code: public Point2D getEventAdjusted()
      {
          final Point2D viewportLoc = new Point2D(getEventX(), getEventY());
  
          m_vtog.transform(viewportLoc, viewportLoc);
  
          return viewportLoc;
      }
docs: Returns the event in viewport coordinates - i.e. viewport.transform.inverse(event(x,y)) of last drag move
  
  @return