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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 | ||
7 | // Licensed under the Boost Software License version 1.0. | |
8 | // http://www.boost.org/users/license.html | |
9 | ||
10 | #ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_IS_VALID_IS_ACCEPTABLE_TURN_HPP | |
11 | #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_IS_VALID_IS_ACCEPTABLE_TURN_HPP | |
12 | ||
13 | #include <boost/range.hpp> | |
14 | ||
15 | #include <boost/geometry/core/point_order.hpp> | |
16 | #include <boost/geometry/core/tag.hpp> | |
17 | #include <boost/geometry/core/tags.hpp> | |
18 | ||
19 | #include <boost/geometry/algorithms/detail/overlay/turn_info.hpp> | |
20 | ||
21 | ||
22 | namespace boost { namespace geometry | |
23 | { | |
24 | ||
25 | ||
26 | #ifndef DOXYGEN_NO_DETAIL | |
27 | namespace detail { namespace is_valid | |
28 | { | |
29 | ||
30 | ||
31 | template | |
32 | < | |
33 | typename Geometry, | |
34 | order_selector Order = geometry::point_order<Geometry>::value, | |
35 | typename Tag = typename tag<Geometry>::type | |
36 | > | |
37 | struct acceptable_operation | |
38 | {}; | |
39 | ||
40 | template <typename Polygon> | |
41 | struct acceptable_operation<Polygon, counterclockwise, polygon_tag> | |
42 | { | |
43 | static const detail::overlay::operation_type value = | |
44 | detail::overlay::operation_union; | |
45 | }; | |
46 | ||
47 | template <typename Polygon> | |
48 | struct acceptable_operation<Polygon, clockwise, polygon_tag> | |
49 | { | |
50 | static const detail::overlay::operation_type value = | |
51 | detail::overlay::operation_intersection; | |
52 | }; | |
53 | ||
54 | template <typename MultiPolygon> | |
55 | struct acceptable_operation<MultiPolygon, counterclockwise, multi_polygon_tag> | |
56 | { | |
57 | static const detail::overlay::operation_type value = | |
58 | detail::overlay::operation_intersection; | |
59 | }; | |
60 | ||
61 | template <typename MultiPolygon> | |
62 | struct acceptable_operation<MultiPolygon, clockwise, multi_polygon_tag> | |
63 | { | |
64 | static const detail::overlay::operation_type value = | |
65 | detail::overlay::operation_union; | |
66 | }; | |
67 | ||
68 | ||
69 | ||
70 | ||
71 | template <typename Geometry, typename Tag = typename tag<Geometry>::type> | |
72 | struct is_acceptable_turn | |
73 | {}; | |
74 | ||
75 | template <typename Ring> | |
76 | struct is_acceptable_turn<Ring, ring_tag> | |
77 | { | |
78 | template <typename Turn> | |
79 | static inline bool apply(Turn const&) | |
80 | { | |
81 | return false; | |
82 | } | |
83 | }; | |
84 | ||
85 | template <typename Polygon> | |
86 | class is_acceptable_turn<Polygon, polygon_tag> | |
87 | { | |
88 | protected: | |
89 | template <typename Turn, typename Method, typename Operation> | |
90 | static inline bool check_turn(Turn const& turn, | |
91 | Method method, | |
92 | Operation operation) | |
93 | { | |
94 | return turn.method == method | |
95 | && turn.operations[0].operation == operation | |
96 | && turn.operations[1].operation == operation; | |
97 | } | |
98 | ||
99 | ||
100 | public: | |
101 | template <typename Turn> | |
102 | static inline bool apply(Turn const& turn) | |
103 | { | |
104 | using namespace detail::overlay; | |
105 | ||
106 | if ( turn.operations[0].seg_id.ring_index | |
107 | == turn.operations[1].seg_id.ring_index ) | |
108 | { | |
109 | return false; | |
110 | } | |
111 | ||
112 | operation_type const op = acceptable_operation<Polygon>::value; | |
113 | ||
114 | return check_turn(turn, method_touch_interior, op) | |
115 | || check_turn(turn, method_touch, op) | |
116 | ; | |
117 | } | |
118 | }; | |
119 | ||
120 | template <typename MultiPolygon> | |
121 | class is_acceptable_turn<MultiPolygon, multi_polygon_tag> | |
122 | : is_acceptable_turn<typename boost::range_value<MultiPolygon>::type> | |
123 | { | |
124 | private: | |
125 | typedef typename boost::range_value<MultiPolygon>::type polygon; | |
126 | typedef is_acceptable_turn<polygon> base; | |
127 | ||
128 | public: | |
129 | template <typename Turn> | |
130 | static inline bool apply(Turn const& turn) | |
131 | { | |
132 | using namespace detail::overlay; | |
133 | ||
134 | if ( turn.operations[0].seg_id.multi_index | |
135 | == turn.operations[1].seg_id.multi_index ) | |
136 | { | |
137 | return base::apply(turn); | |
138 | } | |
139 | ||
140 | operation_type const op = acceptable_operation<MultiPolygon>::value; | |
141 | ||
142 | return base::check_turn(turn, method_touch_interior, op) | |
143 | || base::check_turn(turn, method_touch, op) | |
144 | ; | |
145 | } | |
146 | }; | |
147 | ||
148 | ||
149 | }} // namespace detail::is_valid | |
150 | #endif // DOXYGEN_NO_DETAIL | |
151 | ||
152 | }} // namespace boost::geometry | |
153 | ||
154 | #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_IS_VALID_IS_ACCEPTABLE_TURN_HPP |