This class provides qgis with the ability to render raster datasets onto the mapcanvas. More...

#include <qgsrasterlayer.h>

Inheritance diagram for QgsRasterLayer:

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

Public Types
enum	ColorShadingAlgorithm { UndefinedShader, PseudoColorShader, FreakOutShader, ColorRampShader, UserDefinedShader }
	This enumerator describes the types of shading that can be used. More...

enum	LayerType { GrayOrUndefined, Palette, Multiband, ColorLayer }
	This enumerator describes the type of raster layer. More...

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

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

enum	ReadFlag { FlagDontResolveLayers = 1 << 0 }
	Flags which control project read behavior. More...

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, AllStyleCategories }
	Categories of style to distinguish appropriate sections for import/export. More...

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

void	showStatusMessage (const QString &message)

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

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

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

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

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. More...

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

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

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

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

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

	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. More...

	~QgsRasterLayer () override

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

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

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

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

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

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

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

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

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

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. More...

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

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

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

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

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

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

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

QgsRasterPipe *	pipe ()
	Returns the raster pipe. More...

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. More...

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

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

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

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

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

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

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

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

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

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. More...

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

void	setDataProvider (const QString &provider, const QgsDataProvider::ProviderOptions &options)
	Set the data provider. More...

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

void	setDefaultContrastEnhancement ()
	Sets the default contrast enhancement. More...

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

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

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

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

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

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

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

Public Member Functions inherited from QgsMapLayer
	QgsMapLayer (QgsMapLayerType type=QgsMapLayerType::VectorLayer, const QString &name=QString(), const QString &source=QString())
	Constructor for QgsMapLayer. More...

	QgsMapLayer (QgsMapLayer const &)=delete
	QgsMapLayer cannot be copied. More...

	~QgsMapLayer () override

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

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

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

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

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

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

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

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

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

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

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

virtual QgsError	error () const
	Gets current status error. More...

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

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. More...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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) More...

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) More...

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) More...

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

virtual QString	loadNamedStyle (const QString &uri, bool &resultFlag, QgsMapLayer::StyleCategories categories=QgsMapLayer::AllStyleCategories)
	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) More...

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

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

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

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

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) More...

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

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

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

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

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

QgsMapLayer &	operator= (QgsMapLayer const &)=delete
	QgsMapLayer cannot be copied. More...

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

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

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

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

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

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

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

virtual bool	readSymbology (const QDomNode &node, QString &errorMessage, QgsReadWriteContext &context, StyleCategories categories=AllStyleCategories)=0
	Read the symbology for the current layer from the DOM node supplied. More...

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

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

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

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

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) More...

virtual 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) More...

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) More...

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) More...

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

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

void	setAttribution (const QString &attrib)
	Sets the attribution of the layer used by QGIS Server in GetCapabilities request. More...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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. More...

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

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

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

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

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

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

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

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

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) More...

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

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. More...

QgsMapLayerType	type () const
	Returns the type of the layer. More...

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

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

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

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

virtual bool	writeSymbology (QDomNode &node, QDomDocument &doc, QString &errorMessage, const QgsReadWriteContext &context, StyleCategories categories=AllStyleCategories) const =0
	Write the style for the layer into the docment provided. More...

Static Public Member Functions
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. More...

static bool	isValidRasterFileName (const QString &fileNameQString)

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

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

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

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

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. More...

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. More...

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

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

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

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

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

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. More...

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. More...

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

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

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

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

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

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. More...

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

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

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. More...

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

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

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

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

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

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

void	setValid (bool valid)
	Sets whether layer is valid or not - should be used in constructor. More...

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

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

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

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

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

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

void	configChanged ()
	Emitted whenever the configuration is changed. More...

void	crsChanged ()
	Emit a signal that layer's CRS has been reset. More...

void	dataChanged ()
	Data of layer changed. More...

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

void	dependenciesChanged ()
	Emitted when dependencies are changed. More...

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

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

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

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

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

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

void	rendererChanged ()
	Signal emitted when renderer is changed. More...

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. More...

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

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

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. More...

Protected Attributes inherited from QgsMapLayer
QString	mAbstract
	Description of the layer. More...

QString	mAttribution
	Attribution of the layer. More...

QString	mAttributionUrl

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

QString	mDataUrl
	DataUrl of the layer. More...

QString	mDataUrlFormat

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

QgsError	mError
	Error. More...

QgsRectangle	mExtent
	Extent of the layer. More...

bool	mIsRefreshOnNofifyEnabled = false

QString	mKeywordList

QString	mLayerName
	Name of the layer - used for display. More...

QString	mLegendUrl
	WMS legend. More...

QString	mLegendUrlFormat

QString	mMetadataUrl
	MetadataUrl of the layer. More...

QString	mMetadataUrlFormat

QString	mMetadataUrlType

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

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

QString	mRefreshOnNofifyMessage

QString	mShortName

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

QString	mTitle

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

Properties inherited from QgsMapLayer
int	autoRefreshInterval

QgsCoordinateReferenceSystem	crs

QgsLayerMetadata	metadata

QString	name

Detailed Description

This class provides qgis with the ability to render raster datasets onto the mapcanvas.

The qgsrasterlayer class makes use of gdal for data io, and thus supports any gdal supported format. The constructor attempts to infer what type of file (LayerType) is being opened - not in terms of the file format (tif, ascii grid etc.) but rather in terms of whether the image is a GRAYSCALE, PaletteD or Multiband,

Within the three allowable raster layer types, there are 8 permutations of how a layer can actually be rendered. These are defined in the DrawingStyle enum and consist of:

SingleBandGray -> a GRAYSCALE layer drawn as a range of gray colors (0-255) SingleBandPseudoColor -> a GRAYSCALE layer drawn using a pseudocolor algorithm PalettedSingleBandGray -> a PaletteD layer drawn in gray scale (using only one of the color components) PalettedSingleBandPseudoColor -> a PaletteD layer having only one of its color components rendered as pseudo color PalettedMultiBandColor -> a PaletteD image where the bands contains 24bit color info and 8 bits is pulled out per color MultiBandSingleBandGray -> a layer containing 2 or more bands, but using only one band to produce a grayscale image MultiBandSingleBandPseudoColor -> a layer containing 2 or more bands, but using only one band to produce a pseudocolor image MultiBandColor -> a layer containing 2 or more bands, mapped to the three RGBcolors. In the case of a multiband with only two bands, one band will have to be mapped to more than one color

Each of the above mentioned drawing styles is implemented in its own draw* function. Some of the drawing styles listed above require statistics about the layer such as the min / max / mean / stddev etc. statistics for a band can be gathered using the bandStatistics function. Note that statistics gathering is a slow process and every effort should be made to call this function as few times as possible. For this reason, qgsraster has a vector class member to store stats for each band. The constructor initializes this vector on startup, but only populates the band name and number fields.

Note that where bands are of gdal 'undefined' type, their values may exceed the renderable range of 0-255. Because of this a linear scaling histogram enhanceContrast is applied to undefined layers to normalise the data into the 0-255 range.

A qgsrasterlayer band can be referred to either by name or by number (base=1). It should be noted that band names as stored in datafiles may not be unique, and so the rasterlayer class appends the band number in brackets behind each band name.

Sample usage of the QgsRasterLayer class:

QString myFileNameQString = "/path/to/file";
QString myBaseNameQString = "my layer";
QgsRasterLayer *myRasterLayer = new QgsRasterLayer(myFileNameQString, myBaseNameQString);

In order to automate redrawing of a raster layer, you should link it to a map canvas like this :

QObject::connect( myRasterLayer, SIGNAL(repaintRequested()), mapCanvas, SLOT(refresh()) );

Once a layer has been created you can find out what type of layer it is (GrayOrUndefined, Palette or Multiband):

if (rasterLayer->rasterType()==QgsRasterLayer::Multiband)
{
  //do something
}
else if (rasterLayer->rasterType()==QgsRasterLayer::Palette)
{
  //do something
}
else // QgsRasterLayer::GrayOrUndefined
{
  //do something.
}

Raster layers can also have an arbitrary level of transparency defined, and have their color palettes inverted using the setTransparency and setInvertHistogram methods.

Pseudocolor images can have their output adjusted to a given number of standard deviations using the setStandardDeviations method.

The final area of functionality you may be interested in is band mapping. Band mapping allows you to choose arbitrary band -> color mappings and is applicable only to Palette and Multiband rasters, There are four mappings that can be made: red, green, blue and gray. Mappings are non-exclusive. That is a given band can be assigned to no, some or all color mappings. The constructor sets sensible defaults for band mappings but these can be overridden at run time using the setRedBandName, setGreenBandName, setBlueBandName and setGrayBandName methods.

Definition at line 137 of file qgsrasterlayer.h.

Member Enumeration Documentation

◆ ColorShadingAlgorithm

enum QgsRasterLayer::ColorShadingAlgorithm

This enumerator describes the types of shading that can be used.

Enumerator
UndefinedShader
PseudoColorShader
FreakOutShader
ColorRampShader
UserDefinedShader

Definition at line 239 of file qgsrasterlayer.h.

◆ LayerType

enum QgsRasterLayer::LayerType

This enumerator describes the type of raster layer.

Enumerator
GrayOrUndefined
Palette
Multiband
ColorLayer

Definition at line 249 of file qgsrasterlayer.h.

Constructor & Destructor Documentation

◆ QgsRasterLayer() [1/2]

QgsRasterLayer::QgsRasterLayer ( )

Constructor. Provider is not set.

Definition at line 101 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 111 of file qgsrasterlayer.cpp.

◆ ~QgsRasterLayer()

QgsRasterLayer::~QgsRasterLayer ( )

override

Definition at line 131 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 1322 of file qgsrasterlayer.cpp.

◆ bandCount()

int QgsRasterLayer::bandCount ( ) const

Returns the number of bands in this layer.

Definition at line 209 of file qgsrasterlayer.cpp.

◆ bandName()

QString QgsRasterLayer::bandName ( int bandNoInt ) const

Returns the name of a band given its number.

Definition at line 215 of file qgsrasterlayer.cpp.

◆ brightnessFilter()

QgsBrightnessContrastFilter* QgsRasterLayer::brightnessFilter ( ) const

inline

Returns the raster's brightness/contrast filter.

See also: resampleFilter(); hueSaturationFilter()

Definition at line 331 of file qgsrasterlayer.h.

◆ 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

Since: QGIS 3.0

Implements QgsMapLayer.

Definition at line 139 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.

Since: QGIS 2.4

Implements QgsMapLayer.

Definition at line 243 of file qgsrasterlayer.cpp.

◆ dataProvider() [1/2]

QgsRasterDataProvider * QgsRasterLayer::dataProvider ( )

overridevirtual

Returns the source data provider.

This will be nullptr if the layer is invalid.

Reimplemented from QgsMapLayer.

Definition at line 225 of file qgsrasterlayer.cpp.

◆ dataProvider() [2/2]

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 230 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 2118 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 1223 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 249 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 2022 of file qgsrasterlayer.cpp.

◆ height()

int QgsRasterLayer::height ( ) const

Returns the height of the (unclipped) raster.

See also: width()

Definition at line 2298 of file qgsrasterlayer.cpp.

◆ htmlMetadata()

QString QgsRasterLayer::htmlMetadata ( ) const

overridevirtual

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

Since: QGIS 3.0

Reimplemented from QgsMapLayer.

Definition at line 291 of file qgsrasterlayer.cpp.

◆ hueSaturationFilter()

QgsHueSaturationFilter* QgsRasterLayer::hueSaturationFilter ( ) const

inline

Returns the raster's hue/saturation filter.

See also: resampleFilter(); brightnessFilter()

Definition at line 339 of file qgsrasterlayer.h.

◆ 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 939 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.

Since: QGIS 2.16

Reimplemented from QgsMapLayer.

Definition at line 393 of file qgsrasterlayer.h.

◆ isValidRasterFileName() [1/2]

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 165 of file qgsrasterlayer.cpp.

◆ isValidRasterFileName() [2/2]

bool QgsRasterLayer::isValidRasterFileName ( const QString & fileNameQString )

static

Definition at line 171 of file qgsrasterlayer.cpp.

◆ lastModified()

QDateTime QgsRasterLayer::lastModified ( const QString & name )

static

Returns time stamp for given file name.

Definition at line 177 of file qgsrasterlayer.cpp.

◆ legendSymbologyItems()

QgsLegendColorList QgsRasterLayer::legendSymbologyItems ( ) const

Returns a list with classification items (Text and color)

Definition at line 280 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 485 of file qgsrasterlayer.cpp.

◆ pipe()

QgsRasterPipe* QgsRasterLayer::pipe ( )

inline

Returns the raster pipe.

Definition at line 344 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.

Since: QGIS 2.4

Definition at line 1571 of file qgsrasterlayer.cpp.

◆ providerType()

QString QgsRasterLayer::providerType ( ) const

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

Definition at line 539 of file qgsrasterlayer.cpp.

◆ rasterType()

LayerType QgsRasterLayer::rasterType ( )

inline

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

Definition at line 302 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 544 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 559 of file qgsrasterlayer.cpp.

◆ readStyle()

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

overrideprotected

Definition at line 1735 of file qgsrasterlayer.cpp.

◆ readSymbology()

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

overrideprotected

Definition at line 1640 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 1740 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 1085 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 1126 of file qgsrasterlayer.cpp.

◆ reload()

void QgsRasterLayer::reload ( )

overridevirtual

Synchronises with changes in the datasource.

Reimplemented from QgsMapLayer.

Definition at line 235 of file qgsrasterlayer.cpp.

◆ renderer()

QgsRasterRenderer* QgsRasterLayer::renderer ( ) const

inline

Returns the raster's renderer.

See also: setRenderer()

Definition at line 315 of file qgsrasterlayer.h.

◆ resampleFilter()

QgsRasterResampleFilter* QgsRasterLayer::resampleFilter ( ) const

inline

Returns the raster's resample filter.

See also: brightnessFilter(); hueSaturationFilter()

Definition at line 323 of file qgsrasterlayer.h.

◆ 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 944 of file qgsrasterlayer.cpp.

◆ setDataProvider() [1/2]

void QgsRasterLayer::setDataProvider ( const QString & provider )

Set the data provider.

Deprecated:: Use the version with ProviderOptions instead.

Definition at line 195 of file qgsrasterlayer.cpp.

◆ setDataProvider() [2/2]

void QgsRasterLayer::setDataProvider	(	const QString &	provider,
		const QgsDataProvider::ProviderOptions &	options
	)

Set the data provider.

Parameters

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

Since: QGIS 3.2

Definition at line 581 of file qgsrasterlayer.cpp.

◆ setDataSource()

void QgsRasterLayer::setDataSource	(	const QString &	dataSource,
		const QString &	baseName,
		const QString &	provider,
		const QgsDataProvider::ProviderOptions &	options,
		bool	loadDefaultStyleFlag = `false`
	)

overridevirtual

Updates the data source of the layer.

The layer's renderer and legend will be preserved only if the geometry type of the new data source matches the current geometry type of the layer.

Parameters

dataSource	new layer data source
baseName	base name of the layer
provider	provider string
options	provider options
loadDefaultStyleFlag	set to `true` to reset the layer's style to the default for the data source

See also: dataSourceChanged()

Since: QGIS 3.6

Reimplemented from QgsMapLayer.

Definition at line 812 of file qgsrasterlayer.cpp.

◆ setDefaultContrastEnhancement()

void QgsRasterLayer::setDefaultContrastEnhancement ( )

Sets the default contrast enhancement.

Definition at line 1283 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 1294 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 1536 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 1306 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 1558 of file qgsrasterlayer.cpp.

◆ showStatusMessage

void QgsRasterLayer::showStatusMessage ( const QString & message )

slot

Definition at line 1549 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 1564 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 1317 of file qgsrasterlayer.cpp.

◆ width()

int QgsRasterLayer::width ( ) const

Returns the width of the (unclipped) raster.

See also: height()

Definition at line 2292 of file qgsrasterlayer.cpp.

◆ writeSld()

bool QgsRasterLayer::writeSld	(	QDomNode &	node,
		QDomDocument &	doc,
		QString &	errorMessage,
		const QgsStringMap &	props = `QgsStringMap()`
	)		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 1333 of file qgsrasterlayer.cpp.

◆ writeStyle()

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

overrideprotected

Definition at line 1929 of file qgsrasterlayer.cpp.

◆ writeSymbology()

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

overrideprotected

Definition at line 1892 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 1939 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 152 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 161 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 149 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 158 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 143 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 146 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 155 of file qgsrasterlayer.h.

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

/build/qgis-3.10.0+15buster/src/core/raster/qgsrasterlayer.h
/build/qgis-3.10.0+15buster/src/core/raster/qgsrasterlayer.cpp

Classes

Public Types

Public Slots

Public Member Functions

Static Public Member Functions

Static Public Attributes

Protected Member Functions

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

◆ ColorShadingAlgorithm

◆ LayerType

Constructor & Destructor Documentation

◆ QgsRasterLayer() [1/2]

◆ QgsRasterLayer() [2/2]

◆ ~QgsRasterLayer()

Member Function Documentation

◆ accept()

◆ bandCount()

◆ bandName()

◆ brightnessFilter()

◆ clone()

◆ createMapRenderer()

◆ dataProvider() [1/2]

◆ dataProvider() [2/2]

◆ decodedSource()

◆ defaultContrastEnhancementSettings()

◆ draw()

◆ encodedSource()

◆ height()

◆ htmlMetadata()

◆ hueSaturationFilter()

◆ ignoreExtents()

◆ isSpatial()

◆ isValidRasterFileName() [1/2]

◆ isValidRasterFileName() [2/2]

◆ lastModified()

◆ legendSymbologyItems()

◆ paletteAsPixmap()

◆ pipe()

◆ previewAsImage()

◆ providerType()

◆ rasterType()

◆ rasterUnitsPerPixelX()

◆ rasterUnitsPerPixelY()

◆ readStyle()

◆ readSymbology()

◆ readXml()

◆ refreshContrastEnhancement()

◆ refreshRendererIfNeeded()

◆ reload()

◆ renderer()

◆ resampleFilter()

◆ setContrastEnhancement()

◆ setDataProvider() [1/2]

◆ setDataProvider() [2/2]

◆ setDataSource()

◆ setDefaultContrastEnhancement()

◆ setLayerOrder()

◆ setRenderer()

◆ setSubLayerVisibility()

◆ setTransformContext

◆ showStatusMessage

◆ subLayers()

◆ timestamp()

◆ width()

◆ writeSld()

◆ writeStyle()

◆ writeSymbology()

◆ writeXml()

Member Data Documentation

◆ MULTIPLE_BAND_MULTI_BYTE_ENHANCEMENT_ALGORITHM

◆ MULTIPLE_BAND_MULTI_BYTE_MIN_MAX_LIMITS

◆ MULTIPLE_BAND_SINGLE_BYTE_ENHANCEMENT_ALGORITHM

◆ MULTIPLE_BAND_SINGLE_BYTE_MIN_MAX_LIMITS

◆ SAMPLE_SIZE

◆ SINGLE_BAND_ENHANCEMENT_ALGORITHM

◆ SINGLE_BAND_MIN_MAX_LIMITS