SKILL.md

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3. Conversion Commands

See conversion script at scripts/convert-drawio-to-png.sh.

# Convert all .drawio files

mise exec -- pre-commit run --all-files

# Convert specific .drawio file

mise exec -- pre-commit run convert-drawio-to-png --files assets/my-diagram.drawio

# Run script directly (using skill's script)

bash ~/.claude/skills/draw-io/scripts/convert-drawio-to-png.sh assets/diagram1.drawio

Internal command used:

drawio -x -f png -s 2 -t -o output.drawio.png input.drawio

Option

Description

-x

Export mode

-f png

PNG format output

-s 2

2x scale (high resolution)

-t

Transparent background

-o

Output file path

4. Layout Adjustment

4.1. Coordinate Adjustment Steps

Open .drawio file in text editor (plain XML format)

Find mxCell for element to adjust (search by value attribute for text)

Adjust coordinates in mxGeometry tag

x: Position from left

y: Position from top

width: Width

height: Height

Run conversion and verify

4.2. Coordinate Calculation

Element center coordinate = y + (height / 2)

To align multiple elements, calculate and match center coordinates

5. Design Principles

5.1. Basic Principles

Clarity: Create simple, visually clean diagrams

Consistency: Unify colors, fonts, icon sizes, line thickness

Accuracy: Do not sacrifice accuracy for simplification

5.2. Element Rules

Label all elements

Use arrows to indicate direction

(prefer 2 unidirectional arrows over bidirectional)

Use latest official icons

Add legend to explain custom symbols

5.3. Accessibility

Ensure sufficient color contrast

Use patterns in addition to colors

5.4. Progressive Disclosure

Separate complex systems into staged diagrams:

Diagram Type

Purpose

Context Diagram

System overview from external perspective

System Diagram

Main components and relationships

Component Diagram

Technical details and integration points

Deployment Diagram

Infrastructure configuration

Data Flow Diagram

Data flow and transformation

Sequence Diagram

Time-series interactions

5.5. Metadata

Include title, description, last updated, author, and version in diagrams.

6. Best Practices

6.1. Background Color

Remove background="#ffffff"

Transparent background adapts to various themes

6.2. Font Size

Use 1.5x standard font size (around 18px) for PDF readability

6.3. Japanese Text Width

Allow 30-40px per character

Insufficient width causes unintended line breaks

<!-- For 10-character text, allow 300-400px -->

<mxGeometry x="140" y="60" width="400" height="40" />

6.4. Arrow Placement

Always place arrows at back (position in XML right after Title)

Position arrows to avoid overlapping with labels

Keep arrow start/end at least 20px from label bottom edge

<!-- Title -->

<mxCell id="title" value="..." .../>

<!-- Arrows (back layer) -->

<mxCell id="arrow1" style="edgeStyle=..." .../>

<!-- Other elements (front layer) -->

<mxCell id="box1" .../>

6.5. Arrow Connection to Text Labels

For text elements, exitX/exitY don't work, so use explicit coordinates:

<!-- Good: Explicit coordinates with sourcePoint/targetPoint -->

<mxCell id="arrow" style="..." edge="1" parent="1">

  <mxGeometry relative="1" as="geometry">

    <mxPoint x="1279" y="500" as="sourcePoint"/>

    <mxPoint x="119" y="500" as="targetPoint"/>

    <Array as="points">

      <mxPoint x="1279" y="560"/>

      <mxPoint x="119" y="560"/>

    </Array>

  </mxGeometry>

</mxCell>

6.6. edgeLabel Offset Adjustment

Adjust offset attribute to distance arrow labels from arrows:

<!-- Place above arrow (negative value to distance) -->

<mxPoint x="0" y="-40" as="offset"/>

<!-- Place below arrow (positive value to distance) -->

<mxPoint x="0" y="40" as="offset"/>

6.7. Remove Unnecessary Elements

Remove decorative icons irrelevant to context

Example: If ECR exists, separate Docker icon is unnecessary

6.8. Labels and Headings

Service name only: 1 line

Service name + supplementary info: 2 lines with line break

Redundant notation (e.g., ECR Container Registry): shorten to 1 line

Use &lt;br&gt; tag for line breaks

6.9. Background Frame and Internal Element Placement

When placing elements inside background frames (grouping boxes),

ensure sufficient margin.

YOU MUST: Internal elements must have at least 30px margin from frame boundary

YOU MUST: Account for rounded corners (rounded=1) and stroke width

YOU MUST: Always visually verify PNG output for overflow

Coordinate calculation verification:

Background frame: y=20, height=400 -> range is y=20-420

Internal element top: frame y + 30 or more (e.g., y=50)

Internal element bottom: frame y + height - 30 or less (e.g., up to y=390)

Bad example (may overflow):

<!-- Background frame -->

<mxCell id="bg" style="rounded=1;strokeWidth=3;...">

  <mxGeometry x="500" y="20" width="560" height="400" />

</mxCell>

<!-- Text: y=30 is too close to frame top (y=20) -->

<mxCell id="label" value="Title" style="text;...">

  <mxGeometry x="510" y="30" width="540" height="35" />

</mxCell>

Good example (sufficient margin):

<!-- Background frame -->

<mxCell id="bg" style="rounded=1;strokeWidth=3;...">

  <mxGeometry x="500" y="20" width="560" height="430" />

</mxCell>

<!-- Text: y=50 is 30px from frame top (y=20) -->

<mxCell id="label" value="Title" style="text;...">

  <mxGeometry x="510" y="50" width="540" height="35" />

</mxCell>

7. Reference

Layout Guidelines

AWS Icons

AWS Icon Search Script

AWS icon search examples:

python ~/.claude/skills/draw-io/scripts/find_aws_icon.py ec2

python ~/.claude/skills/draw-io/scripts/find_aws_icon.py lambda

8. Checklist

No background color set (page="0")

Font size appropriate (larger recommended)

Arrows placed at back layer

Arrows not overlapping labels (verify in PNG)

Arrow start/end sufficiently distant from labels (at least 20px)

Arrows not penetrating boxes or icons (verify in PNG)

Internal elements not overflowing background frame (verify in PNG)

30px+ margin between background frame and internal elements

AWS service names are official names/correct abbreviations

AWS icons are latest version (mxgraph.aws4.*)

No unnecessary elements remaining

Visually verified PNG conversion

9. Image Display in reveal.js Slides

Add auto-stretch: false to YAML header:

---

title: "Your Presentation"

format:

  revealjs:

    auto-stretch: false

---

This ensures correct image display on mobile devices.

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