code: public void centerMovedTo(double lat, double lon) {
              final Coordinate newCenter = new Coordinate(lat, lon);
              if (logger.isTraceEnabled()) {
                  logger.trace("JS reports center value {}", newCenter);
              }
              lastCoordinateFromMap.set(newCenter);
              setCenter(newCenter);
          }
docs: called when the user has moved the map. the coordinates are EPSG:4326 (WGS) values. The arguments are double
  primitives and no Double objects.
  
  @param lat
  new latitude value
  @param lon
  new longitude value