Logarithmic transformation.
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#include <qwt_transform.h>
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QT_STATIC_CONST double | LogMin = 1.0e-150 |
| Smallest allowed value for logarithmic scales: 1.0e-150.
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QT_STATIC_CONST double | LogMax = 1.0e150 |
| Largest allowed value for logarithmic scales: 1.0e150.
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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.
◆ bounded()
double QwtLogTransform::bounded |
( |
double |
value | ) |
const |
|
virtual |
- Parameters
-
- Returns
- qBound( LogMin, value, LogMax )
Reimplemented from QwtTransform.
◆ copy()
◆ invTransform()
double QwtLogTransform::invTransform |
( |
double |
value | ) |
const |
|
virtual |
- Parameters
-
value | Value to be transformed |
- Returns
- exp( value )
Implements QwtTransform.
◆ transform()
double QwtLogTransform::transform |
( |
double |
value | ) |
const |
|
virtual |
- Parameters
-
value | Value to be transformed |
- Returns
- log( value )
Implements QwtTransform.