Tried it myself without success, so here I am.
for the first to deliver a related code(containing the same info present in this one) hosted and working online:
var entities = [], count = 0;
var port = process.env.VCAP_APP_PORT || 5000;
var io = require("socket.io").listen(port);
var usernames = {};
var chat = {};
var rooms = ['room1','room2','room3'];
var INITIAL_X = 6000;
var INITIAL_Y = 5000;
var INITIAL_VEL_X = 0;
var INITIAL_VEL_Y = 0;
// assuming io is the Socket.IO server object
io.configure(function () {
io.set("transports", ["xhr-polling"]);
io.set("polling duration", 10);
io.set('log level', 1);
console.log("The listening port is:" + port)
});
io.sockets.on("connection", function (socket) {
var myNumber = count++;
//assign number
var mySelf = entities[myNumber] = [myNumber, INITIAL_X, INITIAL_Y, INITIAL_VEL_X, INITIAL_VEL_Y, usernames];
//Send the initial position and ID to connecting player
console.log(myNumber + ' sent: ' + 'I,' + mySelf[0] + ',' + mySelf[1] + ',' + mySelf[2]);
socket.send('I,' + mySelf[0] + ',' + mySelf[1] + ',' + mySelf[2]);
// Join room
socket.join('room1');
// store the room name in the socket session for this client
socket.room = 'room1';
//Send to conencting client the current state of all the other players
for (var entity_idx = 0; entity_idx < entities.length; entity_idx++) { //send initial update
if (entity_idx != myNumber) {
entity = entities[entity_idx];
if (typeof (entity) != "undefined" && entity != null) {
console.log(myNumber + ' sent: C for ' + entity_idx);
socket.send('C,' + entity[0] + ',' + entity[1] + ',' + entity[2]); //send the client that just connected the position of all the other clients
}
}
}
//create new entity in all clients
socket.broadcast.emit("message",'C,' + mySelf[0] + ',' + mySelf[1] + ',' + mySelf[2]);
socket.on("message", function (data) {
//if (myNumber == 0)
// console.log(myNumber + ' sent: ' +data);
var new_data = data.split(',');
if (new_data[0] == 'UM') {
mySelf[1] = new_data[1];
mySelf[2] = new_data[2];
mySelf[3] = new_data[3];
mySelf[4] = new_data[4];
mySelf[5] = new_data[5];
mySelf[6] = new_data[6];
mySelf[7] = new_data[7];
//Update all the other clients about my update
socket.broadcast.emit("message",
'UM,' + mySelf[0] + ',' + mySelf[1] + ',' + mySelf[2] + ',' + mySelf[3] + ',' + mySelf[4] + ',' + mySelf[5] + ',' + mySelf[6] + ',' + mySelf[7]);
}
else if (new_data[0] == 'adduser') { // a adduser message
var usernames = {};
usernames[0] = new_data[1];
console.log("message",'adduser,' + mySelf[0] + ',' + usernames[0]);
socket.broadcast.emit("message",
'adduser,' + mySelf[0] + ',' + usernames[0]);
}
else if (new_data[0] == 'chat') { // a chat message
var chat = {};
chat[0] = new_data[1];
console.log("message",'chat,' + mySelf[0] + ',' + chat[0]);
socket.broadcast.emit("message",
'chat,' + mySelf[0] + ',' + chat[0]);
}<font size="5">...</font>