A class that encapsulates grid data and provides interpolation methods. 更多...

#include <qwt_grid_raster_data.h>

类 QwtGridRasterData 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
	QwtGridRasterData ()
	Constructor.

void	setResampleMode (ResampleMode mode)
	Set the resample method.

ResampleMode	resampleMode () const
	Get the current resample method.

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

void	setValue (const QVector< double > &x, const QVector< double > &y, const QVector< QVector< double > > &v)
	Set new x-axis, y-axis, and data matrix

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

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

int	xSize () const
	Return the size of x-axis.

int	ySize () const
	Return the size of y-axis.

std::pair< int, int >	valueSize () const
	Return the size of the value matrix.

double	atValue (int xIndex, int yIndex) const
	Return the value at specified position in the value matrix.

double	atX (int xIndex) const
	Return the x-axis value at specified index.

double	atY (int yIndex) const
	Return the y-axis value at specified index.

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 that encapsulates grid data and provides interpolation methods.

This class inherits from QwtRasterData and is used to represent 2D grid data. It supports various interpolation methods such as nearest neighbor and bilinear interpolation.

成员枚举类型说明

◆ ResampleMode

enum QwtGridRasterData::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

◆ QwtGridRasterData()

QwtGridRasterData::QwtGridRasterData ( )

Constructor.

Destructor

成员函数说明

◆ atValue()

double QwtGridRasterData::atValue	(	int	xIndex,
		int	yIndex
	)		const

Return the value at specified position in the value matrix.

参数

[in]	xIndex	X index.
[in]	yIndex	Y index.

返回: Value at the position.

◆ atX()

double QwtGridRasterData::atX ( int xIndex ) const

Return the x-axis value at specified index.

参数

[in] xIndex X index.

返回: X-axis value.

◆ atY()

double QwtGridRasterData::atY ( int yIndex ) const

Return the y-axis value at specified index.

参数

[in] yIndex Y index.

返回: Y-axis value.

◆ interval()

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

finaloverridevirtual

Return bounding interval for an axis

参数

[in] axis Axis to query (X, Y, or Z)

返回: Bounding interval for the axis

实现了 QwtRasterData.

◆ pixelHint()

QRectF QwtGridRasterData::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 representing the data. For NearestNeighbour mode, returns the surrounding pixel. For other modes, returns an empty rectangle.

参数

[in] area Requested area (ignored)

返回: Calculated hint rectangle

重载 QwtRasterData .

◆ resampleMode()

QwtGridRasterData::ResampleMode QwtGridRasterData::resampleMode ( ) const

Get the current resample method.

返回: The current resample method.

参见: setResampleMode(), value()

◆ setResampleMode()

void QwtGridRasterData::setResampleMode ( QwtGridRasterData::ResampleMode mode )

Set the resample method.

Sets the resample method to be used when querying values.

参数

[in] mode The resample method to use.

参见: resampleMode(), value()

◆ setValue()

void QwtGridRasterData::setValue	(	const QVector< double > &	x,
		const QVector< double > &	y,
		const QVector< QVector< double > > &	v
	)

Set new x-axis, y-axis, and data matrix

The data matrix layout:

data matrix.size = xAxis.size
data matrix.at(n).size = yAxis.size
参数

[in] x The x-axis values

[in] y The y-axis values

[in] v The 2D data matrix

◆ value()

double QwtGridRasterData::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, or NaN if outside bounds

实现了 QwtRasterData.

◆ valueSize()

std::pair< int, int > QwtGridRasterData::valueSize ( ) const

Return the size of the value matrix.

返回: Pair of (xSize, ySize).

◆ xSize()

int QwtGridRasterData::xSize ( ) const

Return the size of x-axis.

返回: Size of x-axis.

◆ ySize()

int QwtGridRasterData::ySize ( ) const

Return the size of y-axis.

返回: Size of y-axis.

该类的文档由以下文件生成:

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

[in]	x	The x-axis values
[in]	y	The y-axis values
[in]	v	The 2D data matrix

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

◆ QwtGridRasterData()

成员函数说明

◆ atValue()

◆ atX()

◆ atY()

◆ interval()

◆ pixelHint()

◆ resampleMode()

◆ setResampleMode()

◆ setValue()

◆ value()

◆ valueSize()

◆ xSize()

◆ ySize()