[line-basic] highcharts implementation

[github-actions]

[line-basic] highcharts Implementation

Parent Issue: #205
Spec: specs/line-basic.md
Library: highcharts
Feature Branch: plot/line-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
• Plot function: LineSeries
• Config: style=margin:0;, color=#306998

Status

• PR: feat(highcharts): implement line-basic #504
• File: plots/highcharts/line/line-basic/default.py
• Workflow: 20010151736

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[github-actions]

🧪 Test Results (PR #504)

Python:

📊 Plot Preview (Python 3.13)

highcharts (default) - UPDATE

Before	After

View version history (17 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 (X: "Time", Y: "Value") - meaningful labels present
• VQ-002: Visual Clarity - Grid is subtle with dotted style and low opacity
• VQ-003: Elements Clear - Line is clearly visible with good color contrast (#4A90D9 blue)
• VQ-004: No Overlap - Labels and ticks are readable, no overlapping elements
• VQ-005: Legend Present - N/A (single series, legend correctly disabled)
• VQ-006: Colorblind Safe - Uses blue color, no red-green combinations
• VQ-007: Image Size - Uses 1600x900 default instead of 4800x2700 target (minor)
• VQ-008: Title - "Basic Line Plot" centered and clear

Code Quality

• CQ-001: Type hints present - All parameters have type hints including Optional types
• CQ-002: Docstring - Complete Google-style with Args, Returns, Raises, Example
• CQ-003: Input Validation - Checks for empty data and missing columns
• CQ-004: Clear Error Messages - Includes available columns in KeyError message
• CQ-005: No Magic Numbers - All values parameterized with sensible defaults

Correctness

• CR-001: Data Accurate - Correctly uses x/y columns from DataFrame
• CR-002: Spec Compliance - Implements line plot for trend visualization
• CR-003: Edge Cases - Handles empty data and missing columns

Issues Found

1. VQ-007 PARTIAL: Default dimensions are 1600x900 instead of the target 4800x2700 specified in the style guide. However, dimensions are configurable via parameters.

Positive Notes

• Excellent code structure with proper type hints and comprehensive docstring
• Handles both categorical and numeric x-axis data intelligently
• Proper input validation with helpful error messages
• Correct use of container="container" as per highcharts library guidelines
• Clean export via Selenium with proper CDN workaround for headless Chrome
• Alpha/transparency support with hex-to-rgba conversion

AI Feedback for Next Attempt

Consider updating default width/height to 4800x2700 to match the target image size in the style guide.

Verdict: APPROVED

The implementation is well-structured, follows best practices, and produces a clear, readable line chart that matches the spec requirements. The minor dimension deviation is acceptable as it's configurable.