text: from __future__ import (absolute_import, division, print_function,
                          unicode_literals)
  
  from ..doctools import document
  from .geom_ribbon import geom_ribbon
  
  
  @document
  class geom_area(geom_ribbon):
      """
      Area plot
  
      An area plot is a special case of geom_ribbon,
      where the minimum of the range is fixed to 0,
      and the position adjustment defaults to 'stack'.
  
      {usage}
  
      Parameters
      ----------
      {common_parameters}
  
      See Also
      --------
      plotnine.geoms.geom_ribbon
      """
      REQUIRED_AES = {'x', 'y'}
      DEFAULT_PARAMS = {'stat': 'identity', 'position': 'stack',
                        'na_rm': False}
  
      def setup_data(self, data):
          data['ymin'] = 0
          data['ymax'] = data['y']
          return data
  