Logarithmic transformation.  
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#include <qwt_transform.h>
|  | 
| 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. 
 | 
|  | 
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. 
  
  | 
        
          | double QwtLogTransform::bounded | ( | double | value | ) | const |  | virtual | 
 
- Parameters
- 
  
  
- Returns
- qBound( LogMin, value, LogMax ) 
Reimplemented from QwtTransform.
 
 
  
  | 
        
          | double QwtLogTransform::invTransform | ( | double | value | ) | const |  | virtual | 
 
- Parameters
- 
  
    | value | Value to be transformed |  
 
- Returns
- exp( value ) 
Implements QwtTransform.
 
 
  
  | 
        
          | double QwtLogTransform::transform | ( | double | value | ) | const |  | virtual | 
 
- Parameters
- 
  
    | value | Value to be transformed |  
 
- Returns
- log( value ) 
Implements QwtTransform.