sharpetronics/QGIS
1
0
Fork 0
mirror of https://github.com/qgis/QGIS.git synced 2025-03-12 00:02:25 -04:00
Code Issues Packages Projects Releases Wiki Activity

move QgsDistanceArea initialization to prepareAlgorithm

Browse Source
This commit is contained in:
Alexander Bruy 2019-12-10 08:51:48 +02:00
parent 3910d7774b
commit a5c9c72e26
2 changed files with 8 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
src/analysis/processing/qgsalgorithmsumlinelength.cpp
View File

@ -127,6 +127,12 @@ bool QgsSumLineLengthAlgorithm::prepareAlgorithm( const QVariantMap &parameters,
if ( mLinesSource->hasSpatialIndex() == QgsFeatureSource::SpatialIndexNotPresent )
feedback->reportError( QObject::tr( "No spatial index exists for lines layer, performance will be severely degraded" ) );
if ( context.project() )
{
mDa.setEllipsoid( context.project()->ellipsoid() );
}
mDa.setSourceCrs( mCrs, context.transformContext() );
return true;
}
@ -170,10 +176,6 @@ QgsFeatureList QgsSumLineLengthAlgorithm::processFeature( const QgsFeature &feat
std::unique_ptr< QgsGeometryEngine > engine( QgsGeometry::createGeometryEngine( polyGeom.constGet() ) );
engine->prepareGeometry();
QgsDistanceArea da;
da.setSourceCrs( mCrs, context.transformContext() );
da.setEllipsoid( context.project()->ellipsoid() );
QgsFeatureRequest req = QgsFeatureRequest().setFilterRect( polyGeom.boundingBox() ).setDestinationCrs( mCrs, context.transformContext() );
req.setSubsetOfAttributes( QList< int >() );
QgsFeatureIterator it = mLinesSource->getFeatures( req );
@ -190,7 +192,7 @@ QgsFeatureList QgsSumLineLengthAlgorithm::processFeature( const QgsFeature &feat
if ( engine->intersects( lineFeature.geometry().constGet() ) )
{
QgsGeometry outGeom = polyGeom.intersection( lineFeature.geometry() );
length += da.measureLength( outGeom );
length += mDa.measureLength( outGeom );
count++;
}
}

1
src/analysis/processing/qgsalgorithmsumlinelength.h
View File

@ -65,6 +65,7 @@ class QgsSumLineLengthAlgorithm : public QgsProcessingFeatureBasedAlgorithm
mutable int mCountFieldIndex = -1;
mutable QgsFields mFields;
mutable QgsCoordinateReferenceSystem mCrs;
mutable QgsDistanceArea mDa;
std::unique_ptr< QgsProcessingFeatureSource > mLinesSource;
};