How to Center Data Labels in Stacked Bar Charts?

Stacked Bar Chart with Centered Labels

Problem:
Attempting to center data labels in a stacked bar chart can be challenging, as simply centering the labels may not yield perfect results.

Solution 1: Pandas Bar Plot with bar_label()

• Utilize the pandas.DataFrame.plot.bar() or pandas.DataFrame.plot(kind='bar', stacked=True) methods.
• Use the matplotlib.pyplot.bar_label() function to automatically center the labels in the bars.

Solution 2: Explicit Labeling with Rectangle Properties

• Access the matplotlib.patches.Rectangle objects for each section using ax.patches.
• Calculate the height, width, x-coordinate, and y-coordinate for each rectangle.
• Create a label using f-strings, including additional text if desired.
• Plot the labels using ax.text(), aligning them in the center of the corresponding rectangles.

Solution 3: Seaborn Histplot

• Convert the dataframe to a long form using pandas.melt().
• Plot using seaborn.histplot() or seaborn.displot() with the parameters multiple='stack' and discrete=True.
• Access the patches using ax.containers and proceed with label creation and placement as in Solution 2.

Solution Notes:

• Customize labels for small segments by using ax.bar_label(c, labels=labels, label_type='center'), where labels is a list of labels corresponding to each rectangle.
• Use fmt=lambda x: f'{x:.0f}' to display numbers without decimal places in Solution 1.
• For horizontal stacked bars, use kind='barh' in pandas.plot() and modify the label calculation accordingly.

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