QwtAbstractScale(3) An abstract base class for classes containing a scale.

SYNOPSIS


#include <qwt_abstract_scale.h>

Inherited by QwtKnob, QwtSlider, and QwtThermo.

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 (const QwtDoubleInterval &, double step=0.0)

void setScale (const QwtScaleDiv &s)

void setScale (double vmin, double vmax, double step=0.0)

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 explicitly 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 () constReturns:

true if autoscaling is enabled

void QwtAbstractScale::rescale (doublevmin, doublevmax, doublestepSize = 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 QwtSlider, and QwtThermo.

const QwtScaleEngine * QwtAbstractScale::scaleEngine () constReturns:

Scale engine

See also:

setScaleEngine()

QwtScaleEngine * QwtAbstractScale::scaleEngine ()Returns:

Scale engine

See also:

setScaleEngine()

const QwtScaleMap & QwtAbstractScale::scaleMap () constReturns:

abstractScaleDraw()->scaleMap()

int QwtAbstractScale::scaleMaxMajor () constReturns:

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

int QwtAbstractScale::scaleMaxMinor () constReturns:

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 (doublevmin, doublevmax, doublestepSize = 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

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::setScale (const QwtDoubleInterval &interval, doublestepSize = 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::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 (intticks)

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 (intticks)

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

Author

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