# adapted from my Stackoverflow answer
# https://stackoverflow.com/questions/43021593/how-can-i-export-legend-markers-from-matplotlib-one-at-a-time/43028174#43028174
import matplotlib.pyplot as plt
import numpy as np; np.random.seed(422)
plt.rcParams["legend.labelspacing"] = .7


markers= dict((k,v) for k,v in plt.Line2D.markers.items())
markers.update({"$f$" : "mathtext"})


fig, ax = plt.subplots(dpi=100)
for i, (k,v) in enumerate(markers.items()):
    if v=="nothing": continue
    print("{:02d}".format(i), k,v)
    ax.plot([0,1], [i,i], linestyle="", marker=k, ms=8, label=v, color="C0")

leg = ax.legend(framealpha=1, ncol=3)

def export_legend_handles(fig, leg, filename=None, ext=[".pdf", ".png"], d = [0,0,0,3]):
    """ d = [left, bottom, right, top] pixel to add in the respective dimension """
    import matplotlib.transforms as mtransforms
    boxes = []
    fig.canvas.draw()
    trans = fig.dpi_scale_trans.inverted()
    for vpack in leg._legend_handle_box.get_children():
        for hpack in vpack.get_children():
            drawbox = hpack.get_children()[0]
            w, h, xd, yd = drawbox.get_extent(fig.canvas.get_renderer())
            ox, oy = drawbox.get_offset()  
            pixbox = mtransforms.Bbox.from_bounds(ox-d[0],oy-d[1],w+d[0]+d[2],h+d[1]+d[3])
            inchbox = pixbox.transformed(trans) 
            boxes.append(inchbox)

    filename = filename if filename else __file__[:-3]
    for i, box in enumerate(boxes):
        for ex in ext:
            plt.savefig("{}{:02d}{}".format(filename,i,ex), dpi="figure", bbox_inches=box)

export_legend_handles(fig, leg, filename="m", ext = [".png"], d = [-2,5,-2,5])


def print_mix():
    s = ".. |m{:02d}| image:: /_static/markers/m{:02d}.png"
    for i  in range(42):
        print(s.format(i,i))
print_mix()
plt.show()