupedShapeExp.Current();
-            if(aVertex1.IsSame(aVertex2)) {
-              aGroupedShapes.Append(anUngroupedShape);
-              isAdded = true;
-              break;
-            }
-          }
-          if(!isAdded) {
-            aStillUngroupedShapes.Append(anUngroupedShape);
-          }
+  // Iterate over all shapes and find shapes with shared vertices.
+  TopTools_ListOfShape allVertices;
+  TopTools_DataMapOfShapeListOfShape aVertexShapesMap;
+  for (NCollection_List<TopoDS_Shape>::Iterator aShapesIt(anUngroupedShapes);
+    aShapesIt.More();
+    aShapesIt.Next()) {
+    const TopoDS_Shape& aShape = aShapesIt.Value();
+    for (TopExp_Explorer aShapeExp(aShape, TopAbs_VERTEX);
+      aShapeExp.More();
+      aShapeExp.Next()) {
+      const TopoDS_Shape& aVertex = aShapeExp.Current();
+      if (!aVertexShapesMap.IsBound(aVertex)) {
+        NCollection_List<TopoDS_Shape> aList;
+        aList.Append(aShape);
+        allVertices.Append(aVertex);
+        aVertexShapesMap.Bind(aVertex, aList);
+      }
+      else {
+        if (!aVertexShapesMap.ChangeFind(aVertex).Contains(aShape)) {
+          aVertexShapesMap.ChangeFind(aVertex).Append(aShape);
+        }
+      }
+    }
+  }
+
+  // Iterate over the map and group shapes.
+  NCollection_Vector<TopTools_MapOfShape> aGroups; // groups of shapes connected by vertices
+  while (!allVertices.IsEmpty()) {
+    // Get first group of shapes in map, and then unbind it.
+    const TopoDS_Shape& aKey = allVertices.First();
+    TopTools_ListOfShape aConnectedShapes = aVertexShapesMap.Find(aKey);
+    aVertexShapesMap.UnBind(aKey);
+    allVertices.Remove(aKey);
+    // Iterate over shapes in this group and add to it shapes from groups in map.
+    for (TopTools_ListOfShape::Iterator aConnectedIt(aConnectedShapes);
+      aConnectedIt.More(); aConnectedIt.Next()) {
+      const TopoDS_Shape& aConnected = aConnectedIt.Value();
+      TopTools_ListOfShape aKeysToUnbind;
+      for (TopTools_ListOfShape::Iterator aKeysIt(allVertices);
+        aKeysIt.More();
+        aKeysIt.Next()) {
+        const TopTools_ListOfShape& anOtherConnected = aVertexShapesMap(aKeysIt.Value());
+        if (!anOtherConnected.Contains(aConnected)) {
+          // Other connected group does not containt shape from our connected group
+          continue;
         }
-        anUngroupedShapes = aStillUngroupedShapes;
-        if(anUngroupedShapes.IsEmpty()) {
-          break;
+        // Other is connected to our, so add them to our connected
+        for (TopTools_ListOfShape::Iterator anOtherIt(anOtherConnected);
+          anOtherIt.More();
+          anOtherIt.Next()) {
+          const TopoDS_Shape& aShape = anOtherIt.Value();
+          if (!aConnectedShapes.Contains(aShape)) {
+            aConnectedShapes.Append(aShape);
+          }
         }
+        // Save key to unbind from this map.
+        aKeysToUnbind.Append(aKeysIt.Value());
+      }
+      // Unbind groups from map that we added to our group.
+      for (TopTools_ListOfShape::Iterator aKeysIt(aKeysToUnbind);
+        aKeysIt.More();
+        aKeysIt.Next()) {
+        aVertexShapesMap.UnBind(aKeysIt.Value());
+        allVertices.Remove(aKeysIt.Value());
       }
-      if(anUngroupedShapes.IsEmpty()) {
-        break;
+    }
+    // Sort shapes from the most complicated to the simplest ones
+    TopTools_MapOfShape aSortedGroup;
+    for (int aST = TopAbs_COMPOUND; aST <= TopAbs_SHAPE; ++aST) {
+      TopTools_ListOfShape::Iterator anIt(aConnectedShapes);
+      while (anIt.More()) {
+        if (anIt.Value().ShapeType() == aST) {
+          aSortedGroup.Add(anIt.Value());
+          aConnectedShapes.Remove(anIt);
+        }
+        else {
+          anIt.Next();
+        }
       }
     }
-    aGroups.Append(aGroupedShapes);
+    aGroups.Append(aSortedGroup);
   }
 
   TopoDS_Compound aCompound;
   BRep_Builder aBuilder;
   aBuilder.MakeCompound(aCompound);
   ListOfShape aCompSolids, aFreeSolids;
-  for(NCollection_Vector<NCollection_List<TopoDS_Shape>>::Iterator
-      anIt(aGroups); anIt.More(); anIt.Next()) {
-    NCollection_List<TopoDS_Shape> aGroup = anIt.Value();
+  for (NCollection_Vector<TopTools_MapOfShape>::Iterator anIt(aGroups); anIt.More(); anIt.Next()) {
+    const TopTools_MapOfShape& aGroup = anIt.ChangeValue();
     GeomShapePtr aGeomShape(new GeomAPI_Shape());
     if(aGroup.Size() == 1) {
-      aGeomShape->setImpl(new TopoDS_Shape(aGroup.First()));
+      TopTools_MapOfShape::Iterator aOneShapeIter(aGroup);
+      aGeomShape->setImpl(new TopoDS_Shape(aOneShapeIter.Value()));
     } else {
-      aGeomShape->setImpl(new TopoDS_Shape(makeCompound(aGroup)));
+      // make sub-shapes in the group have order same as in original shape
+      TopTools_ListOfShape anOrderedGoup;
+      NCollection_List<TopoDS_Shape>::Iterator anUngrouped(anUngroupedShapes);
+      for (; anUngrouped.More(); anUngrouped.Next()) {
+        if (aGroup.Contains(anUngrouped.Value()))
+          anOrderedGoup.Append(anUngrouped.Value());
+      }
+      aGeomShape->setImpl(new TopoDS_Shape(makeCompound(anOrderedGoup)));
       aGeomShape = GeomAlgoAPI_ShapeTools::combineShapes(aGeomShape,
                                                          GeomAPI_Shape::COMPSOLID,
                                                          aCompSolids,
@@ -710,6 +835,41 @@ bool GeomAlgoAPI_ShapeTools::isParallel(const std::shared_ptr<GeomAPI_Edge> theE
   return anExt.IsParallel() == Standard_True;
 }
 
+//==================================================================================================
+std::list<std::shared_ptr<GeomAPI_Vertex> > GeomAlgoAPI_ShapeTools::intersect(
+  const std::shared_ptr<GeomAPI_Edge> theEdge, const std::shared_ptr<GeomAPI_Face> theFace,
+  const bool thePointsOutsideFace)
+{
+  std::list<std::shared_ptr<GeomAPI_Vertex> > aResult;
+  if(!theEdge.get() || !theFace.get()) {
+    return aResult;
+  }
+
+  TopoDS_Edge anEdge = TopoDS::Edge(theEdge->impl<TopoDS_Shape>());
+  double aFirstOnCurve, aLastOnCurve;
+  Handle(Geom_Curve) aCurve = BRep_Tool::Curve(anEdge, aFirstOnCurve, aLastOnCurve);
+
+  TopoDS_Face aFace  = TopoDS::Face(theFace->impl<TopoDS_Shape>());
+  Handle(Geom_Surface) aSurf = BRep_Tool::Surface(aFace);
+
+  GeomAPI_IntCS anIntAlgo(aCurve, aSurf);
+  if (!anIntAlgo.IsDone())
+    return aResult;
+  // searching for points-intersection
+  for(int anIntNum = 1; anIntNum <= anIntAlgo.NbPoints() + anIntAlgo.NbSegments(); anIntNum++) {
+    gp_Pnt anInt;
+    if (anIntNum <= anIntAlgo.NbPoints()) {
+      anInt = anIntAlgo.Point(anIntNum);
+    } else { // take the middle point on the segment of the intersection
+      Handle(Geom_Curve) anIntCurve = anIntAlgo.Segment(anIntNum - anIntAlgo.NbPoints());
+      anIntCurve->D0((anIntCurve->FirstParameter() + anIntCurve->LastParameter()) / 2., anInt);
+    }
+    aResult.push_back(std::shared_ptr<GeomAPI_Vertex>(
+      new GeomAPI_Vertex(anInt.X(), anInt.Y(), anInt.Z())));
+  }
+  return aResult;
+}
+
 //==================================================================================================
 void GeomAlgoAPI_ShapeTools::splitShape(const std::shared_ptr<GeomAPI_Shape>& theBaseShape,
                                       const GeomAlgoAPI_ShapeTools::PointToRefsMap& thePointsInfo,
@@ -747,7 +907,7 @@ void GeomAlgoAPI_ShapeTools::splitShape(const std::shared_ptr<GeomAPI_Shape>& th
   }
 
   aBOP.Perform();
-  if (aBOP.ErrorStatus())
+  if (aBOP.HasErrors())
     return;
 
   // Collect splits
@@ -792,7 +952,7 @@ void GeomAlgoAPI_ShapeTools::splitShape_p(const std::shared_ptr<GeomAPI_Shape>&
   }
 
   aBOP.Perform();
-  if (aBOP.ErrorStatus())
+  if (aBOP.HasErrors())
     return;
 
   // Collect splits
@@ -851,4 +1011,79 @@ std::shared_ptr<GeomAPI_Dir> GeomAlgoAPI_ShapeTools::buildDirFromAxisAndShape(
                                                     aCentreOfMassPoint.Y()-aPoint.Y(),
                                                     aCentreOfMassPoint.Z()-aPoint.Z()));
   return aDir;
+}
+
+//==================================================================================================
+static TopoDS_Wire fixParametricGaps(const TopoDS_Wire& theWire)
+{
+  TopoDS_Wire aFixedWire;
+  Handle(Geom_Curve) aPrevCurve;
+  double aPrevLastParam = 0.0;
+
+  BRep_Builder aBuilder;
+  aBuilder.MakeWire(aFixedWire);
+
+  BRepTools_WireExplorer aWExp(theWire);
+  for (; aWExp.More(); aWExp.Next()) {
+    TopoDS_Edge anEdge = aWExp.Current();
+    double aFirst, aLast;
+    Handle(Geom_Curve) aCurve = BRep_Tool::Curve(anEdge, aFirst, aLast);
+    if (aCurve == aPrevCurve) {
+      // if parametric gap occurs, create new edge based on the copied curve
+      aCurve = Handle(Geom_Curve)::DownCast(aCurve->Copy());
+      TopoDS_Vertex aV1, aV2;
+      TopExp::Vertices(anEdge, aV1, aV2);
+      anEdge = TopoDS::Edge(anEdge.EmptyCopied());
+      aBuilder.UpdateEdge(anEdge, aCurve, BRep_Tool::Tolerance(anEdge));
+      aBuilder.Add(anEdge, aV1);
+      aBuilder.Add(anEdge, aV2);
+    }
+
+    aBuilder.Add(aFixedWire, anEdge);
+
+    aPrevCurve = aCurve;
+    aPrevLastParam = aLast;
+  }
+
+  return aFixedWire;
+}
+
+std::shared_ptr<GeomAPI_Edge> GeomAlgoAPI_ShapeTools::wireToEdge(
+      const std::shared_ptr<GeomAPI_Wire>& theWire)
+{
+  GeomEdgePtr anEdge;
+  if (theWire) {
+    TopoDS_Wire aWire = theWire->impl<TopoDS_Wire>();
+    // Workaround: when concatenate a wire consisting of two edges based on the same B-spline curve
+    // (non-periodic, but having equal start and end points), first of which is placed at the end
+    // on the curve and second is placed at the start, this workaround copies second curve to avoid
+    // treating these edges as a single curve by setting trim parameters.
+    aWire = fixParametricGaps(aWire);
+    TopoDS_Edge aNewEdge = BRepAlgo::ConcatenateWireC0(aWire);
+    anEdge = GeomEdgePtr(new GeomAPI_Edge);
+    anEdge->setImpl(new TopoDS_Edge(aNewEdge));
+  }
+  return anEdge;
+}
+
+ListOfShape GeomAlgoAPI_ShapeTools::getLowLevelSubShapes(const GeomShapePtr& theShape)
+{
+  ListOfShape aSubShapes;
+
+  if (!theShape->isCompound() && !theShape->isCompSolid() &&
+      !theShape->isShell() && !theShape->isWire()) {
+    return aSubShapes;
+  }
+
+  for (GeomAPI_ShapeIterator anIt(theShape); anIt.more(); anIt.next()) {
+    GeomShapePtr aSubShape = anIt.current();
+    if (aSubShape->isVertex() || aSubShape->isEdge() ||
+        aSubShape->isFace() || aSubShape->isSolid()) {
+      aSubShapes.push_back(aSubShape);
+    } else {
+      aSubShapes.splice(aSubShapes.end(), getLowLevelSubShapes(aSubShape));
+    }
+  }
+
+  return aSubShapes;
 }
\ No newline at end of file