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/Buildings/GroundLevelBridge.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.Collections.Immutable;
+using OpenRA.GameRules;
+using OpenRA.Primitives;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("Bridge actor that can't be passed underneath.")]
+	sealed class GroundLevelBridgeInfo : TraitInfo, IRulesetLoaded, Requires<BuildingInfo>, Requires<IHealthInfo>
+	{
+		public readonly string TerrainType = "Bridge";
+
+		public readonly string Type = "GroundLevelBridge";
+
+		public readonly ImmutableArray<CVec> NeighbourOffsets = [];
+
+		[WeaponReference]
+		[Desc("The name of the weapon to use when demolishing the bridge")]
+		public readonly string DemolishWeapon = "Demolish";
+
+		public WeaponInfo DemolishWeaponInfo { get; private set; }
+
+		[Desc("Types of damage that this bridge causes to units over/in path of it while being destroyed/repaired. Leave empty for no damage types.")]
+		public readonly BitSet<DamageType> DamageTypes = default;
+
+		public void RulesetLoaded(Ruleset rules, ActorInfo ai)
+		{
+			var weaponToLower = (DemolishWeapon ?? string.Empty).ToLowerInvariant();
+			if (!rules.Weapons.TryGetValue(weaponToLower, out var weapon))
+				throw new YamlException($"Weapons Ruleset does not contain an entry '{weaponToLower}'");
+
+			DemolishWeaponInfo = weapon;
+		}
+
+		public override object Create(ActorInitializer init) { return new GroundLevelBridge(init.Self, this); }
+	}
+
+	sealed class GroundLevelBridge : IBridgeSegment, INotifyAddedToWorld, INotifyRemovedFromWorld
+	{
+		public readonly GroundLevelBridgeInfo Info;
+		readonly Actor self;
+		readonly BridgeLayer bridgeLayer;
+		readonly IEnumerable<CPos> cells;
+		readonly IHealth health;
+
+		public GroundLevelBridge(Actor self, GroundLevelBridgeInfo info)
+		{
+			Info = info;
+			this.self = self;
+			health = self.Trait<IHealth>();
+
+			bridgeLayer = self.World.WorldActor.Trait<BridgeLayer>();
+			var buildingInfo = self.Info.TraitInfo<BuildingInfo>();
+			cells = buildingInfo.PathableTiles(self.Location);
+		}
+
+		void UpdateTerrain(Actor self, byte terrainIndex)
+		{
+			foreach (var cell in cells)
+				self.World.Map.CustomTerrain[cell] = terrainIndex;
+		}
+
+		void INotifyAddedToWorld.AddedToWorld(Actor self)
+		{
+			bridgeLayer.Add(self);
+
+			var terrainIndex = self.World.Map.Rules.TerrainInfo.GetTerrainIndex(Info.TerrainType);
+			UpdateTerrain(self, terrainIndex);
+			KillInvalidActorsInFootprint(self);
+		}
+
+		void INotifyRemovedFromWorld.RemovedFromWorld(Actor self)
+		{
+			bridgeLayer.Remove(self);
+
+			UpdateTerrain(self, byte.MaxValue);
+			KillInvalidActorsInFootprint(self);
+		}
+
+		void KillInvalidActorsInFootprint(Actor self)
+		{
+			foreach (var c in cells)
+				foreach (var a in self.World.ActorMap.GetActorsAt(c))
+					if (a.Info.HasTraitInfo<IPositionableInfo>() && !a.Trait<IPositionable>().CanExistInCell(c))
+						a.Kill(self, Info.DamageTypes);
+		}
+
+		void IBridgeSegment.Repair(Actor repairer)
+		{
+			health.InflictDamage(self, repairer, new Damage(-health.MaxHP), true);
+		}
+
+		void IBridgeSegment.Demolish(Actor saboteur, BitSet<DamageType> damageTypes)
+		{
+			self.World.AddFrameEndTask(w =>
+			{
+				if (self.IsDead)
+					return;
+
+				// Use .FromPos since this actor is dead. Cannot use Target.FromActor
+				Info.DemolishWeaponInfo.Impact(Target.FromPos(self.CenterPosition), saboteur);
+
+				self.Kill(saboteur, damageTypes);
+			});
+		}
+
+		string IBridgeSegment.Type => Info.Type;
+		DamageState IBridgeSegment.DamageState => self.GetDamageState();
+		bool IBridgeSegment.Valid => self.IsInWorld;
+		ImmutableArray<CVec> IBridgeSegment.NeighbourOffsets => Info.NeighbourOffsets;
+		CPos IBridgeSegment.Location => self.Location;
+	}
+}