OverlayLabeller.h

/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2020 Paul Ramsey <pramsey@cleverelephant.ca>
 *
 * This is free software; you can redistribute and/or modify it under
 * the terms of the GNU Lesser General Public Licence as published
 * by the Free Software Foundation.
 * See the COPYING file for more information.
 *
 **********************************************************************/
 
#pragma once
 
#include <geos/export.h>
#include <geos/geom/Location.h>
#include <geos/operation/overlayng/OverlayGraph.h>
 
#include <vector>
#include <deque>
 
// Forward declarations
namespace geos {
namespace geom {
class Coordinate;
}
namespace operation {
namespace overlayng {
class OverlayLabel;
class OverlayGraph;
class OverlayEdge;
class InputGeometry;
}
}
}
 
namespace geos {      // geos.
namespace operation { // geos.operation
namespace overlayng { // geos.operation.overlayng
 
 
class GEOS_DLL OverlayLabeller {
 
private:
 
    // Members
    OverlayGraph* graph;
    InputGeometry* inputGeometry;
    std::vector<OverlayEdge*>& edges;
 
    static OverlayEdge* findPropagationStartEdge(OverlayEdge* nodeEdge, uint8_t geomIndex);
 
    void labelCollapsedEdges();
    static void labelCollapsedEdge(OverlayEdge* edge, uint8_t geomIndex);
 
    void labelConnectedLinearEdges();
    void propagateLinearLocations(uint8_t geomIndex);
    static void propagateLinearLocationAtNode(OverlayEdge* eNode, uint8_t geomIndex, bool isInputLine, std::deque<OverlayEdge*>& edgeStack);
 
    static std::vector<OverlayEdge*> findLinearEdgesWithLocation(const std::vector<OverlayEdge *> &edges, uint8_t geomIndex);
 
    void labelDisconnectedEdges();
 
    void labelDisconnectedEdge(OverlayEdge* edge, uint8_t geomIndex);
 
    geom::Location locateEdge(uint8_t geomIndex, OverlayEdge* edge);
 
    geom::Location locateEdgeBothEnds(uint8_t geomIndex, OverlayEdge* edge);
 
    void labelAreaNodeEdges(std::vector<OverlayEdge*>& nodes);
 
 
 
public:
 
    OverlayLabeller(OverlayGraph* p_graph, InputGeometry* p_inputGeometry)
        : graph(p_graph)
        , inputGeometry(p_inputGeometry)
        , edges(p_graph->getEdges())
    {}
 
    void computeLabelling();
 
    void propagateAreaLocations(OverlayEdge* nodeEdge, uint8_t geomIndex);
 
    void markResultAreaEdges(int overlayOpCode);
 
    static void markInResultArea(OverlayEdge* e, int overlayOpCode);
 
    void unmarkDuplicateEdgesFromResultArea();
 
 
};
 
 
} // namespace geos.operation.overlayng
} // namespace geos.operation
} // namespace geos