tbd-station-14/Content.Server/Construction/Completions/SnapToGrid.cs

using Content.Shared.Coordinates.Helpers;
using Content.Shared.Construction;
using JetBrains.Annotations;

namespace Content.Server.Construction.Completions
{
    [UsedImplicitly]
    [DataDefinition]
    public sealed partial class SnapToGrid : IGraphAction
    {
        [DataField("southRotation")] public bool SouthRotation { get; private set; }

        public void PerformAction(EntityUid uid, EntityUid? userUid, IEntityManager entityManager)
        {
            var transform = entityManager.GetComponent<TransformComponent>(uid);

            var xformSystem = entityManager.System<SharedTransformSystem>();
            if (!transform.Anchored)
                xformSystem.SetCoordinates((uid, transform, entityManager.GetComponent<MetaDataComponent>(uid)), transform.Coordinates.SnapToGrid(entityManager));

            if (SouthRotation)
                xformSystem.SetLocalRotation(uid, Angle.Zero, transform);
        }
    }
}