QGIS API Documentation 3.37.0-Master (fdefdf9c27f)
qgsalgorithmmultiparttosinglepart.cpp
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1/***************************************************************************
2 qgsalgorithmmultiparttosinglepart.cpp
3 ---------------------
4 begin : April 2017
5 copyright : (C) 2017 by Nyall Dawson
6 email : nyall dot dawson at gmail dot com
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
19#include "qgsvectorlayer.h"
20
22
23QString QgsMultipartToSinglepartAlgorithm::name() const
24{
25 return QStringLiteral( "multiparttosingleparts" );
26}
27
28QString QgsMultipartToSinglepartAlgorithm::displayName() const
29{
30 return QObject::tr( "Multipart to singleparts" );
31}
32
33QString QgsMultipartToSinglepartAlgorithm::outputName() const
34{
35 return QObject::tr( "Single parts" );
36}
37
38Qgis::WkbType QgsMultipartToSinglepartAlgorithm::outputWkbType( Qgis::WkbType inputWkbType ) const
39{
40 return QgsWkbTypes::singleType( inputWkbType );
41}
42
43QStringList QgsMultipartToSinglepartAlgorithm::tags() const
44{
45 return QObject::tr( "multi,single,multiple,split,dump" ).split( ',' );
46}
47
48QString QgsMultipartToSinglepartAlgorithm::group() const
49{
50 return QObject::tr( "Vector geometry" );
51}
52
53QString QgsMultipartToSinglepartAlgorithm::groupId() const
54{
55 return QStringLiteral( "vectorgeometry" );
56}
57
58QString QgsMultipartToSinglepartAlgorithm::shortHelpString() const
59{
60 return QObject::tr( "This algorithm takes a vector layer with multipart geometries and generates a new one in which all geometries contain "
61 "a single part. Features with multipart geometries are divided in as many different features as parts the geometry "
62 "contain, and the same attributes are used for each of them." );
63}
64
65QgsMultipartToSinglepartAlgorithm *QgsMultipartToSinglepartAlgorithm::createInstance() const
66{
67 return new QgsMultipartToSinglepartAlgorithm();
68}
69
70
71Qgis::ProcessingFeatureSourceFlags QgsMultipartToSinglepartAlgorithm::sourceFlags() const
72{
73 // skip geometry checks - this algorithm can be used to repair geometries
75}
76
77QgsFeatureSink::SinkFlags QgsMultipartToSinglepartAlgorithm::sinkFlags() const
78{
80}
81
82QgsFeatureList QgsMultipartToSinglepartAlgorithm::processFeature( const QgsFeature &feature, QgsProcessingContext &, QgsProcessingFeedback * )
83{
84 if ( !feature.hasGeometry() )
85 return QgsFeatureList() << feature;
86
87 const QgsGeometry inputGeometry = feature.geometry();
88 QgsFeatureList outputs;
89 if ( inputGeometry.isMultipart() )
90 {
91 const QVector<QgsGeometry> parts = inputGeometry.asGeometryCollection();
92 for ( const QgsGeometry &g : parts )
93 {
94 QgsFeature out;
95 out.setAttributes( feature.attributes() );
96 out.setGeometry( g );
97 outputs.append( out );
98 }
99 }
100 else
101 {
102 outputs.append( feature );
103 }
104 return outputs;
105}
106
107
109
110
@ SkipGeometryValidityChecks
Invalid geometry checks should always be skipped. This flag can be useful for algorithms which always...
WkbType
The WKB type describes the number of dimensions a geometry has.
Definition: qgis.h:182
QFlags< ProcessingFeatureSourceFlag > ProcessingFeatureSourceFlags
Flags which control how QgsProcessingFeatureSource fetches features.
Definition: qgis.h:3011
QFlags< SinkFlag > SinkFlags
@ RegeneratePrimaryKey
This flag indicates, that a primary key field cannot be guaranteed to be unique and the sink should i...
The feature class encapsulates a single feature including its unique ID, geometry and a list of field...
Definition: qgsfeature.h:56
QgsAttributes attributes
Definition: qgsfeature.h:65
void setAttributes(const QgsAttributes &attrs)
Sets the feature's attributes.
Definition: qgsfeature.cpp:160
QgsGeometry geometry
Definition: qgsfeature.h:67
bool hasGeometry() const
Returns true if the feature has an associated geometry.
Definition: qgsfeature.cpp:230
void setGeometry(const QgsGeometry &geometry)
Set the feature's geometry.
Definition: qgsfeature.cpp:167
A geometry is the spatial representation of a feature.
Definition: qgsgeometry.h:162
QVector< QgsGeometry > asGeometryCollection() const
Returns contents of the geometry as a list of geometries.
bool isMultipart() const
Returns true if WKB of the geometry is of WKBMulti* type.
Contains information about the context in which a processing algorithm is executed.
Base class for providing feedback from a processing algorithm.
static Qgis::WkbType singleType(Qgis::WkbType type)
Returns the single type for a WKB type.
Definition: qgswkbtypes.h:53
QList< QgsFeature > QgsFeatureList
Definition: qgsfeature.h:917