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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 | ||
7 | // This file was modified by Oracle on 2014. | |
8 | // Modifications copyright (c) 2014, Oracle and/or its affiliates. | |
9 | ||
10 | // Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle | |
11 | ||
12 | // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library | |
13 | // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands. | |
14 | ||
15 | // Use, modification and distribution is subject to the Boost Software License, | |
16 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
17 | // http://www.boost.org/LICENSE_1_0.txt) | |
18 | ||
19 | #ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_COMPARABLE_DISTANCE_INTERFACE_HPP | |
20 | #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_COMPARABLE_DISTANCE_INTERFACE_HPP | |
21 | ||
22 | #include <boost/geometry/geometries/concepts/check.hpp> | |
23 | ||
24 | #include <boost/geometry/strategies/comparable_distance_result.hpp> | |
25 | #include <boost/geometry/strategies/default_comparable_distance_result.hpp> | |
26 | #include <boost/geometry/strategies/distance.hpp> | |
27 | ||
28 | #include <boost/geometry/algorithms/detail/distance/interface.hpp> | |
29 | ||
30 | ||
31 | namespace boost { namespace geometry | |
32 | { | |
33 | ||
34 | ||
35 | namespace resolve_strategy | |
36 | { | |
37 | ||
38 | struct comparable_distance | |
39 | { | |
40 | template <typename Geometry1, typename Geometry2, typename Strategy> | |
41 | static inline | |
42 | typename comparable_distance_result<Geometry1, Geometry2, Strategy>::type | |
43 | apply(Geometry1 const& geometry1, | |
44 | Geometry2 const& geometry2, | |
45 | Strategy const& strategy) | |
46 | { | |
47 | typedef typename strategy::distance::services::comparable_type | |
48 | < | |
49 | Strategy | |
50 | >::type comparable_strategy_type; | |
51 | ||
52 | return dispatch::distance | |
53 | < | |
54 | Geometry1, Geometry2, comparable_strategy_type | |
55 | >::apply(geometry1, | |
56 | geometry2, | |
57 | strategy::distance::services::get_comparable | |
58 | < | |
59 | Strategy | |
60 | >::apply(strategy)); | |
61 | } | |
62 | ||
63 | template <typename Geometry1, typename Geometry2> | |
64 | static inline typename comparable_distance_result | |
65 | < | |
66 | Geometry1, Geometry2, default_strategy | |
67 | >::type | |
68 | apply(Geometry1 const& geometry1, | |
69 | Geometry2 const& geometry2, | |
70 | default_strategy) | |
71 | { | |
72 | typedef typename strategy::distance::services::comparable_type | |
73 | < | |
74 | typename detail::distance::default_strategy | |
75 | < | |
76 | Geometry1, Geometry2 | |
77 | >::type | |
78 | >::type comparable_strategy_type; | |
79 | ||
80 | return dispatch::distance | |
81 | < | |
82 | Geometry1, Geometry2, comparable_strategy_type | |
83 | >::apply(geometry1, geometry2, comparable_strategy_type()); | |
84 | } | |
85 | }; | |
86 | ||
87 | } // namespace resolve_strategy | |
88 | ||
89 | ||
90 | namespace resolve_variant | |
91 | { | |
92 | ||
93 | ||
94 | template <typename Geometry1, typename Geometry2> | |
95 | struct comparable_distance | |
96 | { | |
97 | template <typename Strategy> | |
98 | static inline | |
99 | typename comparable_distance_result<Geometry1, Geometry2, Strategy>::type | |
100 | apply(Geometry1 const& geometry1, | |
101 | Geometry2 const& geometry2, | |
102 | Strategy const& strategy) | |
103 | { | |
104 | return resolve_strategy::comparable_distance::apply(geometry1, | |
105 | geometry2, | |
106 | strategy); | |
107 | } | |
108 | }; | |
109 | ||
110 | ||
111 | template <BOOST_VARIANT_ENUM_PARAMS(typename T), typename Geometry2> | |
112 | struct comparable_distance | |
113 | < | |
114 | boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>, | |
115 | Geometry2 | |
116 | > | |
117 | { | |
118 | template <typename Strategy> | |
119 | struct visitor: static_visitor | |
120 | < | |
121 | typename comparable_distance_result | |
122 | < | |
123 | boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>, | |
124 | Geometry2, | |
125 | Strategy | |
126 | >::type | |
127 | > | |
128 | { | |
129 | Geometry2 const& m_geometry2; | |
130 | Strategy const& m_strategy; | |
131 | ||
132 | visitor(Geometry2 const& geometry2, | |
133 | Strategy const& strategy) | |
134 | : m_geometry2(geometry2), | |
135 | m_strategy(strategy) | |
136 | {} | |
137 | ||
138 | template <typename Geometry1> | |
139 | typename comparable_distance_result | |
140 | < | |
141 | Geometry1, Geometry2, Strategy | |
142 | >::type | |
143 | operator()(Geometry1 const& geometry1) const | |
144 | { | |
145 | return comparable_distance | |
146 | < | |
147 | Geometry1, | |
148 | Geometry2 | |
149 | >::template apply | |
150 | < | |
151 | Strategy | |
152 | >(geometry1, m_geometry2, m_strategy); | |
153 | } | |
154 | }; | |
155 | ||
156 | template <typename Strategy> | |
157 | static inline typename comparable_distance_result | |
158 | < | |
159 | boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>, | |
160 | Geometry2, | |
161 | Strategy | |
162 | >::type | |
163 | apply(boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> const& geometry1, | |
164 | Geometry2 const& geometry2, | |
165 | Strategy const& strategy) | |
166 | { | |
167 | return boost::apply_visitor(visitor<Strategy>(geometry2, strategy), geometry1); | |
168 | } | |
169 | }; | |
170 | ||
171 | ||
172 | template <typename Geometry1, BOOST_VARIANT_ENUM_PARAMS(typename T)> | |
173 | struct comparable_distance | |
174 | < | |
175 | Geometry1, | |
176 | boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> | |
177 | > | |
178 | { | |
179 | template <typename Strategy> | |
180 | struct visitor: static_visitor | |
181 | < | |
182 | typename comparable_distance_result | |
183 | < | |
184 | Geometry1, | |
185 | boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>, | |
186 | Strategy | |
187 | >::type | |
188 | > | |
189 | { | |
190 | Geometry1 const& m_geometry1; | |
191 | Strategy const& m_strategy; | |
192 | ||
193 | visitor(Geometry1 const& geometry1, | |
194 | Strategy const& strategy) | |
195 | : m_geometry1(geometry1), | |
196 | m_strategy(strategy) | |
197 | {} | |
198 | ||
199 | template <typename Geometry2> | |
200 | typename comparable_distance_result | |
201 | < | |
202 | Geometry1, Geometry2, Strategy | |
203 | >::type | |
204 | operator()(Geometry2 const& geometry2) const | |
205 | { | |
206 | return comparable_distance | |
207 | < | |
208 | Geometry1, | |
209 | Geometry2 | |
210 | >::template apply | |
211 | < | |
212 | Strategy | |
213 | >(m_geometry1, geometry2, m_strategy); | |
214 | } | |
215 | }; | |
216 | ||
217 | template <typename Strategy> | |
218 | static inline typename comparable_distance_result | |
219 | < | |
220 | Geometry1, | |
221 | boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>, | |
222 | Strategy | |
223 | >::type | |
224 | apply(Geometry1 const& geometry1, | |
225 | boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> const& geometry2, | |
226 | Strategy const& strategy) | |
227 | { | |
228 | return boost::apply_visitor(visitor<Strategy>(geometry1, strategy), geometry2); | |
229 | } | |
230 | }; | |
231 | ||
232 | ||
233 | template | |
234 | < | |
235 | BOOST_VARIANT_ENUM_PARAMS(typename T1), | |
236 | BOOST_VARIANT_ENUM_PARAMS(typename T2) | |
237 | > | |
238 | struct comparable_distance | |
239 | < | |
240 | boost::variant<BOOST_VARIANT_ENUM_PARAMS(T1)>, | |
241 | boost::variant<BOOST_VARIANT_ENUM_PARAMS(T2)> | |
242 | > | |
243 | { | |
244 | template <typename Strategy> | |
245 | struct visitor: static_visitor | |
246 | < | |
247 | typename comparable_distance_result | |
248 | < | |
249 | boost::variant<BOOST_VARIANT_ENUM_PARAMS(T1)>, | |
250 | boost::variant<BOOST_VARIANT_ENUM_PARAMS(T2)>, | |
251 | Strategy | |
252 | >::type | |
253 | > | |
254 | { | |
255 | Strategy const& m_strategy; | |
256 | ||
257 | visitor(Strategy const& strategy) | |
258 | : m_strategy(strategy) | |
259 | {} | |
260 | ||
261 | template <typename Geometry1, typename Geometry2> | |
262 | typename comparable_distance_result | |
263 | < | |
264 | Geometry1, Geometry2, Strategy | |
265 | >::type | |
266 | operator()(Geometry1 const& geometry1, Geometry2 const& geometry2) const | |
267 | { | |
268 | return comparable_distance | |
269 | < | |
270 | Geometry1, | |
271 | Geometry2 | |
272 | >::template apply | |
273 | < | |
274 | Strategy | |
275 | >(geometry1, geometry2, m_strategy); | |
276 | } | |
277 | }; | |
278 | ||
279 | template <typename Strategy> | |
280 | static inline typename comparable_distance_result | |
281 | < | |
282 | boost::variant<BOOST_VARIANT_ENUM_PARAMS(T1)>, | |
283 | boost::variant<BOOST_VARIANT_ENUM_PARAMS(T2)>, | |
284 | Strategy | |
285 | >::type | |
286 | apply(boost::variant<BOOST_VARIANT_ENUM_PARAMS(T1)> const& geometry1, | |
287 | boost::variant<BOOST_VARIANT_ENUM_PARAMS(T2)> const& geometry2, | |
288 | Strategy const& strategy) | |
289 | { | |
290 | return boost::apply_visitor(visitor<Strategy>(strategy), geometry1, geometry2); | |
291 | } | |
292 | }; | |
293 | ||
294 | } // namespace resolve_variant | |
295 | ||
296 | ||
297 | ||
298 | /*! | |
299 | \brief \brief_calc2{comparable distance measurement} \brief_strategy | |
300 | \ingroup distance | |
301 | \details The free function comparable_distance does not necessarily calculate the distance, | |
302 | but it calculates a distance measure such that two distances are comparable to each other. | |
303 | For example: for the Cartesian coordinate system, Pythagoras is used but the square root | |
304 | is not taken, which makes it faster and the results of two point pairs can still be | |
305 | compared to each other. | |
306 | \tparam Geometry1 first geometry type | |
307 | \tparam Geometry2 second geometry type | |
308 | \tparam Strategy \tparam_strategy{Distance} | |
309 | \param geometry1 \param_geometry | |
310 | \param geometry2 \param_geometry | |
311 | \param strategy \param_strategy{distance} | |
312 | \return \return_calc{comparable distance} | |
313 | ||
314 | \qbk{distinguish,with strategy} | |
315 | */ | |
316 | template <typename Geometry1, typename Geometry2, typename Strategy> | |
317 | inline typename comparable_distance_result<Geometry1, Geometry2, Strategy>::type | |
318 | comparable_distance(Geometry1 const& geometry1, Geometry2 const& geometry2, | |
319 | Strategy const& strategy) | |
320 | { | |
321 | concepts::check<Geometry1 const>(); | |
322 | concepts::check<Geometry2 const>(); | |
323 | ||
324 | return resolve_variant::comparable_distance | |
325 | < | |
326 | Geometry1, | |
327 | Geometry2 | |
328 | >::apply(geometry1, geometry2, strategy); | |
329 | } | |
330 | ||
331 | ||
332 | ||
333 | /*! | |
334 | \brief \brief_calc2{comparable distance measurement} | |
335 | \ingroup distance | |
336 | \details The free function comparable_distance does not necessarily calculate the distance, | |
337 | but it calculates a distance measure such that two distances are comparable to each other. | |
338 | For example: for the Cartesian coordinate system, Pythagoras is used but the square root | |
339 | is not taken, which makes it faster and the results of two point pairs can still be | |
340 | compared to each other. | |
341 | \tparam Geometry1 first geometry type | |
342 | \tparam Geometry2 second geometry type | |
343 | \param geometry1 \param_geometry | |
344 | \param geometry2 \param_geometry | |
345 | \return \return_calc{comparable distance} | |
346 | ||
347 | \qbk{[include reference/algorithms/comparable_distance.qbk]} | |
348 | */ | |
349 | template <typename Geometry1, typename Geometry2> | |
350 | inline typename default_comparable_distance_result<Geometry1, Geometry2>::type | |
351 | comparable_distance(Geometry1 const& geometry1, Geometry2 const& geometry2) | |
352 | { | |
353 | concepts::check<Geometry1 const>(); | |
354 | concepts::check<Geometry2 const>(); | |
355 | ||
356 | return geometry::comparable_distance(geometry1, geometry2, default_strategy()); | |
357 | } | |
358 | ||
359 | ||
360 | }} // namespace boost::geometry | |
361 | ||
362 | ||
363 | #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_COMPARABLE_DISTANCE_INTERFACE_HPP |