QGIS API Documentation  3.21.0-Master (5b68dc587e)
Public Member Functions | Static Public Member Functions | List of all members
QgsRasterContourRenderer Class Reference

Raster renderer that generates contours on the fly for a source raster band. More...

#include <qgsrastercontourrenderer.h>

Inheritance diagram for QgsRasterContourRenderer:
Inheritance graph
[legend]

Public Member Functions

 QgsRasterContourRenderer (const QgsRasterContourRenderer &)=delete
 QgsRasterContourRenderer cannot be copied. Use clone() instead. More...
 
 QgsRasterContourRenderer (QgsRasterInterface *input)
 Creates a contour renderer. More...
 
 ~QgsRasterContourRenderer () override
 
QgsRasterBlockblock (int bandNo, const QgsRectangle &extent, int width, int height, QgsRasterBlockFeedback *feedback=nullptr) override
 Read block of data using given extent and size. More...
 
QgsRasterContourRendererclone () const override
 Clone itself, create deep copy. More...
 
double contourIndexInterval () const
 Returns the interval of index contour lines (index contour lines are typical further apart and with a wider line symbol) More...
 
QgsLineSymbolcontourIndexSymbol () const
 Returns the symbol of index contour lines. More...
 
double contourInterval () const
 Returns the interval of contour lines generation. More...
 
QgsLineSymbolcontourSymbol () const
 Returns the symbol used for contour lines. More...
 
QList< QgsLayerTreeModelLegendNode * > createLegendNodes (QgsLayerTreeLayer *nodeLayer) override
 Creates a set of legend nodes representing the renderer. More...
 
double downscale () const
 Returns by how much the renderer will scale down the request to the data provider. More...
 
int inputBand () const
 Returns the number of the input raster band. More...
 
const QgsRasterContourRendereroperator= (const QgsRasterContourRenderer &)=delete
 QgsRasterContourRenderer cannot be copied. Use clone() instead. More...
 
void setContourIndexInterval (double interval)
 Sets the interval of index contour lines (index contour lines are typical further apart and with a wider line symbol) More...
 
void setContourIndexSymbol (QgsLineSymbol *symbol)
 Sets the symbol of index contour lines. More...
 
void setContourInterval (double interval)
 Sets the interval of contour lines generation. More...
 
void setContourSymbol (QgsLineSymbol *symbol)
 Sets the symbol used for contour lines. Takes ownership of the passed symbol. More...
 
void setDownscale (double scale)
 Sets by how much the renderer will scale down the request to the data provider. More...
 
void setInputBand (int band)
 Sets the number of the input raster band. 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 (const QgsRasterRenderer &)=delete
 QgsRasterRenderer cannot be copied. Use clone() instead. More...
 
 QgsRasterRenderer (QgsRasterInterface *input=nullptr, const QString &type=QString())
 Constructor for QgsRasterRenderer. More...
 
 ~QgsRasterRenderer () override
 
virtual bool accept (QgsStyleEntityVisitorInterface *visitor) const
 Accepts the specified symbology visitor, causing it to visit all symbols associated with the renderer. More...
 
int alphaBand () const
 
int bandCount () const override
 Gets number of bands. More...
 
void copyCommonProperties (const QgsRasterRenderer *other, bool copyMinMaxOrigin=true)
 Copies common properties like opacity / transparency data from other renderer. More...
 
Qgis::DataType dataType (int bandNo) const override
 Returns data type for the band specified by number. More...
 
virtual QList< QPair< QString, QColor > > legendSymbologyItems () const
 Returns symbology items if provided by renderer. More...
 
const QgsRasterMinMaxOriginminMaxOrigin () const
 Returns const reference to origin of min/max values. More...
 
QColor nodataColor () const
 Returns the color to use for shading nodata pixels. 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)
 
bool setInput (QgsRasterInterface *input) override
 Set input. More...
 
void setMinMaxOrigin (const QgsRasterMinMaxOrigin &origin)
 Sets origin of min/max values. More...
 
void setNodataColor (const QColor &color)
 Sets the color to use for shading nodata pixels. 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 void toSld (QDomDocument &doc, QDomElement &element, const QVariantMap &props=QVariantMap()) const
 Used from subclasses to create SLD Rule elements following SLD v1.0 specs. More...
 
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)
 Returns the band statistics. More...
 
virtual int capabilities () const
 Returns a bitmask containing the supported capabilities. More...
 
QString capabilitiesString () const
 Returns the raster interface capabilities in friendly format. More...
 
virtual QString colorInterpretationName (int bandNumber) const
 Returns the name of the color interpretation for the specified bandNumber. 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) const
 Returns the size (in bytes) for the data type for the specified band. More...
 
QString displayBandName (int bandNumber) const
 Generates a friendly, descriptive name for the specified bandNumber. More...
 
virtual QgsRectangle extent () const
 Gets 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)
 Returns a band histogram. More...
 
virtual QgsRasterInterfaceinput () const
 Current input. More...
 
virtual bool on () const
 Returns whether the interface is on or off. More...
 
virtual void setOn (bool on)
 Sets whether the interface is on or 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 QgsRasterInterfacesourceInput ()
 Gets source / raw input, the first in pipe, usually provider. More...
 
virtual const QgsRasterInterfacesourceInput () const
 Gets source / raw input, the first in pipe, usually provider. More...
 
virtual int xBlockSize () const
 Gets block size. More...
 
virtual int xSize () const
 Gets raster size. More...
 
virtual int yBlockSize () const
 
virtual int ySize () const
 

Static Public Member Functions

static QgsRasterRenderercreate (const QDomElement &elem, QgsRasterInterface *input)
 Creates an instance of the renderer based on definition from XML (used by renderer registry) More...
 

Additional Inherited Members

- 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 , Prefetch = 1 << 10
}
 If you add to this, please also add to capabilitiesString() More...
 
- 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...
 
QRgb renderColorForNodataPixel () const
 Returns the color for the renderer to use to represent nodata pixels. 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

Raster renderer that generates contours on the fly for a source raster band.

Since
QGIS 3.14

Definition at line 30 of file qgsrastercontourrenderer.h.

Constructor & Destructor Documentation

◆ QgsRasterContourRenderer() [1/2]

QgsRasterContourRenderer::QgsRasterContourRenderer ( QgsRasterInterface input)
explicit

Creates a contour renderer.

Definition at line 26 of file qgsrastercontourrenderer.cpp.

◆ ~QgsRasterContourRenderer()

QgsRasterContourRenderer::~QgsRasterContourRenderer ( )
overridedefault

◆ QgsRasterContourRenderer() [2/2]

QgsRasterContourRenderer::QgsRasterContourRenderer ( const QgsRasterContourRenderer )
delete

QgsRasterContourRenderer cannot be copied. Use clone() instead.

Member Function Documentation

◆ block()

QgsRasterBlock * QgsRasterContourRenderer::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 cancellation/preview. Added in QGIS 3.0.

Implements QgsRasterRenderer.

Definition at line 140 of file qgsrastercontourrenderer.cpp.

◆ clone()

QgsRasterContourRenderer * QgsRasterContourRenderer::clone ( ) const
overridevirtual

Clone itself, create deep copy.

Implements QgsRasterRenderer.

Definition at line 34 of file qgsrastercontourrenderer.cpp.

◆ contourIndexInterval()

double QgsRasterContourRenderer::contourIndexInterval ( ) const
inline

Returns the interval of index contour lines (index contour lines are typical further apart and with a wider line symbol)

Definition at line 72 of file qgsrastercontourrenderer.h.

◆ contourIndexSymbol()

QgsLineSymbol* QgsRasterContourRenderer::contourIndexSymbol ( ) const
inline

Returns the symbol of index contour lines.

Definition at line 77 of file qgsrastercontourrenderer.h.

◆ contourInterval()

double QgsRasterContourRenderer::contourInterval ( ) const
inline

Returns the interval of contour lines generation.

Definition at line 62 of file qgsrastercontourrenderer.h.

◆ contourSymbol()

QgsLineSymbol* QgsRasterContourRenderer::contourSymbol ( ) const
inline

Returns the symbol used for contour lines.

Definition at line 67 of file qgsrastercontourrenderer.h.

◆ create()

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

Creates an instance of the renderer based on definition from XML (used by renderer registry)

Definition at line 47 of file qgsrastercontourrenderer.cpp.

◆ createLegendNodes()

QList< QgsLayerTreeModelLegendNode * > QgsRasterContourRenderer::createLegendNodes ( QgsLayerTreeLayer nodeLayer)
overridevirtual

Creates a set of legend nodes representing the renderer.

The default implementation calls legendSymbologyItems() and creates corresponding legend nodes for each returned symbology item.

Subclasses can override this to return more legend nodes which better represent the renderer.

Since
QGIS 3.18

Reimplemented from QgsRasterRenderer.

Definition at line 220 of file qgsrastercontourrenderer.cpp.

◆ downscale()

double QgsRasterContourRenderer::downscale ( ) const
inline

Returns by how much the renderer will scale down the request to the data provider.

For example, for a raster block 1000x500 with downscale 10, the renderer will request raster 100x50 from provider. Higher downscale makes contour lines more simplified (at the expense of losing some detail). The value of one means there will be no downscaling.

Definition at line 87 of file qgsrastercontourrenderer.h.

◆ inputBand()

int QgsRasterContourRenderer::inputBand ( ) const
inline

Returns the number of the input raster band.

Definition at line 57 of file qgsrastercontourrenderer.h.

◆ operator=()

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

QgsRasterContourRenderer cannot be copied. Use clone() instead.

◆ setContourIndexInterval()

void QgsRasterContourRenderer::setContourIndexInterval ( double  interval)
inline

Sets the interval of index contour lines (index contour lines are typical further apart and with a wider line symbol)

Definition at line 74 of file qgsrastercontourrenderer.h.

◆ setContourIndexSymbol()

void QgsRasterContourRenderer::setContourIndexSymbol ( QgsLineSymbol symbol)

Sets the symbol of index contour lines.

Definition at line 241 of file qgsrastercontourrenderer.cpp.

◆ setContourInterval()

void QgsRasterContourRenderer::setContourInterval ( double  interval)
inline

Sets the interval of contour lines generation.

Definition at line 64 of file qgsrastercontourrenderer.h.

◆ setContourSymbol()

void QgsRasterContourRenderer::setContourSymbol ( QgsLineSymbol symbol)

Sets the symbol used for contour lines. Takes ownership of the passed symbol.

Definition at line 236 of file qgsrastercontourrenderer.cpp.

◆ setDownscale()

void QgsRasterContourRenderer::setDownscale ( double  scale)
inline

Sets by how much the renderer will scale down the request to the data provider.

See also
downscale()

Definition at line 93 of file qgsrastercontourrenderer.h.

◆ setInputBand()

void QgsRasterContourRenderer::setInputBand ( int  band)
inline

Sets the number of the input raster band.

Definition at line 59 of file qgsrastercontourrenderer.h.

◆ usesBands()

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

Returns a list of band numbers used by the renderer.

Reimplemented from QgsRasterRenderer.

Definition at line 210 of file qgsrastercontourrenderer.cpp.

◆ writeXml()

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

Write base class members to xml.

Reimplemented from QgsRasterInterface.

Definition at line 87 of file qgsrastercontourrenderer.cpp.


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