/// <summary>
/// Gets the element to the left, it is the Next pointer of the linked list Node
/// and in the case of the last element then it is the first element
/// <param name="currentOrientation">Orientation to move from</param>
/// <returns>Orientation after moving to the left</returns>
public static Orientation ToLeft(Orientation currentOrientation)
{
if (orientationsList.First.Value == currentOrientation)
return orientationsList.Last.Value;
return orientationsList.Find(currentOrientation).Previous.Value;
}
/// <summary>
/// Type constructor initializes the 4 directions object (just to have a handy pointer to them)
/// and adds them in order to the cyclic doubly linked list
/// </summary>
static OrientationsHandler( )
{
orientationsList = new LinkedList<Orientation>();
North = new Orientation(Directions.North);
South = new Orientation(Directions.South);
East = new Orientation(Directions.East);
West = new Orientation(Directions.West);
orientationsList.AddFirst(North);
orientationsList.AddLast(East);
orientationsList.AddLast(South);
orientationsList.AddLast(West);
}
/// <summary>
/// Gets the element to the right, it is the Next pointer of the linked list Node
/// and in the case of the last element then it is the first element
/// </summary>
/// <param name="currentOrientation">Orientation to move from</param>
/// <returns>Orientation after moving to the right</returns>
public static Orientation ToRight(Orientation currentOrientation)
{
if (orientationsList.Last.Value == currentOrientation)
return orientationsList.First.Value;
return orientationsList.Find(currentOrientation).Next.Value;
}
/// <summary>
/// Determines if the Robot is about to fall off the face of the Mars
/// </summary>
/// <param name="CurrentPosition">Current position of the robot</param>
/// <param name="CurrentOrientation">Current orientation of the robot</param>
/// <returns></returns>
private bool WillFallOffMars(Position CurrentPosition, Orientation CurrentOrientation)
{
bool willFall = false;
//checks for edge cases after which the robot will fall
if (
(CurrentOrientation == OrientationsHandler.North && CurrentPosition.Y == Planet.UpperY)
|| (CurrentOrientation == OrientationsHandler.East && CurrentPosition.X == Planet.UpperX)
|| (CurrentOrientation == OrientationsHandler.South && CurrentPosition.Y == 0)
|| (CurrentOrientation == OrientationsHandler.West && CurrentPosition.X == 0)
)
{
willFall = true;
}
return willFall;
}