void QgsMapSettings::writeXML( QDomNode& theNode, QDomDocument& theDoc )
{
// units
theNode.appendChild( QgsXmlUtils::writeMapUnits( mapUnits(), theDoc ) );
// Write current view extents
theNode.appendChild( QgsXmlUtils::writeRectangle( extent(), theDoc ) );
// Write current view rotation
QDomElement rotNode = theDoc.createElement( "rotation" );
rotNode.appendChild(
theDoc.createTextNode( qgsDoubleToString( rotation() ) )
);
theNode.appendChild( rotNode );
// projections enabled
QDomElement projNode = theDoc.createElement( "projections" );
projNode.appendChild( theDoc.createTextNode( QString::number( hasCrsTransformEnabled() ) ) );
theNode.appendChild( projNode );
// destination CRS
QDomElement srsNode = theDoc.createElement( "destinationsrs" );
theNode.appendChild( srsNode );
destinationCrs().writeXML( srsNode, theDoc );
//render map tile
QDomElement renderMapTileElem = theDoc.createElement( "rendermaptile" );
QDomText renderMapTileText = theDoc.createTextNode( testFlag( QgsMapSettings::RenderMapTile ) ? "1" : "0" );
renderMapTileElem.appendChild( renderMapTileText );
theNode.appendChild( renderMapTileElem );
mDatumTransformStore.writeXML( theNode, theDoc );
}
QgsRectangle QgsMapSettings::computeExtentForScale( const QgsPointXY &point, double scale, const QgsCoordinateReferenceSystem &sourceCrs ) const
{
QgsPointXY center = QgsCoordinateTransform( sourceCrs, destinationCrs(), mTransformContext ).transform( point );
// Output width in inches
double outWIn = outputSize().width() / double( outputDpi() );
// Desired visible width (honouring scale)
double scaledWIn = outWIn * scale;
if ( mapUnits() == QgsUnitTypes::DistanceDegrees )
{
// Start with an 1x1 extent around the center
QgsRectangle ext( center.x() - 0.5, center.y() - 0.5, center.x() + 0.5, center.y() + 0.5 );
// Get scale at extent, and then scale extent to the desired scale
double testScale = mScaleCalculator.calculate( ext, outputSize().width() );
ext.scale( scale / testScale );
return ext;
}
// Conversion from inches to mapUnits
double conversionFactor = 12 * QgsUnitTypes::fromUnitToUnitFactor( QgsUnitTypes::DistanceFeet, mapUnits() );
double delta = 0.5 * scaledWIn * conversionFactor;
return QgsRectangle( center.x() - delta, center.y() - delta, center.x() + delta, center.y() + delta );
}
QgsPointLocator *QgsSnappingUtils::temporaryLocatorForLayer( QgsVectorLayer *vl, const QgsPointXY &pointMap, double tolerance )
{
if ( mTemporaryLocators.contains( vl ) )
delete mTemporaryLocators.take( vl );
QgsRectangle rect( pointMap.x() - tolerance, pointMap.y() - tolerance,
pointMap.x() + tolerance, pointMap.y() + tolerance );
QgsPointLocator *vlpl = new QgsPointLocator( vl, destinationCrs(), mMapSettings.transformContext(), &rect );
mTemporaryLocators.insert( vl, vlpl );
return mTemporaryLocators.value( vl );
}
QgsPointLocator *QgsSnappingUtils::locatorForLayer( QgsVectorLayer *vl )
{
if ( !vl )
return nullptr;
if ( !mLocators.contains( vl ) )
{
QgsPointLocator *vlpl = new QgsPointLocator( vl, destinationCrs(), mMapSettings.transformContext() );
mLocators.insert( vl, vlpl );
}
return mLocators.value( vl );
}
