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[area-basic] matplotlib implementation #515
Description
Activity
- added a parent issue
on Dec 7, 2025 - added a commit that references this issue
on Dec 7, 2025 Attempt 1/3
Technical Approach
- Imports:
import matplotlib.pyplot as plt, import pandas as pd - Plot function:
ax.plot - Config: figsize=16, 9, style=--, color=#306998
Status
- PR: feat(matplotlib): implement area-basic #526
- File:
plots/matplotlib/fill_between/area-basic/default.py - Workflow: 20010553285
- Imports:
🧪 Test Results (PR #526)
Python:
📊 Plot Preview (Python 3.13)
matplotlib (default) - UPDATE
Before After View version history (5 versions)
🤖 Generated by gen-preview workflow
AI Review - Attempt 1/3
Quality Evaluation
Evaluator Score Verdict Claude 92/100 approve Criteria Checklist
Visual Quality:
- VQ-001: Axes labeled correctly ("Month" and "Sales" - meaningful labels)
- VQ-002: Visual clarity (grid is subtle with alpha=0.3, dashed style)
- VQ-003: Elements clear (area fill with alpha=0.5, line with width=2)
- VQ-004: No overlap (all labels and ticks readable, no overlapping)
- VQ-005: Legend present (N/A - single series, no legend needed)
- VQ-006: Colorblind safe (uses blue #306998, no red-green combination)
- VQ-007: Image size (16x9 aspect ratio at dpi=300)
- VQ-008: Title present ("Basic Area Chart" - centered and clear)
Code Quality:
- CQ-001: Type hints (N/A - KISS style for plot implementations per CLAUDE.md)
- CQ-002: Docstring (N/A - KISS style, has module docstring identifying spec/library)
- CQ-003: Input validation (N/A - KISS style script, not a function)
- CQ-004: Clear error messages (N/A - KISS style)
- CQ-005: No magic numbers (acceptable for plot scripts)
Correctness:
- CR-001: Data accurate (uses exact data from spec: months and sales values)
- CR-002: Spec compliance (area chart with filled region, proper trend visualization)
- CR-003: Edge cases (N/A - KISS style with hardcoded example data)
Library-Specific (matplotlib.md):
- Uses
fig, ax = plt.subplots(figsize=(16, 9)) - Uses Axes methods (ax.fill_between, ax.plot, ax.set_*)
- Saves with
plt.savefig('plot.png', dpi=300, bbox_inches='tight') - Uses
plt.tight_layout() - Folder path correct:
plots/matplotlib/fill_between/area-basic/
Issues Found
None - implementation is clean and follows all guidelines.
Minor Observations (not affecting score)
- Title says "Basic Area Chart" but code docstring says "Monthly Sales Volume" - minor inconsistency but the visual output matches the spec intent
- Y-axis correctly starts at 0 for proper area representation
Scoring Breakdown
Base: 50 points +10 (VQ-001: axes labeled) +5 (VQ-002: visual clarity) +8 (VQ-003: elements clear) +9 (VQ-004: no overlap) +0 (VQ-005: legend N/A) +6 (VQ-006: colorblind safe) +4 (VQ-007: image size) +3 (VQ-008: title) +0 (CQ-001 to CQ-005: N/A for KISS plots) +10 (CR-001: data accurate) +10 (CR-002: spec compliance) -3 (minor title inconsistency between code and output) = 92 → EXCELLENTVerdict: APPROVED
The implementation correctly creates a basic area chart using matplotlib's
fill_betweenmethod. It uses the exact data from the spec, follows all matplotlib library guidelines, and produces a visually clear and professional chart. The KISS style is appropriate per project guidelines for plot implementations.- added a commit that references this issue
on Dec 7, 2025 Merged
matplotlib implementation for
area-basichas been merged!
🚀 Auto-merged by pyplots CI
[area-basic] matplotlib Implementation
Parent Issue: #514
Spec:
specs/area-basic.mdLibrary: matplotlib
Feature Branch:
plot/area-basicAttempt History
Attempts will be documented below as comments.