A class which draws a scale inside the plot canvas/在绘图画布内绘制刻度的类 More...

#include <qwt_plot_scaleitem.h>

Inheritance diagram for QwtPlotScaleItem:

Classes
class	PrivateData

Public Member Functions
	QwtPlotScaleItem (QwtScaleDraw::Alignment=QwtScaleDraw::BottomScale, const double pos=0.0)
	Constructor for scale item at the position pos.

virtual	~QwtPlotScaleItem ()
	Destructor.

virtual int	rtti () const QWT_OVERRIDE

void	setScaleDiv (const QwtScaleDiv &)
	Assign a scale division.

const QwtScaleDiv &	scaleDiv () const

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

bool	isScaleDivFromAxis () const

void	setPalette (const QPalette &)
	Set the palette.

QPalette	palette () const

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

QFont	font () const

void	setScaleDraw (QwtScaleDraw *)
	Set a scale draw.

const QwtScaleDraw *	scaleDraw () const

QwtScaleDraw *	scaleDraw ()

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

double	position () const

void	setBorderDistance (int)
	Align the scale to the canvas.

int	borderDistance () const

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

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

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

Public Member Functions inherited from QwtPlotItem
	QwtPlotItem ()
	Constructor.

	QwtPlotItem (const QString &title)
	Constructor.

	QwtPlotItem (const QwtText &title)
	Constructor.

virtual	~QwtPlotItem ()
	Destroy the QwtPlotItem.

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

void	detach ()
	This method detaches a QwtPlotItem from any QwtPlot it has been associated with.

QwtPlot *	plot () const
	Return attached plot.

void	setTitle (const QString &title)
	Set a new title.

void	setTitle (const QwtText &title)
	Set a new title.

const QwtText &	title () const

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

bool	testItemAttribute (ItemAttribute) const
	Test an item attribute.

void	setItemInterest (ItemInterest, bool on=true)
	Toggle an item interest.

bool	testItemInterest (ItemInterest) const
	Test an item interest.

void	setRenderHint (RenderHint, bool on=true)
	Toggle an render hint.

bool	testRenderHint (RenderHint) const
	Test a render hint.

void	setRenderThreadCount (uint numThreads)
	On multi core systems rendering of certain plot item ( f.e QwtPlotRasterItem ) can be done in parallel in several threads.

uint	renderThreadCount () const

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

QSize	legendIconSize () const

double	z () const
	Plot items are painted in increasing z-order.

void	setZ (double z)
	Set the z value.

void	show ()
	Show the item.

void	hide ()
	Hide the item.

virtual void	setVisible (bool)
	Show/Hide the item.

bool	isVisible () const

void	setAxes (QwtAxisId xAxis, QwtAxisId yAxis)
	Set X and Y axis.

void	setXAxis (QwtAxisId)
	Set the X axis.

QwtAxisId	xAxis () const
	Return xAxis.

void	setYAxis (QwtAxisId)
	Set the Y axis.

QwtAxisId	yAxis () const
	Return yAxis.

virtual void	itemChanged ()
	Update the legend and call QwtPlot::autoRefresh() for the parent plot.

virtual void	legendChanged ()
	Update the legend of the parent plot.

virtual QRectF	boundingRect () const

virtual void	getCanvasMarginHint (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, double &left, double &top, double &right, double &bottom) const
	Calculate a hint for the canvas margin.

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

QRectF	scaleRect (const QwtScaleMap &, const QwtScaleMap &) const
	Calculate the bounding scale rectangle of 2 maps.

QRectF	paintRect (const QwtScaleMap &, const QwtScaleMap &) const
	Calculate the bounding paint rectangle of 2 maps.

virtual QList< QwtLegendData >	legendData () const
	Return all information, that is needed to represent the item on the legend.

virtual QwtGraphic	legendIcon (int index, const QSizeF &) const

Additional Inherited Members
Public Types inherited from 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_PlotUserItem = 1000 }
	Runtime type information. More...

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

enum	ItemInterest { ScaleInterest = 0x01 , LegendInterest = 0x02 }
	Plot Item Interests/绘图项关注的事件类型 More...

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

Protected Member Functions inherited from QwtPlotItem
QwtGraphic	defaultIcon (const QBrush &, const QSizeF &) const
	Return a default icon from a brush.

Detailed Description

A class which draws a scale inside the plot canvas/在绘图画布内绘制刻度的类

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

QwtPlotScaleItem 可用于在绘图画布内绘制一条坐标轴。它可以与绘图的某一轴同步，也可以显示自己的刻度和标签。

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().

允许将刻度项与禁用的轴同步。在同时存在垂直和水平刻度项的绘图中，可能需要通过重载 updateScaleDiv() 方法来移除交叉点处的刻度。

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

刻度可以位于特定位置（例如 0.0），也可以与画布边缘对齐。

Example: The following example shows how to replace the left axis, by a scale item at the x position 0.0. 以下示例展示了如何用 x 位置为 0.0 处的刻度项替换左轴。
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
Return attached plot.
Definition qwt_plot_item.cpp:159

QwtPlotItem::attach
void attach(QwtPlot *plot)
Attach the item to a plot.
Definition qwt_plot_item.cpp:115

QwtPlotScaleItem
A class which draws a scale inside the plot canvas/在绘图画布内绘制刻度的类
Definition qwt_plot_scaleitem.h:64

QwtPlotScaleItem::setFont
void setFont(const QFont &)
Change the tick label font.
Definition qwt_plot_scaleitem.cpp:200

QwtPlot::setAxisVisible
void setAxisVisible(QwtAxisId, bool on=true)
Hide or show a specified axis/显示或隐藏指定轴
Definition qwt_plot_axis.cpp:488

QwtPlot::axisWidget
const QwtScaleWidget * axisWidget(QwtAxisId) const
Return the scale widget of the specified axis/返回指定轴的刻度控件
Definition qwt_plot_axis.cpp:179

QwtScaleDraw::RightScale
@ RightScale
The scale is right.
Definition qwt_scale_draw.h:71

QwtAxis::YLeft
@ YLeft
Y axis left of the canvas.
Definition qwt_axis.h:41

Constructor & Destructor Documentation

◆ QwtPlotScaleItem()

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

explicit

Constructor for scale item at the position pos.

Parameters

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

See also: setPosition(), setAlignment()

Member Function Documentation

◆ borderDistance()

int QwtPlotScaleItem::borderDistance ( ) const

Returns: Distance from a canvas border

See also: setBorderDistance(), setPosition()

◆ draw()

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

virtual

Draw the scale.

Implements QwtPlotItem.

◆ font()

QFont QwtPlotScaleItem::font ( ) const

Returns: tick label font

See also: setFont()

◆ isScaleDivFromAxis()

bool QwtPlotScaleItem::isScaleDivFromAxis ( ) const

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

See also: setScaleDiv(), setScaleDivFromAxis()

◆ palette()

QPalette QwtPlotScaleItem::palette ( ) const

Returns: palette

See also: setPalette()

◆ position()

double QwtPlotScaleItem::position ( ) const

Returns: Position of the scale

See also: setPosition(), setAlignment()

◆ rtti()

int QwtPlotScaleItem::rtti ( ) const

virtual

Returns: QwtPlotItem::Rtti_PlotScale

Reimplemented from QwtPlotItem.

◆ scaleDiv()

const QwtScaleDiv & QwtPlotScaleItem::scaleDiv ( ) const

Returns: Scale division

◆ scaleDraw() [1/2]

QwtScaleDraw * QwtPlotScaleItem::scaleDraw ( )

Returns: Scale draw

See also: setScaleDraw()

◆ scaleDraw() [2/2]

const QwtScaleDraw * QwtPlotScaleItem::scaleDraw ( ) const

Returns: Scale draw

See also: setScaleDraw()

◆ setAlignment()

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

Change the alignment of the scale.

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().

See also: scaleDraw(), QwtScaleDraw::alignment(), setPosition()

◆ setBorderDistance()

void QwtPlotScaleItem::setBorderDistance ( int distance )

Align the scale to the canvas.

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().

Parameters

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

See also: setPosition(), borderDistance()

◆ setFont()

void QwtPlotScaleItem::setFont ( const QFont & font )

Change the tick label font.

See also: font()

◆ setPalette()

void QwtPlotScaleItem::setPalette ( const QPalette & palette )

Set the palette.

See also: QwtAbstractScaleDraw::draw(), palette()

◆ setPosition()

void QwtPlotScaleItem::setPosition ( double pos )

Change the position of the scale.

The position is interpreted as y value for horizontal axes and as x value for vertical axes.

The border distance is set to -1.

Parameters

pos	New position

See also: position(), setAlignment()

◆ setScaleDiv()

void QwtPlotScaleItem::setScaleDiv ( const QwtScaleDiv & scaleDiv )

Assign a scale division.

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

Parameters

scaleDiv Scale division

See also: scaleDiv(), setScaleDivFromAxis(), isScaleDivFromAxis()

◆ setScaleDivFromAxis()

void QwtPlotScaleItem::setScaleDivFromAxis ( bool on )

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

Parameters

on	true/false

See also: isScaleDivFromAxis()

◆ setScaleDraw()

void QwtPlotScaleItem::setScaleDraw ( QwtScaleDraw * scaleDraw )

Set a scale draw.

Parameters

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.

See also: scaleDraw()

◆ updateScaleDiv()

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

virtual

Update the item to changes of the axes scale division.

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

Parameters

xScaleDiv	Scale division of the x-axis
yScaleDiv	Scale division of the y-axis

See also: QwtPlot::updateAxes()

Reimplemented from QwtPlotItem.

The documentation for this class was generated from the following files:

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

Classes

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ QwtPlotScaleItem()

Member Function Documentation

◆ borderDistance()

◆ draw()

◆ font()

◆ isScaleDivFromAxis()

◆ palette()

◆ position()

◆ rtti()

◆ scaleDiv()

◆ scaleDraw() [1/2]

◆ scaleDraw() [2/2]

◆ setAlignment()

◆ setBorderDistance()

◆ setFont()

◆ setPalette()

◆ setPosition()

◆ setScaleDiv()

◆ setScaleDivFromAxis()

◆ setScaleDraw()

◆ updateScaleDiv()