Job implementation that renders all layers in parallel. More...

#include <qgsmaprendererparalleljob.h>

Inheritance diagram for QgsMapRendererParallelJob:

Collaboration diagram for QgsMapRendererParallelJob:

Public Member Functions
	QgsMapRendererParallelJob (const QgsMapSettings &settings)

	~QgsMapRendererParallelJob ()

virtual void	start ()
	Start the rendering job and immediately return. More...

virtual void	cancel ()
	Stop the rendering job - does not return until the job has terminated. More...

virtual void	waitForFinished ()
	Block until the job has finished. More...

virtual bool	isActive () const
	Tell whether the rendering job is currently running in background. More...

virtual QgsLabelingResults *	takeLabelingResults ()
	Get pointer to internal labeling engine (in order to get access to the results) More...

virtual QImage	renderedImage ()
	Get a preview/resulting image. More...

Public Member Functions inherited from QgsMapRendererQImageJob
	QgsMapRendererQImageJob (const QgsMapSettings &settings)

Public Member Functions inherited from QgsMapRendererJob
	QgsMapRendererJob (const QgsMapSettings &settings)

virtual	~QgsMapRendererJob ()

Errors	errors () const
	List of errors that happened during the rendering job - available when the rendering has been finished. More...

void	setCache (QgsMapRendererCache *cache)
	Assign a cache to be used for reading and storing rendered images of individual layers. More...

void	setRequestedGeometryCacheForLayers (const QStringList &layerIds)
	Set which vector layers should be cached while rendering. More...

int	renderingTime () const
	Find out how log it took to finish the job (in miliseconds) More...

Protected Types
enum	{ Idle, RenderingLayers, RenderingLabels }

Protected Slots
void	renderLayersFinished ()
	layers are rendered, labeling is still pending More...

void	renderingFinished ()
	all rendering is finished, including labeling More...

Static Protected Member Functions
static void	renderLayerStatic (LayerRenderJob &job)

static void	renderLabelsStatic (QgsMapRendererParallelJob *self)

Static Protected Member Functions inherited from QgsMapRendererJob
static bool	reprojectToLayerExtent (const QgsCoordinateTransform *ct, bool layerCrsGeographic, QgsRectangle &extent, QgsRectangle &r2)
	Convenience function to project an extent into the layer source CRS, but also split it into two extents if it crosses the +/- 180 degree line. More...

static QImage	composeImage (const QgsMapSettings &settings, const LayerRenderJobs &jobs)

static void	drawLabeling (const QgsMapSettings &settings, QgsRenderContext &renderContext, QgsPalLabeling labelingEngine, QPainter painter)

static void	drawOldLabeling (const QgsMapSettings &settings, QgsRenderContext &renderContext)

static void	drawNewLabeling (const QgsMapSettings &settings, QgsRenderContext &renderContext, QgsPalLabeling *labelingEngine)

Protected Attributes
QImage	mFinalImage

enum QgsMapRendererParallelJob:: { ... }	mStatus

QFuture< void >	mFuture

QFutureWatcher< void >	mFutureWatcher

LayerRenderJobs	mLayerJobs

QgsPalLabeling *	mLabelingEngine

QgsRenderContext	mLabelingRenderContext

QFuture< void >	mLabelingFuture

QFutureWatcher< void >	mLabelingFutureWatcher

Protected Attributes inherited from QgsMapRendererJob
QgsMapSettings	mSettings

Errors	mErrors

QgsMapRendererCache *	mCache

QStringList	mRequestedGeomCacheForLayers
	list of layer IDs for which the geometry cache should be updated More...

QMap< QString, QgsGeometryCache >	mGeometryCaches
	map of geometry caches More...

QTime	mRenderingStart

int	mRenderingTime

Additional Inherited Members
Public Types inherited from QgsMapRendererJob
typedef QList< Error >	Errors

Signals inherited from QgsMapRendererJob
void	finished ()
	emitted when asynchronous rendering is finished (or canceled). More...

Protected Member Functions inherited from QgsMapRendererJob
LayerRenderJobs	prepareJobs (QPainter painter, QgsPalLabeling labelingEngine)

void	cleanupJobs (LayerRenderJobs &jobs)

bool	needTemporaryImage (QgsMapLayer *ml)

void	updateLayerGeometryCaches ()
	called when rendering has finished to update all layers' geometry caches More...

Detailed Description

Job implementation that renders all layers in parallel.

The resulting map image can be retrieved with renderedImage() function. It is safe to call that function while rendering is active to see preview of the map.