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 QwtTransform *	copy () 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

exponent

Exponent

Member Function Documentation

QwtTransform * QwtPowerTransform::copy ( ) const

virtual

Returns

Clone of the transformation

Implements QwtTransform.

double QwtPowerTransform::invTransform ( double  value ) const

virtual

Parameters

value

Value to be transformed

Returns

Inverse exponentiation preserving the sign

Implements QwtTransform.

double QwtPowerTransform::transform ( double  value ) const

virtual

Parameters

value

Value to be transformed

Returns

Exponentiation preserving the sign

Implements QwtTransform.