A fill symbol layer which places markers at random locations within polygons. More...

#include <qgsfillsymbollayer.h>

Inheritance diagram for QgsRandomMarkerFillSymbolLayer:

Public Types
enum	CountMethod { AbsoluteCount , DensityBasedCount }
	Methods to define the number of points randomly filling the polygon. More...

Public Types inherited from QgsSymbolLayer
enum	Property { PropertySize = 0 , PropertyAngle , PropertyName , PropertyFillColor , PropertyStrokeColor , PropertyStrokeWidth , PropertyStrokeStyle , PropertyOffset , PropertyCharacter , PropertyWidth , PropertyHeight , PropertyPreserveAspectRatio , PropertyFillStyle , PropertyJoinStyle , PropertySecondaryColor , PropertyLineAngle , PropertyLineDistance , PropertyGradientType , PropertyCoordinateMode , PropertyGradientSpread , PropertyGradientReference1X , PropertyGradientReference1Y , PropertyGradientReference2X , PropertyGradientReference2Y , PropertyGradientReference1IsCentroid , PropertyGradientReference2IsCentroid , PropertyBlurRadius , PropertyShapeburstUseWholeShape , PropertyShapeburstMaxDistance , PropertyShapeburstIgnoreRings , PropertyFile , PropertyDistanceX , PropertyDistanceY , PropertyDisplacementX , PropertyDisplacementY , PropertyOpacity , PropertyCustomDash , PropertyCapStyle , PropertyPlacement , PropertyInterval , PropertyOffsetAlongLine , PropertyAverageAngleLength , PropertyHorizontalAnchor , PropertyVerticalAnchor , PropertyLayerEnabled , PropertyArrowWidth , PropertyArrowStartWidth , PropertyArrowHeadLength , PropertyArrowHeadThickness , PropertyArrowHeadType , PropertyArrowType , PropertyOffsetX , PropertyOffsetY , PropertyPointCount , PropertyRandomSeed , PropertyClipPoints , PropertyDensityArea , PropertyFontFamily , PropertyFontStyle , PropertyDashPatternOffset , PropertyTrimStart , PropertyTrimEnd , PropertyLineStartWidthValue , PropertyLineEndWidthValue , PropertyLineStartColorValue , PropertyLineEndColorValue }
	Data definable properties. More...

Public Member Functions
	QgsRandomMarkerFillSymbolLayer (int pointCount=10, CountMethod method=AbsoluteCount, double densityArea=250.0, unsigned long seed=0)
	Constructor for QgsRandomMarkerFillSymbolLayer, with the specified pointCount. More...

	~QgsRandomMarkerFillSymbolLayer () override

bool	canCauseArtifactsBetweenAdjacentTiles () const override
	Returns `true` if the symbol layer rendering can cause visible artifacts across a single feature when the feature is rendered as a series of adjacent map tiles each containing a portion of the feature's geometry. More...

bool	clipPoints () const
	Returns `true` if point markers should be clipped to the polygon boundary. More...

QgsRandomMarkerFillSymbolLayer *	clone () const override
	Shall be reimplemented by subclasses to create a deep copy of the instance. More...

QColor	color () const override
	The fill color. More...

CountMethod	countMethod () const
	Returns the count method used to randomly fill the polygon. More...

double	densityArea () const
	Returns the density area used to count the number of points to randomly fill the polygon. More...

QgsUnitTypes::RenderUnit	densityAreaUnit () const
	Returns the units for the density area. More...

const QgsMapUnitScale &	densityAreaUnitScale () const
	Returns the map scale for the density area. More...

bool	hasDataDefinedProperties () const override
	Returns `true` if the symbol layer (or any of its sub-symbols) contains data defined properties. More...

QString	layerType () const override
	Returns a string that represents this layer type. More...

QgsMapUnitScale	mapUnitScale () const override

QgsUnitTypes::RenderUnit	outputUnit () const override
	Returns the units to use for sizes and widths within the symbol layer. More...

int	pointCount () const
	Returns the count of random points to render in the fill. More...

QVariantMap	properties () const override
	Should be reimplemented by subclasses to return a string map that contains the configuration information for the symbol layer. More...

void	renderPolygon (const QPolygonF &points, const QVector< QPolygonF > *rings, QgsSymbolRenderContext &context) override
	Renders the fill symbol layer for the polygon whose outer ring is defined by points, using the given render context. More...

unsigned long	seed () const
	Returns the random number seed to use when generating points, or 0 if a truly random sequence will be used (causing points to appear in different locations with every map refresh). More...

void	setClipPoints (bool clipped)
	Sets whether point markers should be clipped to the polygon boundary. More...

void	setColor (const QColor &color) override
	The fill color. More...

void	setCountMethod (CountMethod method)
	Sets the count method used to randomly fill the polygon. More...

void	setDensityArea (double area)
	Sets the density area used to count the number of points to randomly fill the polygon. More...

void	setDensityAreaUnit (QgsUnitTypes::RenderUnit unit)
	Sets the units for the density area. More...

void	setDensityAreaUnitScale (const QgsMapUnitScale &scale)
	Sets the map scale for the density area. More...

void	setMapUnitScale (const QgsMapUnitScale &scale) override

void	setOutputUnit (QgsUnitTypes::RenderUnit unit) override
	Sets the units to use for sizes and widths within the symbol layer. More...

void	setPointCount (int count)
	Sets the count of random points to render in the fill. More...

void	setSeed (unsigned long seed)
	Sets the random number seed to use when generating points, or 0 if a truly random sequence will be used on every rendering (causing points to appear in different locations with every map refresh). More...

bool	setSubSymbol (QgsSymbol *symbol) override
	Sets layer's subsymbol. takes ownership of the passed symbol. More...

void	startFeatureRender (const QgsFeature &feature, QgsRenderContext &context) override
	Called before the layer will be rendered for a particular feature. More...

void	startRender (QgsSymbolRenderContext &context) override
	Called before a set of rendering operations commences on the supplied render context. More...

void	stopFeatureRender (const QgsFeature &feature, QgsRenderContext &context) override
	Called after the layer has been rendered for a particular feature. More...

void	stopRender (QgsSymbolRenderContext &context) override
	Called after a set of rendering operations has finished on the supplied render context. More...

QgsSymbol *	subSymbol () override
	Returns the symbol's sub symbol, if present. More...

QSet< QString >	usedAttributes (const QgsRenderContext &context) const override
	Returns the set of attributes referenced by the layer. More...

bool	usesMapUnits () const override
	Returns `true` if the symbol layer has any components which use map unit based sizes. More...

Public Member Functions inherited from QgsFillSymbolLayer
	QgsFillSymbolLayer (const QgsFillSymbolLayer &other)=delete
	QgsFillSymbolLayer cannot be copied. More...

double	angle () const

void	drawPreviewIcon (QgsSymbolRenderContext &context, QSize size) override

QgsFillSymbolLayer &	operator= (const QgsFillSymbolLayer &other)=delete
	QgsFillSymbolLayer cannot be copied. More...

void	setAngle (double angle)

Public Member Functions inherited from QgsSymbolLayer
	QgsSymbolLayer (const QgsSymbolLayer &other)=delete
	QgsSymbolLayer cannot be copied. More...

virtual	~QgsSymbolLayer ()

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

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

virtual double	dxfAngle (QgsSymbolRenderContext &context) const
	Gets angle. More...

virtual QColor	dxfBrushColor (QgsSymbolRenderContext &context) const
	Gets brush/fill color. More...

virtual Qt::BrushStyle	dxfBrushStyle () const
	Gets brush/fill style. More...

virtual QColor	dxfColor (QgsSymbolRenderContext &context) const
	Gets color. More...

virtual QVector< qreal >	dxfCustomDashPattern (QgsUnitTypes::RenderUnit &unit) const
	Gets dash pattern. More...

virtual double	dxfOffset (const QgsDxfExport &e, QgsSymbolRenderContext &context) const
	Gets offset. More...

virtual Qt::PenStyle	dxfPenStyle () const
	Gets pen style. More...

virtual double	dxfWidth (const QgsDxfExport &e, QgsSymbolRenderContext &context) const
	Gets line width. More...

bool	enabled () const
	Returns `true` if symbol layer is enabled and will be drawn. More...

virtual double	estimateMaxBleed (const QgsRenderContext &context) const
	Returns the estimated maximum distance which the layer style will bleed outside the drawn shape when drawn in the specified /a context. More...

virtual QColor	fillColor () const
	Gets fill color. More...

virtual Qgis::SymbolLayerFlags	flags () const
	Returns flags which control the symbol layer's behavior. More...

virtual bool	isCompatibleWithSymbol (QgsSymbol *symbol) const
	Returns if the layer can be used below the specified symbol. More...

bool	isLocked () const
	Returns `true` if the symbol layer colors are locked and the layer will ignore any symbol-level color changes. More...

virtual QList< QgsSymbolLayerReference >	masks () const
	Returns masks defined by this symbol layer. More...

virtual QString	ogrFeatureStyle (double mmScaleFactor, double mapUnitScaleFactor) const

QgsSymbolLayer &	operator= (const QgsSymbolLayer &other)=delete
	QgsSymbolLayer cannot be copied. More...

QgsPaintEffect *	paintEffect () const
	Returns the current paint effect for the layer. More...

virtual void	prepareExpressions (const QgsSymbolRenderContext &context)
	Prepares all data defined property expressions for evaluation. More...

int	renderingPass () const
	Specifies the rendering pass in which this symbol layer should be rendered. More...

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

virtual void	setDataDefinedProperty (Property key, const QgsProperty &property)
	Sets a data defined property for the layer. More...

void	setEnabled (bool enabled)
	Sets whether symbol layer is enabled and should be drawn. More...

virtual void	setFillColor (const QColor &color)
	Set fill color. More...

void	setLocked (bool locked)
	Sets whether the layer's colors are locked. More...

void	setPaintEffect (QgsPaintEffect *effect)
	Sets the current paint effect for the layer. More...

void	setRenderingPass (int renderingPass)
	Specifies the rendering pass in which this symbol layer should be rendered. More...

virtual void	setStrokeColor (const QColor &color)
	Set stroke color. More...

virtual QColor	strokeColor () const
	Gets stroke color. More...

virtual void	toSld (QDomDocument &doc, QDomElement &element, const QVariantMap &props) const
	Saves the symbol layer as SLD. More...

Qgis::SymbolType	type () const

virtual bool	writeDxf (QgsDxfExport &e, double mmMapUnitScaleFactor, const QString &layerName, QgsSymbolRenderContext &context, QPointF shift=QPointF(0.0, 0.0)) const
	write as DXF More...

Static Public Member Functions
static QgsSymbolLayer *	create (const QVariantMap &properties=QVariantMap())
	Creates a new QgsRandomMarkerFillSymbolLayer using the specified properties map containing symbol properties (see properties()). More...

Static Public Member Functions inherited from QgsSymbolLayer
static const QgsPropertiesDefinition &	propertyDefinitions ()
	Returns the symbol layer property definitions. More...

Additional Inherited Members
Protected Member Functions inherited from QgsFillSymbolLayer
	QgsFillSymbolLayer (bool locked=false)

void	_renderPolygon (QPainter p, const QPolygonF &points, const QVector< QPolygonF > rings, QgsSymbolRenderContext &context)
	Default method to render polygon. More...

Protected Member Functions inherited from QgsSymbolLayer
	QgsSymbolLayer (Qgis::SymbolType type, bool locked=false)
	Constructor for QgsSymbolLayer. More...

void	copyDataDefinedProperties (QgsSymbolLayer *destLayer) const
	Copies all data defined properties of this layer to another symbol layer. More...

void	copyPaintEffect (QgsSymbolLayer *destLayer) const
	Copies paint effect of this layer to another symbol layer. More...

void	restoreOldDataDefinedProperties (const QVariantMap &stringMap)
	Restores older data defined properties from string map. More...

Protected Attributes inherited from QgsFillSymbolLayer
double	mAngle = 0.0

Protected Attributes inherited from QgsSymbolLayer
QColor	mColor

QgsPropertyCollection	mDataDefinedProperties

bool	mEnabled = true
	True if layer is enabled and should be drawn. More...

QgsFields	mFields

bool	mLocked = false

std::unique_ptr< QgsPaintEffect >	mPaintEffect

int	mRenderingPass = 0

Qgis::SymbolType	mType

Static Protected Attributes inherited from QgsSymbolLayer
static const bool	SELECT_FILL_BORDER = false
	Whether fill styles for selected features also highlight symbol stroke. More...

static const bool	SELECT_FILL_STYLE = false
	Whether fill styles for selected features uses symbol layer style. More...

static const bool	SELECTION_IS_OPAQUE = true
	Whether styles for selected features ignore symbol alpha. More...

Detailed Description

A fill symbol layer which places markers at random locations within polygons.

Since: QGIS 3.12

Definition at line 1833 of file qgsfillsymbollayer.h.

Member Enumeration Documentation

◆ CountMethod

enum QgsRandomMarkerFillSymbolLayer::CountMethod

Methods to define the number of points randomly filling the polygon.

Enumerator
AbsoluteCount	The point count is used as an absolute count of markers.
DensityBasedCount	The point count is part of a marker density count.

Definition at line 1838 of file qgsfillsymbollayer.h.

Constructor & Destructor Documentation

◆ QgsRandomMarkerFillSymbolLayer()

QgsRandomMarkerFillSymbolLayer::QgsRandomMarkerFillSymbolLayer	(	int	pointCount = `10`,
		CountMethod	method = `AbsoluteCount`,
		double	densityArea = `250.0`,
		unsigned long	seed = `0`
	)

Constructor for QgsRandomMarkerFillSymbolLayer, with the specified pointCount.

Optionally a specific random number seed can be used when generating points. A seed of 0 indicates that a truly random sequence will be used on every rendering, causing points to appear in different locations with every map refresh.

Definition at line 4453 of file qgsfillsymbollayer.cpp.

◆ ~QgsRandomMarkerFillSymbolLayer()

QgsRandomMarkerFillSymbolLayer::~QgsRandomMarkerFillSymbolLayer ( )

overridedefault

Member Function Documentation

◆ canCauseArtifactsBetweenAdjacentTiles()

bool QgsRandomMarkerFillSymbolLayer::canCauseArtifactsBetweenAdjacentTiles ( ) const

overridevirtual

Returns true if the symbol layer rendering can cause visible artifacts across a single feature when the feature is rendered as a series of adjacent map tiles each containing a portion of the feature's geometry.

The default implementation returns false.

Since: QGIS 3.18

Reimplemented from QgsSymbolLayer.

Definition at line 4689 of file qgsfillsymbollayer.cpp.

◆ clipPoints()

bool QgsRandomMarkerFillSymbolLayer::clipPoints ( ) const

Returns true if point markers should be clipped to the polygon boundary.

See also: setClipPoints()

Definition at line 4751 of file qgsfillsymbollayer.cpp.

◆ clone()

QgsRandomMarkerFillSymbolLayer * QgsRandomMarkerFillSymbolLayer::clone ( ) const

overridevirtual

Shall be reimplemented by subclasses to create a deep copy of the instance.

Implements QgsSymbolLayer.

Definition at line 4675 of file qgsfillsymbollayer.cpp.

◆ color()

QColor QgsRandomMarkerFillSymbolLayer::color ( ) const

overridevirtual

The fill color.

Reimplemented from QgsSymbolLayer.

Definition at line 4509 of file qgsfillsymbollayer.cpp.

◆ countMethod()

QgsRandomMarkerFillSymbolLayer::CountMethod QgsRandomMarkerFillSymbolLayer::countMethod ( ) const

Returns the count method used to randomly fill the polygon.

See also: setCountMethod()

Definition at line 4761 of file qgsfillsymbollayer.cpp.

◆ create()

QgsSymbolLayer * QgsRandomMarkerFillSymbolLayer::create ( const QVariantMap & properties = QVariantMap() )

static

Creates a new QgsRandomMarkerFillSymbolLayer using the specified properties map containing symbol properties (see properties()).

Caller takes ownership of the returned symbol layer.

Definition at line 4464 of file qgsfillsymbollayer.cpp.

◆ densityArea()

double QgsRandomMarkerFillSymbolLayer::densityArea ( ) const

Returns the density area used to count the number of points to randomly fill the polygon.

Only used when the count method is set to QgsRandomMarkerFillSymbolLayer::DensityBasedCount.

Units are specified by setDensityAreaUnit().

See also: setDensityArea()

Definition at line 4771 of file qgsfillsymbollayer.cpp.

◆ densityAreaUnit()

QgsUnitTypes::RenderUnit QgsRandomMarkerFillSymbolLayer::densityAreaUnit ( ) const

inline

Returns the units for the density area.

See also: setDensityAreaUnit()

Definition at line 1972 of file qgsfillsymbollayer.h.

◆ densityAreaUnitScale()

const QgsMapUnitScale& QgsRandomMarkerFillSymbolLayer::densityAreaUnitScale ( ) const

inline

Returns the map scale for the density area.

See also: setDensityAreaUnitScale(); densityArea(); densityAreaUnit()

Definition at line 1989 of file qgsfillsymbollayer.h.

◆ hasDataDefinedProperties()

bool QgsRandomMarkerFillSymbolLayer::hasDataDefinedProperties ( ) const

overridevirtual

Returns true if the symbol layer (or any of its sub-symbols) contains data defined properties.

Since: QGIS 3.4.5

Reimplemented from QgsSymbolLayer.

Definition at line 4722 of file qgsfillsymbollayer.cpp.

◆ layerType()

QString QgsRandomMarkerFillSymbolLayer::layerType ( ) const

overridevirtual

Returns a string that represents this layer type.

Used for serialization. Should match with the string used to register this symbol layer in the registry.

Implements QgsSymbolLayer.

Definition at line 4498 of file qgsfillsymbollayer.cpp.

◆ mapUnitScale()

QgsMapUnitScale QgsRandomMarkerFillSymbolLayer::mapUnitScale ( ) const

overridevirtual

Reimplemented from QgsSymbolLayer.

Definition at line 4835 of file qgsfillsymbollayer.cpp.

◆ outputUnit()

QgsUnitTypes::RenderUnit QgsRandomMarkerFillSymbolLayer::outputUnit ( ) const

overridevirtual

Returns the units to use for sizes and widths within the symbol layer.

Individual symbol layer subclasses will interpret this in different ways, e.g., a marker symbol layer may use it to specify the units for the marker size, while a line symbol layer may use it to specify the units for the line width.

Returns: output unit, or QgsUnitTypes::RenderUnknownUnit if the symbol layer contains mixed units

See also: setOutputUnit()

Reimplemented from QgsSymbolLayer.

Definition at line 4809 of file qgsfillsymbollayer.cpp.

◆ pointCount()

int QgsRandomMarkerFillSymbolLayer::pointCount ( ) const

Returns the count of random points to render in the fill.

See also: setPointCount()

Definition at line 4731 of file qgsfillsymbollayer.cpp.

◆ properties()

QVariantMap QgsRandomMarkerFillSymbolLayer::properties ( ) const

overridevirtual

Should be reimplemented by subclasses to return a string map that contains the configuration information for the symbol layer.

This is used to serialize a symbol layer perstistently.

Implements QgsSymbolLayer.

Definition at line 4662 of file qgsfillsymbollayer.cpp.

◆ renderPolygon()

void QgsRandomMarkerFillSymbolLayer::renderPolygon	(	const QPolygonF &	points,
		const QVector< QPolygonF > *	rings,
		QgsSymbolRenderContext &	context
	)

overridevirtual

Renders the fill symbol layer for the polygon whose outer ring is defined by points, using the given render context.

The rings argument optionally specifies a list of polygon rings to render as holes.

Implements QgsFillSymbolLayer.

Definition at line 4524 of file qgsfillsymbollayer.cpp.

◆ seed()

unsigned long QgsRandomMarkerFillSymbolLayer::seed ( ) const

Returns the random number seed to use when generating points, or 0 if a truly random sequence will be used (causing points to appear in different locations with every map refresh).

See also: setSeed()

Definition at line 4741 of file qgsfillsymbollayer.cpp.

◆ setClipPoints()

void QgsRandomMarkerFillSymbolLayer::setClipPoints ( bool clipped )

Sets whether point markers should be clipped to the polygon boundary.

See also: clipPoints()

Definition at line 4756 of file qgsfillsymbollayer.cpp.

◆ setColor()

void QgsRandomMarkerFillSymbolLayer::setColor ( const QColor & color )

overridevirtual

The fill color.

Reimplemented from QgsSymbolLayer.

Definition at line 4503 of file qgsfillsymbollayer.cpp.

◆ setCountMethod()

void QgsRandomMarkerFillSymbolLayer::setCountMethod ( CountMethod method )

Sets the count method used to randomly fill the polygon.

See also: countMethod()

Definition at line 4766 of file qgsfillsymbollayer.cpp.

◆ setDensityArea()

void QgsRandomMarkerFillSymbolLayer::setDensityArea ( double area )

Sets the density area used to count the number of points to randomly fill the polygon.

See also: densityArea()

Definition at line 4776 of file qgsfillsymbollayer.cpp.

◆ setDensityAreaUnit()

void QgsRandomMarkerFillSymbolLayer::setDensityAreaUnit ( QgsUnitTypes::RenderUnit unit )

inline

Sets the units for the density area.

Parameters

unit	width units

See also: densityAreaUnit()

Definition at line 1966 of file qgsfillsymbollayer.h.

◆ setDensityAreaUnitScale()

void QgsRandomMarkerFillSymbolLayer::setDensityAreaUnitScale ( const QgsMapUnitScale & scale )

inline

Sets the map scale for the density area.

Parameters

scale density area map unit scale

See also: densityAreaUnitScale(); setDensityArea(); setDensityAreaUnit()

Definition at line 1981 of file qgsfillsymbollayer.h.

◆ setMapUnitScale()

void QgsRandomMarkerFillSymbolLayer::setMapUnitScale ( const QgsMapUnitScale & scale )

overridevirtual

Reimplemented from QgsSymbolLayer.

Definition at line 4827 of file qgsfillsymbollayer.cpp.

◆ setOutputUnit()

void QgsRandomMarkerFillSymbolLayer::setOutputUnit ( QgsUnitTypes::RenderUnit unit )

overridevirtual

Sets the units to use for sizes and widths within the symbol layer.

Individual symbol layer subclasses will interpret this in different ways, e.g., a marker symbol layer may use it to specify the units for the marker size, while a line symbol layer may use it to specify the units for the line width.

Parameters

unit	output units

See also: outputUnit()

Reimplemented from QgsSymbolLayer.

Definition at line 4801 of file qgsfillsymbollayer.cpp.

◆ setPointCount()

void QgsRandomMarkerFillSymbolLayer::setPointCount ( int count )

Sets the count of random points to render in the fill.

See also: pointCount()

Definition at line 4736 of file qgsfillsymbollayer.cpp.

◆ setSeed()

void QgsRandomMarkerFillSymbolLayer::setSeed ( unsigned long seed )

Sets the random number seed to use when generating points, or 0 if a truly random sequence will be used on every rendering (causing points to appear in different locations with every map refresh).

See also: seed()

Definition at line 4746 of file qgsfillsymbollayer.cpp.

◆ setSubSymbol()

bool QgsRandomMarkerFillSymbolLayer::setSubSymbol ( QgsSymbol * symbol )

overridevirtual

Sets layer's subsymbol. takes ownership of the passed symbol.

Reimplemented from QgsSymbolLayer.

Definition at line 4699 of file qgsfillsymbollayer.cpp.

◆ startFeatureRender()

void QgsRandomMarkerFillSymbolLayer::startFeatureRender	(	const QgsFeature &	feature,
		QgsRenderContext &	context
	)

overridevirtual

Called before the layer will be rendered for a particular feature.

This is always followed by a call to stopFeatureRender() after the feature has been completely rendered (i.e. all parts have been rendered).

The default implementation does nothing.

Note: In some circumstances, startFeatureRender() and stopFeatureRender() may not be called before a symbol layer is rendered. E.g., when a symbol layer is being rendered in isolation and not as a result of rendering a feature (for instance, when rendering a legend patch or other non-feature based shape).

See also: stopFeatureRender(); startRender()

Since: QGIS 3.12

Reimplemented from QgsSymbolLayer.

Definition at line 4781 of file qgsfillsymbollayer.cpp.

◆ startRender()

void QgsRandomMarkerFillSymbolLayer::startRender ( QgsSymbolRenderContext & context )

overridevirtual

Called before a set of rendering operations commences on the supplied render context.

This is always followed by a call to stopRender() after all rendering operations have been completed.

Subclasses can use this method to prepare for a set of rendering operations, e.g. by pre-evaluating paths or images to render, and performing other one-time optimisations.

See also: startFeatureRender(); stopRender()

Implements QgsSymbolLayer.

Definition at line 4514 of file qgsfillsymbollayer.cpp.

◆ stopFeatureRender()

void QgsRandomMarkerFillSymbolLayer::stopFeatureRender	(	const QgsFeature &	feature,
		QgsRenderContext &	context
	)

overridevirtual

Called after the layer has been rendered for a particular feature.

This is always preceded by a call to startFeatureRender() just before the feature will be rendered.

The default implementation does nothing.

Note: In some circumstances, startFeatureRender() and stopFeatureRender() may not be called before a symbol layer is rendered. E.g., when a symbol layer is being rendered in isolation and not as a result of rendering a feature (for instance, when rendering a legend patch or other non-feature based shape).

See also: startFeatureRender(); stopRender()

Since: QGIS 3.12

Reimplemented from QgsSymbolLayer.

Definition at line 4787 of file qgsfillsymbollayer.cpp.

◆ stopRender()

void QgsRandomMarkerFillSymbolLayer::stopRender ( QgsSymbolRenderContext & context )

overridevirtual

Called after a set of rendering operations has finished on the supplied render context.

This is always preceded by a call to startRender() before all rendering operations are commenced.

Subclasses can use this method to cleanup after a set of rendering operations.

See also: startRender(); stopFeatureRender()

Implements QgsSymbolLayer.

Definition at line 4519 of file qgsfillsymbollayer.cpp.

◆ subSymbol()

QgsSymbol * QgsRandomMarkerFillSymbolLayer::subSymbol ( )

overridevirtual

Returns the symbol's sub symbol, if present.

Reimplemented from QgsSymbolLayer.

Definition at line 4694 of file qgsfillsymbollayer.cpp.

◆ usedAttributes()

QSet< QString > QgsRandomMarkerFillSymbolLayer::usedAttributes ( const QgsRenderContext & context ) const

overridevirtual

Returns the set of attributes referenced by the layer.

This includes attributes required by any data defined properties associated with the layer.

Reimplemented from QgsSymbolLayer.

Definition at line 4712 of file qgsfillsymbollayer.cpp.

◆ usesMapUnits()

bool QgsRandomMarkerFillSymbolLayer::usesMapUnits ( ) const

overridevirtual

Returns true if the symbol layer has any components which use map unit based sizes.

Since: QGIS 3.18

Reimplemented from QgsSymbolLayer.

Definition at line 4818 of file qgsfillsymbollayer.cpp.

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

/build/qgis-3.22.4+99unstable/src/core/symbology/qgsfillsymbollayer.h
/build/qgis-3.22.4+99unstable/src/core/symbology/qgsfillsymbollayer.cpp

Public Types

Public Member Functions

Static Public Member Functions

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

◆ CountMethod

Constructor & Destructor Documentation

◆ QgsRandomMarkerFillSymbolLayer()

◆ ~QgsRandomMarkerFillSymbolLayer()

Member Function Documentation

◆ canCauseArtifactsBetweenAdjacentTiles()

◆ clipPoints()

◆ clone()

◆ color()

◆ countMethod()

◆ create()

◆ densityArea()

◆ densityAreaUnit()

◆ densityAreaUnitScale()

◆ hasDataDefinedProperties()

◆ layerType()

◆ mapUnitScale()

◆ outputUnit()

◆ pointCount()

◆ properties()

◆ renderPolygon()

◆ seed()

◆ setClipPoints()

◆ setColor()

◆ setCountMethod()

◆ setDensityArea()

◆ setDensityAreaUnit()

◆ setDensityAreaUnitScale()

◆ setMapUnitScale()

◆ setOutputUnit()

◆ setPointCount()

◆ setSeed()

◆ setSubSymbol()

◆ startFeatureRender()

◆ startRender()

◆ stopFeatureRender()

◆ stopRender()

◆ subSymbol()

◆ usedAttributes()

◆ usesMapUnits()