24QString QgsPixelCentroidsFromPolygonsAlgorithm::name()
const
26 return QStringLiteral(
"generatepointspixelcentroidsinsidepolygons" );
29QString QgsPixelCentroidsFromPolygonsAlgorithm::displayName()
const
31 return QObject::tr(
"Generate points (pixel centroids) inside polygons" );
34QStringList QgsPixelCentroidsFromPolygonsAlgorithm::tags()
const
36 return QObject::tr(
"raster,polygon,centroid,pixel,create" ).split(
',' );
39QString QgsPixelCentroidsFromPolygonsAlgorithm::group()
const
41 return QObject::tr(
"Vector creation" );
44QString QgsPixelCentroidsFromPolygonsAlgorithm::groupId()
const
46 return QStringLiteral(
"vectorcreation" );
49QString QgsPixelCentroidsFromPolygonsAlgorithm::shortHelpString()
const
51 return QObject::tr(
"Generates pixel centroids for the raster area falling inside polygons. Used to generate points "
52 "for further raster sampling." );
55QgsPixelCentroidsFromPolygonsAlgorithm *QgsPixelCentroidsFromPolygonsAlgorithm::createInstance()
const
57 return new QgsPixelCentroidsFromPolygonsAlgorithm();
60void QgsPixelCentroidsFromPolygonsAlgorithm::initAlgorithm(
const QVariantMap & )
70 QgsRasterLayer *rasterLayer = parameterAsRasterLayer( parameters, QStringLiteral(
"INPUT_RASTER" ), context );
75 std::unique_ptr< QgsProcessingFeatureSource > source( parameterAsSource( parameters, QStringLiteral(
"INPUT_VECTOR" ), context ) );
80 fields.
append(
QgsField( QStringLiteral(
"id" ), QVariant::LongLong ) );
81 fields.
append(
QgsField( QStringLiteral(
"poly_id" ), QVariant::Int ) );
82 fields.
append(
QgsField( QStringLiteral(
"point_id" ), QVariant::Int ) );
89 const double step = source->featureCount() ? 100.0 / source->featureCount() : 1;
117 const double xMin = bbox.
xMinimum();
118 const double xMax = bbox.
xMaximum();
119 const double yMin = bbox.
yMinimum();
120 const double yMax = bbox.
yMaximum();
123 int startRow, startColumn;
124 int endRow, endColumn;
125 QgsRasterAnalysisUtils::mapToPixel( xMin, yMax, extent, xPixel, yPixel, startRow, startColumn );
126 QgsRasterAnalysisUtils::mapToPixel( xMax, yMin, extent, xPixel, yPixel, endRow, endColumn );
129 engine->prepareGeometry();
131 for (
int row = startRow; row <= endRow; row++ )
133 for (
int col = startColumn; col <= endColumn; col++ )
140 QgsRasterAnalysisUtils::pixelToMap( row, col, extent, xPixel, yPixel, x, y );
143 if ( engine->contains( geom.constGet() ) )
163 outputs.insert( QStringLiteral(
"OUTPUT" ), dest );
@ VectorPoint
Vector point layers.
@ VectorPolygon
Vector polygon layers.
Wrapper for iterator of features from vector data provider or vector layer.
bool nextFeature(QgsFeature &f)
Fetch next feature and stores in f, returns true on success.
This class wraps a request for features to a vector layer (or directly its vector data provider).
QgsFeatureRequest & setSubsetOfAttributes(const QgsAttributeList &attrs)
Set a subset of attributes that will be fetched.
@ FastInsert
Use faster inserts, at the cost of updating the passed features to reflect changes made at the provid...
@ 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...
void setAttributes(const QgsAttributes &attrs)
Sets the feature's attributes.
void setFields(const QgsFields &fields, bool initAttributes=false)
Assigns a field map with the feature to allow attribute access by attribute name.
bool hasGeometry() const
Returns true if the feature has an associated geometry.
void setGeometry(const QgsGeometry &geometry)
Set the feature's geometry.
bool isCanceled() const
Tells whether the operation has been canceled already.
void setProgress(double progress)
Sets the current progress for the feedback object.
Encapsulate a field in an attribute table or data source.
Container of fields for a vector layer.
bool append(const QgsField &field, FieldOrigin origin=OriginProvider, int originIndex=-1)
Appends a field. The field must have unique name, otherwise it is rejected (returns false)
A geometry is the spatial representation of a feature.
const QgsAbstractGeometry * constGet() const
Returns a non-modifiable (const) reference to the underlying abstract geometry primitive.
QgsRectangle boundingBox() const
Returns the bounding box of the geometry.
static QgsGeometryEngine * createGeometryEngine(const QgsAbstractGeometry *geometry, double precision=0.0)
Creates and returns a new geometry engine representing the specified geometry using precision on a gr...
virtual QgsRectangle extent() const
Returns the extent of the layer.
QgsCoordinateReferenceSystem crs
Point geometry type, with support for z-dimension and m-values.
Contains information about the context in which a processing algorithm is executed.
QgsCoordinateTransformContext transformContext() const
Returns the coordinate transform context.
Custom exception class for processing related exceptions.
Base class for providing feedback from a processing algorithm.
A feature sink output for processing algorithms.
An input feature source (such as vector layers) parameter for processing algorithms.
A raster layer parameter for processing algorithms.
Represents a raster layer.
double rasterUnitsPerPixelX() const
Returns the number of raster units per each raster pixel in X axis.
double rasterUnitsPerPixelY() const
Returns the number of raster units per each raster pixel in Y axis.
A rectangle specified with double values.
double xMinimum() const
Returns the x minimum value (left side of rectangle).
double yMinimum() const
Returns the y minimum value (bottom side of rectangle).
double xMaximum() const
Returns the x maximum value (right side of rectangle).
double yMaximum() const
Returns the y maximum value (top side of rectangle).