[donut-labeled] Donut chart with percentage labels

[MarkusNeusinger]

A donut chart (ring chart) showing categorical data distribution with percentage labels displayed on each segment.

Use case: Budget allocation, market share, survey responses

Key features:

• Central hole (donut style, not pie)
• Percentage labels on segments
• Clean legend
• 5-6 categories

[claude]

✅ Spec Ready: donut-labeled

Branch: plot/donut-labeled

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Analysis

Why this spec makes sense:
Donut charts are a modern, cleaner alternative to pie charts that emphasize segment comparison over center focus. The hollow center reduces visual clutter and can optionally display summary text, while percentage labels directly on segments improve readability compared to legend-only approaches.

Spec-ID reasoning:

• donut - the plot type (ring chart, distinct from solid pie)
• labeled - the key feature variant (percentage labels on segments)

Similar existing specs:

• pie-basic - Standard filled pie chart. The donut variant differs by having a central hole (typically 50-60% inner radius) and explicitly requires percentage labels on segments rather than just a legend.

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spec.md

# donut-labeled: Donut Chart with Percentage Labels

## Description

A ring-shaped chart (donut chart) displaying categorical data distribution with percentage labels on each segment. The central hole distinguishes it from traditional pie charts, creating a cleaner aesthetic that draws attention to the segments rather than the center. Percentage labels directly on each slice make values immediately readable without requiring legend lookup.

## Applications

- Budget allocation visualization showing department spending percentages
- Market share distribution comparing competitor portions
- Survey response breakdown displaying answer frequencies
- Portfolio composition showing investment category weights

## Data

- `category` (categorical) - descriptive name for each segment
- `value` (numeric) - raw value or percentage for each category
- Size: 5-6 categories for optimal readability
- Example: departmental budget allocation or market share data

## Notes

- Inner radius should be approximately 50-60% of outer radius for classic donut appearance
- Percentage labels should be positioned on or near each segment for clarity
- Include a clean legend for category names
- Consider using a cohesive color palette with sufficient contrast between adjacent segments

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Next: Add approved label to start code generation.

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🤖 plot-prepare workflow

[github-actions]

🚀 Implementation Status

Library	Status	PR	Quality
matplotlib	✅ Done	#552	-
seaborn	✅ Done	#553	-
plotnine	✅ Done	#554	-
plotly	✅ Done	#555	-
bokeh	✅ Done	#557	-
altair	✅ Done	#556	-
highcharts	✅ Done	#559	-
pygal	❌ Failed	-	-
letsplot	✅ Done	#560	-

⚠️ 8/9 libraries completed - check failed jobs

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🤖 plot-generate workflow

[github-actions]

🎨 matplotlib Preview

PR: #552

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🤖 plot-generator

[github-actions]

🎨 seaborn Preview

PR: #553

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🤖 plot-generator

[github-actions]

🎨 plotnine Preview

PR: #554

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🤖 plot-generator