QwtLogTransform - Man Page
Logarithmic transformation.
Synopsis
#include <qwt_transform.h>
Inherits QwtTransform.
Public Member Functions
QwtLogTransform ()
Constructor.
virtual ~QwtLogTransform ()
Destructor.
virtual double transform (double value) const override
virtual double invTransform (double value) const override
virtual double bounded (double value) const override
virtual QwtTransform * copy () const override
Static Public Attributes
static const double LogMin = 1.0e-150
Smallest allowed value for logarithmic scales: 1.0e-150.
static const double LogMax = 1.0e150
Largest allowed value for logarithmic scales: 1.0e150.
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.
Member Function Documentation
double QwtLogTransform::bounded (double value) const [override], [virtual]
- Parameters
value Value to be bounded
- Returns
qBound( LogMin, value, LogMax )
Reimplemented from QwtTransform.
Definition at line 106 of file qwt_transform.cpp.
QwtTransform * QwtLogTransform::copy () const [override], [virtual]
- Returns
Clone of the transformation
Implements QwtTransform.
Definition at line 112 of file qwt_transform.cpp.
double QwtLogTransform::invTransform (double value) const [override], [virtual]
- Parameters
value Value to be transformed
- Returns
exp( value )
Implements QwtTransform.
Definition at line 97 of file qwt_transform.cpp.
double QwtLogTransform::transform (double value) const [override], [virtual]
- Parameters
value Value to be transformed
- Returns
log( value )
Implements QwtTransform.
Definition at line 88 of file qwt_transform.cpp.
Author
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