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

#include <qgsdiagramrenderer.h>

Inheritance diagram for QgsDiagramRenderer:

Public Member Functions
	QgsDiagramRenderer ()=default
	Constructor for QgsDiagramRenderer. More...

virtual	~QgsDiagramRenderer ()=default

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

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

QgsDiagram *	diagram () const

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

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

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

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

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

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. More...

virtual QString	rendererName () const =0

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

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. More...

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

Protected Member Functions
	QgsDiagramRenderer (const QgsDiagramRenderer &other)

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

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

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

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). More...

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

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. More...

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

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

Detailed Description

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

Definition at line 684 of file qgsdiagramrenderer.h.

Constructor & Destructor Documentation

◆ QgsDiagramRenderer() [1/2]

QgsDiagramRenderer::QgsDiagramRenderer ( )

default

Constructor for QgsDiagramRenderer.

◆ ~QgsDiagramRenderer()

virtual QgsDiagramRenderer::~QgsDiagramRenderer ( )

virtualdefault

◆ QgsDiagramRenderer() [2/2]

QgsDiagramRenderer::QgsDiagramRenderer ( const QgsDiagramRenderer & other )

protected

Definition at line 449 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 560 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 589 of file qgsdiagramrenderer.cpp.

◆ attributeLegend()

bool QgsDiagramRenderer::attributeLegend ( ) const

inline

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

See also: setAttributeLegend()

Since: QGIS 2.16

Definition at line 764 of file qgsdiagramrenderer.h.

◆ clone()

virtual QgsDiagramRenderer* QgsDiagramRenderer::clone ( ) const

pure virtual

Returns new instance that is equivalent to this one.

Since: QGIS 2.4

Implemented in QgsLinearlyInterpolatedDiagramRenderer, and QgsSingleCategoryDiagramRenderer.

◆ convertSizeToMapUnits()

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

protected

Converts size from mm to map units.

Definition at line 535 of file qgsdiagramrenderer.cpp.

◆ diagram()

QgsDiagram* QgsDiagramRenderer::diagram ( ) const

inline

Definition at line 733 of file qgsdiagramrenderer.h.

◆ diagramAttributes()

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

pure virtual

Returns attribute indices needed for diagram rendering.

Implemented in QgsLinearlyInterpolatedDiagramRenderer, and QgsSingleCategoryDiagramRenderer.

◆ diagramSettings() [1/2]

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

pure virtual

Returns list with all diagram settings in the renderer.

Implemented in QgsLinearlyInterpolatedDiagramRenderer, and QgsSingleCategoryDiagramRenderer.

◆ 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 QgsLinearlyInterpolatedDiagramRenderer, and QgsSingleCategoryDiagramRenderer.

◆ diagramSize()

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

protectedpure virtual

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

Implemented in QgsLinearlyInterpolatedDiagramRenderer, and QgsSingleCategoryDiagramRenderer.

◆ dpiPaintDevice()

int QgsDiagramRenderer::dpiPaintDevice ( const QPainter * painter )

staticprotected

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

Definition at line 547 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

Since: QGIS 2.10

Reimplemented in QgsLinearlyInterpolatedDiagramRenderer, and QgsSingleCategoryDiagramRenderer.

Definition at line 925 of file qgsdiagramrenderer.cpp.

◆ operator=()

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

protected

Definition at line 455 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 QgsLinearlyInterpolatedDiagramRenderer, and QgsSingleCategoryDiagramRenderer.

◆ 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

Since: QGIS 2.16

Reimplemented in QgsLinearlyInterpolatedDiagramRenderer.

Definition at line 515 of file qgsdiagramrenderer.cpp.

◆ renderDiagram()

void QgsDiagramRenderer::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.

Definition at line 462 of file qgsdiagramrenderer.cpp.

◆ rendererName()

virtual QString QgsDiagramRenderer::rendererName ( ) const

pure virtual

Implemented in QgsLinearlyInterpolatedDiagramRenderer, and QgsSingleCategoryDiagramRenderer.

◆ 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()

Since: QGIS 2.16

Definition at line 772 of file qgsdiagramrenderer.h.

◆ setDiagram()

void QgsDiagramRenderer::setDiagram ( QgsDiagram * d )

Definition at line 441 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.

Definition at line 497 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 QgsLinearlyInterpolatedDiagramRenderer, and QgsSingleCategoryDiagramRenderer.

Member Data Documentation

◆ mDiagram

std::unique_ptr< QgsDiagram > QgsDiagramRenderer::mDiagram

protected

Reference to the object that does the real diagram rendering.

Definition at line 810 of file qgsdiagramrenderer.h.

◆ mShowAttributeLegend

bool QgsDiagramRenderer::mShowAttributeLegend = true

protected

Whether to show an attribute legend for the diagrams.

Definition at line 813 of file qgsdiagramrenderer.h.

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

/build/qgis-3.20.0+99unstable/src/core/qgsdiagramrenderer.h
/build/qgis-3.20.0+99unstable/src/core/qgsdiagramrenderer.cpp

Public Member Functions

Protected Member Functions

Static Protected Member Functions

Protected Attributes

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()

Member Data Documentation

◆ mDiagram

◆ mShowAttributeLegend