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Building a page based on exact location of graphical elements (PDF)
by Gerben Wierda 17 May '20

17 May '20

What is the simplest way to build a page based on positioning of external images? Some of these images are page-sized (so take up an entire page, though I might want to overlay some other text boxes and MP graphics). I’ve been trying to find a good explanation/introduction into layers (which I think ConTeXtgarden says I should use) but haven’t found one. G

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Arithmetic Overflow error in MetaFun
by Keith McKay 17 May '20

17 May '20

Colleagues I'm having problems with an Arithmetic Overflow error when calculating the x and y values for functions of the form: y = ax^4 + bx^3 + cx^2 + dx + e to which I then add a bit of randomness and other embellishments. I have had a look in the Metafun and Metafont manuals but nothing jumps out at me. In the minimum working example below, this Arithmetic Overflow occurs when xord =13.5 but I can get the calculation to work if I separate out the equation and then add together, since it seems to be failing on the pow(xord,4) instruction. Is there a switch in MetaFont that should be set or a better way of getting round this Arithmetic Overflow error? Thanks Best Wishes Keith McKay %%%%%%%%%%%%%MWE%%%%%%%%%%% \setuppapersize [A4,landscape] \starttext \startMPpage StartPage; width := PaperWidth ; height := PaperHeight ; unit := cm ; path p; p := unitsquare scaled .1cm ; path pat; pat := (0.0*cm,19.935*cm); for xord = 0 step 0.1 until 25: show xord; %%%%%%%%fails at xord = 13.5%%%%%%%%% yord := ((-0.000268117) * pow(xord,4)) +(0.0136949 * pow(xord, 3)) + ((-0.16608) * sqr(xord)) + ((-0.771743) * xord) + 19.935; %%%%%comment out above and uncomment below and it works%%%% % yord1 := (-0.000268117) * sqr(xord); % yord1a := yord1 * sqr(xord); % yord2 := (0.0136949 * pow(xord, 3)); % yord3 := ((-0.16608) * sqr(xord)); % yord4 := ((-0.771743) * xord); % yord := yord1 + yord1a + yord2 + yord3 + yord4 + 19.935; xrand := (uniformdeviate(1) - 0.5)*2; yrand := uniformdeviate(1) - 0.5; xcoord := xord + xrand; ycoord := yord + yrand; if odd xord: pat := pat ... (xcoord*cm, ycoord*cm); else: pat := pat --- (xcoord*cm, ycoord*cm); fill p shifted (xcoord*cm, ycoord*cm) withcolor (uniformdeviate(1),uniformdeviate(1),uniformdeviate(1)) ; fi; draw pat withpen pencircle scaled (uniformdeviate(0.75)*mm) withcolor (uniformdeviate(1),uniformdeviate(1),uniformdeviate(1)); %withtransparency (1, .5); drawdot (xcoord*cm, ycoord*cm) withpen pencircle scaled (uniformdeviate(2.5)*mm) withcolor (uniformdeviate(1),uniformdeviate(1),uniformdeviate(1)); endfor; StopPage; \stopMPpage \stoptext

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Blank page added after pagecolumns
by Joey McCollum 16 May '20

16 May '20

I am typesetting a document using pagecolumns to ensure that my footnotes are set ragged-bottom in columns. I have observed some unexpected behavior whenever the last column on a page is left incomplete: a blank page is added at the end of the document. A minimal working example follows: ``` \starttext \startpagecolumns[n=2] \dorecurse{3}{\par\input zapf} \stoppagecolumns \stoptext ``` I typeset this using ConTeXt version 2020.03.10, as released with TeXLive 2020. Notably, if \dorecurse{3} is changed to \dorecurse{2} or \dorecurse{6} (so that the text ends in the first column of a page), then there is no problem. I have tried to fix this by specifying page=no in the \startpagecolumns arguments, but it did not change anything. Is there something else I am missing? Thank you, Joey

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\goto not working from within \textext()
by Gerben Wierda 16 May '20

16 May '20

This does give me ythe look of a link, but not a working link. Outside of textext() it works. Is there a way to get a working link in a MetaFun picture? Thx, G \setupinteraction [state=start, color=blue, style=bold] \starttext \goto{works}[url(https://ea.rna.nl/2011/06/05/on-the-use-of-colours-in-archimate/)] \setupMPpage [background=color, backgroundcolor=gray] \startMPpage[instance=doublefun] draw textext("\goto{doesn’t work}[url(https://ea.rna.nl/2011/06/05/on-the-use-of-colours-in-archimate/)]"); \stopMPpage \stoptext

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--nodates not working
by Pablo Rodriguez 15 May '20

15 May '20

Dear list, the “LuaMeTaTeX Reference Manual” describes that the command line argument "--nodates" removes time dependent information in the output file. I’m afraid it doesn’t work. "\enabledirectives[backend.date=no]" doesn’t work either. This is really useful to be able to generate the exact PDF output (from a hashing point of view). Am I missing something or have I hit a bug? Many thanks for your help, Pablo -- http://www.ousia.tk

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page number with brief centered line above
by jbf 14 May '20

14 May '20

Hi list, I am trying to achieve a layout where there is a brief line above the bottom-centered page number (of a double-sided document). I am able to achieve the centered bottom-located page number easily and obviously enough with: \setuppagenumbering [alternative=doublesided,location={footer,middle}] \setupfooter [style=bold] And I was able to achieve a result with a short line above where the page number should be - but by adopting the solution below I have now lost the page number. \setuppagenumbering [alternative=doublesided,location={footer,middle}] \setupfootertexts[{\framed[frame=off,topframe=on,width=.5\textwidth]}] So then I thought that having left out any reference to page numbers I had better put it in, so I added [pagenumber] to the above, but I ended up with two page numbers, one centered, the other to the inner or outer margins (depending on recto/verso), and the line was likewise to the right or left of the centred number. So clearly not what I want. Maybe the solution lies with some combination of the above I haven't thought of, or maybe there is another solution altogether. Any thoughts? Julian

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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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