trusty (3) QwtScaleTransformation.3.gz

NAME

       QwtScaleTransformation -

       Operations for linear or logarithmic (base 10) transformations.

SYNOPSIS

       #include <qwt_scale_map.h>

   Public Types
       enum Type { Linear, Log10, Other }

   Public Member Functions
       QwtScaleTransformation (Type type)
       virtual ~QwtScaleTransformation ()
       virtual double xForm (double x, double s1, double s2, double p1, double p2) const
       virtual double invXForm (double x, double s1, double s2, double p1, double p2) const
       Type type () const
       virtual QwtScaleTransformation * copy () const

Detailed Description

       Operations for linear or logarithmic (base 10) transformations.

Member Enumeration Documentation

   enum QwtScaleTransformation::Type
       Transformation type.

       Enumerator:

       Linear Transformation between 2 linear scales.

       Log10  Transformation between a linear and a logarithmic ( base 10 ) scale.

       Other  Any other type of transformation.

Constructor & Destructor Documentation

   QwtScaleTransformation::QwtScaleTransformation (Typetype)
       Constructor for a linear transformation.

   QwtScaleTransformation::~QwtScaleTransformation () [virtual]
       Destructor.

Member Function Documentation

   QwtScaleTransformation * QwtScaleTransformation::copy () const [virtual]
       Create a clone of the transformation.

   double QwtScaleTransformation::invXForm (doublep, doublep1, doublep2, doubles1, doubles2) const [virtual]
       Transform a value from a linear to a logarithmic interval. Parameters:
           p value related to the linear interval [p1, p2]
           p1 first border of linear interval
           p2 second border of linear interval
           s1 first border of logarithmic interval
           s2 second border of logarithmic interval

       Returns:

           exp((p - p1) / (p2 - p1) * log(s2 / s1)) * s1;

   QwtScaleTransformation::Type QwtScaleTransformation::type () const [inline] Returns:
           Transformation type

   double QwtScaleTransformation::xForm (doubles, doubles1, doubles2, doublep1, doublep2) const [virtual]
       Transform a value between 2 linear intervals. Parameters:
           s value related to the interval [s1, s2]
           s1 first border of scale interval
           s2 second border of scale interval
           p1 first border of target interval
           p2 second border of target interval

       Returns:

           linear mapping:
               p1 + (p2 - p1) / (s2 - s1) * (s - s1)

           log10 mapping:
               p1 + (p2 - p1) / log(s2 / s1) * log(s / s1)

Author

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