An abstract base class for widgets having a scale. More...

#include <qwt_abstract_scale.h>

Inheritance diagram for QwtAbstractScale:

[legend]

Public Member Functions
	QwtAbstractScale (QWidget *parent=NULL)

virtual	~QwtAbstractScale ()
	Destructor.

void	setScale (double lowerBound, double upperBound)
	Specify a scale. More...

void	setScale (const QwtInterval &)
	Specify a scale. More...

void	setScale (const QwtScaleDiv &)
	Specify a scale. More...

const QwtScaleDiv &	scaleDiv () const

void	setLowerBound (double value)

double	lowerBound () const

void	setUpperBound (double value)

double	upperBound () const

void	setScaleStepSize (double stepSize)
	Set the step size used for calculating a scale division. More...

double	scaleStepSize () const

void	setScaleMaxMajor (int ticks)
	Set the maximum number of major tick intervals. More...

int	scaleMaxMinor () const

void	setScaleMaxMinor (int ticks)
	Set the maximum number of minor tick intervals. More...

int	scaleMaxMajor () const

void	setScaleEngine (QwtScaleEngine *)
	Set a scale engine. More...

const QwtScaleEngine *	scaleEngine () const

QwtScaleEngine *	scaleEngine ()

int	transform (double) const

double	invTransform (int) const

bool	isInverted () const

double	minimum () const

double	maximum () const

const QwtScaleMap &	scaleMap () const

Protected Member Functions
void	rescale (double lowerBound, double upperBound, double stepSize)

void	setAbstractScaleDraw (QwtAbstractScaleDraw *)
	Set a scale draw. More...

const QwtAbstractScaleDraw *	abstractScaleDraw () const

QwtAbstractScaleDraw *	abstractScaleDraw ()

virtual void	scaleChange ()
	Notify changed scale.

Detailed Description

An abstract base class for widgets having a scale.

The scale of an QwtAbstractScale is determined by a QwtScaleDiv definition, that contains the boundaries and the ticks of the scale. The scale is painted using a QwtScaleDraw object.

The scale division might be assigned explicitly - but usually it is calculated from the boundaries using a QwtScaleEngine.

The scale engine also decides the type of transformation of the scale ( linear, logarithmic ... ).

Constructor & Destructor Documentation

◆ QwtAbstractScale()

QwtAbstractScale::QwtAbstractScale ( QWidget * parent = NULL )

Constructor

Parameters

parent Parent widget

Creates a default QwtScaleDraw and a QwtLinearScaleEngine. The initial scale boundaries are set to [ 0.0, 100.0 ]

The scaleStepSize() is initialized to 0.0, scaleMaxMajor() to 5 and scaleMaxMajor to 3.

Member Function Documentation

◆ abstractScaleDraw() [1/2]

QwtAbstractScaleDraw * QwtAbstractScale::abstractScaleDraw ( )

protected

Returns: Scale draw

See also: setAbstractScaleDraw()

◆ abstractScaleDraw() [2/2]

const QwtAbstractScaleDraw * QwtAbstractScale::abstractScaleDraw ( ) const

protected

Returns: Scale draw

See also: setAbstractScaleDraw()

◆ invTransform()

double QwtAbstractScale::invTransform ( int value ) const

Translate a widget coordinate into a scale value

Parameters

value Widget coordinate

Returns: Corresponding scale coordinate for value

See also: scaleMap(), transform()

◆ isInverted()

bool QwtAbstractScale::isInverted ( ) const

Returns: True, when the scale is increasing in opposite direction to the widget coordinates

◆ lowerBound()

double QwtAbstractScale::lowerBound ( ) const

Returns: Lower bound of the scale

See also: setLowerBound(), setScale(), upperBound()

◆ maximum()

double QwtAbstractScale::maximum ( ) const

Returns: The boundary with the larger value

See also: minimum(), lowerBound(), upperBound()

◆ minimum()

double QwtAbstractScale::minimum ( ) const

Returns: The boundary with the smaller value

See also: maximum(), lowerBound(), upperBound()

◆ rescale()

void QwtAbstractScale::rescale	(	double	lowerBound,
		double	upperBound,
		double	stepSize
	)

protected

Recalculate the scale division and update the scale.

Parameters

lowerBound	Lower limit of the scale interval
upperBound	Upper limit of the scale interval
stepSize	Major step size

See also: scaleChange()

◆ scaleDiv()

const QwtScaleDiv & QwtAbstractScale::scaleDiv ( ) const

Returns: Scale boundaries and positions of the ticks

The scale division might have been assigned explicitly or calculated implicitly by rescale().

◆ scaleEngine() [1/2]

QwtScaleEngine * QwtAbstractScale::scaleEngine ( )

Returns: Scale engine

See also: setScaleEngine()

◆ scaleEngine() [2/2]

const QwtScaleEngine * QwtAbstractScale::scaleEngine ( ) const

Returns: Scale engine

See also: setScaleEngine()

◆ scaleMap()

const QwtScaleMap & QwtAbstractScale::scaleMap ( ) const

Returns: Map to translate between scale and widget coordinates

◆ scaleMaxMajor()

int QwtAbstractScale::scaleMaxMajor ( ) const

Returns: Maximal number of major tick intervals

See also: setScaleMaxMajor(), scaleMaxMinor()

◆ scaleMaxMinor()

int QwtAbstractScale::scaleMaxMinor ( ) const

Returns: Maximal number of minor tick intervals

See also: setScaleMaxMinor(), scaleMaxMajor()

◆ scaleStepSize()

double QwtAbstractScale::scaleStepSize ( ) const

Returns: Hint for the step size of the scale

See also: setScaleStepSize(), QwtScaleEngine::divideScale()

◆ setAbstractScaleDraw()

void QwtAbstractScale::setAbstractScaleDraw ( QwtAbstractScaleDraw * scaleDraw )

protected

Set a scale draw.

scaleDraw has to be created with new and will be deleted in the destructor or the next call of setAbstractScaleDraw().

See also: abstractScaleDraw()

◆ setLowerBound()

void QwtAbstractScale::setLowerBound ( double value )

Set the lower bound of the scale

Parameters

value Lower bound

See also: lowerBound(), setScale(), setUpperBound()

Note: For inverted scales the lower bound is greater than the upper bound

◆ setScale() [1/3]

void QwtAbstractScale::setScale ( const QwtInterval & interval )

Specify a scale.

Define a scale by an interval

The ticks are calculated using scaleMaxMinor(), scaleMaxMajor() and scaleStepSize().

Parameters

interval Interval

◆ setScale() [2/3]

void QwtAbstractScale::setScale ( const QwtScaleDiv & scaleDiv )

Specify a scale.

scaleMaxMinor(), scaleMaxMajor() and scaleStepSize() and have no effect.

Parameters

scaleDiv Scale division

See also: setAutoScale()

◆ setScale() [3/3]

void QwtAbstractScale::setScale	(	double	lowerBound,
		double	upperBound
	)

Specify a scale.

Define a scale by an interval

The ticks are calculated using scaleMaxMinor(), scaleMaxMajor() and scaleStepSize().

Parameters

lowerBound	lower limit of the scale interval
upperBound	upper limit of the scale interval

Note: For inverted scales the lower bound is greater than the upper bound

◆ setScaleEngine()

void QwtAbstractScale::setScaleEngine ( QwtScaleEngine * scaleEngine )

Set a scale engine.

The scale engine is responsible for calculating the scale division and provides a transformation between scale and widget coordinates.

scaleEngine has to be created with new and will be deleted in the destructor or the next call of setScaleEngine.

◆ setScaleMaxMajor()

void QwtAbstractScale::setScaleMaxMajor ( int ticks )

Set the maximum number of major tick intervals.

The scale's major ticks are calculated automatically such that the number of major intervals does not exceed ticks.

The default value is 5.

Parameters

ticks Maximal number of major ticks.

See also: scaleMaxMajor(), setScaleMaxMinor(), setScaleStepSize(), QwtScaleEngine::divideInterval()

◆ setScaleMaxMinor()

void QwtAbstractScale::setScaleMaxMinor ( int ticks )

Set the maximum number of minor tick intervals.

The scale's minor ticks are calculated automatically such that the number of minor intervals does not exceed ticks. The default value is 3.

Parameters

ticks Maximal number of minor ticks.

See also: scaleMaxMajor(), setScaleMaxMinor(), setScaleStepSize(), QwtScaleEngine::divideInterval()

◆ setScaleStepSize()

void QwtAbstractScale::setScaleStepSize ( double stepSize )

Set the step size used for calculating a scale division.

The step size is hint for calculating the intervals for the major ticks of the scale. A value of 0.0 is interpreted as no hint.

Parameters

stepSize Hint for the step size of the scale

See also: scaleStepSize(), QwtScaleEngine::divideScale()

Note: Position and distance between the major ticks also depends on scaleMaxMajor().

◆ setUpperBound()

void QwtAbstractScale::setUpperBound ( double value )

Set the upper bound of the scale

Parameters

value Upper bound

See also: upperBound(), setScale(), setLowerBound()

Note: For inverted scales the lower bound is greater than the upper bound

◆ transform()

int QwtAbstractScale::transform ( double value ) const

Translate a scale value into a widget coordinate

Parameters

value Scale value

Returns: Corresponding widget coordinate for value

See also: scaleMap(), invTransform()

◆ upperBound()

double QwtAbstractScale::upperBound ( ) const

Returns: Upper bound of the scale

See also: setUpperBound(), setScale(), lowerBound()

Public Member Functions

Protected Member Functions

Detailed Description

Constructor & Destructor Documentation

◆ QwtAbstractScale()

Member Function Documentation

◆ abstractScaleDraw() [1/2]

◆ abstractScaleDraw() [2/2]

◆ invTransform()

◆ isInverted()

◆ lowerBound()

◆ maximum()

◆ minimum()

◆ rescale()

◆ scaleDiv()

◆ scaleEngine() [1/2]

◆ scaleEngine() [2/2]

◆ scaleMap()

◆ scaleMaxMajor()

◆ scaleMaxMinor()

◆ scaleStepSize()

◆ setAbstractScaleDraw()

◆ setLowerBound()

◆ setScale() [1/3]

◆ setScale() [2/3]

◆ setScale() [3/3]

◆ setScaleEngine()

◆ setScaleMaxMajor()

◆ setScaleMaxMinor()

◆ setScaleStepSize()

◆ setUpperBound()

◆ transform()

◆ upperBound()