Replace MoveIntoWorld with ReturnToCell/AssociateWithAirfield.

OpenRA.Mods.Cnc/Traits/TDGunboat.cs

@@ -191,7 +191,7 @@ public Activity MoveWithinRange(Target target, WDist minRange, WDist maxRange,
 			WPos? initialTargetPosition = null, Color? targetLineColor = null) { return null; }
 		public Activity MoveFollow(Actor self, Target target, WDist minRange, WDist maxRange,
 			WPos? initialTargetPosition = null, Color? targetLineColor = null) { return null; }
-		public Activity MoveIntoWorld(Actor self, int delay = 0) { return null; }
+		public Activity ReturnToCell(Actor self) { return null; }
 		public Activity MoveToTarget(Actor self, Target target,
 			WPos? initialTargetPosition = null, Color? targetLineColor = null) { return null; }
 		public Activity MoveIntoTarget(Actor self, Target target) { return null; }

OpenRA.Mods.Common/Activities/Enter.cs

@@ -138,7 +138,7 @@ public override bool Tick(Actor self)
 
 				case EnterState.Exiting:
 				{
-					QueueChild(move.MoveIntoWorld(self));
+					QueueChild(move.ReturnToCell(self));
 					lastState = EnterState.Finished;
 					return false;
 				}

OpenRA.Mods.Common/ActorInitializer.cs

@@ -24,13 +24,13 @@ public FacingInit() { }
 		public int Value(World world) { return value; }
 	}
 
-	public class MoveIntoWorldDelayInit : IActorInit<int>
+	public class CreationActivityDelayInit : IActorInit<int>
 	{
 		[FieldFromYamlKey]
 		readonly int value = 0;
 
-		public MoveIntoWorldDelayInit() { }
-		public MoveIntoWorldDelayInit(int init) { value = init; }
+		public CreationActivityDelayInit() { }
+		public CreationActivityDelayInit(int init) { value = init; }
 		public int Value(World world) { return value; }
 	}
 

OpenRA.Mods.Common/Scripting/Properties/MobileProperties.cs

@@ -49,7 +49,7 @@ public void MoveIntoWorld(CPos cell)
 			var pos = Self.CenterPosition;
 			mobile.SetPosition(Self, cell);
 			mobile.SetVisualPosition(Self, pos);
-			Self.QueueActivity(mobile.MoveIntoWorld(Self));
+			Self.QueueActivity(mobile.ReturnToCell(Self));
 		}
 
 		[ScriptActorPropertyActivity]

OpenRA.Mods.Common/Scripting/Properties/TransportProperties.cs

@@ -10,6 +10,7 @@
 #endregion
 
 using System.Linq;
+using Eluant;
 using OpenRA.Mods.Common.Activities;
 using OpenRA.Mods.Common.Traits;
 using OpenRA.Scripting;
@@ -35,7 +36,13 @@ public TransportProperties(ScriptContext context, Actor self)
 		public int PassengerCount { get { return cargo.Passengers.Count(); } }
 
 		[Desc("Teleport an existing actor inside this transport.")]
-		public void LoadPassenger(Actor a) { cargo.Load(Self, a); }
+		public void LoadPassenger(Actor a)
+		{
+			if (!a.IsIdle)
+				throw new LuaException("LoadPassenger requires the passenger to be idle.");
+
+			cargo.Load(Self, a);
+		}
 
 		[Desc("Remove the first actor from the transport.  This actor is not added to the world.")]
 		public Actor UnloadPassenger() { return cargo.Unload(Self); }

OpenRA.Mods.Common/Traits/Air/Aircraft.cs

@@ -220,7 +220,7 @@ public class Aircraft : ITick, ISync, IFacing, IPositionable, IMove, IIssueOrder
 
 		IEnumerable<CPos> landingCells = Enumerable.Empty<CPos>();
 		bool requireForceMove;
-		int moveIntoWorldDelay;
+		int creationActivityDelay;
 
 		public static WPos GroundPosition(Actor self)
 		{
@@ -251,7 +251,9 @@ public Aircraft(ActorInitializer init, AircraftInfo info)
 				SetPosition(self, init.Get<CenterPositionInit, WPos>());
 
 			Facing = init.Contains<FacingInit>() ? init.Get<FacingInit, int>() : Info.InitialFacing;
-			moveIntoWorldDelay = init.Contains<MoveIntoWorldDelayInit>() ? init.Get<MoveIntoWorldDelayInit, int>() : 0;
+
+			if (init.Contains<CreationActivityDelayInit>())
+				creationActivityDelay = init.Get<CreationActivityDelayInit, int>();
 		}
 
 		public WDist LandAltitude
@@ -841,18 +843,15 @@ public Activity MoveFollow(Actor self, Target target, WDist minRange, WDist maxR
 				initialTargetPosition, targetLineColor);
 		}
 
-		public Activity MoveIntoWorld(Actor self, int delay = 0)
-		{
-			return new MoveIntoWorldActivity(self, delay);
-		}
+		public Activity ReturnToCell(Actor self) { return null; }
 
-		class MoveIntoWorldActivity : Activity
+		class AssociateWithAirfieldActivity : Activity
 		{
 			readonly Actor self;
 			readonly Aircraft aircraft;
 			readonly int delay;
 
-			public MoveIntoWorldActivity(Actor self, int delay = 0)
+			public AssociateWithAirfieldActivity(Actor self, int delay = 0)
 			{
 				this.self = self;
 				aircraft = self.Trait<Aircraft>();
@@ -1164,7 +1163,7 @@ void IActorPreviewInitModifier.ModifyActorPreviewInit(Actor self, TypeDictionary
 
 		Activity ICreationActivity.GetCreationActivity()
 		{
-			return MoveIntoWorld(self, moveIntoWorldDelay);
+			return new AssociateWithAirfieldActivity(self, creationActivityDelay);
 		}
 
 		public class AircraftMoveOrderTargeter : IOrderTargeter

OpenRA.Mods.Common/Traits/Cargo.cs

@@ -406,11 +406,11 @@ public void Load(Actor self, Actor a)
 			// If not initialized then this will be notified in the first tick
 			if (initialized)
 			{
-				foreach (var npe in self.TraitsImplementing<INotifyPassengerEntered>())
-					npe.OnPassengerEntered(self, a);
-
 				foreach (var nec in a.TraitsImplementing<INotifyEnteredCargo>())
 					nec.OnEnteredCargo(a, self);
+
+				foreach (var npe in self.TraitsImplementing<INotifyPassengerEntered>())
+					npe.OnPassengerEntered(self, a);
 			}
 
 			var p = a.Trait<Passenger>();
@@ -507,11 +507,11 @@ void ITick.Tick(Actor self)
 				{
 					c.Trait<Passenger>().Transport = self;
 
-					foreach (var npe in self.TraitsImplementing<INotifyPassengerEntered>())
-						npe.OnPassengerEntered(self, c);
-
 					foreach (var nec in c.TraitsImplementing<INotifyEnteredCargo>())
 						nec.OnEnteredCargo(c, self);
+
+					foreach (var npe in self.TraitsImplementing<INotifyPassengerEntered>())
+						npe.OnPassengerEntered(self, c);
 				}
 
 				initialized = true;

OpenRA.Mods.Common/Traits/Mobile.cs

@@ -143,7 +143,10 @@ public class Mobile : PausableConditionalTrait<MobileInfo>, IIssueOrder, IResolv
 	{
 		readonly Actor self;
 		readonly Lazy<IEnumerable<int>> speedModifiers;
-		readonly int moveIntoWorldDelay;
+
+		readonly bool returnToCellOnCreation;
+		readonly bool returnToCellOnCreationRecalculateSubCell = true;
+		readonly int creationActivityDelay;
 
 		#region IMove CurrentMovementTypes
 		MovementType movementTypes;
@@ -228,7 +231,10 @@ public Mobile(ActorInitializer init, MobileInfo info)
 
 			ToSubCell = FromSubCell = info.LocomotorInfo.SharesCell ? init.World.Map.Grid.DefaultSubCell : SubCell.FullCell;
 			if (init.Contains<SubCellInit>())
+			{
 				FromSubCell = ToSubCell = init.Get<SubCellInit, SubCell>();
+				returnToCellOnCreationRecalculateSubCell = false;
+			}
 
 			if (init.Contains<LocationInit>())
 			{
@@ -238,12 +244,16 @@ public Mobile(ActorInitializer init, MobileInfo info)
 
 			Facing = init.Contains<FacingInit>() ? init.Get<FacingInit, int>() : info.InitialFacing;
 
-			// Sets the visual position to WPos accuracy
-			// Use LocationInit if you want to insert the actor into the ActorMap!
+			// Sets the initial visual position
+			// Unit will move into the cell grid (defined by LocationInit) as its initial activity
 			if (init.Contains<CenterPositionInit>())
+			{
 				SetVisualPosition(self, init.Get<CenterPositionInit, WPos>());
+				returnToCellOnCreation = true;
+			}
 
-			moveIntoWorldDelay = init.Contains<MoveIntoWorldDelayInit>() ? init.Get<MoveIntoWorldDelayInit, int>() : 0;
+			if (init.Contains<CreationActivityDelayInit>())
+				creationActivityDelay = init.Get<CreationActivityDelayInit, int>();
 		}
 
 		protected override void Created(Actor self)
@@ -568,27 +578,27 @@ public Activity MoveFollow(Actor self, Target target, WDist minRange, WDist maxR
 			return WrapMove(new Follow(self, target, minRange, maxRange, initialTargetPosition, targetLineColor));
 		}
 
-		public Activity MoveIntoWorld(Actor self, int delay = 0)
+		public Activity ReturnToCell(Actor self)
 		{
-			return new MoveIntoWorldActivity(self, delay);
+			return new ReturnToCellActivity(self);
 		}
 
-		class MoveIntoWorldActivity : Activity
+		class ReturnToCellActivity : Activity
 		{
-			readonly Actor self;
 			readonly Mobile mobile;
+			readonly bool recalculateSubCell;
 
 			CPos cell;
 			SubCell subCell;
 			WPos pos;
 			int delay;
 
-			public MoveIntoWorldActivity(Actor self, int delay = 0)
+			public ReturnToCellActivity(Actor self, int delay = 0, bool recalculateSubCell = false)
 			{
-				this.self = self;
 				mobile = self.Trait<Mobile>();
 				IsInterruptible = false;
 				this.delay = delay;
+				this.recalculateSubCell = recalculateSubCell;
 			}
 
 			protected override void OnFirstRun(Actor self)
@@ -604,7 +614,7 @@ public override bool Tick(Actor self)
 				cell = mobile.ToCell;
 				subCell = mobile.ToSubCell;
 
-				if (subCell == SubCell.Any)
+				if (recalculateSubCell)
 					subCell = mobile.Info.LocomotorInfo.SharesCell ? self.World.ActorMap.FreeSubCell(cell, subCell) : SubCell.FullCell;
 
 				// TODO: solve/reduce cell is full problem
@@ -898,7 +908,7 @@ string IOrderVoice.VoicePhraseForOrder(Actor self, Order order)
 
 		Activity ICreationActivity.GetCreationActivity()
 		{
-			return MoveIntoWorld(self, moveIntoWorldDelay);
+			return returnToCellOnCreation ? new ReturnToCellActivity(self, creationActivityDelay, returnToCellOnCreationRecalculateSubCell) : null;
 		}
 
 		class MoveOrderTargeter : IOrderTargeter

OpenRA.Mods.Common/Traits/Passenger.cs

@@ -131,6 +131,16 @@ void INotifyEnteredCargo.OnEnteredCargo(Actor self, Actor cargo)
 				if (specificCargoToken == ConditionManager.InvalidConditionToken && Info.CargoConditions.TryGetValue(cargo.Info.Name, out specificCargoCondition))
 					specificCargoToken = conditionManager.GrantCondition(self, specificCargoCondition);
 			}
+
+			// Allow scripted / initial actors to move from the unload point back into the cell grid on unload
+			// This is handled by the RideTransport activity for player-loaded cargo
+			if (self.IsIdle)
+			{
+				// IMove is not used anywhere else in this trait, there is no benefit to caching it from Created.
+				var move = self.TraitOrDefault<IMove>();
+				if (move != null)
+					self.QueueActivity(move.ReturnToCell(self));
+			}
 		}
 
 		void INotifyExitedCargo.OnExitedCargo(Actor self, Actor cargo)

OpenRA.Mods.Common/Traits/Production.cs

@@ -74,7 +74,7 @@ public virtual void DoProduction(Actor self, ActorInfo producee, ExitInfo exitin
 				td.Add(new CenterPositionInit(spawn));
 				td.Add(new FacingInit(initialFacing));
 				if (exitinfo != null)
-					td.Add(new MoveIntoWorldDelayInit(exitinfo.ExitDelay));
+					td.Add(new CreationActivityDelayInit(exitinfo.ExitDelay));
 			}
 
 			self.World.AddFrameEndTask(w =>

OpenRA.Mods.Common/Traits/ProductionParadrop.cs

@@ -127,7 +127,7 @@ public override void DoProduction(Actor self, ActorInfo producee, ExitInfo exiti
 				td.Add(new LocationInit(exit));
 				td.Add(new CenterPositionInit(spawn));
 				td.Add(new FacingInit(initialFacing));
-				td.Add(new MoveIntoWorldDelayInit(exitinfo.ExitDelay));
+				td.Add(new CreationActivityDelayInit(exitinfo.ExitDelay));
 			}
 
 			self.World.AddFrameEndTask(w =>

OpenRA.Mods.Common/TraitsInterfaces.cs

@@ -435,7 +435,7 @@ Activity MoveFollow(Actor self, Target target, WDist minRange, WDist maxRange,
 			WPos? initialTargetPosition = null, Color? targetLineColor = null);
 		Activity MoveToTarget(Actor self, Target target,
 			WPos? initialTargetPosition = null, Color? targetLineColor = null);
-		Activity MoveIntoWorld(Actor self, int delay = 0);
+		Activity ReturnToCell(Actor self);
 		Activity MoveIntoTarget(Actor self, Target target);
 		Activity VisualMove(Actor self, WPos fromPos, WPos toPos);
 		int EstimatedMoveDuration(Actor self, WPos fromPos, WPos toPos);