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[area-basic] altair implementation #219
Description
Activity
- added a parent issue
on Dec 6, 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 #375
- File:
plots/altair/area/area-basic/default.py - Workflow: 19995637996
- Imports:
🧪 Test Results (PR #375)
Python:
📊 Plot Preview (Python 3.13)
altair (default) - UPDATE
Before After View version history (2 versions)
🤖 Generated by gen-preview workflow
AI Review - Attempt 1/3
Quality Evaluation
Evaluator Score Verdict Claude 88/100 approve Criteria Checklist
- VQ-001: Axes labeled correctly ("Month", "Sales")
- VQ-002: Grid is subtle (opacity=0.3)
- VQ-003: Elements clear (area visible with opacity=0.5, line overlay)
- VQ-004: No overlap - labels and ticks readable
- VQ-005: N/A - Single series, no legend needed
- VQ-006: Colorblind safe - single blue color
- VQ-007: Image size correct (4800×2700px via scale_factor=3.0)
- VQ-008: Title present and centered
- CQ-001-005: N/A - Plot implementations use KISS style (no functions/classes)
- CR-001: Data accurate - correct columns used
- CR-002: Spec compliance - implements area chart showing trend
- CR-003: N/A - Simple script style
Minor Observations
- X-axis decimal ticks: Using
:Q(Quantitative) encoding for month produces decimal tick marks (1.2, 1.4, etc.) which isn't ideal for discrete months. Using:O(Ordinal) or categorical month names would be more appropriate, but this doesn't significantly impact visual quality. - Data simplification: Implementation uses 6 data points vs spec example's 12 months - acceptable variation for demonstration purposes.
Positive Notes
- Clean implementation following altair best practices
- Proper use of
mark_area()withmark_line()overlay for emphasis - Correct 16:9 aspect ratio and font sizing
- Good color choice with consistent styling
AI Feedback for Next Attempt
No changes required - implementation meets quality threshold.
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: #201
Spec:
specs/area-basic.mdLibrary: altair
Feature Branch:
plot/area-basicAttempt History
Attempts will be documented below as comments.