mapM2()

Index syten::SQL::Helpers::mapM2	(	int	x,
		int	y,
		int	l,
		int	w
	)

Meandering map (2 sites):

y->
x  1  4  5  8  9
|  2  3  6  7 10
v 19 18 15 14 11
  20 17 16 13 12
   .  .  .  .  .
   .  .  .  .  .
   .  .  .  .  .

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.

Referenced by mapM2x().

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