notate

KO | EN

gitlite — search

#ai #llm #machine-learning #rust #linux #docker #macos #java #nodejs #windows #vue #awesome-list #mcp #ios

(★ 44)

Powerful handwritten notes app for Onyx devices

notate Latest Version Download

Download Latest Version (.zip)

// repository documentation

Was this content helpful?

★ 0 (0 ratings)

# Notate

[![Run Tests](https://github.com/alexdremov/notate/actions/workflows/test.yml/badge.svg)](https://github.com/alexdremov/notate/actions/workflows/test.yml)
[![GitHub release (latest by date)](https://img.shields.io/github/v/release/alexdremov/notate)](https://github.com/alexdremov/notate/releases/latest)

**Beautiful High-Performance Infinite Canvas for Onyx Boox e-ink devices**

## About Notate

Notate is an open-source note-taking application engineered specifically for **Onyx Boox E-Ink devices**.
The app implements a clean UI to streamline handwritten note-taking, with a focus on **performance** and **ergonomics**
without sacrificing extensive functionality.

## ✨ Features

| Feature | Description |
|---------|-------------|
| ⚡ **Zero-Latency Input** | Leverages the Onyx `EpdController` to write directly to the hardware frame buffer |
| ♾️ **Infinite Canvas** | An endless workspace with zoom from 1% to 1000% using tiles + level-of-detail optimizations |
| 📐 **Shape Recognition** | Draw and hold to snap rough strokes into perfect geometric shapes:  lines, triangles, rectangles, circles, pentagons, hexagons |
| 📄 **Backgrounds** | Blank, ruled, grid, or dots—customizable spacing, thickness, color, and padding |
| ✏️ **Scribble-to-Erase** | Quickly erase content by scribbling over it—detects zig-zag gesture density and velocity |
| 🧴 **Smart Erasers** | Stroke eraser, standard (partial) eraser, and lasso eraser modes |
| 📝 **Images** | Paste images seamlessly into the canvas |
| 🔗 **Deep Linking** | Create interactive links to other notes, local PDFs, or websites; content opens in draggable floating windows |
| 🔲 **Selection** | Rectangle and lasso selection modes to select, copy, and move strokes or images |
| 🧭 **Fixed Pages Mode** | Page Mode emulation with visual grid and thumbnail navigation |
| 🎨 **Deep Customization** | Pen styles (Fountain, Ballpoint, Fineliner, Highlighter, Brush, Charcoal), colors, and stroke sizes |
| 🛠️ **Customizable Toolbar** | Add, remove, and reorder toolbar items; supports collapsible auto-hide mode |
| ⏪ **Undo/Redo** | Unlimited undo/redo history |
| 📁 **Project Organization** | File browser with projects, folders, thumbnails, rename, duplicate, and delete |
| 🗺️ **Minimap** | Overview minimap showing viewport position within the canvas |
| 📱 **Beautiful UI** | A clean, intuitive interface with floating toolbars and sidebar |
| 📐 **Drawing Aids** | Angle snapping and axis locking for precise lines |
| 📤 **Export & Share** | Export to PDF (vector or raster) and share directly |
| ☁️ **Cloud Sync** | Google Drive / WebDAV integration with optional PDF sync |

## 🎮 Gestures & Controls

### Stylus (Pen) Input
| Gesture | Action |
|---------|--------|
| **Draw** | Standard pen input |
| **Hold (Dwell)** | Triggers shape recognition (configurable) |
| **Scribble** | Triggers erase mode over scribbled area (configurable) |
| **Pen Button** | Toggle Eraser temporarily while held |
| **Eraser Tail** | Flip stylus to use eraser mode |

### Finger Gestures
| Gesture | Action |
|---------|--------|
| **Pan (1 finger)** | Drag to move the viewport |
| **Pinch (2 fingers)** | Zoom in and out |
| **Long Press on Object** | Select stroke or image, then drag to move |
| **Long Press on Empty Area** | Open paste/insert image menu |
| **Tap Outside Selection** | Deselect current selection |
| **Tap UI** | Interact with floating toolbar or sidebar |
| **Two-Finger Double-Tap** | Undo |

### Selection Transforms (after selecting)
| Gesture | Action |
|---------|--------|
| **Drag Selection** | Move selected items |
| **Drag Corner Handle** | Scale selection from opposite corner |
| **Drag Rotation Handle** | Rotate selection with angle snapping (configurable) |
| **Two-Finger Pinch/Rotate** | Scale and rotate selection simultaneously |
---

## 📦 Installation

### Prerequisites

- **Device:** Onyx Boox (Android 11+ recommended)

### Relases

Download the latest APK from the [Releases](https://github.com/alexdremov/notate/releases) section and install it on your device.

### Build from Source

1. **Clone the repository:**
   ```bash
   git clone https://github.com/alexdremov/notate.git
   cd notate
   ```

2. **Build Debug APK:**
   ```bash
   ./gradlew app:assembleDebug
   ```
   APK will be at:  `app/build/outputs/apk/debug/app-debug.apk`

---

## 🏗️ Technical Architecture

For developers interested in E-Ink optimization, Notate employs several key patterns:

### Spatial Partitioning
Uses a **Quadtree** (`util/Quadtree.kt`) to manage stroke visibility, ensuring O(log N) query performance even with thousands of strokes.

### Ghosting Control
Automatically switches between eink different update mods to ensure smooth rendering on E-Ink displays.

### Tiled Rendering
The `TileManager` implements Level-of-Detail (LOD) with cached bitmap tiles, allowing smooth zooming across a virtually infinite canvas.

### Concurrency
Heavy tasks like tile generation and shape recognition run on dedicated `ThreadPoolExecutors` to keep the UI thread responsive.

### Key Classes

| Class | Purpose |
|-------|---------|
| `InfiniteCanvasModel` | Core data model with thread-safe stroke storage |
| `TileManager` | LOD-based tile caching and rendering |
| `Quadtree` | Spatial indexing for efficient stroke queries |
| `ShapeRecognizer` | Geometry recognition using Douglas-Peucker + competitive scoring |
| `ScribbleDetector` | Gesture analysis for scribble-to-erase |
| `PenInputHandler` | Input processing with dwell detection |

## 📄 License

This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.

---

## 🙏 Acknowledgments

- [Onyx Boox SDK](https://github.com/onyx-intl/OnyxAndroidDemo) for E-Ink pen input APIs
- [Notable](https://github.com/Ethran/notable) for inspiration
- [HiddenApiBypass](https://github.com/LSPosed/AndroidHiddenApiBypass) for SDK restrictions workaround

notate

notate Latest Version Download

Today's picks

Was this content helpful?

Recent Feedback

notate

notate Latest Version Download

Today's picks

Was this content helpful?

Recent Feedback

Download README