QwtPolarMagnifier provides zooming, by magnifying in steps.  
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#include <qwt_polar_magnifier.h>
QwtPolarMagnifier provides zooming, by magnifying in steps. 
Using QwtPlotMagnifier a plot can be zoomed in/out in steps using keys, the mouse wheel or moving a mouse button in vertical direction.
Together with QwtPolarPanner it is possible to implement an individual navigation of the plot canvas.
- See Also
- QwtPolarPanner, QwtPolarPlot, QwtPolarCanvas 
Constructor 
- Parameters
- 
  
    | canvas | Plot canvas to be magnified |  
 
 
 
- Returns
- Observed plot canvas 
 
 
- Returns
- Observed plot canvas 
 
 
      
        
          | void QwtPolarMagnifier::getUnzoomKey | ( | int & | key, | 
        
          |  |  | int & | modifiers | 
        
          |  | ) |  | const | 
      
 
 
  
  | 
        
          | void QwtPolarMagnifier::rescale | ( | double | factor | ) |  |  | protectedvirtual | 
 
Zoom in/out the zoomed area 
- Parameters
- 
  
    | factor | A value < 1.0 zooms in, a value > 1.0 zooms out. |  
 
 
 
      
        
          | void QwtPolarMagnifier::setUnzoomKey | ( | int | key, | 
        
          |  |  | int | modifiers | 
        
          |  | ) |  |  | 
      
 
Assign key and modifiers, that are used for unzooming The default combination is Qt::Key_Home + Qt::NoModifier.
- Parameters
- 
  
    | key | Key code |  | modifiers | Modifiers |  
 
- See Also
- getUnzoomKey(), QwtPolarPlot::unzoom() 
 
 
  
  | 
        
          | void QwtPolarMagnifier::widgetKeyPressEvent | ( | QKeyEvent * | event | ) |  |  | protectedvirtual | 
 
Handle a key press event for the observed widget.
- Parameters
-