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| $(function() {
// generate unique user id
var userId = Math.random().toString(16).substring(2,15);
var socket = io.connect('/');
var map;
var info = $('#infobox');
var doc = $(document);
// custom marker's icon styles
var tinyIcon = L.Icon.extend({
options: {
shadowUrl: '../public/assets/marker-shadow.png',
iconSize: [25, 39],
iconAnchor: [12, 36],
shadowSize: [41, 41],
shadowAnchor: [12, 38],
popupAnchor: [0, -30]
}
});
var redIcon = new tinyIcon({ iconUrl: '../public/assets/marker-red.png' });
var yellowIcon = new tinyIcon({ iconUrl: '../public/assets/marker-yellow.png' });
var sentData = {};
var connects = {};
var markers = {};
var active = false;
socket.on('load:coords', function(data) {
if (!(data.id in connects)) {
setMarker(data);
}
connects[data.id] = data;
connects[data.id].updated = $.now(); // shothand for (new Date).getTime()
});
// check whether browser supports geolocation api
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(positionSuccess, positionError, {enableHighAccuracy:true});
} else {
$('.map').text('Your browser is out of fashion, there\'s no geolocation!');
}
function positionSuccess(position) {
var lat = position.coords.latitude;
var lng = position.coords.longitude;
var acr = position.coords.accuracy;
// mark user's position
var userMarker = L.marker([lat, lng], {
icon: redIcon
});
// uncomment for static debug
// userMarker = L.marker([51.45, 30.050], { icon: redIcon });
// load leaflet map
map = L.map('map');
// leaflet API key tiler
L.tileLayer('http://{s}.MYMAP/MYMAP/256/{z}/{x}/{y}.png', { maxZoom: 18, detectRetina: true }).addTo(map);
// set map bounds
map.fitWorld();
userMarker.addTo(map);
userMarker.bindPopup('<p>You are there! Your ID is ' + userId + '</p>').openPopup();
var emit = $.now();
// send coords on when user is active
doc.on('mousemove', function() {
active = true;
sentData = {
id: userId,
active: active,
coords: [{
lat: lat,
lng: lng,
acr: acr
}]
};
if ($.now() - emit > 30) {
socket.emit('send:coords', sentData);
emit = $.now();
}
});
}
doc.bind('mouseup mouseleave', function() {
active = false;
});
// showing markers for connections
function setMarker(data) {
for (var i = 0; i < data.coords.length; i++) {
var marker = L.marker([data.coords[i].lat, data.coords[i].lng], { icon: yellowIcon }).addTo(map);
marker.bindPopup('<p>One more external user is here!</p>');
markers[data.id] = marker;
}
}
// handle geolocation api errors
function positionError(error) {
var errors = {
1: 'Authorization fails', // permission denied
2: 'Can\'t detect your location', //position unavailable
3: 'Connection timeout' // timeout
};
showError('Error:' + errors[error.code]);
}
function showError(msg) {
info.addClass('error').text(msg);
doc.click(function() {
info.removeClass('error');
});
}
// delete inactive users every 15 sec
setInterval(function() {
for (var ident in connects){
if ($.now() - connects[ident].updated > 15000) {
delete connects[ident];
map.removeLayer(markers[ident]);
}
}
}, 15000);
}); |
