<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<style type="text/css">
html { height: 100% }
body { height: 100%; margin: 0; padding: 0 }
#map_canvas { height: 100% }
</style>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js">
</script>
<script type="text/javascript"
src="https://maps.googleapis.com/maps/api/js?sensor=true">
</script>
<script type="text/javascript">
Map=null;
CenterLat=45.0;
CenterLon=9.0;
Planes={};
function getIconForPlane(plane) {
var r = 255, g = 255, b = 0;
var maxalt = 40000; /* Max altitude in the average case */
var invalt = maxalt-plane.altitude;
if (invalt < 0) invalt = 0;
b = parseInt(255/maxalt*invalt);
return {
strokeWeight: 1,
path: google.maps.SymbolPath.FORWARD_CLOSED_ARROW,
scale: 5,
fillColor: 'rgb('+r+','+g+','+b+')',
fillOpacity: 0.9,
rotation: plane.track
};
}
function fetchData() {
$.getJSON('/data.json', function(data) {
var stillhere = {}
for (var j=0; j < data.length; j++) {
var plane = data[j];
var marker = null;
stillhere[plane.hex] = true;
plane.flight = $.trim(plane.flight);
if (Planes[plane.hex]) {
var myplane = Planes[plane.hex];
marker = myplane.marker;
var icon = marker.getIcon();
var newpos = new google.maps.LatLng(plane.lat, plane.lon);
marker.setPosition(newpos);
marker.setIcon(getIconForPlane(plane));
} else {
marker = new google.maps.Marker({
position: new google.maps.LatLng(plane.lat, plane.lon),
map: Map,
icon: getIconForPlane(plane)
});
plane.marker = marker;
Planes[plane.hex] = plane;
}
if (plane.flight.length == 0)
marker.setTitle(plane.hex)
else
marker.setTitle(plane.flight+' ('+plane.hex+')')
}
/* Remove idle planes. */
for (var p in Planes) {
if (!stillhere[p]) {
Planes[p].marker.setMap(null);
delete Planes[p];
}
}
});
}
function initialize() {
var mapOptions = {
center: new google.maps.LatLng(CenterLat, CenterLon),
zoom: 5,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
Map = new google.maps.Map(document.getElementById("map_canvas"), mapOptions);
/* Setup our timer to poll from the server. */
window.setInterval(function() {
fetchData();
}, 1000);
}
</script>
</head>
<body onload="initialize()">
<div id="map_canvas" style="width:100%; height:100%"></div>
</body>
</html>