Everything is now OpenRA, not OpenRa

OpenRA.Game/Traits/Activities/UnloadCargo.cs

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+#region Copyright & License Information
+/*
+ * Copyright 2007,2009,2010 Chris Forbes, Robert Pepperell, Matthew Bowra-Dean, Paul Chote, Alli Witheford.
+ * This file is part of OpenRA.
+ * 
+ *  OpenRA is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ * 
+ *  OpenRA is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ * 
+ *  You should have received a copy of the GNU General Public License
+ *  along with OpenRA.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#endregion
+
+using System.Linq;
+
+namespace OpenRA.Traits.Activities
+{
+	public class UnloadCargo : IActivity
+	{
+		public IActivity NextActivity { get; set; }
+		bool isCanceled;
+
+		int2? ChooseExitTile(Actor self)
+		{
+			// is anyone still hogging this tile?
+			if (self.World.WorldActor.traits.Get<UnitInfluence>().GetUnitsAt(self.Location).Count() > 1)
+				return null;
+
+			for (var i = -1; i < 2; i++)
+				for (var j = -1; j < 2; j++)
+					if ((i != 0 || j != 0) && 
+						self.World.IsCellBuildable(self.Location + new int2(i, j), 
+							UnitMovementType.Foot))
+						return self.Location + new int2(i, j);
+
+			return null;
+		}
+
+		public IActivity Tick(Actor self)
+		{
+			if (isCanceled) return NextActivity;
+
+			// if we're a thing that can turn, turn to the
+			// right facing for the unload animation
+			var unit = self.traits.GetOrDefault<Unit>();
+			var unloadFacing = self.Info.Traits.Get<CargoInfo>().UnloadFacing;
+			if (unit != null && unit.Facing != unloadFacing)
+				return new Turn(unloadFacing) { NextActivity = this };
+
+			// todo: handle the BS of open/close sequences, which are inconsistent,
+			//		for reasons that probably make good sense to the westwood guys.
+
+			var cargo = self.traits.Get<Cargo>();
+			if (cargo.IsEmpty(self))
+				return NextActivity;
+
+			var ru = self.traits.GetOrDefault<RenderUnit>();
+			if (ru != null)
+				ru.PlayCustomAnimation(self, "unload", null);
+
+			var exitTile = ChooseExitTile(self);
+			if (exitTile == null) 
+				return this;
+
+			var actor = cargo.Unload(self);
+
+			self.World.AddFrameEndTask(w =>
+			{
+				w.Add(actor);
+				actor.traits.Get<Mobile>().TeleportTo(actor, self.Location);
+				actor.CancelActivity();
+				actor.QueueActivity(new Move(exitTile.Value, 0));
+			});
+
+			return this;
+		}
+
+		public void Cancel(Actor self) { NextActivity = null; isCanceled = true; }
+	}
+}