Contains information about the context of a rendering operation. More...

#include <qgsrendercontext.h>

Collaboration diagram for QgsRenderContext:

Public Member Functions
	QgsRenderContext ()
	~QgsRenderContext ()
const QPainter *	constPainter () const
const QgsCoordinateTransform *	coordinateTransform () const
bool	drawEditingInformation () const
const QgsRectangle &	extent () const
bool	forceVectorOutput () const
QgsLabelingEngineInterface *	labelingEngine () const
	Added in QGIS v1.4.
const QgsMapToPixel &	mapToPixel () const
QPainter *	painter ()
double	rasterScaleFactor () const
double	rendererScale () const
bool	renderingStopped () const
double	scaleFactor () const
QColor	selectionColor () const
	Added in QGIS v2.0.
void	setCoordinateTransform (const QgsCoordinateTransform *t)
	Sets coordinate transformation.
void	setDrawEditingInformation (bool b)
void	setExtent (const QgsRectangle &extent)
void	setForceVectorOutput (bool force)
	Added in QGIS v1.5.
void	setLabelingEngine (QgsLabelingEngineInterface *iface)
	Added in QGIS v1.4.
void	setMapToPixel (const QgsMapToPixel &mtp)
void	setPainter (QPainter *p)
void	setRasterScaleFactor (double factor)
void	setRendererScale (double scale)
void	setRenderingStopped (bool stopped)
void	setScaleFactor (double factor)
void	setSelectionColor (const QColor &color)
	Added in QGIS v2.0.
void	setUseAdvancedEffects (bool enabled)
	Used to enable or disable advanced effects such as blend modes.
bool	useAdvancedEffects () const
	Returns true if advanced effects such as blend modes such be used.
Private Attributes
const QgsCoordinateTransform *	mCoordTransform
	For transformation between coordinate systems.
bool	mDrawEditingInformation
	True if vertex markers for editing should be drawn.
QgsRectangle	mExtent
bool	mForceVectorOutput
	If true then no rendered vector elements should be cached as image.
QgsLabelingEngineInterface *	mLabelingEngine
	Labeling engine (can be NULL)
QgsMapToPixel	mMapToPixel
QPainter *	mPainter
	Painter for rendering operations.
double	mRasterScaleFactor
	Factor to scale rasters.
double	mRendererScale
	Map scale.
bool	mRenderingStopped
	True if the rendering has been canceled.
double	mScaleFactor
	Factor to scale line widths and point marker sizes.
QColor	mSelectionColor
	Color used for features that are marked as selected.
bool	mUseAdvancedEffects
	Flag if advanced visual effects such as blend modes should be used.

Detailed Description

Contains information about the context of a rendering operation.

The context of a rendering operation defines properties such as the conversion ratio between screen and map units, the extents / bounding box to be rendered etc.

Definition at line 37 of file qgsrendercontext.h.

Constructor & Destructor Documentation

QgsRenderContext::QgsRenderContext ( )

Definition at line 21 of file qgsrendercontext.cpp.

QgsRenderContext::~QgsRenderContext ( )

Definition at line 36 of file qgsrendercontext.cpp.

Member Function Documentation

const QPainter* QgsRenderContext::constPainter ( ) const [inline]

Definition at line 46 of file qgsrendercontext.h.

const QgsCoordinateTransform* QgsRenderContext::coordinateTransform ( ) const [inline]

Definition at line 48 of file qgsrendercontext.h.

Referenced by QgsFeatureRendererV2::_getLineString(), QgsFeatureRendererV2::_getPoint(), QgsFeatureRendererV2::_getPolygon(), QgsRasterLayer::draw(), QgsPALObjectPositionManager::findObjectPositions(), and QgsLabel::renderLabel().

bool QgsRenderContext::drawEditingInformation ( ) const [inline]

Definition at line 69 of file qgsrendercontext.h.

const QgsRectangle& QgsRenderContext::extent ( ) const [inline]

Definition at line 50 of file qgsrendercontext.h.

Referenced by QgsFeatureRendererV2::_getLineString(), QgsFeatureRendererV2::_getPolygon(), QgsRasterLayer::draw(), QgsVectorLayer::draw(), QgsPalLabeling::drawLabeling(), QgsVectorLayer::drawLabels(), QgsPALObjectPositionManager::findObjectPositions(), QgsAttributeTableFilterModel::generateListOfVisibleFeatures(), QgsVectorLayer::prepareLabelingAndDiagrams(), and QgsPointDisplacementRenderer::startRender().

bool QgsRenderContext::forceVectorOutput ( ) const [inline]

Definition at line 60 of file qgsrendercontext.h.

Referenced by QgsSimpleMarkerSymbolLayerV2::startRender().

QgsLabelingEngineInterface* QgsRenderContext::labelingEngine ( ) const [inline]

Added in QGIS v1.4.

Definition at line 74 of file qgsrendercontext.h.

Referenced by QgsVectorLayer::drawRendererV2(), QgsVectorLayer::drawRendererV2Levels(), QgsVectorLayer::prepareLabelingAndDiagrams(), and QgsMapRenderer::render().

const QgsMapToPixel& QgsRenderContext::mapToPixel ( ) const [inline]

QPainter* QgsRenderContext::painter ( ) [inline]

Definition at line 45 of file qgsrendercontext.h.

Referenced by QgsRasterLayer::draw(), QgsPointDisplacementRenderer::drawCircle(), QgsPalLabeling::drawLabel(), QgsPalLabeling::drawLabelBackground(), QgsPalLabeling::drawLabelBuffer(), QgsPalLabeling::drawLabeling(), QgsPointDisplacementRenderer::drawLabels(), QgsPalLabeling::drawLabelShadow(), QgsVectorFieldSymbolLayer::drawPreviewIcon(), QgsMapRenderer::render(), QgsPieDiagram::renderDiagram(), QgsHistogramDiagram::renderDiagram(), QgsTextDiagram::renderDiagram(), QgsPointDisplacementRenderer::renderFeature(), QgsLabel::renderLabel(), QgsEllipseSymbolLayerV2::renderPoint(), QgsSimpleMarkerSymbolLayerV2::renderPoint(), QgsSvgMarkerSymbolLayerV2::renderPoint(), QgsFontMarkerSymbolLayerV2::renderPoint(), QgsSimpleFillSymbolLayerV2::renderPolygon(), QgsImageFillSymbolLayer::renderPolygon(), QgsSimpleLineSymbolLayerV2::renderPolyline(), QgsLineDecorationSymbolLayerV2::renderPolyline(), and QgsFeatureRendererV2::renderVertexMarker().

double QgsRenderContext::rasterScaleFactor ( ) const [inline]

Definition at line 56 of file qgsrendercontext.h.

Referenced by QgsSVGFillSymbolLayer::applyPattern(), QgsLinePatternFillSymbolLayer::applyPattern(), QgsPointPatternFillSymbolLayer::applyPattern(), QgsRasterLayer::draw(), QgsPalLabeling::drawLabel(), QgsPointDisplacementRenderer::drawLabels(), QgsSymbolLayerV2Utils::pixelSizeScaleFactor(), QgsPalLabeling::prepareLayer(), QgsMapRenderer::render(), QgsLabel::renderLabel(), QgsSimpleMarkerSymbolLayerV2::renderPoint(), QgsSvgMarkerSymbolLayerV2::renderPoint(), QgsPalLayerSettings::scaleToPixelContext(), QgsSimpleFillSymbolLayerV2::startRender(), and QgsSimpleMarkerSymbolLayerV2::startRender().

double QgsRenderContext::rendererScale ( ) const [inline]

Definition at line 71 of file qgsrendercontext.h.

Referenced by QgsVectorLayer::drawLabels(), QgsPALObjectPositionManager::findObjectPositions(), QgsPalLayerSettings::registerFeature(), QgsMapRenderer::render(), QgsTextDiagram::renderDiagram(), QgsPointDisplacementRenderer::startRender(), and QgsRuleBasedRendererV2::Rule::startRender().

bool QgsRenderContext::renderingStopped ( ) const [inline]

Definition at line 58 of file qgsrendercontext.h.

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

double QgsRenderContext::scaleFactor ( ) const [inline]

QColor QgsRenderContext::selectionColor ( ) const [inline]

Added in QGIS v2.0.

Definition at line 77 of file qgsrendercontext.h.

Referenced by QgsVectorLayer::drawRendererV2Levels(), QgsSimpleMarkerSymbolLayerV2::prepareCache(), QgsSvgMarkerSymbolLayerV2::renderPoint(), QgsFontMarkerSymbolLayerV2::renderPoint(), QgsImageFillSymbolLayer::renderPolygon(), QgsSimpleFillSymbolLayerV2::startRender(), QgsSimpleLineSymbolLayerV2::startRender(), QgsSimpleMarkerSymbolLayerV2::startRender(), and QgsLineDecorationSymbolLayerV2::startRender().

void QgsRenderContext::setCoordinateTransform ( const QgsCoordinateTransform * t )

Sets coordinate transformation.

QgsRenderContext does not take ownership

Definition at line 40 of file qgsrendercontext.cpp.

References mCoordTransform.

Referenced by QgsMapRenderer::render().

void QgsRenderContext::setDrawEditingInformation ( bool b ) [inline]

Definition at line 85 of file qgsrendercontext.h.

Referenced by QgsComposerMap::draw(), and QgsMapRenderer::render().

void QgsRenderContext::setExtent ( const QgsRectangle & extent ) [inline]

Definition at line 84 of file qgsrendercontext.h.

Referenced by QgsMapRenderer::adjustExtentToSize(), QgsAttributeTableFilterModel::generateListOfVisibleFeatures(), and QgsMapRenderer::render().

void QgsRenderContext::setForceVectorOutput ( bool force ) [inline]

Added in QGIS v1.5.

Definition at line 92 of file qgsrendercontext.h.

Referenced by QgsPointPatternFillSymbolLayer::applyPattern(), and QgsComposerMap::draw().

void QgsRenderContext::setLabelingEngine ( QgsLabelingEngineInterface * iface ) [inline]

Added in QGIS v1.4.

Definition at line 94 of file qgsrendercontext.h.

Referenced by QgsMapRenderer::render().

void QgsRenderContext::setMapToPixel ( const QgsMapToPixel & mtp ) [inline]

Definition at line 83 of file qgsrendercontext.h.

Referenced by QgsMapRenderer::adjustExtentToSize(), QgsPointPatternFillSymbolLayer::applyPattern(), QgsPalLabeling::drawLabelBackground(), QgsAttributeTableFilterModel::generateListOfVisibleFeatures(), and QgsMapRenderer::render().

void QgsRenderContext::setPainter ( QPainter * p ) [inline]

Definition at line 90 of file qgsrendercontext.h.

Referenced by QgsPointPatternFillSymbolLayer::applyPattern(), QgsSymbolLayerV2Utils::createRenderContext(), QgsComposerMap::drawGridLine(), QgsPalLabeling::drawLabelBackground(), QgsComposerMap::drawOverviewMapExtent(), QgsMapRenderer::render(), and QgsMapCanvasItem::setRenderContextVariables().

void QgsRenderContext::setRasterScaleFactor ( double factor ) [inline]

Definition at line 88 of file qgsrendercontext.h.

Referenced by QgsPointPatternFillSymbolLayer::applyPattern(), QgsSymbolLayerV2Utils::createRenderContext(), QgsComposerMap::drawGridLine(), QgsComposerMap::drawOverviewMapExtent(), QgsMapRenderer::render(), and QgsMapCanvasItem::setRenderContextVariables().

void QgsRenderContext::setRendererScale ( double scale ) [inline]

Definition at line 89 of file qgsrendercontext.h.

Referenced by QgsRuleBasedRendererV2Widget::countFeatures(), QgsVectorLayer::countSymbolFeatures(), QgsAttributeTableFilterModel::generateListOfVisibleFeatures(), QgsMapRenderer::render(), QgsVectorFileWriter::renderContext(), and QgsMapCanvasItem::setRenderContextVariables().

void QgsRenderContext::setRenderingStopped ( bool stopped ) [inline]

Definition at line 86 of file qgsrendercontext.h.

Referenced by QgsComposerMap::draw(), QgsVectorLayer::onCacheImageDelete(), QgsMapCanvas::paintEvent(), QgsMapRenderer::render(), and QgsMapCanvas::setRenderFlag().

void QgsRenderContext::setScaleFactor ( double factor ) [inline]

Definition at line 87 of file qgsrendercontext.h.

Referenced by QgsPointPatternFillSymbolLayer::applyPattern(), QgsSymbolLayerV2Utils::createRenderContext(), QgsComposerMap::drawGridLine(), QgsPalLabeling::drawLabelBackground(), QgsComposerMap::drawOverviewMapExtent(), QgsMapRenderer::render(), and QgsMapCanvasItem::setRenderContextVariables().

void QgsRenderContext::setSelectionColor ( const QColor & color ) [inline]

Added in QGIS v2.0.

Definition at line 96 of file qgsrendercontext.h.

Referenced by QgsMapRenderer::render().

void QgsRenderContext::setUseAdvancedEffects ( bool enabled ) [inline]

Used to enable or disable advanced effects such as blend modes.

Note:: : added in version 1.9

Definition at line 67 of file qgsrendercontext.h.

Referenced by QgsComposerMap::draw().

bool QgsRenderContext::useAdvancedEffects ( ) const [inline]

Returns true if advanced effects such as blend modes such be used.

Note:: added in 1.9

Definition at line 64 of file qgsrendercontext.h.

Referenced by QgsPalLabeling::drawLabel(), QgsPalLabeling::drawLabelBackground(), QgsPalLabeling::drawLabelBuffer(), QgsPalLabeling::drawLabelShadow(), and QgsMapRenderer::render().

Member Data Documentation

const QgsCoordinateTransform* QgsRenderContext::mCoordTransform [private]

For transformation between coordinate systems.

Can be 0 if on-the-fly reprojection is not used

Definition at line 104 of file qgsrendercontext.h.

Referenced by setCoordinateTransform().

bool QgsRenderContext::mDrawEditingInformation [private]

True if vertex markers for editing should be drawn.

Definition at line 107 of file qgsrendercontext.h.

QgsRectangle QgsRenderContext::mExtent [private]

Definition at line 109 of file qgsrendercontext.h.

bool QgsRenderContext::mForceVectorOutput [private]

If true then no rendered vector elements should be cached as image.

Definition at line 112 of file qgsrendercontext.h.

QgsLabelingEngineInterface* QgsRenderContext::mLabelingEngine [private]

Labeling engine (can be NULL)

Definition at line 132 of file qgsrendercontext.h.

QgsMapToPixel QgsRenderContext::mMapToPixel [private]

Definition at line 117 of file qgsrendercontext.h.

QPainter* QgsRenderContext::mPainter [private]

Painter for rendering operations.

Definition at line 101 of file qgsrendercontext.h.

double QgsRenderContext::mRasterScaleFactor [private]

Factor to scale rasters.

Definition at line 126 of file qgsrendercontext.h.

double QgsRenderContext::mRendererScale [private]

Map scale.

Definition at line 129 of file qgsrendercontext.h.

bool QgsRenderContext::mRenderingStopped [private]

True if the rendering has been canceled.

Definition at line 120 of file qgsrendercontext.h.

double QgsRenderContext::mScaleFactor [private]

Factor to scale line widths and point marker sizes.

Definition at line 123 of file qgsrendercontext.h.

QColor QgsRenderContext::mSelectionColor [private]

Color used for features that are marked as selected.

Definition at line 135 of file qgsrendercontext.h.

bool QgsRenderContext::mUseAdvancedEffects [private]

Flag if advanced visual effects such as blend modes should be used.

True by default

Definition at line 115 of file qgsrendercontext.h.

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

src/core/qgsrendercontext.h
src/core/qgsrendercontext.cpp

Public Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation