diff options
| -rwxr-xr-x | iss_get_data.js | 71 |
1 files changed, 53 insertions, 18 deletions
diff --git a/iss_get_data.js b/iss_get_data.js index 9ba7069..0db03c8 100755 --- a/iss_get_data.js +++ b/iss_get_data.js @@ -70,7 +70,6 @@ const ISS_Above = new GObject.Class({ 'org.freedesktop.GeoClue2', '/org/freedesktop/GeoClue2/Manager'); [this.clientAddr] = this.managerProxy.GetClientSync(); - print('this.clientAddr = ' + this.clientAddr); this.current_location = {}; this.iss_coords = null; @@ -96,7 +95,7 @@ const ISS_Above = new GObject.Class({ let iss_api = Gio.file_new_for_uri(API_URL); iss_api.load_contents_async(null, function(iss_api, result) { self.iss_coords = JSON.parse(iss_api.load_contents_finish(result)[1]); - print(self.iss_coords.toSource()); + // print(self.iss_coords.toSource()); self.emit('processed_data'); }); }, @@ -105,31 +104,67 @@ const ISS_Above = new GObject.Class({ let geoclueLocation = new LocationProxy(Gio.DBus.system, "org.freedesktop.GeoClue2", newPath); - print('location:'); - print('\tlatitude = ' + geoclueLocation.latitude); - print('\tlongitude = ' + geoclueLocation.longitude); - print('\taccuracy = ' + geoclueLocation.accuracy); - print('\tdescription = ' + geoclueLocation.description); - // this.current_location.latitude = geoclueLocation.latitude; - // this.current_location.longitude = geoclueLocation.longitude; - // this.current_location.accuracy = geoclueLocation.accuracy; - // this.current_location.description = geoclueLocation.description; + this.current_location.Latitude = geoclueLocation.Latitude; + this.current_location.Longitude = geoclueLocation.Longitude; + this.current_location.Accuracy = geoclueLocation.Accuracy; + this.current_location.Description = geoclueLocation.Description; this.emit('processed_data'); }, + /** + * Calculate distance in km of two geographical points + * + * @param lat1 Number latitude of the first point + * @param long1 Number longitude of the first point + * @param lat2 Number latitude of the second point + * @param long2 Number longitude of the second point + * @return Number distance in km + * + * Described on https://en.wikipedia.org/wiki/Haversine_formula + */ + get_distance: function(lat1, long1, lat2, long2) { + // Mean radius of the Earth in km + const EARTH_R = 6371; + const PI_180 = Math.PI / 180; + + function haversin(fi) { + return (1 - Math.cos(fi)) / 2; + } + + lat1 = lat1 * PI_180; + long1 = long1 * PI_180; + lat2 = lat2 * PI_180; + long2 = long2 * PI_180; + + let dist = 2 * EARTH_R * + Math.asin(Math.sqrt(haversin(lat2 - lat1) + + Math.cos(lat1) * Math.cos(lat2) * haversin(long2 - long1))); + + let test_haversin = haversin(dist / EARTH_R); + if (test_haversin < 1) { + return dist.toFixed(3); + } + else { + throw new Error('haversine(d/r) cannot be over 1, but it is ' + + test_haversin); + } + }, + processResult: function() { this.task_queue--; - print('this.task_queue = ' + this.task_queue); if (this.task_queue === 0) { - print('location:'); - print('\tlatitude = ' + this.current_location.latitude); - print('\tlongitude = ' + this.current_location.longitude); - print('\taccuracy = ' + this.current_location.accuracy); - print('\tdescription = ' + this.current_location.description); - print('\n\niss coordinates: ' + this.iss_coords.toSource()); + // print('our location: ' + this.current_location.toSource()); + // print('iss coordinates: ' + this.iss_coords.toSource()); + + let dist = this.get_distance(this.current_location.Latitude, + this.current_location.Longitude, + this.iss_coords.iss_position.latitude, + this.iss_coords.iss_position.longitude) + + print('ISS is ' + dist + ' km away.'); Mainloop.quit(); } |