RelateGeometry.h

/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (c) 2024 Martin Davis
 * Copyright (C) 2024 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/algorithm/BoundaryNodeRule.h>
#include <geos/geom/Coordinate.h>
#include <geos/geom/Dimension.h>
#include <geos/geom/Location.h>
#include <geos/operation/relateng/RelatePointLocator.h>
#include <geos/operation/relateng/RelateSegmentString.h>
#include <geos/export.h>
 
#include <string>
#include <sstream>
 
 
// Forward declarations
namespace geos {
namespace geom {
    class CoordinateSequence;
    class Envelope;
    class Geometry;
    class LinearRing;
    class LineString;
    class MultiPolygon;
    class Point;
}
namespace noding {
    class SegmentString;
}
}
 
 
namespace geos {      // geos.
namespace operation { // geos.operation
namespace relateng { // geos.operation.relateng
 
using namespace geos::geom;
using geos::algorithm::BoundaryNodeRule;
using geos::noding::SegmentString;
 
 
class GEOS_DLL RelateGeometry {
 
private:
 
    // Members
 
    const Geometry* geom;
    bool m_isPrepared = false;
    const Envelope* geomEnv;
    const BoundaryNodeRule& boundaryNodeRule;
    int geomDim = Dimension::False;
    bool isLineZeroLen = false;
    bool isGeomEmpty = false;
 
    Coordinate::ConstXYSet uniquePoints;
    std::unique_ptr<RelatePointLocator> locator;
    int elementId = 0;
    bool hasPoints = false;
    bool hasLines = false;
    bool hasAreas = false;
 
    /*
     * Memory contexts for lower level allocations
     */
    std::vector<std::unique_ptr<const RelateSegmentString>> segStringTempStore;
    std::vector<std::unique_ptr<const RelateSegmentString>> segStringPermStore;
    std::vector<std::unique_ptr<CoordinateSequence>> csStore;
 
 
    // Methods
 
    void analyzeDimensions();
 
    static bool isZeroLength(const Geometry* geom);
 
    static bool isZeroLength(const LineString* line);
 
    bool isZeroLengthLine(const Geometry* g) const {
        // avoid expensive zero-length calculation if not linear
        if (getDimension() != Dimension::L)
            return false;
        return isZeroLength(g);
    };
 
    RelatePointLocator* getLocator();
 
    Coordinate::ConstXYSet createUniquePoints();
 
    void extractSegmentStringsFromAtomic(bool isA,
        const Geometry* geom, const MultiPolygon* parentPolygonal,
        const Envelope* env,
        std::vector<const SegmentString*>& segStrings,
        std::vector<std::unique_ptr<const RelateSegmentString>>& segStore);
 
    void extractRingToSegmentString(bool isA,
        const LinearRing* ring, int ringId, const Envelope* env,
        const Geometry* parentPoly,
        std::vector<const SegmentString*>& segStrings,
        std::vector<std::unique_ptr<const RelateSegmentString>>& segStore);
 
    void extractSegmentStrings(bool isA,
        const Envelope* env, const Geometry* geom,
        std::vector<const SegmentString*>& segStrings,
        std::vector<std::unique_ptr<const RelateSegmentString>>& segStore);
 
    const CoordinateSequence* orientAndRemoveRepeated(
        const CoordinateSequence* cs, bool orientCW);
 
    const CoordinateSequence* removeRepeated(
        const CoordinateSequence* cs);
 
public:
 
    static constexpr bool GEOM_A = true;
    static constexpr bool GEOM_B = false;
 
    RelateGeometry(const Geometry* input)
        : RelateGeometry(input, false, BoundaryNodeRule::getBoundaryRuleMod2())
        {};
 
    RelateGeometry(const Geometry* input, const BoundaryNodeRule& bnRule)
        : RelateGeometry(input, false, bnRule)
        {};
 
    RelateGeometry(const Geometry* input, bool p_isPrepared, const BoundaryNodeRule& bnRule);
 
    static std::string name(bool isA);
 
    const Geometry* getGeometry() const {
        return geom;
    }
 
    bool isPrepared() const {
        return m_isPrepared;
    }
 
    const Envelope* getEnvelope() const {
        return geomEnv;
    }
 
    inline int getDimension() const {
        return geomDim;
    }
 
    bool hasDimension(int dim) const {
        switch (dim) {
            case Dimension::P: return hasPoints;
            case Dimension::L: return hasLines;
            case Dimension::A: return hasAreas;
        }
        return false;
    }    
    
    bool hasAreaAndLine() const {
        return hasAreas && hasLines;
    }
 
    int getDimensionReal() const;
 
    bool hasEdges() const;
 
    bool isNodeInArea(const CoordinateXY* nodePt, const Geometry* parentPolygonal);
 
    int locateLineEndWithDim(const CoordinateXY* p);
 
    Location locateAreaVertex(const CoordinateXY* pt);
 
    Location locateNode(const CoordinateXY* pt, const Geometry* parentPolygonal);
 
    int locateWithDim(const CoordinateXY* pt);
 
    bool isSelfNodingRequired() const;
 
    bool isPolygonal() const;
 
    bool isEmpty() const;
 
    bool hasBoundary();
 
    Coordinate::ConstXYSet& getUniquePoints();
 
    std::vector<const Point*> getEffectivePoints();
 
    std::vector<const SegmentString*> extractSegmentStrings(bool isA, const Envelope* env);
 
    std::string toString() const;
 
    friend std::ostream& operator<<(std::ostream& os, const RelateGeometry& rg);
 
    RelateGeometry(const RelateGeometry&) = delete;
    RelateGeometry& operator=(const RelateGeometry&) = delete;
 
};
 
} // namespace geos.operation.relateng
} // namespace geos.operation
} // namespace geos