QgsLabelingEngineInterface Class Reference

Labeling engine interface. More...

#include <qgsmaprenderer.h>

Inheritance diagram for QgsLabelingEngineInterface:

Public Member Functions
virtual	~QgsLabelingEngineInterface ()
virtual void	init (QgsMapRenderer *mp)=0
	called when we're going to start with rendering
virtual bool	willUseLayer (QgsVectorLayer *layer)=0
	called to find out whether the layer is used for labeling
virtual void	clearActiveLayers ()=0
	clears all PAL layer settings for registered layers
virtual void	clearActiveLayer (QgsVectorLayer *layer)=0
	clears data defined objects from PAL layer settings for a registered layer
virtual int	prepareLayer (QgsVectorLayer *layer, QSet< int > &attrIndices, QgsRenderContext &ctx)=0
	called when starting rendering of a layer
virtual QgsPalLayerSettings &	layer (const QString &layerName)=0
	returns PAL layer settings for a registered layer
virtual int	addDiagramLayer (QgsVectorLayer *layer, QgsDiagramLayerSettings *s)
	adds a diagram layer to the labeling engine
virtual void	registerFeature (QgsVectorLayer *layer, QgsFeature &feat, const QgsRenderContext &context=QgsRenderContext())=0
	called for every feature
virtual void	registerDiagramFeature (QgsVectorLayer *layer, QgsFeature &feat, const QgsRenderContext &context=QgsRenderContext())
	called for every diagram feature
virtual void	drawLabeling (QgsRenderContext &context)=0
	called when the map is drawn and labels should be placed
virtual void	exit ()=0
	called when we're done with rendering
virtual QList< QgsLabelPosition >	labelsAtPosition (const QgsPoint &p)=0
	return infos about labels at a given (map) position
virtual QList< QgsLabelPosition >	labelsWithinRect (const QgsRectangle &r)=0
	return infos about labels within a given (map) rectangle
virtual QgsLabelingEngineInterface *	clone ()=0
	called when passing engine among map renderers

Detailed Description

Labeling engine interface.

Note

Added in QGIS v1.4

Definition at line 68 of file qgsmaprenderer.h.

Constructor & Destructor Documentation

virtual QgsLabelingEngineInterface::~QgsLabelingEngineInterface ( )

inlinevirtual

Definition at line 72 of file qgsmaprenderer.h.

Member Function Documentation

virtual int QgsLabelingEngineInterface::addDiagramLayer ( QgsVectorLayer *  layer, QgsDiagramLayerSettings *  s  )

inlinevirtual

adds a diagram layer to the labeling engine

Reimplemented in QgsPalLabeling.

Definition at line 91 of file qgsmaprenderer.h.

Referenced by QgsVectorLayer::prepareLabelingAndDiagrams().

virtual void QgsLabelingEngineInterface::clearActiveLayer ( QgsVectorLayer *  layer )

pure virtual

clears data defined objects from PAL layer settings for a registered layer

Note

: this method was added in version 1.9

Implemented in QgsPalLabeling.

virtual void QgsLabelingEngineInterface::clearActiveLayers ( )

pure virtual

clears all PAL layer settings for registered layers

Note

: this method was added in version 1.9

Implemented in QgsPalLabeling.

virtual QgsLabelingEngineInterface* QgsLabelingEngineInterface::clone ( )

pure virtual

called when passing engine among map renderers

Implemented in QgsPalLabeling.

Referenced by QgsComposerMap::draw().

virtual void QgsLabelingEngineInterface::drawLabeling ( QgsRenderContext &  context )

pure virtual

called when the map is drawn and labels should be placed

Implemented in QgsPalLabeling.

Referenced by QgsMapRenderer::render().

virtual void QgsLabelingEngineInterface::exit ( )

pure virtual

called when we're done with rendering

Implemented in QgsPalLabeling.

Referenced by QgsMapRenderer::render().

virtual void QgsLabelingEngineInterface::init ( QgsMapRenderer *  mp )

pure virtual

called when we're going to start with rendering

Implemented in QgsPalLabeling.

Referenced by QgsMapRenderer::render().

virtual QList<QgsLabelPosition> QgsLabelingEngineInterface::labelsAtPosition ( const QgsPoint &  p )

pure virtual

return infos about labels at a given (map) position

Note

: this method was added in version 1.7

Implemented in QgsPalLabeling.

virtual QList<QgsLabelPosition> QgsLabelingEngineInterface::labelsWithinRect ( const QgsRectangle &  r )

pure virtual

return infos about labels within a given (map) rectangle

Note

: this method was added in version 1.9

Implemented in QgsPalLabeling.

virtual QgsPalLayerSettings& QgsLabelingEngineInterface::layer ( const QString &  layerName )

pure virtual

returns PAL layer settings for a registered layer

Note

: this method was added in version 1.9

Implemented in QgsPalLabeling.

Referenced by QgsVectorLayer::prepareLabelingAndDiagrams().

virtual int QgsLabelingEngineInterface::prepareLayer ( QgsVectorLayer *  layer, QSet< int > &  attrIndices, QgsRenderContext &  ctx  )

pure virtual

called when starting rendering of a layer

Note

: this method was added in version 1.6

Implemented in QgsPalLabeling.

Referenced by QgsVectorLayer::prepareLabelingAndDiagrams().

virtual void QgsLabelingEngineInterface::registerDiagramFeature ( QgsVectorLayer *  layer, QgsFeature &  feat, const QgsRenderContext &  context = QgsRenderContext()  )

inlinevirtual

called for every diagram feature

Reimplemented in QgsPalLabeling.

Definition at line 96 of file qgsmaprenderer.h.

Referenced by QgsVectorLayer::drawRendererV2(), and QgsVectorLayer::drawRendererV2Levels().

virtual void QgsLabelingEngineInterface::registerFeature ( QgsVectorLayer *  layer, QgsFeature &  feat, const QgsRenderContext &  context = QgsRenderContext()  )

pure virtual

called for every feature

Implemented in QgsPalLabeling.

Referenced by QgsVectorLayer::drawRendererV2(), and QgsVectorLayer::drawRendererV2Levels().

virtual bool QgsLabelingEngineInterface::willUseLayer ( QgsVectorLayer *  layer )

pure virtual

called to find out whether the layer is used for labeling

Implemented in QgsPalLabeling.

Referenced by QgsMapRenderer::render().

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

• /tmp/buildd/qgis-2.2.0+wheezy1/src/core/qgsmaprenderer.h