// ======================================================================
//
// Copyright (c) 2000 The CGAL Consortium
//
// This software and related documentation is part of an INTERNAL release
// of the Computational Geometry Algorithms Library (CGAL). It is not
// intended for general use.
//
// ----------------------------------------------------------------------
//
// release       :
// release_date  :
//
// file          : include/CGAL/Cartesian/Triangle_3.h
// revision      : $Revision$
// revision_date : $Date$
// author(s)     : Andreas Fabri
// coordinator   : INRIA Sophia-Antipolis (Mariette.Yvinec@sophia.inria.fr)
//
// ======================================================================

#ifndef CGAL_CARTESIAN_TRIANGLE_3_H
#define CGAL_CARTESIAN_TRIANGLE_3_H

#include <CGAL/Cartesian/redefine_names_3.h>
#include <CGAL/Threetuple.h>

CGAL_BEGIN_NAMESPACE

template <class R_>
class TriangleC3 CGAL_ADVANCED_KERNEL_PARTIAL_SPEC
  : public Handle_for< Threetuple< typename R_::Point_3 > >
{
public:
  typedef R_                               R;
  typedef typename R::FT                   FT;
  typedef typename R::RT                   RT;
#ifndef CGAL_CFG_NO_ADVANCED_KERNEL
  typedef TriangleC3<R CGAL_CTAG>          Self;
  typedef typename R::Point_3              Point_3;
  typedef typename R::Vector_3             Vector_3;
  typedef typename R::Plane_3              Plane_3;
  typedef typename R::Aff_transformation_3 Aff_transformation_3;
#else
  typedef TriangleC3<R>                         Self;
  typedef typename R::Point_3_base              Point_3;
  typedef typename R::Vector_3_base             Vector_3;
  typedef typename R::Plane_3_base              Plane_3;
  typedef typename R::Aff_transformation_3_base Aff_transformation_3;
#endif

  TriangleC3();
  TriangleC3(const Self &t);
  TriangleC3(const Point_3 &p, const Point_3 &q, const Point_3 &r);
  ~TriangleC3();

  bool       operator==(const Self &t) const;
  bool       operator!=(const Self &t) const;

  Plane_3    supporting_plane() const;

  Self       transform(const Aff_transformation_3 &t) const;

  bool       has_on(const Point_3 &p) const;
  bool       is_degenerate() const;

  Point_3    vertex(int i) const;
  Point_3    operator[](int i) const;

  Bbox_3     bbox() const;

};

CGAL_END_NAMESPACE

#ifndef CGAL_CARTESIAN_CLASS_DEFINED
#include <CGAL/Cartesian/Triangle_3.C>
#endif 

#endif // CGAL_CARTESIAN_TRIANGLE_3_H