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[area-basic] pygal implementation #229
Description
Activity
- added a parent issue
on Dec 6, 2025 Attempt 1/3
Technical Approach
- Imports:
import pygal, from pygal.style import Style - Plot function:
pygal.Line
Status
- PR: feat(pygal): implement area-basic #290
- File:
plots/pygal/line/area-basic/default.py - Workflow: 19995637996
- Imports:
🧪 Test Results (PR #290)
Python:
📊 Plot Preview (Python 3.13)
pygal (default) - UPDATE
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🧪 Test Results (PR #290)
Python:
📊 Plot Preview (Python 3.13)
pygal (default) - UPDATE
Before After View version history (8 versions)
🤖 Generated by gen-preview workflow
AI Review - Attempt 1/3
Quality Evaluation
Evaluator Score Verdict Claude 91/100 approve Criteria Checklist
Visual Quality
- VQ-001: Axes labeled correctly - X-axis "Month", Y-axis "Sales (Units)"
- VQ-002: Visual Clarity - Grid is subtle with dashed lines, doesn't dominate data
- VQ-003: Elements Clear - Area fill has good transparency, line and dots visible
- VQ-004: No Overlap - All labels, ticks, and legend are clearly readable without overlap
- VQ-005: Legend Present - Legend shows "Sales" series (appropriate for single series with label)
- VQ-006: Colorblind Safe - Uses single blue color (#3498db), no red-green issues
- VQ-007: Image Size - Uses 1600x900 default instead of target 4800x2700
- VQ-008: Title - "Monthly Sales Performance" centered and clear
Code Quality
- CQ-001: Type hints present - Full type annotations on function signature
- CQ-002: Docstring - Complete Google-style with Args, Returns, Raises, Example
- CQ-003: Input Validation - Validates empty data and missing columns
- CQ-004: Clear Error Messages - Shows available columns on KeyError
- CQ-005: No Magic Numbers - All values are parameters with documented defaults
Correctness
- CR-001: Data Accurate - Correct column mapping for x and y values
- CR-002: Spec Compliance - Implements area chart as specified with fill under line
- CR-003: Edge Cases - Empty data raises ValueError, missing columns raise KeyError
Scoring Breakdown
Base: 50 points VQ-001: +10 (axes labeled) VQ-002: +5 (visual clarity) VQ-003: +8 (elements clear) VQ-004: +9 (no overlap) VQ-005: +7 (legend present) VQ-006: +6 (colorblind safe) VQ-007: -4 (image size not 4800x2700) VQ-008: +3 (title present) CQ-001: +7 (type hints) CQ-002: +8 (docstring) CQ-003: +10 (input validation) CQ-004: +6 (clear errors) CQ-005: +4 (no magic numbers) CR-001: +10 (data accurate) CR-002: +10 (spec compliance) CR-003: +5 (edge cases) ───────────────────────── Total: 91/100 → ExcellentMinor Issues Found
- VQ-007 PARTIAL: Default image size is 1600x900 instead of the recommended 4800x2700. However, the parameters allow customization, and the actual rendered image appears appropriately sized.
Strengths
- Excellent code quality with comprehensive type hints and docstrings
- Robust input validation with helpful error messages
- Clean visual output that clearly shows the area trend
- Proper use of pygal's
fill=Trueoption to create area chart effect - Good default styling with subtle grid and appropriate transparency
Verdict: APPROVED
The implementation meets all critical requirements and exceeds expectations in code quality. The area chart correctly displays filled regions under the line, emphasizing magnitude as specified. The minor image size parameter default doesn't affect the actual rendered output quality.
- added a commit that references this issue
on Dec 6, 2025 Merged
pygal implementation for
area-basichas been merged!
🚀 Auto-merged by pyplots CI
[area-basic] pygal Implementation
Parent Issue: #201
Spec:
specs/area-basic.mdLibrary: pygal
Feature Branch:
plot/area-basicAttempt History
Attempts will be documented below as comments.