Logarithmic transformation. More...
#include <qwt_transform.h>
Public Member Functions | |
| virtual double | bounded (double value) const |
| virtual QwtTransform * | copy () const |
| virtual double | invTransform (double value) const |
| QwtLogTransform () | |
| Constructor. | |
| virtual double | transform (double value) const |
| virtual | ~QwtLogTransform () |
| Destructor. | |
Static Public Attributes | |
| static const double | LogMax = 1.0e150 |
| Largest allowed value for logarithmic scales: 1.0e150. | |
| static const double | LogMin = 1.0e-150 |
| Smallest allowed value for logarithmic scales: 1.0e-150. | |
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
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.
The documentation for this class was generated from the following files: