Stores global configuration for labeling engine. More...

#include <qgslabelingenginesettings.h>

Public Types
enum	Flag { UseAllLabels = 1 << 1 , UsePartialCandidates = 1 << 2 , RenderOutlineLabels = 1 << 3 , DrawLabelRectOnly = 1 << 4 , DrawCandidates = 1 << 5 , DrawUnplacedLabels = 1 << 6 , CollectUnplacedLabels = 1 << 7 }
	Various flags that affect drawing and placement of labels. More...

enum	PlacementEngineVersion { PlacementEngineVersion1 , PlacementEngineVersion2 }
	Placement engine version. More...

enum	Search { Chain , Popmusic_Tabu , Popmusic_Chain , Popmusic_Tabu_Chain , Falp }
	Search methods in the PAL library to remove colliding labels (methods have different processing speed and number of labels placed) More...

Public Member Functions
	QgsLabelingEngineSettings ()

void	clear ()
	Returns the configuration to the defaults. More...

Qgis::TextRenderFormat	defaultTextRenderFormat () const
	Returns the default text rendering format for the labels. More...

Flags	flags () const
	Gets flags of the labeling engine. More...

double	maximumLineCandidatesPerCm () const
	Returns the maximum number of line label candidate positions per centimeter. More...

double	maximumPolygonCandidatesPerCmSquared () const
	Returns the maximum number of polygon label candidate positions per centimeter squared. More...

Q_DECL_DEPRECATED void	numCandidatePositions (int &candPoint, int &candLine, int &candPolygon) const
	Gets number of candidate positions that will be generated for each label feature. More...

PlacementEngineVersion	placementVersion () const
	Returns the placement engine version, which dictates how the label placement problem is solved. More...

void	readSettingsFromProject (QgsProject *project)
	Read configuration of the labeling engine from a project. More...

Q_DECL_DEPRECATED Search	searchMethod () const
	Which search method to use for removal collisions between labels. More...

void	setDefaultTextRenderFormat (Qgis::TextRenderFormat format)
	Sets the default text rendering format for the labels. More...

void	setFlag (Flag f, bool enabled=true)
	Sets whether a particual flag is enabled. More...

void	setFlags (Flags flags)
	Sets flags of the labeling engine. More...

void	setMaximumLineCandidatesPerCm (double candidates)
	Sets the maximum number of line label candidates per centimeter. More...

void	setMaximumPolygonCandidatesPerCmSquared (double candidates)
	Sets the maximum number of polygon label candidates per centimeter squared. More...

Q_DECL_DEPRECATED void	setNumCandidatePositions (int candPoint, int candLine, int candPolygon)
	Sets the number of candidate positions that will be generated for each label feature. More...

void	setPlacementVersion (PlacementEngineVersion version)
	Sets the placement engine version, which dictates how the label placement problem is solved. More...

Q_DECL_DEPRECATED void	setSearchMethod (Search s)
	Used to set which search method to use for removal collisions between labels. More...

void	setUnplacedLabelColor (const QColor &color)
	Sets the color to use when rendering unplaced labels. More...

bool	testFlag (Flag f) const
	Test whether a particular flag is enabled. More...

QColor	unplacedLabelColor () const
	Returns the color to use when rendering unplaced labels. More...

void	writeSettingsToProject (QgsProject *project)
	Write configuration of the labeling engine to a project. More...

Detailed Description

Stores global configuration for labeling engine.

Since: QGIS 3.0

Definition at line 31 of file qgslabelingenginesettings.h.

Member Enumeration Documentation

◆ Flag

enum QgsLabelingEngineSettings::Flag

Various flags that affect drawing and placement of labels.

Enumerator
UseAllLabels	Whether to draw all labels even if there would be collisions.
UsePartialCandidates	Whether to use also label candidates that are partially outside of the map view.
RenderOutlineLabels	Whether to render labels as text or outlines. Deprecated and of QGIS 3.4.3 - use defaultTextRenderFormat() instead.
DrawLabelRectOnly	Whether to only draw the label rect and not the actual label text (used for unit tests)
DrawCandidates	Whether to draw rectangles of generated candidates (good for debugging)
DrawUnplacedLabels	Whether to render unplaced labels as an indicator/warning for users.
CollectUnplacedLabels	Whether unplaced labels should be collected in the labeling results (regardless of whether they are being rendered). Since QGIS 3.20.

Definition at line 35 of file qgslabelingenginesettings.h.

◆ PlacementEngineVersion

enum QgsLabelingEngineSettings::PlacementEngineVersion

Placement engine version.

Since: QGIS 3.10.2

Enumerator
PlacementEngineVersion1	Version 1, matches placement from QGIS <= 3.10.1.
PlacementEngineVersion2	Version 2 (default for new projects since QGIS 3.12)

Definition at line 68 of file qgslabelingenginesettings.h.

◆ Search

enum QgsLabelingEngineSettings::Search

Search methods in the PAL library to remove colliding labels (methods have different processing speed and number of labels placed)

Enumerator
Chain
Popmusic_Tabu
Popmusic_Chain
Popmusic_Tabu_Chain
Falp

Definition at line 54 of file qgslabelingenginesettings.h.

Constructor & Destructor Documentation

◆ QgsLabelingEngineSettings()

QgsLabelingEngineSettings::QgsLabelingEngineSettings ( )

Definition at line 21 of file qgslabelingenginesettings.cpp.

Member Function Documentation

◆ clear()

void QgsLabelingEngineSettings::clear ( )

Returns the configuration to the defaults.

Definition at line 26 of file qgslabelingenginesettings.cpp.

◆ defaultTextRenderFormat()

Qgis::TextRenderFormat QgsLabelingEngineSettings::defaultTextRenderFormat ( ) const

inline

Returns the default text rendering format for the labels.

See also: setDefaultTextRenderFormat()

Since: QGIS 3.4.3

Definition at line 169 of file qgslabelingenginesettings.h.

◆ flags()

Flags QgsLabelingEngineSettings::flags ( ) const

inline

Gets flags of the labeling engine.

Definition at line 82 of file qgslabelingenginesettings.h.

◆ maximumLineCandidatesPerCm()

double QgsLabelingEngineSettings::maximumLineCandidatesPerCm ( ) const

inline

Returns the maximum number of line label candidate positions per centimeter.

See also: setMaximumLineCandidatesPerCm()

Since: QGIS 3.12

Definition at line 94 of file qgslabelingenginesettings.h.

◆ maximumPolygonCandidatesPerCmSquared()

double QgsLabelingEngineSettings::maximumPolygonCandidatesPerCmSquared ( ) const

inline

Returns the maximum number of polygon label candidate positions per centimeter squared.

See also: setMaximumPolygonCandidatesPerCmSquared()

Since: QGIS 3.12

Definition at line 110 of file qgslabelingenginesettings.h.

◆ numCandidatePositions()

Q_DECL_DEPRECATED void QgsLabelingEngineSettings::numCandidatePositions	(	int &	candPoint,
		int &	candLine,
		int &	candPolygon
	)		const

inline

Gets number of candidate positions that will be generated for each label feature.

Deprecated:: since QGIS 3.12 use maximumPolygonCandidatesPerCmSquared() and maximumLineCandidatesPerCm() instead.

Definition at line 124 of file qgslabelingenginesettings.h.

◆ placementVersion()

QgsLabelingEngineSettings::PlacementEngineVersion QgsLabelingEngineSettings::placementVersion ( ) const

Returns the placement engine version, which dictates how the label placement problem is solved.

See also: setPlacementVersion()

Since: QGIS 3.10.2

Definition at line 88 of file qgslabelingenginesettings.cpp.

◆ readSettingsFromProject()

void QgsLabelingEngineSettings::readSettingsFromProject ( QgsProject * project )

Read configuration of the labeling engine from a project.

Definition at line 31 of file qgslabelingenginesettings.cpp.

◆ searchMethod()

Q_DECL_DEPRECATED Search QgsLabelingEngineSettings::searchMethod ( ) const

inline

Which search method to use for removal collisions between labels.

Deprecated:: since QGIS 3.10 - Chain is always used.

Definition at line 152 of file qgslabelingenginesettings.h.

◆ setDefaultTextRenderFormat()

void QgsLabelingEngineSettings::setDefaultTextRenderFormat ( Qgis::TextRenderFormat format )

inline

Sets the default text rendering format for the labels.

See also: defaultTextRenderFormat()

Since: QGIS 3.4.3

Definition at line 180 of file qgslabelingenginesettings.h.

◆ setFlag()

void QgsLabelingEngineSettings::setFlag	(	Flag	f,
		bool	enabled = `true`
	)

inline

Sets whether a particual flag is enabled.

Definition at line 86 of file qgslabelingenginesettings.h.

◆ setFlags()

void QgsLabelingEngineSettings::setFlags ( Flags flags )

inline

Sets flags of the labeling engine.

Definition at line 80 of file qgslabelingenginesettings.h.

◆ setMaximumLineCandidatesPerCm()

void QgsLabelingEngineSettings::setMaximumLineCandidatesPerCm ( double candidates )

inline

Sets the maximum number of line label candidates per centimeter.

See also: maximumLineCandidatesPerCm()

Since: QGIS 3.12

Definition at line 102 of file qgslabelingenginesettings.h.

◆ setMaximumPolygonCandidatesPerCmSquared()

void QgsLabelingEngineSettings::setMaximumPolygonCandidatesPerCmSquared ( double candidates )

inline

Sets the maximum number of polygon label candidates per centimeter squared.

See also: maximumPolygonCandidatesPerCmSquared()

Since: QGIS 3.12

Definition at line 118 of file qgslabelingenginesettings.h.

◆ setNumCandidatePositions()

Q_DECL_DEPRECATED void QgsLabelingEngineSettings::setNumCandidatePositions	(	int	candPoint,
		int	candLine,
		int	candPolygon
	)

inline

Sets the number of candidate positions that will be generated for each label feature.

Deprecated:: since QGIS 3.12 use setMaximumPolygonCandidatesPerCmSquared() and setMaximumLineCandidatesPerCm() instead.

Definition at line 135 of file qgslabelingenginesettings.h.

◆ setPlacementVersion()

void QgsLabelingEngineSettings::setPlacementVersion ( PlacementEngineVersion version )

Sets the placement engine version, which dictates how the label placement problem is solved.

See also: placementVersion()

Since: QGIS 3.10.2

Definition at line 93 of file qgslabelingenginesettings.cpp.

◆ setSearchMethod()

Q_DECL_DEPRECATED void QgsLabelingEngineSettings::setSearchMethod ( Search s )

inline

Used to set which search method to use for removal collisions between labels.

Deprecated:: since QGIS 3.10 - Chain is always used.

Definition at line 146 of file qgslabelingenginesettings.h.

◆ setUnplacedLabelColor()

void QgsLabelingEngineSettings::setUnplacedLabelColor ( const QColor & color )

Sets the color to use when rendering unplaced labels.

See also: unplacedLabelColor()

Since: QGIS 3.10

Definition at line 83 of file qgslabelingenginesettings.cpp.

◆ testFlag()

bool QgsLabelingEngineSettings::testFlag ( Flag f ) const

inline

Test whether a particular flag is enabled.

Definition at line 84 of file qgslabelingenginesettings.h.

◆ unplacedLabelColor()

QColor QgsLabelingEngineSettings::unplacedLabelColor ( ) const

Returns the color to use when rendering unplaced labels.

See also: setUnplacedLabelColor()

Since: QGIS 3.10

Definition at line 78 of file qgslabelingenginesettings.cpp.

◆ writeSettingsToProject()

void QgsLabelingEngineSettings::writeSettingsToProject ( QgsProject * project )

Write configuration of the labeling engine to a project.

Definition at line 59 of file qgslabelingenginesettings.cpp.

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

/build/qgis-3.28.0+99sid/src/core/labeling/qgslabelingenginesettings.h
/build/qgis-3.28.0+99sid/src/core/labeling/qgslabelingenginesettings.cpp

Public Types

Public Member Functions

Detailed Description

Member Enumeration Documentation

◆ Flag

◆ PlacementEngineVersion

◆ Search

Constructor & Destructor Documentation

◆ QgsLabelingEngineSettings()

Member Function Documentation

◆ clear()

◆ defaultTextRenderFormat()

◆ flags()

◆ maximumLineCandidatesPerCm()

◆ maximumPolygonCandidatesPerCmSquared()

◆ numCandidatePositions()

◆ placementVersion()

◆ readSettingsFromProject()

◆ searchMethod()

◆ setDefaultTextRenderFormat()

◆ setFlag()

◆ setFlags()

◆ setMaximumLineCandidatesPerCm()

◆ setMaximumPolygonCandidatesPerCmSquared()

◆ setNumCandidatePositions()

◆ setPlacementVersion()

◆ setSearchMethod()

◆ setUnplacedLabelColor()

◆ testFlag()

◆ unplacedLabelColor()

◆ writeSettingsToProject()