[vtkusers] Compute zoom level (VTK)

[nihel]

I'm using VTK to manipulate DICOM images series en 3D. I used this mouse
listener to zoom the image : 

    ML_Zoom = new MouseListener() { 
                @Override 
                public void mouseClicked(MouseEvent e) { 
                } 
    
                @Override 
                public void mousePressed(MouseEvent e) { 
    
                    button = (int) e.getButton(); 
                    if (button == 1) { 
                        for (int i = 0; i < 3; i++) { 
                            style[i].EndSpin(); 
                            style[i].EndPan(); 
                            style[i].EndDolly();                       
                            style[i] = new vtkInteractorStyleImage(); 
                            iren[i].SetInteractorStyle(style[i]); 
                            style[i].StartDolly();                     
                        }               
                    }               
                } 
    
                @Override 
                public void mouseReleased(MouseEvent e) { 
                      
                    for (int i = 0; i < 3; i++) { 
                        style[i].EndDolly(); 
                      
                    }                                   
                } 
    
                @Override 
                public void mouseEntered(MouseEvent e) { 
                } 
    
                @Override 
                public void mouseExited(MouseEvent e) { 
                } 
            }; 

How can I compute zoom level ?



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