Evaluates and returns the diagram settings relating to a diagram for a specific feature. More...

#include <qgsdiagramrenderer.h>

Inheritance diagram for QgsDiagramRenderer:

[legend]

Public Member Functions
	QgsDiagramRenderer ()=default

virtual	~QgsDiagramRenderer ()=default

bool	attributeLegend () const
	Returns `true` if renderer will show legend items for diagram attributes.

virtual QgsDiagramRenderer *	clone () const =0
	Returns new instance that is equivalent to this one.

QgsDiagram *	diagram () const

virtual QList< QString >	diagramAttributes () const =0
	Returns attribute indices needed for diagram rendering.

virtual QList< QgsDiagramSettings >	diagramSettings () const =0
	Returns list with all diagram settings in the renderer.

virtual QList< QgsLayerTreeModelLegendNode * >	legendItems (QgsLayerTreeLayer *nodeLayer) const
	Returns list of legend nodes for the diagram.

virtual void	readXml (const QDomElement &elem, const QgsReadWriteContext &context)=0
	Reads diagram state from a DOM element.

virtual QSet< QString >	referencedFields (const QgsExpressionContext &context=QgsExpressionContext()) const
	Returns the set of any fields required for diagram rendering.

virtual void	renderDiagram (const QgsFeature &feature, QgsRenderContext &c, QPointF pos, const QgsPropertyCollection &properties=QgsPropertyCollection()) const
	Renders the diagram for a specified feature at a specific position in the passed render context.

virtual QString	rendererName () const =0

void	setAttributeLegend (bool enabled)
	Sets whether the renderer will show legend items for diagram attributes.

void	setDiagram (QgsDiagram *d)

virtual QSizeF	sizeMapUnits (const QgsFeature &feature, const QgsRenderContext &c) const
	Returns size of the diagram for a feature in map units. Returns an invalid QSizeF in case of error.

virtual void	writeXml (QDomElement &layerElem, QDomDocument &doc, const QgsReadWriteContext &context) const =0
	Writes diagram state to a DOM element.

Protected Member Functions
	QgsDiagramRenderer (const QgsDiagramRenderer &other)

void	_readXml (const QDomElement &elem, const QgsReadWriteContext &context)
	Reads internal QgsDiagramRenderer state from a DOM element.

void	_writeXml (QDomElement &rendererElem, QDomDocument &doc, const QgsReadWriteContext &context) const
	Writes internal QgsDiagramRenderer diagram state to a DOM element.

void	convertSizeToMapUnits (QSizeF &size, const QgsRenderContext &context) const
	Converts size from mm to map units.

virtual bool	diagramSettings (const QgsFeature &feature, const QgsRenderContext &c, QgsDiagramSettings &s) const =0
	Returns diagram settings for a feature (or `false` if the diagram for the feature is not to be rendered).

virtual QSizeF	diagramSize (const QgsFeature &feature, const QgsRenderContext &c) const =0
	Returns size of the diagram (in painter units) or an invalid size in case of error.

QgsDiagramRenderer &	operator= (const QgsDiagramRenderer &other)

Static Protected Member Functions
static int	dpiPaintDevice (const QPainter *)
	Returns the paint device dpi (or -1 in case of error.

Protected Attributes
std::unique_ptr< QgsDiagram >	mDiagram
	Reference to the object that does the real diagram rendering.

bool	mShowAttributeLegend = true
	Whether to show an attribute legend for the diagrams.

Friends
class	QgsStackedDiagramRenderer

Detailed Description

Evaluates and returns the diagram settings relating to a diagram for a specific feature.

Definition at line 738 of file qgsdiagramrenderer.h.

Constructor & Destructor Documentation

◆ QgsDiagramRenderer() [1/2]

QgsDiagramRenderer::QgsDiagramRenderer ( )

default

◆ ~QgsDiagramRenderer()

virtual QgsDiagramRenderer::~QgsDiagramRenderer ( )

virtualdefault

◆ QgsDiagramRenderer() [2/2]

QgsDiagramRenderer::QgsDiagramRenderer ( const QgsDiagramRenderer & other )

protected

Definition at line 481 of file qgsdiagramrenderer.cpp.

Member Function Documentation

◆ _readXml()

void QgsDiagramRenderer::_readXml	(	const QDomElement &	elem,
		const QgsReadWriteContext &	context
	)

protected

Reads internal QgsDiagramRenderer state from a DOM element.

See also: _writeXml()

Definition at line 612 of file qgsdiagramrenderer.cpp.

◆ _writeXml()

void QgsDiagramRenderer::_writeXml	(	QDomElement &	rendererElem,
		QDomDocument &	doc,
		const QgsReadWriteContext &	context
	)		const

protected

Writes internal QgsDiagramRenderer diagram state to a DOM element.

See also: _readXml()

Definition at line 645 of file qgsdiagramrenderer.cpp.

◆ attributeLegend()

bool QgsDiagramRenderer::attributeLegend ( ) const

inline

Returns true if renderer will show legend items for diagram attributes.

See also: setAttributeLegend()

Definition at line 813 of file qgsdiagramrenderer.h.

◆ clone()

virtual QgsDiagramRenderer * QgsDiagramRenderer::clone ( ) const

pure virtual

Returns new instance that is equivalent to this one.

Implemented in QgsSingleCategoryDiagramRenderer, QgsLinearlyInterpolatedDiagramRenderer, and QgsStackedDiagramRenderer.

◆ convertSizeToMapUnits()

void QgsDiagramRenderer::convertSizeToMapUnits	(	QSizeF &	size,
		const QgsRenderContext &	context
	)		const

protected

Converts size from mm to map units.

Definition at line 587 of file qgsdiagramrenderer.cpp.

◆ diagram()

QgsDiagram * QgsDiagramRenderer::diagram ( ) const

inline

Definition at line 784 of file qgsdiagramrenderer.h.

◆ diagramAttributes()

virtual QList< QString > QgsDiagramRenderer::diagramAttributes ( ) const

pure virtual

Returns attribute indices needed for diagram rendering.

Implemented in QgsSingleCategoryDiagramRenderer, QgsLinearlyInterpolatedDiagramRenderer, and QgsStackedDiagramRenderer.

◆ diagramSettings() [1/2]

virtual QList< QgsDiagramSettings > QgsDiagramRenderer::diagramSettings ( ) const

pure virtual

Returns list with all diagram settings in the renderer.

Implemented in QgsSingleCategoryDiagramRenderer, QgsLinearlyInterpolatedDiagramRenderer, and QgsStackedDiagramRenderer.

◆ diagramSettings() [2/2]

virtual bool QgsDiagramRenderer::diagramSettings	(	const QgsFeature &	feature,
		const QgsRenderContext &	c,
		QgsDiagramSettings &	s
	)		const

protectedpure virtual

Returns diagram settings for a feature (or false if the diagram for the feature is not to be rendered).

Used internally within renderDiagram()

Parameters

feature	the feature
c	render context
s	out: diagram settings for the feature

Implemented in QgsSingleCategoryDiagramRenderer, QgsLinearlyInterpolatedDiagramRenderer, and QgsStackedDiagramRenderer.

◆ diagramSize()

virtual QSizeF QgsDiagramRenderer::diagramSize	(	const QgsFeature &	feature,
		const QgsRenderContext &	c
	)		const

protectedpure virtual

Returns size of the diagram (in painter units) or an invalid size in case of error.

Parameters

feature	the feature
c	render context

Implemented in QgsSingleCategoryDiagramRenderer, QgsLinearlyInterpolatedDiagramRenderer, and QgsStackedDiagramRenderer.

◆ dpiPaintDevice()

int QgsDiagramRenderer::dpiPaintDevice ( const QPainter * painter )

staticprotected

Returns the paint device dpi (or -1 in case of error.

Definition at line 599 of file qgsdiagramrenderer.cpp.

◆ legendItems()

QList< QgsLayerTreeModelLegendNode * > QgsDiagramRenderer::legendItems ( QgsLayerTreeLayer * nodeLayer ) const

virtual

Returns list of legend nodes for the diagram.

Note: caller is responsible for deletion of QgsLayerTreeModelLegendNodes

Reimplemented in QgsSingleCategoryDiagramRenderer, QgsLinearlyInterpolatedDiagramRenderer, and QgsStackedDiagramRenderer.

Definition at line 1308 of file qgsdiagramrenderer.cpp.

◆ operator=()

QgsDiagramRenderer & QgsDiagramRenderer::operator= ( const QgsDiagramRenderer & other )

protected

Definition at line 487 of file qgsdiagramrenderer.cpp.

◆ readXml()

virtual void QgsDiagramRenderer::readXml	(	const QDomElement &	elem,
		const QgsReadWriteContext &	context
	)

pure virtual

Reads diagram state from a DOM element.

Subclasses should ensure that _readXml() is called by their readXml implementation to restore the general QgsDiagramRenderer settings.

See also: writeXml()

Implemented in QgsSingleCategoryDiagramRenderer, QgsLinearlyInterpolatedDiagramRenderer, and QgsStackedDiagramRenderer.

◆ referencedFields()

QSet< QString > QgsDiagramRenderer::referencedFields ( const QgsExpressionContext & context = QgsExpressionContext() ) const

virtual

Returns the set of any fields required for diagram rendering.

Parameters

context expression context the diagrams will be drawn using

Reimplemented in QgsLinearlyInterpolatedDiagramRenderer.

Definition at line 567 of file qgsdiagramrenderer.cpp.

◆ renderDiagram()

void QgsDiagramRenderer::renderDiagram	(	const QgsFeature &	feature,
		QgsRenderContext &	c,
		QPointF	pos,
		const QgsPropertyCollection &	properties = `QgsPropertyCollection()`
	)		const

virtual

Renders the diagram for a specified feature at a specific position in the passed render context.

Reimplemented in QgsStackedDiagramRenderer.

Definition at line 494 of file qgsdiagramrenderer.cpp.

◆ rendererName()

virtual QString QgsDiagramRenderer::rendererName ( ) const

pure virtual

Implemented in QgsSingleCategoryDiagramRenderer, QgsLinearlyInterpolatedDiagramRenderer, and QgsStackedDiagramRenderer.

◆ setAttributeLegend()

void QgsDiagramRenderer::setAttributeLegend ( bool enabled )

inline

Sets whether the renderer will show legend items for diagram attributes.

Parameters

enabled set to true to show diagram attribute legend

See also: attributeLegend()

Definition at line 820 of file qgsdiagramrenderer.h.

◆ setDiagram()

void QgsDiagramRenderer::setDiagram ( QgsDiagram * d )

Definition at line 473 of file qgsdiagramrenderer.cpp.

◆ sizeMapUnits()

QSizeF QgsDiagramRenderer::sizeMapUnits	(	const QgsFeature &	feature,
		const QgsRenderContext &	c
	)		const

virtual

Returns size of the diagram for a feature in map units. Returns an invalid QSizeF in case of error.

Reimplemented in QgsStackedDiagramRenderer.

Definition at line 529 of file qgsdiagramrenderer.cpp.

◆ writeXml()

virtual void QgsDiagramRenderer::writeXml	(	QDomElement &	layerElem,
		QDomDocument &	doc,
		const QgsReadWriteContext &	context
	)		const

pure virtual

Writes diagram state to a DOM element.

Subclasses should ensure that _writeXml() is called by their writeXml implementation to save the general QgsDiagramRenderer settings.

See also: readXml()

Implemented in QgsSingleCategoryDiagramRenderer, QgsLinearlyInterpolatedDiagramRenderer, and QgsStackedDiagramRenderer.

Friends And Related Symbol Documentation

◆ QgsStackedDiagramRenderer

friend class QgsStackedDiagramRenderer

friend

Definition at line 867 of file qgsdiagramrenderer.h.

Member Data Documentation

◆ mDiagram

std::unique_ptr< QgsDiagram > QgsDiagramRenderer::mDiagram

protected

Reference to the object that does the real diagram rendering.

Definition at line 862 of file qgsdiagramrenderer.h.

◆ mShowAttributeLegend

bool QgsDiagramRenderer::mShowAttributeLegend = true

protected

Whether to show an attribute legend for the diagrams.

Definition at line 865 of file qgsdiagramrenderer.h.

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

/build/qgis-3.99.0+git20250718+f78f5286a64+99sid/src/core/qgsdiagramrenderer.h
/build/qgis-3.99.0+git20250718+f78f5286a64+99sid/src/core/qgsdiagramrenderer.cpp

Public Member Functions

Protected Member Functions

Static Protected Member Functions

Protected Attributes

Friends

Detailed Description

Constructor & Destructor Documentation

◆ QgsDiagramRenderer() [1/2]

◆ ~QgsDiagramRenderer()

◆ QgsDiagramRenderer() [2/2]

Member Function Documentation

◆ _readXml()

◆ _writeXml()

◆ attributeLegend()

◆ clone()

◆ convertSizeToMapUnits()

◆ diagram()

◆ diagramAttributes()

◆ diagramSettings() [1/2]

◆ diagramSettings() [2/2]

◆ diagramSize()

◆ dpiPaintDevice()

◆ legendItems()

◆ operator=()

◆ readXml()

◆ referencedFields()

◆ renderDiagram()

◆ rendererName()

◆ setAttributeLegend()

◆ setDiagram()

◆ sizeMapUnits()

◆ writeXml()

Friends And Related Symbol Documentation

◆ QgsStackedDiagramRenderer

Member Data Documentation

◆ mDiagram

◆ mShowAttributeLegend