feat(highcharts): implement heatmap-interactive

[github-actions]

Implementation: heatmap-interactive - highcharts

Implements the highcharts version of heatmap-interactive.

File: plots/heatmap-interactive/implementations/highcharts.py

Parent Issue: #3289

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🤖 impl-generate workflow

[claude]

AI Review - Attempt 1/3

Image Description

The plot displays an interactive heatmap showing website traffic data by hour of day (x-axis, 24 hours from 00:00 to 23:00) and day (y-axis, 20 days spanning Monday through Week 3 Sat). The heatmap uses a blue sequential color scale ranging from very light blue/white (low values ~0) to dark navy blue (high values ~2250 visitors). The title reads "Website Traffic by Hour · heatmap-interactive · highcharts · pyplots.ai" with a subtitle explaining zoom/pan controls. A vertical color legend labeled "Visitors" appears on the right side. Clear patterns show higher traffic during business hours (9-17) on weekdays and lower traffic overnight and on weekends. X-axis labels are rotated at 315 degrees for readability. White borders separate each cell.

Quality Score: 91/100

Criteria Checklist

Visual Quality (37/40 pts)

• VQ-01: Text Legibility (9/10) - Title, axis labels, and legend are readable; tick labels slightly small but acceptable
• VQ-02: No Overlap (8/8) - No overlapping text elements; rotated x-axis labels are well-spaced
• VQ-03: Element Visibility (8/8) - Heatmap cells are well-sized with clear color differentiation and white borders
• VQ-04: Color Accessibility (5/5) - Blue sequential colormap is colorblind-safe
• VQ-05: Layout Balance (5/5) - Plot fills canvas well, legend positioned appropriately on right
• VQ-06: Axis Labels (2/2) - "Hour of Day" and "Day" are descriptive
• VQ-07: Grid & Legend (0/2) - No grid lines (acceptable for heatmap), but legend title "Visitors" lacks units

Spec Compliance (23/25 pts)

• SC-01: Plot Type (8/8) - Correct heatmap chart type
• SC-02: Data Mapping (5/5) - X=hours, Y=days, value=traffic correctly mapped
• SC-03: Required Features (4/5) - Has hover tooltips (in HTML), zoom/pan, reset button; crosshair/highlight on hover implemented via brightness change (-1 for not visible in static PNG)
• SC-04: Data Range (3/3) - All data visible, colorbar shows full range 0-2250
• SC-05: Legend Accuracy (2/2) - Legend correctly shows "Visitors" with proper scale
• SC-06: Title Format (1/2) - Title uses descriptive text before spec-id instead of just spec-id format

Data Quality (19/20 pts)

• DQ-01: Feature Coverage (7/8) - Shows weekday/weekend patterns, hourly patterns, good variation; could show more extreme outliers
• DQ-02: Realistic Context (7/7) - Website traffic by hour/day is a realistic, neutral scenario
• DQ-03: Appropriate Scale (5/5) - Visitor counts 0-2250 are realistic for hourly website traffic

Code Quality (9/10 pts)

• CQ-01: KISS Structure (3/3) - Linear script structure, no functions/classes
• CQ-02: Reproducibility (3/3) - np.random.seed(42) set
• CQ-03: Clean Imports (2/2) - All imports are used
• CQ-04: No Deprecated API (1/1) - Uses current highcharts-core API
• CQ-05: Output Correct (0/1) - Saves plot.png but also creates plot.html (acceptable for interactive library)

Library Features (3/5 pts)

• LF-01: Distinctive Features (3/5) - Uses Highcharts heatmap module, zoom/pan, tooltips, reset button, hover states; could utilize boost module more effectively for large data or add more advanced interactivity

Strengths

• Excellent use of Highcharts interactive features: zoom/pan, tooltips, reset button, hover highlighting
• Clean blue sequential colormap that is colorblind-safe
• Realistic website traffic data with clear weekday/weekend and day/night patterns
• Well-structured code with proper inline JS embedding for Selenium screenshot
• Good cell sizing with white borders for clear separation

Weaknesses

• Title format has descriptive prefix "Website Traffic by Hour" before the spec-id format
• Legend title "Visitors" could include units (e.g., "Visitors (count)")
• Could utilize Highcharts boost module more effectively for performance demonstration

Verdict: APPROVED