QGIS API Documentation  3.21.0-Master (56b4176581)
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1 /***************************************************************************
2  qgsalgorithmpolygontolines.h
3  ---------------------
4  begin : January 2019
5  copyright : (C) 2019 by Matthias Kuhn
6  email : [email protected]
7  ***************************************************************************/
9 /***************************************************************************
10  * *
11  * This program is free software; you can redistribute it and/or modify *
12  * it under the terms of the GNU General Public License as published by *
13  * the Free Software Foundation; either version 2 of the License, or *
14  * (at your option) any later version. *
15  * *
16  ***************************************************************************/
21 #define SIP_NO_FILE
23 #include "qgis_sip.h"
24 #include "qgsprocessingalgorithm.h"
25 #include "qgsapplication.h"
32 class QgsPolygonsToLinesAlgorithm : public QgsProcessingFeatureBasedAlgorithm
33 {
35  public:
37  QgsPolygonsToLinesAlgorithm() = default;
38  QIcon icon() const override { return QgsApplication::getThemeIcon( QStringLiteral( "/algorithms/mAlgorithmPolygonToLine.svg" ) ); }
39  QString svgIconPath() const override { return QgsApplication::iconPath( QStringLiteral( "/algorithms/mAlgorithmPolygonToLine.svg" ) ); }
40  QString name() const override;
41  QString displayName() const override;
42  QStringList tags() const override;
43  QString group() const override;
44  QString groupId() const override;
45  QString shortHelpString() const override;
46  QString shortDescription() const override;
47  QgsPolygonsToLinesAlgorithm *createInstance() const override SIP_FACTORY;
48  QList<int> inputLayerTypes() const override;
50  protected:
51  QString outputName() const override;
52  QgsProcessing::SourceType outputLayerType() const override;
53  QgsWkbTypes::Type outputWkbType( QgsWkbTypes::Type inputWkbType ) const override;
54  QgsFeatureList processFeature( const QgsFeature &feature, QgsProcessingContext &context, QgsProcessingFeedback *feedback ) override;
56  private:
57  QgsGeometry convertToLines( const QgsGeometry &geometry ) const;
58  QList<QgsCurve *> extractRings( const QgsAbstractGeometry *geom ) const;
59 };
Abstract base class for all geometries.
static QIcon getThemeIcon(const QString &name, const QColor &fillColor=QColor(), const QColor &strokeColor=QColor())
Helper to get a theme icon.
static QString iconPath(const QString &iconFile)
Returns path to the desired icon file.
The feature class encapsulates a single feature including its unique ID, geometry and a list of field...
Definition: qgsfeature.h:56
A geometry is the spatial representation of a feature.
Definition: qgsgeometry.h:124
virtual QString group() const
Returns the name of the group this algorithm belongs to.
virtual QString groupId() const
Returns the unique ID of the group this algorithm belongs to.
virtual QIcon icon() const
Returns an icon for the algorithm.
virtual QString shortHelpString() const
Returns a localised short helper string for the algorithm.
virtual QString shortDescription() const
Returns an optional translated short description of the algorithm.
virtual QString displayName() const =0
Returns the translated algorithm name, which should be used for any user-visible display of the algor...
virtual QgsProcessingAlgorithm * createInstance() const =0
Creates a new instance of the algorithm class.
virtual QStringList tags() const
Returns a list of tags which relate to the algorithm, and are used to assist users in searching for s...
virtual QString svgIconPath() const
Returns a path to an SVG version of the algorithm's icon.
virtual QString name() const =0
Returns the algorithm name, used for identifying the algorithm.
Contains information about the context in which a processing algorithm is executed.
An abstract QgsProcessingAlgorithm base class for processing algorithms which operate "feature-by-fea...
Base class for providing feedback from a processing algorithm.
Data source types enum.
Definition: qgsprocessing.h:46
The WKB type describes the number of dimensions a geometry has.
Definition: qgswkbtypes.h:70
Definition: qgis_sip.h:76
QList< QgsFeature > QgsFeatureList
Definition: qgsfeature.h:834