QGIS API Documentation  3.11.0-Master (68611307d7)
Static Public Member Functions | List of all members
QgsProcessingParameters Class Reference

A collection of utilities for working with parameters when running a processing algorithm. More...

#include <qgsprocessingparameters.h>

Static Public Member Functions

static QString descriptionFromName (const QString &name)
 Creates an autogenerated parameter description from a parameter name. More...
 
static bool isDynamic (const QVariantMap &parameters, const QString &name)
 Returns true if the parameter with matching name is a dynamic parameter, and must be evaluated once for every input feature processed. More...
 
static bool parameterAsBool (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, const QgsProcessingContext &context)
 Evaluates the parameter with matching definition to a static boolean value. More...
 
static bool parameterAsBool (const QgsProcessingParameterDefinition *definition, const QVariant &value, const QgsProcessingContext &context)
 Evaluates the parameter with matching definition and value to a static boolean value. More...
 
static bool parameterAsBoolean (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, const QgsProcessingContext &context)
 Evaluates the parameter with matching definition to a static boolean value. More...
 
static bool parameterAsBoolean (const QgsProcessingParameterDefinition *definition, const QVariant &value, const QgsProcessingContext &context)
 Evaluates the parameter with matching definition and value to a static boolean value. More...
 
static QColor parameterAsColor (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
 Returns the color associated with an point parameter value, or an invalid color if the parameter was not set. More...
 
static QColor parameterAsColor (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
 Returns the color associated with an color parameter value, or an invalid color if the parameter was not set. More...
 
static QString parameterAsCompatibleSourceLayerPath (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context, const QStringList &compatibleFormats, const QString &preferredFormat=QString("shp"), QgsProcessingFeedback *feedback=nullptr)
 Evaluates the parameter with matching definition to a source vector layer file path of compatible format. More...
 
static QString parameterAsCompatibleSourceLayerPathAndLayerName (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context, const QStringList &compatibleFormats, const QString &preferredFormat=QString("shp"), QgsProcessingFeedback *feedback=nullptr, QString *layerName=nullptr)
 Evaluates the parameter with matching definition to a source vector layer file path and layer name of compatible format. More...
 
static QgsCoordinateReferenceSystem parameterAsCrs (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
 Evaluates the parameter with matching definition to a coordinate reference system. More...
 
static QgsCoordinateReferenceSystem parameterAsCrs (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
 Evaluates the parameter with matching definition and value to a coordinate reference system. More...
 
static double parameterAsDouble (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, const QgsProcessingContext &context)
 Evaluates the parameter with matching definition to a static double value. More...
 
static double parameterAsDouble (const QgsProcessingParameterDefinition *definition, const QVariant &value, const QgsProcessingContext &context)
 Evaluates the parameter with matching definition and value to a static double value. More...
 
static int parameterAsEnum (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, const QgsProcessingContext &context)
 Evaluates the parameter with matching definition to a enum value. More...
 
static int parameterAsEnum (const QgsProcessingParameterDefinition *definition, const QVariant &value, const QgsProcessingContext &context)
 Evaluates the parameter with matching definition and value to a enum value. More...
 
static QList< int > parameterAsEnums (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, const QgsProcessingContext &context)
 Evaluates the parameter with matching definition to list of enum values. More...
 
static QList< int > parameterAsEnums (const QgsProcessingParameterDefinition *definition, const QVariant &value, const QgsProcessingContext &context)
 Evaluates the parameter with matching definition and value to list of enum values. More...
 
static QString parameterAsExpression (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, const QgsProcessingContext &context)
 Evaluates the parameter with matching definition to an expression. More...
 
static QString parameterAsExpression (const QgsProcessingParameterDefinition *definition, const QVariant &value, const QgsProcessingContext &context)
 Evaluates the parameter with matching definitionand value to an expression. More...
 
static QgsRectangle parameterAsExtent (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context, const QgsCoordinateReferenceSystem &crs=QgsCoordinateReferenceSystem())
 Evaluates the parameter with matching definition to a rectangular extent. More...
 
static QgsRectangle parameterAsExtent (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context, const QgsCoordinateReferenceSystem &crs=QgsCoordinateReferenceSystem())
 Evaluates the parameter with matching definition and value to a rectangular extent. More...
 
static QgsCoordinateReferenceSystem parameterAsExtentCrs (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
 Returns the coordinate reference system associated with an extent parameter value. More...
 
static QgsGeometry parameterAsExtentGeometry (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context, const QgsCoordinateReferenceSystem &crs=QgsCoordinateReferenceSystem())
 Evaluates the parameter with matching definition to a rectangular extent, and returns a geometry covering this extent. More...
 
static QStringList parameterAsFields (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
 Evaluates the parameter with matching definition to a list of fields. More...
 
static QStringList parameterAsFields (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
 Evaluates the parameter with matching definition and value to a list of fields. More...
 
static QString parameterAsFile (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
 Evaluates the parameter with matching definition to a file/folder name. More...
 
static QString parameterAsFile (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
 Evaluates the parameter with matching definition and value to a file/folder name. More...
 
static QStringList parameterAsFileList (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
 Evaluates the parameter with matching definition to a list of files (for QgsProcessingParameterMultipleLayers in QgsProcessing:TypeFile mode). More...
 
static QStringList parameterAsFileList (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
 Evaluates the parameter with matching definition to a list of files (for QgsProcessingParameterMultipleLayers in QgsProcessing:TypeFile mode). More...
 
static QString parameterAsFileOutput (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
 Evaluates the parameter with matching definition to a file based output destination. More...
 
static QString parameterAsFileOutput (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
 Evaluates the parameter with matching definition and value to a file based output destination. More...
 
static int parameterAsInt (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, const QgsProcessingContext &context)
 Evaluates the parameter with matching definition to a static integer value. More...
 
static int parameterAsInt (const QgsProcessingParameterDefinition *definition, const QVariant &value, const QgsProcessingContext &context)
 Evaluates the parameter with matching definition and value to a static integer value. More...
 
static QList< int > parameterAsInts (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, const QgsProcessingContext &context)
 Evaluates the parameter with matching definition to a list of integer values. More...
 
static QList< int > parameterAsInts (const QgsProcessingParameterDefinition *definition, const QVariant &value, const QgsProcessingContext &context)
 Evaluates the parameter with matching definition and value to a list of integer values. More...
 
static QgsMapLayerparameterAsLayer (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
 Evaluates the parameter with matching definition to a map layer. More...
 
static QgsMapLayerparameterAsLayer (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
 Evaluates the parameter with matching definition and value to a map layer. More...
 
static QList< QgsMapLayer * > parameterAsLayerList (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
 Evaluates the parameter with matching definition to a list of map layers. More...
 
static QList< QgsMapLayer * > parameterAsLayerList (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
 Evaluates the parameter with matching definition and value to a list of map layers. More...
 
static QgsPrintLayoutparameterAsLayout (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
 Evaluates the parameter with matching definition to a print layout. More...
 
static QgsPrintLayoutparameterAsLayout (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
 Evaluates the parameter with matching definition and value to a print layout. More...
 
static QgsLayoutItemparameterAsLayoutItem (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context, QgsPrintLayout *layout)
 Evaluates the parameter with matching definition to a print layout item, taken from the specified layout. More...
 
static QgsLayoutItemparameterAsLayoutItem (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context, QgsPrintLayout *layout)
 Evaluates the parameter with matching definition and value to a print layout, taken from the specified layout. More...
 
static QVariantList parameterAsMatrix (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
 Evaluates the parameter with matching definition to a matrix/table of values. More...
 
static QVariantList parameterAsMatrix (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
 Evaluates the parameter with matching definition and value to a matrix/table of values. More...
 
static QgsMeshLayerparameterAsMeshLayer (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
 Evaluates the parameter with matching definition and value to a mesh layer. More...
 
static QgsMeshLayerparameterAsMeshLayer (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
 Evaluates the parameter with matching definition and value to a mesh layer. More...
 
static QString parameterAsOutputLayer (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
 Evaluates the parameter with matching definition to a output layer destination. More...
 
static QString parameterAsOutputLayer (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
 Evaluates the parameter with matching definition and value to a output layer destination. More...
 
static QgsPointXY parameterAsPoint (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context, const QgsCoordinateReferenceSystem &crs=QgsCoordinateReferenceSystem())
 Evaluates the parameter with matching definition to a point. More...
 
static QgsPointXY parameterAsPoint (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context, const QgsCoordinateReferenceSystem &crs=QgsCoordinateReferenceSystem())
 Evaluates the parameter with matching definition and value to a point. More...
 
static QgsCoordinateReferenceSystem parameterAsPointCrs (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
 Returns the coordinate reference system associated with an point parameter value. More...
 
static QgsCoordinateReferenceSystem parameterAsPointCrs (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
 Returns the coordinate reference system associated with an point parameter value. More...
 
static QList< double > parameterAsRange (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
 Evaluates the parameter with matching definition to a range of values. More...
 
static QList< double > parameterAsRange (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
 Evaluates the parameter with matching definition and value to a range of values. More...
 
static QgsRasterLayerparameterAsRasterLayer (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
 Evaluates the parameter with matching definition to a raster layer. More...
 
static QgsRasterLayerparameterAsRasterLayer (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
 Evaluates the parameter with matching definition and value to a raster layer. More...
 
static QgsFeatureSinkparameterAsSink (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, const QgsFields &fields, QgsWkbTypes::Type geometryType, const QgsCoordinateReferenceSystem &crs, QgsProcessingContext &context, QString &destinationIdentifier, QgsFeatureSink::SinkFlags sinkFlags=nullptr)
 Evaluates the parameter with matching definition to a feature sink. More...
 
static QgsFeatureSinkparameterAsSink (const QgsProcessingParameterDefinition *definition, const QVariant &value, const QgsFields &fields, QgsWkbTypes::Type geometryType, const QgsCoordinateReferenceSystem &crs, QgsProcessingContext &context, QString &destinationIdentifier, QgsFeatureSink::SinkFlags sinkFlags=nullptr)
 Evaluates the parameter with matching definition and value to a feature sink. More...
 
static QgsProcessingFeatureSourceparameterAsSource (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
 Evaluates the parameter with matching definition to a feature source. More...
 
static QgsProcessingFeatureSourceparameterAsSource (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
 Evaluates the parameter with matching definition and value to a feature source. More...
 
static QString parameterAsString (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, const QgsProcessingContext &context)
 Evaluates the parameter with matching definition to a static string value. More...
 
static QString parameterAsString (const QgsProcessingParameterDefinition *definition, const QVariant &value, const QgsProcessingContext &context)
 Evaluates the parameter with matching definition and value to a static string value. More...
 
static QgsVectorLayerparameterAsVectorLayer (const QgsProcessingParameterDefinition *definition, const QVariantMap &parameters, QgsProcessingContext &context)
 Evaluates the parameter with matching definition to a vector layer. More...
 
static QgsVectorLayerparameterAsVectorLayer (const QgsProcessingParameterDefinition *definition, const QVariant &value, QgsProcessingContext &context)
 Evaluates the parameter with matching definition and value to a vector layer. More...
 
static QgsProcessingParameterDefinitionparameterFromScriptCode (const QString &code)
 Creates a new QgsProcessingParameterDefinition using the configuration from a supplied script code string. More...
 
static QgsProcessingParameterDefinitionparameterFromVariantMap (const QVariantMap &map)
 Creates a new QgsProcessingParameterDefinition using the configuration from a supplied variant map. More...
 

Detailed Description

A collection of utilities for working with parameters when running a processing algorithm.

Parameters are stored in a QVariantMap and referenced by a unique string key. The QVariants in parameters are not usually accessed directly, and instead the high level API provided through QgsProcessingParameters parameterAsString(), parameterAsDouble() are used instead.

Parameters are evaluated using a provided QgsProcessingContext, allowing the evaluation to understand available map layers and expression contexts (for expression based parameters).

Since
QGIS 3.0

Definition at line 618 of file qgsprocessingparameters.h.

Member Function Documentation

◆ descriptionFromName()

QString QgsProcessingParameters::descriptionFromName ( const QString &  name)
static

Creates an autogenerated parameter description from a parameter name.

Definition at line 1732 of file qgsprocessingparameters.cpp.

◆ isDynamic()

bool QgsProcessingParameters::isDynamic ( const QVariantMap &  parameters,
const QString &  name 
)
static

Returns true if the parameter with matching name is a dynamic parameter, and must be evaluated once for every input feature processed.

Definition at line 56 of file qgsprocessingparameters.cpp.

◆ parameterAsBool() [1/2]

bool QgsProcessingParameters::parameterAsBool ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
const QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition to a static boolean value.

Definition at line 342 of file qgsprocessingparameters.cpp.

◆ parameterAsBool() [2/2]

bool QgsProcessingParameters::parameterAsBool ( const QgsProcessingParameterDefinition definition,
const QVariant &  value,
const QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition and value to a static boolean value.

Since
QGIS 3.4

Definition at line 358 of file qgsprocessingparameters.cpp.

◆ parameterAsBoolean() [1/2]

bool QgsProcessingParameters::parameterAsBoolean ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
const QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition to a static boolean value.

Since
QGIS 3.8

Definition at line 350 of file qgsprocessingparameters.cpp.

◆ parameterAsBoolean() [2/2]

bool QgsProcessingParameters::parameterAsBoolean ( const QgsProcessingParameterDefinition definition,
const QVariant &  value,
const QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition and value to a static boolean value.

Since
QGIS 3.8

Definition at line 374 of file qgsprocessingparameters.cpp.

◆ parameterAsColor() [1/2]

QColor QgsProcessingParameters::parameterAsColor ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
QgsProcessingContext context 
)
static

Returns the color associated with an point parameter value, or an invalid color if the parameter was not set.

Since
QGIS 3.10

Definition at line 1609 of file qgsprocessingparameters.cpp.

◆ parameterAsColor() [2/2]

QColor QgsProcessingParameters::parameterAsColor ( const QgsProcessingParameterDefinition definition,
const QVariant &  value,
QgsProcessingContext context 
)
static

Returns the color associated with an color parameter value, or an invalid color if the parameter was not set.

Since
QGIS 3.10

Definition at line 1617 of file qgsprocessingparameters.cpp.

◆ parameterAsCompatibleSourceLayerPath()

QString QgsProcessingParameters::parameterAsCompatibleSourceLayerPath ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
QgsProcessingContext context,
const QStringList &  compatibleFormats,
const QString &  preferredFormat = QString( "shp" ),
QgsProcessingFeedback feedback = nullptr 
)
static

Evaluates the parameter with matching definition to a source vector layer file path of compatible format.

If the parameter is evaluated to an existing layer, and that layer is not of the format listed in the compatibleFormats argument, then the layer will first be exported to a compatible format in a temporary location. The function will then return the path to that temporary file.

compatibleFormats should consist entirely of lowercase file extensions, e.g. 'shp'.

The preferredFormat argument is used to specify to desired file extension to use when a temporary layer export is required. This defaults to shapefiles, because shapefiles are the future (don't believe the geopackage hype!).

When an algorithm is capable of handling multi-layer input files (such as Geopackage), it is preferable to use parameterAsCompatibleSourceLayerPathAndLayerName() which may avoid conversion in more situations.

Definition at line 555 of file qgsprocessingparameters.cpp.

◆ parameterAsCompatibleSourceLayerPathAndLayerName()

QString QgsProcessingParameters::parameterAsCompatibleSourceLayerPathAndLayerName ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
QgsProcessingContext context,
const QStringList &  compatibleFormats,
const QString &  preferredFormat = QString( "shp" ),
QgsProcessingFeedback feedback = nullptr,
QString *  layerName = nullptr 
)
static

Evaluates the parameter with matching definition to a source vector layer file path and layer name of compatible format.

If the parameter is evaluated to an existing layer, and that layer is not of the format listed in the compatibleFormats argument, then the layer will first be exported to a compatible format in a temporary location. The function will then return the path to that temporary file.

compatibleFormats should consist entirely of lowercase file extensions, e.g. 'shp'.

The preferredFormat argument is used to specify to desired file extension to use when a temporary layer export is required. This defaults to shapefiles, because shapefiles are the future (don't believe the geopackage hype!).

This method should be preferred over parameterAsCompatibleSourceLayerPath() when an algorithm is able to correctly handle files with multiple layers. Unlike parameterAsCompatibleSourceLayerPath(), it will not force a conversion in this case and will return the target layer name in the layerName argument.

Parameters
definitionassociated parameter definition
parametersinput parameter value map
contextprocessing context
compatibleFormatsa list of lowercase file extensions compatible with the algorithm
preferredFormatpreferred format extension to use if conversion if required
feedbackfeedback object
layerNamewill be set to the target layer name for multi-layer sources (e.g. Geopackage)
Returns
path to source layer, or nearly converted compatible layer
See also
parameterAsCompatibleSourceLayerPath()
Since
QGIS 3.10

Definition at line 560 of file qgsprocessingparameters.cpp.

◆ parameterAsCrs() [1/2]

QgsCoordinateReferenceSystem QgsProcessingParameters::parameterAsCrs ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition to a coordinate reference system.

Definition at line 772 of file qgsprocessingparameters.cpp.

◆ parameterAsCrs() [2/2]

QgsCoordinateReferenceSystem QgsProcessingParameters::parameterAsCrs ( const QgsProcessingParameterDefinition definition,
const QVariant &  value,
QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition and value to a coordinate reference system.

Since
QGIS 3.4

Definition at line 780 of file qgsprocessingparameters.cpp.

◆ parameterAsDouble() [1/2]

double QgsProcessingParameters::parameterAsDouble ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
const QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition to a static double value.

Definition at line 125 of file qgsprocessingparameters.cpp.

◆ parameterAsDouble() [2/2]

double QgsProcessingParameters::parameterAsDouble ( const QgsProcessingParameterDefinition definition,
const QVariant &  value,
const QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition and value to a static double value.

Since
QGIS 3.4

Definition at line 133 of file qgsprocessingparameters.cpp.

◆ parameterAsEnum() [1/2]

int QgsProcessingParameters::parameterAsEnum ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
const QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition to a enum value.

Definition at line 251 of file qgsprocessingparameters.cpp.

◆ parameterAsEnum() [2/2]

int QgsProcessingParameters::parameterAsEnum ( const QgsProcessingParameterDefinition definition,
const QVariant &  value,
const QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition and value to a enum value.

Since
QGIS 3.4

Definition at line 259 of file qgsprocessingparameters.cpp.

◆ parameterAsEnums() [1/2]

QList< int > QgsProcessingParameters::parameterAsEnums ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
const QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition to list of enum values.

Definition at line 273 of file qgsprocessingparameters.cpp.

◆ parameterAsEnums() [2/2]

QList< int > QgsProcessingParameters::parameterAsEnums ( const QgsProcessingParameterDefinition definition,
const QVariant &  value,
const QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition and value to list of enum values.

Since
QGIS 3.4

Definition at line 281 of file qgsprocessingparameters.cpp.

◆ parameterAsExpression() [1/2]

QString QgsProcessingParameters::parameterAsExpression ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
const QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition to an expression.

Definition at line 97 of file qgsprocessingparameters.cpp.

◆ parameterAsExpression() [2/2]

QString QgsProcessingParameters::parameterAsExpression ( const QgsProcessingParameterDefinition definition,
const QVariant &  value,
const QgsProcessingContext context 
)
static

Evaluates the parameter with matching definitionand value to an expression.

Since
QGIS 3.4

Definition at line 105 of file qgsprocessingparameters.cpp.

◆ parameterAsExtent() [1/2]

QgsRectangle QgsProcessingParameters::parameterAsExtent ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
QgsProcessingContext context,
const QgsCoordinateReferenceSystem crs = QgsCoordinateReferenceSystem() 
)
static

Evaluates the parameter with matching definition to a rectangular extent.

If crs is set, and the original coordinate reference system of the parameter can be determined, then the extent will be automatically reprojected so that it is in the specified crs. In this case the extent of the reproject rectangle will be returned.

See also
parameterAsExtentGeometry()
parameterAsExtentCrs()

Definition at line 788 of file qgsprocessingparameters.cpp.

◆ parameterAsExtent() [2/2]

QgsRectangle QgsProcessingParameters::parameterAsExtent ( const QgsProcessingParameterDefinition definition,
const QVariant &  value,
QgsProcessingContext context,
const QgsCoordinateReferenceSystem crs = QgsCoordinateReferenceSystem() 
)
static

Evaluates the parameter with matching definition and value to a rectangular extent.

If crs is set, and the original coordinate reference system of the parameter can be determined, then the extent will be automatically reprojected so that it is in the specified crs. In this case the extent of the reproject rectangle will be returned.

See also
parameterAsExtentGeometry()
parameterAsExtentCrs()
Since
QGIS 3.4

Definition at line 797 of file qgsprocessingparameters.cpp.

◆ parameterAsExtentCrs()

QgsCoordinateReferenceSystem QgsProcessingParameters::parameterAsExtentCrs ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
QgsProcessingContext context 
)
static

Returns the coordinate reference system associated with an extent parameter value.

See also
parameterAsExtent()

Definition at line 1030 of file qgsprocessingparameters.cpp.

◆ parameterAsExtentGeometry()

QgsGeometry QgsProcessingParameters::parameterAsExtentGeometry ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
QgsProcessingContext context,
const QgsCoordinateReferenceSystem crs = QgsCoordinateReferenceSystem() 
)
static

Evaluates the parameter with matching definition to a rectangular extent, and returns a geometry covering this extent.

If crs is set, and the original coordinate reference system of the parameter can be determined, then the extent will be automatically reprojected so that it is in the specified crs. Unlike parameterAsExtent(), the reprojected rectangle returned by this function will no longer be a rectangle itself (i.e. this method returns the geometry of the actual reprojected rectangle, while parameterAsExtent() returns just the extent of the reprojected rectangle).

See also
parameterAsExtent()
parameterAsExtentCrs()

Definition at line 912 of file qgsprocessingparameters.cpp.

◆ parameterAsFields() [1/2]

QStringList QgsProcessingParameters::parameterAsFields ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition to a list of fields.

Definition at line 1501 of file qgsprocessingparameters.cpp.

◆ parameterAsFields() [2/2]

QStringList QgsProcessingParameters::parameterAsFields ( const QgsProcessingParameterDefinition definition,
const QVariant &  value,
QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition and value to a list of fields.

Since
QGIS 3.4

Definition at line 1510 of file qgsprocessingparameters.cpp.

◆ parameterAsFile() [1/2]

QString QgsProcessingParameters::parameterAsFile ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition to a file/folder name.

Definition at line 1225 of file qgsprocessingparameters.cpp.

◆ parameterAsFile() [2/2]

QString QgsProcessingParameters::parameterAsFile ( const QgsProcessingParameterDefinition definition,
const QVariant &  value,
QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition and value to a file/folder name.

Since
QGIS 3.4

Definition at line 1236 of file qgsprocessingparameters.cpp.

◆ parameterAsFileList() [1/2]

QStringList QgsProcessingParameters::parameterAsFileList ( const QgsProcessingParameterDefinition definition,
const QVariant &  value,
QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition to a list of files (for QgsProcessingParameterMultipleLayers in QgsProcessing:TypeFile mode).

Since
QGIS 3.10

Definition at line 1381 of file qgsprocessingparameters.cpp.

◆ parameterAsFileList() [2/2]

QStringList QgsProcessingParameters::parameterAsFileList ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition to a list of files (for QgsProcessingParameterMultipleLayers in QgsProcessing:TypeFile mode).

Since
QGIS 3.10

Definition at line 1427 of file qgsprocessingparameters.cpp.

◆ parameterAsFileOutput() [1/2]

QString QgsProcessingParameters::parameterAsFileOutput ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition to a file based output destination.

Definition at line 719 of file qgsprocessingparameters.cpp.

◆ parameterAsFileOutput() [2/2]

QString QgsProcessingParameters::parameterAsFileOutput ( const QgsProcessingParameterDefinition definition,
const QVariant &  value,
QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition and value to a file based output destination.

Since
QGIS 3.4

Definition at line 729 of file qgsprocessingparameters.cpp.

◆ parameterAsInt() [1/2]

int QgsProcessingParameters::parameterAsInt ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
const QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition to a static integer value.

Definition at line 152 of file qgsprocessingparameters.cpp.

◆ parameterAsInt() [2/2]

int QgsProcessingParameters::parameterAsInt ( const QgsProcessingParameterDefinition definition,
const QVariant &  value,
const QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition and value to a static integer value.

Since
QGIS 3.4

Definition at line 160 of file qgsprocessingparameters.cpp.

◆ parameterAsInts() [1/2]

QList< int > QgsProcessingParameters::parameterAsInts ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
const QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition to a list of integer values.

Since
QGIS 3.4

Definition at line 194 of file qgsprocessingparameters.cpp.

◆ parameterAsInts() [2/2]

QList< int > QgsProcessingParameters::parameterAsInts ( const QgsProcessingParameterDefinition definition,
const QVariant &  value,
const QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition and value to a list of integer values.

Since
QGIS 3.4

Definition at line 202 of file qgsprocessingparameters.cpp.

◆ parameterAsLayer() [1/2]

QgsMapLayer * QgsProcessingParameters::parameterAsLayer ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition to a map layer.

Layers will either be taken from context's active project, or loaded from external sources and stored temporarily in the context. In either case, callers do not need to handle deletion of the returned layer.

Definition at line 573 of file qgsprocessingparameters.cpp.

◆ parameterAsLayer() [2/2]

QgsMapLayer * QgsProcessingParameters::parameterAsLayer ( const QgsProcessingParameterDefinition definition,
const QVariant &  value,
QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition and value to a map layer.

Layers will either be taken from context's active project, or loaded from external sources and stored temporarily in the context. In either case, callers do not need to handle deletion of the returned layer.

Since
QGIS 3.4

Definition at line 581 of file qgsprocessingparameters.cpp.

◆ parameterAsLayerList() [1/2]

QList< QgsMapLayer * > QgsProcessingParameters::parameterAsLayerList ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition to a list of map layers.

Definition at line 1286 of file qgsprocessingparameters.cpp.

◆ parameterAsLayerList() [2/2]

QList< QgsMapLayer * > QgsProcessingParameters::parameterAsLayerList ( const QgsProcessingParameterDefinition definition,
const QVariant &  value,
QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition and value to a list of map layers.

Since
QGIS 3.4

Definition at line 1294 of file qgsprocessingparameters.cpp.

◆ parameterAsLayout() [1/2]

QgsPrintLayout * QgsProcessingParameters::parameterAsLayout ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition to a print layout.

Warning
This method is not safe to run in a background thread, so it must either be used within a prepareAlgorithm implementation (which runs in the main thread), or the algorithm must return the FlagNoThreading flag.
Since
QGIS 3.8

Definition at line 1559 of file qgsprocessingparameters.cpp.

◆ parameterAsLayout() [2/2]

QgsPrintLayout * QgsProcessingParameters::parameterAsLayout ( const QgsProcessingParameterDefinition definition,
const QVariant &  value,
QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition and value to a print layout.

Warning
This method is not safe to run in a background thread, so it must either be used within a prepareAlgorithm implementation (which runs in the main thread), or the algorithm must return the FlagNoThreading flag.
Since
QGIS 3.8

Definition at line 1567 of file qgsprocessingparameters.cpp.

◆ parameterAsLayoutItem() [1/2]

QgsLayoutItem * QgsProcessingParameters::parameterAsLayoutItem ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
QgsProcessingContext context,
QgsPrintLayout layout 
)
static

Evaluates the parameter with matching definition to a print layout item, taken from the specified layout.

Warning
This method is not safe to run in a background thread, so it must either be used within a prepareAlgorithm implementation (which runs in the main thread), or the algorithm must return the FlagNoThreading flag.
Since
QGIS 3.8

Definition at line 1583 of file qgsprocessingparameters.cpp.

◆ parameterAsLayoutItem() [2/2]

QgsLayoutItem * QgsProcessingParameters::parameterAsLayoutItem ( const QgsProcessingParameterDefinition definition,
const QVariant &  value,
QgsProcessingContext context,
QgsPrintLayout layout 
)
static

Evaluates the parameter with matching definition and value to a print layout, taken from the specified layout.

Warning
This method is not safe to run in a background thread, so it must either be used within a prepareAlgorithm implementation (which runs in the main thread), or the algorithm must return the FlagNoThreading flag.
Since
QGIS 3.8

Definition at line 1591 of file qgsprocessingparameters.cpp.

◆ parameterAsMatrix() [1/2]

QVariantList QgsProcessingParameters::parameterAsMatrix ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition to a matrix/table of values.

Tables are collapsed to a 1 dimensional list.

Definition at line 1247 of file qgsprocessingparameters.cpp.

◆ parameterAsMatrix() [2/2]

QVariantList QgsProcessingParameters::parameterAsMatrix ( const QgsProcessingParameterDefinition definition,
const QVariant &  value,
QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition and value to a matrix/table of values.

Tables are collapsed to a 1 dimensional list.

Since
QGIS 3.4

Definition at line 1255 of file qgsprocessingparameters.cpp.

◆ parameterAsMeshLayer() [1/2]

QgsMeshLayer * QgsProcessingParameters::parameterAsMeshLayer ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition and value to a mesh layer.

Layers will either be taken from context's active project, or loaded from external sources and stored temporarily in the context. In either case, callers do not need to handle deletion of the returned layer.

Since
QGIS 3.6

Definition at line 640 of file qgsprocessingparameters.cpp.

◆ parameterAsMeshLayer() [2/2]

QgsMeshLayer * QgsProcessingParameters::parameterAsMeshLayer ( const QgsProcessingParameterDefinition definition,
const QVariant &  value,
QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition and value to a mesh layer.

Layers will either be taken from context's active project, or loaded from external sources and stored temporarily in the context. In either case, callers do not need to handle deletion of the returned layer.

Since
QGIS 3.6

Definition at line 645 of file qgsprocessingparameters.cpp.

◆ parameterAsOutputLayer() [1/2]

QString QgsProcessingParameters::parameterAsOutputLayer ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition to a output layer destination.

Definition at line 650 of file qgsprocessingparameters.cpp.

◆ parameterAsOutputLayer() [2/2]

QString QgsProcessingParameters::parameterAsOutputLayer ( const QgsProcessingParameterDefinition definition,
const QVariant &  value,
QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition and value to a output layer destination.

Since
QGIS 3.4

Definition at line 660 of file qgsprocessingparameters.cpp.

◆ parameterAsPoint() [1/2]

QgsPointXY QgsProcessingParameters::parameterAsPoint ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
QgsProcessingContext context,
const QgsCoordinateReferenceSystem crs = QgsCoordinateReferenceSystem() 
)
static

Evaluates the parameter with matching definition to a point.

If crs is set then the point will be automatically reprojected so that it is in the specified crs.

See also
parameterAsPointCrs()

Definition at line 1107 of file qgsprocessingparameters.cpp.

◆ parameterAsPoint() [2/2]

QgsPointXY QgsProcessingParameters::parameterAsPoint ( const QgsProcessingParameterDefinition definition,
const QVariant &  value,
QgsProcessingContext context,
const QgsCoordinateReferenceSystem crs = QgsCoordinateReferenceSystem() 
)
static

Evaluates the parameter with matching definition and value to a point.

If crs is set then the point will be automatically reprojected so that it is in the specified crs.

See also
parameterAsPointCrs()
Since
QGIS 3.4

Definition at line 1115 of file qgsprocessingparameters.cpp.

◆ parameterAsPointCrs() [1/2]

QgsCoordinateReferenceSystem QgsProcessingParameters::parameterAsPointCrs ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
QgsProcessingContext context 
)
static

Returns the coordinate reference system associated with an point parameter value.

See also
parameterAsPoint()

Definition at line 1191 of file qgsprocessingparameters.cpp.

◆ parameterAsPointCrs() [2/2]

QgsCoordinateReferenceSystem QgsProcessingParameters::parameterAsPointCrs ( const QgsProcessingParameterDefinition definition,
const QVariant &  value,
QgsProcessingContext context 
)
static

Returns the coordinate reference system associated with an point parameter value.

See also
parameterAsPoint()
Since
QGIS 3.8

Definition at line 1197 of file qgsprocessingparameters.cpp.

◆ parameterAsRange() [1/2]

QList< double > QgsProcessingParameters::parameterAsRange ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition to a range of values.

Definition at line 1435 of file qgsprocessingparameters.cpp.

◆ parameterAsRange() [2/2]

QList< double > QgsProcessingParameters::parameterAsRange ( const QgsProcessingParameterDefinition definition,
const QVariant &  value,
QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition and value to a range of values.

Since
QGIS 3.4

Definition at line 1443 of file qgsprocessingparameters.cpp.

◆ parameterAsRasterLayer() [1/2]

QgsRasterLayer * QgsProcessingParameters::parameterAsRasterLayer ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition to a raster layer.

Layers will either be taken from context's active project, or loaded from external sources and stored temporarily in the context. In either case, callers do not need to handle deletion of the returned layer.

Definition at line 630 of file qgsprocessingparameters.cpp.

◆ parameterAsRasterLayer() [2/2]

QgsRasterLayer * QgsProcessingParameters::parameterAsRasterLayer ( const QgsProcessingParameterDefinition definition,
const QVariant &  value,
QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition and value to a raster layer.

Layers will either be taken from context's active project, or loaded from external sources and stored temporarily in the context. In either case, callers do not need to handle deletion of the returned layer.

Since
QGIS 3.4

Definition at line 635 of file qgsprocessingparameters.cpp.

◆ parameterAsSink() [1/2]

QgsFeatureSink * QgsProcessingParameters::parameterAsSink ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
const QgsFields fields,
QgsWkbTypes::Type  geometryType,
const QgsCoordinateReferenceSystem crs,
QgsProcessingContext context,
QString &  destinationIdentifier,
QgsFeatureSink::SinkFlags  sinkFlags = nullptr 
)
static

Evaluates the parameter with matching definition to a feature sink.

The fields, geometryType and crs parameters dictate the properties of the resulting feature sink.

Sinks will either be taken from context's active project, or created from external providers and stored temporarily in the context. The destinationIdentifier argument will be set to a string which can be used to retrieve the layer corresponding to the sink, e.g. via calling QgsProcessingUtils::mapLayerFromString().

This function creates a new object and the caller takes responsibility for deleting the returned object.

Definition at line 390 of file qgsprocessingparameters.cpp.

◆ parameterAsSink() [2/2]

QgsFeatureSink * QgsProcessingParameters::parameterAsSink ( const QgsProcessingParameterDefinition definition,
const QVariant &  value,
const QgsFields fields,
QgsWkbTypes::Type  geometryType,
const QgsCoordinateReferenceSystem crs,
QgsProcessingContext context,
QString &  destinationIdentifier,
QgsFeatureSink::SinkFlags  sinkFlags = nullptr 
)
static

Evaluates the parameter with matching definition and value to a feature sink.

The fields, geometryType and crs parameters dictate the properties of the resulting feature sink.

Sinks will either be taken from context's active project, or created from external providers and stored temporarily in the context. The destinationIdentifier argument will be set to a string which can be used to retrieve the layer corresponding to the sink, e.g. via calling QgsProcessingUtils::mapLayerFromString().

This function creates a new object and the caller takes responsibility for deleting the returned object.

Since
QGIS 3.4

Definition at line 403 of file qgsprocessingparameters.cpp.

◆ parameterAsSource() [1/2]

QgsProcessingFeatureSource * QgsProcessingParameters::parameterAsSource ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition to a feature source.

Sources will either be taken from context's active project, or loaded from external sources and stored temporarily in the context.

This function creates a new object and the caller takes responsibility for deleting the returned object.

Definition at line 467 of file qgsprocessingparameters.cpp.

◆ parameterAsSource() [2/2]

QgsProcessingFeatureSource * QgsProcessingParameters::parameterAsSource ( const QgsProcessingParameterDefinition definition,
const QVariant &  value,
QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition and value to a feature source.

Sources will either be taken from context's active project, or loaded from external sources and stored temporarily in the context.

This function creates a new object and the caller takes responsibility for deleting the returned object.

Since
QGIS 3.4

Definition at line 475 of file qgsprocessingparameters.cpp.

◆ parameterAsString() [1/2]

QString QgsProcessingParameters::parameterAsString ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
const QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition to a static string value.

Definition at line 65 of file qgsprocessingparameters.cpp.

◆ parameterAsString() [2/2]

QString QgsProcessingParameters::parameterAsString ( const QgsProcessingParameterDefinition definition,
const QVariant &  value,
const QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition and value to a static string value.

Since
QGIS 3.4

Definition at line 73 of file qgsprocessingparameters.cpp.

◆ parameterAsVectorLayer() [1/2]

QgsVectorLayer * QgsProcessingParameters::parameterAsVectorLayer ( const QgsProcessingParameterDefinition definition,
const QVariantMap &  parameters,
QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition to a vector layer.

Layers will either be taken from context's active project, or loaded from external sources and stored temporarily in the context. In either case, callers do not need to handle deletion of the returned layer.

Definition at line 762 of file qgsprocessingparameters.cpp.

◆ parameterAsVectorLayer() [2/2]

QgsVectorLayer * QgsProcessingParameters::parameterAsVectorLayer ( const QgsProcessingParameterDefinition definition,
const QVariant &  value,
QgsProcessingContext context 
)
static

Evaluates the parameter with matching definition and value to a vector layer.

Layers will either be taken from context's active project, or loaded from external sources and stored temporarily in the context. In either case, callers do not need to handle deletion of the returned layer.

Since
QGIS 3.4

Definition at line 767 of file qgsprocessingparameters.cpp.

◆ parameterFromScriptCode()

QgsProcessingParameterDefinition * QgsProcessingParameters::parameterFromScriptCode ( const QString &  code)
static

Creates a new QgsProcessingParameterDefinition using the configuration from a supplied script code string.

The caller takes responsibility for deleting the returned object.

Definition at line 1739 of file qgsprocessingparameters.cpp.

◆ parameterFromVariantMap()

QgsProcessingParameterDefinition * QgsProcessingParameters::parameterFromVariantMap ( const QVariantMap &  map)
static

Creates a new QgsProcessingParameterDefinition using the configuration from a supplied variant map.

The caller takes responsibility for deleting the returned object.

Definition at line 1656 of file qgsprocessingparameters.cpp.


The documentation for this class was generated from the following files: