code: def _init_glyph(self, plot, mapping, properties):
          
          properties = mpl_to_bokeh(properties)
          properties = dict(properties, **mapping)
          if 'xs' in mapping:
              renderer = plot.patches(**properties)
          else:
              renderer = plot.quad(**properties)
          if self.colorbar and 'color_mapper' in self.handles:
              self._draw_colorbar(plot, self.handles['color_mapper'])
          return renderer, renderer.glyph
docs: Returns a Bokeh glyph object.