Implements a derived label provider for rule based labels internally used for DXF export. More...

#include <qgsdxfpallabeling.h>

Inheritance diagram for QgsDxfRuleBasedLabelProvider:

Public Member Functions
	QgsDxfRuleBasedLabelProvider (const QgsRuleBasedLabeling &rules, QgsVectorLayer layer, QgsDxfExport dxf)
	construct the provider More...

QgsVectorLayerLabelProvider *	createProvider (QgsVectorLayer layer, const QString &providerId, bool withFeatureLoop, const QgsPalLayerSettings settings) override
	create QgsDxfLabelProvider More...

void	drawLabel (QgsRenderContext &context, pal::LabelPosition *label) const override
	Re-implementation that writes to DXF file instead of drawing with QPainter. More...

void	registerDxfFeature (QgsFeature &feature, QgsRenderContext &context, const QString &dxfLayerName)
	Registration method that keeps track of DXF layer names of individual features. More...

void	reinit (QgsVectorLayer *layer)
	Reinitialize the subproviders with QgsDxfLabelProviders. More...

Public Member Functions inherited from QgsRuleBasedLabelProvider
	QgsRuleBasedLabelProvider (const QgsRuleBasedLabeling &rules, QgsVectorLayer *layer, bool withFeatureLoop=true)

bool	prepare (QgsRenderContext &context, QSet< QString > &attributeNames) override
	Prepare for registration of features. More...

void	registerFeature (const QgsFeature &feature, QgsRenderContext &context, const QgsGeometry &obstacleGeometry=QgsGeometry(), const QgsSymbol *symbol=nullptr) override
	Register a feature for labeling as one or more QgsLabelFeature objects stored into mLabels. More...

QList< QgsAbstractLabelProvider * >	subProviders () override
	Returns subproviders. More...

Public Member Functions inherited from QgsVectorLayerLabelProvider
	QgsVectorLayerLabelProvider (QgsVectorLayer layer, const QString &providerId, bool withFeatureLoop, const QgsPalLayerSettings settings, const QString &layerName=QString())
	Convenience constructor to initialize the provider from given vector layer. More...

	~QgsVectorLayerLabelProvider () override

void	drawLabelBackground (QgsRenderContext &context, pal::LabelPosition *label) const override
	Draw the background for the specified label. More...

void	drawUnplacedLabel (QgsRenderContext &context, pal::LabelPosition *label) const override
	Draw an unplaced label. More...

QList< QgsLabelFeature * >	labelFeatures (QgsRenderContext &context) override
	Returns list of label features (they are owned by the provider and thus deleted on its destruction) More...

const QgsPalLayerSettings &	settings () const
	Returns the layer's settings. More...

void	startRender (QgsRenderContext &context) override
	To be called before rendering of labels begins. More...

void	stopRender (QgsRenderContext &context) override
	To be called after rendering is complete. More...

Public Member Functions inherited from QgsAbstractLabelProvider
	QgsAbstractLabelProvider (QgsMapLayer *layer, const QString &providerId=QString())
	Construct the provider with default values. More...

virtual	~QgsAbstractLabelProvider ()=default

Flags	flags () const
	Flags associated with the provider. More...

QgsMapLayer *	layer () const
	Returns the associated layer, or `nullptr` if no layer is associated with the provider. More...

QString	layerId () const
	Returns ID of associated layer, or empty string if no layer is associated with the provider. More...

QString	name () const
	Name of the layer (for statistics, debugging etc.) - does not need to be unique. More...

QgsPalLayerSettings::ObstacleType	obstacleType () const
	How the feature geometries will work as obstacles. More...

QgsPalLayerSettings::Placement	placement () const
	What placement strategy to use for the labels. More...

double	priority () const
	Default priority of labels (may be overridden by individual labels) More...

QString	providerId () const
	Returns provider ID - useful in case there is more than one label provider within a layer (e.g. More...

void	setEngine (const QgsLabelingEngine *engine)
	Associate provider with a labeling engine (should be only called internally from QgsLabelingEngine) More...

QgsPalLayerSettings::UpsideDownLabels	upsidedownLabels () const
	How to handle labels that would be upside down. More...

Protected Attributes
QgsDxfExport *	mDxfExport = nullptr
	pointer to parent DXF export where this instance is used More...

Protected Attributes inherited from QgsRuleBasedLabelProvider
std::unique_ptr< QgsRuleBasedLabeling >	mRules
	owned copy More...

QgsRuleBasedLabeling::RuleToProviderMap	mSubProviders
	label providers are owned by labeling engine More...

Protected Attributes inherited from QgsVectorLayerLabelProvider
QgsCoordinateReferenceSystem	mCrs
	Layer's CRS. More...

QgsFields	mFields
	Layer's fields. More...

QList< QgsLabelFeature * >	mLabels
	List of generated. More...

QgsWkbTypes::GeometryType	mLayerGeometryType
	Geometry type of layer. More...

QgsFeatureRenderer *	mRenderer = nullptr

QgsPalLayerSettings	mSettings
	Layer's labeling configuration. More...

std::unique_ptr< QgsAbstractFeatureSource >	mSource
	Layer's feature source. More...

Protected Attributes inherited from QgsAbstractLabelProvider
const QgsLabelingEngine *	mEngine = nullptr
	Associated labeling engine. More...

Flags	mFlags
	Flags altering drawing and registration of features. More...

QgsWeakMapLayerPointer	mLayer
	Weak pointer to source layer. More...

QString	mLayerId
	Associated layer's ID, if applicable. More...

QString	mName
	Name of the layer. More...

QgsPalLayerSettings::ObstacleType	mObstacleType
	Type of the obstacle of feature geometries. More...

QgsPalLayerSettings::Placement	mPlacement
	Placement strategy. More...

double	mPriority
	Default priority of labels. More...

QString	mProviderId
	Associated provider ID (one layer may have multiple providers, e.g. in rule-based labeling) More...

QgsPalLayerSettings::UpsideDownLabels	mUpsidedownLabels
	How to handle labels that would be upside down. More...

Additional Inherited Members
Public Types inherited from QgsAbstractLabelProvider
enum	Flag { DrawLabels = 1 << 1, DrawAllLabels = 1 << 2, MergeConnectedLines = 1 << 3, CentroidMustBeInside = 1 << 4 }

Static Public Member Functions inherited from QgsVectorLayerLabelProvider
static QgsGeometry	getPointObstacleGeometry (QgsFeature &fet, QgsRenderContext &context, const QgsSymbolList &symbols)
	Returns the geometry for a point feature which should be used as an obstacle for labels. More...

Protected Member Functions inherited from QgsVectorLayerLabelProvider
void	drawLabelPrivate (pal::LabelPosition *label, QgsRenderContext &context, QgsPalLayerSettings &tmpLyr, QgsTextRenderer::TextPart drawType, double dpiRatio=1.0) const
	Internal label drawing method. More...

void	init ()
	initialization method - called from constructors More...

Detailed Description

Implements a derived label provider for rule based labels internally used for DXF export.

Internal class, not in public API. Added in QGIS 2.15

Note: not available in Python bindings

Definition at line 72 of file qgsdxfpallabeling.h.

Constructor & Destructor Documentation

◆ QgsDxfRuleBasedLabelProvider()

QgsDxfRuleBasedLabelProvider::QgsDxfRuleBasedLabelProvider	(	const QgsRuleBasedLabeling &	rules,
		QgsVectorLayer *	layer,
		QgsDxfExport *	dxf
	)

explicit

construct the provider

Definition at line 43 of file qgsdxfpallabeling.cpp.

Member Function Documentation

◆ createProvider()

QgsVectorLayerLabelProvider * QgsDxfRuleBasedLabelProvider::createProvider	(	QgsVectorLayer *	layer,
		const QString &	providerId,
		bool	withFeatureLoop,
		const QgsPalLayerSettings *	settings
	)

overridevirtual

create QgsDxfLabelProvider

Reimplemented from QgsRuleBasedLabelProvider.

Definition at line 55 of file qgsdxfpallabeling.cpp.

◆ drawLabel()

void QgsDxfRuleBasedLabelProvider::drawLabel	(	QgsRenderContext &	context,
		pal::LabelPosition *	label
	)		const

overridevirtual

Re-implementation that writes to DXF file instead of drawing with QPainter.

Parameters

context	render context
label	label

Reimplemented from QgsVectorLayerLabelProvider.

Definition at line 62 of file qgsdxfpallabeling.cpp.

◆ registerDxfFeature()

void QgsDxfRuleBasedLabelProvider::registerDxfFeature	(	QgsFeature &	feature,
		QgsRenderContext &	context,
		const QString &	dxfLayerName
	)

Registration method that keeps track of DXF layer names of individual features.

Parameters

feature	feature
context	render context
dxfLayerName	name of dxf layer

Definition at line 69 of file qgsdxfpallabeling.cpp.

◆ reinit()

void QgsDxfRuleBasedLabelProvider::reinit ( QgsVectorLayer * layer )

Reinitialize the subproviders with QgsDxfLabelProviders.

Parameters

layer layer

Definition at line 49 of file qgsdxfpallabeling.cpp.

Member Data Documentation

◆ mDxfExport

QgsDxfExport* QgsDxfRuleBasedLabelProvider::mDxfExport = nullptr

protected

pointer to parent DXF export where this instance is used

Definition at line 104 of file qgsdxfpallabeling.h.

The documentation for this class was generated from the following files:

/build/qgis-3.10.0+15buster/src/core/dxf/qgsdxfpallabeling.h
/build/qgis-3.10.0+15buster/src/core/dxf/qgsdxfpallabeling.cpp

Public Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ QgsDxfRuleBasedLabelProvider()

Member Function Documentation

◆ createProvider()

◆ drawLabel()

◆ registerDxfFeature()

◆ reinit()

Member Data Documentation

◆ mDxfExport