A transformation using pow()  
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#include <qwt_transform.h>
A transformation using pow() 
QwtPowerTransform preserves the sign of a value. F.e. a transformation with a factor of 2 transforms a value of -3 to -9 and v.v. Thus QwtPowerTransform can be used for scales including negative values. 
      
        
          | QwtPowerTransform::QwtPowerTransform | ( | double | exponent | ) |  | 
      
 
 
  
  | 
        
          | double QwtPowerTransform::invTransform | ( | double | value | ) | const |  | virtual | 
 
- Parameters
- 
  
    | value | Value to be transformed |  
 
- Returns
- Inverse exponentiation preserving the sign 
Implements QwtTransform.
 
 
  
  | 
        
          | double QwtPowerTransform::transform | ( | double | value | ) | const |  | virtual | 
 
- Parameters
- 
  
    | value | Value to be transformed |  
 
- Returns
- Exponentiation preserving the sign 
Implements QwtTransform.