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git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@9026 c8812cc2-4d05-0410-92ff-de0c093fc19c
564 lines
22 KiB
Plaintext
564 lines
22 KiB
Plaintext
/*! \class QgsRasterLayer
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* \brief This class provides qgis with the ability to render raster datasets
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* onto the mapcanvas..
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*/
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class QgsRasterLayer : QgsMapLayer
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{
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%TypeHeaderCode
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#include <qgsrasterpyramid.h>
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#include <qgsrasterlayer.h>
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#include <qgscontrastenhancement.h>
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#include <qgsrastertransparency.h>
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#include <qgsrastershader.h>
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%End
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public:
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//
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// Static methods:
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//
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static void buildSupportedRasterFileFilter(QString & fileFilters);
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static void registerGdalDrivers();
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/** This helper checks to see whether the filename appears to be a valid
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raster file name */
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static bool isValidRasterFileName(const QString & theFileNameQString);
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//
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// Non Static methods:
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//
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/** \brief This is the constructor for the RasterLayer class.
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*
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* The main tasks carried out by the constructor are:
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*
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* -Populate the RasterStatsVector with initial values for each band.
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*
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* -Calculate the layer extents
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*
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* -Determine whether the layer is gray, paletted or multiband.
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*
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* -Assign sensible defaults for the red,green, blue and gray bands.
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*
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* -
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* */
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QgsRasterLayer(const QString & path = QString::null,
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const QString & baseName = QString::null);
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/** \brief The destuctor. */
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~QgsRasterLayer();
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/** \brief A list containing one RasterBandStats struct per raster band in this raster layer.
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* Note that while very RasterBandStats element will have the name and number of its associated
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* band populated, any additional stats are calculated on a need to know basis.*/
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typedef QList<QgsRasterBandStats> RasterStatsList;
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/** \brief A list containing one RasterPyramid struct per raster band in this raster layer.
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* POTENTIAL pyramid layer. How this works is we divide the height
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* and width of the raster by an incrementing number. As soon as the result
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* of the division is <=256 we stop allowing RasterPyramid stracuts
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* to be added to the list. Each time a RasterPyramid is created
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* we will check to see if a pyramid matching these dimensions already exists
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* in the raster layer, and if so mark the exists flag as true. */
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typedef QList<QgsRasterPyramid> RasterPyramidList;
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/** \brief A list containing on ContrastEnhancement object per raster band in this raster layer. */
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typedef QList<QgsContrastEnhancement> ContrastEnhancementList;
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/** \brief This typedef is used when the showProgress function is passed to gdal as a function
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pointer. */
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// typedef int (QgsRasterLayer::*showTextProgress)( double theProgress,
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// const char *theMessageCharArray,
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// void *theData);
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/** \brief Identify raster value(s) found on the point position
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*
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* \param point[in] a coordinate in the CRS of this layer.
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*/
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void identify(const QgsPoint & point, QMap<QString,QString>& results /Out/);
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/** \brief Identify arbitrary details from the WMS server found on the point position
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*
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* \param point[in] an image pixel coordinate in the last requested extent of layer.
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*
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* \return A text document containing the return from the WMS server
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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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*/
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QString identifyAsText(const QgsPoint & point);
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/** \brief Query gdal to find out the WKT projection string for this layer. This implements the virtual method of the same name defined in QgsMapLayer*/
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QString getProjectionWKT();
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/** \brief Returns the number of raster units per each raster pixel. For rasters with world file, this is normally the first row (without the sign) in that file */
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double rasterUnitsPerPixel();
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/** \brief Draws a thumbnail of the rasterlayer into the supplied pixmap pointer */
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void drawThumbnail(QPixmap * theQPixmap);
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/** \brief Get an 8x8 pixmap of the colour palette. If the layer has no palette a white pixmap will be returned. */
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QPixmap getPaletteAsPixmap();
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/** \brief This is called when the view on the rasterlayer needs to be refreshed (redrawn).
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*/
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bool draw(QgsRenderContext& renderContext);
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/** \brief This is an overloaded version of the above function that is called by both draw above and drawThumbnail */
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void draw(QPainter * theQPainter, QgsRasterViewPort * myRasterViewPort,
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QgsMapToPixel * theQgsMapToPixel = 0);
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//
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// Accessors for image height and width
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//
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/** \brief Accessor that returns the width of the (unclipped) raster */
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int getRasterXDim();
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/** \brief Accessor that returns the height of the (unclipped) raster */
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int getRasterYDim();
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//
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// Accessor and mutator for no data double
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//
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/** \brief Is the NoDataValue Valid */
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bool isNoDataValueValid();
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/** \brief Accessor that returns the NO_DATA entry for this raster. */
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double getNoDataValue(bool* isValid=0);
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/** \brief Mutator that allows the NO_DATA entry for this raster to be overridden. */
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void setNoDataValue(double theNoData);
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/** \brief Simple reset function that set the noDataValue back to the value stored in the first raster band */
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void resetNoDataValue();
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//
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// Accessor and mutator for mInvertPixelsFlag
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//
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/** \brief Accessor to find out whether the histogram should be inverted. */
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bool getInvertHistogramFlag();
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/** \brief Mutator to alter the state of the invert histogram flag. */
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void setInvertHistogramFlag(bool theFlag);
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//
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// Accessor and mutator for mStandardDeviations
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//
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/** \brief Accessor to find out how many standard deviations are being plotted. */
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double getStdDevsToPlot();
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/** \brief Mutator to alter the number of standard deviations that should be plotted. */
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void setStdDevsToPlot(double the);
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/** \brief Get the number of bands in this layer */
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unsigned int getBandCount();
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/** \brief Get RasterBandStats for a band given its number (read only) */
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const QgsRasterBandStats getRasterBandStats(int);
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/** \brief Check whether a given band number has stats associated with it */
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bool hasStats(int theBandNoInt);
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/** \brief Overloaded method that also returns stats for a band, but uses the band colour name
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* Note this approach is not recommeneded because it is possible for two gdal raster
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* bands to have the same name!
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*/
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const QgsRasterBandStats getRasterBandStats(const QString &);
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/** \brief Get the number of a band given its name. Note this will be the rewritten name set
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* up in the constructor, and will not necessarily be the same as the name retrieved directly from gdal!
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* If no matching band is found zero will be returned! */
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int getRasterBandNumber (const QString & theBandNameQString);
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/** \brief Get the name of a band given its number. */
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const QString getRasterBandName(int theBandNoInt);
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/** \brief Find out whether a given band exists. */
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bool hasBand(const QString & theBandName);
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/** \brief Call any inline image manipulation filters */
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void filterLayer(QImage * theQImage);
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/** \brief Accessor for red band name (allows alternate mappings e.g. map blue as red colour). */
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QString getRedBandName();
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/** \brief Mutator for red band name (allows alternate mappings e.g. map blue as red colour). */
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void setRedBandName(const QString & theBandNameQString);
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//
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// Accessor and mutator for green band name
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//
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/** \brief Accessor for green band name mapping. */
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QString getGreenBandName();
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/** \brief Mutator for green band name mapping. */
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void setGreenBandName(const QString & theBandNameQString);
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//
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// Accessor and mutator for blue band name
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//
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/** \brief Accessor for blue band name mapping. */
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QString getBlueBandName();
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/** \brief Mutator for blue band name mapping. */
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void setBlueBandName(const QString & theBandNameQString);
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//
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// Accessor transparency container.
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//
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QgsRasterTransparency* getRasterTransparency();
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//
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// Accessor and mutator for transparent band name
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//
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/** \brief Accessor for transparent band name mapping. */
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QString getTransparentBandName();
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/** \brief Mutator for transparent band name mapping. */
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void setTransparentBandName(const QString & theBandNameQString);
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//
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// Accessor and mutator for gray band name
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//
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/** \brief Accessor for gray band name mapping. */
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QString getGrayBandName();
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/** \brief Mutator for gray band name mapping. */
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void setGrayBandName(const QString & theBandNameQString);
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//
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// Accessor and mutator for mDebugOverlayFlag
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//
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/** \brief Accessor for a flag that determines whether to show some debug info on the image. */
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bool getShowDebugOverlayFlag();
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/** \brief Mutator for a flag that determines whether to show some debug info on the image. */
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void setShowDebugOverlayFlag(bool theFlag);
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// Accessor and mutator for min max values
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double getMinimumValue(unsigned int theBand);
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double getMinimumValue(QString theBand);
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void setMinimumValue(unsigned int theBand, double theValue);
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void setMinimumValue(QString theBand, double theValue, bool theGenerateLookupTableFlag=true);
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double getMaximumValue(unsigned int theBand);
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double getMaximumValue(QString theBand);
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void setMaximumValue(unsigned int theBand, double theValue);
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void setMaximumValue(QString theBand, double theValue, bool theGenerateLookupTableFlag=true);
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/** \brief Wrapper for GDALComputeRasterMinMax with the estimate option */
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void computeMinimumMaximumEstimates(int theBand, double* theMinMax);
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/** \brief Wrapper for GDALComputeRasterMinMax with the estimate option */
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void computeMinimumMaximumEstimates(QString theBand, double* theMinMax);
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QgsContrastEnhancement* getContrastEnhancement(unsigned int theBand);
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//
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// Accessor and mutator for the contrast enhancement algorithm
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//
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/** \brief Accessor for contrast enhancement algorithm. */
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QgsContrastEnhancement::CONTRAST_ENHANCEMENT_ALGORITHM getContrastEnhancementAlgorithm();
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/** \brief Accessor for contrast enhancement algorithm. */
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QString getContrastEnhancementAlgorithmAsQString();
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/** \brief Mutator for contrast enhancement algorithm. */
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void setContrastEnhancementAlgorithm(QgsContrastEnhancement::CONTRAST_ENHANCEMENT_ALGORITHM theAlgorithm, bool theGenerateLookupTableFlag=true);
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/** \brief Mutator for contrast enhancement algorithm. */
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void setContrastEnhancementAlgorithm(QString theAlgorithm, bool theGenerateLookupTableFlag=true);
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//
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// Mutator for the contrast enhancement function
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//
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/** \brief Mutator for contrast enhancement function. */
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void setContrastEnhancementFunction(QgsContrastEnhancementFunction* theFunction);
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/** \brief This enumerator describes the types of shading that can be used. */
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enum COLOR_SHADING_ALGORITHM
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{
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UNDEFINED_SHADING_ALGORITHM,
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PSEUDO_COLOR,
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FREAK_OUT, //it will scare your granny!
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COLOR_RAMP,
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USER_DEFINED
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};
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//
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// Accessor and mutator for the color shader algorithm
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//
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/** \brief Accessor for colour shader algorithm. */
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COLOR_SHADING_ALGORITHM getColorShadingAlgorithm();
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/** \brief Accessor for colour shader algorithm. */
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QString getColorShadingAlgorithmAsQString();
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/** \brief Mutator for color shader algorithm. */
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void setColorShadingAlgorithm(COLOR_SHADING_ALGORITHM theShaderAlgorithm);
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/** \brief Mutator for color shader algorithm. */
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void setColorShadingAlgorithm(QString theShaderAlgorithm);
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/** \brief Accessor for raster shader */
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QgsRasterShader* getRasterShader();
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/** \brief Set the raster shader function to a user defined function */
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void setRasterShaderFunction(QgsRasterShaderFunction* theFunction);
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/** \brief This enumerator describes the different kinds of drawing we can do. */
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enum DRAWING_STYLE
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{
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UNDEFINED_DRAWING_STYLE,
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SINGLE_BAND_GRAY, // a "Gray" or "Undefined" layer drawn as a range of gray colors
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SINGLE_BAND_PSEUDO_COLOR,// a "Gray" or "Undefined" layer drawn using a pseudocolor algorithm
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PALETTED_COLOR, //a "Palette" image drawn using color table
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PALETTED_SINGLE_BAND_GRAY,// a "Palette" layer drawn in gray scale (using only one of the color components)
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PALETTED_SINGLE_BAND_PSEUDO_COLOR, // a "Palette" layer having only one of its color components rendered as psuedo color
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PALETTED_MULTI_BAND_COLOR, // a "Palette" image is decomposed to 3 channels (RGB) and drawn
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// as multiband
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MULTI_BAND_SINGLE_BAND_GRAY, // a layer containing 2 or more bands, but using only one band to produce a grayscale image
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MULTI_BAND_SINGLE_BAND_PSEUDO_COLOR, //a layer containing 2 or more bands, but using only one band to produce a pseudocolor image
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MULTI_BAND_COLOR //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
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};
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DRAWING_STYLE drawingStyle;
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//
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// Accessor and mutator for drawing style.
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//
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/** \brief Accessor for drawing style. */
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DRAWING_STYLE getDrawingStyle();
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/** \brief Returns a string representation of drawing style.
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*
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* Implementaed mainly for serialisation / deserialisation of settings to xml.
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* NOTE: May be deprecated in the future!. Use alternate implementation above rather.
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* */
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QString getDrawingStyleAsQString();
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/** \brief Mutator for drawing style. */
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void setDrawingStyle(const DRAWING_STYLE & theDrawingStyle);
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/** \brief Overloaded version of the above function for convenience when restoring from xml.
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*
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* Implementaed mainly for serialisation / deserialisation of settings to xml.
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* NOTE: May be deprecated in the future! Use alternate implementation above rather.
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* */
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void setDrawingStyle(const QString & theDrawingStyleQString);
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/** \brief This enumerator describes the type of raster layer. */
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enum RASTER_LAYER_TYPE
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{
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GRAY_OR_UNDEFINED,
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PALETTE,
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MULTIBAND
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};
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RASTER_LAYER_TYPE rasterLayerType;
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//
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//accessor and for raster layer type (READ ONLY)
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//
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/** \brief Accessor for raster layer type (which is a read only property) */
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RASTER_LAYER_TYPE getRasterLayerType();
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/** \brief Accessor for hasPyramidsFlag (READ ONLY) */
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bool getHasPyramidsFlag();
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/** \brief Get a legend image for this layer. */
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QPixmap getLegendQPixmap();
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/** \brief Overloaded version of above function that can print layer name onto legend. */
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QPixmap getLegendQPixmap(bool);
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/** \brief Use this method when you want an annotated legend suitable for print output etc.
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* @param int theLabelCountInt Number of vertical labels to display (defaults to 3)
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* */
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QPixmap getDetailedLegendQPixmap(int theLabelCount);
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/**
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* Returns the sublayers of this layer
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*
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* (Useful for providers that manage their own layers, such as WMS)
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*
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*/
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QStringList subLayers() const;
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/**
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* Reorders the *previously selected* sublayers of this layer from bottom to top
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*
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* (Useful for providers that manage their own layers, such as WMS)
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*
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*/
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virtual void setLayerOrder(const QStringList & layers);
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/**
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* Set the visibility of the given sublayer name
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*/
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virtual void setSubLayerVisibility(const QString & name, bool vis);
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/** \brief Emit a signal asking for a repaint. (inherited from maplayer) */
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void triggerRepaint();
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/** \brief Obtain GDAL Metadata for this layer */
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QString getMetadata();
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/** \brief Accessor for ths raster layers pyramid list. 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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RasterPyramidList buildRasterPyramidList();
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/** \brief Helper method to retrieve the nth pyramid layer struct from the PyramidList.
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* If the nth layer does not exist, NULL will be returned. */
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// RasterPyramid getRasterPyramid(int thePyramidNo);
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/**Currently returns always false*/
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bool isEditable() const;
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/** Return time stamp for given file name */
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static QDateTime lastModified ( const QString & name );
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/**Copies the symbology settings from another layer. Returns true in case of success*/
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bool copySymbologySettings(const QgsMapLayer& other);
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bool isSymbologyCompatible(const QgsMapLayer& other) const;
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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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QString errorCaptionString();
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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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QString errorString();
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/** Returns the data provider
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*
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* \retval 0 if not using the data provider model (i.e. directly using GDAL)
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*/
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QgsRasterDataProvider* getDataProvider();
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/** Returns the data provider in a const-correct manner
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*
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* \retval 0 if not using the data provider model (i.e. directly using GDAL)
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*/
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// PyQGIS: commented out, has the same signature as the function above
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// const QgsRasterDataProvider* getDataProvider() const;
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/** \brief Mutator for mUserDefinedRGBMinMaxFlag */
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void setUserDefinedRGBMinMax(bool theBool);
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/** \brief Accessor for mUserDefinedRGBMinMaxFlag. */
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bool getUserDefinedRGBMinMax();
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/** \brief Mutator for mUserDefinedGrayMinMaxFlag */
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void setUserDefinedGrayMinMax(bool theBool);
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/** \brief Accessor for mUserDefinedGrayMinMaxFlag. */
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bool getUserDefinedGrayMinMax();
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public slots:
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/**
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* Convert this raster to another format
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*/
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//void const convertTo();
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/**
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* Mainly inteded for use in propogating progress updates from gdal up to the parent app.
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**/
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void updateProgress(int,int);
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/** \brief Create gdal pyramid overviews for this layer.
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* This will speed up performance at the expense of hard drive space.
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* Also, write access to the file is required for creating internal pyramids,
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* and to the directory in which the files exists if external
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* pyramids (.ovr) are to be created. If no paramter is passed in
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* it will default to nearest neighbor resampling.
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* @param theTryInternalFlag - Try to make the pyramids internal to
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* the raster file if supported (e.g. geotiff). If not supported it
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* will revert to creating external .ovr file anyway.
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* \return null string on success, otherwise a string specifying error
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*/
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QString buildPyramids(const RasterPyramidList &,
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const QString & theResamplingMethod="NEAREST",
|
|
bool theTryInternalFlag=false);
|
|
/** \brief Used at the moment by the above function but hopefully will later
|
|
be useable by any operation that needs to notify the user of its progress. */
|
|
/*
|
|
int showTextProgress( double theProgress,
|
|
const char *theMessageCharArray,
|
|
void *theData);
|
|
*/
|
|
|
|
/** Populate the histogram vector for a given layer
|
|
* @param theBandNoInt - which band to compute the histogram for
|
|
* @param theBinCountInt - how many 'bins' to categorise the data into
|
|
* @param theIgnoreOutOfRangeFlag - whether to ignore values that are out of range (default=true)
|
|
* @param theThoroughBandScanFlag - whether to visit each cell when computing the histogram (default=false)
|
|
*/
|
|
void populateHistogram(int theBandNoInt,
|
|
int theBinCountInt=256,
|
|
bool theIgnoreOutOfRangeFlag=true,
|
|
bool theThoroughBandScanFlag=false);
|
|
|
|
/** \brief Color table
|
|
* \param band number
|
|
* \return pointer to color table
|
|
*/
|
|
QgsColorTable *colorTable ( int theBandNoInt );
|
|
protected:
|
|
|
|
/** reads vector layer specific state from project file DOM node.
|
|
|
|
@note
|
|
|
|
Called by QgsMapLayer::readXML().
|
|
|
|
*/
|
|
/* virtual */ bool readXml( QDomNode & layer_node );
|
|
|
|
|
|
|
|
/** write vector layer specific state to project file DOM node.
|
|
|
|
@note
|
|
|
|
Called by QgsMapLayer::writeXML().
|
|
|
|
*/
|
|
/* virtual */ bool writeXml( QDomNode & layer_node, QDomDocument & doc );
|
|
|
|
|
|
/*
|
|
*
|
|
* New functions that will convert this class to a data provider interface
|
|
* (B Morley)
|
|
*
|
|
*/
|
|
|
|
public:
|
|
|
|
//! Constructor in provider mode
|
|
// TODO Rename into a general constructor when the old raster interface is retired
|
|
// \param dummy is just there to distinguish this function signature from the old non-provider one.
|
|
QgsRasterLayer(int dummy,
|
|
const QString & baseName = QString(),
|
|
const QString & path = QString(),
|
|
const QString & providerLib = QString(),
|
|
const QStringList & layers = QStringList(),
|
|
const QStringList & styles = QStringList(),
|
|
const QString & format = QString(),
|
|
const QString & crs = QString());
|
|
|
|
void setDataProvider( const QString & provider,
|
|
const QStringList & layers,
|
|
const QStringList & styles,
|
|
const QString & format,
|
|
const QString & crs);
|
|
|
|
//! Does this layer use a provider for setting/retrieving data?
|
|
bool usesProvider();
|
|
|
|
//! Which provider is being used for this Raster Layer?
|
|
QString providerKey();
|
|
|
|
public slots:
|
|
|
|
void showStatusMessage(const QString & theMessage);
|
|
|
|
};
|
|
|