public static IEnumerable <AoCPoint> Adjacent(this AoCPoint point, bool diagonal)
{
if (diagonal)
{
yield return(point.Up().Left());
}
yield return(point.Up());
if (diagonal)
{
yield return(point.Up().Right());
}
yield return(point.Right());
if (diagonal)
{
yield return(point.Down().Right());
}
yield return(point.Down());
if (diagonal)
{
yield return(point.Down().Left());
}
yield return(point.Left());
}
public static IEnumerable <AoCPoint> Adjacent(this AoCPoint point)
{
yield return(point.Up());
yield return(point.Right());
yield return(point.Down());
yield return(point.Left());
}
public static AoCPoint Left(this AoCPoint point) => new AoCPoint(point.X - 1, point.Y);
public static AoCPoint Down(this AoCPoint point) => new AoCPoint(point.X, point.Y + 1);
public static int GetManhattanDistance(AoCPoint p, int x, int y) => GetManhattanDistance(p.X, p.Y, x, y);
public static int GetManhattanDistance(AoCPoint p1, AoCPoint p2) => GetManhattanDistance(p1.X, p1.Y, p2.X, p2.Y);