144 lines
3.8 KiB
C++
144 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) 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/Coordinate.h>
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#include <geos/operation/overlayng/OverlayEdge.h>
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#include <geos/operation/overlayng/OverlayLabel.h>
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#include <geos/geom/CoordinateSequence.h>
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#include <unordered_map>
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#include <vector>
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#include <deque>
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// Forward declarations
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namespace geos {
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namespace geom {
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}
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namespace operation {
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namespace overlayng {
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class Edge;
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}
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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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* A planar graph of {@link OverlayEdge}, representing
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* the topology resulting from an overlay operation.
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* Each source {@link Edge} is represented
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* by two OverlayEdges, with opposite orientation.
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* A single {@link OverlayLabel} is created for each symmetric pair of OverlayEdges.
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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 OverlayGraph {
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private:
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// Members
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std::unordered_map<Coordinate, OverlayEdge*, geom::Coordinate::HashCode> nodeMap;
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std::vector<OverlayEdge*> edges;
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// Locally store the OverlayEdge and OverlayLabel
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std::deque<OverlayEdge> ovEdgeQue;
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std::deque<OverlayLabel> ovLabelQue;
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std::vector<std::unique_ptr<const geom::CoordinateSequence>> csQue;
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// Methods
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/**
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* Create and add HalfEdge pairs to map and vector containers,
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* using local std::deque storage for objects.
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*/
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OverlayEdge* createEdgePair(const CoordinateSequence* pts, OverlayLabel* lbl);
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/**
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* Create a single OverlayEdge in local std::deque storage, and return the
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* pointer.
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*/
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OverlayEdge* createOverlayEdge(const CoordinateSequence* pts, OverlayLabel* lbl, bool direction);
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void insert(OverlayEdge* e);
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public:
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/**
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* Creates a new graph for a set of noded, labelled {@link Edge}s.
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*/
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OverlayGraph();
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OverlayGraph(const OverlayGraph& g) = delete;
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OverlayGraph& operator=(const OverlayGraph& g) = delete;
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/**
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* Adds an edge between the coordinates orig and dest
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* to this graph.
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* Only valid edges can be added (in particular, zero-length segments cannot be added)
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*
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*/
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OverlayEdge* addEdge(Edge* edge);
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/**
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* Gets the set of edges in this graph.
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* Only one of each symmetric pair of OverlayEdges is included.
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* The opposing edge can be found by using {@link OverlayEdge#sym()}.
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*/
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std::vector<OverlayEdge*>& getEdges();
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/**
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* Gets the collection of edges representing the nodes in this graph.
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* For each star of edges originating at a node
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* a single representative edge is included.
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* The other edges around the node can be found by following the next and prev links.
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*/
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std::vector<OverlayEdge*> getNodeEdges();
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/**
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* Gets an edge originating at the given node point.
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*/
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OverlayEdge* getNodeEdge(const Coordinate& nodePt) const;
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/**
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* Gets the representative edges marked as being in the result area.
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*/
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std::vector<OverlayEdge*> getResultAreaEdges();
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/**
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* Create a single OverlayLabel in local std::deque storage
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* and return a pointer to the stored object.
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*/
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OverlayLabel* createOverlayLabel(const Edge* edge);
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friend std::ostream& operator<<(std::ostream& os, const OverlayGraph& og);
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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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