// ======================================================================
//
// 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/Segment_2.h
// revision      : $Revision$
// revision_date : $Date$
// author(s)     : Andreas Fabri, Herve Bronnimann
// coordinator   : INRIA Sophia-Antipolis (Mariette.Yvinec@sophia.inria.fr)
//
// ======================================================================

#ifndef CGAL_CARTESIAN_SEGMENT_2_H
#define CGAL_CARTESIAN_SEGMENT_2_H

#include <CGAL/Cartesian/redefine_names_2.h>
#include <CGAL/Twotuple.h>

CGAL_BEGIN_NAMESPACE

template < class R_ >
class SegmentC2 CGAL_ADVANCED_KERNEL_PARTIAL_SPEC
  : public Handle_for< Twotuple< typename R_::Point_2> >
{
public:
  typedef R_                                    R;
  typedef typename R::FT                        FT;
  typedef typename R::RT                        RT;
#ifndef CGAL_CFG_NO_ADVANCED_KERNEL
  typedef SegmentC2<R,Cartesian_tag>            Self;
  typedef typename R::Point_2                   Point_2;
  typedef typename R::Vector_2                  Vector_2;
  typedef typename R::Direction_2               Direction_2;
  typedef typename R::Line_2                    Line_2;
  typedef typename R::Ray_2                     Ray_2;
  typedef typename R::Triangle_2                Triangle_2;
  typedef typename R::Iso_rectangle_2           Iso_rectangle_2;
  typedef typename R::Aff_transformation_2      Aff_transformation_2;
  typedef typename R::Circle_2                  Circle_2;
#else
  typedef SegmentC2<R>                          Self;
  typedef typename R::Point_2_base              Point_2;
  typedef typename R::Vector_2_base             Vector_2;
  typedef typename R::Direction_2_base          Direction_2;
  typedef typename R::Line_2_base               Line_2;
  typedef typename R::Ray_2_base                Ray_2;
  typedef typename R::Triangle_2_base           Triangle_2;
  typedef typename R::Iso_rectangle_2_base      Iso_rectangle_2;
  typedef typename R::Aff_transformation_2_base Aff_transformation_2;
  typedef typename R::Circle_2_base             Circle_2;
#endif

  SegmentC2();
  SegmentC2(const Self  &s);
  SegmentC2(const Point_2 &sp, const Point_2 &ep);
  ~SegmentC2();

  bool        is_horizontal() const;
  bool        is_vertical() const;
  bool        has_on(const Point_2 &p) const;
  bool        collinear_has_on(const Point_2 &p) const;

  bool        operator==(const Self &s) const;
  bool        operator!=(const Self &s) const;
  
  Point_2     start() const;
  Point_2     end() const;

  Point_2     source() const;
  Point_2     target() const;

  Point_2     min() const;
  Point_2     max() const;
  Point_2     vertex(int i) const;
  Point_2     point(int i) const;
  Point_2     operator[](int i) const;

  FT          squared_length() const;

  Direction_2 direction() const;
  Line_2      supporting_line() const;
  Self        opposite() const;
  Self        transform(const Aff_transformation_2 &t) const;

  bool        is_degenerate() const;
  Bbox_2      bbox() const;

};

CGAL_END_NAMESPACE

#ifndef CGAL_CARTESIAN_CLASS_DEFINED
#include <CGAL/Cartesian/Segment_2.C>
#endif 

#endif // CGAL_CARTESIAN_SEGMENT_2_H