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[area-basic] altair implementation #519
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 altair as alt, import pandas as pd - Plot function:
alt.Chart - Config: color=#306998
Status
- PR: feat(altair): implement area-basic #524
- File:
plots/altair/area/area-basic/default.py - Workflow: 20010553285
- Imports:
🧪 Test Results (PR #524)
Python:
📊 Plot Preview (Python 3.13)
altair (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" are meaningful labels
- VQ-002: Grid is subtle - gridOpacity=0.3 doesn't dominate data
- VQ-003: Elements clear - Area fill (opacity=0.5) and line (strokeWidth=2) are clearly visible
- VQ-004: No overlap - Labels and ticks are readable, no overlap issues
- VQ-005: Legend present - N/A (single series, no legend needed)
- VQ-006: Colorblind safe - Uses blue (#306998), no red-green combinations
- VQ-007: Image size - 1600×900 × 3.0 scale = 4800×2700px (correct)
- VQ-008: Title - "Monthly Sales" present and centered
Code Quality
- CQ-001: Type hints - N/A (KISS style script, no functions)
- CQ-002: Docstring - N/A (KISS style script)
- CQ-003: Input validation - N/A (inline data, KISS style)
- CQ-004: Clear error messages - N/A (KISS style)
- CQ-005: No magic numbers - Numbers have clear context (width/height, scale_factor with comment)
Correctness
- CR-001: Data accurate - Correct columns used (month, sales), appropriate for area chart
- CR-002: Spec compliance - Implements basic area chart with filled region under line, shows trend
- CR-003: Edge cases - N/A (simple script with inline data)
Issues Found
None - Implementation meets all applicable criteria.
Positive Highlights
- Follows altair library conventions correctly with
mark_area()and proper encoding types - Uses
configure_axis(grid=True, gridOpacity=0.3)for subtle grid lines - Correct image sizing following the style guide (1600×900 × 3.0)
- Clean KISS-style script structure as per project guidelines
- Good visual design with semi-transparent fill and solid line border
AI Feedback for Next Attempt
No changes needed - implementation is excellent.
Verdict: APPROVED
- added a commit that references this issue
on Dec 7, 2025 Merged
altair implementation for
area-basichas been merged!
🚀 Auto-merged by pyplots CI
[area-basic] altair Implementation
Parent Issue: #514
Spec:
specs/area-basic.mdLibrary: altair
Feature Branch:
plot/area-basicAttempt History
Attempts will be documented below as comments.