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qgscoordinatetransformcontext.cpp
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qgscoordinatetransformcontext.cpp
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/***************************************************************************
qgscoordinatetransformcontext.cpp
---------------------------------
begin : November 2017
copyright : (C) 2017 by Nyall Dawson
email : nyall dot dawson 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. *
* *
***************************************************************************/
#include "qgscoordinatetransformcontext.h"
#include "qgscoordinatetransformcontext_p.h"
QgsCoordinateTransformContext::QgsCoordinateTransformContext()
: d( new QgsCoordinateTransformContextPrivate() )
{}
QgsCoordinateTransformContext::QgsCoordinateTransformContext( const QgsCoordinateTransformContext &rhs ) //NOLINT
: d( rhs.d )
{}
QgsCoordinateTransformContext &QgsCoordinateTransformContext::operator=( const QgsCoordinateTransformContext &rhs ) //NOLINT
{
d = rhs.d;
return *this;
}
void QgsCoordinateTransformContext::clear()
{
d.detach();
// play it safe
d->mLock.lockForWrite();
d->mSourceDestDatumTransforms.clear();
d->mSourceDatumTransforms.clear();
d->mDestDatumTransforms.clear();
d->mLock.unlock();
}
QMap<QString, int> QgsCoordinateTransformContext::sourceDatumTransforms() const
{
d->mLock.lockForRead();
auto res = d->mSourceDatumTransforms;
res.detach();
d->mLock.unlock();
return res;
}
bool QgsCoordinateTransformContext::addSourceDatumTransform( const QgsCoordinateReferenceSystem &crs, int transform )
{
if ( !crs.isValid() )
return false;
d.detach();
d->mLock.lockForWrite();
if ( transform == -1 )
{
d->mSourceDatumTransforms.remove( crs.authid() );
}
else
{
d->mSourceDatumTransforms.insert( crs.authid(), transform );
}
d->mLock.unlock();
return true;
}
QMap<QString, int> QgsCoordinateTransformContext::destinationDatumTransforms() const
{
d->mLock.lockForRead();
auto res = d->mDestDatumTransforms;
res.detach();
d->mLock.unlock();
return res;
}
bool QgsCoordinateTransformContext::addDestinationDatumTransform( const QgsCoordinateReferenceSystem &crs, int transform )
{
if ( !crs.isValid() )
return false;
d.detach();
d->mLock.lockForWrite();
if ( transform == -1 )
{
d->mDestDatumTransforms.remove( crs.authid() );
}
else
{
d->mDestDatumTransforms.insert( crs.authid(), transform );
}
d->mLock.unlock();
return true;
}
QMap<QPair<QString, QString>, QPair<int, int> > QgsCoordinateTransformContext::sourceDestinationDatumTransforms() const
{
d->mLock.lockForRead();
auto res = d->mSourceDestDatumTransforms;
res.detach();
d->mLock.unlock();
return res;
}
bool QgsCoordinateTransformContext::addSourceDestinationDatumTransform( const QgsCoordinateReferenceSystem &sourceCrs, const QgsCoordinateReferenceSystem &destinationCrs, int sourceTransform, int destinationTransform )
{
if ( !sourceCrs.isValid() || !destinationCrs.isValid() )
return false;
d.detach();
d->mLock.lockForWrite();
if ( sourceTransform == -1 || destinationTransform == -1 )
{
d->mSourceDestDatumTransforms.remove( qMakePair( sourceCrs.authid(), destinationCrs.authid() ) );
}
else
{
d->mSourceDestDatumTransforms.insert( qMakePair( sourceCrs.authid(), destinationCrs.authid() ), qMakePair( sourceTransform, destinationTransform ) );
}
d->mLock.unlock();
return true;
}
QPair<int, int> QgsCoordinateTransformContext::calculateDatumTransforms( const QgsCoordinateReferenceSystem &source, const QgsCoordinateReferenceSystem &destination ) const
{
QString srcKey = source.authid();
QString destKey = destination.authid();
d->mLock.lockForRead();
// highest priority is exact match for source/dest pair
QPair< int, int > res = d->mSourceDestDatumTransforms.value( qMakePair( srcKey, destKey ), qMakePair( -1, -1 ) );
if ( res.first != -1 && res.second != -1 )
{
d->mLock.unlock();
return res;
}
// fallback to checking src and dest separately
int srcTransform = d->mSourceDatumTransforms.value( srcKey, -1 );
int destTransform = d->mDestDatumTransforms.value( destKey, -1 );
d->mLock.unlock();
return qMakePair( srcTransform, destTransform );
}