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[processing] port geometry by expression to C++
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python/plugins/processing/algs/qgis/GeometryByExpression.py
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src/analysis/processing/qgsalgorithmgeometrybyexpression.cpp
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| /*************************************************************************** | ||
| qgsalgorithmgeometrybyexpression.cpp | ||
| ------------------------ | ||
| begin : November 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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| #include "qgsalgorithmgeometrybyexpression.h" | ||
| #include "qgsgeometrycollection.h" | ||
|
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| ///@cond PRIVATE | ||
|
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| QString QgsGeometryByExpressionAlgorithm::name() const | ||
| { | ||
| return QStringLiteral( "geometrybyexpression" ); | ||
| } | ||
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| QString QgsGeometryByExpressionAlgorithm::displayName() const | ||
| { | ||
| return QObject::tr( "Geometry by expression" ); | ||
| } | ||
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| QStringList QgsGeometryByExpressionAlgorithm::tags() const | ||
| { | ||
| return QObject::tr( "geometry,expression,create,modify" ).split( ',' ); | ||
| } | ||
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| QString QgsGeometryByExpressionAlgorithm::group() const | ||
| { | ||
| return QObject::tr( "Vector geometry" ); | ||
| } | ||
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| QString QgsGeometryByExpressionAlgorithm::groupId() const | ||
| { | ||
| return QStringLiteral( "vectorgeometry" ); | ||
| } | ||
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| QString QgsGeometryByExpressionAlgorithm::outputName() const | ||
| { | ||
| return QObject::tr( "Modified geometry" ); | ||
| } | ||
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| QString QgsGeometryByExpressionAlgorithm::shortHelpString() const | ||
| { | ||
| return QObject::tr( "This algorithm updates existing geometries (or creates new geometries) for input " | ||
| "features by use of a QGIS expression. This allows complex geometry modifications " | ||
| "which can utilize all the flexibility of the QGIS expression engine to manipulate " | ||
| "and create geometries for output features.\n\n" | ||
| "For help with QGIS expression functions, see the inbuilt help for specific functions " | ||
| "which is available in the expression builder." ); | ||
| } | ||
|
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| QgsGeometryByExpressionAlgorithm *QgsGeometryByExpressionAlgorithm::createInstance() const | ||
| { | ||
| return new QgsGeometryByExpressionAlgorithm(); | ||
| } | ||
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| QList<int> QgsGeometryByExpressionAlgorithm::inputLayerTypes() const | ||
| { | ||
| return QList< int >() << QgsProcessing::TypeVector; | ||
| } | ||
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| QgsWkbTypes::Type QgsGeometryByExpressionAlgorithm::outputWkbType( QgsWkbTypes::Type ) const | ||
| { | ||
| return mWkbType; | ||
| } | ||
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| QgsProcessingFeatureSource::Flag QgsGeometryByExpressionAlgorithm::sourceFlags() const | ||
| { | ||
| return QgsProcessingFeatureSource::FlagSkipGeometryValidityChecks; | ||
| } | ||
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| void QgsGeometryByExpressionAlgorithm::initParameters( const QVariantMap & ) | ||
| { | ||
| addParameter( new QgsProcessingParameterEnum( QStringLiteral( "OUTPUT_GEOMETRY" ), QObject::tr( "Output geometry type" ), | ||
| QStringList() << QObject::tr( "Polygon" ) << QObject::tr( "Line" ) << QObject::tr( "Point" ), false, 0 ) ); | ||
| addParameter( new QgsProcessingParameterBoolean( QStringLiteral( "WITH_Z" ), QObject::tr( "Output geometry has z dimension" ), false ) ); | ||
| addParameter( new QgsProcessingParameterBoolean( QStringLiteral( "WITH_M" ), QObject::tr( "Output geometry has m values" ), false ) ); | ||
| addParameter( new QgsProcessingParameterExpression( QStringLiteral( "EXPRESSION" ), QObject::tr( "Geometry expression" ), | ||
| QStringLiteral( "$geometry" ), QStringLiteral( "INPUT" ) ) ); | ||
| } | ||
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| bool QgsGeometryByExpressionAlgorithm::prepareAlgorithm( const QVariantMap ¶meters, QgsProcessingContext &context, QgsProcessingFeedback *feedback ) | ||
| { | ||
| int geometryType = parameterAsInt( parameters, QStringLiteral( "OUTPUT_GEOMETRY" ), context ); | ||
| switch ( geometryType ) | ||
| { | ||
| case 0: | ||
| mWkbType = QgsWkbTypes::Type::Polygon; | ||
| break; | ||
| case 1: | ||
| mWkbType = QgsWkbTypes::Type::LineString; | ||
| break; | ||
| case 2: | ||
| mWkbType = QgsWkbTypes::Type::Point; | ||
| break; | ||
| } | ||
|
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| if ( parameterAsBoolean( parameters, QStringLiteral( "WITH_Z" ), context ) ) | ||
| { | ||
| mWkbType = QgsWkbTypes::addZ( mWkbType ); | ||
| } | ||
| if ( parameterAsBoolean( parameters, QStringLiteral( "WITH_M" ), context ) ) | ||
| { | ||
| mWkbType = QgsWkbTypes::addM( mWkbType ); | ||
| } | ||
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| mExpression = QgsExpression( parameterAsString( parameters, QStringLiteral( "EXPRESSION" ), context ) ); | ||
| if ( mExpression.hasParserError() ) | ||
| { | ||
| feedback->reportError( mExpression.parserErrorString() ); | ||
| return false; | ||
| } | ||
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| mExpressionContext = createExpressionContext( parameters, context ); | ||
| mExpression.prepare( &mExpressionContext ); | ||
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| return true; | ||
| } | ||
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| QgsFeatureList QgsGeometryByExpressionAlgorithm::processFeature( const QgsFeature &f, QgsProcessingContext &, QgsProcessingFeedback * ) | ||
| { | ||
| QgsFeature feature = f; | ||
| mExpressionContext.setFeature( feature ); | ||
| QVariant value = mExpression.evaluate( &mExpressionContext ); | ||
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| if ( mExpression.hasEvalError() ) | ||
| { | ||
| throw QgsProcessingException( QObject::tr( "Evaluation error: %1" ).arg( mExpression.evalErrorString() ) ); | ||
| } | ||
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| if ( value.isNull() ) | ||
| { | ||
| feature.setGeometry( QgsGeometry() ); | ||
| } | ||
| else | ||
| { | ||
| if ( value.canConvert< QgsGeometry >() ) | ||
| { | ||
| QgsGeometry geom = value.value<QgsGeometry>(); | ||
| feature.setGeometry( geom ); | ||
| } | ||
| else | ||
| { | ||
| throw QgsProcessingException( QObject::tr( "%1 is not a geometry" ).arg( value.toString() ) ); | ||
| } | ||
| } | ||
|
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| return QgsFeatureList() << feature; | ||
| } | ||
|
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| ///@endcond |
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