May 2020 - ntg-context - NTG Mailing Lists

Using transparency in METAPOST within textext()
by Gerben Wierda 14 May '20

14 May '20

Is it possible to get a transparent background in a textext()? The following minimal example doesn’t work. \starttext \setupMPpage [background=color, backgroundcolor=gray] \startMPpage draw textext("\definecolor[labelbackground][a=0.2,r=1,g=1,b=1]\framed[height=1.2em,background=color,backgroundcolor=labelbackground,foregroundcolor=black]{Text in Label}"); \stopMPpage \stoptext Thx. G

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left protruding quotations
by Michael Guravage 14 May '20

14 May '20

When I start a paragraph with a \quote or a \quotation the left quotemark does not protrude, but when I use Unicode quotes it does. I would prefer to use the commands. Any suggestions on how I can achieve proper left protrusion without resorting to Unicode characters? Cheers, Michael

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Retrieving original value of enviroment variable HOME
by context＠vivaldi.net 14 May '20

14 May '20

Hello, before I run ConTeXt, I set a (new) variable "HOME" to point to a particular directory. ConTeXt changes its value during startup - it sets its value to %USERPROFILE% - I guess it is to unify environment somehow for all platforms ConTeXt supports; probably here: ---- data-ini.lua, ln. ~86 do local homedir = osgetenv(ostype == "windows" and 'USERPROFILE' or 'HOME') or '' if not homedir or homedir == "" then homedir = char(127) -- we need a value, later we wil trigger on it end homedir = file.collapsepath(homedir) ossetenv("HOME", homedir) -- can be used in unix cnf files <<<<<<<<<<<<<< HERE ossetenv("USERPROFILE",homedir) -- can be used in windows cnf files environment.homedir = homedir end ---- But anyway - would it be possible to store the original value of HOME environment variable (if set) before it gets changed during initialization - e.g. to a Lua table? - I would need to work with the original value in run-time (Win7 / WinX; ConTeXt MkIV). Best regards, Lukas

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Is it possible to make xml.load a bit more 'verbose' when it encounters errors?
by Gerben Wierda 14 May '20

14 May '20

I am loading an xml.file. I sometimes make mistakes editing that file and then xml.load creates a string that contains <error>invalid xml file - parsed text</error> At that point I check my file and sometimes (like now) I cannot find the error. Is there a way to make xml.load somewhat more verbose about where it encounters the error? G

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complete cover example
by jbf 12 May '20

12 May '20

Am wondering if anybody has a complete example (explained below) of a book cover: front, spine and back. It doesn't matter how simple or complicated the example. Am one of those people who, once he sees an example, can generally work out the necessary adaptations. By a complete example I mean the kind of thing found here Creating a style file in ConTeXt | Random Determinism <https://randomdeterminism.wordpress.com/2009/10/21/creating-a-style-file-in…> where the writer explains things bit by bit but importantly, offers a summary of the code at the end. I probably don't need the lengthy explanation but the summary of code is most helpful - except that it is not about a book cover:-) As a relative newcomer to ConTeXt, I have found complete examples of something I want/need to do very useful. Of course, many such are on the wiki, but from time to time I need something else, and right at the moment I need a bit of guidance for a book cover, and an example might help. Julian

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new lmtx upload
by Hans Hagen 12 May '20

12 May '20

Hi, The tex engine has at most 65K dimen and count registers and these can be local and global (although mixing these two models for the same variable can be inefficient). Anyway, in the current upload there is a mechanism for using way more variables, global ones, that are managed by lua: \luadimen test 100pt \scratchdimen = .25 \luadimen test \the\scratchdimen \the\luadimen test So, they act as normal dimensions and counters wrt assignment and serialization and such. There are also floats and booleans (in addition to integers and cardinals). Then, as another experiment, there are one/two dimensional arrays of variables. Think of: \newarray name whatever type integer nx 100 ny 500 \arrayvalue whatever 20 30 1024 \the\arrayvalue whatever 10 30 \the\arrayvalue whatever 20 30 \the\arrayvalue whatever 30 30 Some more info can be found in the last chapoter of the evenmore.pdf document. The question is: do we need this, and if so, do we need more of that. It's a bit chicken-egg case: we can have lua and can pipe back to tex, and we can stay at the tex end. This is a lmtx only feature. Just for the record: these are macros, not primitives, but they are rather efficient and have hardly any overhead. The floats can be in 1.23 format, 1.23e45 format and also in 0x12p34 format, while integers can be in 123 format and 0x123 format; the hex float format is lua's way of being roundtrip. Hopefully there are no side effects. 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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ConTeXt doesn't recognize source on network drive?
by context＠vivaldi.net 12 May '20

12 May '20

Hello, after I've updated ConTeXt to the latest version, a new problem appeared - see the steps: (Note that "X:" is a network drive mapped as "\\192.168.112.xxx\px" - if it was of importance.) ---- X:\Users\MMi\Akce\Stechovice-I-etapa.RDS\Projekt.RDS\P.Prac\SO_251\TZ>set path=d:\Ctx-Beta\tex\texmf-mswin\bin;%PATH% X:\Users\MMi\Akce\Stechovice-I-etapa.RDS\Projekt.RDS\P.Prac\SO_251\TZ>findfile context.exe d:\Ctx-Beta\tex\texmf-mswin\bin\context.exe X:\Users\MMi\Akce\Stechovice-I-etapa.RDS\Projekt.RDS\P.Prac\SO_251\TZ>context.exe x:\Users\MMi\Akce\Stechovice-I-etapa.RDS\Projekt.RDS\P.Prac\SO_251\TZ\14-001-TZ.mkiv resolvers | formats | executing runner 'run luatex format': d:/Ctx-Beta/tex/texmf-mswin/bin/luatex --jobname="14-001-TZ" --fmt=d:/Ctx-Beta/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/format -c:texmfbinpath="d:/Ctx-Beta/tex/texmf-mswin/bin" This is LuaTeX, Version 1.13.0 (TeX Live 2020/W32TeX) system commands enabled. open source > level 1, order 1, name 'd:/Ctx-Beta/tex/texmf-context/tex/context/base/mkiv/cont-yes.mkiv' system > system > ConTeXt ver: 2020.05.08 20:46 MKIV beta fmt: 2020.5.11 int: english/english system > system > 'cont-new.mkiv' loaded open source > level 2, order 2, name 'd:/Ctx-Beta/tex/texmf-context/tex/context/base/mkiv/cont-new.mkiv' system > beware: some patches loaded from cont-new.mkiv close source > level 2, order 2, name 'd:/Ctx-Beta/tex/texmf-context/tex/context/base/mkiv/cont-new.mkiv' system > files > jobname '14-001-TZ', input 'x:\\Users\\MMi\\Akce\\Stechovice-I-etapa.RDS\\Projekt.RDS\\P.Prac\\SO_251\\TZ\\14-001-TZ.mkiv', result '14-001-TZ' fonts > latin modern fonts are not preloaded languages > language 'en' is active tex error > tex error on line 8 in file d:/Ctx-Beta/tex/texmf-context/tex/context/base/mkiv/cont-yes.mkiv: ! I can't find file `x://Users/MMi/Akce/Stechovice-I-etapa.RDS/Projekt.RDS/P.Prac/SO_251/TZ/14-001-TZ.mkiv'. l.8 } l.97 \getvalue{clf_processjob} % from cont-run.lua 1 %D \module 2 %D [ file=cont-yes, 3 %D version=2012.06.01, 4 %D title=\CONTEXT\ Miscellaneous Macros, 5 %D subtitle=Startup Stub, 6 %D author=Hans Hagen, 7 %D date=\currentdate, 8 >> %D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}] 9 %C 10 %C This module is part of the \CONTEXT\ macro||package and is 11 %C therefore copyrighted by \PRAGMA. See mreadme.pdf for 12 %C details. 13 14 % At some point I will reconsider the \starttext .. \stoptext 15 % wraping as we can assume proper styling. It's a left-over from 16 % mkii that we need to get rid of. 17 18 % now moved to cont-run.lua mtx-context | fatal error: return code: 1 ---- So: 1. "ConTeXt ver: 2020.05.08 20:46 MKIV beta fmt: 2020.5.11" should be the newest, OK. 2. The new probles seems to be: "I can't find file `x://Users... ^^---------- Why this replacement of "\"? Best regards, Lukas

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\goto works but links don't when passed via textext() in METAPOST
by Gerben Wierda 10 May '20

10 May '20

I am trying to get an URL link in a textext() via METAPOST. I’ve got this before \starttext (or after, tried both): \setupinteraction [state=start, color=blue, style=bold] The intended link shows up in blue and bold, but it is not clickable. I’ve turned ConTeXt tracing on and see this when the text is passed to METAPOST: cld > tex > f : 8 : picture pic; x:=1233.000; y:=913.000; w:=180.000; h:=407.000;pic := Label( w, h, (1.000,1.000,0.784), 1.0, 1.000, (0.000,0.000,0.000), 1.000, "dashed evenly", 1.000, (0.000,0.000,0.000), 1.000, "", "\definebodyfont[11pt][rm][default=Regular at 11pt]\switchtobodyfont[11pt]\setupinterlinespace[12.1pt]\framed[align=flushleft,frame=off,offset=none,width=170.000bp]{\colored[r=0.000, g=0.000, b=0.000]{\tf The elements are shown in colors where blue represents active structure, yellow behaviour, and green passive structure. See \goto{here}[url(https://ea.rna.nl/2011/06/05/on-the-use-of-colours-in-archimate/)].\crlf{}\crlf{} {\bf Color codes:}\crlf{}\crlf{} - \colored[mared]{\bf Red}{} and \colored[maviolet]{\bf Violet}{} stand for a 'higher' layer element used as an abstract representation of a lower layer element. When the target is the Business Layer, it implies automated business behavior (marked violet).\crlf{}\crlf{} - \colored[maorange]{\bf Orange}{} and \colored[mablue]{\bf Blue}{} are used to model 'downward' serving, e.g. Business Layer serving the Technology Layer.\crlf{}\crlf{} - \colored[magreen]{\bf Green}{} stands for class relations inside the metamodel. Important conseqence: relations of a parent (in the meta-model) Specialization are valid for {\it all} children (in the meta-model). This does not happen when Specialization is used in an actual model. There are in fact two fully different specializations in ArchiMate (see the book, including the free excerpt, for a full explanation)\\}}", "up", "center", "center") shifted (x, -y);draw pic;path AllPathIds_idCDCEH; AllPathIds_idCDCEH := pathpart pic; pair AllNodeCenters_idCDCEH; AllNodeCenters_idCDCEH := center pic; The red is what is being typeset, the \goto is part of that. And later this when METAPOST passes it on to TeX via textext(): cld > tex > f : 8 : \definebodyfont [11pt][rm][default=Regular at 11pt]\switchtobodyfont [11pt]\setupinterlinespace [12.1pt]\framed [align=flushleft,frame=off,offset=none,width=170.000bp]{\colored [r=0.000, g=0.000, b=0.000]{\tf The elements are shown in colors where blue represents active structure, yellow behaviour, and green passive structure. See \goto {here}[url(https://ea.rna.nl/2011/06/05/on-the-use-of-colours-in-archimate/)].\crlf {}\crlf {} {\bf Color codes:}\crlf {}\crlf {} - \colored [mared]{\bf Red}{} and \colored [maviolet]{\bf Violet}{} stand for a 'higher' layer element used as an abstract representation of a lower layer element. When the target is the Business Layer, it implies automated business behavior (marked violet).\crlf {}\crlf {} - \colored [maorange]{\bf Orange}{} and \colored [mablue]{\bf Blue}{} are used to model 'downward' serving, e.g. Business Layer serving the Technology Layer.\crlf {}\crlf {} - \colored [magreen]{\bf Green}{} stands for class relations inside the metamodel. Important conseqence: relations of a parent (in the meta-model) Specialization are valid for {\it all} children (in the meta-model). This does not happen when Specialization is used in an actual model. There are in fact two fully different specializations in ArchiMate (see the book, including the free excerpt, for a full explanation)\\}} Still correct. But the end result doesn’t have a working hyperlink. Outside the route to METAPOST, the \goto statement does produce a working link. Should this work when passed via textext()? G

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Would it be possible in LMTX to do something like variable font/lineheight to fit a fixed frame?
by Gerben Wierda 10 May '20

10 May '20

Suppose I have a fixed sized frame, say 3 y 4 cm. And I have a variable-length text. Would it be possible to write a macro that scaled the font and line height such that the text will fit in the frame? What I have now is very basic: Fixed width Typeset (METAPOST textext()) If too high METAPOST: scale down so it fits in frame But the scaling wil scale both height and width so it doesn’t only go to the correct height, it also gets too narrow. Just scaling in the vertical direction squashes the text/font. What would be great is some way to have the font size and lineheight result from TeX trying to fit it inside a predetermined size. Doesn’t need to be perfect, a good approximation will do. I’ve been thinking about using the surface size difference between desired box size and the result of textext() as an approach to guess a right fontsize and line height. What could make it possible for me too is a way to do a typeset command from lua that gives me the box sizes of typesetting without actually typesetting it to the true output of the job. Something like typeset a piece of text without actually outputting it to the PDF output in a width (say 4) get the width and height of the result (say 4 x 6) Adapt front size and lineheight (from 4x6 to 4x3 means a 50% reduction, which may be too much as the result may have just a syllable on the last line) typeset for real in 50% size Is that doable? Or is there a better way? G

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METAPOST subpath rounding issue
by Gerben Wierda 10 May '20

10 May '20

I have a METAPOST algorithm that splits a path at a certain time in two, does something with both ends (not the ends where they were split) and then rejoins them. In very rare cases this crashes, because the subpath doesn’t work as expected. firstPart := subpath (0,halfWayTime) of workingConn; secondPart := subpath (halfWayTime,pathTimeLen) of workingConn; may sometimes result in something like this: metapost log > >> Path at line 0: metapost log > (273,-427)..controls (259.50666666666666,-427) and (246.01333333333335,-427) metapost log > ..(232.52000000000001,-427) metapost log > metapost log > >> Path at line 0: metapost log > (232.51999999999998,-427)..controls (161.68000000000001,-427) and (90.840000000 metapost log > 000003,-427) metapost log > ..(20,-427) As can be seen in these (rare) cases the two calls to subpath result in a different point resulting from both. so, when I later try to rejoin them with & it fails: metapost log > ! Paths don't touch; '&' will be changed to '..'. metapost log > <to be read again> Which means subpath doesn’t always exactly do what I expect it to do (and many explanations, but not the official manual) state. Again, this is rare. I’ve done this to work around it but I wondered if there was a better (reliable) solution save cutFirstPart; path cutFirstPart; cutFirstPart := firstPart maxcutbefore fromPicOutline; save cutSecondPart; path cutSecondPart; cutSecondPart := secondPart maxcutafter toPicOutline; if ((xpart point 0 of cutSecondPart) <> (xpart point infinity of cutFirstPart)) or ((ypart point 0 of cutSecondPart) <> (ypart point infinity of cutFirstPart)): resultConn := cutFirstPart--cutSecondPart; else: resultConn := cutFirstPart & cutSecondPart; fi G

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