60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
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/**********************************************************************
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*
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* GEOS - Geometry Engine Open Source
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* http://geos.osgeo.org
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*
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* Copyright (C) 2020-2021 Daniel Baston
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*
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* This is free software; you can redistribute and/or modify it under
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* the terms of the GNU Lesser General Public Licence as published
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* by the Free Software Foundation.
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* See the COPYING file for more information.
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*
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**********************************************************************/
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#ifndef GEOS_OPERATION_CLUSTER_DBSCANCLUSTERFINDER
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#define GEOS_OPERATION_CLUSTER_DBSCANCLUSTERFINDER
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#include <geos/operation/cluster/AbstractClusterFinder.h>
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#include <geos/geom/Geometry.h>
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#include <stdexcept>
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namespace geos {
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namespace operation {
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namespace cluster {
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/** DBSCANClusterFinder clusters geometries according to the DBSCAN algorithm.
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*
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*/
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class GEOS_DLL DBSCANClusterFinder : public AbstractClusterFinder {
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public:
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DBSCANClusterFinder(double eps, size_t minPoints) : m_eps(eps), m_minPoints(minPoints) {}
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protected:
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const geom::Envelope& queryEnvelope(const geom::Geometry* a) override {
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m_envelope = *a->getEnvelopeInternal();
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m_envelope.expandBy(m_eps);
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return m_envelope;
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}
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Clusters process(const std::vector<const geom::Geometry*> & components,
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index::strtree::TemplateSTRtree<std::size_t> & index,
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UnionFind & uf) override;
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bool shouldJoin(const geom::Geometry*, const geom::Geometry*) override {
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throw std::runtime_error("Never get here.");
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}
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private:
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double m_eps;
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size_t m_minPoints;
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geom::Envelope m_envelope;
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};
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}
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}
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}
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#endif
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