Show HN: Visual Architecture Diagram Builder in Angular with 47+ Components

samba siva — Fri, 05 Dec 2025 17:58:03 +0000

TL;DR

Created an open-source Angular component for building architecture diagrams:

✅ 47+ pre-built components (AWS, Azure, AI/ML tools)
✅ Drag-and-drop interface
✅ Smart grouping and connections
✅ Export to PNG/JSON
✅ Keyboard shortcuts

Try it: Live Demo

Install: npm install konva-architecture-canvas

Why I Built This

I was tired of:

Opening Draw.io for every architecture diagram
Searching for cloud service icons
Recreating the same components repeatedly
Losing work when browser crashes

So I built a tool that:

Integrates with Angular projects
Has built-in cloud & AI/ML components
Auto-saves everything
Works offline

Features

🎯 47+ Ready-to-Use Components

AI Models

GPT-4, Claude, Llama, Gemini, Mistral, Cohere, etc.

Vector Databases

Pinecone, Weaviate, Milvus, Chroma, pgVector, Neon

Agent Frameworks

LangChain, AutoGen, CrewAI, LlamaIndex, Semantic Kernel

Observability

Langfuse, Comet Opik, DataDog, Grafana, Arize Phoenix

And more: Tool execution, memory systems, cloud services

🎨 Professional Drawing Tools

Basic shapes (rectangle, circle, arrow, line)
Text annotations
Free-hand pen tool
Color customization (stroke & fill)
Opacity controls

📦 Smart Grouping

Multi-level nested groups
Color-coded by hierarchy (purple → red → orange → green → blue)
Drag groups as single units
Perfect for organizing complex architectures

💾 Export & Save

PNG - High-quality images for docs
JSON - Version control your diagrams
Templates - Save and reuse common patterns
Auto-save - Never lose work

Tech Stack

Angular 21 - Modern reactive framework
Konva.js - High-performance canvas library
TypeScript - Type-safe diagram structures
RxJS - Reactive state management

Quick Start

Installation

npm install konva-architecture-canvas konva

Usage

import { Component } from '@angular/core';
import { KonvaCanvasMainComponent } from 'konva-architecture-canvas';

@Component({
  selector: 'app-diagram',
  standalone: true,
  imports: [KonvaCanvasMainComponent],
  template: `
    <lib-konva-canvas-main 
      style="display:block;width:100%;height:100vh">
    </lib-konva-canvas-main>
  `
})
export class DiagramComponent {}

That's it! You get:

Left sidebar with 47+ components
Drawing tools toolbar
Color/style panel
Zoom/pan controls
Keyboard shortcuts

Keyboard Shortcuts

Shortcut	Action
`Cmd+G`	Group selected items
`Cmd+Z`	Undo
`Cmd+Shift+Z`	Redo
`V`, `R`, `C`, `L`, `A`	Tool selection
`Space + Drag`	Pan canvas
`Delete`	Delete selected

Cool Implementation Details

1. Auto-Colored Groups

Groups automatically get colored borders based on nesting depth:

function getGroupColor(level: number): string {
  const colors = ['#9b59b6', '#e74c3c', '#f39c12', '#27ae60', '#3498db'];
  return colors[level % colors.length];
}

2. High-Quality Exports

Export with 2x pixel ratio for retina displays:

exportToPNG(scale: number = 2): void {
  const dataURL = this.stage.toDataURL({
    pixelRatio: scale,
    mimeType: 'image/png',
    quality: 1.0
  });
  this.downloadImage(dataURL);
}

3. Icon Caching

Dynamic icon loading with caching for performance:

private iconCache = new Map<string, string>();

async loadIcon(name: string): Promise<string> {
  return this.iconCache.get(name) ?? 
         await this.fetchAndCache(name);
}

Use Cases

1. RAG Architecture

Drag GPT-4, Pinecone, and API Gateway to visualize your RAG chatbot.

2. Microservices

Use grouping to organize services by domain.

3. Cloud Infrastructure

Build AWS/Azure/GCP architectures visually.

4. System Design Interviews

Quickly sketch solutions during technical interviews.

What's Different from Draw.io?

Feature	Konva Canvas	Draw.io
Tech Stack	Angular component	Standalone app
Components	47+ built-in	Manual search
Focus	Cloud & AI/ML	General purpose
Keyboard Shortcuts	Developer-friendly	Limited
Export	PNG, JSON, SVG	Many formats
License	MIT (open source)	Apache 2.0
Integration	npm package	iframe embed

Performance

Initial Load: ~2-3 seconds (icon loading)
60 FPS dragging/zooming with 50+ components
Bundle Size: ~680KB (gzipped)
Memory: ~50MB for typical diagram

Roadmap

[ ] Real-time collaboration
[ ] Cloud sync
[ ] VS Code extension
[ ] Export to Terraform/CDK
[ ] AI-powered auto-layout
[ ] Custom component creator

Try It!

🚀 Live Demo: https://samba425.github.io/konva-architecture-canvas/

📦 npm: npm install konva-architecture-canvas

⭐ GitHub: samba425/konva-architecture-canvas

Questions?

Drop them in the comments! I'd love to hear:

What features would you like?
What cloud services should I add?
Any bugs or issues?

If you find this useful, a GitHub star would be awesome! ⭐

Follow me for more dev tool content!

angular #javascript #typescript #canvas #devtools #opensource #cloudarchitecture #ai #ml

DEV Community: samba siva