Sensor-enhanced location provider

Adds a LocationProvider that enhances another LocationProvider with the bearing values of the device rotation sensor. It provides accurate bearing values when the default location provider is unable to do so (commonly due to lack of movement).

Author: jgillich

lib/maplibre-compose/src/androidMain/kotlin/org/maplibre/compose/location/AndroidSensorEnhancedLocationProvider.kt

@@ -44,10 +44,18 @@ public class AndroidSensorEnhancedLocationProvider(
 ) : LocationProvider {
   private val sensorManager = context.getSystemService(SENSOR_SERVICE) as SensorManager
 
+  private fun accuracyToDegrees(accuracy: Int): Double = when (accuracy) {
+    SensorManager.SENSOR_STATUS_ACCURACY_HIGH -> 5.0
+    SensorManager.SENSOR_STATUS_ACCURACY_MEDIUM -> 15.0
+    SensorManager.SENSOR_STATUS_ACCURACY_LOW -> 45.0
+    SensorManager.SENSOR_STATUS_UNRELIABLE -> 180.0
+    else -> 180.0
+  }
+
   private val bearing: Flow<Pair<Double, Double>> = callbackFlow {
     val rotationMatrix = FloatArray(9)
     val orientationAngles = FloatArray(3)
-    var currentAccuracy = SensorManager.SENSOR_STATUS_UNRELIABLE
+    var accuracyDegrees = accuracyToDegrees(SensorManager.SENSOR_STATUS_UNRELIABLE)
 
     val listener = object : SensorEventListener {
       override fun onSensorChanged(event: SensorEvent?) {
@@ -62,21 +70,13 @@ public class AndroidSensorEnhancedLocationProvider(
           )
 
           trySend(
-            Math.toDegrees(orientationAngles[0].toDouble())
-              to
-              when (currentAccuracy) {
-                SensorManager.SENSOR_STATUS_ACCURACY_HIGH -> 5.0
-                SensorManager.SENSOR_STATUS_ACCURACY_MEDIUM -> 15.0
-                SensorManager.SENSOR_STATUS_ACCURACY_LOW -> 45.0
-                SensorManager.SENSOR_STATUS_UNRELIABLE -> 180.0
-                else -> 180.0
-              }
+            Math.toDegrees(orientationAngles[0].toDouble()) to accuracyDegrees
           )
         }
       }
 
       override fun onAccuracyChanged(sensor: Sensor?, accuracy: Int) {
-        currentAccuracy = accuracy
+        accuracyDegrees = accuracyToDegrees(accuracy)
       }
     }