NAME

       QwtAbstractScale -

SYNOPSIS

       #include <qwt_abstract_scale.h>

       Inherited by QwtKnob, QwtSlider, and QwtThermo.

   Public Member Functions
       QwtAbstractScale ()
       virtual ~QwtAbstractScale ()
       bool autoScale () const
       const QwtScaleEngine * scaleEngine () const
       QwtScaleEngine * scaleEngine ()
       const QwtScaleMap & scaleMap () const
       int scaleMaxMajor () const
       int scaleMaxMinor () const
       void setAutoScale ()
       void setScale (double vmin, double vmax, double step=0.0)
       void setScale (const QwtDoubleInterval &, double step=0.0)
       void setScale (const QwtScaleDiv &s)
       void setScaleEngine (QwtScaleEngine *)
       void setScaleMaxMajor (int ticks)
       void setScaleMaxMinor (int ticks)

   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 explicitly 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.

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 QwtThermo, and QwtSlider.

   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 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::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::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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