docs: public static double selectZoomToShowAll(JComponent panel , int width , int height ) {
  		int w = panel.getWidth();
  		int h = panel.getHeight();
  		if( w == 0 ) {
  			w = panel.getPreferredSize().width;
  			h = panel.getPreferredSize().height;
  		}
  
  		double scale = Math.max(width/(double)w,height/(double)h);
  		if( scale > 1.0 ) {
  			return 1.0/scale;
  		} else {
  			return 1.0;
  		}
  	}