qgsgeos.h

Go to the documentation of this file.

/***************************************************************************
                        qgsgeos.h
  -------------------------------------------------------------------
Date                 : 22 Sept 2014
Copyright            : (C) 2014 by Marco Hugentobler
email                : marco.hugentobler at sourcepole dot com
 ***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
 
#ifndef QGSGEOS_H
#define QGSGEOS_H
 
#define SIP_NO_FILE
 
#include "qgis_core.h"
#include "qgsgeometryengine.h"
#include "qgsgeometry.h"
#include <geos_c.h>
 
#if defined(GEOS_VERSION_MAJOR) && (GEOS_VERSION_MAJOR<3)
#define GEOSGeometry struct GEOSGeom_t
#define GEOSCoordSequence struct GEOSCoordSeq_t
#endif
 
class QgsLineString;
class QgsPolygon;
class QgsGeometry;
class QgsGeometryCollection;
 
namespace geos
{
 
  struct GeosDeleter
  {
 
    void CORE_EXPORT operator()( GEOSGeometry *geom );
 
    void CORE_EXPORT operator()( const GEOSPreparedGeometry *geom );
 
    void CORE_EXPORT operator()( GEOSBufferParams *params );
 
    void CORE_EXPORT operator()( GEOSCoordSequence *sequence );
  };
 
  using unique_ptr = std::unique_ptr< GEOSGeometry, GeosDeleter>;
 
  using prepared_unique_ptr = std::unique_ptr< const GEOSPreparedGeometry, GeosDeleter>;
 
  using buffer_params_unique_ptr = std::unique_ptr< GEOSBufferParams, GeosDeleter>;
 
  using coord_sequence_unique_ptr = std::unique_ptr< GEOSCoordSequence, GeosDeleter>;
 
}
 
class CORE_EXPORT QgsGeos: public QgsGeometryEngine
{
  public:
 
    QgsGeos( const QgsAbstractGeometry *geometry, double precision = 0 );
 
    static QgsGeometry geometryFromGeos( GEOSGeometry *geos );
 
    static QgsGeometry geometryFromGeos( const geos::unique_ptr &geos );
 
#if GEOS_VERSION_MAJOR>3 || ( GEOS_VERSION_MAJOR == 3 && GEOS_VERSION_MINOR>=8 )
 
    std::unique_ptr< QgsAbstractGeometry > makeValid( QString *errorMsg = nullptr ) const;
#endif
 
    static QgsGeometry::OperationResult addPart( QgsGeometry &geometry, GEOSGeometry *newPart );
 
    void geometryChanged() override;
    void prepareGeometry() override;
 
    QgsAbstractGeometry *intersection( const QgsAbstractGeometry *geom, QString *errorMsg = nullptr ) const override;
    QgsAbstractGeometry *difference( const QgsAbstractGeometry *geom, QString *errorMsg = nullptr ) const override;
 
    std::unique_ptr< QgsAbstractGeometry > clip( const QgsRectangle &rectangle, QString *errorMsg = nullptr ) const;
 
    std::unique_ptr< QgsAbstractGeometry > subdivide( int maxNodes, QString *errorMsg = nullptr ) const;
 
    QgsAbstractGeometry *combine( const QgsAbstractGeometry *geom, QString *errorMsg = nullptr ) const override;
    QgsAbstractGeometry *combine( const QVector<QgsAbstractGeometry *> &geomList, QString *errorMsg ) const override;
    QgsAbstractGeometry *combine( const QVector< QgsGeometry > &, QString *errorMsg = nullptr ) const override;
    QgsAbstractGeometry *symDifference( const QgsAbstractGeometry *geom, QString *errorMsg = nullptr ) const override;
    QgsAbstractGeometry *buffer( double distance, int segments, QString *errorMsg = nullptr ) const override;
    QgsAbstractGeometry *buffer( double distance, int segments, int endCapStyle, int joinStyle, double miterLimit, QString *errorMsg = nullptr ) const override;
    QgsAbstractGeometry *simplify( double tolerance, QString *errorMsg = nullptr ) const override;
    QgsAbstractGeometry *interpolate( double distance, QString *errorMsg = nullptr ) const override;
    QgsAbstractGeometry *envelope( QString *errorMsg = nullptr ) const override;
    QgsPoint *centroid( QString *errorMsg = nullptr ) const override;
    QgsPoint *pointOnSurface( QString *errorMsg = nullptr ) const override;
    QgsAbstractGeometry *convexHull( QString *errorMsg = nullptr ) const override;
    double distance( const QgsAbstractGeometry *geom, QString *errorMsg = nullptr ) const override;
 
    double hausdorffDistance( const QgsAbstractGeometry *geom, QString *errorMsg = nullptr ) const;
 
    double hausdorffDistanceDensify( const QgsAbstractGeometry *geom, double densifyFraction, QString *errorMsg = nullptr ) const;
 
    double frechetDistance( const QgsAbstractGeometry *geom, QString *errorMsg = nullptr ) const;
 
    double frechetDistanceDensify( const QgsAbstractGeometry *geom, double densifyFraction, QString *errorMsg = nullptr ) const;
 
    bool intersects( const QgsAbstractGeometry *geom, QString *errorMsg = nullptr ) const override;
    bool touches( const QgsAbstractGeometry *geom, QString *errorMsg = nullptr ) const override;
    bool crosses( const QgsAbstractGeometry *geom, QString *errorMsg = nullptr ) const override;
    bool within( const QgsAbstractGeometry *geom, QString *errorMsg = nullptr ) const override;
    bool overlaps( const QgsAbstractGeometry *geom, QString *errorMsg = nullptr ) const override;
    bool contains( const QgsAbstractGeometry *geom, QString *errorMsg = nullptr ) const override;
    bool disjoint( const QgsAbstractGeometry *geom, QString *errorMsg = nullptr ) const override;
    QString relate( const QgsAbstractGeometry *geom, QString *errorMsg = nullptr ) const override;
    bool relatePattern( const QgsAbstractGeometry *geom, const QString &pattern, QString *errorMsg = nullptr ) const override;
    double area( QString *errorMsg = nullptr ) const override;
    double length( QString *errorMsg = nullptr ) const override;
    bool isValid( QString *errorMsg = nullptr, bool allowSelfTouchingHoles = false, QgsGeometry *errorLoc = nullptr ) const override;
    bool isEqual( const QgsAbstractGeometry *geom, QString *errorMsg = nullptr ) const override;
    bool isEmpty( QString *errorMsg = nullptr ) const override;
    bool isSimple( QString *errorMsg = nullptr ) const override;
 
    EngineOperationResult splitGeometry( const QgsLineString &splitLine,
                                         QVector<QgsGeometry> &newGeometries,
                                         bool topological,
                                         QgsPointSequence &topologyTestPoints,
                                         QString *errorMsg = nullptr, bool skipIntersectionCheck = false ) const override;
 
    QgsAbstractGeometry *offsetCurve( double distance, int segments, int joinStyle, double miterLimit, QString *errorMsg = nullptr ) const override;
 
    std::unique_ptr< QgsAbstractGeometry > singleSidedBuffer( double distance, int segments, int side,
        int joinStyle, double miterLimit,
        QString *errorMsg = nullptr ) const;
 
    std::unique_ptr< QgsAbstractGeometry > maximumInscribedCircle( double tolerance, QString *errorMsg = nullptr ) const;
 
    std::unique_ptr< QgsAbstractGeometry > largestEmptyCircle( double tolerance, const QgsAbstractGeometry *boundary = nullptr, QString *errorMsg = nullptr ) const;
 
    std::unique_ptr< QgsAbstractGeometry > minimumWidth( QString *errorMsg = nullptr ) const;
 
    double minimumClearance( QString *errorMsg = nullptr ) const;
 
    std::unique_ptr< QgsAbstractGeometry > minimumClearanceLine( QString *errorMsg = nullptr ) const;
 
    std::unique_ptr< QgsAbstractGeometry > node( QString *errorMsg = nullptr ) const;
 
    std::unique_ptr< QgsAbstractGeometry > sharedPaths( const QgsAbstractGeometry *other, QString *errorMsg = nullptr ) const;
 
    std::unique_ptr< QgsAbstractGeometry > reshapeGeometry( const QgsLineString &reshapeWithLine, EngineOperationResult *errorCode, QString *errorMsg = nullptr ) const;
 
    QgsGeometry mergeLines( QString *errorMsg = nullptr ) const;
 
    QgsGeometry closestPoint( const QgsGeometry &other, QString *errorMsg = nullptr ) const;
 
    QgsGeometry shortestLine( const QgsGeometry &other, QString *errorMsg = nullptr ) const;
 
    QgsGeometry shortestLine( const QgsAbstractGeometry *other, QString *errorMsg = nullptr ) const;
 
    double lineLocatePoint( const QgsPoint &point, QString *errorMsg = nullptr ) const;
 
    static QgsGeometry polygonize( const QVector<const QgsAbstractGeometry *> &geometries, QString *errorMsg = nullptr );
 
    QgsGeometry voronoiDiagram( const QgsAbstractGeometry *extent = nullptr, double tolerance = 0.0, bool edgesOnly = false, QString *errorMsg = nullptr ) const;
 
    QgsGeometry delaunayTriangulation( double tolerance = 0.0, bool edgesOnly = false, QString *errorMsg = nullptr ) const;
 
    static std::unique_ptr< QgsAbstractGeometry > fromGeos( const GEOSGeometry *geos );
    static std::unique_ptr< QgsPolygon > fromGeosPolygon( const GEOSGeometry *geos );
 
 
    static geos::unique_ptr asGeos( const QgsGeometry &geometry, double precision = 0 );
 
    static geos::unique_ptr asGeos( const QgsAbstractGeometry *geometry, double precision = 0 );
    static QgsPoint coordSeqPoint( const GEOSCoordSequence *cs, int i, bool hasZ, bool hasM );
 
    static GEOSContextHandle_t getGEOSHandler();
 
 
  private:
    mutable geos::unique_ptr mGeos;
    geos::prepared_unique_ptr mGeosPrepared;
    double mPrecision = 0.0;
 
    enum Overlay
    {
      OverlayIntersection,
      OverlayDifference,
      OverlayUnion,
      OverlaySymDifference
    };
 
    enum Relation
    {
      RelationIntersects,
      RelationTouches,
      RelationCrosses,
      RelationWithin,
      RelationOverlaps,
      RelationContains,
      RelationDisjoint
    };
 
    //geos util functions
    void cacheGeos() const;
    std::unique_ptr< QgsAbstractGeometry > overlay( const QgsAbstractGeometry *geom, Overlay op, QString *errorMsg = nullptr ) const;
    bool relation( const QgsAbstractGeometry *geom, Relation r, QString *errorMsg = nullptr ) const;
    static GEOSCoordSequence *createCoordinateSequence( const QgsCurve *curve, double precision, bool forceClose = false );
    static std::unique_ptr< QgsLineString > sequenceToLinestring( const GEOSGeometry *geos, bool hasZ, bool hasM );
    static int numberOfGeometries( GEOSGeometry *g );
    static geos::unique_ptr nodeGeometries( const GEOSGeometry *splitLine, const GEOSGeometry *geom );
    int mergeGeometriesMultiTypeSplit( QVector<GEOSGeometry *> &splitResult ) const;
 
    static geos::unique_ptr createGeosCollection( int typeId, const QVector<GEOSGeometry *> &geoms );
 
    static geos::unique_ptr createGeosPointXY( double x, double y, bool hasZ, double z, bool hasM, double m, int coordDims, double precision );
    static geos::unique_ptr createGeosPoint( const QgsAbstractGeometry *point, int coordDims, double precision );
    static geos::unique_ptr createGeosLinestring( const QgsAbstractGeometry *curve, double precision );
    static geos::unique_ptr createGeosPolygon( const QgsAbstractGeometry *poly, double precision );
 
    //utils for geometry split
    bool topologicalTestPointsSplit( const GEOSGeometry *splitLine, QgsPointSequence &testPoints, QString *errorMsg = nullptr ) const;
    geos::unique_ptr linePointDifference( GEOSGeometry *GEOSsplitPoint ) const;
    EngineOperationResult splitLinearGeometry( GEOSGeometry *splitLine, QVector<QgsGeometry > &newGeometries, bool skipIntersectionCheck ) const;
    EngineOperationResult splitPolygonGeometry( GEOSGeometry *splitLine, QVector<QgsGeometry > &newGeometries, bool skipIntersectionCheck ) const;
 
    //utils for reshape
    static geos::unique_ptr reshapeLine( const GEOSGeometry *line, const GEOSGeometry *reshapeLineGeos, double precision );
    static geos::unique_ptr reshapePolygon( const GEOSGeometry *polygon, const GEOSGeometry *reshapeLineGeos, double precision );
    static int lineContainedInLine( const GEOSGeometry *line1, const GEOSGeometry *line2 );
    static int pointContainedInLine( const GEOSGeometry *point, const GEOSGeometry *line );
    static int geomDigits( const GEOSGeometry *geom );
    void subdivideRecursive( const GEOSGeometry *currentPart, int maxNodes, int depth, QgsGeometryCollection *parts, const QgsRectangle &clipRect ) const;
};
 
 
 
class GEOSException : public std::runtime_error
{
  public:
    explicit GEOSException( const QString &message )
      : std::runtime_error( message.toUtf8().constData() )
    {
    }
};
 
 
#endif // QGSGEOS_H