QwtPlotRescaler takes care of fixed aspect ratios for plot scales 更多...

#include <qwt_plot_rescaler.h>

类 QwtPlotRescaler 继承关系图:

类
class	AxisData

class	PrivateData

Public 类型
enum	RescalePolicy { Fixed , Expanding , Fitting }
	Rescale policies 更多...

enum	ExpandingDirection { ExpandUp , ExpandDown , ExpandBoth }
	Expanding directions 更多...

Public 成员函数
	QwtPlotRescaler (QWidget *canvas, QwtAxisId referenceAxis=QwtAxis::XBottom, RescalePolicy=Expanding)
	Constructs a rescaler for the given canvas

void	setEnabled (bool)
	Enables or disables the rescaler

bool	isEnabled () const
	Checks if the rescaler is enabled

void	setRescalePolicy (RescalePolicy)
	Sets the rescale policy

RescalePolicy	rescalePolicy () const
	Gets the rescale policy

void	setExpandingDirection (ExpandingDirection)
	Sets the expanding direction for all axes

void	setExpandingDirection (QwtAxisId, ExpandingDirection)
	Sets the expanding direction for a specific axis

ExpandingDirection	expandingDirection (QwtAxisId) const
	Gets the expanding direction for a specific axis

void	setReferenceAxis (QwtAxisId)
	Sets the reference axis

QwtAxisId	referenceAxis () const
	Gets the reference axis

void	setAspectRatio (double ratio)
	Sets the aspect ratio for all axes

void	setAspectRatio (QwtAxisId, double ratio)
	Sets the aspect ratio for a specific axis

double	aspectRatio (QwtAxisId) const
	Gets the aspect ratio for a specific axis

void	setIntervalHint (QwtAxisId, const QwtInterval &)
	Sets an interval hint for an axis

QwtInterval	intervalHint (QwtAxisId) const
	Gets the interval hint for an axis

QWidget *	canvas ()
	Gets the canvas widget

const QWidget *	canvas () const
	Gets the canvas widget (const version)

QwtPlot *	plot ()
	Gets the plot widget

const QwtPlot *	plot () const
	Gets the plot widget (const version)

virtual bool	eventFilter (QObject , QEvent ) override
	Event filter for the plot canvas

void	rescale () const
	Rescales the plot axes

Protected 成员函数
virtual void	canvasResizeEvent (QResizeEvent *)
	Event handler for resize events of the plot canvas

virtual void	rescale (const QSize &oldSize, const QSize &newSize) const
	Adjust the plot axes scales

virtual QwtInterval	expandScale (QwtAxisId, const QSize &oldSize, const QSize &newSize) const
	Calculate the new scale interval of a plot axis

virtual QwtInterval	syncScale (QwtAxisId, const QwtInterval &reference, const QSize &size) const
	Synchronize an axis scale according to the scale of the reference axis

virtual void	updateScales (QwtInterval intervals[QwtAxis::AxisPositions]) const
	Update the axes scales

Qt::Orientation	orientation (QwtAxisId) const

QwtInterval	interval (QwtAxisId) const

QwtInterval	expandInterval (const QwtInterval &, double width, ExpandingDirection) const
	Expand the interval

详细描述

QwtPlotRescaler takes care of fixed aspect ratios for plot scales

QwtPlotRescaler auto adjusts the axes of a QwtPlot according to fixed aspect ratios.

成员枚举类型说明

◆ ExpandingDirection

enum QwtPlotRescaler::ExpandingDirection

Expanding directions

When rescalePolicy() is set to Expanding its direction depends on ExpandingDirection

枚举值
ExpandUp	The upper limit of the scale is adjusted
ExpandDown	The lower limit of the scale is adjusted
ExpandBoth	Both limits of the scale are adjusted

◆ RescalePolicy

enum QwtPlotRescaler::RescalePolicy

Rescale policies

The rescale policy defines how to rescale the reference axis and their depending axes.

参见: ExpandingDirection, setIntervalHint()

枚举值

Fixed

The interval of the reference axis remains unchanged, when the geometry of the canvas changes. All other axes will be adjusted according to their aspect ratio.

Expanding

The interval of the reference axis will be shrunk/expanded, when the geometry of the canvas changes. All other axes will be adjusted according to their aspect ratio.

The interval, that is represented by one pixel is fixed.

Fitting

The intervals of the axes are calculated, so that all axes include their interval hint.

构造及析构函数说明

◆ QwtPlotRescaler()

QwtPlotRescaler::QwtPlotRescaler	(	QWidget *	canvas,
		QwtAxisId	referenceAxis = `QwtAxis::XBottom`,
		RescalePolicy	policy = `Expanding`
	)

explicit

Constructs a rescaler for the given canvas

参数

[in]	canvas	Canvas widget
[in]	referenceAxis	Reference axis, see RescalePolicy
[in]	policy	Rescale policy

参见: setRescalePolicy(), setReferenceAxis()

Destructs the rescaler

成员函数说明

◆ aspectRatio()

double QwtPlotRescaler::aspectRatio ( QwtAxisId axisId ) const

Gets the aspect ratio for a specific axis

参数

[in] axisId Axis identifier

返回: Aspect ratio between the specified axis and the reference axis

参见: setAspectRatio()

◆ canvas() [1/2]

QWidget * QwtPlotRescaler::canvas ( )

Gets the canvas widget

返回: Canvas widget

◆ canvas() [2/2]

const QWidget * QwtPlotRescaler::canvas ( ) const

Gets the canvas widget (const version)

返回: Canvas widget (const)

◆ canvasResizeEvent()

void QwtPlotRescaler::canvasResizeEvent ( QResizeEvent * event )

protectedvirtual

Event handler for resize events of the plot canvas

参数

event Resize event

参见: rescale()

◆ eventFilter()

bool QwtPlotRescaler::eventFilter	(	QObject *	object,
		QEvent *	event
	)

overridevirtual

Event filter for the plot canvas

Handles resize and polish request events for the canvas.

参数

[in]	object	Object that received the event
[in]	event	Event that was received

返回: false to allow further processing of the event

◆ expandingDirection()

QwtPlotRescaler::ExpandingDirection QwtPlotRescaler::expandingDirection ( QwtAxisId axisId ) const

Gets the expanding direction for a specific axis

参数

[in] axisId Axis identifier

返回: Expanding direction for the specified axis

参见: setExpandingDirection()

◆ expandInterval()

QwtInterval QwtPlotRescaler::expandInterval	(	const QwtInterval &	interval,
		double	width,
		ExpandingDirection	direction
	)		const

protected

Expand the interval

参数

interval	Interval to be expanded
width	Distance to be added to the interval
direction	Direction of the expand operation

返回: Expanded interval

◆ expandScale()

QwtInterval QwtPlotRescaler::expandScale	(	QwtAxisId	axisId,
		const QSize &	oldSize,
		const QSize &	newSize
	)		const

protectedvirtual

Calculate the new scale interval of a plot axis

参数

axisId	Axis
oldSize	Previous size of the canvas
newSize	New size of the canvas

返回: Calculated new interval for the axis

◆ interval()

QwtInterval QwtPlotRescaler::interval ( QwtAxisId axisId ) const

protected

参数

axisId Axis

返回: Normalized interval of an axis

◆ intervalHint()

QwtInterval QwtPlotRescaler::intervalHint ( QwtAxisId axisId ) const

Gets the interval hint for an axis

参数

[in] axisId Axis identifier

返回: Interval hint

参见: setIntervalHint(), RescalePolicy

◆ isEnabled()

bool QwtPlotRescaler::isEnabled ( ) const

Checks if the rescaler is enabled

返回: true if enabled, false otherwise

参见: setEnabled(), eventFilter()

◆ orientation()

Qt::Orientation QwtPlotRescaler::orientation ( QwtAxisId axisId ) const

protected

返回: Orientation of an axis

参数

axisId Axis

◆ plot() [1/2]

QwtPlot * QwtPlotRescaler::plot ( )

Gets the plot widget

返回: Plot widget

◆ plot() [2/2]

const QwtPlot * QwtPlotRescaler::plot ( ) const

Gets the plot widget (const version)

返回: Plot widget (const)

◆ referenceAxis()

QwtAxisId QwtPlotRescaler::referenceAxis ( ) const

Gets the reference axis

返回: Reference axis identifier

参见: setReferenceAxis()

◆ rescale() [1/2]

void QwtPlotRescaler::rescale ( ) const

Rescales the plot axes

Adjusts the plot axes scales based on the current canvas size.

◆ rescale() [2/2]

void QwtPlotRescaler::rescale	(	const QSize &	oldSize,
		const QSize &	newSize
	)		const

protectedvirtual

Adjust the plot axes scales

参数

oldSize	Previous size of the canvas
newSize	New size of the canvas

◆ rescalePolicy()

QwtPlotRescaler::RescalePolicy QwtPlotRescaler::rescalePolicy ( ) const

Gets the rescale policy

返回: Rescale policy

参见: setRescalePolicy()

◆ setAspectRatio() [1/2]

void QwtPlotRescaler::setAspectRatio ( double ratio )

Sets the aspect ratio for all axes

Sets the aspect ratio between the scale of the reference axis and other scales. The default ratio is 1.0.

参数

[in] ratio Aspect ratio

参见: aspectRatio()

◆ setAspectRatio() [2/2]

void QwtPlotRescaler::setAspectRatio	(	QwtAxisId	axisId,
		double	ratio
	)

Sets the aspect ratio for a specific axis

Sets the aspect ratio between the scale of the reference axis and another scale. The default ratio is 1.0.

参数

[in]	axisId	Axis identifier
[in]	ratio	Aspect ratio

参见: aspectRatio()

◆ setEnabled()

void QwtPlotRescaler::setEnabled ( bool on )

Enables or disables the rescaler

When enabled is true, an event filter is installed for the canvas, otherwise the event filter is removed.

参数

[in] on true to enable, false to disable

参见: isEnabled(), eventFilter()

◆ setExpandingDirection() [1/2]

void QwtPlotRescaler::setExpandingDirection ( ExpandingDirection direction )

Sets the expanding direction for all axes

参数

[in] direction Expanding direction

参见: expandingDirection()

◆ setExpandingDirection() [2/2]

void QwtPlotRescaler::setExpandingDirection	(	QwtAxisId	axisId,
		ExpandingDirection	direction
	)

Sets the expanding direction for a specific axis

参数

[in]	axisId	Axis identifier
[in]	direction	Expanding direction

参见: expandingDirection()

◆ setIntervalHint()

void QwtPlotRescaler::setIntervalHint	(	QwtAxisId	axisId,
		const QwtInterval &	interval
	)

Sets an interval hint for an axis

In Fitting mode, the hint is used as the minimal interval that always needs to be displayed.

参数

[in]	axisId	Axis identifier
[in]	interval	Interval hint

参见: intervalHint(), RescalePolicy

◆ setReferenceAxis()

void QwtPlotRescaler::setReferenceAxis ( QwtAxisId axisId )

Sets the reference axis

The reference axis is used as the basis for rescale calculations.

参数

[in] axisId Axis identifier

参见: referenceAxis()

◆ setRescalePolicy()

void QwtPlotRescaler::setRescalePolicy ( RescalePolicy policy )

Sets the rescale policy

参数

[in] policy Rescale policy

参见: rescalePolicy()

◆ syncScale()

QwtInterval QwtPlotRescaler::syncScale	(	QwtAxisId	axisId,
		const QwtInterval &	reference,
		const QSize &	size
	)		const

protectedvirtual

Synchronize an axis scale according to the scale of the reference axis

参数

axisId	Axis
reference	Interval of the reference axis
size	Size of the canvas

返回: New interval for axis

◆ updateScales()

void QwtPlotRescaler::updateScales ( QwtInterval intervals[QwtAxis::AxisPositions] ) const

protectedvirtual

Update the axes scales

参数

intervals Scale intervals

该类的文档由以下文件生成:

/home/runner/work/QWT/QWT/src/plot/qwt_plot_rescaler.h
/home/runner/work/QWT/QWT/src/plot/qwt_plot_rescaler.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

◆ ExpandingDirection

◆ RescalePolicy

构造及析构函数说明

◆ QwtPlotRescaler()

成员函数说明

◆ aspectRatio()

◆ canvas() [1/2]

◆ canvas() [2/2]

◆ canvasResizeEvent()

◆ eventFilter()

◆ expandingDirection()

◆ expandInterval()

◆ expandScale()

◆ interval()

◆ intervalHint()

◆ isEnabled()

◆ orientation()

◆ plot() [1/2]

◆ plot() [2/2]

◆ referenceAxis()

◆ rescale() [1/2]

◆ rescale() [2/2]

◆ rescalePolicy()

◆ setAspectRatio() [1/2]

◆ setAspectRatio() [2/2]

◆ setEnabled()

◆ setExpandingDirection() [1/2]

◆ setExpandingDirection() [2/2]

◆ setIntervalHint()

◆ setReferenceAxis()

◆ setRescalePolicy()

◆ syncScale()

◆ updateScales()