A class which draws a scale inside the plot canvas 更多...

#include <qwt_plot_scaleitem.h>

类 QwtPlotScaleItem 继承关系图:

类
class	PrivateData

Public 成员函数
	QwtPlotScaleItem (QwtScaleDraw::Alignment=QwtScaleDraw::BottomScale, const double pos=0.0)
	Constructor for scale item at the position pos

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

void	setScaleDiv (const QwtScaleDiv &)
	Assign a scale division

const QwtScaleDiv &	scaleDiv () const
	Get the scale division

void	setScaleDivFromAxis (bool on)
	Enable/Disable the synchronization of the scale division with the corresponding axis

bool	isScaleDivFromAxis () const
	Check if synchronization of the scale division with the corresponding axis is enabled

void	setPalette (const QPalette &)
	Set the palette

QPalette	palette () const
	Get the palette

void	setFont (const QFont &)
	Change the tick label font

QFont	font () const
	Get the tick label font

void	setScaleDraw (QwtScaleDraw *)
	Set a scale draw

const QwtScaleDraw *	scaleDraw () const
	Get the scale draw (const version)

QwtScaleDraw *	scaleDraw ()
	Get the scale draw

void	setPosition (double pos)
	Change the position of the scale

double	position () const
	Get the position of the scale

void	setBorderDistance (int)
	Align the scale to the canvas

int	borderDistance () const
	Get the distance from a canvas border

void	setAlignment (QwtScaleDraw::Alignment)
	Change the alignment of the scale

virtual void	draw (QPainter *, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect) const override
	Draw the scale

virtual void	updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &) override
	Update the item to changes of the axes scale division

Public 成员函数继承自 QwtPlotItem
	QwtPlotItem ()
	Default constructor

	QwtPlotItem (const QString &title)
	Constructor with title as QString

	QwtPlotItem (const QwtText &title)
	Constructor with title as QwtText

virtual	~QwtPlotItem ()
	Destructor

virtual void	attach (QwtPlot *plot)
	Attach the item to a plot

void	detach ()
	Detach the item from the plot

QwtPlot *	plot () const
	Get the plot the item is attached to

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

void	setTitle (const QwtText &title)
	Set the title using 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	setItemInterest (ItemInterest, bool on=true)
	Set an item interest

bool	testItemInterest (ItemInterest) const
	Test an item interest

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

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

QSize	legendIconSize () const
	Get the legend icon size

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
	Check if the item is visible

void	setAxes (QwtAxisId xAxis, QwtAxisId yAxis)
	Set both axes

void	setXAxis (QwtAxisId)
	Set the x-axis

QwtAxisId	xAxis () const
	Get the x-axis

void	setYAxis (QwtAxisId)
	Set the y-axis

QwtAxisId	yAxis () const
	Get the y-axis

virtual void	itemChanged ()
	Notify the plot that the item has changed

virtual void	legendChanged ()
	Notify the item that the legend has changed

virtual QRectF	boundingRect () const
	Get the bounding rectangle

virtual void	getCanvasMarginHint (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, double &left, double &top, double &right, double &bottom) const
	Get margin hints for the canvas

virtual void	updateLegend (const QwtPlotItem *, const QList< QwtLegendData > &)
	Update the item with changes of the legend

QRectF	scaleRect (const QwtScaleMap &, const QwtScaleMap &) const
	Calculate the scale rectangle

QRectF	paintRect (const QwtScaleMap &, const QwtScaleMap &) const
	Calculate the paint rectangle

virtual QList< QwtLegendData >	legendData () const
	Return legend data

virtual QwtGraphic	legendIcon (int index, const QSizeF &) const
	Return a legend icon

额外继承的成员函数
Public 类型继承自 QwtPlotItem
enum	RttiValues { Rtti_PlotItem = 0 , Rtti_PlotGrid , Rtti_PlotScale , Rtti_PlotLegend , Rtti_PlotMarker , Rtti_PlotCurve , Rtti_PlotSpectroCurve , Rtti_PlotIntervalCurve , Rtti_PlotHistogram , Rtti_PlotSpectrogram , Rtti_PlotGraphic , Rtti_PlotTradingCurve , Rtti_PlotBarChart , Rtti_PlotMultiBarChart , Rtti_PlotShape , Rtti_PlotTextLabel , Rtti_PlotZone , Rtti_PlotVectorField , Rtti_PlotArrowMarker , Rtti_PlotBoxChart , Rtti_PlotUserItem = 1000 }
	Runtime type information 更多...

enum	ItemAttribute { Legend = 0x01 , AutoScale = 0x02 , Margins = 0x04 }
	Plot Item Attributes 更多...

enum	ItemInterest { ScaleInterest = 0x01 , LegendInterest = 0x02 }
	Plot Item Interests 更多...

enum	RenderHint { RenderAntialiased = 0x1 }
	Render hints 更多...

Protected 成员函数继承自 QwtPlotItem
QwtGraphic	defaultIcon (const QBrush &, const QSizeF &) const
	Create a default icon

详细描述

A class which draws a scale inside the plot canvas

QwtPlotScaleItem can be used to draw an axis inside the plot canvas. It might be synchronized to one of the axis of the plot, but can also display its own ticks and labels.

It is allowed to synchronize the scale item with a disabled axis. In plots with vertical and horizontal scale items, it might be necessary to remove ticks at the intersections, by overloading updateScaleDiv().

     The scale might be at a specific position (e.g 0.0) or it might be aligned to a canvas border.

Example: The following example shows how to replace the left axis, by a scale item at the x position 0.0.
QwtPlotScaleItem *scaleItem = new QwtPlotScaleItem( QwtScaleDraw::RightScale, 0.0 );

scaleItem->setFont( plot->axisWidget( QwtAxis::YLeft )->font() );

scaleItem->attach(plot);

plot->setAxisVisible( QwtAxis::YLeft, false );

QwtPlotItem::plot
QwtPlot * plot() const
Get the plot the item is attached to
Definition qwt_plot_item.cpp:164

QwtPlotItem::attach
virtual void attach(QwtPlot *plot)
Attach the item to a plot
Definition qwt_plot_item.cpp:118

QwtPlotScaleItem
A class which draws a scale inside the plot canvas
Definition qwt_plot_scaleitem.h:58

QwtPlotScaleItem::setFont
void setFont(const QFont &)
Change the tick label font
Definition qwt_plot_scaleitem.cpp:208

QwtPlot::setAxisVisible
void setAxisVisible(QwtAxisId, bool on=true)
Hide or show a specified axis
Definition qwt_plot_axis.cpp:462

QwtPlot::axisWidget
const QwtScaleWidget * axisWidget(QwtAxisId) const
Return the scale widget of the specified axis
Definition qwt_plot_axis.cpp:176

QwtScaleDraw::RightScale
@ RightScale
The scale is right
Definition qwt_scale_draw.h:70

QwtAxis::YLeft
@ YLeft
Y axis left of the canvas
Definition qwt_axis.h:45

构造及析构函数说明

◆ QwtPlotScaleItem()

QwtPlotScaleItem::QwtPlotScaleItem	(	QwtScaleDraw::Alignment	alignment = `QwtScaleDraw::BottomScale`,
		const double	pos = `0.0`
	)

explicit

Constructor for scale item at the position pos

参数

[in]	alignment	In case of QwtScaleDraw::BottomScale or QwtScaleDraw::TopScale, the scale item is corresponding to the xAxis(), otherwise it corresponds to the yAxis().
[in]	pos	x or y position, depending on the corresponding axis.

参见: setPosition(), setAlignment()

Destructor

成员函数说明

◆ borderDistance()

int QwtPlotScaleItem::borderDistance ( ) const

Get the distance from a canvas border

返回: Distance from a canvas border

参见: setBorderDistance(), setPosition()

◆ draw()

void QwtPlotScaleItem::draw	(	QPainter *	painter,
		const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		const QRectF &	canvasRect
	)		const

overridevirtual

Draw the scale

参数

[in]	painter	Painter
[in]	xMap	X Scale Map
[in]	yMap	Y Scale Map
[in]	canvasRect	Contents rectangle of the canvas in painter coordinates

实现了 QwtPlotItem.

◆ font()

QFont QwtPlotScaleItem::font ( ) const

Get the tick label font

返回: Font

参见: setFont()

◆ isScaleDivFromAxis()

bool QwtPlotScaleItem::isScaleDivFromAxis ( ) const

Check if synchronization of the scale division with the corresponding axis is enabled

返回: True, if the synchronization of the scale division with the corresponding axis is enabled.

参见: setScaleDiv(), setScaleDivFromAxis()

◆ palette()

QPalette QwtPlotScaleItem::palette ( ) const

Get the palette

返回: Palette

参见: setPalette()

◆ position()

double QwtPlotScaleItem::position ( ) const

Get the position of the scale

返回: Position of the scale

参见: setPosition(), setAlignment()

◆ rtti()

int QwtPlotScaleItem::rtti ( ) const

overridevirtual

Get the runtime type information

返回: QwtPlotItem::Rtti_PlotScale

重载 QwtPlotItem .

◆ scaleDiv()

const QwtScaleDiv & QwtPlotScaleItem::scaleDiv ( ) const

Get the scale division

返回: Scale division

◆ scaleDraw() [1/2]

QwtScaleDraw * QwtPlotScaleItem::scaleDraw ( )

Get the scale draw

返回: Scale draw

参见: setScaleDraw()

◆ scaleDraw() [2/2]

const QwtScaleDraw * QwtPlotScaleItem::scaleDraw ( ) const

Get the scale draw (const version)

返回: Scale draw

参见: setScaleDraw()

◆ setAlignment()

void QwtPlotScaleItem::setAlignment ( QwtScaleDraw::Alignment alignment )

Change the alignment of the scale

参数

[in] alignment Alignment

The alignment sets the orientation of the scale and the position of the ticks:

QwtScaleDraw::BottomScale: horizontal, ticks below
QwtScaleDraw::TopScale: horizontal, ticks above
QwtScaleDraw::LeftScale: vertical, ticks left
QwtScaleDraw::RightScale: vertical, ticks right For horizontal scales the position corresponds to QwtPlotItem::yAxis(), otherwise to QwtPlotItem::xAxis().
参见
scaleDraw(), QwtScaleDraw::alignment(), setPosition()

◆ setBorderDistance()

void QwtPlotScaleItem::setBorderDistance ( int distance )

Align the scale to the canvas

参数

[in] distance Number of pixels between the canvas border and the backbone of the scale.

If distance is >= 0 the scale will be aligned to a border of the contents rectangle of the canvas. If alignment() is QwtScaleDraw::LeftScale, the scale will be aligned to the right border, if it is QwtScaleDraw::TopScale it will be aligned to the bottom (and vice versa). If distance is < 0 the scale will be at the position().

参见: setPosition(), borderDistance()

◆ setFont()

void QwtPlotScaleItem::setFont ( const QFont & font )

Change the tick label font

参数

[in] font Font

参见: font()

◆ setPalette()

void QwtPlotScaleItem::setPalette ( const QPalette & palette )

Set the palette

参数

[in] palette Palette

参见: QwtAbstractScaleDraw::draw(), palette()

◆ setPosition()

void QwtPlotScaleItem::setPosition ( double pos )

Change the position of the scale

参数

[in] pos New position

The position is interpreted as y value for horizontal axes and as x value for vertical axes. The border distance is set to -1.

参见: position(), setAlignment()

◆ setScaleDiv()

void QwtPlotScaleItem::setScaleDiv ( const QwtScaleDiv & scaleDiv )

Assign a scale division

参数

[in] scaleDiv Scale division

When assigning a scaleDiv the scale division won't be synchronized with the corresponding axis anymore.

参见: scaleDiv(), setScaleDivFromAxis(), isScaleDivFromAxis()

◆ setScaleDivFromAxis()

void QwtPlotScaleItem::setScaleDivFromAxis ( bool on )

Enable/Disable the synchronization of the scale division with the corresponding axis

参数

[in] on true/false

参见: isScaleDivFromAxis()

◆ setScaleDraw()

void QwtPlotScaleItem::setScaleDraw ( QwtScaleDraw * scaleDraw )

Set a scale draw

参数

[in] scaleDraw Object responsible for drawing scales

The main use case for replacing the default QwtScaleDraw is to overload QwtAbstractScaleDraw::label, to replace or swallow tick labels.

参见: scaleDraw()

◆ updateScaleDiv()

void QwtPlotScaleItem::updateScaleDiv	(	const QwtScaleDiv &	xScaleDiv,
		const QwtScaleDiv &	yScaleDiv
	)

overridevirtual

Update the item to changes of the axes scale division

参数

[in]	xScaleDiv	Scale division of the x-axis
[in]	yScaleDiv	Scale division of the y-axis

In case of isScaleDivFromAxis(), the scale draw is synchronized to the correspond axis.

参见: QwtPlot::updateAxes()

重载 QwtPlotItem .

该类的文档由以下文件生成:

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

类

Public 成员函数

额外继承的成员函数

详细描述

构造及析构函数说明

◆ QwtPlotScaleItem()

成员函数说明

◆ borderDistance()

◆ draw()

◆ font()

◆ isScaleDivFromAxis()

◆ palette()

◆ position()

◆ rtti()

◆ scaleDiv()

◆ scaleDraw() [1/2]

◆ scaleDraw() [2/2]

◆ setAlignment()

◆ setBorderDistance()

◆ setFont()

◆ setPalette()

◆ setPosition()

◆ setScaleDiv()

◆ setScaleDivFromAxis()

◆ setScaleDraw()

◆ updateScaleDiv()