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Mikhail 2023-12-25 08:59:00 +08:00
parent 2f5c172c4e
commit 970f22510b
7 changed files with 285 additions and 284 deletions
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4
src/Builtin/EcsArcWorld.cs Normal file
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@ -0,0 +1,4 @@
namespace DCFApixels.DragonECS
{
public sealed class EcsArcWorld : EcsWorld { }
}

4
src/Builtin/EcsEdgeWorld.cs
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@ -1,4 +0,0 @@
namespace DCFApixels.DragonECS
{
public sealed class EcsEdgeWorld : EcsWorld { }
}

206
src/EcsArc.cs Normal file
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@ -0,0 +1,206 @@
using DCFApixels.DragonECS.Relations.Utils;
using System;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
namespace DCFApixels.DragonECS
{
//Edge world
//Relation entity
//Relation component
public class EcsEdge
{
}
public class EcsArc : IEcsWorldEventListener, IEcsEntityEventListener
{
private readonly EcsWorld _startWorld;
private readonly EcsWorld _endWorld;
private readonly EcsArcWorld _arcWorld;
private readonly VertexWorldHandler _worldHandler;
private readonly IdsBasket _basket = new IdsBasket(256);
private readonly SparseArray64<int> _relationsMatrix = new SparseArray64<int>();
private ArcEntityInfo[] _arkEntityInfos; //N * (N - 1) / 2
#region Properties
public EcsWorld StartWorld => _startWorld;
public EcsWorld EndWorld => _endWorld;
public EcsArcWorld ArcWorld => _arcWorld;
public bool IsLoop => _startWorld == _endWorld;
#endregion
#region Constructors
internal EcsArc(EcsWorld world, EcsWorld otherWorld, EcsArcWorld arcWorld)
{
_arcWorld = arcWorld;
_startWorld = world;
_endWorld = otherWorld;
_worldHandler = new VertexWorldHandler(this, _startWorld, _basket);
_startWorld.AddListener(_worldHandler);
_arkEntityInfos = new ArcEntityInfo[arcWorld.Capacity];
_arcWorld.AddListener(worldEventListener: this);
_arcWorld.AddListener(entityEventListener: this);
}
#endregion
#region New/Del
public int New(int startEntityID, int endEntityID)
{
if (Has(startEntityID, endEntityID))
throw new EcsRelationException();
int arcEntity = _arcWorld.NewEntity();
_basket.AddToHead(startEntityID, endEntityID);
_relationsMatrix.Add(startEntityID, endEntityID, arcEntity);
_arkEntityInfos[arcEntity] = new ArcEntityInfo(startEntityID, endEntityID);
return arcEntity;
}
public void Del(int startEntityID, int endEntityID)
{
if (!_relationsMatrix.TryGetValue(startEntityID, endEntityID, out int e))
throw new EcsRelationException();
_relationsMatrix.Remove(startEntityID, endEntityID);
_basket.DelHead(startEntityID);
_arcWorld.DelEntity(e);
_arkEntityInfos[e] = ArcEntityInfo.Empty;
}
#endregion
#region Get/Has
public bool Has(int startEntityID, int endEntityID)
{
return _relationsMatrix.Contains(startEntityID, endEntityID);
}
//public bool HasRelationWith(EcsSubject subject, int entityID, int otherEntityID)
//{
// if (subject.World != _relationWorld)
// throw new ArgumentException();
// return _source._relationsMatrix.TryGetValue(entityID, otherEntityID, out int entity) && subject.IsMatches(entity);
//}
public int Get(int startEntityID, int endEntityID)
{
if (!_relationsMatrix.TryGetValue(startEntityID, endEntityID, out int e))
throw new EcsRelationException();
return e;
}
public bool TryGet(int startEntityID, int endEntityID, out int arcEntityID)
{
return _relationsMatrix.TryGetValue(startEntityID, endEntityID, out arcEntityID);
}
//public bool TryGetRelation(EcsSubject subject, int entityID, int otherEntityID, out int entity)
//{
// return _source._relationsMatrix.TryGetValue(entityID, otherEntityID, out entity) && subject.IsMatches(entity);
//}
//#region GetRelations
//private IdsLinkedList.Span GetRelations(int entityID)
//{
// return _basket.GetSpanFor(entityID);
//}
////ReadOnlySpan<int> временная заглушка, потому тут будет спан из линкедлиста
////public ReadOnlySpan<int> GetRelationsWith(EcsSubject subject, int entityID)
////{
//// if (subject.World != _relationWorld)
//// throw new ArgumentException();
//// throw new NotImplementedException();
////}
//#endregion
#endregion
#region ArcEntityInfo
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public bool IsArc(int arcEntityID)
{
if (arcEntityID <= 0 || arcEntityID >= _arkEntityInfos.Length)
return false;
return !_arkEntityInfos[arcEntityID].IsEmpty;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public ArcEntityInfo GetArcInfo(int arcEntityID)
{
if (arcEntityID <= 0 || arcEntityID >= _arkEntityInfos.Length)
throw new Exception();
return _arkEntityInfos[arcEntityID];
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public int GetArcStart(int arcEntityID)
{
return GetArcInfo(arcEntityID).start;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public int GetArcEnd(int arcEntityID)
{
return GetArcInfo(arcEntityID).end;
}
#endregion
#region Other
public EcsArc GetInversetArc()
{
return _endWorld.GetArcWith(_startWorld);
}
public bool TryGetInversetArc(out EcsArc arc)
{
return _endWorld.TryGetArcWith(_startWorld, out arc);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public IdsLinkedList.Span Get(int entityID) => _basket.GetSpanFor(entityID);
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public IdsLinkedList.LongSpan GetLongs(int entityID) => _basket.GetLongSpanFor(_startWorld, entityID);
#endregion
#region Callbacks
void IEcsWorldEventListener.OnWorldResize(int newSize)
{
Array.Resize(ref _arkEntityInfos, newSize);
}
void IEcsWorldEventListener.OnReleaseDelEntityBuffer(ReadOnlySpan<int> buffer) { }
void IEcsWorldEventListener.OnWorldDestroy() { }
void IEcsEntityEventListener.OnNewEntity(int entityID) { }
void IEcsEntityEventListener.OnDelEntity(int entityID)
{
ref ArcEntityInfo rel = ref _arkEntityInfos[entityID];
if (_relationsMatrix.Contains(rel.start, rel.end))
Del(rel.start, rel.end);
}
#endregion
#region VertexWorldHandler
private class VertexWorldHandler : IEcsEntityEventListener
{
private readonly EcsArc _source;
private readonly EcsWorld _world;
private readonly IdsBasket _basket;
public VertexWorldHandler(EcsArc source, EcsWorld world, IdsBasket basket)
{
_source = source;
_world = world;
_basket = basket;
}
public void OnDelEntity(int entityID)
{
var span = _basket.GetSpanFor(entityID);
foreach (var arcEntityID in span)
{
}
}
public void OnNewEntity(int entityID)
{
}
}
#endregion
}
}

213
src/EcsEdge.cs
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@ -1,213 +0,0 @@
using DCFApixels.DragonECS.Relations.Utils;
using System;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
namespace DCFApixels.DragonECS
{
//Edge world
//Relation entity
//Relation component
public class EcsEdge : IEcsWorldEventListener, IEcsEntityEventListener
{
private readonly EcsWorld _world;
private readonly EcsWorld _otherWorld;
private readonly EcsEdgeWorld _edgeWorld;
private readonly VertexWorldHandler _worldHandler;
private readonly VertexWorldHandler _otherWorldHandler;
private readonly IdsBasket _basket = new IdsBasket(256);
private readonly IdsBasket _otherBasket = new IdsBasket(256);
private readonly SparseArray64<int> _relationsMatrix = new SparseArray64<int>();
private ArcTargets[] _arkTargets; //N * (N - 1) / 2
private List<WeakReference<EcsJoinGroup>> _groups = new List<WeakReference<EcsJoinGroup>>();
private Stack<EcsJoinGroup> _groupsPool = new Stack<EcsJoinGroup>(64);
#region Properties
public EcsWorld World => _world;
public EcsWorld OtherWorld => _otherWorld;
public EcsEdgeWorld EdgeWorld => _edgeWorld;
public bool IsLoop => _world == _otherWorld;
#endregion
#region Constructors
internal EcsEdge(EcsWorld world, EcsWorld otherWorld, EcsEdgeWorld edgeWorld)
{
_edgeWorld = edgeWorld;
_world = world;
_otherWorld = otherWorld;
_worldHandler = new VertexWorldHandler(this, _world, _basket);
_world.AddListener(_worldHandler);
if (IsLoop)
{
_otherWorldHandler = _worldHandler;
}
else
{
_otherWorldHandler = new VertexWorldHandler(this, _otherWorld, _otherBasket);
_world.AddListener(_otherWorldHandler);
}
_arkTargets = new ArcTargets[edgeWorld.Capacity];
_edgeWorld.AddListener(worldEventListener: this);
_edgeWorld.AddListener(entityEventListener: this);
}
#endregion
#region Join Groups Pool
internal void RegisterGroup(EcsJoinGroup group)
{
_groups.Add(new WeakReference<EcsJoinGroup>(group));
}
internal EcsJoinGroup GetFreeGroup()
{
EcsJoinGroup result = _groupsPool.Count <= 0 ? new EcsJoinGroup(this) : _groupsPool.Pop();
result._isReleased = false;
return result;
}
internal void ReleaseGroup(EcsJoinGroup group)
{
#if (DEBUG && !DISABLE_DEBUG) || !DISABLE_DRAGONECS_ASSERT_CHEKS
if (group.Edge != this) throw new Exception();
#endif
group._isReleased = true;
group.Clear();
_groupsPool.Push(group);
}
#endregion
#region New/Del
public int New(int entityID, int otherEntityID)
{
if (Has(entityID, otherEntityID))
throw new EcsRelationException();
int arcEntity = _edgeWorld.NewEntity();
_basket.AddToHead(entityID, otherEntityID);
_otherBasket.AddToHead(otherEntityID, entityID);
_relationsMatrix.Add(entityID, otherEntityID, arcEntity);
_arkTargets[arcEntity] = new ArcTargets(entityID, otherEntityID);
return arcEntity;
}
public void Del(int entityID, int otherEntityID)
{
if (!_relationsMatrix.TryGetValue(entityID, otherEntityID, out int e))
throw new EcsRelationException();
_relationsMatrix.Remove(entityID, otherEntityID);
_basket.DelHead(entityID);
_otherBasket.Del(entityID);
_edgeWorld.DelEntity(e);
_arkTargets[e] = ArcTargets.Empty;
}
#endregion
#region Get/Has
public bool Has(int entityID, int otherEntityID) => _relationsMatrix.Contains(entityID, otherEntityID);
//public bool HasRelationWith(EcsSubject subject, int entityID, int otherEntityID)
//{
// if (subject.World != _relationWorld)
// throw new ArgumentException();
// return _source._relationsMatrix.TryGetValue(entityID, otherEntityID, out int entity) && subject.IsMatches(entity);
//}
public int Get(int entityID, int otherEntityID)
{
if (!_relationsMatrix.TryGetValue(entityID, otherEntityID, out int e))
throw new EcsRelationException();
return e;
}
private bool TryGet(int entityID, int otherEntityID, out int entity)
{
return _relationsMatrix.TryGetValue(entityID, otherEntityID, out entity);
}
//public bool TryGetRelation(EcsSubject subject, int entityID, int otherEntityID, out int entity)
//{
// return _source._relationsMatrix.TryGetValue(entityID, otherEntityID, out entity) && subject.IsMatches(entity);
//}
//#region GetRelations
//private IdsLinkedList.Span GetRelations(int entityID)
//{
// return _basket.GetSpanFor(entityID);
//}
////ReadOnlySpan<int> временная заглушка, потому тут будет спан из линкедлиста
////public ReadOnlySpan<int> GetRelationsWith(EcsSubject subject, int entityID)
////{
//// if (subject.World != _relationWorld)
//// throw new ArgumentException();
//// throw new NotImplementedException();
////}
//#endregion
#endregion
#region Other
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public bool IsArc(int arcEntityID)
{
if (arcEntityID <= 0 || arcEntityID >= _arkTargets.Length)
return false;
return !_arkTargets[arcEntityID].IsEmpty;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public ArcTargets GetArcTargets(int arcEntityID)
{
if (arcEntityID <= 0 || arcEntityID >= _arkTargets.Length)
throw new Exception();
return _arkTargets[arcEntityID];
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public IdsLinkedList.Span Get(int entityID) => _basket.GetSpanFor(entityID);
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public IdsLinkedList.LongSpan GetLongs(int entityID) => _basket.GetLongSpanFor(_world, entityID);
#endregion
#region Callbacks
void IEcsWorldEventListener.OnWorldResize(int newSize)
{
Array.Resize(ref _arkTargets, newSize);
}
void IEcsWorldEventListener.OnReleaseDelEntityBuffer(ReadOnlySpan<int> buffer) { }
void IEcsWorldEventListener.OnWorldDestroy() { }
void IEcsEntityEventListener.OnNewEntity(int entityID) { }
void IEcsEntityEventListener.OnDelEntity(int entityID)
{
ref ArcTargets rel = ref _arkTargets[entityID];
if (_relationsMatrix.Contains(rel.start, rel.end))
Del(rel.start, rel.end);
}
#endregion
#region VertexWorldHandler
private class VertexWorldHandler : IEcsEntityEventListener
{
private readonly EcsEdge _source;
private readonly EcsWorld _world;
private readonly IdsBasket _basket;
public VertexWorldHandler(EcsEdge source, EcsWorld world, IdsBasket basket)
{
_source = source;
_world = world;
_basket = basket;
}
public void OnDelEntity(int entityID)
{
var span = _basket.GetSpanFor(entityID);
foreach (var arcEntityID in span)
{
}
}
public void OnNewEntity(int entityID)
{
}
}
#endregion
}
}

34
src/EcsJoinGroup.cs
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@ -5,7 +5,7 @@ namespace DCFApixels.DragonECS
{
public class EcsJoinGroup
{
private EcsEdge _source;
private EcsArc _source;
private int[] _mapping;
private int[] _counts;
@ -13,26 +13,26 @@ namespace DCFApixels.DragonECS
internal bool _isReleased = true;
#region Properites
public EcsEdge Edge => _source;
public EcsArc Edge => _source;
#endregion
#region Constrcutors/Dispose
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static EcsJoinGroup New(EcsEdge edge)
{
return edge.GetFreeGroup();
}
internal EcsJoinGroup(EcsEdge edge, int denseCapacity = 64)
{
_source = edge;
_source.RegisterGroup(this);
int capacity = edge.World.Capacity;
_mapping = new int[capacity];
_counts = new int[capacity];
}
public void Dispose() => _source.ReleaseGroup(this);
//[MethodImpl(MethodImplOptions.AggressiveInlining)]
//public static EcsJoinGroup New(EcsArcController edge)
//{
// return edge.GetFreeGroup();
//}
//internal EcsJoinGroup(EcsArcController edge, int denseCapacity = 64)
//{
// _source = edge;
// _source.RegisterGroup(this);
// int capacity = edge.World.Capacity;
//
// _mapping = new int[capacity];
// _counts = new int[capacity];
//}
//public void Dispose() => _source.ReleaseGroup(this);
#endregion
public void Add(int entityFrom, int entityTo)

14
src/Utils/ArcTargets.cs → src/Utils/ArcEntityInfo.cs
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@ -6,9 +6,9 @@ namespace DCFApixels.DragonECS
{
[StructLayout(LayoutKind.Sequential, Pack = 4, Size = 8)]
[Serializable]
public readonly struct ArcTargets : IEquatable<ArcTargets>
public readonly struct ArcEntityInfo : IEquatable<ArcEntityInfo>
{
public static readonly ArcTargets Empty = new ArcTargets();
public static readonly ArcEntityInfo Empty = new ArcEntityInfo();
/// <summary>Start vertex entity ID.</summary>
public readonly int start;
@ -24,7 +24,7 @@ namespace DCFApixels.DragonECS
#endregion
[MethodImpl(MethodImplOptions.AggressiveInlining)]
internal ArcTargets(int startEntity, int endEntity)
internal ArcEntityInfo(int startEntity, int endEntity)
{
start = startEntity;
end = endEntity;
@ -32,15 +32,15 @@ namespace DCFApixels.DragonECS
#region operators
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static bool operator ==(ArcTargets a, ArcTargets b) => a.start == b.start && a.end == b.end;
public static bool operator ==(ArcEntityInfo a, ArcEntityInfo b) => a.start == b.start && a.end == b.end;
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static bool operator !=(ArcTargets a, ArcTargets b) => a.start != b.start || a.end != b.end;
public static bool operator !=(ArcEntityInfo a, ArcEntityInfo b) => a.start != b.start || a.end != b.end;
#endregion
#region Other
public override bool Equals(object obj) => obj is ArcTargets targets && targets == this;
public override bool Equals(object obj) => obj is ArcEntityInfo targets && targets == this;
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public bool Equals(ArcTargets other) => this == other;
public bool Equals(ArcEntityInfo other) => this == other;
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public override int GetHashCode() => ~start ^ end;
public override string ToString() => $"arc({start} -> {end})";

94
src/WorldGraph.cs
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@ -6,40 +6,37 @@ namespace DCFApixels.DragonECS.Relations.Internal
{
internal static class WorldGraph
{
private static readonly SparseArray64<EcsEdge> _matrix = new SparseArray64<EcsEdge>(4);
private static readonly SparseArray64<EcsArc> _matrix = new SparseArray64<EcsArc>(4);
internal static EcsEdge Register(EcsWorld world, EcsWorld otherWorld, EcsEdgeWorld edgeWorld)
internal static EcsArc Register(EcsWorld startWorld, EcsWorld endWorld, EcsArcWorld edgeWorld)
{
int worldID = world.id;
int otherWorldID = otherWorld.id;
int startWorldID = startWorld.id;
int endWorldID = endWorld.id;
#if DEBUG
if (_matrix.Contains(worldID, otherWorldID))
if (_matrix.Contains(startWorldID, endWorldID))
throw new EcsFrameworkException();
#endif
EcsEdge edge = new EcsEdge(world, otherWorld, edgeWorld);
_matrix[worldID, otherWorldID] = edge;
_matrix[otherWorldID, worldID] = edge;
EcsArc edge = new EcsArc(startWorld, endWorld, edgeWorld);
_matrix[startWorldID, endWorldID] = edge;
return edge;
}
internal static void Unregister(EcsWorld world, EcsWorld otherWorld)
internal static void Unregister(EcsWorld startWorld, EcsWorld endWorld)
{
int worldID = world.id;
int otherWorldID = otherWorld.id;
//var manager = _matrix[worldID, otherWorldID];
_matrix.Remove(worldID, otherWorldID);
_matrix.Remove(otherWorldID, worldID);
int startWorldID = startWorld.id;
int endWorldID = endWorld.id;
_matrix.Remove(startWorldID, endWorldID);
}
internal static EcsEdge Get(EcsWorld world, EcsWorld otherWorld)
internal static EcsArc Get(EcsWorld startWorld, EcsWorld otherWorld)
{
#if DEBUG
if (!_matrix.Contains(world.id, otherWorld.id))
if (!_matrix.Contains(startWorld.id, otherWorld.id))
throw new EcsFrameworkException();
#endif
return _matrix[world.id, otherWorld.id];
return _matrix[startWorld.id, otherWorld.id];
}
internal static bool HasEdge(EcsWorld world, EcsWorld otherWorld) => HasEdge(world.id, otherWorld.id);
internal static bool HasEdge(int worldID, int otherWorldID) => _matrix.Contains(worldID, otherWorldID);
internal static bool HasArc(EcsWorld startWorld, EcsWorld endWorld) => HasArc(startWorld.id, endWorld.id);
internal static bool HasArc(int startWorldID, int endWorldID) => _matrix.Contains(startWorldID, endWorldID);
}
}
@ -47,44 +44,55 @@ namespace DCFApixels.DragonECS
{
public static class WorldGraphExtensions
{
public static EcsEdge SetEdgeWithSelf(this EcsWorld self) => SetEdgeWith(self, self);
public static EcsEdge SetEdgeWith(this EcsWorld self, EcsWorld otherWorld)
public static EcsArc SetLoopArc(this EcsWorld self) => SetArcWith(self, self);
public static EcsArc SetArcWith(this EcsWorld self, EcsWorld endWorld)
{
if (self == null || otherWorld == null)
if (self == null || endWorld == null)
throw new ArgumentNullException();
return WorldGraph.Register(self, otherWorld, new EcsEdgeWorld());
}
public static EcsEdge SetEdgeWithSelf(this EcsWorld self, EcsEdgeWorld edgeWorld) => SetEdgeWith(self, self, edgeWorld);
public static EcsEdge SetEdgeWith(this EcsWorld self, EcsWorld otherWorld, EcsEdgeWorld edgeWorld)
{
if (self == null || otherWorld == null || edgeWorld == null)
throw new ArgumentNullException();
return WorldGraph.Register(self, otherWorld, edgeWorld);
return WorldGraph.Register(self, endWorld, new EcsArcWorld());
}
public static bool HasEdgeWithSelf(this EcsWorld self) => HasEdgeWith(self, self);
public static bool HasEdgeWith(this EcsWorld self, EcsWorld otherWorld)
public static EcsArc SetLoopArc(this EcsWorld self, EcsArcWorld edgeWorld) => SetEdgeWith(self, self, edgeWorld);
public static EcsArc SetEdgeWith(this EcsWorld startWorld, EcsWorld endWorld, EcsArcWorld edgeWorld)
{
if (self == null || otherWorld == null)
if (startWorld == null || endWorld == null || edgeWorld == null)
throw new ArgumentNullException();
return WorldGraph.HasEdge(self, otherWorld);
return WorldGraph.Register(startWorld, endWorld, edgeWorld);
}
public static EcsEdge GetEdgeWithSelf(this EcsWorld self) => GetEdgeWith(self, self);
public static EcsEdge GetEdgeWith(this EcsWorld self, EcsWorld otherWorld)
public static bool HasLoopArc(this EcsWorld self) => HasArcWith(self, self);
public static bool HasArcWith(this EcsWorld startWorld, EcsWorld endWorld)
{
if (self == null || otherWorld == null)
if (startWorld == null || endWorld == null)
throw new ArgumentNullException();
return WorldGraph.Get(self, otherWorld);
return WorldGraph.HasArc(startWorld, endWorld);
}
public static void DestroyEdgeWithSelf(this EcsWorld self) => DestroyEdgeWith(self, self);
public static void DestroyEdgeWith(this EcsWorld self, EcsWorld otherWorld)
public static EcsArc GetLoopArc(this EcsWorld self) => GetArcWith(self, self);
public static EcsArc GetArcWith(this EcsWorld startWorld, EcsWorld endWorld)
{
if (self == null || otherWorld == null)
if (startWorld == null || endWorld == null)
throw new ArgumentNullException();
WorldGraph.Get(self, otherWorld).EdgeWorld.Destroy();
WorldGraph.Unregister(self, otherWorld);
return WorldGraph.Get(startWorld, endWorld);
}
public static bool TryGetLoopArc(this EcsWorld self, out EcsArc arc) => TryGetArcWith(self, self, out arc);
public static bool TryGetArcWith(this EcsWorld startWorld, EcsWorld endWorld, out EcsArc arc)
{
if (startWorld == null || endWorld == null)
throw new ArgumentNullException();
bool result = WorldGraph.HasArc(startWorld, endWorld);
arc = result ? WorldGraph.Get(startWorld, endWorld) : null;
return result;
}
public static void DestroyLoopArc(this EcsWorld self) => DestroyArcWith(self, self);
public static void DestroyArcWith(this EcsWorld startWorld, EcsWorld endWorld)
{
if (startWorld == null || endWorld == null)
throw new ArgumentNullException();
WorldGraph.Get(startWorld, endWorld).ArcWorld.Destroy();
WorldGraph.Unregister(startWorld, endWorld);
}
}
}