17 | )) 18 | Card.displayName = "Card" 19 | 20 | const CardHeader = React.forwardRef< 21 | HTMLDivElement, 22 | React.HTMLAttributes 23 | >(({ className, ...props }, ref) => ( 24 |

29 | )) 30 | CardHeader.displayName = "CardHeader" 31 | 32 | const CardTitle = React.forwardRef< 33 | HTMLDivElement, 34 | React.HTMLAttributes 35 | >(({ className, ...props }, ref) => ( 36 |

41 | )) 42 | CardTitle.displayName = "CardTitle" 43 | 44 | const CardDescription = React.forwardRef< 45 | HTMLDivElement, 46 | React.HTMLAttributes 47 | >(({ className, ...props }, ref) => ( 48 |

53 | )) 54 | CardDescription.displayName = "CardDescription" 55 | 56 | const CardContent = React.forwardRef< 57 | HTMLDivElement, 58 | React.HTMLAttributes 59 | >(({ className, ...props }, ref) => ( 60 |

61 | )) 62 | CardContent.displayName = "CardContent" 63 | 64 | const CardFooter = React.forwardRef< 65 | HTMLDivElement, 66 | React.HTMLAttributes 67 | >(({ className, ...props }, ref) => ( 68 |

73 | )) 74 | CardFooter.displayName = "CardFooter" 75 | 76 | export { Card, CardHeader, CardFooter, CardTitle, CardDescription, CardContent } 77 | -------------------------------------------------------------------------------- /circuitpython/bmpread.py: -------------------------------------------------------------------------------- 1 | def read_bmp(chunk_iterator, bitmap, palette): 2 | """Read an entire BMP file into the provided bitmap and palette""" 3 | # Get first chunk for headers and palette 4 | chunk = next(chunk_iterator) 5 | buffer = bytearray(chunk) 6 | while len(buffer) < 70: # Need 54 for header + 16 for palette 7 | buffer.extend(next(chunk_iterator)) 8 | 9 | # Read palette (starts at offset 54) 10 | for i in range(4): 11 | offset = 54 + (i * 4) 12 | b = buffer[offset] 13 | g = buffer[offset + 1] 14 | r = buffer[offset + 2] 15 | palette[i] = (r << 16) | (g << 8) | b 16 | 17 | changed = False 18 | x = 0 19 | y = 0 20 | 21 | # Process remaining buffer bytes 22 | for pos in range(70, len(buffer)): 23 | byte = buffer[pos] 24 | if not changed and ( # Only check if we haven't found changes yet 25 | bitmap[x, y] != ((byte >> 6) & 0x03) or 26 | bitmap[x + 1, y] != ((byte >> 4) & 0x03) or 27 | bitmap[x + 2, y] != ((byte >> 2) & 0x03) or 28 | bitmap[x + 3, y] != (byte & 0x03)): 29 | changed = True 30 | bitmap[x, y] = (byte >> 6) & 0x03 31 | bitmap[x + 1, y] = (byte >> 4) & 0x03 32 | bitmap[x + 2, y] = (byte >> 2) & 0x03 33 | bitmap[x + 3, y] = byte & 0x03 34 | 35 | x += 4 36 | if x >= 800: 37 | x = 0 38 | y += 1 39 | 40 | # Process remaining chunks 41 | while y < 480: 42 | chunk = next(chunk_iterator) 43 | for byte in chunk: 44 | if not changed and ( # Only check if we haven't found changes yet 45 | bitmap[x, y] != ((byte >> 6) & 0x03) or 46 | bitmap[x + 1, y] != ((byte >> 4) & 0x03) or 47 | bitmap[x + 2, y] != ((byte >> 2) & 0x03) or 48 | bitmap[x + 3, y] != (byte & 0x03)): 49 | changed = True 50 | bitmap[x, y] = (byte >> 6) & 0x03 51 | bitmap[x + 1, y] = (byte >> 4) & 0x03 52 | bitmap[x + 2, y] = (byte >> 2) & 0x03 53 | bitmap[x + 3, y] = byte & 0x03 54 | 55 | x += 4 56 | if x >= 800: 57 | x = 0 58 | y += 1 59 | if y >= 480: 60 | break 61 | 62 | return changed -------------------------------------------------------------------------------- /circuitpython/draw.py: -------------------------------------------------------------------------------- 1 | import time 2 | import displayio 3 | import waveshare7in5bv3 4 | import adafruit_connection_manager 5 | import wifi 6 | import adafruit_requests 7 | import bmpread 8 | import microcontroller 9 | 10 | host = "your-domain.com" 11 | 12 | displayio.release_displays() 13 | display = waveshare7in5bv3.Waveshare7in5Bv3() 14 | 15 | pool = None 16 | ssl_context = None 17 | requests = None 18 | errors = 0 19 | 20 | # Create the bitmap that matches display exactly 21 | bitmap = displayio.Bitmap(800, 480, 4) 22 | palette = displayio.Palette(4) 23 | 24 | # Create a group and add the bitmap with its palette - do this once 25 | group = displayio.Group() 26 | tile_grid = displayio.TileGrid(bitmap, pixel_shader=palette) 27 | group.append(tile_grid) 28 | display.root_group = group 29 | 30 | while True: 31 | if errors > 20: 32 | print("Too many errors, restarting") 33 | microcontroller.reset() 34 | 35 | # Set up network 36 | try: 37 | pool = adafruit_connection_manager.get_radio_socketpool(wifi.radio) 38 | ssl_context = adafruit_connection_manager.get_radio_ssl_context(wifi.radio) 39 | requests = adafruit_requests.Session(pool, ssl_context) 40 | except Exception as e: 41 | print(f"Error setting up network: {e}") 42 | errors += 1 43 | time.sleep(10) 44 | continue 45 | 46 | response = None 47 | try: 48 | response = requests.get(f"https://{host}/drawing.bmp") 49 | print(response.status_code) 50 | except Exception as e: 51 | print(f"Error getting image: {e}") 52 | errors += 1 53 | time.sleep(10) 54 | continue 55 | 56 | changed = False 57 | if response and response.status_code == 200: 58 | try: 59 | content = response.iter_content(chunk_size=1024) 60 | print("about to read bmp") 61 | changed = bmpread.read_bmp(content, bitmap, palette) # This updates the existing bitmap 62 | print("finished reading bmp") 63 | except Exception as e: 64 | print(f"Error loading image: {e}") 65 | errors += 1 66 | time.sleep(10) 67 | continue 68 | finally: 69 | response.close() 70 | 71 | if changed: 72 | print("about to refresh") 73 | display.refresh() 74 | print("refreshed") 75 | else: 76 | print("no changes") 77 | 78 | time.sleep(180) -------------------------------------------------------------------------------- /shared/PxBrush.ts: -------------------------------------------------------------------------------- 1 | // Copyright 2015 - 2025 Krasimir Tsonev, Nick Winans 2 | // SPDX-License-Identifier: MIT 3 | 4 | // This is a modified version of the PxBrush class from the original project https://github.com/kozo002/px-brush 5 | 6 | import StampMaker from './StampMaker' 7 | 8 | export default class PxBrush { 9 | canvas: HTMLCanvasElement 10 | context: CanvasRenderingContext2D 11 | stampMaker: StampMaker 12 | 13 | constructor (canvas: HTMLCanvasElement) { 14 | this.canvas = canvas 15 | this.context = canvas.getContext('2d')! 16 | this.stampMaker = new StampMaker() 17 | this.configPixelRatio() 18 | } 19 | 20 | get dpr () { 21 | return window.devicePixelRatio || 1 22 | } 23 | 24 | configPixelRatio () { 25 | this.context.imageSmoothingEnabled = false 26 | } 27 | 28 | distanceBetween (point1: { x: number; y: number }, point2: { x: number; y: number }) { 29 | return Math.sqrt(Math.pow(point2.x - point1.x, 2) + Math.pow(point2.y - point1.y, 2)) 30 | } 31 | 32 | angleBetween (point1: { x: number; y: number }, point2: { x: number; y: number }) { 33 | return Math.atan2(point2.x - point1.x, point2.y - point1.y) 34 | } 35 | 36 | draw ({ from, to, size, color }: { from: { x: number; y: number }; to: { x: number; y: number }; size: number; color: string }) { 37 | this.context.globalCompositeOperation = 'source-over' 38 | this.brush({ from, to, size, color }) 39 | } 40 | 41 | erase ({ from, to, size }: { from: { x: number; y: number }; to: { x: number; y: number }; size: number }) { 42 | this.context.globalCompositeOperation = 'destination-out' 43 | this.brush({ from, to, size, color: '#000000' }) 44 | } 45 | 46 | brush ({ from, to, size, color }: { from: { x: number; y: number }; to: { x: number; y: number }; size: number; color: string }) { 47 | const halfSize = (size - (size % 2)) / 2 48 | const stamp = this.stampMaker.make({ size, color })! 49 | if (from.x === to.x && from.y === to.y) { 50 | const x = from.x - halfSize 51 | const y = from.y - halfSize 52 | this.context.drawImage(stamp, Math.round(x), Math.round(y), size, size) 53 | return 54 | } 55 | const dist = this.distanceBetween(from, to) 56 | const angle = this.angleBetween(from, to) 57 | for (let i = 0; i < dist; i += 1) { 58 | const x = from.x + (Math.sin(angle) * i) - halfSize 59 | const y = from.y + (Math.cos(angle) * i) - halfSize 60 | this.context.drawImage(stamp, Math.round(x), Math.round(y), size, size) 61 | } 62 | } 63 | } 64 | -------------------------------------------------------------------------------- /shared/Utilities.ts: -------------------------------------------------------------------------------- 1 | import PxBrush from "./PxBrush"; 2 | 3 | const hexToRgb = (hex: string) => { 4 | const result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex); 5 | return result 6 | ? { 7 | r: parseInt(result[1], 16), 8 | g: parseInt(result[2], 16), 9 | b: parseInt(result[3], 16), 10 | } 11 | : null; 12 | }; 13 | 14 | export const colors = { 15 | black: "#000000", 16 | white: "#ffffff", 17 | red: "#ff0000", 18 | } 19 | export const brushSizes = { 20 | "brush-small": 2, 21 | "brush-medium": 5, 22 | "brush-large": 10, 23 | } 24 | 25 | export function fill( 26 | context: CanvasRenderingContext2D, 27 | width: number, 28 | height: number, 29 | x: number, 30 | y: number, 31 | color: string 32 | ) { 33 | const imageData = context.getImageData(0, 0, width, height); 34 | const pixels = imageData.data; 35 | 36 | const startX = x; 37 | const startY = y; 38 | const startPos = (startY * width + startX) * 4; 39 | const startR = pixels[startPos]; 40 | const startG = pixels[startPos + 1]; 41 | const startB = pixels[startPos + 2]; 42 | 43 | const fillColorRGB = hexToRgb(color); 44 | if (!fillColorRGB) return; 45 | 46 | if ( 47 | startR === fillColorRGB.r && 48 | startG === fillColorRGB.g && 49 | startB === fillColorRGB.b 50 | ) 51 | return; 52 | 53 | const queue = [[startX, startY]]; 54 | const visited = new Set(); 55 | 56 | const matchesStartColor = (x: number, y: number) => { 57 | const pos = (y * width + x) * 4; 58 | return ( 59 | pixels[pos] === startR && 60 | pixels[pos + 1] === startG && 61 | pixels[pos + 2] === startB 62 | ); 63 | }; 64 | 65 | const setPixel = (x: number, y: number) => { 66 | const pos = (y * width + x) * 4; 67 | pixels[pos] = fillColorRGB.r; 68 | pixels[pos + 1] = fillColorRGB.g; 69 | pixels[pos + 2] = fillColorRGB.b; 70 | pixels[pos + 3] = 255; 71 | }; 72 | 73 | while (queue.length > 0) { 74 | const [x, y] = queue.shift()!; 75 | const key = `${x},${y}`; 76 | 77 | if (visited.has(key)) continue; 78 | if (x < 0 || x >= width || y < 0 || y >= height) continue; 79 | if (!matchesStartColor(x, y)) continue; 80 | 81 | setPixel(x, y); 82 | visited.add(key); 83 | 84 | if (x > 0) queue.push([x - 1, y]); 85 | if (x < width - 1) queue.push([x + 1, y]); 86 | if (y > 0) queue.push([x, y - 1]); 87 | if (y < height - 1) queue.push([x, y + 1]); 88 | 89 | if (queue.length > 10000) break; 90 | } 91 | 92 | context.putImageData(imageData, 0, 0); 93 | } 94 | 95 | export function draw( 96 | brush: PxBrush, 97 | points: { x: number; y: number }[], 98 | color: string, 99 | brushSize: number 100 | ) { 101 | if (points.length < 1) return; 102 | 103 | if (points.length === 1) { 104 | brush.draw({ 105 | from: points[0], 106 | to: points[0], 107 | color: color, 108 | size: brushSize, 109 | }); 110 | } else { 111 | for (let i = 1; i < points.length; i++) { 112 | brush.draw({ 113 | from: points[i - 1], 114 | to: points[i], 115 | color: color, 116 | size: brushSize, 117 | }); 118 | } 119 | } 120 | } 121 | -------------------------------------------------------------------------------- /nginx.conf: -------------------------------------------------------------------------------- 1 | server { 2 | listen 80; 3 | 4 | server_name localhost; 5 | 6 | # Enhanced security headers 7 | add_header X-Frame-Options "SAMEORIGIN" always; 8 | add_header X-XSS-Protection "1; mode=block" always; 9 | add_header X-Content-Type-Options "nosniff" always; 10 | add_header Referrer-Policy "strict-origin-when-cross-origin" always; 11 | 12 | # Root directory for static files 13 | root /usr/share/nginx/html; 14 | index index.html; 15 | 16 | # Static file serving with optimized caching 17 | location / { 18 | try_files $uri $uri/ /index.html; 19 | 20 | # Disable caching for HTML to always check for updates 21 | location ~* \.html$ { 22 | expires -1; 23 | add_header Cache-Control "no-store, no-cache, must-revalidate"; 24 | } 25 | 26 | # Cache bust other static assets with query strings or file hashes 27 | location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg)$ { 28 | expires 1y; 29 | add_header Cache-Control "public, immutable"; 30 | } 31 | 32 | # Optimize static file serving 33 | tcp_nodelay on; 34 | tcp_nopush on; 35 | sendfile on; 36 | 37 | # Gzip compression for static files 38 | gzip on; 39 | gzip_types text/plain text/css application/javascript application/json image/svg+xml; 40 | gzip_min_length 1000; 41 | } 42 | 43 | # WebSocket proxy with optimized settings 44 | location /ws { 45 | proxy_pass http://app:3001; 46 | proxy_http_version 1.1; 47 | proxy_set_header Upgrade $http_upgrade; 48 | proxy_set_header Connection "upgrade"; 49 | proxy_set_header Host $host; 50 | proxy_set_header X-Real-IP $remote_addr; 51 | proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; 52 | proxy_set_header X-Forwarded-Proto $scheme; 53 | 54 | # WebSocket timeouts 55 | proxy_read_timeout 300s; 56 | proxy_connect_timeout 75s; 57 | proxy_send_timeout 300s; 58 | 59 | # WebSocket specific optimizations 60 | proxy_buffering off; 61 | proxy_cache off; 62 | } 63 | 64 | # Drawing endpoint proxy with optimized settings 65 | location /drawing.bmp { 66 | proxy_pass http://app:3001; 67 | proxy_set_header Host $host; 68 | proxy_set_header X-Real-IP $remote_addr; 69 | proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; 70 | proxy_set_header X-Forwarded-Proto $scheme; 71 | 72 | # Since this is real-time generated content 73 | proxy_buffering off; 74 | proxy_cache off; 75 | expires -1; 76 | add_header Cache-Control "no-store, no-cache, must-revalidate"; 77 | } 78 | 79 | # Health check endpoint proxy 80 | location /health { 81 | proxy_pass http://app:3001; 82 | proxy_set_header Host $host; 83 | proxy_set_header X-Real-IP $remote_addr; 84 | proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; 85 | proxy_set_header X-Forwarded-Proto $scheme; 86 | 87 | # Optimize for health checks 88 | proxy_buffering off; 89 | proxy_cache off; 90 | expires -1; 91 | add_header Cache-Control "no-store, no-cache, must-revalidate"; 92 | } 93 | 94 | # Deny access to . files 95 | location ~ /\. { 96 | deny all; 97 | access_log off; 98 | log_not_found off; 99 | } 100 | } -------------------------------------------------------------------------------- /src/components/ui/dialog.tsx: -------------------------------------------------------------------------------- 1 | import * as React from "react" 2 | import * as DialogPrimitive from "@radix-ui/react-dialog" 3 | import { X } from "lucide-react" 4 | 5 | import { cn } from "@/lib/utils" 6 | 7 | const Dialog = DialogPrimitive.Root 8 | 9 | const DialogTrigger = DialogPrimitive.Trigger 10 | 11 | const DialogPortal = DialogPrimitive.Portal 12 | 13 | const DialogClose = DialogPrimitive.Close 14 | 15 | const DialogOverlay = React.forwardRef< 16 | React.ElementRef, 17 | React.ComponentPropsWithoutRef 18 | >(({ className, ...props }, ref) => ( 19 | 27 | )) 28 | DialogOverlay.displayName = DialogPrimitive.Overlay.displayName 29 | 30 | const DialogContent = React.forwardRef< 31 | React.ElementRef, 32 | React.ComponentPropsWithoutRef 33 | >(({ className, children, ...props }, ref) => ( 34 | 35 | 36 | 44 | {children} 45 | 46 | 47 | Close 48 | 49 | 50 | 51 | )) 52 | DialogContent.displayName = DialogPrimitive.Content.displayName 53 | 54 | const DialogHeader = ({ 55 | className, 56 | ...props 57 | }: React.HTMLAttributes) => ( 58 |

65 | ) 66 | DialogHeader.displayName = "DialogHeader" 67 | 68 | const DialogFooter = ({ 69 | className, 70 | ...props 71 | }: React.HTMLAttributes) => ( 72 |

79 | ) 80 | DialogFooter.displayName = "DialogFooter" 81 | 82 | const DialogTitle = React.forwardRef< 83 | React.ElementRef, 84 | React.ComponentPropsWithoutRef 85 | >(({ className, ...props }, ref) => ( 86 | 94 | )) 95 | DialogTitle.displayName = DialogPrimitive.Title.displayName 96 | 97 | const DialogDescription = React.forwardRef< 98 | React.ElementRef, 99 | React.ComponentPropsWithoutRef 100 | >(({ className, ...props }, ref) => ( 101 | 106 | )) 107 | DialogDescription.displayName = DialogPrimitive.Description.displayName 108 | 109 | export { 110 | Dialog, 111 | DialogPortal, 112 | DialogOverlay, 113 | DialogTrigger, 114 | DialogClose, 115 | DialogContent, 116 | DialogHeader, 117 | DialogFooter, 118 | DialogTitle, 119 | DialogDescription, 120 | } 121 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # InkLink 2 | ### *Real-time Collaborative E-Paper Canvas* 3 | 4 | A collaborative drawing system with a web interface that syncs to an e-paper display. 5 | 6 | ### Key Features 7 | - Real-time collaborative drawing interface 8 | - Web-based access from any device 9 | - E-paper display sync every 3 minutes 10 | - Multi-user support via WebSocket 11 | - Tri-color display support (black, white, and red) 12 | 13 | ![InkLink](./images/inklink.jpg) 14 | 15 | ### Try out the web demo [here](https://inklink.winans.io) 16 | 17 | ### Read [my blog post](https://nick.winans.io/blog/ink-link/) to get an overview of the project 18 | 19 | This project uses a 7.5" tri-color e-paper display to display the drawing from the web interface. The website is real-time and supports multiple concurrent users with websockets. The e-paper display will update every three minutes. 20 | 21 | ## Hardware Setup 22 | Total cost: ~$45-$85 23 | 24 | ### Required Components 25 | - Waveshare 7.5 B V3 E-Paper Display (~$30-$50) 26 | - [Waveshare](https://www.waveshare.com/7.5inch-e-paper-b.htm) 27 | - [Amazon](https://www.amazon.com/7-5inch-Three-Color-Paper-Like-Displaying-Electricity/dp/B09JSFTGV6) 28 | - [Aliexpress](https://www.aliexpress.us/item/3256806387212613.html) ([Alternate](https://www.aliexpress.us/item/3256806989536255.html)) 29 | - [Good Display](https://www.good-display.com/product/394.html) ([Store](https://buyepaper.com/products/red-tri-color-e-paper-display-partial-update-gdey075z08)) 30 | - Waveshare ESP32 E-Paper Driver Board (~$10-$20) 31 | - [Waveshare](https://www.waveshare.com/e-paper-esp32-driver-board.htm) 32 | - [Amazon](https://www.amazon.com/Waveshare-Universal-Driver-Board-ESP32/dp/B07M5CNP3B) 33 | - [Aliexpress](https://www.aliexpress.us/item/3256807183975806.html) 34 | - 3D printed case front, back, and cover (~$2-$10) 35 | - [3D files available here](https://github.com/Nicell/InkLink/tree/main/3d-files) 36 | - A micro USB to USB-C adapter (~$5) 37 | - [Amazon](https://www.amazon.com/Togconn-Adapter-Convert-Connector-Support/dp/B0CDP9JWVY) 38 | - A USB-C cable and a power supply 39 | 40 | ### Assembly Instructions 41 | 1. Print the three case components 42 | 2. Place the display in the front 43 | 3. Put the back plate on, feed the ribbon cable through the hole 44 | 4. Glue the back plate to the front 45 | 5. Place the ESP32 on the back plate and hot glue it in place 46 | - Placement is right above the hole with the headers touching the back plate 47 | - Test placement with the cover on top before gluing 48 | 6. Put the micro USB to USB-C adapter into the microcontroller 49 | 7. Place the cover over the microcontroller 50 | 8. Glue the cover to the back plate 51 | 52 | ## Software Setup 53 | 54 | ### E-Paper Display Setup 55 | 1. Install CircuitPython on the ESP32 board: 56 | - I used the [DOIT ESP32](https://circuitpython.org/board/doit_esp32_devkit_v1/) firmware 57 | - Follow the [CircuitPython ESP32 Quick Start Guide](https://learn.adafruit.com/circuitpython-with-esp32-quick-start/installing-circuitpython) to get your device on your network and the code editor running 58 | 59 | 2. Install required CircuitPython libraries: 60 | - Download the [Adafruit CircuitPython Library Bundle](https://circuitpython.org/libraries) for your version of CircuitPython 61 | - Install the following libraries to your lib folder with the web file manager: 62 | - adafruit_connection_manager 63 | - adafruit_requests 64 | 65 | 3. Copy the [CircuitPython files](https://github.com/Nicell/InkLink/tree/main/circuitpython) to your device through the web file manager or code editor: 66 | - `waveshare7in5bv3.py` 67 | - `draw.py` - Make sure to set the host variable to your server's domain 68 | - `bmpread.py` 69 | 70 | 4. Once you're ready to test, edit `code.py` to run `draw.py` 71 | ```python 72 | import draw 73 | ``` 74 | 75 | ### Server Setup 76 | 77 | 1. Clone the repository: 78 | ```bash 79 | git clone 80 | cd inklink 81 | ``` 82 | 83 | 2. Deploy using Docker Compose: 84 | ```bash 85 | docker compose up -d 86 | ``` 87 | 88 | 3. (Optional) Set variables: 89 | - `VITE_WEB_TITLE` - The title of the web interface (build time variable) 90 | - `CLEAR_CRON` - The cron schedule for clearing the drawing (e.g. `0 6 * * 1` for every Monday at 6am) 91 | 92 | 4. Update the hostname in `draw.py` to your server's domain 93 | 94 | ## License 95 | 96 | This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details. 97 | -------------------------------------------------------------------------------- /shared/StampMaker.ts: -------------------------------------------------------------------------------- 1 | // Copyright 2015 - 2025 Krasimir Tsonev, Nick Winans 2 | // SPDX-License-Identifier: MIT 3 | 4 | // This is a modified version of the StampMaker class from the original project https://github.com/kozo002/px-brush 5 | 6 | let createCanvas: any; 7 | if (typeof window === "undefined") { 8 | import("@napi-rs/canvas").then((module) => { 9 | createCanvas = module.createCanvas; 10 | }); 11 | } 12 | 13 | const HexPattern = /^#?[0-9A-Fa-f]{1,2}[0-9A-Fa-f]{1,2}[0-9A-Fa-f]{1,2}$/; 14 | const RGBPattern = 15 | /^rgb$(\s+)?[0-9]{1,3},(\s+)?[0-9]{1,3},(\s+)?[0-9]{1,3}(\s+)?$$/; 16 | 17 | export default class StampMaker { 18 | canvases: Record> = {}; 19 | constructor() { 20 | this.canvases = {}; 21 | } 22 | 23 | parseColor(color: string) { 24 | const isHex = HexPattern.test(color); 25 | const isRGB = RGBPattern.test(color); 26 | if (!isHex && !isRGB) { 27 | throw new Error( 28 | "Color is not correct format. #123123 or rgb(123, 123, 123) format required." 29 | ); 30 | } 31 | if (isHex) { 32 | let c = color[0] === "#" ? color.slice(1) : color; 33 | c = 34 | c.length === 3 35 | ? c 36 | .split("") 37 | .reduce((acc: string[], it: string) => [...acc, it, it], []) 38 | .join("") 39 | : c; 40 | const r = parseInt(c.slice(0, 2), 16); 41 | const g = parseInt(c.slice(2, 4), 16); 42 | const b = parseInt(c.slice(4, 6), 16); 43 | return { r, g, b }; 44 | } 45 | if (isRGB) { 46 | let [r, g, b] = color 47 | .replace(/rgb|\s+|$|$/g, "") 48 | .split(",") 49 | .map((it) => parseInt(it)); 50 | r = r > 255 ? 255 : r; 51 | g = g > 255 ? 255 : g; 52 | b = b > 255 ? 255 : b; 53 | return { r, g, b }; 54 | } 55 | } 56 | 57 | make({ size, color }: { size: number; color: string }) { 58 | try { 59 | const _color = this.parseColor(color)!; 60 | const _strColor = JSON.stringify(_color); 61 | this.canvases[_strColor] = this.canvases[_strColor] || {}; 62 | 63 | if (this.canvases[_strColor][size] != null) { 64 | return this.canvases[_strColor][size]; 65 | } 66 | 67 | let canvas: HTMLCanvasElement; 68 | size = size + (size % 2); 69 | if (typeof window !== "undefined") { 70 | canvas = document.createElement("canvas"); 71 | canvas.width = size; 72 | canvas.height = size; 73 | } else { 74 | canvas = createCanvas(size, size) as unknown as HTMLCanvasElement; 75 | } 76 | 77 | const context = canvas.getContext("2d")!; 78 | const imageData = context.createImageData(size, size); 79 | for (let i = 0; i < imageData.data.length; i += 4) { 80 | imageData.data[i] = 255; 81 | imageData.data[i + 1] = 255; 82 | imageData.data[i + 2] = 255; 83 | imageData.data[i + 3] = 0; 84 | } 85 | this.plotCircle( 86 | size * 2, 87 | size * 4 * (size / 2), 88 | size / 2, 89 | imageData, 90 | size, 91 | _color 92 | ); 93 | this.fillCircle(imageData, _color); 94 | context.putImageData(imageData, 0, 0); 95 | this.canvases[_strColor][size] = canvas; 96 | return canvas; 97 | } catch (err) { 98 | console.error(err); 99 | } 100 | } 101 | 102 | plotCircle( 103 | xm: number, 104 | ym: number, 105 | r: number, 106 | imageData: ImageData, 107 | size: number, 108 | color: { r: number; g: number; b: number } 109 | ) { 110 | let x = -r; 111 | let y = 0; 112 | let err = 2 - 2 * r; /* bottom left to top right */ 113 | 114 | do { 115 | /* I. Quadrant +x +y */ 116 | const i = xm - (x + 1) * 4 + (ym + (y - 1) * (size * 4)); 117 | imageData.data[i + 0] = color.r; 118 | imageData.data[i + 1] = color.g; 119 | imageData.data[i + 2] = color.b; 120 | imageData.data[i + 3] = 255; 121 | /* II. Quadrant -x +y */ 122 | const ii = xm - y * (size * 4) + (ym - (x + 1) * 4); 123 | imageData.data[ii + 0] = color.r; 124 | imageData.data[ii + 1] = color.g; 125 | imageData.data[ii + 2] = color.b; 126 | imageData.data[ii + 3] = 255; 127 | /* III. Quadrant -x -y */ 128 | const iii = xm + x * 4 + (ym - y * (size * 4)); 129 | imageData.data[iii + 0] = color.r; 130 | imageData.data[iii + 1] = color.g; 131 | imageData.data[iii + 2] = color.b; 132 | imageData.data[iii + 3] = 255; 133 | /* IV. Quadrant +x -y */ 134 | const iv = xm + (y - 1) * (size * 4) + (ym + x * 4); 135 | imageData.data[iv + 0] = color.r; 136 | imageData.data[iv + 1] = color.g; 137 | imageData.data[iv + 2] = color.b; 138 | imageData.data[iv + 3] = 255; 139 | r = err; 140 | if (r <= y) { 141 | err += ++y * 2 + 1; /* y step */ 142 | } 143 | if (r > x || err > y) { 144 | err += ++x * 2 + 1; /* x step */ 145 | } 146 | } while (x < 0); 147 | } 148 | 149 | fillCircle(imageData: ImageData, color: { r: number; g: number; b: number }) { 150 | const cols = imageData.width * 4; 151 | for (let row = 1; row < imageData.height - 1; row += 1) { 152 | let isHitColor = false; 153 | let isHitClear = false; 154 | let isEnded = false; 155 | for (let col = 0; col < cols; col += 4) { 156 | const index = cols * row + col; 157 | const alpha = imageData.data[index + 3]; 158 | const isColor = alpha === 255; 159 | const isClear = alpha === 0; 160 | if (isColor && !isHitColor) { 161 | isHitColor = true; 162 | } else if (isClear && isHitColor) { 163 | isHitClear = true; 164 | } else if (isColor && isHitColor && isHitClear) { 165 | isEnded = true; 166 | } 167 | if (isHitColor && isHitClear && !isEnded) { 168 | imageData.data[index] = color.r; 169 | imageData.data[index + 1] = color.g; 170 | imageData.data[index + 2] = color.b; 171 | imageData.data[index + 3] = 255; 172 | } 173 | } 174 | } 175 | } 176 | } 177 | -------------------------------------------------------------------------------- /server/index.ts: -------------------------------------------------------------------------------- 1 | import { createCanvas, Canvas, SKRSContext2D } from "@napi-rs/canvas"; 2 | import PxBrush from "../shared/PxBrush"; 3 | import { CronJob } from "cron"; 4 | import { CanvasAction } from "../shared/Actions"; 5 | import { brushSizes, colors, draw, fill } from "../shared/Utilities"; 6 | 7 | // Server-side canvas 8 | let canvas: Canvas; 9 | let ctx: SKRSContext2D; 10 | let saveTimeout: NodeJS.Timeout | null = null; 11 | let lastSave = Date.now(); 12 | let brush: PxBrush; 13 | 14 | const CANVAS_WIDTH = 800; 15 | const CANVAS_HEIGHT = 480; 16 | const SAVE_THROTTLE = 5000; 17 | const SAVE_PATH = "./drawings/current.bmp"; 18 | 19 | const initialize = async () => { 20 | // Initialize canvas and ensure drawings directory exists 21 | try { 22 | canvas = createCanvas(CANVAS_WIDTH, CANVAS_HEIGHT); 23 | ctx = canvas.getContext("2d"); 24 | brush = new PxBrush(canvas as unknown as HTMLCanvasElement); 25 | 26 | // Set initial white background 27 | ctx.fillStyle = "#ffffff"; 28 | ctx.fillRect(0, 0, CANVAS_WIDTH, CANVAS_HEIGHT); 29 | 30 | // Load existing drawing if it exists 31 | try { 32 | console.log("Attempting to load:", SAVE_PATH); 33 | const file = Bun.file(SAVE_PATH); 34 | const exists = await file.exists(); 35 | 36 | if (exists) { 37 | console.log("File exists, loading..."); 38 | const buffer = await file.arrayBuffer(); 39 | console.log("Buffer loaded, size:", buffer.byteLength); 40 | 41 | // Skip BMP headers (14 + 40 bytes) and color palette (16 bytes) 42 | const pixelData = Buffer.from(buffer.slice(70)); 43 | const stride = Math.ceil(CANVAS_WIDTH / 4); 44 | 45 | // Create RGBA buffer 46 | const imageData = ctx.createImageData(CANVAS_WIDTH, CANVAS_HEIGHT); 47 | 48 | // Color palette (matches the one used in save) 49 | const palette = [ 50 | { r: 255, g: 255, b: 255, a: 255 }, // White 51 | { r: 0, g: 0, b: 0, a: 255 }, // Black 52 | { r: 255, g: 0, b: 0, a: 255 }, // Red 53 | { r: 0, g: 0, b: 0, a: 0 }, // Unused 54 | ]; 55 | 56 | // Convert 2-bit indexed color back to RGBA 57 | for (let y = 0; y < CANVAS_HEIGHT; y++) { 58 | for (let x = 0; x < CANVAS_WIDTH; x++) { 59 | const byteIndex = Math.floor(x / 4) + y * stride; 60 | const bitPosition = (3 - (x % 4)) * 2; 61 | const colorIndex = (pixelData[byteIndex] >> bitPosition) & 0b11; 62 | 63 | const i = (y * CANVAS_WIDTH + x) * 4; 64 | const color = palette[colorIndex]; 65 | 66 | imageData.data[i] = color.r; // R 67 | imageData.data[i + 1] = color.g; // G 68 | imageData.data[i + 2] = color.b; // B 69 | imageData.data[i + 3] = color.a; // A 70 | } 71 | } 72 | 73 | ctx.putImageData(imageData, 0, 0); 74 | console.log("Drawing complete"); 75 | } else { 76 | console.log("No existing drawing file found"); 77 | } 78 | } catch (e) { 79 | console.error("Error loading existing drawing:", e); 80 | console.log("Starting with blank canvas"); 81 | } 82 | 83 | if (process.env.CLEAR_CRON) { 84 | new CronJob( 85 | process.env.CLEAR_CRON, 86 | () => { 87 | console.log("Clearing drawing..."); 88 | handleClear(); 89 | }, 90 | null, 91 | true 92 | ); 93 | } 94 | } catch (e) { 95 | console.error("Failed to initialize:", e); 96 | } 97 | }; 98 | 99 | initialize(); 100 | 101 | const createBmpBuffer = (imageData: ImageData) => { 102 | // Create color palette (4 colors: white, black, red, unused) 103 | const palette = Buffer.alloc(16); // 4 colors * 4 bytes (BGRA) 104 | // White 105 | palette.writeUInt32LE(0xffffffff, 0); 106 | // Black 107 | palette.writeUInt32LE(0xff000000, 4); 108 | // Red 109 | palette.writeUInt32LE(0xffff0000, 8); 110 | // Unused (transparent) 111 | palette.writeUInt32LE(0xffffff00, 12); 112 | 113 | // Convert RGBA pixels to 2-bit indexed color 114 | const stride = Math.ceil(CANVAS_WIDTH / 4); // 4 pixels per byte 115 | const pixelData = Buffer.alloc(stride * CANVAS_HEIGHT); 116 | 117 | for (let y = 0; y < CANVAS_HEIGHT; y++) { 118 | for (let x = 0; x < CANVAS_WIDTH; x++) { 119 | const i = (y * CANVAS_WIDTH + x) * 4; 120 | const r = imageData.data[i]; 121 | const g = imageData.data[i + 1]; 122 | const b = imageData.data[i + 2]; 123 | 124 | // Determine closest color (0=white, 1=black, 2=red, 3=unused) 125 | let colorIndex; 126 | // Find closest color by checking which has smallest difference 127 | const whiteDistance = 128 | Math.abs(r - 255) + Math.abs(g - 255) + Math.abs(b - 255); 129 | const redDistance = Math.abs(r - 255) + Math.abs(g - 0) + Math.abs(b - 0); 130 | const blackDistance = Math.abs(r - 0) + Math.abs(g - 0) + Math.abs(b - 0); 131 | 132 | if (whiteDistance <= redDistance && whiteDistance <= blackDistance) { 133 | colorIndex = 0; // White is closest 134 | } else if (redDistance <= blackDistance) { 135 | colorIndex = 2; // Red is closest 136 | } else { 137 | colorIndex = 1; // Black is closest 138 | } 139 | 140 | // Calculate position in output buffer 141 | const byteIndex = Math.floor(x / 4) + y * stride; 142 | const bitPosition = (3 - (x % 4)) * 2; 143 | 144 | // Set 2 bits for this pixel 145 | pixelData[byteIndex] |= colorIndex << bitPosition; 146 | } 147 | } 148 | 149 | // Create BMP headers 150 | const bmpHeader = Buffer.alloc(14); 151 | bmpHeader.write("BM", 0); 152 | bmpHeader.writeUInt32LE(14 + 40 + 16 + pixelData.length, 2); // Total size 153 | bmpHeader.writeUInt32LE(14 + 40 + 16, 10); // Offset to pixel data 154 | 155 | const dibHeader = Buffer.alloc(40); 156 | dibHeader.writeUInt32LE(40, 0); // DIB header size 157 | dibHeader.writeInt32LE(CANVAS_WIDTH, 4); 158 | dibHeader.writeInt32LE(-CANVAS_HEIGHT, 8); // Negative for top-down 159 | dibHeader.writeUInt16LE(1, 12); // Color planes 160 | dibHeader.writeUInt16LE(2, 14); // Bits per pixel (2 bits = 4 colors) 161 | dibHeader.writeUInt32LE(0, 16); // No compression 162 | dibHeader.writeUInt32LE(pixelData.length, 20); 163 | dibHeader.writeUInt32LE(0, 24); // X pixels per meter 164 | dibHeader.writeUInt32LE(0, 28); // Y pixels per meter 165 | dibHeader.writeUInt32LE(4, 32); // Number of colors in palette 166 | dibHeader.writeUInt32LE(0, 36); // Important colors 167 | 168 | return Buffer.concat([bmpHeader, dibHeader, palette, pixelData]); 169 | }; 170 | 171 | const saveDrawing = async () => { 172 | try { 173 | const imageData = ctx.getImageData(0, 0, CANVAS_WIDTH, CANVAS_HEIGHT); 174 | const bmpBuffer = createBmpBuffer(imageData); 175 | await Bun.write(SAVE_PATH, bmpBuffer); 176 | } catch (e) { 177 | console.error("Failed to save drawing:", e); 178 | } 179 | }; 180 | 181 | const throttledSave = () => { 182 | const now = Date.now(); 183 | 184 | if (saveTimeout) { 185 | clearTimeout(saveTimeout); 186 | saveTimeout = null; 187 | } 188 | 189 | if (now - lastSave >= SAVE_THROTTLE) { 190 | saveDrawing(); 191 | lastSave = now; 192 | } else { 193 | saveTimeout = setTimeout(() => { 194 | saveDrawing(); 195 | lastSave = Date.now(); 196 | }, SAVE_THROTTLE) as unknown as NodeJS.Timeout; 197 | } 198 | }; 199 | 200 | const handleClear = () => { 201 | ctx.fillStyle = "#ffffff"; 202 | ctx.fillRect(0, 0, CANVAS_WIDTH, CANVAS_HEIGHT); 203 | throttledSave(); 204 | }; 205 | 206 | // Create a function to broadcast the current state 207 | const broadcastState = () => { 208 | const pngBuffer = canvas.toBuffer("image/png"); 209 | server.publish( 210 | "drawing", 211 | JSON.stringify({ 212 | type: "init", 213 | image: pngBuffer.toString("base64"), 214 | }) 215 | ); 216 | }; 217 | 218 | // Set up periodic broadcast 219 | setInterval(broadcastState, 5000); 220 | 221 | const server = Bun.serve({ 222 | port: 3001, 223 | fetch(req) { 224 | const url = new URL(req.url); 225 | 226 | if (url.pathname === "/ws") { 227 | const upgraded = server.upgrade(req); 228 | if (!upgraded) { 229 | return new Response("Upgrade failed", { status: 400 }); 230 | } 231 | return; 232 | } else if (url.pathname === "/drawing.bmp") { 233 | const imageData = ctx.getImageData(0, 0, CANVAS_WIDTH, CANVAS_HEIGHT); 234 | const bmpBuffer = createBmpBuffer(imageData); 235 | 236 | return new Response(bmpBuffer, { 237 | headers: { 238 | "Content-Type": "image/bmp", 239 | "Content-Disposition": "attachment; filename=drawing.bmp", 240 | }, 241 | }); 242 | } else if (url.pathname === "/health") { 243 | return new Response("OK"); 244 | } 245 | 246 | return new Response("Bun WebSocket Server"); 247 | }, 248 | websocket: { 249 | open(ws) { 250 | ws.subscribe("drawing"); 251 | 252 | // Send initial state to new client 253 | const pngBuffer = canvas.toBuffer("image/png"); 254 | ws.send( 255 | JSON.stringify({ 256 | type: "init", 257 | image: pngBuffer.toString("base64"), 258 | }) 259 | ); 260 | }, 261 | message(ws, message) { 262 | const data = JSON.parse(message.toString()) as CanvasAction; 263 | 264 | // Update server-side canvas 265 | switch (data.type) { 266 | case "draw": 267 | if ( 268 | !Object.values(colors).includes(data.color) || 269 | !Object.values(brushSizes).includes(data.brushSize) 270 | ) 271 | return; 272 | draw(brush, data.points, data.color, data.brushSize); 273 | throttledSave(); 274 | break; 275 | case "fill": 276 | if (!Object.values(colors).includes(data.color)) return; 277 | fill( 278 | ctx as unknown as CanvasRenderingContext2D, 279 | CANVAS_WIDTH, 280 | CANVAS_HEIGHT, 281 | data.x, 282 | data.y, 283 | data.color 284 | ); 285 | throttledSave(); 286 | break; 287 | case "clear": 288 | handleClear(); 289 | break; 290 | } 291 | 292 | // Broadcast to all clients 293 | ws.publish("drawing", message); 294 | }, 295 | close(ws) { 296 | ws.unsubscribe("drawing"); 297 | }, 298 | }, 299 | }); 300 | 301 | console.log(`WebSocket server listening on port ${server.port}`); 302 | -------------------------------------------------------------------------------- /src/App.tsx: -------------------------------------------------------------------------------- 1 | import { useEffect, useRef, useState } from "react"; 2 | import { Card } from "@/components/ui/card"; 3 | import { Button } from "@/components/ui/button"; 4 | import { PaintBucket } from "lucide-react"; 5 | import { 6 | Dialog, 7 | DialogContent, 8 | DialogDescription, 9 | DialogFooter, 10 | DialogHeader, 11 | DialogTitle, 12 | } from "@/components/ui/dialog"; 13 | import PxBrush from "../shared/PxBrush"; 14 | import { CanvasAction } from "../shared/Actions"; 15 | import { fill, draw, colors, brushSizes } from "../shared/Utilities"; 16 | 17 | const DrawingApp = () => { 18 | const [tool, setTool] = useState("brush-medium"); 19 | const [color, setColor] = useState(colors.black); 20 | const [showClearConfirm, setShowClearConfirm] = useState(false); 21 | const [isDisconnected, setIsDisconnected] = useState(false); 22 | const canvasRef = useRef(null); 23 | const isDrawingRef = useRef(false); 24 | const wsRef = useRef(null); 25 | const currentLineRef = useRef<{ x: number; y: number }[]>([]); 26 | const brushRef = useRef(null); 27 | const disconnectTimeoutRef = useRef(undefined); 28 | const reconnectTimeoutRef = useRef(undefined); 29 | const reconnectAttemptsRef = useRef(0); 30 | const MAX_RECONNECT_ATTEMPTS = 5; 31 | const INITIAL_RECONNECT_DELAY = 1000; 32 | 33 | const connectWebSocket = () => { 34 | if (wsRef.current && wsRef.current.readyState !== WebSocket.CLOSED) { 35 | return wsRef.current; 36 | } 37 | 38 | if (disconnectTimeoutRef.current) { 39 | clearTimeout(disconnectTimeoutRef.current); 40 | } 41 | 42 | disconnectTimeoutRef.current = setTimeout(() => { 43 | setIsDisconnected(true); 44 | }, 500); 45 | 46 | console.log("Connecting to WebSocket server..."); 47 | 48 | const ws = new WebSocket( 49 | `${window.location.protocol === "https:" ? "wss:" : "ws:"}//${window.location.host 50 | }/ws` 51 | ); 52 | 53 | ws.onopen = () => { 54 | console.log("Connected to WebSocket server"); 55 | clearTimeout(disconnectTimeoutRef.current); 56 | reconnectAttemptsRef.current = 0; 57 | setIsDisconnected(false); 58 | clearTimeout(reconnectTimeoutRef.current); 59 | }; 60 | 61 | ws.onclose = () => { 62 | console.log("WebSocket connection closed"); 63 | if (wsRef.current !== ws) return; 64 | wsRef.current = null; 65 | setIsDisconnected(true); 66 | 67 | // Only attempt reconnection if we haven't exceeded max attempts 68 | if (reconnectAttemptsRef.current < MAX_RECONNECT_ATTEMPTS) { 69 | const delay = INITIAL_RECONNECT_DELAY * Math.pow(2, reconnectAttemptsRef.current); 70 | console.log(`Attempting to reconnect in ${delay}ms...`); 71 | 72 | reconnectTimeoutRef.current = setTimeout(() => { 73 | reconnectAttemptsRef.current++; 74 | connectWebSocket(); 75 | }, delay); 76 | } 77 | }; 78 | 79 | ws.onerror = (error) => { 80 | console.error("WebSocket error:", error); 81 | }; 82 | 83 | wsRef.current = ws; 84 | return ws; 85 | }; 86 | 87 | useEffect(() => { 88 | const canvas = canvasRef.current!; 89 | brushRef.current = new PxBrush(canvas); 90 | 91 | // Initialize canvas with white background 92 | clearCanvas(); 93 | 94 | // Create WebSocket connection 95 | const ws = connectWebSocket(); 96 | 97 | return () => { 98 | // Clear any pending reconnection attempts 99 | clearTimeout(reconnectTimeoutRef.current); 100 | ws.close(); 101 | wsRef.current = null; 102 | }; 103 | }, []); 104 | 105 | const clearCanvas = () => { 106 | const canvas = canvasRef.current!; 107 | const context = canvas.getContext("2d")!; 108 | context.fillStyle = colors.white; 109 | context.fillRect(0, 0, canvas.width, canvas.height); 110 | }; 111 | 112 | const handleClear = () => { 113 | setShowClearConfirm(true); 114 | }; 115 | 116 | const confirmClear = () => { 117 | clearCanvas(); 118 | sendUpdate({ 119 | type: "clear", 120 | }); 121 | setShowClearConfirm(false); 122 | }; 123 | 124 | const sendUpdate = (updateData: CanvasAction) => { 125 | if (wsRef.current) { 126 | wsRef.current.send(JSON.stringify(updateData)); 127 | } 128 | }; 129 | 130 | const getCoordinates = (e: React.MouseEvent | React.TouchEvent) => { 131 | let offsetX = 0, 132 | offsetY = 0; 133 | const target = e.target as HTMLCanvasElement; 134 | if (e.nativeEvent instanceof MouseEvent) { 135 | // Mouse event 136 | const rect = target.getBoundingClientRect(); 137 | offsetX = e.nativeEvent.clientX - rect.left; 138 | offsetY = e.nativeEvent.clientY - rect.top; 139 | } else { 140 | // Touch event 141 | const rect = target.getBoundingClientRect(); 142 | offsetX = e.nativeEvent.touches[0].clientX - rect.left; 143 | offsetY = e.nativeEvent.touches[0].clientY - rect.top; 144 | } 145 | 146 | // Scale coordinates 147 | offsetX /= target.clientWidth / 800; 148 | offsetY /= target.clientHeight / 480; 149 | return { 150 | x: Math.round(offsetX), 151 | y: Math.round(offsetY), 152 | }; 153 | }; 154 | 155 | const startDrawing = (e: React.MouseEvent | React.TouchEvent) => { 156 | if (!(e.nativeEvent instanceof MouseEvent)) { 157 | if (e.nativeEvent.touches && e.nativeEvent.touches.length > 1) return; 158 | } 159 | isDrawingRef.current = true; 160 | const { x, y } = getCoordinates(e); 161 | currentLineRef.current = [{ x, y }]; 162 | }; 163 | 164 | const drawing = (e: React.MouseEvent | React.TouchEvent) => { 165 | if (!isDrawingRef.current) return; 166 | if (tool === "fill") return; 167 | if (!(e.nativeEvent instanceof MouseEvent)) { 168 | if (e.nativeEvent.touches && e.nativeEvent.touches.length > 1) return; 169 | } 170 | 171 | try { 172 | e.preventDefault(); 173 | } catch { 174 | // prevent default doesn't work on touch events 175 | } 176 | 177 | const { x, y } = getCoordinates(e); 178 | 179 | brushRef.current?.draw({ 180 | from: currentLineRef.current[currentLineRef.current.length - 1], 181 | to: { x, y }, 182 | color: color, 183 | size: brushSizes[tool], 184 | }); 185 | 186 | currentLineRef.current = [...currentLineRef.current, { x, y }]; 187 | }; 188 | 189 | const endDrawing = () => { 190 | if (!isDrawingRef.current) return; 191 | if (tool === "fill") return; 192 | isDrawingRef.current = false; 193 | 194 | if (currentLineRef.current.length > 0) { 195 | if (currentLineRef.current.length === 1) { 196 | // Draw a single point 197 | brushRef.current?.draw({ 198 | from: currentLineRef.current[0], 199 | to: currentLineRef.current[0], 200 | color: color, 201 | size: brushSizes[tool], 202 | }); 203 | } 204 | sendUpdate({ 205 | type: "draw", 206 | points: currentLineRef.current, 207 | color: color, 208 | brushSize: brushSizes[tool], 209 | }); 210 | } 211 | 212 | currentLineRef.current = []; 213 | }; 214 | 215 | const handleFill = (e: React.MouseEvent | React.TouchEvent) => { 216 | if (tool !== "fill") return; 217 | 218 | const { x, y } = getCoordinates(e); 219 | 220 | floodFill(x, y, color); 221 | 222 | sendUpdate({ 223 | type: "fill", 224 | x, 225 | y, 226 | color: color, 227 | }); 228 | }; 229 | 230 | const floodFill = (startX: number, startY: number, fillColor: string) => { 231 | const canvas = canvasRef.current!; 232 | const context = canvas.getContext("2d")!; 233 | fill(context, canvas.width, canvas.height, startX, startY, fillColor); 234 | }; 235 | 236 | const drawLine = ( 237 | points: { x: number; y: number }[], 238 | color: string, 239 | brushSize: number 240 | ) => { 241 | draw(brushRef.current!, points, color, brushSize); 242 | }; 243 | 244 | // eslint-disable-next-line react-hooks/exhaustive-deps 245 | const handleDrawingUpdate = ( 246 | data: CanvasAction, 247 | context: CanvasRenderingContext2D 248 | ) => { 249 | switch (data.type) { 250 | case "init": { 251 | // Load the initial canvas state 252 | const img = new Image(); 253 | img.onload = () => { 254 | context.drawImage(img, 0, 0); 255 | // Redraw current line if one is in progress 256 | if (currentLineRef.current.length > 0 && tool !== "fill") { 257 | drawLine(currentLineRef.current, color, brushSizes[tool]); 258 | } 259 | }; 260 | img.src = `data:image/png;base64,${data.image}`; 261 | break; 262 | } 263 | case "draw": { 264 | drawLine(data.points, data.color, data.brushSize); 265 | break; 266 | } 267 | case "fill": 268 | floodFill(data.x, data.y, data.color); 269 | break; 270 | case "clear": 271 | clearCanvas(); 272 | break; 273 | } 274 | }; 275 | 276 | useEffect(() => { 277 | if (wsRef.current) { 278 | wsRef.current.onmessage = (event) => { 279 | const data = JSON.parse(event.data); 280 | const canvas = canvasRef.current!; 281 | const context = canvas.getContext("2d")!; 282 | handleDrawingUpdate(data, context); 283 | }; 284 | } 285 | }, [handleDrawingUpdate]); 286 | 287 | return ( 288 |

289 |

290 |

291 | 🎉 {import.meta.env.VITE_WEB_TITLE} 292 |

293 |

294 |

295 | {Object.entries(brushSizes).map(([toolType, toolSize]) => { 296 | return ( 297 | 313 | ); 314 | })} 315 | 324 |

325 | 326 |

327 | {Object.entries(colors).map(([name, colorValue]) => ( 328 |

340 | 341 | 344 |

345 |

346 | 347 |

387 | 388 | 410 | 411 | 433 |

434 | ); 435 | }; 436 | 437 | export default DrawingApp; 438 | -------------------------------------------------------------------------------- /3d-files/back.step: -------------------------------------------------------------------------------- 1 | ISO-10303-21; 2 | HEADER; 3 | /* Generated by software containing ST-Developer 4 | * from STEP Tools, Inc. (www.steptools.com) 5 | */ 6 | 7 | FILE_DESCRIPTION( 8 | /* description */ ('', 9 | 'CAx-IF Rec.Pracs.---Representation and Presentation of Product Manufa 10 | cturing Information (PMI)---4.0---2014-10-13'), 11 | /* implementation_level */ '2;1'); 12 | 13 | FILE_NAME( 14 | /* name */ 'back.step', 15 | /* time_stamp */ '2025-01-26T21:29:15-08:00', 16 | /* author */ (''), 17 | /* organization */ (''), 18 | /* preprocessor_version */ 'ST-DEVELOPER v20', 19 | /* originating_system */ 'Autodesk Translation Framework v13.20.0.188', 20 | 21 | /* authorisation */ ''); 22 | 23 | FILE_SCHEMA (('AP242_MANAGED_MODEL_BASED_3D_ENGINEERING_MIM_LF { 1 0 10303 442 1 1 4 }')); 24 | ENDSEC; 25 | 26 | DATA; 27 | #10=MECHANICAL_DESIGN_GEOMETRIC_PRESENTATION_REPRESENTATION('',(#13),#459); 28 | #11=SHAPE_REPRESENTATION_RELATIONSHIP('SRR','None',#466,#12); 29 | #12=ADVANCED_BREP_SHAPE_REPRESENTATION('',(#14),#458); 30 | #13=STYLED_ITEM('',(#475),#14); 31 | #14=MANIFOLD_SOLID_BREP('Body1',#271); 32 | #15=FACE_BOUND('',#48,.T.); 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