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7dcba58943
... instead of using the default one created internally. It affects buffer, is_simple, is_valid, is_convex, point_on_surface, remove spikes and various overlay algorithms.
324 lines
9.0 KiB
C++
324 lines
9.0 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2007-2013 Barend Gehrels, Amsterdam, the Netherlands.
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// Copyright (c) 2008-2013 Bruno Lalande, Paris, France.
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// Copyright (c) 2009-2013 Mateusz Loskot, London, UK.
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// Copyright (c) 2013-2014 Adam Wulkiewicz, Lodz, Poland.
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// This file was modified by Oracle on 2017.
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// Modifications copyright (c) 2017 Oracle and/or its affiliates.
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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_REMOVE_SPIKES_HPP
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#define BOOST_GEOMETRY_ALGORITHMS_REMOVE_SPIKES_HPP
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#include <deque>
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#include <boost/range.hpp>
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#include <boost/type_traits/remove_reference.hpp>
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#include <boost/variant/apply_visitor.hpp>
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#include <boost/variant/static_visitor.hpp>
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#include <boost/variant/variant_fwd.hpp>
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#include <boost/geometry/core/closure.hpp>
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#include <boost/geometry/core/coordinate_type.hpp>
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#include <boost/geometry/core/cs.hpp>
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#include <boost/geometry/core/interior_rings.hpp>
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#include <boost/geometry/core/point_order.hpp>
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#include <boost/geometry/core/tags.hpp>
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#include <boost/geometry/geometries/concepts/check.hpp>
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#include <boost/geometry/algorithms/detail/point_is_spike_or_equal.hpp>
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#include <boost/geometry/algorithms/detail/interior_iterator.hpp>
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#include <boost/geometry/algorithms/clear.hpp>
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#include <boost/geometry/strategies/default_strategy.hpp>
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#include <boost/geometry/util/condition.hpp>
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/*
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Remove spikes from a ring/polygon.
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Ring (having 8 vertices, including closing vertex)
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+------+
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| +--+
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| | ^this "spike" is removed, can be located outside/inside the ring
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+------+
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(the actualy determination if it is removed is done by a strategy)
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*/
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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 remove_spikes
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{
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struct range_remove_spikes
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{
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template <typename Range, typename SideStrategy>
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static inline void apply(Range& range, SideStrategy const& strategy)
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{
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typedef typename point_type<Range>::type point_type;
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std::size_t n = boost::size(range);
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std::size_t const min_num_points = core_detail::closure::minimum_ring_size
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<
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geometry::closure<Range>::value
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>::value - 1; // subtract one: a polygon with only one spike should result into one point
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if (n < min_num_points)
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{
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return;
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}
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std::deque<point_type> cleaned;
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for (typename boost::range_iterator<Range const>::type it = boost::begin(range);
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it != boost::end(range); ++it)
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{
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// Add point
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cleaned.push_back(*it);
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while(cleaned.size() >= 3
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&& detail::point_is_spike_or_equal(cleaned.back(),
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*(cleaned.end() - 3),
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*(cleaned.end() - 2),
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strategy))
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{
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// Remove pen-ultimate point causing the spike (or which was equal)
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cleaned.erase(cleaned.end() - 2);
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}
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}
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// For a closed-polygon, remove closing point, this makes checking first point(s) easier and consistent
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if ( BOOST_GEOMETRY_CONDITION(geometry::closure<Range>::value == geometry::closed) )
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{
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cleaned.pop_back();
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}
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bool found = false;
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do
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{
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found = false;
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// Check for spike in first point
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int const penultimate = 2;
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while(cleaned.size() >= 3
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&& detail::point_is_spike_or_equal(cleaned.front(),
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*(cleaned.end() - penultimate),
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cleaned.back(),
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strategy))
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{
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cleaned.pop_back();
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found = true;
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}
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// Check for spike in second point
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while(cleaned.size() >= 3
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&& detail::point_is_spike_or_equal(*(cleaned.begin() + 1),
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cleaned.back(),
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cleaned.front(),
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strategy))
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{
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cleaned.pop_front();
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found = true;
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}
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}
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while (found);
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if (cleaned.size() == 2)
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{
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// Ticket #9871: open polygon with only two points.
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// the second point forms, by definition, a spike
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cleaned.pop_back();
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}
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// Close if necessary
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if ( BOOST_GEOMETRY_CONDITION(geometry::closure<Range>::value == geometry::closed) )
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{
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cleaned.push_back(cleaned.front());
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}
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// Copy output
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geometry::clear(range);
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std::copy(cleaned.begin(), cleaned.end(), range::back_inserter(range));
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}
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};
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struct polygon_remove_spikes
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{
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template <typename Polygon, typename SideStrategy>
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static inline void apply(Polygon& polygon, SideStrategy const& strategy)
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{
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typedef range_remove_spikes per_range;
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per_range::apply(exterior_ring(polygon), strategy);
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typename interior_return_type<Polygon>::type
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rings = interior_rings(polygon);
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for (typename detail::interior_iterator<Polygon>::type
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it = boost::begin(rings); it != boost::end(rings); ++it)
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{
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per_range::apply(*it, strategy);
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}
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}
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};
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template <typename SingleVersion>
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struct multi_remove_spikes
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{
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template <typename MultiGeometry, typename SideStrategy>
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static inline void apply(MultiGeometry& multi, SideStrategy const& strategy)
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{
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for (typename boost::range_iterator<MultiGeometry>::type
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it = boost::begin(multi);
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it != boost::end(multi);
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++it)
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{
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SingleVersion::apply(*it, strategy);
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}
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}
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};
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}} // namespace detail::remove_spikes
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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 Tag = typename tag<Geometry>::type
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>
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struct remove_spikes
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{
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template <typename SideStrategy>
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static inline void apply(Geometry&, SideStrategy const&)
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{}
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};
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template <typename Ring>
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struct remove_spikes<Ring, ring_tag>
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: detail::remove_spikes::range_remove_spikes
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{};
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template <typename Polygon>
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struct remove_spikes<Polygon, polygon_tag>
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: detail::remove_spikes::polygon_remove_spikes
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{};
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template <typename MultiPolygon>
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struct remove_spikes<MultiPolygon, multi_polygon_tag>
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: detail::remove_spikes::multi_remove_spikes
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<
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detail::remove_spikes::polygon_remove_spikes
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>
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{};
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} // namespace dispatch
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#endif
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namespace resolve_variant {
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template <typename Geometry>
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struct remove_spikes
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{
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template <typename Strategy>
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static void apply(Geometry& geometry, Strategy const& strategy)
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{
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concepts::check<Geometry>();
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dispatch::remove_spikes<Geometry>::apply(geometry, strategy);
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}
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static void apply(Geometry& geometry, geometry::default_strategy const&)
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{
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typedef typename strategy::side::services::default_strategy
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<
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typename cs_tag<Geometry>::type
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>::type side_strategy;
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apply(geometry, side_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 remove_spikes<boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> >
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{
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template <typename Strategy>
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struct visitor: boost::static_visitor<void>
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{
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Strategy const& m_strategy;
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visitor(Strategy const& strategy) : m_strategy(strategy) {}
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template <typename Geometry>
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void operator()(Geometry& geometry) const
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{
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remove_spikes<Geometry>::apply(geometry, m_strategy);
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}
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};
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template <typename Strategy>
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static inline void apply(boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>& geometry,
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Strategy const& strategy)
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{
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boost::apply_visitor(visitor<Strategy>(strategy), geometry);
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}
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};
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} // namespace resolve_variant
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/*!
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\ingroup remove_spikes
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\tparam Geometry geometry type
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\param geometry the geometry to make remove_spikes
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*/
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template <typename Geometry>
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inline void remove_spikes(Geometry& geometry)
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{
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resolve_variant::remove_spikes<Geometry>::apply(geometry, geometry::default_strategy());
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}
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/*!
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\ingroup remove_spikes
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\tparam Geometry geometry type
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\tparam Strategy side strategy type
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\param geometry the geometry to make remove_spikes
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\param strategy the side strategy used by the algorithm
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*/
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template <typename Geometry, typename Strategy>
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inline void remove_spikes(Geometry& geometry, Strategy const& strategy)
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{
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resolve_variant::remove_spikes<Geometry>::apply(geometry, strategy);
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}
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_ALGORITHMS_REMOVE_SPIKES_HPP
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