121 lines
3.1 KiB
C
121 lines
3.1 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/Geometry.h>
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#include <geos/geom/Point.h>
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#include <map>
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#include <vector>
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// Forward declarations
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namespace geos {
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namespace geom {
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class Coordinate;
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class CoordinateSequence;
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class GeometryFactory;
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class Geometry;
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class PrecisionModel;
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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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using namespace geos::geom;
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/**
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* Performs an overlay operation on inputs which are both point geometries.
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*
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* Semantics are:
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*
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* - Points are rounded to the precision model if provided
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* - Points with identical XY values are merged to a single point
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* - Extended ordinate values are preserved in the output,
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* apart from merging
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* - An empty result is returned as <code>POINT EMPTY</code>
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*
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* @author Martin Davis
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*/
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class GEOS_DLL OverlayPoints {
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private:
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// Members
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int opCode;
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const Geometry* geom0;
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const Geometry* geom1;
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const PrecisionModel* pm;
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const GeometryFactory* geometryFactory;
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std::vector<std::unique_ptr<Point>> resultList;
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using PointMap = std::map<CoordinateXY, std::unique_ptr<Point>>;
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// Methods
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void
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computeIntersection(PointMap& map0,
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PointMap& map1,
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std::vector<std::unique_ptr<Point>>& resultList);
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void
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computeDifference(PointMap& map0,
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PointMap& map1,
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std::vector<std::unique_ptr<Point>>& resultList);
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void
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computeUnion(PointMap& map0,
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PointMap& map1,
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std::vector<std::unique_ptr<Point>>& resultList);
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PointMap buildPointMap(const Geometry* geom);
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public:
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/**
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* Creates an instance of an overlay operation on inputs which are both point geometries.
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*/
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OverlayPoints(int p_opCode, const Geometry* p_geom0, const Geometry* p_geom1, const PrecisionModel* p_pm)
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: opCode(p_opCode)
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, geom0(p_geom0)
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, geom1(p_geom1)
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, pm(p_pm)
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, geometryFactory(p_geom0->getFactory()) {}
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OverlayPoints(const OverlayPoints&) = delete;
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OverlayPoints& operator=(const OverlayPoints&) = delete;
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/**
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* Performs an overlay operation on inputs which are both point geometries.
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*/
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static std::unique_ptr<Geometry> overlay(int opCode, const Geometry* geom0, const Geometry* geom1, const PrecisionModel* pm);
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/**
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* Gets the result of the overlay.
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*
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* @return the overlay result
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*/
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std::unique_ptr<Geometry> getResult();
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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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