feat(echarts): implement dumbbell-basic

[github-actions]

Implementation: dumbbell-basic - javascript/echarts

Implements the javascript/echarts version of dumbbell-basic.

File: plots/dumbbell-basic/implementations/javascript/echarts.js

Parent Issue: #945

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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) — correct. Title "Digital Transformation · dumbbell-basic · javascript · echarts · anyplot.ai" centered at top in dark text, clearly readable. Legend shows "Before" (green circle) and "After" (blue circle) centered below title, both legible. Ten horizontal dumbbells: Y-axis lists department categories (Sales at top, Legal at bottom), X-axis shows "Efficiency Score" 40–100. "Before" dots render in brand green (#009E73), "After" dots in blue (#4467A3), connected by thin semi-transparent gray lines (opacity 0.4). Vertical grid lines visible but subtle via t.grid token. All text is readable against the light background — no light-on-light failures.

Dark render (plot-dark.png): Warm near-black background (#1A1A17) — correct. Title and all labels appear in light text — fully readable against dark background. No dark-on-dark failures observed. Data colors are identical to the light render: brand green (#009E73) for "Before", blue (#4467A3) for "After" — only chrome (text, grid, background) flips between themes. Brand green #009E73 is clearly visible on the dark surface.

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

Score: 87/100

Category	Score	Max
Visual Quality	28	30
Design Excellence	12	20
Spec Compliance	15	15
Data Quality	14	15
Code Quality	10	10
Library Mastery	8	10
Total	87	100

Visual Quality (28/30)

• VQ-01: Text Legibility (7/8) — All font sizes explicitly set (title dynamic-scaled, legend 14px, axis name 14px, ticks 13px). Proportional and readable in both themes. Minor: 13px tick labels slightly small for mobile scaling.
• VQ-02: No Overlap (6/6) — No overlapping elements; Y-axis labels well-spaced for 10 categories.
• VQ-03: Element Visibility (6/6) — symbolSize=20 well-proportioned for 10 sparse data points; connector opacity=0.4 is subtle yet visible.
• VQ-04: Color Accessibility (2/2) — Brand green + blue are CVD-safe with good luminance contrast; distinguishable under deuteranopia/protanopia.
• VQ-05: Layout & Canvas (4/4) — Good margins (left:130, right:60, top:100, bottom:70). Plot fills ~60% of canvas with balanced whitespace. Nothing cut off.
• VQ-06: Axis Labels & Title (2/2) — "Efficiency Score" is descriptive; department names on Y-axis need no unit.
• VQ-07: Palette Compliance (1/2) — First series correctly uses palette[0] (#009E73 ✓). However, "After" series uses palette[2] (#4467A3 blue) skipping palette[1] (#C475FD lavender) without a semantic justification — Before/After carry no strong real-world color expectation. Backgrounds and all chrome are correctly theme-adaptive.

Design Excellence (12/20)

• DE-01: Aesthetic Sophistication (4/8) — Clean and professional with correct palette and a descriptive title prefix, but no emphasis differentiates large-gain departments (Engineering/Sales +26) from small-gain ones (Legal +6). Sits at "well-configured library default" level.
• DE-02: Visual Refinement (4/6) — X-axis line and ticks hidden (clean). Y-axis ticks hidden. Connector opacity reduced. Vertical grid lines (xAxis.splitLine) are fairly prominent across the full plot area — removing them would sharpen the dumbbell aesthetic.
• DE-03: Data Storytelling (4/6) — Departments sorted by descending improvement (largest gain at top) is an intentional storytelling choice. However, all connectors are uniform size/opacity regardless of delta magnitude — no visual hierarchy guides the eye to standout performers.

Spec Compliance (15/15)

• SC-01: Plot Type (5/5) — Correct horizontal dumbbell chart: two dots per category connected by a line, categories on Y-axis.
• SC-02: Required Features (4/4) — Distinct colors for start/end, thin connector lines, horizontal orientation, sorted by improvement.
• SC-03: Data Mapping (3/3) — X-axis: numeric efficiency score; Y-axis: departments. All 10 data points visible.
• SC-04: Title & Legend (3/3) — Title format correct with optional descriptive prefix. Legend labels "Before"/"After" match the data.

Data Quality (14/15)

• DQ-01: Feature Coverage (5/6) — Good variation in improvement magnitudes (+6 to +26). Weakness: all 10 departments show positive change — 1–2 departments with slight decline would demonstrate the full before/after range and avoid implying transformation is uniformly positive.
• DQ-02: Realistic Context (5/5) — Department efficiency scores before/after digital transformation: plausible, neutral business scenario.
• DQ-03: Appropriate Scale (4/4) — Scores 55–91 on 0–100 scale, improvements +6 to +26 — factually plausible.

Code Quality (10/10)

• CQ-01: KISS Structure (3/3) — Linear: data → init → setOption. No unnecessary abstractions.
• CQ-02: Reproducibility (2/2) — All data hard-coded — fully deterministic.
• CQ-03: Clean Imports (2/2) — No imports needed; window globals used correctly.
• CQ-04: Code Elegance (2/2) — Clean, appropriate complexity. renderItem for connectors is the right ECharts pattern. No fake UI.
• CQ-05: Output & API (1/1) — ECharts is interactive; harness emits both PNG and HTML. Current ECharts 5.5.1 API used.

Library Mastery (8/10)

• LM-01: Idiomatic Usage (5/5) — Expertly uses ECharts patterns: custom series with renderItem for arbitrary geometry, encode for axis binding, tooltip formatter — all idiomatic.
• LM-02: Distinctive Features (3/5) — custom series type with renderItem is ECharts-distinctive and not easily replicated in other libraries. Could push further (e.g., markPoint for highlighting best/worst, visualMap for delta-magnitude encoding).

Score Caps Applied

• None

Strengths

• Correct horizontal dumbbell chart — full spec compliance on all 4 criteria
• Brand green (#009E73) correctly assigned to "Before" series (palette position 1)
• Elegant use of ECharts custom series + renderItem for connector lines — advanced idiomatic pattern
• Departments sorted by descending improvement — intentional data storytelling
• Descriptive title prefix "Digital Transformation ·" adds meaningful context
• All font sizes explicitly set; both renders pass theme-readability with no dark-on-dark failures
• Perfect code quality: KISS structure, deterministic data, clean global usage

Weaknesses

• VQ-07: "After" series uses palette[2] (#4467A3 blue) skipping palette[1] (#C475FD lavender) — fix by using t.palette[1] for the After series (no semantic reason to skip lavender here)
• DE-01/DE-03: No visual emphasis for large-gain vs small-gain departments — consider varying connector opacity or width by improvement delta (e.g. opacity: 0.15 + 0.45 * (delta / maxDelta)) to visually rank performers
• DE-02: Remove vertical grid lines (xAxis.splitLine: { show: false }) — the X-axis tick labels provide sufficient scale context; gridlines make the background busy for a dumbbell chart
• DQ-01: All 10 departments show positive improvement — include 1–2 departments with slight decline to show bidirectional capability and avoid artificially uniform narrative

Issues Found

1. VQ-07 PARTIAL: Palette ordering skips position 1 (lavender) for After series
   • Fix: Change t.palette[2] to t.palette[1] for the After scatter series and legend item
2. DE-02 LOW: Vertical grid lines add visual noise for a dumbbell chart
   • Fix: Set xAxis.splitLine: { show: false } — rely on tick labels for scale
3. DE-01/DE-03 MODERATE: No visual hierarchy between large and small improvements
   • Fix: Scale connector lineWidth or opacity proportionally to improvement delta; or vary dot size slightly for the top 3 gainers
4. DQ-01 MINOR: All-positive deltas miss bidirectional feature showcase
   • Fix: Change 2 departments (e.g. Legal: 74→72, Finance: 73→71) to show slight declines

AI Feedback for Next Attempt

Fix palette ordering: use t.palette[1] for the After series. Remove vertical grid lines (set xAxis.splitLine: { show: false }). Introduce visual hierarchy by scaling connector lineWidth or opacity proportional to improvement delta — this turns a static dumbbell into a ranked performance chart without annotations. Update 1–2 departments to show slight decline to demonstrate bidirectional capability.

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 background (#FAF8F1). The title "Digital Transformation · dumbbell-basic · javascript · echarts · anyplot.ai" appears at the top center in dark ink at a scaled font size (~21px CSS, appropriate for the 70-character string). A legend row beneath shows "Before" (brand green circle, #009E73) and "After" (lavender circle, #C475FD). Ten horizontal dumbbell rows display departments sorted top-to-bottom by descending delta: Sales/Engineering (+26) at top, Finance/Legal (−3) at bottom. Each dumbbell shows a green Before dot and lavender After dot connected by a line; line width AND opacity both scale with |delta| (thick/opaque for large changes, thin/faint for small ones). Declining connector lines render in matte red (#AE3030), making Finance and Legal immediately visually distinct. Dot sizes also scale with |delta|. Delta labels (+26, +24, +19, +17, +15, −3) appear in inkSoft to the right of each After dot. All text is clearly readable against the light background. Legibility verdict: PASS.

Dark render (plot-dark.png): The plot renders on a warm near-black background (#1A1A17). The title, category labels, axis label, legend text, and delta annotations all render in light-colored text using tokens.ink (#F0EFE8) and tokens.inkSoft (#B8B7B0) — all legible against the dark surface. No dark-on-dark failures observed. Data colors are identical to the light render: brand green Before dots, lavender After dots, matte red declining connectors. The variable-size and variable-opacity connector encoding carries through correctly. Background confirms warm near-black, not pure black. Legibility verdict: PASS.

Score: 93/100

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	9	10
Total	93	100

Visual Quality (29/30)

• VQ-01: Text Legibility (7/8) — All sizes explicitly set; title correctly scaled for long string; minor deduction for delta labels at fontSize 12 CSS px being slightly small
• VQ-02: No Overlap (6/6) — No overlapping elements in either render
• VQ-03: Element Visibility (6/6) — Dot sizes and connector widths scaled to delta magnitude; optimal density adaptation
• VQ-04: Color Accessibility (2/2) — CVD-safe Imprint palette; no red-green-only encoding
• VQ-05: Layout & Canvas (4/4) — Canvas gate passed; generous margins; no clipping
• VQ-06: Axis Labels & Title (2/2) — "Efficiency Score" descriptive; title format correct
• VQ-07: Palette Compliance (2/2) — Before = palette[0] #009E73, After = palette[1] #C475FD; transparent background inherits correct page surface; both renders theme-correct

Design Excellence (15/20)

• DE-01: Aesthetic Sophistication (6/8) — Strong design: connector width + opacity + dot size all triple-encode |delta|; semantic matte red for declining connectors; inline delta annotations. Clearly above defaults ("well-configured default" = 4, this = 6 "strong design")
• DE-02: Visual Refinement (4/6) — Good: x-axis line hidden, all tick marks removed, no split lines. Left y-axis line kept for structural reference. Generous margins. No grid limits value estimation at a glance.
• DE-03: Data Storytelling (5/6) — Strong: sort by delta reveals hierarchy; declining departments pop in red; delta labels give instant insight; multiple storytelling techniques working together

Spec Compliance (15/15)

• SC-01: Plot Type (5/5) — Correct horizontal dumbbell chart with categories on y-axis, values on x-axis
• SC-02: Required Features (4/4) — Two dots per category, connecting line, distinct colors for start/end, sorted by delta
• SC-03: Data Mapping (3/3) — Correct x/y mapping; x range 40–100 covers all data
• SC-04: Title & Legend (3/3) — "Digital Transformation · dumbbell-basic · javascript · echarts · anyplot.ai"; legend Before/After with correct colors

Data Quality (15/15)

• DQ-01: Feature Coverage (6/6) — Shows both improvements (+3 to +26) and declines (−3); wide delta range demonstrates all dumbbell aspects
• DQ-02: Realistic Context (5/5) — Department efficiency scores before/after digital transformation — real, neutral, concrete
• DQ-03: Appropriate Scale (4/4) — 10 departments (within 5–20 spec range); 0–100 efficiency scale; realistic delta values

Code Quality (10/10)

• CQ-01: KISS Structure (3/3) — Clean data → init → setOption; no top-level functions/classes
• CQ-02: Reproducibility (2/2) — All data hardcoded; fully deterministic
• CQ-03: Clean Imports (2/2) — Browser globals only; no imports
• CQ-04: Code Elegance (2/2) — Clean, well-organized; comments explain design intent; no fake UI
• CQ-05: Output & API (1/1) — Landscape directive present; echarts.init correct (no size, no devicePixelRatio); animation: false set

Library Mastery (9/10)

• LM-01: Idiomatic Usage (5/5) — custom series with renderItem is the idiomatic ECharts approach for custom geometry; encode, z, silent all used correctly
• LM-02: Distinctive Features (4/5) — renderItem in custom series is a genuinely ECharts-distinctive API enabling pixel-level custom rendering; encode for multi-dimensional data binding is ECharts-specific

Score Caps Applied

• None applied — all cap conditions clear

Strengths

• Triple-encoding of delta magnitude via connector line width + opacity + dot size — sophisticated and elegant without annotations
• Semantic matte red (#AE3030) on declining connector lines gives Finance and Legal immediate visual contrast
• Inline delta labels (+26, −3, etc.) right of each After dot — instant quantitative readability
• Sort by ascending delta puts the largest-gain departments at top — strong narrative structure
• Clean minimal chrome (no x-axis line, no tick marks, no grid) keeps full focus on the dumbbells
• custom series + renderItem is the correct ECharts-idiomatic approach; connector geometry done at the pixel level

Weaknesses

• No x-axis split lines: subtle vertical grid lines would help readers estimate exact Efficiency Score values for mid-range rows
• Delta label fontSize 12 CSS px is slightly small — 13–14px would improve readability at smaller viewport widths
• Gain connector color (inkSoft) blends into the chrome layer; using a muted Imprint palette tint for positive connectors would give more visual separation from structural elements

Issues Found

1. DE-02 MINOR: No grid at all makes it harder to read exact x-axis values — subtle splitLine with lineStyle: { color: t.grid } on the x-axis would help without adding visual noise
2. VQ-01 MINOR: Delta labels at fontSize 12 are slightly small; increase to 13–14 CSS px for better mobile readability

AI Feedback for Next Attempt

This is a strong implementation that should be approved as-is. If a repair were warranted, the priority would be: (1) add subtle x-axis split lines (splitLine: { show: true, lineStyle: { color: t.grid } } on xAxis) to aid value estimation, and (2) increase delta label fontSize from 12 to 14 CSS px.

Verdict: APPROVED