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qgsdatumtransformstore.h
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qgsdatumtransformstore.h
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/***************************************************************************
qgsdatumtransformstore.h
---------------------
begin : June 2014
copyright : (C) 2014 by Martin Dobias
email : wonder dot sk at gmail 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 QGSDATUMTRANSFORMSTORE_H
#define QGSDATUMTRANSFORMSTORE_H
#include "qgis_core.h"
#include "qgscoordinatereferencesystem.h"
class QgsCoordinateTransform;
class QgsMapLayer;
class QDomElement;
/**
* \ingroup core
* \brief The QgsDatumTransformStore class keeps track of datum transformations
* as chosen by the user.
*
* \since QGIS 2.4
*/
class CORE_EXPORT QgsDatumTransformStore
{
public:
explicit QgsDatumTransformStore( const QgsCoordinateReferenceSystem &destCrs );
void clear();
void setDestinationCrs( const QgsCoordinateReferenceSystem &destCrs );
void addEntry( const QString &layerId, const QString &srcAuthId, const QString &destAuthId, int srcDatumTransform, int destDatumTransform );
bool hasEntryForLayer( QgsMapLayer *layer ) const;
/**
* Will return transform from layer's CRS to current destination CRS.
* \returns transformation associated with layer, or an invalid QgsCoordinateTransform
* if no transform is associated with the layer
* \param layer the associated layer
* \param srcAuthId source CRS (defaults to layer crs)
* \param dstAuthId destination CRS (defaults to store's crs)
*/
QgsCoordinateTransform transformation( const QgsMapLayer *layer, QString srcAuthId = QString(), QString dstAuthId = QString() ) const;
void readXml( const QDomNode &parentNode );
void writeXml( QDomNode &parentNode, QDomDocument &doc ) const;
struct CORE_EXPORT Entry
{
QString srcAuthId;
QString destAuthId;
int srcDatumTransform; //-1 if unknown or not specified
int destDatumTransform;
};
protected:
QgsCoordinateReferenceSystem mDestCRS;
//! key = layer ID
QHash< QString, Entry > mEntries;
};
#endif // QGSDATUMTRANSFORMSTORE_H