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- 'Both renders are fully theme-adaptive with correct backgrounds (#FAF8F1 light
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/ #1A1A17 dark) and readable text in both themes'
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- All font sizes explicitly set (title=28px, subtitle=20px, node labels=20px bold,
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legend title=18px, legend labels=16px)
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- 'Correct title format: ''sankey-basic · altair · anyplot.ai'' with descriptive
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subtitle'
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- Interactive tooltips on nodes and HTML export alongside PNG — leverages Altair's
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interactive capabilities
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- Realistic energy flow domain (Coal/Gas/Nuclear/Renewable → Residential/Commercial/Industrial/Transport)
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with plausible values
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- Layer composition with alt.layer() is idiomatic Altair; detail encoding correctly
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groups flow polygons per source-target pair
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weaknesses:
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- 'Target node colors (#7EC8C8, #A8D8A8, #E8C07A, #C8A8E8) are custom hexes not
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in Okabe-Ito palette — use Okabe-Ito positions 5–7 (#E69F00, #56B4E9, #F0E442)
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and adaptive neutral for the 4 target nodes'
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- No visual emphasis or storytelling — the dominant flow (Coal→Industrial, value=45)
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is the single largest flow but receives no special treatment; no focal point guides
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the viewer
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- 'Node ordering creates maximum crossing: sorting source/target nodes to minimize
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crossings would improve readability'
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- Top-gap between subtitle and diagram is slightly large (top_margin=100 creates
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visible dead space under the subtitle text); compact layout would better utilize
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canvas
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- 'DE-03 is default (data displayed, no hierarchy): adding subtle emphasis to the
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largest flow or highlighting one key insight would elevate storytelling'
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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, not pure white.
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Chrome: Title "sankey-basic · altair · anyplot.ai" in bold dark text; subtitle "Energy Flow from Sources to Sectors" in dark-gray. All text clearly readable against the light background. Node labels (Renewable, Nuclear, Gas, Coal on left; Transport, Industrial, Commercial, Residential on right) are 20px bold dark text — fully readable.
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Data: Source nodes colored Okabe-Ito canonical order: Coal (#009E73 green-teal, bottom-left), Gas (#D55E00 orange, middle-left), Nuclear (#0072B2 blue, upper-middle-left), Renewable (#CC79A7 pink-purple, top-left). Flow bands inherit source colors with opacity=0.55. Target nodes use custom colors: Residential=teal, Commercial=light-green, Industrial=warm-tan, Transport=light-purple. Legend box (bottom-right) shows "Energy Source" with correct color swatches. Significant flow crossing visible in the center (X-pattern) — inherent to full mesh of 4 sources × 4 targets.
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Legibility verdict: PASS — all text dark on off-white, no contrast failures.
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Dark render (plot-dark.png):
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Background: Near-black (#1A1A17) — correct, not pure black.
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Chrome: Title and subtitle in light/white text — readable. Node labels in light (#F0EFE8) text — no dark-on-dark failures detected. Legend box has dark elevated background (#242420) with light-colored text.
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Data: Data colors are the same underlying hex values as light render (theme-constant). Due to opacity=0.55 alpha-blending on flow bands, colors appear visually darker/more saturated against the dark background (expected blending behavior). Node rectangles remain clearly visible with INK_SOFT borders. Flow crossing pattern identical to light render.
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Legibility verdict: PASS — all text is light on dark, no dark-on-dark failures.
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criteria_checklist:
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visual_quality:
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score: 27
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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: 8
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max: 8
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passed: true
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comment: 'All font sizes explicitly set: title=28px, subtitle=20px, node labels=20px
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bold, legend title=18px, legend labels=16px. Readable in both themes.'
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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: No overlapping text. Source and target labels positioned outside
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the crossing flow area. Legend well-placed.
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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 elements visible. Flow bands opacity=0.55 appropriate for crossing
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flows. Individual flow tracing is difficult due to the X-crossing pattern,
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but this is inherent to the full-mesh Sankey layout.
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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 source colors are CVD-safe. Flow bands distinguishable
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by hue + position.
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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: Diagram fills ~80% of canvas horizontally and ~75% vertically. Slight
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dead-space gap between subtitle and diagram start due to top_margin=100.
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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. Node names serve as labels. Subtitle describes
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the flow context. No traditional axes needed for Sankey.
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- id: VQ-07
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name: Palette Compliance
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score: 1
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max: 2
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passed: false
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comment: 'Source flow colors follow Okabe-Ito canonical order (Coal=#009E73,
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Gas=#D55E00, Nuclear=#0072B2, Renewable=#CC79A7). However, target node colors
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(#7EC8C8, #A8D8A8, #E8C07A, #C8A8E8) are custom hexes not in Okabe-Ito palette.
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Both backgrounds are theme-correct. Partial compliance.'
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design_excellence:
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score: 11
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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: 5
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max: 8
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passed: true
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comment: Above generic default — building a full Sankey from scratch in Altair
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demonstrates thoughtful implementation. Good color scheme for sources. Target
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node custom colors reduce coherence. Not publication-ready.
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- id: DE-02
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name: Visual Refinement
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score: 4
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max: 6
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passed: true
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comment: No grid lines (appropriate), no spines, smooth bezier curves, opacity-blended
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flows, node borders with INK_SOFT. Good refinement above defaults but top
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gap reduces polish.
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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: Data displayed correctly but no visual hierarchy or emphasis. The
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largest single flow (Coal→Industrial, value=45) is not highlighted. Crossing
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node order creates a maximally complex visual without guiding the viewer
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to any insight.
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spec_compliance:
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score: 15
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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: 5
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max: 5
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passed: true
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comment: Correct Sankey diagram with proportional flow band widths and smooth
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