QwtScaleTransformation (3) - Linux Man Pages

QwtScaleTransformation: Operations for linear or logarithmic (base 10) transformations.

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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