An item, which displays a spectrogram 更多...

#include <qwt_polar_spectrogram.h>

类 QwtPolarSpectrogram 继承关系图:

类
class	PrivateData

class	TileInfo

Public 类型
enum	PaintAttribute { ApproximatedAtan = 0x01 }
	Attributes to modify the drawing algorithm 更多...

Public 类型继承自 QwtPolarItem
enum	RttiValues { Rtti_PolarItem = 0 , Rtti_PolarGrid , Rtti_PolarMarker , Rtti_PolarCurve , Rtti_PolarSpectrogram , Rtti_PolarUserItem = 1000 }
	Runtime type information 更多...

enum	ItemAttribute { Legend = 0x01 , AutoScale = 0x02 }
	Plot Item Attributes 更多...

enum	RenderHint { RenderAntialiased = 0x01 }
	Render hints 更多...

Public 成员函数
	QwtPolarSpectrogram ()
	Constructor

	~QwtPolarSpectrogram () override
	Destructor

void	setData (QwtRasterData *data)
	Set the data

const QwtRasterData *	data () const
	Get the data

void	setColorMap (QwtColorMap *)
	Set the color map

const QwtColorMap *	colorMap () const
	Get the color map

void	setPaintAttribute (PaintAttribute, bool on=true)
	Set a paint attribute

bool	testPaintAttribute (PaintAttribute) const
	Test a paint attribute

virtual int	rtti () const override
	Get the runtime type information

virtual void	draw (QPainter *painter, const QwtScaleMap &azimuthMap, const QwtScaleMap &radialMap, const QPointF &pole, double radius, const QRectF &canvasRect) const override
	Draw the spectrogram

virtual QwtInterval	boundingInterval (int scaleId) const override
	Get the bounding interval for a scale

Public 成员函数继承自 QwtPolarItem
	QwtPolarItem (const QwtText &title=QwtText())
	Constructor

virtual	~QwtPolarItem ()
	Destructor

void	attach (QwtPolarPlot *plot)
	Attach the item to a plot

void	detach ()
	Detach the item from its plot

QwtPolarPlot *	plot () const
	Get the attached plot

void	setTitle (const QString &title)
	Set the title from a QString

void	setTitle (const QwtText &title)
	Set the title from a QwtText

const QwtText &	title () const
	Get the title

void	setItemAttribute (ItemAttribute, bool on=true)
	Set an item attribute

bool	testItemAttribute (ItemAttribute) const
	Test an item attribute

void	setRenderHint (RenderHint, bool on=true)
	Set a render hint

bool	testRenderHint (RenderHint) const
	Test a render hint

void	setRenderThreadCount (uint numThreads)
	Set the number of render threads

uint	renderThreadCount () const
	Get the number of render threads

double	z () const
	Get the z value

void	setZ (double z)
	Set the z value

void	show ()
	Show the item

void	hide ()
	Hide the item

virtual void	setVisible (bool)
	Set the visibility

bool	isVisible () const
	Get the visibility

virtual void	itemChanged ()
	Update the item and trigger autoRefresh

virtual void	legendChanged ()
	Update the legend

virtual void	updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &, const QwtInterval &)
	Update the scale division

virtual int	marginHint () const
	Get the margin hint

void	setLegendIconSize (const QSize &)
	Set the legend icon size

QSize	legendIconSize () const
	Get the legend icon size

virtual QList< QwtLegendData >	legendData () const
	Get the legend data

virtual QwtGraphic	legendIcon (int index, const QSizeF &) const
	Get the legend icon

Protected 成员函数
virtual QImage	renderImage (const QwtScaleMap &azimuthMap, const QwtScaleMap &radialMap, const QPointF &pole, const QRect &rect) const
	Render an image

virtual void	renderTile (const QwtScaleMap &azimuthMap, const QwtScaleMap &radialMap, const QPointF &pole, const QPoint &imagePos, const QRect &tile, QImage *image) const
	Render a tile

详细描述

An item, which displays a spectrogram

A spectrogram displays 3-dimensional data, where the 3rd dimension ( the intensity ) is displayed using colors. The colors are calculated from the values using a color map.

参见: QwtRasterData, QwtColorMap

成员枚举类型说明

◆ PaintAttribute

enum QwtPolarSpectrogram::PaintAttribute

Attributes to modify the drawing algorithm

The default setting disables ApproximatedAtan

参见: setPaintAttribute(), testPaintAttribute()

枚举值
ApproximatedAtan	Use qwtFastAtan2 instead of atan2 for translating widget into polar coordinates.

构造及析构函数说明

◆ QwtPolarSpectrogram()

QwtPolarSpectrogram::QwtPolarSpectrogram ( )

explicit

Constructor

Creates a spectrogram item with default settings.

Destructor

成员函数说明

◆ boundingInterval()

QwtInterval QwtPolarSpectrogram::boundingInterval ( int scaleId ) const

overridevirtual

Get the bounding interval for a scale

This interval can be useful for operations like clipping or autoscaling.

参数

scaleId Scale index

返回: Bounding interval ( == position )

参见: position()

重载 QwtPolarItem .

◆ colorMap()

const QwtColorMap * QwtPolarSpectrogram::colorMap ( ) const

Get the color map

Get the color map used for mapping intensity values to colors

返回: Color Map

参见: setColorMap()

◆ data()

const QwtRasterData * QwtPolarSpectrogram::data ( ) const

Get the data

Get the spectrogram data

返回: Spectrogram data

参见: setData()

◆ draw()

void QwtPolarSpectrogram::draw	(	QPainter *	painter,
		const QwtScaleMap &	azimuthMap,
		const QwtScaleMap &	radialMap,
		const QPointF &	pole,
		double	radius,
		const QRectF &	canvasRect
	)		const

overridevirtual

Draw the spectrogram

参数

painter	Painter
azimuthMap	Maps azimuth values to values related to 0.0, M_2PI
radialMap	Maps radius values into painter coordinates
pole	Position of the pole in painter coordinates
radius	Radius of the complete plot area in painter coordinates
canvasRect	Contents rect of the canvas in painter coordinates

实现了 QwtPolarItem.

◆ renderImage()

QImage QwtPolarSpectrogram::renderImage	(	const QwtScaleMap &	azimuthMap,
		const QwtScaleMap &	radialMap,
		const QPointF &	pole,
		const QRect &	rect
	)		const

protectedvirtual

Render an image

Render an image from the data and color map.

The area is translated into a rect of the paint device. For each pixel of this rect the intensity is mapped into a color.

参数

azimuthMap	Maps azimuth values to values related to 0.0, M_2PI
radialMap	Maps radius values into painter coordinates.
pole	Position of the pole in painter coordinates
rect	Target rectangle of the image in painter coordinates

返回: A QImage::Format_Indexed8 or QImage::Format_ARGB32 depending on the color map.

参见: QwtRasterData::intensity(), QwtColorMap::rgb(), QwtColorMap::colorIndex()

◆ renderTile()

void QwtPolarSpectrogram::renderTile	(	const QwtScaleMap &	azimuthMap,
		const QwtScaleMap &	radialMap,
		const QPointF &	pole,
		const QPoint &	imagePos,
		const QRect &	tile,
		QImage *	image
	)		const

protectedvirtual

Render a tile

Render a sub-rectangle of an image

renderTile() is called by renderImage() to render different parts of the image by concurrent threads.

参数

azimuthMap	Maps azimuth values to values related to 0.0, M_2PI
radialMap	Maps radius values into painter coordinates.
pole	Position of the pole in painter coordinates
imagePos	Top/left position of the image in painter coordinates
tile	Sub-rectangle of the tile in painter coordinates
image	Image to be rendered

参见: setRenderThreadCount()

注解: renderTile needs to be reentrant

◆ rtti()

int QwtPolarSpectrogram::rtti ( ) const

overridevirtual

Get the runtime type information

Get runtime type information

返回: QwtPolarItem::Rtti_PolarSpectrogram

重载 QwtPolarItem .

◆ setColorMap()

void QwtPolarSpectrogram::setColorMap ( QwtColorMap * colorMap )

Set the color map

Change the color map

Often it is useful to display the mapping between intensities and colors as an additional plot axis, showing a color bar.

参数

colorMap Color Map

参见: colorMap(), QwtScaleWidget::setColorBarEnabled(), QwtScaleWidget::setColorMap()

◆ setData()

void QwtPolarSpectrogram::setData ( QwtRasterData * data )

Set the data

Set the data to be displayed

参数

data	Spectrogram Data

参见: data()

警告: QwtRasterData::initRaster() is called each time before the image is rendered, but without any useful parameters. Also QwtRasterData::rasterHint() is not used.

◆ setPaintAttribute()

void QwtPolarSpectrogram::setPaintAttribute	(	PaintAttribute	attribute,
		bool	on = `true`
	)

Set a paint attribute

Specify an attribute how to draw the curve

参数

attribute	Paint attribute
on	On/Off

参见: testPaintAttribute()

◆ testPaintAttribute()

bool QwtPolarSpectrogram::testPaintAttribute ( PaintAttribute attribute ) const

Test a paint attribute

参数

attribute Paint attribute

返回: True when attribute has been set

参见: setPaintAttribute()

该类的文档由以下文件生成:

/home/runner/work/QWT/QWT/src/plot/qwt_polar_spectrogram.h
/home/runner/work/QWT/QWT/src/plot/qwt_polar_spectrogram.cpp

类

Public 类型

Public 成员函数

Protected 成员函数

详细描述

成员枚举类型说明

◆ PaintAttribute

构造及析构函数说明

◆ QwtPolarSpectrogram()

成员函数说明

◆ boundingInterval()

◆ colorMap()

◆ data()

◆ draw()

◆ renderImage()

◆ renderTile()

◆ rtti()

◆ setColorMap()

◆ setData()

◆ setPaintAttribute()

◆ testPaintAttribute()