gun
Version:
A realtime, decentralized, offline-first, graph data synchronization engine.
183 lines (176 loc) • 6.47 kB
HTML
<html>
<head>
<title>Where</title>
<meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" name="viewport" />
<meta charset="utf-8">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/leaflet@1.0.3/dist/leaflet.css"/>
<script src="https://cdn.jsdelivr.net/npm/leaflet@1.0.3/dist/leaflet.js"></script>
</head>
<body>
<div id="map"></div>
<a id="share" class="hide"><div class="stick button">Share</div></a>
<div id="link" class="hide">
<p>Copy and Paste this URL to your friends to share your location:</p>
<center>
<p id="follow">Location sharing not available!</p>
</center>
<p><b>Note</b>: Location may not sync when your device's screen is off or the tab is out of focus. You'd need to install this as an app for that to work.</p>
<center>
<a id="close"><div class="button">Close</div></a>
</center>
</div>
<textarea style="display: none; position: fixed; top: 0; left: 0; width: 100%; height: 5em;" id="debug"></textarea>
<style>
html, body, #map {
margin: 0;
padding: 0;
width: 100%;
height: 100%;
font-family: Arial;
font-size: 16pt;
z-index: 1;
}
.stick {
position: absolute;
bottom: 1em;
right: 1em;
}
.button {
display: inline-block;
padding: 1em;
opacity: .5;
background: blue;
color: white;
z-index: 7;
transition: .25s all;
}
.button:hover {
opacity: 1;
}
.hide {
display: none;
}
#link {
position: absolute;
padding: 1em;
top: 2em;
left: 2em;
right: 2em;
bottom: 2em;
background: white;
overflow: scroll;
z-index: 9;
}
#follow {
background: #EEE;
padding: .5em;
word-wrap: break-word;
}
</style>
<script src="/jquery.js"></script>
<script src="/gun.js"></script>
<script>
function Where(opt, cb){
// a small wrapper around Leaflet for map tracking.
var where = {};
where.opt = opt || {};
where.opt.zoom = where.opt.zoom || {};
where.opt.err = where.opt.err || function(){};
where.map = L.map('map', { zoom: where.opt.zoom.level });
where.opt.tile = where.opt.tile || L.tileLayer('http://{s}.tile.osm.org/{z}/{x}/{y}.png', {
maxZoom: where.opt.zoom.max,
minZoom: where.opt.zoom.min,
detectRetina: true,
attribution: '© <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'
});
where.map.addLayer(where.opt.tile);
where.opt.zoom.ing = where.opt.zoom.ing || function(){
where.opt.zoom.level = where.map.getZoom();
}
where.map.on('zoomstart', where.opt.zoom.ing, where.opt.err);
where.map.on('zoomend', where.opt.zoom.ing, where.opt.err);
where.map.on('zoomlevelschange', where.opt.zoom.ing, where.opt.err);
where.update = function(latlng){
if((+new Date) - where.update.last < 400){
clearTimeout(where.update.to);
where.update.to = setTimeout(function(){
where.update(latlng);
});
return;
}
where.map.setView(latlng, where.opt.zoom.level, {animate: true});
where.marker = where.marker || L.marker().setLatLng(latlng).addTo(where.map);
where.marker.setLatLng(latlng).update();
where.update.last = (+new Date);
}
if(where.opt.track){
where.map.on('locationfound', function(pos){
where.update(pos.latlng);
where.opt.track(pos);
});
where.map.locate({
setView: true,
zoom: where.opt.zoom.level,
watch: where.opt.continuous || true,
timeout: where.opt.timeout || 10000,
maximumAge: where.opt.maximumAge || 0,
enableHighAccuracy: where.opt.enableHighAccuracy || false
});
}
return where;
}
</script>
<script>
;(function(){
// the actual GPS tracking app!
var gun = Gun(location.origin + '/gun');
var gps = {};
gps.opt = {
continuous: true, // get location just once uses `getCurrentPosition()` while continuously uses `watchPosition()`
enableHighAccuracy: true, // HighAccuracy uses more resources, https://developer.mozilla.org/en-US/docs/Web/API/PositionOptions
timeout: 5000, // have this long to get data before erring.
maximumAge: 0, // set to 0 to actually track.
zoom: {max: 18, level: 13, min: 12}
}
function start(){
gps.follow = (window.location.hash || '').slice(1);
if(gps.follow){
gps.where = gps.where || Where(gps.opt);
gps.ref = gun.get('gps/' + gps.follow);
gps.ref.on(function(latlng){
//$('#debug').value = 'track ' + JSON.stringify(latlng);
gps.where.update(latlng);
});
$('#share').addClass("hide");
} else {
document.cookie = 'gps=' + (gps.track = (document.cookie.match(/gps\=(.*?)(\&|$|\;)/i)||[])[1] || Gun.text.random(5)); // trick with cookies!
gps.ref = gun.get('gps/' + gps.track);
gps.opt.track = function(pos){
pos = pos.latlng;
if(gps.follow
|| Gun.time.is() - gps.when < 1000
|| gps.last && gps.last.lat == pos.lat && gps.last.lng == pos.lng){
return; // throttle!
}
gps.when = Gun.time.is();
gps.ref.put(gps.last = pos);
//$('#debug').value = JSON.stringify(gps.last);
}
gps.where = gps.where || Where(gps.opt);
$('#follow').text(("where.gunDB.io/" || (location.origin + location.pathname)) + '#' + gps.track);
$('#share').removeClass("hide");
$('#share').on('click', function(){
$('#link').toggleClass("hide");
});
$('#close').on('click', function(){
$('#link').toggleClass("hide");
});
}
}
start();
window.onhashchange = start;
}());
</script>
</body>
</html>