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- //app.js
- var express = require('express');
- var app = express();
- var serv = require('http').Server(app);
- app.get('/',function(req, res) {
- res.sendFile(__dirname + '/client/index.html');
- });
- app.use('/client',express.static(__dirname + '/client'));
- serv.listen(2000);
- console.log("Server started.");
- var SOCKET_LIST = {};
- var io = require('socket.io')(serv,{});
- io.sockets.on('connection', function(socket){
- socket.id = Math.random();
- socket.x = 0;
- socket.y = 0;
- socket.number = "" + Math.floor(10 * Math.random());
- SOCKET_LIST[socket.id] = socket;
- socket.on('disconnect',function(){
- delete SOCKET_LIST[socket.id];
- });
- });
- setInterval(function(){
- var pack = [];
- for(var i in SOCKET_LIST){
- var socket = SOCKET_LIST[i];
- socket.x++;
- socket.y++;
- pack.push({
- x:socket.x,
- y:socket.y,
- number:socket.number
- });
- }
- for(var i in SOCKET_LIST){
- var socket = SOCKET_LIST[i];
- socket.emit('newPositions',pack);
- }
- },1000/25);
- //index.html
- <canvas id="ctx" width="500" height="500" style="border:1px solid #000000;"></canvas>
- <script src="https://cdn.socket.io/socket.io-1.4.5.js"></script>
- <script>
- var ctx = document.getElementById("ctx").getContext("2d");
- ctx.font = '30px Arial';
- var socket = io();
- socket.on('newPositions',function(data){
- ctx.clearRect(0,0,500,500);
- for(var i = 0 ; i < data.length; i++)
- ctx.fillText(data[i].number,data[i].x,data[i].y);
- });
- </script>
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