QwtLogTransform Class Reference

Logarithmic transformation. More...

#include <qwt_transform.h>

Inheritance diagram for QwtLogTransform:

Public Member Functions
virtual double	bounded (double value) const
virtual QwtTransform *	copy () const
virtual double	invTransform (double value) const
	QwtLogTransform ()
	Constructor. More...
virtual double	transform (double value) const
virtual	~QwtLogTransform ()
	Destructor. More...
Public Member Functions inherited from QwtTransform
	QwtTransform ()
	Constructor. More...
virtual	~QwtTransform ()
	Destructor. More...

Static Public Attributes
static const double	LogMax = 1.0e150
	Largest allowed value for logarithmic scales: 1.0e150. More...
static const double	LogMin = 1.0e-150
	Smallest allowed value for logarithmic scales: 1.0e-150. More...

Detailed Description

Logarithmic transformation.

QwtLogTransform modifies the values using log() and exp().

Note

In the calculations of QwtScaleMap the base of the log function has no effect on the mapping. So QwtLogTransform can be used for log2(), log10() or any other logarithmic scale.

Definition at line 100 of file qwt_transform.h.

Constructor & Destructor Documentation

QwtLogTransform::QwtLogTransform

(

)

Constructor.

Definition at line 78 of file qwt_transform.cpp.

QwtLogTransform::~QwtLogTransform ( )

virtual

Destructor.

Definition at line 84 of file qwt_transform.cpp.

Member Function Documentation

double QwtLogTransform::bounded ( double  value ) const

virtual

Parameters

value

Value to be bounded

Returns

qBound( LogMin, value, LogMax )

Reimplemented from QwtTransform.

Definition at line 110 of file qwt_transform.cpp.

QwtTransform * QwtLogTransform::copy ( ) const

virtual

Returns

Clone of the transformation

Implements QwtTransform.

Definition at line 116 of file qwt_transform.cpp.

double QwtLogTransform::invTransform ( double  value ) const

virtual

Parameters

value

Value to be transformed

Returns

exp( value )

Implements QwtTransform.

Definition at line 101 of file qwt_transform.cpp.

double QwtLogTransform::transform ( double  value ) const

virtual

Parameters

value

Value to be transformed

Returns

log( value )

Implements QwtTransform.

Definition at line 92 of file qwt_transform.cpp.

Member Data Documentation

const double QwtLogTransform::LogMax = 1.0e150

static

Largest allowed value for logarithmic scales: 1.0e150.

Definition at line 114 of file qwt_transform.h.

const double QwtLogTransform::LogMin = 1.0e-150

static

Smallest allowed value for logarithmic scales: 1.0e-150.

Definition at line 113 of file qwt_transform.h.

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The documentation for this class was generated from the following files:

• qwt_transform.h
• qwt_transform.cpp