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

Detailed Description

       Operations for linear or logarithmic (base 10) transformations.

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 the coordinate system of the paint device into the coordinate
       system of a scale. Parameters:
           p Value related to the coordinate system of the paint device
           p1 First border of the coordinate system of the paint device
           p2 Second border of the coordinate system of the paint device
           s1 First border of the coordinate system of the scale
           s2 Second border of the coordinate system of the scale

       Returns:

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

           log10 mapping:
               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 from the coordinate system of a scale into the coordinate system of the
       paint device. Parameters:
           s Value related to the coordinate system of the scale
           s1 First border of the coordinate system of the scale
           s2 Second border of the coordinate system of the scale
           p1 First border of the coordinate system of the paint device
           p2 Second border of the coordinate system of the paint device

       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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