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[processing] port zonal statistics to C++
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src/analysis/processing/qgsalgorithmzonalstatistics.cpp
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| /*************************************************************************** | ||
| qgsalgorithmzonalstatistics.cpp | ||
| --------------------- | ||
| begin : December 2019 | ||
| copyright : (C) 2019 by Alexander Bruy | ||
| email : alexander dot bruy at gmail dot com | ||
| ***************************************************************************/ | ||
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| /*************************************************************************** | ||
| * * | ||
| * 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. * | ||
| * * | ||
| ***************************************************************************/ | ||
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| #include "qgsalgorithmzonalstatistics.h" | ||
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| ///@cond PRIVATE | ||
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| const std::vector< QgsZonalStatistics::Statistic > STATS | ||
| { | ||
| QgsZonalStatistics::Count, | ||
| QgsZonalStatistics::Sum, | ||
| QgsZonalStatistics::Mean, | ||
| QgsZonalStatistics::Median, | ||
| QgsZonalStatistics::StDev, | ||
| QgsZonalStatistics::Min, | ||
| QgsZonalStatistics::Max, | ||
| QgsZonalStatistics::Range, | ||
| QgsZonalStatistics::Minority, | ||
| QgsZonalStatistics::Majority, | ||
| QgsZonalStatistics::Variety, | ||
| QgsZonalStatistics::Variance, | ||
| }; | ||
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| QString QgsZonalStatisticsAlgorithm::name() const | ||
| { | ||
| return QStringLiteral( "zonalstatistics" ); | ||
| } | ||
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| QString QgsZonalStatisticsAlgorithm::displayName() const | ||
| { | ||
| return QObject::tr( "Zonal statistics" ); | ||
| } | ||
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| QStringList QgsZonalStatisticsAlgorithm::tags() const | ||
| { | ||
| return QObject::tr( "stats,statistics,zones,layer,sum,maximum,minimum,mean,count,standard,deviation," | ||
| "median,range,majority,minority,variety,variance,summary,raster" ).split( ',' ); | ||
| } | ||
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| QString QgsZonalStatisticsAlgorithm::group() const | ||
| { | ||
| return QObject::tr( "Raster analysis" ); | ||
| } | ||
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| QString QgsZonalStatisticsAlgorithm::groupId() const | ||
| { | ||
| return QStringLiteral( "rasteranalysis" ); | ||
| } | ||
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| QString QgsZonalStatisticsAlgorithm::shortHelpString() const | ||
| { | ||
| return QObject::tr( "This algorithm calculates statistics of a raster layer for each feature " | ||
| "of an overlapping polygon vector layer." ); | ||
| } | ||
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| QgsProcessingAlgorithm::Flags QgsZonalStatisticsAlgorithm::flags() const | ||
| { | ||
| return QgsProcessingAlgorithm::flags() | QgsProcessingAlgorithm::FlagNoThreading; | ||
| } | ||
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| QgsZonalStatisticsAlgorithm *QgsZonalStatisticsAlgorithm::createInstance() const | ||
| { | ||
| return new QgsZonalStatisticsAlgorithm(); | ||
| } | ||
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| void QgsZonalStatisticsAlgorithm::initAlgorithm( const QVariantMap & ) | ||
| { | ||
| QStringList statChoices; | ||
| statChoices.reserve( STATS.size() ); | ||
| for ( QgsZonalStatistics::Statistic stat : STATS ) | ||
| { | ||
| statChoices << QgsZonalStatistics::displayName( stat ); | ||
| } | ||
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| addParameter( new QgsProcessingParameterRasterLayer( QStringLiteral( "INPUT_RASTER" ), QObject::tr( "Raster layer" ) ) ); | ||
| addParameter( new QgsProcessingParameterBand( QStringLiteral( "RASTER_BAND" ), | ||
| QObject::tr( "Raster band" ), 1, QStringLiteral( "INPUT_RASTER" ) ) ); | ||
| addParameter( new QgsProcessingParameterVectorLayer( QStringLiteral( "INPUT_VECTOR" ), QObject::tr( "Vector layer containing zones" ), | ||
| QList< int >() << QgsProcessing::TypeVectorPolygon ) ); | ||
| addParameter( new QgsProcessingParameterString( QStringLiteral( "COLUMN_PREFIX" ), QObject::tr( "Output column prefix" ), QStringLiteral( "_" ) ) ); | ||
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| addParameter( new QgsProcessingParameterEnum( QStringLiteral( "STATISTICS" ), QObject::tr( "Statistics to calculate" ), | ||
| statChoices, true, QVariantList() << 0 << 1 << 2 ) ); | ||
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| addOutput( new QgsProcessingOutputVectorLayer( QStringLiteral( "INPUT_VECTOR" ), QObject::tr( "Zonal statistics" ), QgsProcessing::TypeVectorPolygon ) ); | ||
| } | ||
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| bool QgsZonalStatisticsAlgorithm::prepareAlgorithm( const QVariantMap ¶meters, QgsProcessingContext &context, QgsProcessingFeedback * ) | ||
| { | ||
| QgsRasterLayer *rasterLayer = parameterAsRasterLayer( parameters, QStringLiteral( "INPUT_RASTER" ), context ); | ||
| if ( !rasterLayer ) | ||
| throw QgsProcessingException( invalidRasterError( parameters, QStringLiteral( "INPUT_RASTER" ) ) ); | ||
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| mBand = parameterAsInt( parameters, QStringLiteral( "RASTER_BAND" ), context ); | ||
| if ( mBand < 1 || mBand > rasterLayer->bandCount() ) | ||
| throw QgsProcessingException( QObject::tr( "Invalid band number for BAND (%1): Valid values for input raster are 1 to %2" ).arg( mBand ) | ||
| .arg( rasterLayer->bandCount() ) ); | ||
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| mInterface.reset( rasterLayer->dataProvider()->clone() ); | ||
| mCrs = rasterLayer->crs(); | ||
| mPixelSizeX = rasterLayer->rasterUnitsPerPixelX(); | ||
| mPixelSizeY = rasterLayer->rasterUnitsPerPixelY(); | ||
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| mPrefix = parameterAsString( parameters, QStringLiteral( "COLUMN_PREFIX" ), context ); | ||
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| const QList< int > stats = parameterAsEnums( parameters, QStringLiteral( "STATISTICS" ), context ); | ||
| mStats = nullptr; | ||
| for ( int s : stats ) | ||
| { | ||
| mStats |= STATS.at( s ); | ||
| } | ||
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| return true; | ||
| } | ||
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| QVariantMap QgsZonalStatisticsAlgorithm::processAlgorithm( const QVariantMap ¶meters, QgsProcessingContext &context, QgsProcessingFeedback *feedback ) | ||
| { | ||
| QgsVectorLayer *layer = parameterAsVectorLayer( parameters, QStringLiteral( "INPUT_VECTOR" ), context ); | ||
| if ( !layer ) | ||
| throw QgsProcessingException( QObject::tr( "Invalid zones layer" ) ); | ||
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| QgsZonalStatistics zs( layer, | ||
| mInterface.get(), | ||
| mCrs, | ||
| mPixelSizeX, | ||
| mPixelSizeY, | ||
| mPrefix, | ||
| mBand, | ||
| QgsZonalStatistics::Statistics( mStats ) | ||
| ); | ||
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| zs.calculateStatistics( feedback ); | ||
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| QVariantMap outputs; | ||
| outputs.insert( QStringLiteral( "INPUT_VECTOR" ), layer->id() ); | ||
| return outputs; | ||
| } | ||
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| ///@endcond |
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