Fix station announcements (#9380)

* Fix station announcements

Doesn't just get what's on the grid. Also made it generic so other systems can use a station filter.

* bumped

* a

Content.Server/Station/Systems/StationSystem.cs

@@ -6,8 +6,11 @@ using Content.Server.GameTicking;
 using Content.Server.Station.Components;
 using Content.Shared.CCVar;
 using JetBrains.Annotations;
+using Robust.Server.Player;
+using Robust.Shared.Collections;
 using Robust.Shared.Configuration;
 using Robust.Shared.Map;
+using Robust.Shared.Player;
 using Robust.Shared.Random;
 
 namespace Content.Server.Station.Systems;
@@ -24,9 +27,11 @@ public sealed class StationSystem : EntitySystem
     [Dependency] private readonly IConfigurationManager _configurationManager = default!;
     [Dependency] private readonly ILogManager _logManager = default!;
     [Dependency] private readonly IMapManager _mapManager = default!;
+    [Dependency] private readonly IPlayerManager _player = default!;
     [Dependency] private readonly IRobustRandom _random = default!;
     [Dependency] private readonly ChatSystem _chatSystem = default!;
     [Dependency] private readonly GameTicker _gameTicker = default!;
+    [Dependency] private readonly SharedTransformSystem _transform = default!;
 
     private ISawmill _sawmill = default!;
 
@@ -153,12 +158,59 @@ public sealed class StationSystem : EntitySystem
 
     #endregion Event handlers
 
+    /// <summary>
+    /// Retrieves a filter for everything in a particular station or near its member grids.
+    /// </summary>
+    public Filter GetInStation(StationDataComponent dataComponent, float range = 32f)
+    {
+        // Could also use circles if you wanted.
+        var bounds = new ValueList<Box2>(dataComponent.Grids.Count);
+        var filter = Filter.Empty();
+        var mapIds = new ValueList<MapId>();
+        var xformQuery = GetEntityQuery<TransformComponent>();
+
+        foreach (var gridUid in dataComponent.Grids)
+        {
+            if (!_mapManager.TryGetGrid(gridUid, out var grid) ||
+                !xformQuery.TryGetComponent(gridUid, out var xform)) continue;
+
+            var mapId = xform.MapID;
+            var position = _transform.GetWorldPosition(xform, xformQuery);
+            var bound = grid.LocalAABB.Enlarged(range).Translated(position);
+
+            bounds.Add(bound);
+            if (!mapIds.Contains(mapId))
+            {
+                mapIds.Add(grid.ParentMapId);
+            }
+        }
+
+        foreach (var session in Filter.GetAllPlayers(_player))
+        {
+            var entity = session.AttachedEntity;
+            if (entity == null || !xformQuery.TryGetComponent(entity, out var xform)) continue;
+
+            var mapId = xform.MapID;
+
+            if (!mapIds.Contains(mapId)) continue;
+
+            var position = _transform.GetWorldPosition(xform, xformQuery);
+
+            foreach (var bound in bounds)
+            {
+                if (!bound.Contains(position)) continue;
+
+                filter.AddPlayer(session);
+                break;
+            }
+        }
+
+        return filter;
+    }
 
     /// <summary>
     /// Generates a station name from the given config.
     /// </summary>
-    /// <param name="config"></param>
-    /// <returns></returns>
     public static string GenerateStationName(StationConfig config)
     {
         return config.NameGenerator is not null