freifunk-franken
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monitoring
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Code Issues Releases Wiki Activity

normalize lng

This commit is contained in:
Dominik Heidler 2015-09-03 21:33:38 +02:00
parent 3d2db185e3
commit 3d15bed42e
1 changed files with 13 additions and 3 deletions
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16
map/templates/map.html
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@ -56,10 +56,15 @@
var px_per_deg_lng = size_of_world_in_px / 360;
var px_per_deg_lat = size_of_world_in_px / 180;
ajax_get_request("{{ url_for('get_nearest_router') }}?lng=" + pos.latlng.lng + "&lat=" + pos.latlng.lat, function(router) {
// normalize longitude (user can shift map west/east and leave the [-180..180] range
var lng = mod(pos.latlng.lng, 360);
var lat = pos.latlng.lat;
if (lng > 180) { lng -= 360; }
ajax_get_request("{{ url_for('get_nearest_router') }}?lng=" + lng + "&lat=" + lat, function(router) {
// decide if router is close enough
var lng_delta = Math.abs(pos.latlng.lng - router.position.coordinates[0])
var lat_delta = Math.abs(pos.latlng.lat - router.position.coordinates[1])
var lng_delta = Math.abs(lng - router.position.coordinates[0])
var lat_delta = Math.abs(lat - router.position.coordinates[1])
// convert degree distances into px distances on the map
var x_delta_px = lng_delta * px_per_deg_lng;
@ -130,6 +135,11 @@
xmlhttp.open("GET", url, true);
xmlhttp.send();
}
function mod(n, m) {
// use own modulo function (see http://stackoverflow.com/q/4467539)
return ((n % m) + m) % m;
}
</script>
</body>
</html>