Add split palette and hatching to violinplot?

Hi Seaborn devs,

I modified the violinplot for more flexible palette colouring and hatching when data is split by hue. Would you be interested in adding this functionality to violinplot? If so, I’d be happy to clean it up and make a PR.

Edit: to clarify, there is currently no way to colour by x-axis category when the hue keyword is given, and no current way to add hatching to any of the fills. The modifications are two new keywords, hatch=None and split_palette=False.

[mwaskom]

By the way here is a method for adding hatches without hacking/extending the violinplot function itself:

import seaborn as sns
import matplotlib as mpl

tips = sns.load_dataset("tips")

ax = sns.violinplot(x="day", y="total_bill", hue="sex", data=tips, split=True)
for i, violin in enumerate(ax.findobj(mpl.collections.PolyCollection)):
    if i % 2:
        violin.set_hatch("//")

ax.legend_.findobj(mpl.patches.Rectangle)[1].set_hatch("///")

[luyang-ai4med]

By the way here is a method for adding hatches without hacking/extending the violinplot function itself:

import seaborn as sns
import matplotlib as mpl

tips = sns.load_dataset("tips")

ax = sns.violinplot(x="day", y="total_bill", hue="sex", data=tips, split=True)
for i, violin in enumerate(ax.findobj(mpl.collections.PolyCollection)):
    if i % 2:
        violin.set_hatch("//")

ax.legend_.findobj(mpl.patches.Rectangle)[1].set_hatch("///")

This didn’t work completely for me, but instead I used: [c for c in ax.get_children() if isinstance(c, matplotlib.patches.Rectangle)][1].set_hatch(“//”)