1 // Boost.Geometry (aka GGL, Generic Geometry Library)
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.
7 // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
8 // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
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)
14 #ifndef BOOST_GEOMETRY_ALGORITHMS_ENVELOPE_HPP
15 #define BOOST_GEOMETRY_ALGORITHMS_ENVELOPE_HPP
19 #include <boost/numeric/conversion/cast.hpp>
20 #include <boost/range.hpp>
21 #include <boost/variant/static_visitor.hpp>
22 #include <boost/variant/apply_visitor.hpp>
23 #include <boost/variant/variant_fwd.hpp>
25 #include <boost/geometry/algorithms/assign.hpp>
26 #include <boost/geometry/algorithms/expand.hpp>
27 #include <boost/geometry/algorithms/not_implemented.hpp>
28 #include <boost/geometry/core/cs.hpp>
29 #include <boost/geometry/core/exterior_ring.hpp>
30 #include <boost/geometry/core/point_type.hpp>
31 #include <boost/geometry/core/tags.hpp>
33 #include <boost/geometry/geometries/concepts/check.hpp>
36 namespace boost { namespace geometry
39 #ifndef DOXYGEN_NO_DETAIL
40 namespace detail { namespace envelope
44 /// Calculate envelope of an 2D or 3D segment
45 struct envelope_expand_one
47 template<typename Geometry, typename Box>
48 static inline void apply(Geometry const& geometry, Box& mbr)
51 geometry::expand(mbr, geometry);
56 /// Iterate through range (also used in multi*)
57 template<typename Range, typename Box>
58 inline void envelope_range_additional(Range const& range, Box& mbr)
60 typedef typename boost::range_iterator<Range const>::type iterator_type;
62 for (iterator_type it = boost::begin(range);
63 it != boost::end(range);
66 geometry::expand(mbr, *it);
72 /// Generic range dispatching struct
75 /// Calculate envelope of range using a strategy
76 template <typename Range, typename Box>
77 static inline void apply(Range const& range, Box& mbr)
80 envelope_range_additional(range, mbr);
85 struct envelope_multi_linestring
87 template<typename MultiLinestring, typename Box>
88 static inline void apply(MultiLinestring const& mp, Box& mbr)
91 for (typename boost::range_iterator<MultiLinestring const>::type
96 envelope_range_additional(*it, mbr);
102 // version for multi_polygon: outer ring's of all polygons
103 struct envelope_multi_polygon
105 template<typename MultiPolygon, typename Box>
106 static inline void apply(MultiPolygon const& mp, Box& mbr)
109 for (typename boost::range_const_iterator<MultiPolygon>::type
114 envelope_range_additional(exterior_ring(*it), mbr);
120 }} // namespace detail::envelope
121 #endif // DOXYGEN_NO_DETAIL
123 #ifndef DOXYGEN_NO_DISPATCH
131 typename Tag = typename tag<Geometry>::type
133 struct envelope: not_implemented<Tag>
137 template <typename Point>
138 struct envelope<Point, point_tag>
139 : detail::envelope::envelope_expand_one
143 template <typename Box>
144 struct envelope<Box, box_tag>
145 : detail::envelope::envelope_expand_one
149 template <typename Segment>
150 struct envelope<Segment, segment_tag>
151 : detail::envelope::envelope_expand_one
155 template <typename Linestring>
156 struct envelope<Linestring, linestring_tag>
157 : detail::envelope::envelope_range
161 template <typename Ring>
162 struct envelope<Ring, ring_tag>
163 : detail::envelope::envelope_range
167 template <typename Polygon>
168 struct envelope<Polygon, polygon_tag>
169 : detail::envelope::envelope_range
171 template <typename Box>
172 static inline void apply(Polygon const& poly, Box& mbr)
174 // For polygon, inspecting outer ring is sufficient
175 detail::envelope::envelope_range::apply(exterior_ring(poly), mbr);
181 template <typename Multi>
182 struct envelope<Multi, multi_point_tag>
183 : detail::envelope::envelope_range
187 template <typename Multi>
188 struct envelope<Multi, multi_linestring_tag>
189 : detail::envelope::envelope_multi_linestring
193 template <typename Multi>
194 struct envelope<Multi, multi_polygon_tag>
195 : detail::envelope::envelope_multi_polygon
199 } // namespace dispatch
203 namespace resolve_variant {
205 template <typename Geometry>
208 template <typename Box>
209 static inline void apply(Geometry const& geometry, Box& box)
211 concept::check<Geometry const>();
212 concept::check<Box>();
214 dispatch::envelope<Geometry>::apply(geometry, box);
218 template <BOOST_VARIANT_ENUM_PARAMS(typename T)>
219 struct envelope<boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> >
221 template <typename Box>
222 struct visitor: boost::static_visitor<void>
226 visitor(Box& box): m_box(box) {}
228 template <typename Geometry>
229 void operator()(Geometry const& geometry) const
231 envelope<Geometry>::apply(geometry, m_box);
235 template <typename Box>
237 apply(boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> const& geometry,
240 boost::apply_visitor(visitor<Box>(box), geometry);
244 } // namespace resolve_variant
248 \brief \brief_calc{envelope}
250 \details \details_calc{envelope,\det_envelope}.
251 \tparam Geometry \tparam_geometry
252 \tparam Box \tparam_box
253 \param geometry \param_geometry
254 \param mbr \param_box \param_set{envelope}
256 \qbk{[include reference/algorithms/envelope.qbk]}
259 [envelope] [envelope_output]
262 template<typename Geometry, typename Box>
263 inline void envelope(Geometry const& geometry, Box& mbr)
265 resolve_variant::envelope<Geometry>::apply(geometry, mbr);
270 \brief \brief_calc{envelope}
272 \details \details_calc{return_envelope,\det_envelope}. \details_return{envelope}
273 \tparam Box \tparam_box
274 \tparam Geometry \tparam_geometry
275 \param geometry \param_geometry
276 \return \return_calc{envelope}
278 \qbk{[include reference/algorithms/envelope.qbk]}
281 [return_envelope] [return_envelope_output]
284 template<typename Box, typename Geometry>
285 inline Box return_envelope(Geometry const& geometry)
288 resolve_variant::envelope<Geometry>::apply(geometry, mbr);
292 }} // namespace boost::geometry
294 #endif // BOOST_GEOMETRY_ALGORITHMS_ENVELOPE_HPP