// Boost.Geometry Index
|
//
|
// squared distance between point and centroid of the box or point
|
//
|
// Copyright (c) 2011-2014 Adam Wulkiewicz, Lodz, Poland.
|
//
|
// 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_COMPARABLE_DISTANCE_CENTROID_HPP
|
#define BOOST_GEOMETRY_INDEX_DETAIL_ALGORITHMS_COMPARABLE_DISTANCE_CENTROID_HPP
|
|
#include <boost/geometry/index/detail/algorithms/sum_for_indexable.hpp>
|
#include <boost/geometry/index/detail/algorithms/diff_abs.hpp>
|
|
namespace boost { namespace geometry { namespace index { namespace detail {
|
|
struct comparable_distance_centroid_tag {};
|
|
template <
|
typename Point,
|
typename PointIndexable,
|
size_t N>
|
struct sum_for_indexable<Point, PointIndexable, point_tag, comparable_distance_centroid_tag, N>
|
{
|
typedef typename geometry::default_comparable_distance_result<Point, PointIndexable>::type result_type;
|
|
inline static result_type apply(Point const& pt, PointIndexable const& i)
|
{
|
return geometry::comparable_distance(pt, i);
|
}
|
};
|
|
template <
|
typename Point,
|
typename BoxIndexable,
|
size_t DimensionIndex>
|
struct sum_for_indexable_dimension<Point, BoxIndexable, box_tag, comparable_distance_centroid_tag, DimensionIndex>
|
{
|
typedef typename geometry::default_comparable_distance_result<Point, BoxIndexable>::type result_type;
|
|
inline static result_type apply(Point const& pt, BoxIndexable const& i)
|
{
|
typedef typename coordinate_type<Point>::type point_coord_t;
|
typedef typename coordinate_type<BoxIndexable>::type indexable_coord_t;
|
|
point_coord_t pt_c = geometry::get<DimensionIndex>(pt);
|
indexable_coord_t ind_c_min = geometry::get<geometry::min_corner, DimensionIndex>(i);
|
indexable_coord_t ind_c_max = geometry::get<geometry::max_corner, DimensionIndex>(i);
|
|
indexable_coord_t ind_c_avg = ind_c_min + (ind_c_max - ind_c_min) / 2;
|
// TODO: awulkiew - is (ind_c_min + ind_c_max) / 2 safe?
|
|
result_type diff = detail::diff_abs(ind_c_avg, pt_c);
|
|
return diff * diff;
|
}
|
};
|
|
template <typename Point, typename Indexable>
|
typename geometry::default_comparable_distance_result<Point, Indexable>::type
|
comparable_distance_centroid(Point const& pt, Indexable const& i)
|
{
|
return detail::sum_for_indexable<
|
Point,
|
Indexable,
|
typename tag<Indexable>::type,
|
detail::comparable_distance_centroid_tag,
|
dimension<Indexable>::value
|
>::apply(pt, i);
|
}
|
|
}}}} // namespace boost::geometry::index::detail
|
|
#endif // #define BOOST_GEOMETRY_INDEX_DETAIL_ALGORITHMS_COMPARABLE_DISTANCE_CENTROID_HPP
|
