QwtAbstractScale Class Reference

#include <qwt_abstract_scale.h>

Inherited by QwtKnob, QwtSlider, and QwtThermo.

List of all members.

Public Member Functions
bool	autoScale () const
	QwtAbstractScale ()
const QwtScaleEngine *	scaleEngine () const
QwtScaleEngine *	scaleEngine ()
const QwtScaleMap &	scaleMap () const
int	scaleMaxMajor () const
int	scaleMaxMinor () const
void	setAutoScale ()
void	setScale (double vmin, double vmax, double step=0.0)
void	setScale (const QwtInterval &, double step=0.0)
void	setScale (const QwtScaleDiv &)
void	setScaleEngine (QwtScaleEngine *)
void	setScaleMaxMajor (int ticks)
void	setScaleMaxMinor (int ticks)
virtual	~QwtAbstractScale ()
Protected Member Functions
const QwtAbstractScaleDraw *	abstractScaleDraw () const
QwtAbstractScaleDraw *	abstractScaleDraw ()
void	rescale (double vmin, double vmax, double step=0.0)
virtual void	scaleChange ()
void	setAbstractScaleDraw (QwtAbstractScaleDraw *)

---

Detailed Description

An abstract base class for classes containing a scale.

QwtAbstractScale is used to provide classes with a QwtScaleDraw, and a QwtScaleDiv. The QwtScaleDiv might be set explicitely or calculated by a QwtScaleEngine.

---

Constructor & Destructor Documentation

QwtAbstractScale::QwtAbstractScale

(

)

Constructor

Creates a default QwtScaleDraw and a QwtLinearScaleEngine. Autoscaling is enabled, and the stepSize is initialized by 0.0.

QwtAbstractScale::~QwtAbstractScale

(

)

[virtual]

Destructor.

---

Member Function Documentation

const QwtAbstractScaleDraw * QwtAbstractScale::abstractScaleDraw

(

)

const [protected]

Returns:

Scale draw

See also:

setAbstractScaleDraw()

QwtAbstractScaleDraw * QwtAbstractScale::abstractScaleDraw

(

)

[protected]

Returns:

Scale draw

See also:

setAbstractScaleDraw()

bool QwtAbstractScale::autoScale

(

)

const

Returns:

true if autoscaling is enabled

void QwtAbstractScale::rescale	(	double	vmin,
		double	vmax,
		double	stepSize = 0.0
	)		[protected]

Recalculate the scale division and update the scale draw.

Parameters:

vmin	Lower limit of the scale interval
vmax	Upper limit of the scale interval
stepSize	Major step size

See also:

scaleChange()

void QwtAbstractScale::scaleChange

(

)

[protected, virtual]

Notify changed scale.

Dummy empty implementation, intended to be overloaded by derived classes

Reimplemented in QwtThermo, and QwtSlider.

const QwtScaleEngine * QwtAbstractScale::scaleEngine

(

)

const

Returns:

Scale engine

See also:

setScaleEngine()

QwtScaleEngine * QwtAbstractScale::scaleEngine

(

)

Returns:

Scale engine

See also:

setScaleEngine()

const QwtScaleMap & QwtAbstractScale::scaleMap

(

)

const

Returns:

abstractScaleDraw()->scaleMap()

int QwtAbstractScale::scaleMaxMajor

(

)

const

Returns:

Max. number of major tick intervals The default value is 5.

int QwtAbstractScale::scaleMaxMinor

(

)

const

Returns:

Max. number of minor tick intervals The default value is 3.

void QwtAbstractScale::setAbstractScaleDraw

(

QwtAbstractScaleDraw *

scaleDraw

)

[protected]

Set a scale draw.

scaleDraw has to be created with new and will be deleted in ~QwtAbstractScale or the next call of setAbstractScaleDraw.

void QwtAbstractScale::setAutoScale

(

)

Advise the widget to control the scale range internally.

Autoscaling is on by default.

See also:

setScale(), autoScale()

void QwtAbstractScale::setScale	(	double	vmin,
		double	vmax,
		double	stepSize = 0.0
	)

Specify a scale.

Disable autoscaling and define a scale by an interval and a step size

Parameters:

vmin	lower limit of the scale interval
vmax	upper limit of the scale interval
stepSize	major step size

    d_data->autoScale = false;
    d_data->stepSize = stepSize;

    rescale( vmin, vmax, stepSize );
    QwtAbstractScale *xx = new QwtAbstractScale(12, "hello", this);

See also:

setAutoScale()

void QwtAbstractScale::setScale	(	const QwtInterval &	interval,
		double	stepSize = 0.0
	)

Specify a scale.

Disable autoscaling and define a scale by an interval and a step size

Parameters:

interval	Interval
stepSize	major step size

See also:

setAutoScale()

void QwtAbstractScale::setScale

(

const QwtScaleDiv &

scaleDiv

)

Specify a scale.

Disable autoscaling and define a scale by a scale division

Parameters:

scaleDiv

Scale division

See also:

setAutoScale()

void QwtAbstractScale::setScaleEngine

(

QwtScaleEngine *

scaleEngine

)

Set a scale engine.

The scale engine is responsible for calculating the scale division, and in case of auto scaling how to align the scale.

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

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:

QwtAbstractScaleDraw

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

See also:

QwtAbstractScaleDraw