code: def set_position(self, key, latlon, layer=None, rotation=0):
          '''move an object on the map'''
          self.object_queue.put(SlipPosition(key, latlon, layer, rotation)f set_position(self, key, latlon, layer=None, rotation=0):
          '''move an object on the map'''
          self.object_queue.put(SlipPosition(key, latlon, layer, rotation))
docs: move an object on the map