trusty (3) QwtAbstractScale.3.gz

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 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 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

   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 QwtInterval &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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