433 lines
12 KiB
C++
433 lines
12 KiB
C++
// Boost.Geometry
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// Copyright (c) 2017-2018, Oracle and/or its affiliates.
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// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
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// Licensed under the Boost Software License version 1.0.
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// http://www.boost.org/users/license.html
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#ifndef BOOST_GEOMETRY_ALGORITHMS_DENSIFY_HPP
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#define BOOST_GEOMETRY_ALGORITHMS_DENSIFY_HPP
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#include <boost/geometry/algorithms/clear.hpp>
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#include <boost/geometry/algorithms/detail/convert_point_to_point.hpp>
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#include <boost/geometry/algorithms/not_implemented.hpp>
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#include <boost/geometry/core/closure.hpp>
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#include <boost/geometry/core/cs.hpp>
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#include <boost/geometry/core/exception.hpp>
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#include <boost/geometry/core/point_type.hpp>
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#include <boost/geometry/core/tag.hpp>
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#include <boost/geometry/core/tags.hpp>
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#include <boost/geometry/strategies/default_strategy.hpp>
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#include <boost/geometry/strategies/densify.hpp>
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#include <boost/geometry/util/condition.hpp>
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#include <boost/geometry/util/range.hpp>
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#include <boost/range/size.hpp>
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#include <boost/range/value_type.hpp>
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#include <boost/throw_exception.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 densify
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{
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template <typename Range>
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struct push_back_policy
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{
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typedef typename boost::range_value<Range>::type point_type;
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inline explicit push_back_policy(Range & rng)
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: m_rng(rng)
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{}
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inline void apply(point_type const& p)
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{
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range::push_back(m_rng, p);
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}
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private:
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Range & m_rng;
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};
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template <typename Range, typename Point>
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inline void convert_and_push_back(Range & range, Point const& p)
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{
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typename boost::range_value<Range>::type p2;
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geometry::detail::conversion::convert_point_to_point(p, p2);
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range::push_back(range, p2);
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}
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template <bool AppendLastPoint = true>
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struct densify_range
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{
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template <typename FwdRng, typename MutRng, typename T, typename Strategy>
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static inline void apply(FwdRng const& rng, MutRng & rng_out,
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T const& len, Strategy const& strategy)
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{
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typedef typename boost::range_iterator<FwdRng const>::type iterator_t;
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typedef typename boost::range_value<FwdRng>::type point_t;
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iterator_t it = boost::begin(rng);
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iterator_t end = boost::end(rng);
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if (it == end) // empty(rng)
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{
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return;
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}
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push_back_policy<MutRng> policy(rng_out);
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iterator_t prev = it;
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for ( ++it ; it != end ; prev = it++)
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{
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point_t const& p0 = *prev;
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point_t const& p1 = *it;
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convert_and_push_back(rng_out, p0);
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strategy.apply(p0, p1, policy, len);
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}
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if (BOOST_GEOMETRY_CONDITION(AppendLastPoint))
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{
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convert_and_push_back(rng_out, *prev); // back(rng)
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}
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}
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};
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template <bool IsClosed1, bool IsClosed2> // false, X
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struct densify_ring
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{
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template <typename Geometry, typename GeometryOut, typename T, typename Strategy>
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static inline void apply(Geometry const& ring, GeometryOut & ring_out,
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T const& len, Strategy const& strategy)
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{
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geometry::detail::densify::densify_range<true>
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::apply(ring, ring_out, len, strategy);
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if (boost::size(ring) <= 1)
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return;
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typedef typename point_type<Geometry>::type point_t;
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point_t const& p0 = range::back(ring);
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point_t const& p1 = range::front(ring);
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push_back_policy<GeometryOut> policy(ring_out);
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strategy.apply(p0, p1, policy, len);
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if (BOOST_GEOMETRY_CONDITION(IsClosed2))
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{
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convert_and_push_back(ring_out, p1);
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}
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}
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};
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template <>
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struct densify_ring<true, true>
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: densify_range<true>
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{};
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template <>
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struct densify_ring<true, false>
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: densify_range<false>
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{};
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}} // namespace detail::densify
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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
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<
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typename Geometry,
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typename GeometryOut,
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typename Tag1 = typename tag<Geometry>::type,
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typename Tag2 = typename tag<GeometryOut>::type
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>
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struct densify
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: not_implemented<Tag1, Tag2>
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{};
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template <typename Geometry, typename GeometryOut>
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struct densify<Geometry, GeometryOut, linestring_tag, linestring_tag>
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: geometry::detail::densify::densify_range<>
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{};
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template <typename Geometry, typename GeometryOut>
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struct densify<Geometry, GeometryOut, multi_linestring_tag, multi_linestring_tag>
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{
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template <typename T, typename Strategy>
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static void apply(Geometry const& mls, GeometryOut & mls_out,
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T const& len, Strategy const& strategy)
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{
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std::size_t count = boost::size(mls);
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range::resize(mls_out, count);
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for (std::size_t i = 0 ; i < count ; ++i)
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{
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geometry::detail::densify::densify_range<>
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::apply(range::at(mls, i), range::at(mls_out, i),
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len, strategy);
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}
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}
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};
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template <typename Geometry, typename GeometryOut>
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struct densify<Geometry, GeometryOut, ring_tag, ring_tag>
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: geometry::detail::densify::densify_ring
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<
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geometry::closure<Geometry>::value != geometry::open,
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geometry::closure<GeometryOut>::value != geometry::open
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>
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{};
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template <typename Geometry, typename GeometryOut>
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struct densify<Geometry, GeometryOut, polygon_tag, polygon_tag>
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{
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template <typename T, typename Strategy>
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static void apply(Geometry const& poly, GeometryOut & poly_out,
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T const& len, Strategy const& strategy)
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{
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apply_ring(exterior_ring(poly), exterior_ring(poly_out),
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len, strategy);
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std::size_t count = boost::size(interior_rings(poly));
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range::resize(interior_rings(poly_out), count);
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for (std::size_t i = 0 ; i < count ; ++i)
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{
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apply_ring(range::at(interior_rings(poly), i),
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range::at(interior_rings(poly_out), i),
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len, strategy);
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}
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}
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template <typename Ring, typename RingOut, typename T, typename Strategy>
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static void apply_ring(Ring const& ring, RingOut & ring_out,
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T const& len, Strategy const& strategy)
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{
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densify<Ring, RingOut, ring_tag, ring_tag>
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::apply(ring, ring_out, len, strategy);
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}
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};
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template <typename Geometry, typename GeometryOut>
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struct densify<Geometry, GeometryOut, multi_polygon_tag, multi_polygon_tag>
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{
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template <typename T, typename Strategy>
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static void apply(Geometry const& mpoly, GeometryOut & mpoly_out,
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T const& len, Strategy const& strategy)
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{
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std::size_t count = boost::size(mpoly);
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range::resize(mpoly_out, count);
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for (std::size_t i = 0 ; i < count ; ++i)
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{
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apply_poly(range::at(mpoly, i),
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range::at(mpoly_out, i),
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len, strategy);
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}
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}
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template <typename Poly, typename PolyOut, typename T, typename Strategy>
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static void apply_poly(Poly const& poly, PolyOut & poly_out,
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T const& len, Strategy const& strategy)
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{
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densify<Poly, PolyOut, polygon_tag, polygon_tag>::
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apply(poly, poly_out, len, strategy);
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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 resolve_strategy
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{
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struct densify
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{
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template <typename Geometry, typename Distance, typename Strategy>
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static inline void apply(Geometry const& geometry,
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Geometry& out,
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Distance const& max_distance,
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Strategy const& strategy)
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{
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dispatch::densify<Geometry, Geometry>
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::apply(geometry, out, max_distance, strategy);
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}
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template <typename Geometry, typename Distance>
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static inline void apply(Geometry const& geometry,
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Geometry& out,
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Distance const& max_distance,
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default_strategy)
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{
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typedef typename strategy::densify::services::default_strategy
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<
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typename cs_tag<Geometry>::type
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>::type strategy_type;
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/*BOOST_CONCEPT_ASSERT(
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(concepts::DensifyStrategy<strategy_type>)
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);*/
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apply(geometry, out, max_distance, strategy_type());
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}
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};
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} // namespace resolve_strategy
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namespace resolve_variant {
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template <typename Geometry>
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struct densify
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{
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template <typename Distance, typename Strategy>
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static inline void apply(Geometry const& geometry,
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Geometry& out,
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Distance const& max_distance,
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Strategy const& strategy)
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{
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resolve_strategy::densify::apply(geometry, out, max_distance, strategy);
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}
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};
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template <BOOST_VARIANT_ENUM_PARAMS(typename T)>
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struct densify<boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> >
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{
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template <typename Distance, typename Strategy>
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struct visitor: boost::static_visitor<void>
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{
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Distance const& m_max_distance;
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Strategy const& m_strategy;
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visitor(Distance const& max_distance, Strategy const& strategy)
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: m_max_distance(max_distance)
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, m_strategy(strategy)
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{}
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template <typename Geometry>
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void operator()(Geometry const& geometry, Geometry& out) const
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{
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densify<Geometry>::apply(geometry, out, m_max_distance, m_strategy);
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}
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};
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template <typename Distance, typename Strategy>
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static inline void
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apply(boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> const& geometry,
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boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>& out,
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Distance const& max_distance,
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Strategy const& strategy)
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{
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boost::apply_visitor(
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visitor<Distance, Strategy>(max_distance, strategy),
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geometry,
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out
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);
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}
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};
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} // namespace resolve_variant
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/*!
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\brief Densify a geometry using a specified strategy
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\ingroup densify
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\tparam Geometry \tparam_geometry
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\tparam Distance A numerical distance measure
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\tparam Strategy A type fulfilling a DensifyStrategy concept
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\param geometry Input geometry, to be densified
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\param out Output geometry, densified version of the input geometry
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\param max_distance Distance threshold (in units depending on strategy)
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\param strategy Densify strategy to be used for densification
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\qbk{distinguish,with strategy}
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\qbk{[include reference/algorithms/densify.qbk]}
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\qbk{
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[heading Available Strategies]
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\* [link geometry.reference.strategies.strategy_densify_cartesian Cartesian]
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\* [link geometry.reference.strategies.strategy_densify_spherical Spherical]
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\* [link geometry.reference.strategies.strategy_densify_geographic Geographic]
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[heading Example]
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[densify_strategy]
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[densify_strategy_output]
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[heading See also]
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\* [link geometry.reference.algorithms.line_interpolate line_interpolate]
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}
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*/
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template <typename Geometry, typename Distance, typename Strategy>
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inline void densify(Geometry const& geometry,
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Geometry& out,
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Distance const& max_distance,
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Strategy const& strategy)
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{
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concepts::check<Geometry>();
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if (max_distance <= Distance(0))
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{
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BOOST_THROW_EXCEPTION(geometry::invalid_input_exception());
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}
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geometry::clear(out);
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resolve_variant::densify
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<
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Geometry
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>::apply(geometry, out, max_distance, strategy);
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}
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/*!
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\brief Densify a geometry
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\ingroup densify
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\tparam Geometry \tparam_geometry
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\tparam Distance A numerical distance measure
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\param geometry Input geometry, to be densified
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\param out Output geometry, densified version of the input geometry
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\param max_distance Distance threshold (in units depending on coordinate system)
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\qbk{[include reference/algorithms/densify.qbk]}
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\qbk{
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[heading Example]
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[densify]
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[densify_output]
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[heading See also]
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\* [link geometry.reference.algorithms.line_interpolate line_interpolate]
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}
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*/
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template <typename Geometry, typename Distance>
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inline void densify(Geometry const& geometry,
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Geometry& out,
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Distance const& max_distance)
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{
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densify(geometry, out, max_distance, default_strategy());
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}
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_ALGORITHMS_DENSIFY_HPP
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