public void MoveForward()
{
int x = this.Position.X;
int y = this.Position.Y;
switch (Direction)
{
case Direction.North:
y++;
break;
case Direction.East:
x++;
break;
case Direction.South:
y--;
break;
case Direction.West:
x--;
break;
default:
throw new ArgumentOutOfRangeException("Invalid value set for Direction enum");
}
Position nextPosition = planet.CalculateOutOfBoundaryPosition(new Position(x, y));
ThrowIfPositionNotClear(nextPosition);
this.Position = nextPosition;
}