code: public static String envelope2WKT(org.locationtech.jts.geom.Envelope env) {
          GeometryFactory gf = GeometryUtilities.gf();
          Geometry geometry = gf.toGeometry(env);
          return geometry.toText();
      }
docs: Print the envelope as WKT.
  
  @param env
  the {@link org.locationtech.jts.geom.Envelope}.
  @return the WKT string.