QwtLogTransform
Logarithmic transformation.
- Provided by: libqwt-doc (Version: 6.1.2-5)
- Source: qwt
- Report a bug
SYNOPSIS
#include <qwt_transform.h>
Inherits QwtTransform.
Public Member Functions
QwtLogTransform ()
Constructor. virtual ~QwtLogTransform ()
Destructor. virtual double transform (double value) const
virtual double invTransform (double value) const
virtual double bounded (double value) const
virtual QwtTransform * copy () const
Public Attributes
QT_STATIC_CONST double LogMin = 1.0e-150
Smallest allowed value for logarithmic scales: 1.0e-150.
QT_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.
Member Function Documentation
double QwtLogTransform::bounded (doublevalue) const [virtual]
Parameters:
value Value to be bounded
Returns:
qBound( LogMin, value, LogMax )
Reimplemented from QwtTransform.
QwtTransform * QwtLogTransform::copy () const [virtual]
Returns:
Clone of the transformation
Implements QwtTransform.
double QwtLogTransform::invTransform (doublevalue) const [virtual]
Parameters:
value Value to be transformed
Returns:
exp( value )
Implements QwtTransform.
double QwtLogTransform::transform (doublevalue) const [virtual]
Parameters:
value Value to be transformed
Returns:
log( value )
Implements QwtTransform.
Author
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