[occt.git] / src / ShapeUpgrade / ShapeUpgrade_SplitSurfaceContinuity.cxx

// Created on: 1999-04-14
// Created by: Roman LYGIN
// Copyright (c) 1999-1999 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 <ShapeUpgrade_SplitSurfaceContinuity.ixx>
#include <Geom_BSplineSurface.hxx>
#include <Precision.hxx>
#include <ShapeUpgrade.hxx>
#include <TColGeom_HArray2OfSurface.hxx>
#include <TColStd_HArray1OfInteger.hxx>
#include <Geom_SweptSurface.hxx>
#include <TColStd_HSequenceOfReal.hxx>
#include <Geom_SurfaceOfRevolution.hxx>
#include <ShapeUpgrade_SplitCurve3dContinuity.hxx>
#include <Geom_SurfaceOfLinearExtrusion.hxx>
#include <TColGeom_HArray1OfCurve.hxx>
#include <gp_Ax1.hxx>
#include <Geom_RectangularTrimmedSurface.hxx>
#include <Geom_OffsetSurface.hxx>
#include <ShapeExtend.hxx>
//======================================================================
//function : ShapeUpgrade_SplitSurface
//purpose  : 
//=======================================================================

ShapeUpgrade_SplitSurfaceContinuity::ShapeUpgrade_SplitSurfaceContinuity()
{
  myCriterion = GeomAbs_C1;
  myTolerance = Precision::Confusion();
  
}

//=======================================================================
//function : SetCrierion
//purpose  : 
//=======================================================================

 void ShapeUpgrade_SplitSurfaceContinuity::SetCriterion(const GeomAbs_Shape Criterion)
{
  myCriterion = Criterion;
  switch (myCriterion) {
    default         :
    case GeomAbs_C1 : myCont = 1; break;
    case GeomAbs_C2 : myCont = 2; break;
    case GeomAbs_C3 : myCont = 3; break;
    case GeomAbs_CN : myCont = 4; break;
  }
}

//=======================================================================
//function : SetTolerance
//purpose  : 
//=======================================================================

 void ShapeUpgrade_SplitSurfaceContinuity::SetTolerance(const Standard_Real Tol)
{
  myTolerance = Tol;
}

//=======================================================================
//function : Build
//purpose  : 
//=======================================================================

 void ShapeUpgrade_SplitSurfaceContinuity::Compute(const Standard_Boolean Segment) 
{
  if(!Segment) {
    Standard_Real UF,UL,VF,VL;
    mySurface->Bounds(UF,UL,VF,VL);
    if(!Precision::IsInfinite(UF)) myUSplitValues->SetValue(1,UF);
    if(!Precision::IsInfinite(UL)) myUSplitValues->SetValue(myUSplitValues->Length(),UL);
    if(!Precision::IsInfinite(VF)) myVSplitValues->SetValue(1,VF);
    if(!Precision::IsInfinite(VL)) myVSplitValues->SetValue(myVSplitValues->Length(),VL);
  }
  
  Standard_Real UFirst = myUSplitValues->Value(1);
  Standard_Real ULast  = myUSplitValues->Value(myUSplitValues->Length());
  Standard_Real VFirst = myVSplitValues->Value(1);
  Standard_Real VLast  = myVSplitValues->Value(myVSplitValues->Length());
  Standard_Real precision = Precision::Confusion();
//  if (ShapeUpgrade::Debug()) cout << "SplitSurfaceContinuity::Build" << endl;
  if(mySurface->Continuity() < myCriterion) 
    myStatus = ShapeExtend::EncodeStatus (ShapeExtend_DONE2);
  if (myUSplitValues->Length() >2 || myVSplitValues->Length() >2 )
    myStatus = ShapeExtend::EncodeStatus (ShapeExtend_DONE1);
  
  if (mySurface->IsKind(STANDARD_TYPE(Geom_SurfaceOfRevolution))) {      
    Handle(Geom_SurfaceOfRevolution) Surface = Handle(Geom_SurfaceOfRevolution)::DownCast(mySurface);
    if(Surface->Continuity() >=  myCriterion && myUSplitValues->Length() ==2 && myVSplitValues->Length() ==2 ) {
      return;
    }
    Handle(Geom_Curve) BasCurve = Surface->BasisCurve(); 
    ShapeUpgrade_SplitCurve3dContinuity spc;
    spc.Init(BasCurve,VFirst,VLast);
    spc.SetCriterion(myCriterion);
    spc.SetTolerance(myTolerance);
    spc.SetSplitValues(myVSplitValues);
    spc.Compute();
    myVSplitValues->Clear();
    myVSplitValues->ChangeSequence() = spc.SplitValues()->Sequence();
    if ( spc.Status ( ShapeExtend_DONE1 ) )
      myStatus |= ShapeExtend::EncodeStatus ( ShapeExtend_DONE1 );
    if ( spc.Status ( ShapeExtend_DONE2 ) )
      myStatus |= ShapeExtend::EncodeStatus ( ShapeExtend_DONE2 );
    if ( spc.Status ( ShapeExtend_DONE3 ) )
      myStatus |= ShapeExtend::EncodeStatus ( ShapeExtend_DONE3 );
    return;
  }   
  if (mySurface->IsKind(STANDARD_TYPE(Geom_SurfaceOfLinearExtrusion))) {
    Handle(Geom_SurfaceOfLinearExtrusion) Surface = Handle(Geom_SurfaceOfLinearExtrusion)::DownCast(mySurface);
   if(Surface->Continuity() >=  myCriterion && myUSplitValues->Length() ==2 && myVSplitValues->Length() == 2) {
      return;
    }
    Handle(Geom_Curve) BasCurve = Surface->BasisCurve();
    ShapeUpgrade_SplitCurve3dContinuity spc;
    spc.Init(BasCurve,UFirst,ULast);
    spc.SetCriterion(myCriterion);
    spc.SetTolerance(myTolerance);
    spc.SetSplitValues(myUSplitValues);
    spc.Compute(); 
    myUSplitValues->Clear();
    myUSplitValues->ChangeSequence() = spc.SplitValues()->Sequence();
    if ( spc.Status ( ShapeExtend_DONE1 ) )
      myStatus |= ShapeExtend::EncodeStatus ( ShapeExtend_DONE1 );
    if ( spc.Status ( ShapeExtend_DONE2 ) )
      myStatus |= ShapeExtend::EncodeStatus ( ShapeExtend_DONE2 );
    if ( spc.Status ( ShapeExtend_DONE3 ) ) {
      myStatus |= ShapeExtend::EncodeStatus ( ShapeExtend_DONE3 );
      Handle(Geom_Curve) aNewBascurve = spc.GetCurve();
      Surface->SetBasisCurve(aNewBascurve);
    }
    return;
  }
  
  if (mySurface->IsKind(STANDARD_TYPE(Geom_RectangularTrimmedSurface))) {
    Handle(Geom_RectangularTrimmedSurface) tmp = Handle(Geom_RectangularTrimmedSurface)::DownCast (mySurface);
    if(tmp->Continuity() >=  myCriterion && myUSplitValues->Length() ==2 && myVSplitValues->Length() == 2) {
      return;
    }
    Standard_Real U1,U2,V1,V2;
    tmp->Bounds(U1,U2,V1,V2);
    Handle(Geom_Surface) theSurf = tmp->BasisSurface();
    ShapeUpgrade_SplitSurfaceContinuity sps;
    sps.Init(theSurf,Max(U1,UFirst),Min(U2,ULast),Max(V1,VFirst),Min(V2,VLast));
    sps.SetUSplitValues(myUSplitValues);
    sps.SetVSplitValues(myVSplitValues);
    sps.SetTolerance(myTolerance);
    sps.SetCriterion(myCriterion);
    sps.Compute(Standard_True);
    myUSplitValues->Clear();
    myUSplitValues->ChangeSequence() = sps.USplitValues()->Sequence();
    myVSplitValues->Clear();
    myVSplitValues->ChangeSequence() = sps.VSplitValues()->Sequence();
    myStatus |= sps.myStatus;
    return;
  }
  else if (mySurface->IsKind(STANDARD_TYPE(Geom_OffsetSurface))) {
    GeomAbs_Shape BasCriterion;
    switch (myCriterion) {
      default         :
      case GeomAbs_C1 : BasCriterion = GeomAbs_C2; break;
      case GeomAbs_C2 : BasCriterion = GeomAbs_C3; break;
      case GeomAbs_C3 : //if (ShapeUpgrade::Debug()) cout<<". this criterion is not suitable for a Offset Surface"<<endl;; 
#ifdef DEB
	                cout << "Warning: ShapeUpgrade_SplitSurfaceContinuity: criterion C3 for Offset surface" << endl; 
#endif
      case GeomAbs_CN : BasCriterion = GeomAbs_CN; break;
      
    }
    Handle(Geom_OffsetSurface) tmp = Handle(Geom_OffsetSurface)::DownCast (mySurface);
    Handle(Geom_Surface) theSurf = tmp->BasisSurface();
    if(theSurf->Continuity() >=  BasCriterion && myUSplitValues->Length() ==2 && myVSplitValues->Length() == 2) {
      return;
    }
    ShapeUpgrade_SplitSurfaceContinuity sps;
    sps.Init(theSurf,UFirst,ULast,VFirst,VLast);
    sps.SetUSplitValues(myUSplitValues);
    sps.SetVSplitValues(myVSplitValues);
    sps.SetTolerance(myTolerance);
    sps.SetCriterion(BasCriterion);
    sps.Compute(Standard_True);
    myUSplitValues->Clear();
    myUSplitValues->ChangeSequence() = sps.USplitValues()->Sequence();
    myVSplitValues->Clear();
    myVSplitValues->ChangeSequence() = sps.VSplitValues()->Sequence();
    myStatus |= sps.myStatus;
    return;
  }
  
  Handle(Geom_BSplineSurface) MyBSpline;
  if(mySurface->IsKind(STANDARD_TYPE(Geom_BSplineSurface)))
    MyBSpline = Handle(Geom_BSplineSurface)::DownCast(mySurface->Copy());
  if (MyBSpline.IsNull()) {
//    if (ShapeUpgrade::Debug()) cout<<". "<<" Surface is not a Bspline"<<endl;
    return;
  } 
  if(mySurface->Continuity() >= myCriterion) {
    return;
  }
  
  // it is a BSplineSurface
  Standard_Integer UDeg=MyBSpline->UDegree();
  Standard_Integer VDeg=MyBSpline->VDegree();
  Standard_Integer NbUKnots= MyBSpline->NbUKnots(); 
  Standard_Integer UFirstInd =MyBSpline->FirstUKnotIndex()+1,
  ULastInd = MyBSpline->LastUKnotIndex()-1,
  VFirstInd =MyBSpline->FirstVKnotIndex()+1,
  VLastInd = MyBSpline->LastVKnotIndex()-1;
  Standard_Integer NbVKnots= MyBSpline->NbVKnots();
  
//  if (ShapeUpgrade::Debug()) cout<<". NbUKnots="<<NbUKnots<<endl;
  if (NbUKnots>2) {
    // Only the internal knots are checked.
    Standard_Integer iknot= UFirstInd;
    for(Standard_Integer j =2; j <= myUSplitValues->Length(); j++) {
      ULast =  myUSplitValues->Value(j);
      
      for (; iknot <= ULastInd; iknot++) {
	Standard_Real valknot = MyBSpline->UKnot(iknot);
	if(valknot <= UFirst + precision) continue;
	  if( valknot >= ULast - precision) break;
	Standard_Integer Continuity=UDeg-MyBSpline->UMultiplicity(iknot);
	if (Continuity < myCont) { 
	  // At this knot, the Surface is C0; try to remove Knot.
	  Standard_Integer newMultiplicity=UDeg - myCont;
	  Standard_Boolean corrected = Standard_False;
	  if ( newMultiplicity >= 0 )
	    corrected=MyBSpline->RemoveUKnot(iknot, newMultiplicity, myTolerance);
	  if (corrected && newMultiplicity > 0) {
		Continuity=UDeg-MyBSpline->UMultiplicity(iknot);
		corrected = (Continuity >= myCont);
		}
	  if (corrected) {
	    // at this knot, the continuity is now C1. Nothing else to do.
//	    if (ShapeUpgrade::Debug()) cout<<". Correction at UKnot "<<iknot<<endl;
            // PTV 15.05.2002 decrease iknot and ULastIndex values if knot removed
            if (newMultiplicity ==0) { iknot--; ULastInd--; }
	    myStatus |= ShapeExtend::EncodeStatus ( ShapeExtend_DONE3 );
	  }
	  else {
	    // impossible to force C1 within the tolerance: 
	    // this knot will be a splitting value.
	    Standard_Real u=MyBSpline->UKnot(iknot);
	    myUSplitValues->InsertBefore(j++,u);
	    myNbResultingRow++;
//	    if (ShapeUpgrade::Debug()) cout<<". Splitting at Knot "<<iknot<<endl;
	  }
	}
      }
      UFirst = ULast;
    }
  }
//  if (ShapeUpgrade::Debug()) cout<<". NbVKnots="<<NbVKnots<<endl;
  if (NbVKnots>2) {
    // Only the internal knots are checked.
    Standard_Integer iknot=VFirstInd;
    for(Standard_Integer j1 =2; j1 <= myVSplitValues->Length(); j1++) {
      VLast =  myVSplitValues->Value(j1);
      for (; iknot <= VLastInd; iknot++) {
	Standard_Real valknot = MyBSpline->VKnot(iknot);
	if(valknot <= VFirst + precision) continue;
	if( valknot >= VLast - precision) break;
	Standard_Integer Continuity=VDeg-MyBSpline->VMultiplicity(iknot);
	if (Continuity < myCont) { 
	  // At this knot, the Surface is C0; try to remove Knot.
	  Standard_Integer newMultiplicity=VDeg - myCont;
	  Standard_Boolean corrected = Standard_False;
	  if( newMultiplicity >= 0 )
	    corrected=MyBSpline->RemoveVKnot(iknot, newMultiplicity, myTolerance);
	  if (corrected && newMultiplicity > 0) {
		Continuity=VDeg-MyBSpline->VMultiplicity(iknot);
		corrected = (Continuity >= myCont);
	  }
	  if (corrected ) {
	    // at this knot, the continuity is now Criterion. Nothing else to do.
//	    if (ShapeUpgrade::Debug()) cout<<". Correction at VKnot "<<iknot<<endl;
            // PTV 15.05.2002 decrease iknot and ULastIndex values if knot removed
            if (newMultiplicity ==0) { iknot--; VLastInd--; }
	    myStatus |= ShapeExtend::EncodeStatus ( ShapeExtend_DONE3 );
	  }
	  else {
	    // this knot will be a splitting value.
	    Standard_Real v=MyBSpline->VKnot(iknot);
	    myVSplitValues->InsertBefore(j1++,v);
	    myNbResultingCol++;
//	    if (ShapeUpgrade::Debug()) cout<<". Splitting at Knot "<<iknot<<endl;
	  }
	}
      }
      VFirst = VLast;
    }
  }
  if ( Status ( ShapeExtend_DONE3 ) ) {
    mySurface = MyBSpline;
  }

  if (myUSplitValues->Length() >2 || myVSplitValues->Length() >2 )
    myStatus |= ShapeExtend::EncodeStatus (ShapeExtend_DONE1);
}
Commit	Line	Data
b311480e	1	// Created on: 1999-04-14
	2	// Created by: Roman LYGIN
	3	// Copyright (c) 1999-1999 Matra Datavision
973c2be1	4	// Copyright (c) 1999-2014 OPEN CASCADE SAS
b311480e	5	//
973c2be1	6	// This file is part of Open CASCADE Technology software library.
b311480e	7	//
d5f74e42	8	// This library is free software; you can redistribute it and/or modify it under
d5f74e42	9	// the terms of the GNU Lesser General Public License version 2.1 as published
973c2be1	10	// by the Free Software Foundation, with special exception defined in the file
	11	// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
	12	// distribution for complete text of the license and disclaimer of any warranty.
b311480e	13	//
973c2be1	14	// Alternatively, this file may be used under the terms of Open CASCADE
973c2be1	15	// commercial license or contractual agreement.
7fd59977	16
	17	#include <ShapeUpgrade_SplitSurfaceContinuity.ixx>
	18	#include <Geom_BSplineSurface.hxx>
	19	#include <Precision.hxx>
	20	#include <ShapeUpgrade.hxx>
	21	#include <TColGeom_HArray2OfSurface.hxx>
	22	#include <TColStd_HArray1OfInteger.hxx>
	23	#include <Geom_SweptSurface.hxx>
	24	#include <TColStd_HSequenceOfReal.hxx>
	25	#include <Geom_SurfaceOfRevolution.hxx>
	26	#include <ShapeUpgrade_SplitCurve3dContinuity.hxx>
	27	#include <Geom_SurfaceOfLinearExtrusion.hxx>
	28	#include <TColGeom_HArray1OfCurve.hxx>
	29	#include <gp_Ax1.hxx>
	30	#include <Geom_RectangularTrimmedSurface.hxx>
	31	#include <Geom_OffsetSurface.hxx>
	32	#include <ShapeExtend.hxx>
	33	//======================================================================
	34	//function : ShapeUpgrade_SplitSurface
	35	//purpose :
	36	//=======================================================================
	37
	38	ShapeUpgrade_SplitSurfaceContinuity::ShapeUpgrade_SplitSurfaceContinuity()
	39	{
	40	myCriterion = GeomAbs_C1;
	41	myTolerance = Precision::Confusion();
	42
	43	}
	44
	45	//=======================================================================
	46	//function : SetCrierion
	47	//purpose :
	48	//=======================================================================
	49
	50	void ShapeUpgrade_SplitSurfaceContinuity::SetCriterion(const GeomAbs_Shape Criterion)
	51	{
	52	myCriterion = Criterion;
	53	switch (myCriterion) {
	54	default :
	55	case GeomAbs_C1 : myCont = 1; break;
	56	case GeomAbs_C2 : myCont = 2; break;
	57	case GeomAbs_C3 : myCont = 3; break;
	58	case GeomAbs_CN : myCont = 4; break;
	59	}
	60	}
	61
	62	//=======================================================================
	63	//function : SetTolerance
	64	//purpose :
	65	//=======================================================================
	66
	67	void ShapeUpgrade_SplitSurfaceContinuity::SetTolerance(const Standard_Real Tol)
	68	{
	69	myTolerance = Tol;
	70	}
	71
	72	//=======================================================================
	73	//function : Build
	74	//purpose :
	75	//=======================================================================
	76
	77	void ShapeUpgrade_SplitSurfaceContinuity::Compute(const Standard_Boolean Segment)
	78	{
	79	if(!Segment) {
80	Standard_Real UF,UL,VF,VL;
81	mySurface->Bounds(UF,UL,VF,VL);
82	if(!Precision::IsInfinite(UF)) myUSplitValues->SetValue(1,UF);
83	if(!Precision::IsInfinite(UL)) myUSplitValues->SetValue(myUSplitValues->Length(),UL);
84	if(!Precision::IsInfinite(VF)) myVSplitValues->SetValue(1,VF);
85	if(!Precision::IsInfinite(VL)) myVSplitValues->SetValue(myVSplitValues->Length(),VL);
86	}
87
88	Standard_Real UFirst = myUSplitValues->Value(1);
89	Standard_Real ULast = myUSplitValues->Value(myUSplitValues->Length());
90	Standard_Real VFirst = myVSplitValues->Value(1);
91	Standard_Real VLast = myVSplitValues->Value(myVSplitValues->Length());
92	Standard_Real precision = Precision::Confusion();
93	// if (ShapeUpgrade::Debug()) cout << "SplitSurfaceContinuity::Build" << endl;
94	if(mySurface->Continuity() < myCriterion)
95	myStatus = ShapeExtend::EncodeStatus (ShapeExtend_DONE2);
96	if (myUSplitValues->Length() >2 \|\| myVSplitValues->Length() >2 )
97	myStatus = ShapeExtend::EncodeStatus (ShapeExtend_DONE1);
98
99	if (mySurface->IsKind(STANDARD_TYPE(Geom_SurfaceOfRevolution))) {
100	Handle(Geom_SurfaceOfRevolution) Surface = Handle(Geom_SurfaceOfRevolution)::DownCast(mySurface);
101	if(Surface->Continuity() >= myCriterion && myUSplitValues->Length() ==2 && myVSplitValues->Length() ==2 ) {
102	return;
103	}
104	Handle(Geom_Curve) BasCurve = Surface->BasisCurve();
105	ShapeUpgrade_SplitCurve3dContinuity spc;
106	spc.Init(BasCurve,VFirst,VLast);
107	spc.SetCriterion(myCriterion);
108	spc.SetTolerance(myTolerance);
109	spc.SetSplitValues(myVSplitValues);
110	spc.Compute();
111	myVSplitValues->Clear();
112	myVSplitValues->ChangeSequence() = spc.SplitValues()->Sequence();
113	if ( spc.Status ( ShapeExtend_DONE1 ) )
114	myStatus \|= ShapeExtend::EncodeStatus ( ShapeExtend_DONE1 );
115	if ( spc.Status ( ShapeExtend_DONE2 ) )
116	myStatus \|= ShapeExtend::EncodeStatus ( ShapeExtend_DONE2 );
117	if ( spc.Status ( ShapeExtend_DONE3 ) )
118	myStatus \|= ShapeExtend::EncodeStatus ( ShapeExtend_DONE3 );
119	return;
120	}
121	if (mySurface->IsKind(STANDARD_TYPE(Geom_SurfaceOfLinearExtrusion))) {
122	Handle(Geom_SurfaceOfLinearExtrusion) Surface = Handle(Geom_SurfaceOfLinearExtrusion)::DownCast(mySurface);
123	if(Surface->Continuity() >= myCriterion && myUSplitValues->Length() ==2 && myVSplitValues->Length() == 2) {
124	return;
125	}
126	Handle(Geom_Curve) BasCurve = Surface->BasisCurve();
127	ShapeUpgrade_SplitCurve3dContinuity spc;
128	spc.Init(BasCurve,UFirst,ULast);
129	spc.SetCriterion(myCriterion);
130	spc.SetTolerance(myTolerance);
131	spc.SetSplitValues(myUSplitValues);
132	spc.Compute();
133	myUSplitValues->Clear();
134	myUSplitValues->ChangeSequence() = spc.SplitValues()->Sequence();
135	if ( spc.Status ( ShapeExtend_DONE1 ) )
136	myStatus \|= ShapeExtend::EncodeStatus ( ShapeExtend_DONE1 );
137	if ( spc.Status ( ShapeExtend_DONE2 ) )
138	myStatus \|= ShapeExtend::EncodeStatus ( ShapeExtend_DONE2 );
139	if ( spc.Status ( ShapeExtend_DONE3 ) ) {
140	myStatus \|= ShapeExtend::EncodeStatus ( ShapeExtend_DONE3 );
141	Handle(Geom_Curve) aNewBascurve = spc.GetCurve();
142	Surface->SetBasisCurve(aNewBascurve);
143	}
144	return;
145	}
146
147	if (mySurface->IsKind(STANDARD_TYPE(Geom_RectangularTrimmedSurface))) {
148	Handle(Geom_RectangularTrimmedSurface) tmp = Handle(Geom_RectangularTrimmedSurface)::DownCast (mySurface);
149	if(tmp->Continuity() >= myCriterion && myUSplitValues->Length() ==2 && myVSplitValues->Length() == 2) {
150	return;
151	}
152	Standard_Real U1,U2,V1,V2;
153	tmp->Bounds(U1,U2,V1,V2);
154	Handle(Geom_Surface) theSurf = tmp->BasisSurface();
155	ShapeUpgrade_SplitSurfaceContinuity sps;
156	sps.Init(theSurf,Max(U1,UFirst),Min(U2,ULast),Max(V1,VFirst),Min(V2,VLast));
157	sps.SetUSplitValues(myUSplitValues);
158	sps.SetVSplitValues(myVSplitValues);
159	sps.SetTolerance(myTolerance);
160	sps.SetCriterion(myCriterion);
161	sps.Compute(Standard_True);
162	myUSplitValues->Clear();
163	myUSplitValues->ChangeSequence() = sps.USplitValues()->Sequence();
164	myVSplitValues->Clear();
165	myVSplitValues->ChangeSequence() = sps.VSplitValues()->Sequence();
166	myStatus \|= sps.myStatus;
167	return;
168	}
169	else if (mySurface->IsKind(STANDARD_TYPE(Geom_OffsetSurface))) {
170	GeomAbs_Shape BasCriterion;
171	switch (myCriterion) {
172	default :
173	case GeomAbs_C1 : BasCriterion = GeomAbs_C2; break;
174	case GeomAbs_C2 : BasCriterion = GeomAbs_C3; break;
175	case GeomAbs_C3 : //if (ShapeUpgrade::Debug()) cout<<". this criterion is not suitable for a Offset Surface"<<endl;;
176	#ifdef DEB
177	cout << "Warning: ShapeUpgrade_SplitSurfaceContinuity: criterion C3 for Offset surface" << endl;
178	#endif
179	case GeomAbs_CN : BasCriterion = GeomAbs_CN; break;
180
181	}
182	Handle(Geom_OffsetSurface) tmp = Handle(Geom_OffsetSurface)::DownCast (mySurface);
183	Handle(Geom_Surface) theSurf = tmp->BasisSurface();
184	if(theSurf->Continuity() >= BasCriterion && myUSplitValues->Length() ==2 && myVSplitValues->Length() == 2) {
185	return;
186	}
187	ShapeUpgrade_SplitSurfaceContinuity sps;
188	sps.Init(theSurf,UFirst,ULast,VFirst,VLast);
189	sps.SetUSplitValues(myUSplitValues);
190	sps.SetVSplitValues(myVSplitValues);
191	sps.SetTolerance(myTolerance);
192	sps.SetCriterion(BasCriterion);
193	sps.Compute(Standard_True);
194	myUSplitValues->Clear();
195	myUSplitValues->ChangeSequence() = sps.USplitValues()->Sequence();
196	myVSplitValues->Clear();
197	myVSplitValues->ChangeSequence() = sps.VSplitValues()->Sequence();
198	myStatus \|= sps.myStatus;
199	return;
200	}
201
202	Handle(Geom_BSplineSurface) MyBSpline;
203	if(mySurface->IsKind(STANDARD_TYPE(Geom_BSplineSurface)))
204	MyBSpline = Handle(Geom_BSplineSurface)::DownCast(mySurface->Copy());
205	if (MyBSpline.IsNull()) {
206	// if (ShapeUpgrade::Debug()) cout<<". "<<" Surface is not a Bspline"<<endl;
207	return;
208	}
209	if(mySurface->Continuity() >= myCriterion) {
210	return;
211	}
212
213	// it is a BSplineSurface
214	Standard_Integer UDeg=MyBSpline->UDegree();
215	Standard_Integer VDeg=MyBSpline->VDegree();
216	Standard_Integer NbUKnots= MyBSpline->NbUKnots();
217	Standard_Integer UFirstInd =MyBSpline->FirstUKnotIndex()+1,
218	ULastInd = MyBSpline->LastUKnotIndex()-1,
219	VFirstInd =MyBSpline->FirstVKnotIndex()+1,
220	VLastInd = MyBSpline->LastVKnotIndex()-1;
221	Standard_Integer NbVKnots= MyBSpline->NbVKnots();
222
223	// if (ShapeUpgrade::Debug()) cout<<". NbUKnots="<<NbUKnots<<endl;
224	if (NbUKnots>2) {
225	// Only the internal knots are checked.
226	Standard_Integer iknot= UFirstInd;
227	for(Standard_Integer j =2; j <= myUSplitValues->Length(); j++) {
228	ULast = myUSplitValues->Value(j);
229
230	for (; iknot <= ULastInd; iknot++) {
231	Standard_Real valknot = MyBSpline->UKnot(iknot);
232	if(valknot <= UFirst + precision) continue;
233	if( valknot >= ULast - precision) break;
234	Standard_Integer Continuity=UDeg-MyBSpline->UMultiplicity(iknot);
235	if (Continuity < myCont) {
236	// At this knot, the Surface is C0; try to remove Knot.
237	Standard_Integer newMultiplicity=UDeg - myCont;
238	Standard_Boolean corrected = Standard_False;
239	if ( newMultiplicity >= 0 )
240	corrected=MyBSpline->RemoveUKnot(iknot, newMultiplicity, myTolerance);
241	if (corrected && newMultiplicity > 0) {
242	Continuity=UDeg-MyBSpline->UMultiplicity(iknot);
243	corrected = (Continuity >= myCont);
244	}
245	if (corrected) {
246	// at this knot, the continuity is now C1. Nothing else to do.
247	// if (ShapeUpgrade::Debug()) cout<<". Correction at UKnot "<<iknot<<endl;
248	// PTV 15.05.2002 decrease iknot and ULastIndex values if knot removed
249	if (newMultiplicity ==0) { iknot--; ULastInd--; }
250	myStatus \|= ShapeExtend::EncodeStatus ( ShapeExtend_DONE3 );
251	}
252	else {
253	// impossible to force C1 within the tolerance:
254	// this knot will be a splitting value.
255	Standard_Real u=MyBSpline->UKnot(iknot);
256	myUSplitValues->InsertBefore(j++,u);
257	myNbResultingRow++;
258	// if (ShapeUpgrade::Debug()) cout<<". Splitting at Knot "<<iknot<<endl;
259	}
260	}
261	}
262	UFirst = ULast;
263	}
264	}
265	// if (ShapeUpgrade::Debug()) cout<<". NbVKnots="<<NbVKnots<<endl;
266	if (NbVKnots>2) {
267	// Only the internal knots are checked.
268	Standard_Integer iknot=VFirstInd;
269	for(Standard_Integer j1 =2; j1 <= myVSplitValues->Length(); j1++) {
270	VLast = myVSplitValues->Value(j1);
271	for (; iknot <= VLastInd; iknot++) {
272	Standard_Real valknot = MyBSpline->VKnot(iknot);
273	if(valknot <= VFirst + precision) continue;
274	if( valknot >= VLast - precision) break;
275	Standard_Integer Continuity=VDeg-MyBSpline->VMultiplicity(iknot);
276	if (Continuity < myCont) {
277	// At this knot, the Surface is C0; try to remove Knot.
278	Standard_Integer newMultiplicity=VDeg - myCont;
279	Standard_Boolean corrected = Standard_False;
280	if( newMultiplicity >= 0 )
281	corrected=MyBSpline->RemoveVKnot(iknot, newMultiplicity, myTolerance);
282	if (corrected && newMultiplicity > 0) {
283	Continuity=VDeg-MyBSpline->VMultiplicity(iknot);
284	corrected = (Continuity >= myCont);
285	}
286	if (corrected ) {
287	// at this knot, the continuity is now Criterion. Nothing else to do.
288	// if (ShapeUpgrade::Debug()) cout<<". Correction at VKnot "<<iknot<<endl;
289	// PTV 15.05.2002 decrease iknot and ULastIndex values if knot removed
290	if (newMultiplicity ==0) { iknot--; VLastInd--; }
291	myStatus \|= ShapeExtend::EncodeStatus ( ShapeExtend_DONE3 );
292	}
293	else {
294	// this knot will be a splitting value.
295	Standard_Real v=MyBSpline->VKnot(iknot);
296	myVSplitValues->InsertBefore(j1++,v);
297	myNbResultingCol++;
298	// if (ShapeUpgrade::Debug()) cout<<". Splitting at Knot "<<iknot<<endl;
299	}
300	}
301	}
302	VFirst = VLast;
303	}
304	}
305	if ( Status ( ShapeExtend_DONE3 ) ) {
306	mySurface = MyBSpline;
307	}
308
309	if (myUSplitValues->Length() >2 \|\| myVSplitValues->Length() >2 )
310	myStatus \|= ShapeExtend::EncodeStatus (ShapeExtend_DONE1);
311	}
312
313
314
315