ceph/src/boost/boost/geometry/algorithms/detail/overlay/turn_info.hpp

   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_TURN_INFO_HPP
  10 #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_TURN_INFO_HPP
  11
  12
  13 #include <boost/array.hpp>
  14
  15 #include <boost/geometry/core/coordinate_type.hpp>
  16 #include <boost/geometry/algorithms/detail/signed_size_type.hpp>
  17 #include <boost/geometry/algorithms/detail/overlay/segment_identifier.hpp>
  18 #include <boost/geometry/algorithms/detail/overlay/overlay_type.hpp>
  19 #include <boost/geometry/policies/robustness/segment_ratio.hpp>
  20
  21 namespace boost { namespace geometry
  22 {
  23
  24 #ifndef DOXYGEN_NO_DETAIL
  25 namespace detail { namespace overlay
  26 {
  27
  28 enum method_type
  29 {
  30     method_none,
  31     method_disjoint,
  32     method_crosses,
  33     method_touch,
  34     method_touch_interior,
  35     method_collinear,
  36     method_equal,
  37     method_error
  38 };
  39
  40
  41 /*!
  42     \brief Turn operation: operation
  43     \details Information necessary for traversal phase (a phase
  44         of the overlay process). The information is gathered during the
  45         get_turns (segment intersection) phase.
  46         The class is to be included in the turn_info class, either direct
  47         or a derived or similar class with more (e.g. enrichment) information.
  48  */
  49 template <typename Point, typename SegmentRatio>
  50 struct turn_operation
  51 {
  52     typedef SegmentRatio segment_ratio_type;
  53
  54     operation_type operation;
  55     segment_identifier seg_id;
  56     SegmentRatio fraction;
  57
  58     typedef typename coordinate_type<Point>::type comparable_distance_type;
  59     comparable_distance_type remaining_distance;
  60
  61     inline turn_operation()
  62         : operation(operation_none)
  63         , remaining_distance(0)
  64     {}
  65 };
  66
  67
  68 /*!
  69     \brief Turn information: intersection point, method, and turn information
  70     \details Information necessary for traversal phase (a phase
  71         of the overlay process). The information is gathered during the
  72         get_turns (segment intersection) phase.
  73     \tparam Point point type of intersection point
  74     \tparam Operation gives classes opportunity to add additional info
  75     \tparam Container gives classes opportunity to define how operations are stored
  76  */
  77 template
  78 <
  79     typename Point,
  80     typename SegmentRatio = geometry::segment_ratio<typename coordinate_type<Point>::type>,
  81     typename Operation = turn_operation<Point, SegmentRatio>,
  82     typename Container = boost::array<Operation, 2>
  83 >
  84 struct turn_info
  85 {
  86     typedef Point point_type;
  87     typedef SegmentRatio segment_ratio_type;
  88     typedef Operation turn_operation_type;
  89     typedef Container container_type;
  90
  91     Point point;
  92     method_type method;
  93     bool touch_only; // True in case of method touch(interior) and lines do not cross
  94     signed_size_type cluster_id; // For multiple turns on same location, > 0. Else -1. 0 is unused.
  95     bool discarded;
  96     bool has_colocated_both; // Colocated with a uu turn (for union) or ii (other)
  97
  98     Container operations;
  99
 100     inline turn_info()
 101         : method(method_none)
 102         , touch_only(false)
 103         , cluster_id(-1)
 104         , discarded(false)
 105         , has_colocated_both(false)
 106     {}
 107
 108     inline bool both(operation_type type) const
 109     {
 110         return has12(type, type);
 111     }
 112
 113     inline bool has(operation_type type) const
 114     {
 115         return this->operations[0].operation == type
 116             || this->operations[1].operation == type;
 117     }
 118
 119     inline bool combination(operation_type type1, operation_type type2) const
 120     {
 121         return has12(type1, type2) || has12(type2, type1);
 122     }
 123
 124     inline bool blocked() const
 125     {
 126         return both(operation_blocked);
 127     }
 128     inline bool opposite() const
 129     {
 130         return both(operation_opposite);
 131     }
 132     inline bool any_blocked() const
 133     {
 134         return has(operation_blocked);
 135     }
 136     inline bool is_clustered() const
 137     {
 138         return cluster_id > 0;
 139     }
 140
 141 private :
 142     inline bool has12(operation_type type1, operation_type type2) const
 143     {
 144         return this->operations[0].operation == type1
 145             && this->operations[1].operation == type2
 146             ;
 147     }
 148
 149 };
 150
 151
 152 }} // namespace detail::overlay
 153 #endif //DOXYGEN_NO_DETAIL
 154
 155
 156 }} // namespace boost::geometry
 157
 158
 159 #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_TURN_INFO_HPP