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[processing] port raster layer statistics to C++
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python/plugins/processing/algs/qgis/RasterLayerStatistics.py
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src/analysis/processing/qgsalgorithmrasterstatistics.cpp
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,124 @@ | ||
| /*************************************************************************** | ||
| qgsalgorithmrasterstatistics.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 "qgsalgorithmrasterstatistics.h" | ||
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| ///@cond PRIVATE | ||
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| QString QgsRasterStatisticsAlgorithm::name() const | ||
| { | ||
| return QStringLiteral( "rasterlayerstatistics" ); | ||
| } | ||
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| QString QgsRasterStatisticsAlgorithm::displayName() const | ||
| { | ||
| return QObject::tr( "Raster layer statistics" ); | ||
| } | ||
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| QStringList QgsRasterStatisticsAlgorithm::tags() const | ||
| { | ||
| return QObject::tr( "raster,stats,statistics,maximum,minimum,range,sum,mean,standard,deviation,summary" ).split( ',' ); | ||
| } | ||
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| QString QgsRasterStatisticsAlgorithm::group() const | ||
| { | ||
| return QObject::tr( "Raster analysis" ); | ||
| } | ||
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| QString QgsRasterStatisticsAlgorithm::groupId() const | ||
| { | ||
| return QStringLiteral( "rasteranalysis" ); | ||
| } | ||
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| QString QgsRasterStatisticsAlgorithm::shortHelpString() const | ||
| { | ||
| return QObject::tr( "This algorithm computes basic statistics from the values in a given band of the raster layer." ); | ||
| } | ||
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| QgsRasterStatisticsAlgorithm *QgsRasterStatisticsAlgorithm::createInstance() const | ||
| { | ||
| return new QgsRasterStatisticsAlgorithm(); | ||
| } | ||
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| void QgsRasterStatisticsAlgorithm::initAlgorithm( const QVariantMap & ) | ||
| { | ||
| addParameter( new QgsProcessingParameterRasterLayer( QStringLiteral( "INPUT" ), QObject::tr( "Input layer" ) ) ); | ||
| addParameter( new QgsProcessingParameterBand( QStringLiteral( "BAND" ), | ||
| QObject::tr( "Band number" ), 1, QStringLiteral( "INPUT" ) ) ); | ||
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| addParameter( new QgsProcessingParameterFileDestination( QStringLiteral( "OUTPUT_HTML_FILE" ), QObject::tr( "Statistics" ), | ||
| QObject::tr( "HTML files (*.html *.HTML)" ), QVariant(), true ) ); | ||
| addOutput( new QgsProcessingOutputNumber( QStringLiteral( "MIN" ), QObject::tr( "Minimum value" ) ) ); | ||
| addOutput( new QgsProcessingOutputNumber( QStringLiteral( "MAX" ), QObject::tr( "Maximum value" ) ) ); | ||
| addOutput( new QgsProcessingOutputNumber( QStringLiteral( "RANGE" ), QObject::tr( "Range" ) ) ); | ||
| addOutput( new QgsProcessingOutputNumber( QStringLiteral( "SUM" ), QObject::tr( "Sum" ) ) ); | ||
| addOutput( new QgsProcessingOutputNumber( QStringLiteral( "MEAN" ), QObject::tr( "Mean value" ) ) ); | ||
| addOutput( new QgsProcessingOutputNumber( QStringLiteral( "STD_DEV" ), QObject::tr( "Standard deviation" ) ) ); | ||
| addOutput( new QgsProcessingOutputNumber( QStringLiteral( "SUM_OF_SQUARES" ), QObject::tr( "Sum of the squares" ) ) ); | ||
| } | ||
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| QVariantMap QgsRasterStatisticsAlgorithm::processAlgorithm( const QVariantMap ¶meters, QgsProcessingContext &context, QgsProcessingFeedback * ) | ||
| { | ||
| QgsRasterLayer *layer = parameterAsRasterLayer( parameters, QStringLiteral( "INPUT" ), context ); | ||
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| if ( !layer ) | ||
| throw QgsProcessingException( invalidRasterError( parameters, QStringLiteral( "INPUT" ) ) ); | ||
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| int band = parameterAsInt( parameters, QStringLiteral( "BAND" ), context ); | ||
| if ( band < 1 || band > layer->bandCount() ) | ||
| throw QgsProcessingException( QObject::tr( "Invalid band number for BAND (%1): Valid values for input raster are 1 to %2" ).arg( band ) | ||
| .arg( layer->bandCount() ) ); | ||
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| QString outputFile = parameterAsFileOutput( parameters, QStringLiteral( "OUTPUT_HTML_FILE" ), context ); | ||
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| QgsRasterBandStats stat = layer->dataProvider()->bandStatistics( band, QgsRasterBandStats::All, QgsRectangle(), 0 ); | ||
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| QVariantMap outputs; | ||
| outputs.insert( QStringLiteral( "MIN" ), stat.minimumValue ); | ||
| outputs.insert( QStringLiteral( "MAX" ), stat.maximumValue ); | ||
| outputs.insert( QStringLiteral( "RANGE" ), stat.range ); | ||
| outputs.insert( QStringLiteral( "SUM" ), stat.sum ); | ||
| outputs.insert( QStringLiteral( "MEAN" ), stat.mean ); | ||
| outputs.insert( QStringLiteral( "STD_DEV" ), stat.stdDev ); | ||
| outputs.insert( QStringLiteral( "SUM_OF_SQUARES" ), stat.sumOfSquares ); | ||
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| if ( !outputFile.isEmpty() ) | ||
| { | ||
| QFile file( outputFile ); | ||
| if ( file.open( QIODevice::WriteOnly | QIODevice::Text ) ) | ||
| { | ||
| QTextStream out( &file ); | ||
| out << QStringLiteral( "<html><head><meta http-equiv=\"Content-Type\" content=\"text/html;charset=utf-8\"/></head><body>\n" ); | ||
| out << QObject::tr( "<p>Analyzed file: %1 (band %1)</p>\n" ).arg( layer->source() ).arg( band ); | ||
| out << QObject::tr( "<p>Minimum value: %1</p>\n" ).arg( stat.minimumValue, 0, 'g', 16 ); | ||
| out << QObject::tr( "<p>Maxumum value: %1</p>\n" ).arg( stat.maximumValue, 0, 'g', 16 ); | ||
| out << QObject::tr( "<p>Range: %1</p>\n" ).arg( stat.range, 0, 'g', 16 ); | ||
| out << QObject::tr( "<p>Sum: %1</p>\n" ).arg( stat.sum, 0, 'g', 16 ); | ||
| out << QObject::tr( "<p>Mean value: %1</p>\n" ).arg( stat.mean, 0, 'g', 16 ); | ||
| out << QObject::tr( "<p>Standard deviation: %1</p>\n" ).arg( stat.stdDev, 0, 'g', 16 ); | ||
| out << QObject::tr( "<p>Sum of the squares: %1</p>\n" ).arg( stat.sumOfSquares, 0, 'g', 16 ); | ||
| out << QStringLiteral( "</body></html>" ); | ||
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| outputs.insert( QStringLiteral( "OUTPUT_HTML_FILE" ), outputFile ); | ||
| } | ||
| } | ||
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| return outputs; | ||
| } | ||
|
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| ///@endcond |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| /*************************************************************************** | ||
| qgsalgorithmrasterstatistics.h | ||
| ------------------------------ | ||
| begin : December 2019 | ||
| copyright : (C) 2019 by Alexander Bruy | ||
| email : alexander dot bruy 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. * | ||
| * * | ||
| ***************************************************************************/ | ||
|
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| #ifndef QGSALGORITHMRASTERSTATISTICS_H | ||
| #define QGSALGORITHMRASTERSTATISTICS_H | ||
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| #define SIP_NO_FILE | ||
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| #include "qgis_sip.h" | ||
| #include "qgsprocessingalgorithm.h" | ||
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| ///@cond PRIVATE | ||
|
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| /** | ||
| * Native raster statistics algorithm. | ||
| */ | ||
| class QgsRasterStatisticsAlgorithm : public QgsProcessingAlgorithm | ||
| { | ||
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| public: | ||
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| QgsRasterStatisticsAlgorithm() = default; | ||
| QString name() const override; | ||
| QString displayName() const override; | ||
| QStringList tags() const override; | ||
| QString group() const override; | ||
| QString groupId() const override; | ||
| QString shortHelpString() const override; | ||
| void initAlgorithm( const QVariantMap &configuration = QVariantMap() ) override; | ||
| QgsRasterStatisticsAlgorithm *createInstance() const override SIP_FACTORY; | ||
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| protected: | ||
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| QVariantMap processAlgorithm( const QVariantMap ¶meters, | ||
| QgsProcessingContext &context, QgsProcessingFeedback *feedback ) override; | ||
| }; | ||
|
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| ///@endcond PRIVATE | ||
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| #endif // QGSALGORITHMRASTERSTATISTICS_H |
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