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1 | // Boost.Geometry (aka GGL, Generic Geometry Library) |
2 | ||
3 | // Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands. | |
4 | ||
5 | // Use, modification and distribution is subject to the Boost Software License, | |
6 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
7 | // http://www.boost.org/LICENSE_1_0.txt) | |
8 | ||
9 | #ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_RING_PROPERTIES_HPP | |
10 | #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_RING_PROPERTIES_HPP | |
11 | ||
12 | ||
13 | #include <boost/geometry/algorithms/area.hpp> | |
14 | #include <boost/geometry/algorithms/within.hpp> | |
15 | #include <boost/geometry/algorithms/detail/point_on_border.hpp> | |
16 | ||
17 | ||
18 | namespace boost { namespace geometry | |
19 | { | |
20 | ||
21 | ||
22 | #ifndef DOXYGEN_NO_DETAIL | |
23 | namespace detail { namespace overlay | |
24 | { | |
25 | ||
26 | template <typename Point> | |
27 | struct ring_properties | |
28 | { | |
29 | typedef Point point_type; | |
30 | typedef typename default_area_result<Point>::type area_type; | |
31 | ||
32 | bool valid; | |
33 | ||
34 | // Filled by "select_rings" | |
35 | Point point; | |
36 | area_type area; | |
37 | ||
38 | // Filled by "update_ring_selection" | |
39 | bool reversed; | |
40 | ||
41 | // Filled/used by "assign_rings" | |
42 | bool discarded; | |
43 | ring_identifier parent; | |
44 | area_type parent_area; | |
45 | std::vector<ring_identifier> children; | |
46 | ||
47 | inline ring_properties() | |
48 | : valid(false) | |
49 | , area(area_type()) | |
50 | , reversed(false) | |
51 | , discarded(false) | |
52 | , parent_area(-1) | |
53 | {} | |
54 | ||
55 | template <typename RingOrBox> | |
56 | inline ring_properties(RingOrBox const& ring_or_box) | |
57 | : reversed(false) | |
58 | , discarded(false) | |
59 | , parent_area(-1) | |
60 | { | |
61 | this->area = geometry::area(ring_or_box); | |
62 | // We should take a point somewhere in the middle of the ring, | |
63 | // to avoid taking a point on a (self)tangency, | |
64 | // in cases where multiple points come together | |
65 | valid = geometry::point_on_border(this->point, ring_or_box, true); | |
66 | } | |
67 | ||
68 | inline area_type get_area() const | |
69 | { | |
70 | return reversed ? -area : area; | |
71 | } | |
72 | }; | |
73 | ||
74 | }} // namespace detail::overlay | |
75 | #endif // DOXYGEN_NO_DETAIL | |
76 | ||
77 | ||
78 | }} // namespace boost::geometry | |
79 | ||
80 | ||
81 | #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_RING_PROPERTIES_HPP |