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qgsalgorithmintersection.cpp
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qgsalgorithmintersection.cpp
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/***************************************************************************
qgsalgorithmintersection.cpp
---------------------
Date : April 2018
Copyright : (C) 2018 by Martin Dobias
Email : wonder dot sk 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 "qgsalgorithmintersection.h"
#include "qgsgeometrycollection.h"
#include "qgsgeometryengine.h"
#include "qgsoverlayutils.h"
///@cond PRIVATE
QString QgsIntersectionAlgorithm::name() const
{
return QStringLiteral( "intersection" );
}
QString QgsIntersectionAlgorithm::displayName() const
{
return QObject::tr( "Intersection" );
}
QString QgsIntersectionAlgorithm::group() const
{
return QObject::tr( "Vector overlay" );
}
QString QgsIntersectionAlgorithm::groupId() const
{
return QStringLiteral( "vectoroverlay" );
}
QString QgsIntersectionAlgorithm::shortHelpString() const
{
return QObject::tr( "This algorithm extracts the overlapping portions of features in the Input and Overlay layers. "
"Features in the output Intersection layer are assigned the attributes of the overlapping features "
"from both the Input and Overlay layers." );
}
QgsProcessingAlgorithm *QgsIntersectionAlgorithm::createInstance() const
{
return new QgsIntersectionAlgorithm();
}
void QgsIntersectionAlgorithm::initAlgorithm( const QVariantMap & )
{
addParameter( new QgsProcessingParameterFeatureSource( QStringLiteral( "INPUT" ), QObject::tr( "Input layer" ) ) );
addParameter( new QgsProcessingParameterFeatureSource( QStringLiteral( "OVERLAY" ), QObject::tr( "Overlay layer" ) ) );
addParameter( new QgsProcessingParameterField(
QStringLiteral( "INPUT_FIELDS" ),
QObject::tr( "Input fields to keep (leave empty to keep all fields)" ), QVariant(),
QStringLiteral( "INPUT" ), QgsProcessingParameterField::Any, true, true ) );
addParameter( new QgsProcessingParameterField(
QStringLiteral( "OVERLAY_FIELDS" ),
QObject::tr( "Overlay fields to keep (leave empty to keep all fields)" ), QVariant(),
QStringLiteral( "OVERLAY" ), QgsProcessingParameterField::Any, true, true ) );
addParameter( new QgsProcessingParameterFeatureSink( QStringLiteral( "OUTPUT" ), QObject::tr( "Intersection" ) ) );
}
QVariantMap QgsIntersectionAlgorithm::processAlgorithm( const QVariantMap ¶meters, QgsProcessingContext &context, QgsProcessingFeedback *feedback )
{
std::unique_ptr< QgsFeatureSource > sourceA( parameterAsSource( parameters, QStringLiteral( "INPUT" ), context ) );
if ( !sourceA )
throw QgsProcessingException( invalidSourceError( parameters, QStringLiteral( "INPUT" ) ) );
std::unique_ptr< QgsFeatureSource > sourceB( parameterAsSource( parameters, QStringLiteral( "OVERLAY" ), context ) );
if ( !sourceB )
throw QgsProcessingException( invalidSourceError( parameters, QStringLiteral( "OVERLAY" ) ) );
QgsWkbTypes::Type geomType = QgsWkbTypes::multiType( sourceA->wkbType() );
const QStringList fieldsA = parameterAsFields( parameters, QStringLiteral( "INPUT_FIELDS" ), context );
const QStringList fieldsB = parameterAsFields( parameters, QStringLiteral( "OVERLAY_FIELDS" ), context );
QList<int> fieldIndicesA = QgsProcessingUtils::fieldNamesToIndices( fieldsA, sourceA->fields() );
QList<int> fieldIndicesB = QgsProcessingUtils::fieldNamesToIndices( fieldsB, sourceB->fields() );
QgsFields outputFields = QgsProcessingUtils::combineFields(
QgsProcessingUtils::indicesToFields( fieldIndicesA, sourceA->fields() ),
QgsProcessingUtils::indicesToFields( fieldIndicesB, sourceB->fields() ) );
QString dest;
std::unique_ptr< QgsFeatureSink > sink( parameterAsSink( parameters, QStringLiteral( "OUTPUT" ), context, dest, outputFields, geomType, sourceA->sourceCrs(), QgsFeatureSink::RegeneratePrimaryKey ) );
if ( !sink )
throw QgsProcessingException( invalidSinkError( parameters, QStringLiteral( "OUTPUT" ) ) );
QVariantMap outputs;
outputs.insert( QStringLiteral( "OUTPUT" ), dest );
int count = 0;
int total = sourceA->featureCount();
QgsOverlayUtils::intersection( *sourceA, *sourceB, *sink, context, feedback, count, total, fieldIndicesA, fieldIndicesB );
return outputs;
}
///@endcond