QwtAbstractScale(3)

NAME
QwtAbstractScale -

SYNOPSIS

Inherited by QwtKnob, QwtSlider, and QwtThermo.

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.

Definition at line 29 of file qwt_abstract_scale.h.

  Public Member Functions
QwtAbstractScale ()
virtual ~QwtAbstractScale ()
void setScale (double vmin, double vmax, double step=0.0)
void setScale (const QwtDoubleInterval &, double step=0.0)
void setScale (const QwtScaleDiv &s)
void setAutoScale ()
bool autoScale () const
void setScaleMaxMajor (int ticks)
int scaleMaxMinor () const
void setScaleMaxMinor (int ticks)
int scaleMaxMajor () const
void setScaleEngine (QwtScaleEngine *)
const QwtScaleEngine * scaleEngine () const
QwtScaleEngine * scaleEngine ()
const QwtScaleMap & scaleMap () const

  Protected Member Functions
void rescale (double vmin, double vmax, double step=0.0)
void setAbstractScaleDraw (QwtAbstractScaleDraw *)
const QwtAbstractScaleDraw * abstractScaleDraw () const
QwtAbstractScaleDraw * abstractScaleDraw ()
virtual void scaleChange ()

Constructor & Destructor Documentation

  QwtAbstractScale::QwtAbstractScale ()

Constructor

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

Definition at line 53 of file qwt_abstract_scale.cpp.

References rescale().

  QwtAbstractScale::~QwtAbstractScale () [virtual]

Destructor.

Definition at line 60 of file qwt_abstract_scale.cpp.

Member Function Documentation

  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

See also:
    setAutoScale()

Definition at line 75 of file qwt_abstract_scale.cpp.

References rescale().

Referenced by setScale().

  void QwtAbstractScale::setScale (const QwtDoubleInterval & 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()

Definition at line 92 of file qwt_abstract_scale.cpp.

References QwtDoubleInterval::maxValue(), QwtDoubleInterval::minValue(), and setScale().

  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()

Definition at line 107 of file qwt_abstract_scale.cpp.

References scaleChange().

  void QwtAbstractScale::setAutoScale ()

Advise the widget to control the scale range internally.

Autoscaling is on by default.

See also:
    setScale(), autoScale()

Definition at line 147 of file qwt_abstract_scale.cpp.

References scaleChange().

  bool QwtAbstractScale::autoScale () const

Returns:
    true if autoscaling is enabled

Definition at line 159 of file qwt_abstract_scale.cpp.

Referenced by QwtSlider::rangeChange(), and QwtThermo::setRange().

  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

Definition at line 173 of file qwt_abstract_scale.cpp.

  int QwtAbstractScale::scaleMaxMinor () const

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

Definition at line 204 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

See also:
    QwtAbstractScaleDraw

Definition at line 191 of file qwt_abstract_scale.cpp.

  int QwtAbstractScale::scaleMaxMajor () const

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

Definition at line 213 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 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.

Definition at line 269 of file qwt_abstract_scale.cpp.

References scaleEngine().

Referenced by QwtThermo::setRange().

  const QwtScaleEngine * QwtAbstractScale::scaleEngine () const

Returns:
    Scale engine

See also:
    setScaleEngine()

Definition at line 282 of file qwt_abstract_scale.cpp.

Referenced by QwtThermo::setRange(), and setScaleEngine().

  QwtScaleEngine * QwtAbstractScale::scaleEngine ()

Returns:
    Scale engine

See also:
    setScaleEngine()

Definition at line 291 of file qwt_abstract_scale.cpp.

  const QwtScaleMap & QwtAbstractScale::scaleMap () const

Returns:
    abstractScaleDraw()->scaleMap()

Definition at line 308 of file qwt_abstract_scale.cpp.

  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()

Definition at line 127 of file qwt_abstract_scale.cpp.

References scaleChange().

Referenced by QwtAbstractScale(), QwtSlider::rangeChange(), QwtThermo::setRange(), and setScale().

  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.

Definition at line 224 of file qwt_abstract_scale.cpp.

References QwtAbstractScaleDraw::setScaleDiv().

Referenced by QwtThermo::setScaleDraw(), QwtSlider::setScaleDraw(), and QwtKnob::setScaleDraw().

  const QwtAbstractScaleDraw * QwtAbstractScale::abstractScaleDraw () const [protected]

Returns:
    Scale draw

See also:
    setAbstractScaleDraw()

Definition at line 249 of file qwt_abstract_scale.cpp.

Referenced by QwtThermo::scaleDraw(), QwtSlider::scaleDraw(), and QwtKnob::scaleDraw().

  QwtAbstractScaleDraw * QwtAbstractScale::abstractScaleDraw () [protected]

Returns:
    Scale draw

See also:
    setAbstractScaleDraw()

Definition at line 240 of file qwt_abstract_scale.cpp.

  void QwtAbstractScale::scaleChange () [protected, virtual]

Notify changed scale.

Dummy empty implementation, intended to be overloaded by derived classes

Reimplemented in QwtSlider, and QwtThermo.

Definition at line 301 of file qwt_abstract_scale.cpp.

Referenced by rescale(), setAutoScale(), and setScale().

Author

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