feat(highcharts): implement ridgeline-basic

[claude]

Summary

Implements ridgeline-basic for highcharts.

Parent Issue: #539
Base Branch: plot/ridgeline-basic

Files

• plots/ridgeline-basic/implementations/highcharts.py

Preview

Preview will be uploaded to GCS staging after this workflow completes.

[github-actions]

⏭️ Plot Tests Skipped

No plot files changed

Compatibility:

Note: Only Python 3.13 is required to pass. Python 3.12 is tested for compatibility.

[claude]

AI Review - Attempt 1/3

Quality Evaluation

Evaluator	Score	Verdict
Claude	87/100	approve

Criteria Checklist

Visual Quality

• VQ-001: Axes labeled correctly - X-axis: "Temperature (°C)", Y-axis: month labels via plotLines
• VQ-002: Visual clarity - Grid is subtle (alpha 0.08), clean white background
• VQ-003: Elements clear - Density curves with 0.75 opacity, 2px line width, appropriate scaling
• VQ-004: No overlap issues - Month labels positioned correctly, tooltip configured
• VQ-005: Legend - Appropriately disabled (labels identify each distribution directly)
• VQ-006: Colorblind safe - Blue to teal to yellow gradient, no red-green combinations
• VQ-007: Image size - 4800×2700 px correctly configured
• VQ-008: Title - "Monthly Temperature Distribution" with clear subtitle

Code Quality (KISS style for plot implementations)

• CQ-001: N/A - Type hints not required for KISS-style plot implementations
• CQ-002: N/A - Docstrings not required for KISS-style plot implementations
• CQ-003: N/A - Input validation not required (script generates its own data)
• CQ-004: N/A - No external inputs requiring error messages
• CQ-005: Magic numbers - Appropriate use of named variables (overlap_factor, scale_factor, etc.)

Correctness

• CR-001: Data accurate - Monthly temperature distributions with appropriate mean and variance
• CR-002: Spec compliance - All requirements met:
  • ✓ Overlapping density distributions arranged vertically
  • ✓ 12 categories (months) with 200 samples each
  • ✓ Semi-transparent fills (0.75 alpha, spec suggests 0.6-0.8)
  • ✓ Gradient coloring from winter to summer colors
  • ✓ KDE smoothing implemented
  • ✓ Slight overlap (0.7 overlap_factor)
• CR-003: Edge cases - N/A for self-contained script

Highcharts-Specific Requirements

• Uses container="container" in Chart constructor
• Downloads and inlines highcharts.js (no CDN issues in headless)
• Proper temp file handling with UTF-8 encoding
• Selenium headless Chrome screenshot
• 5-second wait for render

Minor Observations

1. Helper function gaussian_kde is acceptable for KDE computation
2. Color gradient nicely represents seasonal temperature changes
3. Interactive tooltip configured for temperature display
4. Both PNG and HTML outputs generated correctly

Issues Found

No critical issues found.

AI Feedback for Next Attempt

N/A - Implementation meets quality standards.

Verdict: APPROVED

The highcharts implementation of ridgeline-basic meets all spec requirements and follows Highcharts library guidelines. The ridgeline plot correctly displays 12 overlapping monthly temperature distributions with appropriate KDE smoothing, gradient coloring, and semi-transparent fills.