/// <summary>
/// Updates (adds 1 to) priority of specified tile
/// </summary>
/// <param name="row">row index</param>
/// <param name="column">column index</param>
private void UpdatePrioHeap(int row, int column)
{
for (int i = row - 1; i < row + 2; i++)
{
for (int j = column - 1; j < column + 2; j++)
{
if (_ng.AddPrio(i, j))
{
_th.Add(i, j, _ng.GetPrio(i, j));
}
}
}
}
