OCCT

// Created on: 1995-04-25
// Created by: Marie Jose MARTZ
// Copyright (c) 1995-1999 Matra Datavision
// Copyright (c) 1999-2014 OPEN CASCADE SAS
//
// This file is part of Open CASCADE Technology software library.
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License version 2.1 as published
// by the Free Software Foundation, with special exception defined in the file
// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
// distribution for complete text of the license and disclaimer of any warranty.
//
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.

// modif le 25/03/96 mjm
// implement ShapeCustom::DirectModification for indirect surfaces (out of norm IGES)
//: l4 abv 12 Jan 99: CTS22022-2: correct writing reversed shells
//: n3 abv 8 Feb 99: PRO17820: BRepTools::OuterWire() -> ShapeAnalysis::OuterWire
// szv#4 S4163
// S4181 pdn 20.04.99 implementing of writing IGES elementary surfaces.
//       abv 31.01.00 inheriting from BRepToIGES_BREntity to remove code duplication
// eap: Tue Aug 29 11:02:56 2000: Shape Processing moved to upper levels

#include <BRep_Tool.hxx>
#include <BRepLib.hxx>
#include <BRepToIGES_BRWire.hxx>
#include <BRepToIGESBRep_Entity.hxx>
#include <BRepTools.hxx>
#include <BRepTools_WireExplorer.hxx>
#include <Geom_BezierCurve.hxx>
#include <Geom_RectangularTrimmedSurface.hxx>
#include <Geom_Surface.hxx>
#include <GeomToIGES_GeomSurface.hxx>
#include <gp_Pnt.hxx>
#include <gp_XYZ.hxx>
#include <IGESBasic_Group.hxx>
#include <IGESBasic_HArray1OfHArray1OfIGESEntity.hxx>
#include <IGESBasic_HArray1OfHArray1OfInteger.hxx>
#include <IGESData_HArray1OfIGESEntity.hxx>
#include <IGESData_IGESEntity.hxx>
#include <IGESSolid_EdgeList.hxx>
#include <IGESSolid_HArray1OfVertexList.hxx>
#include <IGESSolid_Loop.hxx>
#include <IGESSolid_ManifoldSolid.hxx>
#include <IGESSolid_Shell.hxx>
#include <IGESSolid_VertexList.hxx>
#include <Interface_Macros.hxx>
#include <Interface_Static.hxx>
#include <Message_ProgressScope.hxx>
#include <ShapeAlgo.hxx>
#include <ShapeAlgo_AlgoContainer.hxx>
#include <TColgp_HArray1OfXYZ.hxx>
#include <TColStd_HArray1OfInteger.hxx>
#include <TColStd_HSequenceOfTransient.hxx>
#include <TColStd_SequenceOfInteger.hxx>
#include <TopAbs_Orientation.hxx>
#include <TopAbs_ShapeEnum.hxx>
#include <TopExp.hxx>
#include <TopExp_Explorer.hxx>
#include <TopoDS.hxx>
#include <TopoDS_Compound.hxx>
#include <TopoDS_CompSolid.hxx>
#include <TopoDS_Edge.hxx>
#include <TopoDS_Face.hxx>
#include <TopoDS_Shape.hxx>
#include <TopoDS_Shell.hxx>
#include <TopoDS_Solid.hxx>
#include <TopoDS_Vertex.hxx>
#include <TopoDS_Wire.hxx>
#include <Transfer_FinderProcess.hxx>

// #include <GeomConvert.hxx>
// #include <Geom2dConvert.hxx>
// #include <ShapeAnalysis.hxx>
// #include <ShapeCustom.hxx>
//=================================================================================================

BRepToIGESBRep_Entity::BRepToIGESBRep_Entity()
{
  Init();
  if (myEdgeList.IsNull())
    myEdgeList = new IGESSolid_EdgeList;
  if (myVertexList.IsNull())
    myVertexList = new IGESSolid_VertexList;
}

//=================================================================================================

void BRepToIGESBRep_Entity::Clear()
{
  myVertices.Clear();
  myEdges.Clear();
  myCurves.Clear();
}

//=============================================================================
// TransferVertexList
//
//=============================================================================

void BRepToIGESBRep_Entity::TransferVertexList()
{

  Standard_Integer nbvertices = myVertices.Extent();
  if (!nbvertices)
    return;
  Handle(TColgp_HArray1OfXYZ) vertices = new TColgp_HArray1OfXYZ(1, nbvertices);
  Standard_Real               Unit     = GetUnit();
  Standard_Real               X, Y, Z;

  for (Standard_Integer ivertex = 1; ivertex <= nbvertices; ivertex++)
  {
    TopoDS_Shape  myshape  = myVertices(ivertex);
    TopoDS_Vertex myvertex = TopoDS::Vertex(myshape);
    gp_Pnt        Point    = BRep_Tool::Pnt(myvertex);
    Point.Coord(X, Y, Z);
    vertices->SetValue(ivertex, gp_XYZ(X / Unit, Y / Unit, Z / Unit));
  }

  myVertexList->Init(vertices);
}

//=============================================================================
// IndexVertex
//=============================================================================
Standard_Integer BRepToIGESBRep_Entity::IndexVertex(const TopoDS_Vertex& myvertex) const
{
  const TopoDS_Shape& V = myvertex;
  return myVertices.FindIndex(V);
}

//=============================================================================
// AddVertex
//
//=============================================================================

Standard_Integer BRepToIGESBRep_Entity::AddVertex(const TopoDS_Vertex& myvertex)
{
  if (myvertex.IsNull())
    return 0;

  const TopoDS_Shape& V     = myvertex;
  Standard_Integer    index = myVertices.FindIndex(V);
  if (index == 0)
  {
    index = myVertices.Add(V);
  }

  return index;
}

//=============================================================================
// TransferEdgeList
//
//=============================================================================

void BRepToIGESBRep_Entity::TransferEdgeList()
{

  Handle(IGESSolid_VertexList) TheVertexList = myVertexList;

  Handle(IGESData_IGESEntity)  mycurve;
  Standard_Integer             mystartindex, myendindex;
  Handle(IGESSolid_VertexList) mystartlist;
  Handle(IGESSolid_VertexList) myendlist;

  Standard_Integer nbedges = myEdges.Extent();
  if (!nbedges)
    return;
  Handle(IGESData_HArray1OfIGESEntity)  Curves = new IGESData_HArray1OfIGESEntity(1, nbedges);
  Handle(IGESSolid_HArray1OfVertexList) startVertexList =
    new IGESSolid_HArray1OfVertexList(1, nbedges);
  Handle(TColStd_HArray1OfInteger)      startVertexIndex = new TColStd_HArray1OfInteger(1, nbedges);
  Handle(IGESSolid_HArray1OfVertexList) endVertexList =
    new IGESSolid_HArray1OfVertexList(1, nbedges);
  Handle(TColStd_HArray1OfInteger) endVertexIndex = new TColStd_HArray1OfInteger(1, nbedges);

  for (Standard_Integer iedge = 1; iedge <= nbedges; iedge++)
  {
    TopoDS_Shape myshape = myEdges(iedge);
    TopoDS_Edge  myedge  = TopoDS::Edge(myshape);
    //  the curve 3D
    DeclareAndCast(IGESData_IGESEntity, amycurve, myCurves(iedge));
    Curves->SetValue(iedge, amycurve);
    TopoDS_Vertex V1, V2;
    TopExp::Vertices(myedge, V1, V2);
    //  vertices follow the orientation of curve 3d
    mystartindex = IndexVertex(V1);
    myendindex   = IndexVertex(V2);
    startVertexIndex->SetValue(iedge, mystartindex);
    endVertexIndex->SetValue(iedge, myendindex);
    startVertexList->SetValue(iedge, TheVertexList);
    endVertexList->SetValue(iedge, TheVertexList);
  }

  myEdgeList->Init(Curves, startVertexList, startVertexIndex, endVertexList, endVertexIndex);
}

//=============================================================================
// IndexEdge
//=============================================================================
Standard_Integer BRepToIGESBRep_Entity::IndexEdge(const TopoDS_Edge& myedge) const
{
  const TopoDS_Shape& E = myedge;
  return myEdges.FindIndex(E);
}

//=============================================================================
// AddEdge
//
//=============================================================================

Standard_Integer BRepToIGESBRep_Entity::AddEdge(const TopoDS_Edge&                 myedge,
                                                const Handle(IGESData_IGESEntity)& mycurve3d)
{
  if (myedge.IsNull())
    return 0;

  const TopoDS_Shape&         E     = myedge;
  Handle(IGESData_IGESEntity) C     = mycurve3d;
  Standard_Integer            index = myEdges.FindIndex(E);
  if (index == 0)
  {
    index = myEdges.Add(E);
    myCurves.Append(C);
  }

  return index;
}

//=================================================================================================

Handle(IGESData_IGESEntity) BRepToIGESBRep_Entity::TransferShape(
  const TopoDS_Shape&          start,
  const Message_ProgressRange& theProgress)
{
  Handle(IGESData_IGESEntity) res;
  // TopoDS_Shape theShape;

  if (start.IsNull())
    return res;

  if (start.ShapeType() == TopAbs_VERTEX)
  {
    AddWarning(start, " A Vertex alone is not a IGESBRep Entity");
    TopoDS_Vertex     V = TopoDS::Vertex(start);
    BRepToIGES_BRWire BW(*this);
    BW.SetModel(GetModel());
    res = BW.TransferVertex(V);
    return res;
  }
  else if (start.ShapeType() == TopAbs_EDGE)
  {
    AddWarning(start, " An Edge alone is not a IGESBRep Entity");
    TopoDS_Edge       E = TopoDS::Edge(start);
    BRepToIGES_BRWire BW(*this);
    BW.SetModel(GetModel());
    TopTools_DataMapOfShapeShape anEmptyMap;
    res = BW.TransferEdge(E, anEmptyMap, Standard_False);
    return res;
  }
  else if (start.ShapeType() == TopAbs_WIRE)
  {
    AddWarning(start, " An Wire alone is not a IGESBRep Entity");
    TopoDS_Wire       W = TopoDS::Wire(start);
    BRepToIGES_BRWire BW(*this);
    BW.SetModel(GetModel());
    res = BW.TransferWire(W);
    return res;
  }
  else
  {
    //    theShape = ShapeCustom::DirectFaces(start);
    if (start.ShapeType() == TopAbs_FACE)
    {
      TopoDS_Face F = TopoDS::Face(start);
      res           = TransferFace(F);
    }
    else if (start.ShapeType() == TopAbs_SHELL)
    {
      TopoDS_Shell S = TopoDS::Shell(start);
      res            = TransferShell(S, theProgress);
    }
    else if (start.ShapeType() == TopAbs_SOLID)
    {
      TopoDS_Solid M = TopoDS::Solid(start);
      res            = TransferSolid(M, theProgress);
    }
    else if (start.ShapeType() == TopAbs_COMPSOLID)
    {
      TopoDS_CompSolid C = TopoDS::CompSolid(start);
      res                = TransferCompSolid(C, theProgress);
    }
    else if (start.ShapeType() == TopAbs_COMPOUND)
    {
      TopoDS_Compound C = TopoDS::Compound(start);
      res               = TransferCompound(C, theProgress);
    }
    else
    {
      // error message
    }
  }
  if (res.IsNull())
    return res;

  TransferVertexList();
  TransferEdgeList();
  return res;
}

//=============================================================================
// TransferEdge
//=============================================================================

Handle(IGESData_IGESEntity) BRepToIGESBRep_Entity::TransferEdge(const TopoDS_Edge& myedge)
{
  Standard_Integer anInd = IndexEdge(myedge);
  if (anInd != 0)
  {
    Handle(IGESData_IGESEntity) ICurve3d = Handle(IGESData_IGESEntity)::DownCast(myCurves(anInd));
    if (!ICurve3d.IsNull())
      return ICurve3d;
  }
  BRepToIGES_BRWire BR(*this);
  BR.SetModel(GetModel());
  TopTools_DataMapOfShapeShape anEmptyMap;
  return BR.TransferEdge(myedge, anEmptyMap, Standard_True);
}

//=============================================================================
// TransferEdge
//=============================================================================

Handle(IGESData_IGESEntity) BRepToIGESBRep_Entity::TransferEdge(const TopoDS_Edge&  myedge,
                                                                const TopoDS_Face&  myface,
                                                                const Standard_Real Length)
{
  Handle(IGESData_IGESEntity) ICurve3d;
  Handle(IGESData_IGESEntity) ICurve2d;
  if (myedge.IsNull())
    return ICurve2d;

  BRepToIGES_BRWire BR(*this);
  BR.SetModel(GetModel());
  TopTools_DataMapOfShapeShape anEmptyMap;
  ICurve2d = BR.TransferEdge(myedge, myface, anEmptyMap, Length, Standard_True);

  // curve 3d is obligatory. If it does not exist it is created and stored in "myCurves".
  // If the edge is degenerated, there is no associated 3d. So "edge-tuple"
  // will be a Vertex.

  if (!BRep_Tool::Degenerated(myedge))
  {
    ICurve3d = TransferEdge(myedge);
    if (ICurve3d.IsNull())
    {
      AddFail(myedge, " Transfer Failed : no Curve 3D ");
    }
    AddEdge(myedge, ICurve3d);
  }

  return ICurve2d;
}

//=============================================================================
// TransferWire
//=============================================================================

Handle(IGESSolid_Loop) BRepToIGESBRep_Entity::TransferWire(const TopoDS_Wire&  mywire,
                                                           const TopoDS_Face&  myface,
                                                           const Standard_Real Length)
{
  Handle(IGESSolid_Loop) myLoop = new IGESSolid_Loop;
  if (mywire.IsNull())
    return myLoop;
  Handle(IGESData_IGESEntity) Pointeur;

  TColStd_SequenceOfInteger            Seqindex;
  TColStd_SequenceOfInteger            Seqorient;
  TColStd_SequenceOfInteger            Seqtype;
  Handle(IGESData_IGESEntity)          ent2d;
  Handle(IGESData_IGESEntity)          ent3d;
  Handle(TColStd_HSequenceOfTransient) Seq2d = new TColStd_HSequenceOfTransient();

  BRepTools_WireExplorer WE;
  // Standard_Integer nbedge = 0; //szv#4:S4163:12Mar99 unused
  TopExp_Explorer TE(mywire, TopAbs_VERTEX);
  if (TE.More())
  {
    for (WE.Init(mywire, myface); WE.More(); WE.Next())
    {
      const TopoDS_Edge& E = WE.Current();
      if (E.IsNull())
      {
        AddWarning(mywire, "an Edge is a null entity");
      }
      else
      {
        ent2d = TransferEdge(E, myface, Length);
        Seq2d->Append(ent2d);
        Standard_Integer myindex;

        // add Vertices in the Map "myVertices"
        TopoDS_Vertex V1, V2;
        TopExp::Vertices(E, V1, V2);
        // Standard_Integer Ivertex1, Ivertex2; //szv#4:S4163:12Mar99 not needed
        if (!BRep_Tool::Degenerated(E))
        {
          if (!V1.IsNull())
          {
            AddVertex(V1); // szv#4:S4163:12Mar99 `Ivertex1=` not needed
          }
          if (!V2.IsNull())
          {
            AddVertex(V2); // szv#4:S4163:12Mar99 `Ivertex2=` not needed
          }
          myindex = IndexEdge(E);
          Seqtype.Append(0);
        }
        else
        {
          myindex = AddVertex(V1);
          Seqtype.Append(1);
        }
        Seqindex.Append(myindex);
        if (E.Orientation() == TopAbs_FORWARD)
          Seqorient.Append(1);
        if (E.Orientation() == TopAbs_REVERSED)
          Seqorient.Append(0);
      }
    }
  }
  else
    AddWarning(mywire, " no Vertex associated to the Wire");

  Standard_Integer                            nbedges = Seq2d->Length();
  Handle(TColStd_HArray1OfInteger)            types   = new TColStd_HArray1OfInteger(1, nbedges);
  Standard_Integer                            mytype;
  Handle(IGESData_HArray1OfIGESEntity)        edges = new IGESData_HArray1OfIGESEntity(1, nbedges);
  Handle(IGESData_IGESEntity)                 myedge;
  Handle(TColStd_HArray1OfInteger)            index = new TColStd_HArray1OfInteger(1, nbedges);
  Standard_Integer                            myindex;
  Handle(TColStd_HArray1OfInteger)            orient = new TColStd_HArray1OfInteger(1, nbedges);
  Standard_Integer                            myorient;
  Handle(TColStd_HArray1OfInteger)            nbcurves = new TColStd_HArray1OfInteger(1, nbedges);
  Standard_Integer                            mynbcurve;
  Handle(TColStd_HArray1OfInteger)            flag;
  Handle(IGESBasic_HArray1OfHArray1OfInteger) isoflags =
    new IGESBasic_HArray1OfHArray1OfInteger(1, nbedges);
  Standard_Integer                               myisoflag;
  Handle(IGESData_HArray1OfIGESEntity)           curve;
  Handle(IGESBasic_HArray1OfHArray1OfIGESEntity) curves =
    new IGESBasic_HArray1OfHArray1OfIGESEntity(1, nbedges);
  Handle(IGESData_IGESEntity) mycurve;

  for (Standard_Integer itab = 1; itab <= nbedges; itab++)
  {
    mytype = Seqtype.Value(itab);
    types->SetValue(itab, mytype);
    if (mytype == 0)
      Pointeur = myEdgeList;
    else
      Pointeur = myVertexList;
    edges->SetValue(itab, Pointeur);
    myindex = Seqindex.Value(itab);
    index->SetValue(itab, myindex);
    myorient = Seqorient.Value(itab);
    orient->SetValue(itab, myorient);
    // clang-format off
    mynbcurve = ( Seq2d->Value(itab).IsNull() ? 0 : 1 ); // abv 31 Jan 00: to be able not to write pcurves: was 1
    // clang-format on
    nbcurves->SetValue(itab, mynbcurve);
    myisoflag = 0;
    flag      = new TColStd_HArray1OfInteger(1, 1);
    flag->SetValue(1, myisoflag);
    isoflags->SetValue(itab, flag);
    mycurve = GetCasted(IGESData_IGESEntity, Seq2d->Value(itab));
    curve   = new IGESData_HArray1OfIGESEntity(1, 1);
    curve->SetValue(1, mycurve);
    curves->SetValue(itab, curve);
  }

  myLoop->Init(types, edges, index, orient, nbcurves, isoflags, curves);

  SetShapeResult(mywire, myLoop);

  return myLoop;
}

//=============================================================================
// TransferFace
//
//=============================================================================

Handle(IGESSolid_Face) BRepToIGESBRep_Entity ::TransferFace(const TopoDS_Face& start)
{
  Handle(IGESSolid_Face) myent = new IGESSolid_Face;
  if (start.IsNull())
    return myent;
  Handle(IGESData_IGESEntity) ISurf;
  Standard_Real               Length = 1.;

  // returns the face surface, the face tolerance, the face natural restriction flag.
  // --------------------------------------------------------------------------------
  Handle(Geom_Surface) Surf = BRep_Tool::Surface(start);
  if (!Surf.IsNull())
  {
    Standard_Real U1, U2, V1, V2;
    BRepTools::UVBounds(start, U1, U2, V1, V2); // to limit the base surfaces
    GeomToIGES_GeomSurface GS;
    // S4181 pdn 17.04.99 Boolean flags in order to define write of elementary surfaces added.
    GS.SetBRepMode(Standard_True);
    GS.SetAnalyticMode(Interface_Static::IVal("write.convertsurface.mode") == 0);
    GS.SetModel(GetModel());

    Handle(Geom_Surface) st;
    if (Surf->IsKind(STANDARD_TYPE(Geom_RectangularTrimmedSurface)))
    {
      DeclareAndCast(Geom_RectangularTrimmedSurface, rectang, Surf);
      st = rectang->BasisSurface();
    }
    else
      st = Surf;

    // S4181 pdn 17.04.99 Geom_Plane translated into GeomToIGES_GeomSurface
    ISurf = GS.TransferSurface(st, U1, U2, V1, V2);
    if (ISurf.IsNull())
    {
      AddWarning(start, "the basic surface is a null entity");
      return myent;
    }
    Length = GS.Length();
  }

  // returns the wires of start
  // --------------------------

  // to explore the face , it is required to set it FORWARD.
  TopoDS_Face      myface     = start;
  Standard_Boolean IsReversed = Standard_False;
  if (start.Orientation() == TopAbs_REVERSED)
  {
    myface.Reverse();
    IsReversed = Standard_True;
  }

  // outer wire
  //: n3  TopoDS_Wire Outer = BRepTools::OuterWire(myface);
  TopoDS_Wire            Outer         = ShapeAlgo::AlgoContainer()->OuterWire(myface); //: n3
  Handle(IGESSolid_Loop) OuterLoop     = new IGESSolid_Loop;
  Standard_Boolean       OuterLoopFlag = Standard_False;
  if (!Outer.IsNull())
  {
    OuterLoopFlag = Standard_True;
    OuterLoop     = TransferWire(Outer, myface, Length);
  }

  // inner wires
  TopExp_Explorer                      Ex;
  Handle(TColStd_HSequenceOfTransient) Seq = new TColStd_HSequenceOfTransient();

  for (Ex.Init(myface, TopAbs_WIRE); Ex.More(); Ex.Next())
  {
    TopoDS_Wire            W         = TopoDS::Wire(Ex.Current());
    Handle(IGESSolid_Loop) InnerLoop = new IGESSolid_Loop;
    if (W.IsNull())
    {
      AddWarning(start, " a Wire is a null entity");
    }
    else if (!W.IsSame(Outer))
    {
      InnerLoop = TransferWire(W, myface, Length);
      if (!InnerLoop.IsNull())
        Seq->Append(InnerLoop);
    }
  }

  // all inner edges not in a wire
  for (Ex.Init(myface, TopAbs_EDGE, TopAbs_WIRE); Ex.More(); Ex.Next())
  {
    TopoDS_Edge E = TopoDS::Edge(Ex.Current());
    AddWarning(E, "An edge alone is not transfer as an IGESBRep Entity");
  }

  Standard_Integer                nbent = Seq->Length();
  Handle(IGESSolid_HArray1OfLoop) TabLoop;
  TabLoop = new IGESSolid_HArray1OfLoop(1, nbent + 1);
  TabLoop->SetValue(1, OuterLoop);
  if (nbent >= 1)
  {
    for (Standard_Integer itab = 1; itab <= nbent; itab++)
    {
      Handle(IGESSolid_Loop) item = GetCasted(IGESSolid_Loop, Seq->Value(itab));
      TabLoop->SetValue(itab + 1, item);
    }
  }

  // returns the Face
  // ----------------
  myent->Init(ISurf, OuterLoopFlag, TabLoop);

  if (IsReversed)
    myface.Reverse();

  SetShapeResult(start, myent);

  return myent;
}

//=============================================================================
// TransferShell
//=============================================================================

Handle(IGESSolid_Shell) BRepToIGESBRep_Entity ::TransferShell(
  const TopoDS_Shell&          start,
  const Message_ProgressRange& theProgress)
{
  Handle(IGESSolid_Shell) myshell = new IGESSolid_Shell;
  if (start.IsNull())
    return myshell;

  TopExp_Explorer                      Ex;
  Handle(TColStd_HSequenceOfTransient) Seq = new TColStd_HSequenceOfTransient();
  TColStd_SequenceOfInteger            SeqFlag;
  Handle(IGESSolid_Face)               IFace;

  Standard_Integer nbf = 0;
  for (Ex.Init(start, TopAbs_FACE); Ex.More(); Ex.Next())
    nbf++;
  Message_ProgressScope aPS(theProgress, NULL, nbf);
  for (Ex.Init(start, TopAbs_FACE); Ex.More() && aPS.More(); Ex.Next(), aPS.Next())
  {
    TopoDS_Face F = TopoDS::Face(Ex.Current());
    // clang-format off
    if ( start.Orientation() == TopAbs_REVERSED ) F.Reverse(); //:l4 abv 12 Jan 99: CTS22022-2: writing reversed shells
    // clang-format on
    if (F.IsNull())
    {
      AddWarning(start, " a Face is a null entity");
    }
    else
    {
      IFace = TransferFace(F);
      if (!IFace.IsNull())
      {
        Seq->Append(IFace);
        if (F.Orientation() == TopAbs_FORWARD)
          SeqFlag.Append(1);
        if (F.Orientation() == TopAbs_REVERSED)
          SeqFlag.Append(0);
      }
    }
  }

  Standard_Integer                 nbfaces = Seq->Length();
  Handle(IGESSolid_HArray1OfFace)  TabFace = new IGESSolid_HArray1OfFace(1, nbfaces);
  Handle(TColStd_HArray1OfInteger) TabFlag = new TColStd_HArray1OfInteger(1, nbfaces);
  for (Standard_Integer itab = 1; itab <= nbfaces; itab++)
  {
    Handle(IGESSolid_Face) itemface = GetCasted(IGESSolid_Face, Seq->Value(itab));
    TabFace->SetValue(itab, itemface);
    Standard_Integer item = SeqFlag.Value(itab);
    TabFlag->SetValue(itab, item);
  }

  myshell->Init(TabFace, TabFlag);

  SetShapeResult(start, myshell);

  return myshell;
}

//=============================================================================
// TransferSolid
// with a Solid
//=============================================================================

Handle(IGESSolid_ManifoldSolid) BRepToIGESBRep_Entity ::TransferSolid(
  const TopoDS_Solid&          start,
  const Message_ProgressRange& theProgress)
{
  Handle(IGESSolid_ManifoldSolid) mysol = new IGESSolid_ManifoldSolid;
  if (start.IsNull())
    return mysol;

  TopExp_Explorer                      Ex;
  Handle(IGESSolid_Shell)              IShell, FirstShell;
  Standard_Integer                     ShellFlag = 1;
  Handle(TColStd_HSequenceOfTransient) Seq       = new TColStd_HSequenceOfTransient();
  TColStd_SequenceOfInteger            SeqFlag;

  Standard_Integer nbs = 0;
  for (Ex.Init(start, TopAbs_SHELL); Ex.More(); Ex.Next())
    nbs++;
  Message_ProgressScope aPS(theProgress, NULL, nbs);
  for (Ex.Init(start, TopAbs_SHELL); Ex.More() && aPS.More(); Ex.Next())
  {
    Message_ProgressRange aRange = aPS.Next();
    TopoDS_Shell          S      = TopoDS::Shell(Ex.Current());
    if (S.IsNull())
    {
      AddWarning(start, " a Shell is a null entity");
    }
    else
    {
      IShell = TransferShell(S, aRange);
      if (!IShell.IsNull())
      {
        Seq->Append(IShell);
        if (S.Orientation() == TopAbs_FORWARD)
          SeqFlag.Append(1);
        if (S.Orientation() == TopAbs_REVERSED)
          SeqFlag.Append(0);
      }
    }
  }

  Standard_Integer                 nbshells = Seq->Length();
  Handle(IGESSolid_HArray1OfShell) Tab;
  Handle(TColStd_HArray1OfInteger) TabFlag;
  if (nbshells > 1)
  {
    Tab     = new IGESSolid_HArray1OfShell(1, nbshells - 1);
    TabFlag = new TColStd_HArray1OfInteger(1, nbshells - 1);
    for (Standard_Integer itab = 1; itab <= nbshells; itab++)
    {
      Handle(IGESSolid_Shell) itemShell = GetCasted(IGESSolid_Shell, Seq->Value(itab));
      Standard_Integer        item      = SeqFlag.Value(itab);
      if (itab == 1)
      {
        FirstShell = itemShell;
        ShellFlag  = item;
      }
      else
      {
        Tab->SetValue(itab - 1, itemShell);
        TabFlag->SetValue(itab - 1, item);
      }
    }
  }

  if (nbshells == 1)
  {
    FirstShell = GetCasted(IGESSolid_Shell, Seq->Value(1));
    ShellFlag  = SeqFlag.Value(1);
    Tab.Nullify();
    TabFlag.Nullify();
    mysol->Init(FirstShell, ShellFlag != 0, Tab, TabFlag);
  }
  else if (nbshells >= 2)
  {
    mysol->Init(FirstShell, ShellFlag != 0, Tab, TabFlag);
  }
  else
    AddWarning(start, " no Result ");

  SetShapeResult(start, mysol);

  return mysol;
}

//=============================================================================
// TransferCompSolid
// with a CompSolid
//=============================================================================

Handle(IGESData_IGESEntity) BRepToIGESBRep_Entity::TransferCompSolid(
  const TopoDS_CompSolid&      start,
  const Message_ProgressRange& theProgress)
{
  Handle(IGESData_IGESEntity) myent;
  if (start.IsNull())
    return myent;

  TopExp_Explorer                      Ex;
  Handle(IGESSolid_ManifoldSolid)      ISolid = new IGESSolid_ManifoldSolid;
  Handle(TColStd_HSequenceOfTransient) Seq    = new TColStd_HSequenceOfTransient();

  Standard_Integer nbs = 0;
  for (Ex.Init(start, TopAbs_SOLID); Ex.More(); Ex.Next())
    nbs++;
  Message_ProgressScope aPS(theProgress, NULL, nbs);
  for (Ex.Init(start, TopAbs_SOLID); Ex.More() && aPS.More(); Ex.Next())
  {
    Message_ProgressRange aRange = aPS.Next();
    TopoDS_Solid          S      = TopoDS::Solid(Ex.Current());
    if (S.IsNull())
    {
      AddWarning(start, " an Solid is a null entity");
    }
    else
    {
      ISolid = TransferSolid(S, aRange);
      if (!ISolid.IsNull())
        Seq->Append(ISolid);
    }
  }

  Standard_Integer                     nbsolids = Seq->Length();
  Handle(IGESData_HArray1OfIGESEntity) Tab;
  if (nbsolids > 1)
  {
    Tab = new IGESData_HArray1OfIGESEntity(1, nbsolids);
    for (Standard_Integer itab = 1; itab <= nbsolids; itab++)
    {
      Handle(IGESData_IGESEntity) item = GetCasted(IGESData_IGESEntity, Seq->Value(itab));
      Tab->SetValue(itab, item);
    }
  }

  if (nbsolids == 1)
  {
    myent = ISolid;
  }
  else if (nbsolids > 1)
  {
    Handle(IGESBasic_Group) IGroup = new IGESBasic_Group;
    IGroup->Init(Tab);
    myent = IGroup;
  }

  SetShapeResult(start, myent);

  return myent;
}

//=============================================================================
// TransferCompound
// with a Compound
//=============================================================================

Handle(IGESData_IGESEntity) BRepToIGESBRep_Entity::TransferCompound(
  const TopoDS_Compound&       start,
  const Message_ProgressRange& theProgress)
{
  Handle(IGESData_IGESEntity) res;
  if (start.IsNull())
    return res;

  TopExp_Explorer                      Ex;
  Handle(IGESData_IGESEntity)          IShape;
  Handle(TColStd_HSequenceOfTransient) Seq = new TColStd_HSequenceOfTransient();

  // count numbers of subshapes
  Standard_Integer nbshapes = 0;
  for (Ex.Init(start, TopAbs_SOLID); Ex.More(); Ex.Next())
    nbshapes++;
  for (Ex.Init(start, TopAbs_SHELL, TopAbs_SOLID); Ex.More(); Ex.Next())
    nbshapes++;
  for (Ex.Init(start, TopAbs_FACE, TopAbs_SHELL); Ex.More(); Ex.Next())
    nbshapes++;
  for (Ex.Init(start, TopAbs_WIRE, TopAbs_FACE); Ex.More(); Ex.Next())
    nbshapes++;
  for (Ex.Init(start, TopAbs_EDGE, TopAbs_WIRE); Ex.More(); Ex.Next())
    nbshapes++;
  for (Ex.Init(start, TopAbs_VERTEX, TopAbs_EDGE); Ex.More(); Ex.Next())
    nbshapes++;
  Message_ProgressScope aPS(theProgress, NULL, nbshapes);

  // take all Solids
  for (Ex.Init(start, TopAbs_SOLID); Ex.More() && aPS.More(); Ex.Next())
  {
    Message_ProgressRange aRange = aPS.Next();
    TopoDS_Solid          S      = TopoDS::Solid(Ex.Current());
    if (S.IsNull())
    {
      AddWarning(start, " a Solid is a null entity");
    }
    else
    {
      IShape = TransferSolid(S, aRange);
      if (!IShape.IsNull())
        Seq->Append(IShape);
    }
  }

  // take all isolated Shells
  for (Ex.Init(start, TopAbs_SHELL, TopAbs_SOLID); Ex.More() && aPS.More(); Ex.Next())
  {
    Message_ProgressRange aRange = aPS.Next();
    TopoDS_Shell          S      = TopoDS::Shell(Ex.Current());
    if (S.IsNull())
    {
      AddWarning(start, " a Shell is a null entity");
    }
    else
    {
      IShape = TransferShell(S, aRange);
      if (!IShape.IsNull())
        Seq->Append(IShape);
    }
  }

  // take all isolated Faces
  for (Ex.Init(start, TopAbs_FACE, TopAbs_SHELL); Ex.More() && aPS.More(); Ex.Next(), aPS.Next())
  {
    TopoDS_Face S = TopoDS::Face(Ex.Current());
    if (S.IsNull())
    {
      AddWarning(start, " a Face is a null entity");
    }
    else
    {
      IShape = TransferFace(S);
      if (!IShape.IsNull())
        Seq->Append(IShape);
    }
  }

  // take all isolated Wires
  for (Ex.Init(start, TopAbs_WIRE, TopAbs_FACE); Ex.More() && aPS.More(); Ex.Next(), aPS.Next())
  {
    TopoDS_Wire S = TopoDS::Wire(Ex.Current());

    BRepToIGES_BRWire BW(*this);
    BW.SetModel(GetModel());
    IShape = BW.TransferWire(S);
    if (!IShape.IsNull())
      Seq->Append(IShape);
  }

  // take all isolated Edges
  for (Ex.Init(start, TopAbs_EDGE, TopAbs_WIRE); Ex.More() && aPS.More(); Ex.Next(), aPS.Next())
  {
    TopoDS_Edge S = TopoDS::Edge(Ex.Current());

    BRepToIGES_BRWire BW(*this);
    BW.SetModel(GetModel());
    TopTools_DataMapOfShapeShape anEmptyMap;
    IShape = BW.TransferEdge(S, anEmptyMap, Standard_False);
    if (!IShape.IsNull())
      Seq->Append(IShape);
  }

  // take all isolated Vertices
  for (Ex.Init(start, TopAbs_VERTEX, TopAbs_EDGE); Ex.More() && aPS.More(); Ex.Next(), aPS.Next())
  {
    TopoDS_Vertex S = TopoDS::Vertex(Ex.Current());

    BRepToIGES_BRWire BW(*this);
    BW.SetModel(GetModel());
    IShape = BW.TransferVertex(S);
    if (!IShape.IsNull())
      Seq->Append(IShape);
  }

  // construct the group
  nbshapes = Seq->Length();
  if (nbshapes > 0)
  {
    Handle(IGESData_HArray1OfIGESEntity) Tab = new IGESData_HArray1OfIGESEntity(1, nbshapes);
    for (Standard_Integer itab = 1; itab <= nbshapes; itab++)
    {
      Handle(IGESData_IGESEntity) item = GetCasted(IGESData_IGESEntity, Seq->Value(itab));
      Tab->SetValue(itab, item);
    }

    Handle(IGESBasic_Group) IGroup = new IGESBasic_Group;
    IGroup->Init(Tab);
    res = IGroup;
  }

  SetShapeResult(start, res);

  return res;
}