Begin iron curtain impl

OpenRa.Game/Traits/IronCurtainable.cs

@@ -0,0 +1,57 @@
+using OpenRa.Game.Traits;
+using OpenRa.Game.Orders;
+using System.Collections.Generic;
+using System.Linq;
+using System.Drawing;
+using OpenRa.Game.Effects;
+using OpenRa.Game.Graphics;
+
+namespace OpenRa.Game.Traits
+{
+	class IronCurtainable: IOrder, IDamageModifier, ITick, IRenderModifier
+	{
+		int RemainingTicks = 0;
+
+		public IronCurtainable(Actor self) { }
+
+		public void Tick(Actor self)
+		{
+			if (RemainingTicks > 0)
+				RemainingTicks--;
+		}
+		public float GetDamageModifier()
+		{
+			return (RemainingTicks > 0) ? 0.0f : 1.0f;
+		}
+		public Order IssueOrder(Actor self, int2 xy, MouseInput mi, Actor underCursor)
+		{
+			return null; // Chronoshift order is issued through Chrome.
+		}
+
+		public void ResolveOrder(Actor self, Order order)
+		{
+			if (order.OrderString == "IronCurtain")
+			{
+				RemainingTicks = (int)(Rules.General.IronCurtain * 60 * 25);
+				// Play active anim
+				var ironCurtain = Game.world.Actors.Where(a => a.Owner == order.Subject.Owner && a.traits.Contains<IronCurtain>()).FirstOrDefault();
+				Sound.Play("ironcur9.aud");
+				if (ironCurtain != null)
+					ironCurtain.traits.Get<RenderBuilding>().PlayCustomAnim(ironCurtain, "active");
+			}
+		}
+
+		public IEnumerable<Renderable> ModifyRender(Actor self, IEnumerable<Renderable> rs)
+		{		
+			if (RemainingTicks <= 0)
+				return rs;
+			
+			List<Renderable> nrs = new List<Renderable>(rs);
+			foreach(var r in rs)
+			{
+				nrs.Add(r.WithPalette(PaletteType.Shadow));
+			}			
+			return nrs;
+		}
+	}
+}