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/HiddenUnderShroud.cs

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+#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
+
+using System.Collections.Generic;
+using OpenRA.Graphics;
+using OpenRA.Primitives;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("The actor stays invisible under the shroud.")]
+	public class HiddenUnderShroudInfo : TraitInfo, IDefaultVisibilityInfo
+	{
+		[Desc("Players with these relationships can always see the actor.")]
+		public readonly PlayerRelationship AlwaysVisibleRelationships = PlayerRelationship.Ally;
+
+		[Desc("Possible values are CenterPosition (reveal when the center is visible) and ",
+			"Footprint (reveal when any footprint cell is visible).")]
+		public readonly VisibilityType Type = VisibilityType.Footprint;
+
+		public override object Create(ActorInitializer init) { return new HiddenUnderShroud(this); }
+	}
+
+	public class HiddenUnderShroud : IDefaultVisibility, IRenderModifier
+	{
+		protected readonly HiddenUnderShroudInfo Info;
+
+		public HiddenUnderShroud(HiddenUnderShroudInfo info)
+		{
+			Info = info;
+		}
+
+		protected virtual bool IsVisibleInner(Actor self, Player byPlayer)
+		{
+			if (Info.Type == VisibilityType.Footprint)
+				return byPlayer.Shroud.AnyExplored(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.IsExplored(pos);
+		}
+
+		public bool IsVisible(Actor self, Player byPlayer)
+		{
+			if (byPlayer == null)
+				return true;
+
+			var relationship = self.Owner.RelationshipWith(byPlayer);
+			return Info.AlwaysVisibleRelationships.HasRelationship(relationship) || IsVisibleInner(self, byPlayer);
+		}
+
+		IEnumerable<IRenderable> IRenderModifier.ModifyRender(Actor self, WorldRenderer wr, IEnumerable<IRenderable> r)
+		{
+			return IsVisible(self, self.World.RenderPlayer) ? r : SpriteRenderable.None;
+		}
+
+		IEnumerable<Rectangle> IRenderModifier.ModifyScreenBounds(Actor self, WorldRenderer wr, IEnumerable<Rectangle> bounds)
+		{
+			return bounds;
+		}
+	}
+}