feat(d3): implement quiver-basic

[github-actions]

Implementation: quiver-basic - javascript/d3

Implements the javascript/d3 version of quiver-basic.

File: plots/quiver-basic/implementations/javascript/d3.js

Parent Issue: #1014

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🤖 impl-generate workflow

[claude]

AI Review - Attempt 1/3

Image Description

Light render (plot-light.png): Warm off-white (~#FAF8F1) background. Bold dark-ink title "quiver-basic · javascript · d3 · anyplot.ai" centered at top. Dark axis labels "Distance east of eddy core (km)" / "Distance north of eddy core (km)" with legible tick labels -3..3. Subtle light-gray gridlines. A 15x15 grid of arrows forms a clear circular rotation (vortex) pattern around the origin, colored from Imprint green (low magnitude) to blue (higher magnitude) via the imprint_seq scale, with a labeled gradient legend ("Current speed", 0–1.1 cm/s) top-right. All text is readable against the light background.

Dark render (plot-dark.png): Warm near-black (~#1A1A17) background. Same title, axis labels, and tick labels now rendered in light ink — clearly legible, no dark-on-dark issues anywhere (title, axis labels, ticks, legend text all confirmed light-colored on the dark surface). Gridlines remain subtly visible. Arrow colors are identical to the light render — only chrome (background, text, grid) flips, confirming correct theme-adaptive implementation. All text is readable against the dark background.

Both renders pass legibility.

Score: 87/100

Category	Score	Max
Visual Quality	28	30
Design Excellence	13	20
Spec Compliance	15	15
Data Quality	14	15
Code Quality	10	10
Library Mastery	7	10
Total	87	100

Visual Quality (28/30)

• VQ-01: Text Legibility (7/8)
• VQ-02: No Overlap (6/6)
• VQ-03: Element Visibility (5/6)
• 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 (13/20)

• DE-01: Aesthetic Sophistication (5/8) - Physically motivated vortex + magnitude coloring show real thought, but overall treatment is fairly standard
• DE-02: Visual Refinement (4/6) - Subtle grid and generous margins; axis domain lines/grid could be lighter
• DE-03: Data Storytelling (4/6) - Rotation reads clearly via direction + color, no extra guide emphasizing the core

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 (7/10)

• LM-01: Idiomatic Usage (4/5)
• LM-02: Distinctive Features (3/5) - Custom arrowhead trigonometry and cell-density-aware length scaling

Score Caps Applied

• None

Strengths

• Physically motivated rotating-eddy vortex (u = -y·decay, v = x·decay with Gaussian decay from the core) produces a visually compelling, oceanographically plausible flow field
• Arrow color correctly encodes current magnitude using the Imprint sequential palette (imprint_seq), identical between light and dark renders
• Square orientation correctly forced via equal x/y pixel scale so vector angles render undistorted
• Arrow length auto-scaled to ~85% of grid cell size, keeping arrows clearly visible without overlap across the 15x15 grid
• Clean gridlines, unit-bearing axis labels, and a labeled magnitude legend with matching gradient stops

Weaknesses

• Near-core arrows (lowest magnitude) are very short and pale, making direction hard to read at a glance — consider a small minimum arrow length so low-magnitude vectors stay legible
• Aesthetic treatment is competent but fairly standard for a D3 vector field — subtler axis domain lines / thinner grid would push Design Excellence further
• Data storytelling relies entirely on color + arrow density to reveal the rotation; a light annotation or radial guide at the eddy core could make the pattern even more immediately legible

Issues Found

1. DE-01 MODERATE: Aesthetic treatment is solid but not exceptional — standard axis chrome and legend construction
   • Fix: Consider lighter/thinner axis domain lines, a more refined legend treatment, or subtle emphasis at the vortex core
2. VQ-03 MINOR: Lowest-magnitude arrows near the eddy core are faint and short
   • Fix: Apply a small minimum arrow length/opacity floor so near-zero vectors remain visible

AI Feedback for Next Attempt

This is a strong, physically grounded implementation — keep the vortex data generation, magnitude-based coloring, and square-aspect correctness. To push higher: give near-zero-magnitude arrows a minimum visible length/opacity, and consider lighter axis chrome (thinner domain line, softer grid) for more visual refinement.

Verdict: APPROVED

[github-actions]

🔧 Repair Attempt 1/4

Applied fixes based on AI review feedback.

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

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🤖 impl-repair

[claude]

AI Review - Attempt 2/3

Image Description

Light render (plot-light.png): Warm off-white (#FAF8F1) background. Bold dark-ink title "quiver-basic · javascript · d3 · anyplot.ai" centered at top. Dark axis labels "Distance east of eddy core (km)" / "Distance north of eddy core (km)" with legible tick labels -3..3 on both axes. A 15x15 grid of arrows forms a clear counterclockwise vortex pattern around the origin, colored from Imprint brand green (low magnitude) to Imprint blue (higher magnitude) via the imprint_seq scale, with a labeled gradient legend ("Current speed", 0–1.1 cm/s) top-right. A new dashed radial guide circle marks the eddy core's decay radius, and near-zero vectors now get a minimum shaft length so direction stays legible near the stagnation point. All text is readable against the light background; no clipping found at any edge on close inspection.

Dark render (plot-dark.png): Warm near-black (#1A1A17) background. Same title, axis labels, and tick labels now rendered in light ink — clearly legible, no dark-on-dark issues anywhere (title, axis labels, ticks, legend text all confirmed light-colored on the dark surface). Gridlines and the core-radius guide remain subtly visible. Arrow colors, positions, and the gradient legend are pixel-identical to the light render — only chrome (background, text, grid) flips, confirming correct theme-adaptive implementation. All text is readable against the dark background.

Both renders pass legibility.

Score: 92/100

Category	Score	Max
Visual Quality	30	30
Design Excellence	15	20
Spec Compliance	15	15
Data Quality	15	15
Code Quality	10	10
Library Mastery	7	10
Total	92	100

Visual Quality (30/30)

• 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 (4/4)
• VQ-06: Axis Labels & Title (2/2)
• VQ-07: Palette Compliance (2/2)

Design Excellence (15/20)

• DE-01: Aesthetic Sophistication (5/8) - Physically motivated color-coded vortex shows real thought, but overall chrome/legend treatment remains fairly standard
• DE-02: Visual Refinement (5/6) - Axis domain lines lightened per prior feedback (stroke-width 0.75, opacity 0.5), subtle grid, generous margins
• DE-03: Data Storytelling (5/6) - New dashed radial guide circle at the core decay radius plus magnitude coloring gives a clear, immediate read of the vortex structure

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 (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 (7/10)

• LM-01: Idiomatic Usage (4/5)
• LM-02: Distinctive Features (3/5) - Manual arrowhead trigonometry and cell-density-aware length scaling are D3-specific, but not fully exploiting further distinctive capabilities

Score Caps Applied

• None

Strengths

• Physically motivated rotating-eddy vortex (u = -y·decay, v = x·decay with Gaussian decay from the core) reads clearly as counterclockwise rotation with speed peaking mid-radius
• Attempt-1 weaknesses fully addressed: minimum shaft length for near-core arrows, a dashed radial guide circle at the eddy core's decay radius, and lightened axis domain lines
• Arrow color correctly encodes current magnitude with the Imprint sequential palette (imprint_seq, green→blue), identical between light and dark renders
• Square orientation correctly forced via equal x/y pixel scale so vector angles render undistorted
• 225-arrow 15x15 grid with no overlap or crowding, confirmed at the core, canvas edges, and corners
• Clean, deterministic, KISS-structured code with correct mount-node contract and no fake interactivity

Weaknesses

• Magnitude is non-monotonic with radius (peaks around r≈1.73km, decays both toward the core and the domain edge), so the outer ring reads as "weak" the same way the core does — a subtle nuance that could confuse a casual viewer without extra context
• Title occupies roughly 40-45% of the square canvas width — legible and unclipped, but there is headroom to grow it slightly for a stronger visual anchor

Issues Found

None blocking — both items above are minor polish suggestions for a future pass, not required fixes.

AI Feedback for Next Attempt

Not applicable — this attempt is approved. If revisited in the future: consider a small annotation or two-sided legend cue clarifying that speed decreases both toward the core and toward the far field (not monotonically outward), and there is headroom to grow the title slightly for more visual presence.

Verdict: APPROVED