python-3.x - 如何使用 mplcursors 在条形图上添加悬停注释

Question

如何修改此图以在鼠标悬停时向我显示每个条的值？

sns.barplot(x = "date", y = "no_of_dogs", data = dogs_adopted_per_day, palette="husl")
plt.show()

Answer 1

您可以按如下方式使用mplcursors ：

import matplotlib.pyplot as plt
import mplcursors
import numpy as np
import pandas as pd
import seaborn as sns

df = pd.DataFrame({"date": pd.date_range('20210101', periods=10),
                   "no_of_dogs": np.random.randint(10, 30, 10)})
fig, ax = plt.subplots(figsize=(15, 5))
sns.barplot(x="date", y="no_of_dogs", data=df, palette="husl", ax=ax)

x_dates = df['date'].dt.strftime('%Y-%m-%d')
ax.set_xticklabels(labels=x_dates)

cursor = mplcursors.cursor(hover=True)
@cursor.connect("add")
def on_add(sel):
    x, y, width, height = sel.artist[sel.target.index].get_bbox().bounds
    sel.annotation.set(text=f"{x_dates[round(x)]}\n{height:.0f}",
                       position=(0, 20), anncoords="offset points")
    sel.annotation.xy = (x + width / 2, y + height)

plt.show()