code: public void extentSelected(double latMin, double lonMin, double latMax, double lonMax) {
              final Extent extent = Extent.forCoordinates(new Coordinate(latMin, lonMin), new Coordinate(latMax, lonMax));
              if (logger.isTraceEnabled()) {
                  logger.trace("JS reports extend selected: {}", extent);
              }
              fireEvent(new MapViewEvent(MapViewEvent.MAP_EXTENT, extent));
          }
docs: called when the user selected an extent by dragging the mouse with modifier pressed.
  
  @param latMin
  latitude of upper left corner
  @param lonMin
  longitude of upper left corner
  @param latMax
  latitude of lower right corner
  @param lonMax
  longitude of lower right corner