add base attack notification

OpenRA.Mods.RA/Player/BaseAttackNotifier.cs

@@ -0,0 +1,49 @@
+#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;
+using OpenRA.Mods.RA.Buildings;
+using OpenRA.Mods.RA.Effects;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.RA
+{
+	public class BaseAttackNotifierInfo : ITraitInfo
+	{
+		public readonly int NotifyInterval = 30;	/* seconds */
+		public readonly string Audio = "baseatk1.aud";
+
+		public object Create(ActorInitializer init) { return new BaseAttackNotifier(this); }
+	}
+
+	public class BaseAttackNotifier : INotifyDamage
+	{
+		BaseAttackNotifierInfo info;
+
+		public int lastAttackTime;
+		public int2 lastAttackLocation;
+
+		public BaseAttackNotifier(BaseAttackNotifierInfo info) { this.info = info; }
+
+		public void Damaged(Actor self, AttackInfo e)
+		{
+			/* only track last hit against our base */
+			if (!self.HasTrait<Building>())
+				return;
+
+			if (self.World.FrameNumber - lastAttackTime > info.NotifyInterval * 25)
+				Sound.PlayToPlayer(self.Owner, info.Audio);
+
+			lastAttackLocation = self.Location;
+			lastAttackTime = self.World.FrameNumber;
+		}
+	}
+}
+