QwtLogTransform(3)             Qwt User's Guide             QwtLogTransform(3)

NAME
       QwtLogTransform - Logarithmic transformation.


SYNOPSIS
       #include <qwt_transform.h>

       Inherits QwtTransform.

   Public Member Functions
       QwtLogTransform ()
           Constructor.
       virtual ~QwtLogTransform ()
           Destructor.
       virtual double transform (double value) const override
       virtual double invTransform (double value) const override
       virtual double bounded (double value) const override
       virtual QwtTransform * copy () const override

   Static Public Attributes
       static const double LogMin = 1.0e-150
           Smallest allowed value for logarithmic scales: 1.0e-150.
       static const double LogMax = 1.0e150
           Largest allowed value for logarithmic scales: 1.0e150.

Detailed Description
       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.

       Definition at line 100 of file qwt_transform.h.

Member Function Documentation
   double QwtLogTransform::bounded (double value) const [override],  [virtual]
       Parameters
           value Value to be bounded

       Returns
           qBound( LogMin, value, LogMax )

       Reimplemented from QwtTransform.

       Definition at line 106 of file qwt_transform.cpp.

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

       Implements QwtTransform.

       Definition at line 112 of file qwt_transform.cpp.

   double QwtLogTransform::invTransform (double value) const [override],
       [virtual]
       Parameters
           value Value to be transformed

       Returns
           exp( value )

       Implements QwtTransform.

       Definition at line 97 of file qwt_transform.cpp.

   double QwtLogTransform::transform (double value) const [override],
       [virtual]
       Parameters
           value Value to be transformed

       Returns
           log( value )

       Implements QwtTransform.

       Definition at line 88 of file qwt_transform.cpp.


Author
       Generated automatically by Doxygen for Qwt User's Guide from the source
       code.

Version 6.2.0                   Sun Jul 18 2021             QwtLogTransform(3)