NodedSegmentString.h

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/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2020 Paul Ramsey <pramsey@cleverelephant.ca>
 * Copyright (C) 2011 Sandro Santilli <strk@kbt.io>
 * Copyright (C) 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: noding/NodedSegmentString.java r320 (JTS-1.12)
 *
 **********************************************************************/

#ifndef GEOS_NODING_NODEDSEGMENTSTRING_H
#define GEOS_NODING_NODEDSEGMENTSTRING_H

#include <geos/export.h>
#include <geos/noding/NodableSegmentString.h> // for inheritance
#include <geos/geom/CoordinateSequence.h> // for inlines
#include <geos/algorithm/LineIntersector.h>
#include <geos/noding/SegmentNode.h>
#include <geos/noding/SegmentNodeList.h>
#include <geos/noding/SegmentString.h>
#include <geos/geom/Coordinate.h>

#include <cstddef>

#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4251 4355) // warning C4355: 'this' : used in base member initializer list
#endif

namespace geos {
namespace noding { // geos::noding

class GEOS_DLL NodedSegmentString : public NodableSegmentString {
public:

    // TODO: provide a templated method using an output iterator
    template <class II>
    static void
    getNodedSubstrings(II from, II too_far,
                       SegmentString::NonConstVect* resultEdgelist)
    {
        for(II i = from; i != too_far; ++i) {
            NodedSegmentString* nss = dynamic_cast<NodedSegmentString*>(*i);
            assert(nss);
            nss->getNodeList().addSplitEdges(resultEdgelist);
        }
    }

    template <class C>
    static void
    getNodedSubstrings(C* segStrings,
                       SegmentString::NonConstVect* resultEdgelist)
    {
        getNodedSubstrings(segStrings->begin(), segStrings->end(), resultEdgelist);
    }

    static void getNodedSubstrings(const SegmentString::NonConstVect& segStrings,
                                   SegmentString::NonConstVect* resultEdgeList);

    static SegmentString::NonConstVect* getNodedSubstrings(
        const SegmentString::NonConstVect& segStrings);

    std::unique_ptr<std::vector<geom::Coordinate>> getNodedCoordinates();


    NodedSegmentString(geom::CoordinateSequence* newPts, const void* newContext)
        : NodableSegmentString(newContext)
        , nodeList(this)
        , pts(newPts)
    {}

    NodedSegmentString(SegmentString* ss)
        : NodableSegmentString(ss->getData())
        , nodeList(this)
        , pts(ss->getCoordinates()->clone())
    {}

    ~NodedSegmentString() override = default;

    SegmentNode*
    addIntersectionNode(geom::Coordinate* intPt, std::size_t segmentIndex)
    {
        std::size_t normalizedSegmentIndex = segmentIndex;

        // normalize the intersection point location
        std::size_t nextSegIndex = normalizedSegmentIndex + 1;
        if(nextSegIndex < size()) {
            geom::Coordinate const& nextPt =
                getCoordinate(nextSegIndex);

            // Normalize segment index if intPt falls on vertex
            // The check for point equality is 2D only - Z values are ignored
            if(intPt->equals2D(nextPt)) {
                normalizedSegmentIndex = nextSegIndex;
            }
        }

        // Add the intersection point to edge intersection list.
        SegmentNode* ei = getNodeList().add(*intPt, normalizedSegmentIndex);
        return ei;
    }

    SegmentNodeList& getNodeList();

    const SegmentNodeList& getNodeList() const;

    size_t
    size() const override
    {
        return pts->size();
    }

    const geom::Coordinate& getCoordinate(size_t i) const override;

    geom::CoordinateSequence* getCoordinates() const override;
    geom::CoordinateSequence* releaseCoordinates();

    bool isClosed() const override;

    std::ostream& print(std::ostream& os) const override;


    int getSegmentOctant(size_t index) const;

    void addIntersections(algorithm::LineIntersector* li,
                          size_t segmentIndex, size_t geomIndex);

    void addIntersection(algorithm::LineIntersector* li,
                         size_t segmentIndex,
                         size_t geomIndex, size_t intIndex);

    void addIntersection(const geom::Coordinate& intPt,
                         size_t segmentIndex);


private:

    SegmentNodeList nodeList;

    std::unique_ptr<geom::CoordinateSequence> pts;

    static int safeOctant(const geom::Coordinate& p0, const geom::Coordinate& p1);

};

} // namespace geos::noding
} // namespace geos

#ifdef _MSC_VER
#pragma warning(pop)
#endif

#endif // GEOS_NODING_NODEDSEGMENTSTRING_H