mirror of
https://github.com/qgis/QGIS.git
synced 2025-02-28 00:17:30 -05:00
532eb58d1f
This commit implements the improvements described at: https://lists.osgeo.org/pipermail/qgis-developer/2016-September/044393.html The QgsRasterMinMaxWidget now offers a seetting to specify that the statistics should be computed each time the canvas extent changes. Other changes: - the content of the QgsRasterMinMaxWidget is now persistant. - there is no longer any Load button. The global Apply / OK button of the raster properties dialog has this effect. - the default "limits" for single band raster is now MinMax and not CumulativeCut - the default "limits" can be configured for single band, multi band single byte and multi band multi byte - "Strech using current extent" honours the "limits" instead of forcing min/max.
233 lines
8.7 KiB
Plaintext
233 lines
8.7 KiB
Plaintext
/** \class QgsRasterLayer
|
|
* \brief This class provides qgis with the ability to render raster datasets
|
|
* onto the mapcanvas..
|
|
*/
|
|
|
|
class QgsRasterLayer : QgsMapLayer
|
|
{
|
|
%TypeHeaderCode
|
|
#include <qgsrasterlayer.h>
|
|
%End
|
|
|
|
public:
|
|
|
|
/** \brief Default sample size (number of pixels) for estimated statistics/histogram calculation */
|
|
static const double SAMPLE_SIZE;
|
|
|
|
/** \brief Constructor. Provider is not set. */
|
|
QgsRasterLayer();
|
|
|
|
/** \brief 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.
|
|
*
|
|
* -
|
|
* */
|
|
QgsRasterLayer( const QString &path,
|
|
const QString &baseName = QString::null,
|
|
bool loadDefaultStyleFlag = true );
|
|
|
|
//TODO - QGIS 3.0
|
|
//This constructor is confusing if used with string literals for providerKey,
|
|
//as the previous constructor will be called with the literal for providerKey
|
|
//implicitly converted to a bool.
|
|
//for QGIS 3.0, make either constructor explicit or alter the signatures
|
|
/** \brief [ data provider interface ] Constructor in provider mode */
|
|
QgsRasterLayer( const QString &uri,
|
|
const QString &baseName,
|
|
const QString &providerKey,
|
|
bool loadDefaultStyleFlag = true );
|
|
|
|
/** \brief The destructor */
|
|
~QgsRasterLayer();
|
|
|
|
/** \brief This enumerator describes the types of shading that can be used */
|
|
enum ColorShadingAlgorithm
|
|
{
|
|
UndefinedShader,
|
|
PseudoColorShader,
|
|
FreakOutShader,
|
|
ColorRampShader,
|
|
UserDefinedShader
|
|
};
|
|
|
|
/** \brief This enumerator describes the type of raster layer */
|
|
enum LayerType
|
|
{
|
|
GrayOrUndefined,
|
|
Palette,
|
|
Multiband,
|
|
ColorLayer
|
|
};
|
|
|
|
/** 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.
|
|
*/
|
|
static bool isValidRasterFileName( const QString & theFileNameQString, QString &retError );
|
|
static bool isValidRasterFileName( const QString & theFileNameQString );
|
|
|
|
/** Return time stamp for given file name */
|
|
static QDateTime lastModified( const QString & name );
|
|
|
|
/** [ data provider interface ] Set the data provider */
|
|
void setDataProvider( const QString & provider );
|
|
|
|
/** \brief Accessor for raster layer type (which is a read only property) */
|
|
LayerType rasterType();
|
|
|
|
/** Set raster renderer. Takes ownership of the renderer object*/
|
|
void setRenderer( QgsRasterRenderer* theRenderer /Transfer/ );
|
|
QgsRasterRenderer* renderer() const;
|
|
|
|
/** Set raster resample filter. Takes ownership of the resample filter object*/
|
|
QgsRasterResampleFilter * resampleFilter() const;
|
|
|
|
QgsBrightnessContrastFilter * brightnessFilter() const;
|
|
QgsHueSaturationFilter * hueSaturationFilter() const;
|
|
|
|
/** Get raster pipe */
|
|
QgsRasterPipe * pipe();
|
|
|
|
/** \brief Accessor that returns the width of the (unclipped) raster */
|
|
int width() const;
|
|
|
|
/** \brief Accessor that returns the height of the (unclipped) raster */
|
|
int height() const;
|
|
|
|
/** \brief Get the number of bands in this layer */
|
|
int bandCount() const;
|
|
|
|
/** \brief Get the name of a band given its number */
|
|
QString bandName( int theBandNoInt ) const;
|
|
|
|
/** Returns the data provider */
|
|
QgsRasterDataProvider* dataProvider();
|
|
|
|
/** Returns the data provider in a const-correct manner
|
|
@note available in python bindings as constDataProvider()
|
|
*/
|
|
const QgsRasterDataProvider* dataProvider() const /PyName=constDataProvider/;
|
|
|
|
/** Synchronises with changes in the datasource */
|
|
virtual void reload();
|
|
|
|
/** Return new instance of QgsMapLayerRenderer that will be used for rendering of given context
|
|
* @note added in 2.4
|
|
*/
|
|
virtual QgsMapLayerRenderer* createMapRenderer( QgsRenderContext& rendererContext ) /Factory/;
|
|
|
|
/** \brief This is an overloaded version of the draw() function that is called by both draw() and thumbnailAsPixmap */
|
|
void draw( QPainter * theQPainter,
|
|
QgsRasterViewPort * myRasterViewPort,
|
|
const QgsMapToPixel* theQgsMapToPixel = 0 );
|
|
|
|
/** Returns a list with classification items (Text and color) */
|
|
QList< QPair< QString, QColor > > legendSymbologyItems() const;
|
|
|
|
virtual bool isSpatial() const;
|
|
|
|
/** \brief Obtain GDAL Metadata for this layer */
|
|
QString metadata() const;
|
|
|
|
/** \brief Get an 100x100 pixmap of the color palette. If the layer has no palette a white pixmap will be returned */
|
|
QPixmap paletteAsPixmap( int theBandNumber = 1 );
|
|
|
|
/** \brief [ data provider interface ] Which provider is being used for this Raster Layer? */
|
|
QString providerType() const;
|
|
|
|
/** \brief Returns the number of raster units per each raster pixel. In a world file, this is normally the first row (without the sign) */
|
|
double rasterUnitsPerPixelX();
|
|
double rasterUnitsPerPixelY();
|
|
|
|
/** \brief Set contrast enhancement algorithm
|
|
* @param theAlgorithm Contrast enhancement algorithm
|
|
* @param theLimits Limits
|
|
* @param theExtent Extent used to calculate limits, if empty, use full layer extent
|
|
* @param theSampleSize Size of data sample to calculate limits, if 0, use full resolution
|
|
* @param theGenerateLookupTableFlag Generate lookup table. */
|
|
|
|
|
|
void setContrastEnhancement( QgsContrastEnhancement::ContrastEnhancementAlgorithm theAlgorithm,
|
|
QgsRasterMinMaxOrigin::Limits theLimits = QgsRasterMinMaxOrigin::MinMax,
|
|
const QgsRectangle& theExtent = QgsRectangle(),
|
|
int theSampleSize = QgsRasterLayer::SAMPLE_SIZE,
|
|
bool theGenerateLookupTableFlag = true );
|
|
|
|
/** \brief Set default contrast enhancement */
|
|
void setDefaultContrastEnhancement();
|
|
|
|
/** \brief [ data provider interface ] A wrapper function to emit a progress update signal */
|
|
void showProgress( int theValue );
|
|
|
|
/** \brief Returns the sublayers of this layer - Useful for providers that manage their own layers, such as WMS */
|
|
virtual QStringList subLayers() const;
|
|
|
|
/** \brief Draws a preview of the rasterlayer into a QImage
|
|
@note added in 2.4 */
|
|
QImage previewAsImage( QSize size, const QColor& bgColor = QColor( 255, 255, 255 ),
|
|
QImage::Format format = QImage::Format_ARGB32_Premultiplied );
|
|
|
|
/**
|
|
* Reorders the *previously selected* sublayers of this layer from bottom to top
|
|
*
|
|
* (Useful for providers that manage their own layers, such as WMS)
|
|
*
|
|
*/
|
|
virtual void setLayerOrder( const QStringList &layers );
|
|
|
|
/**
|
|
* Set the visibility of the given sublayer name
|
|
*/
|
|
virtual void setSubLayerVisibility( const QString& name, bool vis );
|
|
|
|
/** Time stamp of data source in the moment when data/metadata were loaded by provider */
|
|
virtual QDateTime timestamp() const;
|
|
|
|
public slots:
|
|
void showStatusMessage( const QString & theMessage );
|
|
|
|
/** \brief receive progress signal from provider */
|
|
void onProgress( int, double, const QString& );
|
|
|
|
signals:
|
|
/** \brief Signal for notifying listeners of long running processes */
|
|
void progressUpdate( int theValue );
|
|
|
|
/**
|
|
* This is emitted whenever data or metadata (e.g. color table, extent) has changed
|
|
*/
|
|
void dataChanged();
|
|
|
|
protected:
|
|
/** \brief Read the symbology for the current layer from the Dom node supplied */
|
|
bool readSymbology( const QDomNode& node, QString& errorMessage );
|
|
|
|
/** \brief Read the style information for the current layer from the Dom node supplied */
|
|
bool readStyle(const QDomNode &node, QString &errorMessage);
|
|
|
|
/** \brief Reads layer specific state from project file Dom node */
|
|
bool readXml( const QDomNode& layer_node );
|
|
|
|
/** \brief Write the symbology for the layer into the docment provided */
|
|
bool writeSymbology( QDomNode&, QDomDocument& doc, QString& errorMessage ) const;
|
|
|
|
/** \brief Write the style for the layer into the docment provided */
|
|
bool writeStyle(QDomNode &node, QDomDocument &doc, QString &errorMessage) const;
|
|
|
|
/** \brief Write layer specific state to project file Dom node */
|
|
bool writeXml( QDomNode & layer_node, QDomDocument & doc ) const;
|
|
};
|
|
|