factored out flying unit render into WithShadow:IRenderModifier

OpenRa.Game/Traits/WithShadow.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using OpenRa.Game.Graphics;
+
+namespace OpenRa.Game.Traits
+{
+	class WithShadow : IRenderModifier
+	{
+		public WithShadow(Actor self) {}
+
+		public IEnumerable<Tuple<Sprite, float2, int>> ModifyRender(Actor self, IEnumerable<Tuple<Sprite, float2, int>> r)
+		{
+			var unit = self.traits.Get<Unit>();
+			var shadowSprites = r.Select( a => Tuple.New( a.a, a.b, 8 ));
+			var flyingSprites = r.Select( a => Tuple.New( a.a, a.b - new float2( 0, unit.Altitude ), a.c ));
+			return shadowSprites.Concat(flyingSprites);
+		}
+	}
+}