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run-geolocation.html
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run-geolocation.html
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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Realtime Positioning</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
<script src="https://api.mapbox.com/mapbox.js/v2.2.1/mapbox.js"></script>
<link href="https://api.mapbox.com/mapbox.js/v2.2.1/mapbox.css" rel="stylesheet" />
<style>
body {
margin:0;
padding:0;
}
#map {
position: absolute;
top:0;
bottom:0;
width:100%;
}
#info_box {
font-family: monospace, sans-serif;
position: absolute;
top:0;
right:0;
padding: 10px;
background-color:
#fff; opacity: 0.5;
}
#note_box {
font-family: monospace, sans-serif;
margin-top: 150px;
padding: 10px;
margin-left: auto;
margin-right: auto;
max-width: 80%;
background-color: #E9FBE9;
color: gray;
}
</style>
<script>
function map(element_id, info_box_id, token) {
var marker = null;
var map = null;
var MIN_CIRCLE_SIZE = 10;
L.mapbox.accessToken = token;
var updateInfoBox = infoBox(info_box_id);
function resolution(latitude, zoomLevel) {
var EARTH_CIRC = 6378137;
return Math.cos(latitude * Math.PI/180) * 2 * Math.PI * EARTH_CIRC / (256 * Math.pow(2, zoomLevel));
}
function circleRadius(accuracy, latitude, zoomLevel) {
var res = resolution(latitude, zoomLevel)
return Math.max(accuracy / res, MIN_CIRCLE_SIZE);
}
return function updateMap(err, coords, accuracy) {
var ZOOM_LEVEL = 17;
updateInfoBox(err, coords, accuracy);
if (err) {
if (marker) {
marker.setStyle({ color: "#999" });
}
} else {
if (map) {
map.panTo(coords);
} else {
map = L.mapbox.map(element_id, 'mapbox.streets').setView(coords, ZOOM_LEVEL);
map.on("zoomend", function() {
if (marker) {
var r = circleRadius(accuracy, coords[0], map.getZoom());
marker.setRadius(r);
}
});
}
if (marker) {
marker.setLatLng(coords);
} else {
marker = L.circleMarker(coords)
map.addLayer(marker);
}
var r = circleRadius(accuracy, coords[0], map.getZoom());
marker.setRadius(r);
marker.setStyle({ color: "#03f" });
}
};
}
function infoBox(element_id) {
var update_count = 0;
var last_updated;
function updateInfoBox(err, coords, accuracy) {
last_updated = Date.now();
update_count++;
var lines = [];
lines.push("Lat: " + (coords ? coords[0] : "…"));
lines.push("Lng: " + (coords ? coords[1] : "…"));
lines.push("Accuracy: " + (accuracy ? accuracy + "m" : "…"));
lines.push(err ? "Error: " + err.message : "");
lines.push("Last update: <span id=last_update>" + displayTimeInterval() + "</span> ago");
lines.push("Update count: " + update_count);
lines.push("<a style='float: right;' href=''>refresh</a>");
document.getElementById(element_id).innerHTML = lines.join("<br>");
}
function updateTimer() {
if (last_updated) {
document.getElementById("last_update").innerHTML = displayTimeInterval(Date.now() - last_updated);
}
requestAnimationFrame(updateTimer);
}
function displayTimeInterval() {
var delta = Date.now() - last_updated
return Math.floor(delta / 1000) + "." + pad(3, delta % 1000) + "s";
}
function pad(length, n) {
n = n + "";
while(n.length < length) {
n = "0" + n;
}
return n;
}
updateTimer();
return updateInfoBox;
}
const updateMap = map('map', 'info_box', 'pk.eyJ1IjoidG9iaWUiLCJhIjoiZDM5NDhkZWFkYjRjNTRlZTc4M2M0NDQ3ZmViMjgwNDUifQ.mtE579d9kCr58yG0sfx7vA');
</script>
<script type="module">
import { GeolocationSensor } from './src/geolocation-sensor.js';
import { AbortController, AbortSignal } from './src/sensor.js';
window.GeolocationSensor = GeolocationSensor;
const sensor = new GeolocationSensor({ accuracy: "low" });
sensor.onreading = () => {
const coords = [sensor.latitude, sensor.longitude];
updateMap(null, coords, sensor.accuracy);
};
sensor.onerror = (error) => {
updateMap(error);
};
let log = console.error;
console.error = (message, ...rest) => {
const div = document.querySelector('#console');
let child = document.createElement('div');
child.innerText = message;
div.appendChild(child);
log.call(console, message, ...rest);
}
window._start = function(target) {
if (!sensor.activated) {
target.innerText = "Stop";
sensor.start();
} else {
target.innerText = "Start";
sensor.stop();
}
}
let controller = null;
window._once = async function(target) {
if (controller) {
controller.abort();
target.innerText = "OneShot";
controller = null;
return;
}
target.innerText = "Cancel OneShot";
controller = new AbortController;
const signal = controller.signal;
try {
const value = await GeolocationSensor.read({ signal });
console.log(value);
target.innerText = "OneShot";
controller = null;
} catch(err) {
console.error(err);
target.innerText = "OneShot";
controller = null;
}
}
</script>
</head>
<body>
<div id="note_box">
<p>
We're using the navigator.permissions.query() API to find out
whether you allow this site to access your location. Use your
browser UI to grant location access to this site if you wish
to experience this example.
</p>
<p>
Chrome: Secure badge > Location > Always allow on this site
</p>
</div>
<div id="map"></div>
<p id="info_box">
<a href="">refresh</a>
<button onclick="_start(this)">Start</button>
<button onclick="_once(this)">OneShot</button>
</p>
<div id="console"></div>
</body>
</html>