move aircraft code into Mods.RA/Air/

OpenRA.Mods.RA/Air/HeliAttack.cs

@@ -0,0 +1,58 @@
+#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 System;
+using System.Linq;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.RA.Air
+{
+	public class HeliAttack : CancelableActivity
+	{
+		Target target;
+		public HeliAttack( Target target ) { this.target = target; }
+
+		public override IActivity Tick(Actor self)
+		{
+			if (IsCanceled) return NextActivity;
+			if (!target.IsValid) return NextActivity;
+
+			var limitedAmmo = self.TraitOrDefault<LimitedAmmo>();
+			if (limitedAmmo != null && !limitedAmmo.HasAmmo())
+			{	
+				self.QueueActivity(new HeliReturn());
+				return NextActivity;
+			}
+			
+			var aircraft = self.Trait<Aircraft>();
+			var info = self.Info.Traits.Get<HelicopterInfo>();
+			if (aircraft.Altitude != info.CruiseAltitude)
+			{
+				aircraft.Altitude += Math.Sign(info.CruiseAltitude - aircraft.Altitude);
+				return this;
+			}
+
+			var attack = self.Trait<AttackBase>();
+			var range = attack.GetMaximumRange() - 1;
+			var dist = target.CenterLocation - self.CenterLocation;
+
+			var desiredFacing = Util.GetFacing(dist, aircraft.Facing);
+			aircraft.Facing = Util.TickFacing(aircraft.Facing, desiredFacing, aircraft.ROT);
+			var rawSpeed = .2f * aircraft.MovementSpeed;
+			
+			if (!float2.WithinEpsilon(float2.Zero, dist, range * Game.CellSize))
+				aircraft.center += (rawSpeed / dist.Length) * dist;
+
+			attack.DoAttack( self, target );
+
+			return this;
+		}
+	}
+}