(2a7829fab) Add ISpatialEntity as a common interface for everything that has a position in the game world. Would have used IMapEntity, but there's already MapEntity, which inherits Entity, so that would be confusing. Declare the inheritance only in the shared class (Character).

Barotrauma/BarotraumaShared/Source/Characters/Character.cs

@@ -14,7 +14,7 @@ using System.Text;
 
 namespace Barotrauma
 {
-    partial class Character : Entity, IDamageable, ISerializableEntity, IClientSerializable, IServerSerializable
+    partial class Character : Entity, IDamageable, ISerializableEntity, IClientSerializable, IServerSerializable, ISpatialEntity
     {
         public static List<Character> CharacterList = new List<Character>();
 

Barotrauma/BarotraumaShared/Source/Characters/Limb.cs

@@ -94,7 +94,7 @@ namespace Barotrauma
         }
     }
     
-    partial class Limb : ISerializableEntity
+    partial class Limb : ISerializableEntity, ISpatialEntity
     {
         // Note: not used
         private const float LimbDensity = 15;
@@ -155,6 +155,8 @@ namespace Barotrauma
             }
         }
 
+        public Submarine Submarine => character.Submarine;
+
         public Vector2 WorldPosition
         {
             get { return character.Submarine == null ? Position : Position + character.Submarine.Position; }

Barotrauma/BarotraumaShared/Source/Items/Components/Machines/Steering.cs

@@ -263,6 +263,19 @@ namespace Barotrauma.Items.Components
             return true;
         }
 
+        public override void OnItemLoaded()
+        {
+            sonar = item.GetComponent<Sonar>();
+        }
+
+        public override bool Select(Character character)
+        {
+            if (!CanBeSelected) return false;
+
+            user = character;
+            return true;
+        }
+
         public override void Update(float deltaTime, Camera cam)
         {
             networkUpdateTimer -= deltaTime;

Barotrauma/BarotraumaShared/Source/Map/Entity.cs

@@ -6,7 +6,7 @@ using System.Text;
 
 namespace Barotrauma
 {
-    class Entity
+    class Entity : ISpatialEntity
     {
         public const ushort NullEntityID = 0;
 

Barotrauma/BarotraumaShared/Source/Map/ISpatialEntity.cs

@@ -0,0 +1,12 @@
+using Microsoft.Xna.Framework;
+
+namespace Barotrauma
+{
+    interface ISpatialEntity
+    {
+        Vector2 Position { get; }
+        Vector2 WorldPosition { get; }
+        Vector2 SimPosition { get; }
+        Submarine Submarine { get; }
+    }
+}