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/Pathfinder/GridPathGraph.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;
+using OpenRA.Mods.Common.Traits;
+
+namespace OpenRA.Mods.Common.Pathfinder
+{
+	/// <summary>
+	/// A dense pathfinding graph that supports a search over all cells within a <see cref="Grid"/>.
+	/// Cells outside the grid area are deemed unreachable and will not be considered.
+	/// It implements the ability to cost and get connections for cells, and supports <see cref="ICustomMovementLayer"/>.
+	/// </summary>
+	sealed class GridPathGraph : DensePathGraph
+	{
+		readonly CellInfo[] infos;
+		readonly Grid grid;
+
+		public GridPathGraph(Locomotor locomotor, Actor actor, World world, BlockedByActor check,
+			Func<CPos, int> customCost, Actor ignoreActor, bool laneBias, bool inReverse, Grid grid)
+			: base(locomotor, actor, world, check, customCost, ignoreActor, laneBias, inReverse)
+		{
+			infos = new CellInfo[grid.Width * grid.Height];
+			this.grid = grid;
+		}
+
+		protected override bool IsValidNeighbor(CPos neighbor)
+		{
+			// Enforce that we only search within the grid bounds.
+			return grid.Contains(neighbor);
+		}
+
+		int InfoIndex(CPos pos)
+		{
+			return
+				(pos.Y - grid.TopLeft.Y) * grid.Width +
+				(pos.X - grid.TopLeft.X);
+		}
+
+		public override CellInfo this[CPos pos]
+		{
+			get => infos[InfoIndex(pos)];
+			set => infos[InfoIndex(pos)] = value;
+		}
+	}
+}