QwtAbstractScale - Man Page
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
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 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
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 () const Returns
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 () const Returns
Scale engine
See also:
setScaleEngine()
QwtScaleEngine * QwtAbstractScale::scaleEngine () 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 (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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