Merge pull request yonahforst#6 from zsajjad/PerpendicularHeading

[Android] Corrected heading for perpendicular device

Author: yonahforst

android/src/main/java/com/joshblour/reactnativeheading/ReactNativeHeadingModule.java

@@ -36,7 +36,8 @@ public class ReactNativeHeadingModule extends ReactContextBaseJavaModule impleme
 
     private static Context mApplicationContext;
     private int mAzimuth = 0; // degree
-    private int mFilter = 5;
+    private int newAzimuth = 0; // degree
+    private float mFilter = 5;
     private SensorManager mSensorManager;
     private Sensor mSensor;
     private float[] orientation = new float[3];
@@ -82,21 +83,21 @@ public void onSensorChanged(SensorEvent event) {
             // calculate th rotation matrix
             SensorManager.getRotationMatrixFromVector(rMat, event.values);
             // get the azimuth value (orientation[0]) in degree
-            int newAzimuth = (int) ( Math.toDegrees( SensorManager.getOrientation( rMat, orientation )[0] ) + 360 ) % 360;
-
+            newAzimuth = (((( Math.toDegrees( SensorManager.getOrientation( rMat, orientation )[0] ) + 360 ) % 360) -
+                          ( Math.toDegrees( SensorManager.getOrientation( rMat, orientation )[2] ))) +360) % 360;
             //dont react to changes smaller than the filter value
             if (Math.abs(mAzimuth - newAzimuth) < mFilter) {
                 return;
             }
 
-            mAzimuth = newAzimuth;
-            Log.e("TAG", String.valueOf(newAzimuth));
-            WritableMap params = Arguments.createMap();
-            params.putInt("heading", mAzimuth);
-
             getReactApplicationContext()
                     .getJSModule(DeviceEventManagerModule.RCTDeviceEventEmitter.class)
-                    .emit("headingUpdated", params);
+                    .emit("headingUpdated", (int) newAzimuth);
+
+            mAzimuth = newAzimuth;
+            // Log.e("Azimuth",
+            //   String.valueOf(newAzimuth));
+            //
         }
     }