Drawlib

Pure-Python Library for "Illustration as Code" & "Illustrated Documentation as Code"

Drawlib is a declarative Python drawing library and integrated documentation compiler designed for software engineers and autonomous AI coding agents. Instead of maintaining brittle diagrams in external GUI tools (draw.io, Visio, PowerPoint) and manually pasting exported images into wikis, Drawlib lets you author, version-control, and build architectural diagrams, data charts, technical documents, and presentation slide decks entirely from code in Git.

• Official Website & Documentation: https://www.drawlib.com/
• Repository Guides & Whitepapers:
  • Quickstart Guide (PDF)
  • 16:9 Presentation Slide Deck (PDF)
  • Dogfooding Whitepaper — English (PDF) | 日本語版 (PDF)

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Why Drawlib v0.3?

1. Cloud & Software Engineering Diagrams

Stop assembling complex architectures out of raw coordinates. Drawlib provides high-level diagramming engines (drawlib.diagrams, drawlib.graph) and standardized icon sets (drawlib.icons.gcp, phosphor, fontawesome):

• Auto-Layout Graphs (drawlib.graph): Declarative graph layout solvers (ArchitectureGraph, LayerGraph, TreeGraph, RadialGraph, GridGraph) that compute overlap-free coordinates (get_layout()), nested cluster bounds, and offset() fine-tuning for rendering with drawlib.diagrams and drawlib.shapes.
• Technical Diagrams (drawlib.diagrams):
  • Cloud Architecture (ArchitectureDiagram): VPC boundaries, subnets, tiers, and official cloud service icons.
  • Flowcharts (FlowDiagram): Process stages, decision branches, and orthogonal connectors.
  • Sequence Diagrams (SequenceDiagram): Client/server lifelines, synchronous/asynchronous messages, and activation bars.
  • UML Class, ER & State Diagrams (ClassDiagram, ERDiagram, StateDiagram): Object-oriented models, database schemas, and state machines.

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2. Quantitative Charts & SmartArt Infographics

Compose presentation-ready infographics (drawlib.smartarts) and quantitative data plots (drawlib.charts) side by side on the same canvas:

• SmartArts (drawlib.smartarts): ChevronProcess, Cycle, Table, TreeNode, MindMapNode, Pyramid, BoxList, BulletPoints, GridLayout, and syntax-highlighted SourceCode.
• Charts (drawlib.charts): Pure-Python BarChart, LineChart, AreaChart, PieChart, RadarChart, ScatterChart, GanttChart, and HeatmapChart / HeatmapOverlay styled with the same design tokens as your diagrams.

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3. Rich Primitives & Semantic Design System

At its foundation, Drawlib separates Content (geometry, coordinates, structure) from Style (colors, typography, borders, themes)—just like HTML and CSS:

• 5 Core Primitive Categories:
  • Icons (drawlib.icons): 1,500+ Phosphor icons (5 weights), FontAwesome, and official Google Cloud (GCP) icons.
  • Images (drawlib.images): Non-destructive Dimage processing pipeline (sepia(), grayscale(), mosaic(), mirror(), crop(), borders, rotation).
  • Lines (drawlib.lines): Straight, curved (bend), quadratic/cubic Bezier, and rounded multi-point polylines with customizable arrowheads ("->", "<-", "<->").
  • Shapes (drawlib.shapes): 23 geometric primitives (rectangle, circle, ellipse, rhombus, star, arrow, chevron, bubblespeech, polygon, etc.).
  • Text (drawlib.text, drawlib.fonts): Multilingual typography with automatic on-demand font caching (FontRoboto, FontSansSerif, FontSerif, FontSourceCode, FontJapanese, FontChinese, FontKorean, FontArabic, etc.).
• 7-Role Semantic Style System (drawlib.styles):
  • Built-in presets (default, google, essentials, monochrome, warm, cold) accessed via Styles.<Token> (Styles.PrimaryFlat, Styles.Neutral, Styles.SecondaryNeutral, Styles.MutedDashed, Styles.SuccessNeutral, Styles.WarningNeutral, Styles.DangerNeutral).

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4. Illustrated Documentation & Slide as Code

Write Markdown files with embedded ```drawlib code blocks. A single drawlib build command compiles your repository into multiple publication formats:

• 4 Project Scaffolds (drawlib init <type>):
  • drawlib init site: Multi-page documentation website (docs_html/), GitHub Markdown (docs/), and PDF.
  • drawlib init doc: Linear technical specification / whitepaper (*_html/, *_markdown/, *.pdf).
  • drawlib init slide: 16:9 presentation slide deck with native SVG text and keyboard navigation (slide_html/, slide.pdf).
  • drawlib init images: Standalone batch Python illustration scripts (images_src/ -> images/).

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5. AI Inner Loop & Human Outer Loop

Drawlib is engineered from the ground up for AI-native documentation and diagram engineering (Claude Code, Cursor, Gemini, Codex), separating high-frequency visual self-correction from high-level human review:

• AI Inner Loop (Autonomous Visual Self-Correction):
  1. On-Demand Spec & Codebase Lookup: The AI agent autonomously queries drawlib rules show <topic> for detailed API specifications and design best practices, while directly inspecting repository source code, schemas, and design docs as the single source of truth.
  2. Code Synthesis & Grid Preview (drawlib show -g): The agent writes Python drawing blocks and Markdown prose, then renders a headless preview with a coordinate grid overlay.
  3. Multimodal Inspection & Self-Repair: The agent visually inspects the rendered PNG for text clipping, overlapping labels, or style imbalances, repairing coordinates and styles autonomously until the diagram passes inspection.
• Human Outer Loop (Intent & Review):
  • The developer stays focused on high-level architecture and intent—providing initial goals, reviewing the compiled Published Docs (HTML / PDF / GitHub MD / Slide), and iterating on direction without ever nudging pixels in a GUI tool.

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Installation

Install drawlib from PyPI using pip or uv:

pip install drawlib

To enable headless PDF export for documentation sites, linear documents, and slide decks, install the [pdf] extra and Chromium:

pip install "drawlib[pdf]"
playwright install chromium

Verify the installation:

drawlib --version

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Quick Start

1. Standalone Python Script

Create a file named architecture.py:

from drawlib.canvas import save, setup
from drawlib.lines import line
from drawlib.shapes import rectangle
from drawlib.styles import Styles
from drawlib.text import text

setup(width=120, height=50)

# 1. Structural Boundary (Muted)
rectangle((60, 25), width=112, height=42, r=3, style=Styles.MutedDashed)
text((22, 42.5), "Production VPC", style=Styles.MutedBold.patch(text_size=9))

# 2. Entrypoint & Hero Service
rectangle((22, 24), width=24, height=16, r=2, style=Styles.Neutral, text="Client App")
rectangle(
    (58, 24),
    width=26,
    height=16,
    r=2,
    style=Styles.PrimaryFlat,
    text="API Gateway",
    text_style=Styles.WhiteBold,
)

# 3. Downstream Services (Tinted Neutral Cards)
rectangle((96, 33), width=24, height=12, r=2, style=Styles.SecondaryNeutral, text="Auth Service")
rectangle((96, 15), width=24, height=12, r=2, style=Styles.SuccessNeutral, text="Audit Log DB")

# 4. Directional Connectors
line((34, 24), (45, 24), arrow_head="->", style=Styles.DarkBold)
line((71, 28), (84, 33), arrow_head="->", style=Styles.DarkBold)
line((71, 20), (84, 15), arrow_head="->", style=Styles.DarkBold)

save()

Run the script with Python or drawlib to generate architecture.png:

python architecture.py

Core Principles at a Glance

• Bottom-Left Origin (0, 0): setup(width=120, height=50) defines a Cartesian coordinate canvas where x spans 0..120 (left to right) and y spans 0..50 (bottom to top).
• Center Alignment by Default: Shapes (rectangle, circle, icon, image, text) are positioned by their center (x, y), making horizontal and vertical alignment effortless.
• 50%+ Neutral Baseline: Ground supporting nodes in calm neutral styles (Styles.Neutral, Styles.SecondaryNeutral, Styles.SuccessNeutral) and reserve saturated fills (Styles.PrimaryFlat) for primary focal points.
• Style Patching (.patch()): Customize any preset token non-destructively via Styles.MutedBold.patch(text_size=9) or Styles.Primary.patch(shape_line_width=2).

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2. Illustrated Documentation & Slide Deck Workflow

Scaffold a new documentation website, technical spec, or 16:9 slide deck in seconds:

# Initialize a multi-page documentation site in docs_src/
drawlib init site

# Or initialize a 16:9 presentation slide deck in slide_src/
drawlib init slide

Inside your Markdown files (docs_src/index.md), embed Python drawing blocks using the ```drawlib fence:

# System Architecture

Below is our core request routing pipeline:

```drawlib 600px center file:service_routing.png caption:"Service Routing Pipeline"
from drawlib.canvas import setup
from drawlib.shapes import rectangle
from drawlib.lines import line
from drawlib.styles import Styles

setup(width=100, height=40)
rectangle((25, 20), width=30, height=16, r=2, style=Styles.Neutral, text="Ingress")
rectangle((75, 20), width=30, height=16, r=2, style=Styles.PrimaryFlat, text="Core API", text_style=Styles.WhiteBold)
line((40, 20), (60, 20), arrow_head="->", style=Styles.DarkBold)
```

Compile or preview with the drawlib CLI:

# Build HTML site, GitHub Markdown, or PDF
./docs_src/build.sh

# Launch local HTTP server with broken-link check at http://localhost:8000
drawlib serve docs_html/

# Render a single diagram with coordinate grid (-g) for layout inspection
drawlib show docs_src/index.md service_routing.png -g -o preview_grid.png

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3. CLI Reference Summary

Command	Description
drawlib init <site|doc|slide|images>	Scaffold a new documentation, slide deck, or image project
drawlib build <html|markdown|pdf|image>	Compile source files into HTML, Markdown, PDF, or PNG/WebP images
drawlib serve <html_dir> [--check]	Start a local HTTP server for built HTML docs/slides with pre-flight link checks
drawlib show <file> [target] [-g]	Render and inspect a single script or embedded Markdown diagram (with optional grid)
drawlib rules show [topic]	On-demand CLI reference for AI agents to look up detailed API specs & best practices (overview, style-guide, api, lib-*)
drawlib cache <list|download|clear>	Manage local font and icon asset caches (supports offline pre-caching via --all)

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Links & Resources

• Official Website & Documentation: https://www.drawlib.com/
• PyPI Package: https://pypi.org/project/drawlib/
• GitHub Repository: https://github.com/yuichi110/drawlib
• License: Apache License 2.0