Prevents the MoverSystem from overwriting the MoverComponent on an entity.

Adds the new ShuttleControllerComponent, a custom IMoverComponent that moves the parent grid when controlled by a mind.

Content.Server/GameObjects/Components/Movement/AiControllerComponent.cs

@@ -84,5 +84,7 @@ namespace Content.Server.GameObjects.Components.Movement
 
         [ViewVariables(VVAccess.ReadWrite)]
         public float StepSoundDistance { get; set; }
+
+        public void SetVelocityDirection(Direction direction, bool enabled) { }
     }
 }

Content.Server/GameObjects/Components/Movement/ShuttleControllerComponent.cs

@@ -0,0 +1,130 @@
+using Content.Server.GameObjects.Components.Mobs;
+using Content.Server.Interfaces.GameObjects.Components.Movement;
+using Robust.Server.GameObjects;
+using Robust.Server.GameObjects.Components.Container;
+using Robust.Server.Interfaces.GameObjects;
+using Robust.Server.Interfaces.Player;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Interfaces.GameObjects;
+using Robust.Shared.Interfaces.Map;
+using Robust.Shared.Interfaces.Network;
+using Robust.Shared.Interfaces.Timing;
+using Robust.Shared.IoC;
+using Robust.Shared.Log;
+using Robust.Shared.Map;
+using Robust.Shared.Maths;
+using Robust.Shared.ViewVariables;
+
+namespace Content.Server.GameObjects.Components.Movement
+{
+    [RegisterComponent]
+    [ComponentReference(typeof(IMoverComponent))]
+    class ShuttleControllerComponent : Component, IMoverComponent
+    {
+        [Dependency] IMapManager mapManager;
+        [Dependency] IEntityManager entityManager;
+        [Dependency] IGameTiming gameTiming;
+
+        private bool _movingUp;
+        private bool _movingDown;
+        private bool _movingLeft;
+        private bool _movingRight;
+
+        public override string Name => "ShuttleController";
+
+        [ViewVariables(VVAccess.ReadWrite)]
+        public float WalkMoveSpeed { get; set; } = 8;
+        public float SprintMoveSpeed { get; set; }
+        public bool Sprinting { get; set; }
+        public Vector2 VelocityDir { get; }
+        public GridCoordinates LastPosition { get; set; }
+        public float StepSoundDistance { get; set; }
+
+        public void SetVelocityDirection(Direction direction, bool enabled)
+        {
+            var gridId = Owner.Transform.GridID;
+
+            if (mapManager.TryGetGrid(gridId, out var grid) && entityManager.TryGetEntity(grid.GridEntityId, out var gridEntity))
+            {
+                //TODO: Switch to shuttle component
+                if (!gridEntity.TryGetComponent(out PhysicsComponent physComp))
+                {
+                    physComp = gridEntity.AddComponent<PhysicsComponent>();
+                    physComp.Mass = 1;
+                }
+
+                physComp.LinearVelocity = CalcNewVelocity(direction, enabled) * WalkMoveSpeed;
+            }
+        }
+
+        private Vector2 CalcNewVelocity(Direction direction, bool enabled)
+        {
+            switch (direction)
+            {
+                case Direction.East:
+                    _movingRight = enabled;
+                    break;
+                case Direction.North:
+                    _movingUp = enabled;
+                    break;
+                case Direction.West:
+                    _movingLeft = enabled;
+                    break;
+                case Direction.South:
+                    _movingDown = enabled;
+                    break;
+            }
+
+            // key directions are in screen coordinates
+            // _moveDir is in world coordinates
+            // if the camera is moved, this needs to be changed
+
+            var x = 0;
+            x -= _movingLeft ? 1 : 0;
+            x += _movingRight ? 1 : 0;
+
+            var y = 0;
+            y -= _movingDown ? 1 : 0;
+            y += _movingUp ? 1 : 0;
+
+            var result = new Vector2(x, y);
+
+            // can't normalize zero length vector
+            if (result.LengthSquared > 1.0e-6)
+                result = result.Normalized;
+
+            return result;
+        }
+
+        /// <inheritdoc />
+        public override void HandleMessage(ComponentMessage message, INetChannel netChannel = null, IComponent component = null)
+        {
+            base.HandleMessage(message, netChannel, component);
+
+            if(netChannel != null)
+                return;
+
+            switch (message)
+            {
+                case ContainerContentsModifiedMessage contents:
+                    if(contents.Entity.TryGetComponent(out MindComponent mindComp))
+                        ContentsChanged(contents.Entity, mindComp, contents.Removed);
+                    break;
+            }
+        }
+
+        private void ContentsChanged(IEntity entity, MindComponent mindComp, in bool removed)
+        {
+            Logger.DebugS("shuttle", $"Pilot={entity.Name}, removed={removed}");
+
+            if (!removed)
+            {
+                mindComp.Mind.Visit(Owner);
+            }
+            else
+            {
+                mindComp.Mind.UnVisit();
+            }
+        }
+    }
+}

Content.Server/GameObjects/EntitySystems/MoverSystem.cs

@@ -15,6 +15,7 @@ using Robust.Shared.GameObjects;
 using Robust.Shared.GameObjects.Components.Transform;
 using Robust.Shared.GameObjects.Systems;
 using Robust.Shared.Input;
+using Robust.Shared.Interfaces.GameObjects;
 using Robust.Shared.Interfaces.GameObjects.Components;
 using Robust.Shared.Interfaces.Map;
 using Robust.Shared.Interfaces.Random;
@@ -81,17 +82,19 @@ namespace Content.Server.GameObjects.EntitySystems
 
         private static void PlayerAttached(object sender, PlayerAttachSystemMessage ev)
         {
-            if (ev.Entity.HasComponent<IMoverComponent>())
+            if (!ev.Entity.HasComponent<IMoverComponent>())
             {
-                ev.Entity.RemoveComponent<IMoverComponent>();
-            }
                 ev.Entity.AddComponent<PlayerInputMoverComponent>();
             }
+        }
 
         private static void PlayerDetached(object sender, PlayerDetachedSystemMessage ev)
+        {
+            if(ev.Entity.HasComponent<PlayerInputMoverComponent>())
             {
                 ev.Entity.RemoveComponent<PlayerInputMoverComponent>();
             }
+        }
 
         /// <inheritdoc />
         public override void Shutdown()
@@ -174,7 +177,7 @@ namespace Content.Server.GameObjects.EntitySystems
 
         private static void HandleDirChange(ICommonSession session, Direction dir, bool state)
         {
-            if(!TryGetAttachedComponent(session as IPlayerSession, out PlayerInputMoverComponent moverComp))
+            if(!TryGetAttachedComponent(session as IPlayerSession, out IMoverComponent moverComp))
                 return;
 
             moverComp.SetVelocityDirection(dir, state);
@@ -189,7 +192,7 @@ namespace Content.Server.GameObjects.EntitySystems
         }
 
         private static bool TryGetAttachedComponent<T>(IPlayerSession session, out T component)
-            where T: Component
+            where T: IComponent
         {
             component = default;
 

Content.Server/Interfaces/GameObjects/Components/Movement/IMoverComponent.cs

@@ -1,4 +1,5 @@
-using Robust.Shared.Interfaces.GameObjects;
+using Content.Server.GameObjects.Components.Movement;
+using Robust.Shared.Interfaces.GameObjects;
 using Robust.Shared.Map;
 using Robust.Shared.Maths;
 
@@ -31,5 +32,14 @@ namespace Content.Server.Interfaces.GameObjects.Components.Movement
         GridCoordinates LastPosition { get; set; }
 
         float StepSoundDistance { get; set; }
+
+        /// <summary>
+        ///     Toggles one of the four cardinal directions. Each of the four directions are
+        ///     composed into a single direction vector, <see cref="PlayerInputMoverComponent.VelocityDir"/>. Enabling
+        ///     opposite directions will cancel each other out, resulting in no direction.
+        /// </summary>
+        /// <param name="direction">Direction to toggle.</param>
+        /// <param name="enabled">If the direction is active.</param>
+        void SetVelocityDirection(Direction direction, bool enabled);
     }
 }

Resources/Prototypes/Entities/buildings/shuttle.yml

@@ -23,3 +23,6 @@
   - type: Damageable
   - type: Destructible
     thresholdvalue: 100
+    
+  - type: Physics
+  - type: ShuttleController