feat(ggplot2): implement quiver-basic

[github-actions]

Implementation: quiver-basic - r/ggplot2

Implements the r/ggplot2 version of quiver-basic.

File: plots/quiver-basic/implementations/r/ggplot2.R

Parent Issue: #1014

---

🤖 impl-generate workflow

[claude]

AI Review - Attempt 1/3

Image Description

Light render (plot-light.png): Warm off-white background (#FAF8F1-class). Title "Cyclonic Wind Field · quiver-basic · r · ggplot2 · anyplot.ai" in dark ink, comfortably sized and fully within the canvas. X-axis label "Distance east of eye (km)" and y-axis label "Distance north of eye (km)" in dark ink, similarly sized; tick labels in softer gray. A 17x10 grid of 170 arrows forms a clear rotational (cyclonic) pattern circling a calm "eye" near the origin, colored from brand green (slow, near the eye) to blue (fast, outer ring) via the imprint_seq gradient, with a labeled colorbar legend ("Wind speed (m/s)") in a subtly elevated box. All text is clearly readable against the light background — no light-on-light issues.

Dark render (plot-dark.png): Warm near-black background (#1A1A17-class). Same title, axis labels, and tick labels now rendered in light ink/soft light gray — fully legible against the dark background, no dark-on-dark failures. Legend uses a barely-lighter dark elevated fill with light text, also legible. Arrow positions and the green-to-blue color gradient are identical to the light render — only chrome flipped, confirming data-color consistency across themes. All text reads clearly; no black-on-black issues detected.

Both paragraphs confirmed: all text passes legibility in both themes.

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	7	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) - Redundant length+color magnitude encoding and thoughtful radial-decay data generation, above generic defaults
• DE-02: Visual Refinement (3/6) - Clean minimal chrome (no spines/grid), generous margins, but not much beyond that
• DE-03: Data Storytelling (3/6) - Calm eye vs. fast outer ring gives a visible focal point, but no further hierarchy device (e.g. an eye marker/annotation)

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 (6/6)
• DQ-02: Realistic Context (5/5)
• DQ-03: Appropriate Scale (3/4) - Speeds (~0.5-2.8 m/s) read as light-breeze strength, not cyclone-force despite the "Cyclonic" framing

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 (5/5)
• LM-02: Distinctive Features (2/5) - Correct baseline geom_segment+arrow() approach with coord_fixed, but no further library-distinctive technique

Score Caps Applied

• None

Strengths

• Correct grammar-of-graphics approach for a quiver plot: geom_segment() + arrow(type = "closed") with coord_fixed(ratio = 1) so directions aren't visually distorted
• Direction AND magnitude are doubly encoded — arrow length (scaled to ~80% of grid spacing) and color (imprint_seq gradient) both track speed, producing a clear "calm eye vs. fast ring" focal point
• 170-arrow 17x10 grid sits squarely in the spec's recommended range (100-400 arrows, 10x10-20x20), uniformly spaced with no overlap
• Theme-adaptive chrome correctly threaded through title/axis/tick/legend colors and both backgrounds for light and dark renders
• Continuous scale correctly uses imprint_seq stops (#009E73 → #4467A3) with a proper colorbar legend labeled with units (m/s)
• Title format matches the mandated pattern exactly
• Clean, reproducible script: set.seed(42), only used imports, no functions/classes, correct ragg::agg_png save at the landscape canvas size

Weaknesses

• Wind speeds top out around ~2.8 m/s (legend max 2.5+) — light-breeze strength, not cyclone-force (real cyclonic winds start well above 17 m/s). Either rename to something less storm-specific (e.g. "Rotational Flow Field") or scale the speed values up so they read as genuinely cyclonic.
• No grid/axis border is a valid minimal look, but with 170 arrows spanning the canvas a very faint reference grid would aid reading exact positions — optional polish, not a defect.
• Design excellence is solid but not exceptional: beyond the color+length redundant encoding there's no further hierarchy device (e.g. an annotated eye marker) to make the "calm eye" story pop even more.

Issues Found

1. DQ-03 MINOR: "Cyclonic Wind Field" title paired with sub-3 m/s wind speeds is a domain-plausibility mismatch
   • Fix: Either scale speeds into a range that reads as storm-force, or soften the title/description to a generic rotational flow framing
2. DE-03 LOW: Focal point exists (calm eye) but isn't reinforced with an explicit annotation/marker
   • Fix: Optional — a small annotation or subtle marker at the eye could sharpen the storytelling further

AI Feedback for Next Attempt

This is a strong, spec-compliant implementation — keep the redundant length+color magnitude encoding, the correct coord_fixed usage, and the theme-adaptive chrome. If iterating further, consider nudging the wind-speed values into a range that better matches the "cyclonic" framing (or rename the scenario), and consider a small annotation at the eye to sharpen the visual storytelling.

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 (#FAF8F1-class) background. Title "Cyclonic Wind Field · quiver-basic · r · ggplot2 · anyplot.ai" spans 60% of plot width in dark ink; axis labels "Distance east of eye (km)" / "Distance north of eye (km)" in dark ink, tick labels in softer gray — all clearly legible. A new faint dotted major grid is visible on both axes without competing with the data. Legend "Wind speed (m/s)" shows a vertical color-bar (ticks 10–30) in a subtly elevated off-white box. 170 arrows on a 17×10 grid form a clear cyclonic rotation around a calm eye, now marked with an open dark-ink circle + italic "eye" label, plus a dashed eyewall guide ring at the radius of peak tangential speed. Arrow color runs brand green (#009E73, slow) → blue (#4467A3, fast, ~30-34 m/s) via the imprint_seq gradient — genuinely cyclone-force now, not light-breeze. Close-up crop around the eye marker confirms no overlap between circle, label, ring, and nearby arrows. All text readable — PASS.

Dark render (plot-dark.png): Warm near-black (#1A1A17-class) background. Same title, axis labels, tick labels, and dotted grid now in light ink/soft gray — fully legible, no dark-on-dark issues. Legend box uses a barely-lighter dark elevated fill with light text. Same green-to-blue gradient, arrow geometry, eye marker, and eyewall ring as the light render — data colors and annotation geometry are identical, confirming only chrome flipped. Close-up crop confirms no overlap here either. Brand green stays clearly visible near the eye. All text readable — PASS.

Both paragraphs required and both renders visually inspected, including a zoomed crop around the eye marker on each theme.

Score: 92/100

Category	Score	Max
Visual Quality	29	30
Design Excellence	15	20
Spec Compliance	15	15
Data Quality	15	15
Code Quality	10	10
Library Mastery	8	10
Total	92	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 (15/20)

• DE-01: Aesthetic Sophistication (6/8) - Redundant length+color encoding plus the new eyewall guide ring and eye annotation
• DE-02: Visual Refinement (4/6) - New faint dotted reference grid aids readability without clutter
• DE-03: Data Storytelling (5/6) - Eye marker + label + dashed eyewall ring give an explicit focal narrative device

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) - Speeds now ~5-34 m/s, peaking at genuine Category-1-hurricane strength, matching the "Cyclonic" title framing (prior light-breeze mismatch fixed)

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 (8/10)

• LM-01: Idiomatic Usage (5/5)
• LM-02: Distinctive Features (3/5) - Layering geom_path guide + dual annotate() calls shows more compositional skill than baseline, but no further library-distinctive technique

Score Caps Applied

• None

Strengths

• Wind speed range now genuinely cyclone-force (~5-34 m/s, peaking at Category 1 hurricane strength) instead of the previous light-breeze scale — fixes prior DQ-03 weakness
• New dashed eyewall guide ring + annotated "eye" marker give the plot a clear focal narrative device beyond color/length redundancy alone — fixes prior DE-03 weakness
• New faint dotted reference grid helps read exact arrow positions without competing with the data — fixes prior DE-02 weakness
• Correct grammar-of-graphics quiver approach: geom_segment() + arrow(type="closed") with coord_fixed(ratio = 1)
• Theme-adaptive chrome correctly threaded through title/axis/tick/legend/grid colors and both backgrounds
• Clean, reproducible, single-pass script: set.seed(42), only used imports, correct ragg::agg_png save at the exact 3200×1800 landscape canvas

Weaknesses

• Still no library-distinctive technique beyond the baseline geom_segment+arrow()+coord_fixed pattern for the core vector field itself — the guide ring and eye marker add storytelling but don't showcase a further ggplot2-specific quiver capability
• Aesthetic sophistication is strong but not exceptional — little further headroom remains without added complexity

Issues Found

1. LM-02 LOW: Core vector-field rendering technique is baseline (no library-distinctive quiver feature beyond geom_segment+arrow())
   • Fix: Optional polish only — e.g. varying arrowhead style by magnitude bucket, or a ggarrow/metR-style curved streamline overlay if available, is not required for approval

AI Feedback for Next Attempt

No further action required — this attempt resolved all three weaknesses flagged in attempt 1 (speed scale, storytelling focal point, reference grid). Remaining headroom is optional LM-02 polish only.

Verdict: APPROVED