src/core/qgscoordinatereferencesystem.h

Go to the documentation of this file.

/***************************************************************************
                             qgscoordinatereferencesystem.h

                             -------------------
    begin                : 2007
    copyright            : (C) 2007 by Gary E. Sherman
    email                : sherman@mrcc.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 QGSCOORDINATEREFERENCESYSTEM_H
#define QGSCOORDINATEREFERENCESYSTEM_H

//Standard includes
#include <ostream>

//qt includes
#include <QString>
#include <QMap>
class QDomNode;
class QDomDocument;

// forward declaration for sqlite3
typedef struct sqlite3 sqlite3;

//qgis includes
#include "qgis.h"

class QgsCoordinateReferenceSystem;
typedef void ( *CUSTOM_CRS_VALIDATION )( QgsCoordinateReferenceSystem* );


class CORE_EXPORT QgsCoordinateReferenceSystem
{
  public:

    enum CrsType
    {
      InternalCrsId,
      PostgisCrsId,
      EpsgCrsId  // deprecated
    };

    QgsCoordinateReferenceSystem();

    ~QgsCoordinateReferenceSystem();

    explicit QgsCoordinateReferenceSystem( QString theDefinition );

    QgsCoordinateReferenceSystem( const long theId, CrsType theType = PostgisCrsId );

    QgsCoordinateReferenceSystem( const QgsCoordinateReferenceSystem& srs );

    QgsCoordinateReferenceSystem& operator=( const QgsCoordinateReferenceSystem& srs );

    // Misc helper functions -----------------------

    bool createFromId( const long theId, CrsType theType = PostgisCrsId );

    bool createFromOgcWmsCrs( QString theCrs );

    bool createFromSrid( const long theSrid );

    bool createFromWkt( const QString theWkt );

    Q_DECL_DEPRECATED bool createFromEpsg( const long theEpsg );

    bool createFromSrsId( const long theSrsId );

    bool createFromProj4( const QString theProjString );

    bool createFromString( const QString theDefinition );

    bool isValid() const;

    void validate();

    long findMatchingProj();

    bool operator==( const QgsCoordinateReferenceSystem &theSrs ) const;
    bool operator!=( const QgsCoordinateReferenceSystem &theSrs ) const;
    Q_DECL_DEPRECATED bool equals( QString theProj4String );

    bool readXML( QDomNode & theNode );
    bool writeXML( QDomNode & theNode, QDomDocument & theDoc ) const;


    static void setCustomSrsValidation( CUSTOM_CRS_VALIDATION f );

    static CUSTOM_CRS_VALIDATION customSrsValidation();

    // Accessors -----------------------------------

    long srsid() const;

    long postgisSrid() const;

    Q_DECL_DEPRECATED long epsg() const;

    QString authid() const;

    QString description() const;

    QString projectionAcronym() const;

    QString ellipsoidAcronym() const;

    QString toWkt() const;

    QString toProj4() const;

    bool geographicFlag() const;

    bool axisInverted() const;

    QGis::UnitType mapUnits() const;


    // Mutators -----------------------------------
    void setValidationHint( QString html );

    QString validationHint();
    static int syncDb();

    // Mutators -----------------------------------
    // We don't want to expose these to the public api since they wont create
    // a fully valid crs. Programmers should use the createFrom* methods rather
  private:
    static QString proj4FromSrsId( const int theSrsId );

    void setInternalId( long theSrsId );
    void setSrid( long theSrid );
    void setDescription( QString theDescription );
    /* Set the Proj Proj4String.
     * @param  QString theProj4String Proj4 format specifies
     * (excluding proj and ellips) that define this srs.
     * @note some content of the PROJ4 string may be stripped off by this
     * method due to the parsing of the string by OSRNewSpatialReference .
     * For example input:
     * +proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs
     * Gets stored in the CRS as:
     * +proj=longlat +datum=WGS84 +no_defs
     */
    void setProj4String( QString theProj4String );
    void setGeographicFlag( bool theGeoFlag );

    void setEpsg( long theEpsg );

    void setAuthId( QString theID );
    void setProjectionAcronym( QString theProjectionAcronym );
    void setEllipsoidAcronym( QString theEllipsoidAcronym );

    void debugPrint();

    typedef QMap<QString, QString> RecordMap;
    RecordMap getRecord( QString theSql );

    // Open SQLite db and show message if cannot be opened
    // returns the same code as sqlite3_open
    static int openDb( QString path, sqlite3 **db, bool readonly = true );

    long    mSrsId;
    QString mDescription;
    QString mProjectionAcronym ;
    QString mEllipsoidAcronym;
    bool    mGeoFlag;
    QGis::UnitType mMapUnits;
    long    mSRID;
    QString mAuthId;
    bool mIsValidFlag;

    void setMapUnits();

    bool saveAsUserCRS();

    long getRecordCount();

    static QString quotedValue( QString value );

    void *mCRS;

    bool loadFromDb( QString db, QString expression, QString value );

    QString mValidationHint;
    mutable QString mWkt;

    mutable int mAxisInverted;

    static CUSTOM_CRS_VALIDATION mCustomSrsValidation;
};


inline std::ostream& operator << ( std::ostream& os, const QgsCoordinateReferenceSystem &r )
{
  QString mySummary( "\n\tSpatial Reference System:" );
  mySummary += "\n\t\tDescription : ";
  if ( !r.description().isNull() )
  {
    mySummary += r.description();
  }
  else
  {
    mySummary += "Undefined" ;
  }
  mySummary += "\n\t\tProjection  : " ;
  if ( !r.projectionAcronym().isNull() )
  {
    mySummary += r.projectionAcronym();
  }
  else
  {
    mySummary += "Undefined" ;
  }

  mySummary += "\n\t\tEllipsoid   : ";
  if ( !r.ellipsoidAcronym().isNull() )
  {
    mySummary += r.ellipsoidAcronym();
  }
  else
  {
    mySummary += "Undefined" ;
  }

  mySummary += "\n\t\tProj4String  : " ;
  if ( !r.toProj4().isNull() )
  {
    mySummary += r.toProj4();
  }
  else
  {
    mySummary += "Undefined" ;
  }
  // Using streams we need to use local 8 Bit
  return os << mySummary.toLocal8Bit().data() << std::endl;
}

#endif // QGSCOORDINATEREFERENCESYSTEM_H

---