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1 | // Boost.Geometry (aka GGL, Generic Geometry Library) |
2 | ||
3 | // Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands. | |
4 | // Copyright (c) 2008-2012 Bruno Lalande, Paris, France. | |
5 | // Copyright (c) 2009-2012 Mateusz Loskot, London, UK. | |
6 | ||
7 | // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library | |
8 | // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands. | |
9 | ||
10 | // Use, modification and distribution is subject to the Boost Software License, | |
11 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
12 | // http://www.boost.org/LICENSE_1_0.txt) | |
13 | ||
14 | #ifndef BOOST_GEOMETRY_VIEWS_SEGMENT_VIEW_HPP | |
15 | #define BOOST_GEOMETRY_VIEWS_SEGMENT_VIEW_HPP | |
16 | ||
17 | ||
18 | #include <boost/range.hpp> | |
19 | ||
20 | #include <boost/geometry/core/point_type.hpp> | |
21 | #include <boost/geometry/views/detail/points_view.hpp> | |
22 | #include <boost/geometry/algorithms/assign.hpp> | |
23 | ||
24 | ||
25 | namespace boost { namespace geometry | |
26 | { | |
27 | ||
28 | ||
29 | /*! | |
30 | \brief Makes a segment behave like a linestring or a range | |
31 | \details Adapts a segment to the Boost.Range concept, enabling the user to | |
32 | iterate the two segment points. The segment_view is registered as a LineString Concept | |
33 | \tparam Segment \tparam_geometry{Segment} | |
34 | \ingroup views | |
35 | ||
36 | \qbk{before.synopsis, | |
37 | [heading Model of] | |
38 | [link geometry.reference.concepts.concept_linestring LineString Concept] | |
39 | } | |
40 | ||
41 | \qbk{[include reference/views/segment_view.qbk]} | |
42 | ||
43 | */ | |
44 | template <typename Segment> | |
45 | struct segment_view | |
46 | : public detail::points_view | |
47 | < | |
48 | typename geometry::point_type<Segment>::type, | |
49 | 2 | |
50 | > | |
51 | { | |
52 | typedef typename geometry::point_type<Segment>::type point_type; | |
53 | ||
54 | /// Constructor accepting the segment to adapt | |
55 | explicit segment_view(Segment const& segment) | |
56 | : detail::points_view<point_type, 2>(copy_policy(segment)) | |
57 | {} | |
58 | ||
59 | private : | |
60 | ||
61 | class copy_policy | |
62 | { | |
63 | public : | |
64 | inline copy_policy(Segment const& segment) | |
65 | : m_segment(segment) | |
66 | {} | |
67 | ||
68 | inline void apply(point_type* points) const | |
69 | { | |
70 | geometry::detail::assign_point_from_index<0>(m_segment, points[0]); | |
71 | geometry::detail::assign_point_from_index<1>(m_segment, points[1]); | |
72 | } | |
73 | private : | |
74 | Segment const& m_segment; | |
75 | }; | |
76 | ||
77 | }; | |
78 | ||
79 | ||
80 | #ifndef DOXYGEN_NO_TRAITS_SPECIALIZATIONS | |
81 | ||
82 | // All segment ranges can be handled as linestrings | |
83 | namespace traits | |
84 | { | |
85 | ||
86 | template<typename Segment> | |
87 | struct tag<segment_view<Segment> > | |
88 | { | |
89 | typedef linestring_tag type; | |
90 | }; | |
91 | ||
92 | } | |
93 | ||
94 | #endif // DOXYGEN_NO_TRAITS_SPECIALIZATIONS | |
95 | ||
96 | ||
97 | }} // namespace boost::geometry | |
98 | ||
99 | ||
100 | #endif // BOOST_GEOMETRY_VIEWS_SEGMENT_VIEW_HPP |