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Fixed wrap_range negative index wrapping.

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Revar Desmera 2019-02-04 04:22:36 -08:00
parent d52a0b7ab4
commit 74702b5863
1 changed files with 9 additions and 4 deletions
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13
math.scad
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@ -73,13 +73,18 @@ function reverse(list) = [ for (i = [len(list)-1 : -1 : 0]) list[i] ];
// Returns a slice of the given array, wrapping around past the beginning, if end < start
function wrap_range(list, start, end) =
(end<start)?
let(
l = len(list),
st = start<0? (start%l)+l : (start%l),
en = end<0? (end%l)+l : (end%l)
)
(en<st)?
concat(
[for (i=[start:len(list)-1]) list[i]],
[for (i=[0:end]) list[i]]
[for (i=[st:l-1]) list[i]],
[for (i=[0:en]) list[i]]
)
:
[for (i=[start:end]) list[i]]
[for (i=[st:en]) list[i]]
;