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qgsalgorithmmultiparttosinglepart.cpp
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qgsalgorithmmultiparttosinglepart.cpp
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/***************************************************************************
qgsalgorithmmultiparttosinglepart.cpp
---------------------
begin : April 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 "qgsalgorithmmultiparttosinglepart.h"
#include "qgsvectorlayer.h"
///@cond PRIVATE
QString QgsMultipartToSinglepartAlgorithm::name() const
{
return QStringLiteral( "multiparttosingleparts" );
}
QString QgsMultipartToSinglepartAlgorithm::displayName() const
{
return QObject::tr( "Multipart to singleparts" );
}
QString QgsMultipartToSinglepartAlgorithm::outputName() const
{
return QObject::tr( "Single parts" );
}
QgsWkbTypes::Type QgsMultipartToSinglepartAlgorithm::outputWkbType( QgsWkbTypes::Type inputWkbType ) const
{
return QgsWkbTypes::singleType( inputWkbType );
}
QStringList QgsMultipartToSinglepartAlgorithm::tags() const
{
return QObject::tr( "multi,single,multiple,split,dump" ).split( ',' );
}
QString QgsMultipartToSinglepartAlgorithm::group() const
{
return QObject::tr( "Vector geometry" );
}
QString QgsMultipartToSinglepartAlgorithm::groupId() const
{
return QStringLiteral( "vectorgeometry" );
}
QString QgsMultipartToSinglepartAlgorithm::shortHelpString() const
{
return QObject::tr( "This algorithm takes a vector layer with multipart geometries and generates a new one in which all geometries contain "
"a single part. Features with multipart geometries are divided in as many different features as parts the geometry "
"contain, and the same attributes are used for each of them." );
}
QgsMultipartToSinglepartAlgorithm *QgsMultipartToSinglepartAlgorithm::createInstance() const
{
return new QgsMultipartToSinglepartAlgorithm();
}
QgsProcessingFeatureSource::Flag QgsMultipartToSinglepartAlgorithm::sourceFlags() const
{
// skip geometry checks - this algorithm can be used to repair geometries
return QgsProcessingFeatureSource::FlagSkipGeometryValidityChecks;
}
QgsFeatureSink::SinkFlags QgsMultipartToSinglepartAlgorithm::sinkFlags() const
{
return QgsFeatureSink::RegeneratePrimaryKey;
}
QgsFeatureList QgsMultipartToSinglepartAlgorithm::processFeature( const QgsFeature &feature, QgsProcessingContext &, QgsProcessingFeedback * )
{
if ( !feature.hasGeometry() )
return QgsFeatureList() << feature;
QgsGeometry inputGeometry = feature.geometry();
QgsFeatureList outputs;
if ( inputGeometry.isMultipart() )
{
const QVector<QgsGeometry> parts = inputGeometry.asGeometryCollection();
for ( const QgsGeometry &g : parts )
{
QgsFeature out;
out.setAttributes( feature.attributes() );
out.setGeometry( g );
outputs.append( out );
}
}
else
{
outputs.append( feature );
}
return outputs;
}
///@endcond