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feat(pygal): implement sunburst-basic (#5683)
## Implementation: `sunburst-basic` - python/pygal Implements the **python/pygal** version of `sunburst-basic`. **File:** `plots/sunburst-basic/implementations/python/pygal.py` **Parent Issue:** #821 --- :robot: *[impl-generate workflow](https://github.com/MarkusNeusinger/anyplot/actions/runs/25347406390)* --------- Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com> Co-authored-by: Markus Neusinger <2921697+MarkusNeusinger@users.noreply.github.com>
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‎plots/sunburst-basic/implementations/python/pygal.py‎

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""" anyplot.ai
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sunburst-basic: Basic Sunburst Chart
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Library: pygal 3.1.0 | Python 3.13.13
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Quality: 73/100 | Created: 2026-05-04
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"""
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import os
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import pygal
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from pygal.style import Style
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THEME = os.getenv("ANYPLOT_THEME", "light")
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PAGE_BG = "#FAF8F1" if THEME == "light" else "#1A1A17"
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INK = "#1A1A17" if THEME == "light" else "#F0EFE8"
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INK_MUTED = "#6B6A63" if THEME == "light" else "#A8A79F"
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OKABE_ITO = ("#009E73", "#D55E00", "#0072B2", "#CC79A7", "#E69F00", "#56B4E9", "#F0E442")
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custom_style = Style(
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background=PAGE_BG,
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plot_background=PAGE_BG,
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foreground=INK,
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foreground_strong=INK,
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foreground_subtle=INK_MUTED,
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colors=OKABE_ITO,
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title_font_size=72,
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label_font_size=40,
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major_label_font_size=36,
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legend_font_size=40,
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value_font_size=32,
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stroke_width=2,
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)
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# Organizational budget breakdown (in $K)
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# Each department: (name, primary_color, [(team, team_color, value), ...])
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# Team colors are shades of their parent department color
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departments = [
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(
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"Technology",
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"#009E73",
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[
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("Backend Engineering", "#009E73", 180),
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("Frontend Engineering", "#40B88E", 140),
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("Data Science", "#7DD3AB", 100),
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],
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),
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("Business", "#D55E00", [("Sales", "#D55E00", 150), ("Finance", "#E07D33", 100), ("Legal", "#EB9C66", 60)]),
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("Operations", "#0072B2", [("IT Support", "#0072B2", 90), ("Human Resources", "#3396C8", 80)]),
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("Marketing", "#CC79A7", [("Brand Design", "#CC79A7", 60), ("Digital Marketing", "#D99ABD", 40)]),
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]
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# pygal.Pie with multiple series creates concentric rings — a sunburst chart
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# inner_radius=0.4 creates a donut; first series = inner ring (departments)
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chart = pygal.Pie(
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style=custom_style,
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width=3600,
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height=3600,
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title="sunburst-basic · pygal · anyplot.ai",
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inner_radius=0.4,
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show_legend=True,
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legend_at_bottom=True,
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legend_at_bottom_columns=4,
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print_values=False,
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)
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# Inner ring: department totals — each slice color matches the department
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chart.add(
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"Departments",
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[{"value": sum(v for _, _, v in teams), "label": name, "color": color} for name, color, teams in departments],
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)
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# Outer ring: individual teams — shades of their parent department color
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chart.add(
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"Teams",
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[{"value": value, "label": name, "color": color} for _, _, teams in departments for name, color, value in teams],
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)
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chart.render_to_png(f"plot-{THEME}.png")
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with open(f"plot-{THEME}.html", "wb") as f:
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f.write(chart.render())

‎plots/sunburst-basic/metadata/python/pygal.yaml‎

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library: pygal
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language: python
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specification_id: sunburst-basic
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created: '2026-05-04T22:56:10Z'
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updated: '2026-05-04T23:52:15Z'
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generated_by: claude-sonnet
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workflow_run: 25347406390
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issue: 821
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python_version: 3.13.13
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library_version: 3.1.0
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preview_url_light: https://storage.googleapis.com/anyplot-images/plots/sunburst-basic/python/pygal/plot-light.png
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preview_url_dark: https://storage.googleapis.com/anyplot-images/plots/sunburst-basic/python/pygal/plot-dark.png
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preview_html_light: https://storage.googleapis.com/anyplot-images/plots/sunburst-basic/python/pygal/plot-light.html
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preview_html_dark: https://storage.googleapis.com/anyplot-images/plots/sunburst-basic/python/pygal/plot-dark.html
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quality_score: 73
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review:
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strengths:
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- Correct sunburst simulation using pygal multi-series Pie API
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- Color-shading hierarchy connects team segments visually to parent departments
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- Proper theme-adaptive chrome with correct backgrounds and foreground tokens for
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both themes
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- Deterministic flat code with clean imports and list comprehensions
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- HTML interactive output provides hover labels and full interactivity
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weaknesses:
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- No segment labels visible in static PNG render — major segments should be labeled
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even in static output
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- Legend declared but not rendered in PNG export by cairosvg — remove or accept
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HTML-only legend
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- Only 2 hierarchy levels used; a 3rd tier would better showcase the spec range
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of 2-4 levels
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image_description: |-
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Light render (plot-light.png):
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Background: warm off-white #FAF8F1 — correct
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Chrome: title "sunburst-basic · pygal · anyplot.ai" in dark text, clearly readable at top; no segment labels or tick labels present
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Data: inner ring shows 4 department slices in Okabe-Ito #009E73 (green/Technology), #D55E00 (orange-vermillion/Business), #0072B2 (blue/Operations), #CC79A7 (pink-purple/Marketing); outer ring shows shaded tint variants of each parent color for team segments; no legend visible in PNG
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Legibility verdict: PASS (title readable; segment labels absent but not a legibility failure for text that exists)
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Dark render (plot-dark.png):
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Background: near-black #1A1A17 — correct
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Chrome: title in light text, clearly legible against dark background; no dark-on-dark failures detected
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Data: same segment positions and proportions as light render; Okabe-Ito hues consistent between themes (only chrome flips); legend again absent in PNG
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Legibility verdict: PASS
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criteria_checklist:
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visual_quality:
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score: 24
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max: 30
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items:
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- id: VQ-01
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name: Text Legibility
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score: 4
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max: 8
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passed: false
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comment: Title readable in both themes but no segment labels visible in static
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PNG render
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- id: VQ-02
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name: No Overlap
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score: 6
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max: 6
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passed: true
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comment: Clean ring layout, no overlapping elements
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- id: VQ-03
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name: Element Visibility
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score: 5
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max: 6
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passed: true
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comment: All ring segments clearly visible and distinctly colored; minor deduction
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for absent labels
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- id: VQ-04
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name: Color Accessibility
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score: 2
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max: 2
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passed: true
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comment: Okabe-Ito palette; CVD-safe
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- id: VQ-05
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name: Layout & Canvas
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score: 3
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max: 4
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passed: true
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comment: Good canvas fill; legend declared but absent in static render
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- id: VQ-06
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name: Axis Labels & Title
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score: 2
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max: 2
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passed: true
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comment: Correct title format; no axis labels needed for sunburst
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- id: VQ-07
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name: Palette Compliance
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score: 2
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max: 2
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passed: true
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comment: 'Light #FAF8F1 and dark #1A1A17 backgrounds correct; first series
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#009E73; Okabe-Ito order 1-4'
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design_excellence:
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score: 8
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max: 20
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items:
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- id: DE-01
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name: Aesthetic Sophistication
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score: 4
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max: 8
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passed: false
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comment: Color-shading hierarchy is intentional but overall design uses default
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pygal styling
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- id: DE-02
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name: Visual Refinement
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score: 2
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max: 6
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passed: false
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comment: Pie chart type leaves little room for spine removal; minimal chrome
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customization
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- id: DE-03
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name: Data Storytelling
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score: 2
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max: 6
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passed: false
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comment: Two-ring structure conveys hierarchy but no focal point or narrative
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emphasis
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spec_compliance:
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score: 11
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max: 15
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items:
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- id: SC-01
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name: Plot Type
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score: 4
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max: 5
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passed: true
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comment: pygal.Pie multi-series correctly simulates sunburst; not native but
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idiomatic pygal approach
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- id: SC-02
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name: Required Features
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score: 2
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max: 4
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passed: false
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comment: Branch colors consistent, ring separation clear, inner segments encompass
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children; major segment labels missing from static PNG
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- id: SC-03
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name: Data Mapping
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score: 3
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max: 3
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passed: true
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comment: Department totals in inner ring, teams in outer ring; proportional
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to values
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- id: SC-04
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name: Title & Legend
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score: 2
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max: 3
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passed: true
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comment: Title format correct; legend declared but absent from static PNG
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render
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data_quality:
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score: 13
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max: 15
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items:
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- id: DQ-01
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name: Feature Coverage
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score: 4
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max: 6
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passed: true
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comment: 2 hierarchy levels demonstrated; spec allows 2-4; a 3rd tier would
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earn full marks
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- id: DQ-02
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name: Realistic Context
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score: 5
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max: 5
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passed: true
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comment: Organizational budget breakdown is realistic, plausible, and neutral
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- id: DQ-03
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name: Appropriate Scale
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score: 4
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max: 4
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passed: true
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comment: Values 40-180 $K are sensible for team-level budgets
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code_quality:
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score: 10
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max: 10
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items:
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- id: CQ-01
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name: KISS Structure
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score: 3
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max: 3
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passed: true
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comment: Flat linear script, no functions or classes
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- id: CQ-02
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name: Reproducibility
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score: 2
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max: 2
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passed: true
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comment: Fully deterministic; no random elements
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- id: CQ-03
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name: Clean Imports
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score: 2
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max: 2
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passed: true
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comment: Only os, pygal, pygal.style.Style imported and used
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- id: CQ-04
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name: Code Elegance
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score: 2
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max: 2
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passed: true
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comment: List comprehensions for data series are concise and readable
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- id: CQ-05
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name: Output & API
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score: 1
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max: 1
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passed: true
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comment: Saves plot-{THEME}.png and plot-{THEME}.html; correct pygal pattern
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library_mastery:
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score: 7
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max: 10
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items:
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- id: LM-01
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name: Idiomatic Usage
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score: 4
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max: 5
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passed: true
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comment: Multi-series pygal.Pie for concentric rings is idiomatic; Style object
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properly carries all theme tokens
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- id: LM-02
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name: Distinctive Features
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score: 3
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max: 5
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passed: true
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comment: Uses pygal HTML interactive output for labeling; leverages per-datum
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color overrides via dict format
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verdict: APPROVED
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impl_tags:
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dependencies: []
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techniques:
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- html-export
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patterns:
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- iteration-over-groups
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dataprep: []
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styling: []

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