mapS()

Index syten::SQL::Helpers::mapS	(	int	x,
		int	y,
		int	l,
		int	w
	)

Snake-like map.

y->
x  3  2  1  0
|  4  5  6  7
v 11 10  9  8
   .  .  .  .
   .  .  .  .
   .  .  .  .

Parameters

x	length-coordinate, [0, l-1]
y	width-coordinate, [0, w-1]
l	length, [1, …)
w	width, [1, …)

Returns

0-indexed offset from the start if x != -1 != y and 0 denoting a non-diagonal lattice if x == -1 == y.