qgscoordinatetransform.h

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/***************************************************************************
               qgscoordinatetransform.h  - Coordinate Transforms
               ------------------------
    begin                : Dec 2004
    copyright            : (C) 2004 Tim Sutton
    email                : tim at linfiniti.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 QGSCOORDINATETRANSFORM_H
#define QGSCOORDINATETRANSFORM_H

#include <QExplicitlySharedDataPointer>

#include "qgsconfig.h"
#include "qgis_core.h"
#include "qgis_sip.h"
#include "qgscoordinatereferencesystem.h"
#include "qgscoordinatetransformcontext.h"

class QgsCoordinateTransformPrivate;
class QgsPointXY;
class QgsRectangle;
class QPolygonF;
class QgsProject;

class CORE_EXPORT QgsCoordinateTransform
{

  public:

    enum TransformDirection
    {
      ForwardTransform,     
      ReverseTransform      
    };

    QgsCoordinateTransform();

    Q_DECL_DEPRECATED explicit QgsCoordinateTransform( const QgsCoordinateReferenceSystem &source, const QgsCoordinateReferenceSystem &destination ) SIP_SKIP;

    explicit QgsCoordinateTransform( const QgsCoordinateReferenceSystem &source,
                                     const QgsCoordinateReferenceSystem &destination,
                                     const QgsCoordinateTransformContext &context );

    explicit QgsCoordinateTransform( const QgsCoordinateReferenceSystem &source,
                                     const QgsCoordinateReferenceSystem &destination,
                                     const QgsProject *project );

    explicit QgsCoordinateTransform( const QgsCoordinateReferenceSystem &source,
                                     const QgsCoordinateReferenceSystem &destination,
                                     int sourceDatumTransformId,
                                     int destinationDatumTransformId );

    QgsCoordinateTransform( const QgsCoordinateTransform &o );

    QgsCoordinateTransform &operator=( const QgsCoordinateTransform &o );

    ~QgsCoordinateTransform();

    bool isValid() const;

    void setSourceCrs( const QgsCoordinateReferenceSystem &crs );

    void setDestinationCrs( const QgsCoordinateReferenceSystem &crs );

    void setContext( const QgsCoordinateTransformContext &context );

    QgsCoordinateReferenceSystem sourceCrs() const;

    QgsCoordinateReferenceSystem destinationCrs() const;

    QgsPointXY transform( const QgsPointXY &point, TransformDirection direction = ForwardTransform ) const;

    QgsPointXY transform( const double x, const double y, TransformDirection direction = ForwardTransform ) const;

    QgsRectangle transformBoundingBox( const QgsRectangle &rectangle, TransformDirection direction = ForwardTransform, const bool handle180Crossover = false ) const;

    void transformInPlace( double &x, double &y, double &z, TransformDirection direction = ForwardTransform ) const;

    void transformInPlace( float &x, float &y, double &z, TransformDirection direction = ForwardTransform ) const SIP_SKIP;

    void transformInPlace( float &x, float &y, float &z, TransformDirection direction = ForwardTransform ) const SIP_SKIP;

    void transformInPlace( QVector<float> &x, QVector<float> &y, QVector<float> &z,
                           TransformDirection direction = ForwardTransform ) const SIP_SKIP;

    void transformInPlace( QVector<double> &x, QVector<double> &y, QVector<double> &z,
                           TransformDirection direction = ForwardTransform ) const SIP_SKIP;

    void transformPolygon( QPolygonF &polygon, TransformDirection direction = ForwardTransform ) const;

    QgsRectangle transform( const QgsRectangle &rectangle, TransformDirection direction = ForwardTransform ) const;

    void transformCoords( int numPoint, double *x, double *y, double *z, TransformDirection direction = ForwardTransform ) const;

    bool isShortCircuited() const;

    int sourceDatumTransformId() const;

    void setSourceDatumTransformId( int datumId );

    int destinationDatumTransformId() const;

    void setDestinationDatumTransformId( int datumId );

    static void invalidateCache();

  private:

    mutable QExplicitlySharedDataPointer<QgsCoordinateTransformPrivate> d;

    QgsCoordinateTransformContext mContext;

#ifdef QGISDEBUG
    bool mHasContext = false;
#endif

    bool setFromCache( const QgsCoordinateReferenceSystem &src,
                       const QgsCoordinateReferenceSystem &dest,
                       int srcDatumTransform,
                       int destDatumTransform );
    void addToCache();

    // cache
    static QReadWriteLock sCacheLock;
    static QMultiHash< QPair< QString, QString >, QgsCoordinateTransform > sTransforms; //same auth_id pairs might have different datum transformations

};

#ifndef SIP_RUN
inline std::ostream &operator << ( std::ostream &os, const QgsCoordinateTransform &r )
{
  QString mySummary( QStringLiteral( "\n%%%%%%%%%%%%%%%%%%%%%%%%\nCoordinate Transform def begins:" ) );
  mySummary += QLatin1String( "\n\tInitialized? : " );
  //prevent warnings
  if ( r.isValid() )
  {
    //do nothing this is a dummy
  }

#if 0
  if ( r.isValid() )
  {
    mySummary += "Yes";
  }
  else
  {
    mySummary += "No";
  }
  mySummary += "\n\tShort Circuit?  : ";
  if ( r.isShortCircuited() )
  {
    mySummary += "Yes";
  }
  else
  {
    mySummary += "No";
  }

  mySummary += "\n\tSource Spatial Ref Sys  : ";
  if ( r.sourceCrs() )
  {
    mySummary << r.sourceCrs();
  }
  else
  {
    mySummary += "Undefined";
  }

  mySummary += "\n\tDest Spatial Ref Sys  : ";
  if ( r.destCRS() )
  {
    mySummary << r.destCRS();
  }
  else
  {
    mySummary += "Undefined";
  }
#endif

  mySummary += QLatin1String( "\nCoordinate Transform def ends \n%%%%%%%%%%%%%%%%%%%%%%%%\n" );
  return os << mySummary.toLocal8Bit().data() << std::endl;
}
#endif


#endif // QGSCOORDINATETRANSFORM_H