Kill RenderUnitRotor in favour of RenderUnit + WithRotor.

OpenRA.Mods.RA/Render/WithRotor.cs

@@ -0,0 +1,48 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2011 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 OpenRA.Graphics;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.RA.Render
+{
+	public class WithRotorInfo : ITraitInfo
+	{
+		public readonly string Id = "rotor";
+		public readonly int[] Offset = { 0, 0 };
+		public object Create(ActorInitializer init) { return new WithRotor(init.self, this); }
+	}
+
+	public class WithRotor : ITick
+	{
+		public Animation rotorAnim;
+		public WithRotor(Actor self, WithRotorInfo info)
+		{
+			var rs = self.Trait<RenderSimple>();
+			var facing = self.Trait<IFacing>();
+
+			rotorAnim = new Animation(rs.GetImage(self));
+			rotorAnim.PlayRepeating("rotor");
+			rs.anims.Add(info.Id, new RenderSimple.AnimationWithOffset(
+				rotorAnim,
+				() => Combat.GetTurretPosition( self, facing, new Turret(info.Offset)),
+				null ) { ZOffset = 1 } );
+		}
+
+		public void Tick(Actor self)
+		{
+			var isFlying = self.Trait<IMove>().Altitude > 0 && !self.IsDead();
+			if (isFlying ^ (rotorAnim.CurrentSequence.Name != "rotor")) 
+				return;
+
+			rotorAnim.ReplaceAnim(isFlying ? "rotor" : "slow-rotor");
+		}
+	}
+}