A simple direct line callout style. More...

#include <qgscallout.h>

Inheritance diagram for QgsSimpleLineCallout:

[legend]

Public Member Functions
	QgsSimpleLineCallout ()

	QgsSimpleLineCallout (const QgsSimpleLineCallout &other)

	~QgsSimpleLineCallout () override

QgsSimpleLineCallout *	clone () const override
	Duplicates a callout by creating a deep copy of the callout.

bool	drawCalloutToAllParts () const
	Returns `true` if callout lines should be drawn to all feature parts.

QgsLineSymbol *	lineSymbol ()
	Returns the line symbol used to render the callout line.

double	minimumLength () const
	Returns the minimum length of callout lines.

const QgsMapUnitScale &	minimumLengthMapUnitScale () const
	Returns the map unit scale for the minimum callout length.

Qgis::RenderUnit	minimumLengthUnit () const
	Returns the units for the minimum length of callout lines.

double	offsetFromAnchor () const
	Returns the offset distance from the anchor point at which to start the line.

const QgsMapUnitScale &	offsetFromAnchorMapUnitScale () const
	Returns the map unit scale for the offset from anchor.

Qgis::RenderUnit	offsetFromAnchorUnit () const
	Returns the units for the offset from anchor point.

double	offsetFromLabel () const
	Returns the offset distance from label area at which to end the line.

const QgsMapUnitScale &	offsetFromLabelMapUnitScale () const
	Returns the map unit scale for the minimum callout length.

Qgis::RenderUnit	offsetFromLabelUnit () const
	Returns the units for the offset from label area.

QgsSimpleLineCallout &	operator= (const QgsSimpleLineCallout &)=delete

QVariantMap	properties (const QgsReadWriteContext &context) const override
	Returns the properties describing the callout encoded in a string format.

void	readProperties (const QVariantMap &props, const QgsReadWriteContext &context) override
	Reads a string map of an callout's properties and restores the callout to the state described by the properties map.

QSet< QString >	referencedFields (const QgsRenderContext &context) const override
	Returns the set of attributes referenced by the callout.

void	setDrawCalloutToAllParts (bool drawToAllParts)
	Sets whether callout lines should be drawn to all feature parts.

void	setLineSymbol (QgsLineSymbol *symbol)
	Sets the line symbol used to render the callout line.

void	setMinimumLength (double length)
	Sets the minimum length of callout lines.

void	setMinimumLengthMapUnitScale (const QgsMapUnitScale &scale)
	Sets the map unit scale for the minimum callout length.

void	setMinimumLengthUnit (Qgis::RenderUnit unit)
	Sets the unit for the minimum length of callout lines.

void	setOffsetFromAnchor (double distance)
	Sets the offset distance from the anchor point at which to start the line.

void	setOffsetFromAnchorMapUnitScale (const QgsMapUnitScale &scale)
	Sets the map unit scale for the offset from anchor.

void	setOffsetFromAnchorUnit (Qgis::RenderUnit unit)
	Sets the unit for the offset from anchor distance.

void	setOffsetFromLabel (double distance)
	Sets the offset distance from label area at which to end the line.

void	setOffsetFromLabelMapUnitScale (const QgsMapUnitScale &scale)
	Sets the map unit scale for the offset from label area.

void	setOffsetFromLabelUnit (Qgis::RenderUnit unit)
	Sets the unit for the offset from label area distance.

void	startRender (QgsRenderContext &context) override
	Prepares the callout for rendering on the specified render context.

void	stopRender (QgsRenderContext &context) override
	Finalises the callout after a set of rendering operations on the specified render context.

QString	type () const override
	Returns a unique string representing the callout type.

Public Member Functions inherited from QgsCallout
	QgsCallout ()
	Constructor for QgsCallout.

virtual	~QgsCallout ()=default

AnchorPoint	anchorPoint () const
	Returns the feature's anchor point position.

QPainter::CompositionMode	blendMode () const
	Returns the blending mode used for drawing callouts.

bool	containsAdvancedEffects () const
	Returns `true` if the callout requires advanced effects such as blend modes, which require output in raster formats to be fully respected.

QgsPropertyCollection &	dataDefinedProperties ()
	Returns a reference to the callout's property collection, used for data defined overrides.

const QgsPropertyCollection &	dataDefinedProperties () const
	Returns a reference to the callout's property collection, used for data defined overrides.

virtual DrawOrder	drawOrder () const
	Returns the desired drawing order (stacking) to use while rendering this callout.

bool	enabled () const
	Returns `true` if the the callout is enabled.

LabelAnchorPoint	labelAnchorPoint () const
	Returns the label's anchor point position.

void	render (QgsRenderContext &context, const QRectF &rect, const double angle, const QgsGeometry &anchor, QgsCalloutContext &calloutContext)
	Renders the callout onto the specified render context.

virtual void	restoreProperties (const QDomElement &element, const QgsReadWriteContext &context)
	Restores the callout's properties from a DOM element.

virtual bool	saveProperties (QDomDocument &doc, QDomElement &element, const QgsReadWriteContext &context) const
	Saves the current state of the callout to a DOM element.

void	setAnchorPoint (AnchorPoint anchor)
	Sets the feature's anchor point position.

void	setBlendMode (QPainter::CompositionMode mode)
	Sets the blending mode used for drawing callouts.

void	setDataDefinedProperties (const QgsPropertyCollection &collection)
	Sets the callout's property collection, used for data defined overrides.

void	setEnabled (bool enabled)
	Sets whether the callout is enabled.

void	setLabelAnchorPoint (LabelAnchorPoint anchor)
	Sets the label's anchor point position.

Static Public Member Functions
static QgsCallout *	create (const QVariantMap &properties=QVariantMap(), const QgsReadWriteContext &context=QgsReadWriteContext())
	Creates a new QgsSimpleLineCallout, using the settings serialized in the properties map (corresponding to the output from QgsSimpleLineCallout::properties() ).

Static Public Member Functions inherited from QgsCallout
static QgsCallout::AnchorPoint	decodeAnchorPoint (const QString &name, bool *ok=nullptr)
	Attempts to decode a string representation of an anchor point name to the corresponding anchor point.

static QgsCallout::LabelAnchorPoint	decodeLabelAnchorPoint (const QString &name, bool *ok=nullptr)
	Attempts to decode a string representation of a label anchor point name to the corresponding anchor point.

static QString	encodeAnchorPoint (AnchorPoint anchor)
	Encodes an anchor point to its string representation.

static QString	encodeLabelAnchorPoint (LabelAnchorPoint anchor)
	Encodes a label anchor point to its string representation.

static QgsPropertiesDefinition	propertyDefinitions ()
	Returns the definitions for data defined properties available for use in callouts.

Protected Member Functions
virtual QgsCurve *	createCalloutLine (const QgsPoint &start, const QgsPoint &end, QgsRenderContext &context, const QRectF &bodyBoundingBox, const double angle, const QgsGeometry &anchor, QgsCallout::QgsCalloutContext &calloutContext) const
	Creates a callout line between start and end in the desired style.

void	draw (QgsRenderContext &context, const QRectF &bodyBoundingBox, const double angle, const QgsGeometry &anchor, QgsCallout::QgsCalloutContext &calloutContext) override
	Performs the actual rendering of the callout implementation onto the specified render context.

Protected Member Functions inherited from QgsCallout
QgsGeometry	calloutLabelPoint (const QRectF &bodyBoundingBox, double angle, LabelAnchorPoint anchor, QgsRenderContext &context, const QgsCalloutContext &calloutContext, bool &pinned) const
	Returns the anchor point geometry for a label with the given bounding box and anchor point mode.

QgsGeometry	calloutLineToPart (const QgsGeometry &labelGeometry, const QgsAbstractGeometry *partGeometry, QgsRenderContext &context, const QgsCalloutContext &calloutContext, bool &pinned) const
	Calculates the direct line from a label geometry to an anchor geometry part, respecting the various callout settings which influence how the callout end should be placed in the anchor geometry.

Q_DECL_DEPRECATED QgsGeometry	labelAnchorGeometry (const QRectF &bodyBoundingBox, const double angle, LabelAnchorPoint anchor) const
	Returns the anchor point geometry for a label with the given bounding box and anchor point mode.

Additional Inherited Members
Public Types inherited from QgsCallout
enum	AnchorPoint { PoleOfInaccessibility = 0 , PointOnExterior , PointOnSurface , Centroid }
	Feature's anchor point position. More...

enum	DrawOrder { OrderBelowAllLabels , OrderBelowIndividualLabels }
	Options for draw order (stacking) of callouts. More...

enum	LabelAnchorPoint { LabelPointOnExterior , LabelCentroid , LabelTopLeft , LabelTopMiddle , LabelTopRight , LabelMiddleLeft , LabelMiddleRight , LabelBottomLeft , LabelBottomMiddle , LabelBottomRight }
	Label's anchor point position. More...

enum class	Property : int { MinimumCalloutLength , OffsetFromAnchor , OffsetFromLabel , DrawCalloutToAllParts , AnchorPointPosition , LabelAnchorPointPosition , OriginX , OriginY , DestinationX , DestinationY , Curvature , Orientation , Margins , WedgeWidth , CornerRadius , BlendMode }
	Data definable properties. More...

Detailed Description

A simple direct line callout style.

Since: QGIS 3.10

Definition at line 513 of file qgscallout.h.

Constructor & Destructor Documentation

◆ QgsSimpleLineCallout() [1/2]

QgsSimpleLineCallout::QgsSimpleLineCallout ( )

Definition at line 531 of file qgscallout.cpp.

◆ ~QgsSimpleLineCallout()

QgsSimpleLineCallout::~QgsSimpleLineCallout ( )

overridedefault

◆ QgsSimpleLineCallout() [2/2]

QgsSimpleLineCallout::QgsSimpleLineCallout ( const QgsSimpleLineCallout & other )

Definition at line 539 of file qgscallout.cpp.

Member Function Documentation

◆ clone()

QgsSimpleLineCallout * QgsSimpleLineCallout::clone ( ) const

overridevirtual

Duplicates a callout by creating a deep copy of the callout.

Caller takes ownership of the returned object.

Implements QgsCallout.

Definition at line 568 of file qgscallout.cpp.

◆ create()

QgsCallout * QgsSimpleLineCallout::create	(	const QVariantMap &	properties = `QVariantMap()`,
		const QgsReadWriteContext &	context = `QgsReadWriteContext()`
	)

static

Creates a new QgsSimpleLineCallout, using the settings serialized in the properties map (corresponding to the output from QgsSimpleLineCallout::properties() ).

Definition at line 556 of file qgscallout.cpp.

◆ createCalloutLine()

QgsCurve * QgsSimpleLineCallout::createCalloutLine	(	const QgsPoint &	start,
		const QgsPoint &	end,
		QgsRenderContext &	context,
		const QRectF &	bodyBoundingBox,
		const double	angle,
		const QgsGeometry &	anchor,
		QgsCallout::QgsCalloutContext &	calloutContext
	)		const

protectedvirtual

Creates a callout line between start and end in the desired style.

The base class method returns a straight line.

Since: QGIS 3.20

Reimplemented in QgsManhattanLineCallout, and QgsCurvedLineCallout.

Definition at line 745 of file qgscallout.cpp.

◆ draw()

void QgsSimpleLineCallout::draw	(	QgsRenderContext &	context,
		const QRectF &	bodyBoundingBox,
		const double	angle,
		const QgsGeometry &	anchor,
		QgsCallout::QgsCalloutContext &	calloutContext
	)

overrideprotectedvirtual

Performs the actual rendering of the callout implementation onto the specified render context.

The bodyBoundingBox argument gives the desired size and position of the body of the callout (e.g. the actual label geometry). The angle argument specifies the rotation of the callout body (in degrees clockwise from horizontal). It is assumed that angle rotation specified via angle is applied around the center of rect.

The anchor argument dictates the geometry which the callout should connect to. Depending on the callout subclass and anchor geometry type, the actual shape of the rendered callout may vary. E.g. a subclass may prefer to attach to the centroid of the anchor, while another subclass may prefer to attach to the closest point on anchor instead.

Both rect and anchor are specified in painter coordinates (i.e. pixels).

The calloutContext argument is used to specify additional contextual information about how a callout is being rendered.

Implements QgsCallout.

Definition at line 655 of file qgscallout.cpp.

◆ drawCalloutToAllParts()

bool QgsSimpleLineCallout::drawCalloutToAllParts ( ) const

inline

Returns true if callout lines should be drawn to all feature parts.

See also: setDrawCalloutToAllParts()

Definition at line 695 of file qgscallout.h.

◆ lineSymbol()

QgsLineSymbol * QgsSimpleLineCallout::lineSymbol ( )

Returns the line symbol used to render the callout line.

Ownership is not transferred.

See also: setLineSymbol()

Definition at line 645 of file qgscallout.cpp.

◆ minimumLength()

double QgsSimpleLineCallout::minimumLength ( ) const

inline

Returns the minimum length of callout lines.

Units are specified through minimumLengthUnits().

See also: setMinimumLength(); minimumLengthUnit()

Definition at line 562 of file qgscallout.h.

◆ minimumLengthMapUnitScale()

const QgsMapUnitScale & QgsSimpleLineCallout::minimumLengthMapUnitScale ( ) const

inline

Returns the map unit scale for the minimum callout length.

See also: setMinimumLengthMapUnitScale(); minimumLengthUnit(); minimumLength()

Definition at line 599 of file qgscallout.h.

◆ minimumLengthUnit()

Qgis::RenderUnit QgsSimpleLineCallout::minimumLengthUnit ( ) const

inline

Returns the units for the minimum length of callout lines.

See also: setMinimumLengthUnit(); minimumLength()

Definition at line 583 of file qgscallout.h.

◆ offsetFromAnchor()

double QgsSimpleLineCallout::offsetFromAnchor ( ) const

inline

Returns the offset distance from the anchor point at which to start the line.

Units are specified through offsetFromAnchorUnit().

See also: setOffsetFromAnchor(); offsetFromAnchorUnit()

Definition at line 607 of file qgscallout.h.

◆ offsetFromAnchorMapUnitScale()

const QgsMapUnitScale & QgsSimpleLineCallout::offsetFromAnchorMapUnitScale ( ) const

inline

Returns the map unit scale for the offset from anchor.

See also: setOffsetFromAnchorMapUnitScale(); offsetFromAnchorUnit(); offsetFromAnchor()

Definition at line 644 of file qgscallout.h.

◆ offsetFromAnchorUnit()

Qgis::RenderUnit QgsSimpleLineCallout::offsetFromAnchorUnit ( ) const

inline

Returns the units for the offset from anchor point.

See also: setOffsetFromAnchorUnit(); offsetFromAnchor()

Definition at line 628 of file qgscallout.h.

◆ offsetFromLabel()

double QgsSimpleLineCallout::offsetFromLabel ( ) const

inline

Returns the offset distance from label area at which to end the line.

Units are specified through offsetFromLabelUnit().

See also: setOffsetFromLabel(); offsetFromLabelUnit()

Definition at line 651 of file qgscallout.h.

◆ offsetFromLabelMapUnitScale()

const QgsMapUnitScale & QgsSimpleLineCallout::offsetFromLabelMapUnitScale ( ) const

inline

Returns the map unit scale for the minimum callout length.

See also: setOffsetFromLabelMapUnitScale(); offsetFromLabelUnit(); offsetFromLabel()

Definition at line 688 of file qgscallout.h.

◆ offsetFromLabelUnit()

Qgis::RenderUnit QgsSimpleLineCallout::offsetFromLabelUnit ( ) const

inline

Returns the units for the offset from label area.

See also: setOffsetFromLabelUnit(); offsetFromLabel()

Definition at line 672 of file qgscallout.h.

◆ operator=()

QgsSimpleLineCallout & QgsSimpleLineCallout::operator= ( const QgsSimpleLineCallout & )

delete

◆ properties()

QVariantMap QgsSimpleLineCallout::properties ( const QgsReadWriteContext & context ) const

overridevirtual

Returns the properties describing the callout encoded in a string format.

Subclasses must ensure that they include the base class' properties() in their returned value.

See also: readProperties(); saveProperties()

Reimplemented from QgsCallout.

Definition at line 573 of file qgscallout.cpp.

◆ readProperties()

void QgsSimpleLineCallout::readProperties	(	const QVariantMap &	props,
		const QgsReadWriteContext &	context
	)

overridevirtual

Reads a string map of an callout's properties and restores the callout to the state described by the properties map.

Subclasses must ensure that they call the base class' readProperties() method.

See also: properties()

Reimplemented from QgsCallout.

Definition at line 597 of file qgscallout.cpp.

◆ referencedFields()

QSet< QString > QgsSimpleLineCallout::referencedFields ( const QgsRenderContext & context ) const

overridevirtual

Returns the set of attributes referenced by the callout.

This includes attributes required by any data defined properties associated with the callout.

Warning: This must only be called after a corresponding call to startRender() with the same render context.

Reimplemented from QgsCallout.

Definition at line 637 of file qgscallout.cpp.

◆ setDrawCalloutToAllParts()

void QgsSimpleLineCallout::setDrawCalloutToAllParts ( bool drawToAllParts )

inline

Sets whether callout lines should be drawn to all feature parts.

See also: drawCalloutToAllParts()

Definition at line 702 of file qgscallout.h.

◆ setLineSymbol()

void QgsSimpleLineCallout::setLineSymbol ( QgsLineSymbol * symbol )

Sets the line symbol used to render the callout line.

Ownership of symbol is transferred to the callout.

See also: lineSymbol()

Definition at line 650 of file qgscallout.cpp.

◆ setMinimumLength()

void QgsSimpleLineCallout::setMinimumLength ( double length )

inline

Sets the minimum length of callout lines.

Units are specified through setMinimumLengthUnit().

See also: minimumLength(); setMinimumLengthUnit()

Definition at line 569 of file qgscallout.h.

◆ setMinimumLengthMapUnitScale()

void QgsSimpleLineCallout::setMinimumLengthMapUnitScale ( const QgsMapUnitScale & scale )

inline

Sets the map unit scale for the minimum callout length.

See also: minimumLengthMapUnitScale(); setMinimumLengthUnit(); setMinimumLength()

Definition at line 591 of file qgscallout.h.

◆ setMinimumLengthUnit()

void QgsSimpleLineCallout::setMinimumLengthUnit ( Qgis::RenderUnit unit )

inline

Sets the unit for the minimum length of callout lines.

See also: minimumLengthUnit(); setMinimumLength()

Definition at line 576 of file qgscallout.h.

◆ setOffsetFromAnchor()

void QgsSimpleLineCallout::setOffsetFromAnchor ( double distance )

inline

Sets the offset distance from the anchor point at which to start the line.

Units are specified through setOffsetFromAnchorUnit().

See also: offsetFromAnchor(); setOffsetFromAnchorUnit()

Definition at line 614 of file qgscallout.h.

◆ setOffsetFromAnchorMapUnitScale()

void QgsSimpleLineCallout::setOffsetFromAnchorMapUnitScale ( const QgsMapUnitScale & scale )

inline

Sets the map unit scale for the offset from anchor.

See also: offsetFromAnchorMapUnitScale(); setOffsetFromAnchorUnit(); setOffsetFromAnchor()

Definition at line 636 of file qgscallout.h.

◆ setOffsetFromAnchorUnit()

void QgsSimpleLineCallout::setOffsetFromAnchorUnit ( Qgis::RenderUnit unit )

inline

Sets the unit for the offset from anchor distance.

See also: offsetFromAnchor(); setOffsetFromAnchor()

Definition at line 621 of file qgscallout.h.

◆ setOffsetFromLabel()

void QgsSimpleLineCallout::setOffsetFromLabel ( double distance )

inline

Sets the offset distance from label area at which to end the line.

Units are specified through setOffsetFromLabelUnit().

See also: offsetFromLabel(); setOffsetFromLabelUnit()

Definition at line 658 of file qgscallout.h.

◆ setOffsetFromLabelMapUnitScale()

void QgsSimpleLineCallout::setOffsetFromLabelMapUnitScale ( const QgsMapUnitScale & scale )

inline

Sets the map unit scale for the offset from label area.

See also: offsetFromLabelMapUnitScale(); setOffsetFromLabelUnit(); setOffsetFromLabel()

Definition at line 680 of file qgscallout.h.

◆ setOffsetFromLabelUnit()

void QgsSimpleLineCallout::setOffsetFromLabelUnit ( Qgis::RenderUnit unit )

inline

Sets the unit for the offset from label area distance.

See also: offsetFromLabel(); setOffsetFromLabel()

Definition at line 665 of file qgscallout.h.

◆ startRender()

void QgsSimpleLineCallout::startRender ( QgsRenderContext & context )

overridevirtual

Prepares the callout for rendering on the specified render context.

Warning: This MUST be called prior to calling render() on the callout, and must always be accompanied by a corresponding call to stopRender().

See also: stopRender()

Reimplemented from QgsCallout.

Definition at line 623 of file qgscallout.cpp.

◆ stopRender()

void QgsSimpleLineCallout::stopRender ( QgsRenderContext & context )

overridevirtual

Finalises the callout after a set of rendering operations on the specified render context.

Warning: This MUST be called after to after render() operations on the callout, and must always be accompanied by a corresponding prior call to startRender().

See also: startRender()

Reimplemented from QgsCallout.

Definition at line 630 of file qgscallout.cpp.

◆ type()

QString QgsSimpleLineCallout::type ( ) const

overridevirtual

Returns a unique string representing the callout type.

Implements QgsCallout.

Definition at line 563 of file qgscallout.cpp.

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

/build/qgis-3.41.0+git20241116+25ec5511245+99sid/src/core/callouts/qgscallout.h
/build/qgis-3.41.0+git20241116+25ec5511245+99sid/src/core/callouts/qgscallout.cpp

Public Member Functions

Static Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ QgsSimpleLineCallout() [1/2]

◆ ~QgsSimpleLineCallout()

◆ QgsSimpleLineCallout() [2/2]

Member Function Documentation

◆ clone()

◆ create()

◆ createCalloutLine()

◆ draw()

◆ drawCalloutToAllParts()

◆ lineSymbol()

◆ minimumLength()

◆ minimumLengthMapUnitScale()

◆ minimumLengthUnit()

◆ offsetFromAnchor()

◆ offsetFromAnchorMapUnitScale()

◆ offsetFromAnchorUnit()

◆ offsetFromLabel()

◆ offsetFromLabelMapUnitScale()

◆ offsetFromLabelUnit()

◆ operator=()

◆ properties()

◆ readProperties()

◆ referencedFields()

◆ setDrawCalloutToAllParts()

◆ setLineSymbol()

◆ setMinimumLength()

◆ setMinimumLengthMapUnitScale()

◆ setMinimumLengthUnit()

◆ setOffsetFromAnchor()

◆ setOffsetFromAnchorMapUnitScale()

◆ setOffsetFromAnchorUnit()

◆ setOffsetFromLabel()

◆ setOffsetFromLabelMapUnitScale()

◆ setOffsetFromLabelUnit()

◆ startRender()

◆ stopRender()

◆ type()