]>
Commit | Line | Data |
---|---|---|
7c673cae FG |
1 | // Boost.Geometry (aka GGL, Generic Geometry Library) |
2 | ||
92f5a8d4 | 3 | // Copyright (c) 2014-2019, Oracle and/or its affiliates. |
7c673cae FG |
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_SEGMENT_HPP | |
12 | #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_IS_VALID_SEGMENT_HPP | |
13 | ||
14 | #include <boost/core/ignore_unused.hpp> | |
15 | ||
16 | #include <boost/geometry/core/point_type.hpp> | |
17 | #include <boost/geometry/core/tags.hpp> | |
18 | ||
19 | #include <boost/geometry/algorithms/assign.hpp> | |
7c673cae | 20 | #include <boost/geometry/algorithms/validity_failure_type.hpp> |
92f5a8d4 | 21 | #include <boost/geometry/algorithms/detail/equals/point_point.hpp> |
7c673cae FG |
22 | #include <boost/geometry/algorithms/detail/is_valid/has_invalid_coordinate.hpp> |
23 | #include <boost/geometry/algorithms/dispatch/is_valid.hpp> | |
24 | ||
25 | ||
26 | namespace boost { namespace geometry | |
27 | { | |
28 | ||
29 | ||
30 | ||
31 | #ifndef DOXYGEN_NO_DISPATCH | |
32 | namespace dispatch | |
33 | { | |
34 | ||
35 | ||
36 | // A segment is a curve. | |
37 | // A curve is simple if it does not pass through the same point twice, | |
38 | // with the possible exception of its two endpoints | |
39 | // A curve is 1-dimensional, hence we have to check is the two | |
40 | // endpoints of the segment coincide, since in this case it is | |
41 | // 0-dimensional. | |
42 | // | |
43 | // Reference: OGC 06-103r4 (6.1.6.1) | |
44 | template <typename Segment> | |
45 | struct is_valid<Segment, segment_tag> | |
46 | { | |
b32b8144 FG |
47 | template <typename VisitPolicy, typename Strategy> |
48 | static inline bool apply(Segment const& segment, VisitPolicy& visitor, Strategy const&) | |
7c673cae | 49 | { |
92f5a8d4 TL |
50 | typedef typename Strategy::equals_point_point_strategy_type eq_pp_strategy_type; |
51 | ||
7c673cae FG |
52 | boost::ignore_unused(visitor); |
53 | ||
54 | typename point_type<Segment>::type p[2]; | |
55 | detail::assign_point_from_index<0>(segment, p[0]); | |
56 | detail::assign_point_from_index<1>(segment, p[1]); | |
57 | ||
58 | if (detail::is_valid::has_invalid_coordinate | |
59 | < | |
60 | Segment | |
61 | >::apply(segment, visitor)) | |
62 | { | |
63 | return false; | |
64 | } | |
92f5a8d4 TL |
65 | else if (! geometry::detail::equals::equals_point_point( |
66 | p[0], p[1], eq_pp_strategy_type())) | |
7c673cae FG |
67 | { |
68 | return visitor.template apply<no_failure>(); | |
69 | } | |
70 | else | |
71 | { | |
72 | return | |
73 | visitor.template apply<failure_wrong_topological_dimension>(); | |
74 | } | |
75 | } | |
76 | }; | |
77 | ||
78 | ||
79 | } // namespace dispatch | |
80 | #endif // DOXYGEN_NO_DISPATCH | |
81 | ||
82 | ||
83 | }} // namespace boost::geometry | |
84 | ||
85 | ||
86 | #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_IS_VALID_SEGMENT_HPP |