GCP DrawIO Diagram Generator

Generates professional DrawIO XML diagrams for Google Cloud Platform architectures.

Capabilities

1. Extract - Analyze existing DrawIO XML files to identify GCP shapes, connections, and structure
2. Identify - Recognize GCP service icons from architecture diagram images
3. Generate - Create valid DrawIO XML from images or text descriptions
4. Convert - Transform GCP architecture diagrams into editable DrawIO format

Quick Reference

GCP Shape Pattern

shape=mxgraph.gcp2.{service_name}

Note: GCP uses snake_case for shape names (e.g.,

cloud_run

cloud_sql

cloud_storage

Icon Pattern: Unlike AWS, GCP uses a single icon pattern for all services — there is no service vs instance icon distinction. The same

shape=mxgraph.gcp2.{name}

Common GCP Services

mxgraph.gcp2.cloud_run

mxgraph.gcp2.bigquery

mxgraph.gcp2.cloud_storage

mxgraph.gcp2.cloud_machine_learning

mxgraph.gcp2.cloud_scheduler

mxgraph.gcp2.apigee_api_platform

mxgraph.gcp2.cloud_pubsub

mxgraph.gcp2.cloud_sql

mxgraph.gcp2.compute_engine

mxgraph.gcp2.cloud_functions

GCP Container Types

Task 1: Analyze a DrawIO File

Use this workflow to extract and document all components from an existing DrawIO file.

Steps

1. Read the file - Load the

   .drawio

   XML file
2. Parse structure - Extract all

   <mxCell>

   elements
3. Identify shapes - Find cells with

   vertex="1"

4. Identify connections - Find cells with

   edge="1"

5. Extract styles - Parse style strings for each element
6. Map hierarchy - Build container/child relationships using

   parent

   attribute
7. Generate report - Output findings in structured format

Input

• Path to

  .drawio

  file

Output

Generate a Markdown report with:

# DrawIO Analysis Report

## Summary
- Total shapes: X
- Total connections: Y
- Containers: Z

## Shape Inventory

| ID | Label | Type | Position | Parent |
|----|-------|------|----------|--------|
| abc | Cloud Run | mxgraph.gcp2.cloud_run | (100,200) | vpc1 |

## Connection Matrix

| From | To | Label | Type |
|------|-----|-------|------|
| Cloud Run | BigQuery | API | solid |

## Container Hierarchy

- VPC-SC (vpc1)
  - Cloud Run (run1)
  - Cloud Run (run2)
  - BigQuery (bq1)

## Style Analysis

### Unique Shapes Found
- mxgraph.gcp2.cloud_run (4 instances)
- mxgraph.gcp2.bigquery (2 instances)

Task 2: Convert Image to DrawIO

Use this workflow to recreate a GCP architecture diagram from an image.

Steps

1. Analyze image - Identify all visual elements:

   • GCP service icons (shape, color, label)
   • Containers/boundaries (color, border style)
   • Connections (solid, dashed, arrows)
   • Labels and text

2. Map to library - For each identified element:

   • Look up in

     assets/gcp-icons.json

     by visual signature or label
   • Match containers to

     assets/containers.json

   • Note any unrecognized elements

3. Estimate layout - Determine positions:

   • Identify container boundaries first
   • Place icons within containers
   • Estimate x,y coordinates and dimensions
   • Standard icon size: 50x50 pixels

4. Generate XML - Build the DrawIO structure:

   • Start with base template from

     assets/templates/drawio-base.xml

   • Add containers first (they become parents)
   • Add service icons with correct parent references
   • Add connections between shapes

5. Create confidence report - Document accuracy:

   • List all identified components
   • Note any uncertain matches
   • Flag potential issues

Input

• GCP architecture diagram image (PNG/JPG)

Output

1. Valid

   .drawio

   XML file
2. Confidence report (Markdown)

Confidence Report Format

# Conversion Confidence Report

## Overall Confidence: 85%

## Identified Components

### High Confidence (>90%)
- Cloud Run x4 - Clear icon match
- BigQuery x2 - Clear icon match
- VPC-SC container - Green border, correct label

### Medium Confidence (70-90%)
- Vertex AI Search - Icon similar, label confirms

### Low Confidence (<70%)
- Unknown icon at position (300, 400) - Mapped to generic service

## Connection Accuracy
- 12/14 connections clearly visible
- 2 connections inferred from layout

## Notes
- "Same Instance" dashed container identified
- Bidirectional arrows on 3 connections

Task 3: Create DrawIO from Description

Use this workflow to generate a new GCP diagram from text specifications.

Steps

1. Parse requirements - Extract from description:

   • Required GCP services
   • Container/grouping needs
   • Connection requirements
   • Layout preferences

2. Select components - From libraries:

   • Look up services in

     assets/gcp-icons.json

   • Choose containers from

     assets/containers.json

   • Select connection styles

3. Plan layout - Design the arrangement:

   • Determine canvas size
   • Position containers first
   • Arrange services logically (left-to-right data flow, top-to-bottom hierarchy)
   • Standard spacing: 100px between 50x50 icons

4. Generate XML - Build the diagram:

   • Use

     assets/templates/drawio-base.xml

     as starting point
   • Add elements in order: containers, services, connections
   • Assign unique IDs to all elements

5. Validate - Check the output:

   • All requested components present
   • Connections reference valid IDs
   • Layout is logical and readable

Input

• Text description of desired GCP architecture

Output

• Valid

  .drawio

  XML file

Example Input

Create a GCP architecture with:
- VPC-SC container
- Cloud Scheduler triggering Cloud Run
- Cloud Run connecting to BigQuery and Cloud Storage
- Vertex AI Search connected to BigQuery

Example Output Structure

<mxfile ...>
  <diagram name="GCP Architecture">
    <mxGraphModel ...>
      <root>
        <mxCell id="0" />
        <mxCell id="1" parent="0" />
        <!-- VPC-SC Container -->
        <mxCell id="vpc" value="VPC-SC" style="..." vertex="1" parent="1">
          <mxGeometry x="50" y="50" width="700" height="400" />
        </mxCell>
        <!-- Cloud Scheduler -->
        <mxCell id="sched" value="Cloud Scheduler" style="...mxgraph.gcp2.cloud_scheduler" vertex="1" parent="vpc">
          <mxGeometry x="50" y="100" width="50" height="50" />
        </mxCell>
        <!-- More shapes... -->
        <!-- Connections -->
        <mxCell id="conn1" edge="1" source="sched" target="run" style="..." />
      </root>
    </mxGraphModel>
  </diagram>
</mxfile>

Shape Library Reference

Looking Up a GCP Service

1. Open

   assets/gcp-icons.json

2. Search by

   service_name

   or

   recognition_keywords

3. Use the

   drawio_shape.full_style

   for complete styling
4. Or construct style using

   shape=mxgraph.gcp2.{shape_name}

Service Coverage:

• 46 GCP services across 11 categories
• 40 exact matches, 6 fallback icons
• Categories: compute, database, storage, networking, ai_ml, integration, operations, api_management, data_analytics, devops, security

Note: 6 services use fallback icons (Workflows, Eventarc, Artifact Registry, Cloud Deploy, Secret Manager, Identity Platform) as they're newer services not yet in DrawIO's mxgraph.gcp2 stencil. See references/ICON-COMPATIBILITY.md for complete validation details.

GCP Service Categories

Visual Best Practices (Summary)

For detailed visual design guidelines, see references/DIAGRAM-BEST-PRACTICES.md.

GCP Project Zone (Two-Cell Pattern)

The GCP Project container uses two cells, not one:

1. Container cell: Plain rectangle with

   fillColor=#F6F6F6;strokeColor=none;

   and HTML value

   <b>Google </b>Cloud Platform

2. Logo child cell:

   shape=mxgraph.gcp2.google_cloud_platform

   at 23x20px with

   relative=1

   geometry

See

assets/templates/node-template.xml

Font Colors

• Service icon labels:

  fontColor=#424242

  (dark gray)
• GCP Project zone text:

  fontColor=#717171

• VPC-SC container title:

  fontColor=#2E7D32

  (dark green)
• Dashed group labels:

  fontColor=#424242

Icon Spacing

• Icon size: 50x50 pixels
• Standard spacing: 100px between icons
• Container padding: 20-30px

Connection Labels

Always add these properties to labeled connections:

labelBackgroundColor=#FFFFFF;fontSize=10;fontColor=#333333;

Connection Best Practices

• Standard width:

  strokeWidth=1

  for most connections
• Thick width:

  strokeWidth=2

  only for primary data paths (use sparingly - max 1-3 per diagram)
• Orthogonal routing:

  edgeStyle=orthogonalEdgeStyle

  for professional appearance
• When 3+ connections cross same corridor: consolidate into single connection

XML Structure Quick Reference

For complete XML examples and detailed structure, see references/xml-examples.md.

The key building blocks:

• Shape:

  <mxCell id="..." value="Label" style="..." vertex="1" parent="1">

  with

  <mxGeometry>

• Connection:

  <mxCell id="..." edge="1" source="..." target="..." style="...">

• Container: Shape with

  container=1

  in style; children set

  parent

  to container ID
• Root cells: Every diagram needs

  <mxCell id="0"/>

  and

  <mxCell id="1" parent="0"/>

For XML parsing and extraction techniques, see references/xml-parser-guide.md.

Troubleshooting

Icon Not Displaying

• Verify shape name matches exactly:

  mxgraph.gcp2.cloud_run

  (underscore, not hyphen)
• Check references/ICON-COMPATIBILITY.md for correct shape names
• Ensure

  vertex="1"

  is present
• Check that

  <mxGeometry>

  has valid width/height (50x50)
• For Workflows/Eventarc, note these don't have exact icon matches in DrawIO's library

Connection Not Rendering

• Verify source and target IDs exist
• Ensure

  edge="1"

  is set
• Check that source/target shapes are vertices

Shapes Not Inside Container

• Set child's

  parent

  attribute to container's ID
• Ensure container has

  container=1

  in style
• Position child coordinates relative to container (not absolute)

Label Not Showing

• Check

  value

  attribute is set
• Verify

  fontSize

  is reasonable (11-14)
• Ensure

  fontColor=#424242

  is set

File Won't Open in DrawIO

• Validate XML structure (proper closing tags)
• Ensure

  id="0"

  and

  id="1"

  root cells exist
• Check for special characters in labels (use

  


  for newlines)

Desktop Integration

After generating a

.drawio

1. Validate:

   python scripts/validate-drawio.py output.drawio --verbose

2. Analyze:

   python scripts/analyze-existing.py output.drawio --markdown

3. Validate Icons:

   python scripts/validate-gcp-icons.py

4. Export PNG:

   ./scripts/export-diagram.sh output.drawio png

5. Open in DrawIO:

   ./scripts/open-diagram.sh output.drawio

Requires DrawIO Desktop. Install on macOS:

brew install drawio

Files in This Skill

SKILL.md

assets/gcp-icons.json

assets/containers.json

assets/templates/drawio-base.xml

assets/templates/node-template.xml

assets/templates/connection-template.xml

references/ICON-COMPATIBILITY.md

references/DIAGRAM-BEST-PRACTICES.md

references/xml-parser-guide.md

references/xml-examples.md

references/coordinate-system.md

references/style-guide.md

scripts/validate-drawio.py

scripts/validate-gcp-icons.py

scripts/fix-gcp-icons.py

scripts/fix-drawio-icons.py

scripts/extract-shape-names.py

scripts/analyze-existing.py

scripts/export-diagram.sh

scripts/open-diagram.sh