improved Direction2 code style

CHANGELOG.md

@@ -7,11 +7,15 @@ Jump to version:
 
 ## 5.1.0 (Unreleased)
 ### MLEM
+Additions
+- Added RotateBy to Direction2Helper
+
 Fixes
 - Set default values for InputHandler held and pressed keys to avoid an exception if buttons are held in the very first frame
 
 Improvements
 - Improved NinePatch memory performance
+- Moved sound-related classes into Sound namespace
 
 ### MLEM.Ui
 Fixes

MLEM.Ui/Elements/Element.cs

@@ -10,6 +10,7 @@ using MLEM.Input;
 using MLEM.Misc;
 using MLEM.Textures;
 using MLEM.Ui.Style;
+using SoundEffectInfo = MLEM.Sound.SoundEffectInfo;
 
 namespace MLEM.Ui.Elements {
     /// <summary>

MLEM.Ui/Style/UiStyle.cs

@@ -5,6 +5,7 @@ using MLEM.Formatting;
 using MLEM.Misc;
 using MLEM.Textures;
 using MLEM.Ui.Elements;
+using SoundEffectInfo = MLEM.Sound.SoundEffectInfo;
 
 namespace MLEM.Ui.Style {
     /// <summary>

MLEM/Misc/Direction2.cs

@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Runtime.Serialization;
 using Microsoft.Xna.Framework;
+using static MLEM.Misc.Direction2;
 
 namespace MLEM.Misc {
     /// <summary>
@@ -83,7 +84,10 @@ namespace MLEM.Misc {
         /// <summary>
         /// All directions except <see cref="Direction2.None"/>
         /// </summary>
-        public static readonly Direction2[] AllExceptNone = All.Where(dir => dir != Direction2.None).ToArray();
+        public static readonly Direction2[] AllExceptNone = All.Where(dir => dir != None).ToArray();
+
+        private static readonly Direction2[] Clockwise = {Up, UpRight, Right, DownRight, Down, DownLeft, Left, UpLeft};
+        private static readonly Dictionary<Direction2, int> ClockwiseLookup = Clockwise.Select((d, i) => (d, i)).ToDictionary(kv => kv.d, kv => kv.i);
 
         /// <summary>
         /// Returns if the given direction is considered an "adjacent" direction.
@@ -92,7 +96,7 @@ namespace MLEM.Misc {
         /// <param name="dir">The direction to query</param>
         /// <returns>Whether the direction is adjacent</returns>
         public static bool IsAdjacent(this Direction2 dir) {
-            return dir == Direction2.Up || dir == Direction2.Right || dir == Direction2.Down || dir == Direction2.Left;
+            return dir == Up || dir == Right || dir == Down || dir == Left;
         }
 
         /// <summary>
@@ -101,7 +105,7 @@ namespace MLEM.Misc {
         /// <param name="dir">The direction to query</param>
         /// <returns>Whether the direction is diagonal</returns>
         public static bool IsDiagonal(this Direction2 dir) {
-            return dir == Direction2.UpRight || dir == Direction2.DownRight || dir == Direction2.UpLeft || dir == Direction2.DownLeft;
+            return dir == UpRight || dir == DownRight || dir == UpLeft || dir == DownLeft;
         }
 
         /// <summary>
@@ -112,21 +116,21 @@ namespace MLEM.Misc {
         /// <returns>The direction's offset</returns>
         public static Point Offset(this Direction2 dir) {
             switch (dir) {
-                case Direction2.Up:
+                case Up:
                     return new Point(0, -1);
-                case Direction2.Right:
+                case Right:
                     return new Point(1, 0);
-                case Direction2.Down:
+                case Down:
                     return new Point(0, 1);
-                case Direction2.Left:
+                case Left:
                     return new Point(-1, 0);
-                case Direction2.UpRight:
+                case UpRight:
                     return new Point(1, -1);
-                case Direction2.DownRight:
+                case DownRight:
                     return new Point(1, 1);
-                case Direction2.DownLeft:
+                case DownLeft:
                     return new Point(-1, 1);
-                case Direction2.UpLeft:
+                case UpLeft:
                     return new Point(-1, -1);
                 default:
                     return Point.Zero;
@@ -152,24 +156,24 @@ namespace MLEM.Misc {
         /// <returns>The opposite of the direction</returns>
         public static Direction2 Opposite(this Direction2 dir) {
             switch (dir) {
-                case Direction2.Up:
-                    return Direction2.Down;
-                case Direction2.Right:
-                    return Direction2.Left;
-                case Direction2.Down:
-                    return Direction2.Up;
-                case Direction2.Left:
-                    return Direction2.Right;
-                case Direction2.UpRight:
-                    return Direction2.DownLeft;
-                case Direction2.DownRight:
-                    return Direction2.UpLeft;
-                case Direction2.DownLeft:
-                    return Direction2.UpRight;
-                case Direction2.UpLeft:
-                    return Direction2.DownRight;
+                case Up:
+                    return Down;
+                case Right:
+                    return Left;
+                case Down:
+                    return Up;
+                case Left:
+                    return Right;
+                case UpRight:
+                    return DownLeft;
+                case DownRight:
+                    return UpLeft;
+                case DownLeft:
+                    return UpRight;
+                case UpLeft:
+                    return DownRight;
                 default:
-                    return Direction2.None;
+                    return None;
             }
         }
 
@@ -190,26 +194,7 @@ namespace MLEM.Misc {
         /// <param name="fortyFiveDegrees">Whether to rotate by 45 degrees. If this is false, the rotation is 90 degrees instead.</param>
         /// <returns>The rotated direction</returns>
         public static Direction2 RotateCw(this Direction2 dir, bool fortyFiveDegrees = false) {
-            switch (dir) {
-                case Direction2.Up:
-                    return fortyFiveDegrees ? Direction2.UpRight : Direction2.Right;
-                case Direction2.Right:
-                    return fortyFiveDegrees ? Direction2.DownRight : Direction2.Down;
-                case Direction2.Down:
-                    return fortyFiveDegrees ? Direction2.DownLeft : Direction2.Left;
-                case Direction2.Left:
-                    return fortyFiveDegrees ? Direction2.UpLeft : Direction2.Up;
-                case Direction2.UpRight:
-                    return fortyFiveDegrees ? Direction2.Right : Direction2.DownRight;
-                case Direction2.DownRight:
-                    return fortyFiveDegrees ? Direction2.Down : Direction2.DownLeft;
-                case Direction2.DownLeft:
-                    return fortyFiveDegrees ? Direction2.Left : Direction2.UpLeft;
-                case Direction2.UpLeft:
-                    return fortyFiveDegrees ? Direction2.Up : Direction2.UpRight;
-                default:
-                    return Direction2.None;
-            }
+            return Clockwise[(ClockwiseLookup[dir] + (fortyFiveDegrees ? 1 : 2)) % Clockwise.Length];
         }
 
         /// <summary>
@@ -219,26 +204,8 @@ namespace MLEM.Misc {
         /// <param name="fortyFiveDegrees">Whether to rotate by 45 degrees. If this is false, the rotation is 90 degrees instead.</param>
         /// <returns>The rotated direction</returns>
         public static Direction2 RotateCcw(this Direction2 dir, bool fortyFiveDegrees = false) {
-            switch (dir) {
-                case Direction2.Up:
-                    return fortyFiveDegrees ? Direction2.UpLeft : Direction2.Left;
-                case Direction2.Right:
-                    return fortyFiveDegrees ? Direction2.UpRight : Direction2.Up;
-                case Direction2.Down:
-                    return fortyFiveDegrees ? Direction2.DownRight : Direction2.Right;
-                case Direction2.Left:
-                    return fortyFiveDegrees ? Direction2.DownLeft : Direction2.Down;
-                case Direction2.UpRight:
-                    return fortyFiveDegrees ? Direction2.Up : Direction2.UpLeft;
-                case Direction2.DownRight:
-                    return fortyFiveDegrees ? Direction2.Right : Direction2.UpRight;
-                case Direction2.DownLeft:
-                    return fortyFiveDegrees ? Direction2.Down : Direction2.DownRight;
-                case Direction2.UpLeft:
-                    return fortyFiveDegrees ? Direction2.Left : Direction2.DownLeft;
-                default:
-                    return Direction2.None;
-            }
+            var index = ClockwiseLookup[dir] - (fortyFiveDegrees ? 1 : 2);
+            return Clockwise[index < 0 ? index + Clockwise.Length : index];
         }
 
         /// <summary>
@@ -252,7 +219,7 @@ namespace MLEM.Misc {
                 if (Math.Abs(dir.Angle() - offsetAngle) <= MathHelper.PiOver4 / 2)
                     return dir;
             }
-            return Direction2.None;
+            return None;
         }
 
         /// <summary>
@@ -263,10 +230,24 @@ namespace MLEM.Misc {
         /// <returns>The vector's direction</returns>
         public static Direction2 To90Direction(this Vector2 offset) {
             if (offset.X == 0 && offset.Y == 0)
-                return Direction2.None;
+                return None;
             if (Math.Abs(offset.X) > Math.Abs(offset.Y))
-                return offset.X > 0 ? Direction2.Right : Direction2.Left;
-            return offset.Y > 0 ? Direction2.Down : Direction2.Up;
+                return offset.X > 0 ? Right : Left;
+            return offset.Y > 0 ? Down : Up;
+        }
+
+        /// <summary>
+        /// Rotates the given direction by a given reference direction
+        /// </summary>
+        /// <param name="dir">The direction to rotate</param>
+        /// <param name="reference">The direction to rotate by</param>
+        /// <param name="start">The direction to use as the default direction</param>
+        /// <returns>The direction, rotated by the reference direction</returns>
+        public static Direction2 RotateBy(this Direction2 dir, Direction2 reference, Direction2 start = Up) {
+            var diff = ClockwiseLookup[reference] - ClockwiseLookup[start];
+            if (diff < 0)
+                diff += Clockwise.Length;
+            return Clockwise[(ClockwiseLookup[dir] + diff) % Clockwise.Length];
         }
 
     }

MLEM/Misc/SoundEffectInfo.cs

@@ -1,59 +1,13 @@
+using System;
 using Microsoft.Xna.Framework.Audio;
-using MLEM.Extensions;
 
 namespace MLEM.Misc {
-    /// <summary>
-    /// A sound effect info is a wrapper around <see cref="SoundEffect"/> that additionally stores <see cref="Volume"/>, <see cref="Pitch"/> and <see cref="Pan"/> information.
-    /// Additionally, a <see cref="SoundEffectInstance"/> can be created using <see cref="CreateInstance"/>.
-    /// </summary>
-    public class SoundEffectInfo {
+    /// <inheritdoc />
+    [Obsolete("This class has been moved to MLEM.Sound.SoundEffectInfo in 5.1.0")]
+    public class SoundEffectInfo : Sound.SoundEffectInfo {
 
-        /// <summary>
-        /// The <see cref="SoundEffect"/> that is played by this info.
-        /// </summary>
-        public readonly SoundEffect Sound;
-        /// <summary>
-        /// Volume, ranging from 0.0 (silence) to 1.0 (full volume). Volume during playback is scaled by SoundEffect.MasterVolume.
-        /// </summary>
-        public float Volume;
-        /// <summary>
-        /// Pitch adjustment, ranging from -1.0 (down an octave) to 0.0 (no change) to 1.0 (up an octave).
-        /// </summary>
-        public float Pitch;
-        /// <summary>
-        /// Pan value ranging from -1.0 (left speaker) to 0.0 (centered), 1.0 (right speaker).
-        /// </summary>
-        public float Pan;
-
-        /// <summary>
-        /// Creates a new sound effect info with the given values.
-        /// </summary>
-        /// <param name="sound">The sound to play</param>
-        /// <param name="volume">The volume to play the sound with</param>
-        /// <param name="pitch">The pitch to play the sound with</param>
-        /// <param name="pan">The pan to play the sound with</param>
-        public SoundEffectInfo(SoundEffect sound, float volume = 1, float pitch = 0, float pan = 0) {
-            this.Sound = sound;
-            this.Volume = volume;
-            this.Pitch = pitch;
-            this.Pan = pan;
-        }
-
-        /// <summary>
-        /// Plays this info's <see cref="Sound"/> once.
-        /// </summary>
-        /// <returns>False if more sounds are currently playing than the platform allows</returns>
-        public bool Play() {
-            return this.Sound.Play(this.Volume, this.Pitch, this.Pan);
-        }
-
-        /// <summary>
-        /// Creates a new <see cref="SoundEffectInstance"/> with this sound effect info's data.
-        /// </summary>
-        /// <param name="isLooped">The value to set the returned instance's <see cref="SoundEffectInstance.IsLooped"/> to. Defaults to false.</param>
-        /// <returns>A new sound effect instance, with this info's data applied</returns>
-        public SoundEffectInstance CreateInstance(bool isLooped = false) {
-            return this.Sound.CreateInstance(this.Volume, this.Pitch, this.Pan, isLooped);
+        /// <inheritdoc />
+        public SoundEffectInfo(SoundEffect sound, float volume = 1, float pitch = 0, float pan = 0) : base(sound, volume, pitch, pan) {
         }
 
     }

MLEM/Misc/SoundEffectInstanceHandler.cs

@@ -1,142 +1,14 @@
 using System;
-using System.Collections;
-using System.Collections.Generic;
 using Microsoft.Xna.Framework;
-using Microsoft.Xna.Framework.Audio;
 
 namespace MLEM.Misc {
-    /// <summary>
-    /// A simple class that handles automatically removing and disposing <see cref="SoundEffectInstance"/> objects once they are done playing to free up the audio source for new sounds.
-    /// Additionally, a callback can be registered that is invoked when the <see cref="SoundEffectInstance"/> finishes playing.
-    /// Note that an object of this class can be added to a <see cref="Game"/> using its <see cref="GameComponentCollection"/>.
-    /// </summary>
-    public class SoundEffectInstanceHandler : GameComponent, IEnumerable<SoundEffectInstance> {
+    /// <inheritdoc />
+    [Obsolete("This class has been moved to MLEM.Sound.SoundEffectInstanceHandler in 5.1.0")]
+    public class SoundEffectInstanceHandler : Sound.SoundEffectInstanceHandler {
 
-        private readonly List<Entry> playingSounds = new List<Entry>();
-        private AudioListener[] listeners;
-
-        /// <summary>
-        /// Creates a new sound effect instance handler with the given settings
-        /// </summary>
-        /// <param name="game">The game instance</param>
+        /// <inheritdoc />
         public SoundEffectInstanceHandler(Game game) : base(game) {
         }
 
-        /// <inheritdoc cref="Update()"/>
-        public override void Update(GameTime gameTime) {
-            this.Update();
-        }
-
-        /// <summary>
-        /// Updates this sound effect handler and manages all of the <see cref="SoundEffectInstance"/> objects in it.
-        /// If <see cref="SetListeners"/> has been called, all sounds will additionally be updated in 3D space.
-        /// This should be called each update frame.
-        /// </summary>
-        public void Update() {
-            for (var i = this.playingSounds.Count - 1; i >= 0; i--) {
-                var entry = this.playingSounds[i];
-                if (entry.Instance.IsDisposed || entry.Instance.State == SoundState.Stopped) {
-                    entry.Instance.Stop(true);
-                    entry.OnStopped?.Invoke(entry.Instance);
-                    this.playingSounds.RemoveAt(i);
-                } else {
-                    entry.TryApply3D(this.listeners);
-                }
-            }
-        }
-
-        /// <summary>
-        /// Sets the collection <see cref="AudioListener"/> objects that should be listening to the sounds in this handler in 3D space.
-        /// If there are one or more listeners, this handler applies 3d effects to all sound effect instances that have been added to this handler along with an <see cref="AudioEmitter"/> in <see cref="Update(Microsoft.Xna.Framework.GameTime)"/> automatically.
-        /// </summary>
-        public void SetListeners(params AudioListener[] listeners) {
-            this.listeners = listeners;
-        }
-
-        /// <summary>
-        /// Pauses all of the sound effect instances that are currently playing
-        /// </summary>
-        public void Pause() {
-            foreach (var entry in this.playingSounds)
-                entry.Instance.Pause();
-        }
-
-        /// <summary>
-        /// Resumes all of the sound effect instances in this handler
-        /// </summary>
-        public void Resume() {
-            foreach (var entry in this.playingSounds)
-                entry.Instance.Resume();
-        }
-
-        /// <summary>
-        /// Adds a new <see cref="SoundEffectInstance"/> to this handler.
-        /// This also starts playing the instance.
-        /// </summary>
-        /// <param name="instance">The instance to add</param>
-        /// <param name="onStopped">The function that should be invoked when this instance stops playing, defaults to null</param>
-        /// <param name="emitter">An optional audio emitter with which 3d sound can be applied</param>
-        /// <returns>The passed instance, for chaining</returns>
-        public SoundEffectInstance Add(SoundEffectInstance instance, Action<SoundEffectInstance> onStopped = null, AudioEmitter emitter = null) {
-            var entry = new Entry(instance, onStopped, emitter);
-            this.playingSounds.Add(entry);
-            instance.Play();
-            entry.TryApply3D(this.listeners);
-            return instance;
-        }
-
-        /// <summary>
-        /// Adds a new <see cref="SoundEffectInfo"/> to this handler.
-        /// This also starts playing the created instance.
-        /// </summary>
-        /// <param name="info">The info for which to add a <see cref="SoundEffectInstance"/></param>
-        /// <param name="onStopped">The function that should be invoked when this instance stops playing, defaults to null</param>
-        /// <param name="emitter">An optional audio emitter with which 3d sound can be applied</param>
-        /// <returns>The newly created <see cref="SoundEffectInstance"/></returns>
-        public SoundEffectInstance Add(SoundEffectInfo info, Action<SoundEffectInstance> onStopped = null, AudioEmitter emitter = null) {
-            return this.Add(info.CreateInstance(), onStopped, emitter);
-        }
-
-        /// <summary>
-        /// Adds a new <see cref="SoundEffect"/> to this handler.
-        /// This also starts playing the created instance.
-        /// </summary>
-        /// <param name="effect">The sound for which to add a <see cref="SoundEffectInstance"/></param>
-        /// <param name="onStopped">The function that should be invoked when this instance stops playing, defaults to null</param>
-        /// <param name="emitter">An optional audio emitter with which 3d sound can be applied</param>
-        /// <returns>The newly created <see cref="SoundEffectInstance"/></returns>
-        public SoundEffectInstance Add(SoundEffect effect, Action<SoundEffectInstance> onStopped = null, AudioEmitter emitter = null) {
-            return this.Add(effect.CreateInstance(), onStopped, emitter);
-        }
-
-        /// <inheritdoc />
-        public IEnumerator<SoundEffectInstance> GetEnumerator() {
-            foreach (var sound in this.playingSounds)
-                yield return sound.Instance;
-        }
-
-        IEnumerator IEnumerable.GetEnumerator() {
-            return this.GetEnumerator();
-        }
-
-        private readonly struct Entry {
-
-            public readonly SoundEffectInstance Instance;
-            public readonly Action<SoundEffectInstance> OnStopped;
-            public readonly AudioEmitter Emitter;
-
-            public Entry(SoundEffectInstance instance, Action<SoundEffectInstance> onStopped, AudioEmitter emitter) {
-                this.Instance = instance;
-                this.OnStopped = onStopped;
-                this.Emitter = emitter;
-            }
-
-            public void TryApply3D(AudioListener[] listeners) {
-                if (listeners != null && listeners.Length > 0 && this.Emitter != null)
-                    this.Instance.Apply3D(listeners, this.Emitter);
-            }
-
-        }
-
     }
 }

MLEM/Sound/SoundEffectInfo.cs

@@ -0,0 +1,60 @@
+using Microsoft.Xna.Framework.Audio;
+using MLEM.Extensions;
+
+namespace MLEM.Sound {
+    /// <summary>
+    /// A sound effect info is a wrapper around <see cref="SoundEffect"/> that additionally stores <see cref="Volume"/>, <see cref="Pitch"/> and <see cref="Pan"/> information.
+    /// Additionally, a <see cref="SoundEffectInstance"/> can be created using <see cref="CreateInstance"/>.
+    /// </summary>
+    public class SoundEffectInfo {
+
+        /// <summary>
+        /// The <see cref="SoundEffect"/> that is played by this info.
+        /// </summary>
+        public readonly SoundEffect Sound;
+        /// <summary>
+        /// Volume, ranging from 0.0 (silence) to 1.0 (full volume). Volume during playback is scaled by SoundEffect.MasterVolume.
+        /// </summary>
+        public float Volume;
+        /// <summary>
+        /// Pitch adjustment, ranging from -1.0 (down an octave) to 0.0 (no change) to 1.0 (up an octave).
+        /// </summary>
+        public float Pitch;
+        /// <summary>
+        /// Pan value ranging from -1.0 (left speaker) to 0.0 (centered), 1.0 (right speaker).
+        /// </summary>
+        public float Pan;
+
+        /// <summary>
+        /// Creates a new sound effect info with the given values.
+        /// </summary>
+        /// <param name="sound">The sound to play</param>
+        /// <param name="volume">The volume to play the sound with</param>
+        /// <param name="pitch">The pitch to play the sound with</param>
+        /// <param name="pan">The pan to play the sound with</param>
+        public SoundEffectInfo(SoundEffect sound, float volume = 1, float pitch = 0, float pan = 0) {
+            this.Sound = sound;
+            this.Volume = volume;
+            this.Pitch = pitch;
+            this.Pan = pan;
+        }
+
+        /// <summary>
+        /// Plays this info's <see cref="Sound"/> once.
+        /// </summary>
+        /// <returns>False if more sounds are currently playing than the platform allows</returns>
+        public bool Play() {
+            return this.Sound.Play(this.Volume, this.Pitch, this.Pan);
+        }
+
+        /// <summary>
+        /// Creates a new <see cref="SoundEffectInstance"/> with this sound effect info's data.
+        /// </summary>
+        /// <param name="isLooped">The value to set the returned instance's <see cref="SoundEffectInstance.IsLooped"/> to. Defaults to false.</param>
+        /// <returns>A new sound effect instance, with this info's data applied</returns>
+        public SoundEffectInstance CreateInstance(bool isLooped = false) {
+            return this.Sound.CreateInstance(this.Volume, this.Pitch, this.Pan, isLooped);
+        }
+
+    }
+}

MLEM/Sound/SoundEffectInstanceHandler.cs

@@ -0,0 +1,142 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Audio;
+
+namespace MLEM.Sound {
+    /// <summary>
+    /// A simple class that handles automatically removing and disposing <see cref="SoundEffectInstance"/> objects once they are done playing to free up the audio source for new sounds.
+    /// Additionally, a callback can be registered that is invoked when the <see cref="SoundEffectInstance"/> finishes playing.
+    /// Note that an object of this class can be added to a <see cref="Game"/> using its <see cref="GameComponentCollection"/>.
+    /// </summary>
+    public class SoundEffectInstanceHandler : GameComponent, IEnumerable<SoundEffectInstance> {
+
+        private readonly List<Entry> playingSounds = new List<Entry>();
+        private AudioListener[] listeners;
+
+        /// <summary>
+        /// Creates a new sound effect instance handler with the given settings
+        /// </summary>
+        /// <param name="game">The game instance</param>
+        public SoundEffectInstanceHandler(Game game) : base(game) {
+        }
+
+        /// <inheritdoc cref="Update()"/>
+        public override void Update(GameTime gameTime) {
+            this.Update();
+        }
+
+        /// <summary>
+        /// Updates this sound effect handler and manages all of the <see cref="SoundEffectInstance"/> objects in it.
+        /// If <see cref="SetListeners"/> has been called, all sounds will additionally be updated in 3D space.
+        /// This should be called each update frame.
+        /// </summary>
+        public void Update() {
+            for (var i = this.playingSounds.Count - 1; i >= 0; i--) {
+                var entry = this.playingSounds[i];
+                if (entry.Instance.IsDisposed || entry.Instance.State == SoundState.Stopped) {
+                    entry.Instance.Stop(true);
+                    entry.OnStopped?.Invoke(entry.Instance);
+                    this.playingSounds.RemoveAt(i);
+                } else {
+                    entry.TryApply3D(this.listeners);
+                }
+            }
+        }
+
+        /// <summary>
+        /// Sets the collection <see cref="AudioListener"/> objects that should be listening to the sounds in this handler in 3D space.
+        /// If there are one or more listeners, this handler applies 3d effects to all sound effect instances that have been added to this handler along with an <see cref="AudioEmitter"/> in <see cref="Update(Microsoft.Xna.Framework.GameTime)"/> automatically.
+        /// </summary>
+        public void SetListeners(params AudioListener[] listeners) {
+            this.listeners = listeners;
+        }
+
+        /// <summary>
+        /// Pauses all of the sound effect instances that are currently playing
+        /// </summary>
+        public void Pause() {
+            foreach (var entry in this.playingSounds)
+                entry.Instance.Pause();
+        }
+
+        /// <summary>
+        /// Resumes all of the sound effect instances in this handler
+        /// </summary>
+        public void Resume() {
+            foreach (var entry in this.playingSounds)
+                entry.Instance.Resume();
+        }
+
+        /// <summary>
+        /// Adds a new <see cref="SoundEffectInstance"/> to this handler.
+        /// This also starts playing the instance.
+        /// </summary>
+        /// <param name="instance">The instance to add</param>
+        /// <param name="onStopped">The function that should be invoked when this instance stops playing, defaults to null</param>
+        /// <param name="emitter">An optional audio emitter with which 3d sound can be applied</param>
+        /// <returns>The passed instance, for chaining</returns>
+        public SoundEffectInstance Add(SoundEffectInstance instance, Action<SoundEffectInstance> onStopped = null, AudioEmitter emitter = null) {
+            var entry = new Entry(instance, onStopped, emitter);
+            this.playingSounds.Add(entry);
+            instance.Play();
+            entry.TryApply3D(this.listeners);
+            return instance;
+        }
+
+        /// <summary>
+        /// Adds a new <see cref="Misc.SoundEffectInfo"/> to this handler.
+        /// This also starts playing the created instance.
+        /// </summary>
+        /// <param name="info">The info for which to add a <see cref="SoundEffectInstance"/></param>
+        /// <param name="onStopped">The function that should be invoked when this instance stops playing, defaults to null</param>
+        /// <param name="emitter">An optional audio emitter with which 3d sound can be applied</param>
+        /// <returns>The newly created <see cref="SoundEffectInstance"/></returns>
+        public SoundEffectInstance Add(SoundEffectInfo info, Action<SoundEffectInstance> onStopped = null, AudioEmitter emitter = null) {
+            return this.Add(info.CreateInstance(), onStopped, emitter);
+        }
+
+        /// <summary>
+        /// Adds a new <see cref="SoundEffect"/> to this handler.
+        /// This also starts playing the created instance.
+        /// </summary>
+        /// <param name="effect">The sound for which to add a <see cref="SoundEffectInstance"/></param>
+        /// <param name="onStopped">The function that should be invoked when this instance stops playing, defaults to null</param>
+        /// <param name="emitter">An optional audio emitter with which 3d sound can be applied</param>
+        /// <returns>The newly created <see cref="SoundEffectInstance"/></returns>
+        public SoundEffectInstance Add(SoundEffect effect, Action<SoundEffectInstance> onStopped = null, AudioEmitter emitter = null) {
+            return this.Add(effect.CreateInstance(), onStopped, emitter);
+        }
+
+        /// <inheritdoc />
+        public IEnumerator<SoundEffectInstance> GetEnumerator() {
+            foreach (var sound in this.playingSounds)
+                yield return sound.Instance;
+        }
+
+        IEnumerator IEnumerable.GetEnumerator() {
+            return this.GetEnumerator();
+        }
+
+        private readonly struct Entry {
+
+            public readonly SoundEffectInstance Instance;
+            public readonly Action<SoundEffectInstance> OnStopped;
+            public readonly AudioEmitter Emitter;
+
+            public Entry(SoundEffectInstance instance, Action<SoundEffectInstance> onStopped, AudioEmitter emitter) {
+                this.Instance = instance;
+                this.OnStopped = onStopped;
+                this.Emitter = emitter;
+            }
+
+            public void TryApply3D(AudioListener[] listeners) {
+                if (listeners != null && listeners.Length > 0 && this.Emitter != null)
+                    this.Instance.Apply3D(listeners, this.Emitter);
+            }
+
+        }
+
+    }
+}

Tests/DirectionTests.cs

@@ -1,22 +1,64 @@
 using Microsoft.Xna.Framework;
 using MLEM.Misc;
 using NUnit.Framework;
+using static MLEM.Misc.Direction2;
 
 namespace Tests {
     public class DirectionTests {
 
         [Test]
         public void TestDirections() {
-            Assert.AreEqual(new Vector2(0.5F, 0.5F).ToDirection(), Direction2.DownRight);
-            Assert.AreEqual(new Vector2(0.25F, 0.5F).ToDirection(), Direction2.DownRight);
-            Assert.AreEqual(new Vector2(0.15F, 0.5F).ToDirection(), Direction2.Down);
+            Assert.AreEqual(new Vector2(0.5F, 0.5F).ToDirection(), DownRight);
+            Assert.AreEqual(new Vector2(0.25F, 0.5F).ToDirection(), DownRight);
+            Assert.AreEqual(new Vector2(0.15F, 0.5F).ToDirection(), Down);
         }
 
         [Test]
         public void Test90Directions() {
-            Assert.AreEqual(new Vector2(0.75F, 0.5F).To90Direction(), Direction2.Right);
-            Assert.AreEqual(new Vector2(0.5F, 0.5F).To90Direction(), Direction2.Down);
-            Assert.AreEqual(new Vector2(0.25F, 0.5F).To90Direction(), Direction2.Down);
+            Assert.AreEqual(new Vector2(0.75F, 0.5F).To90Direction(), Right);
+            Assert.AreEqual(new Vector2(0.5F, 0.5F).To90Direction(), Down);
+            Assert.AreEqual(new Vector2(0.25F, 0.5F).To90Direction(), Down);
+        }
+
+        [Test]
+        public void TestRotations() {
+            // rotate cw
+            Assert.AreEqual(Up.RotateCw(), Right);
+            Assert.AreEqual(Up.RotateCw(true), UpRight);
+            Assert.AreEqual(Left.RotateCw(), Up);
+            Assert.AreEqual(UpLeft.RotateCw(), UpRight);
+
+            // rotate ccw
+            Assert.AreEqual(Up.RotateCcw(), Left);
+            Assert.AreEqual(Up.RotateCcw(true), UpLeft);
+            Assert.AreEqual(Left.RotateCcw(), Down);
+            Assert.AreEqual(UpLeft.RotateCcw(), DownLeft);
+
+            // rotate 360 degrees
+            foreach (var dir in Direction2Helper.AllExceptNone) {
+                Assert.AreEqual(RotateMultipleTimes(dir, true, false, 4), dir);
+                Assert.AreEqual(RotateMultipleTimes(dir, true, true, 8), dir);
+                Assert.AreEqual(RotateMultipleTimes(dir, false, false, 4), dir);
+                Assert.AreEqual(RotateMultipleTimes(dir, false, true, 8), dir);
+            }
+
+            // rotate by with start Up
+            Assert.AreEqual(Right.RotateBy(Right), Down);
+            Assert.AreEqual(Right.RotateBy(Down), Left);
+            Assert.AreEqual(Right.RotateBy(Left), Up);
+            Assert.AreEqual(Right.RotateBy(Up), Right);
+
+            // rotate by with start Left
+            Assert.AreEqual(Up.RotateBy(Right, Left), Down);
+            Assert.AreEqual(Up.RotateBy(Down, Left), Left);
+            Assert.AreEqual(Up.RotateBy(Left, Left), Up);
+            Assert.AreEqual(Up.RotateBy(Up, Left), Right);
+        }
+
+        private static Direction2 RotateMultipleTimes(Direction2 dir, bool clockwise, bool fortyFiveDegrees, int times) {
+            for (var i = 0; i < times; i++)
+                dir = clockwise ? dir.RotateCw(fortyFiveDegrees) : dir.RotateCcw(fortyFiveDegrees);
+            return dir;
         }
 
     }