23QString QgsCentroidAlgorithm::name()
const
25 return QStringLiteral(
"centroids" );
28QString QgsCentroidAlgorithm::displayName()
const
30 return QObject::tr(
"Centroids" );
33QStringList QgsCentroidAlgorithm::tags()
const
35 return QObject::tr(
"centroid,center,average,point,middle" ).split(
',' );
38QString QgsCentroidAlgorithm::group()
const
40 return QObject::tr(
"Vector geometry" );
43QString QgsCentroidAlgorithm::groupId()
const
45 return QStringLiteral(
"vectorgeometry" );
48QString QgsCentroidAlgorithm::outputName()
const
50 return QObject::tr(
"Centroids" );
61QString QgsCentroidAlgorithm::shortHelpString()
const
63 return QObject::tr(
"This algorithm creates a new point layer, with points representing the centroid of the geometries in an input layer.\n\n"
64 "The attributes associated to each point in the output layer are the same ones associated to the original features." );
72QgsCentroidAlgorithm *QgsCentroidAlgorithm::createInstance()
const
74 return new QgsCentroidAlgorithm();
77void QgsCentroidAlgorithm::initParameters(
const QVariantMap & )
79 std::unique_ptr< QgsProcessingParameterBoolean> allParts = std::make_unique< QgsProcessingParameterBoolean >(
80 QStringLiteral(
"ALL_PARTS" ),
81 QObject::tr(
"Create centroid for each part" ),
83 allParts->setIsDynamic(
true );
85 allParts->setDynamicLayerParameterName( QStringLiteral(
"INPUT" ) );
86 addParameter( allParts.release() );
91 mAllParts = parameterAsBoolean( parameters, QStringLiteral(
"ALL_PARTS" ), context );
93 if ( mDynamicAllParts )
94 mAllPartsProperty = parameters.value( QStringLiteral(
"ALL_PARTS" ) ).value<
QgsProperty >();
107 bool allParts = mAllParts;
108 if ( mDynamicAllParts )
109 allParts = mAllPartsProperty.valueAsBool( context.
expressionContext(), allParts );
115 const int partCount = geomCollection->
partCount();
116 list.reserve( partCount );
117 for (
int i = 0; i < partCount; ++i )
121 if ( outputGeometry.
isNull() )
123 feedback->
reportError( QObject::tr(
"Error calculating centroid for feature %1 part %2: %3" ).arg( feature.
id() ).arg( i ).arg( outputGeometry.
lastError() ) );
132 if ( outputGeometry.
isNull() )
134 feedback->
reportError( QObject::tr(
"Error calculating centroid for feature %1: %2" ).arg( feature.
id() ).arg( outputGeometry.
lastError() ) );
@ RegeneratesPrimaryKeyInSomeScenarios
Algorithm may drop the existing primary keys or FID values in some scenarios, depending on algorithm ...
QFlags< ProcessingAlgorithmDocumentationFlag > ProcessingAlgorithmDocumentationFlags
Flags describing algorithm behavior for documentation purposes.
virtual QgsAbstractGeometry * clone() const =0
Clones the geometry by performing a deep copy.
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...
bool hasGeometry() const
Returns true if the feature has an associated geometry.
void setGeometry(const QgsGeometry &geometry)
Set the feature's geometry.
int partCount() const override
Returns count of parts contained in the geometry.
const QgsAbstractGeometry * geometryN(int n) const
Returns a const reference to a geometry from within the collection.
A geometry is the spatial representation of a feature.
QString lastError() const
Returns an error string referring to the last error encountered either when this geometry was created...
const QgsAbstractGeometry * constGet() const
Returns a non-modifiable (const) reference to the underlying abstract geometry primitive.
bool isMultipart() const
Returns true if WKB of the geometry is of WKBMulti* type.
QgsGeometry centroid() const
Returns the center of mass of a geometry.
bool isEmpty() const
Returns true if the geometry is empty (eg a linestring with no vertices, or a collection with no geom...
Contains information about the context in which a processing algorithm is executed.
QgsExpressionContext & expressionContext()
Returns the expression context.
virtual QgsFeatureSink::SinkFlags sinkFlags() const
Returns the feature sink flags to be used for the output.
Base class for providing feedback from a processing algorithm.
virtual void reportError(const QString &error, bool fatalError=false)
Reports that the algorithm encountered an error while executing.
static bool isDynamic(const QVariantMap ¶meters, const QString &name)
Returns true if the parameter with matching name is a dynamic parameter, and must be evaluated once f...
Definition for a property.
A store for object properties.
QList< QgsFeature > QgsFeatureList