global_functions_2.h

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// Copyright (c) 2003-2004  Utrecht University (The Netherlands),
// ETH Zurich (Switzerland), Freie Universitaet Berlin (Germany),
// INRIA Sophia-Antipolis (France), Martin-Luther-University Halle-Wittenberg
// (Germany), Max-Planck-Institute Saarbruecken (Germany), RISC Linz (Austria),
// and Tel-Aviv University (Israel).  All rights reserved.
//
// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; version 2.1 of the License.
// See the file LICENSE.LGPL distributed with CGAL.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $Source: /CVSROOT/CGAL/Packages/Kernel_23/include/CGAL/Kernel/global_functions_2.h,v $
// $Revision: 1.20 $ $Date: 2004/09/14 13:59:10 $
// $Name:  $
//
// Author(s)     : Sylvain Pion
 
#ifndef CGAL_KERNEL_GLOBAL_FUNCTIONS_2_H
#define CGAL_KERNEL_GLOBAL_FUNCTIONS_2_H

// Generic functions taking "user classes" as parameters, calling the
// internal functions (in *_internal*.h, namespace CGALi) taking a kernel as
// additional parameter, which themselves call the corresponding kernel
// functors.

#include <CGAL/user_classes.h>
#include <CGAL/Kernel/global_functions_internal_2.h>
#include <CGAL/Kernel/mpl.h>

CGAL_BEGIN_NAMESPACE

template < class K >
inline
Angle
angle(const Point_2<K> &p,
      const Point_2<K> &q,
      const Point_2<K> &r)
{
  return CGALi::angle(p, q, r, K());
}

template < class K >
inline
bool
are_ordered_along_line(const Point_2<K> &p,
                       const Point_2<K> &q,
                       const Point_2<K> &r)
{
  return CGALi::are_ordered_along_line(p, q, r, K());
}

template < class K >
inline
bool
are_strictly_ordered_along_line(const Point_2<K> &p,
                                const Point_2<K> &q,
                                const Point_2<K> &r)
{
  return CGALi::are_strictly_ordered_along_line(p, q, r, K());
}

template < class K >
inline
typename K::FT
area(const Point_2<K> &p, const Point_2<K> &q, const Point_2<K> &r)
{
  return CGALi::area(p, q, r, K());
}

template <typename K>
inline
typename K::Line_2
bisector(const Point_2<K> &p, const Point_2<K> &q)
{
  return CGALi::bisector(p, q, K());
}

template <typename K>
inline
typename K::Line_2
bisector(const Line_2<K> &l1, const Line_2<K> &l2)
{
  return CGALi::bisector(l1, l2, K());
}

template < class K >
inline
typename K::Point_2
centroid(const Point_2<K> &p,
         const Point_2<K> &q,
         const Point_2<K> &r)
{
  return CGALi::centroid(p, q, r, K());
}

template < class K >
inline
typename K::Point_2
centroid(const Point_2<K> &p,
         const Point_2<K> &q,
         const Point_2<K> &r,
         const Point_2<K> &s)
{
  return CGALi::centroid(p, q, r, s, K());
}

template < class K >
inline
typename K::Point_2
circumcenter(const Point_2<K> &p,
             const Point_2<K> &q,
             const Point_2<K> &r)
{
  return CGALi::circumcenter(p, q, r, K());
}

template < class K >
inline
typename K::Point_2
circumcenter(const Triangle_2<K> &t)
{
  return CGALi::circumcenter(t, K());
}

template < class K >
inline
bool
collinear(const Point_2<K> &p, const Point_2<K> &q, const Point_2<K> &r)
{
  return CGALi::collinear(p, q, r, K());
}

template < class K >
inline
bool
collinear_are_ordered_along_line(const Point_2<K> &p,
                                 const Point_2<K> &q,
                                 const Point_2<K> &r)
{
  return CGALi::collinear_are_ordered_along_line(p, q, r, K());
}

template < class K >
inline
bool
collinear_are_strictly_ordered_along_line(const Point_2<K> &p,
                                          const Point_2<K> &q,
                                          const Point_2<K> &r)
{
  return CGALi::collinear_are_strictly_ordered_along_line(p, q, r, K());
}

template < typename K >
inline
Comparison_result
compare_angle_with_x_axis(const Direction_2<K>& d1,
                          const Direction_2<K>& d2)
{
  return CGALi::compare_angle_with_x_axis(d1, d2, K());
}

template <class K >
inline
Comparison_result
compare_distance_to_point(const Point_2<K>& p,
                          const Point_2<K>& q,
                          const Point_2<K>& r)
{
  return CGALi::compare_distance_to_point(p, q, r, K());
}

template <class K>
inline
Comparison_result
compare_signed_distance_to_line(const Point_2<K>& p,
				const Point_2<K>& q,
				const Point_2<K>& r,
				const Point_2<K>& s)
{
  return CGALi::compare_signed_distance_to_line(p, q, r, s, K());
}

template <class K>
inline
Comparison_result
compare_signed_distance_to_line(const Line_2<K>& l,
				const Point_2<K>& p,
				const Point_2<K>& q)
{
  return CGALi::compare_signed_distance_to_line(l, p, q, K());
}

/* FIXME : Undocumented, obsolete...
template < class K >
inline
Comparison_result
compare_lexicographically_xy(const Point_2<K> &p,
                             const Point_2<K> &q)
{
  return K().compare_xy_2_object()(p, q);
}
*/

template < class K >
inline
Comparison_result
compare_slopes(const Line_2<K> &l1, const Line_2<K> &l2)
{
  return CGALi::compare_slopes(l1, l2, K());
}

template < class K >
inline
Comparison_result
compare_slopes(const Segment_2<K> &s1, const Segment_2<K> &s2)
{
  return CGALi::compare_slopes(s1, s2, K());
}

template < class K >
inline
Comparison_result
compare_x(const Point_2<K> &p, const Point_2<K> &q)
{
  return CGALi::compare_x(p, q, K());
}

template < class K >
inline
Comparison_result
compare_x(const Point_2<K>& p,
          const Line_2<K>& l1,
          const Line_2<K>& l2)
{
  return CGALi::compare_x(p, l1, l2, K());
}

template < class K >
inline
Comparison_result
compare_x(const Line_2<K> &l,
          const Line_2<K> &h1,
          const Line_2<K> &h2)
{
  return CGALi::compare_x(l, h1, h2, K());
}

template < class K >
inline
Comparison_result
compare_x(const Line_2<K> &l1,
          const Line_2<K> &h1,
          const Line_2<K> &l2,
          const Line_2<K> &h2)
{
  return CGALi::compare_x(l1, h1, l2, h2, K());
}

template < class K >
inline
Comparison_result
compare_x_at_y(const Point_2<K>& p, const Line_2<K>& h)
{
  return CGALi::compare_x_at_y(p, h, K());
}

/* Undocumented
template < class K >
inline
Comparison_result
compare_x_at_y(const Point_2<K>& p, const Segment_2<K>& s)
{
  return CGALi::compare_x_at_y(p, s, K());
}
*/

template < class K >
inline
Comparison_result
compare_x_at_y(const Point_2<K> &p,
               const Line_2<K> &h1,
               const Line_2<K> &h2)
{
  return CGALi::compare_x_at_y(p, h1, h2, K());
}

template < class K >
inline
Comparison_result
compare_x_at_y(const Line_2<K> &l1,
               const Line_2<K> &l2,
               const Line_2<K> &h)
{
  return CGALi::compare_x_at_y(l1, l2, h, K());
}

template < class K >
inline
Comparison_result
compare_x_at_y(const Line_2<K> &l1,
               const Line_2<K> &l2,
               const Line_2<K> &h1,
               const Line_2<K> &h2)
{
  return CGALi::compare_x_at_y(l1, l2, h1, h2, K());
}

template < class K >
inline
Comparison_result
compare_xy(const Point_2<K> &p, const Point_2<K> &q)
{
  return CGALi::compare_xy(p, q, K());
}

template < class K >
inline
Comparison_result
compare_y(const Point_2<K> &p, const Point_2<K> &q)
{
  return CGALi::compare_y(p, q, K());
}

template < class K >
inline
Comparison_result
compare_y(const Point_2<K> &p,
          const Line_2<K> &l1,
          const Line_2<K> &l2)
{
  return CGALi::compare_y(p, l1, l2, K());
}

template < class K >
inline
Comparison_result
compare_y(const Line_2<K> &l1,
          const Line_2<K> &l2,
          const Line_2<K> &h1,
          const Line_2<K> &h2)
{
  return CGALi::compare_y(l1, l2, h1, h2, K());
}

template < class K >
inline
Comparison_result
compare_y(const Line_2<K> &l,
          const Line_2<K> &h1,
          const Line_2<K> &h2)
{
  return CGALi::compare_y(l, h1, h2, K());
}

template < class K >
inline
Comparison_result
compare_y_at_x(const Point_2<K> &p, const Segment_2<K> &s)
{
  return CGALi::compare_y_at_x(p, s, K());
}

template < class K >
inline
Comparison_result
compare_y_at_x(const Point_2<K> &p,
               const Segment_2<K> &s1,
               const Segment_2<K> &s2)
{
  return CGALi::compare_y_at_x(p, s1, s2, K());
}

template < class K >
inline
Comparison_result
compare_y_at_x(const Point_2<K> &p, const Line_2<K> &h)
{
  return CGALi::compare_y_at_x(p, h, K());
}  

template < class K >
inline
Comparison_result
compare_y_at_x(const Point_2<K> &p,
               const Line_2<K> &h1,
               const Line_2<K> &h2)
{
  return CGALi::compare_y_at_x(p, h1, h2, K());
}

template < class K >
inline
Comparison_result
compare_y_at_x(const Line_2<K> &l1,
               const Line_2<K> &l2,
               const Line_2<K> &h)
{
  return CGALi::compare_y_at_x(l1, l2, h, K());
}

template < class K >
inline
Comparison_result
compare_y_at_x(const Line_2<K> &l1,
               const Line_2<K> &l2,
               const Line_2<K> &h1,
               const Line_2<K> &h2)
{
  return CGALi::compare_y_at_x(l1, l2, h1, h2, K());
}

template <class K>
inline
bool
has_larger_distance_to_point(const Point_2<K>& p,
			     const Point_2<K>& q,