academic-figures

Academic Figures — Publication-Quality Chart Generator

Generate figures from JSON/CSV data. Local execution, no data leaves the machine.

One command, verified output:

python3 scripts/gen_figure.py -t bar -d data.json -o fig.pdf --theme okabe-ito --verify
# exit 0 = rendered + no real text overlap; exit 2 = overlaps found (fix, don't ship)

Quick Start

# 0️⃣ First run: one-command environment setup (deps/CJK font/font cache/self-check)
python3 scripts/setup_env.py

# 0️⃣ Quick tour: interactive demo (pick a chart type → renders with sample data)
python3 scripts/gen_figure.py --demo --cjk
# See all themes: python3 scripts/gen_figure.py --list-themes
# Limitations of a chart type: python3 scripts/gen_figure.py --explain bar

# Bar chart with default glm palette (muted, colorblind-safe)
python3 scripts/gen_figure.py -t bar -d data.json -o figure.png \
  --title "图2 主标题 / Subtitle" --ylabel "准确率 Accuracy (%)"

# GLM signature style: muted palette + black hatching (print-friendly, colorblind-safe)
python3 scripts/gen_figure.py -t bar -d data.json -o hatch.png --style glm-hatch \
  --show-values --title "ACR50 Response Rates"

# Forest plot for meta-analysis (PDF output)
python3 scripts/gen_figure.py -t forest -d forest.json -o forest.pdf --theme okabe-ito

# Heatmap with CJK support
python3 scripts/gen_figure.py -t heatmap -d data.json -o heatmap.png --cjk \
  --cmap RdBu_r --vmin -20 --vmax 45

# Scatter with trend line, Nature style
python3 scripts/gen_figure.py -t scatter -d data.csv -o scatter.png \
  --xlabel "Baseline (%" --ylabel "Gain (%)" --theme nature

# Kaplan-Meier survival curve with log-rank test
python3 scripts/gen_figure.py -t km -d survival.json -o km.png --theme okabe-ito \
  --title "图3 Kaplan-Meier生存曲线" --xlabel "时间 (月)" --ylabel "生存概率"

# ROC curve with AUC
python3 scripts/gen_figure.py -t roc -d roc.json -o roc.png --theme okabe-ito \
  --title "图4 ROC曲线" --xlabel "1 - 特异度" --ylabel "敏感度"

# Stacked bar chart (subgroup proportions)
python3 scripts/gen_figure.py -t stacked_bar -d subgroups.json -o stacked.png --theme okabe-ito \
  --title "图5 ANCA相关血管炎器官受累"

# Dual Y-axis chart (clinical score + lab marker)
python3 scripts/gen_figure.py -t dual_axis -d dual.json -o dual.png --theme okabe-ito \
  --title "图6 CRP与DAS28随治疗变化"

# TIFF output for Lancet submission (photo content → 300dpi)
python3 scripts/gen_figure.py -t bar -d data.json -o figure.tiff --dpi 300 --theme lancet

# Nature double-column submission: width 183mm, 7pt Helvetica, min text 5pt
python3 scripts/gen_figure.py -t bar -d data.json -o nat.pdf --journal nature --column double
python3 scripts/audit_pdf.py nat.pdf --min-size 5          # font-size gate (5pt for nature)

# Horizontal bar chart with ratio annotations + GLM palette (GLM-5.2 blog style)
python3 scripts/gen_figure.py -t hbar -d throughput.json -o perf.png --theme glm \
  --show-ratio --title "Throughput Improvement" --xlabel "Normalized Throughput"

# Bar chart with hatching patterns (print-friendly, colorblind-safe)
python3 scripts/gen_figure.py -t bar -d data.json -o hatch.png --theme okabe-ito \
  --hatch --show-values --title "ACR50 Response Rates"

# GLM-5.2 blog style: alternating yellow/blue bars with black hatching (single series)
python3 scripts/gen_figure.py -t bar -d data.json -o glm_alt.png --theme glm \
  --hatch --alternate --show-values --title "Publications by Type"

# Multi-panel composite (Panel A+B+C, journal figure layout)
python3 scripts/gen_figure.py -t composite -d composite.json -o figure4.png --theme okabe-ito

# Architecture/flow diagram (research design, CONSORT-style)
python3 scripts/gen_figure.py -t diagram -d flow.json -o flow.png --theme glm --width 12 --height 6

# Supplementary legend (journal format, "Figure 1 |" style), same data JSON
python3 scripts/gen_legend.py -d data.json -t "Response to treatment" -f 1 -o legend.txt

Chart Types

Color Themes

Default theme = glm (muted elegant Morandi-style palette, colorblind-safe) — beautiful without being garish; single-series charts get a warm yellow accent so they never look monotonous.

Viewing & Choosing Themes (new in v2.0.1)

# See ALL themes with in-terminal color swatches
python3 scripts/gen_figure.py --list-themes

# Render a theme's swatch preview PNG (for docs/submission materials)
python3 scripts/gen_figure.py --theme-swatch glm -o swatch.png

# Convenient aliases (no need to memorize exact names):
#   okabe → okabe-ito   colorblind → okabe-ito   default/classic → glm
# Case-insensitive + prefix matching (--theme gla → glm)

⚠️ Recommendation: For journal submissions use --theme okabe-ito (vivid, Nature/Science standard). Nature, Science, Cell, and most major journals now require colorblind-accessible figures. Red-green color schemes are a top rejection reason.

🎨 For everyday work: the default glm is the best balance — muted, elegant, colorblind-safe, and distinctive. Avoid bright red/green/yellow schemes.

Why Okabe-Ito?

The Okabe-Ito palette (#E69F00, #56B4E9, #009E73, #F0E442, #0072B2, #D55E00, #CC79A7, #000000) is the gold standard for colorblind-safe scientific visualization:

• Explicitly recommended by Nature Methods (Wong 2011, Nat Methods 8:441)
• Default in Wilke's "Fundamentals of Data Visualization"
• All 8 colors distinguishable under protanopia, deuteranopia, and tritanopia
• Visually vibrant — no aesthetic compromise vs. traditional palettes

Journal Submission Presets (v2.0)

--journal nature|lancet + --column single|double applies the journal's exact column-width figures, font size, font family and DPI automatically. Widths are from official author guidelines:

Height follows the theme's aspect ratio; any explicit --width/--height overrides. A stderr hint reports the preset and the matching audit_pdf.py --min-size gate:

python3 scripts/gen_figure.py -t forest -d forest.json -o nat.pdf --journal nature --column double
# stderr: Journal preset: nature (double-column, width=7.20in, font=Helvetica 7pt, min text 5pt
#          — verify with audit_pdf.py --min-size 5)
python3 scripts/audit_pdf.py nat.pdf --min-size 5
# OK: no text below 5pt in nat.pdf

Data Validation & Exit Codes (v2.0)

Every run passes through validate_data(data, chart_type) — structural validation covering all 18 type/alias branches. Two severity levels:

Examples of fatal errors: bar with series of differing lengths; box/violin with labels count ≠ number of groups (see Edge Cases); ROC with curves[].auc > 1.

Verification & Quality Gates (v2.0)

Two mandatory gates for any deliverable figure, plus a third for supplementary material:

1. --verify (in-line, on PDF output)

python3 scripts/gen_figure.py -t km -d survival.json -o km.pdf --theme okabe-ito --verify
# exit 2 + message if pixel-level text overlap found — fix the mechanism, don't special-case.

2. audit_pdf.py — font-size gate (journal minimum text size)

python3 scripts/audit_pdf.py figure.pdf --min-size 5 --fail-below
# --fail-below: non-zero exit if any text span is smaller than --min-size
# --max-reports N: cap offender listing (default 20)

3. verify_overlap_pixel.py — overlap verifier (run on every delivered PDF)

python3 scripts/verify_overlap_pixel.py output.pdf
# Output: "文本对=N 候选=M 真实重叠=K" — K MUST be 0.
# Exit signal: 真实重叠=0 = no real ink overlap.

CRITICAL — do NOT trust PyMuPDF bbox overlap reports. PyMuPDF span/char bboxes use the font line-height model (Noto CJK 2.856em, DejaVu 1.695em), which systematically OVERESTIMATES rotated text (at 45°, fs=9 reports 32.3pt vs 16.8pt real ink) and stacked/rotated labels. Two bboxes intersecting does NOT mean real overlap — in practice 100% of such reports on this generator's output are false positives. The verifier resolves this with 3 stages:

1. Full-page render → connected components (large components = gridlines/vector art, filtered)
2. Component centroid assignment to char bboxes
3. For candidate pairs: 600dpi local re-render → min ink distance (separated if > 0.05pt)

Overlap prevention is built into gen_figure.py (auto 45° x-label rotation for dense bars, hbar y-label shrink for >12 categories, _ensure_ylabel_clear() labelpad auto-increase). If the verifier ever reports 真实重叠>0, the figure is genuinely broken — fix the mechanism, do not special-case the figure.

Quality gates are testable

The repo ships regression suites so gates can be re-verified after any change:

python3 tests/run_tests.py          # 50 unittest tests — all must pass
# evals/evals.json: 8 behavioral evals (exit codes, CJK auto-load, presets, legend audit…)

Supplementary Legends (v2.0)

Journals that forbid in-figure legends (e.g. Nature) need a separate legend block. gen_legend.py renders a journal-format legend ("Figure 1 | title…") from the SAME data JSON used for the figure, so legend text always matches series/colors:

python3 scripts/gen_legend.py -d data.json -t "Response to treatment" -f 1 -o legend.txt
# -d/--data: same JSON as gen_figure.py   -t/--title: legend title
# -f/--figure: figure number (default 1)  --type: chart type (default bar)
# --error-type: error-bar description (default "s.e.m.")   -o: output (default stdout)

CJK / Chinese Support

Pass --cjk to auto-detect and load system CJK fonts. Zero manual configuration needed.

python3 scripts/gen_figure.py -t bar -d data.json -o fig.png --cjk

Font detection priority: Noto Sans CJK → PingFang → Microsoft YaHei → WQY → AR PL → Droid.

For custom font: --cjk-font /path/to/font.ttf

CJK auto-detection is recursive (v1.6.2+): _scan_cjk() walks the entire data dict — values and keys (v2.0), including nested composite panels and diagram text — so a Chinese series name like "对照组" triggers font loading on its own. CJK detection covers supplementary planes (Ext-B..F U+20000–U+2EBEF, Ext-G U+30000–U+3134F) in addition to the basic BMP block (v2.0).

Output Formats

Tip: Nature and Science prefer PDF/EPS vector for line art. Use .pdf or .eps extension.

DPI Standards (2026)

Data Input

JSON (full features) or CSV (basic). See references/data-formats.md for complete schema per chart type.

JSON bar chart example:

{
  "labels": ["Group A", "Group B"],
  "series": {"Treatment": [75, 82], "Control": [68, 70]},
  "errors": {"Treatment": [3, 2], "Control": [2, 1]},
  "significance": {"Treatment:0": "***", "Control:1": "NS"}
}

Key Flags

FAQ (v2.0.1)

1. ModuleNotFoundError on first run? Run python3 scripts/setup_env.py — installs deps (matplotlib/numpy/pymupdf/scipy), detects a CJK font, clears the font cache, and self-checks.
2. Chinese renders as boxes/tofu? Usually a font-cache issue: run python3 scripts/setup_env.py (auto-clears cache), or delete ~/.cache/matplotlib manually and retry. A CJK font must be installed (Linux: fonts-noto-cjk; macOS/Windows ship with one).
3. Does CSV support error bars? No — CSV has only label + value columns. Error bars/significance need JSON errors/significance fields. The CLI error includes this hint automatically.
4. How do I see all themes quickly? python3 scripts/gen_figure.py --list-themes (in-terminal color swatches) or --theme-swatch glm -o swatch.png for a preview PNG.
5. Can't remember theme names? Aliases: okabe/colorblind→okabe-ito, default/classic→glm; case-insensitive with prefix matching (--theme gla → glm).
6. How to get started fast? python3 scripts/gen_figure.py --demo --cjk — interactive menu, renders with built-in data; --explain shows that type's limitations and recommended usage.

Edge Cases (v2.0, learned from regression tests)

1. Box/Violin labels = group names. labels is validated against the number of series/groups, not the number of values. {"labels": ["A","B"], "series": [[..],[..]]} is correct; a per-value label list will fail validation.
2. ROC AUC bounds are checked per curve. curves[].auc must be in [0,1]; the check covers each model curve, not only a top-level auc.
3. Composite legends never double the period. Legend text ends in exactly one . (the _fmt_n formatter already appends a period — no extra one added).
4. CJK in dict keys. A Chinese key in series/groups triggers CJK font loading via key scan; without it the series label renders as tofu boxes in the legend.
5. CJK supplementary planes. Rare CJK ideographs in Ext-B..G blocks (e.g. 㐀, 𠀀) are detected; verify glyph coverage with detect_cjk_font.py before publishing.

Accessibility & Alt Text

When submitting to journals, provide alt text for each figure describing what the figure shows. Example:

"Bar chart showing Treatment group (mean 75, SD 3) vs Control group (mean 68, SD 2). Error bars represent standard deviation. Asterisks indicate statistical significance (p < 0.001)."

Springer Nature, NSF, and most major publishers require alt text for accessibility compliance.

When Agent Generates Figures (Not CLI)

If creating a figure via Python script rather than CLI:

1. Always call detect_cjk_font() first if any label may contain CJK
2. Use fontproperties=font_prop on all text-setting calls with CJK content
3. Set plt.rcParams['axes.unicode_minus'] = False (prevents minus sign boxes)
4. Use Okabe-Ito colors for any multi-category plot
5. Verify output: file size > 20KB for multi-label charts indicates font loaded
6. Preferred output: PDF for submissions, PNG at 600 DPI for previews
7. Hatching preference: User prefers hatched/striped bar patterns (--hatch) for print-friendliness and visual distinction between series. Hatch lines are black (edgecolor='black'). Do NOT manually override edgecolor when hatching is active — the gen_bar function handles it.
8. White background mandatory: This is a publication-quality figure generator for journal submissions. ALL output must use white background (facecolor='white'). Dark/black backgrounds are NEVER acceptable. Do not add dark themes or dark background options.
9. Validation: run validate_data(data, chart_type) and check for fatal messages before rendering (same gates as the CLI).
10. Verify: run verify_overlap_pixel.py on any PDF before delivery.

Design Principles

1. White background is non-negotiable. This skill exists for journal submissions (Nature, Lancet, Science). save_kwargs["facecolor"] is hardcoded to 'white'. Never add dark theme support.
2. Hatching = black lines on colored fill. When --hatch is active, hatch lines are black (edgecolor='black'), guaranteeing visibility on any fill color without dark backgrounds. Each series cycles a distinct pattern for black-and-white print.
3. glm is the default; okabe-ito for submissions. Default theme is glm (muted, colorblind-safe). Always recommend --theme okabe-ito for journal submission colorblind safety. cool is suitable for all-cool-toned content.

CJK Pitfalls

1. Unicode superscripts/subscripts may be missing from CJK fonts. Characters like ⁹ (U+2079), ³ (U+00B3), ² (U+00B2) often produce "Glyph X missing" warnings with Noto Sans CJK. Use plain-text alternatives: 10^9/L instead of ×10⁹/L. Check detect_cjk_font.py output for glyph coverage before publishing.
2. Chinese lab report PDFs from hospital LIS systems produce non-standard text layouts. page.find_tables() typically returns 0 tables. page.get_text() yields column-mixed text (header rows interleaved with data rows) rather than row-aligned output. A 6-line-per-item sequential parser will fail. The reliable approach is: extract full text blob → apply indicator-specific regex patterns (see references/chinese-lab-report-extraction.md).

Diagram (Flow Chart) Pitfalls

1. Never use #FFFFFF for block colors — white blocks are invisible on the mandatory white background. Use the theme palette or any visible hex color.
2. Don't place intermediate blocks between two connected blocks on the same axis — the arrow routing algorithm picks the nearest edge based on center coordinates. A block wedged between two vertically-connected blocks will cause arrows to connect to the wrong block. Instead, merge side-info into the target block's sublabel.
3. CONSORT-style exclusion boxes should be horizontally offset (same Y, different X) from the main vertical flow, with a horizontal arrow connecting them.

Negative Triggers (DO NOT trigger this skill for)

• SVG medical diagrams (→ medical-svg)
• Terminal/CLI charts (→ data-viz)
• Spectrogram/time-frequency (→ pywayne-plot)
• HTML slide presentations (→ html-presentation-restyler)
• Pure data analysis without visualization (→ data-analysis)

File Structure

academic-figures/
├── SKILL.md                 ← English documentation (this file)
├── SKILL_ZH.md              ← Chinese documentation
├── scripts/
│   ├── gen_figure.py        ← Main generator (matplotlib+numpy)
│   ├── gen_legend.py        ← Supplementary legend generator (journal format, v2.0)
│   ├── audit_pdf.py         ← Font-size auditor (--min-size gate, v2.0)
│   ├── detect_cjk_font.py   ← CJK font auto-detector
│   ├── verify_overlap_pixel.py ← Pixel-level label overlap verifier (run on every PDF)
│   └── extract_lab_pdf.py   ← Chinese hospital lab report PDF → JSON extractor
├── tests/
│   └── run_tests.py         ← 50 unittest regression tests (v2.0)
├── evals/
│   └── evals.json           ← 8 behavioral evals (exit codes, CJK, presets, v2.0)
└── references/
    ├── data-formats.md      ← JSON/CSV schema per chart type
    ├── pitfalls.md          ← Common errors and white-bg rule
    ├── reverse-engineering-colors.md  ← Extract exact colors from reference images
    └── chinese-lab-report-extraction.md ← Technique: parsing non-standard LIS PDFs

Version History

• v2.0.1 (2026-08-13) — UX improvements (targeting SkillHub official review T5.0/R4.5/A4.4/C4.8/E4.6 gaps):
  • Default theme changed to glm (muted Morandi, colorblind-safe; old default renamed classic, kept for compatibility).
  • New: --list-themes (in-terminal color swatches), --theme-swatch -o out.png, --style glm-hatch (GLM signature style one-liner), --demo (interactive menu, 12 built-in sample datasets), --explain (limitations/notes), theme aliases + case/prefix tolerance (okabe/colorblind/glm-blog/default→glm).
  • --hatch extended to stacked_bar and forest (overall diamond).
  • Heatmap default colormap fix: when --cmap is omitted the default is now RdBu_r (red-blue diverging) — previously the kwargs default silently fell through to matplotlib's viridis (yellow-green); explicit --cmap still overrides.
  • Data-driven heatmap colormap (added): all-positive data now auto-switches to warm YlOrRd sequential (removes the "broken band" look from RdBu_r's white midpoint on low positive cells); diverging RdBu_r only for data with negatives; vmin/vmax follow data range. Regression tests ×2.
  • Error messages for known limits (e.g., CSV+error bars) now include HINT with the fix.
  • New scripts/setup_env.py: one-command env setup (deps/CJK font/font-cache cleanup/self-check).
  • New examples/: 5 sample data JSONs + 7 theme swatch previews + README.
  • Docs: new FAQ section (font cache/deps/CSV limits/theme cheatsheet).
• v2.0.0 (2026-08-12) — Hardening release: data validation layer, journal presets, verification tooling, regression/evals suites.
  • validate_data(): structural validation across all 18 type/alias branches, called centrally from main(); fatal → ERROR: + exit 1 (no output), warning → WARNING: (accepted). Examples: empty series, length-mismatched series, box/violin labels ≠ group count, missing required keys, ROC curves[].auc outside [0,1].
  • --journal nature|lancet + --column single|double: official column widths (nature 89/183mm, lancet 85/183mm), font size (7/8pt), family (Helvetica/Arial), 600dpi.
  • --verify: in-line pixel-level overlap check on PDF output, exit 2 on real overlaps.
  • scripts/audit_pdf.py: font-size audit with --min-size/--fail-below/--max-reports — journal minimum text gate (nature 5pt, lancet 6pt).
  • scripts/gen_legend.py: journal-format supplementary legends from the same data JSON.
  • legend_audit(): empty-legend detection for Python-API misuse.
  • Bug fixes: box/violin labels validated as group names (series count, not value count); ROC AUC bounds checked per curve; has_cjk() extended to supplementary planes (Ext-B..F U+20000–U+2EBEF, Ext-G U+30000–U+3134F); composite legend double-period removed; _scan_cjk() now scans dict keys too (Chinese series names trigger font loading).
  • tests/run_tests.py: 50 unittest tests (14 chart-type CLI smoke tests + validate_data units + CSV edge cases + CJK + legend audit + PDF audit + legend gen).
  • evals/evals.json: 8 behavioral evals, each validated against real CLI behavior (exit codes, CJK auto-load, nature double=183mm, no-false-warning legend audit, CSV long-format, box group labels, KM legend formatting).
• v1.6.6 (2026-08-12) — Scatter readability fixes: (1) gen_scatter now renders point labels from data["labels"] (one per x/y point, alternating above/below with growing offset so clustered points like years 1950/1953/1955 don't collide); (2) trend line now carries label='Linear trend' so the legend explains the dashed regression line instead of leaving it unlabeled. Rebuilt demo3 with full annotations (title, axis labels, point labels, legend) — verified 0 real overlaps.
• v1.6.5 (2026-08-12) — Documentation: made overlap verification a mandatory step for PDF delivery. Added "Verification" section to SKILL.md/SKILL_ZH.md (3-stage pixel verifier usage + warning that PyMuPDF bbox intersections are line-height-model artifacts, 100% false positives on this generator's output), added verify_overlap_pixel.py to file-structure docs, and added pymupdf/scipy to the requires pip list (verifier dependencies). Demo figures regenerated with real KEGG pathway gene counts (demo2) and ChEMBL pchembl values (demo3) after the previous demo datasets were found to contain degenerate synthetic values (all-50 gene counts / all-4.0 max_phase) that compressed axes into misleading density.
• v1.6.4 (2026-08-12) — Verifier fix: confirm_min_dist now uses unique assignment (a component whose centroid falls in both spans' candidate windows is assigned to the nearer origin) instead of shared assignment, eliminating false positives for rotated y-axis labels (e.g. scatter (max phase) label vs top tick 4.00 — claimed overlap was verifier cross-assignment, not real ink contact). Re-verified all 14 production figures + 4 demo figures: 0 real overlaps. Added _ensure_ylabel_clear() safety net to gen_figure.py (auto-increases y-label labelpad when matplotlib's measured bbox actually collides with tick labels; inert when no conflict, as in all current figures).
• v1.6.3 (2026-08-12) — Label overlap verification closed at pixel level. Root cause of all reported "overlaps": PyMuPDF span/char bboxes use the font line-height model (Noto CJK 2.856em, DejaVu 1.695em), which systematically overestimates rotated text (45°: 32.3pt claimed vs 16.8pt real ink for fs=9) and stacked labels (char row bbox spans full line height). Verified all 14 production figures with a 3-stage pixel verifier (connected components → component centroid ownership → min ink distance at 600dpi): 0 real ink overlaps. matplotlib get_window_extent (20.9pt vs 16.8pt real) is slightly conservative, so the anti-overlap mechanism is correct as-is. Verifier at scripts/verify_overlap_pixel.py. Removed dead math import from gen_figure.py.
• v1.6.2 (2026-08-11) — Fixed two quality issues found in production use. (1) CJK detection is now recursive: _text_has_cjk() scans the entire data dict including nested composite panels/diagram text, so Chinese titles inside composite panels correctly trigger Noto Sans CJK loading (previously they rendered as tofu boxes). (2) Automatic label anti-overlap: x-axis labels rotate 45° when >8 bars or >12-char labels (bar) / >10 points (line) / >6 columns or >14-char labels (heatmap); hbar y-labels shrink one point when >12 categories; composite panels pass alternate through to hbar subplots.
• v1.6.1 (2026-08-07) — Brightened GLM theme yellow from #D49356 to #D79D55 (true mean pixel value of the GLM-5.2 blog chart, sampled from 143k yellow pixels; previous value was an unrepresentatively dark sample). All alternate-style bar charts now render with the brighter warm yellow.
• v1.6.0 (2026-08-07) — Added --alternate flag: GLM-5.2 blog style blue/yellow alternating bars for single-series bar/hbar charts (--theme glm --hatch --alternate reproduces the blog's yellow+black-hatch look: #D79D55 yellow / #70A0D0 blue alternating per bar with black hatch lines). Colors come from the first two theme colors, so it also works with cool/okabe-ito themes.
• v1.5.2 (2026-06-18) — Added cool theme: 8-color cool-toned palette (navy #1B4965, ocean #2E6F9E, sky #4FA3C5, dark teal #3D8080, medium teal #62A0A8, steel #5B7BA0, slate #7B9AB5, pale steel #9DB5CC), all hues in 190-260° range, colorblind-safe. Created in response to user rejecting warm/saturated palettes and requesting 素雅冷色调配色.
• v1.5.1 (2026-06-18) — Bug fixes: gen_km() crashes when median_survival value is null (median not reached); gen_scatter() crashes when groups array length exceeds x/y length (composite panels). Both fixed with null/length guards. Added cool theme (navy/ocean/teal/slate cool-toned palette, colorblind-safe). See references/pitfalls.md.
• v1.5.0 (2026-06-17) — Added 3 new chart types: horizontal bar charts (hbar, with ratio annotations like "4.96x"), multi-panel composite figures (Panel A+B+C with GridSpec, any chart type per panel), architecture/flow diagrams (colored blocks, arrows, groupings, annotations); added GLM theme (muted/dusty palette pixel-extracted from GLM-5.2 blog: #70A0D0 blue + #D79D55 yellow, mean pixel values); added bar hatching with BLACK lines on ALL bars (print-friendly, 9 patterns: //, \\, ||, --, ++, xx, etc.); added --hatch, --show-ratio, --ratio-base, --horizontal CLI flags; white background mandatory for all themes (publication standard); see references/reverse-engineering-colors.md for pixel extraction technique
• v1.4.0 (2026-05-17) — Added 4 new chart types: Kaplan-Meier survival curves (log-rank test, risk tables, median survival, censor marks), ROC curves (AUC, 95% CI, optimal cutoff, multi-model comparison), stacked bar charts (compositional data, percentage labels), dual Y-axis line charts (clinical score + lab marker); expanded data validation for new types
• v1.3.0 (2026-05-17) — Added Okabe-Ito colorblind-safe theme (Nature Methods standard); DPI upgraded 300→600 for line art; added PDF/TIFF/EPS output; enhanced forest plot (weight bubbles, I² heterogeneity, events/total, separator line); accessibility alt-text guidance; smart DPI by content type
• v1.2.0 (2026-05-16) — Added version metadata, requires declaration, negative triggers, file structure docs
• v1.1.0 — Added auto CJK detection, CSV long-format auto-conversion, empty data validation
• v1.0.0 — Initial release: 7 chart types, 4 themes, CJK support, statistical annotations