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1 | // Boost.Geometry |
2 | ||
3 | // Copyright (c) 2014 Oracle and/or its affiliates. | |
4 | ||
5 | // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle | |
6 | ||
7 | // Use, modification and distribution is subject to the Boost Software License, | |
8 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
9 | // http://www.boost.org/LICENSE_1_0.txt) | |
10 | ||
11 | #ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_FLATTENING_HPP | |
12 | #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_FLATTENING_HPP | |
13 | ||
14 | #include <boost/geometry/core/radius.hpp> | |
15 | #include <boost/geometry/core/tag.hpp> | |
16 | #include <boost/geometry/core/tags.hpp> | |
17 | ||
18 | #include <boost/geometry/algorithms/not_implemented.hpp> | |
19 | ||
20 | namespace boost { namespace geometry | |
21 | { | |
22 | ||
23 | #ifndef DOXYGEN_NO_DISPATCH | |
24 | namespace detail_dispatch | |
25 | { | |
26 | ||
27 | template <typename ResultType, typename Geometry, typename Tag = typename tag<Geometry>::type> | |
28 | struct flattening | |
29 | : not_implemented<Tag> | |
30 | {}; | |
31 | ||
32 | template <typename ResultType, typename Geometry> | |
33 | struct flattening<ResultType, Geometry, srs_sphere_tag> | |
34 | { | |
35 | static inline ResultType apply(Geometry const& /*geometry*/) | |
36 | { | |
37 | return ResultType(0); | |
38 | } | |
39 | }; | |
40 | ||
41 | template <typename ResultType, typename Geometry> | |
42 | struct flattening<ResultType, Geometry, srs_spheroid_tag> | |
43 | { | |
44 | static inline ResultType apply(Geometry const& geometry) | |
45 | { | |
46 | return ResultType(get_radius<0>(geometry) - get_radius<2>(geometry)) | |
47 | / ResultType(get_radius<0>(geometry)); | |
48 | } | |
49 | }; | |
50 | ||
51 | } // namespace detail_dispatch | |
52 | #endif // DOXYGEN_NO_DISPATCH | |
53 | ||
54 | #ifndef DOXYGEN_NO_DETAIL | |
55 | namespace detail | |
56 | { | |
57 | ||
58 | template <typename ResultType, typename Geometry> | |
59 | ResultType flattening(Geometry const& geometry) | |
60 | { | |
61 | return detail_dispatch::flattening<ResultType, Geometry>::apply(geometry); | |
62 | } | |
63 | ||
64 | } // namespace detail | |
65 | #endif // DOXYGEN_NO_DETAIL | |
66 | ||
67 | }} // namespace boost::geometry | |
68 | ||
69 | #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_FLATTENING_HPP |