public override void Execute()
{
Push push = new Push(Destination);
level.Actor.DoMove(push);
}
/// <summary>
/// Attempt to relocate to the another cell
/// using the route in the specified <see cref="Push"/> instance.
/// </summary>
/// <param name="push">The push.</param>
/// <returns><code>true</code> if the move succeeded,
/// <code>false</code> otherwise.</returns>
internal bool DoMove(Push push)
{
bool result = false;
if (push.Undo)
{
lock (moveLock)
{
for (int i = push.Route.Length - 1; i >= 0; i--)
{
Move move = push.Route[i];
Location moveLocation = Location.GetAdjacentLocation(push.Route[i].Direction.GetOppositeDirection());
Cell toCell = Level[moveLocation];
Cell fromCell = this.Cell;
if (!toCell.TrySetContents(this))
{
throw new SokobanException("Unable to follow route.");
}
if (move.PushedContents != null)
{
if (!fromCell.TrySetContents(move.PushedContents))
{
throw new SokobanException("Unable to undo set contents.");
}
}
}
MoveCount -= push.Route.Length;
result = true;
}
}
else
{
WaitCallback callback = delegate(object state)
{
#region Anonymous Push method.
lock (moveLock)
{
PushPathFinder pathFinder = new PushPathFinder(Cell, push.Desrination);
if (pathFinder.TryFindPath())
{
for (int i = 0; i < pathFinder.Route.Length; i++)
{
Move move = pathFinder.Route[i];
/* Sleep for the stepDelay period. */
Thread.Sleep(stepDelay);
Location moveLocation = Location.GetAdjacentLocation(move.Direction);
Cell toCell = Level[moveLocation];
if (!toCell.CanEnter && toCell.CellContents is Treasure)
{
move.PushedContents = toCell.CellContents;
if (!toCell.TryPushContents(move.Direction))
{
throw new SokobanException("Unable to push contents.");
}
}
if (!toCell.TrySetContents(this))
{
throw new SokobanException("Unable to follow route.");
}
MoveCount++;
}
/* Set the undo item. */
Push newMove = new Push(pathFinder.Route)
{
Undo = true
};
moves.Push(newMove);
result = true;
}
}
#endregion
};
ThreadPool.QueueUserWorkItem(callback);
}
return(result);
}