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// Copyright (c) 2012-2013, IGN France. // Copyright (c) 2012-2024, Oslandia. // Copyright (c) 2024-2025, SFCGAL team. // SPDX-License-Identifier: LGPL-2.0-or-later #ifndef SFCGAL_ALGORITHM_CENTROID_H_ #define SFCGAL_ALGORITHM_CENTROID_H_ #include "SFCGAL/Geometry.h" #include "SFCGAL/Kernel.h" namespace SFCGAL { namespace algorithm { /** * Holds weighted data to compute the centroid for a Geometry * @ingroup detail */ class SFCGAL_API WeightedCentroid { public: /// total area or length SFCGAL::Kernel::FT area; /// 3D centroid CGAL::Vector_3 centroid; /// weighted average of m SFCGAL::Kernel::FT m; /** * Default constructor */ WeightedCentroid( SFCGAL::Kernel::FT a = 0.0, CGAL::Vector_3 c = CGAL::Vector_3(), SFCGAL::Kernel::FT mTmp = 0.0) : area(a), centroid(c), m(mTmp) { } }; /** * @brief Returns the 2D centroid for a Geometry * * The result is the weighted centroid of a geometry. The implementation follows * PostGIS one (https://postgis.net/docs/ST_Centroid.html). The weigth is * computed in the XY space. * * @warning Z component is ignored, geometries must be valid when projected in * the XY plane. Vertical geometries will generate an error. * @pre g is a valid geometry in 2D */ SFCGAL_API std::unique_ptr centroid(const Geometry &g); /** * @brief Returns the 3D centroid for a Geometry * * The result is the weighted centroid of a geometry. The implementation follows * PostGIS one (https://postgis.net/docs/ST_Centroid.html). The weigth is * computed in the 3D space. * * @pre g is a valid geometry */ SFCGAL_API std::unique_ptr centroid3D(const Geometry &g); /** * Returns the weighted centroid for a Geometry * @ingroup detail */ SFCGAL_API WeightedCentroid weightedCentroid(const Geometry &g, bool enable3DComputation = false); /** * Returns the weighted centroid for a Triangle * @ingroup detail */ SFCGAL_API WeightedCentroid weightedCentroid(const Triangle &g, bool enable3DComputation = false); /** * Returns the weighted centroid for a Triangle * @ingroup detail */ SFCGAL_API WeightedCentroid weightedCentroid(const Point &a, const Point &b, const Point &c, bool enable3DComputation = false); /** * Returns the weighted centroid for a LineString * @ingroup detail */ SFCGAL_API WeightedCentroid weightedCentroid(const LineString &g, bool enable3DComputation = false); /** * Returns the weighted centroid for a Polygon * @ingroup detail */ SFCGAL_API WeightedCentroid weightedCentroid(const Polygon &g, bool enable3DComputation = false); /** * Returns the weighted centroid for a GeometryCollection * @ingroup detail */ SFCGAL_API WeightedCentroid weightedCentroid(const GeometryCollection &g, bool enable3DComputation = false); /** * Returns the weighted centroid for a TriangulatedSurface * @ingroup detail */ SFCGAL_API WeightedCentroid weightedCentroid(const TriangulatedSurface &g, bool enable3DComputation = false); /** * Returns the weighted centroid for a PolyhedralSurface * @ingroup detail */ SFCGAL_API WeightedCentroid weightedCentroid(const PolyhedralSurface &g, bool enable3DComputation = false); /** * Returns the weighted centroid for a Solid * @ingroup detail */ SFCGAL_API WeightedCentroid weightedCentroid(const Solid &g, bool enable3DComputation = false); } // namespace algorithm } // namespace SFCGAL #endif