NodingIntersectionFinder.h

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/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2006      Refractions Research 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.
 *
 **********************************************************************/

#ifndef GEOS_NODING_NODINGINTERSECTIONFINDER_H
#define GEOS_NODING_NODINGINTERSECTIONFINDER_H

#include <geos/noding/SegmentIntersector.h> // for inheritance
#include <geos/geom/Coordinate.h> // for composition

#include <vector>

// Forward declarations
namespace geos {
namespace algorithm {
class LineIntersector;
}
namespace noding {
class SegmentString;
}
}

namespace geos {
namespace noding { // geos.noding

class NodingIntersectionFinder: public SegmentIntersector {

public:

    NodingIntersectionFinder(algorithm::LineIntersector& newLi)
        :
        li(newLi),
        interiorIntersection(geom::Coordinate::getNull()),
        intersectionCount(0),
        isCheckEndSegmentsOnly(false),
        findAllIntersections(false)
    {
    }

    bool
    hasIntersection() const
    {
        return !interiorIntersection.isNull();
    }

    const geom::Coordinate&
    getInteriorIntersection() const
    {
        return interiorIntersection;
    }

    size_t
    count() const
    {
        return intersectionCount;
    }

    void
    setCheckEndSegmentsOnly(bool isCESO)
    {
        isCheckEndSegmentsOnly = isCESO;
    }


    void
    setFindAllIntersections(bool fAI)
    {
        findAllIntersections = fAI;
    }

    const std::vector<geom::Coordinate>&
    getIntersectionSegments() const
    {
        return intSegments;
    }

    void processIntersections(
        SegmentString* e0,  size_t segIndex0,
        SegmentString* e1,  size_t segIndex1) override;

    bool
    isDone() const override
    {
        return !interiorIntersection.isNull();
    }

private:
    algorithm::LineIntersector& li;
    geom::Coordinate interiorIntersection;
    size_t intersectionCount;
    bool isCheckEndSegmentsOnly;
    bool findAllIntersections;
    std::vector<geom::Coordinate> intSegments;

    // Declare type as noncopyable
    NodingIntersectionFinder(const NodingIntersectionFinder& other) = delete;
    NodingIntersectionFinder& operator=(const NodingIntersectionFinder& rhs) = delete;

    bool isInteriorVertexIntersection(
        const geom::Coordinate& p0, const geom::Coordinate& p1,
        bool isEnd0, bool isEnd1);

    bool isInteriorVertexIntersection(
        const geom::Coordinate& p00, const geom::Coordinate& p01,
        const geom::Coordinate& p10, const geom::Coordinate& p11,
        bool isEnd00, bool isEnd01, bool isEnd10, bool isEnd11);

    bool isEndSegment(const SegmentString* segStr, size_t index);


};

} // namespace geos.noding
} // namespace geos

#endif // GEOS_NODING_NODINGINTERSECTIONFINDER_H