code: def move(self, i, lat, lng, change_time=True):
          '''move a fence point'''
          if i < 0 or i >= self.count():
              print("Invalid fence point number %u" % i)
          self.points[i].lat = lat
          self.points[i].lng = lng
          # ensure we close the polygon
          if i == 1:
                  self.points[self.count()-1].lat = lat
                  self.points[self.count()-1].lng = lng
          if i == self.count() - 1:
                  self.points[1].lat = lat
                  self.points[1].lng = lng
          if change_time:
              self.last_change = time.time(f move(self, i, lat, lng, change_time=True):
          '''move a fence point'''
          if i < 0 or i >= self.count():
              print("Invalid fence point number %u" % i)
          self.points[i].lat = lat
          self.points[i].lng = lng
          # ensure we close the polygon
          if i == 1:
                  self.points[self.count()-1].lat = lat
                  self.points[self.count()-1].lng = lng
          if i == self.count() - 1:
                  self.points[1].lat = lat
                  self.points[1].lng = lng
          if change_time:
              self.last_change = time.time()
docs: move a fence point