code: private void nodeProperties(Options opt) {
  	Options def = opt.getGlobalOptions();
  	if (opt.nodeFontName != def.nodeFontName)
  	    w.print(",fontname=\"" + opt.nodeFontName + "\"");
  	if (opt.nodeFontColor != def.nodeFontColor)
  	    w.print(",fontcolor=\"" + opt.nodeFontColor + "\"");
  	if (opt.nodeFontSize != def.nodeFontSize)
  	    w.print(",fontsize=" + fmt(opt.nodeFontSize));
  	w.print(opt.shape.style);
  	w.println("];");
      }
docs: Print the common class node's properties