Thanks Hans! I can see that bytemaps are going to be very useful. As for needing more than 1024... Thanks again. Best Wishes
On Sun, 11 May 2025, 19:11 Hans Hagen, <j.ha...@xs4all.nl> wrote: > On 5/11/2025 6:07 PM, Keith McKay wrote: > > Hi all, > > > > I've been playing with bytemaps (see the latest LuaMetaFun manual) and I > > have come across a problem when I create more than 15 bytemaps. This > > came about as part of a bigger project where I create a large bytemap > > and then make smaller bytemaps with the data from the large bytemap. > > I've made a MWE below > > > > %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% > > \startMPpage > > i := 1; > > for x = 1 upto 5: > > for y := 1 upto 5: > > newbytemap i of (250,250,3); > > setbytemap i to (floor(uniformdeviate(255) + > > 1),floor(uniformdeviate(255) + 1),floor(uniformdeviate(255) + 1)); > > fill > > unitsquare xyscaled (250,250) shifted ((x) * 255, (y) *255) > > withbytemap i; > > i := i + 1; > > endfor; > > endfor; > > \stopMPpage > > %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% > > > > The MWE above is for a 5 X 5 grid of randomly generated colours and you > > can see that the last 10m squares are black. Changing x or y to 3 will > > give 15 coloured squares, but a 4 X 4 grid and above gives black > > squares above 15 coloured squares. I can't see anything wrong with the > > code so I'm wondering if it is a bug. > > Any advice would be gratefully received. I'm running the latest update > > on a mac mini M1. > > Ah, we have a buglet here. It started out as max 16 bytemaps but then I > bumped to (max) 1024 but forgot to replace some range tests. You can > test the new bin from the compile farm. > > Thanks for keeping me on the edge. Do we need more than 1024? I guess not. > > Hans > > ----------------------------------------------------------------- > Hans Hagen | PRAGMA ADE > Ridderstraat 27 | 8061 GH Hasselt | The Netherlands > tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl > ----------------------------------------------------------------- >
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