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QgsMapRendererParallelJob Class Reference

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

#include <qgsmaprendererparalleljob.h>

Inheritance diagram for QgsMapRendererParallelJob:
Inheritance graph
[legend]

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 QgsLabelingResultstakeLabelingResults ()
 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
 
QgsPalLabelingmLabelingEngine
 
QgsRenderContext mLabelingRenderContext
 
QFuture< void > mLabelingFuture
 
QFutureWatcher< void > mLabelingFutureWatcher
 
- Protected Attributes inherited from QgsMapRendererJob
QgsMapSettings mSettings
 
Errors mErrors
 
QgsMapRendererCachemCache
 
QStringList mRequestedGeomCacheForLayers
 list of layer IDs for which the geometry cache should be updated More...
 
QMap< QString, QgsGeometryCachemGeometryCaches
 map of geometry caches More...
 
QTime mRenderingStart
 
int mRenderingTime
 

Additional Inherited Members

- Public Types inherited from QgsMapRendererJob
typedef QList< ErrorErrors
 
- 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.

Note
added in 2.4

Member Enumeration Documentation

anonymous enum
protected
Enumerator
Idle 
RenderingLayers 
RenderingLabels 

Constructor & Destructor Documentation

QgsMapRendererParallelJob::QgsMapRendererParallelJob ( const QgsMapSettings settings)
QgsMapRendererParallelJob::~QgsMapRendererParallelJob ( )

Member Function Documentation

void QgsMapRendererParallelJob::cancel ( )
virtual

Stop the rendering job - does not return until the job has terminated.

Does nothing if the rendering is not active.

Implements QgsMapRendererJob.

bool QgsMapRendererParallelJob::isActive ( ) const
virtual

Tell whether the rendering job is currently running in background.

Implements QgsMapRendererJob.

QImage QgsMapRendererParallelJob::renderedImage ( )
virtual

Get a preview/resulting image.

Implements QgsMapRendererQImageJob.

void QgsMapRendererParallelJob::renderingFinished ( )
protectedslot

all rendering is finished, including labeling

void QgsMapRendererParallelJob::renderLabelsStatic ( QgsMapRendererParallelJob self)
staticprotected
void QgsMapRendererParallelJob::renderLayersFinished ( )
protectedslot

layers are rendered, labeling is still pending

void QgsMapRendererParallelJob::renderLayerStatic ( LayerRenderJob job)
staticprotected
void QgsMapRendererParallelJob::start ( )
virtual

Start the rendering job and immediately return.

Does nothing if the rendering is already in progress.

Implements QgsMapRendererJob.

QgsLabelingResults * QgsMapRendererParallelJob::takeLabelingResults ( )
virtual

Get pointer to internal labeling engine (in order to get access to the results)

Implements QgsMapRendererJob.

void QgsMapRendererParallelJob::waitForFinished ( )
virtual

Block until the job has finished.

Implements QgsMapRendererJob.

Member Data Documentation

QImage QgsMapRendererParallelJob::mFinalImage
protected
QFuture<void> QgsMapRendererParallelJob::mFuture
protected
QFutureWatcher<void> QgsMapRendererParallelJob::mFutureWatcher
protected
QgsPalLabeling* QgsMapRendererParallelJob::mLabelingEngine
protected
QFuture<void> QgsMapRendererParallelJob::mLabelingFuture
protected
QFutureWatcher<void> QgsMapRendererParallelJob::mLabelingFutureWatcher
protected
QgsRenderContext QgsMapRendererParallelJob::mLabelingRenderContext
protected
LayerRenderJobs QgsMapRendererParallelJob::mLayerJobs
protected
enum { ... } QgsMapRendererParallelJob::mStatus

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