#include <qgspallabeling.h>

Public Types
enum	DirectionSymbols { SymbolLeftRight, SymbolAbove, SymbolBelow }

enum	LinePlacementFlags { OnLine = 1, AboveLine = 2, BelowLine = 4, MapOrientation = 8 }
	Line placement flags, which control how candidates are generated for a linear feature. More...

enum	MultiLineAlign { MultiLeft = 0, MultiCenter, MultiRight, MultiFollowPlacement }

enum	ObstacleType { PolygonInterior, PolygonBoundary, PolygonWhole }
	Valid obstacle types, which affect how features within the layer will act as obstacles for labels. More...

enum	OffsetType { FromPoint, FromSymbolBounds }
	Behavior modifier for label offset and distance, only applies in some label placement modes. More...

enum	Placement { AroundPoint, OverPoint, Line, Curved, Horizontal, Free, OrderedPositionsAroundPoint, PerimeterCurved }
	Placement modes which determine how label candidates are generated for a feature. More...

enum	PredefinedPointPosition { TopLeft, TopSlightlyLeft, TopMiddle, TopSlightlyRight, TopRight, MiddleLeft, MiddleRight, BottomLeft, BottomSlightlyLeft, BottomMiddle, BottomSlightlyRight, BottomRight }
	Positions for labels when using the QgsPalLabeling::OrderedPositionsAroundPoint placement mode. More...

enum	Property { Size = 0, Bold = 1, Italic = 2, Underline = 3, Color = 4, Strikeout = 5, Family = 6, FontStyle = 21, FontSizeUnit = 22, FontTransp = 18, FontOpacity = 92, FontCase = 27, FontLetterSpacing = 28, FontWordSpacing = 29, FontBlendMode = 30, MultiLineWrapChar = 31, AutoWrapLength = 101, MultiLineHeight = 32, MultiLineAlignment = 33, TextOrientation = 104, DirSymbDraw = 34, DirSymbLeft = 35, DirSymbRight = 36, DirSymbPlacement = 37, DirSymbReverse = 38, NumFormat = 39, NumDecimals = 40, NumPlusSign = 41, BufferDraw = 42, BufferSize = 7, BufferUnit = 43, BufferColor = 8, BufferTransp = 19, BufferOpacity = 94, BufferJoinStyle = 44, BufferBlendMode = 45, ShapeDraw = 46, ShapeKind = 47, ShapeSVGFile = 48, ShapeSizeType = 49, ShapeSizeX = 50, ShapeSizeY = 85, ShapeSizeUnits = 51, ShapeRotationType = 52, ShapeRotation = 53, ShapeOffset = 54, ShapeOffsetUnits = 55, ShapeRadii = 56, ShapeRadiiUnits = 57, ShapeTransparency = 63, ShapeOpacity = 93, ShapeBlendMode = 64, ShapeFillColor = 58, ShapeStrokeColor = 59, ShapeStrokeWidth = 60, ShapeStrokeWidthUnits = 61, ShapeJoinStyle = 62, ShadowDraw = 65, ShadowUnder = 66, ShadowOffsetAngle = 67, ShadowOffsetDist = 68, ShadowOffsetUnits = 69, ShadowRadius = 70, ShadowRadiusUnits = 71, ShadowTransparency = 72, ShadowOpacity = 95, ShadowScale = 73, ShadowColor = 74, ShadowBlendMode = 75, CentroidWhole = 76, OffsetQuad = 77, OffsetXY = 78, OffsetUnits = 80, LabelDistance = 13, DistanceUnits = 81, OffsetRotation = 82, CurvedCharAngleInOut = 83, PositionX = 9, PositionY = 10, Hali = 11, Vali = 12, Rotation = 14, LabelRotation = 96, RepeatDistance = 84, RepeatDistanceUnit = 86, Priority = 87, PredefinedPositionOrder = 91, LinePlacementOptions = 99, OverrunDistance = 102, LabelAllParts = 103, ScaleVisibility = 23, MinScale = 16, MinimumScale = 97, MaxScale = 17, MaximumScale = 98, FontLimitPixel = 24, FontMinPixel = 25, FontMaxPixel = 26, IsObstacle = 88, ObstacleFactor = 89, ZIndex = 90, CalloutDraw = 100, Show = 15, AlwaysShow = 20 }
	Data definable properties. More...

enum	QuadrantPosition { QuadrantAboveLeft, QuadrantAbove, QuadrantAboveRight, QuadrantLeft, QuadrantOver, QuadrantRight, QuadrantBelowLeft, QuadrantBelow, QuadrantBelowRight }

enum	UpsideDownLabels { Upright, ShowDefined, ShowAll }

Public Member Functions
	QgsPalLayerSettings ()

	QgsPalLayerSettings (const QgsPalLayerSettings &s)

	~QgsPalLayerSettings ()

void	calculateLabelSize (const QFontMetricsF fm, const QString &text, double &labelX, double &labelY, const QgsFeature f=nullptr, QgsRenderContext context=nullptr, double rotatedLabelX=nullptr, double *rotatedLabelY=nullptr)
	Calculates the space required to render the provided text in map units. More...

QgsCallout *	callout () const
	Returns the label callout renderer, responsible for drawing label callouts. More...

QgsPropertyCollection &	dataDefinedProperties ()
	Returns a reference to the label's property collection, used for data defined overrides. More...

const QgsPropertyCollection &	dataDefinedProperties () const
	Returns a reference to the label's property collection, used for data defined overrides. More...

const QgsTextFormat &	format () const
	Returns the label text formatting settings, e.g., font settings, buffer settings, etc. More...

QgsExpression *	getLabelExpression ()
	Returns the QgsExpression for this label settings. More...

QgsPalLayerSettings &	operator= (const QgsPalLayerSettings &s)
	copy operator - only copies the permanent members More...

bool	prepare (QgsRenderContext &context, QSet< QString > &attributeNames, const QgsFields &fields, const QgsMapSettings &mapSettings, const QgsCoordinateReferenceSystem &crs)
	Prepare for registration of features. More...

void	readXml (const QDomElement &elem, const QgsReadWriteContext &context)
	Read settings from a DOM element. More...

void	registerFeature (const QgsFeature &f, QgsRenderContext &context, QgsLabelFeature *labelFeature=nullptr, QgsGeometry obstacleGeometry=QgsGeometry(), const QgsSymbol symbol=nullptr)
	Register a feature for labeling. More...

void	setCallout (QgsCallout *callout)
	Sets the label callout renderer, responsible for drawing label callouts. More...

void	setDataDefinedProperties (const QgsPropertyCollection &collection)
	Sets the label's property collection, used for data defined overrides. More...

void	setFormat (const QgsTextFormat &format)
	Sets the label text formatting settings, e.g., font settings, buffer settings, etc. More...

void	startRender (QgsRenderContext &context)
	Prepares the label settings for rendering. More...

void	stopRender (QgsRenderContext &context)
	Finalises the label settings after use. More...

QDomElement	writeXml (QDomDocument &doc, const QgsReadWriteContext &context) const
	Write settings into a DOM element. More...

Static Public Member Functions
static QPixmap	labelSettingsPreviewPixmap (const QgsPalLayerSettings &settings, QSize size, const QString &previewText=QString(), int padding=0)
	Returns a pixmap preview for label settings. More...

static const QgsPropertiesDefinition &	propertyDefinitions ()
	Returns the labeling property definitions. More...

Public Attributes
bool	addDirectionSymbol
	If `true`, '<' or '>' (or custom strings set via leftDirectionSymbol and rightDirectionSymbol) will be automatically added to the label text, pointing in the direction of the line or polygon ring. More...

double	angleOffset
	Label rotation, in degrees clockwise. More...

int	autoWrapLength = 0
	If non-zero, indicates that label text should be automatically wrapped to (ideally) the specified number of characters. More...

bool	centroidInside
	`true` if centroid positioned labels must be placed inside their corresponding feature polygon, or `false` if centroids which fall outside the polygon are permitted. More...

bool	centroidWhole
	`true` if feature centroid should be calculated from the whole feature, or `false` if only the visible part of the feature should be considered. More...

QgsCoordinateTransform	ct

int	decimals
	Number of decimal places to show for numeric labels. More...

bool	displayAll
	If `true`, all features will be labelled even when overlaps occur. More...

double	dist
	Distance from feature to the label. More...

QgsMapUnitScale	distMapUnitScale
	Map unit scale for label feature distance. More...

QgsUnitTypes::RenderUnit	distUnits
	Units the distance from feature to the label. More...

bool	drawLabels
	Whether to draw labels for this layer. More...

QgsGeometry	extentGeom

int	fieldIndex

QString	fieldName
	Name of field (or an expression) to use for label text. More...

bool	fitInPolygonOnly
	`true` if only labels which completely fit within a polygon are allowed. More...

bool	fontLimitPixelSize
	`true` if label sizes should be limited by pixel size. More...

int	fontMaxPixelSize
	Maximum pixel size for showing rendered map unit labels (1 - 10000). More...

int	fontMinPixelSize
	Minimum pixel size for showing rendered map unit labels (1 - 1000). More...

bool	formatNumbers
	Set to `true` to format numeric label text as numbers (e.g. More...

QString	geometryGenerator
	The geometry generator expression. Null if disabled. More...

bool	geometryGeneratorEnabled = false
	Defines if the geometry generator is enabled or not. If disabled, the standard geometry will be taken. More...

QgsWkbTypes::GeometryType	geometryGeneratorType = QgsWkbTypes::GeometryType::PointGeometry
	The type of the result geometry of the geometry generator. More...

bool	isExpression
	`true` if this label is made from a expression string, e.g., FieldName \|\| 'mm' More...

QgsMapUnitScale	labelOffsetMapUnitScale
	Map unit scale for label offset. More...

bool	labelPerPart
	`true` if every part of a multi-part feature should be labeled. More...

QgsWkbTypes::GeometryType	layerType = QgsWkbTypes::UnknownGeometry
	Geometry type of layers associated with these settings. More...

QString	leftDirectionSymbol
	String to use for left direction arrows. More...

bool	limitNumLabels
	`true` if the number of labels drawn should be limited. More...

double	maxCurvedCharAngleIn
	Maximum angle between inside curved label characters (valid range 20.0 to 60.0). More...

double	maxCurvedCharAngleOut
	Maximum angle between outside curved label characters (valid range -20.0 to -95.0) More...

double	maximumScale
	The maximum map scale (i.e. More...

int	maxNumLabels
	The maximum number of labels which should be drawn for this layer. More...

const QgsFeature *	mCurFeat = nullptr

QgsFields	mCurFields

bool	mergeLines
	`true` if connected line features with identical label text should be merged prior to generating label positions. More...

int	mFeatsRegPal = 0

int	mFeatsSendingToPal = 0

int	mFeaturesToLabel = 0

double	minFeatureSize
	Minimum feature size (in millimeters) for a feature to be labelled. More...

double	minimumScale
	The minimum map scale (i.e. More...

MultiLineAlign	multilineAlign
	Horizontal alignment of multi-line labels. More...

bool	obstacle
	`true` if features for layer are obstacles to labels of other layers. More...

double	obstacleFactor
	Obstacle factor, where 1.0 = default, < 1.0 more likely to be covered by labels, 1.0 less likely to be covered More...

ObstacleType	obstacleType
	Controls how features act as obstacles for labels. More...

OffsetType	offsetType
	Offset type for layer (only applies in certain placement modes) More...

QgsUnitTypes::RenderUnit	offsetUnits
	Units for offsets of label. More...

double	overrunDistance = 0
	Distance which labels are allowed to overrun past the start or end of line features. More...

QgsMapUnitScale	overrunDistanceMapUnitScale
	Map unit scale for label overrun distance. More...

QgsUnitTypes::RenderUnit	overrunDistanceUnit = QgsUnitTypes::RenderMillimeters
	Units for label overrun distance. More...

DirectionSymbols	placeDirectionSymbol
	Placement option for direction symbols. More...

Placement	placement

unsigned int	placementFlags

bool	plusSign
	Whether '+' signs should be prepended to positive numeric labels. More...

QVector< PredefinedPointPosition >	predefinedPositionOrder
	Ordered list of predefined label positions for points. More...

bool	preserveRotation
	True if label rotation should be preserved during label pin/unpin operations. More...

Q_DECL_DEPRECATED QColor	previewBkgrdColor = Qt::white

int	priority
	Label priority. More...

QgsPointXY	ptOne

QgsPointXY	ptZero

QuadrantPosition	quadOffset
	Sets the quadrant in which to offset labels from feature. More...

double	repeatDistance
	Distance for repeating labels for a single feature. More...

QgsMapUnitScale	repeatDistanceMapUnitScale
	Map unit scale for repeating labels for a single feature. More...

QgsUnitTypes::RenderUnit	repeatDistanceUnit
	Units for repeating labels for a single feature. More...

bool	reverseDirectionSymbol
	True if direction symbols should be reversed. More...

QString	rightDirectionSymbol
	String to use for right direction arrows. More...

bool	scaleVisibility
	Set to `true` to limit label visibility to a range of scales. More...

QgsStringReplacementCollection	substitutions
	Substitution collection for automatic text substitution with labels. More...

UpsideDownLabels	upsidedownLabels = Upright
	Controls whether upside down labels are displayed and how they are handled. More...

bool	useMaxLineLengthForAutoWrap = true
	If `true`, indicates that when auto wrapping label text the autoWrapLength length indicates the maximum ideal length of text lines. More...

bool	useSubstitutions
	True if substitutions should be applied. More...

QString	wrapChar
	Wrapping character string. More...

const QgsMapToPixel *	xform = nullptr

double	xOffset
	Horizontal offset of label. More...

double	yOffset
	Vertical offset of label. More...

double	zIndex
	Z-Index of label, where labels with a higher z-index are rendered on top of labels with a lower z-index. More...

Friends
class	QgsVectorLayer

Detailed Description

Definition at line 201 of file qgspallabeling.h.

Member Enumeration Documentation

◆ DirectionSymbols

enum QgsPalLayerSettings::DirectionSymbols

Enumerator
SymbolLeftRight	Place direction symbols on left/right of label.
SymbolAbove	Place direction symbols on above label.
SymbolBelow	Place direction symbols on below label.

Definition at line 298 of file qgspallabeling.h.

◆ LinePlacementFlags

enum QgsPalLayerSettings::LinePlacementFlags

Line placement flags, which control how candidates are generated for a linear feature.

Enumerator
OnLine	Labels can be placed directly over a line feature.
AboveLine	Labels can be placed above a line feature. Unless MapOrientation is also specified this mode respects the direction of the line feature, so a line from right to left labels will have labels placed placed below the line feature.
BelowLine	Labels can be placed below a line feature. Unless MapOrientation is also specified this mode respects the direction of the line feature, so a line from right to left labels will have labels placed placed above the line feature.
MapOrientation	Signifies that the AboveLine and BelowLine flags should respect the map's orientation rather than the feature's orientation. For example, AboveLine will always result in label's being placed above a line, regardless of the line's direction.

Definition at line 264 of file qgspallabeling.h.

◆ MultiLineAlign

enum QgsPalLayerSettings::MultiLineAlign

Enumerator
MultiLeft
MultiCenter
MultiRight
MultiFollowPlacement	Alignment follows placement of label, e.g., labels to the left of a feature will be drawn with right alignment

Definition at line 305 of file qgspallabeling.h.

◆ ObstacleType

enum QgsPalLayerSettings::ObstacleType

Valid obstacle types, which affect how features within the layer will act as obstacles for labels.

Enumerator
PolygonInterior	avoid placing labels over interior of polygon (prefer placing labels totally outside or just slightly inside polygon)
PolygonBoundary	avoid placing labels over boundary of polygon (prefer placing outside or completely inside polygon)
PolygonWhole	avoid placing labels over ANY part of polygon. Where PolygonInterior will prefer to place labels with the smallest area of intersection between the label and the polygon, PolygonWhole will penalise any label which intersects with the polygon by an equal amount, so that placing labels over any part of the polygon is avoided.

Definition at line 320 of file qgspallabeling.h.

◆ OffsetType

enum QgsPalLayerSettings::OffsetType

Behavior modifier for label offset and distance, only applies in some label placement modes.

Enumerator
FromPoint	Offset distance applies from point geometry.
FromSymbolBounds	Offset distance applies from rendered symbol bounds.

Definition at line 252 of file qgspallabeling.h.

◆ Placement

enum QgsPalLayerSettings::Placement

Placement modes which determine how label candidates are generated for a feature.

Enumerator
AroundPoint	Arranges candidates in a circle around a point (or centroid of a polygon). Applies to point or polygon layers only.
OverPoint	Arranges candidates over a point (or centroid of a polygon), or at a preset offset from the point. Applies to point or polygon layers only.
Line	Arranges candidates parallel to a generalised line representing the feature or parallel to a polygon's perimeter. Applies to line or polygon layers only.
Curved	Arranges candidates following the curvature of a line feature. Applies to line layers only.
Horizontal	Arranges horizontal candidates scattered throughout a polygon feature. Applies to polygon layers only.
Free	Arranges candidates scattered throughout a polygon feature. Candidates are rotated to respect the polygon's orientation. Applies to polygon layers only.
OrderedPositionsAroundPoint	Candidates are placed in predefined positions around a point. Preference is given to positions with greatest cartographic appeal, e.g., top right, bottom right, etc. Applies to point layers only.
PerimeterCurved	Arranges candidates following the curvature of a polygon's boundary. Applies to polygon layers only.

Definition at line 216 of file qgspallabeling.h.

◆ PredefinedPointPosition

enum QgsPalLayerSettings::PredefinedPointPosition

Positions for labels when using the QgsPalLabeling::OrderedPositionsAroundPoint placement mode.

Enumerator
TopLeft	Label on top-left of point.
TopSlightlyLeft	Label on top of point, slightly left of center.
TopMiddle	Label directly above point.
TopSlightlyRight	Label on top of point, slightly right of center.
TopRight	Label on top-right of point.
MiddleLeft	Label on left of point.
MiddleRight	Label on right of point.
BottomLeft	Label on bottom-left of point.
BottomSlightlyLeft	Label below point, slightly left of center.
BottomMiddle	Label directly below point.
BottomSlightlyRight	Label below point, slightly right of center.
BottomRight	Label on bottom right of point.

Definition at line 230 of file qgspallabeling.h.

◆ Property

enum QgsPalLayerSettings::Property

Data definable properties.

Enumerator
Size	Label size.
Bold	Use bold style.
Italic	Use italic style.
Underline	Use underline.
Color	Text color.
Strikeout	Use strikeout.
Family	Font family.
FontStyle	Font style name.
FontSizeUnit	Font size units.
FontTransp	Text transparency (deprecated)
FontOpacity	Text opacity.
FontCase	Label text case.
FontLetterSpacing	Letter spacing.
FontWordSpacing	Word spacing.
FontBlendMode	Text blend mode.
MultiLineWrapChar
AutoWrapLength
MultiLineHeight
MultiLineAlignment
TextOrientation
DirSymbDraw
DirSymbLeft
DirSymbRight
DirSymbPlacement
DirSymbReverse
NumFormat
NumDecimals
NumPlusSign
BufferDraw
BufferSize
BufferUnit
BufferColor
BufferTransp	Buffer transparency (deprecated)
BufferOpacity	Buffer opacity.
BufferJoinStyle
BufferBlendMode
ShapeDraw
ShapeKind
ShapeSVGFile
ShapeSizeType
ShapeSizeX
ShapeSizeY
ShapeSizeUnits
ShapeRotationType
ShapeRotation
ShapeOffset
ShapeOffsetUnits
ShapeRadii
ShapeRadiiUnits
ShapeTransparency	Shape transparency (deprecated)
ShapeOpacity	Shape opacity.
ShapeBlendMode
ShapeFillColor
ShapeStrokeColor
ShapeStrokeWidth
ShapeStrokeWidthUnits
ShapeJoinStyle
ShadowDraw
ShadowUnder
ShadowOffsetAngle
ShadowOffsetDist
ShadowOffsetUnits
ShadowRadius
ShadowRadiusUnits
ShadowTransparency	Shadow transparency (deprecated)
ShadowOpacity	Shadow opacity.
ShadowScale
ShadowColor
ShadowBlendMode
CentroidWhole
OffsetQuad
OffsetXY
OffsetUnits
LabelDistance
DistanceUnits
OffsetRotation
CurvedCharAngleInOut
PositionX	X-coordinate data defined label position.
PositionY	Y-coordinate data defined label position.
Hali	Horizontal alignment for data defined label position (Left, Center, Right)
Vali	Vertical alignment for data defined label position (Bottom, Base, Half, Cap, Top)
Rotation	Label rotation (deprecated, for old project compatibility only)
LabelRotation	Label rotation.
RepeatDistance
RepeatDistanceUnit
Priority
PredefinedPositionOrder
LinePlacementOptions	Line placement flags.
OverrunDistance	Distance which labels can extend past either end of linear features.
LabelAllParts	Whether all parts of multi-part features should be labeled.
ScaleVisibility
MinScale	Min scale (deprecated, for old project compatibility only)
MinimumScale	Minimum map scale (ie most "zoomed out")
MaxScale	Max scale (deprecated, for old project compatibility only)
MaximumScale	Maximum map scale (ie most "zoomed in")
FontLimitPixel
FontMinPixel
FontMaxPixel
IsObstacle
ObstacleFactor
ZIndex
CalloutDraw	Show callout.
Show
AlwaysShow

Definition at line 333 of file qgspallabeling.h.

◆ QuadrantPosition

enum QgsPalLayerSettings::QuadrantPosition

Enumerator
QuadrantAboveLeft
QuadrantAbove
QuadrantAboveRight
QuadrantLeft
QuadrantOver
QuadrantRight
QuadrantBelowLeft
QuadrantBelow
QuadrantBelowRight

Definition at line 278 of file qgspallabeling.h.

◆ UpsideDownLabels

enum QgsPalLayerSettings::UpsideDownLabels

Enumerator
Upright	Upside-down labels (90 <= angle < 270) are shown upright.
ShowDefined	Show upside down when rotation is layer- or data-defined.
ShowAll	Show upside down for all labels, including dynamic ones.

Definition at line 291 of file qgspallabeling.h.

Constructor & Destructor Documentation

◆ QgsPalLayerSettings() [1/2]

Q_NOWARN_DEPRECATED_PUSH QgsPalLayerSettings::QgsPalLayerSettings ( )

Definition at line 250 of file qgspallabeling.cpp.

◆ QgsPalLayerSettings() [2/2]

Q_NOWARN_DEPRECATED_POP Q_NOWARN_DEPRECATED_PUSH QgsPalLayerSettings::QgsPalLayerSettings ( const QgsPalLayerSettings & s )

Definition at line 318 of file qgspallabeling.cpp.

◆ ~QgsPalLayerSettings()

QgsPalLayerSettings::~QgsPalLayerSettings ( )

Definition at line 579 of file qgspallabeling.cpp.

Member Function Documentation

◆ calculateLabelSize()

void QgsPalLayerSettings::calculateLabelSize	(	const QFontMetricsF *	fm,
		const QString &	text,
		double &	labelX,
		double &	labelY,
		const QgsFeature *	f = `nullptr`,
		QgsRenderContext *	context = `nullptr`,
		double *	rotatedLabelX = `nullptr`,
		double *	rotatedLabelY = `nullptr`
	)

Calculates the space required to render the provided text in map units.

Results will be written to labelX and labelY. If the text orientation is set to rotation-based, the spaced taken to render vertically oriented text will be written to rotatedLabelX and rotatedLabelY .

Definition at line 1392 of file qgspallabeling.cpp.

◆ callout()

QgsCallout* QgsPalLayerSettings::callout ( ) const

inline

Returns the label callout renderer, responsible for drawing label callouts.

Ownership is not transferred.

See also: setCallout()

Since: QGIS 3.10

Definition at line 1002 of file qgspallabeling.h.

◆ dataDefinedProperties() [1/2]

QgsPropertyCollection& QgsPalLayerSettings::dataDefinedProperties ( )

inline

Returns a reference to the label's property collection, used for data defined overrides.

See also: setDataDefinedProperties()

Since: QGIS 3.0

Definition at line 959 of file qgspallabeling.h.

◆ dataDefinedProperties() [2/2]

const QgsPropertyCollection& QgsPalLayerSettings::dataDefinedProperties ( ) const

inline

Returns a reference to the label's property collection, used for data defined overrides.

See also: setDataDefinedProperties(); Property

Note: not available in Python bindings

Since: QGIS 3.0

Definition at line 968 of file qgspallabeling.h.

◆ format()

const QgsTextFormat& QgsPalLayerSettings::format ( ) const

inline

Returns the label text formatting settings, e.g., font settings, buffer settings, etc.

See also: setFormat()

Since: QGIS 3.0

Definition at line 984 of file qgspallabeling.h.

◆ getLabelExpression()

QgsExpression * QgsPalLayerSettings::getLabelExpression ( )

Returns the QgsExpression for this label settings.

May be nullptr if isExpression is false.

Definition at line 598 of file qgspallabeling.cpp.

◆ labelSettingsPreviewPixmap()

QPixmap QgsPalLayerSettings::labelSettingsPreviewPixmap	(	const QgsPalLayerSettings &	settings,
		QSize	size,
		const QString &	previewText = `QString()`,
		int	padding = `0`
	)

static

Returns a pixmap preview for label settings.

Parameters

settings	label settings
size	target pixmap size
previewText	text to render in preview, or empty for default text
padding	space between icon edge and color ramp

Since: QGIS 3.10

Definition at line 1268 of file qgspallabeling.cpp.

◆ operator=()

Q_NOWARN_DEPRECATED_POP QgsPalLayerSettings & QgsPalLayerSettings::operator= ( const QgsPalLayerSettings & s )

copy operator - only copies the permanent members

Definition at line 326 of file qgspallabeling.cpp.

◆ prepare()

bool QgsPalLayerSettings::prepare	(	QgsRenderContext &	context,
		QSet< QString > &	attributeNames,
		const QgsFields &	fields,
		const QgsMapSettings &	mapSettings,
		const QgsCoordinateReferenceSystem &	crs
	)

Prepare for registration of features.

The context, mapSettings and fields parameters give more information about the rendering environment. If target crs is not specified, the targetCrs from mapSettings will be taken. The parameter attributeNames should be updated to contain all the field names which the labeling requires for the rendering.

Since: QGIS 3.8

Definition at line 419 of file qgspallabeling.cpp.

◆ propertyDefinitions()

const QgsPropertiesDefinition & QgsPalLayerSettings::propertyDefinitions ( )

static

Returns the labeling property definitions.

Since: QGIS 3.0

Definition at line 592 of file qgspallabeling.cpp.

◆ readXml()

void QgsPalLayerSettings::readXml	(	const QDomElement &	elem,
		const QgsReadWriteContext &	context
	)

Read settings from a DOM element.

Since: QGIS 2.12

Definition at line 923 of file qgspallabeling.cpp.

◆ registerFeature()

void QgsPalLayerSettings::registerFeature	(	const QgsFeature &	f,
		QgsRenderContext &	context,
		QgsLabelFeature **	labelFeature = `nullptr`,
		QgsGeometry	obstacleGeometry = `QgsGeometry()`,
		const QgsSymbol *	symbol = `nullptr`
	)

Register a feature for labeling.

Parameters

f	feature to label
context	render context. The QgsExpressionContext contained within the render context must have already had the feature and fields sets prior to calling this method.
labelFeature	if using QgsLabelingEngine, this will receive the label feature. Not available in Python bindings.
obstacleGeometry	optional obstacle geometry, if a different geometry to the feature's geometry should be used as an obstacle for labels (e.g., if the feature has been rendered with an offset point symbol, the obstacle geometry should represent the bounds of the offset symbol). If not set, the feature's original geometry will be used as an obstacle for labels. Not available in Python bindings.
symbol	feature symbol to label (ownership is not transferred, and symbol must exist until the labeling is complete)

Definition at line 1628 of file qgspallabeling.cpp.

◆ setCallout()

void QgsPalLayerSettings::setCallout ( QgsCallout * callout )

Sets the label callout renderer, responsible for drawing label callouts.

Ownership of callout is transferred to the settings.

See also: callout()

Since: QGIS 3.10

Definition at line 1263 of file qgspallabeling.cpp.

◆ setDataDefinedProperties()

void QgsPalLayerSettings::setDataDefinedProperties ( const QgsPropertyCollection & collection )

inline

Sets the label's property collection, used for data defined overrides.

Parameters

collection property collection. Existing properties will be replaced.

See also: dataDefinedProperties(); Property

Since: QGIS 3.0

Definition at line 977 of file qgspallabeling.h.

◆ setFormat()

void QgsPalLayerSettings::setFormat ( const QgsTextFormat & format )

inline

Sets the label text formatting settings, e.g., font settings, buffer settings, etc.

Parameters

format label text format

See also: format()

Since: QGIS 3.0

Definition at line 992 of file qgspallabeling.h.

◆ startRender()

void QgsPalLayerSettings::startRender ( QgsRenderContext & context )

Prepares the label settings for rendering.

This should be called before rendering any labels, and must be followed by a call to stopRender() in order to gracefully clean up symbols.

Since: QGIS 3.10

Definition at line 540 of file qgspallabeling.cpp.

◆ stopRender()

void QgsPalLayerSettings::stopRender ( QgsRenderContext & context )

Finalises the label settings after use.

This must be called after a call to startRender(), in order to gracefully clean up symbols.

Since: QGIS 3.10

Definition at line 563 of file qgspallabeling.cpp.

◆ writeXml()

QDomElement QgsPalLayerSettings::writeXml	(	QDomDocument &	doc,
		const QgsReadWriteContext &	context
	)		const

Write settings into a DOM element.

Since: QGIS 2.12

Definition at line 1159 of file qgspallabeling.cpp.

Friends And Related Function Documentation

◆ QgsVectorLayer

friend class QgsVectorLayer

friend

Definition at line 1039 of file qgspallabeling.h.

Member Data Documentation

◆ addDirectionSymbol

bool QgsPalLayerSettings::addDirectionSymbol

If true, '<' or '>' (or custom strings set via leftDirectionSymbol and rightDirectionSymbol) will be automatically added to the label text, pointing in the direction of the line or polygon ring.

This setting only affects line or perimeter based labels.

See also: leftDirectionSymbol; rightDirectionSymbol; placeDirectionSymbol; reverseDirectionSymbol

Definition at line 578 of file qgspallabeling.h.

◆ angleOffset

double QgsPalLayerSettings::angleOffset

Label rotation, in degrees clockwise.

Definition at line 763 of file qgspallabeling.h.

◆ autoWrapLength

int QgsPalLayerSettings::autoWrapLength = 0

If non-zero, indicates that label text should be automatically wrapped to (ideally) the specified number of characters.

If zero, auto wrapping is disabled.

See also: useMaxLineLengthForAutoWrap

Since: QGIS 3.4

Definition at line 551 of file qgspallabeling.h.

◆ centroidInside

bool QgsPalLayerSettings::centroidInside

true if centroid positioned labels must be placed inside their corresponding feature polygon, or false if centroids which fall outside the polygon are permitted.

Definition at line 641 of file qgspallabeling.h.

◆ centroidWhole

bool QgsPalLayerSettings::centroidWhole

true if feature centroid should be calculated from the whole feature, or false if only the visible part of the feature should be considered.

Definition at line 634 of file qgspallabeling.h.

◆ ct

QgsCoordinateTransform QgsPalLayerSettings::ct

Definition at line 1029 of file qgspallabeling.h.

◆ decimals

int QgsPalLayerSettings::decimals

Number of decimal places to show for numeric labels.

formatNumbers must be true for this setting to have an effect.

See also: formatNumbers

Definition at line 616 of file qgspallabeling.h.

◆ displayAll

bool QgsPalLayerSettings::displayAll

If true, all features will be labelled even when overlaps occur.

Definition at line 841 of file qgspallabeling.h.

◆ dist

double QgsPalLayerSettings::dist

Distance from feature to the label.

Units are specified via distUnits.

See also: distUnits; distMapUnitScale

Definition at line 661 of file qgspallabeling.h.

◆ distMapUnitScale

QgsMapUnitScale QgsPalLayerSettings::distMapUnitScale

Map unit scale for label feature distance.

See also: dist; distUnits

Definition at line 675 of file qgspallabeling.h.

◆ distUnits

QgsUnitTypes::RenderUnit QgsPalLayerSettings::distUnits

Units the distance from feature to the label.

See also: dist; distMapUnitScale

Definition at line 668 of file qgspallabeling.h.

◆ drawLabels

bool QgsPalLayerSettings::drawLabels

Whether to draw labels for this layer.

For some layers it may be desirable to register their features as obstacles for other labels without requiring labels to be drawn for the layer itself. In this case drawLabels can be set to false and obstacle set to true, which will result in the layer acting as an obstacle but having no labels of its own.

Since: QGIS 2.12

Definition at line 504 of file qgspallabeling.h.

◆ extentGeom

QgsGeometry QgsPalLayerSettings::extentGeom

Definition at line 1033 of file qgspallabeling.h.

◆ fieldIndex

int QgsPalLayerSettings::fieldIndex

Definition at line 1027 of file qgspallabeling.h.

◆ fieldName

QString QgsPalLayerSettings::fieldName

Name of field (or an expression) to use for label text.

If fieldName is an expression, then isExpression should be set to true.

See also: isExpression

Definition at line 513 of file qgspallabeling.h.

◆ fitInPolygonOnly

bool QgsPalLayerSettings::fitInPolygonOnly

true if only labels which completely fit within a polygon are allowed.

Definition at line 654 of file qgspallabeling.h.

◆ fontLimitPixelSize

bool QgsPalLayerSettings::fontLimitPixelSize

true if label sizes should be limited by pixel size.

See also: fontMinPixelSize; fontMaxPixelSize

Definition at line 824 of file qgspallabeling.h.

◆ fontMaxPixelSize

int QgsPalLayerSettings::fontMaxPixelSize

Maximum pixel size for showing rendered map unit labels (1 - 10000).

See also: fontLimitPixelSize; fontMinPixelSize

Definition at line 838 of file qgspallabeling.h.

◆ fontMinPixelSize

int QgsPalLayerSettings::fontMinPixelSize

Minimum pixel size for showing rendered map unit labels (1 - 1000).

See also: fontLimitPixelSize; fontMaxPixelSize

Definition at line 831 of file qgspallabeling.h.

◆ formatNumbers

bool QgsPalLayerSettings::formatNumbers

Set to true to format numeric label text as numbers (e.g.

inserting thousand separators and fixed number of decimal places).

See also: decimals; plusSign

Definition at line 609 of file qgspallabeling.h.

◆ geometryGenerator

QString QgsPalLayerSettings::geometryGenerator

The geometry generator expression. Null if disabled.

Definition at line 902 of file qgspallabeling.h.

◆ geometryGeneratorEnabled

bool QgsPalLayerSettings::geometryGeneratorEnabled = false

Defines if the geometry generator is enabled or not. If disabled, the standard geometry will be taken.

Definition at line 908 of file qgspallabeling.h.

◆ geometryGeneratorType

QgsWkbTypes::GeometryType QgsPalLayerSettings::geometryGeneratorType = QgsWkbTypes::GeometryType::PointGeometry

The type of the result geometry of the geometry generator.

Definition at line 905 of file qgspallabeling.h.

◆ isExpression

bool QgsPalLayerSettings::isExpression

true if this label is made from a expression string, e.g., FieldName || 'mm'

See also: fieldName

Definition at line 519 of file qgspallabeling.h.

◆ labelOffsetMapUnitScale

QgsMapUnitScale QgsPalLayerSettings::labelOffsetMapUnitScale

Map unit scale for label offset.

See also: xOffset; yOffset; offsetUnits

Definition at line 760 of file qgspallabeling.h.

◆ labelPerPart

bool QgsPalLayerSettings::labelPerPart

true if every part of a multi-part feature should be labeled.

If false, only the largest part will be labeled.

Definition at line 850 of file qgspallabeling.h.

◆ layerType

QgsWkbTypes::GeometryType QgsPalLayerSettings::layerType = QgsWkbTypes::UnknownGeometry

Geometry type of layers associated with these settings.

Since: QGIS 3.10

Definition at line 914 of file qgspallabeling.h.

◆ leftDirectionSymbol

QString QgsPalLayerSettings::leftDirectionSymbol

String to use for left direction arrows.

See also: addDirectionSymbol; rightDirectionSymbol

Definition at line 585 of file qgspallabeling.h.

◆ limitNumLabels

bool QgsPalLayerSettings::limitNumLabels

true if the number of labels drawn should be limited.

See also: maxNumLabels

Definition at line 862 of file qgspallabeling.h.

◆ maxCurvedCharAngleIn

double QgsPalLayerSettings::maxCurvedCharAngleIn

Maximum angle between inside curved label characters (valid range 20.0 to 60.0).

See also: maxCurvedCharAngleOut

Definition at line 772 of file qgspallabeling.h.

◆ maxCurvedCharAngleOut

double QgsPalLayerSettings::maxCurvedCharAngleOut

Maximum angle between outside curved label characters (valid range -20.0 to -95.0)

See also: maxCurvedCharAngleIn

Definition at line 778 of file qgspallabeling.h.

◆ maximumScale

double QgsPalLayerSettings::maximumScale

The maximum map scale (i.e.

most "zoomed in" scale) at which the labels will be visible. The scale value indicates the scale denominator, e.g. 1000.0 for a 1:1000 map. A scale of 0 indicates no maximum scale visibility.

This setting is only considered if scaleVisibility is true.

See also: minimumScale; scaleVisibility

Definition at line 805 of file qgspallabeling.h.

◆ maxNumLabels

int QgsPalLayerSettings::maxNumLabels

The maximum number of labels which should be drawn for this layer.

This only has an effect if limitNumLabels is true.

See also: limitNumLabels

Definition at line 869 of file qgspallabeling.h.

◆ mCurFeat

const QgsFeature* QgsPalLayerSettings::mCurFeat = nullptr

Definition at line 1025 of file qgspallabeling.h.

◆ mCurFields

QgsFields QgsPalLayerSettings::mCurFields

Definition at line 1026 of file qgspallabeling.h.

◆ mergeLines

bool QgsPalLayerSettings::mergeLines

true if connected line features with identical label text should be merged prior to generating label positions.

Definition at line 856 of file qgspallabeling.h.

◆ mFeatsRegPal

int QgsPalLayerSettings::mFeatsRegPal = 0

Definition at line 1036 of file qgspallabeling.h.

◆ mFeatsSendingToPal

int QgsPalLayerSettings::mFeatsSendingToPal = 0

Definition at line 1035 of file qgspallabeling.h.

◆ mFeaturesToLabel

int QgsPalLayerSettings::mFeaturesToLabel = 0

Definition at line 1034 of file qgspallabeling.h.

◆ minFeatureSize

double QgsPalLayerSettings::minFeatureSize

Minimum feature size (in millimeters) for a feature to be labelled.

Definition at line 874 of file qgspallabeling.h.

◆ minimumScale

double QgsPalLayerSettings::minimumScale

The minimum map scale (i.e.

most "zoomed out" scale) at which the labels will be visible. The scale value indicates the scale denominator, e.g. 1000.0 for a 1:1000 map. A scale of 0 indicates no minimum scale visibility.

This setting is only considered if scaleVisibility is true.

See also: maximumScale; scaleVisibility

Definition at line 817 of file qgspallabeling.h.

◆ multilineAlign

MultiLineAlign QgsPalLayerSettings::multilineAlign

Horizontal alignment of multi-line labels.

Definition at line 566 of file qgspallabeling.h.

◆ obstacle

bool QgsPalLayerSettings::obstacle

true if features for layer are obstacles to labels of other layers.

See also: obstacleFactor; obstacleType

Definition at line 881 of file qgspallabeling.h.

◆ obstacleFactor

double QgsPalLayerSettings::obstacleFactor

Obstacle factor, where 1.0 = default, < 1.0 more likely to be covered by labels,

1.0 less likely to be covered

See also: obstacle; obstacleType

Definition at line 889 of file qgspallabeling.h.

◆ obstacleType

ObstacleType QgsPalLayerSettings::obstacleType

Controls how features act as obstacles for labels.

See also: obstacle; obstacleFactor

Definition at line 896 of file qgspallabeling.h.

◆ offsetType

OffsetType QgsPalLayerSettings::offsetType

Offset type for layer (only applies in certain placement modes)

Definition at line 678 of file qgspallabeling.h.

◆ offsetUnits

QgsUnitTypes::RenderUnit QgsPalLayerSettings::offsetUnits

Units for offsets of label.

See also: xOffset; yOffset; labelOffsetMapUnitScale

Definition at line 752 of file qgspallabeling.h.

◆ overrunDistance

double QgsPalLayerSettings::overrunDistance = 0

Distance which labels are allowed to overrun past the start or end of line features.

See also: overrunDistanceUnit; repeatDistanceMapUnitScale

Since: QGIS 3.10

Definition at line 707 of file qgspallabeling.h.

◆ overrunDistanceMapUnitScale

QgsMapUnitScale QgsPalLayerSettings::overrunDistanceMapUnitScale

Map unit scale for label overrun distance.

See also: overrunDistance; overrunDistanceUnit

Since: QGIS 3.10

Definition at line 723 of file qgspallabeling.h.

◆ overrunDistanceUnit

QgsUnitTypes::RenderUnit QgsPalLayerSettings::overrunDistanceUnit = QgsUnitTypes::RenderMillimeters

Units for label overrun distance.

See also: overrunDistance; overrunDistanceMapUnitScale

Since: QGIS 3.10

Definition at line 715 of file qgspallabeling.h.

◆ placeDirectionSymbol

DirectionSymbols QgsPalLayerSettings::placeDirectionSymbol

Placement option for direction symbols.

Controls whether to place symbols to the left/right, above or below label.

See also: addDirectionSymbol

Definition at line 598 of file qgspallabeling.h.

◆ placement

Placement QgsPalLayerSettings::placement

Definition at line 627 of file qgspallabeling.h.

◆ placementFlags

unsigned int QgsPalLayerSettings::placementFlags

Definition at line 628 of file qgspallabeling.h.

◆ plusSign

bool QgsPalLayerSettings::plusSign

Whether '+' signs should be prepended to positive numeric labels.

formatNumbers must be true for this setting to have an effect.

See also: formatNumbers

Definition at line 623 of file qgspallabeling.h.

◆ predefinedPositionOrder

QVector< PredefinedPointPosition > QgsPalLayerSettings::predefinedPositionOrder

Ordered list of predefined label positions for points.

Positions earlier in the list will be prioritized over later positions. Only used when the placement is set to QgsPalLayerSettings::OrderedPositionsAroundPoint.

Note: not available in Python bindings

Definition at line 649 of file qgspallabeling.h.

◆ preserveRotation

bool QgsPalLayerSettings::preserveRotation

True if label rotation should be preserved during label pin/unpin operations.

Definition at line 766 of file qgspallabeling.h.

◆ previewBkgrdColor

Q_DECL_DEPRECATED QColor QgsPalLayerSettings::previewBkgrdColor = Qt::white

Deprecated:: since QGIS 3.10.

Use QgsTextFormat::previewBackgroundColor() instead.

Definition at line 529 of file qgspallabeling.h.

◆ priority

int QgsPalLayerSettings::priority

Label priority.

Valid ranges are from 0 to 10, where 0 = lowest priority and 10 = highest priority.

Definition at line 784 of file qgspallabeling.h.

◆ ptOne

QgsPointXY QgsPalLayerSettings::ptOne

Definition at line 1032 of file qgspallabeling.h.

◆ ptZero

QgsPointXY QgsPalLayerSettings::ptZero

Definition at line 1031 of file qgspallabeling.h.

◆ quadOffset

QuadrantPosition QgsPalLayerSettings::quadOffset

Sets the quadrant in which to offset labels from feature.

Definition at line 728 of file qgspallabeling.h.

◆ repeatDistance

double QgsPalLayerSettings::repeatDistance

Distance for repeating labels for a single feature.

See also: repeatDistanceUnit; repeatDistanceMapUnitScale

Definition at line 685 of file qgspallabeling.h.

◆ repeatDistanceMapUnitScale

QgsMapUnitScale QgsPalLayerSettings::repeatDistanceMapUnitScale

Map unit scale for repeating labels for a single feature.

See also: repeatDistance; repeatDistanceUnit

Definition at line 699 of file qgspallabeling.h.

◆ repeatDistanceUnit

QgsUnitTypes::RenderUnit QgsPalLayerSettings::repeatDistanceUnit

Units for repeating labels for a single feature.

See also: repeatDistance; repeatDistanceMapUnitScale

Definition at line 692 of file qgspallabeling.h.

◆ reverseDirectionSymbol

bool QgsPalLayerSettings::reverseDirectionSymbol

True if direction symbols should be reversed.

Definition at line 601 of file qgspallabeling.h.

◆ rightDirectionSymbol

QString QgsPalLayerSettings::rightDirectionSymbol

String to use for right direction arrows.

See also: addDirectionSymbol; leftDirectionSymbol

Definition at line 592 of file qgspallabeling.h.

◆ scaleVisibility

bool QgsPalLayerSettings::scaleVisibility

Set to true to limit label visibility to a range of scales.

See also: maximumScale; minimumScale

Definition at line 793 of file qgspallabeling.h.

◆ substitutions

QgsStringReplacementCollection QgsPalLayerSettings::substitutions

Substitution collection for automatic text substitution with labels.

Definition at line 532 of file qgspallabeling.h.

◆ upsidedownLabels

UpsideDownLabels QgsPalLayerSettings::upsidedownLabels = Upright

Controls whether upside down labels are displayed and how they are handled.

Definition at line 844 of file qgspallabeling.h.

◆ useMaxLineLengthForAutoWrap

bool QgsPalLayerSettings::useMaxLineLengthForAutoWrap = true

If true, indicates that when auto wrapping label text the autoWrapLength length indicates the maximum ideal length of text lines.

If false, then autoWrapLength indicates the ideal minimum length of text lines.

If autoWrapLength is 0 then this value has no effect.

See also: autoWrapLength

Since: QGIS 3.4

Definition at line 563 of file qgspallabeling.h.

◆ useSubstitutions

bool QgsPalLayerSettings::useSubstitutions

True if substitutions should be applied.

Definition at line 534 of file qgspallabeling.h.

◆ wrapChar

QString QgsPalLayerSettings::wrapChar

Wrapping character string.

If set, any occurrences of this string in the calculated label text will be replaced with new line characters.

Definition at line 542 of file qgspallabeling.h.

◆ xform

const QgsMapToPixel* QgsPalLayerSettings::xform = nullptr

Definition at line 1028 of file qgspallabeling.h.

◆ xOffset

double QgsPalLayerSettings::xOffset

Horizontal offset of label.

Units are specified via offsetUnits.

See also: yOffset; offsetUnits; labelOffsetMapUnitScale

Definition at line 736 of file qgspallabeling.h.

◆ yOffset

double QgsPalLayerSettings::yOffset

Vertical offset of label.

Units are specified via offsetUnits.

See also: xOffset; offsetUnits; labelOffsetMapUnitScale

Definition at line 744 of file qgspallabeling.h.

◆ zIndex

double QgsPalLayerSettings::zIndex

Z-Index of label, where labels with a higher z-index are rendered on top of labels with a lower z-index.

Definition at line 899 of file qgspallabeling.h.

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

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

Public Types

Public Member Functions

Static Public Member Functions

Public Attributes

Friends

Detailed Description

Member Enumeration Documentation

◆ DirectionSymbols

◆ LinePlacementFlags

◆ MultiLineAlign

◆ ObstacleType

◆ OffsetType

◆ Placement

◆ PredefinedPointPosition

◆ Property

◆ QuadrantPosition

◆ UpsideDownLabels

Constructor & Destructor Documentation

◆ QgsPalLayerSettings() [1/2]

◆ QgsPalLayerSettings() [2/2]

◆ ~QgsPalLayerSettings()

Member Function Documentation

◆ calculateLabelSize()

◆ callout()

◆ dataDefinedProperties() [1/2]

◆ dataDefinedProperties() [2/2]

◆ format()

◆ getLabelExpression()

◆ labelSettingsPreviewPixmap()

◆ operator=()

◆ prepare()

◆ propertyDefinitions()

◆ readXml()

◆ registerFeature()

◆ setCallout()

◆ setDataDefinedProperties()

◆ setFormat()

◆ startRender()

◆ stopRender()

◆ writeXml()

Friends And Related Function Documentation

◆ QgsVectorLayer

Member Data Documentation

◆ addDirectionSymbol

◆ angleOffset

◆ autoWrapLength

◆ centroidInside

◆ centroidWhole

◆ ct

◆ decimals

◆ displayAll

◆ dist

◆ distMapUnitScale

◆ distUnits

◆ drawLabels

◆ extentGeom

◆ fieldIndex

◆ fieldName

◆ fitInPolygonOnly

◆ fontLimitPixelSize

◆ fontMaxPixelSize

◆ fontMinPixelSize

◆ formatNumbers

◆ geometryGenerator

◆ geometryGeneratorEnabled

◆ geometryGeneratorType

◆ isExpression

◆ labelOffsetMapUnitScale

◆ labelPerPart

◆ layerType

◆ leftDirectionSymbol

◆ limitNumLabels

◆ maxCurvedCharAngleIn

◆ maxCurvedCharAngleOut

◆ maximumScale

◆ maxNumLabels

◆ mCurFeat

◆ mCurFields

◆ mergeLines

◆ mFeatsRegPal