Add TurnOnIdle.

AUTHORS

@@ -147,6 +147,7 @@ Also thanks to:
     * Tristan Mühlbacher (MicroBit)
     * UnknownProgrammer
     * Vladimir Komarov (VrKomarov)
+    * Wojciech Walaszek (Voidwalker)
     * Wuschel
 
 Using GNU FreeFont distributed under the GNU GPL

OpenRA.Mods.Common/Traits/TurnOnIdle.cs

@@ -0,0 +1,62 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2020 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, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("Turns actor randomly when idle.")]
+	class TurnOnIdleInfo : ConditionalTraitInfo, Requires<MobileInfo>
+	{
+		[Desc("Minimum amount of ticks the actor will wait before the turn.")]
+		public readonly int MinDelay = 400;
+
+		[Desc("Maximum amount of ticks the actor will wait before the turn.")]
+		public readonly int MaxDelay = 800;
+
+		public override object Create(ActorInitializer init) { return new TurnOnIdle(init, this); }
+	}
+
+	class TurnOnIdle : ConditionalTrait<TurnOnIdleInfo>, INotifyIdle
+	{
+		int currentDelay;
+		int targetFacing;
+		readonly Mobile mobile;
+
+		public TurnOnIdle(ActorInitializer init, TurnOnIdleInfo info)
+			: base(info)
+		{
+			currentDelay = init.World.SharedRandom.Next(Info.MinDelay, Info.MaxDelay);
+			mobile = init.Self.Trait<Mobile>();
+			targetFacing = mobile.Facing;
+		}
+
+		void INotifyIdle.TickIdle(Actor self)
+		{
+			if (IsTraitDisabled)
+				return;
+
+			if (mobile.IsTraitDisabled || mobile.IsTraitPaused)
+				return;
+
+			if (--currentDelay > 0)
+				return;
+
+			if (targetFacing == mobile.Facing)
+			{
+				targetFacing = self.World.SharedRandom.Next(256);
+				currentDelay = self.World.SharedRandom.Next(Info.MinDelay, Info.MaxDelay);
+			}
+
+			mobile.Facing = Util.TickFacing(mobile.Facing, targetFacing, mobile.TurnSpeed);
+		}
+	}
+}

mods/ts/rules/defaults.yaml

@@ -556,6 +556,7 @@
 		Voice: Move
 		Speed: 71
 		Locomotor: foot
+	TurnOnIdle:
 	Selectable:
 		DecorationBounds: 15,23,0,-9
 		Bounds: 24,24,0,-9