Today I learned loops are slow

[bplus]

S'OK live and learn, give my little forumlas a test, might be helpful to you

The sprite index assumes numbering the sprites left to right, top to bottom starting at 0 for first sprite. I would prefer starting at 1 so the top index is the number of sprites but that complicates the math a bit.

So top index is SPR * SPC -1, minus 1 because we start at 0.

Mod is modulus = the remainder left after dividing index by SPC (sprites per...

Dang I think I switched SPR with SPC, oops sorry
SX = (I mod SPR) * SW
SY = int(I / SPC) * SH

Sprites per row, SPR, is how many sprites across the sheet
Sprites per column, SPC, is how many sprites down the sheet

I will dig up an old proggie to verify these...