boost/geometry/strategies/cartesian/envelope.hpp

   1 // Boost.Geometry (aka GGL, Generic Geometry Library)
   2
   3 // Copyright (c) 2007-2015 Barend Gehrels, Amsterdam, the Netherlands.
   4 // Copyright (c) 2008-2015 Bruno Lalande, Paris, France.
   5 // Copyright (c) 2009-2015 Mateusz Loskot, London, UK.
   6
   7 // This file was modified by Oracle on 2015, 2016, 2018, 2019.
   8 // Modifications copyright (c) 2015-2019, Oracle and/or its affiliates.
   9
  10 // Contributed and/or modified by Vissarion Fysikopoulos, on behalf of Oracle
  11 // Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
  12 // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
  13
  14 // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
  15 // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
  16
  17 // Distributed under the Boost Software License, Version 1.0.
  18 // (See accompanying file LICENSE_1_0.txt or copy at
  19 // http://www.boost.org/LICENSE_1_0.txt)
  20
  21 #ifndef BOOST_GEOMETRY_STRATEGIES_CARTESIAN_ENVELOPE_HPP
  22 #define BOOST_GEOMETRY_STRATEGIES_CARTESIAN_ENVELOPE_HPP
  23
  24 #include <boost/range/begin.hpp>
  25 #include <boost/range/end.hpp>
  26
  27 #include <boost/geometry/algorithms/detail/envelope/initialize.hpp>
  28
  29 #include <boost/geometry/strategies/cartesian/envelope_box.hpp>
  30 #include <boost/geometry/strategies/cartesian/envelope_segment.hpp>
  31 #include <boost/geometry/strategies/cartesian/expand_box.hpp>
  32 #include <boost/geometry/strategies/cartesian/expand_segment.hpp>
  33
  34 namespace boost { namespace geometry
  35 {
  36
  37 namespace strategy { namespace envelope
  38 {
  39
  40 template <typename CalculationType = void>
  41 class cartesian
  42 {
  43 public:
  44     typedef cartesian_tag cs_tag;
  45
  46     typedef cartesian_point element_envelope_strategy_type;
  47     static inline element_envelope_strategy_type get_element_envelope_strategy()
  48     {
  49         return element_envelope_strategy_type();
  50     }
  51
  52     typedef expand::cartesian_point element_expand_strategy_type;
  53     static inline element_expand_strategy_type get_element_expand_strategy()
  54     {
  55         return element_expand_strategy_type();
  56     }
  57
  58     typedef expand::cartesian_box box_expand_strategy_type;
  59     static inline box_expand_strategy_type get_box_expand_strategy()
  60     {
  61         return box_expand_strategy_type();
  62     }
  63
  64     // Linestring, Ring, Polygon
  65
  66     template <typename Range>
  67     static inline typename boost::range_iterator<Range const>::type begin(Range const& range)
  68     {
  69         return boost::begin(range);
  70     }
  71
  72     template <typename Range>
  73     static inline typename boost::range_iterator<Range const>::type end(Range const& range)
  74     {
  75         return boost::end(range);
  76     }
  77
  78     // MultiLinestring, MultiPolygon
  79
  80     template <typename Box>
  81     struct multi_state
  82     {
  83         multi_state()
  84             : m_initialized(false)
  85         {}
  86
  87         void apply(Box const& single_box)
  88         {
  89             if (! m_initialized)
  90             {
  91                 m_box = single_box;
  92                 m_initialized = true;
  93             }
  94             else
  95             {
  96                 box_expand_strategy_type::apply(m_box, single_box);
  97             }
  98         }
  99
 100         void result(Box & box)
 101         {
 102             if (m_initialized)
 103             {
 104                 box = m_box;
 105             }
 106             else
 107             {
 108                 geometry::detail::envelope::initialize<Box, 0, dimension<Box>::value>::apply(box);
 109             }
 110         }
 111
 112     private:
 113         bool m_initialized;
 114         Box m_box;
 115     };
 116
 117     // Segment
 118
 119     template <typename Point1, typename Point2, typename Box>
 120     static inline void apply(Point1 const& point1, Point2 const& point2,
 121                              Box& box)
 122     {
 123         cartesian_segment<CalculationType>::apply(point1, point2, box);
 124     }
 125
 126     // Box
 127
 128     template <typename BoxIn, typename Box>
 129     static inline void apply(BoxIn const& box_in, Box& box)
 130     {
 131         cartesian_box::apply(box_in, box);
 132     }
 133 };
 134
 135 #ifndef DOXYGEN_NO_STRATEGY_SPECIALIZATIONS
 136
 137 namespace services
 138 {
 139
 140 template <typename Tag, typename CalculationType>
 141 struct default_strategy<Tag, cartesian_tag, CalculationType>
 142 {
 143     typedef strategy::envelope::cartesian<CalculationType> type;
 144 };
 145
 146 } // namespace services
 147
 148 #endif // DOXYGEN_NO_STRATEGY_SPECIALIZATIONS
 149
 150
 151 }} // namespace strategy::envelope
 152
 153 }} //namepsace boost::geometry
 154
 155 #endif // BOOST_GEOMETRY_STRATEGIES_CARTESIAN_ENVELOPE_HPP