Adolfo Reyna
61 lines
1.5 KiB
JavaScript
61 lines
1.5 KiB
JavaScript
// Server-side code
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const express = require('express');
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const http = require('http');
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const socketIO = require('socket.io');
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const app = express();
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const server = http.createServer(app);
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const io = socketIO(server);
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let interval;
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let tempo = 120; // Initial tempo (beats per minute)
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let startTime; // Start time of the metronome
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io.on('connection', (socket) => {
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console.log('A client connected');
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socket.on('start', () => {
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console.log('Metronome started');
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startTime = Date.now(); // Set the start time
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// Calculate the delay between each beat based on the tempo
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const delay = (60 / tempo) * 1000;
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// Send a beat event to all connected clients at the specified interval
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interval = setInterval(() => {
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const elapsedTime = Date.now() - startTime;
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io.emit('beat', elapsedTime);
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}, delay);
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});
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socket.on('stop', () => {
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console.log('Metronome stopped');
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clearInterval(interval);
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});
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socket.on('tempo', (newTempo) => {
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console.log(`Tempo set to ${newTempo} BPM`);
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tempo = newTempo;
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// If the metronome is already running, restart it with the new tempo
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if (interval) {
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clearInterval(interval);
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const delay = (60 / tempo) * 1000;
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interval = setInterval(() => {
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const elapsedTime = Date.now() - startTime;
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io.emit('beat', elapsedTime);
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}, delay);
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}
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});
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socket.on('disconnect', () => {
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console.log('A client disconnected');
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clearInterval(interval);
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});
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});
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server.listen(3000, () => {
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console.log('Server is running on port 3000');
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});
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return io; |