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/World/ResourceClaimLayer.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 System.Linq;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[TraitLocation(SystemActors.World)]
+	[Desc("Allows harvesters to coordinate their operations. Attach this to the world actor.")]
+	public sealed class ResourceClaimLayerInfo : TraitInfo<ResourceClaimLayer> { }
+
+	public sealed class ResourceClaimLayer
+	{
+		readonly Dictionary<CPos, List<Actor>> claimByCell = new(32);
+		readonly Dictionary<Actor, CPos> claimByActor = new(32);
+
+		/// <summary>
+		/// Attempt to reserve the resource in a cell for the given actor.
+		/// </summary>
+		public bool TryClaimCell(Actor claimer, CPos cell)
+		{
+			if (claimByCell.TryGetValue(cell, out var claimers))
+			{
+				// Clean up any stale claims
+				claimers.RemoveAll(a => a.IsDead);
+
+				// Prevent harvesters from the player or their allies fighting over the same cell
+				if (claimers.Any(c => c != claimer && claimer.Owner.IsAlliedWith(c.Owner)))
+					return false;
+			}
+
+			// Remove the actor's last claim, if it has one
+			if (claimByActor.TryGetValue(claimer, out var lastClaim) &&
+				claimByCell.TryGetValue(lastClaim, out var lastClaimers))
+				lastClaimers.Remove(claimer);
+
+			if (claimers == null)
+				claimByCell.Add(cell, claimers = []);
+			claimByActor[claimer] = cell;
+			return true;
+		}
+
+		/// <summary>
+		/// Returns false if the cell is already reserved by an allied actor.
+		/// </summary>
+		public bool CanClaimCell(Actor claimer, CPos cell)
+		{
+			return !claimByCell.TryGetValue(cell, out var claimers) ||
+				!claimers.Any(c => c != claimer && !c.IsDead && claimer.Owner.IsAlliedWith(c.Owner));
+		}
+
+		/// <summary>
+		/// Release the last resource claim made by this actor.
+		/// </summary>
+		public void RemoveClaim(Actor claimer)
+		{
+			if (claimByActor.TryGetValue(claimer, out var lastClaim) &&
+				claimByCell.TryGetValue(lastClaim, out var lastClaimers))
+				lastClaimers.Remove(claimer);
+
+			claimByActor.Remove(claimer);
+		}
+	}
+}