src/BRepFill/BRepFill_TrimEdgeTool.cxx

// Created on: 1995-04-24
// Created by: Bruno DUMORTIER
// 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 <Bisector_Bisec.hxx>
#include <Bisector_BisecAna.hxx>
#include <BRep_Tool.hxx>
#include <BRepFill_TrimEdgeTool.hxx>
#include <ElCLib.hxx>
#include <Geom2d_CartesianPoint.hxx>
#include <Geom2d_Curve.hxx>
#include <Geom2d_Geometry.hxx>
#include <Geom2d_TrimmedCurve.hxx>
#include <Geom2dAPI_ProjectPointOnCurve.hxx>
#include <Geom2dInt_GInter.hxx>
#include <Geom_Curve.hxx>
#include <Geom_TrimmedCurve.hxx>
#include <GeomProjLib.hxx>
#include <gp_Pnt.hxx>
#include <gp_Pnt2d.hxx>
#include <IntRes2d_IntersectionPoint.hxx>
#include <IntRes2d_IntersectionSegment.hxx>
#include <Precision.hxx>
#include <StdFail_NotDone.hxx>
#include <TopLoc_Location.hxx>
#include <TopoDS.hxx>
#include <TopoDS_Edge.hxx>
#include <TopoDS_Vertex.hxx>
#include <TopExp.hxx>
#include <BRepAdaptor_Curve.hxx>

#ifdef OCCT_DEBUG
//#define DRAW
#ifdef DRAW
#include <DrawTrSurf.hxx>
#include <DBRep.hxx>
#include <Geom2d_Point.hxx>
static Standard_Boolean Affich       = Standard_False;
static Standard_Boolean AffichInt    = Standard_False;
static Standard_Integer intind       = 0;
#endif
#endif


//=======================================================================
//function : SimpleExpression
//purpose  :
//=======================================================================

static void SimpleExpression (const Bisector_Bisec&        B,
  Handle(Geom2d_Curve)&  Bis)
{
  Bis = B.Value();

  Handle(Standard_Type) BT = Bis->DynamicType();
  if (BT == STANDARD_TYPE(Geom2d_TrimmedCurve)) {
    Handle(Geom2d_TrimmedCurve) TrBis
      = Handle(Geom2d_TrimmedCurve)::DownCast(Bis);
    Handle(Geom2d_Curve) BasBis = TrBis->BasisCurve();
    BT = BasBis->DynamicType();
    if (BT == STANDARD_TYPE(Bisector_BisecAna)) {
      Bis = Handle(Bisector_BisecAna)::DownCast(BasBis)->Geom2dCurve();
      Bis = new Geom2d_TrimmedCurve (Bis,
        TrBis->FirstParameter(),
        TrBis->LastParameter());
    }
  }
}


//=======================================================================
//function : BRepFill_TrimEdgeTool
//purpose  :
//=======================================================================

BRepFill_TrimEdgeTool::BRepFill_TrimEdgeTool()
{
}


//=======================================================================
//function : BRepFill_TrimEdgeTool
//purpose  :
//=======================================================================

BRepFill_TrimEdgeTool::BRepFill_TrimEdgeTool
  (const Bisector_Bisec& Bisec,
  const Handle(Geom2d_Geometry)& S1,
  const Handle(Geom2d_Geometry)& S2,
  const Standard_Real   Offset) :
myOffset(Offset),
  myBisec(Bisec)
{
  isPoint1 = (S1->DynamicType() == STANDARD_TYPE(Geom2d_CartesianPoint));
  isPoint2 = (S2->DynamicType() == STANDARD_TYPE(Geom2d_CartesianPoint));

  // return geometries of shapes.
  //  Standard_Real f,l;
  if (isPoint1) {
    myP1 = Handle(Geom2d_Point)::DownCast(S1)->Pnt2d();
  }
  else {
    myC1 = Handle(Geom2d_Curve)::DownCast(S1);
#ifdef DRAW
    if ( Affich) {
      //POP pour NT
      char* myC1name = "myC1";
      DrawTrSurf::Set(myC1name,myC1);
      //      DrawTrSurf::Set("myC1",myC1);
    }
#endif
  }
  if (isPoint2) {
    myP2 = Handle(Geom2d_Point)::DownCast(S2)->Pnt2d();
  }
  else {
    myC2 = Handle(Geom2d_Curve)::DownCast(S2);
#ifdef DRAW
    if ( Affich) {
      char* myC2name = "myC2";
      DrawTrSurf::Set(myC2name,myC2);
      //      DrawTrSurf::Set("myC2",myC2);
    }
#endif
  }
  // return the simple expression of the bissectrice
  Handle(Geom2d_Curve) Bis;
  SimpleExpression(myBisec, Bis);
  myBis = Geom2dAdaptor_Curve(Bis);
#ifdef DRAW
  if ( Affich) {
    char* myBisname = "myBis";
    DrawTrSurf::Set(myBisname,Bis);
  }
#endif

}

//=======================================================================
//function : Bubble
//purpose  : Order the sequence of points by increasing x.
//=======================================================================

static void Bubble(TColgp_SequenceOfPnt& Seq)
{
  Standard_Boolean Invert = Standard_True;
  Standard_Integer NbPoints = Seq.Length();
  while (Invert) {
    Invert = Standard_False;
    for ( Standard_Integer i = 1; i < NbPoints; i++) {
      gp_Pnt P1 = Seq.Value(i);
      gp_Pnt P2 = Seq.Value(i+1);
      if (P2.X()<P1.X())  {
        Seq.Exchange(i,i+1);
        Invert = Standard_True;
      }
    }
  }
}


//=======================================================================
//function : EvalParameters
//purpose  :
//=======================================================================

static void EvalParameters(const Geom2dAdaptor_Curve& Bis,
  const Geom2dAdaptor_Curve& AC,
  TColgp_SequenceOfPnt& Params)
{
  Geom2dInt_GInter Intersector;
  Standard_Real Tol = Precision::Confusion();
  //  Standard_Real TolC = 1.e-9;

  Geom2dAdaptor_Curve CBis(Bis);
  Geom2dAdaptor_Curve CAC (AC);

  //Intersector = Geom2dInt_GInter(CBis, CAC, TolC, Tol);
  Intersector = Geom2dInt_GInter(CAC, CBis, Tol, Tol);

  Standard_Integer NbPoints, NbSegments;
  Standard_Real U1, U2;
  gp_Pnt P;

  if ( !Intersector.IsDone()) {
    throw StdFail_NotDone("BRepFill_TrimSurfaceTool::IntersectWith");
  }

  NbPoints = Intersector.NbPoints();

  if (NbPoints > 0) {
    for ( Standard_Integer i = 1; i <= NbPoints; i++) {
      U1 = Intersector.Point(i).ParamOnSecond();
      U2 = Intersector.Point(i).ParamOnFirst();
      P = gp_Pnt(U1,U2,0.);
      Params.Append(P);
    }

  }

  NbSegments = Intersector.NbSegments();

  if (NbSegments > 0) {
    IntRes2d_IntersectionSegment Seg;
    for ( Standard_Integer i = 1; i <= NbSegments; i++) {
      Seg = Intersector.Segment(i);
      U1  = Seg.FirstPoint().ParamOnSecond();
      Standard_Real Ulast = Seg.LastPoint().ParamOnSecond();
      if ( Abs(U1    - CBis.FirstParameter()) <= Tol &&
        Abs(Ulast - CBis.LastParameter())  <= Tol    ) {
          P = gp_Pnt(U1,Seg.FirstPoint().ParamOnFirst(),0.);
          Params.Append(P);
          P = gp_Pnt(Ulast,Seg.LastPoint().ParamOnFirst(),0.);
          Params.Append(P);
      }
      else {
        U1 += Seg.LastPoint().ParamOnSecond();
        U1 /= 2.;
        U2  = Seg.FirstPoint().ParamOnFirst();
        U2 += Seg.LastPoint().ParamOnFirst();
        U2 /= 2.;
        P = gp_Pnt(U1,U2,0.);
        Params.Append(P);
      }
    }
  }

  // Order the sequence by growing parameter on the bissectrice.
  Bubble( Params);
}

static void EvalParametersBis(const Geom2dAdaptor_Curve& Bis,
  const Geom2dAdaptor_Curve& AC,
  TColgp_SequenceOfPnt& Params,
  const Standard_Real Tol)
{
  Geom2dInt_GInter Intersector;
  Standard_Real TolC = Tol;

  Geom2dAdaptor_Curve CBis(Bis);
  Geom2dAdaptor_Curve CAC (AC);

  Intersector = Geom2dInt_GInter(CAC, CBis, TolC, Tol);

  Standard_Integer NbPoints, NbSegments;
  Standard_Real U1, U2;
  gp_Pnt P;

  if ( !Intersector.IsDone()) {
    throw StdFail_NotDone("BRepFill_TrimSurfaceTool::IntersectWith");
  }

  NbPoints = Intersector.NbPoints();

  if (NbPoints > 0) {
    for ( Standard_Integer i = 1; i <= NbPoints; i++) {
      U1 = Intersector.Point(i).ParamOnSecond();
      U2 = Intersector.Point(i).ParamOnFirst();
      P = gp_Pnt(U1,U2,0.);
      Params.Append(P);
    }

  }

  NbSegments = Intersector.NbSegments();

  if (NbSegments > 0) {
    IntRes2d_IntersectionSegment Seg;
    for ( Standard_Integer i = 1; i <= NbSegments; i++) {
      Seg = Intersector.Segment(i);
      U1  = Seg.FirstPoint().ParamOnSecond();
      Standard_Real Ulast = Seg.LastPoint().ParamOnSecond();
      if ( Abs(U1    - CBis.FirstParameter()) <= Tol &&
        Abs(Ulast - CBis.LastParameter())  <= Tol    ) {
          P = gp_Pnt(U1,Seg.FirstPoint().ParamOnFirst(),0.);
          Params.Append(P);
          P = gp_Pnt(Ulast,Seg.LastPoint().ParamOnFirst(),0.);
          Params.Append(P);
      }
      else {
        U1 += Seg.LastPoint().ParamOnSecond();
        U1 /= 2.;
        U2  = Seg.FirstPoint().ParamOnFirst();
        U2 += Seg.LastPoint().ParamOnFirst();
        U2 /= 2.;
        P = gp_Pnt(U1,U2,0.);
        Params.Append(P);
      }
    }
  }

  // Order the sequence by parameter growing on the bissectrice.
  Bubble( Params);
}


//=======================================================================
//function : IntersectWith
//purpose  :
//=======================================================================

void BRepFill_TrimEdgeTool::IntersectWith(const TopoDS_Edge& Edge1,
                                          const TopoDS_Edge& Edge2,
                                          const TopoDS_Shape& InitShape1,
                                          const TopoDS_Shape& InitShape2,
                                          const TopoDS_Vertex& End1,
                                          const TopoDS_Vertex& End2,
                                          const GeomAbs_JoinType theJoinType,
                                          const Standard_Boolean IsOpenResult,
                                          TColgp_SequenceOfPnt& Params)
{
  Params.Clear();

  // return curves associated to edges.
  TopLoc_Location L;
  Standard_Real   f,l;
  Handle(Geom_Surface) Surf;

  Handle(Geom2d_Curve) C1;
  BRep_Tool::CurveOnSurface(Edge1,C1,Surf,L,f,l);
  Geom2dAdaptor_Curve AC1(C1,f,l);

  Handle(Geom2d_Curve) C2;
  BRep_Tool::CurveOnSurface(Edge2,C2,Surf,L,f,l);
  Geom2dAdaptor_Curve AC2(C2,f,l);

#ifdef DRAW
  if ( AffichInt) {
    f = AC1.FirstParameter();
    l = AC1.LastParameter();
    char name[32];
    sprintf(name,"C1_%d", ++intind);
    DrawTrSurf::Set(name, new Geom2d_TrimmedCurve(C1,f,l));
    f = AC2.FirstParameter();
    l = AC2.LastParameter();
    sprintf(name,"C2_%d", intind);
    DrawTrSurf::Set(name, new Geom2d_TrimmedCurve(C2,f,l));
    f = myBis.FirstParameter();
    l = myBis.LastParameter();
    sprintf(name,"BIS%d", intind);
    DrawTrSurf::Set(name, new Geom2d_TrimmedCurve(myBis.Curve(),f,l));
    sprintf(name,"E1_%d", intind);
    DBRep::Set(name, Edge1);
    sprintf(name,"E2_%d", intind);
    DBRep::Set(name, Edge2);

  }
#endif

  // Calculate intersection
  TColgp_SequenceOfPnt Points2;
  gp_Pnt PSeq;

  EvalParameters (myBis,AC1,Params);
  EvalParameters (myBis,AC2,Points2);


  Standard_Integer SeanceDeRattrapage=0;
  Standard_Real TolInit= 1.e-9;
  Standard_Integer nn = 7;

  if((AC1.GetType() != GeomAbs_Circle && AC1.GetType() != GeomAbs_Line) ||
    (AC2.GetType() != GeomAbs_Circle && AC2.GetType() != GeomAbs_Line)) {

      TolInit = 1.e-8;
      nn = 6;
  }

  if(Params.IsEmpty() && Points2.IsEmpty())
  {
    //Check, may be there are no intersections at all
    // for case myBis == Line
    if(myBis.GetType() == GeomAbs_Line)
    {
      Standard_Real dmax = TolInit;
      Standard_Integer n = 0;
      while(n < nn)
      {
        dmax *= 10.0;
        ++n;
      }
      dmax *= dmax;
      //
      gp_Lin2d anL = myBis.Line();
      Standard_Boolean isFar1 = Standard_True;
      Standard_Boolean isFar2 = Standard_True;
      gp_Pnt2d aP;
      //
      Standard_Real d = RealLast();
      AC1.D0(AC1.FirstParameter(), aP);
      Standard_Real par = ElCLib::Parameter(anL, aP);
      if(par >= myBis.FirstParameter() && par <= myBis.LastParameter())
      {
        d = anL.SquareDistance(aP);
      }
      AC1.D0(AC1.LastParameter(), aP);
      par = ElCLib::Parameter(anL, aP);
      if(par >= myBis.FirstParameter() && par <= myBis.LastParameter())
      {
        d = Min(anL.SquareDistance(aP), d);
      }
      isFar1 = d > dmax;
      //
      d = RealLast();
      AC2.D0(AC2.FirstParameter(), aP);
      par = ElCLib::Parameter(anL, aP);
      if(par >= myBis.FirstParameter() && par <= myBis.LastParameter())
      {
        d = anL.SquareDistance(aP);
      }
      AC2.D0(AC2.LastParameter(), aP);
      par = ElCLib::Parameter(anL, aP);
      if(par >= myBis.FirstParameter() && par <= myBis.LastParameter())
      {
        d = Min(anL.SquareDistance(aP), d);
      }
      isFar2 = d > dmax;
      //
      if(isFar1 && isFar2)
      {
        return;
      }
    }
  }

  while (     SeanceDeRattrapage < nn // TolInit <= 0.01
    && ( Points2.Length() != Params.Length() ||
    (Points2.Length() == 0 && Params.Length() == 0) ) ) {

#ifdef OCCT_DEBUG
      std::cout << "BRepFill_TrimEdgeTool: incoherent intersection. Try with a greater tolerance" << std::endl;
#endif

      Params.Clear();
      Points2.Clear();

      TolInit*=10.0;

      EvalParametersBis(myBis,AC1,Params,TolInit);
      EvalParametersBis(myBis,AC2,Points2,TolInit);
      SeanceDeRattrapage++;
  }

#ifdef OCCT_DEBUG
  if(SeanceDeRattrapage != 0) std::cout << "SeanceDeRattrapage = " << SeanceDeRattrapage << std::endl;
  if(SeanceDeRattrapage == nn) {
    std::cout << "BRepFill_TrimEdgeTool: incoherent intersection" << std::endl;
  }
#endif


  if(Params.Length() == 0 && Points2.Length() == 1) {

    //std::cout << "Params.Length() == 0 && Points2.Length() == 1" << std::endl;
    Standard_Real dmin, dmax = 0.25*myOffset*myOffset;
    Standard_Real tBis = Points2(1).X();
    gp_Pnt2d PBis = myBis.Value(tBis);

    Standard_Real t = AC1.FirstParameter();
    gp_Pnt2d PC = AC1.Value(t);
    dmin = PC.SquareDistance(PBis);
    gp_Pnt P(tBis, t, 0.);
    if(dmin < dmax)
    {
      Params.Append(P);
    }

    t = AC1.LastParameter();
    PC = AC1.Value(t);
    Standard_Real dmin1 = PC.SquareDistance(PBis);
    if(dmin > dmin1 && dmin1 < dmax ) {
      P.SetY(t);
      if(Params.IsEmpty())
        Params.Append(P);
      else
        Params.SetValue(1,P);
    }
  }
  else if(Params.Length() == 1 && Points2.Length() == 0) {

    //std::cout << "Params.Length() == 1 && Points2.Length() == 0" << std::endl;
    Standard_Real dmin, dmax = 0.25*myOffset*myOffset;
    Standard_Real tBis = Params(1).X();
    gp_Pnt2d PBis = myBis.Value(tBis);

    Standard_Real t = AC2.FirstParameter();
    gp_Pnt2d PC = AC2.Value(t);
    dmin = PC.SquareDistance(PBis);
    gp_Pnt P(tBis, t, 0.);
    if(dmin < dmax)
    {
      Points2.Append(P);
    }

    t = AC2.LastParameter();
    PC = AC2.Value(t);
    Standard_Real dmin1 = PC.SquareDistance(PBis);
    if(dmin > dmin1 && dmin1 < dmax ) {
      P.SetY(t);
      if(Points2.IsEmpty())
        Points2.Append(P);
      else
        Points2.SetValue(1,P);
    }
  }

  // small manipulation to remove incorrect intersections:
  // return only common intersections (same parameter
  // on the bissectrice.).
  // The tolerance can be eventually changed.

  gp_Pnt P1,P2;
  Standard_Real Tol = 4 * 100 * Precision::PConfusion();
  Standard_Integer i = 1;
  Standard_Integer NbPoints = Params.Length();

  if(NbPoints == 1 && Points2.Length() == 1) {
    //std::cout << "NbPoints == 1 && Points2.Length() == 1" << std::endl;
    for ( i = 1; i <= NbPoints; i++) {
      PSeq = Params(i);
      PSeq.SetZ((Points2.Value(i)).Y());
      Params.SetValue(i,PSeq);
    }
    return;
  }

  i = 1;
  while ( i <= Min( Params.Length(), Points2.Length())) {
    P1 = Params(i);
    P2 = Points2(i);
    Standard_Real P1xP2x=Abs( P1.X() - P2.X());

    if ( P1xP2x > Tol ) {
#ifdef OCCT_DEBUG
      std::cout << "BRepFill_TrimEdgeTool: no same parameter on the bissectrice" << std::endl;
#endif
      if(P1xP2x>TolInit) {
#ifdef OCCT_DEBUG
        std::cout << "BRepFill_TrimEdgeTool: Continue somehow" << std::endl;
#endif
        i++;
      }
      else {
        if ( P1.X() < P2.X()) Params.Remove(i);
        else                  Points2.Remove(i);
      }
    }
    else i++;
  }

  if ( Params.Length() > Points2.Length()) {
    Params.Remove(Points2.Length()+1, Params.Length());
  }
  else if ( Params.Length() < Points2.Length()) {
    Points2.Remove(Params.Length()+1, Points2.Length());
  }

  NbPoints = Params.Length();

  //Now we define: if there are more than one point of intersection
  //is it Ok ?
  Standard_Real init_fpar = RealFirst(), init_lpar = RealLast();
  if (NbPoints > 1 &&
      theJoinType == GeomAbs_Intersection &&
      InitShape1.ShapeType() != TopAbs_VERTEX &&
      InitShape2.ShapeType() != TopAbs_VERTEX)
  {
    //definition of initial first and last parameters:
    //this is inverse procedure to extension of parameters
    //(see BRepFill_OffsetWire, function MakeOffset, case of Circle)
    const TopoDS_Edge& InitEdge1 = TopoDS::Edge(InitShape1);
    Standard_Boolean ToExtendFirstPar = Standard_True;
    Standard_Boolean ToExtendLastPar  = Standard_True;
    if (IsOpenResult)
    {
      TopoDS_Vertex V1, V2;
      TopExp::Vertices(InitEdge1, V1, V2);
      if (V1.IsSame(End1) ||
          V1.IsSame(End2))
        ToExtendFirstPar = Standard_False;
      if (V2.IsSame(End1) ||
          V2.IsSame(End2))
        ToExtendLastPar  = Standard_False;
    }
    BRepAdaptor_Curve IC1(InitEdge1);
    if (IC1.GetType() == GeomAbs_Circle)
    {
      Standard_Real Delta = 2*M_PI - IC1.LastParameter() + IC1.FirstParameter();
      if (ToExtendFirstPar && ToExtendLastPar)
        init_fpar = AC1.FirstParameter() + Delta/2;
      else if (ToExtendFirstPar)
        init_fpar = AC1.FirstParameter() + Delta;
      else if (ToExtendLastPar)
        init_fpar = AC1.FirstParameter();
      init_lpar = init_fpar + IC1.LastParameter() - IC1.FirstParameter();
    }
  }


  if (NbPoints > 1 && theJoinType == GeomAbs_Intersection)
  {
    //Remove all vertices with non-minimal parameter
    //if they are out of initial range
    Standard_Integer imin = 1;
    for (i = 2; i <= NbPoints; i++)
      if (Params(i).X() < Params(imin).X())
        imin = i;

    TColgp_SequenceOfPnt ParamsCopy = Params;
    TColgp_SequenceOfPnt Points2Copy = Points2;
    Params.Clear();
    Points2.Clear();
    for (i = 1; i <= ParamsCopy.Length(); i++)
      if (imin == i ||
          (ParamsCopy(i).Y() >= init_fpar && ParamsCopy(i).Y() <= init_lpar))
      {
        Params.Append(ParamsCopy(i));
        Points2.Append(Points2Copy(i));
      }

    /*
    gp_Pnt Pnt1 = Params(imin);
    gp_Pnt Pnt2 = Points2(imin);
    Params.Clear();
    Points2.Clear();
    Params.Append(Pnt1);
    Points2.Append(Pnt2);
    */
  }

  NbPoints = Params.Length();
  for ( i = 1; i <= NbPoints; i++) {
    PSeq = Params(i);
    PSeq.SetZ((Points2.Value(i)).Y());
    Params.SetValue(i,PSeq);
  }
}

//=======================================================================
//function : AddOrConfuse
//purpose  : the first or the last point of the bissectrice is on the
//           parallel if it was not found in the intersections,
//           it is projected on parallel lines and added in the parameters
//=======================================================================

void BRepFill_TrimEdgeTool::AddOrConfuse(const Standard_Boolean  Start,
  const TopoDS_Edge&      Edge1,
  const TopoDS_Edge&      Edge2,
  TColgp_SequenceOfPnt&   Params)
  const
{
  Standard_Boolean  ToProj = Standard_True;
  gp_Pnt2d          PBis;
  Standard_Real     Tol = 10*Precision::Confusion();

  // return curves associated to edges.
  TopLoc_Location L;
  Standard_Real   f,l;
  Handle(Geom_Surface) Surf;

  Handle(Geom2d_Curve) C1;
  BRep_Tool::CurveOnSurface(Edge1,C1,Surf,L,f,l);
  Geom2dAdaptor_Curve AC1(C1,f,l);


  if (Start) PBis = myBis.Value(myBis.FirstParameter());
  else       PBis = myBis.Value(myBis.LastParameter ());

  // Test if the end of the bissectrice is in the set of intersection points.
  if (!Params.IsEmpty()) {
    gp_Pnt2d P;
    if (Start) P = AC1.Value(Params.First().Y());
    else       P = AC1.Value(Params.Last ().Y());
    ToProj     = !PBis.IsEqual(P,Tol);
  }

  if (ToProj) {
#ifdef OCCT_DEBUG
    std::cout << " project extremity bissectrice on parallel."<<std::endl;
#endif

    // Project point on parallels and add in Params

    Standard_Real f2,l2;
    Handle(Geom2d_Curve) C2;
    BRep_Tool::CurveOnSurface(Edge2,C2,Surf,L,f2,l2);

    Geom2dAPI_ProjectPointOnCurve Projector1(PBis,C1,f,l);
    Geom2dAPI_ProjectPointOnCurve Projector2(PBis,C2,f2,l2);

    if (Projector1.NbPoints() == 0) {
#ifdef OCCT_DEBUG
      std::cout << "Failed projection in BRepFill_TrimEdgeTool::AddOrConfuse"<<std::endl;
#endif
      return;
    }
    if (!Projector1.NearestPoint().IsEqual(PBis,Tol)) {
#ifdef OCCT_DEBUG
      std::cout <<"Incorrect solution in BRepFill_TrimEdgeTool::AddOrConfuse"<<std::endl;
#endif
      return;
    }
    if (Projector2.NbPoints() == 0) {
#ifdef OCCT_DEBUG
      std::cout << "Failed projection in BRepFill_TrimEdgeTool::AddOrConfuse"<<std::endl;
#endif
      return;
    }
    if (!Projector2.NearestPoint().IsEqual(PBis,Tol)) {
#ifdef OCCT_DEBUG
      std::cout <<" Mauvaisesolution dans BRepFill_TrimEdgeTool::AddOrConfuse"<<std::endl;
#endif
      return;
    }
    gp_Pnt PInt (0,
      Projector1.LowerDistanceParameter(),
      Projector2.LowerDistanceParameter());
    if (Start) {
      PInt.SetX (myBis.FirstParameter());
      Params.Prepend(PInt);
    }
    else {
      PInt.SetX (myBis.LastParameter());
      Params.Append(PInt);
    }
  }
}

//=======================================================================
//function : IsInside
//purpose  :
//=======================================================================

Standard_Boolean BRepFill_TrimEdgeTool::IsInside(const gp_Pnt2d& P) const
{
  //  Modified by Sergey KHROMOV - Fri Sep 27 11:43:12 2002 Begin
  //   Standard_Real Dist;
  Standard_Real Dist = RealLast();
  //  Modified by Sergey KHROMOV - Fri Sep 27 11:43:12 2002 End
  if (isPoint1)
    Dist = P.Distance(myP1);
  else if (isPoint2)
    Dist = P.Distance(myP2);
  else {
    Geom2dAPI_ProjectPointOnCurve Projector(P,myC1);
    if (Projector.NbPoints() > 0) {
      Dist = Projector.LowerDistance();
    }
    //  Modified by Sergey KHROMOV - Fri Sep 27 11:43:43 2002 Begin
    //     else {
    //       gp_Pnt2d PF = myC1->Value(myC1->FirstParameter());
    //       gp_Pnt2d PL = myC1->Value(myC1->LastParameter());
    //       Dist = Min (P.Distance(PF),P.Distance(PL));
    //     }

    // Check of distances between P and first and last point of the first curve
    // should be performed in any case, despite of the results of projection.
    gp_Pnt2d      PF       = myC1->Value(myC1->FirstParameter());
    gp_Pnt2d      PL       = myC1->Value(myC1->LastParameter());
    Standard_Real aDistMin = Min (P.Distance(PF),P.Distance(PL));

    if (Dist > aDistMin)
      Dist = aDistMin;
    //  Modified by Sergey KHROMOV - Fri Sep 27 11:43:44 2002 End
  }

  //  return (Dist < Abs(myOffset);
  // return (Dist < Abs(myOffset) + Precision::Confusion());
  return (Dist < Abs(myOffset) - Precision::Confusion());
}