class_docstr: Labelled arrow for use as a quiver plot scale key.
class_docstr_tok: ["Labelled","arrow","for","use","as","a","quiver","plot","scale","key","."]
code: def _set_transform(self):
      if self.coord == "data":
          self.set_transform(self.Q.ax.transData)
      elif self.coord == "axes":
          self.set_transform(self.Q.ax.transAxes)
      elif self.coord == "figure":
          self.set_transform(self.Q.ax.figure.transFigure)
      elif self.coord == "inches":
          self.set_transform(self.Q.ax.figure.dpi_scale_trans)
      else:
          raise ValueError("unrecognized coordinates")
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import six
  import math
  import weakref
  import numpy
  from numpy import ma
  import matplotlib.collections
  import matplotlib.transforms
  import matplotlib.text
  import matplotlib.artist
  from matplotlib.artist import allow_rasterization
  from matplotlib import docstring
  import matplotlib.font_manager
  from matplotlib.cbook import delete_masked_points
  from matplotlib.patches import CirclePolygon
label_desc: Use image node_id 7 for calling the QuiverKey obj's underlying member method code with example usage: obj._set_transform() without return types