Raster renderer pipe that applies colors to a raster. More...

#include <qgsrasterrenderer.h>

Inheritance diagram for QgsRasterRenderer:

[legend]

Public Member Functions
	QgsRasterRenderer (const QgsRasterRenderer &)=delete
	QgsRasterRenderer cannot be copied. Use clone() instead.

	QgsRasterRenderer (QgsRasterInterface *input=nullptr, const QString &type=QString())
	Constructor for QgsRasterRenderer.

	~QgsRasterRenderer () override

virtual bool	accept (QgsStyleEntityVisitorInterface *visitor) const
	Accepts the specified symbology visitor, causing it to visit all symbols associated with the renderer.

int	alphaBand () const

int	bandCount () const override
	Gets number of bands.

QgsRasterBlock *	block (int bandNo, const QgsRectangle &extent, int width, int height, QgsRasterBlockFeedback *feedback=nullptr) override=0
	Read block of data using given extent and size.

virtual bool	canCreateRasterAttributeTable () const
	Returns `true` if the renderer is suitable for attribute table creation.

QgsRasterRenderer *	clone () const override=0
	Clone itself, create deep copy.

void	copyCommonProperties (const QgsRasterRenderer *other, bool copyMinMaxOrigin=true)
	Copies common properties like opacity / transparency data from other renderer.

virtual QList< QgsLayerTreeModelLegendNode * >	createLegendNodes (QgsLayerTreeLayer *nodeLayer)
	Creates a set of legend nodes representing the renderer.

Qgis::DataType	dataType (int bandNo) const override
	Returns data type for the band specified by number.

virtual Qgis::RasterRendererFlags	flags () const
	Returns flags which dictate renderer behavior.

virtual int	inputBand () const
	Returns the input band for the renderer, or -1 if no input band is available.

virtual QList< QPair< QString, QColor > >	legendSymbologyItems () const
	Returns symbology items if provided by renderer.

const QgsRasterMinMaxOrigin &	minMaxOrigin () const
	Returns const reference to origin of min/max values.

QColor	nodataColor () const
	Returns the color to use for shading nodata pixels.

double	opacity () const
	Returns the opacity for the renderer, where opacity is a value between 0 (totally transparent) and 1.0 (fully opaque).

const QgsRasterRenderer &	operator= (const QgsRasterRenderer &)=delete
	QgsRasterRenderer cannot be copied. Use clone() instead.

const QgsRasterTransparency *	rasterTransparency () const

void	readXml (const QDomElement &rendererElem) override
	Sets base class members from xml. Usually called from create() methods of subclasses.

void	setAlphaBand (int band)

bool	setInput (QgsRasterInterface *input) override
	Set input.

virtual bool	setInputBand (int band)
	Attempts to set the input band for the renderer.

void	setMinMaxOrigin (const QgsRasterMinMaxOrigin &origin)
	Sets origin of min/max values.

void	setNodataColor (const QColor &color)
	Sets the color to use for shading nodata pixels.

void	setOpacity (double opacity)
	Sets the opacity for the renderer, where opacity is a value between 0 (totally transparent) and 1.0 (fully opaque).

void	setRasterTransparency (QgsRasterTransparency *t)

virtual void	toSld (QDomDocument &doc, QDomElement &element, const QVariantMap &props=QVariantMap()) const
	Used from subclasses to create SLD Rule elements following SLD v1.0 specs.

virtual QString	type () const
	Returns a unique string representation of the renderer type.

virtual QList< int >	usesBands () const
	Returns a list of band numbers used by the renderer.

bool	usesTransparency () const

Public Member Functions inherited from QgsRasterInterface
	QgsRasterInterface (QgsRasterInterface *input=nullptr)

virtual	~QgsRasterInterface ()=default

Q_DECL_DEPRECATED QgsRasterBandStats	bandStatistics (int bandNo, int stats, const QgsRectangle &extent=QgsRectangle(), int sampleSize=0, QgsRasterBlockFeedback *feedback=nullptr)
	Returns the band statistics.

virtual QgsRasterBandStats	bandStatistics (int bandNo, Qgis::RasterBandStatistics stats=Qgis::RasterBandStatistic::All, const QgsRectangle &extent=QgsRectangle(), int sampleSize=0, QgsRasterBlockFeedback *feedback=nullptr)
	Returns the band statistics.

virtual Qgis::RasterInterfaceCapabilities	capabilities () const
	Returns the capabilities supported by the interface.

Q_DECL_DEPRECATED QString	capabilitiesString () const
	Returns the raster interface capabilities in friendly format.

virtual QString	colorInterpretationName (int bandNumber) const
	Returns the name of the color interpretation for the specified bandNumber.

virtual void	cumulativeCut (int bandNo, double lowerCount, double upperCount, double &lowerValue, double &upperValue, const QgsRectangle &extent=QgsRectangle(), int sampleSize=0)
	Find values for cumulative pixel count cut.

int	dataTypeSize (int bandNo) const
	Returns the size (in bytes) for the data type for the specified band.

QString	displayBandName (int bandNumber) const
	Generates a friendly, descriptive name for the specified bandNumber.

virtual QgsRectangle	extent () const
	Gets the extent of the interface.

virtual QString	generateBandName (int bandNumber) const
	helper function to create zero padded band names

virtual bool	hasHistogram (int bandNo, int binCount, double minimum=std::numeric_limits< double >::quiet_NaN(), double maximum=std::numeric_limits< double >::quiet_NaN(), const QgsRectangle &extent=QgsRectangle(), int sampleSize=0, bool includeOutOfRange=false)
	Returns `true` if histogram is available (cached, already calculated)

Q_DECL_DEPRECATED bool	hasStatistics (int bandNo, int stats, const QgsRectangle &extent=QgsRectangle(), int sampleSize=0)
	Returns `true` if histogram is available (cached, already calculated).

virtual bool	hasStatistics (int bandNo, Qgis::RasterBandStatistics stats=Qgis::RasterBandStatistic::All, const QgsRectangle &extent=QgsRectangle(), int sampleSize=0)
	Returns `true` if histogram is available (cached, already calculated).

virtual QgsRasterHistogram	histogram (int bandNo, int binCount=0, double minimum=std::numeric_limits< double >::quiet_NaN(), double maximum=std::numeric_limits< double >::quiet_NaN(), const QgsRectangle &extent=QgsRectangle(), int sampleSize=0, bool includeOutOfRange=false, QgsRasterBlockFeedback *feedback=nullptr)
	Returns a band histogram.

virtual QgsRasterInterface *	input () const
	Current input.

virtual bool	on () const
	Returns whether the interface is on or off.

virtual void	setOn (bool on)
	Sets whether the interface is on or off.

virtual Qgis::DataType	sourceDataType (int bandNo) const
	Returns source data type for the band specified by number, source data type may be shorter than dataType.

virtual QgsRasterInterface *	sourceInput ()
	Gets source / raw input, the first in pipe, usually provider.

virtual const QgsRasterInterface *	sourceInput () const
	Gets source / raw input, the first in pipe, usually provider.

virtual void	writeXml (QDomDocument &doc, QDomElement &parentElem) const
	Write base class members to xml.

virtual int	xBlockSize () const
	Gets block size.

virtual int	xSize () const
	Gets raster size.

virtual int	yBlockSize () const

virtual int	ySize () const

Static Public Attributes
static const QRgb	NODATA_COLOR = qRgba( 0, 0, 0, 0 )

Protected Member Functions
void	_writeXml (QDomDocument &doc, QDomElement &rasterRendererElem) const
	Write upper class info into rasterrenderer element (called by writeXml method of subclasses)

QRgb	renderColorForNodataPixel () const
	Returns the color for the renderer to use to represent nodata pixels.

Protected Member Functions inherited from QgsRasterInterface
void	initHistogram (QgsRasterHistogram &histogram, int bandNo, int binCount, double minimum=std::numeric_limits< double >::quiet_NaN(), double maximum=std::numeric_limits< double >::quiet_NaN(), const QgsRectangle &boundingBox=QgsRectangle(), int sampleSize=0, bool includeOutOfRange=false)
	Fill in histogram defaults if not specified.

Q_DECL_DEPRECATED void	initStatistics (QgsRasterBandStats &statistics, int bandNo, int stats, const QgsRectangle &boundingBox=QgsRectangle(), int binCount=0) const
	Fill in statistics defaults if not specified.

void	initStatistics (QgsRasterBandStats &statistics, int bandNo, Qgis::RasterBandStatistics stats=Qgis::RasterBandStatistic::All, const QgsRectangle &boundingBox=QgsRectangle(), int binCount=0) const
	Fill in statistics defaults if not specified.

Protected Attributes
int	mAlphaBand = -1
	Read alpha value from band.

QgsRasterMinMaxOrigin	mMinMaxOrigin
	Origin of min/max values.

double	mOpacity = 1.0
	Global alpha value (0-1)

QgsRasterTransparency *	mRasterTransparency = nullptr
	Raster transparency per color or value. Overwrites global alpha value.

QString	mType

Protected Attributes inherited from QgsRasterInterface
QList< QgsRasterHistogram >	mHistograms
	List of cached histograms, all bands mixed.

QgsRasterInterface *	mInput = nullptr

bool	mOn = true

QList< QgsRasterBandStats >	mStatistics
	List of cached statistics, all bands mixed.

Detailed Description

Raster renderer pipe that applies colors to a raster.

Definition at line 40 of file qgsrasterrenderer.h.

Constructor & Destructor Documentation

◆ QgsRasterRenderer() [1/2]

QgsRasterRenderer::QgsRasterRenderer	(	QgsRasterInterface *	input = `nullptr`,
		const QString &	type = `QString()`
	)

Constructor for QgsRasterRenderer.

Definition at line 33 of file qgsrasterrenderer.cpp.

◆ ~QgsRasterRenderer()

QgsRasterRenderer::~QgsRasterRenderer ( )

override

Definition at line 39 of file qgsrasterrenderer.cpp.

◆ QgsRasterRenderer() [2/2]

QgsRasterRenderer::QgsRasterRenderer ( const QgsRasterRenderer & )

delete

QgsRasterRenderer cannot be copied. Use clone() instead.

Member Function Documentation

◆ _writeXml()

void QgsRasterRenderer::_writeXml	(	QDomDocument &	doc,
		QDomElement &	rasterRendererElem
	)		const

protected

Write upper class info into rasterrenderer element (called by writeXml method of subclasses)

Definition at line 158 of file qgsrasterrenderer.cpp.

◆ accept()

bool QgsRasterRenderer::accept ( QgsStyleEntityVisitorInterface * visitor ) const

virtual

Accepts the specified symbology visitor, causing it to visit all symbols associated with the renderer.

Returns true if the visitor should continue visiting other objects, or false if visiting should be canceled.

Since: QGIS 3.10

Reimplemented in QgsPalettedRasterRenderer, and QgsSingleBandPseudoColorRenderer.

Definition at line 243 of file qgsrasterrenderer.cpp.

◆ alphaBand()

int QgsRasterRenderer::alphaBand ( ) const

inline

Definition at line 165 of file qgsrasterrenderer.h.

◆ bandCount()

int QgsRasterRenderer::bandCount ( ) const

overridevirtual

Gets number of bands.

Implements QgsRasterInterface.

Definition at line 44 of file qgsrasterrenderer.cpp.

◆ block()

QgsRasterBlock * QgsRasterRenderer::block	(	int	bandNo,
		const QgsRectangle &	extent,
		int	width,
		int	height,
		QgsRasterBlockFeedback *	feedback = `nullptr`
	)

overridepure virtual

Read block of data using given extent and size.

Returns pointer to data. Caller is responsible to free the memory returned.

Parameters

bandNo	band number
extent	extent of block
width	pixel width of block
height	pixel height of block
feedback	optional raster feedback object for cancellation/preview. Added in QGIS 3.0.

Implements QgsRasterInterface.

Implemented in QgsHillshadeRenderer, QgsMultiBandColorRenderer, QgsPalettedRasterRenderer, QgsRasterContourRenderer, QgsRasterSingleColorRenderer, QgsSingleBandColorDataRenderer, QgsSingleBandGrayRenderer, and QgsSingleBandPseudoColorRenderer.

◆ canCreateRasterAttributeTable()

bool QgsRasterRenderer::canCreateRasterAttributeTable ( ) const

virtual

Returns true if the renderer is suitable for attribute table creation.

The default implementation returns false.

Since: QGIS 3.30

Reimplemented in QgsPalettedRasterRenderer, and QgsSingleBandPseudoColorRenderer.

Definition at line 69 of file qgsrasterrenderer.cpp.

◆ clone()

QgsRasterRenderer * QgsRasterRenderer::clone ( ) const

overridepure virtual

Clone itself, create deep copy.

Implements QgsRasterInterface.

Implemented in QgsHillshadeRenderer, QgsMultiBandColorRenderer, QgsPalettedRasterRenderer, QgsRasterContourRenderer, QgsRasterSingleColorRenderer, QgsSingleBandColorDataRenderer, QgsSingleBandGrayRenderer, and QgsSingleBandPseudoColorRenderer.

◆ copyCommonProperties()

void QgsRasterRenderer::copyCommonProperties	(	const QgsRasterRenderer *	other,
		bool	copyMinMaxOrigin = `true`
	)

Copies common properties like opacity / transparency data from other renderer.

Useful when cloning renderers.

Definition at line 216 of file qgsrasterrenderer.cpp.

◆ createLegendNodes()

QList< QgsLayerTreeModelLegendNode * > QgsRasterRenderer::createLegendNodes ( QgsLayerTreeLayer * nodeLayer )

virtual

Creates a set of legend nodes representing the renderer.

The default implementation calls legendSymbologyItems() and creates corresponding legend nodes for each returned symbology item.

Subclasses can override this to return more legend nodes which better represent the renderer.

Since: QGIS 3.18

Reimplemented in QgsMultiBandColorRenderer, QgsPalettedRasterRenderer, QgsRasterContourRenderer, QgsSingleBandGrayRenderer, and QgsSingleBandPseudoColorRenderer.

Definition at line 130 of file qgsrasterrenderer.cpp.

◆ dataType()

Qgis::DataType QgsRasterRenderer::dataType ( int bandNo ) const

overridevirtual

Returns data type for the band specified by number.

Implements QgsRasterInterface.

Definition at line 53 of file qgsrasterrenderer.cpp.

◆ flags()

Qgis::RasterRendererFlags QgsRasterRenderer::flags ( ) const

virtual

Returns flags which dictate renderer behavior.

Since: QGIS 3.28

Reimplemented in QgsHillshadeRenderer, QgsMultiBandColorRenderer, QgsPalettedRasterRenderer, QgsRasterContourRenderer, QgsRasterSingleColorRenderer, QgsSingleBandColorDataRenderer, QgsSingleBandGrayRenderer, and QgsSingleBandPseudoColorRenderer.

Definition at line 64 of file qgsrasterrenderer.cpp.

◆ inputBand()

int QgsRasterRenderer::inputBand ( ) const

virtual

Returns the input band for the renderer, or -1 if no input band is available.

For renderers which utilize multiple input bands -1 will be returned. In these cases usesBands() will return a list of all utilized bands (including alpha bands).

See also: setInputBand(); usesBands()

Since: QGIS 3.38

Reimplemented in QgsHillshadeRenderer, QgsPalettedRasterRenderer, QgsRasterContourRenderer, QgsRasterSingleColorRenderer, QgsSingleBandColorDataRenderer, QgsSingleBandGrayRenderer, and QgsSingleBandPseudoColorRenderer.

Definition at line 100 of file qgsrasterrenderer.cpp.

◆ legendSymbologyItems()

QList< QPair< QString, QColor > > QgsRasterRenderer::legendSymbologyItems ( ) const

virtual

Returns symbology items if provided by renderer.

See also: createLegendNodes()

Reimplemented in QgsPalettedRasterRenderer, QgsSingleBandGrayRenderer, and QgsSingleBandPseudoColorRenderer.

Definition at line 125 of file qgsrasterrenderer.cpp.

◆ minMaxOrigin()

const QgsRasterMinMaxOrigin & QgsRasterRenderer::minMaxOrigin ( ) const

inline

Returns const reference to origin of min/max values.

Definition at line 203 of file qgsrasterrenderer.h.

◆ nodataColor()

QColor QgsRasterRenderer::nodataColor ( ) const

inline

Returns the color to use for shading nodata pixels.

If the returned value is an invalid color then the default transparent rendering of nodata values will be used.

See also: renderColorForNodataPixel(); setNodataColor()

Since: QGIS 3.12

Definition at line 148 of file qgsrasterrenderer.h.

◆ opacity()

double QgsRasterRenderer::opacity ( ) const

inline

Returns the opacity for the renderer, where opacity is a value between 0 (totally transparent) and 1.0 (fully opaque).

See also: setOpacity()

Definition at line 136 of file qgsrasterrenderer.h.

◆ operator=()

const QgsRasterRenderer & QgsRasterRenderer::operator= ( const QgsRasterRenderer & )

delete

QgsRasterRenderer cannot be copied. Use clone() instead.

◆ rasterTransparency()

const QgsRasterTransparency * QgsRasterRenderer::rasterTransparency ( ) const

inline

Definition at line 162 of file qgsrasterrenderer.h.

◆ readXml()

void QgsRasterRenderer::readXml ( const QDomElement & rendererElem )

overridevirtual

Sets base class members from xml. Usually called from create() methods of subclasses.

Reimplemented from QgsRasterInterface.

Definition at line 188 of file qgsrasterrenderer.cpp.

◆ renderColorForNodataPixel()

QRgb QgsRasterRenderer::renderColorForNodataPixel ( ) const

protected

Returns the color for the renderer to use to represent nodata pixels.

Subclasses should use this rather then nodataColor() to determine the color to use for nodata pixels during an actual rendering operation.

Since: QGIS 3.10

Definition at line 180 of file qgsrasterrenderer.cpp.

◆ setAlphaBand()

void QgsRasterRenderer::setAlphaBand ( int band )

inline

Definition at line 164 of file qgsrasterrenderer.h.

◆ setInput()

bool QgsRasterRenderer::setInput ( QgsRasterInterface * input )

overridevirtual

Set input.

Returns true if set correctly, false if cannot use that input

Reimplemented from QgsRasterInterface.

Reimplemented in QgsSingleBandColorDataRenderer.

Definition at line 74 of file qgsrasterrenderer.cpp.

◆ setInputBand()

bool QgsRasterRenderer::setInputBand ( int band )

virtual

Attempts to set the input band for the renderer.

Returns true if the band was successfully set, or false if the band could not be set.

Note: Not all renderers support setting the input band.

See also: inputBand(); usesBands()

Since: QGIS 3.38

Reimplemented in QgsHillshadeRenderer, QgsPalettedRasterRenderer, QgsRasterContourRenderer, QgsRasterSingleColorRenderer, QgsSingleBandColorDataRenderer, QgsSingleBandGrayRenderer, and QgsSingleBandPseudoColorRenderer.

Definition at line 105 of file qgsrasterrenderer.cpp.

◆ setMinMaxOrigin()

void QgsRasterRenderer::setMinMaxOrigin ( const QgsRasterMinMaxOrigin & origin )

inline

Sets origin of min/max values.

Definition at line 206 of file qgsrasterrenderer.h.

◆ setNodataColor()

void QgsRasterRenderer::setNodataColor ( const QColor & color )

inline

Sets the color to use for shading nodata pixels.

If color is an invalid color then the default transparent rendering of nodata values will be used.

See also: nodataColor()

Since: QGIS 3.12

Definition at line 159 of file qgsrasterrenderer.h.

◆ setOpacity()

void QgsRasterRenderer::setOpacity ( double opacity )

inline

Sets the opacity for the renderer, where opacity is a value between 0 (totally transparent) and 1.0 (fully opaque).

See also: opacity()

Definition at line 129 of file qgsrasterrenderer.h.

◆ setRasterTransparency()

void QgsRasterRenderer::setRasterTransparency ( QgsRasterTransparency * t )

Definition at line 119 of file qgsrasterrenderer.cpp.

◆ toSld()

void QgsRasterRenderer::toSld	(	QDomDocument &	doc,
		QDomElement &	element,
		const QVariantMap &	props = `QVariantMap()`
	)		const

virtual

Used from subclasses to create SLD Rule elements following SLD v1.0 specs.

Since: QGIS 3.6

Reimplemented in QgsHillshadeRenderer, QgsMultiBandColorRenderer, QgsPalettedRasterRenderer, QgsSingleBandGrayRenderer, and QgsSingleBandPseudoColorRenderer.

Definition at line 229 of file qgsrasterrenderer.cpp.

◆ type()

virtual QString QgsRasterRenderer::type ( ) const

inlinevirtual

Returns a unique string representation of the renderer type.

Definition at line 69 of file qgsrasterrenderer.h.

◆ usesBands()

virtual QList< int > QgsRasterRenderer::usesBands ( ) const

inlinevirtual

Returns a list of band numbers used by the renderer.

See also: setInputBand()

Reimplemented in QgsHillshadeRenderer, QgsMultiBandColorRenderer, QgsPalettedRasterRenderer, QgsRasterContourRenderer, QgsRasterSingleColorRenderer, QgsSingleBandColorDataRenderer, QgsSingleBandGrayRenderer, and QgsSingleBandPseudoColorRenderer.

Definition at line 200 of file qgsrasterrenderer.h.

◆ usesTransparency()

bool QgsRasterRenderer::usesTransparency ( ) const

Definition at line 110 of file qgsrasterrenderer.cpp.

Member Data Documentation

◆ mAlphaBand

int QgsRasterRenderer::mAlphaBand = -1

protected

Read alpha value from band.

Is combined with value from raster transparency / global alpha value. Default: -1 (not set)

Definition at line 241 of file qgsrasterrenderer.h.

◆ mMinMaxOrigin

QgsRasterMinMaxOrigin QgsRasterRenderer::mMinMaxOrigin

protected

Origin of min/max values.

Definition at line 244 of file qgsrasterrenderer.h.

◆ mOpacity

double QgsRasterRenderer::mOpacity = 1.0

protected

Global alpha value (0-1)

Definition at line 233 of file qgsrasterrenderer.h.

◆ mRasterTransparency

QgsRasterTransparency* QgsRasterRenderer::mRasterTransparency = nullptr

protected

Raster transparency per color or value. Overwrites global alpha value.

Definition at line 235 of file qgsrasterrenderer.h.

◆ mType

QString QgsRasterRenderer::mType

protected

Definition at line 230 of file qgsrasterrenderer.h.

◆ NODATA_COLOR

const QRgb QgsRasterRenderer::NODATA_COLOR = qRgba( 0, 0, 0, 0 )

static

Definition at line 47 of file qgsrasterrenderer.h.

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

/build/qgis-3.41.0+git20241116+25ec5511245+99sid/src/core/raster/qgsrasterrenderer.h
/build/qgis-3.41.0+git20241116+25ec5511245+99sid/src/core/raster/qgsrasterrenderer.cpp

Public Member Functions

Static Public Attributes

Protected Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

◆ QgsRasterRenderer() [1/2]

◆ ~QgsRasterRenderer()

◆ QgsRasterRenderer() [2/2]

Member Function Documentation

◆ _writeXml()

◆ accept()

◆ alphaBand()

◆ bandCount()

◆ block()

◆ canCreateRasterAttributeTable()

◆ clone()

◆ copyCommonProperties()

◆ createLegendNodes()

◆ dataType()

◆ flags()

◆ inputBand()

◆ legendSymbologyItems()

◆ minMaxOrigin()

◆ nodataColor()

◆ opacity()

◆ operator=()

◆ rasterTransparency()

◆ readXml()

◆ renderColorForNodataPixel()

◆ setAlphaBand()

◆ setInput()

◆ setInputBand()

◆ setMinMaxOrigin()

◆ setNodataColor()

◆ setOpacity()

◆ setRasterTransparency()

◆ toSld()

◆ type()

◆ usesBands()

◆ usesTransparency()

Member Data Documentation

◆ mAlphaBand

◆ mMinMaxOrigin

◆ mOpacity

◆ mRasterTransparency

◆ mType

◆ NODATA_COLOR