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// Boost.Geometry Index
//
// n-dimensional box's margin value (hypersurface), 2d perimeter, 3d surface, etc...
//
// Copyright (c) 2011-2014 Adam Wulkiewicz, Lodz, Poland.
//
// This file was modified by Oracle on 2020.
// Modifications copyright (c) 2020 Oracle and/or its affiliates.
// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
//
// Use, modification and distribution is subject to 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_INDEX_DETAIL_ALGORITHMS_MARGIN_HPP
#define BOOST_GEOMETRY_INDEX_DETAIL_ALGORITHMS_MARGIN_HPP
#include <boost/geometry/core/static_assert.hpp>
// WARNING! comparable_margin() will work only if the same Geometries are compared
// so it shouldn't be used in the case of Variants!
namespace boost { namespace geometry { namespace index { namespace detail {
template <typename Box>
struct default_margin_result
{
typedef typename select_most_precise<
typename coordinate_type<Box>::type,
long double
>::type type;
};
//template <typename Box,
// std::size_t CurrentDimension,
// std::size_t EdgeDimension = dimension<Box>::value>
//struct margin_for_each_edge
//{
// BOOST_STATIC_ASSERT(0 < CurrentDimension);
// BOOST_STATIC_ASSERT(0 < EdgeDimension);
//
// static inline typename default_margin_result<Box>::type apply(Box const& b)
// {
// return margin_for_each_edge<Box, CurrentDimension, EdgeDimension - 1>::apply(b) *
// ( geometry::get<max_corner, EdgeDimension - 1>(b) - geometry::get<min_corner, EdgeDimension - 1>(b) );
// }
//};
//
//template <typename Box, std::size_t CurrentDimension>
//struct margin_for_each_edge<Box, CurrentDimension, CurrentDimension>
//{
// BOOST_STATIC_ASSERT(0 < CurrentDimension);
//
// static inline typename default_margin_result<Box>::type apply(Box const& b)
// {
// return margin_for_each_edge<Box, CurrentDimension, CurrentDimension - 1>::apply(b);
// }
//};
//
//template <typename Box, std::size_t CurrentDimension>
//struct margin_for_each_edge<Box, CurrentDimension, 1>
//{
// BOOST_STATIC_ASSERT(0 < CurrentDimension);
//
// static inline typename default_margin_result<Box>::type apply(Box const& b)
// {
// return geometry::get<max_corner, 0>(b) - geometry::get<min_corner, 0>(b);
// }
//};
//
//template <typename Box>
//struct margin_for_each_edge<Box, 1, 1>
//{
// static inline typename default_margin_result<Box>::type apply(Box const& /*b*/)
// {
// return 1;
// }
//};
//
//template <typename Box,
// std::size_t CurrentDimension = dimension<Box>::value>
//struct margin_for_each_dimension
//{
// BOOST_STATIC_ASSERT(0 < CurrentDimension);
//
// static inline typename default_margin_result<Box>::type apply(Box const& b)
// {
// return margin_for_each_dimension<Box, CurrentDimension - 1>::apply(b) +
// margin_for_each_edge<Box, CurrentDimension>::apply(b);
// }
//};
//
//template <typename Box>
//struct margin_for_each_dimension<Box, 1>
//{
// static inline typename default_margin_result<Box>::type apply(Box const& b)
// {
// return margin_for_each_edge<Box, 1>::apply(b);
// }
//};
// TODO - test if this definition of margin is ok for Dimension > 2
// Now it's sum of edges lengths
// maybe margin_for_each_dimension should be used to get more or less hypersurface?
template <typename Box,
std::size_t CurrentDimension = dimension<Box>::value>
struct simple_margin_for_each_dimension
{
BOOST_STATIC_ASSERT(0 < CurrentDimension);
static inline typename default_margin_result<Box>::type apply(Box const& b)
{
return simple_margin_for_each_dimension<Box, CurrentDimension - 1>::apply(b) +
geometry::get<max_corner, CurrentDimension - 1>(b) - geometry::get<min_corner, CurrentDimension - 1>(b);
}
};
template <typename Box>
struct simple_margin_for_each_dimension<Box, 1>
{
static inline typename default_margin_result<Box>::type apply(Box const& b)
{
return geometry::get<max_corner, 0>(b) - geometry::get<min_corner, 0>(b);
}
};
namespace dispatch {
template <typename Geometry, typename Tag>
struct comparable_margin
{
BOOST_GEOMETRY_STATIC_ASSERT_FALSE(
"Not implemented for this Geometry type.",
Geometry, Tag);
};
template <typename Geometry>
struct comparable_margin<Geometry, point_tag>
{
typedef typename default_margin_result<Geometry>::type result_type;
static inline result_type apply(Geometry const& ) { return 0; }
};
template <typename Box>
struct comparable_margin<Box, box_tag>
{
typedef typename default_margin_result<Box>::type result_type;
static inline result_type apply(Box const& g)
{
//return detail::margin_for_each_dimension<Box>::apply(g);
return detail::simple_margin_for_each_dimension<Box>::apply(g);
}
};
} // namespace dispatch
template <typename Geometry>
typename default_margin_result<Geometry>::type comparable_margin(Geometry const& g)
{
return dispatch::comparable_margin<
Geometry,
typename tag<Geometry>::type
>::apply(g);
}
//template <typename Box>
//typename default_margin_result<Box>::type margin(Box const& b)
//{
// return 2 * detail::margin_for_each_dimension<Box>::apply(b);
//}
}}}} // namespace boost::geometry::index::detail
#endif // BOOST_GEOMETRY_INDEX_DETAIL_ALGORITHMS_MARGIN_HPP
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