ntg-context September 2021

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by Jano Kula 13 Sep '21

13 Sep '21

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textbackground for text of different size
by Sylvain Hubert 13 Sep '21

13 Sep '21

Dear List, the red highlight block in the following example is not covering the two 40pt characters: \definetextbackground[important][frame=no,background=color,backgroundcolor=red] \starttext abc\important{123{\switchtobodyfont[40pt]45}xy}z \stoptext Is there an option that fixes this? Thanks! Best, Sylvain

1 0

positioning of metapost figure
by Sylvain Hubert 13 Sep '21

13 Sep '21

Dear List, The following code draws a circle at the center of the page, ignoring the "shifted" part. \startuniqueMPgraphic{concept} draw fullcircle scaled 1cm shifted (10cm,10cm); \stopuniqueMPgraphic \defineoverlay[concept][\uniqueMPgraphic{concept}] \setupbackgrounds[page][background=concept] \starttext . \stoptext How should the metapost background figure be positioned correctly? Thanks! Best, Sylvain

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Weird error when using \startformula inside lua
by Aditya Mahajan 12 Sep '21

12 Sep '21

I sometimes define lua functions for showing out worked out calculations. The following minimal example shows that context([[\startformula ... \stopformula]]) fails in LMTX with an error message: tex error > tex error on line 3 in file ./test.tex: Undefined control sequence \undefined MWE: \startluacode thirddata = thirddata or {} local comment = [[ This is a famous formula \startformula a^2 + b^2 = c^2 \stopformula ]] function thirddata.explanation() context(comment) end \stopluacode \starttext \ctxlua{thirddata.explanation()} \stoptext The actual use case is more complicated (where I use templates, so I don't want to convert everything to context.startformula() etc.). The example compiles with MkIV but not LMTX. Any idea what is going on? Thanks, Aditya

3 3

ConTeXt inserts additional dots for Iosevka font
by Marcel Fabian Krüger 12 Sep '21

12 Sep '21

Hi, ConTeXt has some issues with the character variant features of the Iosevka font available at https://github.com/be5invis/Iosevka/releases/download/v10.1.1/super-ttc-ios… E.g. the following document \definefontfeature [default:test] [default] [cv36=2,cv26=6] \definefont [SomeFont] [name:iosevka*default:test] \starttext \SomeFont I live in a dot-heavy world. \stoptext has six dots instead of one dot over each "i". Tests with multiple other font shapers and inspection of the font file confirmed that this is not intentional behavior. Could you take a look at that? (Based on a luotfload bug report at https://github.com/latex3/luaotfload/issues/202) Best regards, Marcel

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Axis macro in MetaFun
by kauśika cittūr 12 Sep '21

12 Sep '21

Dear All, I am truly grateful for the new additions to MetaFun. It has greatly helped me in producing neat drawings for my academic work. In this connection, I have a few queries. Currently I am using PGFPlots (with ConTeXt) to draw simple plots from CSV data. I was wondering if there is any way to do the same in MetaFuns. That is, is it possible to do something like the following in order to obtain a line plot of the values in the 'data.csv' file? Also is it possible to have the 'labels' be the identical for all points in a given list? \startMPcode draw lmt_axis [ sx = 2mm, sy = 2mm, nx = 80, ny = 40, tx = 15, ty = 15, list = { [ connect = true, color = "darkblue", close = true, points = {data.csv}, labels = {"•"}, ] }, ] withpen pencircle scaled 0.5mm; \stopMPcode My final query: is it possible to specify a co-ordinate transform for any/all of the axes? For instance in my work, I would like to plot the y-axis in the log-scale. Thanks, kauśika

2 3

read PDF metadata from other file
by Pablo Rodriguez 11 Sep '21

11 Sep '21

Dear list, I have the following sample: \starttext \setupinteraction [state=start, title={\cldcontext{pdfe.open("b.pdf").Info.Title}}] \null \stoptext From a document composed with \insertpages, I need to transfer medatada. But I get the raw value "feff0061" (which I guess it may be introduced by lpdf.pdfunicode). How can I get the pure text value, so I can transfer metadata from one PDF document into another PDF document? Many thanks for your help, Pablo -- http://www.ousia.tk

2 2

LuaMetaTEX as LaTeX to XHTML/ePub transpiler?
by Hugh Fisher 11 Sep '21

11 Sep '21

I have documents in LaTeX, and would like to generate XHTML (ePub) output without going through an intermediate DVI or PDF step. Markup to markup, translating or transpiling rather than typesetting. My use case is that I have two tabletop gaming books, 60 - 80 pages of text and diagrams, written for pdfLaTeX and now with XeLaTeX. I'm very happy with LaTeX and the wonderful PDF output for print. But now I also want to create ePub/XHTML as well as print versions. So far I've tried tex4ebook and tex4ht and neither works for me. Firstly, some of the LaTeX commands are not recognised or causing errors. And secondly, when I managed to get a small test section to work, the generated XHTML/HTML is very large, full of tiny s. The problem seems to be that tex4ht runs TeX which typesets everything into DVI with every element carefully placed on a page, and then tex4ht tries to reverse that back into HTML. All this extra HTML will slow down / interfere with the ebook reader which is doing the final page layout at runtime on a particular device. How I would like it to work is directly from LaTeX to HTML without any low level typesetting. If I have a LaTex source paragraph This is some text with \textbf{some parts} in bold. The <whatever>TEX will copy the source text to the destination. If there's a TeX command, here \textbf, it looks for a Lua function with that name and invokes it with whatever argument text is present. The Lua function emits , then recursively processes the argument text, then emits . Similarly there would be an implied lookup of \beginParagraph and \endParagraph which would emit and . Plain text just gets copied through unchanged. So (finally) my question: is LuaMetaTEX what I'm looking for? Yes is the answer I'm hoping for. And any guidance would be much appreciated. No, but best starting point? I've never tried modifying TeX code itself, but I am an experienced and sometimes competent programmer. who has written a compiler parser and a high level code generator. No and not a good idea to try? Any other responses? -- cheers, Hugh Fisher

4 9

Default page layout
by kauśika cittūr 11 Sep '21

11 Sep '21

Dear List, I am using LMTX 2021.08.30 19:56. I have the following example – \starttext \showlayout \input knuth \stoptext which yields an output (attached here) with a "asymmetric" layout. Am I doing something wrong? Or have I missed something? Please advise. Thanks, kauśika

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If you really absolutely need more capacity, you can ask a wizard to enlarge me
by Marcus Vinicius Mesquita 10 Sep '21

10 Sep '21

Dear list, In the MWE below, ConTeXt lmtx throws an error with the message in the title: \starttext \startluacode local upperlimit = 90000 context.starttabulate({ "|l|l|l|" }) for i=1,upperlimit do context.NC() context("word 1") context.NC() context("word 2") context.NC() context("word 3") context.NC() context.AR() end context.stoptabulate() \stopluacode \stoptext But it compiles with no problems with MKIV. context version: 2021.09.06 11:47 How to avoid this with lmtx? TIA Marcus Vinicius -- Todas as coisas fatigam o corpo, salvo a música, que não fatiga nem o corpo nem seus membros, por ser descanso da alma, primavera do coração, distração do aflito, entretenimento do solitário, e viático do viajante. Kunnâsh al-Hâ'ik (Cancioneiro de al-Hâ'ik)

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ntg-context September 2021