[histogram-basic] altair implementation

[histogram-basic] altair Implementation

Parent Issue: #204
Spec: specs/histogram-basic.md
Library: altair
Feature Branch: plot/histogram-basic

Attempt History

Attempts will be documented below as comments.

Attempt 1/3

Technical Approach

Imports: import altair as alt, import numpy as np, import pandas as pd
Plot function: alt.Chart
Config: color=#306998

Status

PR: feat(altair): implement histogram-basic #289
File: plots/altair/bar/histogram-basic/default.py
Workflow: 19995638202

🧪 Test Results (PR #289)

Python:

📊 Plot Preview (Python 3.13)

altair (default) - NEW

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🧪 Test Results (PR #289)

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	92/100	approve

Criteria Checklist

Visual Quality:

VQ-001: Axes labeled correctly ("Value" on X, "Frequency" on Y)
VQ-002: Visual clarity - clean presentation without dominating grid
VQ-003: Elements clear - bars visible with appropriate opacity (0.8)
VQ-004: No overlap - labels, ticks, title all readable and separate
VQ-005: Legend present - N/A (single series histogram, no legend needed)
VQ-006: Colorblind safe - uses #306998 (blue), safe for colorblind users
VQ-007: Image size - 1600×900 at scale_factor=3.0 = 4800×2700 ✓
VQ-008: Title - "Basic Histogram" present and centered

Code Quality (KISS style for plots - no functions/type hints/docstrings required):

CQ-001: Type hints - N/A (KISS style for plots)
CQ-002: Docstring - N/A (KISS style for plots)
CQ-003: Input validation - N/A (KISS style for plots)
CQ-004: Clear error messages - N/A (KISS style for plots)
CQ-005: No magic numbers - N/A (KISS style for plots)

Correctness:

CR-001: Data accurate - uses normal distribution with mean=100, std=15, n=500 as per spec
CR-002: Spec compliance - histogram showing frequency distribution with appropriate bins
CR-003: Edge cases - N/A (KISS style for plots)

Issues Found

None - implementation meets all requirements.

Positive Observations

Clean, sequential code following KISS principles
Proper use of Altair's mark_bar() for histogram
Correct binning with alt.Bin(maxbins=30)
Appropriate axis labels and title
Font sizes configured for readability (labelFontSize=16, titleFontSize=20)
Correct image dimensions for export

AI Feedback for Next Attempt

No changes needed - implementation is ready for merge.

Verdict: APPROVED

feat(altair): implement histogram-basic (#289)

Merged

altair implementation for histogram-basic has been merged!

PR: feat(altair): implement histogram-basic #289

🚀 Auto-merged by pyplots CI

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[histogram-basic] altair implementation #236