private void AddToGrid(T item, Point cell)
{
List <T> l;
Grid.TryGetValue(cell, out l);
if (l == null)
{
if (ListOfItemQueue.Count > 0)
{
l = ListOfItemQueue.Dequeue();
}
else
{
l = new List <T>();
}
l.Add(item);
Grid.Add(cell, l);
}
else
{
if (!l.Contains(item))
{
l.Add(item);
}
}
}
/// <summary>
/// Removes all items from the given cell.
/// If the items don't occupy another cell, they are removed as well.
/// </summary>
/// <param name="cell">The cell to remove items from</param>
public void Remove(Point cell)
{
lock (lockObject)
{
Point c = Clamp(cell);
List <T> l;
Grid.TryGetValue(c, out l);
if (l != null)
{
foreach (T i in l)
{
List <Point> pl;
ItemDictionary.TryGetValue(i, out pl);
if (pl != null)
{
pl.Remove(c);
if (pl.Count == 0)
{
ListOfPointQueue.Enqueue(pl);
ItemDictionary.Remove(i);
}
}
}
l.Clear();
ListOfItemQueue.Enqueue(l);
Grid.Remove(cell);
}
}
}
