Qwt User's Guide  6.1.3
QwtPowerTransform Class Reference

A transformation using pow() More...

#include <qwt_transform.h>

Inheritance diagram for QwtPowerTransform:

Public Member Functions

 QwtPowerTransform (double exponent)
 
virtual ~QwtPowerTransform ()
 Destructor.
 
virtual double transform (double value) const
 
virtual double invTransform (double value) const
 
virtual QwtTransformcopy () const
 
- Public Member Functions inherited from QwtTransform
 QwtTransform ()
 Constructor.
 
virtual ~QwtTransform ()
 Destructor.
 
virtual double bounded (double value) 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 ( double  exponent)

Constructor

Parameters
exponentExponent

Member Function Documentation

QwtTransform * QwtPowerTransform::copy ( ) const
virtual
Returns
Clone of the transformation

Implements QwtTransform.

double QwtPowerTransform::invTransform ( double  value) const
virtual
Parameters
valueValue to be transformed
Returns
Inverse exponentiation preserving the sign

Implements QwtTransform.

double QwtPowerTransform::transform ( double  value) const
virtual
Parameters
valueValue to be transformed
Returns
Exponentiation preserving the sign

Implements QwtTransform.