Added debug sound on position changed in WP8

src/wp8/BackgroundGeoLocation.cs

 using System;
-using System.Windows;
 using Windows.Devices.Geolocation; 
 using WPCordovaClassLib.Cordova;
 using WPCordovaClassLib.Cordova.Commands;
@@ -28,20 +27,21 @@ namespace Cordova.Extension.Commands
 
         public BackgroundGeoLocation()
         {
-            this.IsConfiguring = false;
-            this.IsConfigured = false;
+            IsConfiguring = false;
+            IsConfigured = false;
+
         }
 
         public void configure(string args)
         {
-            this.IsConfiguring = true;
-            this.ConfigureCallbackToken = CurrentCommandCallbackId;
+            IsConfiguring = true;
+            ConfigureCallbackToken = CurrentCommandCallbackId;
             RunningInBackground = false;
 
             BackgroundGeoLocationOptions = this.ParseBackgroundGeoLocationOptions(args);
 
-            this.IsConfigured = BackgroundGeoLocationOptions.ParsingSucceeded;
-            this.IsConfiguring = false;
+            IsConfigured = BackgroundGeoLocationOptions.ParsingSucceeded;
+            IsConfiguring = false;
         }
 
         private BackgroundGeoLocationOptions ParseBackgroundGeoLocationOptions(string configureArgs)
@@ -51,11 +51,11 @@ namespace Cordova.Extension.Commands
             var options = JsonHelper.Deserialize<string[]>(configureArgs);
             var customParameters = JsonHelper.Deserialize<BackgroundGeoLocationOptionsParameters>(options[0]);
 
-            var stationaryRadius = 0.0;
-            var distanceFilter = 0.0;
-            UInt32 locationTimeout = 0;
-            UInt32 desiredAccuracy = 0;
-            var debug = false;
+            double stationaryRadius;
+            double distanceFilter;
+            UInt32 locationTimeout;
+            UInt32 desiredAccuracy;
+            bool debug;
 
             if (!double.TryParse(options[3], out stationaryRadius))
             {
@@ -140,21 +140,24 @@ namespace Cordova.Extension.Commands
             RunningInBackground = true;
 
             DispatchCommandResult(new PluginResult(PluginResult.Status.OK));
-
         }
 
-        private void OnGeolocatorOnPositionChanged(Geolocator sender, PositionChangedEventArgs ConfigureCallbackTokenargs)
+        private void OnGeolocatorOnPositionChanged(Geolocator sender, PositionChangedEventArgs configureCallbackTokenargs)
         {
-            if (Geolocator.LocationStatus == PositionStatus.Disabled ||
-              Geolocator.LocationStatus == PositionStatus.NotAvailable)
+            if (Geolocator.LocationStatus == PositionStatus.Disabled || Geolocator.LocationStatus == PositionStatus.NotAvailable)
             {
-                DispatchMessage(PluginResult.Status.ERROR, string.Format("Cannot start: LocationStatus/PositionStatus: {0}! {1}", Geolocator.LocationStatus, IsConfigured), true, this.ConfigureCallbackToken);
+                DispatchMessage(PluginResult.Status.ERROR, string.Format("Cannot start: LocationStatus/PositionStatus: {0}! {1}", Geolocator.LocationStatus, IsConfigured), true, ConfigureCallbackToken);
                 return;
             }
 
-            var callbackJsonResult = ConfigureCallbackTokenargs.Position.Coordinate.ToJson();
+            var callbackJsonResult = configureCallbackTokenargs.Position.Coordinate.ToJson();
+            if (BackgroundGeoLocationOptions.Debug)
+            {
+                DebugAudioNotifier.GetDebugAudioNotifier().PlaySound(DebugAudioNotifier.Tone.High, TimeSpan.FromSeconds(3));
                 Debug.WriteLine("PositionChanged token{0}, Coordinates: {1}", ConfigureCallbackToken, callbackJsonResult);
-            DispatchMessage(PluginResult.Status.OK, callbackJsonResult, true, this.ConfigureCallbackToken);
+            }
+
+            DispatchMessage(PluginResult.Status.OK, callbackJsonResult, true, ConfigureCallbackToken);
         } 
 
         public void stop()
@@ -173,7 +176,7 @@ namespace Cordova.Extension.Commands
 
         public void finish()
         {
-            throw new NotImplementedException();
+            DispatchCommandResult(new PluginResult(PluginResult.Status.NO_RESULT));
         }
 
         public void onPaceChange(bool isMoving)
@@ -192,10 +195,10 @@ namespace Cordova.Extension.Commands
 
             var options = JsonHelper.Deserialize<string[]>(setConfigArgs);
 
-            var stationaryRadius = 0.0;
-            var distanceFilter = 0.0;
-            UInt32 locationTimeout = 0;
-            UInt32 desiredAccuracy = 0;
+            double stationaryRadius;
+            double distanceFilter;
+            UInt32 locationTimeout;
+            UInt32 desiredAccuracy;
 
             if (!double.TryParse(options[0], out stationaryRadius))
             {
@@ -238,5 +241,4 @@ namespace Cordova.Extension.Commands
             DispatchCommandResult(pluginResult, callBackId);
         }
     }
-
 }

src/wp8/DebugAudioNotifier.cs

+using System;
+using System.Windows;
+using System.Windows.Threading;
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Audio;
+
+namespace Cordova.Extension.Commands
+{
+    public class DebugAudioNotifier : IDisposable
+    {
+        private static DebugAudioNotifier _audioNotifier;
+
+        private DynamicSoundEffectInstance _dynamicSound;
+        private DispatcherTimer _timer;
+        private TimeSpan _timeLeft;
+
+        private const int SampleRate = 48000;
+        private Tone _frequency = Tone.Low;
+
+        private int _bufferSize;
+        private byte[] _soundBuffer;
+        private int _totalTime;
+
+
+        public enum Tone
+        {
+            Low = 300,
+            High = 900
+        }
+
+        private DebugAudioNotifier()
+        {
+
+        }
+
+        public static DebugAudioNotifier GetDebugAudioNotifier()
+        {
+            return _audioNotifier ?? (_audioNotifier = new DebugAudioNotifier());
+        }
+
+        public void PlaySound(Tone tone, TimeSpan duration)
+        {
+            Deployment.Current.Dispatcher.BeginInvoke(() =>
+            {
+                if (_timer == null)
+                {
+                    _timer = new DispatcherTimer
+                    {
+                        Interval = TimeSpan.FromMilliseconds(33)
+                    };
+                    _timer.Tick += delegate { try { FrameworkDispatcher.Update(); } catch { } };
+                }
+
+                if (_timer.IsEnabled) _timer.Stop();
+
+                _timeLeft = duration;
+
+                FrameworkDispatcher.Update();
+                _frequency = tone;
+                _dynamicSound = new DynamicSoundEffectInstance(SampleRate, AudioChannels.Mono);
+                _dynamicSound.BufferNeeded += dynamicSound_BufferNeeded;
+                _dynamicSound.Play();
+                _bufferSize = _dynamicSound.GetSampleSizeInBytes(TimeSpan.FromSeconds(1));
+                _soundBuffer = new byte[_bufferSize];
+
+                _timer.Start();
+            });
+        }
+
+        private void dynamicSound_BufferNeeded(object sender, EventArgs e)
+        {
+            for (var i = 0; i < _bufferSize - 1; i += 2)
+            {
+                var time = _totalTime / (double)SampleRate;
+                var sample = (short)(Math.Sin(2 * Math.PI * (int)_frequency * time) * short.MaxValue);
+                _soundBuffer[i] = (byte)sample;
+                _soundBuffer[i + 1] = (byte)(sample >> 8);
+                _totalTime++;
+            }
+            _timeLeft = _timeLeft.Subtract(TimeSpan.FromSeconds(_totalTime / SampleRate));
+            if (_timeLeft.Ticks <= 0)
+            {
+                _totalTime = 0;
+                return;
+            }
+
+            _dynamicSound.SubmitBuffer(_soundBuffer);
+        }
+
+        public void Dispose()
+        {
+            _dynamicSound.Dispose();
+        }
+    }
+}
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