mapSpiral()

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

Spiral map:

If w is greater than 1:

y->
x  1  2  3  4  5  6  7
| 26 27 28 29 30 31  8
v 25 44 45 46 47 32  9
  24 43 54 55 48 33 10
  23 42 53 56 49 34 11
  22 41 52 51 50 35 12
  21 40 39 38 37 36 13
  20 19 18 17 16 15 14

If w is equal to 1:

x->  l = 18, w = 1 l/2 = 9
0 2 4 6 8 10 12 14 16 17 15 13 11  9  7  5  3  1