86 lines
2.1 KiB
C#
86 lines
2.1 KiB
C#
#region Copyright & License Information
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/*
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* Copyright 2007-2010 The OpenRA Developers (see AUTHORS)
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* This file is part of OpenRA, which is free software. It is made
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* available to you under the terms of the GNU General Public License
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* as published by the Free Software Foundation. For more information,
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* see LICENSE.
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*/
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#endregion
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Linq;
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using OpenRA.FileFormats;
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namespace OpenRA.Traits
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{
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public class UnitInfluenceInfo : ITraitInfo
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{
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public object Create( ActorInitializer init ) { return new UnitInfluence( init.world ); }
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}
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public class UnitInfluence
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{
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class InfluenceNode
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{
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public InfluenceNode next;
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public Actor actor;
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}
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InfluenceNode[,] influence;
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Map map;
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public UnitInfluence( World world )
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{
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map = world.Map;
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influence = new InfluenceNode[world.Map.MapSize.X, world.Map.MapSize.Y];
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world.ActorRemoved += a => Remove( a, a.TraitOrDefault<IOccupySpace>() );
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}
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public IEnumerable<Actor> GetUnitsAt( int2 a )
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{
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if (!map.IsInMap(a)) yield break;
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for( var i = influence[ a.X, a.Y ] ; i != null ; i = i.next )
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yield return i.actor;
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}
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public bool AnyUnitsAt(int2 a)
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{
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return /*map.IsInMap(a) && */influence[ a.X, a.Y ] != null;
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}
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public void Add( Actor self, IOccupySpace unit )
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{
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foreach( var c in unit.OccupiedCells() )
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influence[ c.X, c.Y ] = new InfluenceNode { next = influence[ c.X, c.Y ], actor = self };
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}
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public void Remove( Actor self, IOccupySpace unit )
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{
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if (unit != null)
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foreach (var c in unit.OccupiedCells())
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RemoveInner( ref influence[ c.X, c.Y ], self );
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}
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void RemoveInner( ref InfluenceNode influenceNode, Actor toRemove )
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{
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if( influenceNode == null )
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return;
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else if( influenceNode.actor == toRemove )
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influenceNode = influenceNode.next;
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else
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RemoveInner( ref influenceNode.next, toRemove );
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}
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public void Update(Actor self, IOccupySpace unit)
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{
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Remove(self, unit);
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if (!self.IsDead()) Add(self, unit);
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}
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}
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}
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