class_docstr: A subclass of :class:`~matplotlib.image.AxesImage` which provides an
  interface for getting a raster from the given object with interactive
  slippy map type functionality.
  
  Kwargs are passed to the AxesImage constructor.
code: def get_window_extent(self, renderer=None):
      return self.axes.get_window_extent(renderer=renderer)
  
file_path: cartopy/lib/cartopy/mpl/slippy_image_artist.py
imports: import matplotlib.artist
  from matplotlib.image import AxesImage
label_desc: Use image node_id 4 for calling the SlippyImageArtist obj's underlying member method code with example usage: obj.get_window_extent(renderer) and returns: self