A class representing a matrix of values as raster data. More...

#include <qwt_matrix_raster_data.h>

Inheritance diagram for QwtMatrixRasterData:

Classes
class	PrivateData

Public Types
enum	ResampleMode { NearestNeighbour , BilinearInterpolation , BicubicInterpolation }
	Resampling algorithm. More...

Public Types inherited from QwtRasterData
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
	QwtMatrixRasterData ()
	Constructor. .

virtual	~QwtMatrixRasterData ()
	Destructor .

void	setResampleMode (ResampleMode mode)
	Set the resampling algorithm.

ResampleMode	resampleMode () const
	Return the resampling algorithm.

void	setInterval (Qt::Axis, const QwtInterval &)
	Assign the bounding interval for an axis.

virtual QwtInterval	interval (Qt::Axis axis) const override final
	Return bounding interval for an axis.

void	setValueMatrix (const QVector< double > &values, int numColumns)
	Assign a value matrix.

const QVector< double >	valueMatrix () const
	Return value matrix.

void	setValue (int row, int col, double value)
	Change a single value in the matrix.

int	numColumns () const
	Return number of columns of the value matrix.

int	numRows () const
	Return number of rows of the value matrix.

virtual QRectF	pixelHint (const QRectF &) const override
	Calculate the pixel hint.

virtual double	value (double x, double y) const override
	Return the value at a raster position.

Public Member Functions inherited from QwtRasterData
	QwtRasterData ()
	Constructor.

virtual	~QwtRasterData ()
	Destructor.

void	setAttribute (Attribute, bool on=true)
	Set an attribute.

bool	testAttribute (Attribute) const
	Test an attribute.

virtual void	initRaster (const QRectF &, const QSize &raster)
	Initialize the raster.

virtual void	discardRaster ()
	Discard the raster.

virtual ContourLines	contourLines (const QRectF &rect, const QSize &raster, const QList< double > &levels, ConrecFlags) const
	Calculate contour lines.

Detailed Description

A class representing a matrix of values as raster data.

Member Enumeration Documentation

◆ ResampleMode

enum QwtMatrixRasterData::ResampleMode

Resampling algorithm.

Enumerator
NearestNeighbour	Return the value from the matrix that is nearest to the requested position.
BilinearInterpolation	Interpolate the value from the distances and values of the 4 surrounding values in the matrix.
BicubicInterpolation	Interpolate the value from the 16 surrounding values in the matrix using hermite bicubic interpolation.

Constructor & Destructor Documentation

◆ QwtMatrixRasterData()

QwtMatrixRasterData::QwtMatrixRasterData ( )

Constructor. .

◆ ~QwtMatrixRasterData()

QwtMatrixRasterData::~QwtMatrixRasterData ( )

virtual

Destructor .

Member Function Documentation

◆ interval()

QwtInterval QwtMatrixRasterData::interval ( Qt::Axis axis ) const

finaloverridevirtual

Return bounding interval for an axis.

Implements QwtRasterData.

◆ numColumns()

int QwtMatrixRasterData::numColumns ( ) const

Return number of columns of the value matrix.

◆ numRows()

int QwtMatrixRasterData::numRows ( ) const

Return number of rows of the value matrix.

◆ pixelHint()

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

overridevirtual

Calculate the pixel hint.

Reimplemented from QwtRasterData.

◆ resampleMode()

QwtMatrixRasterData::ResampleMode QwtMatrixRasterData::resampleMode ( ) const

Return the resampling algorithm.

◆ setInterval()

void QwtMatrixRasterData::setInterval	(	Qt::Axis	axis,
		const QwtInterval &	interval
	)

Assign the bounding interval for an axis.

◆ setResampleMode()

void QwtMatrixRasterData::setResampleMode ( ResampleMode mode )

Set the resampling algorithm.

◆ setValue()

void QwtMatrixRasterData::setValue	(	int	row,
		int	col,
		double	value
	)

Change a single value in the matrix.

◆ setValueMatrix()

void QwtMatrixRasterData::setValueMatrix	(	const QVector< double > &	values,
		int	numColumns
	)

Assign a value matrix.

◆ value()

double QwtMatrixRasterData::value	(	double	x,
		double	y
	)		const