A marker symbol type, for rendering Point and MultiPoint geometries. More...

#include <qgssymbol.h>

Inheritance diagram for QgsMarkerSymbol:

Public Member Functions
	QgsMarkerSymbol (const QgsSymbolLayerList &layers=QgsSymbolLayerList())
	Constructor for QgsMarkerSymbol, with the specified list of initial symbol layers. More...

double	angle () const
	Returns the marker angle for the whole symbol. More...

QRectF	bounds (QPointF point, QgsRenderContext &context, const QgsFeature &feature=QgsFeature()) const
	Returns the approximate bounding box of the marker symbol, which includes the bounding box of all symbol layers for the symbol. More...

QgsMarkerSymbol *	clone () const override
	Returns a deep copy of this symbol. More...

QgsProperty	dataDefinedAngle () const
	Returns data defined angle for whole symbol (including all symbol layers). More...

QgsProperty	dataDefinedSize () const
	Returns data defined size for whole symbol (including all symbol layers). More...

void	renderPoint (QPointF point, const QgsFeature *f, QgsRenderContext &context, int layer=-1, bool selected=false)
	Renders the symbol at the specified point, using the given render context. More...

ScaleMethod	scaleMethod ()

void	setAngle (double symbolAngle)
	Sets the angle for the whole symbol. More...

void	setDataDefinedAngle (const QgsProperty &property)
	Set data defined angle for whole symbol (including all symbol layers). More...

void	setDataDefinedSize (const QgsProperty &property)
	Set data defined size for whole symbol (including all symbol layers). More...

void	setLineAngle (double lineAngle)
	Sets the line angle modification for the symbol's angle. More...

void	setScaleMethod (QgsSymbol::ScaleMethod scaleMethod)

void	setSize (double size)
	Sets the size for the whole symbol. More...

void	setSizeMapUnitScale (const QgsMapUnitScale &scale)
	Sets the size map unit scale for the whole symbol (including all symbol layers). More...

void	setSizeUnit (QgsUnitTypes::RenderUnit unit)
	Sets the size units for the whole symbol (including all symbol layers). More...

double	size () const
	Returns the estimated size for the whole symbol, which is the maximum size of all marker symbol layers in the symbol. More...

double	size (const QgsRenderContext &context) const
	Returns the symbol size, in painter units. More...

QgsMapUnitScale	sizeMapUnitScale () const
	Returns the size map unit scale for the whole symbol. More...

QgsUnitTypes::RenderUnit	sizeUnit () const
	Returns the size units for the whole symbol (including all symbol layers). More...

Public Member Functions inherited from QgsSymbol
virtual	~QgsSymbol ()

bool	appendSymbolLayer (QgsSymbolLayer *layer)
	Appends a symbol layer at the end of the current symbol layer list. More...

QImage	asImage (QSize size, QgsRenderContext *customContext=nullptr)
	Returns an image of the symbol at the specified size. More...

QImage	bigSymbolPreviewImage (QgsExpressionContext *expressionContext=nullptr, QgsSymbol::PreviewFlags flags=QgsSymbol::FlagIncludeCrosshairsForMarkerSymbols)
	Returns a large (roughly 100x100 pixel) preview image for the symbol. More...

bool	canCauseArtifactsBetweenAdjacentTiles () const
	Returns `true` if the symbol 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	changeSymbolLayer (int index, QgsSymbolLayer *layer)
	Deletes the current layer at the specified index and replaces it with layer. More...

bool	clipFeaturesToExtent () const
	Returns whether features drawn by the symbol will be clipped to the render context's extent. More...

QColor	color () const
	Returns the symbol's color. More...

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

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

bool	deleteSymbolLayer (int index)
	Removes and deletes the symbol layer at the specified index. More...

void	drawPreviewIcon (QPainter painter, QSize size, QgsRenderContext customContext=nullptr, bool selected=false, const QgsExpressionContext expressionContext=nullptr, const QgsLegendPatchShape patchShape=nullptr)
	Draws an icon of the symbol that occupies an area given by size using the specified painter. More...

QString	dump () const
	Returns a string dump of the symbol's properties. More...

void	exportImage (const QString &path, const QString &format, QSize size)
	Export the symbol as an image format, to the specified path and with the given size. More...

bool	forceRHR () const
	Returns `true` if polygon features drawn by the symbol will be reoriented to follow the standard right-hand-rule orientation, in which the area that is bounded by the polygon is to the right of the boundary. More...

bool	hasDataDefinedProperties () const
	Returns whether the symbol utilizes any data defined properties. More...

bool	insertSymbolLayer (int index, QgsSymbolLayer *layer)
	Inserts a symbol layer to specified index. More...

Q_DECL_DEPRECATED const QgsVectorLayer *	layer () const

QgsMapUnitScale	mapUnitScale () const
	Returns the map unit scale for the symbol. More...

qreal	opacity () const
	Returns the opacity for the symbol. More...

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

void	renderFeature (const QgsFeature &feature, QgsRenderContext &context, int layer=-1, bool selected=false, bool drawVertexMarker=false, int currentVertexMarkerType=0, double currentVertexMarkerSize=0.0) SIP_THROW(QgsCsException)
	Render a feature. More...

RenderHints	renderHints () const
	Returns the rendering hint flags for the symbol. More...

void	setClipFeaturesToExtent (bool clipFeaturesToExtent)
	Sets whether features drawn by the symbol should be clipped to the render context's extent. More...

void	setColor (const QColor &color)
	Sets the color for the symbol. More...

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

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

void	setForceRHR (bool force)
	Sets whether polygon features drawn by the symbol should be reoriented to follow the standard right-hand-rule orientation, in which the area that is bounded by the polygon is to the right of the boundary. More...

Q_DECL_DEPRECATED void	setLayer (const QgsVectorLayer *layer)

void	setMapUnitScale (const QgsMapUnitScale &scale)
	Sets the map unit scale for the symbol. More...

void	setOpacity (qreal opacity)
	Sets the opacity for the symbol. More...

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

void	setRenderHints (RenderHints hints)
	Sets rendering hint flags for the symbol. More...

void	startRender (QgsRenderContext &context, const QgsFields &fields=QgsFields())
	Begins the rendering process for the symbol. More...

void	stopRender (QgsRenderContext &context)
	Ends the rendering process. More...

QgsSymbolLayer *	symbolLayer (int layer)
	Returns the symbol layer at the specified index. More...

const QgsSymbolLayer *	symbolLayer (int layer) const
	Returns the symbol layer at the specified index, const variant. More...

int	symbolLayerCount () const
	Returns the total number of symbol layers contained in the symbol. More...

QgsSymbolLayerList	symbolLayers ()
	Returns the list of symbol layers contained in the symbol. More...

QgsSymbolRenderContext *	symbolRenderContext ()
	Returns the symbol render context. More...

QgsSymbolLayer *	takeSymbolLayer (int index)
	Removes a symbol layer from the list and returns a pointer to it. More...

void	toSld (QDomDocument &doc, QDomElement &element, QVariantMap props) const
	Converts the symbol to a SLD representation. More...

SymbolType	type () const
	Returns the symbol's type. More...

QSet< QString >	usedAttributes (const QgsRenderContext &context) const
	Returns a list of attributes required to render this feature. More...

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

Static Public Member Functions
static QgsMarkerSymbol *	createSimple (const QVariantMap &properties)
	Create a marker symbol with one symbol layer: SimpleMarker with specified properties. More...

Static Public Member Functions inherited from QgsSymbol
static QgsSymbol *	defaultSymbol (QgsWkbTypes::GeometryType geomType)
	Returns a new default symbol for the specified geometry type. More...

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

Additional Inherited Members
Public Types inherited from QgsSymbol
enum	PreviewFlag { FlagIncludeCrosshairsForMarkerSymbols = 1 << 0 }
	Flags for controlling how symbol preview images are generated. More...

enum	Property { PropertyOpacity }
	Data definable properties. More...

enum	RenderHint { DynamicRotation = 2 }
	Flags controlling behavior of symbols during rendering. More...

enum	ScaleMethod { ScaleArea , ScaleDiameter }
	Scale method. More...

enum	SymbolType { Marker , Line , Fill , Hybrid }
	Type of the symbol. More...

Protected Member Functions inherited from QgsSymbol
	QgsSymbol (SymbolType type, const QgsSymbolLayerList &layers)

QgsSymbolLayerList	cloneLayers () const
	Retrieve a cloned list of all layers that make up this symbol. More...

void	renderUsingLayer (QgsSymbolLayer *layer, QgsSymbolRenderContext &context)
	Renders a context using a particular symbol layer without passing in a geometry. More...

void	renderVertexMarker (QPointF pt, QgsRenderContext &context, int currentVertexMarkerType, double currentVertexMarkerSize)
	Render editing vertex marker at specified point. More...

Static Protected Member Functions inherited from QgsSymbol
static QPolygonF	_getLineString (QgsRenderContext &context, const QgsCurve &curve, bool clipToExtent=true)
	Creates a line string in screen coordinates from a QgsCurve in map coordinates. More...

static QPointF	_getPoint (QgsRenderContext &context, const QgsPoint &point)
	Creates a point in screen coordinates from a QgsPoint in map coordinates. More...

static void	_getPolygon (QPolygonF &pts, QVector< QPolygonF > &holes, QgsRenderContext &context, const QgsPolygon &polygon, bool clipToExtent=true, bool correctRingOrientation=false)
	Creates a polygon in screen coordinates from a QgsPolygonXYin map coordinates. More...

static QPolygonF	_getPolygonRing (QgsRenderContext &context, const QgsCurve &curve, bool clipToExtent, bool isExteriorRing=false, bool correctRingOrientation=false)
	Creates a polygon ring in screen coordinates from a QgsCurve in map coordinates. More...

Protected Attributes inherited from QgsSymbol
bool	mClipFeaturesToExtent = true

bool	mForceRHR = false

Q_DECL_DEPRECATED const QgsVectorLayer *	mLayer = nullptr

QgsSymbolLayerList	mLayers

qreal	mOpacity = 1.0
	Symbol opacity (in the range 0 - 1) More...

RenderHints	mRenderHints

SymbolType	mType

Detailed Description

A marker symbol type, for rendering Point and MultiPoint geometries.

Definition at line 1003 of file qgssymbol.h.

Constructor & Destructor Documentation

◆ QgsMarkerSymbol()

QgsMarkerSymbol::QgsMarkerSymbol ( const QgsSymbolLayerList & layers = QgsSymbolLayerList() )

Constructor for QgsMarkerSymbol, with the specified list of initial symbol layers.

Ownership of the layers are transferred to the symbol.

Definition at line 1591 of file qgssymbol.cpp.

Member Function Documentation

◆ angle()

double QgsMarkerSymbol::angle ( ) const

Returns the marker angle for the whole symbol.

Note that for symbols with multiple symbol layers, this will correspond just to the angle of the first symbol layer.

See also: setAngle()

Since: QGIS 2.16

Definition at line 1611 of file qgssymbol.cpp.

◆ bounds()

QRectF QgsMarkerSymbol::bounds	(	QPointF	point,
		QgsRenderContext &	context,
		const QgsFeature &	feature = `QgsFeature()`
	)		const

Returns the approximate bounding box of the marker symbol, which includes the bounding box of all symbol layers for the symbol.

It is recommended to use this method only between startRender() and stopRender() calls, or data defined rotation and offset will not be correctly calculated.

Parameters

point	location of rendered point in painter units
context	render context
feature	feature being rendered at point (optional). If not specified, the bounds calculation will not include data defined parameters such as offset and rotation

Returns: approximate symbol bounds, in painter units

Since: QGIS 2.14

Definition at line 2016 of file qgssymbol.cpp.

◆ clone()

QgsMarkerSymbol * QgsMarkerSymbol::clone ( ) const

overridevirtual

Returns a deep copy of this symbol.

Ownership is transferred to the caller.

Implements QgsSymbol.

Definition at line 2036 of file qgssymbol.cpp.

◆ createSimple()

QgsMarkerSymbol * QgsMarkerSymbol::createSimple ( const QVariantMap & properties )

static

Create a marker symbol with one symbol layer: SimpleMarker with specified properties.

This is a convenience method for easier creation of marker symbols.

Definition at line 1556 of file qgssymbol.cpp.

◆ dataDefinedAngle()

QgsProperty QgsMarkerSymbol::dataDefinedAngle ( ) const

Returns data defined angle for whole symbol (including all symbol layers).

Returns: data defined angle, or invalid property if angle is not set at the marker level.

See also: setDataDefinedAngle()

Since: QGIS 3.0

Definition at line 1664 of file qgssymbol.cpp.

◆ dataDefinedSize()

QgsProperty QgsMarkerSymbol::dataDefinedSize ( ) const

Returns data defined size for whole symbol (including all symbol layers).

Returns: data defined size, or invalid property if size is not set at the marker level.

See also: setDataDefinedSize

Since: QGIS 3.0

Definition at line 1869 of file qgssymbol.cpp.

◆ renderPoint()

void QgsMarkerSymbol::renderPoint	(	QPointF	point,
		const QgsFeature *	f,
		QgsRenderContext &	context,
		int	layer = `-1`,
		bool	selected = `false`
	)

Renders the symbol at the specified point, using the given render context.

The f argument is used to pass the feature currently being rendered (when available).

If only a single symbol layer from the symbol should be rendered, it should be specified in the layer argument. A layer of -1 indicates that all symbol layers should be rendered.

If selected is true then the symbol will be drawn using the "selected feature" style and colors instead of the symbol's normal style.

Definition at line 1973 of file qgssymbol.cpp.

◆ scaleMethod()

QgsSymbol::ScaleMethod QgsMarkerSymbol::scaleMethod ( )

Definition at line 1937 of file qgssymbol.cpp.

◆ setAngle()

void QgsMarkerSymbol::setAngle ( double symbolAngle )

Sets the angle for the whole symbol.

Individual symbol layer sizes will be rotated to maintain their current relative angle to the whole symbol angle.

Parameters

symbolAngle new symbol angle

See also: angle()

Definition at line 1598 of file qgssymbol.cpp.

◆ setDataDefinedAngle()

void QgsMarkerSymbol::setDataDefinedAngle ( const QgsProperty & property )

Set data defined angle for whole symbol (including all symbol layers).

See also: dataDefinedAngle()

Since: QGIS 3.0

Definition at line 1635 of file qgssymbol.cpp.

◆ setDataDefinedSize()

void QgsMarkerSymbol::setDataDefinedSize ( const QgsProperty & property )

Set data defined size for whole symbol (including all symbol layers).

See also: dataDefinedSize()

Since: QGIS 3.0

Definition at line 1832 of file qgssymbol.cpp.

◆ setLineAngle()

void QgsMarkerSymbol::setLineAngle ( double lineAngle )

Sets the line angle modification for the symbol's angle.

This angle is added to the marker's rotation and data defined rotation before rendering the symbol, and is usually used for orienting symbols to match a line's angle.

Parameters

lineAngle Angle in degrees, valid values are between 0 and 360

Since: QGIS 2.9

Definition at line 1623 of file qgssymbol.cpp.

◆ setScaleMethod()

void QgsMarkerSymbol::setScaleMethod ( QgsSymbol::ScaleMethod scaleMethod )

Definition at line 1925 of file qgssymbol.cpp.

◆ setSize()

void QgsMarkerSymbol::setSize ( double size )

Sets the size for the whole symbol.

Individual symbol layer sizes will be scaled to maintain their current relative size to the whole symbol size.

Parameters

size	new symbol size

See also: size(); setSizeUnit(); setSizeMapUnitScale()

Definition at line 1711 of file qgssymbol.cpp.

◆ setSizeMapUnitScale()

void QgsMarkerSymbol::setSizeMapUnitScale ( const QgsMapUnitScale & scale )

Sets the size map unit scale for the whole symbol (including all symbol layers).

Parameters

scale map unit scale

See also: sizeMapUnitScale(); setSizeUnit(); setSize()

Since: QGIS 2.16

Definition at line 1805 of file qgssymbol.cpp.

◆ setSizeUnit()

void QgsMarkerSymbol::setSizeUnit ( QgsUnitTypes::RenderUnit unit )

Sets the size units for the whole symbol (including all symbol layers).

Parameters

unit	size units

See also: sizeUnit(); setSizeMapUnitScale(); setSize()

Since: QGIS 2.16

Definition at line 1767 of file qgssymbol.cpp.

◆ size() [1/2]

double QgsMarkerSymbol::size ( ) const

Returns the estimated size for the whole symbol, which is the maximum size of all marker symbol layers in the symbol.

Warning: This returned value is inaccurate if the symbol consists of multiple symbol layers with different size units. Use the overload accepting a QgsRenderContext argument instead for accurate sizes in this case.

See also: setSize(); sizeUnit(); sizeMapUnitScale()

Definition at line 1735 of file qgssymbol.cpp.

◆ size() [2/2]

double QgsMarkerSymbol::size ( const QgsRenderContext & context ) const

Returns the symbol size, in painter units.

This is the maximum size of all marker symbol layers in the symbol.

This method returns an accurate size by calculating the actual rendered size of each symbol layer using the provided render context.

See also: setSize(); sizeUnit(); sizeMapUnitScale()

Since: QGIS 3.4.5

Definition at line 1752 of file qgssymbol.cpp.

◆ sizeMapUnitScale()

QgsMapUnitScale QgsMarkerSymbol::sizeMapUnitScale ( ) const

Returns the size map unit scale for the whole symbol.

Note that for symbols with multiple symbol layers, this will correspond just to the map unit scale for the first symbol layer.

See also: setSizeMapUnitScale(); sizeUnit(); size()

Since: QGIS 2.16

Definition at line 1818 of file qgssymbol.cpp.

◆ sizeUnit()

QgsUnitTypes::RenderUnit QgsMarkerSymbol::sizeUnit ( ) const

Returns the size units for the whole symbol (including all symbol layers).

Returns: size units, or mixed units if symbol layers have different units

See also: setSizeUnit(); sizeMapUnitScale(); size()

Since: QGIS 2.16

Definition at line 1780 of file qgssymbol.cpp.

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

/build/qgis-3.18.1+99unstable/src/core/symbology/qgssymbol.h
/build/qgis-3.18.1+99unstable/src/core/symbology/qgssymbol.cpp

Public Member Functions

Static Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ QgsMarkerSymbol()

Member Function Documentation

◆ angle()

◆ bounds()

◆ clone()

◆ createSimple()

◆ dataDefinedAngle()

◆ dataDefinedSize()

◆ renderPoint()

◆ scaleMethod()

◆ setAngle()

◆ setDataDefinedAngle()

◆ setDataDefinedSize()

◆ setLineAngle()

◆ setScaleMethod()

◆ setSize()

◆ setSizeMapUnitScale()

◆ setSizeUnit()

◆ size() [1/2]

◆ size() [2/2]

◆ sizeMapUnitScale()

◆ sizeUnit()