QGIS API Documentation  3.4.15-Madeira (e83d02e274)
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 
23 QString QgsMultipartToSinglepartAlgorithm::name() const
24 {
25  return QStringLiteral( "multiparttosingleparts" );
26 }
27 
28 QString QgsMultipartToSinglepartAlgorithm::displayName() const
29 {
30  return QObject::tr( "Multipart to singleparts" );
31 }
32 
33 QString QgsMultipartToSinglepartAlgorithm::outputName() const
34 {
35  return QObject::tr( "Single parts" );
36 }
37 
38 QgsWkbTypes::Type QgsMultipartToSinglepartAlgorithm::outputWkbType( QgsWkbTypes::Type inputWkbType ) const
39 {
40  return QgsWkbTypes::singleType( inputWkbType );
41 }
42 
43 QStringList QgsMultipartToSinglepartAlgorithm::tags() const
44 {
45  return QObject::tr( "multi,single,multiple,split,dump" ).split( ',' );
46 }
47 
48 QString QgsMultipartToSinglepartAlgorithm::group() const
49 {
50  return QObject::tr( "Vector geometry" );
51 }
52 
53 QString QgsMultipartToSinglepartAlgorithm::groupId() const
54 {
55  return QStringLiteral( "vectorgeometry" );
56 }
57 
58 QString 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 
65 QgsMultipartToSinglepartAlgorithm *QgsMultipartToSinglepartAlgorithm::createInstance() const
66 {
67  return new QgsMultipartToSinglepartAlgorithm();
68 }
69 
70 
71 QgsProcessingFeatureSource::Flag QgsMultipartToSinglepartAlgorithm::sourceFlags() const
72 {
73  // skip geometry checks - this algorithm can be used to repair geometries
75 }
76 
77 QgsFeatureSink::SinkFlags QgsMultipartToSinglepartAlgorithm::sinkFlags() const
78 {
80 }
81 
82 QgsFeatureList QgsMultipartToSinglepartAlgorithm::processFeature( const QgsFeature &feature, QgsProcessingContext &, QgsProcessingFeedback * )
83 {
84  if ( !feature.hasGeometry() )
85  return QgsFeatureList() << feature;
86 
87  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 
static Type singleType(Type type)
Returns the single type for a WKB type.
Definition: qgswkbtypes.h:154
Base class for providing feedback from a processing algorithm.
Invalid geometry checks should always be skipped. This flag can be useful for algorithms which always...
QList< QgsFeature > QgsFeatureList
Definition: qgsfeature.h:571
A geometry is the spatial representation of a feature.
Definition: qgsgeometry.h:106
void setAttributes(const QgsAttributes &attrs)
Sets the feature&#39;s attributes.
Definition: qgsfeature.cpp:127
The feature class encapsulates a single feature including its id, geometry and a list of field/values...
Definition: qgsfeature.h:55
This flag indicates, that a primary key field cannot be guaranteed to be unique and the sink should i...
Type
The WKB type describes the number of dimensions a geometry has.
Definition: qgswkbtypes.h:68
QVector< QgsGeometry > asGeometryCollection() const
Returns contents of the geometry as a list of geometries.
Flag
Flags controlling how QgsProcessingFeatureSource fetches features.
bool isMultipart() const
Returns true if WKB of the geometry is of WKBMulti* type.
void setGeometry(const QgsGeometry &geometry)
Set the feature&#39;s geometry.
Definition: qgsfeature.cpp:137
bool hasGeometry() const
Returns true if the feature has an associated geometry.
Definition: qgsfeature.cpp:197
QgsGeometry geometry
Definition: qgsfeature.h:67
Contains information about the context in which a processing algorithm is executed.
QgsAttributes attributes
Definition: qgsfeature.h:65