QGIS API Documentation  3.17.0-Master (ca637cfeb2)
qgsalgorithmpolygonstolines.h
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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  ***************************************************************************/
8 
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  ***************************************************************************/
17 
18 #ifndef QGSALGORITHMPOLYGONSTOLINES_H
19 #define QGSALGORITHMPOLYGONSTOLINES_H
20 
21 #define SIP_NO_FILE
22 
23 #include "qgis_sip.h"
24 #include "qgsprocessingalgorithm.h"
25 #include "qgsapplication.h"
26 
28 
32 class QgsPolygonsToLinesAlgorithm : public QgsProcessingFeatureBasedAlgorithm
33 {
34 
35  public:
36 
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;
49 
50  protected:
51  QString outputName() const override;
53  QgsWkbTypes::Type outputWkbType( QgsWkbTypes::Type inputWkbType ) const override;
54  QgsFeatureList processFeature( const QgsFeature &feature, QgsProcessingContext &context, QgsProcessingFeedback *feedback ) override;
55 
56  private:
57  QgsGeometry convertToLines( const QgsGeometry &geometry ) const;
58  QList<QgsCurve *> extractRings( const QgsAbstractGeometry *geom ) const;
59 };
60 
62 
63 #endif // QGSALGORITHMPOLYGONSTOLINES_H
64 
65 
virtual QString outputName() const =0
Returns the translated, user visible name for any layers created by this algorithm.
virtual QIcon icon() const
Returns an icon for the algorithm.
Base class for providing feedback from a processing algorithm.
virtual QgsFeatureList processFeature(const QgsFeature &feature, QgsProcessingContext &context, QgsProcessingFeedback *feedback) SIP_THROW(QgsProcessingException)=0
Processes an individual input feature from the source.
QList< QgsFeature > QgsFeatureList
Definition: qgsfeature.h:583
virtual QString name() const =0
Returns the algorithm name, used for identifying the algorithm.
virtual QString group() const
Returns the name of the group this algorithm belongs to.
static QString iconPath(const QString &iconFile)
Returns path to the desired icon file.
A geometry is the spatial representation of a feature.
Definition: qgsgeometry.h:123
static QIcon getThemeIcon(const QString &name)
Helper to get a theme icon.
virtual QStringList tags() const
Returns a list of tags which relate to the algorithm, and are used to assist users in searching for s...
The feature class encapsulates a single feature including its id, geometry and a list of field/values...
Definition: qgsfeature.h:55
virtual QList< int > inputLayerTypes() const
Returns the valid input layer types for the source layer for this algorithm.
virtual QString shortHelpString() const
Returns a localised short helper string for the algorithm.
Type
The WKB type describes the number of dimensions a geometry has.
Definition: qgswkbtypes.h:69
virtual QgsWkbTypes::Type outputWkbType(QgsWkbTypes::Type inputWkbType) const
Maps the input WKB geometry type (inputWkbType) to the corresponding output WKB type generated by the...
#define SIP_FACTORY
Definition: qgis_sip.h:76
Abstract base class for all geometries.
virtual QgsProcessingAlgorithm * createInstance() const =0
Creates a new instance of the algorithm class.
virtual QString displayName() const =0
Returns the translated algorithm name, which should be used for any user-visible display of the algor...
virtual QString shortDescription() const
Returns an optional translated short description of the algorithm.
SourceType
Data source types enum.
Definition: qgsprocessing.h:44
virtual QString groupId() const
Returns the unique ID of the group this algorithm belongs to.
An abstract QgsProcessingAlgorithm base class for processing algorithms which operate "feature-by-fea...
Contains information about the context in which a processing algorithm is executed.
virtual QgsProcessing::SourceType outputLayerType() const
Returns the layer type for layers generated by this algorithm, if this is possible to determine in ad...
virtual QString svgIconPath() const
Returns a path to an SVG version of the algorithm&#39;s icon.