text: class Clock:
      def __init__(self,area):
          self.area=area
      def clock(self,feature):
          if 'geometries' in feature:
              feature['geometries'] = map(self.clock_geometry,feature['geometries'])
          elif 'geometry' in feature:
              feature['geometry']=self.clock_geometry(feature['geometry'])
          return feature
      def clock_geometry(self,geo):
          if 'type' in geo:
              if geo['type']=='Polygon' or geo['type']=='MultiLineString':
                  geo['coordinates'] = self.clockwise_polygon(geo['coordinates'])
              elif geo['type']=='MultiPolygon':
                  geo['coordinates'] = map(lambda x:self.clockwise_polygon(x),geo['coordinates'])
              elif geo['type']=='LineString':
                  geo['coordinates'] = self.clockwise_ring(geo['coordinates'])
          return geo
      def clockwise_polygon(self,rings):
          return map(lambda x:self.clockwise_ring(x),rings)
      def clockwise_ring(self,ring):
          if self.area(ring) > 0:
              return list(reversed(ring))
          else:
              return ring
  