Units automatically path around known hazards (eg static base defenses). Test using SAM and TRAN.

Todo: Ignore hazards when force-moving; Apply only to known enemy hazards; Implement more hazard classes

Also add a few files I forgot from previous patches

OpenRA.Game/Traits/World/AircraftInfluence.cs

@@ -0,0 +1,97 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007,2009,2010 Chris Forbes, Robert Pepperell, Matthew Bowra-Dean, Paul Chote, Alli Witheford.
+ * This file is part of OpenRA.
+ * 
+ *  OpenRA is free software: you can redistribute it and/or modify
+ *  it 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.
+ * 
+ *  OpenRA is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ * 
+ *  You should have received a copy of the GNU General Public License
+ *  along with OpenRA.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using OpenRA.FileFormats;
+
+namespace OpenRA.Traits
+{
+	public class AircraftInfluenceInfo : ITraitInfo
+	{
+		public object Create( ActorInitializer init ) { return new AircraftInfluence( init.world ); }
+	}
+
+	public class AircraftInfluence : ITick
+	{
+		List<Actor>[,] influence;
+		Map map;
+
+		public AircraftInfluence( World world )
+		{
+			map = world.Map;
+			influence = new List<Actor>[world.Map.MapSize.X, world.Map.MapSize.Y];
+			for (int i = 0; i < world.Map.MapSize.X; i++)
+				for (int j = 0; j < world.Map.MapSize.Y; j++)
+					influence[ i, j ] = new List<Actor>();
+
+			world.ActorRemoved += a => Remove( a, a.traits.GetOrDefault<IOccupyAir>() );
+		}
+
+		public void Tick( Actor self )
+		{
+			SanityCheck( self );
+		}
+
+		[Conditional( "SANITY_CHECKS" )]
+		void SanityCheck( Actor self )
+		{
+			for( int x = 0 ; x < self.World.Map.MapSize.X ; x++ )
+				for( int y = 0 ; y < self.World.Map.MapSize.Y ; y++ )
+					if( influence[ x, y ] != null )
+						foreach (var a in influence[ x, y ])
+							if (!a.traits.Get<IOccupyAir>().OccupiedAirCells().Contains( new int2( x, y ) ) )
+								throw new InvalidOperationException( "AIM: Sanity check failed A" );
+
+			foreach( var t in self.World.Queries.WithTraitMultiple<IOccupyAir>() )
+				foreach( var cell in t.Trait.OccupiedAirCells() )
+					if (!influence[cell.X, cell.Y].Contains(t.Actor))
+						throw new InvalidOperationException( "AIM: Sanity check failed B" );
+		}
+
+		Actor[] noActors = { };
+		public IEnumerable<Actor> GetUnitsAt( int2 a )
+		{
+			if (!map.IsInMap(a)) return noActors;
+			return influence[ a.X, a.Y ];
+		}
+
+		public void Add( Actor self, IOccupyAir unit )
+		{
+			foreach( var c in unit.OccupiedAirCells() )
+				influence[c.X, c.Y].Add(self);
+		}
+
+		public void Remove( Actor self, IOccupyAir unit )
+		{
+			if (unit != null)
+				foreach (var c in unit.OccupiedAirCells())
+					influence[c.X, c.Y].Remove(self);
+		}
+
+		public void Update(Actor self, IOccupyAir unit)
+		{
+			Remove(self, unit);
+			if (!self.IsDead) Add(self, unit);
+		}
+	}
+}