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1 | // Boost.Geometry (aka GGL, Generic Geometry Library) |
2 | ||
3 | // Copyright (c) 2007-2014 Barend Gehrels, Amsterdam, the Netherlands. | |
4 | // Copyright (c) 2008-2014 Bruno Lalande, Paris, France. | |
5 | // Copyright (c) 2009-2014 Mateusz Loskot, London, UK. | |
6 | // Copyright (c) 2014 Adam Wulkiewicz, Lodz, Poland. | |
7 | ||
8 | // This file was modified by Oracle on 2014. | |
9 | // Modifications copyright (c) 2014, Oracle and/or its affiliates. | |
10 | ||
11 | // Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle | |
12 | ||
13 | // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library | |
14 | // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands. | |
15 | ||
16 | // Use, modification and distribution is subject to the Boost Software License, | |
17 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
18 | // http://www.boost.org/LICENSE_1_0.txt) | |
19 | ||
20 | #ifndef BOOST_GEOMETRY_ALGORITHMS_NUM_POINTS_HPP | |
21 | #define BOOST_GEOMETRY_ALGORITHMS_NUM_POINTS_HPP | |
22 | ||
23 | #include <cstddef> | |
24 | ||
25 | #include <boost/mpl/size_t.hpp> | |
26 | ||
27 | #include <boost/range.hpp> | |
28 | ||
29 | #include <boost/variant/apply_visitor.hpp> | |
30 | #include <boost/variant/static_visitor.hpp> | |
31 | #include <boost/variant/variant_fwd.hpp> | |
32 | ||
33 | #include <boost/geometry/core/closure.hpp> | |
34 | #include <boost/geometry/core/coordinate_dimension.hpp> | |
35 | #include <boost/geometry/core/tag_cast.hpp> | |
36 | #include <boost/geometry/core/tags.hpp> | |
37 | ||
38 | #include <boost/geometry/algorithms/not_implemented.hpp> | |
39 | ||
40 | #include <boost/geometry/algorithms/detail/counting.hpp> | |
41 | ||
42 | #include <boost/geometry/geometries/concepts/check.hpp> | |
43 | ||
44 | ||
45 | namespace boost { namespace geometry | |
46 | { | |
47 | ||
48 | // Silence warning C4127: conditional expression is constant | |
49 | #if defined(_MSC_VER) | |
50 | #pragma warning(push) | |
51 | #pragma warning(disable : 4127) | |
52 | #endif | |
53 | ||
54 | ||
55 | #ifndef DOXYGEN_NO_DETAIL | |
56 | namespace detail { namespace num_points | |
57 | { | |
58 | ||
59 | ||
60 | template <bool AddForOpen> | |
61 | struct range_count | |
62 | { | |
63 | template <typename Range> | |
64 | static inline std::size_t apply(Range const& range) | |
65 | { | |
66 | std::size_t n = boost::size(range); | |
67 | if (AddForOpen | |
68 | && n > 0 | |
69 | && geometry::closure<Range>::value == open | |
70 | ) | |
71 | { | |
72 | return n + 1; | |
73 | } | |
74 | return n; | |
75 | } | |
76 | }; | |
77 | ||
78 | }} // namespace detail::num_points | |
79 | #endif // DOXYGEN_NO_DETAIL | |
80 | ||
81 | ||
82 | #ifndef DOXYGEN_NO_DISPATCH | |
83 | namespace dispatch | |
84 | { | |
85 | ||
86 | template | |
87 | < | |
88 | typename Geometry, | |
89 | bool AddForOpen, | |
90 | typename Tag = typename tag_cast | |
91 | < | |
92 | typename tag<Geometry>::type, multi_tag | |
93 | >::type | |
94 | > | |
95 | struct num_points: not_implemented<Tag> | |
96 | {}; | |
97 | ||
98 | template <typename Geometry, bool AddForOpen> | |
99 | struct num_points<Geometry, AddForOpen, point_tag> | |
100 | : detail::counting::other_count<1> | |
101 | {}; | |
102 | ||
103 | template <typename Geometry, bool AddForOpen> | |
104 | struct num_points<Geometry, AddForOpen, box_tag> | |
105 | : detail::counting::other_count<(1 << geometry::dimension<Geometry>::value)> | |
106 | {}; | |
107 | ||
108 | template <typename Geometry, bool AddForOpen> | |
109 | struct num_points<Geometry, AddForOpen, segment_tag> | |
110 | : detail::counting::other_count<2> | |
111 | {}; | |
112 | ||
113 | template <typename Geometry, bool AddForOpen> | |
114 | struct num_points<Geometry, AddForOpen, linestring_tag> | |
115 | : detail::num_points::range_count<AddForOpen> | |
116 | {}; | |
117 | ||
118 | template <typename Geometry, bool AddForOpen> | |
119 | struct num_points<Geometry, AddForOpen, ring_tag> | |
120 | : detail::num_points::range_count<AddForOpen> | |
121 | {}; | |
122 | ||
123 | template <typename Geometry, bool AddForOpen> | |
124 | struct num_points<Geometry, AddForOpen, polygon_tag> | |
125 | : detail::counting::polygon_count | |
126 | < | |
127 | detail::num_points::range_count<AddForOpen> | |
128 | > | |
129 | {}; | |
130 | ||
131 | template <typename Geometry, bool AddForOpen> | |
132 | struct num_points<Geometry, AddForOpen, multi_tag> | |
133 | : detail::counting::multi_count | |
134 | < | |
135 | num_points<typename boost::range_value<Geometry>::type, AddForOpen> | |
136 | > | |
137 | {}; | |
138 | ||
139 | } // namespace dispatch | |
140 | #endif | |
141 | ||
142 | ||
143 | namespace resolve_variant | |
144 | { | |
145 | ||
146 | template <typename Geometry> | |
147 | struct num_points | |
148 | { | |
149 | static inline std::size_t apply(Geometry const& geometry, | |
150 | bool add_for_open) | |
151 | { | |
152 | concepts::check<Geometry const>(); | |
153 | ||
154 | return add_for_open | |
155 | ? dispatch::num_points<Geometry, true>::apply(geometry) | |
156 | : dispatch::num_points<Geometry, false>::apply(geometry); | |
157 | } | |
158 | }; | |
159 | ||
160 | template <BOOST_VARIANT_ENUM_PARAMS(typename T)> | |
161 | struct num_points<boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> > | |
162 | { | |
163 | struct visitor: boost::static_visitor<std::size_t> | |
164 | { | |
165 | bool m_add_for_open; | |
166 | ||
167 | visitor(bool add_for_open): m_add_for_open(add_for_open) {} | |
168 | ||
169 | template <typename Geometry> | |
170 | inline std::size_t operator()(Geometry const& geometry) const | |
171 | { | |
172 | return num_points<Geometry>::apply(geometry, m_add_for_open); | |
173 | } | |
174 | }; | |
175 | ||
176 | static inline std::size_t | |
177 | apply(boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> const& geometry, | |
178 | bool add_for_open) | |
179 | { | |
180 | return boost::apply_visitor(visitor(add_for_open), geometry); | |
181 | } | |
182 | }; | |
183 | ||
184 | } // namespace resolve_variant | |
185 | ||
186 | ||
187 | /*! | |
188 | \brief \brief_calc{number of points} | |
189 | \ingroup num_points | |
190 | \details \details_calc{num_points, number of points}. | |
191 | \tparam Geometry \tparam_geometry | |
192 | \param geometry \param_geometry | |
193 | \param add_for_open add one for open geometries (i.e. polygon types which are not closed) | |
194 | \return \return_calc{number of points} | |
195 | ||
196 | \qbk{[include reference/algorithms/num_points.qbk]} | |
197 | */ | |
198 | template <typename Geometry> | |
199 | inline std::size_t num_points(Geometry const& geometry, bool add_for_open = false) | |
200 | { | |
201 | return resolve_variant::num_points<Geometry>::apply(geometry, add_for_open); | |
202 | } | |
203 | ||
204 | #if defined(_MSC_VER) | |
205 | #pragma warning(pop) | |
206 | #endif | |
207 | ||
208 | }} // namespace boost::geometry | |
209 | ||
210 | ||
211 | #endif // BOOST_GEOMETRY_ALGORITHMS_NUM_POINTS_HPP |