// Created on: 1995-06-06
// Created by: Jean Yves LEBEY
// 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.

#ifndef _BRepApprox_TheComputeLineOfApprox_HeaderFile
#define _BRepApprox_TheComputeLineOfApprox_HeaderFile

#include <Standard.hxx>
#include <Standard_DefineAlloc.hxx>
#include <Standard_Handle.hxx>

#include <AppParCurves_MultiBSpCurve.hxx>
#include <Approx_ParametrizationType.hxx>
#include <TColStd_HArray1OfReal.hxx>
#include <TColStd_HArray1OfInteger.hxx>
#include <AppParCurves_HArray1OfConstraintCouple.hxx>
#include <Standard_Integer.hxx>
#include <AppParCurves_Constraint.hxx>
#include <math_Vector.hxx>
#include <TColStd_Array1OfReal.hxx>
#include <TColStd_Array1OfInteger.hxx>
class BRepApprox_TheMultiLineOfApprox;
class BRepApprox_TheMultiLineToolOfApprox;
class BRepApprox_MyBSplGradientOfTheComputeLineOfApprox;
class BRepApprox_BSpParLeastSquareOfMyBSplGradientOfTheComputeLineOfApprox;
class BRepApprox_BSpParFunctionOfMyBSplGradientOfTheComputeLineOfApprox;
class BRepApprox_BSpGradient_BFGSOfMyBSplGradientOfTheComputeLineOfApprox;
class BRepApprox_MyGradientbisOfTheComputeLineOfApprox;
class BRepApprox_ParLeastSquareOfMyGradientbisOfTheComputeLineOfApprox;
class BRepApprox_ResConstraintOfMyGradientbisOfTheComputeLineOfApprox;
class BRepApprox_ParFunctionOfMyGradientbisOfTheComputeLineOfApprox;
class BRepApprox_Gradient_BFGSOfMyGradientbisOfTheComputeLineOfApprox;
class AppParCurves_MultiBSpCurve;
class AppParCurves_MultiCurve;

class BRepApprox_TheComputeLineOfApprox
{
public:
  DEFINE_STANDARD_ALLOC

  //! The MultiLine <Line> will be approximated until tolerances
  //! will be reached.
  //! The approximation will be done from degreemin to degreemax
  //! with a cutting if the corresponding boolean is True.
  //! If <Squares> is True, the computation will be done with
  //! no iteration at all.
  //!
  //! The multiplicities of the internal knots is set by
  //! default.
  Standard_EXPORT BRepApprox_TheComputeLineOfApprox(
    const BRepApprox_TheMultiLineOfApprox& Line,
    const Standard_Integer                 degreemin       = 4,
    const Standard_Integer                 degreemax       = 8,
    const Standard_Real                    Tolerance3d     = 1.0e-3,
    const Standard_Real                    Tolerance2d     = 1.0e-6,
    const Standard_Integer                 NbIterations    = 5,
    const Standard_Boolean                 cutting         = Standard_True,
    const Approx_ParametrizationType       parametrization = Approx_ChordLength,
    const Standard_Boolean                 Squares         = Standard_False);

  //! The MultiLine <Line> will be approximated until tolerances
  //! will be reached.
  //! The approximation will be done from degreemin to degreemax
  //! with a cutting if the corresponding boolean is True.
  //! If <Squares> is True, the computation will be done with
  //! no iteration at all.
  Standard_EXPORT BRepApprox_TheComputeLineOfApprox(
    const BRepApprox_TheMultiLineOfApprox& Line,
    const math_Vector&                     Parameters,
    const Standard_Integer                 degreemin    = 4,
    const Standard_Integer                 degreemax    = 8,
    const Standard_Real                    Tolerance3d  = 1.0e-03,
    const Standard_Real                    Tolerance2d  = 1.0e-06,
    const Standard_Integer                 NbIterations = 5,
    const Standard_Boolean                 cutting      = Standard_True,
    const Standard_Boolean                 Squares      = Standard_False);

  //! Initializes the fields of the algorithm.
  Standard_EXPORT BRepApprox_TheComputeLineOfApprox(
    const math_Vector&     Parameters,
    const Standard_Integer degreemin    = 4,
    const Standard_Integer degreemax    = 8,
    const Standard_Real    Tolerance3d  = 1.0e-03,
    const Standard_Real    Tolerance2d  = 1.0e-06,
    const Standard_Integer NbIterations = 5,
    const Standard_Boolean cutting      = Standard_True,
    const Standard_Boolean Squares      = Standard_False);

  //! Initializes the fields of the algorithm.
  Standard_EXPORT BRepApprox_TheComputeLineOfApprox(
    const Standard_Integer           degreemin       = 4,
    const Standard_Integer           degreemax       = 8,
    const Standard_Real              Tolerance3d     = 1.0e-03,
    const Standard_Real              Tolerance2d     = 1.0e-06,
    const Standard_Integer           NbIterations    = 5,
    const Standard_Boolean           cutting         = Standard_True,
    const Approx_ParametrizationType parametrization = Approx_ChordLength,
    const Standard_Boolean           Squares         = Standard_False);

  //! Constructs an interpolation of the MultiLine <Line>
  //! The result will be a C2 curve of degree 3.
  Standard_EXPORT void Interpol(const BRepApprox_TheMultiLineOfApprox& Line);

  //! Initializes the fields of the algorithm.
  Standard_EXPORT void Init(const Standard_Integer           degreemin       = 4,
                            const Standard_Integer           degreemax       = 8,
                            const Standard_Real              Tolerance3d     = 1.0e-03,
                            const Standard_Real              Tolerance2d     = 1.0e-06,
                            const Standard_Integer           NbIterations    = 5,
                            const Standard_Boolean           cutting         = Standard_True,
                            const Approx_ParametrizationType parametrization = Approx_ChordLength,
                            const Standard_Boolean           Squares         = Standard_False);

  //! runs the algorithm after having initialized the fields.
  Standard_EXPORT void Perform(const BRepApprox_TheMultiLineOfApprox& Line);

  //! The approximation will begin with the
  //! set of  parameters <ThePar>.
  Standard_EXPORT void SetParameters(const math_Vector& ThePar);

  //! The approximation will be done with the
  //! set of knots <Knots>. The multiplicities will be set
  //! with the degree and the desired continuity.
  Standard_EXPORT void SetKnots(const TColStd_Array1OfReal& Knots);

  //! The approximation will be done with the
  //! set of knots <Knots> and the multiplicities <Mults>.
  Standard_EXPORT void SetKnotsAndMultiplicities(const TColStd_Array1OfReal&    Knots,
                                                 const TColStd_Array1OfInteger& Mults);

  //! changes the degrees of the approximation.
  Standard_EXPORT void SetDegrees(const Standard_Integer degreemin,
                                  const Standard_Integer degreemax);

  //! Changes the tolerances of the approximation.
  Standard_EXPORT void SetTolerances(const Standard_Real Tolerance3d,
                                     const Standard_Real Tolerance2d);

  //! sets the continuity of the spline.
  //! if C = 2, the spline will be C2.
  Standard_EXPORT void SetContinuity(const Standard_Integer C);

  //! changes the first and the last constraint points.
  Standard_EXPORT void SetConstraints(const AppParCurves_Constraint firstC,
                                      const AppParCurves_Constraint lastC);

  //! Sets periodic flag.
  //! If thePeriodic = Standard_True, algorithm tries to build periodic
  //! multicurve using corresponding C1 boundary condition for first and last multipoints.
  //! Multiline must be closed.
  Standard_EXPORT void SetPeriodic(const Standard_Boolean thePeriodic);

  //! returns False if at a moment of the approximation,
  //! the status NoApproximation has been sent by the user
  //! when more points were needed.
  Standard_EXPORT Standard_Boolean IsAllApproximated() const;

  //! returns False if the status NoPointsAdded has been sent.
  Standard_EXPORT Standard_Boolean IsToleranceReached() const;

  //! returns the tolerances 2d and 3d of the MultiBSpCurve.
  Standard_EXPORT void Error(Standard_Real& tol3d, Standard_Real& tol2d) const;

  //! returns the result of the approximation.
  Standard_EXPORT const AppParCurves_MultiBSpCurve& Value() const;

  //! returns the result of the approximation.
  Standard_EXPORT AppParCurves_MultiBSpCurve& ChangeValue();

  //! returns the new parameters of the approximation
  //! corresponding to the points of the MultiBSpCurve.
  Standard_EXPORT const TColStd_Array1OfReal& Parameters() const;

protected:
private:
  //! is internally used in the algorithm.
  Standard_EXPORT Standard_Boolean Compute(const BRepApprox_TheMultiLineOfApprox& Line,
                                           const Standard_Integer                 fpt,
                                           const Standard_Integer                 lpt,
                                           math_Vector&                           Para,
                                           const TColStd_Array1OfReal&            Knots,
                                           TColStd_Array1OfInteger&               Mults);

  //! is internally used in the algorithm.
  Standard_EXPORT Standard_Boolean ComputeCurve(const BRepApprox_TheMultiLineOfApprox& Line,
                                                const Standard_Integer                 firspt,
                                                const Standard_Integer                 lastpt);

  //! computes new parameters between firstP and lastP.
  Standard_EXPORT void Parameters(const BRepApprox_TheMultiLineOfApprox& Line,
                                  const Standard_Integer                 firstP,
                                  const Standard_Integer                 LastP,
                                  math_Vector&                           TheParameters) const;

  Standard_EXPORT Standard_Real SearchFirstLambda(const BRepApprox_TheMultiLineOfApprox& Line,
                                                  const math_Vector&                     Para,
                                                  const TColStd_Array1OfReal&            Knots,
                                                  const math_Vector&                     V,
                                                  const Standard_Integer index) const;

  Standard_EXPORT Standard_Real SearchLastLambda(const BRepApprox_TheMultiLineOfApprox& Line,
                                                 const math_Vector&                     Para,
                                                 const TColStd_Array1OfReal&            Knots,
                                                 const math_Vector&                     V,
                                                 const Standard_Integer index) const;

  Standard_EXPORT void TangencyVector(const BRepApprox_TheMultiLineOfApprox& Line,
                                      const AppParCurves_MultiCurve&         C,
                                      const Standard_Real                    U,
                                      math_Vector&                           V) const;

  Standard_EXPORT void FirstTangencyVector(const BRepApprox_TheMultiLineOfApprox& Line,
                                           const Standard_Integer                 index,
                                           math_Vector&                           V) const;

  Standard_EXPORT void LastTangencyVector(const BRepApprox_TheMultiLineOfApprox& Line,
                                          const Standard_Integer                 index,
                                          math_Vector&                           V) const;

  Standard_EXPORT void FindRealConstraints(const BRepApprox_TheMultiLineOfApprox& Line);

  AppParCurves_MultiBSpCurve                     TheMultiBSpCurve;
  Standard_Boolean                               alldone;
  Standard_Boolean                               tolreached;
  Approx_ParametrizationType                     Par;
  Handle(TColStd_HArray1OfReal)                  myParameters;
  Handle(TColStd_HArray1OfReal)                  myfirstParam;
  Handle(TColStd_HArray1OfReal)                  myknots;
  Handle(TColStd_HArray1OfInteger)               mymults;
  Standard_Boolean                               myhasknots;
  Standard_Boolean                               myhasmults;
  Handle(AppParCurves_HArray1OfConstraintCouple) myConstraints;
  Standard_Integer                               mydegremin;
  Standard_Integer                               mydegremax;
  Standard_Real                                  mytol3d;
  Standard_Real                                  mytol2d;
  Standard_Real                                  currenttol3d;
  Standard_Real                                  currenttol2d;
  Standard_Boolean                               mycut;
  Standard_Boolean                               mysquares;
  Standard_Integer                               myitermax;
  AppParCurves_Constraint                        myfirstC;
  AppParCurves_Constraint                        mylastC;
  AppParCurves_Constraint                        realfirstC;
  AppParCurves_Constraint                        reallastC;
  Standard_Integer                               mycont;
  Standard_Real                                  mylambda1;
  Standard_Real                                  mylambda2;
  Standard_Boolean                               myPeriodic;
};

#endif // _BRepApprox_TheComputeLineOfApprox_HeaderFile
