Implement ground-level bridge destruction and repair.

OpenRA.Mods.Common/Traits/World/BridgeLayer.cs

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+#region Copyright & License Information
+/*
+ * Copyright 2007-2016 The OpenRA Developers (see AUTHORS)
+ * 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 OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	interface IBridgeSegment
+	{
+		void Repair(Actor repairer);
+		void Demolish(Actor saboteur);
+
+		string Type { get; }
+		DamageState DamageState { get; }
+		CVec[] NeighbourOffsets { get; }
+		bool Valid { get; }
+		CPos Location { get; }
+	}
+
+	class BridgeLayerInfo : ITraitInfo
+	{
+		public object Create(ActorInitializer init) { return new BridgeLayer(init.World); }
+	}
+
+	class BridgeLayer
+	{
+		readonly CellLayer<Actor> bridges;
+
+		public BridgeLayer(World world)
+		{
+			bridges = new CellLayer<Actor>(world.Map);
+		}
+
+		public Actor this[CPos cell] { get { return bridges[cell]; } }
+
+		public void Add(Actor b)
+		{
+			var buildingInfo = b.Info.TraitInfo<BuildingInfo>();
+			foreach (var c in FootprintUtils.PathableTiles(b.Info.Name, buildingInfo, b.Location))
+				bridges[c] = b;
+		}
+
+		public void Remove(Actor b)
+		{
+			var buildingInfo = b.Info.TraitInfo<BuildingInfo>();
+			foreach (var c in FootprintUtils.PathableTiles(b.Info.Name, buildingInfo, b.Location))
+				if (bridges[c] == b)
+					bridges[c] = null;
+		}
+	}
+}