Matplotlib具有类似于pgfplots的单个边颜色的堆叠条形图

Question

我有一些堆积的条形图，看起来像这样

但是我真的很喜欢跟其他颜色一样的边色，例如pgfplots

在Matplotlib中这是可能的（合理的）吗

import numpy as np
import matplotlib.pyplot as plt
import pandas as pd

test1 = np.array([51, 13.8, 15.5, np.NaN])
test2 = np.array([40.3, 30.4, 13.8, 15.5])

df = pd.DataFrame(dict(test1 = test1,
                       test2 = test2),
                  columns = ["test1","test2"]).T

ax = df.plot.barh(stacked = True, cmap = "coolwarm", edgecolor = "black", lw = 1, width = 0.8, figsize = (6,4))
plt.show()

Answer 1

首先，条的边缘是黑色的，因为您在对df.plot.barh的调用中设置了edgecolor = "black"。删除这意味着将没有edgecolor。您需要将每个条的edgecolor设置为条的facecolor

您可以通过遍历矩形面片（使用ax.patches获得）并使用^{}和^{}将edgecolor设置为facecolor来实现

test1 = np.array([51, 13.8, 15.5, np.NaN])
test2 = np.array([40.3, 30.4, 13.8, 15.5])

df = pd.DataFrame(dict(test1 = test1,
                       test2 = test2),
                  columns = ["test1","test2"]).T

ax = df.plot.barh(stacked = True, cmap = "coolwarm", lw = 1.5, width = 0.8, figsize = (6,4))

for rect in ax.patches:
    facecolor = list(rect.get_facecolor())
    rect.set_edgecolor(facecolor)

    facecolor[-1] = 0.5  # reduce alpha value of facecolor, but not of edgecolor
    rect.set_facecolor(facecolor)

plt.show()

它给出：