#include <qgsrenderer.h>

Inheritance diagram for QgsFeatureRenderer:

[legend]

Public Types
enum	Capability { SymbolLevels = 1, MoreSymbolsPerFeature = 1 << 2, Filter = 1 << 3, ScaleDependent = 1 << 4 }
	Used to specify details about a renderer. More...

Public Member Functions
virtual	~QgsFeatureRenderer ()

virtual QgsFeatureRenderer::Capabilities	capabilities ()
	Returns details about internals of this renderer. More...

virtual void	checkLegendSymbolItem (const QString &key, bool state=true)
	item in symbology was checked More...

virtual QgsFeatureRenderer *	clone () const =0
	Create a deep copy of this renderer. More...

virtual QString	dump () const
	Returns debug information about this renderer. More...

virtual const QgsFeatureRenderer *	embeddedRenderer () const
	Returns the current embedded renderer (subrenderer) for this feature renderer. More...

virtual QString	filter (const QgsFields &fields=QgsFields())
	If a renderer does not require all the features this method may be overridden and return an expression used as where clause. More...

virtual bool	filterNeedsGeometry () const
	Returns true if this renderer requires the geometry to apply the filter. More...

bool	forceRasterRender () const
	Returns whether the renderer must render as a raster. More...

virtual QString	legendClassificationAttribute () const
	If supported by the renderer, return classification attribute for the use in legend. More...

virtual QSet< QString >	legendKeysForFeature (const QgsFeature &feature, QgsRenderContext &context) const
	Returns legend keys matching a specified feature. More...

virtual bool	legendSymbolItemChecked (const QString &key)
	items of symbology items in legend is checked More...

virtual QgsLegendSymbolList	legendSymbolItems () const
	Returns a list of symbology items for the legend. More...

virtual bool	legendSymbolItemsCheckable () const
	items of symbology items in legend should be checkable More...

virtual void	modifyRequestExtent (QgsRectangle &extent, QgsRenderContext &context)
	Allows for a renderer to modify the extent of a feature request prior to rendering. More...

QgsFeatureRequest::OrderBy	orderBy () const
	Gets the order in which features shall be processed by this renderer. More...

bool	orderByEnabled () const
	Returns whether custom ordering will be applied before features are processed by this renderer. More...

virtual QgsSymbol *	originalSymbolForFeature (const QgsFeature &feature, QgsRenderContext &context) const
	Returns symbol for feature. More...

virtual QgsSymbolList	originalSymbolsForFeature (const QgsFeature &feature, QgsRenderContext &context) const
	Equivalent of originalSymbolsForFeature() call extended to support renderers that may use more symbols per feature - similar to symbolsForFeature() More...

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

virtual bool	renderFeature (const QgsFeature &feature, QgsRenderContext &context, int layer=-1, bool selected=false, bool drawVertexMarker=false) SIP_THROW(QgsCsException)
	Render a feature using this renderer in the given context. More...

virtual QDomElement	save (QDomDocument &doc, const QgsReadWriteContext &context)
	store renderer info to XML element More...

virtual void	setEmbeddedRenderer (QgsFeatureRenderer *subRenderer)
	Sets an embedded renderer (subrenderer) for this feature renderer. More...

void	setForceRasterRender (bool forceRaster)
	Sets whether the renderer should be rendered to a raster destination. More...

virtual void	setLegendSymbolItem (const QString &key, QgsSymbol *symbol)
	Sets the symbol to be used for a legend symbol item. More...

void	setOrderBy (const QgsFeatureRequest::OrderBy &orderBy)
	Define the order in which features shall be processed by this renderer. More...

void	setOrderByEnabled (bool enabled)
	Sets whether custom ordering should be applied before features are processed by this renderer. More...

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

void	setUsingSymbolLevels (bool usingSymbolLevels)

void	setVertexMarkerAppearance (int type, double size)
	Sets type and size of editing vertex markers for subsequent rendering. More...

virtual void	startRender (QgsRenderContext &context, const QgsFields &fields)
	Must be called when a new render cycle is started. More...

virtual void	stopRender (QgsRenderContext &context)
	Must be called when a render cycle has finished, to allow the renderer to clean up. More...

virtual QgsSymbol *	symbolForFeature (const QgsFeature &feature, QgsRenderContext &context) const =0
	To be overridden. More...

virtual QgsSymbolList	symbols (QgsRenderContext &context) const
	Returns list of symbols used by the renderer. More...

virtual QgsSymbolList	symbolsForFeature (const QgsFeature &feature, QgsRenderContext &context) const
	Returns list of symbols used for rendering the feature. More...

virtual void	toSld (QDomDocument &doc, QDomElement &element, const QgsStringMap &props=QgsStringMap()) const
	used from subclasses to create SLD Rule elements following SLD v1.1 specs More...

QString	type () const

virtual QSet< QString >	usedAttributes (const QgsRenderContext &context) const =0
	Returns a list of attributes required by this renderer. More...

bool	usingSymbolLevels () const

virtual bool	willRenderFeature (const QgsFeature &feature, QgsRenderContext &context) const
	Returns whether the renderer will render a feature or not. More...

virtual QDomElement	writeSld (QDomDocument &doc, const QString &styleName, const QgsStringMap &props=QgsStringMap()) const
	create the SLD UserStyle element following the SLD v1.1 specs with the given name More...

Static Public Member Functions
static QgsFeatureRenderer *	defaultRenderer (QgsWkbTypes::GeometryType geomType)
	Returns a new renderer - used by default in vector layers. More...

static QgsFeatureRenderer *	load (QDomElement &symbologyElem, const QgsReadWriteContext &context)
	create a renderer from XML element More...

static QgsFeatureRenderer *	loadSld (const QDomNode &node, QgsWkbTypes::GeometryType geomType, QString &errorMessage)
	Create a new renderer according to the information contained in the UserStyle element of a SLD style document. More...

Protected Member Functions
	QgsFeatureRenderer (const QString &type)

void	copyRendererData (QgsFeatureRenderer *destRenderer) const
	Clones generic renderer data to another renderer. More...

void	renderFeatureWithSymbol (const QgsFeature &feature, QgsSymbol *symbol, QgsRenderContext &context, int layer, bool selected, bool drawVertexMarker) SIP_THROW(QgsCsException)
	Render the feature with the symbol using context. More...

void	renderVertexMarker (QPointF pt, QgsRenderContext &context)
	render editing vertex marker at specified point More...

void	renderVertexMarkerPolygon (QPolygonF &pts, QList< QPolygonF > *rings, QgsRenderContext &context)
	render editing vertex marker for a polygon More...

void	renderVertexMarkerPolyline (QPolygonF &pts, QgsRenderContext &context)
	render editing vertex marker for a polyline More...

Static Protected Member Functions
static QPointF	_getPoint (QgsRenderContext &context, const QgsPoint &point)
	Creates a point in screen coordinates from a wkb string in map coordinates. More...

static void	convertSymbolRotation (QgsSymbol *symbol, const QString &field)

static void	convertSymbolSizeScale (QgsSymbol *symbol, QgsSymbol::ScaleMethod method, const QString &field)

Protected Attributes
double	mCurrentVertexMarkerSize
	The current size of editing marker. More...

int	mCurrentVertexMarkerType
	The current type of editing marker. More...

bool	mForceRaster

QgsFeatureRequest::OrderBy	mOrderBy

bool	mOrderByEnabled

QgsPaintEffect *	mPaintEffect = nullptr

QString	mType

bool	mUsingSymbolLevels

Detailed Description

Definition at line 90 of file qgsrenderer.h.

Member Enumeration Documentation

enum QgsFeatureRenderer::Capability

Used to specify details about a renderer.

Is returned from the capabilities() method.

Enumerator
SymbolLevels	Rendering with symbol levels (i.e. implements symbols(), symbolForFeature())
MoreSymbolsPerFeature	May use more than one symbol to render a feature: symbolsForFeature() will return them.
Filter	Features may be filtered, i.e. some features may not be rendered (categorized, rule based ...)
ScaleDependent	Depends on scale if feature will be rendered (rule based )

Definition at line 240 of file qgsrenderer.h.

Constructor & Destructor Documentation

QgsFeatureRenderer::~QgsFeatureRenderer ( )

virtual

Definition at line 70 of file qgsrenderer.cpp.

QgsFeatureRenderer::QgsFeatureRenderer ( const QString & type )

protected

Definition at line 58 of file qgsrenderer.cpp.

Member Function Documentation

QPointF QgsFeatureRenderer::_getPoint	(	QgsRenderContext &	context,
		const QgsPoint &	point
	)

staticprotected

Creates a point in screen coordinates from a wkb string in map coordinates.

Definition at line 43 of file qgsrenderer.cpp.

virtual QgsFeatureRenderer::Capabilities QgsFeatureRenderer::capabilities ( )

inlinevirtual

Returns details about internals of this renderer.

E.g. if you only want to deal with visible features:

 if not renderer.capabilities().testFlag(QgsFeatureRenderer.Filter) or renderer.willRenderFeature(feature, context):
     deal_with_my_feature()
 else:
     skip_the_curren_feature()

Reimplemented in QgsRuleBasedRenderer, QgsCategorizedSymbolRenderer, QgsGraduatedSymbolRenderer, QgsPointDistanceRenderer, QgsInvertedPolygonRenderer, and QgsSingleSymbolRenderer.

Definition at line 262 of file qgsrenderer.h.

void QgsFeatureRenderer::checkLegendSymbolItem	(	const QString &	key,
		bool	state = `true`
	)

virtual

item in symbology was checked

Since: QGIS 2.5

Reimplemented in QgsRuleBasedRenderer, QgsGraduatedSymbolRenderer, QgsCategorizedSymbolRenderer, QgsInvertedPolygonRenderer, and QgsPointDistanceRenderer.

Definition at line 322 of file qgsrenderer.cpp.

virtual QgsFeatureRenderer* QgsFeatureRenderer::clone ( ) const

pure virtual

Create a deep copy of this renderer.

Should be implemented by all subclasses and generate a proper subclass.

Returns: A copy of this renderer

Implemented in QgsRuleBasedRenderer, QgsCategorizedSymbolRenderer, QgsGraduatedSymbolRenderer, QgsSingleSymbolRenderer, QgsInvertedPolygonRenderer, QgsPointDisplacementRenderer, Qgs25DRenderer, QgsHeatmapRenderer, QgsNullSymbolRenderer, and QgsPointClusterRenderer.

void QgsFeatureRenderer::convertSymbolRotation	(	QgsSymbol *	symbol,
		const QString &	field
	)

staticprotected

Note: this function is used to convert old rotations expressions to symbol level DataDefined angle

Definition at line 464 of file qgsrenderer.cpp.

void QgsFeatureRenderer::convertSymbolSizeScale	(	QgsSymbol *	symbol,
		QgsSymbol::ScaleMethod	method,
		const QString &	field
	)

staticprotected

Note: this function is used to convert old sizeScale expressions to symbol level DataDefined size

Definition at line 442 of file qgsrenderer.cpp.

void QgsFeatureRenderer::copyRendererData ( QgsFeatureRenderer * destRenderer ) const

protected

Clones generic renderer data to another renderer.

Currently clones

Order By
Paint Effect

Parameters

destRenderer destination renderer for copied effect

Definition at line 48 of file qgsrenderer.cpp.

QgsFeatureRenderer * QgsFeatureRenderer::defaultRenderer ( QgsWkbTypes::GeometryType geomType )

static

Returns a new renderer - used by default in vector layers.

Definition at line 75 of file qgsrenderer.cpp.

QString QgsFeatureRenderer::dump ( ) const

virtual

Returns debug information about this renderer.

Reimplemented in QgsRuleBasedRenderer, QgsCategorizedSymbolRenderer, QgsGraduatedSymbolRenderer, QgsInvertedPolygonRenderer, QgsSingleSymbolRenderer, QgsHeatmapRenderer, and QgsNullSymbolRenderer.

Definition at line 137 of file qgsrenderer.cpp.

const QgsFeatureRenderer * QgsFeatureRenderer::embeddedRenderer ( ) const

virtual

Returns the current embedded renderer (subrenderer) for this feature renderer.

The base class implementation does not use subrenderers and will always return null.

See also: setEmbeddedRenderer()

Since: QGIS 2.16

Reimplemented in QgsInvertedPolygonRenderer, and QgsPointDistanceRenderer.

Definition at line 437 of file qgsrenderer.cpp.

virtual QString QgsFeatureRenderer::filter ( const QgsFields & fields = QgsFields() )

inlinevirtual

If a renderer does not require all the features this method may be overridden and return an expression used as where clause.

This will be called once after startRender() and before the first call to renderFeature(). By default this returns a null string and all features will be requested. You do not need to specify the extent in here, this is taken care of separately and will be combined with a filter returned from this method.

Returns: An expression used as where clause

Reimplemented in QgsRuleBasedRenderer, QgsCategorizedSymbolRenderer, and QgsPointDistanceRenderer.

Definition at line 193 of file qgsrenderer.h.

bool QgsFeatureRenderer::filterNeedsGeometry ( ) const

virtual

Returns true if this renderer requires the geometry to apply the filter.

Reimplemented in QgsRuleBasedRenderer, QgsCategorizedSymbolRenderer, QgsGraduatedSymbolRenderer, QgsPointDistanceRenderer, and QgsInvertedPolygonRenderer.

Definition at line 113 of file qgsrenderer.cpp.

bool QgsFeatureRenderer::forceRasterRender ( ) const

inline

Returns whether the renderer must render as a raster.

See also: setForceRasterRender

Since: QGIS 2.12

Definition at line 400 of file qgsrenderer.h.

virtual QString QgsFeatureRenderer::legendClassificationAttribute ( ) const

inlinevirtual

If supported by the renderer, return classification attribute for the use in legend.

Since: QGIS 2.6

Reimplemented in QgsGraduatedSymbolRenderer, and QgsCategorizedSymbolRenderer.

Definition at line 342 of file qgsrenderer.h.

QSet< QString > QgsFeatureRenderer::legendKeysForFeature	(	const QgsFeature &	feature,
		QgsRenderContext &	context
	)		const

virtual

Returns legend keys matching a specified feature.

Since: QGIS 2.14

Reimplemented in QgsRuleBasedRenderer, QgsGraduatedSymbolRenderer, QgsCategorizedSymbolRenderer, QgsPointDistanceRenderer, and QgsSingleSymbolRenderer.

Definition at line 85 of file qgsrenderer.cpp.

bool QgsFeatureRenderer::legendSymbolItemChecked ( const QString & key )

virtual

items of symbology items in legend is checked

Since: QGIS 2.5

Reimplemented in QgsRuleBasedRenderer, QgsGraduatedSymbolRenderer, QgsCategorizedSymbolRenderer, QgsInvertedPolygonRenderer, and QgsPointDistanceRenderer.

Definition at line 316 of file qgsrenderer.cpp.

QgsLegendSymbolList QgsFeatureRenderer::legendSymbolItems ( ) const

virtual

Returns a list of symbology items for the legend.

Since: QGIS 2.6

Reimplemented in QgsRuleBasedRenderer, QgsGraduatedSymbolRenderer, QgsCategorizedSymbolRenderer, QgsInvertedPolygonRenderer, QgsPointDistanceRenderer, and QgsSingleSymbolRenderer.

Definition at line 334 of file qgsrenderer.cpp.

bool QgsFeatureRenderer::legendSymbolItemsCheckable ( ) const

virtual

items of symbology items in legend should be checkable

Since: QGIS 2.5

Reimplemented in QgsRuleBasedRenderer, QgsGraduatedSymbolRenderer, QgsCategorizedSymbolRenderer, QgsInvertedPolygonRenderer, and QgsPointDistanceRenderer.

Definition at line 311 of file qgsrenderer.cpp.

QgsFeatureRenderer * QgsFeatureRenderer::load	(	QDomElement &	symbologyElem,
		const QgsReadWriteContext &	context
	)

static

create a renderer from XML element

Definition at line 148 of file qgsrenderer.cpp.

QgsFeatureRenderer * QgsFeatureRenderer::loadSld	(	const QDomNode &	node,
		QgsWkbTypes::GeometryType	geomType,
		QString &	errorMessage
	)

static

Create a new renderer according to the information contained in the UserStyle element of a SLD style document.

Parameters

node	the node in the SLD document whose the UserStyle element is a child
geomType	the geometry type of the features, used to convert Symbolizer elements
errorMessage	it will contain the error message if something went wrong

Returns: the renderer

Definition at line 203 of file qgsrenderer.cpp.

void QgsFeatureRenderer::modifyRequestExtent	(	QgsRectangle &	extent,
		QgsRenderContext &	context
	)

virtual

Allows for a renderer to modify the extent of a feature request prior to rendering.

Parameters

extent	reference to request's filter extent. Modify extent to change the extent of feature request
context	render context

Since: QGIS 2.7

Reimplemented in QgsHeatmapRenderer.

Definition at line 387 of file qgsrenderer.cpp.

QgsFeatureRequest::OrderBy QgsFeatureRenderer::orderBy ( ) const

Gets the order in which features shall be processed by this renderer.

Note: this property has no effect if orderByEnabled() is false

See also: orderByEnabled()

Since: QGIS 2.14

Definition at line 412 of file qgsrenderer.cpp.

bool QgsFeatureRenderer::orderByEnabled ( ) const

Returns whether custom ordering will be applied before features are processed by this renderer.

See also: orderBy(); setOrderByEnabled()

Since: QGIS 2.14

Definition at line 422 of file qgsrenderer.cpp.

QgsSymbol * QgsFeatureRenderer::originalSymbolForFeature	(	const QgsFeature &	feature,
		QgsRenderContext &	context
	)		const

virtual

Returns symbol for feature.

The difference compared to symbolForFeature() is that it returns original symbol which can be used as an identifier for renderer's rule - the former may return a temporary replacement of a symbol for use in rendering.

Since: QGIS 2.12

Reimplemented in QgsCategorizedSymbolRenderer, QgsGraduatedSymbolRenderer, QgsInvertedPolygonRenderer, QgsPointDistanceRenderer, QgsSingleSymbolRenderer, and QgsNullSymbolRenderer.

Definition at line 80 of file qgsrenderer.cpp.

QgsSymbolList QgsFeatureRenderer::originalSymbolsForFeature	(	const QgsFeature &	feature,
		QgsRenderContext &	context
	)		const

virtual

Equivalent of originalSymbolsForFeature() call extended to support renderers that may use more symbols per feature - similar to symbolsForFeature()

Since: QGIS 2.12

Reimplemented in QgsRuleBasedRenderer, QgsInvertedPolygonRenderer, and QgsPointDistanceRenderer.

Definition at line 393 of file qgsrenderer.cpp.

QgsPaintEffect * QgsFeatureRenderer::paintEffect ( ) const

Returns the current paint effect for the renderer.

Returns: paint effect

See also: setPaintEffect

Since: QGIS 2.9

Definition at line 401 of file qgsrenderer.cpp.

bool QgsFeatureRenderer::renderFeature	(	const QgsFeature &	feature,
		QgsRenderContext &	context,
		int	layer = `-1`,
		bool	selected = `false`,
		bool	drawVertexMarker = `false`
	)

virtual

Render a feature using this renderer in the given context.

Must be called between startRender() and stopRender() calls. Default implementation renders a symbol as determined by symbolForFeature() call. Returns true if the feature has been returned (this is used for example to determine whether the feature may be labelled).

If layer is not -1, the renderer should draw only a particula layer from symbols (in order to support symbol level rendering).

See also: startRender(); stopRender()

Reimplemented in QgsRuleBasedRenderer, QgsPointDistanceRenderer, QgsInvertedPolygonRenderer, QgsHeatmapRenderer, and QgsNullSymbolRenderer.

Definition at line 118 of file qgsrenderer.cpp.

void QgsFeatureRenderer::renderFeatureWithSymbol	(	const QgsFeature &	feature,
		QgsSymbol *	symbol,
		QgsRenderContext &	context,
		int	layer,
		bool	selected,
		bool	drawVertexMarker
	)

protected

Render the feature with the symbol using context.

Use layer to specify the symbol layer, selected to specify if it should be rendered as selected and drawVertexMarker to specify if vertex markers should be rendered.

Definition at line 132 of file qgsrenderer.cpp.

void QgsFeatureRenderer::renderVertexMarker	(	QPointF	pt,
		QgsRenderContext &	context
	)

protected

render editing vertex marker at specified point

Definition at line 350 of file qgsrenderer.cpp.

void QgsFeatureRenderer::renderVertexMarkerPolygon	(	QPolygonF &	pts,
		QList< QPolygonF > *	rings,
		QgsRenderContext &	context
	)

protected

render editing vertex marker for a polygon

Definition at line 364 of file qgsrenderer.cpp.

void QgsFeatureRenderer::renderVertexMarkerPolyline	(	QPolygonF &	pts,
		QgsRenderContext &	context
	)

protected

render editing vertex marker for a polyline

Definition at line 358 of file qgsrenderer.cpp.

QDomElement QgsFeatureRenderer::save	(	QDomDocument &	doc,
		const QgsReadWriteContext &	context
	)

virtual

store renderer info to XML element

Reimplemented in QgsRuleBasedRenderer, QgsGraduatedSymbolRenderer, QgsCategorizedSymbolRenderer, QgsInvertedPolygonRenderer, QgsSingleSymbolRenderer, QgsHeatmapRenderer, QgsNullSymbolRenderer, QgsPointDisplacementRenderer, Qgs25DRenderer, and QgsPointClusterRenderer.

Definition at line 183 of file qgsrenderer.cpp.

void QgsFeatureRenderer::setEmbeddedRenderer ( QgsFeatureRenderer * subRenderer )

virtual

Sets an embedded renderer (subrenderer) for this feature renderer.

The base class implementation does nothing with subrenderers, but individual derived classes can use these to modify their behavior.

Parameters

subRenderer the embedded renderer. Ownership will be transferred.

See also: embeddedRenderer()

Since: QGIS 2.16

Reimplemented in QgsInvertedPolygonRenderer, and QgsPointDistanceRenderer.

Definition at line 432 of file qgsrenderer.cpp.

void QgsFeatureRenderer::setForceRasterRender ( bool forceRaster )

inline

Sets whether the renderer should be rendered to a raster destination.

Parameters

forceRaster set to true if renderer must be drawn on a raster surface. This may be desirable for highly detailed layers where rendering as a vector would result in a large, complex vector output.

See also: forceRasterRender

Since: QGIS 2.12

Definition at line 410 of file qgsrenderer.h.

void QgsFeatureRenderer::setLegendSymbolItem	(	const QString &	key,
		QgsSymbol *	symbol
	)

virtual

Sets the symbol to be used for a legend symbol item.

Parameters

key	rule key for legend symbol
symbol	new symbol for legend item. Ownership is transferred to renderer.

Since: QGIS 2.14

Reimplemented in QgsRuleBasedRenderer, QgsGraduatedSymbolRenderer, QgsCategorizedSymbolRenderer, QgsInvertedPolygonRenderer, QgsPointDistanceRenderer, and QgsSingleSymbolRenderer.

Definition at line 328 of file qgsrenderer.cpp.

void QgsFeatureRenderer::setOrderBy ( const QgsFeatureRequest::OrderBy & orderBy )

Define the order in which features shall be processed by this renderer.

Note: this property has no effect if orderByEnabled() is false

See also: setOrderByEnabled()

Since: QGIS 2.14

Definition at line 417 of file qgsrenderer.cpp.

void QgsFeatureRenderer::setOrderByEnabled ( bool enabled )

Sets whether custom ordering should be applied before features are processed by this renderer.

Parameters

enabled set to true to enable custom feature ordering

See also: setOrderBy(); orderByEnabled()

Since: QGIS 2.14

Definition at line 427 of file qgsrenderer.cpp.

void QgsFeatureRenderer::setPaintEffect ( QgsPaintEffect * effect )

Sets the current paint effect for the renderer.

Parameters

effect paint effect. Ownership is transferred to the renderer.

See also: paintEffect

Since: QGIS 2.9

Definition at line 406 of file qgsrenderer.cpp.

void QgsFeatureRenderer::setUsingSymbolLevels ( bool usingSymbolLevels )

inline

Definition at line 272 of file qgsrenderer.h.

void QgsFeatureRenderer::setVertexMarkerAppearance	(	int	type,
		double	size
	)

Sets type and size of editing vertex markers for subsequent rendering.

Definition at line 339 of file qgsrenderer.cpp.

void QgsFeatureRenderer::startRender	(	QgsRenderContext &	context,
		const QgsFields &	fields
	)

virtual

Must be called when a new render cycle is started.

A call to startRender() must always be followed by a corresponding call to stopRender() after all features have been rendered.

Parameters

context	Additional information passed to the renderer about the job which will be rendered
fields	The fields available for rendering

See also: stopRender()

Warning: This method is not thread safe. Before calling startRender() in a non-main thread, the renderer should instead be cloned and startRender()/stopRender() called on the clone.

Reimplemented in QgsRuleBasedRenderer, QgsCategorizedSymbolRenderer, QgsGraduatedSymbolRenderer, QgsPointDistanceRenderer, QgsInvertedPolygonRenderer, QgsPointDisplacementRenderer, QgsHeatmapRenderer, QgsSingleSymbolRenderer, Qgs25DRenderer, and QgsPointClusterRenderer.

Definition at line 92 of file qgsrenderer.cpp.

void QgsFeatureRenderer::stopRender ( QgsRenderContext & context )

virtual

Must be called when a render cycle has finished, to allow the renderer to clean up.

Calls to stopRender() must always be preceded by a call to startRender().

Warning: This method is not thread safe. Before calling startRender() in a non-main thread, the renderer should instead be cloned and startRender()/stopRender() called on the clone.

See also: startRender()

Reimplemented in QgsRuleBasedRenderer, QgsCategorizedSymbolRenderer, QgsGraduatedSymbolRenderer, QgsPointDistanceRenderer, QgsInvertedPolygonRenderer, QgsPointDisplacementRenderer, QgsHeatmapRenderer, QgsSingleSymbolRenderer, Qgs25DRenderer, QgsNullSymbolRenderer, and QgsPointClusterRenderer.

Definition at line 106 of file qgsrenderer.cpp.

virtual QgsSymbol* QgsFeatureRenderer::symbolForFeature	(	const QgsFeature &	feature,
		QgsRenderContext &	context
	)		const

pure virtual

To be overridden.

Must be called between startRender() and stopRender() calls.

Parameters

feature	feature
context	render context

Returns: returns pointer to symbol or 0 if symbol was not found

Since: QGIS 2.12

Implemented in QgsRuleBasedRenderer, QgsCategorizedSymbolRenderer, QgsGraduatedSymbolRenderer, QgsInvertedPolygonRenderer, QgsPointDistanceRenderer, QgsHeatmapRenderer, Qgs25DRenderer, QgsSingleSymbolRenderer, and QgsNullSymbolRenderer.

QgsSymbolList QgsFeatureRenderer::symbols ( QgsRenderContext & context ) const

virtual

Returns list of symbols used by the renderer.

Parameters

context render context

Since: QGIS 2.12

Reimplemented in QgsRuleBasedRenderer, QgsCategorizedSymbolRenderer, QgsGraduatedSymbolRenderer, QgsPointDistanceRenderer, QgsInvertedPolygonRenderer, QgsSingleSymbolRenderer, QgsHeatmapRenderer, Qgs25DRenderer, and QgsNullSymbolRenderer.

Definition at line 142 of file qgsrenderer.cpp.

QgsSymbolList QgsFeatureRenderer::symbolsForFeature	(	const QgsFeature &	feature,
		QgsRenderContext &	context
	)		const

virtual

Returns list of symbols used for rendering the feature.

For renderers that do not support MoreSymbolsPerFeature it is more efficient to use symbolForFeature()

Since: QGIS 2.12

Reimplemented in QgsRuleBasedRenderer, QgsInvertedPolygonRenderer, and QgsPointDistanceRenderer.

Definition at line 379 of file qgsrenderer.cpp.

virtual void QgsFeatureRenderer::toSld	(	QDomDocument &	doc,
		QDomElement &	element,
		const QgsStringMap &	props = `QgsStringMap()`
	)		const

inlinevirtual

used from subclasses to create SLD Rule elements following SLD v1.1 specs

Reimplemented in QgsRuleBasedRenderer, QgsCategorizedSymbolRenderer, QgsGraduatedSymbolRenderer, QgsPointDistanceRenderer, and QgsSingleSymbolRenderer.

Definition at line 300 of file qgsrenderer.h.

QString QgsFeatureRenderer::type ( ) const

inline

Definition at line 129 of file qgsrenderer.h.

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

pure virtual

Returns a list of attributes required by this renderer.

Attributes not listed in here may not have been requested from the provider at rendering time.

Returns: A set of attributes

Implemented in QgsRuleBasedRenderer, QgsCategorizedSymbolRenderer, QgsGraduatedSymbolRenderer, QgsPointDistanceRenderer, QgsInvertedPolygonRenderer, QgsHeatmapRenderer, QgsPointDisplacementRenderer, Qgs25DRenderer, QgsSingleSymbolRenderer, QgsNullSymbolRenderer, and QgsPointClusterRenderer.

bool QgsFeatureRenderer::usingSymbolLevels ( ) const

inline

Definition at line 271 of file qgsrenderer.h.

bool QgsFeatureRenderer::willRenderFeature	(	const QgsFeature &	feature,
		QgsRenderContext &	context
	)		const

virtual

Returns whether the renderer will render a feature or not.

Must be called between startRender() and stopRender() calls. Default implementation uses symbolForFeature().

Since: QGIS 2.12

Reimplemented in QgsRuleBasedRenderer, QgsInvertedPolygonRenderer, QgsPointDistanceRenderer, and QgsNullSymbolRenderer.

Definition at line 345 of file qgsrenderer.cpp.

QDomElement QgsFeatureRenderer::writeSld	(	QDomDocument &	doc,
		const QString &	styleName,
		const QgsStringMap &	props = `QgsStringMap()`
	)		const

virtual

create the SLD UserStyle element following the SLD v1.1 specs with the given name

Since: QGIS 2.8

Definition at line 296 of file qgsrenderer.cpp.

Member Data Documentation

double QgsFeatureRenderer::mCurrentVertexMarkerSize

protected

The current size of editing marker.

Definition at line 503 of file qgsrenderer.h.

int QgsFeatureRenderer::mCurrentVertexMarkerType

protected

The current type of editing marker.

Definition at line 501 of file qgsrenderer.h.

bool QgsFeatureRenderer::mForceRaster

protected

Definition at line 507 of file qgsrenderer.h.

QgsFeatureRequest::OrderBy QgsFeatureRenderer::mOrderBy

protected

Definition at line 521 of file qgsrenderer.h.

bool QgsFeatureRenderer::mOrderByEnabled

protected

Definition at line 523 of file qgsrenderer.h.

QgsPaintEffect* QgsFeatureRenderer::mPaintEffect = nullptr

protected

Definition at line 505 of file qgsrenderer.h.

QString QgsFeatureRenderer::mType

protected

Definition at line 496 of file qgsrenderer.h.

bool QgsFeatureRenderer::mUsingSymbolLevels

protected

Definition at line 498 of file qgsrenderer.h.

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

/build/qgis-3.4.15+24xenial/src/core/symbology/qgsrenderer.h
/build/qgis-3.4.15+24xenial/src/core/symbology/qgsrenderer.cpp

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