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300 lines
12 KiB
Plaintext
300 lines
12 KiB
Plaintext
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/**
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* \brief Handles asynchronous download of images
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*
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* \note added in 2.8
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*/
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class QgsImageFetcher : QObject
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{
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%TypeHeaderCode
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#include <qgsrasterdataprovider.h>
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%End
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public:
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QgsImageFetcher();
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virtual ~QgsImageFetcher();
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// Make sure to connect to "finish" and "error" before starting
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virtual void start() = 0;
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signals:
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void finish( const QImage& legend );
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void progress( qint64 received, qint64 total );
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void error( const QString& msg );
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};
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/** Base class for raster data providers
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*
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* \note This class has been copied and pasted from
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* QgsVectorDataProvider, and does not yet make
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* sense for Raster layers.
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*/
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class QgsRasterDataProvider : QgsDataProvider, QgsRasterInterface
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{
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%TypeHeaderCode
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#include <qgsrasterdataprovider.h>
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#include <qgsrasterinterface.h>
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#include <qgsrasteridentifyresult.h>
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%End
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public:
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QgsRasterDataProvider();
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QgsRasterDataProvider( const QString & uri );
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virtual ~QgsRasterDataProvider();
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virtual QgsRasterInterface * clone() const = 0;
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/* It makes no sense to set input on provider */
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bool setInput( QgsRasterInterface* input );
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/** \brief Renders the layer as an image
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\note When render caching (/qgis/enable_render_caching) is on the wms
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provider doesn't wait for the reply of the getmap request or all
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tiles replies and can return incomplete images.
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Temporarily disable render caching if you require the complete
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wms image in the first call.
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*/
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virtual QImage* draw( const QgsRectangle & viewExtent, int pixelWidth, int pixelHeight ) = 0;
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/** Get the extent of the data source.
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* @return QgsRectangle containing the extent of the layer */
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virtual QgsRectangle extent() = 0;
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/** Returns data type for the band specified by number */
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virtual QGis::DataType dataType( int bandNo ) const = 0;
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/** Returns source data type for the band specified by number,
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* source data type may be shorter than dataType */
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virtual QGis::DataType srcDataType( int bandNo ) const = 0;
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/** Returns data type for the band specified by number */
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virtual int colorInterpretation( int theBandNo ) const;
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QString colorName( int colorInterpretation ) const;
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/** Reload data (data could change) */
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virtual bool reload();
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virtual QString colorInterpretationName( int theBandNo ) const;
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/** Read band scale for raster value
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* @@note added in 2.3 */
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virtual double bandScale( int bandNo ) const;
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/** Read band offset for raster value
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* @@note added in 2.3 */
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virtual double bandOffset( int bandNo ) const;
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/** Get block size */
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virtual int xBlockSize() const;
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virtual int yBlockSize() const;
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/** Get raster size */
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virtual int xSize() const;
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virtual int ySize() const;
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/** Read block of data using given extent and size. */
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virtual QgsRasterBlock *block( int theBandNo, const QgsRectangle &theExtent, int theWidth, int theHeight ) / Factory /;
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/* Return true if source band has no data value */
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virtual bool srcHasNoDataValue( int bandNo ) const;
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/** \brief Get source nodata value usage */
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virtual bool useSrcNoDataValue( int bandNo ) const;
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/** \brief Set source nodata value usage */
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virtual void setUseSrcNoDataValue( int bandNo, bool use );
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/** Value representing no data value. */
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virtual double srcNoDataValue( int bandNo ) const;
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virtual void setUserNoDataValue( int bandNo, QgsRasterRangeList noData );
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/** Get list of user no data value ranges */
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virtual QgsRasterRangeList userNoDataValues( int bandNo ) const;
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virtual QList<QgsColorRampShader::ColorRampItem> colorTable( int bandNo ) const;
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/** \brief Returns the sublayers of this layer - useful for providers that manage
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* their own layers, such as WMS */
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virtual QStringList subLayers() const;
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/** \brief Returns the legend rendered as pixmap
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*
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* useful for that layer that need to get legend layer remotely as WMS
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* \param scale Optional parameter that is the Scale of the layer
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* \param forceRefresh Optional bool parameter to force refresh getLegendGraphic call
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* \param visibleExtent Visible extent for providers supporting contextual legends, in layer CRS
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* \note visibleExtent parameter added in 2.8 (no available in python bindings)
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*/
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virtual QImage getLegendGraphic( double scale = 0, bool forceRefresh = false, const QgsRectangle * visibleExtent = 0 );
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/**
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* \brief Get an image downloader for the raster legend
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*
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* \param mapSettings map settings for legend providers supporting
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* contextual legends.
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*
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* \return a download handler or null if the provider does not support
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* legend at all. Ownership of the returned object is transferred
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* to caller.
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*
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* \note added in 2.8
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*
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*/
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virtual QgsImageFetcher* getLegendGraphicFetcher( const QgsMapSettings* mapSettings ) /Factory/;
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/** \brief Create pyramid overviews */
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virtual QString buildPyramids( const QList<QgsRasterPyramid> & thePyramidList,
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const QString & theResamplingMethod = "NEAREST",
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QgsRaster::RasterPyramidsFormat theFormat = QgsRaster::PyramidsGTiff,
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const QStringList & theConfigOptions = QStringList() );
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/** \brief Accessor for ths raster layers pyramid list.
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* @param overviewList used to construct the pyramid list (optional), when empty the list is defined by the provider.
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* A pyramid list defines the
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* POTENTIAL pyramids that can be in a raster. To know which of the pyramid layers
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* ACTUALLY exists you need to look at the existsFlag member in each struct stored in the
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* list.
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*/
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virtual QList<QgsRasterPyramid> buildPyramidList( QList<int> overviewList = QList<int>() );
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/** \brief Returns true if raster has at least one populated histogram. */
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bool hasPyramids();
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/**
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* Get metadata in a format suitable for feeding directly
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* into a subset of the GUI raster properties "Metadata" tab.
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*/
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virtual QString metadata() = 0;
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/** \brief Identify raster value(s) found on the point position. The context
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* parameters theExtent, theWidth and theHeight are important to identify
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* on the same zoom level as a displayed map and to do effective
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* caching (WCS). If context params are not specified the highest
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* resolution is used. capabilities() may be used to test if format
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* is supported by provider. Values are set to 'no data' or empty string
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* if point is outside data source extent.
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*
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* \note The arbitraryness of the returned document is enforced by WMS standards
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* up to at least v1.3.0
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* @param thePoint coordinates in data source CRS
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* @param theFormat result format
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* @param theExtent context extent
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* @param theWidth context width
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* @param theHeight context height
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* @return QgsRaster::IdentifyFormatValue: map of values for each band, keys are band numbers
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* (from 1).
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* QgsRaster::IdentifyFormatFeature: map of QgsRasterFeatureList for each sublayer
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* (WMS) - TODO: it is not consistent with QgsRaster::IdentifyFormatValue.
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* QgsRaster::IdentifyFormatHtml: map of HTML strings for each sublayer (WMS).
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* Empty if failed or there are no results (TODO: better error reporting).
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*/
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//virtual QMap<int, QVariant> identify( const QgsPoint & thePoint, QgsRaster::IdentifyFormat theFormat, const QgsRectangle &theExtent = QgsRectangle(), int theWidth = 0, int theHeight = 0 );
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virtual QgsRasterIdentifyResult identify( const QgsPoint & thePoint, QgsRaster::IdentifyFormat theFormat, const QgsRectangle &theExtent = QgsRectangle(), int theWidth = 0, int theHeight = 0 );
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/**
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* \brief Returns the caption error text for the last error in this provider
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*
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* If an operation returns 0 (e.g. draw()), this function
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* returns the text of the error associated with the failure.
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* Interactive users of this provider can then, for example,
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* call a QMessageBox to display the contents.
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*
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*/
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virtual QString lastErrorTitle() = 0;
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/**
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* \brief Returns the verbose error text for the last error in this provider
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*
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* If an operation returns 0 (e.g. draw()), this function
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* returns the text of the error associated with the failure.
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* Interactive users of this provider can then, for example,
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* call a QMessageBox to display the contents.
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*
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*/
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virtual QString lastError() = 0;
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/** Returns the format of the error text for the last error in this provider */
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virtual QString lastErrorFormat();
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/**Returns the dpi of the output device. */
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int dpi() const;
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/**Sets the output device resolution. */
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void setDpi( int dpi );
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/** Time stamp of data source in the moment when data/metadata were loaded by provider */
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virtual QDateTime timestamp() const;
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/** Current time stamp of data source */
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virtual QDateTime dataTimestamp() const;
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/**Writes into the provider datasource*/
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// TODO: add data type (may be defferent from band type)
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virtual bool write( void* data, int band, int width, int height, int xOffset, int yOffset );
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/** Creates a new dataset with mDataSourceURI */
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static QgsRasterDataProvider* create( const QString &providerKey,
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const QString &uri,
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const QString& format, int nBands,
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QGis::DataType type,
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int width, int height, double* geoTransform,
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const QgsCoordinateReferenceSystem& crs,
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QStringList createOptions = QStringList() );
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/** Set no data value on created dataset
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* @param bandNo band number
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* @param noDataValue no data value
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*/
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virtual bool setNoDataValue( int bandNo, double noDataValue );
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/** Remove dataset*/
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virtual bool remove();
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/** Returns a list of pyramid resampling method name and label pairs
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* for given provider */
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static QList<QPair<QString, QString> > pyramidResamplingMethods( QString providerKey );
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/** Validates creation options for a specific dataset and destination format.
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* @note used by GDAL provider only
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* @note see also validateCreationOptionsFormat() in gdal provider for validating options based on format only */
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virtual QString validateCreationOptions( const QStringList& createOptions, QString format );
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/** Validates pyramid creation options for a specific dataset and destination format
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* @note used by GDAL provider only */
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virtual QString validatePyramidsConfigOptions( QgsRaster::RasterPyramidsFormat pyramidsFormat,
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const QStringList & theConfigOptions, const QString & fileFormat );
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static QString identifyFormatName( QgsRaster::IdentifyFormat format );
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static QgsRaster::IdentifyFormat identifyFormatFromName( QString formatName );
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static QString identifyFormatLabel( QgsRaster::IdentifyFormat format );
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static Capability identifyFormatToCapability( QgsRaster::IdentifyFormat format );
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signals:
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/** Emit a signal to notify of the progress event.
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* Emitted theProgress is in percents (0.0-100.0) */
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void progress( int theType, double theProgress, QString theMessage );
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void progressUpdate( int theProgress );
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protected:
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/** Fill in histogram defaults if not specified */
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void initHistogram( QgsRasterHistogram &theHistogram, int theBandNo,
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int theBinCount,
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double theMinimum,
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double theMaximum,
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const QgsRectangle & theExtent = QgsRectangle(),
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int theSampleSize = 0,
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bool theIncludeOutOfRange = false );
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/** Fill in statistics defaults if not specified */
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void initStatistics( QgsRasterBandStats &theStatistics, int theBandNo,
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int theStats = QgsRasterBandStats::All,
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const QgsRectangle & theExtent = QgsRectangle(),
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int theBinCount = 0 );
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};
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