QwtLogTransform - Logarithmic transformation.

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Version 6.1.4                                    Wed Jan 2 2019                               QwtLogTransform(3)

       Logarithmic transformation.

       QwtLogTransform modifies the values using log() and exp().

       Note:
           In the calculations of QwtScaleMap the base of the log function has no effect on the mapping. So
           QwtLogTransform can be used for log2(), log10() or any other logarithmic scale.

doubleQwtLogTransform::bounded(doublevalue)const[virtual]Parameters:value Value to be bounded

       Returns:
           qBound( LogMin, value, LogMax )

       Reimplemented from QwtTransform.

   QwtTransform*QwtLogTransform::copy()const[virtual]Returns:
           Clone of the transformation

       Implements QwtTransform.

   doubleQwtLogTransform::invTransform(doublevalue)const[virtual]Parameters:value Value to be transformed

       Returns:
           exp( value )

       Implements QwtTransform.

   doubleQwtLogTransform::transform(doublevalue)const[virtual]Parameters:value Value to be transformed

       Returns:
           log( value )

       Implements QwtTransform.

       QwtLogTransform - Logarithmic transformation.

       #include <qwt_transform.h>

       Inherits QwtTransform.

   PublicMemberFunctionsQwtLogTransform ()
           Constructor.
       virtual ~QwtLogTransform ()
           Destructor.
       virtual double transform (double value) const
       virtual double invTransform (double value) const
       virtual double bounded (double value) const
       virtual QwtTransform * copy () const

   PublicAttributes
       QT_STATIC_CONST double LogMin = 1.0e-150
           Smallest allowed value for logarithmic scales: 1.0e-150.
       QT_STATIC_CONST double LogMax = 1.0e150
           Largest allowed value for logarithmic scales: 1.0e150.