code: def legend_artist(self, legend, orig_handle, fontsize, handlebox):
      x0, y0 = handlebox.xdescent, handlebox.ydescent
      width, height = handlebox.width, handlebox.height
      patch = mpatches.Rectangle(
          [x0, y0],
          width,
          height,
          facecolor="red",
          edgecolor="black",
          hatch="xx",
          lw=3,
          transform=handlebox.get_transform(),
      )
      handlebox.add_artist(patch)
      return patch
  
file_path: matplotlib/galleries/users_explain/axes/legend_guide.py
imports: import matplotlib.pyplot
  import matplotlib.patches
  import matplotlib.lines
  from matplotlib.legend_handler import HandlerLine2D
  from numpy.random import randn
  from matplotlib.legend_handler import HandlerLine2D, HandlerTuple
  import matplotlib.patches
  from matplotlib.legend_handler import HandlerPatch
label_desc: Use image node_id 1 for calling the AnyObjectHandler obj's underlying member method code with example usage: obj.legend_artist(legend, orig_handle, fontsize, handlebox) and returns: patch