NodedSegmentString.h

/**********************************************************************
 *
 * 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)
 *
 **********************************************************************/
 
#pragma once
 
#include <geos/export.h>
#include <geos/algorithm/LineIntersector.h>
#include <geos/geom/Coordinate.h>
#include <geos/geom/CoordinateSequence.h> // for inlines
#include <geos/noding/NodedSegmentString.h>
#include <geos/noding/NodableSegmentString.h> // for inheritance
#include <geos/noding/Octant.h>
#include <geos/noding/SegmentNode.h>
#include <geos/noding/SegmentNodeList.h>
#include <geos/noding/SegmentString.h>
#include <geos/util/IllegalArgumentException.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::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;
 
    SegmentNodeList& getNodeList();
 
    const SegmentNodeList& getNodeList() const;
 
    size_t
    size() const override
    {
        return pts->size();
    }
 
    const geom::Coordinate& getCoordinate(std::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(std::size_t index) const
    {
        if (index >= size() - 1) {
            return -1;
        }
        return safeOctant(getCoordinate(index), getCoordinate(index + 1));
        //return Octant::octant(getCoordinate(index), getCoordinate(index+1));
    };
 
    void addIntersections(algorithm::LineIntersector* li,
        std::size_t segmentIndex, std::size_t geomIndex)
    {
        for (std::size_t i = 0, n = li->getIntersectionNum(); i < n; ++i) {
            addIntersection(li, segmentIndex, geomIndex, i);
        }
    };
 
    void addIntersection(algorithm::LineIntersector* li,
        std::size_t segmentIndex,
        std::size_t geomIndex, std::size_t intIndex)
    {
        ::geos::ignore_unused_variable_warning(geomIndex);
 
        const geom::Coordinate& intPt = li->getIntersection(intIndex);
        addIntersection(intPt, segmentIndex);
    };
 
    void addIntersection(const geom::Coordinate& intPt,
        std::size_t segmentIndex)
    {
        std::size_t normalizedSegmentIndex = segmentIndex;
 
        if (segmentIndex > size() - 2) {
            throw util::IllegalArgumentException("SegmentString::addIntersection: SegmentIndex out of range");
        }
 
        // normalize the intersection point location
        auto nextSegIndex = normalizedSegmentIndex + 1;
        if (nextSegIndex < size()) {
            const geom::Coordinate& nextPt = pts->getAt(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
         * (unless the node is already known)
         */
        nodeList.add(intPt, normalizedSegmentIndex);
    };
 
private:
 
    SegmentNodeList nodeList;
 
    std::unique_ptr<geom::CoordinateSequence> pts;
 
    static int safeOctant(const geom::Coordinate& p0, const geom::Coordinate& p1)
    {
        if(p0.equals2D(p1)) {
            return 0;
        }
        return Octant::octant(p0, p1);
    };
 
};
 
} // namespace geos::noding
} // namespace geos
 
#ifdef _MSC_VER
#pragma warning(pop)
#endif