QgsCoordinateTransform QgsCoordinateTransformCache::transform( const QString& srcAuthId, const QString& destAuthId, int srcDatumTransform, int destDatumTransform )
{
QList< QgsCoordinateTransform > values =
mTransforms.values( qMakePair( srcAuthId, destAuthId ) );
QList< QgsCoordinateTransform >::const_iterator valIt = values.constBegin();
for ( ; valIt != values.constEnd(); ++valIt )
{
if (( *valIt ).isValid() &&
( *valIt ).sourceDatumTransform() == srcDatumTransform &&
( *valIt ).destinationDatumTransform() == destDatumTransform )
{
return *valIt;
}
}
//not found, insert new value
QgsCoordinateReferenceSystem srcCrs = QgsCoordinateReferenceSystem::fromOgcWmsCrs( srcAuthId );
QgsCoordinateReferenceSystem destCrs = QgsCoordinateReferenceSystem::fromOgcWmsCrs( destAuthId );
QgsCoordinateTransform ct = QgsCoordinateTransform( srcCrs, destCrs );
ct.setSourceDatumTransform( srcDatumTransform );
ct.setDestinationDatumTransform( destDatumTransform );
ct.initialise();
mTransforms.insertMulti( qMakePair( srcAuthId, destAuthId ), ct );
return ct;
}
QgsCoordinateTransform* QgsCoordinateTransform::clone() const
{
QgsCoordinateTransform* tr = new QgsCoordinateTransform( sourceCrs(), destCRS() );
tr->setSourceDatumTransform( sourceDatumTransform() );
tr->setDestinationDatumTransform( destinationDatumTransform() );
tr->initialise();
return tr;
}
