QwtScaleTransformation - Operations for linear or logarithmic (base 10)

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.

Constructor & Destructor Documentation

   QwtScaleTransformation::QwtScaleTransformation (Type type)
       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 (double p, double p1, double p2,
       double s1, double s2) const [virtual]
       Transform a value from a linear to a logarithmic interval.

       Parameters:
           x value related to the linear interval [p1, p2]
           p1 first border of linear interval
           p2 first border of linear interval
           s1 first border of logarithmic interval
           s2 first border of logarithmic interval

       Returns:

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

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

   double QwtScaleTransformation::xForm (double s, double s1, double s2,
       double p1, double p2) const [virtual]
       Transform a value between 2 linear intervals.

       Parameters:
           x value related to the interval [x1, x2]
           x1 first border of source interval
           x2 first border of source interval
           y1 first border of target interval
           y2 first border of target interval

       Returns:

           linear mapping:
               y1 + (y2 - y1) / (x2 - x1) * (x - x1)

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

Author

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