QGIS API Documentation  2.99.0-Master (f1c3692)
Classes | Public Types | Public Member Functions | Static Public Member Functions | List of all members
QgsPalettedRasterRenderer Class Reference

Renderer for paletted raster images. More...

#include <qgspalettedrasterrenderer.h>

Inheritance diagram for QgsPalettedRasterRenderer:
Inheritance graph
[legend]

Classes

struct  Class
 Properties of a single value class. More...
 

Public Types

typedef QList< QgsPalettedRasterRenderer::ClassClassData
 Map of value to class properties. More...
 
- Public Types inherited from QgsRasterInterface
enum  Capability {
  NoCapabilities = 0, Size = 1 << 1, Create = 1 << 2, Remove = 1 << 3,
  BuildPyramids = 1 << 4, Identify = 1 << 5, IdentifyValue = 1 << 6, IdentifyText = 1 << 7,
  IdentifyHtml = 1 << 8, IdentifyFeature = 1 << 9
}
 If you add to this, please also add to capabilitiesString() More...
 

Public Member Functions

 QgsPalettedRasterRenderer (QgsRasterInterface *input, int bandNumber, const ClassData &classes)
 Constructor for QgsPalettedRasterRenderer. More...
 
 QgsPalettedRasterRenderer (const QgsPalettedRasterRenderer &)=delete
 QgsPalettedRasterRenderer cannot be copied. Use clone() instead. More...
 
int band () const
 Returns the raster band used for rendering the raster. More...
 
QgsRasterBlockblock (int bandNo, const QgsRectangle &extent, int width, int height, QgsRasterBlockFeedback *feedback=nullptr) override
 Read block of data using given extent and size. More...
 
ClassData classes () const
 Returns a map of value to classes (colors) used by the renderer. More...
 
QgsPalettedRasterRendererclone () const override
 Clone itself, create deep copy. More...
 
QString label (int idx) const
 Return optional category label. More...
 
void legendSymbologyItems (QList< QPair< QString, QColor > > &symbolItems) const override
 Get symbology items if provided by renderer. More...
 
int nColors () const
 Returns number of colors. More...
 
const QgsPalettedRasterRendereroperator= (const QgsPalettedRasterRenderer &)=delete
 QgsPalettedRasterRenderer cannot be copied. Use clone() instead. More...
 
void setLabel (int idx, const QString &label)
 Set category label. More...
 
void setSourceColorRamp (QgsColorRamp *ramp)
 Set the source color ramp. More...
 
QgsColorRampsourceColorRamp () const
 Get the source color ramp. More...
 
QList< int > usesBands () const override
 Returns a list of band numbers used by the renderer. More...
 
void writeXml (QDomDocument &doc, QDomElement &parentElem) const override
 Write base class members to xml. More...
 
- Public Member Functions inherited from QgsRasterRenderer
 QgsRasterRenderer (QgsRasterInterface *input=nullptr, const QString &type=QString())
 Constructor for QgsRasterRenderer. More...
 
 QgsRasterRenderer (const QgsRasterRenderer &)=delete
 QgsRasterRenderer cannot be copied. Use clone() instead. More...
 
virtual ~QgsRasterRenderer ()
 
int alphaBand () const
 
virtual int bandCount () const override
 Get number of bands. More...
 
void copyCommonProperties (const QgsRasterRenderer *other, bool copyMinMaxOrigin=true)
 Copies common properties like opacity / transparency data from other renderer. More...
 
virtual Qgis::DataType dataType (int bandNo) const override
 Returns data type for the band specified by number. More...
 
const QgsRasterMinMaxOriginminMaxOrigin () const
 Returns const reference to origin of min/max values. More...
 
double opacity () const
 Returns the opacity for the renderer, where opacity is a value between 0 (totally transparent) and 1.0 (fully opaque). More...
 
const QgsRasterRendereroperator= (const QgsRasterRenderer &)=delete
 QgsRasterRenderer cannot be copied. Use clone() instead. More...
 
const QgsRasterTransparencyrasterTransparency () const
 
void readXml (const QDomElement &rendererElem) override
 Sets base class members from xml. Usually called from create() methods of subclasses. More...
 
void setAlphaBand (int band)
 
virtual bool setInput (QgsRasterInterface *input) override
 Set input. More...
 
void setMinMaxOrigin (const QgsRasterMinMaxOrigin &origin)
 Sets origin of min/max values. More...
 
void setOpacity (double opacity)
 Sets the opacity for the renderer, where opacity is a value between 0 (totally transparent) and 1.0 (fully opaque). More...
 
void setRasterTransparency (QgsRasterTransparency *t)
 
virtual QString type () const
 
bool usesTransparency () const
 
- Public Member Functions inherited from QgsRasterInterface
 QgsRasterInterface (QgsRasterInterface *input=nullptr)
 
virtual ~QgsRasterInterface ()=default
 
virtual QgsRasterBandStats bandStatistics (int bandNo, int stats=QgsRasterBandStats::All, const QgsRectangle &extent=QgsRectangle(), int sampleSize=0, QgsRasterBlockFeedback *feedback=nullptr)
 Get band statistics. More...
 
virtual int capabilities () const
 Returns a bitmask containing the supported capabilities. More...
 
QString capabilitiesString () const
 Returns the above in friendly format. More...
 
virtual void cumulativeCut (int bandNo, double lowerCount, double upperCount, double &lowerValue, double &upperValue, const QgsRectangle &extent=QgsRectangle(), int sampleSize=0)
 Find values for cumulative pixel count cut. More...
 
int dataTypeSize (int bandNo)
 
virtual QgsRectangle extent () const
 Get the extent of the interface. More...
 
virtual QString generateBandName (int bandNumber) const
 helper function to create zero padded band names More...
 
virtual bool hasHistogram (int bandNo, int binCount, double minimum=std::numeric_limits< double >::quiet_NaN(), double maximum=std::numeric_limits< double >::quiet_NaN(), const QgsRectangle &extent=QgsRectangle(), int sampleSize=0, bool includeOutOfRange=false)
 Returns true if histogram is available (cached, already calculated) More...
 
virtual bool hasStatistics (int bandNo, int stats=QgsRasterBandStats::All, const QgsRectangle &extent=QgsRectangle(), int sampleSize=0)
 Returns true if histogram is available (cached, already calculated). More...
 
virtual QgsRasterHistogram histogram (int bandNo, int binCount=0, double minimum=std::numeric_limits< double >::quiet_NaN(), double maximum=std::numeric_limits< double >::quiet_NaN(), const QgsRectangle &extent=QgsRectangle(), int sampleSize=0, bool includeOutOfRange=false, QgsRasterBlockFeedback *feedback=nullptr)
 Get histogram. More...
 
virtual QgsRasterInterfaceinput () const
 Current input. More...
 
virtual bool on () const
 Is on/off. More...
 
virtual void setOn (bool on)
 Set on/off. More...
 
virtual Qgis::DataType sourceDataType (int bandNo) const
 Returns source data type for the band specified by number, source data type may be shorter than dataType. More...
 
virtual const QgsRasterInterfacesourceInput () const
 Get source / raw input, the first in pipe, usually provider. More...
 
virtual QgsRasterInterfacesourceInput ()
 Get source / raw input, the first in pipe, usually provider. More...
 
virtual int xBlockSize () const
 Get block size. More...
 
virtual int xSize () const
 Get raster size. More...
 
virtual int yBlockSize () const
 
virtual int ySize () const
 

Static Public Member Functions

static QgsPalettedRasterRenderer::ClassData classDataFromFile (const QString &path)
 Opens a color table file and returns corresponding paletted renderer class data. More...
 
static QgsPalettedRasterRenderer::ClassData classDataFromRaster (QgsRasterInterface *raster, int bandNumber, QgsColorRamp *ramp=nullptr, QgsRasterBlockFeedback *feedback=nullptr)
 Generates class data from a raster, for the specified bandNumber. More...
 
static QgsPalettedRasterRenderer::ClassData classDataFromString (const QString &string)
 Converts a string containing a color table or class data to to paletted renderer class data. More...
 
static QString classDataToString (const QgsPalettedRasterRenderer::ClassData &classes)
 Converts classes to a string representation, using the .clr/gdal color table file format. More...
 
static QgsPalettedRasterRenderer::ClassData colorTableToClassData (const QList< QgsColorRampShader::ColorRampItem > &table)
 Converts a raster color table to paletted renderer class data. More...
 
static QgsRasterRenderercreate (const QDomElement &elem, QgsRasterInterface *input)
 

Additional Inherited Members

- Static Public Attributes inherited from QgsRasterRenderer
static const QRgb NODATA_COLOR = qRgba( 0, 0, 0, 0 )
 
- Protected Member Functions inherited from QgsRasterRenderer
void _writeXml (QDomDocument &doc, QDomElement &rasterRendererElem) const
 Write upper class info into rasterrenderer element (called by writeXml method of subclasses) More...
 
- Protected Member Functions inherited from QgsRasterInterface
void initHistogram (QgsRasterHistogram &histogram, int bandNo, int binCount, double minimum=std::numeric_limits< double >::quiet_NaN(), double maximum=std::numeric_limits< double >::quiet_NaN(), const QgsRectangle &boundingBox=QgsRectangle(), int sampleSize=0, bool includeOutOfRange=false)
 Fill in histogram defaults if not specified. More...
 
void initStatistics (QgsRasterBandStats &statistics, int bandNo, int stats=QgsRasterBandStats::All, const QgsRectangle &boundingBox=QgsRectangle(), int binCount=0)
 Fill in statistics defaults if not specified. More...
 
- Protected Attributes inherited from QgsRasterRenderer
int mAlphaBand = -1
 Read alpha value from band. More...
 
QgsRasterMinMaxOrigin mMinMaxOrigin
 Origin of min/max values. More...
 
double mOpacity = 1.0
 Global alpha value (0-1) More...
 
QgsRasterTransparencymRasterTransparency = nullptr
 Raster transparency per color or value. Overwrites global alpha value. More...
 
QString mType
 
- Protected Attributes inherited from QgsRasterInterface
QList< QgsRasterHistogrammHistograms
 List of cached histograms, all bands mixed. More...
 
QgsRasterInterfacemInput = nullptr
 
bool mOn = true
 
QList< QgsRasterBandStatsmStatistics
 List of cached statistics, all bands mixed. More...
 

Detailed Description

Renderer for paletted raster images.

Definition at line 35 of file qgspalettedrasterrenderer.h.

Member Typedef Documentation

◆ ClassData

Map of value to class properties.

Definition at line 59 of file qgspalettedrasterrenderer.h.

Constructor & Destructor Documentation

◆ QgsPalettedRasterRenderer() [1/2]

QgsPalettedRasterRenderer::QgsPalettedRasterRenderer ( QgsRasterInterface input,
int  bandNumber,
const ClassData classes 
)

Constructor for QgsPalettedRasterRenderer.

Definition at line 30 of file qgspalettedrasterrenderer.cpp.

◆ QgsPalettedRasterRenderer() [2/2]

QgsPalettedRasterRenderer::QgsPalettedRasterRenderer ( const QgsPalettedRasterRenderer )
delete

QgsPalettedRasterRenderer cannot be copied. Use clone() instead.

Member Function Documentation

◆ band()

int QgsPalettedRasterRenderer::band ( ) const
inline

Returns the raster band used for rendering the raster.

Since
QGIS 3.0

Definition at line 98 of file qgspalettedrasterrenderer.h.

◆ block()

QgsRasterBlock * QgsPalettedRasterRenderer::block ( int  bandNo,
const QgsRectangle extent,
int  width,
int  height,
QgsRasterBlockFeedback feedback = nullptr 
)
overridevirtual

Read block of data using given extent and size.

Returns pointer to data. Caller is responsible to free the memory returned.

Parameters
bandNoband number
extentextent of block
widthpixel width of block
heightpixel height of block
feedbackoptional raster feedback object for cancelation/preview. Added in QGIS 3.0.

Implements QgsRasterRenderer.

Definition at line 122 of file qgspalettedrasterrenderer.cpp.

◆ classDataFromFile()

QgsPalettedRasterRenderer::ClassData QgsPalettedRasterRenderer::classDataFromFile ( const QString &  path)
static

Opens a color table file and returns corresponding paletted renderer class data.

Since
QGIS 3.0
See also
classDataFromString()

Definition at line 367 of file qgspalettedrasterrenderer.cpp.

◆ classDataFromRaster()

QgsPalettedRasterRenderer::ClassData QgsPalettedRasterRenderer::classDataFromRaster ( QgsRasterInterface raster,
int  bandNumber,
QgsColorRamp ramp = nullptr,
QgsRasterBlockFeedback feedback = nullptr 
)
static

Generates class data from a raster, for the specified bandNumber.

An optional color ramp can be specified to automatically assign colors from the ramp.

Since
QGIS 3.0

Definition at line 398 of file qgspalettedrasterrenderer.cpp.

◆ classDataFromString()

QgsPalettedRasterRenderer::ClassData QgsPalettedRasterRenderer::classDataFromString ( const QString &  string)
static

Converts a string containing a color table or class data to to paletted renderer class data.

Since
QGIS 3.0
See also
classDataFromFile()
classDataToString()

Definition at line 288 of file qgspalettedrasterrenderer.cpp.

◆ classDataToString()

QString QgsPalettedRasterRenderer::classDataToString ( const QgsPalettedRasterRenderer::ClassData classes)
static

Converts classes to a string representation, using the .clr/gdal color table file format.

Since
QGIS 3.0
See also
classDataFromString()

Definition at line 380 of file qgspalettedrasterrenderer.cpp.

◆ classes()

QgsPalettedRasterRenderer::ClassData QgsPalettedRasterRenderer::classes ( ) const

Returns a map of value to classes (colors) used by the renderer.

Definition at line 93 of file qgspalettedrasterrenderer.cpp.

◆ clone()

QgsPalettedRasterRenderer * QgsPalettedRasterRenderer::clone ( ) const
overridevirtual

Clone itself, create deep copy.

Implements QgsRasterRenderer.

Definition at line 38 of file qgspalettedrasterrenderer.cpp.

◆ colorTableToClassData()

QgsPalettedRasterRenderer::ClassData QgsPalettedRasterRenderer::colorTableToClassData ( const QList< QgsColorRampShader::ColorRampItem > &  table)
static

Converts a raster color table to paletted renderer class data.

Since
QGIS 3.0

Definition at line 276 of file qgspalettedrasterrenderer.cpp.

◆ create()

QgsRasterRenderer * QgsPalettedRasterRenderer::create ( const QDomElement &  elem,
QgsRasterInterface input 
)
static

Definition at line 48 of file qgspalettedrasterrenderer.cpp.

◆ label()

QString QgsPalettedRasterRenderer::label ( int  idx) const

Return optional category label.

Since
QGIS 2.1

Definition at line 98 of file qgspalettedrasterrenderer.cpp.

◆ legendSymbologyItems()

void QgsPalettedRasterRenderer::legendSymbologyItems ( QList< QPair< QString, QColor > > &  symbolItems) const
overridevirtual

Get symbology items if provided by renderer.

Reimplemented from QgsRasterRenderer.

Definition at line 246 of file qgspalettedrasterrenderer.cpp.

◆ nColors()

int QgsPalettedRasterRenderer::nColors ( ) const
inline

Returns number of colors.

Definition at line 77 of file qgspalettedrasterrenderer.h.

◆ operator=()

const QgsPalettedRasterRenderer& QgsPalettedRasterRenderer::operator= ( const QgsPalettedRasterRenderer )
delete

QgsPalettedRasterRenderer cannot be copied. Use clone() instead.

◆ setLabel()

void QgsPalettedRasterRenderer::setLabel ( int  idx,
const QString &  label 
)

Set category label.

Since
QGIS 2.1

Definition at line 109 of file qgspalettedrasterrenderer.cpp.

◆ setSourceColorRamp()

void QgsPalettedRasterRenderer::setSourceColorRamp ( QgsColorRamp ramp)

Set the source color ramp.

Ownership is transferred to the renderer.

Since
QGIS 3.0
See also
sourceColorRamp()

Definition at line 266 of file qgspalettedrasterrenderer.cpp.

◆ sourceColorRamp()

QgsColorRamp * QgsPalettedRasterRenderer::sourceColorRamp ( ) const

Get the source color ramp.

Since
QGIS 3.0
See also
setSourceColorRamp()

Definition at line 271 of file qgspalettedrasterrenderer.cpp.

◆ usesBands()

QList< int > QgsPalettedRasterRenderer::usesBands ( ) const
overridevirtual

Returns a list of band numbers used by the renderer.

Reimplemented from QgsRasterRenderer.

Definition at line 256 of file qgspalettedrasterrenderer.cpp.

◆ writeXml()

void QgsPalettedRasterRenderer::writeXml ( QDomDocument &  doc,
QDomElement &  parentElem 
) const
overridevirtual

Write base class members to xml.

Reimplemented from QgsRasterInterface.

Definition at line 208 of file qgspalettedrasterrenderer.cpp.


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