SYNOPSIS

#include <qwt_transform.h>

Inherits QwtTransform.

Public Member Functions

QwtPowerTransform (double exponent)

virtual ~QwtPowerTransform ()
Destructor.
virtual double transform (double value) const

virtual double invTransform (double value) const

virtual QwtTransform * copy () const

Detailed Description

A transformation using pow()

QwtPowerTransform preserves the sign of a value. F.e. a transformation with a factor of 2 transforms a value of -3 to -9 and v.v. Thus QwtPowerTransform can be used for scales including negative values.

Constructor & Destructor Documentation

QwtPowerTransform::QwtPowerTransform (doubleexponent)

Parameters:

exponent Exponent

Member Function Documentation

QwtTransform * QwtPowerTransform::copy () const [virtual]

Returns:

Clone of the transformation

Implements QwtTransform.

double QwtPowerTransform::invTransform (doublevalue) const [virtual]

Parameters:

value Value to be transformed

Returns:

Inverse exponentiation preserving the sign

Implements QwtTransform.

double QwtPowerTransform::transform (doublevalue) const [virtual]

Parameters:

value Value to be transformed

Returns:

Exponentiation preserving the sign

Implements QwtTransform.

Author

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