Added thirdparty: boost library

thirdparty/include/boost/geometry/algorithms/remove_spikes.hpp

@@ -0,0 +1,326 @@
+// Boost.Geometry (aka GGL, Generic Geometry Library)
+
+// Copyright (c) 2007-2013 Barend Gehrels, Amsterdam, the Netherlands.
+// Copyright (c) 2008-2013 Bruno Lalande, Paris, France.
+// Copyright (c) 2009-2013 Mateusz Loskot, London, UK.
+// Copyright (c) 2013-2014 Adam Wulkiewicz, Lodz, Poland.
+
+// This file was modified by Oracle on 2017-2023.
+// Modifications copyright (c) 2017-2023 Oracle and/or its affiliates.
+// Contributed and/or modified by Vissarion Fysikopoulos, on behalf of Oracle
+// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
+
+// 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_ALGORITHMS_REMOVE_SPIKES_HPP
+#define BOOST_GEOMETRY_ALGORITHMS_REMOVE_SPIKES_HPP
+
+#include <boost/range/begin.hpp>
+#include <boost/range/end.hpp>
+#include <boost/range/size.hpp>
+
+#include <boost/variant/apply_visitor.hpp>
+#include <boost/variant/static_visitor.hpp>
+#include <boost/variant/variant_fwd.hpp>
+
+#include <boost/geometry/core/closure.hpp>
+#include <boost/geometry/core/cs.hpp>
+#include <boost/geometry/core/interior_rings.hpp>
+#include <boost/geometry/core/tags.hpp>
+
+#include <boost/geometry/geometries/concepts/check.hpp>
+
+#include <boost/geometry/algorithms/detail/point_is_spike_or_equal.hpp>
+#include <boost/geometry/algorithms/clear.hpp>
+
+#include <boost/geometry/strategies/default_strategy.hpp>
+
+#include <boost/geometry/util/condition.hpp>
+#include <boost/geometry/util/range.hpp>
+
+
+/*
+Remove spikes from a ring/polygon.
+Ring (having 8 vertices, including closing vertex)
++------+
+|      |
+|      +--+
+|      |  ^this "spike" is removed, can be located outside/inside the ring
++------+
+(the actualy determination if it is removed is done by a strategy)
+
+*/
+
+
+namespace boost { namespace geometry
+{
+
+
+#ifndef DOXYGEN_NO_DETAIL
+namespace detail { namespace remove_spikes
+{
+
+
+struct range_remove_spikes
+{
+    template <typename Range, typename SideStrategy>
+    static inline void apply(Range& range, SideStrategy const& strategy)
+    {
+        typedef typename point_type<Range>::type point_type;
+
+        std::size_t n = boost::size(range);
+        std::size_t const min_num_points = core_detail::closure::minimum_ring_size
+            <
+                geometry::closure<Range>::value
+            >::value - 1; // subtract one: a polygon with only one spike should result into one point
+        if (n < min_num_points)
+        {
+            return;
+        }
+
+        std::vector<point_type> cleaned;
+        cleaned.reserve(n);
+
+        for (auto const& p : range)
+        {
+            // Add point
+            cleaned.push_back(p);
+
+            while(cleaned.size() >= 3
+                  && detail::is_spike_or_equal(range::at(cleaned, cleaned.size() - 3),
+                                               range::at(cleaned, cleaned.size() - 2),
+                                               range::back(cleaned),
+                                               strategy))
+            {
+                // Remove pen-ultimate point causing the spike (or which was equal)
+                cleaned.erase(cleaned.end() - 2);
+            }
+        }
+
+        auto cleaned_b = cleaned.begin();
+        auto cleaned_e = cleaned.end();
+        std::size_t cleaned_count = cleaned.size();
+
+        // For a closed-polygon, remove closing point, this makes checking first point(s) easier and consistent
+        if ( BOOST_GEOMETRY_CONDITION(geometry::closure<Range>::value == geometry::closed) )
+        {
+            --cleaned_e;
+            --cleaned_count;
+        }
+
+        bool found = false;
+        do
+        {
+            found = false;
+            // Check for spike in first point
+            while(cleaned_count >= 3
+                  && detail::is_spike_or_equal(*(cleaned_e - 2), // prev
+                                               *(cleaned_e - 1), // back
+                                               *(cleaned_b),     // front
+                                               strategy))
+            {
+                --cleaned_e;
+                --cleaned_count;
+                found = true;
+            }
+            // Check for spike in second point
+            while(cleaned_count >= 3
+                  && detail::is_spike_or_equal(*(cleaned_e - 1), // back
+                                               *(cleaned_b),     // front
+                                               *(cleaned_b + 1), // next
+                                               strategy))
+            {
+                ++cleaned_b;
+                --cleaned_count;
+                found = true;
+            }
+        }
+        while (found);
+
+        if (cleaned_count == 2)
+        {
+            // Ticket #9871: open polygon with only two points.
+            // the second point forms, by definition, a spike
+            --cleaned_e;
+            //--cleaned_count;
+        }
+
+        // Close if necessary
+        if ( BOOST_GEOMETRY_CONDITION(geometry::closure<Range>::value == geometry::closed) )
+        {
+            BOOST_GEOMETRY_ASSERT(cleaned_e != cleaned.end());
+            *cleaned_e = *cleaned_b;
+            ++cleaned_e;
+            //++cleaned_count;
+        }
+
+        // Copy output
+        geometry::clear(range);
+        std::copy(cleaned_b, cleaned_e, range::back_inserter(range));
+    }
+};
+
+
+struct polygon_remove_spikes
+{
+    template <typename Polygon, typename SideStrategy>
+    static inline void apply(Polygon& polygon, SideStrategy const& strategy)
+    {
+        typedef range_remove_spikes per_range;
+        per_range::apply(exterior_ring(polygon), strategy);
+
+        auto&& rings = interior_rings(polygon);
+
+        for (auto it = boost::begin(rings); it != boost::end(rings); ++it)
+        {
+            per_range::apply(*it, strategy);
+        }
+    }
+};
+
+
+template <typename SingleVersion>
+struct multi_remove_spikes
+{
+    template <typename MultiGeometry, typename SideStrategy>
+    static inline void apply(MultiGeometry& multi, SideStrategy const& strategy)
+    {
+        for (auto it = boost::begin(multi); it != boost::end(multi); ++it)
+        {
+            SingleVersion::apply(*it, strategy);
+        }
+    }
+};
+
+
+}} // namespace detail::remove_spikes
+#endif // DOXYGEN_NO_DETAIL
+
+
+
+#ifndef DOXYGEN_NO_DISPATCH
+namespace dispatch
+{
+
+
+template
+<
+    typename Geometry,
+    typename Tag = typename tag<Geometry>::type
+>
+struct remove_spikes
+{
+    template <typename SideStrategy>
+    static inline void apply(Geometry&, SideStrategy const&)
+    {}
+};
+
+
+template <typename Ring>
+struct remove_spikes<Ring, ring_tag>
+    : detail::remove_spikes::range_remove_spikes
+{};
+
+
+
+template <typename Polygon>
+struct remove_spikes<Polygon, polygon_tag>
+    : detail::remove_spikes::polygon_remove_spikes
+{};
+
+
+template <typename MultiPolygon>
+struct remove_spikes<MultiPolygon, multi_polygon_tag>
+    : detail::remove_spikes::multi_remove_spikes
+        <
+            detail::remove_spikes::polygon_remove_spikes
+        >
+{};
+
+
+} // namespace dispatch
+#endif
+
+
+namespace resolve_variant {
+
+template <typename Geometry>
+struct remove_spikes
+{
+    template <typename Strategy>
+    static void apply(Geometry& geometry, Strategy const& strategy)
+    {
+        concepts::check<Geometry>();
+        dispatch::remove_spikes<Geometry>::apply(geometry, strategy);
+    }
+
+    static void apply(Geometry& geometry, geometry::default_strategy const&)
+    {
+        typedef typename strategy::side::services::default_strategy
+            <
+                typename cs_tag<Geometry>::type
+            >::type side_strategy;
+
+        apply(geometry, side_strategy());
+    }
+};
+
+template <BOOST_VARIANT_ENUM_PARAMS(typename T)>
+struct remove_spikes<boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> >
+{
+    template <typename Strategy>
+    struct visitor: boost::static_visitor<void>
+    {
+        Strategy const& m_strategy;
+
+        visitor(Strategy const& strategy) : m_strategy(strategy) {}
+
+        template <typename Geometry>
+        void operator()(Geometry& geometry) const
+        {
+            remove_spikes<Geometry>::apply(geometry, m_strategy);
+        }
+    };
+
+    template <typename Strategy>
+    static inline void apply(boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>& geometry,
+                             Strategy const& strategy)
+    {
+        boost::apply_visitor(visitor<Strategy>(strategy), geometry);
+    }
+};
+
+} // namespace resolve_variant
+
+
+/*!
+    \ingroup remove_spikes
+    \tparam Geometry geometry type
+    \param geometry the geometry to make remove_spikes
+*/
+template <typename Geometry>
+inline void remove_spikes(Geometry& geometry)
+{
+    resolve_variant::remove_spikes<Geometry>::apply(geometry, geometry::default_strategy());
+}
+
+/*!
+    \ingroup remove_spikes
+    \tparam Geometry geometry type
+    \tparam Strategy side strategy type
+    \param geometry the geometry to make remove_spikes
+    \param strategy the side strategy used by the algorithm
+*/
+template <typename Geometry, typename Strategy>
+inline void remove_spikes(Geometry& geometry, Strategy const& strategy)
+{
+    resolve_variant::remove_spikes<Geometry>::apply(geometry, strategy);
+}
+
+
+}} // namespace boost::geometry
+
+
+#endif // BOOST_GEOMETRY_ALGORITHMS_REMOVE_SPIKES_HPP