QgsVectorTileRenderer Class Reference

Abstract base class for all vector tile renderer implementations. More...

#include <qgsvectortilerenderer.h>

Inheritance diagram for QgsVectorTileRenderer:

Public Member Functions
virtual	~QgsVectorTileRenderer ()=default
virtual QgsVectorTileRenderer *	clone () const =0
	Returns a clone of the renderer.
virtual void	readXml (const QDomElement &elem, const QgsReadWriteContext &context)=0
	Reads renderer's properties from given XML element.
virtual void	renderBackground (QgsRenderContext &context)=0
	Renders the background if defined.
virtual void	renderSelectedFeatures (const QList< QgsFeature > &selection, QgsRenderContext &context)=0
	Renders the specified features in a selected state.
virtual void	renderTile (const QgsVectorTileRendererData &tile, QgsRenderContext &context)=0
	Renders given vector tile. Must be called between startRender/stopRender.
virtual QSet< QString >	requiredLayers (QgsRenderContext &context, int tileZoom) const
	Returns a list of the layers required for rendering.
virtual void	resolveReferences (const QgsProject &project)
	Resolves references to other objects - second phase of loading - after readXml()
virtual void	startRender (QgsRenderContext &context, int tileZoom, const QgsTileRange &tileRange)=0
	Initializes rendering. It should be paired with a stopRender() call.
virtual void	stopRender (QgsRenderContext &context)=0
	Finishes rendering and cleans up any resources.
virtual QString	type () const =0
	Returns unique type name of the renderer implementation.
virtual QMap< QString, QSet< QString > >	usedAttributes (const QgsRenderContext &)
	Returns field names of sub-layers that will be used for rendering. Must be called between startRender/stopRender.
virtual bool	willRenderFeature (const QgsFeature &feature, int tileZoom, const QString &layerName, QgsRenderContext &context)=0
	Returns true if the specified feature will be rendered in the given render context.
virtual void	writeXml (QDomElement &elem, const QgsReadWriteContext &context) const =0
	Writes renderer's properties to given XML element.

Detailed Description

Abstract base class for all vector tile renderer implementations.

For rendering it is expected that client code calls:

startRender() to prepare renderer

renderTile() for each tile

stopRender() to clean up renderer and free resources

Since

QGIS 3.14

Definition at line 122 of file qgsvectortilerenderer.h.

Constructor & Destructor Documentation

~QgsVectorTileRenderer()

virtual QgsVectorTileRenderer::~QgsVectorTileRenderer ( )

virtualdefault

Member Function Documentation

clone()

virtual QgsVectorTileRenderer * QgsVectorTileRenderer::clone ( ) const

pure virtual

Returns a clone of the renderer.

Implemented in QgsVectorTileBasicRenderer.

readXml()

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

pure virtual

Reads renderer's properties from given XML element.

Implemented in QgsVectorTileBasicRenderer.

renderBackground()

virtual void QgsVectorTileRenderer::renderBackground ( QgsRenderContext &  context )

pure virtual

Renders the background if defined.

Implemented in QgsVectorTileBasicRenderer.

renderSelectedFeatures()

virtual void QgsVectorTileRenderer::renderSelectedFeatures ( const QList< QgsFeature > &  selection, QgsRenderContext &  context  )

pure virtual

Renders the specified features in a selected state.

This will be called after rendering the tiles, so that the selected features are always visible on the top of the layer.

Since

QGIS 3.28

Implemented in QgsVectorTileBasicRenderer.

renderTile()

virtual void QgsVectorTileRenderer::renderTile ( const QgsVectorTileRendererData &  tile, QgsRenderContext &  context  )

pure virtual

Renders given vector tile. Must be called between startRender/stopRender.

Implemented in QgsVectorTileBasicRenderer.

requiredLayers()

virtual QSet< QString > QgsVectorTileRenderer::requiredLayers ( QgsRenderContext &  context, int  tileZoom  ) const

inlinevirtual

Returns a list of the layers required for rendering.

Only layers which are visible at the specified tileZoom should be included in this list.

An empty string present in the list indicates that all layer in the tiles are required.

Since

QGIS 3.16

Reimplemented in QgsVectorTileBasicRenderer.

Definition at line 163 of file qgsvectortilerenderer.h.

resolveReferences()

virtual void QgsVectorTileRenderer::resolveReferences ( const QgsProject &  project )

inlinevirtual

Resolves references to other objects - second phase of loading - after readXml()

Definition at line 195 of file qgsvectortilerenderer.h.

startRender()

virtual void QgsVectorTileRenderer::startRender ( QgsRenderContext &  context, int  tileZoom, const QgsTileRange &  tileRange  )

pure virtual

Initializes rendering. It should be paired with a stopRender() call.

Implemented in QgsVectorTileBasicRenderer.

stopRender()

virtual void QgsVectorTileRenderer::stopRender ( QgsRenderContext &  context )

pure virtual

Finishes rendering and cleans up any resources.

Implemented in QgsVectorTileBasicRenderer.

type()

virtual QString QgsVectorTileRenderer::type ( ) const

pure virtual

Returns unique type name of the renderer implementation.

Implemented in QgsVectorTileBasicRenderer.

usedAttributes()

virtual QMap< QString, QSet< QString > > QgsVectorTileRenderer::usedAttributes ( const QgsRenderContext &  )

inlinevirtual

Returns field names of sub-layers that will be used for rendering. Must be called between startRender/stopRender.

Reimplemented in QgsVectorTileBasicRenderer.

Definition at line 150 of file qgsvectortilerenderer.h.

willRenderFeature()

virtual bool QgsVectorTileRenderer::willRenderFeature ( const QgsFeature &  feature, int  tileZoom, const QString &  layerName, QgsRenderContext &  context  )

pure virtual

Returns true if the specified feature will be rendered in the given render context.

Since

QGIS 3.28

Implemented in QgsVectorTileBasicRenderer.

writeXml()

virtual void QgsVectorTileRenderer::writeXml ( QDomElement &  elem, const QgsReadWriteContext &  context  ) const

pure virtual

Writes renderer's properties to given XML element.

Implemented in QgsVectorTileBasicRenderer.

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

• /build/qgis-3.34.0+99sid/src/core/vectortile/qgsvectortilerenderer.h