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89 lines
3.0 KiB
C++
89 lines
3.0 KiB
C++
/***************************************************************************
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qgsalgorithmcentroid.cpp
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------------------------
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begin : April 2017
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copyright : (C) 2017 by Nyall Dawson
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email : nyall dot dawson at gmail dot com
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#include "qgsalgorithmcentroid.h"
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///@cond PRIVATE
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QString QgsCentroidAlgorithm::name() const
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{
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return QStringLiteral( "centroids" );
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}
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QString QgsCentroidAlgorithm::displayName() const
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{
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return QObject::tr( "Centroids" );
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}
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QStringList QgsCentroidAlgorithm::tags() const
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{
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return QObject::tr( "centroid,center,average,point,middle" ).split( ',' );
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}
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QString QgsCentroidAlgorithm::group() const
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{
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return QObject::tr( "Vector geometry" );
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}
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QString QgsCentroidAlgorithm::groupId() const
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{
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return QStringLiteral( "vectorgeometry" );
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}
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QString QgsCentroidAlgorithm::outputName() const
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{
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return QObject::tr( "Centroids" );
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}
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QgsProcessingAlgorithm::Flags QgsCentroidAlgorithm::flags() const
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{
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return QgsProcessingFeatureBasedAlgorithm::flags() | QgsProcessingAlgorithm::FlagCanRunInBackground;
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}
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void QgsCentroidAlgorithm::initAlgorithm( const QVariantMap & )
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{
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addParameter( new QgsProcessingParameterFeatureSource( QStringLiteral( "INPUT" ), QObject::tr( "Input layer" ) ) );
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addParameter( new QgsProcessingParameterFeatureSink( QStringLiteral( "OUTPUT" ), QObject::tr( "Centroids" ), QgsProcessing::TypeVectorPoint ) );
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}
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QString QgsCentroidAlgorithm::shortHelpString() const
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{
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return QObject::tr( "This algorithm creates a new point layer, with points representing the centroid of the geometries in an input layer.\n\n"
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"The attributes associated to each point in the output layer are the same ones associated to the original features." );
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}
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QgsCentroidAlgorithm *QgsCentroidAlgorithm::createInstance() const
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{
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return new QgsCentroidAlgorithm();
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}
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QgsFeature QgsCentroidAlgorithm::processFeature( const QgsFeature &f, QgsProcessingContext &, QgsProcessingFeedback *feedback )
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{
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QgsFeature feature = f;
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if ( feature.hasGeometry() )
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{
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feature.setGeometry( feature.geometry().centroid() );
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if ( !feature.geometry() )
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{
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feedback->pushInfo( QObject::tr( "Error calculating centroid for feature %1" ).arg( feature.id() ) );
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}
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}
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return feature;
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}
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///@endcond
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