/// <summary>
/// find the first avalible destination index on a line in an indicated direction.
/// the start of the search is the last index in opposite direction.
/// </summary>
public int FindAvalibleDestinationInDirection(MoveDirection direction, uint lineIdx)
{
var destination = -1;
var startIndex = GetLastIndexInDirection(direction.Opposite);
var square = direction.IsHorzOrient() ? this[startIndex, lineIdx] : this[lineIdx, startIndex];
while (square != null && !square.Value.State.IsActive)
{
destination = (int)(direction.IsHorzOrient() ? square.Value.X : square.Value.Y);
square = square.Next(direction.Value);
}
return(square != null ? destination : -1);
}
