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+// Boost.Geometry (aka GGL, Generic Geometry Library)
+
+// Copyright (c) 2007-2015 Barend Gehrels, Amsterdam, the Netherlands.
+// Copyright (c) 2008-2015 Bruno Lalande, Paris, France.
+// Copyright (c) 2009-2015 Mateusz Loskot, London, UK.
+
+// This file was modified by Oracle on 2015.
+// Modifications copyright (c) 2015, Oracle and/or its affiliates.
+
+// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
+
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_ENVELOPE_BOX_HPP
+#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_ENVELOPE_BOX_HPP
+
+#include <cstddef>
+
+#include <boost/geometry/core/cs.hpp>
+#include <boost/geometry/core/coordinate_dimension.hpp>
+#include <boost/geometry/core/coordinate_system.hpp>
+#include <boost/geometry/core/tags.hpp>
+
+#include <boost/geometry/views/detail/indexed_point_view.hpp>
+
+#include <boost/geometry/algorithms/detail/convert_point_to_point.hpp>
+#include <boost/geometry/algorithms/detail/normalize.hpp>
+#include <boost/geometry/algorithms/detail/envelope/transform_units.hpp>
+
+#include <boost/geometry/algorithms/dispatch/envelope.hpp>
+
+
+namespace boost { namespace geometry
+{
+
+#ifndef DOXYGEN_NO_DETAIL
+namespace detail { namespace envelope
+{
+
+
+template
+<
+ std::size_t Index,
+ std::size_t Dimension,
+ std::size_t DimensionCount
+>
+struct envelope_indexed_box
+{
+ template <typename BoxIn, typename BoxOut>
+ static inline void apply(BoxIn const& box_in, BoxOut& mbr)
+ {
+ detail::indexed_point_view<BoxIn const, Index> box_in_corner(box_in);
+ detail::indexed_point_view<BoxOut, Index> mbr_corner(mbr);
+
+ detail::conversion::point_to_point
+ <
+ detail::indexed_point_view<BoxIn const, Index>,
+ detail::indexed_point_view<BoxOut, Index>,
+ Dimension,
+ DimensionCount
+ >::apply(box_in_corner, mbr_corner);
+ }
+};
+
+template
+<
+ std::size_t Index,
+ std::size_t DimensionCount
+>
+struct envelope_indexed_box_on_spheroid
+{
+ template <typename BoxIn, typename BoxOut>
+ static inline void apply(BoxIn const& box_in, BoxOut& mbr)
+ {
+ // transform() does not work with boxes of dimension higher
+ // than 2; to account for such boxes we transform the min/max
+ // points of the boxes using the indexed_point_view
+ detail::indexed_point_view<BoxIn const, Index> box_in_corner(box_in);
+ detail::indexed_point_view<BoxOut, Index> mbr_corner(mbr);
+
+ // first transform the units
+ transform_units(box_in_corner, mbr_corner);
+
+ // now transform the remaining coordinates
+ detail::conversion::point_to_point
+ <
+ detail::indexed_point_view<BoxIn const, Index>,
+ detail::indexed_point_view<BoxOut, Index>,
+ 2,
+ DimensionCount
+ >::apply(box_in_corner, mbr_corner);
+ }
+};
+
+
+struct envelope_box
+{
+ template<typename BoxIn, typename BoxOut>
+ static inline void apply(BoxIn const& box_in, BoxOut& mbr)
+ {
+ envelope_indexed_box
+ <
+ min_corner, 0, dimension<BoxIn>::value
+ >::apply(box_in, mbr);
+
+ envelope_indexed_box
+ <
+ max_corner, 0, dimension<BoxIn>::value
+ >::apply(box_in, mbr);
+ }
+};
+
+
+struct envelope_box_on_spheroid
+{
+ template <typename BoxIn, typename BoxOut>
+ static inline void apply(BoxIn const& box_in, BoxOut& mbr)
+ {
+ BoxIn box_in_normalized = detail::return_normalized<BoxIn>(box_in);
+
+ envelope_indexed_box_on_spheroid
+ <
+ min_corner, dimension<BoxIn>::value
+ >::apply(box_in_normalized, mbr);
+
+ envelope_indexed_box_on_spheroid
+ <
+ max_corner, dimension<BoxIn>::value
+ >::apply(box_in_normalized, mbr);
+ }
+};
+
+
+}} // namespace detail::envelope
+#endif // DOXYGEN_NO_DETAIL
+
+#ifndef DOXYGEN_NO_DISPATCH
+namespace dispatch
+{
+
+
+template <typename Box, typename CS_Tag>
+struct envelope<Box, box_tag, CS_Tag>
+ : detail::envelope::envelope_box
+{};
+
+
+template <typename Box>
+struct envelope<Box, box_tag, spherical_equatorial_tag>
+ : detail::envelope::envelope_box_on_spheroid
+{};
+
+
+template <typename Box>
+struct envelope<Box, box_tag, geographic_tag>
+ : detail::envelope::envelope_box_on_spheroid
+{};
+
+
+} // namespace dispatch
+#endif // DOXYGEN_NO_DISPATCH
+
+}} // namespace boost::geometry
+
+#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_ENVELOPE_BOX_HPP