54 lines
1.6 KiB
C
54 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_ENVELOPEDISTANCECLUSTERFINDER
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#define GEOS_OPERATION_CLUSTER_ENVELOPEDISTANCECLUSTERFINDER
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#include <geos/operation/cluster/AbstractClusterFinder.h>
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#include <geos/geom/Envelope.h>
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namespace geos {
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namespace operation {
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namespace cluster {
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/** EnvelopeDistanceClusterFinder clusters geometries by the distance between their envelopes.
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* Any two geometries whose envelopes are within the specified distance will be included in the same cluster.
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*/
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class GEOS_DLL EnvelopeDistanceClusterFinder : public AbstractClusterFinder {
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public:
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explicit EnvelopeDistanceClusterFinder(double d) : m_distance(d), m_distance_squared(d*d) {}
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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_distance);
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return m_envelope;
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}
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bool shouldJoin(const geom::Geometry* a, const geom::Geometry *b) override {
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return a->getEnvelopeInternal()->distanceSquared(*b->getEnvelopeInternal()) <= m_distance_squared;
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}
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private:
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geom::Envelope m_envelope;
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double m_distance;
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double m_distance_squared;
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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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