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

#include <qwt_matrix_raster_data.h>

类 QwtMatrixRasterData 继承关系图:

类
class	PrivateData

Public 类型
enum	ResampleMode { NearestNeighbour , BilinearInterpolation , BicubicInterpolation }
	Resampling algorithm 更多...

Public 类型继承自 QwtRasterData
enum	Attribute { WithoutGaps = 0x01 }
	Raster data attributes 更多...

enum	ConrecFlag { IgnoreAllVerticesOnLevel = 0x01 , IgnoreOutOfRange = 0x02 }
	Flags to modify the contour algorithm 更多...

using	ContourLines = QMap< double, QPolygonF >
	Contour lines

Public 成员函数
	QwtMatrixRasterData ()
	Constructor.

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 成员函数继承自 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

详细描述

A class representing a matrix of values as raster data.

QwtMatrixRasterData implements an interface for a matrix of equidistant values, that can be used by a QwtPlotRasterItem. It implements a couple of resampling algorithms, to provide values for positions, that or not on the value matrix.

成员枚举类型说明

◆ ResampleMode

enum QwtMatrixRasterData::ResampleMode

Resampling algorithm

The default setting is NearestNeighbour.

枚举值
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.

构造及析构函数说明

◆ QwtMatrixRasterData()

QwtMatrixRasterData::QwtMatrixRasterData ( )

Constructor.

Destructor

成员函数说明

◆ interval()

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

finaloverridevirtual

Return bounding interval for an axis.

参数

[in] axis Axis to query.

返回: Bounding interval for the axis.

参见: setInterval()

实现了 QwtRasterData.

◆ numColumns()

int QwtMatrixRasterData::numColumns ( ) const

Return number of columns of the value matrix.

返回: Number of columns.

参见: valueMatrix(), numRows(), setValueMatrix()

◆ numRows()

int QwtMatrixRasterData::numRows ( ) const

Return number of rows of the value matrix.

返回: Number of rows.

参见: valueMatrix(), numColumns(), setValueMatrix()

◆ pixelHint()

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

overridevirtual

Calculate the pixel hint.

pixelHint() returns the geometry of a pixel, that can be used to calculate the resolution and alignment of the plot item, that is representing the data.

NearestNeighbour: pixelHint() returns the surrounding pixel of the top left value in the matrix.
BilinearInterpolation: Returns an empty rectangle recommending to render in target device resolution.
参数

[in] area Requested area, ignored.

返回
Calculated hint.

参见
ResampleMode, setMatrix(), setInterval()

重载 QwtRasterData .

◆ resampleMode()

QwtMatrixRasterData::ResampleMode QwtMatrixRasterData::resampleMode ( ) const

Return the resampling algorithm.

返回: Resampling algorithm.

参见: setResampleMode(), value()

◆ setInterval()

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

Assign the bounding interval for an axis.

Setting the bounding intervals for the X/Y axis is mandatory to define the positions for the values of the value matrix. The interval in Z direction defines the possible range for the values in the matrix, what is f.e used by QwtPlotSpectrogram to map values to colors. The Z-interval might be the bounding interval of the values in the matrix, but usually it isn't. (f.e a interval of 0.0-100.0 for values in percentage).

参数

[in]	axis	X, Y or Z axis.
[in]	interval	Interval.

参见: QwtRasterData::interval(), setValueMatrix()

◆ setResampleMode()

void QwtMatrixRasterData::setResampleMode ( ResampleMode mode )

Set the resampling algorithm.

参数

[in] mode Resampling mode.

参见: resampleMode(), value()

◆ setValue()

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

Change a single value in the matrix.

参数

[in]	row	Row index.
[in]	col	Column index.
[in]	value	New value.

参见: value(), setValueMatrix()

◆ setValueMatrix()

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

Assign a value matrix.

The positions of the values are calculated by dividing the bounding rectangle of the X/Y intervals into equidistant rectangles (pixels). Each value corresponds to the center of a pixel.

参数

[in]	values	Vector of values.
[in]	numColumns	Number of columns.

参见: valueMatrix(), numColumns(), numRows(), setInterval()

◆ value()

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

overridevirtual

Return the value at a raster position.

参数

[in]	x	X value in plot coordinates.
[in]	y	Y value in plot coordinates.

返回: Value at the position.

参见: ResampleMode

实现了 QwtRasterData.

◆ valueMatrix()

const QVector< double > QwtMatrixRasterData::valueMatrix ( ) const

Return value matrix.

返回: Value matrix.

参见: setValueMatrix(), numColumns(), numRows(), setInterval()

该类的文档由以下文件生成:

/home/runner/work/QWT/QWT/src/core/qwt_matrix_raster_data.h
/home/runner/work/QWT/QWT/src/core/qwt_matrix_raster_data.cpp

类

Public 类型

Public 成员函数

详细描述

成员枚举类型说明

◆ ResampleMode

构造及析构函数说明

◆ QwtMatrixRasterData()

成员函数说明

◆ interval()

◆ numColumns()

◆ numRows()

◆ pixelHint()

◆ resampleMode()

◆ setInterval()

◆ setResampleMode()

◆ setValue()

◆ setValueMatrix()

◆ value()

◆ valueMatrix()