Base class for items on a polar plot 更多...

#include <qwt_polar_item.h>

类 QwtPolarItem 继承关系图:

类
class	PrivateData

Public 类型
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
	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

virtual int	rtti () const
	Get the runtime type information

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	draw (QPainter *painter, const QwtScaleMap &azimuthMap, const QwtScaleMap &radialMap, const QPointF &pole, double radius, const QRectF &canvasRect) const =0
	Draw the item

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

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

详细描述

Base class for items on a polar plot

A QwtPolarItem is "something that can be painted on the canvas". It is connected to the QwtPolar framework by a couple of virtual methods, that are individually implemented in derived item classes. QwtPolar offers an implementation of the most common types of items, but deriving from QwtPolarItem makes it easy to implement additional types of items.

成员枚举类型说明

◆ ItemAttribute

enum QwtPolarItem::ItemAttribute

Plot Item Attributes

参见: setItemAttribute(), testItemAttribute()

枚举值
Legend	The item is represented on the legend.
AutoScale	The boundingRect() of the item is included in the autoscaling calculation.

◆ RenderHint

enum QwtPolarItem::RenderHint

Render hints

参见: setRenderHint(), testRenderHint()

枚举值
RenderAntialiased	Enable antialiasing

◆ RttiValues

enum QwtPolarItem::RttiValues

Runtime type information

RttiValues is used to cast plot items, without having to enable runtime type information of the compiler.

枚举值
Rtti_PolarItem	Unspecific value, that can be used, when it doesn't matter
Rtti_PolarGrid	For QwtPolarGrid
Rtti_PolarMarker	For QwtPolarMarker
Rtti_PolarCurve	For QwtPolarCurve
Rtti_PolarSpectrogram	For QwtPolarSpectrogram
Rtti_PolarUserItem	Values >= Rtti_PolarUserItem are reserved for plot items not implemented in the QwtPolar library.

构造及析构函数说明

◆ QwtPolarItem()

QwtPolarItem::QwtPolarItem ( const QwtText & title = QwtText() )

explicit

Constructor

参数

title Item title, f.e used on a legend

参见: setTitle()

成员函数说明

◆ attach()

void QwtPolarItem::attach ( QwtPolarPlot * plot )

Attach the item to a plot

This method will attach a QwtPolarItem to the QwtPolarPlot argument. It will first detach the QwtPolarItem from any plot from a previous call to attach (if necessary). If a nullptr argument is passed, it will detach from any QwtPolarPlot it was attached to.

参数

plot	Plot widget

参见: QwtPolarItem::detach()

◆ boundingInterval()

QwtInterval QwtPolarItem::boundingInterval ( int scaleId ) const

virtual

Get the bounding interval for a scale

Interval, that is necessary to display the item. This interval can be useful for operations like clipping or autoscaling. For items (like the grid), where a bounding interval makes no sense, an invalid interval is returned.

参数

scaleId Scale id ( QwtPolar::Scale )

返回: Bounding interval of the plot item for a specific scale

被 QwtPolarCurve, QwtPolarMarker , 以及 QwtPolarSpectrogram 重载.

◆ detach()

void QwtPolarItem::detach ( )

Detach the item from its plot

Detach the item from its associated plot

This method detaches a QwtPolarItem from the QwtPolarPlot it has been associated with. detach() is equivalent to calling attach( nullptr ).

参见: attach()

◆ draw()

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

pure virtual

Draw the item

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

在 QwtPolarCurve, QwtPolarGrid, QwtPolarMarker , 以及 QwtPolarSpectrogram 内被实现.

◆ isVisible()

bool QwtPolarItem::isVisible ( ) const

Get the visibility

Check if the item is visible

返回: true if visible

参见: setVisible(), show(), hide()

◆ itemChanged()

void QwtPolarItem::itemChanged ( )

virtual

Update the item and trigger autoRefresh

Update the legend and call QwtPolarPlot::autoRefresh for the parent plot

参见: updateLegend()

◆ legendChanged()

void QwtPolarItem::legendChanged ( )

virtual

Update the legend

Update the legend of the parent plot

参见: QwtPolarPlot::updateLegend(), itemChanged()

◆ legendData()

QList< QwtLegendData > QwtPolarItem::legendData ( ) const

virtual

Get the legend data

Return all information that is needed to represent the item on the legend

Most items are represented by one entry on the legend showing an icon and a text. QwtLegendData is basically a list of QVariants that makes it possible to overload and reimplement legendData() to return almost any type of information, that is understood by the receiver that acts as the legend. The default implementation returns one entry with the title() of the item and the legendIcon().

返回: List of legend data

参见: title(), legendIcon(), QwtLegend

◆ legendIcon()

QwtGraphic QwtPolarItem::legendIcon	(	int	index,
		const QSizeF &	size
	)		const

virtual

Get the legend icon

Get icon representing the item on the legend

The default implementation returns an invalid icon.

参数

index	Index of the legend entry (usually there is only one)
size	Icon size

返回: Icon representing the item on the legend

参见: setLegendIconSize(), legendData()

被 QwtPolarCurve 重载.

◆ legendIconSize()

QSize QwtPolarItem::legendIconSize ( ) const

Get the legend icon size

返回: Legend icon size

参见: setLegendIconSize(), legendIcon()

◆ marginHint()

int QwtPolarItem::marginHint ( ) const

virtual

Get the margin hint

Some items like to display something (f.e. the azimuth axis) outside of the area of the interval of the radial scale. The default implementation returns 0 pixels.

返回: Hint for the margin

被 QwtPolarGrid 重载.

◆ plot()

QwtPolarPlot * QwtPolarItem::plot ( ) const

Get the attached plot

返回: Attached plot

◆ renderThreadCount()

uint QwtPolarItem::renderThreadCount ( ) const

Get the number of render threads

返回: Number of threads to be used for rendering. If numThreads() is set to 0, the system specific ideal thread count is used.

◆ rtti()

int QwtPolarItem::rtti ( ) const

virtual

Get the runtime type information

Get runtime type information for the specific class represented

QwtPolarItem is simply a virtual interface class, and base classes will implement this method with specific rtti values so a user can differentiate them. The rtti value is useful for environments where the runtime type information is disabled and it is not possible to do a dynamic_cast<...>.

返回: rtti value

参见: RttiValues

被 QwtPolarCurve, QwtPolarGrid, QwtPolarMarker , 以及 QwtPolarSpectrogram 重载.

◆ setItemAttribute()

void QwtPolarItem::setItemAttribute	(	ItemAttribute	attribute,
		bool	on = `true`
	)

Set an item attribute

Toggle an item attribute

参数

attribute	Attribute type
on	true/false

参见: testItemAttribute(), ItemAttribute

◆ setLegendIconSize()

void QwtPolarItem::setLegendIconSize ( const QSize & size )

Set the legend icon size

Set the size of the legend icon

The default setting is 8x8 pixels.

参数

size Size

参见: legendIconSize(), legendIcon()

◆ setRenderHint()

void QwtPolarItem::setRenderHint	(	RenderHint	hint,
		bool	on = `true`
	)

Set a render hint

Toggle a render hint

参数

hint	Render hint
on	true/false

参见: testRenderHint(), RenderHint

◆ setRenderThreadCount()

void QwtPolarItem::setRenderThreadCount ( uint numThreads )

Set the number of render threads

On multi core systems rendering of certain plot item (f.e QwtPolarSpectrogram) can be done in parallel in several threads. The default setting is set to 1.

参数

numThreads Number of threads to be used for rendering. If numThreads is set to 0, the system specific ideal thread count is used. The default thread count is 1 ( = no additional threads ).

◆ setTitle() [1/2]

void QwtPolarItem::setTitle ( const QString & title )

Set the title from a QString

Set a new title

参数

title Title

参见: title()

◆ setTitle() [2/2]

void QwtPolarItem::setTitle ( const QwtText & title )

Set the title from a QwtText

Set a new title

参数

title Title

参见: title()

◆ setVisible()

void QwtPolarItem::setVisible ( bool on )

virtual

Set the visibility

Show/Hide the item

参数

on	Show if true, otherwise hide

参见: isVisible(), show(), hide()

◆ setZ()

void QwtPolarItem::setZ ( double z )

Set the z value

Plot items are painted in increasing z-order.

参数

z Z-value

参见: z(), QwtPolarItemDict::itemList()

◆ testItemAttribute()

bool QwtPolarItem::testItemAttribute ( ItemAttribute attribute ) const

Test an item attribute

参数

attribute Attribute type

返回: true/false

参见: setItemAttribute(), ItemAttribute

◆ testRenderHint()

bool QwtPolarItem::testRenderHint ( RenderHint hint ) const

Test a render hint

参数

hint	Render hint

返回: true/false

参见: setRenderHint(), RenderHint

◆ title()

const QwtText & QwtPolarItem::title ( ) const

Get the title

Get the title of the item

返回: Title of the item

参见: setTitle()

◆ updateScaleDiv()

void QwtPolarItem::updateScaleDiv	(	const QwtScaleDiv &	azimuthScaleDiv,
		const QwtScaleDiv &	radialScaleDiv,
		const QwtInterval &	interval
	)

virtual

Update the scale division

Update the item to changes of the axes scale division

Update the item, when the axes of plot have changed. The default implementation does nothing, but items that depend on the scale division (like QwtPolarGrid()) have to reimplement updateScaleDiv().

参数

azimuthScaleDiv	Scale division of the azimuth-scale
radialScaleDiv	Scale division of the radius-axis
interval	The interval of the radius-axis, that is visible on the canvas

参见: QwtPolarPlot::updateAxes()

被 QwtPolarGrid 重载.

◆ z()

double QwtPolarItem::z ( ) const

Get the z value

Plot items are painted in increasing z-order.

返回: Z value

参见: setZ(), QwtPolarItemDict::itemList()

该类的文档由以下文件生成:

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

类

Public 类型

Public 成员函数

详细描述

成员枚举类型说明

◆ ItemAttribute

◆ RenderHint

◆ RttiValues

构造及析构函数说明

◆ QwtPolarItem()

成员函数说明

◆ attach()

◆ boundingInterval()

◆ detach()

◆ draw()

◆ isVisible()

◆ itemChanged()

◆ legendChanged()

◆ legendData()

◆ legendIcon()

◆ legendIconSize()

◆ marginHint()

◆ plot()

◆ renderThreadCount()

◆ rtti()

◆ setItemAttribute()

◆ setLegendIconSize()

◆ setRenderHint()

◆ setRenderThreadCount()

◆ setTitle() [1/2]

◆ setTitle() [2/2]

◆ setVisible()

◆ setZ()

◆ testItemAttribute()

◆ testRenderHint()

◆ title()

◆ updateScaleDiv()

◆ z()