Added thirdparty: boost library

2026-08-17 04:38:10 +00:00 · 2024-01-06 19:55:56 +02:00
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+// Boost.Geometry (aka GGL, Generic Geometry Library)
+
+// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
+// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
+// Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
+// Copyright (c) 2017-2023 Adam Wulkiewicz, Lodz, Poland.
+
+// This file was modified by Oracle on 2015-2021.
+// Modifications copyright (c) 2015-2021 Oracle and/or its affiliates.
+
+// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
+
+// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
+// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
+
+// 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_STRATEGIES_CARTESIAN_CENTROID_AVERAGE_HPP
+#define BOOST_GEOMETRY_STRATEGIES_CARTESIAN_CENTROID_AVERAGE_HPP
+
+
+#include <cstddef>
+
+#include <boost/geometry/algorithms/assign.hpp>
+#include <boost/geometry/algorithms/detail/signed_size_type.hpp>
+#include <boost/geometry/arithmetic/arithmetic.hpp>
+#include <boost/geometry/core/coordinate_type.hpp>
+#include <boost/geometry/core/point_type.hpp>
+#include <boost/geometry/strategies/centroid.hpp>
+
+
+namespace boost { namespace geometry
+{
+
+namespace strategy { namespace centroid
+{
+
+
+/*!
+\brief Centroid calculation taking average of points
+\ingroup strategies
+*/
+template
+<
+    typename Ignored1 = void,
+    typename Ignored2 = void
+>
+class average
+{
+private :
+
+    /*! subclass to keep state */
+    template <typename GeometryPoint, typename ResultPoint>
+    class sum
+    {
+        friend class average;
+        signed_size_type count;
+        ResultPoint centroid;
+
+    public :
+        inline sum()
+            : count(0)
+        {
+            assign_zero(centroid);
+        }
+    };
+
+public :
+    template <typename GeometryPoint, typename ResultPoint>
+    struct state_type
+    {
+        typedef sum<GeometryPoint, ResultPoint> type;
+    };
+
+    template <typename GeometryPoint, typename ResultPoint>
+    static inline void apply(GeometryPoint const& p,
+                             sum<GeometryPoint, ResultPoint>& state)
+    {
+        add_point(state.centroid, p);
+        state.count++;
+    }
+
+    template <typename GeometryPoint, typename ResultPoint>
+    static inline bool result(sum<GeometryPoint, ResultPoint> const& state,
+                              ResultPoint& centroid)
+    {
+        centroid = state.centroid;
+        if ( state.count > 0 )
+        {
+            using coord_t = typename coordinate_type<ResultPoint>::type;
+            divide_value(centroid, static_cast<coord_t>(state.count));
+            return true;
+        }
+        return false;
+    }
+
+};
+
+
+#ifndef DOXYGEN_NO_STRATEGY_SPECIALIZATIONS
+
+
+namespace services
+{
+
+template <typename Point, std::size_t DimensionCount, typename Geometry>
+struct default_strategy
+<
+    cartesian_tag,
+    pointlike_tag,
+    DimensionCount,
+    Point,
+    Geometry
+>
+{
+    typedef average
+        <
+            Point,
+            typename point_type<Geometry>::type
+        > type;
+};
+
+} // namespace services
+
+#endif
+
+
+}} // namespace strategy::centroid
+
+
+}} // namespace boost::geometry
+
+
+#endif // BOOST_GEOMETRY_STRATEGIES_CARTESIAN_CENTROID_AVERAGE_HPP