DYT/Tool/OpenSceneGraph-3.6.5/include/geos/geomgraph/EdgeIntersectionList.h

/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2011 Sandro Santilli <strk@kbt.io>
 * Copyright (C) 2005-2006 Refractions Research Inc.
 * Copyright (C) 2001-2002 Vivid Solutions Inc.
 *
 * 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.
 *
 **********************************************************************
 *
 * Last port: geomgraph/EdgeIntersectionList.java r428 (JTS-1.12+)
 *
 **********************************************************************/


#pragma once

#include <geos/export.h>
#include <algorithm>
#include <vector>
#include <string>

#include <geos/geomgraph/EdgeIntersection.h> // for EdgeIntersectionLessThen
#include <geos/geom/Coordinate.h> // for CoordinateLessThan

#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class
#endif

// Forward declarations
namespace geos {
namespace geom {
class Coordinate;
}
namespace geomgraph {
class Edge;
}
}

namespace geos {
namespace geomgraph { // geos.geomgraph


/** \brief
 * A list of edge intersections along an Edge.
 *
 * Implements splitting an edge with intersections
 * into multiple resultant edges.
 */
class GEOS_DLL EdgeIntersectionList final {
public:
    // Instead of storing edge intersections in a set, as JTS does, we store them
    // in a vector and then sort the vector if needed before iterating among the
    // edges. This is much faster.
    using container = std::vector<EdgeIntersection>;
    using const_iterator = container::const_iterator;

private:
    mutable container nodeMap;
    mutable bool sorted;

public:

    const Edge* edge;
    EdgeIntersectionList(const Edge* edge);
    ~EdgeIntersectionList() = default;

    /*
     * Adds an intersection into the list, if it isn't already there.
     * The input segmentIndex and dist are expected to be normalized.
     * @return the EdgeIntersection found or added
     */
    void add(const geom::Coordinate& coord, std::size_t segmentIndex, double dist);

    const_iterator
    begin() const
    {
        if (!sorted) {
            std::sort(nodeMap.begin(), nodeMap.end());
            nodeMap.erase(std::unique(nodeMap.begin(), nodeMap.end()), nodeMap.end());
            sorted = true;
        }

        return nodeMap.begin();
    }
    const_iterator
    end() const
    {
        return nodeMap.end();
    }

    bool isEmpty() const;
    bool isIntersection(const geom::Coordinate& pt) const;

    /*
     * Adds entries for the first and last points of the edge to the list
     */
    void addEndpoints();

    /**
     * Creates new edges for all the edges that the intersections in this
     * list split the parent edge into.
     * Adds the edges to the input list (this is so a single list
     * can be used to accumulate all split edges for a Geometry).
     *
     * @param edgeList a list of EdgeIntersections
     */
    void addSplitEdges(std::vector<Edge*>* edgeList);

    Edge* createSplitEdge(const EdgeIntersection* ei0, const EdgeIntersection* ei1);
    std::string print() const;
};

std::ostream& operator<< (std::ostream&, const EdgeIntersectionList&);

} // namespace geos.geomgraph
} // namespace geos

#ifdef _MSC_VER
#pragma warning(pop)
#endif