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- Correct rose/Nightingale chart with 12 equal-angle wedge segments and radius proportional
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to value
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- Viridis continuous colormap applied to value:Q is appropriate and perceptually
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uniform, creating effective dual encoding (radius + color) for the rainfall data
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- Radial gridlines at 25/50/75/100 mm with unit labels ('75 mm', '100 mm') aid value
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estimation as required by spec
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- All font sizes explicitly set and appropriate for the 3600x3600 canvas (title
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32px, month labels 22px, value labels 20px, grid labels 18px)
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- 'Full theme-adaptive chrome: PAGE_BG, INK, INK_SOFT tokens used correctly; both
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light (#FAF8F1) and dark (#1A1A17) backgrounds render correctly'
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- Layer composition with alt.layer() combining gridlines + arcs + value labels +
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month labels demonstrates idiomatic Altair usage
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- Both PNG and HTML saved per Altair interactive library requirements
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- 'Title format correct: ''rose-basic · altair · anyplot.ai'''
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- Data is deterministic (hardcoded monthly rainfall array), no seed needed
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- KISS code structure with no functions or classes
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- Viridis colormap is semantically correct for continuous value-based color encoding,
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providing intuitive low-to-high visual hierarchy
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- Segment stroke using PAGE_BG creates clean visual separation that adapts correctly
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to both light and dark themes
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- Five-layer Altair composition is clean and idiomatic — gridlines, labels, data
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each isolated
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- 'Full theme-adaptive chrome: all INK/INK_SOFT/PAGE_BG tokens properly threaded
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throughout'
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- 'Output format correct: both PNG and HTML exported for both themes'
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weaknesses:
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- 'Design Excellence gap (13/20): viridis colormap is effective but the overall
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layout lacks visual polish — consider adding a subtle center dot, refining gridline
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labels with an elevated background box, or adding a concise subtitle with the
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scenario (''Monthly Rainfall, mm'')'
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- 'DE-03 Data Storytelling: the dual encoding (radius + viridis) is good but could
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be stronger — consider annotating the peak month (Nov: 92mm) and trough (Jul:
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22mm) with callout labels or brief annotation text to direct the viewer''s attention
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to the story'
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- 'DE-02 Visual Refinement: the circular gridlines use strokeOpacity=0.35 and strokeDash=[6,4]
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which is appropriate, but the overall chrome could be more refined — the plain
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title with no subtitle and the sparse grid label positioning at 3 o''clock feels
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unfinished'
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- 'LM-02 Distinctive Features: while layer-composition and mark_arc with theta2
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are Altair-specific, the implementation could leverage Altair''s selection or
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a more distinctive Vega-Lite feature (e.g., a center circle mark, a custom radial
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label layout technique) to differentiate it further from a generic polar chart'
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- 'VQ-02 minor label crowding: value labels for June (28), July (22), August (30)
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cluster near center due to small segment radii; the label placement formula `max(v
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* 1.35, 45)` places them all at similar radii which creates a tight cluster at
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bottom'
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- Rose chart is positioned in the upper half of the 1200x1200 canvas, leaving excessive
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empty space below; center of chart area should be better utilized
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- No data storytelling element (e.g. highlighting peak month, focal annotation)
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— the chart shows data but does not guide the viewer to the key insight
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- Value labels for low-rainfall months (Jun=28, Jul=22, Aug=30) are crowded near
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the center; minimum offset or different placement needed for very small segments
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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 "rose-basic · altair · anyplot.ai" at top center in dark ink, clearly readable. Month labels (Jan–Dec) in bold dark text around the outer ring, readable. Value labels (22–92) near segment tips in bold dark text, readable. Grid labels "75 mm" and "100 mm" at 3 o'clock position in muted INK_SOFT, small but legible. Dashed circular gridlines at 25/50/75/100 mm in subtle gray.
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Data: 12 arc segments colored with viridis palette (purple/dark-blue for low values Jun=28, Jul=22; transitioning to teal, green, yellow-green, yellow for high values Nov=92, Dec=88, Oct=85). Segment radii visibly proportional to rainfall values. Winter months (Oct–Jan) dominate with taller, brighter segments.
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Legibility verdict: PASS — all text readable against light background; no light-on-light issues.
Chrome: Title "rose-basic · altair · anyplot.ai" in dark #1A1A17 ink, bold and readable. Month labels (Jan–Dec) in dark INK around the outer edge. Value labels (22–92) in dark INK near segment tips. Grid labels "75 mm" and "100 mm" in INK_SOFT at 3 o'clock position — visible. "25 mm" and "50 mm" labels at very small radii are harder to distinguish but present.
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Data: 12 rose segments using viridis colormap — deep purple/indigo for low summer months (Jul=22mm minimum), transitioning through teal and green to bright yellow-greenfor peak autumn months (Nov=92mm maximum). Segment strokes in PAGE_BG create clean separation. Dashed radial gridlines at four intervals.
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Legibility verdict: PASS — all major text elements readable against light background
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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 in light text at top, readable. Month labels in light bold text around outer ring, readable. Value labels in light bold text near segment tips, readable. Grid labels "75 mm" and "100 mm" in muted light-gray (INK_SOFT dark token), readable. Dashed circular gridlines visible against dark background.
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Data: Viridis segment colors appear identical to the light render — same purple-to-yellow gradient encoding rainfall values. No color shift between themes, data identity preserved.
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Legibility verdict: PASS — no dark-on-dark issues; all text uses light INK/INK_SOFT tokens appropriate for dark surface.
Chrome: Title text in light cream #F0EFE8, clearly readable. Month labels in light text. Value labels in light INK. Grid labels in INK_SOFT (#B8B7B0) — readable. No dark-on-dark failures detected.
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Data: Viridis colors are identical to light render — purple for low months, yellow-green for high months. Segment strokes use #1A1A17 (dark PAGE_BG) providing appropriate separation on dark surface.
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Legibility verdict: PASS — all text readable against dark background, no theme-adaptation failures
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criteria_checklist:
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visual_quality:
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score: 26
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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: 7
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max: 8
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passed: true
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comment: 'All font sizes explicitly set: title 32px, month labels 22px, value
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labels 20px, grid labels 18px. All readable at 3600x3600. Grid labels slightly
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small at 18px but within spec.'
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comment: 'Font sizes explicitly set (title=32, month=22, values=20, grid=18).
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All text readable in both themes. Minor: 25mm grid label at very small radius
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barely distinguishable.'
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- id: VQ-02
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name: No Overlap
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score: 5
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max: 6
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passed: true
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comment: Mostly no overlap; slight crowding of value labels for small segments
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(Jun=28, Jul=22, Aug=30) which cluster at similar radii near center.
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comment: Value labels for small summer segments (Jun=28, Jul=22, Aug=30) are
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clustered near center; slight crowding but no hard collision.
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- id: VQ-03
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name: Element Visibility
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score: 5
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score: 6
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max: 6
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passed: true
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comment: Segments clearly visible with viridis coloring. Small segments (Jun/Jul/Aug)
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are genuinely small due to low values, which is correct for a rose chart.
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comment: All 12 segments clearly visible with distinct stroke separation.
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Dashed radial gridlines readable at all rings.
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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: Viridis is perceptually uniform and CVD-safe. Good luminance progression.
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comment: Viridis is perceptually uniform and CVD-safe. No red-green sole signal.
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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: 'Chart fills ~60-70% of 3600x3600 canvas. Circular layout with gridlines
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is well-proportioned. Minor: data-heavy upper quadrant leaves lower portion
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visually sparse.'
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comment: 3600x3600px correct square format. Rose positioned correctly but
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sits in upper half leaving disproportionate empty space below.
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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: Grid labels include units ('75 mm', '100 mm'). Month labels descriptive.
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Title correct.
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comment: Title format correct. Grid labels provide scale context in mm units.
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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: 'Viridis applied to continuous value:Q is correct per style guide.
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Backgrounds are #FAF8F1 (light) and #1A1A17 (dark). All chrome uses theme-adaptive
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tokens. Both renders correct.'
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comment: 'Viridis correctly applied to continuous value-based color encoding.
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Backgrounds #FAF8F1 (light) and #1A1A17 (dark) correct.'
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design_excellence:
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score: 13
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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 default: viridis dual-encoding (radius + color) is a thoughtful
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design choice. White segment strokes add definition. Overall feels professional
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but not exceptional.'
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comment: Viridis creates meaningful visual hierarchy from low to peak months.
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Segment stroke with PAGE_BG creates clean separation. Professional but conventional
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composition.
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- id: DE-02
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name: Visual Refinement
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score: 4
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score: 3
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max: 6
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passed: true
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comment: 'Good refinement: dashed radial gridlines with low opacity, no axis
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chrome, configure_view strokeWidth=0. Could refine grid label positioning
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and add a subtitle.'
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comment: Dashed radial gridlines deliberate and appropriate. Axes/ticks suppressed
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correctly for circular chart. Moderate refinement beyond defaults.
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