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1 | // Boost.Geometry (aka GGL, Generic Geometry Library) |
2 | ||
3 | // Copyright (c) 2014-2015, Oracle and/or its affiliates. | |
4 | ||
5 | // Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle | |
6 | // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle | |
7 | ||
8 | // Licensed under the Boost Software License version 1.0. | |
9 | // http://www.boost.org/users/license.html | |
10 | ||
11 | #ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_IS_VALID_BOX_HPP | |
12 | #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_IS_VALID_BOX_HPP | |
13 | ||
14 | #include <cstddef> | |
15 | ||
16 | #include <boost/core/ignore_unused.hpp> | |
17 | ||
18 | #include <boost/geometry/core/access.hpp> | |
19 | #include <boost/geometry/core/tags.hpp> | |
20 | #include <boost/geometry/core/coordinate_dimension.hpp> | |
21 | ||
22 | #include <boost/geometry/algorithms/validity_failure_type.hpp> | |
23 | #include <boost/geometry/algorithms/detail/is_valid/has_invalid_coordinate.hpp> | |
24 | #include <boost/geometry/algorithms/dispatch/is_valid.hpp> | |
25 | ||
26 | ||
27 | namespace boost { namespace geometry | |
28 | { | |
29 | ||
30 | ||
31 | #ifndef DOXYGEN_NO_DETAIL | |
32 | namespace detail { namespace is_valid | |
33 | { | |
34 | ||
35 | template <typename Box, std::size_t I> | |
36 | struct has_valid_corners | |
37 | { | |
38 | template <typename VisitPolicy> | |
39 | static inline bool apply(Box const& box, VisitPolicy& visitor) | |
40 | { | |
41 | if (math::equals(geometry::get<geometry::min_corner, I-1>(box), | |
42 | geometry::get<geometry::max_corner, I-1>(box))) | |
43 | { | |
44 | return | |
45 | visitor.template apply<failure_wrong_topological_dimension>(); | |
46 | } | |
47 | else if (geometry::get<geometry::min_corner, I-1>(box) | |
48 | > | |
49 | geometry::get<geometry::max_corner, I-1>(box)) | |
50 | { | |
51 | return visitor.template apply<failure_wrong_corner_order>(); | |
52 | } | |
53 | return has_valid_corners<Box, I-1>::apply(box, visitor); | |
54 | } | |
55 | }; | |
56 | ||
57 | ||
58 | template <typename Box> | |
59 | struct has_valid_corners<Box, 0> | |
60 | { | |
61 | template <typename VisitPolicy> | |
62 | static inline bool apply(Box const&, VisitPolicy& visitor) | |
63 | { | |
64 | boost::ignore_unused(visitor); | |
65 | ||
66 | return visitor.template apply<no_failure>(); | |
67 | } | |
68 | }; | |
69 | ||
70 | ||
71 | template <typename Box> | |
72 | struct is_valid_box | |
73 | { | |
74 | template <typename VisitPolicy> | |
75 | static inline bool apply(Box const& box, VisitPolicy& visitor) | |
76 | { | |
77 | return | |
78 | ! has_invalid_coordinate<Box>::apply(box, visitor) | |
79 | && | |
80 | has_valid_corners<Box, dimension<Box>::value>::apply(box, visitor); | |
81 | } | |
82 | }; | |
83 | ||
84 | }} // namespace detail::is_valid | |
85 | #endif // DOXYGEN_NO_DETAIL | |
86 | ||
87 | ||
88 | ||
89 | #ifndef DOXYGEN_NO_DISPATCH | |
90 | namespace dispatch | |
91 | { | |
92 | ||
93 | ||
94 | // A box is always simple | |
95 | // A box is a Polygon, and it satisfies the conditions for Polygon validity. | |
96 | // | |
97 | // The only thing we have to check is whether the max corner lies in | |
98 | // the upper-right quadrant as defined by the min corner | |
99 | // | |
100 | // Reference (for polygon validity): OGC 06-103r4 (6.1.11.1) | |
101 | template <typename Box> | |
102 | struct is_valid<Box, box_tag> | |
103 | : detail::is_valid::is_valid_box<Box> | |
104 | {}; | |
105 | ||
106 | ||
107 | } // namespace dispatch | |
108 | #endif // DOXYGEN_NO_DISPATCH | |
109 | ||
110 | ||
111 | ||
112 | }} // namespace boost::geometry | |
113 | ||
114 | ||
115 | #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_IS_VALID_BOX_HPP |