NAME
QwtAbstractScale - An abstract base class for classes containing a
scale.
SYNOPSIS
#include <qwt_abstract_scale.h>
Inherited by QwtKnob, QwtSlider, and QwtThermo.
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 ()
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
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 (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, 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
Author
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