QwtScaleTransformation

NAME

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

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

Index

NAME

SYNOPSIS

Public Types

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

QwtScaleTransformation::QwtScaleTransformation (Type type)

QwtScaleTransformation::~QwtScaleTransformation () [virtual]

Member Function Documentation

QwtScaleTransformation * QwtScaleTransformation::copy () const [virtual]

double QwtScaleTransformation::invXForm (double p, double p1, double p2, double s1, double s2) const [virtual]

Type QwtScaleTransformation::type () const [inline]

double QwtScaleTransformation::xForm (double s, double s1, double s2, double p1, double p2) const [virtual]

Author