Implement ground-level bridge destruction and repair.

OpenRA.Mods.Common/Traits/Buildings/GroundLevelBridge.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 System.Collections.Generic;
+using System.Linq;
+using OpenRA.GameRules;
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("Bridge actor that can't be passed underneath.")]
+	class GroundLevelBridgeInfo : ITraitInfo, IRulesetLoaded, Requires<BuildingInfo>, Requires<HealthInfo>
+	{
+		public readonly string TerrainType = "Bridge";
+
+		public readonly string Type = "GroundLevelBridge";
+
+		public readonly CVec[] NeighbourOffsets = { };
+
+		[Desc("The name of the weapon to use when demolishing the bridge")]
+		[WeaponReference] public readonly string DemolishWeapon = "Demolish";
+
+		public WeaponInfo DemolishWeaponInfo { get; private set; }
+
+		public void RulesetLoaded(Ruleset rules, ActorInfo ai) { DemolishWeaponInfo = rules.Weapons[DemolishWeapon.ToLowerInvariant()]; }
+
+		public object Create(ActorInitializer init) { return new GroundLevelBridge(init.Self, this); }
+	}
+
+	class GroundLevelBridge : IBridgeSegment, INotifyAddedToWorld, INotifyRemovedFromWorld
+	{
+		public readonly GroundLevelBridgeInfo Info;
+		readonly Actor self;
+		readonly BridgeLayer bridgeLayer;
+		readonly IEnumerable<CPos> cells;
+		readonly Health health;
+
+		public GroundLevelBridge(Actor self, GroundLevelBridgeInfo info)
+		{
+			Info = info;
+			this.self = self;
+			health = self.Trait<Health>();
+
+			bridgeLayer = self.World.WorldActor.Trait<BridgeLayer>();
+			var buildingInfo = self.Info.TraitInfo<BuildingInfo>();
+			cells = FootprintUtils.PathableTiles(self.Info.Name, buildingInfo, self.Location);
+		}
+
+		void UpdateTerrain(Actor self, byte terrainIndex)
+		{
+			foreach (var cell in cells)
+				self.World.Map.CustomTerrain[cell] = terrainIndex;
+
+			var domainIndex = self.World.WorldActor.TraitOrDefault<DomainIndex>();
+			if (domainIndex != null)
+				domainIndex.UpdateCells(self.World, cells);
+		}
+
+		void INotifyAddedToWorld.AddedToWorld(Actor self)
+		{
+			bridgeLayer.Add(self);
+
+			var tileSet = self.World.Map.Rules.TileSet;
+			var terrainIndex = tileSet.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>().CanEnterCell(c))
+						a.Kill(self);
+		}
+
+		void IBridgeSegment.Repair(Actor repairer)
+		{
+			health.InflictDamage(self, repairer, new Damage(-health.MaxHP), true);
+		}
+
+		void IBridgeSegment.Demolish(Actor saboteur)
+		{
+			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, Enumerable.Empty<int>());
+
+				self.World.WorldActor.Trait<ScreenShaker>().AddEffect(15, self.CenterPosition, 6);
+				self.Kill(saboteur);
+			});
+		}
+
+		string IBridgeSegment.Type { get { return Info.Type; } }
+		DamageState IBridgeSegment.DamageState { get { return self.GetDamageState(); } }
+		bool IBridgeSegment.Valid { get { return self.IsInWorld; } }
+		CVec[] IBridgeSegment.NeighbourOffsets { get { return Info.NeighbourOffsets; } }
+		CPos IBridgeSegment.Location { get { return self.Location; } }
+	}
+}