147 lines
3.8 KiB
C++
147 lines
3.8 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/operation/relateng/RelateEdge.h>
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#include <vector>
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#include <memory>
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#include <cassert>
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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 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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}
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}
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using geos::geom::CoordinateXY;
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using geos::geom::Geometry;
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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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class GEOS_DLL RelateNode {
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private:
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// Members
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/**
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* A list of the edges around the node in CCW order,
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* ordered by their CCW angle with the positive X-axis.
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*/
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std::vector<std::unique_ptr<RelateEdge>> edges;
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const CoordinateXY* nodePt;
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// Methods
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void updateEdgesInArea(bool isA, std::size_t indexFrom, std::size_t indexTo);
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void updateIfAreaPrev(bool isA, std::size_t index);
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void updateIfAreaNext(bool isA, std::size_t index);
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const RelateEdge* addLineEdge(bool isA, const CoordinateXY* dirPt);
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const RelateEdge* addAreaEdge(bool isA, const CoordinateXY* dirPt, bool isForward);
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/**
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* Adds or merges an edge to the node.
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*
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* @param isA
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* @param dirPt
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* @param dim dimension of the geometry element containing the edge
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* @param isForward the direction of the edge
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*
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* @return the created or merged edge for this point
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*/
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const RelateEdge* addEdge(bool isA, const CoordinateXY* dirPt, int dim, bool isForward);
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void finishNode(bool isA, bool isAreaInterior);
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void propagateSideLocations(bool isA, std::size_t startIndex);
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static std::size_t prevIndex(std::vector<std::unique_ptr<RelateEdge>>& list, std::size_t index);
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static std::size_t nextIndex(std::vector<std::unique_ptr<RelateEdge>>& list, std::size_t i);
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std::size_t indexOf(
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const std::vector<std::unique_ptr<RelateEdge>>& edges,
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const RelateEdge* edge) const;
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public:
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RelateNode(const CoordinateXY* pt)
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: nodePt(pt)
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{};
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const CoordinateXY* getCoordinate() const;
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const std::vector<std::unique_ptr<RelateEdge>>& getEdges() const;
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void addEdges(std::vector<const NodeSection *>& nss);
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void addEdges(std::vector<std::unique_ptr<NodeSection>>& nss);
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void addEdges(const NodeSection* ns);
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/**
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* Computes the final topology for the edges around this node.
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* Although nodes lie on the boundary of areas or the interior of lines,
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* in a mixed GC they may also lie in the interior of an area.
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* This changes the locations of the sides and line to Interior.
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*
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* @param isAreaInteriorA true if the node is in the interior of A
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* @param isAreaInteriorB true if the node is in the interior of B
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*/
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void finish(bool isAreaInteriorA, bool isAreaInteriorB);
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std::string toString() const;
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bool hasExteriorEdge(bool isA);
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friend std::ostream& operator<<(std::ostream& os, const RelateNode& ns);
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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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RelateNode(const RelateNode&) = delete;
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RelateNode& operator=(const RelateNode&) = delete;
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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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