215 lines
8.0 KiB
C++
215 lines
8.0 KiB
C++
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// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
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// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
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// Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
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// This file was modified by Oracle on 2017-2022.
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// Modifications copyright (c) 2017-2022 Oracle and/or its affiliates.
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// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
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// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
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// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
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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_BUFFER_IMPLEMENTATION_HPP
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#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_BUFFER_IMPLEMENTATION_HPP
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#include <boost/range/value_type.hpp>
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#include <boost/geometry/algorithms/detail/buffer/buffer_box.hpp>
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#include <boost/geometry/algorithms/detail/buffer/buffer_inserter.hpp>
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#include <boost/geometry/algorithms/detail/buffer/interface.hpp>
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#include <boost/geometry/algorithms/detail/visit.hpp> // for GC
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#include <boost/geometry/algorithms/envelope.hpp>
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#include <boost/geometry/algorithms/is_empty.hpp>
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#include <boost/geometry/algorithms/union.hpp> // for GC
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#include <boost/geometry/arithmetic/arithmetic.hpp>
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#include <boost/geometry/geometries/box.hpp>
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#include <boost/geometry/strategies/buffer/cartesian.hpp>
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#include <boost/geometry/strategies/buffer/geographic.hpp>
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#include <boost/geometry/strategies/buffer/spherical.hpp>
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#include <boost/geometry/util/math.hpp>
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#include <boost/geometry/util/range.hpp>
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namespace boost { namespace geometry
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{
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#ifndef DOXYGEN_NO_DISPATCH
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namespace dispatch
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{
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template <typename BoxIn, typename BoxOut>
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struct buffer_dc<BoxIn, BoxOut, box_tag, box_tag>
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{
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template <typename Distance>
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static inline void apply(BoxIn const& box_in, BoxOut& box_out,
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Distance const& distance, Distance const& )
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{
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detail::buffer::buffer_box(box_in, distance, box_out);
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}
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};
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template <typename Input, typename Output, typename TagIn>
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struct buffer_all<Input, Output, TagIn, multi_polygon_tag>
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{
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template
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<
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typename DistanceStrategy,
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typename SideStrategy,
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typename JoinStrategy,
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typename EndStrategy,
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typename PointStrategy,
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typename Strategies
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>
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static inline void apply(Input const& geometry_in,
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Output& geometry_out,
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DistanceStrategy const& distance_strategy,
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SideStrategy const& side_strategy,
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JoinStrategy const& join_strategy,
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EndStrategy const& end_strategy,
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PointStrategy const& point_strategy,
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Strategies const& strategies)
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{
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typedef typename boost::range_value<Output>::type polygon_type;
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typedef typename point_type<Input>::type point_type;
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typedef typename rescale_policy_type
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<
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point_type,
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typename geometry::cs_tag<point_type>::type
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>::type rescale_policy_type;
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if (geometry::is_empty(geometry_in))
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{
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// Then output geometry is kept empty as well
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return;
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}
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model::box<point_type> box;
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geometry::envelope(geometry_in, box);
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geometry::buffer(box, box, distance_strategy.max_distance(join_strategy, end_strategy));
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rescale_policy_type rescale_policy
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= boost::geometry::get_rescale_policy<rescale_policy_type>(
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box, strategies);
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detail::buffer::buffer_inserter<polygon_type>(geometry_in,
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range::back_inserter(geometry_out),
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distance_strategy,
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side_strategy,
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join_strategy,
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end_strategy,
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point_strategy,
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strategies,
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rescale_policy);
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}
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};
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template <typename Input, typename Output>
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struct buffer_all<Input, Output, geometry_collection_tag, multi_polygon_tag>
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{
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template
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<
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typename DistanceStrategy,
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typename SideStrategy,
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typename JoinStrategy,
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typename EndStrategy,
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typename PointStrategy,
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typename Strategies
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>
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static inline void apply(Input const& geometry_in,
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Output& geometry_out,
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DistanceStrategy const& distance_strategy,
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SideStrategy const& side_strategy,
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JoinStrategy const& join_strategy,
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EndStrategy const& end_strategy,
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PointStrategy const& point_strategy,
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Strategies const& strategies)
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{
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// NOTE: The buffer normally calculates everything at once (by pieces) and traverses all
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// of them to apply the union operation. Not even by merging elements. But that is
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// complex and has led to issues as well. Here intermediate results are calculated
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// with buffer and the results are merged afterwards.
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// NOTE: This algorithm merges partial results iteratively.
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// We could first gather all of the results and after that
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// use some more optimal method like merge_elements().
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detail::visit_breadth_first([&](auto const& g)
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{
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Output buffer_result;
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buffer_all
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<
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util::remove_cref_t<decltype(g)>, Output
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>::apply(g, buffer_result, distance_strategy, side_strategy,
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join_strategy, end_strategy, point_strategy, strategies);
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if (! geometry::is_empty(buffer_result))
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{
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Output union_result;
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geometry::union_(geometry_out, buffer_result, union_result, strategies);
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geometry_out = std::move(union_result);
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}
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return true;
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}, geometry_in);
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}
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};
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template <typename Input, typename Output>
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struct buffer_all<Input, Output, geometry_collection_tag, geometry_collection_tag>
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{
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template
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<
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typename DistanceStrategy,
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typename SideStrategy,
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typename JoinStrategy,
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typename EndStrategy,
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typename PointStrategy,
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typename Strategies
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>
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static inline void apply(Input const& geometry_in,
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Output& geometry_out,
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DistanceStrategy const& distance_strategy,
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SideStrategy const& side_strategy,
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JoinStrategy const& join_strategy,
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EndStrategy const& end_strategy,
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PointStrategy const& point_strategy,
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Strategies const& strategies)
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{
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// NOTE: We could also allow returning GC containing only polygons.
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// We'd have to wrap them in model::multi_polygon and then
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// iteratively emplace_back() into the GC.
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using mpo_t = typename util::sequence_find_if
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<
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typename traits::geometry_types<Output>::type,
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util::is_multi_polygon
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>::type;
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mpo_t result;
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buffer_all
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<
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Input, mpo_t
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>::apply(geometry_in, result, distance_strategy, side_strategy,
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join_strategy, end_strategy, point_strategy, strategies);
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range::emplace_back(geometry_out, std::move(result));
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}
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};
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template <typename Input, typename Output, typename TagIn>
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struct buffer_all<Input, Output, TagIn, geometry_collection_tag>
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: buffer_all<Input, Output, geometry_collection_tag, geometry_collection_tag>
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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_BUFFER_IMPLEMENTATION_HPP
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