feat(ggplot2): implement point-and-figure-basic

[github-actions]

Implementation: point-and-figure-basic - r/ggplot2

Implements the r/ggplot2 version of point-and-figure-basic.

File: plots/point-and-figure-basic/implementations/r/ggplot2.R

Parent Issue: #3755

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🤖 impl-generate workflow

[claude]

AI Review - Attempt 1/3

Image Description

Light render (plot-light.png): The chart renders on a warm off-white (#FAF8F1) background. The bold title "point-and-figure-basic · r · ggplot2 · anyplot.ai" appears at the top left in dark ink, occupying ~60% of the plot width. The Y-axis label "Price (USD)" and X-axis label "Column (Reversal #)" are both readable in dark ink. Tick labels are in a softer dark gray. The chart body shows X symbols in #009E73 (green/bullish) and O symbols in #D55E00 (orange/bearish), both rendered in bold monospace font. Major and minor grid lines are subtle. A bordered legend box on the right shows "O Bearish" and "X Bullish" with correctly colored glyphs. All text is clearly readable against the light background.

Dark render (plot-dark.png): The same chart on a warm near-black (#1A1A17) background. Title and axis labels render in light ink (#F0EFE8), clearly visible. Tick labels are in #B8B7B0 (INK_SOFT dark mode), legible. The legend box uses the dark elevated fill (#242420) with a subtle border. Data colors are identical to the light render — X symbols remain #009E73 and O symbols remain #D55E00; only the chrome flipped. Grid lines remain subtle against the dark surface. No dark-on-dark text failures observed.

Both renders pass legibility checks.

Score: 83/100

Category	Score	Max
Visual Quality	27	30
Design Excellence	12	20
Spec Compliance	13	15
Data Quality	14	15
Code Quality	9	10
Library Mastery	8	10
Total	83	100

Visual Quality (27/30)

• VQ-01: Text Legibility (7/8) — All font sizes explicitly set; both themes readable. Symbols at size=3.5mm may be marginally small at 400px mobile scale.
• VQ-02: No Overlap (6/6) — X/O symbols on discrete column/price grid, no collisions; legend does not overlap data.
• VQ-03: Element Visibility (5/6) — Clearly visible at full resolution; slightly small at mobile scale.
• VQ-04: Color Accessibility (2/2) — Okabe-Ito CVD-safe; X/O shapes provide secondary non-color distinction.
• VQ-05: Layout & Canvas (3/4) — Good proportions. Right portion (columns 7–9) is data-sparse, creating slight visual imbalance.
• VQ-06: Axis Labels & Title (2/2) — "Column (Reversal #)" and "Price (USD)" are descriptive with units.
• VQ-07: Palette Compliance (2/2) — X=#009E73 (Okabe-Ito Add workflow diagram for new prototype discovery #1), O=#D55E00 (Okabe-Ito Add Claude Code GitHub Workflow #2); backgrounds #FAF8F1/#1A1A17; both renders theme-correct.

Design Excellence (12/20)

• DE-01: Aesthetic Sophistication (5/8) — Above defaults: correct Okabe-Ito palette, monospace font for X/O is an elegant domain-appropriate choice, clean bordered legend. Not publication-ready — missing trend lines mean there is no visual focal point or emphasis beyond raw columns.
• DE-02: Visual Refinement (4/6) — L-shaped axes (no top/right spine), subtle major+minor grid, styled legend, generous whitespace. Good refinement.
• DE-03: Data Storytelling (3/6) — Column height variation shows bullish surge (col 3) and big bearish drop (col 4). Without 45° trend lines the key P&F insight — support and resistance levels — is invisible to the viewer.

Spec Compliance (13/15)

• SC-01: Plot Type (5/5) — Correct P&F chart with X columns for rising prices and O columns for falling prices.
• SC-02: Required Features (2/4) — Core P&F logic implemented (reversal algorithm, column structure, price scale). Missing: 45-degree support/resistance trend lines. Spec Notes explicitly require: "Draw support trend lines connecting ascending lows (45-degree up) and resistance trend lines connecting descending highs (45-degree down)."
• SC-03: Data Mapping (3/3) — Y-axis = price, X-axis = column number (not time). All data visible.
• SC-04: Title & Legend (3/3) — Title matches required format; legend shows "O Bearish" and "X Bullish" with correct colored symbols.

Data Quality (14/15)

• DQ-01: Feature Coverage (5/6) — Both X and O column types shown, multiple reversals, varying column heights. Missing trend line visualization as a P&F feature.
• DQ-02: Realistic Context (5/5) — "ACME Corp." fictional stock, neutral financial context, plausible multi-phase price movement.
• DQ-03: Appropriate Scale (4/4) — Starting at $52, range ~$43–73, box_size=$2, reversal=3. All sensible for a mid-cap stock P&F chart.

Code Quality (9/10)

• CQ-01: KISS Structure (2/3) — build_pf() helper function deviates from strict no-functions rule, but the P&F algorithm complexity justifies factoring it out.
• CQ-02: Reproducibility (2/2) — set.seed(42) at top of script.
• CQ-03: Clean Imports (2/2) — Only ggplot2 and ragg imported, both used.
• CQ-04: Code Elegance (2/2) — Clean R idioms, no fake UI, appropriate complexity for the chart type.
• CQ-05: Output & API (1/1) — sprintf("plot-%s.png", THEME) with ragg::agg_png. Correct.

Library Mastery (8/10)

• LM-01: Idiomatic Usage (5/5) — Expert ggplot2: geom_text with label aesthetic for symbol rendering, scale_color_manual with labels, guides() with override.aes, expansion(), proper theme_minimal layering.
• LM-02: Distinctive Features (3/5) — override.aes for custom legend glyphs is distinctively ggplot2; monospace family in geom_text; minor_breaks for dense Y grid. Above generic but not maximally distinctive.

Score Caps Applied

• None

Strengths

• Correct P&F algorithm with proper X/O column assignment and 3-box reversal logic
• Excellent idiomatic ggplot2: geom_text with label aesthetic is the canonical pattern for character-as-data; guides(override.aes) elegantly customizes legend glyphs
• Perfect theme adaptation — both light (#FAF8F1) and dark (#1A1A17) renders are fully readable with no chrome failures
• Monospace bold font for X/O symbols adds authentic P&F chart feel, fitting the domain
• Realistic neutral stock scenario with plausible multi-phase price movement

Weaknesses

• Missing 45-degree trend lines — spec Notes explicitly require drawing support lines (connecting ascending lows, 45° up) and resistance lines (connecting descending highs, 45° down) across the column grid. These are the primary analytical tool in P&F charts and their absence is both a spec compliance and storytelling gap.
• Right portion of chart (columns 7–9) is sparse, creating slight visual imbalance — consider extending price data or adjusting box/reversal parameters to generate more column activity.

Issues Found

1. SC-02 LOW (2/4): Missing 45-degree support/resistance trend lines
   • Fix: Compute ascending-low and descending-high anchor points across columns; draw diagonal geom_segment or geom_abline overlays in a neutral color (e.g., INK_SOFT) at 45-degree angles through the P&F grid.
2. DE-03 MEDIUM (3/6): Storytelling limited without trend lines
   • Fix: Adding the trend lines immediately creates a visual focal point that guides the viewer to the chart's key insight (support/resistance levels).

AI Feedback for Next Attempt

The core P&F algorithm and ggplot2 implementation are excellent. The single most impactful fix is adding 45-degree trend lines as required by the spec: draw at least one support line (connecting ascending column lows, slope = +box_size per column) and one resistance line (connecting descending column highs, slope = −box_size per column) using geom_segment in INK_SOFT color. These trend lines are the defining analytical feature of P&F charts and should run across the column grid from the identified anchor points. Optionally increase symbol size slightly (size=4.0) to improve mobile readability.

Verdict: REJECTED

[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): The plot renders on a warm off-white #FAF8F1 background. The title "point-and-figure-basic · r · ggplot2 · anyplot.ai" appears in bold dark text at the top left, clearly readable. The chart shows a point-and-figure chart with X symbols in green (#009E73) for bullish columns and O symbols in orange (#D55E00) for bearish columns, arranged across 9 columns on the X-axis ("Column (Reversal #)") and a price range of roughly $42–$74 on the Y-axis ("Price (USD)"). Dashed trend lines in matching green and orange extend from each column's base/top at 45-degree angles, showing support and resistance zones. The legend on the right shows "O Bearish" and "X Bullish" with an elevated-background bordered box. Axis labels, tick labels, and legend text are all clearly readable against the light background. No light-on-light issues observed. Legibility verdict: PASS.

Dark render (plot-dark.png): The same chart renders on a warm near-black #1A1A17 background. The title, axis labels ("Column (Reversal #)", "Price (USD)"), and tick labels are rendered in light text and are all clearly readable against the dark background. The data colors are identical to the light render: green (#009E73) for X/bullish and orange (#D55E00) for O/bearish symbols and their corresponding trend lines. The legend box uses the elevated dark background (#242420). Grid lines are subtle and don't compete with data. No dark-on-dark failures observed — all chrome elements correctly adapt to the dark theme. Legibility verdict: PASS.

Score: 87/100

Category	Score	Max
Visual Quality	28	30
Design Excellence	13	20
Spec Compliance	15	15
Data Quality	15	15
Code Quality	9	10
Library Mastery	7	10
Total	87	100

Visual Quality (28/30)

• VQ-01: Text Legibility (7/8) — All sizes explicitly set; all text readable in both themes; minor deduction for X/O symbols at size=3.5 ggplot units which may be slightly small at mobile scale
• VQ-02: No Overlap (6/6) — No text overlaps observed; X/O symbols well-spaced in their column grid positions
• VQ-03: Element Visibility (5/6) — X/O symbols clearly visible in both themes; trend lines appropriately subtle at alpha=0.45; many overlapping trend lines across columns reduce visual clarity slightly
• VQ-04: Color Accessibility (2/2) — Okabe-Ito palette with green/orange (CVD-safe); both symbol shape AND color distinguish bull/bear
• VQ-05: Layout & Canvas (4/4) — Good 16:9 proportions, legend well-placed on right without overlapping data, balanced margins
• VQ-06: Axis Labels & Title (2/2) — X: "Column (Reversal #)", Y: "Price (USD)" — both descriptive with context
• VQ-07: Palette Compliance (2/2) — First series #009E73 ✓; second series #D55E00 ✓; light bg #FAF8F1 ✓; dark bg #1A1A17 ✓; both themes chrome-correct

Design Excellence (13/20)

• DE-01: Aesthetic Sophistication (5/8) — Monospace bold font for X/O symbols is thematically appropriate for a financial chart; custom legend with override.aes; semi-transparent trend lines create good depth; elevated legend box; above default (4) but not exceptional
• DE-02: Visual Refinement (4/6) — Tick marks removed; top/right spines removed; subtle major grid (linewidth=0.15) and minor grid (linewidth=0.08); clean margins; minor grid adds slight visual busyness
• DE-03: Data Storytelling (4/6) — 45-degree trend lines communicate support/resistance narrative; color coding reinforces bullish/bearish story; column-based x-axis correctly emphasizes time-filtering; drawing lines from every column creates visual complexity that slightly dilutes clarity

Spec Compliance (15/15)

• SC-01: Plot Type (5/5) — Correct P&F chart with X/O symbols in column-based layout
• SC-02: Required Features (4/4) — X for rising, O for falling; green/orange color coding; single-type columns; 45-degree support and resistance trend lines; box-size-based grid intervals
• SC-03: Data Mapping (3/3) — X-axis = columns (reversals), not time; Y-axis = price in USD with box-size grid intervals
• SC-04: Title & Legend (3/3) — Title: "point-and-figure-basic · r · ggplot2 · anyplot.ai" ✓; Legend: "O Bearish" / "X Bullish" — appropriate labels

Data Quality (15/15)

• DQ-01: Feature Coverage (6/6) — Multiple X and O columns; reversals present; both support and resistance trend lines; realistic price progression with trend changes
• DQ-02: Realistic Context (5/5) — ACME Corp. stock simulation; 300 trading days; realistic price range; neutral financial context
• DQ-03: Appropriate Scale (4/4) — $52 starting price; $2 box size; 3-box reversal (standard); realistic $42–$74 price range

Code Quality (9/10)

• CQ-01: KISS Structure (2/3) — Two helper functions (floor_box, build_pf) defined; technically violates no-functions criterion though complexity justifies build_pf
• CQ-02: Reproducibility (2/2) — set.seed(42) ✓
• CQ-03: Clean Imports (2/2) — Only ggplot2 and ragg, both used
• CQ-04: Code Elegance (2/2) — Clean, well-structured R code; no fake UI; appropriate complexity for chart type
• CQ-05: Output & API (1/1) — plot-{THEME}.png via ragg::agg_png; modern ggplot2 3.5.1 API with linewidth=

Library Mastery (7/10)

• LM-01: Idiomatic Usage (4/5) — Proper grammar of graphics layering; guides(override.aes=) for legend customization; expansion(0) for axis limits; correct theme layering pattern
• LM-02: Distinctive Features (3/5) — guides(override.aes=) is distinctively ggplot2; creative use of geom_text for P&F symbols; expansion() for axis control; multiple scale functions correctly composed

Score Caps Applied

• None

Strengths

• Excellent two-theme implementation with all chrome tokens correctly applied (PAGE_BG, INK, INK_SOFT, ELEVATED_BG)
• Correct Okabe-Ito palette: green (#009E73) for bullish, orange (#D55E00) for bearish — CVD-safe with shape+color redundancy
• Complete P&F algorithm with proper box_size, reversal, and column switching logic
• Monospace bold font for X/O symbols is thematically appropriate for a financial chart
• Custom legend with override.aes correctly shows X/O symbols in the legend box
• Both 45-degree support (from X column lows) and resistance (from O column tops) trend lines implemented

Weaknesses

• Helper functions (floor_box, build_pf) technically violate the KISS no-functions criterion
• Drawing trend lines from EVERY X/O column creates many crisscrossing lines; the spec suggests connecting ascending lows selectively, which would produce a cleaner chart
• Both major and minor grid lines active simultaneously adds subtle visual busyness; minor grid could be removed or set near-invisible

Issues Found

1. CQ-01 MINOR: Two helper functions defined — violates KISS structure
   • Fix: Inline floor_box at call sites; or keep build_pf as an acceptable complexity trade-off
2. DE-02 MINOR: Both major and minor grid lines visible, creating slight busyness
   • Fix: Remove minor grid lines (panel.grid.minor = element_blank()) or reduce to linewidth ~0.04
3. DE-03 MODERATE: Trend lines from every column create many overlapping lines, diluting clarity
   • Fix: Draw only the last 3–5 support/resistance lines rather than from every column

AI Feedback for Next Attempt

Score 87/100 — approved at Attempt 2 threshold (≥80). No repair needed. For future reference: fewer, more selective trend lines (last 3–5 rather than all columns) would improve storytelling clarity; removing minor grid lines would clean up visual refinement.

Verdict: APPROVED