Implement EnemyWatcher and AnnounceOnSeen traits

OpenRA.Mods.Common/Traits/Sound/AnnounceOnSeen.cs

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+#region Copyright & License Information
+/*
+ * Copyright 2007-2014 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.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("Players will be notified when this actor becomes visible to them.")]
+	public class AnnounceOnSeenInfo : ITraitInfo
+	{
+		[Desc("Should there be a radar ping on enemies' radar at the actor's location when they see him")]
+		public readonly bool PingRadar = false;
+
+		public readonly string Notification = "EnemyUnitSighted";
+
+		public object Create(ActorInitializer init) { return new AnnounceOnSeen(this); }
+	}
+
+	public class AnnounceOnSeen
+	{
+		public readonly AnnounceOnSeenInfo Info;
+
+		public AnnounceOnSeen(AnnounceOnSeenInfo info)
+		{
+			Info = info;
+		}
+	}
+}