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# QwtAbstractScale Class Reference

Inheritance diagram for QwtAbstractScale:

[legend]
List of all members.

## 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

QwtAbstractScaleDraw * QwtAbstractScale::abstractScaleDraw | ( |  | ) | `[protected]`

| Returns: Scale draw See also: setAbstractScaleDraw() Definition at line 237 of file qwt_abstract_scale.cpp.

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

| Returns: Scale draw See also: setAbstractScaleDraw() Definition at line 246 of file qwt_abstract_scale.cpp. Referenced by QwtThermo::scaleDraw(), QwtSlider::scaleDraw(), and QwtKnob::scaleDraw().

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::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::scaleChange | ( |  | ) | `[protected, virtual]`

| Notify changed scale. Dummy empty implementation, intended to be overloaded by derived classes Reimplemented in QwtSlider, and QwtThermo. Definition at line 298 of file qwt_abstract_scale.cpp. Referenced by rescale(), setAutoScale(), and setScale().

QwtScaleEngine * QwtAbstractScale::scaleEngine | ( |  | ) |

| Returns: Scale engine See also: setScaleEngine() Definition at line 288 of file qwt_abstract_scale.cpp.

const QwtScaleEngine * QwtAbstractScale::scaleEngine | ( |  | ) | const

| Returns: Scale engine See also: setScaleEngine() Definition at line 279 of file qwt_abstract_scale.cpp. Referenced by QwtThermo::setRange(), and setScaleEngine().

const QwtScaleMap & QwtAbstractScale::scaleMap | ( |  | ) | const

| Returns: abstractScaleDraw()->scaleMap() Definition at line 305 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.

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

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().

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::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 | ( | 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::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 266 of file qwt_abstract_scale.cpp. References scaleEngine(). Referenced by 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.

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.