Kill RenderUnitRotor in favour of RenderUnit + WithRotor.

OpenRA.Mods.RA/Render/WithShadow.cs

@@ -0,0 +1,32 @@
+#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 System.Collections.Generic;
+using System.Linq;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.RA.Render
+{
+	class WithShadowInfo : TraitInfo<WithShadow> {}
+
+	class WithShadow : IRenderModifier
+	{
+		public IEnumerable<Renderable> ModifyRender(Actor self, IEnumerable<Renderable> r)
+		{
+			var move = self.Trait<IMove>();
+
+			var shadowSprites = r.Select(a => a.WithPalette("shadow"));
+			var flyingSprites = (move.Altitude <= 0) ? r 
+				: r.Select(a => a.WithPos(a.Pos - new float2(0, move.Altitude)).WithZOffset(move.Altitude));
+
+			return shadowSprites.Concat(flyingSprites);
+		}
+	}
+}