feat(makie): implement area-stacked

[github-actions]

Implementation: area-stacked - julia/makie

Implements the julia/makie version of area-stacked.

File: plots/area-stacked/implementations/julia/makie.jl

Parent Issue: #2022

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🤖 impl-generate workflow

[claude]

AI Review - Attempt 1/3

Image Description

Light render (plot-light.png): Warm off-white background (#FAF8F1-consistent). Bold dark title "area-stacked · julia · makie · anyplot.ai" centered at top, "Revenue ($ thousands)" y-axis label and "Month" x-axis label in dark ink, soft-gray tick labels (y: 0/50/100/150; rotated x: Jan 2024…Oct 2025), and a frameless top-left legend (Electronics / Home Goods / Apparel / Sporting Goods). Four stacked bands run bottom-to-top: brand green (#009E73, largest), lavender (#C475FD), blue (#4467A3), ochre (#BD8233, smallest), each with a thin same-color boundary line, baseline pinned at zero. All text is clearly readable against the light background.

Dark render (plot-dark.png): Warm near-black background (#1A1A17-consistent), not pure black. Same title/labels now in light text, tick labels in a lighter soft gray, legend text light-colored — all fully readable against the dark surface, no dark-on-dark failures. The four band colors and boundary lines are pixel-identical to the light render, confirming only chrome (not data hue) flipped between themes.

Both paragraphs are required. A review that only describes one render is invalid.

Score: 85/100

Category	Score	Max
Visual Quality	29	30
Design Excellence	11	20
Spec Compliance	15	15
Data Quality	14	15
Code Quality	10	10
Library Mastery	6	10
Total	85	100

Visual Quality (29/30)

• VQ-01: Text Legibility (7/8)
• VQ-02: No Overlap (6/6)
• VQ-03: Element Visibility (6/6)
• VQ-04: Color Accessibility (2/2)
• VQ-05: Layout & Canvas (4/4)
• VQ-06: Axis Labels & Title (2/2)
• VQ-07: Palette Compliance (2/2)

Design Excellence (11/20)

• DE-01: Aesthetic Sophistication (5/8) - Competent theme-token handling and alpha-blended fills with boundary lines, but a conventional overall composition
• DE-02: Visual Refinement (4/6) - L-shaped spine, subtle single-axis grid, frameless legend
• DE-03: Data Storytelling (2/6) - Only the largest-at-bottom convention creates hierarchy; no annotation or emphasis on a specific insight

Spec Compliance (15/15)

• SC-01: Plot Type (5/5)
• SC-02: Required Features (4/4)
• SC-03: Data Mapping (3/3)
• SC-04: Title & Legend (3/3)

Data Quality (14/15)

• DQ-01: Feature Coverage (5/6)
• DQ-02: Realistic Context (5/5)
• DQ-03: Appropriate Scale (4/4)

Code Quality (10/10)

• CQ-01: KISS Structure (3/3)
• CQ-02: Reproducibility (2/2)
• CQ-03: Clean Imports (2/2)
• CQ-04: Code Elegance (2/2)
• CQ-05: Output & API (1/1)

Library Mastery (6/10)

• LM-01: Idiomatic Usage (4/5) - band! is the correct idiomatic Makie primitive for stacked area; proper Axis/theme-token config
• LM-02: Distinctive Features (2/5) - band!+lines! combo is a nice touch but stays close to a generic baseline technique

Score Caps Applied

• None

Strengths

• Imprint palette used in exact canonical order (positions 1-4: brand green, lavender, blue, ochre), identical data hues between light and dark renders — only chrome flips
• Theme-adaptive chrome (INK/INK_SOFT tokens) is threaded through title, axis labels, tick labels, spines, and grid; both renders are fully legible with no dark-on-dark or light-on-light failures
• Series correctly ordered largest-to-smallest bottom-to-top per the spec's guidance, and ylims!(ax, 0, nothing) forces a true zero baseline
• Clean visual refinement: L-shaped spine (top/right removed), subtle y-axis-only grid at 15% opacity, frameless legend
• band! fills combined with lines! boundary overlays give crisp, readable seams between the four stacked bands
• Canvas saved at exactly 3200x1800 (landscape gate passes) via the documented resolution=(1600,900)/px_per_unit=2 pattern

Weaknesses

• Title hierarchy is modest: titlesize=20 vs body text at 14 is only a ~1.4x ratio, so the title doesn't dominate as "the first thing readers see" — since the title text is short (41 chars, well under the 67-char benchmark) there's headroom to bump titlesize to ~24-26 without risking overflow
• No data-storytelling focal point beyond the size-ordering convention — nothing calls out the accelerating overall growth or the dominant Electronics contribution
• Boundary line width (linewidth=1.5) is on the thin side for four stacked bands; nudging to ~2 would sharpen the seams slightly, especially at mobile scale
• Library-mastery ceiling: relies on the standard band!+lines! combination without any Makie-distinctive touch (e.g. text! value callouts) that would elevate it beyond a competent baseline

Issues Found

1. DE-03 LOW: No visual hierarchy beyond the fixed size-ordering
   • Fix: Consider a subtle end-of-line value label or emphasis on the total/Electronics series to give the chart a clearer focal point
2. LM-02 LOW: Generic technique combination
   • Fix: Layer in a Makie-distinctive touch (e.g. text! end-labels) to differentiate from a baseline stacked-area implementation

AI Feedback for Next Attempt

Strong, spec-compliant implementation — keep the palette/theme handling as-is. To raise the score further: strengthen title hierarchy (titlesize ~24-26), add a data-storytelling focal point (e.g. end-of-line labels or emphasis on the dominant series), and consider a Makie-distinctive flourish for library mastery.

Verdict: APPROVED

[github-actions]

🔧 Repair Attempt 1/4

Applied fixes based on AI review feedback.

Status: Repair completed, re-triggering review...

---

🤖 impl-repair

[claude]

AI Review - Attempt 2/3

Image Description

Light render (plot-light.png): Warm off-white background (#FAF8F1-consistent). Bold dark title "area-stacked · julia · makie · anyplot.ai" centered at top (now clearly larger than body text, ~1.8x ratio), "Revenue ($ thousands)" y-axis label and "Month" x-axis label in dark ink, soft-gray tick labels, frameless top-left legend (Electronics / Home Goods / Apparel / Sporting Goods) — all readable against the light background. Four stacked bands run bottom-to-top: brand green (largest), lavender, blue, ochre (smallest), zero baseline. However, the Electronics (green) band shows a clearly visible set of ~20 faint diagonal hairline streaks running through the entire fill — a rendering artifact from the new per-vertex alpha-gradient fill, not the intended smooth left-to-right ramp.

Dark render (plot-dark.png): Warm near-black background (#1A1A17-consistent), not pure black. Same title/labels now in light text, all fully readable, no dark-on-dark failures. Data band colors and boundary lines are pixel-identical to the light render — only chrome flipped. The same diagonal hairline streaking artifact is present in the Electronics band here too, confirming the defect is theme-independent (it comes from the fill technique, not a theme-token bug).

Both paragraphs confirm the theme-readability checklist passes (backgrounds, text legibility), but both also confirm a new visual defect introduced in this attempt.

Score: 79/100

Category	Score	Max
Visual Quality	27	30
Design Excellence	8	20
Spec Compliance	15	15
Data Quality	14	15
Code Quality	9	10
Library Mastery	6	10
Total	79	100

Visual Quality (27/30)

• VQ-01: Text Legibility (7/8) - All text readable in both themes; title hierarchy now clear
• VQ-02: No Overlap (6/6)
• VQ-03: Element Visibility (4/6) - Gradient artifact on Electronics band introduces spurious diagonal streaks competing with real boundary lines
• VQ-04: Color Accessibility (2/2)
• VQ-05: Layout & Canvas (4/4) - Canvas exactly 3200x1800
• VQ-06: Axis Labels & Title (2/2)
• VQ-07: Palette Compliance (2/2)

Design Excellence (8/20)

• DE-01: Aesthetic Sophistication (3/8) - Per-vertex gradient fill on Electronics band renders as visible diagonal seam artifacts, reading as a rendering bug rather than polish
• DE-02: Visual Refinement (3/6) - Clean spines/grid, but the streaking artifact inside the primary data mark spoils overall refinement
• DE-03: Data Storytelling (2/6) - Gradient was meant to create a focal point but is imperceptible as an intensity ramp at this scale; only the artifact seams are visible, so attempt 1's storytelling feedback is still unaddressed

Spec Compliance (15/15)

• SC-01: Plot Type (5/5)
• SC-02: Required Features (4/4)
• SC-03: Data Mapping (3/3)
• SC-04: Title & Legend (3/3)

Data Quality (14/15)

• DQ-01: Feature Coverage (5/6)
• DQ-02: Realistic Context (5/5)
• DQ-03: Appropriate Scale (4/4)

Code Quality (9/10)

• CQ-01: KISS Structure (3/3)
• CQ-02: Reproducibility (2/2)
• CQ-03: Clean Imports (2/2)
• CQ-04: Code Elegance (1/2) - The per-vertex alpha list comprehension adds complexity that produces a visible fill artifact rather than the intended effect
• CQ-05: Output & API (1/1)

Library Mastery (6/10)

• LM-01: Idiomatic Usage (4/5)
• LM-02: Distinctive Features (2/5) - Per-vertex color vector on band! is a genuine Makie-specific capability, but the executed result is a visible artifact rather than a working distinctive flourish

Score Caps Applied

• None

Strengths

• Title hierarchy fixed from attempt 1: titlesize=25 vs body 14 (~1.8x) now reads clearly as the dominant element without overflowing the canvas
• Imprint palette used in exact canonical order (positions 1-4), identical data hues between light and dark renders — only chrome flips
• Theme-adaptive chrome (INK/INK_SOFT tokens) threaded through title, axis labels, tick labels, spines, and grid; both renders fully legible, no dark-on-dark/light-on-light failures
• Series correctly ordered largest-to-smallest bottom-to-top, and ylims!(ax, 0, nothing) forces a true zero baseline
• Clean visual refinement: L-shaped spine, subtle y-axis-only grid, frameless legend
• Canvas saved at exactly 3200x1800 (landscape gate passes)

Weaknesses

• REGRESSION: the new per-vertex-alpha gradient fill on the Electronics band (electronics_fill passed to band!) renders as a series of visible diagonal hairline seams across the ENTIRE band in both light and dark renders — not a smooth left-to-right intensity ramp. CairoMakie triangulates the band! polygon between each pair of the 24 monthly vertices and linearly interpolates color within each triangle, so every vertex boundary shows up as a faint diagonal stripe across the fill. This reads as a rendering glitch, not a design flourish.
• The gradient-fill attempt was intended to address attempt 1's data-storytelling feedback, but since it doesn't read as a perceptible ramp (only the artifact seams are visible), the storytelling goal is still unmet.
• The diagonal seam artifacts compete visually with the real lines! boundary strokes, making it harder to tell which lines are meaningful series boundaries vs. rendering noise.

Issues Found

1. DE-01/VQ-03 HIGH: Per-vertex alpha gradient on the Electronics band! produces visible diagonal seam artifacts in both themes
   • Fix: Revert the Electronics band to a flat (IMPRINT_PALETTE[1], 0.85) color, matching the other three bands and matching attempt 1 (which was clean). Drop the electronics_fill list comprehension entirely.
2. DE-03 MEDIUM: No working data-storytelling focal point
   • Fix: Pursue the focal point through a mechanism that doesn't fight CairoMakie's per-vertex triangulated color interpolation — e.g. a text! end-of-line value label on the Electronics series, or a subtle boundary-linewidth emphasis, rather than a per-vertex fill gradient.

AI Feedback for Next Attempt

Revert the Electronics band's per-vertex alpha gradient fill back to a flat color like the other three bands — it introduces clearly visible diagonal seam artifacts in both light and dark renders that look like a rendering bug, not a design flourish. This is a regression from attempt 1, which had a clean flat-color fill. To still address the data-storytelling gap flagged in attempt 1, use a different technique that doesn't rely on per-vertex color interpolation across the band polygon — e.g. a text! end-of-line value label on the Electronics series total, or a subtle stroke-weight emphasis on its boundary line. Everything else (palette, theme tokens, title hierarchy, legend, canvas) is solid — keep as-is.

Verdict: REJECTED

[github-actions]

🔧 Repair Attempt 2/4

Applied fixes based on AI review feedback.

Status: Repair completed, re-triggering review...

---

🤖 impl-repair

[claude]

AI Review - Attempt 3/3

Image Description

Light render (plot-light.png): Warm off-white background matching #FAF8F1. Bold dark title "area-stacked · julia · makie · anyplot.ai" top-center; top-left legend (no box frame) listing Electronics/Home Goods/Apparel/Sporting Goods; rotated date ticks on X ("Month"); "Revenue ($ thousands)" on Y with a subtle horizontal-only grid; top/right spines removed. Four stacked bands (green/lavender/blue/ochre, ~0.85 alpha, matching-color outlines) rise from a confirmed zero baseline. All chrome text is clearly readable against the light background. Two defects found on close (pixel-level) inspection: the bottom green (Electronics) band shows a diagonal hatching/seam artifact across its full width, and the right ~14% of the canvas — reserved by xlims!(ax, 0.5, 29) for an end-of-line "Electronics $Xk" annotation — is completely empty; no annotation or connector line renders anywhere.

Dark render (plot-dark.png): Same layout on a warm near-black #1A1A17 background. Chrome correctly flips to light ink (#F0EFE8 primary / #B8B7B0 secondary) — fully readable, no dark-on-dark failures. Data colors are pixel-identical to the light render (only chrome changed, as required). The same diagonal hatching artifact appears in the green band, and the same right-margin annotation is absent, confirmed via pixel scan of that region (no ink-colored pixels outside the axis/tick elements).

Both renders read cleanly overall; the two confirmed defects are the non-rendering annotation and the green-band hatching artifact, not a legibility problem.

Score: 87/100

Category	Score	Max
Visual Quality	28	30
Design Excellence	12	20
Spec Compliance	15	15
Data Quality	15	15
Code Quality	9	10
Library Mastery	8	10
Total	87	100

Visual Quality (28/30)

• VQ-01: Text Legibility (8/8)
• VQ-02: No Overlap (6/6)
• VQ-03: Element Visibility (6/6)
• VQ-04: Color Accessibility (2/2)
• VQ-05: Layout & Canvas (2/4) - ~14% of canvas is dead whitespace reserved for an annotation that never renders
• VQ-06: Axis Labels & Title (2/2)
• VQ-07: Palette Compliance (2/2)

Design Excellence (12/20)

• DE-01: Aesthetic Sophistication (6/8) - Intentional palette + typography hierarchy, short of publication-ready
• DE-02: Visual Refinement (4/6) - Diagonal hatching artifact in the Electronics band + unused margin
• DE-03: Data Storytelling (2/6) - The only intended focal-point annotation does not render in either theme

Spec Compliance (15/15)

• SC-01: Plot Type (5/5)
• SC-02: Required Features (4/4)
• SC-03: Data Mapping (3/3)
• SC-04: Title & Legend (3/3)

Data Quality (15/15)

• DQ-01: Feature Coverage (6/6)
• DQ-02: Realistic Context (5/5)
• DQ-03: Appropriate Scale (4/4)

Code Quality (9/10)

• CQ-01: KISS Structure (3/3)
• CQ-02: Reproducibility (2/2)
• CQ-03: Clean Imports (2/2)
• CQ-04: Code Elegance (1/2) - The annotation lines!/text! block is dead code; it runs but produces no visible output
• CQ-05: Output & API (1/1)

Library Mastery (8/10)

• LM-01: Idiomatic Usage (5/5)
• LM-02: Distinctive Features (3/5) - Manual PolyElement legend is a real Makie-specific technique, but the core band! stacking is replicable elsewhere

Score Caps Applied

• None

Strengths

• Palette compliance is perfect: first series is exactly #009E73, remaining 3 series follow Imprint canonical order (#C475FD, #4467A3, #BD8233), identical across both themes.
• Theme-adaptive chrome is fully correct in both renders — no dark-on-dark or light-on-light failures.
• True stacked-area construction (band! + lines!) with a correct zero baseline, largest-series-at-bottom ordering, and an idiomatic manually-built PolyElement legend matching the band alpha.
• Realistic, neutral retail-revenue dataset with plausible per-category growth trajectories and month-to-month noise.

Weaknesses

• The "Electronics $Xk" end-of-line annotation and its connector line (lines!/text!, added after xlims!(ax, 0.5, 29)) render as nothing in both plot-light.png and plot-dark.png — verified by pixel-level inspection of the right margin (x=3020–3200 of the 3200×1800 canvas): zero ink-colored or ink-soft-colored pixels exist there outside the axis line/tick labels. This leaves ~14% of canvas width as dead whitespace and forfeits the chart's only data-storytelling element.
• The Electronics (bottom, green) band shows a visible diagonal hatching/seam pattern across its entire width in both themes, absent from the other three bands — looks like a CairoMakie band! triangulation seam exposed by the semi-transparent (alpha=0.85) fill against a flat zero baseline.
• Title occupies only ~28% of canvas width (pixel-measured), narrower than the ~50–70% guideline for a title this length — still legible, but there's headroom to grow titlesize.

Issues Found

1. DE-03 LOW (2/6): Intended data-storytelling annotation doesn't render in either theme.
   • Fix: Either debug why text!/lines! added after xlims!(ax, 0.5, 29) produce no visible output (check axis clip rect / call ordering), or replace with a technique verified to render locally before committing (e.g., direct labels on all 4 series, or a simpler in-bounds annotation).
2. VQ-05 (2/4): ~14% of canvas is dead whitespace reserved for the non-rendering annotation.
   • Fix: Once the annotation is fixed or removed, tighten xlims!(ax, 0.5, 25) to reclaim that space for the data.
3. CQ-04 (1/2): Annotation code is non-functional/dead — compiles and runs but produces no visible output, and its own comment describes behavior that doesn't occur.
   • Fix: Same as above — make it work or remove it.
4. DE-02 (4/6): Diagonal hatching artifact in the Electronics band fill.
   • Fix: Try alpha=1.0 on that band, render with poly! instead of band!, or otherwise confirm the seam is gone via a local render before committing.

AI Feedback for Next Attempt

Verify the end-of-line annotation actually renders locally before committing — a broken text!/lines! call after xlims! leaves ~14% of the canvas as dead whitespace and forfeits all data-storytelling credit. Separately, inspect the Electronics band fill for the diagonal CairoMakie triangulation seam (try alpha=1.0 or switch to poly!), and consider growing the title a few points to better fill the header.

Verdict: APPROVED