docstr: Get the drawing transform for our gridlines.
  
  Note
  ----
      The drawing transform depends on the transform of our 'axes', so
      it may change dynamically.
code: def _crs_transform(self):
      """
      Get the drawing transform for our gridlines.
  
      Note
      ----
          The drawing transform depends on the transform of our 'axes', so
          it may change dynamically.
  
      """
      transform = self.crs
      if not isinstance(transform, mtrans.Transform):
          transform = transform._as_mpl_transform(self.axes)
      return transform
  
imports: import itertools
  import operator
  import warnings
  import matplotlib
  import matplotlib.artist
  import matplotlib.collections
  import matplotlib.text
  import matplotlib.ticker
  import matplotlib.transforms
  import numpy
  import shapely.geometry
  import cartopy
  from cartopy.crs import PlateCarree, Projection, _RectangularProjection
  from cartopy.mpl.ticker import LatitudeFormatter, LatitudeLocator, LongitudeFormatter, LongitudeLocator
label_desc: Use image node_id 13 for calling the Gridliner obj's underlying member method code with example usage: obj._crs_transform() and returns: transform