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

#include <qwt_plot_rescaler.h>

Inheritance diagram for QwtPlotRescaler:

Classes
class	AxisData

class	PrivateData

Public Types
enum	RescalePolicy { Fixed , Expanding , Fitting }
	The rescale policy defines how to rescale the reference axis and their depending axes. More...

enum	ExpandingDirection { ExpandUp , ExpandDown , ExpandBoth }
	When rescalePolicy() is set to Expanding its direction depends on ExpandingDirection. More...

Public Member Functions
	QwtPlotRescaler (QWidget *canvas, QwtAxisId referenceAxis=QwtAxis::XBottom, RescalePolicy=Expanding)
	Constructor.

virtual	~QwtPlotRescaler ()
	Destructor.

void	setEnabled (bool)
	En/disable the rescaler.

bool	isEnabled () const

void	setRescalePolicy (RescalePolicy)
	Change the rescale policy.

RescalePolicy	rescalePolicy () const

void	setExpandingDirection (ExpandingDirection)
	Set the direction in which all axis should be expanded.

void	setExpandingDirection (QwtAxisId, ExpandingDirection)
	Set the direction in which an axis should be expanded.

ExpandingDirection	expandingDirection (QwtAxisId) const

void	setReferenceAxis (QwtAxisId)
	Set the reference axis ( see RescalePolicy )

QwtAxisId	referenceAxis () const

void	setAspectRatio (double ratio)
	Set the aspect ratio between the scale of the reference axis and the other scales.

void	setAspectRatio (QwtAxisId, double ratio)
	Set the aspect ratio between the scale of the reference axis and another scale.

double	aspectRatio (QwtAxisId) const

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

QwtInterval	intervalHint (QwtAxisId) const

QWidget *	canvas ()

const QWidget *	canvas () const

QwtPlot *	plot ()

const QwtPlot *	plot () const

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

void	rescale () const
	Adjust the plot axes scales.

Protected Member Functions
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.

Detailed Description

QwtPlotRescaler takes care of fixed aspect ratios for plot scales.

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

Member Enumeration Documentation

◆ ExpandingDirection

enum QwtPlotRescaler::ExpandingDirection

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

Enumerator
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

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

See also: ExpandingDirection, setIntervalHint()

Enumerator

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.

Constructor & Destructor Documentation

◆ QwtPlotRescaler()

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

explicit

Constructor.

Parameters

canvas	Canvas
referenceAxis	Reference axis, see RescalePolicy
policy	Rescale policy

See also: setRescalePolicy(), setReferenceAxis()

Member Function Documentation

◆ aspectRatio()

double QwtPlotRescaler::aspectRatio ( QwtAxisId axisId ) const

Returns: Aspect ratio between an axis and the reference axis.

Parameters

axisId Axis

See also: setAspectRatio()

◆ canvas() [1/2]

QWidget * QwtPlotRescaler::canvas ( )

Returns: plot canvas

◆ canvas() [2/2]

const QWidget * QwtPlotRescaler::canvas ( ) const

Returns: plot canvas

◆ canvasResizeEvent()

void QwtPlotRescaler::canvasResizeEvent ( QResizeEvent * event )

protectedvirtual

Event handler for resize events of the plot canvas.

Parameters

event Resize event

See also: rescale()

◆ expandingDirection()

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

Returns: Direction in which an axis should be expanded

Parameters

axisId Axis

See also: setExpandingDirection()

◆ expandInterval()

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

protected

Expand the interval.

Parameters

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

Returns: 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.

Parameters

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

Returns: Calculated new interval for the axis

◆ interval()

QwtInterval QwtPlotRescaler::interval ( QwtAxisId axisId ) const

protected

Parameters

axisId Axis

Returns: Normalized interval of an axis

◆ intervalHint()

QwtInterval QwtPlotRescaler::intervalHint ( QwtAxisId axisId ) const

Parameters

axisId Axis

Returns: Interval hint

See also: setIntervalHint(), RescalePolicy

◆ isEnabled()

bool QwtPlotRescaler::isEnabled ( ) const

Returns: true when enabled, false otherwise

See also: setEnabled, eventFilter()

◆ orientation()

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

protected

Returns: Orientation of an axis

Parameters

axisId Axis

◆ plot() [1/2]

QwtPlot * QwtPlotRescaler::plot ( )

Returns: plot widget

◆ plot() [2/2]

const QwtPlot * QwtPlotRescaler::plot ( ) const

Returns: plot widget

◆ referenceAxis()

QwtAxisId QwtPlotRescaler::referenceAxis ( ) const

Returns: Reference axis ( see RescalePolicy )

See also: setReferenceAxis()

◆ rescale()

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

protectedvirtual

Adjust the plot axes scales.

Parameters

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

◆ rescalePolicy()

QwtPlotRescaler::RescalePolicy QwtPlotRescaler::rescalePolicy ( ) const

Returns: Rescale policy

See also: setRescalePolicy()

◆ setAspectRatio() [1/2]

void QwtPlotRescaler::setAspectRatio ( double ratio )

Set the aspect ratio between the scale of the reference axis and the other scales.

The default ratio is 1.0

Parameters

ratio Aspect ratio

See also: aspectRatio()

◆ setAspectRatio() [2/2]

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

Set the aspect ratio between the scale of the reference axis and another scale.

The default ratio is 1.0

Parameters

axisId	Axis
ratio	Aspect ratio

See also: aspectRatio()

◆ setEnabled()

void QwtPlotRescaler::setEnabled ( bool on )

En/disable the rescaler.

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

Parameters

on	true or false

See also: isEnabled(), eventFilter()

◆ setExpandingDirection() [1/2]

void QwtPlotRescaler::setExpandingDirection ( ExpandingDirection direction )

Set the direction in which all axis should be expanded.

Parameters

direction Direction

See also: expandingDirection()

◆ setExpandingDirection() [2/2]

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

Set the direction in which an axis should be expanded.

Parameters

axisId	Axis
direction	Direction

See also: expandingDirection()

◆ setIntervalHint()

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

Set an interval hint for an axis.

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

Parameters

axisId	Axis
interval	Axis

See also: intervalHint(), RescalePolicy

◆ setReferenceAxis()

void QwtPlotRescaler::setReferenceAxis ( QwtAxisId axisId )

Set the reference axis ( see RescalePolicy )

Parameters

axisId Axis

See also: referenceAxis()

◆ setRescalePolicy()

void QwtPlotRescaler::setRescalePolicy ( RescalePolicy policy )

Change the rescale policy.

Parameters

policy Rescale policy

See also: 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.

Parameters

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

Returns: New interval for axis

◆ updateScales()

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

protectedvirtual

Update the axes scales.

Parameters

intervals Scale intervals

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

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

Classes

Public Types

Public Member Functions

Protected Member Functions

Detailed Description

Member Enumeration Documentation

◆ ExpandingDirection

◆ RescalePolicy

Constructor & Destructor Documentation

◆ QwtPlotRescaler()

Member Function Documentation

◆ aspectRatio()

◆ canvas() [1/2]

◆ canvas() [2/2]

◆ canvasResizeEvent()

◆ expandingDirection()

◆ expandInterval()

◆ expandScale()

◆ interval()

◆ intervalHint()

◆ isEnabled()

◆ orientation()

◆ plot() [1/2]

◆ plot() [2/2]

◆ referenceAxis()

◆ rescale()

◆ rescalePolicy()

◆ setAspectRatio() [1/2]

◆ setAspectRatio() [2/2]

◆ setEnabled()

◆ setExpandingDirection() [1/2]

◆ setExpandingDirection() [2/2]

◆ setIntervalHint()

◆ setReferenceAxis()

◆ setRescalePolicy()

◆ syncScale()

◆ updateScales()