qgscoordinatereferencesystem.h

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/***************************************************************************
                             qgscoordinatereferencesystem.h
 
                             -------------------
    begin                : 2007
    copyright            : (C) 2007 by Gary E. Sherman
    email                : [email protected]
***************************************************************************/
 
/***************************************************************************
 *                                                                         *
 *   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 QGSCOORDINATEREFERENCESYSTEM_H
#define QGSCOORDINATEREFERENCESYSTEM_H
 
//Standard includes
#include "qgis_core.h"
#include <ostream>
 
//qt includes
#include <QString>
#include <QMap>
#include <QHash>
#include <QReadWriteLock>
#include <QExplicitlySharedDataPointer>
#include <QObject>
 
//qgis includes
#include "qgis_sip.h"
#include "qgsunittypes.h"
#include "qgsrectangle.h"
#include "qgssqliteutils.h"
 
class QDomNode;
class QDomDocument;
class QgsCoordinateReferenceSystemPrivate;
 
#if PROJ_VERSION_MAJOR>=6
#ifndef SIP_RUN
struct PJconsts;
typedef struct PJconsts PJ;
 
struct projCtx_t;
typedef struct projCtx_t PJ_CONTEXT;
 
#endif
#endif
 
// forward declaration for sqlite3
typedef struct sqlite3 sqlite3 SIP_SKIP;
 
#ifdef DEBUG
typedef struct OGRSpatialReferenceHS *OGRSpatialReferenceH SIP_SKIP;
#else
typedef void *OGRSpatialReferenceH SIP_SKIP;
#endif
 
class QgsCoordinateReferenceSystem;
typedef void ( *CUSTOM_CRS_VALIDATION )( QgsCoordinateReferenceSystem & ) SIP_SKIP;
 
class CORE_EXPORT QgsCoordinateReferenceSystem
{
    Q_GADGET
 
    Q_PROPERTY( QgsUnitTypes::DistanceUnit mapUnits READ mapUnits )
    Q_PROPERTY( bool isGeographic READ isGeographic )
 
  public:
 
    enum CrsType
    {
      InternalCrsId,  
      PostgisCrsId,   
      EpsgCrsId       
    };
 
    enum Format
    {
      FormatWkt = 0, 
      FormatProj, 
    };
 
    QgsCoordinateReferenceSystem();
 
    ~QgsCoordinateReferenceSystem();
 
    // TODO QGIS 4: remove "POSTGIS" and "INTERNAL"
 
    explicit QgsCoordinateReferenceSystem( const QString &definition );
 
    // TODO QGIS 4: remove type and always use EPSG code
 
    Q_DECL_DEPRECATED explicit QgsCoordinateReferenceSystem( long id, CrsType type = PostgisCrsId ) SIP_DEPRECATED;
 
    QgsCoordinateReferenceSystem( const QgsCoordinateReferenceSystem &srs );
 
    QgsCoordinateReferenceSystem &operator=( const QgsCoordinateReferenceSystem &srs );
 
    operator QVariant() const
    {
      return QVariant::fromValue( *this );
    }
 
    static QList< long > validSrsIds();
 
    // static creators
 
    static QgsCoordinateReferenceSystem fromOgcWmsCrs( const QString &ogcCrs );
 
    Q_INVOKABLE static QgsCoordinateReferenceSystem fromEpsgId( long epsg );
 
    Q_DECL_DEPRECATED static QgsCoordinateReferenceSystem fromProj4( const QString &proj4 ) SIP_DEPRECATED;
 
    static QgsCoordinateReferenceSystem fromProj( const QString &proj );
 
    static QgsCoordinateReferenceSystem fromWkt( const QString &wkt );
 
    static QgsCoordinateReferenceSystem fromSrsId( long srsId );
 
    // Misc helper functions -----------------------
 
    // TODO QGIS 4: remove type and always use EPSG code, rename to createFromEpsg
 
    Q_DECL_DEPRECATED bool createFromId( long id, CrsType type = PostgisCrsId ) SIP_DEPRECATED;
 
    // TODO QGIS 4: remove "QGIS" and "CUSTOM", only support "USER" (also returned by authid())
 
    bool createFromOgcWmsCrs( const QString &crs );
 
    // TODO QGIS 4: remove unless really necessary - let's use EPSG codes instead
 
    Q_DECL_DEPRECATED bool createFromSrid( long srid ) SIP_DEPRECATED;
 
    bool createFromWkt( const QString &wkt );
 
    bool createFromSrsId( long srsId );
 
    Q_DECL_DEPRECATED bool createFromProj4( const QString &projString ) SIP_DEPRECATED;
 
#ifndef SIP_RUN
    bool createFromProj( const QString &projString, bool identify = true );
#else
    bool createFromProj( const QString &projString );
#endif
 
    bool createFromString( const QString &definition );
    // TODO QGIS3: rename to createFromStringOGR so it is clear it's similar to createFromString, just different backend
    bool createFromUserInput( const QString &definition );
 
    Q_DECL_DEPRECATED static void setupESRIWktFix() SIP_DEPRECATED;
 
    bool isValid() const;
 
    void validate();
 
    // TODO QGIS 4: seems completely obsolete now (only compares proj4 - already done in createFromProj4)
 
    Q_DECL_DEPRECATED long findMatchingProj() SIP_DEPRECATED;
 
    bool operator==( const QgsCoordinateReferenceSystem &srs ) const;
 
    bool operator!=( const QgsCoordinateReferenceSystem &srs ) const;
 
    bool readXml( const QDomNode &node );
 
    bool writeXml( QDomNode &node, QDomDocument &doc ) const;
 
 
    static void setCustomCrsValidation( CUSTOM_CRS_VALIDATION f ) SIP_SKIP;
 
    static CUSTOM_CRS_VALIDATION customCrsValidation() SIP_SKIP;
 
    // Accessors -----------------------------------
 
    long srsid() const;
 
    // TODO QGIS 4: remove unless really necessary - let's use EPSG codes instead
 
    long postgisSrid() const;
 
    QString authid() const;
 
    QString description() const;
 
    enum IdentifierType
    {
      ShortString, 
      MediumString, 
      FullString, 
    };
 
    QString userFriendlyIdentifier( IdentifierType type = MediumString ) const;
 
    QString projectionAcronym() const;
 
    QString ellipsoidAcronym() const;
 
    enum WktVariant
    {
      WKT1_GDAL, 
      WKT1_ESRI, 
      WKT2_2015, 
      WKT2_2015_SIMPLIFIED, 
      WKT2_2018, 
      WKT2_2018_SIMPLIFIED, 
      WKT2_2019 = WKT2_2018, 
      WKT2_2019_SIMPLIFIED = WKT2_2018_SIMPLIFIED, 
 
      WKT_PREFERRED = WKT2_2019, 
      WKT_PREFERRED_SIMPLIFIED = WKT2_2019_SIMPLIFIED, 
      WKT_PREFERRED_GDAL = WKT2_2019, 
    };
 
    QString toWkt( WktVariant variant = WKT1_GDAL, bool multiline = false, int indentationWidth = 4 ) const;
 
    Q_DECL_DEPRECATED QString toProj4() const SIP_DEPRECATED;
 
    QString toProj() const;
 
    bool isGeographic() const;
 
    bool hasAxisInverted() const;
 
    QgsUnitTypes::DistanceUnit mapUnits() const;
 
    QgsRectangle bounds() const;
 
    // Mutators -----------------------------------
 
    void setValidationHint( const QString &html );
 
    QString validationHint();
 
    static int syncDatabase();
 
    long saveAsUserCrs( const QString &name, Format nativeFormat = FormatWkt );
 
    QString geographicCrsAuthId() const;
 
#ifdef SIP_RUN
    SIP_PYOBJECT __repr__();
    % MethodCode
    QString str = QStringLiteral( "<QgsCoordinateReferenceSystem: %1>" ).arg( sipCpp->authid() );
    sipRes = PyUnicode_FromString( str.toUtf8().constData() );
    % End
#endif
 
#ifndef SIP_RUN
#if PROJ_VERSION_MAJOR>=6
 
    PJ *projObject() const;
#endif
#endif
 
    Q_DECL_DEPRECATED static QStringList recentProjections() SIP_DEPRECATED;
 
    static QList< QgsCoordinateReferenceSystem > recentCoordinateReferenceSystems();
 
    static void pushRecentCoordinateReferenceSystem( const QgsCoordinateReferenceSystem &crs );
 
#ifndef SIP_RUN
 
    static void invalidateCache( bool disableCache = false );
#else
 
    static void invalidateCache( bool disableCache SIP_PYARGREMOVE = false );
#endif
 
    // Mutators -----------------------------------
    // We don't want to expose these to the public api since they won't create
    // a fully valid crs. Programmers should use the createFrom* methods rather
  private:
 
    static QString projFromSrsId( int srsId );
 
    void setProjString( const QString &projString );
 
    bool setWktString( const QString &wkt, bool allowProjFallback = true );
 
    void debugPrint();
 
    typedef QMap<QString, QString> RecordMap;
 
    RecordMap getRecord( const QString &sql );
 
    static int openDatabase( const QString &path, sqlite3_database_unique_ptr &database, bool readonly = true );
 
    void setMapUnits();
 
    long getRecordCount();
 
#if PROJ_VERSION_MAJOR>=6
    bool loadFromAuthCode( const QString &auth, const QString &code );
 
    static QList< long > userSrsIds();
 
    long matchToUserCrs() const;
#endif
 
    bool loadFromDatabase( const QString &db, const QString &expression, const QString &value );
 
#if PROJ_VERSION_MAJOR<6 // not used for proj >= 6.0
    static bool loadIds( QHash<int, QString> &wkts );
    static bool loadWkts( QHash<int, QString> &wkts, const char *filename );
 
    static bool syncDatumTransform( const QString &dbPath );
#endif
 
    QExplicitlySharedDataPointer<QgsCoordinateReferenceSystemPrivate> d;
 
    QString mValidationHint;
 
#if PROJ_VERSION_MAJOR>=6
    friend class QgsProjContext;
 
    // Only meant to be called by QgsProjContext::~QgsProjContext()
    static void removeFromCacheObjectsBelongingToCurrentThread( PJ_CONTEXT *pj_context );
#endif
 
    static CUSTOM_CRS_VALIDATION sCustomSrsValidation;
 
    // cache
 
    static bool sDisableSrIdCache;
    static bool sDisableOgcCache;
    static bool sDisableProjCache;
    static bool sDisableWktCache;
    static bool sDisableSrsIdCache;
    static bool sDisableStringCache;
 
    // for tests
    static const QHash< QString, QgsCoordinateReferenceSystem > &stringCache();
    static const QHash< QString, QgsCoordinateReferenceSystem > &projCache();
    static const QHash< QString, QgsCoordinateReferenceSystem > &ogcCache();
    static const QHash< QString, QgsCoordinateReferenceSystem > &wktCache();
    static const QHash< long, QgsCoordinateReferenceSystem > &srsIdCache();
    static const QHash< long, QgsCoordinateReferenceSystem > &srIdCache();
 
    friend class TestQgsCoordinateReferenceSystem;
    friend class QgsPostgresProvider;
 
    bool createFromPostgisSrid( const long id );
};
 
Q_DECLARE_METATYPE( QgsCoordinateReferenceSystem )
 
#ifndef SIP_RUN
inline std::ostream &operator << ( std::ostream &os, const QgsCoordinateReferenceSystem &r )
{
  QString mySummary( QStringLiteral( "\n\tSpatial Reference System:" ) );
  mySummary += QLatin1String( "\n\t\tDescription : " );
  if ( !r.description().isNull() )
  {
    mySummary += r.description();
  }
  else
  {
    mySummary += QLatin1String( "Undefined" );
  }
  mySummary += QLatin1String( "\n\t\tProjection  : " );
  if ( !r.projectionAcronym().isNull() )
  {
    mySummary += r.projectionAcronym();
  }
  else
  {
    mySummary += QLatin1String( "Undefined" );
  }
 
  mySummary += QLatin1String( "\n\t\tEllipsoid   : " );
  if ( !r.ellipsoidAcronym().isNull() )
  {
    mySummary += r.ellipsoidAcronym();
  }
  else
  {
    mySummary += QLatin1String( "Undefined" );
  }
 
  mySummary += QLatin1String( "\n\t\tProjString  : " );
  if ( !r.toProj().isNull() )
  {
    mySummary += r.toProj();
  }
  else
  {
    mySummary += QLatin1String( "Undefined" );
  }
  // Using streams we need to use local 8 Bit
  return os << mySummary.toLocal8Bit().data() << std::endl;
}
#endif
 
#endif // QGSCOORDINATEREFERENCESYSTEM_H