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>
applyboost::geometry::detail::num_points::range_count64 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 {
applyboost::geometry::resolve_variant::num_points149 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
visitorboost::geometry::resolve_variant::num_points::visitor167 visitor(bool add_for_open): m_add_for_open(add_for_open) {}
168
169 template <typename Geometry>
operator ()boost::geometry::resolve_variant::num_points::visitor170 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
applyboost::geometry::resolve_variant::num_points177 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>
num_points(Geometry const & geometry,bool add_for_open=false)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
212