Move Air activities and traits to Activities\Air and Traits\Air, respectively

OpenRA.Mods.RA/Activities/Air/FallToEarth.cs

@@ -0,0 +1,63 @@
+#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.Linq;
+using OpenRA.GameRules;
+using OpenRA.Mods.RA.Traits;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.RA.Activities
+{
+	public class FallToEarth : Activity
+	{
+		int acceleration = 0;
+		int spin = 0;
+		FallsToEarthInfo info;
+
+		public FallToEarth(Actor self, FallsToEarthInfo info)
+		{
+			this.info = info;
+			if (info.Spins)
+				acceleration = self.World.SharedRandom.Next(2) * 2 - 1;
+		}
+
+		public override Activity Tick(Actor self)
+		{
+			var aircraft = self.Trait<Aircraft>();
+			if (self.CenterPosition.Z <= 0)
+			{
+				if (info.Explosion != null)
+				{
+					var weapon = self.World.Map.Rules.Weapons[info.Explosion.ToLowerInvariant()];
+					// Use .FromPos since this actor is killed. Cannot use Target.FromActor
+					weapon.Impact(Target.FromPos(self.CenterPosition), self, Enumerable.Empty<int>());
+				}
+
+				self.Destroy();
+				return null;
+			}
+
+			if (info.Spins)
+			{
+				spin += acceleration;
+				aircraft.Facing = (aircraft.Facing + spin) % 256;
+			}
+
+			var move = info.Moves ? aircraft.FlyStep(aircraft.Facing) : WVec.Zero;
+			move -= new WVec(WRange.Zero, WRange.Zero, info.Velocity);
+			aircraft.SetPosition(self, aircraft.CenterPosition + move);
+
+			return this;
+		}
+
+		// Cannot be cancelled
+		public override void Cancel(Actor self) { }
+	}
+}