[pie-drilldown] Drilldown Pie Chart with Click Navigation

[MarkusNeusinger]

A pie chart with hierarchical drilldown functionality - clicking a slice reveals a detailed breakdown of that category, with breadcrumb navigation to go back.

[claude]

✅ Spec ID: pie-drilldown

Rationale: This is a distinct interactive variant where clicking slices reveals sub-category breakdowns with breadcrumb navigation, unlike sunburst-basic or donut-nested which show all hierarchy levels simultaneously.

Add label approved to begin generation.

[github-actions]

✅ Specification Ready: pie-drilldown

PR: #3078

---

specification.md

pie-drilldown: Drilldown Pie Chart with Click Navigation

Description

A pie chart with hierarchical drilldown functionality that displays one level of data at a time. Clicking on any slice reveals a detailed breakdown of that category's subcategories as a new pie chart. Breadcrumb navigation allows users to traverse back up the hierarchy. This interactive visualization is ideal for exploring multi-level categorical data without the visual complexity of showing all levels simultaneously.

Applications

• Sales data exploration by region, then country, then city
• Budget breakdown from department to team to individual expense categories
• Website analytics drilling from traffic source to campaign to keyword
• Product category navigation from main category to subcategory to product line

Data

• id (string) - unique identifier for each node
• name (string) - display label for the category
• value (numeric) - value for leaf nodes (determines slice size)
• parent (string) - id of parent node (null/empty for root level)
• Size: 3-8 categories per level, 2-4 hierarchy levels
• Structure: hierarchical/tree with parent-child relationships

Notes

• Show breadcrumb trail at top (e.g., "All > Electronics > Phones")
• Include a "back" button or clickable breadcrumbs to navigate up
• Animate transitions when drilling down or up
• Display percentage and value labels on slices
• Use consistent color schemes within branches when possible
• Show a visual indicator (icon or cursor change) that slices are clickable

---

Next: Add approved label to merge this specification to main.

---

🤖 spec-create workflow

[github-actions]

🚀 Specification Merged!

Specification: pie-drilldown
PR: #3078 (merged)

The specification is now in main and synced to PostgreSQL.

---

Next: Add generate:{library} labels to start generating implementations.

Available libraries: matplotlib, seaborn, plotly, bokeh, altair, plotnine, pygal, highcharts, letsplot

Or use workflow dispatch for bulk operations.

---

🤖 spec-create workflow