QwtAbstractScale Class Reference

An abstract base class for classes containing a scale. More...

#include <qwt_abstract_scale.h>

Inheritance diagram for QwtAbstractScale:
Inheritance graph
[legend]

List of all members.

Public Member Functions

 QwtAbstractScale ()
virtual ~QwtAbstractScale ()
void setScale (double vmin, double vmax, double step=0.0)
void setScale (const QwtInterval &, double step=0.0)
void setScale (const QwtScaleDiv &)
void setAutoScale ()
bool autoScale () const
void setScaleMaxMajor (int ticks)
int scaleMaxMinor () const
void setScaleMaxMinor (int ticks)
int scaleMaxMajor () const
void setScaleEngine (QwtScaleEngine *)
const QwtScaleEnginescaleEngine () const
QwtScaleEnginescaleEngine ()
const QwtScaleMapscaleMap () const

Protected Member Functions

void rescale (double vmin, double vmax, double step=0.0)
void setAbstractScaleDraw (QwtAbstractScaleDraw *)
const QwtAbstractScaleDrawabstractScaleDraw () const
QwtAbstractScaleDrawabstractScaleDraw ()
virtual void scaleChange ()

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

QwtAbstractScaleDraw * QwtAbstractScale::abstractScaleDraw (  )  [protected]
Returns:
Scale draw
See also:
setAbstractScaleDraw()
const QwtAbstractScaleDraw * QwtAbstractScale::abstractScaleDraw (  )  const [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 QwtSlider, and QwtThermo.

QwtScaleEngine * QwtAbstractScale::scaleEngine (  ) 
Returns:
Scale engine
See also:
setScaleEngine()
const QwtScaleEngine * QwtAbstractScale::scaleEngine (  )  const
Returns:
Scale engine
See also:
setScaleEngine()
const QwtScaleMap & QwtAbstractScale::scaleMap (  )  const
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 ( 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 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 ( 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()
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
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