move aircraft code into Mods.RA/Air/

OpenRA.Mods.RA/Air/FallsToEarth.cs

@@ -0,0 +1,80 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2010 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 LICENSE.
+ */
+#endregion
+
+using OpenRA.Mods.RA.Activities;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.RA.Air
+{
+	class FallsToEarthInfo : TraitInfo<FallsToEarth>
+	{
+		[WeaponReference]
+		public readonly string Explosion = null;
+
+		public readonly bool Spins = true;
+		public readonly bool Moves = false;
+	}
+
+	class FallsToEarth : INotifyDamage
+	{
+		public void Damaged(Actor self, AttackInfo e)
+		{
+			if (self.IsDead())
+			{
+				self.Trait<Health>().RemoveOnDeath = false;
+
+				self.CancelActivity();
+				self.QueueActivity(new FallToEarth(self, self.Info.Traits.Get<FallsToEarthInfo>()));
+			}
+		}
+	}
+
+	class FallToEarth : CancelableActivity
+	{
+		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 IActivity Tick(Actor self)
+		{
+			var aircraft = self.Trait<Aircraft>();
+			if (aircraft.Altitude <= 0)
+			{
+				if (info.Explosion != null)
+					Combat.DoExplosion(self, info.Explosion, self.CenterLocation, 0);
+
+				self.Destroy();
+				return null;
+			}
+
+			if (info.Spins)
+			{
+				spin += acceleration;
+				aircraft.Facing = (aircraft.Facing + spin) % 256;
+			}
+
+			if (info.Moves)
+				FlyUtil.Fly(self, aircraft.Altitude);
+
+			aircraft.Altitude--;
+
+			return this;
+		}
+
+		protected override bool OnCancel(Actor self) { return false; }
+	}
+}