CrystaLit VizMaker

Figure width: 8-12 cm. Single-column figures at 8-9 cm, double-column at 10-12 cm. Set width explicitly in the script; do not rely on matplotlib defaults.

Font size: Minimum 8pt for any text element. Axis labels, tick labels, legends, annotations all must be readable at print size. When in doubt, increase the font size.

Font family: Sans-serif (Arial, Helvetica, or DejaVu Sans). Consistent across all figures.

Color: Use colorblind-friendly palettes (viridis, cividis, or custom palettes with sufficient contrast). Avoid red-green distinctions as the sole differentiator.

Layout: bbox_inches='tight' in savefig() only, not in rcParams (this causes width expansion). Use pad_inches=0.02 for minimal whitespace.

Style: Clean, minimal, Nature/Lancet aesthetic. No unnecessary gridlines, no 3D effects, no decorative elements.

The Figure Library

Generate at least 10 figure types, each with 2-3 variations (subpanels a, b, c). The specific figures depend on the ontology structure, but a typical set includes:

Core Figure Types

1. Bar charts (horizontal) — Concept frequency within a subtheme (e.g., algorithm distribution, anatomy distribution)
2. Stacked bar charts — Multi-category breakdowns (e.g., algorithm type by year period)
3. Heatmaps — Co-occurrence matrices (e.g., which algorithms are used with which anatomies)
4. Treemaps — Hierarchical theme composition (theme → subtheme, sized by concept count)
5. Network graphs — Concept co-occurrence networks (e.g., which anatomical structures appear together)
6. Timeline/scatter — Publication year vs. method evolution
7. Radar/spider charts — Multi-dimensional paper profiles
8. Grouped bar charts — Comparisons across themes or time periods
9. Bubble charts — Three-variable displays (x, y, size)
10. Sankey/alluvial — Flow between categories (e.g., modality → algorithm → clinical application)

Handling Text in Figures

Text truncation and label overlap are the most common quality problems. Address them proactively:

Abbreviation strategy: Build an abbreviation lookup table (ABBREV_MAP) that maps long concept names to short, standard abbreviations used in the field. Apply this before rendering. For medical imaging: CT_Pulmonary_Angiography_CTPA → CTPA, Left_Ventricle → LV, Statistical_Shape_Model_SSM → SSM.

Label placement: For bar charts, use horizontal bars (labels on the y-axis read naturally). For network graphs, use circular layouts with labels placed outside the node circle. For treemaps, only label cells above a minimum size threshold.

Fallback truncation: After abbreviation, if a label is still too long, truncate at a configurable maxlen parameter (default 20 characters) with ellipsis.

The Generation Script

Write a single generate_figures.py that:

1. Loads all_papers.json and the YAML ontology
2. Defines all constants at the top (DPI, figure widths, font sizes, color palettes, abbreviation map)
3. Has one function per figure that creates, formats, and returns the figure
4. Has a save_fig(fig, name) function that saves both PDF and PNG:

def save_fig(fig, name):
    base, _ = os.path.splitext(name)
    pdf_path = os.path.join(SCRIPT_DIR, base + '.pdf')
    png_path = os.path.join(SCRIPT_DIR, base + '.png')
    fig.savefig(pdf_path, format='pdf', bbox_inches='tight', pad_inches=0.02)
    fig.savefig(png_path, format='png', bbox_inches='tight', pad_inches=0.02, dpi=DPI)
    plt.close(fig)

5. Has a main() function that generates all figures sequentially with progress output
6. Is fully reproducible: running it twice produces identical figures

The Dashboard

Create an interactive HTML dashboard that embeds the data directly (no external dependencies or server required). The dashboard should allow filtering by theme, subtheme, and individual papers, show the same visualizations as the static figures but with interactivity (hover details, click to filter), and work by opening the HTML file directly in a browser.

Use a lightweight library like Chart.js, Plotly.js, or D3.js loaded from CDN. Embed the data as a JSON variable within the HTML file.

Quality Assurance Process

After generating all figures, run a QA pass:

1. View every figure at actual print size (100% zoom on screen ≈ print size for 300 DPI)
2. Check for: truncated labels, overlapping text, illegible fonts, broken layouts, empty figures, color issues
3. Fix and regenerate any figures that fail QA
4. Iterate until all figures pass

The orchestrator's HITL checkpoint for Phase 4 includes showing all figures to the user. Expect 2-3 rounds of iteration based on user feedback.

Common Libraries

import matplotlib.pyplot as plt
import matplotlib
import seaborn as sns
import squarify          # treemaps
import networkx as nx    # network graphs
import numpy as np
import json, yaml, os

Install these before running: pip install matplotlib seaborn squarify networkx pyyaml

What to Hand Off

The figures directory (PDFs + PNGs), the generation script, and the dashboard go to the user for review at the HITL checkpoint. The figures also feed into Phase 5 (crystalit-writer) where they are referenced in the literature review report.