74 lines
1.9 KiB
C
74 lines
1.9 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 <memory>
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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 {
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namespace operation { // geos::operation
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namespace geounion { // geos::operation::geounion
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/**
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* A strategy class that adapts UnaryUnion to different
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* kinds of overlay algorithms.
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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 UnionStrategy {
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public:
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virtual ~UnionStrategy() {};
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/**
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* Computes the union of two geometries.
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* This method may throw a {@link util::TopologyException}
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* if one is encountered
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*/
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virtual std::unique_ptr<geom::Geometry> Union(const geom::Geometry*, const geom::Geometry*) = 0;
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virtual std::unique_ptr<geom::Geometry> Union(std::unique_ptr<geom::Geometry> &&,
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std::unique_ptr<geom::Geometry> &&);
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/**
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* Indicates whether the union function operates using
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* a floating (full) precision model.
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* If this is the case, then the unary union code
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* can make use of the operation::union::OverlapUnion performance optimization,
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* and perhaps other optimizations as well.
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* Otherwise, the union result extent may not be the same as the extent of the inputs,
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* which prevents using some optimizations.
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*/
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virtual bool isFloatingPrecision() const = 0;
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};
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} // namespace geos::operation::geounion
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} // namespace geos::operation
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} // namespace geos
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