// Copyright (c) 2003-2006  INRIA Sophia-Antipolis (France).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org); you may redistribute it under
// the terms of the Q Public License version 1.0.
// See the file LICENSE.QPL 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.
//
// $URL: svn+ssh://scm.gforge.inria.fr/svn/cgal/branches/CGAL-3.2-branch/Curved_kernel/include/CGAL/Line_arc_2.h $
// $Id: Line_arc_2.h 29284 2006-03-09 13:36:00Z teillaud $
//
// Author(s)     : Monique Teillaud, Sylvain Pion, Julien Hazebrouck

// Partially supported by the IST Programme of the EU as a Shared-cost
// RTD (FET Open) Project under Contract No  IST-2000-26473 
// (ECG - Effective Computational Geometry for Curves and Surfaces) 
// and a STREP (FET Open) Project under Contract No  IST-006413 
// (ACS -- Algorithms for Complex Shapes)

#ifndef CGAL_LINE_ARC_2_H
#define CGAL_LINE_ARC_2_H

namespace CGAL {

template <class CircularKernel> 
class Line_arc_2 
  : public CircularKernel::Kernel_base::Line_arc_2
{
  typedef typename CircularKernel::FT                        FT;
  typedef typename CircularKernel::RT                        RT;
  //typedef typename CircularKernel::Linear_kernel::Point_2    Point_2;
  typedef typename CircularKernel::Point_2                   Point_2;
  typedef typename CircularKernel::Line_2                    Line_2;
  typedef typename CircularKernel::Circle_2                  Circle_2;
  typedef typename CircularKernel::Circular_arc_point_2   Circular_arc_point_2;
  typedef typename CircularKernel::Segment_2                 Segment_2;

  typedef typename CircularKernel::Kernel_base::Line_arc_2 RLine_arc_2;
public:
  typedef  RLine_arc_2 Rep;
  typedef  CircularKernel   R; 

 const Rep& rep() const
  {
    return *this;
  }

  Rep& rep()
  {
    return *this;
  }

   Line_arc_2()
     : RLine_arc_2(typename R::Construct_line_arc_2()())
   {}

   Line_arc_2(const Line_2 &support,
	      const Circle_2 &c1,const bool b1,
	      const Circle_2 &c2,const bool b2)
     : RLine_arc_2(typename R::Construct_line_arc_2()(support, c1, b1, c2, b2))
   {}

   Line_arc_2(const Line_2 &support,
	       const Line_2 &l1,
	       const Line_2 &l2)
     : RLine_arc_2(typename R::Construct_line_arc_2()(support, l1, l2))
   {}

   Line_arc_2(const Line_2 &support,
	       const Circular_arc_point_2 &p1,
	       const Circular_arc_point_2 &p2)
     : RLine_arc_2(typename R::Construct_line_arc_2()(support, p1, p2))
   {}

   Line_arc_2(const Segment_2 &s)
     : RLine_arc_2(typename R::Construct_line_arc_2()(s))
   {}
   
    Line_arc_2(const Point_2 &p1,
	       const Point_2 &p2)
      : RLine_arc_2(typename R::Construct_line_arc_2()(p1, p2))
   {}

    Line_arc_2(const RLine_arc_2 &a )
     : RLine_arc_2(a)
   {}

  typename Qualified_result_of
  <typename R::Construct_circular_source_vertex_2,Line_arc_2>::type
    //const Circular_arc_point_2 & 
    source() const
  {
        return typename R::Construct_circular_source_vertex_2()(*this);
  }

  typename Qualified_result_of
  <typename R::Construct_circular_target_vertex_2,Line_arc_2>::type
  //const Circular_arc_point_2 & 
    target() const
  {
        return typename R::Construct_circular_target_vertex_2()(*this);
  }

  typename Qualified_result_of
  <typename R::Construct_circular_min_vertex_2,Line_arc_2>::type
  //const Circular_arc_point_2 & left() const
  left() const
  {
        return typename R::Construct_circular_min_vertex_2()(*this);
  }

  typename Qualified_result_of
  <typename R::Construct_circular_max_vertex_2,Line_arc_2>::type
  //const Circular_arc_point_2 & right() const
  right() const
  {
        return typename R::Construct_circular_max_vertex_2()(*this);
  }

  typename Qualified_result_of
  <typename R::Construct_supporting_line_2,Line_arc_2>::type
  //const Line_2 & 
    supporting_line() const
  {
        return typename R::Construct_supporting_line_2()(*this);
  }
  

  bool is_vertical() const
  {
      return typename R::Is_vertical_2()(*this);
  }
    
  Bbox_2  bbox() const
  {
        return typename R::Construct_bbox_2()(*this);
  }

 };

template < typename CircularKernel >
inline
bool
operator==(const Line_arc_2<CircularKernel> &p,
           const Line_arc_2<CircularKernel> &q)
{
  return CircularKernel().equal_2_object()(p, q);
}

template < typename CircularKernel >
inline
bool
operator!=(const Line_arc_2<CircularKernel> &p,
           const Line_arc_2<CircularKernel> &q)
{
  return ! (p == q);
}


 template < typename CK >
    std::ostream &
    operator<<(std::ostream & os, const Line_arc_2<CK> &a)
    {
      
      return os << a.supporting_line() << " "
		<< a.source() << " "
		<< a.target() << " ";
    }

  template < typename CK >
  std::istream &
  operator>>(std::istream & is, Line_arc_2<CK> &a)
  {
    typename CK::Line_2 l;
    typename CK::Circular_arc_point_2 p1;
    typename CK::Circular_arc_point_2 p2;
    is >> l >> p1 >> p2 ;
    if (is)
      a = Line_arc_2<CK>(l, p1, p2);
    return is;
  }




} // namespace CGAL

#endif // CGAL_LINE_ARC_2_H