1 // Boost.Geometry (aka GGL, Generic Geometry Library) 2 3 // Copyright (c) 2015-2017, Oracle and/or its affiliates. 4 5 // Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle 6 // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle 7 8 // Licensed under the Boost Software License version 1.0. 9 // http://www.boost.org/users/license.html 10 11 #ifndef BOOST_GEOMETRY_GEOMETRIES_HELPER_GEOMETRY_HPP 12 #define BOOST_GEOMETRY_GEOMETRIES_HELPER_GEOMETRY_HPP 13 14 #include <boost/mpl/assert.hpp> 15 16 #include <boost/geometry/core/cs.hpp> 17 #include <boost/geometry/core/coordinate_dimension.hpp> 18 #include <boost/geometry/core/coordinate_type.hpp> 19 #include <boost/geometry/core/point_type.hpp> 20 #include <boost/geometry/core/tag.hpp> 21 #include <boost/geometry/core/tags.hpp> 22 23 #include <boost/geometry/geometries/box.hpp> 24 #include <boost/geometry/geometries/point.hpp> 25 26 #include <boost/geometry/algorithms/not_implemented.hpp> 27 28 29 namespace boost { namespace geometry 30 { 31 32 namespace detail { namespace helper_geometries 33 { 34 35 template 36 < 37 typename Point, 38 typename NewCoordinateType, 39 typename NewUnits, 40 typename CS_Tag = typename cs_tag<Point>::type 41 > 42 struct helper_point 43 { 44 typedef model::point 45 < 46 NewCoordinateType, 47 dimension<Point>::value, 48 typename cs_tag_to_coordinate_system<NewUnits, CS_Tag>::type 49 > type; 50 }; 51 52 53 }} // detail::helper_geometries 54 55 56 namespace detail_dispatch 57 { 58 59 60 template 61 < 62 typename Geometry, 63 typename NewCoordinateType, 64 typename NewUnits, 65 typename Tag = typename tag<Geometry>::type> 66 struct helper_geometry : not_implemented<Geometry> 67 {}; 68 69 70 template <typename Point, typename NewCoordinateType, typename NewUnits> 71 struct helper_geometry<Point, NewCoordinateType, NewUnits, point_tag> 72 { 73 typedef typename detail::helper_geometries::helper_point 74 < 75 Point, NewCoordinateType, NewUnits 76 >::type type; 77 }; 78 79 80 template <typename Box, typename NewCoordinateType, typename NewUnits> 81 struct helper_geometry<Box, NewCoordinateType, NewUnits, box_tag> 82 { 83 typedef model::box 84 < 85 typename helper_geometry 86 < 87 typename point_type<Box>::type, NewCoordinateType, NewUnits 88 >::type 89 > type; 90 }; 91 92 93 } // detail_dispatch 94 95 96 // Meta-function that provides a new helper geometry of the same kind as 97 // the input geometry and the same coordinate system type, 98 // but with a possibly different coordinate type and coordinate system units 99 template 100 < 101 typename Geometry, 102 typename NewCoordinateType = typename coordinate_type<Geometry>::type, 103 typename NewUnits = typename detail::cs_angular_units<Geometry>::type 104 > 105 struct helper_geometry 106 { 107 typedef typename detail_dispatch::helper_geometry 108 < 109 Geometry, NewCoordinateType, NewUnits 110 >::type type; 111 }; 112 113 114 }} // namespace boost::geometry 115 116 #endif // BOOST_GEOMETRY_GEOMETRIES_HELPER_GEOMETRY_HPP 117