OCCT

// Created on: 1995-02-22
// Created by: Jacques GOUSSARD
// 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.

#include <BRep_Builder.hxx>
#include <BRep_GCurve.hxx>
#include <BRep_TEdge.hxx>
#include <BRep_Tool.hxx>
#include <BRepAdaptor_Curve.hxx>
#include <BRepAdaptor_Curve2d.hxx>
#include <BRepFill_DataMapOfShapeSequenceOfReal.hxx>
#include <BRepLib.hxx>
#include <BRepLib_MakeVertex.hxx>
#include <BRepOffsetAPI_DraftAngle.hxx>
#include <BRepOffsetAPI_SequenceOfSequenceOfReal.hxx>
#include <BRepOffsetAPI_SequenceOfSequenceOfShape.hxx>
#include <BRepTools.hxx>
#include <BRepTools_Substitution.hxx>
#include <Draft_Modification.hxx>
#include <Geom2d_Curve.hxx>
#include <Geom_Surface.hxx>
#include <gp_Dir.hxx>
#include <gp_Pln.hxx>
#include <Precision.hxx>
#include <Standard_NullObject.hxx>
#include <TColgp_SequenceOfPnt.hxx>
#include <TColStd_SequenceOfReal.hxx>
#include <TopExp.hxx>
#include <TopExp_Explorer.hxx>
#include <TopLoc_Location.hxx>
#include <TopoDS.hxx>
#include <TopoDS_Face.hxx>
#include <TopoDS_Iterator.hxx>
#include <TopoDS_Shape.hxx>
#include <TopTools_DataMapOfShapeSequenceOfShape.hxx>
#include <TopTools_SequenceOfShape.hxx>

#include <Geom2dInt_GInter.hxx>
#include <IntRes2d_IntersectionPoint.hxx>

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

BRepOffsetAPI_DraftAngle::BRepOffsetAPI_DraftAngle() {}

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

BRepOffsetAPI_DraftAngle::BRepOffsetAPI_DraftAngle(const TopoDS_Shape& S)
{
  myInitialShape = S;
  myModification = new Draft_Modification(S);
}

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

void BRepOffsetAPI_DraftAngle::Clear()
{
  if (!myModification.IsNull())
  {
    Handle(Draft_Modification)::DownCast(myModification)->Clear();
  }
}

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

void BRepOffsetAPI_DraftAngle::Init(const TopoDS_Shape& S)
{
  myInitialShape = S;
  NotDone();
  if (!myModification.IsNull())
  {
    Handle(Draft_Modification)::DownCast(myModification)->Init(S);
  }
  else
  {
    myModification = new Draft_Modification(S);
  }
}

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

void BRepOffsetAPI_DraftAngle::Add(const TopoDS_Face&     F,
                                   const gp_Dir&          D,
                                   const Standard_Real    Angle,
                                   const gp_Pln&          Plane,
                                   const Standard_Boolean Flag)
{
  // POP-DPF : protection
  if (Abs(Angle) <= 1.e-04)
    return;
  Standard_NullObject_Raise_if(myInitialShape.IsNull(),
                               "BRepOffsetAPI_DraftAngle::Add() - initial shape is not set");
  Handle(Draft_Modification)::DownCast(myModification)->Add(F, D, Angle, Plane, Flag);
}

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

Standard_Boolean BRepOffsetAPI_DraftAngle::AddDone() const
{
  Standard_NullObject_Raise_if(myInitialShape.IsNull(),
                               "BRepOffsetAPI_DraftAngle::AddDone() - initial shape is not set");
  return Handle(Draft_Modification)::DownCast(myModification)->ProblematicShape().IsNull();
}

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

void BRepOffsetAPI_DraftAngle::Remove(const TopoDS_Face& F)
{
  Standard_NullObject_Raise_if(myInitialShape.IsNull(),
                               "BRepOffsetAPI_DraftAngle::Remove() - initial shape is not set");
  Handle(Draft_Modification)::DownCast(myModification)->Remove(F);
}

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

const TopoDS_Shape& BRepOffsetAPI_DraftAngle::ProblematicShape() const
{
  Standard_NullObject_Raise_if(
    myInitialShape.IsNull(),
    "BRepOffsetAPI_DraftAngle::ProblematicShape() - initial shape is not set");
  return Handle(Draft_Modification)::DownCast(myModification)->ProblematicShape();
}

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

Draft_ErrorStatus BRepOffsetAPI_DraftAngle::Status() const
{
  Standard_NullObject_Raise_if(myInitialShape.IsNull(),
                               "BRepOffsetAPI_DraftAngle::Status() - initial shape is not set");
  return Handle(Draft_Modification)::DownCast(myModification)->Error();
}

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

const TopTools_ListOfShape& BRepOffsetAPI_DraftAngle::ConnectedFaces(const TopoDS_Face& F) const
{
  Standard_NullObject_Raise_if(
    myInitialShape.IsNull(),
    "BRepOffsetAPI_DraftAngle::ConnectedFaces() - initial shape is not set");
  return Handle(Draft_Modification)::DownCast(myModification)->ConnectedFaces(F);
}

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

const TopTools_ListOfShape& BRepOffsetAPI_DraftAngle::ModifiedFaces() const
{
  Standard_NullObject_Raise_if(
    myInitialShape.IsNull(),
    "BRepOffsetAPI_DraftAngle::ModifiedFaces() - initial shape is not set");
  return Handle(Draft_Modification)::DownCast(myModification)->ModifiedFaces();
}

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

const TopTools_ListOfShape& BRepOffsetAPI_DraftAngle::Generated(const TopoDS_Shape& S)
{
  myGenerated.Clear();
  Standard_NullObject_Raise_if(myInitialShape.IsNull(),
                               "BRepOffsetAPI_DraftAngle::Generated() - initial shape is not set");
  Handle(Draft_Modification) DMod = Handle(Draft_Modification)::DownCast(myModification);

  if (S.ShapeType() == TopAbs_FACE)
  {
    Handle(Geom_Surface) Surf;
    TopLoc_Location      L;
    Standard_Real        Tol;
    Standard_Boolean     RW, RF;
    if (DMod->NewSurface(TopoDS::Face(S), Surf, L, Tol, RW, RF))
    {
      if (myVtxToReplace.IsEmpty())
      {
        myGenerated.Append(ModifiedShape(S));
      }
      else
      {
        myGenerated.Append(mySubs.Value(ModifiedShape(S)));
      }
    }
  }
  return myGenerated;
}

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

const TopTools_ListOfShape& BRepOffsetAPI_DraftAngle::Modified(const TopoDS_Shape& S)
{
  myGenerated.Clear();
  Standard_NullObject_Raise_if(myInitialShape.IsNull(),
                               "BRepOffsetAPI_DraftAngle::Modified() - initial shape is not set");
  Handle(Draft_Modification) DMod = Handle(Draft_Modification)::DownCast(myModification);

  if (S.ShapeType() == TopAbs_FACE)
  {
    Handle(Geom_Surface) Surf;
    TopLoc_Location      L;
    Standard_Real        Tol;
    Standard_Boolean     RW, RF;

    if (!DMod->NewSurface(TopoDS::Face(S), Surf, L, Tol, RW, RF))
    {
      // Ce n est pas une generation => peut etre une  modif
      if (myVtxToReplace.IsEmpty())
      {
        myGenerated.Append(ModifiedShape(S));
      }
      else
      {
        myGenerated.Append(mySubs.Value(ModifiedShape(S)));
      }
      if (myGenerated.Extent() == 1 && myGenerated.First().IsSame(S))
      {
        myGenerated.Clear();
      }
    }
  }
  return myGenerated;
}

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

TopoDS_Shape BRepOffsetAPI_DraftAngle::ModifiedShape(const TopoDS_Shape& S) const
{
  if (S.ShapeType() == TopAbs_VERTEX)
  {
    if (myVtxToReplace.IsBound(S))
    {
      return myVtxToReplace(S);
    }
  }
  if (myVtxToReplace.IsEmpty())
  {
    return myModifier.ModifiedShape(S);
  }
  else
  {
    const TopoDS_Shape& aNS = myModifier.ModifiedShape(S);
    return mySubs.Value(aNS);
  }
}

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

void BRepOffsetAPI_DraftAngle::Build(const Message_ProgressRange& /*theRange*/)
{
  Handle(Draft_Modification)::DownCast(myModification)->Perform();
  if (!Handle(Draft_Modification)::DownCast(myModification)->IsDone())
  {
    NotDone();
  }
  else
  {
    DoModif(myInitialShape);
    CorrectWires();
    CorrectVertexTol();
  }
}

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

void BRepOffsetAPI_DraftAngle::CorrectWires()
{
  Standard_Real    TolInter = 1.e-7;
  Standard_Integer i, j, k;

  TopTools_SequenceOfShape Eseq;
  TopTools_SequenceOfShape Wseq;
  TopTools_SequenceOfShape Fseq;
  TopoDS_Shape             CurEdge, CurWire, CurFace;
  TopoDS_Iterator          wit, eit;

  TopExp_Explorer fexp(myShape, TopAbs_FACE);
  for (; fexp.More(); fexp.Next())
  {
    CurFace = fexp.Current();
    wit.Initialize(CurFace);
    for (; wit.More(); wit.Next())
    {
      CurWire = wit.Value();
      TopTools_MapOfShape emap;
      eit.Initialize(CurWire);
      for (; eit.More(); eit.Next())
        emap.Add(eit.Value());
      TopTools_MapIteratorOfMapOfShape mapit(emap);
      for (; mapit.More(); mapit.Next())
      {
        CurEdge = mapit.Key();
        if (BRepTools::IsReallyClosed(TopoDS::Edge(CurEdge), TopoDS::Face(CurFace)))
        {
          Eseq.Append(CurEdge);
          Wseq.Append(CurWire);
          Fseq.Append(CurFace);
        }
      }
    }
  }

  BRepFill_DataMapOfShapeSequenceOfReal Emap;

  TopTools_SequenceOfShape                NonSeam;
  TopTools_SequenceOfShape                NonSeamWires;
  BRepOffsetAPI_SequenceOfSequenceOfReal  ParsNonSeam;
  BRepOffsetAPI_SequenceOfSequenceOfShape Seam;
  BRepOffsetAPI_SequenceOfSequenceOfReal  ParsSeam;

  TopTools_DataMapOfShapeShape       WFmap;
  TopTools_DataMapOfShapeListOfShape WWmap;
  for (i = 1; i <= Eseq.Length(); i++)
  {
    CurEdge = Eseq(i);
    CurWire = Wseq(i);
    CurFace = Fseq(i);
    //
    const TopoDS_Face& aFace = TopoDS::Face(CurFace);
    //
    // Prepare 2D adaptors for intersection.
    // The seam edge has two 2D curve, thus we have to create 2 adaptors
    BRepAdaptor_Curve2d aBAC2D1(TopoDS::Edge(CurEdge), aFace);
    BRepAdaptor_Curve2d aBAC2D1R(TopoDS::Edge(CurEdge.Reversed()), aFace);
    // Get surface of the face to get 3D intersection point
    TopLoc_Location             aLoc;
    const Handle(Geom_Surface)& aSurf = BRep_Tool::Surface(aFace, aLoc);
    // Get the tolerance of the current edge to compare intersection points
    Standard_Real aTolCurE = BRep_Tool::Tolerance(TopoDS::Edge(CurEdge));
    //
    wit.Initialize(CurFace);
    for (; wit.More(); wit.Next())
    {
      const TopoDS_Shape& aWire = wit.Value();
      if (!aWire.IsSame(CurWire))
      {
        TColgp_SequenceOfPnt pts;
        Standard_Boolean     Wadd = Standard_False;
        eit.Initialize(aWire);
        for (; eit.More(); eit.Next())
        {
          const TopoDS_Edge& anEdge = TopoDS::Edge(eit.Value());
          //
          // Prepare 2D adaptor for intersection
          BRepAdaptor_Curve2d aBAC2D2(anEdge, aFace);
          // Perform intersection
          Geom2dInt_GInter aGInter;
          aGInter.Perform(aBAC2D1, aBAC2D2, TolInter, TolInter);
          if (!aGInter.IsDone() || aGInter.IsEmpty())
          {
            // If first intersection is empty try intersection with reversed edge
            aGInter.Perform(aBAC2D1R, aBAC2D2, TolInter, TolInter);
            if (!aGInter.IsDone() || aGInter.IsEmpty())
            {
              continue;
            }
          }
          //
          Wadd = Standard_True;
          if (!WFmap.IsBound(aWire))
            WFmap.Bind(aWire, CurFace);
          Standard_Integer ind = 0;
          for (j = 1; j <= NonSeam.Length(); j++)
          {
            if (anEdge.IsSame(NonSeam(j)))
            {
              ind = j;
              break;
            }
          }
          if (ind == 0)
          {
            NonSeam.Append(anEdge);
            NonSeamWires.Append(aWire);
            ind = NonSeam.Length();
            TColStd_SequenceOfReal   emptyseq1, emptyseq2;
            TopTools_SequenceOfShape emptyedgeseq;
            ParsNonSeam.Append(emptyseq1);
            Seam.Append(emptyedgeseq);
            ParsSeam.Append(emptyseq2);
          }
          if (!Emap.IsBound(CurEdge))
          {
            TColStd_SequenceOfReal emptyseq;
            Emap.Bind(CurEdge, emptyseq);
          }
          //
          // Get the tolerance of edge to compare intersection points
          Standard_Real aTolE = BRep_Tool::Tolerance(anEdge);
          // Tolerance to compare the intersection points is the maximal
          // tolerance of intersecting edges
          Standard_Real aTolCmp = Max(aTolCurE, aTolE);
          //
          Standard_Integer aNbIntPnt = aGInter.NbPoints();
          for (k = 1; k <= aNbIntPnt; ++k)
          {
            const IntRes2d_IntersectionPoint& aP2DInt = aGInter.Point(k);
            const gp_Pnt2d&                   aP2D    = aP2DInt.Value();
            gp_Pnt                            aP3D    = aSurf->Value(aP2D.X(), aP2D.Y());
            //
            // Check if the intersection point is new
            Standard_Integer ied = 0;
            for (j = 1; j <= pts.Length(); j++)
            {
              if (aP3D.IsEqual(pts(j), aTolCmp))
              {
                ied = j;
                break;
              }
            }
            if (ied == 0)
            {
              pts.Append(aP3D);
              Emap(CurEdge).Append(aP2DInt.ParamOnFirst());
              ParsNonSeam(ind).Append(aP2DInt.ParamOnSecond());
              Seam(ind).Append(CurEdge);
              ParsSeam(ind).Append(aP2DInt.ParamOnFirst());
            }
          }
        } // for (; eit.More(); eit.Next())
        if (Wadd)
        {
          if (!WWmap.IsBound(CurWire))
          {
            TopTools_ListOfShape emptylist;
            WWmap.Bind(CurWire, emptylist);
          }
          WWmap(CurWire).Append(aWire);
        }
      } // if (! aWire.IsSame( CurWire ))
    } // for (; wit.More(); wit.Next())
  } // for (i = 1; i <= Eseq.Length(); i++)

  // Sorting
  for (i = 1; i <= NonSeam.Length(); i++)
  {
    for (j = 1; j < ParsNonSeam(i).Length(); j++)
    {
      for (k = j + 1; k <= ParsNonSeam(i).Length(); k++)
      {
        if (ParsNonSeam(i)(k) < ParsNonSeam(i)(j))
        {
          Standard_Real temp = ParsNonSeam(i)(j);
          ParsNonSeam(i)(j)  = ParsNonSeam(i)(k);
          ParsNonSeam(i)(k)  = temp;
          TopoDS_Shape tmp   = Seam(i)(j);
          Seam(i)(j)         = Seam(i)(k);
          Seam(i)(k)         = tmp;
          temp               = ParsSeam(i)(j);
          ParsSeam(i)(j)     = ParsSeam(i)(k);
          ParsSeam(i)(k)     = temp;
        }
      }
    }
  }
  BRepFill_DataMapIteratorOfDataMapOfShapeSequenceOfReal iter(Emap);
  for (; iter.More(); iter.Next())
  {
    TColStd_SequenceOfReal Seq = iter.Value();
    for (i = 1; i < Seq.Length(); i++)
    {
      for (j = i + 1; j <= Seq.Length(); j++)
      {
        if (Seq(j) < Seq(i))
        {
          Standard_Real temp = Seq(i);
          Seq(i)             = Seq(j);
          Seq(j)             = temp;
        }
      }
    }
    Emap(iter.Key()) = Seq;
  }
  BRepFill_DataMapOfShapeSequenceOfReal  EPmap;
  TopTools_DataMapOfShapeSequenceOfShape EVmap; // Seam
  TopTools_DataMapOfShapeSequenceOfShape EWmap; // Seam and wires intersecting it
  iter.Initialize(Emap);
  for (; iter.More(); iter.Next())
  {
    TColStd_SequenceOfReal parseq;
    EPmap.Bind(iter.Key(), parseq);
    TopTools_SequenceOfShape shapeseq;
    EVmap.Bind(iter.Key(), shapeseq);
    TopTools_SequenceOfShape shapeseq2;
    EWmap.Bind(iter.Key(), shapeseq2);
  }

  // Reconstruction of non-seam edges
  BRepTools_Substitution aSub;
  BRep_Builder           BB;
  for (i = 1; i <= NonSeam.Length(); i++)
  {
    TopoDS_Edge          anEdge = TopoDS::Edge(NonSeam(i));
    TopTools_ListOfShape NewEdges;
    TopoDS_Edge          NewE;
    TopoDS_Vertex        Vfirst, Vlast;
    TopExp::Vertices(anEdge, Vfirst, Vlast);
    Standard_Real par, FirstPar, LastPar;
    BRep_Tool::Range(anEdge, FirstPar, LastPar);
    Standard_Integer firstind = 1;
    par                       = ParsNonSeam(i)(1);
    TopoDS_Edge SeamEdge      = TopoDS::Edge(Seam(i)(1));
    // Find the face
    for (j = 1; j <= Eseq.Length(); j++)
      if (SeamEdge.IsSame(Eseq(j)))
        break;
    TopoDS_Face          theFace = TopoDS::Face(Fseq(j));
    TopLoc_Location      L;
    Handle(Geom_Surface) theSurf = BRep_Tool::Surface(theFace, L);
    if (Abs(par - FirstPar) <= Precision::Confusion())
    {
      BB.UpdateVertex(Vfirst, ParsSeam(i)(1), SeamEdge, BRep_Tool::Tolerance(Vfirst));
      EPmap(SeamEdge).Append(ParsSeam(i)(1));
      EVmap(SeamEdge).Append(Vfirst);
      EWmap(SeamEdge).Append(NonSeamWires(i));
      firstind = 2;
    }
    Standard_Real prevpar = FirstPar;
    TopoDS_Vertex PrevV   = Vfirst;
    for (j = firstind; j <= ParsNonSeam(i).Length(); j++)
    {
      TopoDS_Shape aLocalShape = anEdge.EmptyCopied();
      NewE                     = TopoDS::Edge(aLocalShape);
      // NewE = TopoDS::Edge( anEdge.EmptyCopied() );
      TopoDS_Vertex NewV;
      par = ParsNonSeam(i)(j);
      BB.Range(NewE, prevpar, par);
      SeamEdge = TopoDS::Edge(Seam(i)(j));
      if (j == ParsNonSeam(i).Length() && Abs(par - LastPar) <= Precision::Confusion())
      {
        NewV = Vlast;
        if (firstind == 2 && j == 2)
        {
          BB.UpdateVertex(Vlast, ParsSeam(i)(j), SeamEdge, BRep_Tool::Tolerance(Vlast));
          EPmap(SeamEdge).Append(ParsSeam(i)(j));
          EVmap(SeamEdge).Append(Vlast);
          EWmap(SeamEdge).Append(NonSeamWires(i));
          break;
        }
      }
      else
      {
        BRepAdaptor_Curve bcur(NewE);
        gp_Pnt            Point = bcur.Value(par);
        NewV                    = BRepLib_MakeVertex(Point);
        BB.UpdateVertex(NewV, par, NewE, 10. * Precision::Confusion());
      }
      BB.UpdateVertex(NewV, ParsSeam(i)(j), SeamEdge, 10. * Precision::Confusion());
      NewE.Orientation(TopAbs_FORWARD);
      BB.Add(NewE, PrevV.Oriented(TopAbs_FORWARD));
      BB.Add(NewE, NewV.Oriented(TopAbs_REVERSED));

      NewEdges.Append(NewE);
      EPmap(SeamEdge).Append(ParsSeam(i)(j));
      EVmap(SeamEdge).Append(NewV);
      EWmap(SeamEdge).Append(NonSeamWires(i));

      prevpar = par;
      PrevV   = NewV;
    }
    // The last edge
    TopoDS_Shape aLocalShape = anEdge.EmptyCopied();
    NewE                     = TopoDS::Edge(aLocalShape);
    // NewE = TopoDS::Edge( anEdge.EmptyCopied() );
    par = LastPar;
    if (Abs(prevpar - par) > Precision::Confusion())
    {
      BB.Range(NewE, prevpar, par);
      NewE.Orientation(TopAbs_FORWARD);
      BB.Add(NewE, PrevV.Oriented(TopAbs_FORWARD));
      BB.Add(NewE, Vlast.Oriented(TopAbs_REVERSED));
      NewEdges.Append(NewE);
    }

    // Substitute anEdge by NewEdges
    aSub.Substitute(anEdge, NewEdges);
  }

  // Sorting of EPmap and EVmap and removing repeating points from them
  iter.Initialize(EPmap);
  for (; iter.More(); iter.Next())
  {
    TColStd_SequenceOfReal Seq;
    Seq = iter.Value();
    TopTools_SequenceOfShape SeqShape;
    SeqShape = EVmap(iter.Key());
    TopTools_SequenceOfShape SeqShape2;
    SeqShape2 = EWmap(iter.Key());
    for (i = 1; i < Seq.Length(); i++)
    {
      for (j = i + 1; j <= Seq.Length(); j++)
      {
        if (Seq(j) < Seq(i))
        {
          Standard_Real temp = Seq(i);
          Seq(i)             = Seq(j);
          Seq(j)             = temp;
          TopoDS_Shape tmp   = SeqShape(i);
          SeqShape(i)        = SeqShape(j);
          SeqShape(j)        = tmp;
          tmp                = SeqShape2(i);
          SeqShape2(i)       = SeqShape2(j);
          SeqShape2(j)       = tmp;
        }
      }
    }

    EPmap(iter.Key()) = Seq;
    EVmap(iter.Key()) = SeqShape;
    EWmap(iter.Key()) = SeqShape2;
  }
  iter.Initialize(EPmap);
  for (; iter.More(); iter.Next())
  {
    TColStd_SequenceOfReal Seq;
    Seq = iter.Value();
    TopTools_SequenceOfShape SeqShape;
    SeqShape = EVmap(iter.Key());
    TopTools_SequenceOfShape SeqShape2;
    SeqShape2               = EWmap(iter.Key());
    Standard_Boolean remove = Standard_True;
    while (remove)
    {
      remove = Standard_False;
      for (i = 1; i < Seq.Length(); i++)
      {
        if (Abs(Seq(i) - Seq(i + 1)) <= Precision::Confusion())
        {
          Seq.Remove(i + 1);
          SeqShape.Remove(i + 1);
          SeqShape2.Remove(i + 1);
          remove = Standard_True;
        }
      }
    }
    EPmap(iter.Key()) = Seq;
    EVmap(iter.Key()) = SeqShape;
    EWmap(iter.Key()) = SeqShape2;
  }

  // Reconstruction of seam edges
  TopTools_DataMapOfShapeShape VEmap;
  iter.Initialize(Emap);
  for (; iter.More(); iter.Next())
  {
    TopoDS_Edge            anEdge   = TopoDS::Edge(iter.Key());
    Standard_Boolean       onepoint = Standard_False;
    TopTools_ListOfShape   NewEdges;
    TColStd_SequenceOfReal Seq;
    Seq = iter.Value();
    TColStd_SequenceOfReal Seq2;
    Seq2 = EPmap(anEdge);
    TopTools_SequenceOfShape SeqVer;
    SeqVer = EVmap(anEdge);
    TopTools_SequenceOfShape SeqWire;
    SeqWire = EWmap(anEdge);
    TopoDS_Vertex Vfirst, Vlast;
    TopExp::Vertices(anEdge, Vfirst, Vlast);
    Standard_Real fpar, lpar, FirstPar, LastPar;
    BRep_Tool::Range(anEdge, FirstPar, LastPar);
    fpar = FirstPar;
    lpar = Seq(1);
    TopoDS_Edge      NewE;
    Standard_Integer firstind = 1;
    if (Abs(fpar - lpar) <= Precision::Confusion())
    {
      firstind = 2;
      fpar     = Seq(1);
      lpar     = Seq(2);
    }
    else
    {
      if (Seq.Length() % 2 != 0)
      {
        VEmap.Bind(Vfirst, anEdge);
        firstind = 2;
        fpar     = Seq(1);
        if (Seq.Length() > 2)
          lpar = Seq(2);
        else
          onepoint = Standard_True;
      }
    }
    if (!onepoint)
    {
      TopoDS_Shape aLocalShape = anEdge.EmptyCopied();
      NewE                     = TopoDS::Edge(aLocalShape);
      // NewE = TopoDS::Edge( anEdge.EmptyCopied() );
      BB.Range(NewE, fpar, lpar);
      NewE.Orientation(TopAbs_FORWARD);
      if (firstind == 1)
      {
        BB.Add(NewE, Vfirst.Oriented(TopAbs_FORWARD));
        aLocalShape = SeqVer(1).Oriented(TopAbs_REVERSED);
        BB.Add(NewE, TopoDS::Vertex(aLocalShape));
        // BB.Add( NewE, TopoDS::Vertex( SeqVer(1).Oriented(TopAbs_REVERSED) ) );
      }
      else
      {
        aLocalShape = SeqVer(1).Oriented(TopAbs_FORWARD);
        BB.Add(NewE, TopoDS::Vertex(aLocalShape));
        aLocalShape = SeqVer(2).Oriented(TopAbs_REVERSED);
        BB.Add(NewE, TopoDS::Vertex(aLocalShape));
        // BB.Add( NewE, TopoDS::Vertex( SeqVer(1).Oriented(TopAbs_FORWARD) ) );
        // BB.Add( NewE, TopoDS::Vertex( SeqVer(2).Oriented(TopAbs_REVERSED) ) );
      }
      NewEdges.Append(NewE);

      firstind++;
      for (i = firstind; i < Seq.Length(); i += 2)
      {
        aLocalShape = anEdge.EmptyCopied();
        NewE        = TopoDS::Edge(aLocalShape);
        // NewE = TopoDS::Edge( anEdge.EmptyCopied() );
        fpar = Seq(i);
        lpar = Seq(i + 1);
        BB.Range(NewE, fpar, lpar);
        // Find vertices
        for (j = 1; j <= Seq2.Length(); j++)
        {
          if (Abs(fpar - Seq2(j)) <= Precision::Confusion())
          {
            break;
          }
        }
        NewE.Orientation(TopAbs_FORWARD);
        TopoDS_Shape aLocalShapeCur = SeqVer(j).Oriented(TopAbs_FORWARD);
        BB.Add(NewE, TopoDS::Vertex(aLocalShapeCur));
        aLocalShapeCur = SeqVer(j + 1).Oriented(TopAbs_REVERSED);
        BB.Add(NewE, TopoDS::Vertex(aLocalShapeCur));
        // BB.Add( NewE, TopoDS::Vertex( SeqVer(j).Oriented(TopAbs_FORWARD) ) );
        // BB.Add( NewE, TopoDS::Vertex( SeqVer(j+1).Oriented(TopAbs_REVERSED) ) );
        NewEdges.Append(NewE);
      }
    }

    i    = Seq.Length();
    fpar = Seq(i);
    lpar = LastPar;
    if (Abs(fpar - lpar) <= Precision::Confusion())
      continue;
    TopoDS_Shape aLocalShape = anEdge.EmptyCopied();
    NewE                     = TopoDS::Edge(aLocalShape);
    // NewE = TopoDS::Edge( anEdge.EmptyCopied() );
    BB.Range(NewE, fpar, lpar);
    NewE.Orientation(TopAbs_FORWARD);
    aLocalShape = SeqVer(SeqVer.Length()).Oriented(TopAbs_FORWARD);
    BB.Add(NewE, TopoDS::Vertex(aLocalShape));
    // BB.Add( NewE, TopoDS::Vertex( SeqVer(SeqVer.Length()).Oriented(TopAbs_FORWARD) ) );
    BB.Add(NewE, Vlast.Oriented(TopAbs_REVERSED));
    NewEdges.Append(NewE);

    // Substitute anEdge by NewEdges
    aSub.Substitute(anEdge, NewEdges);
  }

  // Removing edges connected with missing extremities of seam edges
  TopTools_DataMapIteratorOfDataMapOfShapeShape itve(VEmap);
  for (; itve.More(); itve.Next())
  {
    const TopoDS_Shape& V = itve.Key();
    const TopoDS_Shape& E = itve.Value();
    TopoDS_Shape        W;
    for (i = 1; i <= Eseq.Length(); i++)
    {
      if (E.IsSame(Eseq(i)))
      {
        W = Wseq(i);
        break;
      }
    }
    TopoDS_Shape Etoremove;
    eit.Initialize(W);
    for (; eit.More(); eit.Next())
    {
      TopoDS_Edge CurE = TopoDS::Edge(eit.Value());
      if (CurE.IsSame(E))
        continue;
      TopoDS_Vertex Vfirst, Vlast;
      TopExp::Vertices(CurE, Vfirst, Vlast);
      if (Vfirst.IsSame(V) || Vlast.IsSame(V))
      {
        Etoremove = CurE;
        break;
      }
    }
    if (!Etoremove.IsNull())
    {
      W.Free(Standard_True);
      BB.Remove(W, Etoremove);
    }
  }

  aSub.Build(myShape);
  if (aSub.IsCopied(myShape))
  {
    const TopTools_ListOfShape& listSh = aSub.Copy(myShape);
    if (!listSh.IsEmpty())
      myShape = listSh.First();
  }

  // Reconstruction of wires
  TopTools_ListOfShape                                theCopy;
  TopTools_DataMapIteratorOfDataMapOfShapeListOfShape itww(WWmap);
  for (; itww.More(); itww.Next())
  {
    CurWire = itww.Key();
    theCopy = aSub.Copy(CurWire);
    CurWire = theCopy.First();
    CurWire.Free(Standard_True);
    TopTools_ListIteratorOfListOfShape itl(itww.Value());
    for (; itl.More(); itl.Next())
    {
      TopoDS_Shape aWire = itl.Value();
      CurFace            = WFmap(aWire);
      theCopy            = aSub.Copy(aWire);
      aWire              = theCopy.First();
      // Adjusting period
      TopLoc_Location      L;
      Handle(Geom_Surface) theSurf = BRep_Tool::Surface(TopoDS::Face(CurFace), L);
      eit.Initialize(aWire);
      for (; eit.More(); eit.Next())
      {
        TopoDS_Edge anEdge = TopoDS::Edge(eit.Value());
        gp_Pnt2d    Pfirst, Plast, Pmid;
        BRep_Tool::UVPoints(anEdge, TopoDS::Face(CurFace), Pfirst, Plast);
        BRepAdaptor_Curve2d bc2d(anEdge, TopoDS::Face(CurFace));
        Pmid = bc2d.Value((bc2d.FirstParameter() + bc2d.LastParameter()) / 2.);
        gp_Vec2d         offset;
        Standard_Boolean translate = Standard_False;
        if (Pfirst.X() - 2. * M_PI > Precision::Confusion()
            || Plast.X() - 2. * M_PI > Precision::Confusion()
            || Pmid.X() - 2. * M_PI > Precision::Confusion())
        {
          offset.SetCoord(-2. * M_PI, 0);
          translate = Standard_True;
        }
        if (Pfirst.X() < -Precision::Confusion() || Plast.X() < -Precision::Confusion()
            || Pmid.X() < -Precision::Confusion())
        {
          offset.SetCoord(2. * M_PI, 0);
          translate = Standard_True;
        }
        if (translate)
        {
          const Handle(BRep_TEdge)& TE = *((Handle(BRep_TEdge)*)&anEdge.TShape());
          BRep_ListIteratorOfListOfCurveRepresentation itcr(TE->ChangeCurves());
          Handle(BRep_GCurve)                          GC;

          for (; itcr.More(); itcr.Next())
          {
            GC = Handle(BRep_GCurve)::DownCast(itcr.Value());
            if (!GC.IsNull() && GC->IsCurveOnSurface(theSurf, L))
            {
              Handle(Geom2d_Curve) PC = GC->PCurve();
              PC                      = Handle(Geom2d_Curve)::DownCast(PC->Translated(offset));
              GC->PCurve(PC);
              TE->ChangeCurves().Remove(itcr);
              TE->ChangeCurves().Append(GC);
              break;
            }
          }
        }
      }
      ///////////////////
      eit.Initialize(aWire, Standard_False);
      for (; eit.More(); eit.Next())
      {
        const TopoDS_Shape& anEdge = eit.Value();
        BB.Add(CurWire, anEdge);
      }
      if (aSub.IsCopied(CurFace))
      {
        theCopy = aSub.Copy(CurFace);
        CurFace = theCopy.First();
      }
      CurFace.Free(Standard_True);
      BB.Remove(CurFace, aWire);
    }
  }
}

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

void BRepOffsetAPI_DraftAngle::CorrectVertexTol()
{
  TopTools_MapOfShape anInitVertices, anInitEdges, aNewEdges;
  TopExp_Explorer     anExp(myInitialShape, TopAbs_EDGE);
  for (; anExp.More(); anExp.Next())
  {
    anInitEdges.Add(anExp.Current());
    TopoDS_Iterator anIter(anExp.Current());
    for (; anIter.More(); anIter.Next())
    {
      anInitVertices.Add(anIter.Value());
    }
  }
  //

  BRep_Builder aBB;
  myVtxToReplace.Clear();
  anExp.Init(myShape, TopAbs_EDGE);
  for (; anExp.More(); anExp.Next())
  {
    const TopoDS_Shape& anE = anExp.Current();
    // Skip old (not modified) edges
    if (anInitEdges.Contains(anE))
      continue;
    //
    // Skip processed edges
    if (aNewEdges.Contains(anE))
      continue;
    //
    aNewEdges.Add(anE);
    //
    Standard_Real   anETol = BRep_Tool::Tolerance(TopoDS::Edge(anE));
    TopoDS_Iterator anIter(anE);
    for (; anIter.More(); anIter.Next())
    {
      const TopoDS_Vertex& aVtx = TopoDS::Vertex(anIter.Value());
      if (anInitVertices.Contains(aVtx))
      {
        if (myVtxToReplace.IsBound(aVtx))
        {
          aBB.UpdateVertex(TopoDS::Vertex(myVtxToReplace(aVtx)), anETol + Epsilon(anETol));
        }
        else
        {
          Standard_Real aVTol = BRep_Tool::Tolerance(aVtx);
          if (aVTol < anETol)
          {
            TopoDS_Vertex aNewVtx;
            gp_Pnt        aVPnt = BRep_Tool::Pnt(aVtx);
            aBB.MakeVertex(aNewVtx, aVPnt, anETol + Epsilon(anETol));
            aNewVtx.Orientation(aVtx.Orientation());
            myVtxToReplace.Bind(aVtx, aNewVtx);
          }
        }
      }
      else
      {
        aBB.UpdateVertex(aVtx, anETol + Epsilon(anETol));
      }
    }
  }
  //
  if (myVtxToReplace.IsEmpty())
  {
    return;
  }
  //
  mySubs.Clear();
  TopTools_DataMapIteratorOfDataMapOfShapeShape anIter(myVtxToReplace);
  for (; anIter.More(); anIter.Next())
  {
    mySubs.Replace(anIter.Key(), anIter.Value());
  }
  mySubs.Apply(myShape);
  myShape = mySubs.Value(myShape);
  //
}