[histogram-basic] letsplot implementation

[histogram-basic] letsplot Implementation

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

Attempt History

Attempts will be documented below as comments.

Attempt 1/3

Technical Approach

Imports: import numpy as np, import pandas as pd, from lets_plot import LetsPlot, aes, element_text, geom_histogram, ggplot, ggsave, ggsize, labs, theme, theme_minimal
Plot function: ggplot
Config: color=white

Status

PR: feat(letsplot): implement histogram-basic #303
File: plots/letsplot/histogram/histogram-basic/default.py
Workflow: 19995638202

🧪 Test Results (PR #303)

Python:

📊 Plot Preview (Python 3.13)

letsplot (default) - NEW

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🧪 Test Results (PR #303)

Python:

📊 Plot Preview (Python 3.13)

letsplot (default) - UPDATE

Before	After

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AI Review - Attempt 1/3

Quality Evaluation

Evaluator	Score	Verdict
Claude	91/100	approve

Criteria Checklist

Visual Quality

VQ-001: Axes labeled correctly - X: "Value", Y: "Frequency" (meaningful labels)
VQ-002: Visual clarity - Minimal theme with subtle grid, doesn't dominate data
VQ-003: Elements clear - Bars clearly visible with good fill color (#306998), white edges, alpha=0.8
VQ-004: No overlap - Labels, ticks all readable with no overlapping text
VQ-005: Legend present - N/A (single series histogram, no legend needed)
VQ-006: Colorblind safe - Single blue color (#306998), no problematic red-green combinations
VQ-007: Image size - Exactly 4800 × 2700 px (verified via file command)
VQ-008: Title - "Basic Histogram" present and clear

Code Quality

CQ-001: Type hints - N/A for plot scripts (KISS style per guidelines)
CQ-002: Docstring - N/A for plot scripts (KISS style per guidelines)
CQ-003: Input validation - N/A for plot scripts (KISS style per guidelines)
CQ-004: Clear error messages - N/A for plot scripts (KISS style per guidelines)
CQ-005: No magic numbers - Bins=30 is reasonable standard, sizes documented in theme

Correctness

CR-001: Data accurate - Uses correct value column with normal distribution (mean=100, std=15, n=500) as specified
CR-002: Spec compliance - All requirements met: histogram showing frequency distribution of numeric data
CR-003: Edge cases - N/A for basic example with generated data

Library-Specific (letsplot.md)

Correct import pattern: from lets_plot import * components
LetsPlot.setup_html() called as required
Uses ggsize(1600, 900) with scale=3 for correct output dimensions
Follows ggplot2 grammar of graphics pattern
Correct folder structure: plots/letsplot/histogram/histogram-basic/

Issues Found

None - implementation is clean and follows all guidelines.

Positive Highlights

Clean KISS-style code: Simple script format as required, no unnecessary functions/classes
Proper lets-plot idioms: Uses correct grammar of graphics pattern with ggplot + geom_histogram + labs + theme
Good visual defaults: Blue fill with white edges provides clear bin separation
Customized text sizes: Increased font sizes (20 for title/axis labels, 16 for tick text) improve readability
Exact spec compliance: Data generation matches specification exactly (np.random.seed(42), normal(100, 15, 500))

AI Feedback for Next Attempt

No issues found. Implementation is ready to merge.

Verdict: APPROVED

feat(letsplot): implement histogram-basic (#303)

Merged

letsplot implementation for histogram-basic has been merged!

PR: feat(letsplot): implement histogram-basic #303

🚀 Auto-merged by pyplots CI

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[histogram-basic] letsplot implementation #264