August 2024 - ntg-context - NTG Mailing Lists

for loop not working in metapost
by Shiv Shankar Dayal 30 Aug '24

30 Aug '24

Hi, I have plotted a log function and I want to draw an xy axis grid. Below is the code \starttext \startMPcode draw function(1,"x", "log(x)", .1, 10, .01) scaled 1cm; for i = 0 upto 10: draw (i*cm, -5cm) -- (i*cm, 5cm) dashed; endfor; for i = -5 upto 5: draw (0, i*cm) -- (10cm, i*cm) dashed; endfor; \stopMPcode \stoptext My first for loop draws lines but the second gives me an error. Please help. -- Respect, Shiv Shankar Dayal

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BUG REPORT: Italic Correction in ConTeXt LMTX
by contact＠vladimirgrbic.com 30 Aug '24

30 Aug '24

Hello, I started using ConTeXt LMTX 2 days ago and after some initial testing I noticed an unexpected behavior regarding italic correction. In short, I cannot seem to produce italic correction like I could in plain TeX or even LaTeX. I've asked the question on TeX StackExchange and another user confirmed the suspicion in his answer. I would suggest you take a look at it because the formatting of the question and the answer is prettier than in this plain text email. Furthermore, a person who provided the answer already did some research. See the question here: https://tex.stackexchange.com/questions/724568/how-to-invoke-italic-correct… Here is what I observed: Compare the kerning produced in between 'r' and 'p' in the word "airport" when italic correction is applied in plain TeX (compiled with `pdftex`) and in ConTeXt LMTX (compiled with `luametatex`). Here are the minimal working examples. Plain TeX ``` airport (regular font) {\it air\/}port (italic correction applied) {\it air}port (no italic correction applied) \bye ``` ConTeXt LMTX ``` \starttext airport (regular font) {\it air\/}port (italic correction applied) {\it air}port (no italic correction applied) \stoptext ``` Please confirm if this, in fact, is the issue/bug or if I am not approaching this correctly. I am brand new to ConTeXt, so it could be me. Thank you in advance! Vladimir

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Defining mathsymbols from unicode char
by Jethro Djan 29 Aug '24

29 Aug '24

Dear all, 1. I am trying to define the "pitchfork" unicode character( https://unicodeplus.com/U+22D4) to use in ConTeXt as stated on page 387 of new math manual authored by Hans and Mikael: \definemathsymbol[pitchfork][relation]["22D4] It works with some unicode characters and not others (like this character). What can I do to make it work? 2. I would like a \not\perp symbol but it doesn't draw the stroke on top of the symbol. I know you could manipulate this in a plain TeX but I am thinking the mechanism in ConTeXt would be different. How can I achieve this? Also how can I get the \notperp symbol in the accepted answer of https://tex.stackexchange.com/questions/27651/symbol-about-not-orthogonalit… ? Thanks. Jethro

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MetaPost dirtree?
by Henning Hraban Ramm 29 Aug '24

29 Aug '24

Hi, did someone already create directory trees with MetaPost? It should be quite easy, but I couldn’t find examples and was thinking about porting the LaTeX dirtree package (i.e. look at the code and try to implement something similar in Lua and MP). I have ideas… (but I have always too many of them). So far, I used the output of `tree`, and that’s not really beautiful. Hraban

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pdf properties
by Thomas Meyer 29 Aug '24

29 Aug '24

Hi, how can I set the pdf document properties with ConTeXt. For example, so that a document can be printed but not copied, etc. Thanks for any advice Thomas

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Help with Metapopst code
by Shiv Shankar Dayal 28 Aug '24

28 Aug '24

Hi, Consider following code: vardef polygon_with_side(expr n, s) = save a, b, r; numeric a, b, r; a * n = 360; a + 2b = 180; r = s * sind(b) / sind(a); for i = 0 upto n-1: (0, r) rotated (a * i) -- endfor cycle enddef; beginfig(1); path p; p = polygon_with_side(21, 20); draw p; endfig; bye; It draws a polygon with 21 sides with radius 20. I understand all of it except the for loop. What is (0, r) rotated (a *i) doing? -- Respect, Shiv Shankar Dayal

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Is there a way to apply withpattern to text, like fillcolor in lmt_outline[].
by ai2472206007＠yeah.net 28 Aug '24

28 Aug '24

hi , Is there a way to apply withpattern to text, like fillcolor in lmt_outline[]. what I envisaged: https://imgse.com/i/pAAkfjf I've found someone who has asked a similar question, just a combination of the two functions : lmt_outline[] and lmt_shade[] in that question. question from https://mailman.ntg.nl/archives/list/ntg-context@ntg.nl/thread/D5GBGF3RXN75… However, this example didn't work successfully on the Mac, it just showed a background color block. Best Wishes Muyik

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Questions regarding fonts: obliques (fake italics), ligatures and kerning
by Gerion Entrup 28 Aug '24

28 Aug '24

Hi, I played around with different fonts, especially Bitstream XCharter and Overpass (http://overpassfont.org/) and wanted to combine them. However, I see some issues regarding ligatures, kerning and obliques/italics. Here is a minimal example: ``` \definefontfeature[default][mode=node, kern=yes, liga=yes] % more features % [mode=node, kern=yes, liga=yes, tlig=yes, itlg=yes, ccmp=yes, language=dflt, protrusion=quality, expansion=quality] \definefontfamily [myfont][roman][xcharter] \definefontfamily [myfont][sansserif][overpass][rscale=0.93] \definefontfamily [myfont][teletype][overpass][rscale=0.93] \definefontfamily [myfont][mono][overpassmono][rscale=0.93] \definetypeface [myfont][mathematics][math] [xcharter] \setupbodyfont[myfont, 11pt] \startTEXpage \showfontkerns Vitae, Vase, LT, VA, Y., Effizient, abcdel™, \italic{effi abcdel™}, \slanted{effi abcdel™}\\ \style[sans]{Vitae, Vase, LT, VA, Y., Effizient, abcdel™, \italic{effi abcdel™}, \slanted{effi abcdel™}}\\ \style[mono]{Vitae, Vase, LT, VA, Y., Effizient, abcdel™, \italic{effi abcdel™}, \slanted{effi abcdel™}}\\ \showbodyfont[myfont] \stopTEXpage ``` It produces the PDF in the attachment. I'm struggling with several things: - xcharter seems to have no kerning applied. It is listed as font feature, though. Is it correct to have no kerning at all for that font? - xcharter also have no ligatures (at least it doesn't look like that). That is listed as font feature, too, although only for italic and slanted. According to https://tug.org/FontCatalogue/xcharter/ there are ligatures in the font. - Overpass has a glyph for the ae ligature. Is it normal that it is not used as a ligature for ae? - Overpass Mono does not contain italic glyphs. I would have expected obliques when using \slanted then. However, it just remains normal. - I included the ™ in the example since its italic glyph is not slanted. For all fonts \slanted seems to switch to the extra (italic?) glyphs, while I would have expected obliques. At least overpass seems to have no dedicated slanted style, while xcharter has one. - Is there a command to show ligatures the same way there is a command for kerning? I attached the output of the following commands, too: mtxrun --script font --list --file --info --pattern='xcharter*' mtxrun --script font --list --file --info --pattern='overpass*' Thanks Gerion

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About the font used in the document mathincontext-paper.pdf
by Fabrice Couvreur 27 Aug '24

27 Aug '24

Hello, I read this very good document and it says that it was written with the Pagella font. I use this font with a simple \setupbodyfont[pagella,11pt] but I find that the rendering is not the same as on the document, it is less nice especially in the writing of the theorems with the text in italic. Imaginary impression or reality ? Thanks. Fabrice

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documenting namespaces and modules
by Henning Hraban Ramm 27 Aug '24

27 Aug '24

After I got Wolfgang’s slides[1] and code example[2] from the “writing modules” workshop that I requested, I updated several wiki pages: * https://wiki.contextgarden.net/Modules * https://wiki.contextgarden.net/Module_Writing * https://wiki.contextgarden.net/Module_template * https://wiki.contextgarden.net/Module_Namespaces There are probably still errors or outdated relics left. Corrections appreciated. Hraban [1] https://meeting.contextgarden.net/2024/talks/wolfgang/module_howto.pdf [2] https://meeting.contextgarden.net/2024/talks/wolfgang/t-messenger.mkxl

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