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/BlocksProjectiles.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.Linq;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("This actor blocks bullets and missiles with 'Blockable' property.")]
+	public class BlocksProjectilesInfo : ConditionalTraitInfo, IBlocksProjectilesInfo
+	{
+		public readonly WDist Height = WDist.FromCells(1);
+
+		[Desc("Determines what projectiles to block based on their allegiance to the wall owner.")]
+		public readonly PlayerRelationship ValidRelationships = PlayerRelationship.Ally | PlayerRelationship.Neutral | PlayerRelationship.Enemy;
+
+		public override object Create(ActorInitializer init) { return new BlocksProjectiles(this); }
+	}
+
+	public class BlocksProjectiles : ConditionalTrait<BlocksProjectilesInfo>, IBlocksProjectiles
+	{
+		public BlocksProjectiles(BlocksProjectilesInfo info)
+			: base(info) { }
+
+		WDist IBlocksProjectiles.BlockingHeight => Info.Height;
+
+		PlayerRelationship IBlocksProjectiles.ValidRelationships { get { return Info.ValidRelationships; } }
+
+		public static bool AnyBlockingActorAt(World world, WPos pos)
+		{
+			var dat = world.Map.DistanceAboveTerrain(pos);
+
+			return world.ActorMap.GetActorsAt(world.Map.CellContaining(pos))
+				.Any(a => a.TraitsImplementing<IBlocksProjectiles>()
+					.Where(t => t.BlockingHeight > dat)
+					.Any(Exts.IsTraitEnabled));
+		}
+
+		public static bool AnyBlockingActorsBetween(World world, Player owner, WPos start, WPos end, WDist width, out WPos hit)
+		{
+			var actors = world.FindBlockingActorsOnLine(start, end, width);
+			var length = (end - start).Length;
+
+			foreach (var a in actors)
+			{
+				var blockers = a.TraitsImplementing<IBlocksProjectiles>()
+					.Where(Exts.IsTraitEnabled).Where(t => t.ValidRelationships.HasRelationship(a.Owner.RelationshipWith(owner)))
+					.ToList();
+
+				if (blockers.Count == 0)
+					continue;
+
+				var hitPos = start.MinimumPointLineProjection(end, a.CenterPosition);
+				var dat = world.Map.DistanceAboveTerrain(hitPos);
+				if ((hitPos - start).Length < length && blockers.Any(t => t.BlockingHeight > dat))
+				{
+					hit = hitPos;
+					return true;
+				}
+			}
+
+			hit = WPos.Zero;
+			return false;
+		}
+	}
+}