getBestIndex function
Return the best index to spread among the list length
when limited to a max
value
When max
is 0 or smaller than length
, returns index
i.e = max=4, length=11
index=0 => 1
index=1 => 4
index=2 => 7
index=3 => 9
Implementation
int getBestIndex(int max, int length, int index) =>
max >= length || max == 0 ? index : 1 + (index * (length / max)).round();