]>
Commit | Line | Data |
---|---|---|
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 | // Copyright (c) 2014 Adam Wulkiewicz, Lodz, Poland. | |
7 | ||
8 | // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library | |
9 | // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands. | |
10 | ||
11 | // Use, modification and distribution is subject to the Boost Software License, | |
12 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
13 | // http://www.boost.org/LICENSE_1_0.txt) | |
14 | ||
15 | #ifndef BOOST_GEOMETRY_ALGORITHMS_REVERSE_HPP | |
16 | #define BOOST_GEOMETRY_ALGORITHMS_REVERSE_HPP | |
17 | ||
18 | #include <algorithm> | |
19 | ||
20 | #include <boost/range.hpp> | |
21 | #include <boost/type_traits/remove_reference.hpp> | |
22 | ||
23 | #include <boost/variant/apply_visitor.hpp> | |
24 | #include <boost/variant/static_visitor.hpp> | |
25 | #include <boost/variant/variant_fwd.hpp> | |
26 | ||
27 | #include <boost/geometry/algorithms/detail/interior_iterator.hpp> | |
28 | #include <boost/geometry/algorithms/detail/multi_modify.hpp> | |
29 | #include <boost/geometry/core/interior_rings.hpp> | |
30 | #include <boost/geometry/core/tags.hpp> | |
31 | #include <boost/geometry/geometries/concepts/check.hpp> | |
32 | ||
33 | ||
34 | namespace boost { namespace geometry | |
35 | { | |
36 | ||
37 | ||
38 | #ifndef DOXYGEN_NO_DETAIL | |
39 | namespace detail { namespace reverse | |
40 | { | |
41 | ||
42 | ||
43 | struct range_reverse | |
44 | { | |
45 | template <typename Range> | |
46 | static inline void apply(Range& range) | |
47 | { | |
48 | std::reverse(boost::begin(range), boost::end(range)); | |
49 | } | |
50 | }; | |
51 | ||
52 | ||
53 | struct polygon_reverse: private range_reverse | |
54 | { | |
55 | template <typename Polygon> | |
56 | static inline void apply(Polygon& polygon) | |
57 | { | |
58 | range_reverse::apply(exterior_ring(polygon)); | |
59 | ||
60 | typename interior_return_type<Polygon>::type | |
61 | rings = interior_rings(polygon); | |
62 | ||
63 | for (typename detail::interior_iterator<Polygon>::type | |
64 | it = boost::begin(rings); it != boost::end(rings); ++it) | |
65 | { | |
66 | range_reverse::apply(*it); | |
67 | } | |
68 | } | |
69 | }; | |
70 | ||
71 | ||
72 | }} // namespace detail::reverse | |
73 | #endif // DOXYGEN_NO_DETAIL | |
74 | ||
75 | ||
76 | #ifndef DOXYGEN_NO_DISPATCH | |
77 | namespace dispatch | |
78 | { | |
79 | ||
80 | ||
81 | template <typename Geometry, typename Tag = typename tag<Geometry>::type> | |
82 | struct reverse | |
83 | { | |
84 | static inline void apply(Geometry&) | |
85 | {} | |
86 | }; | |
87 | ||
88 | ||
89 | template <typename Ring> | |
90 | struct reverse<Ring, ring_tag> | |
91 | : detail::reverse::range_reverse | |
92 | {}; | |
93 | ||
94 | ||
95 | template <typename LineString> | |
96 | struct reverse<LineString, linestring_tag> | |
97 | : detail::reverse::range_reverse | |
98 | {}; | |
99 | ||
100 | ||
101 | template <typename Polygon> | |
102 | struct reverse<Polygon, polygon_tag> | |
103 | : detail::reverse::polygon_reverse | |
104 | {}; | |
105 | ||
106 | ||
107 | template <typename Geometry> | |
108 | struct reverse<Geometry, multi_linestring_tag> | |
109 | : detail::multi_modify | |
110 | < | |
111 | Geometry, | |
112 | detail::reverse::range_reverse | |
113 | > | |
114 | {}; | |
115 | ||
116 | ||
117 | template <typename Geometry> | |
118 | struct reverse<Geometry, multi_polygon_tag> | |
119 | : detail::multi_modify | |
120 | < | |
121 | Geometry, | |
122 | detail::reverse::polygon_reverse | |
123 | > | |
124 | {}; | |
125 | ||
126 | ||
127 | ||
128 | } // namespace dispatch | |
129 | #endif | |
130 | ||
131 | ||
132 | namespace resolve_variant | |
133 | { | |
134 | ||
135 | template <typename Geometry> | |
136 | struct reverse | |
137 | { | |
138 | static void apply(Geometry& geometry) | |
139 | { | |
140 | concepts::check<Geometry>(); | |
141 | dispatch::reverse<Geometry>::apply(geometry); | |
142 | } | |
143 | }; | |
144 | ||
145 | template <BOOST_VARIANT_ENUM_PARAMS(typename T)> | |
146 | struct reverse<boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> > | |
147 | { | |
148 | struct visitor: boost::static_visitor<void> | |
149 | { | |
150 | template <typename Geometry> | |
151 | void operator()(Geometry& geometry) const | |
152 | { | |
153 | reverse<Geometry>::apply(geometry); | |
154 | } | |
155 | }; | |
156 | ||
157 | static inline void apply(boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>& geometry) | |
158 | { | |
159 | boost::apply_visitor(visitor(), geometry); | |
160 | } | |
161 | }; | |
162 | ||
163 | } // namespace resolve_variant | |
164 | ||
165 | ||
166 | /*! | |
167 | \brief Reverses the points within a geometry | |
168 | \details Generic function to reverse a geometry. It resembles the std::reverse | |
169 | functionality, but it takes the geometry type into account. Only for a ring | |
170 | or for a linestring it is the same as the std::reverse. | |
171 | \ingroup reverse | |
172 | \tparam Geometry \tparam_geometry | |
173 | \param geometry \param_geometry which will be reversed | |
174 | ||
175 | \qbk{[include reference/algorithms/reverse.qbk]} | |
176 | */ | |
177 | template <typename Geometry> | |
178 | inline void reverse(Geometry& geometry) | |
179 | { | |
180 | resolve_variant::reverse<Geometry>::apply(geometry); | |
181 | } | |
182 | ||
183 | }} // namespace boost::geometry | |
184 | ||
185 | ||
186 | #endif // BOOST_GEOMETRY_ALGORITHMS_REVERSE_HPP |