101 lines
2.6 KiB
C++
101 lines
2.6 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
|
|
|
|
// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
|
|
// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
|
|
// Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
|
|
|
|
// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
|
|
// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
|
|
|
|
// Use, modification and distribution is subject to the Boost Software License,
|
|
// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
|
|
// http://www.boost.org/LICENSE_1_0.txt)
|
|
|
|
#ifndef BOOST_GEOMETRY_VIEWS_SEGMENT_VIEW_HPP
|
|
#define BOOST_GEOMETRY_VIEWS_SEGMENT_VIEW_HPP
|
|
|
|
|
|
#include <boost/range.hpp>
|
|
|
|
#include <boost/geometry/core/point_type.hpp>
|
|
#include <boost/geometry/views/detail/points_view.hpp>
|
|
#include <boost/geometry/algorithms/assign.hpp>
|
|
|
|
|
|
namespace boost { namespace geometry
|
|
{
|
|
|
|
|
|
/*!
|
|
\brief Makes a segment behave like a linestring or a range
|
|
\details Adapts a segment to the Boost.Range concept, enabling the user to
|
|
iterate the two segment points. The segment_view is registered as a LineString Concept
|
|
\tparam Segment \tparam_geometry{Segment}
|
|
\ingroup views
|
|
|
|
\qbk{before.synopsis,
|
|
[heading Model of]
|
|
[link geometry.reference.concepts.concept_linestring LineString Concept]
|
|
}
|
|
|
|
\qbk{[include reference/views/segment_view.qbk]}
|
|
|
|
*/
|
|
template <typename Segment>
|
|
struct segment_view
|
|
: public detail::points_view
|
|
<
|
|
typename geometry::point_type<Segment>::type,
|
|
2
|
|
>
|
|
{
|
|
typedef typename geometry::point_type<Segment>::type point_type;
|
|
|
|
/// Constructor accepting the segment to adapt
|
|
explicit segment_view(Segment const& segment)
|
|
: detail::points_view<point_type, 2>(copy_policy(segment))
|
|
{}
|
|
|
|
private :
|
|
|
|
class copy_policy
|
|
{
|
|
public :
|
|
inline copy_policy(Segment const& segment)
|
|
: m_segment(segment)
|
|
{}
|
|
|
|
inline void apply(point_type* points) const
|
|
{
|
|
geometry::detail::assign_point_from_index<0>(m_segment, points[0]);
|
|
geometry::detail::assign_point_from_index<1>(m_segment, points[1]);
|
|
}
|
|
private :
|
|
Segment const& m_segment;
|
|
};
|
|
|
|
};
|
|
|
|
|
|
#ifndef DOXYGEN_NO_TRAITS_SPECIALIZATIONS
|
|
|
|
// All segment ranges can be handled as linestrings
|
|
namespace traits
|
|
{
|
|
|
|
template<typename Segment>
|
|
struct tag<segment_view<Segment> >
|
|
{
|
|
typedef linestring_tag type;
|
|
};
|
|
|
|
}
|
|
|
|
#endif // DOXYGEN_NO_TRAITS_SPECIALIZATIONS
|
|
|
|
|
|
}} // namespace boost::geometry
|
|
|
|
|
|
#endif // BOOST_GEOMETRY_VIEWS_SEGMENT_VIEW_HPP
|