Data-oriented Construction System (#2152)

- Powerful
- Data-oriented
- Approved by PJB
- Powered by node graphs and AI pathfinding
- Coded by the same nerd who brought you atmos

Co-authored-by: Exp <theexp111@gmail.com>

Content.Server/Utility/SnapgridHelper.cs

@@ -0,0 +1,43 @@
+using System;
+using Robust.Shared.GameObjects;
+using Robust.Shared.GameObjects.Components.Transform;
+using Robust.Shared.Interfaces.GameObjects;
+using Robust.Shared.Interfaces.Map;
+using Robust.Shared.IoC;
+using Robust.Shared.Map;
+using Robust.Shared.Maths;
+
+namespace Content.Server.Utility
+{
+    public static class SnapgridHelper
+    {
+        public static void SnapToGrid(this IEntity entity, SnapGridOffset offset = SnapGridOffset.Center, IEntityManager entityManager = null, IMapManager mapManager = null)
+        {
+            entity.Transform.Coordinates = entity.Transform.Coordinates.SnapToGrid(offset, entityManager, mapManager);
+        }
+
+        public static EntityCoordinates SnapToGrid(this EntityCoordinates coordinates,
+            SnapGridOffset offset = SnapGridOffset.Center, IEntityManager entityManager = null, IMapManager mapManager = null)
+        {
+            entityManager ??= IoCManager.Resolve<IEntityManager>();
+            mapManager ??= IoCManager.Resolve<IMapManager>();
+
+            var gridId = coordinates.GetGridId(entityManager);
+
+            var tileSize = 1f;
+
+            if (gridId.IsValid())
+            {
+                var grid = mapManager.GetGrid(gridId);
+                tileSize = grid.TileSize;
+            }
+
+            var localPos = coordinates.Position;
+
+            var x = (int)Math.Floor(localPos.X / tileSize) + tileSize / (offset == SnapGridOffset.Center ? 2f : 0f);
+            var y = (int)Math.Floor(localPos.Y / tileSize) + tileSize / (offset == SnapGridOffset.Center ? 2f : 0f);
+
+            return new EntityCoordinates(coordinates.EntityId, x, y);
+        }
+    }
+}