QwtRasterData Class Reference

QwtRasterData defines an interface to any type of raster data. More...

#include <qwt_raster_data.h>

Inheritance diagram for QwtRasterData:

Classes
class	ContourPlane
class	PrivateData

Public Types
enum	Attribute { WithoutGaps = 0x01 }
	Raster data attributes. More...
enum	ConrecFlag { IgnoreAllVerticesOnLevel = 0x01 , IgnoreOutOfRange = 0x02 }
	Flags to modify the contour algorithm . More...
using	ContourLines = QMap< double, QPolygonF >
	Contour lines.

Public Member Functions
	QwtRasterData ()
	Constructor.
virtual	~QwtRasterData ()
	Destructor.
void	setAttribute (Attribute, bool on=true)
	Set an attribute.
bool	testAttribute (Attribute) const
	Test an attribute.
virtual QwtInterval	interval (Qt::Axis) const =0
virtual QRectF	pixelHint (const QRectF &) const
	Return a hint for the raster item, about how to align the pixels.
virtual void	initRaster (const QRectF &, const QSize &raster)
	Initialize the raster.
virtual void	discardRaster ()
	Discard the raster.
virtual double	value (double x, double y) const =0
virtual ContourLines	contourLines (const QRectF &rect, const QSize &raster, const QList< double > &levels, ConrecFlags) const
	Calculate contour lines.

Detailed Description

QwtRasterData defines an interface to any type of raster data.

Member Enumeration Documentation

Attribute

enum QwtRasterData::Attribute

Raster data attributes.

Enumerator

WithoutGaps

The bounding rectangle of the data is spanned by the interval(Qt::XAxis) and interval(Qt::YAxis). WithoutGaps indicates, that the data has no gaps ( unknown values ) in this area and the result of value() does not need to be checked for NaN values. Enabling this flag will have an positive effect on the performance of rendering a QwtPlotSpectrogram. The default setting is false. Note NaN values indicate an undefined value

ConrecFlag

enum QwtRasterData::ConrecFlag

Flags to modify the contour algorithm .

Enumerator
IgnoreAllVerticesOnLevel	Ignore all vertices on the same level.
IgnoreOutOfRange	Ignore all values, that are out of range.

Constructor & Destructor Documentation

QwtRasterData()

QwtRasterData::QwtRasterData

(

)

Constructor.

~QwtRasterData()

QwtRasterData::~QwtRasterData ( )

virtual

Destructor.

Destructor .

Member Function Documentation

contourLines()

QwtRasterData::ContourLines QwtRasterData::contourLines ( const QRectF &  rect, const QSize &  raster, const QList< double > &  levels, ConrecFlags  flags  ) const

virtual

Calculate contour lines.

discardRaster()

void QwtRasterData::discardRaster ( )

virtual

Discard the raster.

Discard a raster.

initRaster()

void QwtRasterData::initRaster ( const QRectF &  area, const QSize &  raster  )

virtual

Initialize the raster.

Initialize a raster.

interval()

virtual QwtInterval QwtRasterData::interval ( Qt::Axis  ) const

pure virtual

Implemented in QwtGridRasterData, and QwtMatrixRasterData.

pixelHint()

QRectF QwtRasterData::pixelHint ( const QRectF &  area ) const

virtual

Return a hint for the raster item, about how to align the pixels.

Pixel hint.

Reimplemented in QwtGridRasterData, and QwtMatrixRasterData.

setAttribute()

void QwtRasterData::setAttribute	(	Attribute	attribute,
		bool	on = true
	)

Set an attribute.

Specify an attribute of the data.

testAttribute()

bool QwtRasterData::testAttribute

(

Attribute

attribute

)

const

Test an attribute.

Test if an attribute is enabled.

value()

virtual double QwtRasterData::value ( double  x, double  y  ) const

pure virtual

Implemented in QwtGridRasterData, and QwtMatrixRasterData.

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

• /home/runner/work/QWT/QWT/src/plot/qwt_raster_data.h
• /home/runner/work/QWT/QWT/src/plot/qwt_raster_data.cpp