// File:      IntTools_LineConstructor.cxx
// Created:   Tue Feb  7 10:12:45 1995
// Author:    Jacques GOUSSARD
// Copyright: OPEN CASCADE 1995

#include <IntTools_LineConstructor.ixx>

#include <GeomInt_LineTool.hxx>
#include <GeomInt_SequenceOfParameterAndOrientation.hxx>
#include <GeomInt_ParameterAndOrientation.hxx>

#include <IntPatch_Point.hxx>
#include <IntPatch_GLine.hxx>
#include <IntPatch_WLine.hxx>
#include <IntPatch_ALine.hxx>
#include <IntSurf_Transition.hxx>
#include <TopAbs_Orientation.hxx>


#include <Precision.hxx>

#include <gp_Pnt2d.hxx>

#include <Adaptor2d_HCurve2d.hxx>

#include <GeomAdaptor_HSurface.hxx>
#include <Standard_ConstructionError.hxx>
#include <IntSurf_Quadric.hxx>
#include <IntSurf_PntOn2S.hxx>
#include <ElCLib.hxx>
#include <GeomAbs_SurfaceType.hxx>
//
#include <TColStd_IndexedMapOfInteger.hxx>


//=======================================================================
//function : Recadre
//purpose  : 
//=======================================================================
static void Recadre(const Handle(GeomAdaptor_HSurface)& myHS1,
                    const Handle(GeomAdaptor_HSurface)& myHS2,
                    Standard_Real& u1,
                    Standard_Real& v1,
                    Standard_Real& u2,
                    Standard_Real& v2)
{ 
  Standard_Boolean myHS1IsUPeriodic,myHS1IsVPeriodic;
  const GeomAbs_SurfaceType typs1 = myHS1->GetType();
  switch (typs1)
  { 
    case GeomAbs_Cylinder:
    case GeomAbs_Cone:
    case GeomAbs_Sphere: 
    { 
      myHS1IsUPeriodic = Standard_True;
      myHS1IsVPeriodic = Standard_False;
      break;
    }
    case GeomAbs_Torus:
    {
      myHS1IsUPeriodic = myHS1IsVPeriodic = Standard_True;
      break;
    }
    default:
    {
      //-- Case of periodic biparameters is processed upstream
      myHS1IsUPeriodic = myHS1IsVPeriodic = Standard_False;
      break;
    }
  }
  Standard_Boolean myHS2IsUPeriodic,myHS2IsVPeriodic;
  const GeomAbs_SurfaceType typs2 = myHS2->GetType();
  switch (typs2)
  { 
    case GeomAbs_Cylinder:
    case GeomAbs_Cone:
    case GeomAbs_Sphere: 
    { 
      myHS2IsUPeriodic = Standard_True;
      myHS2IsVPeriodic = Standard_False;
      break;
    }
    case GeomAbs_Torus:
    {
      myHS2IsUPeriodic = myHS2IsVPeriodic = Standard_True;
      break;
    }
    default:
    {
      //-- Case of periodic biparameters is processed upstream
      myHS2IsUPeriodic = myHS2IsVPeriodic = Standard_False;
      break;
    }
  }
  if(myHS1IsUPeriodic) {
    const Standard_Real lmf = PI+PI; //-- myHS1->UPeriod();
    const Standard_Real f = myHS1->FirstUParameter();
    const Standard_Real l = myHS1->LastUParameter();
    while(u1 < f) { u1+=lmf; } 
    while(u1 > l) { u1-=lmf; }
  }
  if(myHS1IsVPeriodic) {
    const Standard_Real lmf = PI+PI; //-- myHS1->VPeriod(); 
    const Standard_Real f = myHS1->FirstVParameter();
    const Standard_Real l = myHS1->LastVParameter();
    while(v1 < f) { v1+=lmf; } 
    while(v1 > l) { v1-=lmf; }
  }
  if(myHS2IsUPeriodic) { 
    const Standard_Real lmf = PI+PI; //-- myHS2->UPeriod();
    const Standard_Real f = myHS2->FirstUParameter();
    const Standard_Real l = myHS2->LastUParameter();
    while(u2 < f) { u2+=lmf; } 
    while(u2 > l) { u2-=lmf; }
  }
  if(myHS2IsVPeriodic) { 
    const Standard_Real lmf = PI+PI; //-- myHS2->VPeriod();
    const Standard_Real f = myHS2->FirstVParameter();
    const Standard_Real l = myHS2->LastVParameter();
    while(v2 < f) { v2+=lmf; } 
    while(v2 > l) { v2-=lmf; }
  }
}


//=======================================================================
//function : Parameters
//purpose  : 
//=======================================================================
static void Parameters(const Handle(GeomAdaptor_HSurface)& myHS1,
                       const Handle(GeomAdaptor_HSurface)& myHS2,
                       const gp_Pnt& Ptref,
                       Standard_Real& U1,
                       Standard_Real& V1,
                       Standard_Real& U2,
                       Standard_Real& V2)
{
  IntSurf_Quadric quad1,quad2;
  switch (myHS1->Surface().GetType())
  {
    case GeomAbs_Plane:    quad1.SetValue(myHS1->Surface().Plane()); break;
    case GeomAbs_Cylinder: quad1.SetValue(myHS1->Surface().Cylinder()); break;
    case GeomAbs_Cone:     quad1.SetValue(myHS1->Surface().Cone()); break;
    case GeomAbs_Sphere:   quad1.SetValue(myHS1->Surface().Sphere()); break;
    default: Standard_ConstructionError::Raise("IntTools_LineConstructor::Parameters");
  }
  switch (myHS2->Surface().GetType())
  {
    case GeomAbs_Plane:    quad2.SetValue(myHS2->Surface().Plane()); break;
    case GeomAbs_Cylinder: quad2.SetValue(myHS2->Surface().Cylinder()); break;
    case GeomAbs_Cone:     quad2.SetValue(myHS2->Surface().Cone()); break;
    case GeomAbs_Sphere:   quad2.SetValue(myHS2->Surface().Sphere()); break;
    default: Standard_ConstructionError::Raise("IntTools_LineConstructor::Parameters");
  }
  quad1.Parameters(Ptref,U1,V1);
  quad2.Parameters(Ptref,U2,V2);
}


//=======================================================================
//function : Perform
//purpose  : 
//=======================================================================
void IntTools_LineConstructor::Perform(const Handle(IntPatch_Line)& L)
{
  Standard_Integer i,nbvtx;
  Standard_Real firstp,lastp;
  const Standard_Real Tol = Precision::PConfusion() * 35.0;
  
  const IntPatch_IType typl = L->ArcType();
  if(typl == IntPatch_Analytic)
  {
    Standard_Real u1,v1,u2,v2;
    Handle(IntPatch_ALine)& ALine =  *((Handle(IntPatch_ALine) *)&L);
    seqp.Clear();
    nbvtx = GeomInt_LineTool::NbVertex(L);
    for(i=1;i<nbvtx;i++)
    {
      firstp = GeomInt_LineTool::Vertex(L,i).ParameterOnLine();
      lastp =  GeomInt_LineTool::Vertex(L,i+1).ParameterOnLine();
      if(firstp!=lastp)
      {
	const Standard_Real pmid = (firstp+lastp)*0.5;
	const gp_Pnt Pmid = ALine->Value(pmid);
	Parameters(myHS1,myHS2,Pmid,u1,v1,u2,v2);
	Recadre(myHS1,myHS2,u1,v1,u2,v2);
	const TopAbs_State in1 = myDom1->Classify(gp_Pnt2d(u1,v1),Tol);
	if(in1 !=  TopAbs_OUT) {
	  const TopAbs_State in2 = myDom2->Classify(gp_Pnt2d(u2,v2),Tol);
	  if(in2 != TopAbs_OUT) { 
	    seqp.Append(firstp);
	    seqp.Append(lastp);
	  }
	}
      }
    }
    done = Standard_True;
    return;
  }
  else if(typl == IntPatch_Walking)
  {
    Standard_Real u1,v1,u2,v2;
    Handle(IntPatch_WLine)& WLine =  *((Handle(IntPatch_WLine) *)&L);
    seqp.Clear();
    nbvtx = GeomInt_LineTool::NbVertex(L);
    for(i=1;i<nbvtx;i++)
    { 
      firstp = GeomInt_LineTool::Vertex(L,i).ParameterOnLine();
      lastp =  GeomInt_LineTool::Vertex(L,i+1).ParameterOnLine();
      if(firstp!=lastp)
      { 
	if(lastp != firstp+1)
        {
	  const Standard_Integer pmid = (Standard_Integer )( (firstp+lastp)/2);
	  const IntSurf_PntOn2S& Pmid = WLine->Point(pmid);
	  Pmid.Parameters(u1,v1,u2,v2);
	  Recadre(myHS1,myHS2,u1,v1,u2,v2);
	  const TopAbs_State in1 = myDom1->Classify(gp_Pnt2d(u1,v1),Tol);
	  if(in1 !=  TopAbs_OUT) {   
	    const TopAbs_State in2 = myDom2->Classify(gp_Pnt2d(u2,v2),Tol);
	    if(in2 != TopAbs_OUT) {   
	      seqp.Append(firstp);
	      seqp.Append(lastp);
	    }
	  }
	}
	else
        {
	  const IntSurf_PntOn2S& Pfirst = WLine->Point((Standard_Integer)(firstp));
	  Pfirst.Parameters(u1,v1,u2,v2);
	  Recadre(myHS1,myHS2,u1,v1,u2,v2);
	  TopAbs_State in1 = myDom1->Classify(gp_Pnt2d(u1,v1),Tol);
	  if(in1 !=  TopAbs_OUT) {  //-- !=ON donne Pb 
	    TopAbs_State in2 = myDom2->Classify(gp_Pnt2d(u2,v2),Tol);
	    if(in2 != TopAbs_OUT) { //-- !=ON  
	      const IntSurf_PntOn2S& Plast = WLine->Point((Standard_Integer)(lastp));
	      Plast.Parameters(u1,v1,u2,v2);
	      Recadre(myHS1,myHS2,u1,v1,u2,v2);
	      in1 = myDom1->Classify(gp_Pnt2d(u1,v1),Tol);
	      if(in1 !=  TopAbs_OUT) {  //-- !=ON donne Pb 
		in2 = myDom2->Classify(gp_Pnt2d(u2,v2),Tol);
		if(in2 != TopAbs_OUT) {
		  seqp.Append(firstp);
		  seqp.Append(lastp);
		}
	      }
	    }
	  }
	  
	}
      }
    }
    //XX
    //                                             904/L7 
    //
    //     The One resulting curve consists of 7 segments that are 
    // connected between each other.
    //     The aim of the block is to reject these segments and have
    // one segment instead of 7. 
    //     The other reason to do that is value of TolReached3D=49.
    //     Why -? It is not known yet. 
    //                                             PKV 22.Apr.2002
    //
    const GeomAbs_SurfaceType aST1 = myHS1->Surface().GetType();
    const GeomAbs_SurfaceType aST2 = myHS2->Surface().GetType();
    if ((aST1==GeomAbs_Plane && aST2==GeomAbs_SurfaceOfExtrusion) || 
	(aST2==GeomAbs_Plane && aST1==GeomAbs_SurfaceOfExtrusion))
    {
      TColStd_IndexedMapOfInteger aMap;
      TColStd_SequenceOfReal aSeqTmp;
      
      Standard_Integer aNb, anIndex, aNbTmp, jx;
      
      aNb=seqp.Length();
      for(i=1; i<=aNb;++i) {
	lastp =seqp(i);
	anIndex=(Standard_Integer)lastp;
	if (!aMap.Contains(anIndex)){
	  aMap.Add(anIndex);
	  aSeqTmp.Append(lastp);
	}
	else {
	  aNbTmp=aSeqTmp.Length();
	  aSeqTmp.Remove(aNbTmp);
	}
      }
      //
      seqp.Clear();
      //
      aNb=aSeqTmp.Length()/2;
      for(i=1; i<=aNb;++i) {
	jx=2*i;
	firstp=aSeqTmp(jx-1);
	lastp =aSeqTmp(jx);
	seqp.Append(firstp);
	seqp.Append(lastp);
      }
    }
    ////XX
    done = Standard_True;
    return;
  }
  else if (typl != IntPatch_Restriction)
  { 
    Standard_Real u1,v1,u2,v2;
    Handle(IntPatch_GLine)& GLine =  *((Handle(IntPatch_GLine) *)&L);
    seqp.Clear();
    nbvtx = GeomInt_LineTool::NbVertex(L);
    Standard_Boolean intrvtested = Standard_False;
    for(i=1;i<nbvtx;i++)
    { 
      firstp = GeomInt_LineTool::Vertex(L,i).ParameterOnLine();
      lastp =  GeomInt_LineTool::Vertex(L,i+1).ParameterOnLine();
      if(Abs(firstp-lastp)>Precision::PConfusion())
      {
	intrvtested = Standard_True;
	const Standard_Real pmid = (firstp+lastp)*0.5;
	gp_Pnt Pmid;
        switch (typl)
        {
          case IntPatch_Lin:       Pmid = ElCLib::Value(pmid,GLine->Line()); break;
          case IntPatch_Circle:    Pmid = ElCLib::Value(pmid,GLine->Circle()); break;
          case IntPatch_Ellipse:   Pmid = ElCLib::Value(pmid,GLine->Ellipse()); break;
          case IntPatch_Hyperbola: Pmid = ElCLib::Value(pmid,GLine->Hyperbola()); break;
          case IntPatch_Parabola:  Pmid = ElCLib::Value(pmid,GLine->Parabola()); break;
          default: /* Do nothing */ break;
        }
	Parameters(myHS1,myHS2,Pmid,u1,v1,u2,v2);
	Recadre(myHS1,myHS2,u1,v1,u2,v2);
	const TopAbs_State in1 = myDom1->Classify(gp_Pnt2d(u1,v1),Tol);
	if(in1 !=  TopAbs_OUT) { 
	  const TopAbs_State in2 = myDom2->Classify(gp_Pnt2d(u2,v2),Tol);
	  if(in2 != TopAbs_OUT) { 
	    seqp.Append(firstp);
	    seqp.Append(lastp);
	  }
	}
      }
    }

    if(typl == IntPatch_Circle || typl == IntPatch_Ellipse)
    { 
      firstp = GeomInt_LineTool::Vertex(L,nbvtx).ParameterOnLine();
      lastp  = PI + PI + GeomInt_LineTool::Vertex(L,1).ParameterOnLine();
      const Standard_Real cadrinf = GeomInt_LineTool::FirstParameter(L);
      const Standard_Real cadrsup = GeomInt_LineTool::LastParameter(L);
      Standard_Real acadr = (firstp+lastp)*0.5;
      while(acadr < cadrinf) { acadr+=PI+PI; }
      while(acadr > cadrsup) { acadr-=PI+PI; } 
      if(acadr>=cadrinf && acadr<=cadrsup)
      { 
	if(Abs(firstp-lastp)>Precision::PConfusion())
        {
	  intrvtested = Standard_True;
	  const Standard_Real pmid = (firstp+lastp)*0.5;
	  gp_Pnt Pmid;
	  if (typl == IntPatch_Circle)
	    Pmid = ElCLib::Value(pmid,GLine->Circle());
	  else
	    Pmid = ElCLib::Value(pmid,GLine->Ellipse());
	  Parameters(myHS1,myHS2,Pmid,u1,v1,u2,v2);
	  Recadre(myHS1,myHS2,u1,v1,u2,v2);
	  const TopAbs_State in1 = myDom1->Classify(gp_Pnt2d(u1,v1),Tol);
	  if(in1 !=  TopAbs_OUT) { 
	    const TopAbs_State in2 = myDom2->Classify(gp_Pnt2d(u2,v2),Tol);
	    if(in2 != TopAbs_OUT) { 
	      seqp.Append(firstp);
	      seqp.Append(lastp);
	    }
	  }
	}
      }
    }      
    if (!intrvtested) {
      // Keep a priori. A point 2d on each
      // surface is required to make the decision. Will be done in the caller
      seqp.Append(GeomInt_LineTool::FirstParameter(L));
      seqp.Append(GeomInt_LineTool::LastParameter(L));
    }
    //
    //modified by NIZNHY-PKV Mon Jan 21 17:02:12 2002 f
    //
    // Unite neighbouring intervals if it's possible.
    // It is valid when 3D intersection curve does not go through 
    // the apex on surface. So for the moment we take into account
    // Plane and Cylinder - surfaces that do not contain an apex.
    //                      by NIZNHY-PKV Tue Jan 22 14:00:51 2002

    const GeomAbs_SurfaceType aST1 = myHS1->Surface().GetType();
    const GeomAbs_SurfaceType aST2 = myHS2->Surface().GetType();
    if ((aST1==GeomAbs_Plane || aST1==GeomAbs_Cylinder) &&
	(aST2==GeomAbs_Plane || aST2==GeomAbs_Cylinder))
    {
      if(typl == IntPatch_Circle || typl == IntPatch_Ellipse)
      {
	Standard_Integer aNbParts = seqp.Length()/2;
	//
	if (aNbParts > 1)
        {
	  Standard_Integer j, i2, j2;
	  Standard_Real aFi = seqp(1), aLi, aFj, aLj, aF, aL;
	  TColStd_SequenceOfReal aSeq;
	  aSeq.Append(aFi);
	  for (i=1; i<aNbParts; ++i)
          {
	    j=i+1;
	    i2=2*i;
	    j2=2*j;
	    
	    aFi=seqp(i2-1);
	    aLi=seqp(i2);

	    aFj=seqp(j2-1);
	    aLj=seqp(j2);
	    
	    if (fabs (aFj-aLi) < Tol)
            {
	      aL=aLj;
	    }
	    else
            {
	      aL=aLi;
	      aSeq.Append(aL);
	      aF=aFj;
	      aSeq.Append(aF);
	    }
	  }
	  aSeq.Append(aLj);
	  //
	  seqp.Clear();
	  aNbParts=aSeq.Length();
	  for (i=1; i<=aNbParts; ++i)
          {
	    aF=aSeq(i);
	    seqp.Append(aF);
	  }
	}
      }
    }
    //modified by NIZNHY-PKV Mon Jan 21 17:02:17 2002 t
    //
    done =Standard_True;
    return;
  }

  done = Standard_False;
  seqp.Clear();
  nbvtx = GeomInt_LineTool::NbVertex(L);
  if (nbvtx == 0) { // Keep a priori. Point 2d is required on each
                    // surface to make the decision. Will be done in the caller
    seqp.Append(GeomInt_LineTool::FirstParameter(L));
    seqp.Append(GeomInt_LineTool::LastParameter(L));
    done = Standard_True;
    return;
  }

  GeomInt_SequenceOfParameterAndOrientation seqpss;
  TopAbs_Orientation or1=TopAbs_FORWARD,or2=TopAbs_FORWARD;

  for (i=1; i<=nbvtx; i++)
  {
    const IntPatch_Point& thevtx = GeomInt_LineTool::Vertex(L,i);
    const Standard_Real prm = thevtx.ParameterOnLine();
    if (thevtx.IsOnDomS1())
    {
      switch (thevtx.TransitionLineArc1().TransitionType())
      {
        case IntSurf_In:        or1 = TopAbs_FORWARD; break;  
        case IntSurf_Out:       or1 = TopAbs_REVERSED; break;  
        case IntSurf_Touch:     or1 = TopAbs_INTERNAL; break;  
        case IntSurf_Undecided: or1 = TopAbs_INTERNAL; break;  
      }
    }
    else
      or1 = TopAbs_INTERNAL;
    
    if (thevtx.IsOnDomS2())
    {
      switch (thevtx.TransitionLineArc2().TransitionType())
      {
        case IntSurf_In:        or2 = TopAbs_FORWARD; break;
        case IntSurf_Out:       or2 = TopAbs_REVERSED; break;
        case IntSurf_Touch:     or2 = TopAbs_INTERNAL; break;
        case IntSurf_Undecided: or2 = TopAbs_INTERNAL; break;
      }
    }
    else
      or2 = TopAbs_INTERNAL;

    const Standard_Integer nbinserted = seqpss.Length();
    Standard_Boolean inserted = Standard_False;
    for (Standard_Integer j=1; j<=nbinserted;j++)
    {
      if (Abs(prm-seqpss(j).Parameter()) <= Tol)
      {
	// accumulate
	GeomInt_ParameterAndOrientation& valj = seqpss.ChangeValue(j);
	if (or1 != TopAbs_INTERNAL) {
	  if (valj.Orientation1() != TopAbs_INTERNAL) {
	    if (or1 != valj.Orientation1()) {
	      valj.SetOrientation1(TopAbs_INTERNAL);
	    }
	  }
	  else {
	    valj.SetOrientation1(or1);
	  }
	}
	
	if (or2 != TopAbs_INTERNAL) {
	  if (valj.Orientation2() != TopAbs_INTERNAL) {
	    if (or2 != valj.Orientation2()) {
	      valj.SetOrientation2(TopAbs_INTERNAL);
	    }
	  }
	  else {
	    valj.SetOrientation2(or2);
	  }
	}	  
	inserted = Standard_True;
	break;
      }
      
      if (prm < seqpss(j).Parameter()-Tol ) {
	// insert before position j
	seqpss.InsertBefore(j,GeomInt_ParameterAndOrientation(prm,or1,or2));
	inserted = Standard_True;
	break;
      }
      
    }
    if (!inserted) {
      seqpss.Append(GeomInt_ParameterAndOrientation(prm,or1,or2));
    }
  }

  // determine the state at the beginning of line
  Standard_Boolean trim = Standard_False;
  Standard_Boolean dansS1 = Standard_False;
  Standard_Boolean dansS2 = Standard_False;

  nbvtx = seqpss.Length();
  for (i=1; i<= nbvtx; i++)
  {
    or1 = seqpss(i).Orientation1();
    if (or1 != TopAbs_INTERNAL)
    {
      trim = Standard_True;
      dansS1 = (or1 != TopAbs_FORWARD);
      break;
    }
  }
  
  if (i > nbvtx)
  {
    Standard_Real U,V;
    for (i=1; i<=GeomInt_LineTool::NbVertex(L); i++ )
    {
      if (!GeomInt_LineTool::Vertex(L,i).IsOnDomS1() )
      {
	GeomInt_LineTool::Vertex(L,i).ParametersOnS1(U,V);
	gp_Pnt2d PPCC(U,V);
	if (myDom1->Classify(PPCC,Tol) == TopAbs_OUT) {
	  done = Standard_True;
	  return;
	}
        break;
      }
    }
    dansS1 = Standard_True; // Keep in doubt
  }

  for (i=1; i<= nbvtx; i++)
  {
    or2 = seqpss(i).Orientation2();
    if (or2 != TopAbs_INTERNAL)
    {
      trim = Standard_True;
      dansS2 = (or2 != TopAbs_FORWARD);
      break;
    }
  }
  
  if (i > nbvtx)
  {
    Standard_Real U,V;
    for (i=1; i<=GeomInt_LineTool::NbVertex(L); i++ )
    {
      if (!GeomInt_LineTool::Vertex(L,i).IsOnDomS2() )
      {
	GeomInt_LineTool::Vertex(L,i).ParametersOnS2(U,V);
	if (myDom2->Classify(gp_Pnt2d(U,V),Tol) == TopAbs_OUT) {
	  done = Standard_True;
	  return;
	}
        break;
      }
    }
    dansS2 = Standard_True; //  Keep in doubt
  }

  if (!trim) { // necessarily dansS1 == dansS2 == Standard_True
    seqp.Append(GeomInt_LineTool::FirstParameter(L));
    seqp.Append(GeomInt_LineTool::LastParameter(L));
    done = Standard_True;
    return;
  }

  // sequence seqpss is peeled to create valid ends 
  // and store them in seqp(2*i+1) and seqp(2*i+2)

  Standard_Real thefirst = GeomInt_LineTool::FirstParameter(L);
  Standard_Real thelast = GeomInt_LineTool::LastParameter(L);
  firstp = thefirst;

  for (i=1; i<=nbvtx; i++)
  {
    or1 = seqpss(i).Orientation1(); 
    or2 = seqpss(i).Orientation2(); 
    if (dansS1 && dansS2)
    {
      if (or1 == TopAbs_REVERSED)
	dansS1 = Standard_False;
      /*else if (or1 == TopAbs_FORWARD) {
      }*/
      if (or2 == TopAbs_REVERSED)
	dansS2 = Standard_False;
      /*else if (or2 == TopAbs_FORWARD) {
      }*/
      if (!dansS1 || !dansS2)
      {
	lastp = seqpss(i).Parameter();
	Standard_Real stofirst = Max(firstp, thefirst);
	Standard_Real stolast  = Min(lastp,  thelast) ;

	if (stolast > stofirst) {
	  seqp.Append(stofirst);
	  seqp.Append(stolast);
	}
	if (lastp > thelast)
	  break;
      }
    }
    else
    {
      if (dansS1)
      {
	if (or1 == TopAbs_REVERSED)
	  dansS1 = Standard_False;
	/*else if (or1 == TopAbs_FORWARD) {
	}*/
      }
      else
      {
	if (or1 == TopAbs_FORWARD)
	  dansS1 = Standard_True;
	/*else if (or1 == TopAbs_REVERSED) {
	}*/
      }
      if (dansS2)
      {
	if (or2 == TopAbs_REVERSED)
	  dansS2 = Standard_False;
	/*else if (or2 == TopAbs_FORWARD) {
	}*/
      }
      else
      {
	if (or2 == TopAbs_FORWARD)
	  dansS2 = Standard_True;
	/*else if (or2 == TopAbs_REVERSED) {
	}*/
      }
      if (dansS1 && dansS2)
	firstp = seqpss(i).Parameter();
    }
  }

  // finally to add
  if (dansS1 && dansS2)
  {
    lastp  = thelast;
    firstp = Max(firstp,thefirst);
    if (lastp > firstp) {
      seqp.Append(firstp);
      seqp.Append(lastp);
    }
  }
  done = Standard_True;
}


//=======================================================================
//function : PeriodicLine
//purpose  : 
//=======================================================================
void IntTools_LineConstructor::PeriodicLine (const Handle(IntPatch_Line)& L) const
{
  const IntPatch_IType typl = L->ArcType();
  if (typl != IntPatch_Circle && typl != IntPatch_Ellipse)
    return;

  const Standard_Real Tol = Precision::PConfusion();
  Handle(IntPatch_GLine) glin = Handle(IntPatch_GLine)::DownCast(L);
  Standard_Integer i,j,nbvtx = glin->NbVertex();
  for (i=1; i<=nbvtx; i++)
  {
    IntPatch_Point thevtx = glin->Vertex(i);
    const Standard_Real prm = thevtx.ParameterOnLine();
    Standard_Boolean changevtx = Standard_False;
    if (thevtx.IsOnDomS1() || thevtx.IsOnDomS2())
    {
      for (j=1; j<=nbvtx; j++)
      {
        if (j!=i)
        {
          const IntPatch_Point& thevtxbis = glin->Vertex(j);
          const Standard_Real prmbis = thevtxbis.ParameterOnLine();
          if (Abs(prm-prmbis) <= Tol)
          {
            Standard_Real u,v;
            gp_Pnt2d p2d;
            if (thevtx.IsOnDomS1() && thevtxbis.IsOnDomS1() &&
                thevtxbis.TransitionLineArc1().TransitionType()==IntSurf_In)
            {
              p2d = thevtx.ArcOnS1()->Value(thevtx.ParameterOnArc1());
              u = p2d.X(); v = p2d.Y();
              p2d = thevtxbis.ArcOnS1()->Value(thevtxbis.ParameterOnArc1());
              if (Abs(u-p2d.X()) > Tol || Abs(v-p2d.Y()) > Tol)
              {
                changevtx = Standard_True;
                break;
              }
            }
            if (thevtx.IsOnDomS2() && thevtxbis.IsOnDomS2() &&
                thevtxbis.TransitionLineArc2().TransitionType()==IntSurf_In)
            {
              p2d = thevtx.ArcOnS2()->Value(thevtx.ParameterOnArc2());
              u = p2d.X(); v = p2d.Y();
              p2d = thevtxbis.ArcOnS2()->Value(thevtxbis.ParameterOnArc2());
              if (Abs(u-p2d.X()) > Tol || Abs(v-p2d.Y()) > Tol)
              {
                changevtx = Standard_True;
                break;
              }
            }
          }
        }
      }
    }
    if (changevtx) {
      thevtx.SetParameter(prm + 2.*PI);
      glin->Replace(i,thevtx);
    }
  }
}