// Created on: 1993-12-03
// Created by: Jacques GOUSSARD
// Copyright (c) 1993-1999 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_HeaderFile
#define _BlendFunc_HeaderFile

#include "Adaptor3d_Surface.hxx"
#include "BlendFunc_SectionShape.hxx"
#include "Convert_ParameterisationType.hxx"
#include "NCollection_Array1.hxx"
#include "Standard_Integer.hxx"
#include "GeomAbs_Shape.hxx"

class gp_Pnt2d;
class gp_Vec;

//! This package provides a set of generic functions, that can
//! instantiated to compute blendings between two surfaces
//! (Constant radius, Evolutive radius, Ruled surface).
class BlendFunc
{
public:
  DEFINE_STANDARD_ALLOC

  Standard_EXPORT static void GetShape(const BlendFunc_SectionShape  SectShape,
                                       const double                  MaxAng,
                                       int&                          NbPoles,
                                       int&                          NbKnots,
                                       int&                          Degree,
                                       Convert_ParameterisationType& TypeConv);

  Standard_EXPORT static void Knots(const BlendFunc_SectionShape SectShape,
                                    NCollection_Array1<double>&  TKnots);

  Standard_EXPORT static void Mults(const BlendFunc_SectionShape SectShape,
                                    NCollection_Array1<int>&     TMults);

  Standard_EXPORT static void GetMinimalWeights(const BlendFunc_SectionShape       SectShape,
                                                const Convert_ParameterisationType TConv,
                                                const double                       AngleMin,
                                                const double                       AngleMax,
                                                NCollection_Array1<double>&        Weigths);

  //! Used to obtain the next level of continuity.
  Standard_EXPORT static GeomAbs_Shape NextShape(const GeomAbs_Shape S);

  Standard_EXPORT static bool ComputeNormal(const occ::handle<Adaptor3d_Surface>& Surf,
                                            const gp_Pnt2d&                       p2d,
                                            gp_Vec&                               Normal);

  Standard_EXPORT static bool ComputeDNormal(const occ::handle<Adaptor3d_Surface>& Surf,
                                             const gp_Pnt2d&                       p2d,
                                             gp_Vec&                               Normal,
                                             gp_Vec&                               DNu,
                                             gp_Vec&                               DNv);
};

#endif // _BlendFunc_HeaderFile