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[processing] port extract layer extent to C++
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src/analysis/processing/qgsalgorithmextentfromlayer.cpp
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| /*************************************************************************** | ||
| qgsalgorithmextentfromlayer.cpp | ||
| --------------------- | ||
| begin : November 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 "qgsalgorithmextentfromlayer.h" | ||
| #include "qgsapplication.h" | ||
| #include "qgsvectorlayer.h" | ||
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| ///@cond PRIVATE | ||
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| QString QgsExtentFromLayerAlgorithm::name() const | ||
| { | ||
| return QStringLiteral( "polygonfromlayerextent" ); | ||
| } | ||
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| QString QgsExtentFromLayerAlgorithm::displayName() const | ||
| { | ||
| return QObject::tr( "Extract layer extent" ); | ||
| } | ||
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| QStringList QgsExtentFromLayerAlgorithm::tags() const | ||
| { | ||
| return QObject::tr( "polygon,vector,raster,extent,envelope,bounds,bounding,boundary,layer,round,rounded" ).split( ',' ); | ||
| } | ||
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| QString QgsExtentFromLayerAlgorithm::group() const | ||
| { | ||
| return QObject::tr( "Raster terrain analysis" ); | ||
| } | ||
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| QString QgsExtentFromLayerAlgorithm::groupId() const | ||
| { | ||
| return QStringLiteral( "rasterterrainanalysis" ); | ||
| } | ||
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| QString QgsExtentFromLayerAlgorithm::shortHelpString() const | ||
| { | ||
| return QObject::tr( "This algorithm takes a map layer and generates a new vector " | ||
| "layer with the minimum bounding box (rectangle polygon with " | ||
| "N-S orientation) that covers the input layer. Optionally, the " | ||
| "extent can be enlarged to a rounded value." ); | ||
| } | ||
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| QString QgsExtentFromLayerAlgorithm::svgIconPath() const | ||
| { | ||
| return QgsApplication::iconPath( QStringLiteral( "/algorithms/mAlgorithmExtractLayerExtent.svg" ) ); | ||
| } | ||
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| QIcon QgsExtentFromLayerAlgorithm::icon() const | ||
| { | ||
| return QgsApplication::getThemeIcon( QStringLiteral( "/algorithms/mAlgorithmExtractLayerExtent.svg" ) ); | ||
| } | ||
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| QgsExtentFromLayerAlgorithm *QgsExtentFromLayerAlgorithm::createInstance() const | ||
| { | ||
| return new QgsExtentFromLayerAlgorithm(); | ||
| } | ||
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| void QgsExtentFromLayerAlgorithm::initAlgorithm( const QVariantMap & ) | ||
| { | ||
| addParameter( new QgsProcessingParameterMapLayer( QStringLiteral( "INPUT" ), QObject::tr( "Input layer" ) ) ); | ||
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| auto roundParam = qgis::make_unique < QgsProcessingParameterDistance >( QStringLiteral( "ROUND_TO" ), QObject::tr( "Round values to" ), 0, QStringLiteral( "INPUT" ), 0 ); | ||
| roundParam->setFlags( QgsProcessingParameterDefinition::FlagAdvanced ); | ||
| addParameter( roundParam.release() ); | ||
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| addParameter( new QgsProcessingParameterFeatureSink( QStringLiteral( "OUTPUT" ), QObject::tr( "Extent" ), QgsProcessing::TypeVectorPolygon ) ); | ||
| } | ||
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| QVariantMap QgsExtentFromLayerAlgorithm::processAlgorithm( const QVariantMap ¶meters, QgsProcessingContext &context, QgsProcessingFeedback * ) | ||
| { | ||
| QgsMapLayer *layer = parameterAsLayer( parameters, QStringLiteral( "INPUT" ), context ); | ||
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| if ( !layer ) | ||
| throw QgsProcessingException( QObject::tr( "Invalid input layer" ) ); | ||
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| double roundTo = parameterAsDouble( parameters, QStringLiteral( "ROUND_TO" ), context ); | ||
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| QgsFields fields; | ||
| fields.append( QgsField( QStringLiteral( "MINX" ), QVariant::Double ) ); | ||
| fields.append( QgsField( QStringLiteral( "MINY" ), QVariant::Double ) ); | ||
| fields.append( QgsField( QStringLiteral( "MAXX" ), QVariant::Double ) ); | ||
| fields.append( QgsField( QStringLiteral( "MAXY" ), QVariant::Double ) ); | ||
| fields.append( QgsField( QStringLiteral( "CNTX" ), QVariant::Double ) ); | ||
| fields.append( QgsField( QStringLiteral( "CNTY" ), QVariant::Double ) ); | ||
| fields.append( QgsField( QStringLiteral( "AREA" ), QVariant::Double ) ); | ||
| fields.append( QgsField( QStringLiteral( "PERIM" ), QVariant::Double ) ); | ||
| fields.append( QgsField( QStringLiteral( "HEIGHT" ), QVariant::Double ) ); | ||
| fields.append( QgsField( QStringLiteral( "WIDTH" ), QVariant::Double ) ); | ||
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| QString dest; | ||
| std::unique_ptr< QgsFeatureSink > sink( parameterAsSink( parameters, QStringLiteral( "OUTPUT" ), context, dest, fields, QgsWkbTypes::Polygon, layer->crs() ) ); | ||
| if ( !sink ) | ||
| throw QgsProcessingException( invalidSinkError( parameters, QStringLiteral( "OUTPUT" ) ) ); | ||
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| if ( QgsVectorLayer *vl = qobject_cast< QgsVectorLayer * >( layer ) ) | ||
| { | ||
| vl->updateExtents(); | ||
| } | ||
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| QgsRectangle rect = layer->extent(); | ||
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| if ( roundTo > 0 ) | ||
| { | ||
| rect.setXMinimum( std::floor( rect.xMinimum() / roundTo ) * roundTo ); | ||
| rect.setYMinimum( std::floor( rect.yMinimum() / roundTo ) * roundTo ); | ||
| rect.setXMaximum( std::ceil( rect.xMaximum() / roundTo ) * roundTo ); | ||
| rect.setYMaximum( std::ceil( rect.yMaximum() / roundTo ) * roundTo ); | ||
| } | ||
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| QgsGeometry geom = QgsGeometry::fromRect( rect ); | ||
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| double minX = rect.xMinimum(); | ||
| double maxX = rect.xMaximum(); | ||
| double minY = rect.yMinimum(); | ||
| double maxY = rect.yMaximum(); | ||
| double height = rect.height(); | ||
| double width = rect.width(); | ||
| double cntX = minX + width / 2.0; | ||
| double cntY = minY + height / 2.0; | ||
| double area = width * height; | ||
| double perim = 2 * width + 2 * height; | ||
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| QgsFeature feat; | ||
| feat.setGeometry( geom ); | ||
| feat.setAttributes( QgsAttributes() << minX << minY << maxX << maxY << cntX << cntY << area << perim << height << width ); | ||
| sink->addFeature( feat, QgsFeatureSink::FastInsert ); | ||
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| QVariantMap outputs; | ||
| outputs.insert( QStringLiteral( "OUTPUT" ), dest ); | ||
| return outputs; | ||
| } | ||
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| ///@endcond |
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