#include <qgscategorizedsymbolrenderer.h>

Inheritance diagram for QgsCategorizedSymbolRenderer:

Public Member Functions
	QgsCategorizedSymbolRenderer (const QString &attrName=QString(), const QgsCategoryList &categories=QgsCategoryList())

void	addCategory (const QgsRendererCategory &category)

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

const QgsCategoryList &	categories () const

int	categoryIndexForLabel (const QString &val)
	return index of category with specified label (-1 if not found or not unique) More...

int	categoryIndexForValue (const QVariant &val)
	return index of category with specified value (-1 if not found) More...

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

QString	classAttribute () const

QgsCategorizedSymbolRenderer *	clone () const override
	Create a deep copy of this renderer. More...

QgsDataDefinedSizeLegend *	dataDefinedSizeLegend () const
	Returns configuration of appearance of legend when using data-defined size for marker symbols. More...

void	deleteAllCategories ()

bool	deleteCategory (int catIndex)

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

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

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

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

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

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

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

void	moveCategory (int from, int to)
	Moves the category at index position from to index position to. More...

QgsSymbol *	originalSymbolForFeature (QgsFeature &feature, QgsRenderContext &context) override
	Return symbol for feature. More...

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

void	setClassAttribute (const QString &attr)

void	setDataDefinedSizeLegend (QgsDataDefinedSizeLegend *settings)
	Configures appearance of legend when renderer is configured to use data-defined size for marker symbols. More...

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

void	setSourceColorRamp (QgsColorRamp *ramp)
	Sets the source color ramp. More...

void	setSourceSymbol (QgsSymbol *sym)
	Sets the source symbol for the renderer, which is the base symbol used for the each categories' symbol before applying the categories' color. More...

void	sortByLabel (Qt::SortOrder order=Qt::AscendingOrder)

void	sortByValue (Qt::SortOrder order=Qt::AscendingOrder)

QgsColorRamp *	sourceColorRamp ()
	Returns the source color ramp, from which each categories' color is derived. More...

QgsSymbol *	sourceSymbol ()
	Returns the renderer's source symbol, which is the base symbol used for the each categories' symbol before applying the categories' color. More...

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

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

QgsSymbol *	symbolForFeature (QgsFeature &feature, QgsRenderContext &context) override
	To be overridden. More...

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

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

bool	updateCategoryLabel (int catIndex, const QString &label)

bool	updateCategoryRenderState (int catIndex, bool render)

bool	updateCategorySymbol (int catIndex, QgsSymbol *symbol)

bool	updateCategoryValue (int catIndex, const QVariant &value)

void	updateColorRamp (QgsColorRamp *ramp)
	Update the color ramp used and all symbols colors. More...

void	updateSymbols (QgsSymbol *sym)
	Update all the symbols but leave categories and colors. More...

QSet< QString >	usedAttributes (const QgsRenderContext &context) const override
	Return a list of attributes required by this renderer. More...

Public Member Functions inherited from QgsFeatureRenderer
virtual	~QgsFeatureRenderer ()

virtual const QgsFeatureRenderer *	embeddedRenderer () const
	Returns the current embedded renderer (subrenderer) for this feature renderer. 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 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
	Get 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 QgsSymbolList	originalSymbolsForFeature (QgsFeature &feat, QgsRenderContext &context)
	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 (QgsFeature &feature, QgsRenderContext &context, int layer=-1, bool selected=false, bool drawVertexMarker=false)
	Render a feature using this renderer in the given context. 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...

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, int size)
	set type and size of editing vertex markers for subsequent rendering More...

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

QString	type () const

bool	usingSymbolLevels () const

virtual bool	willRenderFeature (QgsFeature &feat, QgsRenderContext &context)
	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 QgsCategorizedSymbolRenderer *	convertFromRenderer (const QgsFeatureRenderer *renderer)
	creates a QgsCategorizedSymbolRenderer from an existing renderer. More...

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

Static Public Member Functions inherited from QgsFeatureRenderer
static QgsFeatureRenderer *	defaultRenderer (QgsWkbTypes::GeometryType geomType)
	return 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
void	rebuildHash ()

Q_DECL_DEPRECATED QgsSymbol *	skipRender ()

Q_DECL_DEPRECATED QgsSymbol *	symbolForValue (const QVariant &value)
	Returns the matching symbol corresponding to an attribute value. More...

QgsSymbol *	symbolForValue (const QVariant &value, bool &foundMatchingSymbol)
	Returns the matching symbol corresponding to an attribute value. More...

Protected Member Functions inherited from QgsFeatureRenderer
	QgsFeatureRenderer (const QString &type)

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

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

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...

Protected Attributes
QString	mAttrName

int	mAttrNum = -1
	attribute index (derived from attribute name in startRender) More...

QgsCategoryList	mCategories

bool	mCounting = false

std::unique_ptr< QgsDataDefinedSizeLegend >	mDataDefinedSizeLegend

std::unique_ptr< QgsExpression >	mExpression

std::unique_ptr< QgsColorRamp >	mSourceColorRamp

std::unique_ptr< QgsSymbol >	mSourceSymbol

QHash< QString, QgsSymbol * >	mSymbolHash
	hashtable for faster access to symbols More...

Protected Attributes inherited from QgsFeatureRenderer
int	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

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

Static Protected Member Functions inherited from QgsFeatureRenderer
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)

Detailed Description

Definition at line 93 of file qgscategorizedsymbolrenderer.h.

Constructor & Destructor Documentation

◆ QgsCategorizedSymbolRenderer()

QgsCategorizedSymbolRenderer::QgsCategorizedSymbolRenderer	(	const QString &	attrName = `QString()`,
		const QgsCategoryList &	categories = `QgsCategoryList()`
	)

Definition at line 147 of file qgscategorizedsymbolrenderer.cpp.

Member Function Documentation

◆ addCategory()

void QgsCategorizedSymbolRenderer::addCategory ( const QgsRendererCategory & category )

Definition at line 309 of file qgscategorizedsymbolrenderer.cpp.

◆ capabilities()

QgsFeatureRenderer::Capabilities QgsCategorizedSymbolRenderer::capabilities ( )

inlineoverridevirtual

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 from QgsFeatureRenderer.

Definition at line 107 of file qgscategorizedsymbolrenderer.h.

◆ categories()

const QgsCategoryList& QgsCategorizedSymbolRenderer::categories ( ) const

inline

Definition at line 119 of file qgscategorizedsymbolrenderer.h.

◆ categoryIndexForLabel()

int QgsCategorizedSymbolRenderer::categoryIndexForLabel ( const QString & val )

return index of category with specified label (-1 if not found or not unique)

Since: QGIS 2.5

Definition at line 261 of file qgscategorizedsymbolrenderer.cpp.

◆ categoryIndexForValue()

int QgsCategorizedSymbolRenderer::categoryIndexForValue ( const QVariant & val )

return index of category with specified value (-1 if not found)

Definition at line 251 of file qgscategorizedsymbolrenderer.cpp.

◆ checkLegendSymbolItem()

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

overridevirtual

item in symbology was checked

Since: QGIS 2.5

Reimplemented from QgsFeatureRenderer.

Definition at line 891 of file qgscategorizedsymbolrenderer.cpp.

◆ classAttribute()

QString QgsCategorizedSymbolRenderer::classAttribute ( ) const

inline

Definition at line 147 of file qgscategorizedsymbolrenderer.h.

◆ clone()

QgsCategorizedSymbolRenderer * QgsCategorizedSymbolRenderer::clone ( ) const

overridevirtual

Create a deep copy of this renderer.

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

Returns: A copy of this renderer

Implements QgsFeatureRenderer.

Definition at line 451 of file qgscategorizedsymbolrenderer.cpp.

◆ convertFromRenderer()

QgsCategorizedSymbolRenderer * QgsCategorizedSymbolRenderer::convertFromRenderer ( const QgsFeatureRenderer * renderer )

static

creates a QgsCategorizedSymbolRenderer from an existing renderer.

Returns: a new renderer if the conversion was possible, otherwise 0.

Since: QGIS 2.5

Definition at line 899 of file qgscategorizedsymbolrenderer.cpp.

◆ create()

QgsFeatureRenderer * QgsCategorizedSymbolRenderer::create	(	QDomElement &	element,
		const QgsReadWriteContext &	context
	)

static

create renderer from XML element

Definition at line 562 of file qgscategorizedsymbolrenderer.cpp.

◆ dataDefinedSizeLegend()

QgsDataDefinedSizeLegend * QgsCategorizedSymbolRenderer::dataDefinedSizeLegend ( ) const

Returns configuration of appearance of legend when using data-defined size for marker symbols.

Will return null if the functionality is disabled.

Since: QGIS 3.0

Definition at line 944 of file qgscategorizedsymbolrenderer.cpp.

◆ deleteAllCategories()

void QgsCategorizedSymbolRenderer::deleteAllCategories ( )

Definition at line 329 of file qgscategorizedsymbolrenderer.cpp.

◆ deleteCategory()

bool QgsCategorizedSymbolRenderer::deleteCategory ( int catIndex )

Definition at line 320 of file qgscategorizedsymbolrenderer.cpp.

◆ dump()

QString QgsCategorizedSymbolRenderer::dump ( ) const

overridevirtual

Returns debug information about this renderer.

Reimplemented from QgsFeatureRenderer.

Definition at line 443 of file qgscategorizedsymbolrenderer.cpp.

◆ filter()

QString QgsCategorizedSymbolRenderer::filter ( const QgsFields & fields = QgsFields() )

overridevirtual

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 from QgsFeatureRenderer.

Definition at line 479 of file qgscategorizedsymbolrenderer.cpp.

◆ legendClassificationAttribute()

QString QgsCategorizedSymbolRenderer::legendClassificationAttribute ( ) const

inlineoverridevirtual

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

Since: QGIS 2.6

Reimplemented from QgsFeatureRenderer.

Definition at line 200 of file qgscategorizedsymbolrenderer.h.

◆ legendKeysForFeature()

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

overridevirtual

Return legend keys matching a specified feature.

Since: QGIS 2.14

Reimplemented from QgsFeatureRenderer.

Definition at line 792 of file qgscategorizedsymbolrenderer.cpp.

◆ legendSymbolItemChecked()

bool QgsCategorizedSymbolRenderer::legendSymbolItemChecked ( const QString & key )

overridevirtual

items of symbology items in legend is checked

Since: QGIS 2.5

Reimplemented from QgsFeatureRenderer.

Definition at line 871 of file qgscategorizedsymbolrenderer.cpp.

◆ legendSymbolItems()

QgsLegendSymbolList QgsCategorizedSymbolRenderer::legendSymbolItems ( ) const

overridevirtual

Returns a list of symbology items for the legend.

Since: QGIS 2.6

Reimplemented from QgsFeatureRenderer.

Definition at line 752 of file qgscategorizedsymbolrenderer.cpp.

◆ legendSymbolItemsCheckable()

bool QgsCategorizedSymbolRenderer::legendSymbolItemsCheckable ( ) const

overridevirtual

items of symbology items in legend should be checkable

Since: QGIS 2.5

Reimplemented from QgsFeatureRenderer.

Definition at line 866 of file qgscategorizedsymbolrenderer.cpp.

◆ moveCategory()

void QgsCategorizedSymbolRenderer::moveCategory	(	int	from,
		int	to
	)

Moves the category at index position from to index position to.

Definition at line 334 of file qgscategorizedsymbolrenderer.cpp.

◆ originalSymbolForFeature()

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

overridevirtual

Return 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 from QgsFeatureRenderer.

Definition at line 233 of file qgscategorizedsymbolrenderer.cpp.

◆ rebuildHash()

void QgsCategorizedSymbolRenderer::rebuildHash ( )

protected

Definition at line 164 of file qgscategorizedsymbolrenderer.cpp.

◆ save()

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

overridevirtual

store renderer info to XML element

Reimplemented from QgsFeatureRenderer.

Definition at line 659 of file qgscategorizedsymbolrenderer.cpp.

◆ setClassAttribute()

void QgsCategorizedSymbolRenderer::setClassAttribute ( const QString & attr )

inline

Definition at line 148 of file qgscategorizedsymbolrenderer.h.

◆ setDataDefinedSizeLegend()

void QgsCategorizedSymbolRenderer::setDataDefinedSizeLegend ( QgsDataDefinedSizeLegend * settings )

Configures appearance of legend when renderer is configured to use data-defined size for marker symbols.

This allows configuring for which values (symbol sizes) should be shown in the legend, whether to display different symbol sizes collapsed in one legend node or separated across multiple legend nodes etc.

When renderer does not use data-defined size or does not use marker symbols, these settings will be ignored. Takes ownership of the passed settings objects. Null pointer is a valid input that disables data-defined size legend.

Since: QGIS 3.0

Definition at line 939 of file qgscategorizedsymbolrenderer.cpp.

◆ setLegendSymbolItem()

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

overridevirtual

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 from QgsFeatureRenderer.

Definition at line 881 of file qgscategorizedsymbolrenderer.cpp.

◆ setSourceColorRamp()

void QgsCategorizedSymbolRenderer::setSourceColorRamp ( QgsColorRamp * ramp )

Sets the source color ramp.

Parameters

ramp	color ramp. Ownership is transferred to the renderer

See also: sourceColorRamp(); setSourceSymbol()

Definition at line 826 of file qgscategorizedsymbolrenderer.cpp.

◆ setSourceSymbol()

void QgsCategorizedSymbolRenderer::setSourceSymbol ( QgsSymbol * sym )

Sets the source symbol for the renderer, which is the base symbol used for the each categories' symbol before applying the categories' color.

Parameters

sym	source symbol, ownership is transferred to the renderer

See also: sourceSymbol(); setSourceColorRamp()

Definition at line 816 of file qgscategorizedsymbolrenderer.cpp.

◆ skipRender()

QgsSymbol * QgsCategorizedSymbolRenderer::skipRender ( )

protected

Deprecated:: No longer used, will be removed in QGIS 4.0

Definition at line 175 of file qgscategorizedsymbolrenderer.cpp.

◆ sortByLabel()

void QgsCategorizedSymbolRenderer::sortByLabel ( Qt::SortOrder order = Qt::AscendingOrder )

Definition at line 371 of file qgscategorizedsymbolrenderer.cpp.

◆ sortByValue()

void QgsCategorizedSymbolRenderer::sortByValue ( Qt::SortOrder order = Qt::AscendingOrder )

Definition at line 349 of file qgscategorizedsymbolrenderer.cpp.

◆ sourceColorRamp()

QgsColorRamp * QgsCategorizedSymbolRenderer::sourceColorRamp ( )

Returns the source color ramp, from which each categories' color is derived.

See also: setSourceColorRamp(); sourceSymbol()

Definition at line 821 of file qgscategorizedsymbolrenderer.cpp.

◆ sourceSymbol()

QgsSymbol * QgsCategorizedSymbolRenderer::sourceSymbol ( )

Returns the renderer's source symbol, which is the base symbol used for the each categories' symbol before applying the categories' color.

See also: setSourceSymbol(); sourceColorRamp()

Definition at line 812 of file qgscategorizedsymbolrenderer.cpp.

◆ startRender()

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

overridevirtual

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 from QgsFeatureRenderer.

Definition at line 383 of file qgscategorizedsymbolrenderer.cpp.

◆ stopRender()

void QgsCategorizedSymbolRenderer::stopRender ( QgsRenderContext & context )

overridevirtual

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 from QgsFeatureRenderer.

Definition at line 406 of file qgscategorizedsymbolrenderer.cpp.

◆ symbolForFeature()

QgsSymbol * QgsCategorizedSymbolRenderer::symbolForFeature	(	QgsFeature &	feature,
		QgsRenderContext &	context
	)

overridevirtual

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

Implements QgsFeatureRenderer.

Definition at line 210 of file qgscategorizedsymbolrenderer.cpp.

◆ symbolForValue() [1/2]

QgsSymbol * QgsCategorizedSymbolRenderer::symbolForValue ( const QVariant & value )

protected

Returns the matching symbol corresponding to an attribute value.

Deprecated:: use variant which takes a second bool argument instead.

Definition at line 180 of file qgscategorizedsymbolrenderer.cpp.

◆ symbolForValue() [2/2]

QgsSymbol * QgsCategorizedSymbolRenderer::symbolForValue	(	const QVariant &	value,
		bool &	foundMatchingSymbol
	)

protected

Returns the matching symbol corresponding to an attribute value.

Will return nullptr if no matching symbol was found for value, or if the category corresponding to value is currently disabled (see QgsRendererCategory::renderState()).

If foundMatchingSymbol is specified then it will be set to true if a matching category was found. This can be used to differentiate between a nullptr returned as a result of no matching category vs a nullptr as a result of disabled categories.

Note: available in Python bindings as symbolForValue2

Definition at line 186 of file qgscategorizedsymbolrenderer.cpp.

◆ symbols()

QgsSymbolList QgsCategorizedSymbolRenderer::symbols ( QgsRenderContext & context )

overridevirtual

Returns list of symbols used by the renderer.

Parameters

context render context

Since: QGIS 2.12

Reimplemented from QgsFeatureRenderer.

Definition at line 550 of file qgscategorizedsymbolrenderer.cpp.

◆ toSld()

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

overridevirtual

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

Reimplemented from QgsFeatureRenderer.

Definition at line 467 of file qgscategorizedsymbolrenderer.cpp.

◆ updateCategoryLabel()

bool QgsCategorizedSymbolRenderer::updateCategoryLabel	(	int	catIndex,
		const QString &	label
	)

Definition at line 293 of file qgscategorizedsymbolrenderer.cpp.

◆ updateCategoryRenderState()

bool QgsCategorizedSymbolRenderer::updateCategoryRenderState	(	int	catIndex,
		bool	render
	)

Since: QGIS 2.5

Definition at line 301 of file qgscategorizedsymbolrenderer.cpp.

◆ updateCategorySymbol()

bool QgsCategorizedSymbolRenderer::updateCategorySymbol	(	int	catIndex,
		QgsSymbol *	symbol
	)

Definition at line 285 of file qgscategorizedsymbolrenderer.cpp.

◆ updateCategoryValue()

bool QgsCategorizedSymbolRenderer::updateCategoryValue	(	int	catIndex,
		const QVariant &	value
	)

Definition at line 277 of file qgscategorizedsymbolrenderer.cpp.

◆ updateColorRamp()

void QgsCategorizedSymbolRenderer::updateColorRamp ( QgsColorRamp * ramp )

Update the color ramp used and all symbols colors.

Parameters

ramp	color ramp. Ownership is transferred to the renderer

Since: QGIS 2.5

Definition at line 831 of file qgscategorizedsymbolrenderer.cpp.

◆ updateSymbols()

void QgsCategorizedSymbolRenderer::updateSymbols ( QgsSymbol * sym )

Update all the symbols but leave categories and colors.

This method also sets the source symbol for the renderer.

Parameters

sym	source symbol to use for categories. Ownership is not transferred.

See also: setSourceSymbol()

Definition at line 853 of file qgscategorizedsymbolrenderer.cpp.

◆ usedAttributes()

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

overridevirtual

Return 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

Implements QgsFeatureRenderer.

Definition at line 417 of file qgscategorizedsymbolrenderer.cpp.

Member Data Documentation

◆ mAttrName

QString QgsCategorizedSymbolRenderer::mAttrName

protected

Definition at line 229 of file qgscategorizedsymbolrenderer.h.

◆ mAttrNum

int QgsCategorizedSymbolRenderer::mAttrNum = -1

protected

attribute index (derived from attribute name in startRender)

Definition at line 238 of file qgscategorizedsymbolrenderer.h.

◆ mCategories

QgsCategoryList QgsCategorizedSymbolRenderer::mCategories

protected

Definition at line 230 of file qgscategorizedsymbolrenderer.h.

◆ mCounting

bool QgsCategorizedSymbolRenderer::mCounting = false

protected

Definition at line 242 of file qgscategorizedsymbolrenderer.h.

◆ mDataDefinedSizeLegend

std::unique_ptr<QgsDataDefinedSizeLegend> QgsCategorizedSymbolRenderer::mDataDefinedSizeLegend

protected

Definition at line 235 of file qgscategorizedsymbolrenderer.h.

◆ mExpression

std::unique_ptr<QgsExpression> QgsCategorizedSymbolRenderer::mExpression

protected

Definition at line 233 of file qgscategorizedsymbolrenderer.h.

◆ mSourceColorRamp

std::unique_ptr<QgsColorRamp> QgsCategorizedSymbolRenderer::mSourceColorRamp

protected

Definition at line 232 of file qgscategorizedsymbolrenderer.h.

◆ mSourceSymbol

std::unique_ptr<QgsSymbol> QgsCategorizedSymbolRenderer::mSourceSymbol

protected

Definition at line 231 of file qgscategorizedsymbolrenderer.h.

◆ mSymbolHash

QHash<QString, QgsSymbol *> QgsCategorizedSymbolRenderer::mSymbolHash

protected

hashtable for faster access to symbols

Definition at line 241 of file qgscategorizedsymbolrenderer.h.

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

/tmp/buildd/qgis-3.0.2+14stretch/src/core/symbology/qgscategorizedsymbolrenderer.h
/tmp/buildd/qgis-3.0.2+14stretch/src/core/symbology/qgscategorizedsymbolrenderer.cpp

Public Member Functions

Static Public Member Functions

Protected Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ QgsCategorizedSymbolRenderer()

Member Function Documentation

◆ addCategory()

◆ capabilities()

◆ categories()

◆ categoryIndexForLabel()

◆ categoryIndexForValue()

◆ checkLegendSymbolItem()

◆ classAttribute()

◆ clone()

◆ convertFromRenderer()

◆ create()

◆ dataDefinedSizeLegend()

◆ deleteAllCategories()

◆ deleteCategory()

◆ dump()

◆ filter()

◆ legendClassificationAttribute()

◆ legendKeysForFeature()

◆ legendSymbolItemChecked()

◆ legendSymbolItems()

◆ legendSymbolItemsCheckable()

◆ moveCategory()

◆ originalSymbolForFeature()

◆ rebuildHash()

◆ save()

◆ setClassAttribute()

◆ setDataDefinedSizeLegend()

◆ setLegendSymbolItem()

◆ setSourceColorRamp()

◆ setSourceSymbol()

◆ skipRender()

◆ sortByLabel()

◆ sortByValue()

◆ sourceColorRamp()

◆ sourceSymbol()

◆ startRender()

◆ stopRender()

◆ symbolForFeature()

◆ symbolForValue() [1/2]

◆ symbolForValue() [2/2]

◆ symbols()

◆ toSld()

◆ updateCategoryLabel()

◆ updateCategoryRenderState()

◆ updateCategorySymbol()

◆ updateCategoryValue()

◆ updateColorRamp()

◆ updateSymbols()

◆ usedAttributes()

Member Data Documentation

◆ mAttrName

◆ mAttrNum

◆ mCategories

◆ mCounting

◆ mDataDefinedSizeLegend

◆ mExpression

◆ mSourceColorRamp

◆ mSourceSymbol

◆ mSymbolHash