September 2024 - ntg-context

Envelopes and shaded paths
by Keith McKay 22 Sep '24

22 Sep '24

Hi, I have been playing about with envelopes to produce shaded paths as described in the new LuaMetFun manual, see page 105 therein. Using the code below I wanted to produce a shaded path, in this case a curve and then rotating it in 5 degree steps from 0 to 355 degrees to produce a kind of spiral. Here is the code: \startMPpage pair A,B; path p, psubPath, asPathEnvelope; A = (0cm,0cm);B = (5cm,0cm); p = A{dir 60}.. B; fill fullsquare scaled 12cm withcolor 0.5[blue,white]; for i = 0 step 5 until 355: psubPath := (subpath((0.1 * length p), (1 * length p))of p)rotated i; asPathEnvelope := envelope pensquare scaled 0.5mm of psubPath; fill asPathEnvelope rotated i yscaled 1 withshademethod "linear" withshadecolors (0.5[blue,white],white); endfor; \stopMPpage I had expected to get a series of curves where the outer point of the curve was white, shading down to 0.5[blue,white]at the inner point of the curve. I was expecting the shading to remain that way, however, as the curve is rotated round, the shading effect slowly changes until it is reversed, and as it continues to be rotated it returns to it original shading. Although I quite like that effect, it's a nice feature, I would like to be able to produce the shading the way I wanted. A while back Hans explained to me why this happened and how I could remedy it, but unfortunately my aged memory has failed me and I cant remember how to do it. So I thought the youthful brains of the ConTeXt group may be able to help out, and it might be of interest in any case. I attach a pdf of the spiral effect. Best Wishes Keith McKay

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Same font for metafun as document
by Shiv Shankar Dayal 22 Sep '24

22 Sep '24

Suppose I use dejavu fonts for the main document then how can I have metafun use the same fonts for labelling. All the metafun code is inline. -- Respect, Shiv Shankar Dayal

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issue with "context --pages=reference"
by Pablo Rodriguez 22 Sep '24

22 Sep '24

Dear list, I have the following sample (sample.tex): \setuppagenumbering[alternative=doublesided] \setuphead[chapter][reference=ch\namedheadnumber{chapter}] \starttext \dorecurse{5}{% \startchapter[title={Chapter \namedheadnumber{chapter}}] \dorecurse{\randomnumber{10}{50}} {\input zapf\par} \stopchapter} \stoptext I get no page numbers from: context --pages=ch3 sample.tex BTW, sample.tuc contains: { ["metadata"]=6, ["numberdata"]=10, ["references"]={ ["block"]="bodypart", ["internal"]=4, ["realpage"]=29, ["reference"]="ch3", ["section"]=4, }, Which is the right way to invoke "context --pages=[reference]" or what am I missing here? Many thanks for your help, Pablo

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your favourite ConTeXt debugging tools
by Henning Hraban Ramm 22 Sep '24

22 Sep '24

There’s a growing number of trackers and directives, as well as \show… commands. I’m sure there are some that I could/should use and just don’t know, and there’s just too much to try. Which are your hidden gems or favourite tools? I’ll start: \showlayout: inserts 4 pages of layout dimensions \showmakeup: values of many details, e.g. distances and kerning \showgrid: line grid for grid mode \showframe: all frames \showboxes: draw frames around a few areas \showsetups: list of variables \showbodyfont: variants of tha active font family \showbodyfontenvironment: values of relative sizes \showsymbolset[name]: list of symbols \showstruts \showcolor, \showcolorcomponents \showpalet, \comparepalet \showexternalfigures \showtrackers – or "context --trackers" \showdirectives – or "context --directives" Trackers: builders.hpack.overflow – mark under-/overfull hboxes hyphenation.applied.visualize – show hyphenation https://wiki.contextgarden.net/Trackers/typesetters.suspects https://wiki.contextgarden.net/Trackers/visualizers.justification Directives: pdfview.method=auto (in contextcnf.lua) to change --autopdf default logs.errors=* – make warnings errors(?) logs.quitonerror=* – stop at every error references.bookmarks.preroll – expand(?) macros in bookmarks backend.pdf.nounicode=X – obfuscate text Let’s fill in and complete https://wiki.contextgarden.net/Trackers (the list was made in 2012 and is quite outdated) Hraban

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Problem with context --extra=select
by Michael Guravage 21 Sep '24

21 Sep '24

Greetings, Regardless of the selection criteria, the select tool selects only the first page. This feature works in my ConTeXt versions from 2024.05.17 and 2024.08.13. I'm running the latest version, i.e. 2024.09.17. context --extra=select --selection=11:16 forexample.pdf I've attached the output in a log file if anyone's interested. Any suggestions? -- With kind regards, Michael Guravage <http://literatesolutions.com>

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PDF/UA-2, WTPDF
by Henning Hraban Ramm 20 Sep '24

20 Sep '24

Quoting a post by Philipp Kiff, https://mastodon.social/@pkiff/112219488889350928: In amongst the release of PDF/UA-2 (PDF for Universal Accessibility) and the new Well-Tagged PDF (WTPDF) standard last month, some PDF professionals may have missed two other new resources that may help explain and view them: 1. Questions and Answers about Tagged PDF from PDF association 2. Acrobat Custom File Info Panels by Peter Wyatt Last month saw the release of PDF/UA-2 and the new Well-Tagged PDF (WTPDF) standard - neither of which revokes PDF/UA-1. And none of those are the same as PDF 1.7 vs 2.0. To many, the landscape of PDF specs may now seem littered with confusing acronyms and versions! For some help disentangling it all, the PDF association has a Questions and Answers about Tagged PDF: https://pdfa.org/resource/tagged-pdf-q-a/ In related news, Peter Wyatt released Acrobat Custom File Info Panels. This is a free extension for Acrobat that adds new panels to the XMP metadata shown when you view File > Properties in Acrobat Pro. The new panels allow you to view the additional conformance claims and dated revisions of ISO standards that can now be included in PDFs, but that aren't currently visible in the standard Acrobat panels. https://pdfa.org/discovering-pdf-metadata/ One thing I realized in reading through the new standards and looking at various sample files this week is that I should probably spend some time learning LaTeX! Both LaTeX and LibreOffice are already capable of producing PDF/UA-2 files, and with some tweaking, LaTeX can produce what appear to be really good WTPDF files. Kudos to both those development teams! https://github.com/latex3/tagging-project/discussions/72 Finally, in case you missed earlier posts from last month, here are links to the official sources for the two new PDF standards that these other resources relate to: 1. PDF/UA-2 https://pdfa.org/iso-14289-2-pdfua-2/ 2. Well-Tagged PDF (WTPDF) https://pdfa.org/wtpdf/

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Table and rotation: push together 45 degree rotated cells
by Gerion Entrup 19 Sep '24

19 Sep '24

Hi, I want to typeset a table where some of the column headings are really long, while in the columns itself consists only of numbers. Therefore, my idea was to rotate the column headings but not 90 degrees (I found some solutions for that) but 45 degree. It then would be beneficial to push together the rotated cells, so the text of one cell actually starts above the previous cell. Do you know, how to achieve that? Here is a minimal example: ``` \startsetups[table:rotated] \setupTABLE[frame=off] \setupTABLE[row][first][bottomframe=on, style=bf, align={center, low}] \setupTABLE[row][2][align=flushright] \stopsetups \starttext \define\tablerotate{\dontleavehmode\rotate[rotation=-45, location=high]} \bTABLE[setups=table:rotated] \bTR \bTD \eTD \bTD \tablerotate{Water buffalo} \eTD \bTD \tablerotate{Mexican redknee tarantula} \eTD \bTD \tablerotate{European turtle dove} \eTD \eTR \bTR \bTD Amount of legs \eTD \bTD \digits{4} \eTD \bTD \digits{8} \eTD \bTD \digits{2} \eTD \eTR \eTABLE \stoptext ``` I would like to achieve that the text "Mexican redknee tarantula" is typeset right and above of "Water buffalo" so that the single columns have a width that is similar to the width of the single digit coming in the second row. Another question in this context: Is is possible to specify a \setupTABLE command that works for column 2-4 starting from row 2? Something like \setupTABLE[row][2-][column][2,3,4][background=color, backgroundcolor=red]. In this example this would cover all numbers but nothing else. Best Gerion

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OT: fun tool for understanding Unicode and other text encodings
by Henning Hraban Ramm 19 Sep '24

19 Sep '24

Paste something into https://text.makeup/ and let it explain how an emoji is constructed, what the escaping means etc. You can find examples in the left sidebar. Have fun! HR

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upload
by Hans Hagen 18 Sep '24

18 Sep '24

Hi, I uploaded a new version. Apart from some things discussed here already the main update is in par passes (a bit more control, feedback, tracing etc) which will be explained over time (we're writing a wrapup). 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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Inline equations and html export
by Florent Michel 18 Sep '24

18 Sep '24

Hello, Thanks Hans and everyone who has worked on it for the new upload! I have noticed a change which seems to break XML/html export for inline equations; although I don't know if the issue is with the new version or with how I'm using it. Minimal example: ``` \setupbackend[export=yes] \setupexport[alternative=html] \starttext $1 + 1 = 2$ \stoptext ``` When compiling with ConTeXt 2024.09.17 and opening either the `.html` or `.xhtml` file with Firefox or Chromium, the positions of the 2 and = sign are reversed, while the equation is correctly rendered when using ConTeXt 2024.08.16. The (I think) relevant part of the html code generated by ConTeXt 2024.09.17: ``` <div> <math data-lmtx-blob="1" display="inline" displaystyle="false" xmlns=" http://www.w3.org/1998/Math/MathML"><mrow><mn>1</mn><mo mathcharacter="43" mathclass="binary" mathgroup="everygroup" mathindex="43">+</mo><mn>12</mn></mrow></math>=</div> ``` Code generated by ConTeXt 2024.08.16: ``` <div> <math data-lmtx-blob="1" data-lmtx-meaning="1 plus 1 equals 2" display="inline" displaystyle="false" xmlns=" http://www.w3.org/1998/Math/MathML "><mrow><mn>1</mn><mo>+</mo><mn>1</mn><mo>=</mo><mn>2</mn></mrow></math></div> ``` Am I doing something wrong here, or is html export for inline equations not currently supported? Best regards, Florent

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