July 2022 - ntg-context - NTG Mailing Lists

no greyscales in MetaFun any more?
by Henning Hraban Ramm 21 Jul '22

21 Jul '22

Hi Hans et al., all my greys are black: % MWE: \startMPpage fill unitsquare scaled 10mm withcolor .5; \stopMPpage % real life example: \startMPpage % grayscale squares for s=5 step 5 until 95: numeric c; c := s/100; fill unitsquare scaled 5mm shifted (0,(s-5)*mm) withcolor c; label.lft(100-s, (0, (s-2.5)*mm)); endfor; \stopMPpage This used to work with previous LMTX versions. Hraban

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Bug in startalign
by Stefan Haller 21 Jul '22

21 Jul '22

Hi! I (presumably) found a bug in the recent math changes of the latest upload. If a cell of the startalign environment is empty, something internally to the macro seems to be breaking. Minimal example: \starttext \startformula \startalign \NC \NC a \NR \NC b \NC c \NR \stopalign \stopformula \stoptext Error: > tex error > tex error on line 5 in file ./test.tex: Missing number, treated as zero > <to be read again> > \23C>1 > <template> > \math_next_in_eqalign \math_left_of_eqalign \mathbeginclass \csname \??mathendclass \the \numexpr \c_math_eqalign_column -\plusone \relax \endcsname > \startforceddisplaymath \everycr \emptytoks > <to be read again> > a > <line 3.5> Filling the empty cell with e.g. "d" makes it work. Using "\strut" or "\quad" or similar also leads to the same error. Best regards, Stefan Haller

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If a Font Has Ligature Glyphs But No Feature?
by Michael Urban 21 Jul '22

21 Jul '22

I downloaded something that purports to be Century Expanded from fontsgeek.com. Although the font has fi and fl ligature glyphs, it does not have a ligature font feature and ConTeXt does not use those glyphs. Aside from purchasing a real font product from Linotype at enormous expense and hoping it is better equipped, is there a way to coerce ConTeXt into using the ligature glyphs for fi and fl?

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How to setup a headertext in a doublesided document in a cld?
by Willi Egger 20 Jul '22

20 Jul '22

Hello! I tried to setup a headertext in a context-lua-document. — No problem for the singlesided version, however hoe to pass the info for a double sided version? Unfortunately the cld-mkiv manual contains an example for a singlesided document. It ried context.setupheadertexts({ function() context("\\bf”) context.labeltext(monthname) context("\\hfill”) context(year) end}, {function() context("\\bf”) context.labeltext(monthname) context("\\hfill”) context(year) end}) but this is apparently not the good approach. Does someone of you have experience how to do this correctly? Kind regards Willi

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number of chapters
by Henning Hraban Ramm 20 Jul '22

20 Jul '22

Hi, how do I access the current chapter number and the number of chapters (including appendixes; after the first run)? I’d like to setup a chapter color like \definecolor[ChapterColor][ s=1,v=1, h=360*\namedstructurevariable{chapter}{number}/\numberofchapters, ] and use it for a thumb index... (I can’t access the wiki ATM; downforeveryoneorjustme.com says it would be just me.) Hraban

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Metafun : save memory content ?
by Fabrice L 20 Jul '22

20 Jul '22

Dear list, I’m doing animations in MetaFun, by simply using \startMPpage (…) \stopMPpage for each frame of the animation. Here is an example: https://youtu.be/yhxUbVQx9Uo (please note you can watch it in HD by adjusting the setting in YouTube). This works usually great, but when the number of objects to draw by page is large, the resulting pdf file could be huge, several gigabytes sometimes. Such huge files are difficult (sometimes impossible) to convert in jpeg files (I’m using Image magick for the conversion), necessary to do a mp4 movie. One solution is to do several pdf files, for example one by second; with this option, I can do 60 files of 30 pages, for an animation of 60 seconds (1800 frames for 1 minute). Everything is smoother this way, quicker to convert files. But in order to do so, I have to be able to describe each frame of the animation with the same set of instructions; so the position of an object at time t is described by an equation for example. But this is not always possible. If the animation is based on a random process, the position of an object at time t depends on his position at time t-1. I can still use this preceeding strategy by simulating the past at the begging of each second, starting with a unique random seed. So for example if I work on second 9, I begin by calculating the past from frame 1 to frame 240 (8*30) and then simulate time 241, draw frame 241, simulate time 242, draw time 242, etc.. This could be complicated to do, but is feasible. The drawback is that more I advance in time, the more computations I have to do at the beginning of each file. So to simplify things, one option would be to be save the state of some variables at some point in time, say t, in order to be able to access these informations at time t+1. So the strategy would be : % File second1.pdf for frame =1 to 30 : simulate position of objects ; draw the frame ; endfor; save the position of all objects ; % File second2.pdf Read (access) the position of all objects from second 1(after frame 30); for frame =31 to 60 : simulate position of objects ; draw the frame ; endfor; save the position of all objects ; Etc... Does someone has an idea of how to do such a thing ? I can read text file in Context with no problem and integrate them in the animation process with \startMPinclusions (…) \stopMPinclusions, but I did not find a way to write information from MetaFun to a text file. Is Lua the solution ? Thanks for any help ! Fabrice.

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Sudoku module
by Otared Kavian 18 Jul '22

18 Jul '22

Hi Jairo, You sent a message last year about your Sudoku module, and today, out of curiosity, I wanted to test it. Unfortunately it stops with an error message at line 76 of the file t-sudoku.mkiv, where you have: \def\sudokufunction_direct[#name][#parameters]#content I would appreciate if you could tell me whether you have a working version of you module, or what one has to change in order to typeset your examples. Best regards: Otared

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Interaction broken for formulas in LMTX
by Jairo A. del Rio 15 Jul '22

15 Jul '22

Hi, list! Sorry, I don't have a MWE, but it looks like interactive references for formulas (via \in) are not working after the update. I mean, labels are fine, but they do nothing when clicked. References for tables and figures are fine, though. Best regards, Jairo

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mframed and alignment width
by Hans-Joerg Schurr 14 Jul '22

14 Jul '22

Hello everyone, I'm using \startaligned with pairs and a distance to represent inference steps, one per row. Now I would like to sometimes add a vertical bar to the left of the rows and one below the last row. I was able to achieve this using \mframed, but now the contented inside the framed box doesn't span the entire text width. Here is an example: \starttext \startformula \startalign[m=3, n=1,distance=2em plus 1 fil] \NC 1 \NC 2 \NC 3 \NR \NC 4 \NC 5 \NC 6 \NR \stopalign \stopformula \startformula \mframed[frame=off,bottomframe=on,leftframe=on]{ \startalign[m=3, n=1,distance=2em plus 1 fil] \NC 1 \NC 2 \NC 3 \NR \NC 4 \NC 5 \NC 6 \NR \stopalign} \stopformula \stoptext The second alignment should have the same width as the first one. I played around with the options of \mframed, but could not achieve this. :( I will sneak in a a second small question: how can I adjust the distance between the rows? Thank you very much, Hans-Jörg

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simpleslides module for LMTX
by Henning Hraban Ramm 13 Jul '22

13 Jul '22

Hi y’all, I took over maintenance for the simpleslides module and fixed most problems with LMTX. You can download it here: https://codeberg.org/fiee/context-simpleslides/archive/v2022.07.13.zip I’ll also publish it on modules.contextgarden.net and CTAN ASAP. BTW I left Github for political reasons, you can also find my other ConTeXt stuff at https://codeberg.org/fiee/ Hraban

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