How to Center Data Labels in a Stacked Bar Chart?

Stacked Bar Chart with Centered Labels

When attempting to center data labels in a stacked bar chart, you may encounter inaccuracy in the alignment of labels within the rectangles. This issue stems from the limitations of the used techniques.

In the following comprehensive response, we present two robust methods for achieving perfectly centered labels:

Method 1: Using Matplotlib's bar_label() Function

• This function automates the process of placing labels at the center of bars.
• It supports advanced customizations, such as label formatting and positioning.
• The syntax is simple and straightforward: bar_label(container, labels, label_type='center').
• Note that bar_label() was introduced in Matplotlib version 3.4.2.

Method 2: Iterating Over Rectangle Patches

• This approach involves iterating through the patches that make up the stacked bar chart.
• Each patch represents a section or rectangle of the bar.
• Using the patch's properties (x, y, width, and height), you can calculate the exact center and label accordingly.
• This method offers greater flexibility in customizing labels and allows for precise control over the labeling process.

Both methods effectively address the issue of uncentered labels and provide reliable solutions for creating visually appealing stacked bar charts with accurately placed data labels.

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