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

#include <qwt_abstract_scale.h>

Inheritance diagram for QwtAbstractScale:

[legend]

Classes
class	PrivateData

Public Member Functions
double	invTransform (int) const

bool	isInverted () const

double	lowerBound () const

double	maximum () const

double	minimum () const

	QwtAbstractScale (QWidget *parent=NULL)

const QwtScaleDiv &	scaleDiv () const

const QwtScaleEngine *	scaleEngine () const

QwtScaleEngine *	scaleEngine ()

const QwtScaleMap &	scaleMap () const

int	scaleMaxMajor () const

int	scaleMaxMinor () const

double	scaleStepSize () const

void	setLowerBound (double value)

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...

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

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

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

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

void	setUpperBound (double value)

int	transform (double) const

double	upperBound () const

virtual	~QwtAbstractScale ()
	Destructor. More...

Protected Member Functions
const QwtAbstractScaleDraw *	abstractScaleDraw () const

QwtAbstractScaleDraw *	abstractScaleDraw ()

virtual void	changeEvent (QEvent *)

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

virtual void	scaleChange ()
	Notify changed scale. More...

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

void	updateScaleDraw ()

Properties
double	lowerBound

int	scaleMaxMajor

int	scaleMaxMinor

double	scaleStepSize

double	upperBound

Private Attributes
PrivateData *	d_data

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 ... ).

Definition at line 36 of file qwt_abstract_scale.h.

Constructor & Destructor Documentation

QwtAbstractScale::QwtAbstractScale ( QWidget * parent = NULL )

explicit

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.

Definition at line 56 of file qwt_abstract_scale.cpp.

QwtAbstractScale::~QwtAbstractScale ( )

virtual

Destructor.

Definition at line 64 of file qwt_abstract_scale.cpp.

Member Function Documentation

const QwtAbstractScaleDraw * QwtAbstractScale::abstractScaleDraw ( ) const

protected

Returns: Scale draw

See also: setAbstractScaleDraw()

Definition at line 301 of file qwt_abstract_scale.cpp.

QwtAbstractScaleDraw * QwtAbstractScale::abstractScaleDraw ( )

protected

Returns: Scale draw

See also: setAbstractScaleDraw()

Definition at line 292 of file qwt_abstract_scale.cpp.

void QwtAbstractScale::changeEvent ( QEvent * event )

protectedvirtual

Change Event handler

Parameters

event Change event

Invalidates internal caches if necessary

Reimplemented in QwtThermo, QwtKnob, QwtDial, and QwtSlider.

Definition at line 452 of file qwt_abstract_scale.cpp.

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()

Definition at line 380 of file qwt_abstract_scale.cpp.

bool QwtAbstractScale::isInverted ( ) const

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

Definition at line 389 of file qwt_abstract_scale.cpp.

double QwtAbstractScale::lowerBound ( ) const

double QwtAbstractScale::maximum ( ) const

Returns: The boundary with the larger value

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

Definition at line 408 of file qwt_abstract_scale.cpp.

double QwtAbstractScale::minimum ( ) const

Returns: The boundary with the smaller value

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

Definition at line 398 of file qwt_abstract_scale.cpp.

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()

Definition at line 428 of file qwt_abstract_scale.cpp.

void QwtAbstractScale::scaleChange ( )

protectedvirtual

Notify changed scale.

Reimplemented in QwtThermo, QwtDial, QwtAbstractSlider, and QwtSlider.

Definition at line 415 of file qwt_abstract_scale.cpp.

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().

Definition at line 348 of file qwt_abstract_scale.cpp.

const QwtScaleEngine * QwtAbstractScale::scaleEngine ( ) const

Returns: Scale engine

See also: setScaleEngine()

Definition at line 328 of file qwt_abstract_scale.cpp.

QwtScaleEngine * QwtAbstractScale::scaleEngine ( )

Returns: Scale engine

See also: setScaleEngine()

Definition at line 337 of file qwt_abstract_scale.cpp.

const QwtScaleMap & QwtAbstractScale::scaleMap ( ) const

Returns: Map to translate between scale and widget coordinates

Definition at line 356 of file qwt_abstract_scale.cpp.

int QwtAbstractScale::scaleMaxMajor ( ) const

int QwtAbstractScale::scaleMaxMinor ( ) const

double QwtAbstractScale::scaleStepSize ( ) const

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()

Definition at line 276 of file qwt_abstract_scale.cpp.

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

Definition at line 78 of file qwt_abstract_scale.cpp.

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

Definition at line 129 of file qwt_abstract_scale.cpp.

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

Definition at line 144 of file qwt_abstract_scale.cpp.

void QwtAbstractScale::setScale ( const QwtScaleDiv & scaleDiv )

Specify a scale.

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

Parameters

scaleDiv Scale division

See also: setAutoScale()

Definition at line 157 of file qwt_abstract_scale.cpp.

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.

Definition at line 315 of file qwt_abstract_scale.cpp.

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()

Definition at line 188 of file qwt_abstract_scale.cpp.

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()

Definition at line 218 of file qwt_abstract_scale.cpp.

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().

Definition at line 250 of file qwt_abstract_scale.cpp.

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

Definition at line 101 of file qwt_abstract_scale.cpp.

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()

Definition at line 368 of file qwt_abstract_scale.cpp.

void QwtAbstractScale::updateScaleDraw ( )

protected

Recalculate ticks and scale boundaries.

Definition at line 465 of file qwt_abstract_scale.cpp.

double QwtAbstractScale::upperBound ( ) const

Member Data Documentation

PrivateData* QwtAbstractScale::d_data

private

Definition at line 102 of file qwt_abstract_scale.h.

Property Documentation

double QwtAbstractScale::lowerBound

readwrite

Returns: Lower bound of the scale

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

Definition at line 40 of file qwt_abstract_scale.h.

int QwtAbstractScale::scaleMaxMajor

readwrite

Returns: Maximal number of major tick intervals

See also: setScaleMaxMajor(), scaleMaxMinor()

Definition at line 43 of file qwt_abstract_scale.h.

int QwtAbstractScale::scaleMaxMinor

readwrite

Returns: Maximal number of minor tick intervals

See also: setScaleMaxMinor(), scaleMaxMajor()

Definition at line 44 of file qwt_abstract_scale.h.

double QwtAbstractScale::scaleStepSize

readwrite

Returns: Hint for the step size of the scale

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

Definition at line 46 of file qwt_abstract_scale.h.

double QwtAbstractScale::upperBound

readwrite

Returns: Upper bound of the scale

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

Definition at line 41 of file qwt_abstract_scale.h.

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

Classes

Public Member Functions

Protected Member Functions

Properties

Private Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation

Property Documentation