feat(highcharts): implement gauge-basic

[github-actions]

Implementation: gauge-basic - javascript/highcharts

Implements the javascript/highcharts version of gauge-basic.

File: plots/gauge-basic/implementations/javascript/highcharts.js

Parent Issue: #857

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🤖 impl-generate workflow

[claude]

AI Review - Attempt 1/3

Image Description

Light render (plot-light.png): Semi-circular donut gauge on a warm off-white (#FAF8F1) background. The gauge has three color zones: red (#AE3030) for 0–30, amber (#DDCC77) for 30–70, and brand green (#009E73) for 70–100. A black needle extends from a hub dot at the gauge pivot toward the green zone, indicating a value of 72 (just past the 70 threshold). The large bold "72" is centered inside the donut hole with "/ 100" in gray below it. "Customer Satisfaction Score" appears below the hub in dark bold text. A three-column zone legend at the bottom shows range labels in their respective semantic colors with descriptive names below in gray. Title "gauge-basic · javascript · highcharts · anyplot.ai" at the top in dark near-black text. All text is clearly readable against the light background with no light-on-light issues.

Dark render (plot-dark.png): Same layout on a warm near-black (#1A1A17) background. All three zone colors are identical to the light render (#AE3030, #DDCC77, #009E73 — unchanged, as required). The needle and hub dot are now rendered in white/near-white (t.ink flipped). The "72" value, title, and "Customer Satisfaction Score" label are all in light text clearly readable against the dark background. Zone range labels retain their semantic colors; description labels appear in muted gray (t.inkSoft dark token). No dark-on-dark failures detected. Brand green #009E73 remains fully visible on the dark surface.

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

Score: 91/100

Category	Score	Max
Visual Quality	29	30
Design Excellence	14	20
Spec Compliance	15	15
Data Quality	15	15
Code Quality	10	10
Library Mastery	8	10
Total	91	100

Visual Quality (29/30)

• VQ-01: Text Legibility (8/8) — All font sizes explicitly set (title 22px dynamic, value 66px, labels 18px, zone labels 15px/14px). Well-proportioned at desktop and mobile widths.
• VQ-02: No Overlap (6/6) — No overlapping elements. Needle angle geometry keeps it clear of the centered "72" text.
• VQ-03: Element Visibility (6/6) — Wide donut arcs, prominent needle, large value display, well-sized zone legend — all clearly visible.
• VQ-04: Color Accessibility (2/2) — Traffic-light semantic pattern with redundant text labels; not relying on color alone for distinction.
• VQ-05: Layout & Canvas (3/4) — Square canvas correctly chosen for gauge. Content fills ~55–60% of canvas. Minor whitespace above title and below zone legend could be tightened.
• VQ-06: Axis Labels & Title (2/2) — No axes (appropriate). Metric name "Customer Satisfaction Score" prominently displayed. Title format correct.
• VQ-07: Palette Compliance (2/2) — Semantic anchors used correctly: #AE3030 bad/red, #DDCC77 amber warning, #009E73 brand green excellent. Transparent background passes through to pageBg. Chrome (t.ink/t.inkSoft) correctly theme-adaptive in both renders.

Design Excellence (14/20)

• DE-01: Aesthetic Sophistication (6/8) — Strong design: intentional semantic color assignment, custom SVG needle and hub dot via chart.renderer, large value display creates clear visual focal point. Clearly above library defaults.
• DE-02: Visual Refinement (4/6) — Clean minimal design: borderWidth: 0, no grid, no unnecessary axes. Explicit margins. Some polish evident.
• DE-03: Data Storytelling (4/6) — Needle position + color zones immediately communicate that 72/100 CSAT is "just excellent" (barely past the 70 threshold). Visual hierarchy: large value → needle → color zones → legend.

Spec Compliance (15/15)

• SC-01: Plot Type (5/5) — Semi-circular gauge chart with needle, color zones, and value display — exactly as specified.
• SC-02: Required Features (4/4) — All features present: value=72, min=0, max=100, thresholds at 30 and 70, three zones with correct red/yellow/green conventions, needle indicator, prominent value label.
• SC-03: Data Mapping (3/3) — Needle correctly at 72% (arc proportions 30/40/30 matching threshold splits).
• SC-04: Title & Legend (3/3) — Title exactly matches required format. Zone legend correctly describes ranges and quality levels.

Data Quality (15/15)

• DQ-01: Feature Coverage (6/6) — Full gauge spectrum shown with three distinct zones and needle crossing a threshold boundary.
• DQ-02: Realistic Context (5/5) — Customer Satisfaction Score (CSAT) is a real, widely-used business KPI. Neutral and non-controversial.
• DQ-03: Appropriate Scale (4/4) — 0–100 CSAT scale is industry-standard. Thresholds at 30/70 are common CSAT interpretation boundaries. Score 72 is realistic.

Code Quality (10/10)

• CQ-01: KISS Structure (3/3) — Clean sequential: data constants → chart config → SVG overlays. No functions or classes.
• CQ-02: Reproducibility (2/2) — All data hardcoded. No randomness.
• CQ-03: Clean Imports (2/2) — No imports (JS globals only). Only window.ANYPLOT_TOKENS and Highcharts used.
• CQ-04: Code Elegance (2/2) — SVG overlay calculations are appropriately complex for custom gauge needle geometry. forEach for zone legend is clean. No over-engineering.
• CQ-05: Output & API (1/1) — Correct Highcharts.chart("container", …) API. animation: false on chart and series. Credits disabled. Output handled by harness.

Library Mastery (8/10)

• LM-01: Idiomatic Usage (5/5) — Expert use of Highcharts API: chart.renderer for SVG overlays, ps.center to get actual rendered dimensions, donut pie as gauge base. All Highcharts patterns followed correctly.
• LM-02: Distinctive Features (3/5) — Uses chart.renderer (Highcharts-specific SVG API) for needle/hub/text overlays. Uses ps.center to compute actual rendered positions — a Highcharts-specific runtime pattern. The donut-pie-as-gauge approach is a known Highcharts creative technique.

Score Caps Applied

• None

Strengths

• Clever donut-pie + custom SVG overlay approach to build a gauge since highcharts-more gauge module is unavailable in core — demonstrates deep library knowledge
• Semantic color assignment (red/amber/green) is intentional and exactly matches spec requirements using correct Imprint palette anchors
• Custom needle and hub dot via chart.renderer API give the chart a polished, professional look well above library defaults
• Correct //# anyplot-orientation: square directive for a radial/gauge chart
• All font sizes explicitly set; large "72" value inside the donut hole creates strong visual hierarchy
• Perfect spec compliance and data quality
• Chrome correctly theme-adaptive in both renders (needle and hub flip with t.ink)

Weaknesses

• Minor canvas utilization: noticeable empty whitespace above the title and below the zone legend in the 2400×2400 canvas — consider increasing gauge size or reducing top margin to better fill the square canvas
• Design Excellence ceiling: the aesthetic is strong but could be elevated further (e.g. a subtle arc track or refined hub design would push toward publication-ready)
• LM-02: chart.renderer approach is Highcharts-specific but the needle could use an arc path instead of a simple line for a more distinctive Highcharts SVG rendering showcase

Issues Found

1. VQ-05 MINOR: Gauge occupies ~55–60% of the 2400×2400 canvas — some wasted whitespace above and below the content
   • Fix: Increase size: "90%" closer to full, reduce top chart margin from 60 to ~30, or enlarge the overall gauge proportions
2. LM-02 GAP: Simple line needle when Highcharts renderer supports arc paths natively
   • Fix: Use chart.renderer.arc() for a wedge-shaped needle for a more distinctive Highcharts showcase

AI Feedback for Next Attempt

This is a strong first attempt that passes with 91/100. If repair is triggered, focus on: (1) tighter canvas utilization — push the gauge larger within the square canvas, (2) consider a more refined needle design using Highcharts renderer arc paths, (3) the DE-01 score of 6 could reach 8 with a subtle outer ring/track or more sophisticated hub design.

Verdict: APPROVED