move aircraft code into Mods.RA/Air/

OpenRA.Mods.RA/Air/Fly.cs

@@ -0,0 +1,66 @@
+#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.Collections.Generic;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.RA.Air
+{
+	public class Fly : CancelableActivity
+	{
+		public readonly float2 Pos;
+
+		private Fly( float2 px ) { Pos = px; }
+		
+		public static Fly ToPx( float2 px ) { return new Fly( px ); }
+		public static Fly ToCell( int2 pos ) { return new Fly( Util.CenterOfCell( pos ) ); }
+
+		public override IActivity Tick(Actor self)
+		{
+			var cruiseAltitude = self.Info.Traits.Get<PlaneInfo>().CruiseAltitude;
+
+			if (IsCanceled) return NextActivity;
+
+			var d = Pos - self.CenterLocation;
+			if (d.LengthSquared < 50)		/* close enough */
+				return NextActivity;
+
+			var aircraft = self.Trait<Aircraft>();
+
+			var desiredFacing = Util.GetFacing(d, aircraft.Facing);
+			if (aircraft.Altitude == cruiseAltitude)
+				aircraft.Facing = Util.TickFacing(aircraft.Facing, desiredFacing, aircraft.ROT);
+
+			if (aircraft.Altitude < cruiseAltitude)
+				++aircraft.Altitude;
+
+			FlyUtil.Fly(self, cruiseAltitude);
+			return this;
+		}
+
+		public override IEnumerable<float2> GetCurrentPath()
+		{
+			yield return Pos;
+		}
+	}
+
+	public static class FlyUtil
+	{
+		public static void Fly(Actor self, int desiredAltitude )
+		{
+			var aircraft = self.Trait<Aircraft>();
+			var speed = .2f * aircraft.MovementSpeed;
+			var angle = aircraft.Facing / 128f * Math.PI;
+			aircraft.center += speed * -float2.FromAngle((float)angle);
+			aircraft.Altitude += Math.Sign(desiredAltitude - aircraft.Altitude);
+		}
+	}
+}