// Created on: 1996-06-06
// Created by: Stagiaire Xuan Trang PHAMPHU
// Copyright (c) 1996-1999 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 _BlendFunc_Chamfer_HeaderFile
#define _BlendFunc_Chamfer_HeaderFile

#include "Adaptor3d_Surface.hxx"
#include "BlendFunc_Corde.hxx"
#include "BlendFunc_GenChamfer.hxx"
#include "math_Vector.hxx"
#include "NCollection_Array1.hxx"

class math_Matrix;
class gp_Pnt;
class gp_Vec;
class gp_Vec2d;

//! Class for a function used to compute a "ordinary" chamfer:
//! when distances from spine to surfaces are constant
class BlendFunc_Chamfer : public BlendFunc_GenChamfer
{
public:
  DEFINE_STANDARD_ALLOC

  Standard_EXPORT BlendFunc_Chamfer(const occ::handle<Adaptor3d_Surface>& S1,
                                    const occ::handle<Adaptor3d_Surface>& S2,
                                    const occ::handle<Adaptor3d_Curve>&   CG);

  //! computes the values <F> of the Functions for the
  //! variable <X>.
  //! Returns True if the computation was done successfully,
  //! False otherwise.
  Standard_EXPORT bool Value(const math_Vector& X, math_Vector& F) override;

  //! returns the values <D> of the derivatives for the
  //! variable <X>.
  //! Returns True if the computation was done successfully,
  //! False otherwise.
  Standard_EXPORT bool Derivatives(const math_Vector& X, math_Matrix& D) override;

  Standard_EXPORT void Set(const double Param) override;

  Standard_EXPORT bool IsSolution(const math_Vector& Sol, const double Tol) override;

  Standard_EXPORT const gp_Pnt& PointOnS1() const override;

  Standard_EXPORT const gp_Pnt& PointOnS2() const override;

  Standard_EXPORT bool IsTangencyPoint() const override;

  Standard_EXPORT const gp_Vec& TangentOnS1() const override;

  Standard_EXPORT const gp_Vec2d& Tangent2dOnS1() const override;

  Standard_EXPORT const gp_Vec& TangentOnS2() const override;

  Standard_EXPORT const gp_Vec2d& Tangent2dOnS2() const override;

  //! Returns the tangent vector at the section,
  //! at the beginning and the end of the section, and
  //! returns the normal (of the surfaces) at
  //! these points.
  Standard_EXPORT void Tangent(const double U1,
                               const double V1,
                               const double U2,
                               const double V2,
                               gp_Vec&      TgFirst,
                               gp_Vec&      TgLast,
                               gp_Vec&      NormFirst,
                               gp_Vec&      NormLast) const override;

  //! Sets the distances and the "quadrant".
  Standard_EXPORT void Set(const double Dist1, const double Dist2, const int Choix) override;

  //! Returns the length of the maximum section
  Standard_EXPORT double GetSectionSize() const override;

private:
  BlendFunc_Corde corde1;
  BlendFunc_Corde corde2;
};

#endif // _BlendFunc_Chamfer_HeaderFile