125 lines
3.0 KiB
C++
125 lines
3.0 KiB
C++
/**********************************************************************
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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) 2024 Martin Davis
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* Copyright (C) 2024 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/geom/CoordinateSequence.h>
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#include <geos/geom/Location.h>
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#include <geos/export.h>
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// Forward declarations
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namespace geos {
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namespace operation {
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namespace relateng {
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class NodeSections;
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class NodeSection;
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}
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}
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namespace geom {
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class CoordinateXY;
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class Geometry;
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class LinearRing;
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class Polygon;
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}
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}
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using geos::geom::CoordinateXY;
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using geos::geom::CoordinateSequence;
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using geos::geom::Geometry;
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using geos::geom::LinearRing;
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using geos::geom::Polygon;
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using geos::geom::Location;
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namespace geos { // geos.
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namespace operation { // geos.operation
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namespace relateng { // geos.operation.relateng
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/**
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* Determines the location for a point which is known to lie
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* on at least one edge of a set of polygons.
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* This provides the union-semantics for determining
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* point location in a GeometryCollection, which may
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* have polygons with adjacent edges which are effectively
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* in the interior of the geometry.
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* Note that it is also possible to have adjacent edges which
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* lie on the boundary of the geometry
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* (e.g. a polygon contained within another polygon with adjacent edges).
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*
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* @author mdavis
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*
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*/
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class GEOS_DLL AdjacentEdgeLocator {
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public:
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AdjacentEdgeLocator(const Geometry* geom)
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{
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init(geom);
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}
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Location locate(const CoordinateXY* p);
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/**
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* Disable copy construction and assignment. Apparently needed to make this
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* class compile under MSVC. (See https://stackoverflow.com/q/29565299)
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*/
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AdjacentEdgeLocator(const AdjacentEdgeLocator&) = delete;
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AdjacentEdgeLocator& operator=(const AdjacentEdgeLocator&) = delete;
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private:
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// Members
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std::vector<const CoordinateSequence*> ringList;
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/*
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* When we have to reorient rings, we end up allocating new
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* rings, since we cannot reorient the rings of the input
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* geometry, so this is where we store those "local" rings.
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*/
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std::vector<std::unique_ptr<CoordinateSequence>> localRingList;
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// Methods
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void addSections(
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const CoordinateXY* p,
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const CoordinateSequence* ring,
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NodeSections& sections);
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NodeSection* createSection(
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const CoordinateXY* p,
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const CoordinateXY* prev,
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const CoordinateXY* next);
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void init(const Geometry* geom);
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void addRings(const Geometry* geom);
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void addRing(const LinearRing* ring, bool requireCW);
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};
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} // namespace geos.operation.relateng
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} // namespace geos.operation
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} // namespace geos
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