/**
  * Get the contour label font. Use associated <code>ContourLineAttribute</code> if it exists and
  * has labelFontOverrideen set to <code>false</code>.
  */
 public Font getLabelFont() {
   if (attr_ != null && attr_.isLabelFontOverridden()) {
     return attr_.getLabelFont();
   } else {
     return labelFont_;
   }
 }