July 2025 - ntg-context - Mailing Lists

Animation using MetaFun
by Jeong Dal 20 Jul '25

20 Jul '25

Dear all, I tried to make an animation which draws Cardioid curve. I found a code which draws Cardioid using circles. Since I’d like to draw it differently, I modified it a little. 1. Define the z[] values in the \startMPdefinitions block 2. Modified the drawing method in \startMPbuffer When I run it, it doesn’t recognize the z[] values defined already. I think that the z[] values are not delivered to \startbuffer. I tried \startMPinclusions, \startMPinitialization, but I couldn’t succeed. 1. How can I deliver the z[] values into the buffer? 2. What is wrong in the following code? Thank you for reading. Best regards, Dalyoung \usemodule[animation] \setupinteraction[state=start] \startMPdefinitions%{Cardioid} path p,q; numeric u, ang,j,num; picture pict; u := 1cm; ang := 360/52; p := fullcircle scaled 5u; for i=0 upto 51: z[i] = 2.5*dir(ang*i)*u; endfor; pict := image ( draw p withpen pencircle scaled 1; ); \stopMPdefinitions \startbuffer[Cardioid][s] draw pict; num := \MPrawvar{Cardioid}{s}; for i = 0 upto num: j := 2i mod 52; draw z[i] -- z[j]; endfor; setbounds currentpicture to boundingbox currentpicture enlarged 2mm ; \stopbuffer \startdocument \startanimation[menu=yes, framerate=7] \dorecurse{52} {\startexpanded \startframe \setupMPvariables[Cardioid][s=\recurselevel] \processMPbuffer[Cardioid] \stopframe \stopexpanded} \stopanimation \stopdocument

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language in tagging and export
by Hans Hagen 18 Jul '25

18 Jul '25

Hi, A while ago there was some demand for language support in tagging and export (which already has some). One approach is to do it automatically, so test {\nl test} test would then be split in pieces but also error prone and maybe non-intentional. But then one can actually wonder about structure there anywaym so this makes more sense: \definehighlight[isdutch] [language=nl,color=darkred] \definehighlight[isgerman] [language=de,color=darkblue] \definestartstop[someczech] [language=cz,color=darkgreen] \definestartstop[somefrench][language=fr,color=darkyellow] % pablo will check the other languages and also the % kind of language tags we want to end up in the pdf % as he will check how viewers 'speak' - yesterday i % suddenly got some english youtube video where the % normally low pitch male voice (that i knew) became % high pitch female dutch for no reason ... and i % never asked for that ... so I fear future pdf % viewers test \isdutch {test} test test \isgerman {test} test test \someczech {test} test test \somefrench{test} test so that is what i added. Now, the question is, what commands (environments) need support for the language key; we have some 70 potential places and 270 possible edits .. oneliners, but kind of boring as we need to expliclty check where it kicks in (probably needs some distracting music on the speaker to get it done) Concerning impact on performance, I tested with 10000 * 2 of the above highlights and got this: % 20K no support : 2.52 % 20K language not set : 2.55 % 20K language set : 3.12 % needs to be compensated so we loose some performance which means i have to gain in back someplace else (kind of regular challenge when adding something) so, the question is 'selective' or 'everywhere' (this is independent of tagging etc ... assuming some structure it's trivial to add there; a general {\nl test} is more tricky as then we need to do more consistency testing, which i got kind of working and then removed again because in the end we then reward sloppy code which is bad and we should stay away from that) 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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weird issue with latest win64 binaries
by Pablo Rodriguez 18 Jul '25

18 Jul '25

Dear list, I‘m afraid that after updating to current latest (2025.07.08 17:48) at work in Win10, the win64 binaries didn’t work at all. Both `context --version` and `luametatex --version` gave the following message (and no more than that): Access denied Since I make a backup before updating, using the previous version is totally fine. Is there anything changed in the compilation that could affect binary execution? Many thanks for your help, Pablo

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Frame/hrules around column content
by Florent Michel 16 Jul '25

16 Jul '25

Hi, I have encountered another issue with columns: it seems that in some cases the height of the content is not entirely accounted for. From the small experiments I made, the problem seems to only occur when the content of the left column is larger than the content of the right one by a fraction of the line height. The example below demonstrates the issue. The same issue seems to occur with \startboxedcolumns ... \stopboxedcolumns but not with \startsimplecolumns ... \stopsimplecolumns. Is there a way to have a frame or hrules around the full content of \startcolumns ... \stopcolumns? _______________________________________________________________________ \starttext % The left frame is slightly too small \startcolumns[n=2,frame=on] Line \par \blank[1.5ex] Line \par Line \par Line \stopcolumns \blank[big] % Same issue with hrules: the lower one overlaps with the content of the left column \hrule \startcolumns[n=2] Line \par \blank[1.5ex] Line \par Line \par Line \stopcolumns \hrule \blank[big] % Same issue with \startframed ... \stopframed \startframed[offset=none] \startcolumns[n=2] Line \par \blank[1.5ex] Line \par Line \par Line \stopcolumns \stopframed \blank[big] % Using strut=local seems to fix the issue in this case... \startframed[offset=none,strut=local] \startcolumns[n=2] Line \par \blank[1.5ex] Line \par Line \par Line \stopcolumns \stopframed \blank[big] % ... but becomes a problem on this example... \startframed[offset=none,strut=local] \startcolumns[n=2] A longer phrase which does not fit on one single line \par Line \par \stopcolumns \stopframed \blank[big] % ... which works fine without strut=local \startframed[offset=none] \startcolumns[n=2] A longer phrase which does not fit on one single line \par Line \par \stopcolumns \stopframed \blank[big] % Using \startsimplecolumns ... \stopsimplecolumns seems to consistently give a good enough frame % (although with maybe a bit too much white space at the bottom in this case) \startframed[offset=none] \startsimplecolumns[n=2] Line \par \blank[1.5ex] Line \par Line \par Line \stopsimplecolumns \stopframed \stoptext _______________________________________________________________________ Cheers, Florent

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Vertical alignment and columns
by Florent Michel 15 Jul '25

15 Jul '25

Hi! I've encountered a (to me) unexpected behaviour with the columns environment: the vertical alignment looks slightly different depending on whether the text fits on a single column or not. The following example demonstrates this behaviour (ConTeXt LMTX version 2025.07.08 17:48 on a 64-bits Linux machine): the first line looks slightly higher than the second one. \starttext \startframed[offset=0pt] \startcolumns This is a test \stopcolumns \stopframed \blank[medium] \startframed[offset=0pt] \startcolumns This is a slightly longer test using two columns \stopcolumns \stopframed \stoptext If this is intended, is there a way to get the same vertical alignment independently of whether the text fits on one or two columns? Cheers, Florent

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Position of formula
by Shiv Shankar Dayal 15 Jul '25

15 Jul '25

Consider following code: \starttext \startitemize[n] \item \startformula \startalign[n=3] \NC S = \NC T_1 + \NC T_2 + T_3 + \cdots + T_n\NR \NC S = \NC \NC T_1 + T_2 + \cdots + T_{n - 1} + T_n\NR \stopalign\stopformula \stopitemize \stoptext The formula is centered below the list enumerator and mid-aligned. How can I align it to left and in the same line as list enumerator. I tried replacing \startformula with $ but then it goes above the list enumerator and is still mid-aligned. I tried setting flushleft and align attributes but they did not work. Thanks in advance for your help. -- Respect, Shiv Shankar Dayal

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ALT-text for images in HTML/EPUB export
by Matthias Weber 14 Jul '25

14 Jul '25

Hello again, When providing an alt-text for images like so (which works for PDFs): \setupexternalfigures[location=default] \setupbackend[export=yes,xhtml=yes] \setupinteraction [state=start] \starttext \startchapter[title=Example] \startsection[title={Section}] \placefigure {} {\externalfigure[hacker.jpg][ label={Look, a $e^{\pi i}+1=0$ hacker!}] } \stopchapter \stoptext the figure becomes in the HTML export <div class="float figure method-here" id="aut-3"> <div class="floatcontent"><div class="image label-Look, a $e^{\\\\pi i}+1=0$ hacker!" id="export-example-image-1" image="export-example-image-1"></div></div> <div class="floatcaption"><div class="floatlabel figure">Figure </div><div class="floatnumber figure">1.1</div></div> </div> How do I turn this into an ALT text in the HTML? Or how do I have to provide the Alt text correctly? And what do I do about Alt texts that contain math? The \\\\pi looks a little strange… Thanks once again, Matthias

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interfaces.implement for key-value list
by Henning Hraban Ramm 14 Jul '25

14 Jul '25

Hi, I’m trying to get a simple function with a variable number of parameters working: """ \startluacode interfaces.implement { name = "Autoren", public = true, arguments = { "hash" }, actions = function(t) logs.report('Autoren', 'interface got table of length ' .. #t) end } \stopluacode \starttext Info: \Autoren[text=Hans,melody=Hraban] \stoptext """ The table t has always length 0. Where’s my error? And is there documentation on interfaces.implement anywhere? Hraban

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Line breaks within TABLE cells
by Kip Warner 14 Jul '25

14 Jul '25

Hello list, I am trying to insert a manual line break inside of a TABLE cell, but can't seem to get it to work. I'm typesetting some mathematical formulae. See below minimal: \starttext \placetable[here,split,none][table:appendix_notation]{} { \bTABLE[split=repeat,option=stretch] \setupTABLE[row][each][align=center] \setupTABLE[column][3][align=right] \bTABLEhead \bTR \bTH Symbol \eTH \bTH Constraints \eTH \bTH Description \eTH \eTR \eTABLEhead \bTABLEbody \bTR \bTC \math{\phi_i} \eTC % I want a line break right where the first comma is in the next line, but inserting a \\ doesn't seem to work \bTC \math{\phi_i \in \mathbb{R},\\ i \in \mathbb{N} \cap [0,\Phi)} \eTC \bTC Some random textual description here. \eTC \eTR \bTR \bTC \math{\underline{\phi}_i} \eTC \bTC \math{\underline{\phi}_i \in \mathbb{R} \cap [0,1], i \in \mathbb{N} \cap [0,\Phi)} \eTC \bTC Some additional random textual description here. \eTC \eTR \eTABLEbody \eTABLE } \stoptext Any help appreciated. -- Kip Warner OpenPGP signed/encrypted mail preferred https://www.thevertigo.com

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HTML/EPUB export: Lost Inheritance in enumerations.
by Matthias Weber 13 Jul '25

13 Jul '25

Dear All, Here is another issue: When defining enumerations, it is useful to use inheritance as in the minimal example inci.tex below. This compiles fine, and both PDF and HTML look good. However, when I style the elements in the exported style sheets, only “theorem" gets styled, not “lemma". In the HTML the Theorem style is invoked using <div class="description Theorem”>, while Lemma gets the generic <div class="description”>. To reproduce this, one needs to add <link type="text/css" rel="stylesheet" href="styles/inci3-templates.css" /> to inci3-div.html (to make the styles available to the html), and in styles/inci3-templates.css one needs to change two styles to description[detail=Theorem], div.description.Theorem { display: block ; border-style: solid; } description[detail=Lemma], div.description.Lemma { display: block ; border-style: solid; } The latter style is never used in inci3-div.html. Thanks once again! Matthias

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