QgsMarkerSymbol Class Reference

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

#include <qgsmarkersymbol.h>

Inheritance diagram for QgsMarkerSymbol:

Public Member Functions
	QgsMarkerSymbol (const QgsSymbolLayerList &layers=QgsSymbolLayerList())
	Constructor for QgsMarkerSymbol, with the specified list of initial symbol layers.
double	angle () const
	Returns the marker angle for the whole symbol.
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.
QgsMarkerSymbol *	clone () const override
	Returns a deep copy of this symbol.
QgsProperty	dataDefinedAngle () const
	Returns data defined angle for whole symbol (including all symbol layers).
QgsProperty	dataDefinedSize () const
	Returns data defined size for whole symbol (including all symbol layers).
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.
Qgis::ScaleMethod	scaleMethod () const
	Returns the method to use for scaling the marker's size.
void	setAngle (double symbolAngle) const
	Sets the angle for the whole symbol.
void	setDataDefinedAngle (const QgsProperty &property)
	Set data defined angle for whole symbol (including all symbol layers).
void	setDataDefinedSize (const QgsProperty &property) const
	Set data defined size for whole symbol (including all symbol layers).
void	setLineAngle (double lineAngle) const
	Sets the line angle modification for the symbol's angle.
void	setScaleMethod (Qgis::ScaleMethod scaleMethod) const
	Sets the method to use for scaling the marker's size.
void	setSize (double size) const
	Sets the size for the whole symbol.
void	setSizeMapUnitScale (const QgsMapUnitScale &scale) const
	Sets the size map unit scale for the whole symbol (including all symbol layers).
void	setSizeUnit (Qgis::RenderUnit unit) const
	Sets the size units for the whole symbol (including all symbol layers).
double	size () const
	Returns the estimated size for the whole symbol, which is the maximum size of all marker symbol layers in the symbol.
double	size (const QgsRenderContext &context) const
	Returns the symbol size, in painter units.
QgsMapUnitScale	sizeMapUnitScale () const
	Returns the size map unit scale for the whole symbol.
Qgis::RenderUnit	sizeUnit () const
	Returns the size units for the whole symbol (including all symbol layers).
Public Member Functions inherited from QgsSymbol
virtual	~QgsSymbol ()
QgsSymbolAnimationSettings &	animationSettings ()
	Returns a reference to the symbol animation settings.
const QgsSymbolAnimationSettings &	animationSettings () const
	Returns a reference to the symbol animation settings.
bool	appendSymbolLayer (QgsSymbolLayer *layer)
	Appends a symbol layer at the end of the current symbol layer list.
QImage	asImage (QSize size, QgsRenderContext *customContext=nullptr)
	Returns an image of the symbol at the specified size.
Q_DECL_DEPRECATED QImage	bigSymbolPreviewImage (QgsExpressionContext *expressionContext=nullptr, int flags=static_cast< int >(Qgis::SymbolPreviewFlag::FlagIncludeCrosshairsForMarkerSymbols))
QImage	bigSymbolPreviewImage (QgsExpressionContext *expressionContext=nullptr, Qgis::SymbolPreviewFlags flags=Qgis::SymbolPreviewFlag::FlagIncludeCrosshairsForMarkerSymbols, const QgsScreenProperties &screen=QgsScreenProperties())
	Returns a large (roughly 100x100 pixel) preview image for the symbol.
QgsSymbolBufferSettings *	bufferSettings ()
	Returns the symbol buffer settings, which control an optional "halo" effect around the symbol.
const QgsSymbolBufferSettings *	bufferSettings () const
	Returns the symbol buffer settings, which control an optional "halo" effect around the symbol.
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.
bool	changeSymbolLayer (int index, QgsSymbolLayer *layer)
	Deletes the current layer at the specified index and replaces it with layer.
bool	clipFeaturesToExtent () const
	Returns whether features drawn by the symbol will be clipped to the render context's extent.
QColor	color () const
	Returns the symbol's color.
QgsPropertyCollection &	dataDefinedProperties ()
	Returns a reference to the symbol's property collection, used for data defined overrides.
const QgsPropertyCollection &	dataDefinedProperties () const
	Returns a reference to the symbol's property collection, used for data defined overrides.
bool	deleteSymbolLayer (int index)
	Removes and deletes the symbol layer at the specified index.
void	drawPreviewIcon (QPainter *painter, QSize size, QgsRenderContext *customContext=nullptr, bool selected=false, const QgsExpressionContext *expressionContext=nullptr, const QgsLegendPatchShape *patchShape=nullptr, const QgsScreenProperties &screen=QgsScreenProperties())
	Draws an icon of the symbol that occupies an area given by size using the specified painter.
QString	dump () const
	Returns a string dump of the symbol's properties.
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.
Qgis::SymbolFlags	flags () const
	Returns flags for the symbol.
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.
bool	hasDataDefinedProperties () const
	Returns whether the symbol utilizes any data defined properties.
bool	insertSymbolLayer (int index, QgsSymbolLayer *layer)
	Inserts a symbol layer to specified index.
Q_DECL_DEPRECATED const QgsVectorLayer *	layer () const
QgsMapUnitScale	mapUnitScale () const
	Returns the map unit scale for the symbol.
qreal	opacity () const
	Returns the opacity for the symbol.
Qgis::RenderUnit	outputUnit () const
	Returns the units to use for sizes and widths within the symbol.
void	renderFeature (const QgsFeature &feature, QgsRenderContext &context, int layer=-1, bool selected=false, bool drawVertexMarker=false, Qgis::VertexMarkerType currentVertexMarkerType=Qgis::VertexMarkerType::SemiTransparentCircle, double currentVertexMarkerSize=0.0)
	Render a feature.
Qgis::SymbolRenderHints	renderHints () const
	Returns the rendering hint flags for the symbol.
void	setAnimationSettings (const QgsSymbolAnimationSettings &settings)
	Sets a the symbol animation settings.
void	setBufferSettings (QgsSymbolBufferSettings *settings)
	Sets a the symbol buffer settings, which control an optional "halo" effect around the symbol.
void	setClipFeaturesToExtent (bool clipFeaturesToExtent)
	Sets whether features drawn by the symbol should be clipped to the render context's extent.
void	setColor (const QColor &color) const
	Sets the color for the symbol.
void	setDataDefinedProperties (const QgsPropertyCollection &collection)
	Sets the symbol's property collection, used for data defined overrides.
void	setDataDefinedProperty (Property key, const QgsProperty &property)
	Sets a data defined property for the symbol.
void	setFlags (Qgis::SymbolFlags flags)
	Sets flags for the symbol.
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.
Q_DECL_DEPRECATED void	setLayer (const QgsVectorLayer *layer)
void	setMapUnitScale (const QgsMapUnitScale &scale) const
	Sets the map unit scale for the symbol.
void	setOpacity (qreal opacity)
	Sets the opacity for the symbol.
void	setOutputUnit (Qgis::RenderUnit unit) const
	Sets the units to use for sizes and widths within the symbol.
void	setRenderHints (Qgis::SymbolRenderHints hints)
	Sets rendering hint flags for the symbol.
void	startFeatureRender (const QgsFeature &feature, QgsRenderContext &context, int layer=-1)
	Called before symbol layers will be rendered for a particular feature.
void	startRender (QgsRenderContext &context, const QgsFields &fields=QgsFields())
	Begins the rendering process for the symbol.
void	stopFeatureRender (const QgsFeature &feature, QgsRenderContext &context, int layer=-1)
	Called after symbol layers have been rendered for a particular feature.
void	stopRender (QgsRenderContext &context)
	Ends the rendering process.
QgsSymbolLayer *	symbolLayer (int layer)
	Returns the symbol layer at the specified index.
const QgsSymbolLayer *	symbolLayer (int layer) const
	Returns the symbol layer at the specified index, const variant.
int	symbolLayerCount () const
	Returns the total number of symbol layers contained in the symbol.
QgsSymbolLayerList	symbolLayers () const
	Returns the list of symbol layers contained in the symbol.
QgsSymbolRenderContext *	symbolRenderContext ()
	Returns the symbol render context.
QgsSymbolLayer *	takeSymbolLayer (int index)
	Removes a symbol layer from the list and returns a pointer to it.
void	toSld (QDomDocument &doc, QDomElement &element, QVariantMap props) const
	Converts the symbol to a SLD representation.
Qgis::SymbolType	type () const
	Returns the symbol's type.
QSet< QString >	usedAttributes (const QgsRenderContext &context) const
	Returns a list of attributes required to render this feature.
bool	usesMapUnits () const
	Returns true if the symbol has any components which use map unit based sizes.

Static Public Member Functions
static QgsMarkerSymbol *	createSimple (const QVariantMap &properties)
	Create a marker symbol with one symbol layer: SimpleMarker with specified properties.
Static Public Member Functions inherited from QgsSymbol
static QgsSymbol *	defaultSymbol (Qgis::GeometryType geomType)
	Returns a new default symbol for the specified geometry type.
static const QgsPropertiesDefinition &	propertyDefinitions ()
	Returns the symbol property definitions.
static Qgis::SymbolType	symbolTypeForGeometryType (Qgis::GeometryType type)
	Returns the default symbol type required for the specified geometry type.
static QString	symbolTypeToString (Qgis::SymbolType type)
	Returns a translated string version of the specified symbol type.

Additional Inherited Members
Public Types inherited from QgsSymbol
enum class	Property : int { Opacity }
	Data definable properties. More...
Protected Member Functions inherited from QgsSymbol
	QgsSymbol (Qgis::SymbolType type, const QgsSymbolLayerList &layers)
	Constructor for a QgsSymbol of the specified type.
QgsSymbolLayerList	cloneLayers () const
	Retrieve a cloned list of all layers that make up this symbol.
void	copyCommonProperties (const QgsSymbol *other)
	Copies common properties from an other symbol to this symbol.
void	renderUsingLayer (QgsSymbolLayer *layer, QgsSymbolRenderContext &context, Qgis::GeometryType geometryType=Qgis::GeometryType::Unknown, const QPolygonF *points=nullptr, const QVector< QPolygonF > *rings=nullptr)
	Renders a context using a particular symbol layer without passing in a geometry.
void	renderVertexMarker (QPointF pt, QgsRenderContext &context, Qgis::VertexMarkerType currentVertexMarkerType, double currentVertexMarkerSize)
	Render editing vertex marker at specified point.
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.
static QPointF	_getPoint (QgsRenderContext &context, const QgsPoint &point)
	Creates a point in screen coordinates from a QgsPoint in map coordinates.
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.
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.
Protected Attributes inherited from QgsSymbol
QgsSymbolAnimationSettings	mAnimationSettings
std::unique_ptr< QgsSymbolBufferSettings >	mBufferSettings
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)
Qgis::SymbolRenderHints	mRenderHints
Qgis::SymbolFlags	mSymbolFlags = Qgis::SymbolFlags()
	Symbol flags.
Qgis::SymbolType	mType

Detailed Description

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

Definition at line 30 of file qgsmarkersymbol.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 36 of file qgsmarkersymbol.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()

Definition at line 56 of file qgsmarkersymbol.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

Definition at line 586 of file qgsmarkersymbol.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 610 of file qgsmarkersymbol.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 25 of file qgsmarkersymbol.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()

Definition at line 109 of file qgsmarkersymbol.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

Definition at line 346 of file qgsmarkersymbol.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 450 of file qgsmarkersymbol.cpp.

scaleMethod()

Qgis::ScaleMethod QgsMarkerSymbol::scaleMethod

(

)

const

Returns the method to use for scaling the marker's size.

See also

setScaleMethod()

Definition at line 414 of file qgsmarkersymbol.cpp.

setAngle()

void QgsMarkerSymbol::setAngle

(

double

symbolAngle

)

const

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 43 of file qgsmarkersymbol.cpp.

setDataDefinedAngle()

void QgsMarkerSymbol::setDataDefinedAngle

(

const QgsProperty &

property

)

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

See also

dataDefinedAngle()

Definition at line 80 of file qgsmarkersymbol.cpp.

setDataDefinedSize()

void QgsMarkerSymbol::setDataDefinedSize

(

const QgsProperty &

property

)

const

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

See also

dataDefinedSize()

Definition at line 309 of file qgsmarkersymbol.cpp.

setLineAngle()

void QgsMarkerSymbol::setLineAngle

(

double

lineAngle

)

const

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

Definition at line 68 of file qgsmarkersymbol.cpp.

setScaleMethod()

void QgsMarkerSymbol::setScaleMethod

(

Qgis::ScaleMethod

scaleMethod

)

const

Sets the method to use for scaling the marker's size.

Parameters

scaleMethod

scale method

See also

scaleMethod()

Definition at line 402 of file qgsmarkersymbol.cpp.

setSize()

void QgsMarkerSymbol::setSize

(

double

size

)

const

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 156 of file qgsmarkersymbol.cpp.

setSizeMapUnitScale()

void QgsMarkerSymbol::setSizeMapUnitScale

(

const QgsMapUnitScale &

scale

)

const

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

Parameters

scale

map unit scale

See also

sizeMapUnitScale()

setSizeUnit()

setSize()

Definition at line 282 of file qgsmarkersymbol.cpp.

setSizeUnit()

void QgsMarkerSymbol::setSizeUnit

(

Qgis::RenderUnit

unit

)

const

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

Parameters

unit	size units

See also

sizeUnit()

setSizeMapUnitScale()

setSize()

Definition at line 244 of file qgsmarkersymbol.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 200 of file qgsmarkersymbol.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 229 of file qgsmarkersymbol.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()

Definition at line 295 of file qgsmarkersymbol.cpp.

sizeUnit()

Qgis::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()

Definition at line 257 of file qgsmarkersymbol.cpp.

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

• /build/qgis-3.41.0+git20241110+fda2aa46e9a+99sid/src/core/symbology/qgsmarkersymbol.h
• /build/qgis-3.41.0+git20241110+fda2aa46e9a+99sid/src/core/symbology/qgsmarkersymbol.cpp