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91 lines
2.3 KiB
C++
91 lines
2.3 KiB
C++
2 years ago
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// Boost.Geometry
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// Copyright (c) 2018 Oracle and/or its affiliates.
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// Contributed and/or modified by Vissarion Fysikopoulos, on behalf of Oracle
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// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_ENVELOPE_AREAL_HPP
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#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_ENVELOPE_AREAL_HPP
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#include <boost/geometry/core/cs.hpp>
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#include <boost/geometry/core/tags.hpp>
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#include <boost/geometry/iterators/segment_iterator.hpp>
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#include <boost/geometry/algorithms/detail/envelope/range.hpp>
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#include <boost/geometry/algorithms/detail/envelope/linear.hpp>
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#include <boost/geometry/algorithms/dispatch/envelope.hpp>
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namespace boost { namespace geometry
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{
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#ifndef DOXYGEN_NO_DETAIL
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namespace detail { namespace envelope
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{
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struct envelope_polygon
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{
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template <typename Polygon, typename Box, typename Strategy>
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static inline void apply(Polygon const& polygon, Box& mbr, Strategy const& strategy)
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{
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typename ring_return_type<Polygon const>::type ext_ring
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= exterior_ring(polygon);
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if (geometry::is_empty(ext_ring))
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{
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// if the exterior ring is empty, consider the interior rings
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envelope_multi_range
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<
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envelope_range
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>::apply(interior_rings(polygon), mbr, strategy);
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}
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else
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{
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// otherwise, consider only the exterior ring
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envelope_range::apply(ext_ring, mbr, strategy);
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}
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}
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};
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}} // namespace detail::envelope
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#endif // DOXYGEN_NO_DETAIL
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#ifndef DOXYGEN_NO_DISPATCH
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namespace dispatch
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{
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template <typename Ring>
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struct envelope<Ring, ring_tag>
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: detail::envelope::envelope_range
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{};
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template <typename Polygon>
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struct envelope<Polygon, polygon_tag>
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: detail::envelope::envelope_polygon
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{};
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template <typename MultiPolygon>
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struct envelope<MultiPolygon, multi_polygon_tag>
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: detail::envelope::envelope_multi_range
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<
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detail::envelope::envelope_polygon
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>
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{};
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} // namespace dispatch
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#endif // DOXYGEN_NO_DISPATCH
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_ENVELOPE_AREAL_HPP
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