import { Injectable } from '@angular/core';
import { Observer, Observable } from 'rxjs';


@Injectable()
export class DeviceOrientationService {

   /**
   * Tries HTML5 geolocation.
   *
   * Wraps the Geolocation API into an observable.
   *
   * @return An observable of Bearing
   */
  getCurrentBearing(): Observable<number> {
    return Observable.create((observer: Observer<number>) => {             
        let sensor = new Magnetometer();
        sensor.onreading= (ev:Event) => {
             observer.next(Math.atan2(sensor.y, sensor.x) * (180 / Math.PI));
        };
    });
  }

}