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\n {!roomId ? (\n

🎨 Collaborative Whiteboard

\n \n

\n ) : (\n

\n setColor(e.target.value)} \n />\n setLineWidth(Number(e.target.value))} \n />\n \n

Room: {roomId}

\n )}\n \n View Source\n \n

\n \n \n \n \n `, {\n headers: { \"Content-Type\": \"text/html\" }\n });\n}","/** @jsxImportSource https://esm.sh/react@18.2.0 */\nimport React, { useState, useEffect, useRef } from \"https://esm.sh/react@18.2.0\";\nimport { createRoot } from \"https://esm.sh/react-dom@18.2.0/client\";\n\ntype DrawingEvent = {\n x: number;\n y: number;\n color: string;\n lineWidth: number;\n isDrawing: boolean;\n};\n\nfunction Whiteboard() {\n const [roomId, setRoomId] = useState(null);\n const [socket, setSocket] = useState(null);\n const canvasRef = useRef(null);\n const [isDrawing, setIsDrawing] = useState(false);\n const [color, setColor] = useState(\"#000000\");\n const [lineWidth, setLineWidth] = useState(5);\n\n useEffect(() => {\n if (!roomId) return;\n\n const ws = new WebSocket(`wss://ws.val.run/whiteboard/${roomId}`);\n \n ws.onopen = () => {\n console.log(\"Connected to whiteboard\");\n setSocket(ws);\n };\n\n ws.onmessage = (event) => {\n const data: DrawingEvent = JSON.parse(event.data);\n drawOnCanvas(data, false);\n };\n\n return () => {\n ws.close();\n };\n }, [roomId]);\n\n useEffect(() => {\n const canvas = canvasRef.current;\n const context = canvas?.getContext('2d');\n if (!context) return;\n\n context.strokeStyle = color;\n context.lineWidth = lineWidth;\n context.lineCap = 'round';\n }, [color, lineWidth]);\n\n const drawOnCanvas = (event: DrawingEvent, shouldEmit = true) => {\n const canvas = canvasRef.current;\n const context = canvas?.getContext('2d');\n if (!context) return;\n\n if (!event.isDrawing) {\n context.beginPath();\n context.moveTo(event.x, event.y);\n return;\n }\n\n context.lineTo(event.x, event.y);\n context.stroke();\n\n if (shouldEmit && socket) {\n socket.send(JSON.stringify({\n ...event,\n isDrawing: true\n }));\n }\n };\n\n const startDrawing = (e: React.MouseEvent) => {\n const canvas = canvasRef.current;\n if (!canvas) return;\n\n const rect = canvas.getBoundingClientRect();\n const x = e.clientX - rect.left;\n const y = e.clientY - rect.top;\n\n setIsDrawing(true);\n drawOnCanvas({ x, y, color, lineWidth, isDrawing: false });\n };\n\n const draw = (e: React.MouseEvent) => {\n if (!isDrawing) return;\n const canvas = canvasRef.current;\n if (!canvas) return;\n\n const rect = canvas.getBoundingClientRect();\n const x = e.clientX - rect.left;\n const y = e.clientY - rect.top;\n\n drawOnCanvas({ x, y, color, lineWidth, isDrawing: true });\n };\n\n const stopDrawing = () => {\n setIsDrawing(false);\n };\n\n const clearCanvas = () => {\n const canvas = canvasRef.current;\n const context = canvas?.getContext('2d');\n if (context && canvas) {\n context.clearRect(0, 0, canvas.width, canvas.height);\n socket?.send(JSON.stringify({ type: 'clear' }));\n }\n };\n\n return (\n

\n {!roomId ? (\n

🎨 Collaborative Whiteboard

\n \n

\n ) : (\n

\n setColor(e.target.value)} \n />\n setLineWidth(Number(e.target.value))} \n />\n \n

Room: {roomId}

\n )}\n \n View Source\n \n

\n );\n}\n\nfunction client() {\n createRoot(document.getElementById(\"root\")).render();\n}\nif (typeof document !== \"undefined\") { client(); }\n\nexport default async function server(request: Request): Promise {\n const url = new URL(request.url);\n const roomId = url.searchParams.get('room');\n\n // Server-side room validation can be added here if needed\n const { blob } = await import(\"https://esm.town/v/std/blob\");\n const KEY = \"realTimeWhiteboard\";\n\n return new Response(`\n \n \n Collaborative Whiteboard\n \n \n \n \n

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Diff · v2