[area-basic] highcharts implementation

[github-actions]

[area-basic] highcharts Implementation

Parent Issue: #201
Spec: specs/area-basic.md
Library: highcharts
Feature Branch: plot/area-basic

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Attempt History

Attempts will be documented below as comments.

[github-actions]

Attempt 1/3

Technical Approach

• Imports: import tempfile, import time, import urllib.request
• Config: style=margin:0;, color=#306998

Status

• PR: feat(highcharts): implement area-basic #505
• File: plots/highcharts/area/area-basic/default.py
• Workflow: 20010154898

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[github-actions]

🧪 Test Results (PR #505)

Python:

📊 Plot Preview (Python 3.13)

highcharts (default) - UPDATE

Before	After

View version history (6 versions)

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🤖 Generated by gen-preview workflow

[claude]

AI Review - Attempt 1/3

Quality Evaluation

Evaluator	Score	Verdict
Claude	88/100	approve

Criteria Checklist

Visual Quality

• VQ-001: Axes labeled correctly - Y-axis shows "Sales ($)", X-axis shows month categories (Jan-Dec)
• VQ-002: Visual clarity - Grid is subtle (10% opacity), does not dominate data
• VQ-003: Elements clear - Area fill is clearly visible with good opacity (50%), line width is 4px, markers visible
• VQ-004: No overlap - Labels, ticks are well-spaced and readable
• VQ-005: Legend present - N/A (single series, legend correctly disabled)
• VQ-006: Colorblind safe - Single color (#306998 Python Blue), no problematic color combinations
• VQ-007: Image size - 4800x2700px as required (16:9 aspect ratio)
• VQ-008: Title - "Monthly Sales Trend" is centered and clear with appropriate font size

Code Quality

• CQ-001: Type hints - Not present (but per CLAUDE.md, plot implementations follow KISS style - no type hints required)
• CQ-002: Docstring - Not present (but per CLAUDE.md, plot implementations follow KISS style - no docstrings required)
• CQ-003: Input validation - Not present (but script-style implementation with hardcoded data)
• CQ-004: Clear error messages - N/A for script-style plot
• CQ-005: No magic numbers - Numbers are contextually clear (sales data, chart dimensions documented in style guide)

Correctness

• CR-001: Data accurate - Monthly sales data correctly mapped to x (months) and y (values)
• CR-002: Spec compliance - Implements basic area chart with filled region under line, emphasizes magnitude
• CR-003: Edge cases - N/A for script-style example with fixed data

Issues Found

1. Minor: X-axis title "Month" is defined in code but not visible in output (may be hidden by category labels). This is a minor visual issue.

Strengths

• Clean, readable script following KISS principles per project guidelines
• Proper use of Selenium for PNG export with inline Highcharts JS
• Good visual styling with Python Blue color scheme
• Appropriate font sizes for high-resolution output
• Correct container specification for Highcharts

AI Feedback for Next Attempt

No major issues. The implementation successfully creates a basic area chart that matches the specification requirements.

Verdict: APPROVED

The implementation meets the quality threshold (88/100 >= 85). The code follows the project's KISS style for plot implementations and produces a visually clear area chart that emphasizes magnitude and trends as specified.