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ngDiagram – An open-source Angular library for creating rich, interactive diagramming experiences. Designed for flexibility and performance, it lets you build everything from simple flows to advanced visual editors with ease

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# ng-diagram

[![npm version](https://badge.fury.io/js/ng-diagram.svg)](https://badge.fury.io/js/ng-diagram)
[![License: Apache 2.0](https://img.shields.io/badge/license-Apache%202-blue)](https://opensource.org/license/apache-2-0)

A robust Angular library for building interactive diagrams, node-based editors, and visual programming interfaces. Designed with Angular and TypeScript, it offers a complete toolkit to create sophisticated, customizable, and high-performance diagramming applications.

Unlike generic diagramming libraries, **ng-diagram** is Angular-first - built on Angular signals and templates for seamless integration and performance.

![Interactive ng-diagram editor: custom Angular components as nodes — including a live chart — with groups, edge drawing, rotation, and zooming](https://raw.githubusercontent.com/synergycodes/ng-diagram/main/.github/assets/ngdiagram-hero.gif)

## ✨ Features

- **🎯 Interactive Elements**: Draggable, resizable, and rotatable nodes
- **🔗 Flexible Edges**: Orthogonal, polyline, and bezier routing, custom arrowheads, labels, and floating edges that connect without ports
- **🧩 Custom Templates**: Your own Angular components as nodes and edges — templates, signals, DI, everything works
- **📦 Groups**: Container nodes with nesting and group-aware dragging
- **🎛️ Rich Interactions**: Selection, box selection, copy/paste, snapping, panning, zooming, and more
- **⌨️ Keyboard Shortcuts**: Configurable, platform-aware bindings for all common actions
- **📱 Touch Support**: Pinch zoom, two-finger panning, and long-press box selection out of the box
- **🗺️ Minimap**: Bird's-eye overview widget with click-and-drag navigation
- **🎨 Consistent Styling**: Built-in design system with CSS variables and light/dark themes
- **🖱️ Embedded Palette**: Built-in drag-and-drop palette system for adding nodes to diagrams
- **⚡ Performance**: Signal-based reactivity, spatial hashing, and viewport virtualization for large diagrams
- **🔌 Extensible Architecture**: Middleware pipeline for custom behaviors and business logic
- **🤖 AI-Ready Docs**: Official [MCP server](https://www.npmjs.com/package/@ng-diagram/mcp) lets AI assistants search the docs and API from your editor

## 📚 What You Can Build

With ng-diagram, you can create:

- **Flow Diagrams**: Process flows, decision trees, and workflow visualizations
- **Node-Based Editors**: Visual programming interfaces and data flow editors
- **Network Diagrams**: System architectures and network topologies
- **Mind Maps**: Hierarchical information structures and brainstorming tools
- **Circuit Diagrams**: Electronic schematics and technical drawings
- **Custom Visualizations**: Any diagram type with custom node and edge templates

See our [Templates](#-templates) for production-ready examples you can fork and customize.

## 🎮 Try the Demo

See ng-diagram in action: **[Live Demo](https://synergycodes.github.io/ng-diagram-demo/)** | **[Source Code](https://github.com/synergycodes/ng-diagram-demo)**

## 🧩 Templates

Production-ready starter kits built with ng-diagram. Fork, customize, ship.

| Template                | Description                                                                                                   | Demo                                                                  | Source                                                                   |
| ----------------------- | ------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------- | ------------------------------------------------------------------------ |
| **Org Chart**           | Tree-based org chart with drag-and-drop reordering, expand/collapse, ELK.js layout, minimap, dark/light theme | [Live Demo](https://www.ngdiagram.dev/templates/org-chart/)           | [Source](https://github.com/synergycodes/ng-diagram-orgchart)            |
| **Electric Circuit**    | Electronic circuit editor with a searchable SVG parts library, smart wire junctions, and SVG/JPEG/JSON export | [Live Demo](https://www.ngdiagram.dev/templates/electric-circuit/)    | [Source](https://github.com/synergycodes/ng-diagram-electric-circuit)    |
| **Single-Line Diagram** | High-voltage substation SLD editor with IEC 60617 symbols and a schema-driven properties panel                | [Live Demo](https://www.ngdiagram.dev/templates/single-line-diagram/) | [Source](https://github.com/synergycodes/ng-diagram-single-line-diagram) |
| **AV Schematic**        | Audio/video signal-flow editor with typed connectors (XLR, HDMI, Speakon) and PNG/DXF export for AutoCAD      | [Live Demo](https://www.ngdiagram.dev/templates/av/)                  | [Source](https://github.com/synergycodes/ng-diagram-av-schematic)        |

## 🚀 Quick Start

### Installation

```bash
npm install ng-diagram
```

### Import Styles

**⚠️ Important:** You must import the required styles for the diagram to display correctly.
Because the library uses **CSS variables**, import the stylesheet in your **global file** (e.g. `src/styles.scss`), not inside a component.

```css
/* src/styles.scss */
@import 'ng-diagram/styles.css';
```

### Create Your First Diagram

```typescript
import { Component } from '@angular/core';
import { NgDiagramComponent, initializeModel, provideNgDiagram } from 'ng-diagram';

@Component({
  imports: [NgDiagramComponent],
  providers: [provideNgDiagram()],
  template: ` <ng-diagram [model]="model" /> `,
  styles: `
    :host {
      display: flex;
      height: 300px;
    }
  `,
})
export class MyDiagramComponent {
  model = initializeModel({
    nodes: [
      { id: '1', position: { x: 100, y: 150 }, data: { label: 'Node 1' } },
      { id: '2', position: { x: 400, y: 150 }, data: { label: 'Node 2' } },
    ],
    edges: [
      {
        id: '1',
        source: '1',
        sourcePort: 'port-right',
        targetPort: 'port-left',
        target: '2',
        data: {},
      },
    ],
  });
}
```

That's it! You now have a working diagram with default node and edge templates.

## 🎨 Customization

### Custom Nodes

Create custom node components with any Angular template:

```typescript
import { Component, input } from '@angular/core';
import { NgDiagramPortComponent, type NgDiagramNodeTemplate, type Node } from 'ng-diagram';

type CustomNodeData = { title: string; description: string };

@Component({
  selector: 'app-custom-node',
  imports: [NgDiagramPortComponent],
  template: `
    <div class="custom-node">
      <h3>{{ node().data.title }}</h3>
      <p>{{ node().data.description }}</p>
    </div>
    <ng-diagram-port id="input" side="left" type="target" />
    <ng-diagram-port id="output" side="right" type="source" />
  `,
  styles: [
    `
      .custom-node {
        background: #fff;
        border: 2px solid #333;
        border-radius: 8px;
        padding: 16px;
        min-width: 200px;
      }
    `,
  ],
})
export class CustomNodeComponent implements NgDiagramNodeTemplate<CustomNodeData> {
  node = input.required<Node<CustomNodeData>>();
}
```

### Custom Edges

Create custom edge components with unique visual styles:

```typescript
import { Component, input } from '@angular/core';
import { NgDiagramBaseEdgeComponent, type Edge, type NgDiagramEdgeTemplate } from 'ng-diagram';

@Component({
  selector: 'app-custom-edge',
  imports: [NgDiagramBaseEdgeComponent],
  template: ` <ng-diagram-base-edge [edge]="edge()" stroke="#962ee5" [strokeWidth]="2" /> `,
})
export class CustomEdgeComponent implements NgDiagramEdgeTemplate {
  edge = input.required<Edge>();
}
```

## 🛠️ Core Building Blocks

The library ships **components** for the diagram canvas, backgrounds, ports, palette, and minimap; **injectable services** (model, nodes, selection, viewport, clipboard, groups) for programmatic control; and **directives** for selection and highlight styling. Start with the [Services guide](https://www.ngdiagram.dev/docs/intro/services/) and browse the full API reference in the [documentation](https://www.ngdiagram.dev/docs).

## 👩‍💻 About the Creators

ng-diagram is built and maintained by [**Synergy Codes**](https://www.synergycodes.com) - a team of developers who’ve spent **over a decade designing and delivering diagramming solutions** for clients worldwide.

We are continuously distilling everything we know about building interactive diagrams, editors, and visual tools into this library. Our goal is simple: to empower Angular developers to create diagramming applications faster, easier, and with confidence.

When you use this library, you can be sure you’re in **good hands** - backed by a team that knows diagrams inside out.

## 📖 Documentation

For comprehensive documentation, examples, and API reference, visit:

**📚 [Full Documentation](https://www.ngdiagram.dev/docs)**

The documentation includes:

- Detailed API reference
- Interactive examples
- Customization guides
- Best practices
- Advanced use cases

## 🤖 MCP Server

Use AI assistants like Claude, Cursor, or Windsurf to search ng-diagram docs and API directly from your editor. No browser needed.

```json
{
  "mcpServers": {
    "ng-diagram-docs": {
      "command": "npx",
      "args": ["-y", "@ng-diagram/mcp"]
    }
  }
}
```

See [@ng-diagram/mcp](https://www.npmjs.com/package/@ng-diagram/mcp) for setup details and Windows configuration.

## 🔧 Requirements

- **Angular**: 18.0.0 or higher
- **TypeScript**: 5.6.0 or higher
- **Node.js**: 18.19.1 or higher

## 📄 License

This project is licensed under the Apache 2.0 License - see the [LICENSE](https://github.com/synergycodes/ng-diagram/blob/main/LICENSE) file for details.

## 🔗 Links

- **Documentation**: [https://www.ngdiagram.dev/docs](https://www.ngdiagram.dev/docs)
- **GitHub**: [https://github.com/synergycodes/ng-diagram](https://github.com/synergycodes/ng-diagram)
- **NPM**: [https://www.npmjs.com/package/ng-diagram](https://www.npmjs.com/package/ng-diagram)
- **MCP Server**: [@ng-diagram/mcp](https://www.npmjs.com/package/@ng-diagram/mcp) - let AI assistants search ng-diagram docs and API
- **Website**: [https://www.ngdiagram.dev](https://www.ngdiagram.dev)

## 🆘 Support

- **Issues**: [GitHub Issues](https://github.com/synergycodes/ng-diagram/issues)
- **Discussions**: [GitHub Discussions](https://github.com/synergycodes/ng-diagram/discussions), [Discord](https://discord.gg/FDMjRuarFb)
- **Project consulting**: [Contact](https://www.ngdiagram.dev/contact)
- **Documentation**: [https://www.ngdiagram.dev/docs](https://www.ngdiagram.dev/docs)

---

Built with ❤️ by the [Synergy Codes](https://www.synergycodes.com/) team

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