96 lines
2.0 KiB
C
96 lines
2.0 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 Paul Ramsey <pramsey@cleverelephant.ca>
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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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#pragma once
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#include <geos/export.h>
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#include <geos/geom/PrecisionModel.h>
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#include <geos/operation/union/UnionStrategy.h>
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#include <geos/operation/overlayng/OverlayNG.h>
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#include <geos/operation/overlayng/OverlayUtil.h>
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// Forward declarations
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namespace geos {
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namespace geom {
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class Geometry;
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}
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}
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namespace geos { // geos.
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namespace operation { // geos.operation
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namespace overlayng { // geos.operation.overlayng
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/**
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* Unions a collection of geometries in an
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* efficient way, using {@link OverlayNG}
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* to ensure robust computation.
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*
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* @author Martin Davis
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*
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*/
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class GEOS_DLL UnaryUnionNG {
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private:
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// Members
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public:
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/**
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* Strategy class for NG unions.
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*/
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class NGUnionStrategy : public operation::geounion::UnionStrategy {
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public:
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NGUnionStrategy(const PrecisionModel& p_pm)
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: pm(p_pm)
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{};
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std::unique_ptr<geom::Geometry>
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Union(const geom::Geometry* g0, const geom::Geometry* g1) override
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{
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return OverlayNG::overlay(g0, g1, OverlayNG::UNION, &pm);
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}
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bool
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isFloatingPrecision() const override
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{
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return OverlayUtil::isFloating(&pm);
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}
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private:
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const geom::PrecisionModel& pm;
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};
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// static methods
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static std::unique_ptr<Geometry> Union(const Geometry* geom, const PrecisionModel& pm);
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static std::unique_ptr<Geometry> Union(const Geometry* geom);
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};
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} // namespace geos.operation.overlayng
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} // namespace geos.operation
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} // namespace geos
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