Bring Mods.D2k in line with our new folder/namespace structure

OpenRA.Mods.D2k/Activities/CarryUnit.cs

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+#region Copyright & License Information
+/*
+ * Copyright 2007-2014 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see COPYING.
+ */
+#endregion
+using System;
+using System.Drawing;
+using System.Linq;
+using OpenRA.Activities;
+using OpenRA.Mods.D2k.Traits;
+using OpenRA.Mods.RA;
+using OpenRA.Mods.RA.Activities;
+using OpenRA.Mods.RA.Traits;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.D2k.Activities
+{
+	public class CarryUnit : Activity
+	{
+		readonly Actor self;
+		readonly Actor carryable;
+		readonly IMove movement;
+		readonly Carryable c;
+		readonly AutoCarryall aca;
+		readonly Helicopter helicopter;
+		readonly IPositionable positionable;
+		readonly IFacing cFacing; // Carryable facing
+		readonly IFacing sFacing; // Self facing
+
+		enum State { Intercept, LockCarryable, MoveToCarryable, Turn, Pickup, Transport, Land, Release, Takeoff, Done }
+
+		State state;
+
+		public CarryUnit(Actor self, Actor carryable)
+		{
+			this.self = self;
+			this.carryable = carryable;
+			movement = self.Trait<IMove>();
+			c = carryable.Trait<Carryable>();
+			aca = self.Trait<AutoCarryall>();
+			helicopter = self.Trait<Helicopter>();
+			positionable = carryable.Trait<IPositionable>();
+			cFacing = carryable.Trait<IFacing>();
+			sFacing = self.Trait<IFacing>();
+
+			state = State.Intercept;
+		}
+
+		// Find a suitable location to drop our carryable
+		CPos GetLocationToDrop(CPos requestedPosition)
+		{
+			if (positionable.CanEnterCell(requestedPosition))
+				return requestedPosition;
+
+			var candidateCells = Util.AdjacentCells(self.World, Target.FromCell(self.World, requestedPosition));
+
+			// TODO: This will behave badly if there is no suitable drop point nearby
+			do
+			{
+				foreach (var c in candidateCells)
+					if (positionable.CanEnterCell(c))
+						return c;
+
+				// Expanding dropable cells search area
+				// TODO: This also includes all of the cells we have just checked
+				candidateCells = Util.ExpandFootprint(candidateCells, true);
+			} while (true);
+		}
+
+		// Check if we can drop the unit at our current location.
+		bool CanDropHere()
+		{
+			return positionable.CanEnterCell(self.Location);
+		}
+
+		public override Activity Tick(Actor self)
+		{
+			if (carryable.IsDead)
+			{
+				aca.UnreserveCarryable();
+				return NextActivity;
+			}
+
+			switch (state)
+			{
+				case State.Intercept: // Move towards our carryable
+
+					state = State.LockCarryable;
+					return Util.SequenceActivities(movement.MoveWithinRange(Target.FromActor(carryable), WRange.FromCells(4)), this);
+
+				case State.LockCarryable:
+					// Last check
+					if (c.StandbyForPickup(self))
+					{
+						state = State.MoveToCarryable;
+						return this;
+					} 
+					else
+					{
+						// We got cancelled
+						aca.UnreserveCarryable();
+						return NextActivity;
+					}
+
+				case State.MoveToCarryable: // We arrived, move on top
+
+					if (self.Location == carryable.Location)
+					{
+						state = State.Turn;
+						return this;
+					}
+					else
+						return Util.SequenceActivities(movement.MoveTo(carryable.Location, 0), this);
+
+				case State.Turn: // Align facing and Land
+
+					if (sFacing.Facing != cFacing.Facing)
+						return Util.SequenceActivities(new Turn(self, cFacing.Facing), this);
+					else
+					{
+						state = State.Pickup;
+						return Util.SequenceActivities(new HeliLand(false), new Wait(10), this);
+					}
+
+				case State.Pickup:
+
+					// Remove our carryable from world
+					self.World.AddFrameEndTask(w => carryable.World.Remove(carryable));
+
+					aca.AttachCarryable(carryable);
+					state = State.Transport;
+					return this;
+
+				case State.Transport:
+
+					// Move self to destination
+					var targetl = GetLocationToDrop(c.Destination);
+
+					state = State.Land;
+					return Util.SequenceActivities(movement.MoveTo(targetl, 0), this);
+
+				case State.Land:
+
+					if (!CanDropHere())
+					{
+						state = State.Transport;
+						return this;
+					}
+
+					if (HeliFly.AdjustAltitude(self, helicopter, helicopter.Info.LandAltitude))
+						return this;
+					else
+					{
+						state = State.Release;
+						return Util.SequenceActivities(new Wait(15), this);
+					}
+
+				case State.Release:
+
+					if (!CanDropHere())
+					{
+						state = State.Transport;
+						return this;
+					}
+
+					positionable.SetPosition(carryable, self.Location, SubCell.FullCell);
+
+					cFacing.Facing = sFacing.Facing;
+
+					// Put back into world
+					self.World.AddFrameEndTask(w => carryable.World.Add(carryable));
+
+					// Unlock carryable
+					aca.CarryableReleased();
+					c.Dropped();
+
+					state = State.Done;
+					return Util.SequenceActivities(new Wait(10),  this);
+
+				case State.Done:
+
+					self.Trait<AutoCarryall>().UnreserveCarryable();
+					return NextActivity;
+			}
+
+			return NextActivity;
+		}
+
+		public override void Cancel(Actor self)
+		{
+			// TODO: Drop the unit at the nearest available cell
+		}
+	}
+}