// 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_TheZerImpFuncOfTheImpPrmSvSurfacesOfApprox_HeaderFile
#define _BRepApprox_TheZerImpFuncOfTheImpPrmSvSurfacesOfApprox_HeaderFile

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

#include <gp_Pnt.hxx>
#include <gp_Vec.hxx>
#include <gp_Dir2d.hxx>
#include <math_FunctionSetWithDerivatives.hxx>
#include <math_Vector.hxx>
class StdFail_UndefinedDerivative;
class BRepAdaptor_Surface;
class BRepApprox_SurfaceTool;
class IntSurf_Quadric;
class IntSurf_QuadricTool;
class math_Matrix;
class gp_Pnt;
class gp_Vec;
class gp_Dir2d;

class BRepApprox_TheZerImpFuncOfTheImpPrmSvSurfacesOfApprox : public math_FunctionSetWithDerivatives
{
public:
  DEFINE_STANDARD_ALLOC

  Standard_EXPORT BRepApprox_TheZerImpFuncOfTheImpPrmSvSurfacesOfApprox();

  Standard_EXPORT BRepApprox_TheZerImpFuncOfTheImpPrmSvSurfacesOfApprox(
    const BRepAdaptor_Surface& PS,
    const IntSurf_Quadric&     IS);

  Standard_EXPORT BRepApprox_TheZerImpFuncOfTheImpPrmSvSurfacesOfApprox(const IntSurf_Quadric& IS);

  void Set(const BRepAdaptor_Surface& PS);

  void SetImplicitSurface(const IntSurf_Quadric& IS);

  void Set(const Standard_Real Tolerance);

  Standard_EXPORT Standard_Integer NbVariables() const;

  Standard_EXPORT Standard_Integer NbEquations() const;

  Standard_EXPORT Standard_Boolean Value(const math_Vector& X, math_Vector& F);

  Standard_EXPORT Standard_Boolean Derivatives(const math_Vector& X, math_Matrix& D);

  Standard_EXPORT Standard_Boolean Values(const math_Vector& X, math_Vector& F, math_Matrix& D);

  Standard_Real Root() const;

  //! Returns the value Tol so that if Abs(Func.Root())<Tol
  //! the function is considered null.
  Standard_Real Tolerance() const;

  const gp_Pnt& Point() const;

  Standard_EXPORT Standard_Boolean IsTangent();

  const gp_Vec& Direction3d();

  const gp_Dir2d& Direction2d();

  const BRepAdaptor_Surface& PSurface() const;

  const IntSurf_Quadric& ISurface() const;

protected:
private:
  Standard_Address surf;
  Standard_Address func;
  Standard_Real    u;
  Standard_Real    v;
  Standard_Real    tol;
  gp_Pnt           pntsol;
  Standard_Real    valf;
  Standard_Boolean computed;
  Standard_Boolean tangent;
  Standard_Real    tgdu;
  Standard_Real    tgdv;
  gp_Vec           gradient;
  Standard_Boolean derived;
  gp_Vec           d1u;
  gp_Vec           d1v;
  gp_Vec           d3d;
  gp_Dir2d         d2d;
};

#define ThePSurface BRepAdaptor_Surface
#define ThePSurface_hxx <BRepAdaptor_Surface.hxx>
#define ThePSurfaceTool BRepApprox_SurfaceTool
#define ThePSurfaceTool_hxx <BRepApprox_SurfaceTool.hxx>
#define TheISurface IntSurf_Quadric
#define TheISurface_hxx <IntSurf_Quadric.hxx>
#define TheISurfaceTool IntSurf_QuadricTool
#define TheISurfaceTool_hxx <IntSurf_QuadricTool.hxx>
#define IntImp_ZerImpFunc BRepApprox_TheZerImpFuncOfTheImpPrmSvSurfacesOfApprox
#define IntImp_ZerImpFunc_hxx <BRepApprox_TheZerImpFuncOfTheImpPrmSvSurfacesOfApprox.hxx>

#include <IntImp_ZerImpFunc.lxx>

#undef ThePSurface
#undef ThePSurface_hxx
#undef ThePSurfaceTool
#undef ThePSurfaceTool_hxx
#undef TheISurface
#undef TheISurface_hxx
#undef TheISurfaceTool
#undef TheISurfaceTool_hxx
#undef IntImp_ZerImpFunc
#undef IntImp_ZerImpFunc_hxx

#endif // _BRepApprox_TheZerImpFuncOfTheImpPrmSvSurfacesOfApprox_HeaderFile
