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1 | // Boost.Geometry (aka GGL, Generic Geometry Library) |
2 | ||
3 | // Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands. | |
4 | ||
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5 | // This file was modified by Oracle on 2018. |
6 | // Modifications copyright (c) 2018, Oracle and/or its affiliates. | |
7 | ||
8 | // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle | |
9 | ||
7c673cae FG |
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) | |
13 | ||
14 | #ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_CONVERT_RING_HPP | |
15 | #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_CONVERT_RING_HPP | |
16 | ||
7c673cae | 17 | #include <boost/mpl/assert.hpp> |
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18 | #include <boost/range/algorithm/reverse.hpp> |
19 | ||
92f5a8d4 TL |
20 | #include <boost/geometry/algorithms/convert.hpp> |
21 | #include <boost/geometry/algorithms/detail/ring_identifier.hpp> | |
22 | #include <boost/geometry/algorithms/num_points.hpp> | |
23 | ||
7c673cae FG |
24 | #include <boost/geometry/core/tags.hpp> |
25 | #include <boost/geometry/core/exterior_ring.hpp> | |
26 | #include <boost/geometry/core/interior_rings.hpp> | |
7c673cae FG |
27 | |
28 | namespace boost { namespace geometry | |
29 | { | |
30 | ||
31 | ||
32 | #ifndef DOXYGEN_NO_DETAIL | |
33 | namespace detail { namespace overlay | |
34 | { | |
35 | ||
36 | ||
37 | template<typename Tag> | |
38 | struct convert_ring | |
39 | { | |
40 | BOOST_MPL_ASSERT_MSG | |
41 | ( | |
42 | false, NOT_OR_NOT_YET_IMPLEMENTED_FOR_THIS_GEOMETRY_TAG | |
43 | , (types<Tag>) | |
44 | ); | |
45 | }; | |
46 | ||
47 | template<> | |
48 | struct convert_ring<ring_tag> | |
49 | { | |
50 | template<typename Destination, typename Source> | |
51 | static inline void apply(Destination& destination, Source const& source, | |
52 | bool append, bool reverse) | |
53 | { | |
54 | if (! append) | |
55 | { | |
56 | geometry::convert(source, destination); | |
57 | if (reverse) | |
58 | { | |
59 | boost::reverse(destination); | |
60 | } | |
61 | } | |
62 | } | |
63 | }; | |
64 | ||
65 | ||
66 | template<> | |
67 | struct convert_ring<polygon_tag> | |
68 | { | |
69 | template<typename Destination, typename Source> | |
70 | static inline void apply(Destination& destination, Source const& source, | |
71 | bool append, bool reverse) | |
72 | { | |
73 | if (! append) | |
74 | { | |
75 | geometry::convert(source, exterior_ring(destination)); | |
76 | if (reverse) | |
77 | { | |
78 | boost::reverse(exterior_ring(destination)); | |
79 | } | |
80 | } | |
81 | else | |
82 | { | |
83 | // Avoid adding interior rings which are invalid | |
84 | // because of its number of points: | |
85 | std::size_t const min_num_points | |
86 | = core_detail::closure::minimum_ring_size | |
87 | < | |
88 | geometry::closure<Destination>::value | |
89 | >::value; | |
90 | ||
91 | if (geometry::num_points(source) >= min_num_points) | |
92 | { | |
93 | interior_rings(destination).resize( | |
94 | interior_rings(destination).size() + 1); | |
95 | geometry::convert(source, interior_rings(destination).back()); | |
96 | if (reverse) | |
97 | { | |
98 | boost::reverse(interior_rings(destination).back()); | |
99 | } | |
100 | } | |
101 | } | |
102 | } | |
103 | }; | |
104 | ||
105 | ||
106 | }} // namespace detail::overlay | |
107 | #endif // DOXYGEN_NO_DETAIL | |
108 | ||
109 | ||
110 | }} // namespace boost::geometry | |
111 | ||
112 | ||
113 | #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_CONVERT_RING_HPP |