give Gap Generator to allies

OpenRA.Game/OpenRA.Game.csproj

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="3.5">
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -150,6 +150,7 @@
     <Compile Include="TraitDictionary.cs" />
     <Compile Include="Traits\Activity.cs" />
     <Compile Include="Traits\Armor.cs" />
+    <Compile Include="Traits\CreatesShroud.cs" />
     <Compile Include="Traits\DrawLineToTarget.cs" />
     <Compile Include="Traits\EditorAppearance.cs" />
     <Compile Include="Traits\EditorTilesetFilter.cs" />
@@ -240,4 +241,4 @@
   <Target Name="AfterBuild">
   </Target>
   -->
-</Project>
+</Project>

OpenRA.Game/Traits/CreatesShroud.cs

@@ -0,0 +1,36 @@
+#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.Linq;
+
+namespace OpenRA.Traits
+{
+	class CreatesShroudInfo : ITraitInfo
+	{
+		public readonly int Range = 0;
+		public object Create(ActorInitializer init) { return new CreatesShroud(this); }
+	}
+
+	class CreatesShroud : ITick
+	{
+		CreatesShroudInfo Info;
+
+		public CreatesShroud(CreatesShroudInfo info)
+		{
+			Info = info;
+		}
+
+		public void Tick(Actor self)
+		{
+			if (!self.TraitsImplementing<IDisable>().Any(d => d.Disabled))
+				self.World.WorldActor.Trait<Shroud>().HideActor(self, Info.Range);
+		}
+	}
+}

OpenRA.Game/Traits/World/Shroud.cs

@@ -112,6 +112,24 @@ namespace OpenRA.Traits
 				Dirty();
 		}
 
+		public void HideActor(Actor a, int range)
+		{
+			if (a.Owner.World.LocalPlayer == null
+				|| a.Owner.Stances[a.Owner.World.LocalPlayer] == Stance.Ally) return;
+
+			var v = new ActorVisibility
+			{
+				vis = GetVisOrigins(a).ToArray()
+			};
+
+			foreach (var p in v.vis)
+				foreach (var q in FindVisibleTiles(a.World, p, range))
+					exploredCells[q.X, q.Y] = visibleCells[q.X, q.Y] > 0;
+
+			if (!Disabled)
+				Dirty();
+		}
+
 		public void UpdatePlayerStance(World w, Player player, Stance oldStance, Stance newStance)
 		{
 			if (oldStance == newStance)