BIM/UIM become traits on World; Added World.WorldActor

OpenRa.Game/Traits/UnitInfluence.cs

@@ -0,0 +1,95 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Diagnostics;
+
+namespace OpenRa.Traits
+{
+	public class UnitInfluenceInfo : ITraitInfo
+	{
+		public object Create( Actor self ) { return new UnitInfluence( self ); }
+	}
+
+	public class UnitInfluence : ITick
+	{
+		List<Actor>[,] influence = new List<Actor>[128, 128];
+		readonly int2 searchDistance = new int2(2,2);
+
+		public UnitInfluence( Actor self )
+		{
+			for (int i = 0; i < 128; i++)
+				for (int j = 0; j < 128; j++)
+					influence[ i, j ] = new List<Actor>();
+
+			self.World.ActorRemoved += a => Remove( a, a.traits.GetOrDefault<IOccupySpace>() );
+		}
+
+		public void Tick( Actor self )
+		{
+			// Does this belong here? NO, but it's your mess.
+			
+			// Get the crushable actors
+			foreach (var a in self.World.Actors.Where(b => b.traits.Contains<ICrushable>()))
+			{
+				// Are there any units in the same cell that can crush this?
+				foreach( var ios in a.traits.WithInterface<IOccupySpace>() )
+					foreach( var cell in ios.OccupiedCells() )
+					{
+						// There should only be one (counterexample: An infantry and a tank try to pick up a crate at the same time.)
+						// If there is more than one, do action on the first crusher
+						var crusher = GetUnitsAt(cell).Where(b => a != b && self.World.IsActorCrushableByActor(a, b)).FirstOrDefault();
+						if (crusher != null)
+						{
+							Log.Write("{0} crushes {1}", crusher.Info.Name, a.Info.Name);
+							// Apply the crush action
+							foreach (var crush in a.traits.WithInterface<ICrushable>())
+								crush.OnCrush(crusher);
+						}
+					}
+			}
+			SanityCheck( self );
+		}
+
+		[Conditional( "SANITY_CHECKS" )]
+		void SanityCheck( Actor self )
+		{
+			for( int y = 0 ; y < 128 ; y++ )
+				for( int x = 0 ; x < 128 ; x++ )
+					if( influence[ x, y ] != null )
+						foreach (var a in influence[ x, y ])
+							if (!a.traits.Get<IOccupySpace>().OccupiedCells().Contains( new int2( x, y ) ) )
+								throw new InvalidOperationException( "UIM: Sanity check failed A" );
+
+			foreach( Actor a in self.World.Actors )
+				foreach( var ios in a.traits.WithInterface<IOccupySpace>() )
+					foreach( var cell in ios.OccupiedCells() )
+						if (!influence[cell.X, cell.Y].Contains(a))
+							throw new InvalidOperationException( "UIM: Sanity check failed B" );
+		}
+
+		public IEnumerable<Actor> GetUnitsAt( int2 a )
+		{
+			return influence[ a.X, a.Y ];
+		}
+
+		public void Add( Actor self, IOccupySpace unit )
+		{
+			foreach( var c in unit.OccupiedCells() )
+				influence[c.X, c.Y].Add(self);
+		}
+
+		public void Remove( Actor self, IOccupySpace unit )
+		{
+			if (unit != null)
+				foreach (var c in unit.OccupiedCells())
+					influence[c.X, c.Y].Remove(self);
+		}
+
+		public void Update(Actor self, IOccupySpace unit)
+		{
+			Remove(self, unit);
+			if (!self.IsDead) Add(self, unit);
+		}
+	}
+}