Represents a raster layer. More...

#include <qgsrasterlayer.h>

Inheritance diagram for QgsRasterLayer:

[legend]

Classes
struct	LayerOptions
	Setting options for loading raster layers. More...

Public Slots
virtual void	setTransformContext (const QgsCoordinateTransformContext &transformContext) override
	Sets the coordinate transform context to transformContext.

void	showStatusMessage (const QString &message)

Public Slots inherited from QgsMapLayer
void	emitStyleChanged ()
	Triggers an emission of the styleChanged() signal.

QgsProject *	project () const
	Returns the parent project if this map layer is added to a project.

virtual bool	setDependencies (const QSet< QgsMapLayerDependency > &layers)
	Sets the list of dependencies.

void	setMaximumScale (double scale)
	Sets the maximum map scale (i.e.

void	setMinimumScale (double scale)
	Sets the minimum map scale (i.e.

void	setRefreshOnNofifyMessage (const QString &message)
	Set the notification message that triggers repaint If refresh on notification is enabled, the notification will triggerRepaint only if the notification message is equal to.

void	setRefreshOnNotifyEnabled (bool enabled)
	Set whether provider notification is connected to triggerRepaint.

void	setScaleBasedVisibility (bool enabled)
	Sets whether scale based visibility is enabled for the layer.

virtual void	setTransformContext (const QgsCoordinateTransformContext &transformContext)=0
	Sets the coordinate transform context to transformContext.

void	trigger3DUpdate ()
	Will advise any 3D maps that this layer requires to be updated in the scene.

void	triggerRepaint (bool deferredUpdate=false)
	Will advise the map canvas (and any other interested party) that this layer requires to be repainted.

Signals
void	subsetStringChanged ()
	Emitted when the layer's subset string has changed.

Signals inherited from QgsMapLayer
void	autoRefreshIntervalChanged (int interval)
	Emitted when the auto refresh interval changes.

void	beforeResolveReferences (QgsProject *project)
	Emitted when all layers are loaded and references can be resolved, just before the references of this layer are resolved.

void	blendModeChanged (QPainter::CompositionMode blendMode)
	Signal emitted when the blend mode is changed, through QgsMapLayer::setBlendMode()

void	configChanged ()
	Emitted whenever the configuration is changed.

void	crs3DChanged ()
	Emitted when the crs3D() of the layer has changed.

void	crsChanged ()
	Emitted when the crs() of the layer has changed.

void	customPropertyChanged (const QString &key)
	Emitted when a custom property of the layer has been changed or removed.

void	dataChanged ()
	Data of layer changed.

void	dataSourceChanged ()
	Emitted whenever the layer's data source has been changed.

void	dependenciesChanged ()
	Emitted when dependencies are changed.

void	editingStarted ()
	Emitted when editing on this layer has started.

void	editingStopped ()
	Emitted when edited changes have been successfully written to the data provider.

void	flagsChanged ()
	Emitted when layer's flags have been modified.

void	idChanged (const QString &id)
	Emitted when the layer's ID has been changed.

void	isValidChanged ()
	Emitted when the validity of this layer changed.

void	layerModified ()
	Emitted when modifications has been done on layer.

void	legendChanged ()
	Signal emitted when legend of the layer has changed.

void	mapTipsEnabledChanged ()
	Emitted when map tips are enabled or disabled for the layer.

void	mapTipTemplateChanged ()
	Emitted when the map tip template changes.

void	metadataChanged ()
	Emitted when the layer's metadata is changed.

void	nameChanged ()
	Emitted when the name has been changed.

void	opacityChanged (double opacity)
	Emitted when the layer's opacity is changed, where opacity is a value between 0 (transparent) and 1 (opaque).

void	recalculateExtents () const
	This is used to send a request that any mapcanvas using this layer update its extents.

void	renderer3DChanged ()
	Signal emitted when 3D renderer associated with the layer has changed.

void	rendererChanged ()
	Signal emitted when renderer is changed.

void	repaintRequested (bool deferredUpdate=false)
	By emitting this signal the layer tells that either appearance or content have been changed and any view showing the rendered layer should refresh itself.

void	request3DUpdate ()
	Signal emitted when a layer requires an update in any 3D maps.

void	statusChanged (const QString &status)
	Emit a signal with status (e.g. to be caught by QgisApp and display a msg on status bar)

void	styleChanged ()
	Signal emitted whenever a change affects the layer's style.

void	styleLoaded (QgsMapLayer::StyleCategories categories)
	Emitted when a style has been loaded.

void	verticalCrsChanged ()
	Emitted when the verticalCrs() of the layer has changed.

void	willBeDeleted ()
	Emitted in the destructor when the layer is about to be deleted, but it is still in a perfectly valid state: the last chance for other pieces of code for some cleanup if they use the layer.

Public Member Functions
	QgsRasterLayer ()
	Constructor. Provider is not set.

	QgsRasterLayer (const QString &uri, const QString &baseName=QString(), const QString &providerType="gdal", const QgsRasterLayer::LayerOptions &options=QgsRasterLayer::LayerOptions())
	This is the constructor for the RasterLayer class.

	~QgsRasterLayer () override

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

QgsRasterAttributeTable *	attributeTable (int bandNumber) const
	Returns the (possibly NULL) raster attribute table for the given band bandNumber.

int	attributeTableCount () const
	Returns the number of attribute tables for the raster by counting the number of bands that have an associated attribute table.

int	bandCount () const
	Returns the number of bands in this layer.

QString	bandName (int bandNoInt) const
	Returns the name of a band given its number.

QgsBrightnessContrastFilter *	brightnessFilter () const
	Returns the raster's brightness/contrast filter.

bool	canCreateRasterAttributeTable ()
	Returns `true` if the raster renderer is suitable for creation of a raster attribute table.

QgsRasterLayer *	clone () const override
	Returns a new instance equivalent to this one.

QgsMapLayerRenderer *	createMapRenderer (QgsRenderContext &rendererContext) override
	Returns new instance of QgsMapLayerRenderer that will be used for rendering of given context.

QgsAbstractProfileGenerator *	createProfileGenerator (const QgsProfileRequest &request) override
	Given a profile request, returns a new profile generator ready for generating elevation profiles.

const QgsRasterDataProvider *	dataProvider () const override
	Returns the source data provider.

QgsRasterDataProvider *	dataProvider () override
	Returns the source data provider.

bool	defaultContrastEnhancementSettings (QgsContrastEnhancement::ContrastEnhancementAlgorithm &myAlgorithm, QgsRasterMinMaxOrigin::Limits &myLimits) const
	Returns default contrast enhancement settings for that type of raster.

void	draw (QPainter theQPainter, QgsRasterViewPort myRasterViewPort, const QgsMapToPixel *qgsMapToPixel=nullptr)
	This is an overloaded version of the draw() function that is called by both draw() and thumbnailAsPixmap.

QgsMapLayerElevationProperties *	elevationProperties () override
	Returns the layer's elevation properties.

int	height () const
	Returns the height of the (unclipped) raster.

QString	htmlMetadata () const override
	Obtain a formatted HTML string containing assorted metadata for this layer.

QgsHueSaturationFilter *	hueSaturationFilter () const
	Returns the raster's hue/saturation filter.

bool	ignoreExtents () const
	If the ignoreExtent flag is set, the layer will also render outside the bounding box reported by the data provider.

bool	isSpatial () const override
	Returns `true` if the layer is considered a spatial layer, ie it has some form of geometry associated with it.

Q_DECL_DEPRECATED QgsLegendColorList	legendSymbologyItems () const
	Returns a list with classification items (Text and color).

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

QPixmap	paletteAsPixmap (int bandNumber=1)
	Returns a 100x100 pixmap of the color palette.

QgsRasterPipe *	pipe ()
	Returns the raster pipe.

QImage	previewAsImage (QSize size, const QColor &bgColor=Qt::white, QImage::Format format=QImage::Format_ARGB32_Premultiplied)
	Draws a preview of the rasterlayer into a QImage.

Qgis::MapLayerProperties	properties () const override
	Returns the map layer properties of this layer.

QString	providerType () const
	[ data provider interface ] Which provider is being used for this Raster Layer?

Qgis::RasterLayerType	rasterType () const
	Returns the raster layer type (which is a read only property).

double	rasterUnitsPerPixelX () const
	Returns the number of raster units per each raster pixel in X axis.

double	rasterUnitsPerPixelY () const
	Returns the number of raster units per each raster pixel in Y axis.

void	refreshContrastEnhancement (const QgsRectangle &extent)
	Refresh contrast enhancement with new extent.

void	refreshRendererIfNeeded (QgsRasterRenderer *rasterRenderer, const QgsRectangle &extent)
	Refresh renderer with new extent, if needed.

void	reload () override
	Synchronises with changes in the datasource.

QgsRasterRenderer *	renderer () const
	Returns the raster's renderer.

QgsRasterResampleFilter *	resampleFilter () const
	Returns the raster's resample filter.

Qgis::RasterResamplingStage	resamplingStage () const
	Returns which stage of the pipe should apply resampling.

void	setContrastEnhancement (QgsContrastEnhancement::ContrastEnhancementAlgorithm algorithm, QgsRasterMinMaxOrigin::Limits limits=QgsRasterMinMaxOrigin::MinMax, const QgsRectangle &extent=QgsRectangle(), int sampleSize=QgsRasterLayer::SAMPLE_SIZE, bool generateLookupTableFlag=true)
	Set contrast enhancement algorithm.

Q_DECL_DEPRECATED void	setDataProvider (const QString &provider)
	Set the data provider.

void	setDataProvider (const QString &provider, const QgsDataProvider::ProviderOptions &options, Qgis::DataProviderReadFlags flags=Qgis::DataProviderReadFlags())
	Set the data provider.

void	setDefaultContrastEnhancement ()
	Sets the default contrast enhancement.

void	setLayerOrder (const QStringList &layers) override
	Reorders the previously selected sublayers of this layer from bottom to top.

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

void	setRenderer (QgsRasterRenderer *renderer)
	Sets the raster's renderer.

void	setResamplingStage (Qgis::RasterResamplingStage stage)
	Select which stage of the pipe should apply resampling.

void	setSubLayerVisibility (const QString &name, bool vis) override
	Set the visibility of the given sublayer name.

virtual bool	setSubsetString (const QString &subset)
	Sets the string (typically sql) used to define a subset of the layer.

QStringList	subLayers () const override
	Returns the sublayers of this layer.

virtual QString	subsetString () const
	Returns the string (typically sql) used to define a subset of the layer.

QgsMapLayerTemporalProperties *	temporalProperties () override
	Returns the layer's temporal properties.

QDateTime	timestamp () const override
	Time stamp of data source in the moment when data/metadata were loaded by provider.

int	width () const
	Returns the width of the (unclipped) raster.

bool	writeSld (QDomNode &node, QDomDocument &doc, QString &errorMessage, const QVariantMap &props=QVariantMap()) const
	Writes the symbology of the layer into the document provided in SLD 1.0.0 format.

Public Member Functions inherited from QgsMapLayer
	QgsMapLayer (const QgsMapLayer &)=delete

	QgsMapLayer (Qgis::LayerType type=Qgis::LayerType::Vector, const QString &name=QString(), const QString &source=QString())
	Constructor for QgsMapLayer.

	~QgsMapLayer () override

Q_DECL_DEPRECATED QString	abstract () const
	Returns the abstract of the layer used by QGIS Server in GetCapabilities request.

Q_DECL_DEPRECATED QString	attribution () const
	Returns the attribution of the layer used by QGIS Server in GetCapabilities request.

Q_DECL_DEPRECATED QString	attributionUrl () const
	Returns the attribution URL of the layer used by QGIS Server in GetCapabilities request.

int	autoRefreshInterval () const
	Returns the auto refresh interval (in milliseconds).

Qgis::AutoRefreshMode	autoRefreshMode () const
	Returns the layer's automatic refresh mode.

QPainter::CompositionMode	blendMode () const
	Returns the current blending mode for a layer.

QgsCoordinateReferenceSystem	crs () const
	Returns the layer's spatial reference system.

QgsCoordinateReferenceSystem	crs3D () const
	Returns the CRS to use for the layer when transforming 3D data, or when z/elevation value handling is important.

template<class T >
T	customEnumProperty (const QString &key, const T &defaultValue)
	Returns the property value for a property based on an enum.

template<class T >
T	customFlagProperty (const QString &key, const T &defaultValue)
	Returns the property value for a property based on a flag.

const QgsObjectCustomProperties &	customProperties () const
	Read all custom properties from layer.

Q_INVOKABLE QVariant	customProperty (const QString &value, const QVariant &defaultValue=QVariant()) const
	Read a custom property from layer.

Q_INVOKABLE QStringList	customPropertyKeys () const
	Returns list of all keys within custom properties.

Q_DECL_DEPRECATED QString	dataUrl () const
	Returns the DataUrl of the layer used by QGIS Server in GetCapabilities request.

Q_DECL_DEPRECATED QString	dataUrlFormat () const
	Returns the DataUrl format of the layer used by QGIS Server in GetCapabilities request.

virtual bool	deleteStyleFromDatabase (const QString &styleId, QString &msgError)
	Deletes a style from the database.

virtual QSet< QgsMapLayerDependency >	dependencies () const
	Gets the list of dependencies.

virtual QgsError	error () const
	Gets current status error.

void	exportNamedMetadata (QDomDocument &doc, QString &errorMsg) const
	Export the current metadata of this layer as named metadata in a QDomDocument.

virtual void	exportNamedStyle (QDomDocument &doc, QString &errorMsg, const QgsReadWriteContext &context=QgsReadWriteContext(), QgsMapLayer::StyleCategories categories=QgsMapLayer::AllStyleCategories) const
	Export the properties of this layer as named style in a QDomDocument.

virtual void	exportSldStyle (QDomDocument &doc, QString &errorMsg) const
	Export the properties of this layer as SLD style in a QDomDocument.

virtual void	exportSldStyleV2 (QDomDocument &doc, QString &errorMsg, const QgsSldExportContext &exportContext) const
	Export the properties of this layer as SLD style in a QDomDocument.

virtual QgsRectangle	extent () const
	Returns the extent of the layer.

virtual QgsBox3D	extent3D () const
	Returns the 3D extent of the layer.

QgsMapLayer::LayerFlags	flags () const
	Returns the flags for this layer.

virtual QString	getStyleFromDatabase (const QString &styleId, QString &msgError)
	Returns the named style corresponding to style id provided.

Q_DECL_DEPRECATED bool	hasAutoRefreshEnabled () const
	Returns `true` if auto refresh is enabled for the layer.

virtual bool	hasMapTips () const
	Returns `true` if the layer contains map tips.

bool	hasScaleBasedVisibility () const
	Returns whether scale based visibility is enabled for the layer.

QString	id () const
	Returns the layer's unique ID, which is used to access this layer from QgsProject.

bool	importNamedMetadata (QDomDocument &document, QString &errorMessage)
	Import the metadata of this layer from a QDomDocument.

virtual bool	importNamedStyle (QDomDocument &doc, QString &errorMsg, QgsMapLayer::StyleCategories categories=QgsMapLayer::AllStyleCategories)
	Import the properties of this layer from a QDomDocument.

virtual bool	isEditable () const
	Returns `true` if the layer can be edited.

bool	isInScaleRange (double scale) const
	Tests whether the layer should be visible at the specified scale.

virtual bool	isModified () const
	Returns `true` if the layer has been modified since last commit/save.

bool	isRefreshOnNotifyEnabled () const
	Returns `true` if the refresh on provider nofification is enabled.

virtual bool	isTemporary () const
	Returns `true` if the layer is considered a temporary layer.

bool	isValid () const
	Returns the status of the layer.

Q_DECL_DEPRECATED QString	keywordList () const
	Returns the keyword list of the layer used by QGIS Server in GetCapabilities request.

QgsMapLayerLegend *	legend () const
	Can be `nullptr`.

QString	legendPlaceholderImage () const
	Returns path to the placeholder image or an empty string if a generated legend is shown.

QString	legendUrl () const
	Returns the URL for the layer's legend.

QString	legendUrlFormat () const
	Returns the format for a URL based layer legend.

virtual int	listStylesInDatabase (QStringList &ids, QStringList &names, QStringList &descriptions, QString &msgError)
	Lists all the style in db split into related to the layer and not related to.

virtual QString	loadDefaultMetadata (bool &resultFlag)
	Retrieve the default metadata for this layer if one exists (either as a .qmd file on disk or as a record in the users metadata table in their personal qgis.db)

virtual QString	loadDefaultStyle (bool &resultFlag)
	Retrieve the default style for this layer if one exists (either as a .qml file on disk or as a record in the users style table in their personal qgis.db)

virtual QString	loadNamedMetadata (const QString &uri, bool &resultFlag)
	Retrieve a named metadata for this layer if one exists (either as a .qmd file on disk or as a record in the users style table in their personal qgis.db)

bool	loadNamedMetadataFromDatabase (const QString &db, const QString &uri, QString &qmd)
	Retrieve a named metadata for this layer from a sqlite database.

virtual QString	loadNamedStyle (const QString &theURI, bool &resultFlag, bool loadFromLocalDb, QgsMapLayer::StyleCategories categories=QgsMapLayer::AllStyleCategories, Qgis::LoadStyleFlags flags=Qgis::LoadStyleFlags())
	Loads a named style from file/local db/datasource db.

virtual QString	loadNamedStyle (const QString &uri, bool &resultFlag, QgsMapLayer::StyleCategories categories=QgsMapLayer::AllStyleCategories, Qgis::LoadStyleFlags flags=Qgis::LoadStyleFlags())
	Retrieve a named style for this layer if one exists (either as a .qml file on disk or as a record in the users style table in their personal qgis.db)

virtual bool	loadNamedStyleFromDatabase (const QString &db, const QString &uri, QString &qml)
	Retrieve a named style for this layer from a sqlite database.

virtual QString	loadSldStyle (const QString &uri, bool &resultFlag)
	Attempts to style the layer using the formatting from an SLD type file.

bool	mapTipsEnabled () const
	Returns true if map tips are enabled for this layer.

QString	mapTipTemplate () const
	The mapTip is a pretty, html representation for feature information.

double	maximumScale () const
	Returns the maximum map scale (i.e.

virtual const QgsLayerMetadata &	metadata () const
	Returns a reference to the layer's metadata store.

virtual QString	metadataUri () const
	Retrieve the metadata URI for this layer (either as a .qmd file on disk or as a record in the users style table in their personal qgis.db)

Q_DECL_DEPRECATED QString	metadataUrl () const
	Returns the metadata URL of the layer used by QGIS Server in GetCapabilities request.

Q_DECL_DEPRECATED QString	metadataUrlFormat () const
	Returns the metadata format of the layer used by QGIS Server in GetCapabilities request.

Q_DECL_DEPRECATED QString	metadataUrlType () const
	Returns the metadata type of the layer used by QGIS Server in GetCapabilities request.

double	minimumScale () const
	Returns the minimum map scale (i.e.

QString	name () const
	Returns the display name of the layer.

QgsMapLayer &	operator= (const QgsMapLayer &)=delete

QString	originalXmlProperties () const
	Returns the XML properties of the original layer as they were when the layer was first read from the project file.

QgsProviderMetadata *	providerMetadata () const
	Returns the layer data provider's metadata, it may be `nullptr`.

QString	providerType () const
	Returns the provider type (provider key) for this layer.

QString	publicSource (bool hidePassword=false) const
	Gets a version of the internal layer definition that has sensitive bits removed (for example, the password).

bool	readLayerXml (const QDomElement &layerElement, QgsReadWriteContext &context, QgsMapLayer::ReadFlags flags=QgsMapLayer::ReadFlags(), QgsDataProvider *preloadedProvider=nullptr)
	Sets state from DOM document.

bool	readOnly () const
	Returns if this layer is read only.

virtual bool	readSld (const QDomNode &node, QString &errorMessage)

QString	refreshOnNotifyMessage () const
	Returns the message that should be notified by the provider to triggerRepaint.

void	removeCustomProperty (const QString &key)
	Remove a custom property from layer.

QgsAbstract3DRenderer *	renderer3D () const
	Returns 3D renderer associated with the layer.

virtual void	resolveReferences (QgsProject *project)
	Resolve references to other layers (kept as layer IDs after reading XML) into layer objects.

virtual QString	saveDefaultMetadata (bool &resultFlag)
	Save the current metadata of this layer as the default metadata (either as a .qmd file on disk or as a record in the users style table in their personal qgis.db)

virtual Q_DECL_DEPRECATED QString	saveDefaultStyle (bool &resultFlag)
	Save the properties of this layer as the default style (either as a .qml file on disk or as a record in the users style table in their personal qgis.db)

virtual QString	saveDefaultStyle (bool &resultFlag, StyleCategories categories)
	Save the properties of this layer as the default style (either as a .qml file on disk or as a record in the users style table in their personal qgis.db)

QString	saveNamedMetadata (const QString &uri, bool &resultFlag)
	Save the current metadata of this layer as a named metadata (either as a .qmd file on disk or as a record in the users style table in their personal qgis.db)

virtual QString	saveNamedStyle (const QString &uri, bool &resultFlag, StyleCategories categories=AllStyleCategories)
	Save the properties of this layer as a named style (either as a .qml file on disk or as a record in the users style table in their personal qgis.db)

virtual QString	saveSldStyle (const QString &uri, bool &resultFlag) const
	Saves the properties of this layer to an SLD format file.

virtual QString	saveSldStyleV2 (bool &resultFlag, const QgsSldExportContext &exportContext) const
	Saves the properties of this layer to an SLD format file.

virtual void	saveStyleToDatabase (const QString &name, const QString &description, bool useAsDefault, const QString &uiFileContent, QString &msgError, QgsMapLayer::StyleCategories categories=QgsMapLayer::AllStyleCategories)
	Saves named and sld style of the layer to the style table in the db.

virtual QgsMapLayerSelectionProperties *	selectionProperties ()
	Returns the layer's selection properties.

QgsMapLayerServerProperties *	serverProperties ()
	Returns QGIS Server Properties for the map layer.

const QgsMapLayerServerProperties *	serverProperties () const
	Returns QGIS Server Properties const for the map layer.

Q_DECL_DEPRECATED void	setAbstract (const QString &abstract)
	Sets the abstract of the layer used by QGIS Server in GetCapabilities request.

Q_DECL_DEPRECATED void	setAttribution (const QString &attrib)
	Sets the attribution of the layerused by QGIS Server in GetCapabilities request.

Q_DECL_DEPRECATED void	setAttributionUrl (const QString &attribUrl)
	Sets the attribution URL of the layer used by QGIS Server in GetCapabilities request.

Q_DECL_DEPRECATED void	setAutoRefreshEnabled (bool enabled)
	Sets whether auto refresh is enabled for the layer.

void	setAutoRefreshInterval (int interval)
	Sets the auto refresh interval (in milliseconds) for the layer.

void	setAutoRefreshMode (Qgis::AutoRefreshMode mode)
	Sets the automatic refresh mode for the layer.

void	setBlendMode (QPainter::CompositionMode blendMode)
	Set the blending mode used for rendering a layer.

void	setCrs (const QgsCoordinateReferenceSystem &srs, bool emitSignal=true)
	Sets layer's spatial reference system.

template<class T >
void	setCustomEnumProperty (const QString &key, const T &value)
	Set the value of a property based on an enum.

template<class T >
void	setCustomFlagProperty (const QString &key, const T &value)
	Set the value of a property based on a flag.

void	setCustomProperties (const QgsObjectCustomProperties &properties)
	Set custom properties for layer.

Q_INVOKABLE void	setCustomProperty (const QString &key, const QVariant &value)
	Set a custom property for layer.

void	setDataSource (const QString &dataSource, const QString &baseName, const QString &provider, const QgsDataProvider::ProviderOptions &options, bool loadDefaultStyleFlag=false)
	Updates the data source of the layer.

void	setDataSource (const QString &dataSource, const QString &baseName, const QString &provider, const QgsDataProvider::ProviderOptions &options, Qgis::DataProviderReadFlags flags)
	Updates the data source of the layer.

void	setDataSource (const QString &dataSource, const QString &baseName=QString(), const QString &provider=QString(), bool loadDefaultStyleFlag=false)
	Updates the data source of the layer.

Q_DECL_DEPRECATED void	setDataUrl (const QString &dataUrl)
	Sets the DataUrl of the layer used by QGIS Server in GetCapabilities request.

Q_DECL_DEPRECATED void	setDataUrlFormat (const QString &dataUrlFormat)
	Sets the DataUrl format of the layer used by QGIS Server in GetCapabilities request.

void	setFlags (QgsMapLayer::LayerFlags flags)
	Returns the flags for this layer.

bool	setId (const QString &id)
	Sets the layer's id.

Q_DECL_DEPRECATED void	setKeywordList (const QString &keywords)
	Sets the keyword list of the layerused by QGIS Server in GetCapabilities request.

void	setLegend (QgsMapLayerLegend *legend)
	Assign a legend controller to the map layer.

void	setLegendPlaceholderImage (const QString &imgPath)
	Set placeholder image for legend.

void	setLegendUrl (const QString &legendUrl)
	Sets the URL for the layer's legend.

void	setLegendUrlFormat (const QString &legendUrlFormat)
	Sets the format for a URL based layer legend.

void	setMapTipsEnabled (bool enabled)
	Enable or disable map tips for this layer.

void	setMapTipTemplate (const QString &mapTipTemplate)
	The mapTip is a pretty, html representation for feature information.

virtual void	setMetadata (const QgsLayerMetadata &metadata)
	Sets the layer's metadata store.

Q_DECL_DEPRECATED void	setMetadataUrl (const QString &metaUrl)
	Sets the metadata URL of the layer used by QGIS Server in GetCapabilities request.

Q_DECL_DEPRECATED void	setMetadataUrlFormat (const QString &metaUrlFormat)
	Sets the metadata format of the layer used by QGIS Server in GetCapabilities request.

Q_DECL_DEPRECATED void	setMetadataUrlType (const QString &metaUrlType)
	Set the metadata type of the layer used by QGIS Server in GetCapabilities request MetadataUrlType indicates the standard to which the metadata complies.

void	setName (const QString &name)
	Set the display name of the layer.

void	setOriginalXmlProperties (const QString &originalXmlProperties)
	Sets the original XML properties for the layer to originalXmlProperties.

void	setRenderer3D (QgsAbstract3DRenderer *renderer)
	Sets 3D renderer for the layer.

Q_DECL_DEPRECATED void	setShortName (const QString &shortName)
	Sets the short name of the layer used by QGIS Server to identify the layer.

Q_DECL_DEPRECATED void	setTitle (const QString &title)
	Sets the title of the layer used by QGIS Server in GetCapabilities request.

bool	setVerticalCrs (const QgsCoordinateReferenceSystem &crs, QString *errorMessage=nullptr)
	Sets the layer's vertical coordinate reference system.

Q_DECL_DEPRECATED QString	shortName () const
	Returns the short name of the layer used by QGIS Server to identify the layer.

QString	source () const
	Returns the source for the layer.

QgsMapLayerStyleManager *	styleManager () const
	Gets access to the layer's style manager.

virtual QString	styleURI () const
	Retrieve the style URI for this layer (either as a .qml file on disk or as a record in the users style table in their personal qgis.db)

virtual bool	supportsEditing () const
	Returns whether the layer supports editing or not.

Q_DECL_DEPRECATED QString	title () const
	Returns the title of the layer used by QGIS Server in GetCapabilities request.

QgsCoordinateTransformContext	transformContext () const
	Returns the layer data provider coordinate transform context or a default transform context if the layer does not have a valid data provider.

Qgis::LayerType	type () const
	Returns the type of the layer.

QUndoStack *	undoStack ()
	Returns pointer to layer's undo stack.

QUndoStack *	undoStackStyles ()
	Returns pointer to layer's style undo stack.

QgsCoordinateReferenceSystem	verticalCrs () const
	Returns the layer's vertical coordinate reference system.

QgsRectangle	wgs84Extent (bool forceRecalculate=false) const
	Returns the WGS84 extent (EPSG:4326) of the layer according to ReadFlag::FlagTrustLayerMetadata.

bool	writeLayerXml (QDomElement &layerElement, QDomDocument &document, const QgsReadWriteContext &context) const
	Stores state in DOM node.

Public Member Functions inherited from QgsAbstractProfileSource
virtual	~QgsAbstractProfileSource ()

Static Public Member Functions
static bool	isValidRasterFileName (const QString &fileNameQString)

static bool	isValidRasterFileName (const QString &fileNameQString, QString &retError)
	This helper checks to see whether the file name appears to be a valid raster file name.

static QDateTime	lastModified (const QString &name)
	Returns time stamp for given file name.

Static Public Member Functions inherited from QgsMapLayer
static QString	extensionPropertyType (PropertyType type)
	Returns the extension of a Property.

static QString	formatLayerName (const QString &name)
	A convenience function to capitalize and format a layer name.

static QString	generateId (const QString &layerName)
	Generates an unique identifier for this layer, the generate ID is prefixed by layerName.

static Qgis::DataProviderReadFlags	providerReadFlags (const QDomNode &layerNode, QgsMapLayer::ReadFlags layerReadFlags)
	Returns provider read flag deduced from layer read flags layerReadFlags and a dom node layerNode that describes a layer (corresponding to `maplayer` tag in a DOM document project file read by QgsProject).

Static Public Attributes
static const QgsContrastEnhancement::ContrastEnhancementAlgorithm	MULTIPLE_BAND_MULTI_BYTE_ENHANCEMENT_ALGORITHM = QgsContrastEnhancement::StretchToMinimumMaximum
	Default enhancement algorithm for multiple band raster of type different from Byte.

static const QgsRasterMinMaxOrigin::Limits	MULTIPLE_BAND_MULTI_BYTE_MIN_MAX_LIMITS = QgsRasterMinMaxOrigin::CumulativeCut
	Default enhancement limits for multiple band raster of type different from Byte.

static const QgsContrastEnhancement::ContrastEnhancementAlgorithm	MULTIPLE_BAND_SINGLE_BYTE_ENHANCEMENT_ALGORITHM = QgsContrastEnhancement::NoEnhancement
	Default enhancement algorithm for multiple band raster of type Byte.

static const QgsRasterMinMaxOrigin::Limits	MULTIPLE_BAND_SINGLE_BYTE_MIN_MAX_LIMITS = QgsRasterMinMaxOrigin::MinMax
	Default enhancement limits for multiple band raster of type Byte.

static const double	SAMPLE_SIZE = 250000
	Default sample size (number of pixels) for estimated statistics/histogram calculation.

static const QgsSettingsEntryBool *	settingsRasterDefaultEarlyResampling = new QgsSettingsEntryBool( QStringLiteral( "default-early-resampling" ), QgsSettingsTree::sTreeRaster, false )

static const QgsSettingsEntryDouble *	settingsRasterDefaultOversampling = new QgsSettingsEntryDouble( QStringLiteral( "default-oversampling" ), QgsSettingsTree::sTreeRaster, 2.0 )

static const QgsContrastEnhancement::ContrastEnhancementAlgorithm	SINGLE_BAND_ENHANCEMENT_ALGORITHM = QgsContrastEnhancement::StretchToMinimumMaximum
	Default enhancement algorithm for single band raster.

static const QgsRasterMinMaxOrigin::Limits	SINGLE_BAND_MIN_MAX_LIMITS = QgsRasterMinMaxOrigin::MinMax
	Default enhancement limits for single band raster.

Protected Member Functions
QString	decodedSource (const QString &source, const QString &provider, const QgsReadWriteContext &context) const override
	Called by readLayerXML(), used by derived classes to decode provider's specific data source from project files.

QString	encodedSource (const QString &source, const QgsReadWriteContext &context) const override
	Called by writeLayerXML(), used by derived classes to encode provider's specific data source to project files.

bool	readStyle (const QDomNode &node, QString &errorMessage, QgsReadWriteContext &context, QgsMapLayer::StyleCategories categories=QgsMapLayer::AllStyleCategories) override
	Read the style for the current layer from the DOM node supplied.

bool	readSymbology (const QDomNode &node, QString &errorMessage, QgsReadWriteContext &context, QgsMapLayer::StyleCategories categories=QgsMapLayer::AllStyleCategories) override
	Read the symbology for the current layer from the DOM node supplied.

bool	readXml (const QDomNode &layer_node, QgsReadWriteContext &context) override
	Called by readLayerXML(), used by children to read state specific to them from project files.

bool	writeStyle (QDomNode &node, QDomDocument &doc, QString &errorMessage, const QgsReadWriteContext &context, QgsMapLayer::StyleCategories categories=QgsMapLayer::AllStyleCategories) const override
	Write just the symbology information for the layer into the document.

bool	writeSymbology (QDomNode &, QDomDocument &doc, QString &errorMessage, const QgsReadWriteContext &context, QgsMapLayer::StyleCategories categories=QgsMapLayer::AllStyleCategories) const override
	Write the style for the layer into the document provided.

bool	writeXml (QDomNode &layer_node, QDomDocument &doc, const QgsReadWriteContext &context) const override
	Called by writeLayerXML(), used by children to write state specific to them to project files.

Protected Member Functions inherited from QgsMapLayer
void	appendError (const QgsErrorMessage &error)
	Add error message.

void	clone (QgsMapLayer *layer) const
	Copies attributes like name, short name, ... into another layer.

QString	crsHtmlMetadata () const
	Returns a HTML fragment containing the layer's CRS metadata, for use in the htmlMetadata() method.

QString	customPropertyHtmlMetadata () const
	Returns an HTML fragment containing custom property information, for use in the htmlMetadata() method.

QString	generalHtmlMetadata () const
	Returns an HTML fragment containing general metadata information, for use in the htmlMetadata() method.

Q_DECL_DEPRECATED bool	hasDependencyCycle (const QSet< QgsMapLayerDependency > &) const
	Checks whether a new set of dependencies will introduce a cycle this method is now deprecated and always return `false`, because circular dependencies are now correctly managed.

void	invalidateWgs84Extent ()
	Invalidates the WGS84 extent.

void	readCommonStyle (const QDomElement &layerElement, const QgsReadWriteContext &context, StyleCategories categories=AllStyleCategories)
	Read style data common to all layer types.

void	readCustomProperties (const QDomNode &layerNode, const QString &keyStartsWith=QString())
	Read custom properties from project file.

void	readStyleManager (const QDomNode &layerNode)
	Read style manager's configuration (if any). To be called by subclasses.

void	setError (const QgsError &error)
	Sets error message.

virtual void	setExtent (const QgsRectangle &rect)
	Sets the extent.

virtual void	setExtent3D (const QgsBox3D &box)
	Sets the extent.

void	setProviderType (const QString &providerType)
	Sets the providerType (provider key)

void	setValid (bool valid)
	Sets whether layer is valid or not.

void	writeCommonStyle (QDomElement &layerElement, QDomDocument &document, const QgsReadWriteContext &context, StyleCategories categories=AllStyleCategories) const
	Write style data common to all layer types.

void	writeCustomProperties (QDomNode &layerNode, QDomDocument &doc) const
	Write custom properties to project file.

void	writeStyleManager (QDomNode &layerNode, QDomDocument &doc) const
	Write style manager's configuration (if exists). To be called by subclasses.

Additional Inherited Members
Public Types inherited from QgsMapLayer
enum	LayerFlag { Identifiable = 1 << 0 , Removable = 1 << 1 , Searchable = 1 << 2 , Private = 1 << 3 }
	Flags for the map layer. More...

typedef QFlags< LayerFlag >	LayerFlags

enum	PropertyType { Style = 0 , Metadata }
	Maplayer has a style and a metadata property. More...

enum	ReadFlag { FlagDontResolveLayers = 1 << 0 , FlagTrustLayerMetadata = 1 << 1 , FlagReadExtentFromXml = 1 << 2 , FlagForceReadOnly = 1 << 3 }
	Flags which control project read behavior. More...

typedef QFlags< ReadFlag >	ReadFlags

typedef QFlags< StyleCategory >	StyleCategories

enum	StyleCategory { LayerConfiguration = 1 << 0 , Symbology = 1 << 1 , Symbology3D = 1 << 2 , Labeling = 1 << 3 , Fields = 1 << 4 , Forms = 1 << 5 , Actions = 1 << 6 , MapTips = 1 << 7 , Diagrams = 1 << 8 , AttributeTable = 1 << 9 , Rendering = 1 << 10 , CustomProperties = 1 << 11 , GeometryOptions = 1 << 12 , Relations = 1 << 13 , Temporal = 1 << 14 , Legend = 1 << 15 , Elevation = 1 << 16 , Notes = 1 << 17 , AllStyleCategories }
	Categories of style to distinguish appropriate sections for import/export. More...

Protected Attributes inherited from QgsMapLayer
int	mBlockStyleChangedSignal = 0
	If non-zero, the styleChanged signal should not be emitted.

QString	mDataSource
	Data source description string, varies by layer type.

QSet< QgsMapLayerDependency >	mDependencies
	List of layers that may modify this layer on modification.

QgsError	mError
	Error.

bool	mIsRefreshOnNofifyEnabled = false

QString	mLayerName
	Name of the layer - used for display.

double	mLayerOpacity = 1.0
	Layer opacity.

QString	mLegendUrl
	WMS legend.

QString	mLegendUrlFormat

std::unique_ptr< QgsDataProvider >	mPreloadedProvider
	Optionally used when loading a project, it is released when the layer is effectively created.

QString	mProviderKey
	Data provider key (name of the data provider)

QgsMapLayer::ReadFlags	mReadFlags = QgsMapLayer::ReadFlags()
	Read flags. It's up to the subclass to respect these when restoring state from XML.

QString	mRefreshOnNofifyMessage

bool	mShouldValidateCrs = true
	`true` if the layer's CRS should be validated and invalid CRSes are not permitted.

bool	mValid = false
	Indicates if the layer is valid and can be drawn.

Properties inherited from QgsMapLayer
int	autoRefreshInterval

QgsCoordinateReferenceSystem	crs

QgsCoordinateReferenceSystem	crs3D

QString	id

bool	isValid

bool	mapTipsEnabled

QString	mapTipTemplate

QgsLayerMetadata	metadata

QString	name

double	opacity

Qgis::LayerType	type

QgsCoordinateReferenceSystem	verticalCrs

Detailed Description

Represents a raster layer.

A QgsRasterLayer is instantiated by specifying the name of a data provider, such as "gdal" or "wms", and a url defining the specific data set to connect to. The raster layer constructor in turn instantiates a QgsRasterDataProvider subclass corresponding to the provider type, and passes it the url. The data provider connects to the data source.

Sample usage of the QgsRasterLayer class:

my_raster_layer = QgsRasterLayer("/path/to/file.tif", "my layer")

QgsRasterLayer

Represents a raster layer.

Definition qgsrasterlayer.h:78

Definition at line 77 of file qgsrasterlayer.h.

Constructor & Destructor Documentation

◆ QgsRasterLayer() [1/2]

QgsRasterLayer::QgsRasterLayer ( )

Constructor. Provider is not set.

Definition at line 110 of file qgsrasterlayer.cpp.

◆ QgsRasterLayer() [2/2]

QgsRasterLayer::QgsRasterLayer	(	const QString &	uri,
		const QString &	baseName = `QString()`,
		const QString &	providerType = `"gdal"`,
		const QgsRasterLayer::LayerOptions &	options = `QgsRasterLayer::LayerOptions()`
	)

explicit

This is the constructor for the RasterLayer class.

The main tasks carried out by the constructor are:

Load the rasters default style (.qml) file if it exists
Populate the RasterStatsVector with initial values for each band.
Calculate the layer extents
Determine whether the layer is gray, paletted or multiband.
Assign sensible defaults for the red, green, blue and gray bands.

Definition at line 122 of file qgsrasterlayer.cpp.

◆ ~QgsRasterLayer()

QgsRasterLayer::~QgsRasterLayer ( )

override

Definition at line 155 of file qgsrasterlayer.cpp.

Member Function Documentation

◆ accept()

bool QgsRasterLayer::accept ( QgsStyleEntityVisitorInterface * visitor ) const

overridevirtual

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

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

Since: QGIS 3.10

Reimplemented from QgsMapLayer.

Definition at line 1814 of file qgsrasterlayer.cpp.

◆ attributeTable()

QgsRasterAttributeTable * QgsRasterLayer::attributeTable ( int bandNumber ) const

Returns the (possibly NULL) raster attribute table for the given band bandNumber.

Since: QGIS 3.30

Definition at line 274 of file qgsrasterlayer.cpp.

◆ attributeTableCount()

int QgsRasterLayer::attributeTableCount ( ) const

Returns the number of attribute tables for the raster by counting the number of bands that have an associated attribute table.

Since: QGIS 3.30

Definition at line 283 of file qgsrasterlayer.cpp.

◆ bandCount()

int QgsRasterLayer::bandCount ( ) const

Returns the number of bands in this layer.

Definition at line 258 of file qgsrasterlayer.cpp.

◆ bandName()

QString QgsRasterLayer::bandName ( int bandNoInt ) const

Returns the name of a band given its number.

Definition at line 266 of file qgsrasterlayer.cpp.

◆ brightnessFilter()

QgsBrightnessContrastFilter * QgsRasterLayer::brightnessFilter ( ) const

Returns the raster's brightness/contrast filter.

See also: resampleFilter(); hueSaturationFilter()

Definition at line 2067 of file qgsrasterlayer.cpp.

◆ canCreateRasterAttributeTable()

bool QgsRasterLayer::canCreateRasterAttributeTable ( )

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

The supported renderers are QgsPalettedRasterRenderer and QgsSingleBandPseudoColorRenderer.

Since: QGIS 3.30

Definition at line 301 of file qgsrasterlayer.cpp.

◆ clone()

QgsRasterLayer * QgsRasterLayer::clone ( ) const

overridevirtual

Returns a new instance equivalent to this one.

A new provider is created for the same data source and renderer is cloned too.

Returns: a new layer instance

Implements QgsMapLayer.

Definition at line 163 of file qgsrasterlayer.cpp.

◆ createMapRenderer()

QgsMapLayerRenderer * QgsRasterLayer::createMapRenderer ( QgsRenderContext & rendererContext )

overridevirtual

Returns new instance of QgsMapLayerRenderer that will be used for rendering of given context.

Implements QgsMapLayer.

Definition at line 339 of file qgsrasterlayer.cpp.

◆ createProfileGenerator()

QgsAbstractProfileGenerator * QgsRasterLayer::createProfileGenerator ( const QgsProfileRequest & request )

overridevirtual

Given a profile request, returns a new profile generator ready for generating elevation profiles.

The caller takes ownership of the returned generator.

May return nullptr if the source cannot generate a profile at this time.

Implements QgsAbstractProfileSource.

Definition at line 196 of file qgsrasterlayer.cpp.

◆ dataProvider() [1/2]

const QgsRasterDataProvider * QgsRasterLayer::dataProvider ( ) const

overridevirtual

Returns the source data provider.

This will be nullptr if the layer is invalid.

Reimplemented from QgsMapLayer.

Definition at line 322 of file qgsrasterlayer.cpp.

◆ dataProvider() [2/2]

QgsRasterDataProvider * QgsRasterLayer::dataProvider ( )

overridevirtual

Returns the source data provider.

This will be nullptr if the layer is invalid.

Reimplemented from QgsMapLayer.

Definition at line 315 of file qgsrasterlayer.cpp.

◆ decodedSource()

QString QgsRasterLayer::decodedSource	(	const QString &	source,
		const QString &	dataProvider,
		const QgsReadWriteContext &	context
	)		const

overrideprotectedvirtual

Called by readLayerXML(), used by derived classes to decode provider's specific data source from project files.

Typically resolving absolute or relative paths, usernames and passwords or drivers prefixes ("HDF5:")

Parameters

source	data source to decode, typically read from layer's DOM element "datasource"
dataProvider	string identification of data provider (e.g. "ogr"), typically read from layer's DOM element
context	reading context (e.g. for conversion between relative and absolute paths)

Returns: decoded source, typically to be used as the layer's datasource

Since: QGIS 3.2

Reimplemented from QgsMapLayer.

Definition at line 2642 of file qgsrasterlayer.cpp.

◆ defaultContrastEnhancementSettings()

bool QgsRasterLayer::defaultContrastEnhancementSettings	(	QgsContrastEnhancement::ContrastEnhancementAlgorithm &	myAlgorithm,
		QgsRasterMinMaxOrigin::Limits &	myLimits
	)		const

Returns default contrast enhancement settings for that type of raster.

Note: not available in Python bindings

Definition at line 1705 of file qgsrasterlayer.cpp.

◆ draw()

void QgsRasterLayer::draw	(	QPainter *	theQPainter,
		QgsRasterViewPort *	myRasterViewPort,
		const QgsMapToPixel *	qgsMapToPixel = `nullptr`
	)

This is an overloaded version of the draw() function that is called by both draw() and thumbnailAsPixmap.

Definition at line 347 of file qgsrasterlayer.cpp.

◆ elevationProperties()

QgsMapLayerElevationProperties * QgsRasterLayer::elevationProperties ( )

overridevirtual

Returns the layer's elevation properties.

This may be nullptr, depending on the layer type.

Since: QGIS 3.18

Reimplemented from QgsMapLayer.

Definition at line 1330 of file qgsrasterlayer.cpp.

◆ encodedSource()

QString QgsRasterLayer::encodedSource	(	const QString &	source,
		const QgsReadWriteContext &	context
	)		const

overrideprotectedvirtual

Called by writeLayerXML(), used by derived classes to encode provider's specific data source to project files.

Typically resolving absolute or relative paths, usernames and passwords or drivers prefixes ("HDF5:")

Parameters

source	data source to encode, typically QgsMapLayer::source()
context	writing context (e.g. for conversion between relative and absolute paths)

Returns: encoded source, typically to be written in the DOM element "datasource"

Since: QGIS 3.2

Reimplemented from QgsMapLayer.

Definition at line 2635 of file qgsrasterlayer.cpp.

◆ height()

int QgsRasterLayer::height ( ) const

Returns the height of the (unclipped) raster.

See also: width()

Definition at line 2657 of file qgsrasterlayer.cpp.

◆ htmlMetadata()

QString QgsRasterLayer::htmlMetadata ( ) const

overridevirtual

Obtain a formatted HTML string containing assorted metadata for this layer.

Reimplemented from QgsMapLayer.

Definition at line 404 of file qgsrasterlayer.cpp.

◆ hueSaturationFilter()

QgsHueSaturationFilter * QgsRasterLayer::hueSaturationFilter ( ) const

Returns the raster's hue/saturation filter.

See also: resampleFilter(); brightnessFilter()

Definition at line 2074 of file qgsrasterlayer.cpp.

◆ ignoreExtents()

bool QgsRasterLayer::ignoreExtents ( ) const

If the ignoreExtent flag is set, the layer will also render outside the bounding box reported by the data provider.

To be used for example for WMS layers with labels or symbology that happens to be drawn outside the data extent.

Since: QGIS 3.10

Definition at line 1316 of file qgsrasterlayer.cpp.

◆ isSpatial()

bool QgsRasterLayer::isSpatial ( ) const

inlineoverridevirtual

Returns true if the layer is considered a spatial layer, ie it has some form of geometry associated with it.

Reimplemented from QgsMapLayer.

Definition at line 350 of file qgsrasterlayer.h.

◆ isValidRasterFileName() [1/2]

bool QgsRasterLayer::isValidRasterFileName ( const QString & fileNameQString )

static

Definition at line 218 of file qgsrasterlayer.cpp.

◆ isValidRasterFileName() [2/2]

bool QgsRasterLayer::isValidRasterFileName	(	const QString &	fileNameQString,
		QString &	retError
	)

static

This helper checks to see whether the file name appears to be a valid raster file name.

If the file name looks like it could be valid, but some sort of error occurs in processing the file, the error is returned in retError.

Definition at line 212 of file qgsrasterlayer.cpp.

◆ lastModified()

QDateTime QgsRasterLayer::lastModified ( const QString & name )

static

Returns time stamp for given file name.

Definition at line 224 of file qgsrasterlayer.cpp.

◆ legendSymbologyItems()

QgsLegendColorList QgsRasterLayer::legendSymbologyItems ( ) const

Returns a list with classification items (Text and color).

Deprecated:: QGIS 3.40. Use QgsRasterRenderer::createLegendNodes() instead.

Definition at line 396 of file qgsrasterlayer.cpp.

◆ opacity()

double QgsRasterLayer::opacity ( ) const

virtual

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

See also: setOpacity(); opacityChanged()

Note: Prior to QGIS 3.18, this method was available for vector layers only

Since: QGIS 3.18

Reimplemented from QgsMapLayer.

Definition at line 689 of file qgsrasterlayer.cpp.

◆ paletteAsPixmap()

QPixmap QgsRasterLayer::paletteAsPixmap ( int bandNumber = 1 )

Returns a 100x100 pixmap of the color palette.

If the layer has no palette a white pixmap will be returned

Parameters

bandNumber the number of the band to use for generating a pixmap of the associated palette

Definition at line 583 of file qgsrasterlayer.cpp.

◆ pipe()

QgsRasterPipe * QgsRasterLayer::pipe ( )

inline

Returns the raster pipe.

Definition at line 279 of file qgsrasterlayer.h.

◆ previewAsImage()

QImage QgsRasterLayer::previewAsImage	(	QSize	size,
		const QColor &	bgColor = `Qt::white`,
		QImage::Format	format = `QImage::Format_ARGB32_Premultiplied`
	)

Draws a preview of the rasterlayer into a QImage.

Definition at line 2112 of file qgsrasterlayer.cpp.

◆ properties()

Qgis::MapLayerProperties QgsRasterLayer::properties ( ) const

overridevirtual

Returns the map layer properties of this layer.

Note: properties() differ from flags() in that flags() are user settable, and reflect options that users can enable for map layers. In contrast properties() are reflections of inherent capabilities for the layer, which cannot be directly changed by users.

Since: QGIS 3.22

Reimplemented from QgsMapLayer.

Definition at line 571 of file qgsrasterlayer.cpp.

◆ providerType()

QString QgsRasterLayer::providerType ( ) const

[ data provider interface ] Which provider is being used for this Raster Layer?

Definition at line 640 of file qgsrasterlayer.cpp.

◆ rasterType()

Qgis::RasterLayerType QgsRasterLayer::rasterType ( ) const

inline

Returns the raster layer type (which is a read only property).

Definition at line 219 of file qgsrasterlayer.h.

◆ rasterUnitsPerPixelX()

double QgsRasterLayer::rasterUnitsPerPixelX ( ) const

Returns the number of raster units per each raster pixel in X axis.

In a world file, this is normally the first row (without the sign). (E.g. the value reported by the GDAL geotransform[1]).

See also: rasterUnitsPerPixelY()

Definition at line 647 of file qgsrasterlayer.cpp.

◆ rasterUnitsPerPixelY()

double QgsRasterLayer::rasterUnitsPerPixelY ( ) const

Returns the number of raster units per each raster pixel in Y axis.

In a world file, this is normally the first row (without the sign).

See also: rasterUnitsPerPixelX()

Definition at line 665 of file qgsrasterlayer.cpp.

◆ readStyle()

bool QgsRasterLayer::readStyle	(	const QDomNode &	node,
		QString &	errorMessage,
		QgsReadWriteContext &	context,
		QgsMapLayer::StyleCategories	categories = `QgsMapLayer::AllStyleCategories`
	)

overrideprotectedvirtual

Read the style for the current layer from the DOM node supplied.

Parameters

node	node that will contain the style definition for this layer.
errorMessage	reference to string that will be updated with any error messages
context	reading context (used for transform from relative to absolute paths)
categories	the style categories to be read

Returns: true in case of success.

Note: To be implemented in subclasses. Default implementation does nothing and returns false.

Reimplemented from QgsMapLayer.

Definition at line 2313 of file qgsrasterlayer.cpp.

◆ readSymbology()

bool QgsRasterLayer::readSymbology	(	const QDomNode &	node,
		QString &	errorMessage,
		QgsReadWriteContext &	context,
		QgsMapLayer::StyleCategories	categories = `QgsMapLayer::AllStyleCategories`
	)

overrideprotectedvirtual

Read the symbology for the current layer from the DOM node supplied.

Parameters

node	node that will contain the symbology definition for this layer.
errorMessage	reference to string that will be updated with any error messages
context	reading context (used for transform from relative to absolute paths)
categories	the style categories to be read

Returns: true in case of success.

Implements QgsMapLayer.

Definition at line 2173 of file qgsrasterlayer.cpp.

◆ readXml()

bool QgsRasterLayer::readXml	(	const QDomNode &	layer_node,
		QgsReadWriteContext &	context
	)

overrideprotectedvirtual

Called by readLayerXML(), used by children to read state specific to them from project files.

Reimplemented from QgsMapLayer.

Definition at line 2320 of file qgsrasterlayer.cpp.

◆ refreshContrastEnhancement()

void QgsRasterLayer::refreshContrastEnhancement ( const QgsRectangle & extent )

Refresh contrast enhancement with new extent.

Note: not available in Python bindings

Definition at line 1503 of file qgsrasterlayer.cpp.

◆ refreshRendererIfNeeded()

void QgsRasterLayer::refreshRendererIfNeeded	(	QgsRasterRenderer *	rasterRenderer,
		const QgsRectangle &	extent
	)

Refresh renderer with new extent, if needed.

Note: not available in Python bindings

Definition at line 1546 of file qgsrasterlayer.cpp.

◆ reload()

void QgsRasterLayer::reload ( )

overridevirtual

Synchronises with changes in the datasource.

Reimplemented from QgsMapLayer.

Definition at line 329 of file qgsrasterlayer.cpp.

◆ renderer()

QgsRasterRenderer * QgsRasterLayer::renderer ( ) const

Returns the raster's renderer.

See also: setRenderer()

Definition at line 2053 of file qgsrasterlayer.cpp.

◆ resampleFilter()

QgsRasterResampleFilter * QgsRasterLayer::resampleFilter ( ) const

Returns the raster's resample filter.

See also: brightnessFilter(); hueSaturationFilter()

Definition at line 2060 of file qgsrasterlayer.cpp.

◆ resamplingStage()

Qgis::RasterResamplingStage QgsRasterLayer::resamplingStage ( ) const

Returns which stage of the pipe should apply resampling.

See also: QgsRasterPipe::resamplingStage()

Since: QGIS 3.16

Definition at line 2672 of file qgsrasterlayer.cpp.

◆ setContrastEnhancement()

void QgsRasterLayer::setContrastEnhancement	(	QgsContrastEnhancement::ContrastEnhancementAlgorithm	algorithm,
		QgsRasterMinMaxOrigin::Limits	limits = `QgsRasterMinMaxOrigin::MinMax`,
		const QgsRectangle &	extent = `QgsRectangle()`,
		int	sampleSize = `QgsRasterLayer::SAMPLE_SIZE`,
		bool	generateLookupTableFlag = `true`
	)

Set contrast enhancement algorithm.

Parameters

algorithm	Contrast enhancement algorithm
limits	Limits
extent	Extent used to calculate limits, if empty, use full layer extent
sampleSize	Size of data sample to calculate limits, if 0, use full resolution
generateLookupTableFlag	Generate lookup table.

Definition at line 1337 of file qgsrasterlayer.cpp.

◆ setDataProvider() [1/2]

void QgsRasterLayer::setDataProvider ( const QString & provider )

Set the data provider.

Deprecated:: QGIS 3.40. Use the version with ProviderOptions instead.

Definition at line 242 of file qgsrasterlayer.cpp.

◆ setDataProvider() [2/2]

void QgsRasterLayer::setDataProvider	(	const QString &	provider,
		const QgsDataProvider::ProviderOptions &	options,
		Qgis::DataProviderReadFlags	flags = `Qgis::DataProviderReadFlags()`
	)

Set the data provider.

Parameters

provider	provider key string, must match a valid QgsRasterDataProvider key. E.g. "gdal", "wms", etc.
options	provider options
flags	provider flags since QGIS 3.16

Since: QGIS 3.2

Definition at line 711 of file qgsrasterlayer.cpp.

◆ setDefaultContrastEnhancement()

void QgsRasterLayer::setDefaultContrastEnhancement ( )

Sets the default contrast enhancement.

Definition at line 1767 of file qgsrasterlayer.cpp.

◆ setLayerOrder()

void QgsRasterLayer::setLayerOrder ( const QStringList & layers )

overridevirtual

Reorders the previously selected sublayers of this layer from bottom to top.

(Useful for providers that manage their own layers, such as WMS).

Reimplemented from QgsMapLayer.

Definition at line 1780 of file qgsrasterlayer.cpp.

◆ setOpacity()

void QgsRasterLayer::setOpacity ( double opacity )

virtual

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

See also: opacity(); opacityChanged()

Note: Prior to QGIS 3.18, this method was available for vector layers only

Since: QGIS 3.18

Reimplemented from QgsMapLayer.

Definition at line 677 of file qgsrasterlayer.cpp.

◆ setRenderer()

void QgsRasterLayer::setRenderer ( QgsRasterRenderer * renderer )

Sets the raster's renderer.

Takes ownership of the renderer object.

See also: renderer()

Definition at line 2038 of file qgsrasterlayer.cpp.

◆ setResamplingStage()

void QgsRasterLayer::setResamplingStage ( Qgis::RasterResamplingStage stage )

Select which stage of the pipe should apply resampling.

See also: QgsRasterPipe::setResamplingStage()

Since: QGIS 3.16

Definition at line 2665 of file qgsrasterlayer.cpp.

◆ setSubLayerVisibility()

void QgsRasterLayer::setSubLayerVisibility	(	const QString &	name,
		bool	visible
	)

overridevirtual

Set the visibility of the given sublayer name.

Parameters

name	sublayer name
visible	sublayer visibility

Reimplemented from QgsMapLayer.

Definition at line 1794 of file qgsrasterlayer.cpp.

◆ setSubsetString()

bool QgsRasterLayer::setSubsetString ( const QString & subset )

virtual

Sets the string (typically sql) used to define a subset of the layer.

Parameters

subset The subset string. This may be the where clause of a sql statement or other definition string specific to the underlying dataprovider and data store.

Returns: true, when setting the subset string was successful, false otherwise

Since: QGIS 3.12

Definition at line 1671 of file qgsrasterlayer.cpp.

◆ setTransformContext

void QgsRasterLayer::setTransformContext ( const QgsCoordinateTransformContext & transformContext )

overridevirtualslot

Sets the coordinate transform context to transformContext.

Since: QGIS 3.8

Definition at line 2092 of file qgsrasterlayer.cpp.

◆ showStatusMessage

void QgsRasterLayer::showStatusMessage ( const QString & message )

slot

Definition at line 2081 of file qgsrasterlayer.cpp.

◆ subLayers()

QStringList QgsRasterLayer::subLayers ( ) const

overridevirtual

Returns the sublayers of this layer.

(Useful for providers that manage their own layers, such as WMS).

Reimplemented from QgsMapLayer.

Definition at line 2101 of file qgsrasterlayer.cpp.

◆ subsetString()

QString QgsRasterLayer::subsetString ( ) const

virtual

Returns the string (typically sql) used to define a subset of the layer.

Returns: The subset string or null QString if not implemented by the provider

Since: QGIS 3.12

Definition at line 1655 of file qgsrasterlayer.cpp.

◆ subsetStringChanged

void QgsRasterLayer::subsetStringChanged ( )

signal

Emitted when the layer's subset string has changed.

Since: QGIS 3.12

◆ temporalProperties()

QgsMapLayerTemporalProperties * QgsRasterLayer::temporalProperties ( )

overridevirtual

Returns the layer's temporal properties.

This may be nullptr, depending on the layer type.

Since: QGIS 3.14

Reimplemented from QgsMapLayer.

Definition at line 1323 of file qgsrasterlayer.cpp.

◆ timestamp()

QDateTime QgsRasterLayer::timestamp ( ) const

overridevirtual

Time stamp of data source in the moment when data/metadata were loaded by provider.

Reimplemented from QgsMapLayer.

Definition at line 1805 of file qgsrasterlayer.cpp.

◆ width()

int QgsRasterLayer::width ( ) const

Returns the width of the (unclipped) raster.

See also: height()

Definition at line 2649 of file qgsrasterlayer.cpp.

◆ writeSld()

bool QgsRasterLayer::writeSld	(	QDomNode &	node,
		QDomDocument &	doc,
		QString &	errorMessage,
		const QVariantMap &	props = `QVariantMap()`
	)		const

Writes the symbology of the layer into the document provided in SLD 1.0.0 format.

Parameters

node	the node that will have the style element added to it.
doc	the document that will have the QDomNode added.
errorMessage	reference to string that will be updated with any error messages
props	a open ended set of properties that can drive/inform the SLD encoding

Returns: true in case of success

Since: QGIS 3.6

Definition at line 1827 of file qgsrasterlayer.cpp.

◆ writeStyle()

bool QgsRasterLayer::writeStyle	(	QDomNode &	node,
		QDomDocument &	doc,
		QString &	errorMessage,
		const QgsReadWriteContext &	context,
		QgsMapLayer::StyleCategories	categories = `QgsMapLayer::AllStyleCategories`
	)		const

overrideprotectedvirtual

Write just the symbology information for the layer into the document.

Parameters

node	the node that will have the style element added to it.
doc	the document that will have the QDomNode added.
errorMessage	reference to string that will be updated with any error messages
context	writing context (used for transform from absolute to relative paths)
categories	the style categories to be written

Returns: true in case of success.

Note: To be implemented in subclasses. Default implementation does nothing and returns false.; There is a confusion of terms with the GUI. This method actually writes what is known as the symbology in the application.

Reimplemented from QgsMapLayer.

Definition at line 2559 of file qgsrasterlayer.cpp.

◆ writeSymbology()

bool QgsRasterLayer::writeSymbology	(	QDomNode &	node,
		QDomDocument &	doc,
		QString &	errorMessage,
		const QgsReadWriteContext &	context,
		QgsMapLayer::StyleCategories	categories = `QgsMapLayer::AllStyleCategories`
	)		const

overrideprotectedvirtual

Write the style for the layer into the document provided.

Parameters

node	the node that will have the style element added to it.
doc	the document that will have the QDomNode added.
errorMessage	reference to string that will be updated with any error messages
context	writing context (used for transform from absolute to relative paths)
categories	the style categories to be written

Note: There is a confusion of terms with the GUI. This method actually writes what is called a style in the application.

Returns: true in case of success.

Implements QgsMapLayer.

Definition at line 2489 of file qgsrasterlayer.cpp.

◆ writeXml()

bool QgsRasterLayer::writeXml	(	QDomNode &	layer_node,
		QDomDocument &	document,
		const QgsReadWriteContext &	context
	)		const

overrideprotectedvirtual

Called by writeLayerXML(), used by children to write state specific to them to project files.

Reimplemented from QgsMapLayer.

Definition at line 2567 of file qgsrasterlayer.cpp.

Member Data Documentation

◆ MULTIPLE_BAND_MULTI_BYTE_ENHANCEMENT_ALGORITHM

const QgsContrastEnhancement::ContrastEnhancementAlgorithm QgsRasterLayer::MULTIPLE_BAND_MULTI_BYTE_ENHANCEMENT_ALGORITHM = QgsContrastEnhancement::StretchToMinimumMaximum

static

Default enhancement algorithm for multiple band raster of type different from Byte.

Definition at line 96 of file qgsrasterlayer.h.

◆ MULTIPLE_BAND_MULTI_BYTE_MIN_MAX_LIMITS

const QgsRasterMinMaxOrigin::Limits QgsRasterLayer::MULTIPLE_BAND_MULTI_BYTE_MIN_MAX_LIMITS = QgsRasterMinMaxOrigin::CumulativeCut

static

Default enhancement limits for multiple band raster of type different from Byte.

Definition at line 105 of file qgsrasterlayer.h.

◆ MULTIPLE_BAND_SINGLE_BYTE_ENHANCEMENT_ALGORITHM

const QgsContrastEnhancement::ContrastEnhancementAlgorithm QgsRasterLayer::MULTIPLE_BAND_SINGLE_BYTE_ENHANCEMENT_ALGORITHM = QgsContrastEnhancement::NoEnhancement

static

Default enhancement algorithm for multiple band raster of type Byte.

Definition at line 93 of file qgsrasterlayer.h.

◆ MULTIPLE_BAND_SINGLE_BYTE_MIN_MAX_LIMITS

const QgsRasterMinMaxOrigin::Limits QgsRasterLayer::MULTIPLE_BAND_SINGLE_BYTE_MIN_MAX_LIMITS = QgsRasterMinMaxOrigin::MinMax

static

Default enhancement limits for multiple band raster of type Byte.

Definition at line 102 of file qgsrasterlayer.h.

◆ SAMPLE_SIZE

const double QgsRasterLayer::SAMPLE_SIZE = 250000

static

Default sample size (number of pixels) for estimated statistics/histogram calculation.

Definition at line 87 of file qgsrasterlayer.h.

◆ settingsRasterDefaultEarlyResampling

const QgsSettingsEntryBool * QgsRasterLayer::settingsRasterDefaultEarlyResampling = new QgsSettingsEntryBool( QStringLiteral( "default-early-resampling" ), QgsSettingsTree::sTreeRaster, false )

static

Definition at line 83 of file qgsrasterlayer.h.

◆ settingsRasterDefaultOversampling

const QgsSettingsEntryDouble * QgsRasterLayer::settingsRasterDefaultOversampling = new QgsSettingsEntryDouble( QStringLiteral( "default-oversampling" ), QgsSettingsTree::sTreeRaster, 2.0 )

static

Definition at line 84 of file qgsrasterlayer.h.

◆ SINGLE_BAND_ENHANCEMENT_ALGORITHM

const QgsContrastEnhancement::ContrastEnhancementAlgorithm QgsRasterLayer::SINGLE_BAND_ENHANCEMENT_ALGORITHM = QgsContrastEnhancement::StretchToMinimumMaximum

static

Default enhancement algorithm for single band raster.

Definition at line 90 of file qgsrasterlayer.h.

◆ SINGLE_BAND_MIN_MAX_LIMITS

const QgsRasterMinMaxOrigin::Limits QgsRasterLayer::SINGLE_BAND_MIN_MAX_LIMITS = QgsRasterMinMaxOrigin::MinMax

static

Default enhancement limits for single band raster.

Definition at line 99 of file qgsrasterlayer.h.

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

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

Classes

Public Slots

Signals

Public Member Functions

Static Public Member Functions

Static Public Attributes

Protected Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ QgsRasterLayer() [1/2]

◆ QgsRasterLayer() [2/2]

◆ ~QgsRasterLayer()

Member Function Documentation

◆ accept()

◆ attributeTable()

◆ attributeTableCount()

◆ bandCount()

◆ bandName()

◆ brightnessFilter()

◆ canCreateRasterAttributeTable()

◆ clone()

◆ createMapRenderer()

◆ createProfileGenerator()

◆ dataProvider() [1/2]

◆ dataProvider() [2/2]

◆ decodedSource()

◆ defaultContrastEnhancementSettings()

◆ draw()

◆ elevationProperties()

◆ encodedSource()

◆ height()

◆ htmlMetadata()

◆ hueSaturationFilter()

◆ ignoreExtents()

◆ isSpatial()

◆ isValidRasterFileName() [1/2]

◆ isValidRasterFileName() [2/2]

◆ lastModified()

◆ legendSymbologyItems()

◆ opacity()

◆ paletteAsPixmap()

◆ pipe()

◆ previewAsImage()

◆ properties()

◆ providerType()

◆ rasterType()

◆ rasterUnitsPerPixelX()

◆ rasterUnitsPerPixelY()

◆ readStyle()

◆ readSymbology()

◆ readXml()

◆ refreshContrastEnhancement()

◆ refreshRendererIfNeeded()

◆ reload()

◆ renderer()

◆ resampleFilter()

◆ resamplingStage()

◆ setContrastEnhancement()

◆ setDataProvider() [1/2]

◆ setDataProvider() [2/2]

◆ setDefaultContrastEnhancement()

◆ setLayerOrder()

◆ setOpacity()

◆ setRenderer()

◆ setResamplingStage()

◆ setSubLayerVisibility()

◆ setSubsetString()

◆ setTransformContext

◆ showStatusMessage

◆ subLayers()

◆ subsetString()

◆ subsetStringChanged

◆ temporalProperties()

◆ timestamp()

◆ width()

◆ writeSld()

◆ writeStyle()

◆ writeSymbology()

◆ writeXml()