code: def translate(self, dx, dy):
          
          vec = numpy.array((dx, dy))
          self.polygons = [points + vec for points in self.polygons]
          return self
docs: Move the polygons from one place to another
  
          Parameters
          ----------
          dx : number
              distance to move in the x-direction
          dy : number
              distance to move in the y-direction
  
          Returns
          -------
          out : ``PolygonSet``
              This object.