projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
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_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> | |
| 20 | #include <boost/geometry/algorithms/equals.hpp> | |
| 21 | #include <boost/geometry/algorithms/validity_failure_type.hpp> | |
| 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 | { | |
| 47 | template <typename VisitPolicy> | |
| 48 | static inline bool apply(Segment const& segment, VisitPolicy& visitor) | |
| 49 | { | |
| 50 | boost::ignore_unused(visitor); | |
| 51 | ||
| 52 | typename point_type<Segment>::type p[2]; | |
| 53 | detail::assign_point_from_index<0>(segment, p[0]); | |
| 54 | detail::assign_point_from_index<1>(segment, p[1]); | |
| 55 | ||
| 56 | if (detail::is_valid::has_invalid_coordinate | |
| 57 | < | |
| 58 | Segment | |
| 59 | >::apply(segment, visitor)) | |
| 60 | { | |
| 61 | return false; | |
| 62 | } | |
| 63 | else if (! geometry::equals(p[0], p[1])) | |
| 64 | { | |
| 65 | return visitor.template apply<no_failure>(); | |
| 66 | } | |
| 67 | else | |
| 68 | { | |
| 69 | return | |
| 70 | visitor.template apply<failure_wrong_topological_dimension>(); | |
| 71 | } | |
| 72 | } | |
| 73 | }; | |
| 74 | ||
| 75 | ||
| 76 | } // namespace dispatch | |
| 77 | #endif // DOXYGEN_NO_DISPATCH | |
| 78 | ||
| 79 | ||
| 80 | }} // namespace boost::geometry | |
| 81 | ||
| 82 | ||
| 83 | #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_IS_VALID_SEGMENT_HPP |