ceph/src/boost/boost/geometry/algorithms/detail/assign_box_corners.hpp

   1 // Boost.Geometry (aka GGL, Generic Geometry Library)
   2
   3 // Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
   4 // Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
   5 // Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
   6
   7 // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
   8 // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
   9
  10 // Use, modification and distribution is subject to the Boost Software License,
  11 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
  12 // http://www.boost.org/LICENSE_1_0.txt)
  13
  14 #ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_ASSIGN_BOX_CORNERS_HPP
  15 #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_ASSIGN_BOX_CORNERS_HPP
  16
  17
  18 #include <cstddef>
  19
  20 #include <boost/geometry/geometries/concepts/check.hpp>
  21 #include <boost/geometry/algorithms/detail/assign_values.hpp>
  22 #include <boost/geometry/util/range.hpp>
  23
  24
  25 namespace boost { namespace geometry
  26 {
  27
  28 #ifndef DOXYGEN_NO_DETAIL
  29 namespace detail
  30 {
  31 // Note: this is moved to namespace detail because the names and parameter orders
  32 // are not yet 100% clear.
  33
  34 /*!
  35 \brief Assign the four points of a 2D box
  36 \ingroup assign
  37 \note The order is crucial. Most logical is LOWER, UPPER and sub-order LEFT, RIGHT
  38     so this is how it is implemented.
  39 \tparam Box \tparam_box
  40 \tparam Point \tparam_point
  41 \param box \param_box
  42 \param lower_left point being assigned to lower left coordinates of the box
  43 \param lower_right point being assigned to lower right coordinates of the box
  44 \param upper_left point being assigned to upper left coordinates of the box
  45 \param upper_right point being assigned to upper right coordinates of the box
  46
  47 \qbk{
  48 [heading Example]
  49 [assign_box_corners] [assign_box_corners_output]
  50 }
  51 */
  52 template <typename Box, typename Point>
  53 inline void assign_box_corners(Box const& box,
  54         Point& lower_left, Point& lower_right,
  55         Point& upper_left, Point& upper_right)
  56 {
  57     concepts::check<Box const>();
  58     concepts::check<Point>();
  59
  60     detail::assign::assign_box_2d_corner
  61             <min_corner, min_corner>(box, lower_left);
  62     detail::assign::assign_box_2d_corner
  63             <max_corner, min_corner>(box, lower_right);
  64     detail::assign::assign_box_2d_corner
  65             <min_corner, max_corner>(box, upper_left);
  66     detail::assign::assign_box_2d_corner
  67             <max_corner, max_corner>(box, upper_right);
  68 }
  69
  70 // Silence warning C4127: conditional expression is constant
  71 #if defined(_MSC_VER)
  72 #pragma warning(push)
  73 #pragma warning(disable : 4127)
  74 #endif
  75
  76
  77 template <bool Reverse, typename Box, typename Range>
  78 inline void assign_box_corners_oriented(Box const& box, Range& corners)
  79 {
  80     if (Reverse)
  81     {
  82         // make counterclockwise ll,lr,ur,ul
  83         assign_box_corners(box,
  84                            range::at(corners, 0), range::at(corners, 1),
  85                            range::at(corners, 3), range::at(corners, 2));
  86     }
  87     else
  88     {
  89         // make clockwise ll,ul,ur,lr
  90         assign_box_corners(box,
  91                            range::at(corners, 0), range::at(corners, 3),
  92                            range::at(corners, 1), range::at(corners, 2));
  93     }
  94 }
  95 #if defined(_MSC_VER)
  96 #pragma warning(pop)
  97 #endif
  98
  99
 100 } // namespace detail
 101 #endif // DOXYGEN_NO_DETAIL
 102
 103
 104 }} // namespace boost::geometry
 105
 106
 107 #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_ASSIGN_BOX_CORNERS_HPP