// Created on: 1992-05-06
// Created by: Jacques GOUSSARD
// Copyright (c) 1992-1999 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 _IntPatch_TheSurfFunction_HeaderFile
#define _IntPatch_TheSurfFunction_HeaderFile

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

#include <Standard_Address.hxx>
#include <Standard_Real.hxx>
#include <gp_Pnt.hxx>
#include <Standard_Boolean.hxx>
#include <gp_Vec.hxx>
#include <gp_Dir2d.hxx>
#include <math_FunctionSetWithDerivatives.hxx>
#include <Standard_Integer.hxx>
#include <math_Vector.hxx>
class StdFail_UndefinedDerivative;
class Adaptor3d_HSurface;
class Adaptor3d_HSurfaceTool;
class IntSurf_Quadric;
class IntSurf_QuadricTool;
class math_Matrix;
class gp_Pnt;
class gp_Vec;
class gp_Dir2d;



class IntPatch_TheSurfFunction  : public math_FunctionSetWithDerivatives
{
public:

  DEFINE_STANDARD_ALLOC

  
  Standard_EXPORT IntPatch_TheSurfFunction();
  
  Standard_EXPORT IntPatch_TheSurfFunction(const Handle(Adaptor3d_HSurface)& PS, const IntSurf_Quadric& IS);
  
  Standard_EXPORT IntPatch_TheSurfFunction(const IntSurf_Quadric& IS);
  
    void Set (const Handle(Adaptor3d_HSurface)& 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 Handle(Adaptor3d_HSurface)& 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 Handle(Adaptor3d_HSurface)
#define ThePSurface_hxx <Adaptor3d_HSurface.hxx>
#define ThePSurfaceTool Adaptor3d_HSurfaceTool
#define ThePSurfaceTool_hxx <Adaptor3d_HSurfaceTool.hxx>
#define TheISurface IntSurf_Quadric
#define TheISurface_hxx <IntSurf_Quadric.hxx>
#define TheISurfaceTool IntSurf_QuadricTool
#define TheISurfaceTool_hxx <IntSurf_QuadricTool.hxx>
#define IntImp_ZerImpFunc IntPatch_TheSurfFunction
#define IntImp_ZerImpFunc_hxx <IntPatch_TheSurfFunction.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 // _IntPatch_TheSurfFunction_HeaderFile