Initial commit: OpenRA game engine

Fork from OpenRA/OpenRA with one-click launch script (start-ra.cmd)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

OpenRA.Mods.Common/Traits/Modifiers/HiddenUnderFog.cs

@@ -0,0 +1,41 @@
+#region Copyright & License Information
+/*
+ * Copyright (c) The OpenRA Developers and Contributors
+ * 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
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("The actor stays invisible under fog of war.")]
+	public class HiddenUnderFogInfo : HiddenUnderShroudInfo
+	{
+		public override object Create(ActorInitializer init) { return new HiddenUnderFog(this); }
+	}
+
+	public class HiddenUnderFog : HiddenUnderShroud
+	{
+		public HiddenUnderFog(HiddenUnderFogInfo info)
+			: base(info) { }
+
+		protected override bool IsVisibleInner(Actor self, Player byPlayer)
+		{
+			// If fog is disabled visibility is determined by shroud
+			if (!byPlayer.Shroud.FogEnabled)
+				return base.IsVisibleInner(self, byPlayer);
+
+			if (Info.Type == VisibilityType.Footprint)
+				return byPlayer.Shroud.AnyVisible(self.OccupiesSpace.OccupiedCells());
+
+			var pos = self.CenterPosition;
+			if (Info.Type == VisibilityType.GroundPosition)
+				pos -= new WVec(WDist.Zero, WDist.Zero, self.World.Map.DistanceAboveTerrain(pos));
+
+			return byPlayer.Shroud.IsVisible(pos);
+		}
+	}
+}