Evac shuttle (#8931)

Co-authored-by: metalgearsloth <metalgearsloth@gmail.com>

Content.Client/Shuttles/Systems/ShuttleSystem.EmergencyConsole.cs

@@ -0,0 +1,80 @@
+using Content.Shared.Shuttles.Events;
+using Content.Shared.Shuttles.Systems;
+using Robust.Client.Graphics;
+using Robust.Shared.Enums;
+
+namespace Content.Client.Shuttles.Systems;
+
+public sealed partial class ShuttleSystem : SharedShuttleSystem
+{
+    /// <summary>
+    /// Should we show the expected emergency shuttle position.
+    /// </summary>
+    public bool EnableShuttlePosition
+    {
+        get => _enableShuttlePosition;
+        set
+        {
+            if (_enableShuttlePosition == value) return;
+
+            _enableShuttlePosition = value;
+            var overlayManager = IoCManager.Resolve<IOverlayManager>();
+
+            if (_enableShuttlePosition)
+            {
+                _overlay = new EmergencyShuttleOverlay(EntityManager);
+                overlayManager.AddOverlay(_overlay);
+                RaiseNetworkEvent(new EmergencyShuttleRequestPositionMessage());
+            }
+            else
+            {
+                overlayManager.RemoveOverlay(_overlay!);
+                _overlay = null;
+            }
+        }
+    }
+
+    private bool _enableShuttlePosition;
+    private EmergencyShuttleOverlay? _overlay;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+        SubscribeNetworkEvent<EmergencyShuttlePositionMessage>(OnShuttlePosMessage);
+    }
+
+    private void OnShuttlePosMessage(EmergencyShuttlePositionMessage ev)
+    {
+        if (_overlay == null) return;
+
+        _overlay.StationUid = ev.StationUid;
+        _overlay.Position = ev.Position;
+    }
+}
+
+/// <summary>
+/// Shows the expected position of the emergency shuttle. Nothing more.
+/// </summary>
+public sealed class EmergencyShuttleOverlay : Overlay
+{
+    private IEntityManager _entManager;
+
+    public override OverlaySpace Space => OverlaySpace.WorldSpace;
+
+    public EntityUid? StationUid;
+    public Box2? Position;
+
+    public EmergencyShuttleOverlay(IEntityManager entManager)
+    {
+        _entManager = entManager;
+    }
+
+    protected override void Draw(in OverlayDrawArgs args)
+    {
+        if (Position == null || !_entManager.TryGetComponent<TransformComponent>(StationUid, out var xform)) return;
+
+        args.WorldHandle.SetTransform(xform.WorldMatrix);
+        args.WorldHandle.DrawRect(Position.Value, Color.Red.WithAlpha(100));
+        args.WorldHandle.SetTransform(Matrix3.Identity);
+    }
+}