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24.1.9. Modeler tools

Ostrzeżenie

These tools are only available in the model designer. They are not available in the Processing Toolbox.

24.1.9.1. Calculate expression

It calculates the result of a QGIS expression and eliminates the need to use the same expression multiple times throughout a model when the same result is required more than once. Additionally, it enables use cases that would otherwise not be possible. For instance, you can generate a timestamp value once and use it multiple times within the model, if the timestamp were recalculated every time, the values would vary during the model’s runtime.

Parametry

Etykieta	Nazwa	Typ	Opis
Input	INPUT	[wyrażenie]	Expression to calculate

Wyniki

Etykieta	Nazwa	Typ	Opis
Wartość	OUTPUT	[Result Value]	Calculated result value, the data type of the output will vary based on the specific expression used in the algorithm.

Kod pythona

ID algorytmu: native:calculateexpression

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.

24.1.9.2. Conditional branch

Adds a conditional branch into a model, allowing parts of the model to be executed based on the result of an expression evaluation. Mostly by using tool dependencies to control the flow of a model.

Parametry

Etykieta	Nazwa	Typ	Opis
Pole	BRANCH	[ciąg tekstowy]	Name of the condition
Pole	CONDITION	[wyrażenie]	Expression to evaluate

Wyniki

None.

Kod pythona

ID algorytmu: native:condition

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.

24.1.9.3. Create directory

Creates a new directory on a file system. Directories will be created recursively, creating all required parent directories in order to construct the full specified directory path. No errors will be raised if the directory already exists.

Parametry

Etykieta	Nazwa	Typ	Opis
Directory path	PATH	[ciąg tekstowy]	Folder path to create

Wyniki

Etykieta	Nazwa	Typ	Opis
Wynik	OUTPUT	[folder]	Created folder

Kod pythona

ID algorytmu: native:createdirectory

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.

24.1.9.4. Feature filter

Filters features from the input layer and redirects them to one or several outputs. If you do not know about any attribute names that are common to all possible input layers, filtering is only possible on the feature geometry and general record mechanisms, such as $id and uuid.

Parametry

Etykieta	Nazwa	Typ	Opis
Warstwa wejściowa	INPUT	[vector: any]	The input layer.
Outputs and filters (one or more)	OUTPUT_<name of the filter>	[same as input]	The output layers with filters (as many as there are filters).

Wyniki

Etykieta	Nazwa	Typ	Opis
Wynik (one or more)	native:filter_1:OUTPUT_<name of filter>	[same as input]	The output layers with filtered features (as many as there are filters).

Kod pythona

ID algorytmu: native:filter

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.

24.1.9.5. Filter layers by type

Filters layers by their type. Incoming layers will be directed to different outputs based on whether they are a vector or raster layer.

Parametry

Etykieta	Nazwa	Typ	Opis
Warstwa wejściowa	INPUT	[warstwa]	Generic Map Layer

Wyniki

Etykieta	Nazwa	Typ	Opis
Vector features Opcjonalne	VECTOR	[wektor]	A Vector Layer of the input, if compatible
Raster layer Opcjonalne	RASTER	[raster]	A Raster Layer of the input, if compatible

Kod pythona

ID algorytmu: native:filterlayersbytype

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.

24.1.9.6. Load layer into project

Loads a layer to the current project.

Parametry

Etykieta	Nazwa	Typ	Opis
Warstwa	INPUT	[warstwa]	Layer to load in the legend
Loaded layer name	NAME	[ciąg tekstowy]	Name of the loaded layer

Wyniki

Etykieta	Nazwa	Typ	Opis
Warstwa	OUTPUT	[same as input]	The (renamed) loaded layer

Kod pythona

ID algorytmu: native:loadlayer

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.

24.1.9.7. Raise exception

Raises an exception and cancels a model’s execution. The exception message can be customized, and optionally an expression based condition can be specified. If an expression condition is used, then the exception will only be raised if the expression result is true. A false result indicates that no exception will be raised, and the model execution can continue uninterrupted.

Parametry

Etykieta	Nazwa	Typ	Opis
Message	MESSAGE	[ciąg tekstowy]	Message to display
Condition Opcjonalne	CONDITION	[wyrażenie]	Expression to evaluate if true

Wyniki

A message in the log panel.

Kod pythona

ID algorytmu: native:raiseexception

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.

24.1.9.8. Raise message

Raises an information message in the log. The message can be customized, and optionally an expression based condition can be specified. If an expression condition is used, then the message will only be logged if the expression result is true. A false result indicates that no message will be logged.

Parametry

Etykieta	Nazwa	Typ	Opis
Information message	MESSAGE	[ciąg tekstowy]	Message to display
Condition Opcjonalne	CONDITION	[wyrażenie]	Expression to evaluate if true

Wyniki

A message in the log panel.

Kod pythona

ID algorytmu: native:raisemessage

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.

24.1.9.9. Raise warning

Raises a warning message in the log. The warning message can be customized, and optionally an expression based condition can be specified. If an expression condition is used, then the warning will only be logged if the expression result is true. A false result indicates that no warning will be logged.

Parametry

Etykieta	Nazwa	Typ	Opis
Message	MESSAGE	[ciąg tekstowy]	Message to display
Condition Opcjonalne	CONDITION	[wyrażenie]	Expression to evaluate if true

Wyniki

A message in the log panel.

Kod pythona

ID algorytmu: native:raisewarning

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.

24.1.9.10. Rename layer

Renames a layer.

Parametry

Etykieta	Nazwa	Typ	Opis
Warstwa	INPUT	[warstwa]	Layer to rename
New name	NAME	[ciąg tekstowy]	The new name of the layer

Wyniki

Etykieta	Nazwa	Typ	Opis
Warstwa	OUTPUT	[same as input]	The (renamed) output layer

Kod pythona

ID algorytmu: native:renamelayer

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.

24.1.9.11. Save log to file

Saves the model’s execution log to a file. Optionally, the log can be saved in a HTML formatted version.

Parametry

Etykieta	Nazwa	Typ	Opis
Use HTML	USE_HTML	[wartość logiczna] Domyślnie: False	Use HTML formatting

Wyniki

Etykieta	Nazwa	Typ	Opis
File	OUTPUT	[ciąg tekstowy]	Destination of the log

Kod pythona

ID algorytmu: native:savelog

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.

24.1.9.12. Set project variable

Sets an expression variable for the current project.

Parametry

Etykieta	Nazwa	Typ	Opis
Variable name	NAME	[ciąg tekstowy]	Name of the variable
Variable value	VALUE	[ciąg tekstowy]	Value to be stored

Wyniki

None.

Kod pythona

ID algorytmu: native:setprojectvariable

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.

24.1.9.13. String concatenation

Concatenates two strings into a single one in the Processing Modeler.

Parametry

Etykieta	Nazwa	Typ	Opis
Input 1	INPUT_1	[ciąg tekstowy]	First string
Input 2	INPUT_2	[ciąg tekstowy]	Second string

Wyniki

Etykieta	Nazwa	Typ	Opis
Concatenation	CONCATENATION	[ciąg tekstowy]	The concatenated string

Kod pythona

ID algorytmu: native:stringconcatenation

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.

24.1.9.14. Variable distance buffer

Ostrzeżenie

This algorithm is deprecated and can be removed anytime. Prefer using Buffer algorithm instead.

Computes a buffer area for all the features in an input layer.

The size of the buffer for a given feature is defined by an attribute, so it allows different features to have different buffer sizes.

Zobacz także

Buffer

Parametry

Etykieta	Nazwa	Typ	Opis
Warstwa wejściowa	INPUT	[vector: any]	Input vector layer
Distance field	DISTANCE	[tablefield: numeric]	Attribute for the distance radius of the buffer
Segmenty	SEGMENTS	[numeric: integer] Domyślnie: 5	Controls the number of line segments to use to approximate a quarter circle when creating rounded offsets.
Dissolve result	DISSOLVE	[wartość logiczna] Default: False	Choose to dissolve the final buffer, resulting in a single feature covering all input features. Rys. 24.8 Normal and dissolved buffer
End cap style	END_CAP_STYLE	[wyliczenie] Default: Round	Controls how line endings are handled in the buffer. Rys. 24.9 Round, flat and square cap styles
Join style	JOIN_STYLE	[wyliczenie] Default: Round	Specifies whether round, miter or beveled joins should be used when offsetting corners in a line.
Miter limit	MITER_LIMIT	[numeric: double] Domyślnie: 2.0	Only applicable for mitered join styles, and controls the maximum distance from the offset curve to use when creating a mitered join.

Wyniki

Etykieta	Nazwa	Typ	Opis
Bufor	OUTPUT	[vector: polygon]	Buffer polygon vector layer.

Kod pythona

ID algorytmu: qgis:variabledistancebuffer

import processing
processing.run("algorithm_id", {parameter_dictionary})

The algorithm id is displayed when you hover over the algorithm in the Processing Toolbox. The parameter dictionary provides the parameter NAMEs and values. See Using processing algorithms from the console for details on how to run processing algorithms from the Python console.