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\setextrafontkerns can cause an infinite loop
by Max Chernoff 30 Jun '22

30 Jun '22

Sometimes using \setextrafontkerns can cause an infinite loop. Example 1: \setextrafontkerns[max] \starttext l\it l \stoptext Example 2: \setupbodyfont[libertinus] \setextrafontkerns[max] \starttext x\ss x \stoptext Both of these examples cause ConTeXt to get stuck until it runs out of memory. This happens in both MkIV and MkXL. This patch seems to fix the issue (although it may break other things...): --- texmf-context/tex/context/base/mkiv/typo-fkr.old 2022-06-30 03:05:17.702804200 -0600 +++ texmf-context/tex/context/base/mkiv/typo-fkr.lua 2022-06-30 03:05:22.286858200 -0600 @@ -57,6 +57,7 @@ end if kern ~= 0 then head, current = insertbefore(head,current,new_kern(kern)) + current = getnext(current) end lastdata = data else @@ -69,6 +70,7 @@ local kern = getkernpair(lastdata,lastchar,char) if kern ~= 0 then head, current = insertbefore(head,current,new_kern(kern)) + current = getnext(current) end end lastchar = char -- Max

2 1

Auto width and height on table cells
by Angel M Alganza 30 Jun '22

30 Jun '22

Hello, I want some tables to occupy 100% of \textwidth and \textheight and for all columns to be the same width except one or two that I want to specify and for all rows to be the same height except for one or two, that I want to specify as well.. For the moment, I'm doing it "manually", calculating column width as (\textwidth - width of fixed columns) / # rest of columns and row height as (\textheight - height of fixed rows) / # rest of rows I'm getting the result that I want, but it's a bit tedious. Is it possible to have ConTeXt do all those calculations for me? I haven't been able to figure it out from the manuals and the wiki. Thank you in advance. Regards, Ángel

4 13

Graded Transparency in MetaFun
by Keith McKay 30 Jun '22

30 Jun '22

Hi all I'm trying to create graded transparency over an area similar to the effect produced using lmt_shade, where one colour goes to another colour over a continuum, but with graded transparency we would go from say 0 to 1 transparency, for a single colour. See the MWE below. I have tried this by creating a loop which draws a linear path, yshifted the thickness of the pen, with transparency calculated for each step over the a predetermined height on the page. I have also tried a similar way for a circular path but in this case the path is repeatedly drawn scaled in a loop. The MWE below works OK but when I zoom into the graded transparency areas lines begin to appear which would suggest that their is a better way to do what I want. This is borne out if you zoom into a lmt-shade area, one colour smoothly becomes another colour. I've put examples of this in the MWE. I'm guessing the way lmt_shade areas are drawn is the way to go. Is this likely to be easy to code for what I want to do? Best Wishes Keith McKay %%%MWE%% \setuppapersize[A4,portrait] \usecolors[crayola] \starttext \startMPpage %page 1 StartPage; numeric maxTransp;% Must be between 0 and 1 numeric opHeight; % Opaque area height on page path t; string p[]; p[5] = "RadicalRed"; p[10] = "LemonYellow"; p[15] = "MiddleGreen"; p[20] = "CadetBlue"; p[25] = "white"; maxTransp := 1; opHeight := 2.5; %cm for k= 5, 10, 15, 20, 25: draw lmt_text [ text = "opaque", color = "black", style = "bold", anchor = "lft", position = (-1mm,2mm), ] xsized .95TextWidth ysized 7cm shifted(22cm,(k - 2)*cm); t := (1cm, k*cm) -- (20cm, k*cm); %Square opaque area draw t withpen pensquare scaled .25pt withcolor p[k] withtransparency("normal",maxTransp); for i = 0 step 0.25until (opHeight*72/2.54): r := (i/(opHeight*72/2.54))*maxTransp; %calculate transparency draw t yshifted (-i-.25)*pt withpen pensquare scaled .25pt withcolor p[k] withtransparency("normal",(maxTransp-r)); draw t yshifted (i+.25)*pt withpen pensquare scaled .25pt withcolor p[k] withtransparency("normal",(maxTransp-r)); endfor; endfor; draw lmt_shade [ path = fullsquare xyscaled(19cm,2cm), direction = "up", alternative = "linear", colors = { "red", "blue" }, ] shifted(10.5cm,1.5cm); StopPage; \stopMPpage \page \startMPpage %page 2 StartPage; numeric maxTransp;% Must be between 0 and 1 numeric opHeight; % Opaque area height path t, u; string p[]; p[5] = "RadicalRed"; p[10] = "LemonYellow"; p[15] = "MiddleGreen"; p[20] = "CadetBlue"; p[25] = "white"; maxTransp := 1; opHeight := 2.5; %centimeters opHeightpt := (opHeight /2.54)*72.27; draw lmt_text [ text = "\rotate{opaque}", color = "black", style = "bold", anchor = "lft", position = (-1mm,2mm), ] xsized .25TextHeight shifted(12cm,10cm); for k= 5, 10, 15, 20, 25: t := (1cm, k*cm)--(20cm, k*cm) ; %Square opaque area draw t withpen pensquare scaled .25pt withcolor p[k] withtransparency("normal",maxTransp); for i = 0 step 0.25 until opHeightpt: r := (i/(opHeight*72.27/2.54))*maxTransp; draw t yshifted (i+0.25)*pt withpen pensquare scaled 0.25pt withcolor p[k] withtransparency("normal",(maxTransp-r)); draw t yshifted (-i-0.25)*pt withpen pensquare scaled .25pt withcolor p[k] withtransparency("normal",(maxTransp-r)); endfor; endfor; draw lmt_shade [ path = fullsquare xyscaled(19cm,2cm), direction = "up", alternative = "linear", colors = { "red", "blue" }, ] shifted(10.5cm,1.5cm) ; StopPage; \stopMPpage \page \startMPpage %page 3 StartPage; draw lmt_text [ text = "opaque", color = "black", style = "bold", anchor = "lft", position = (-1mm,2mm), ] xsized .95TextWidth ysized 7cm shifted(22cm,13cm); draw lmt_text [ text = "opaque", color = "black", style = "bold", anchor = "lft", position = (-1mm,2mm), ] xsized .95TextWidth ysized 7cm shifted(22cm,3cm); path t, u; t := (11cm, 15cm) -- (20cm, 15cm); %Square opaque area u := fullcircle scaled 5cm shifted (5cm,16cm); %Circular opaque area for j = (5*72.27/2.54) step -0.25 until 1: r := (j/(5*72.27/2.54)) *0.5; s := -r + 0.5; draw fullcircle scaled (j*pt) shifted (5cm,16cm) withpen pencircle scaled 0.25pt withcolor ("RadicalRed") withtransparency ("normal",s); endfor; fill fullcircle scaled .25pt shifted (5cm,16cm) withpen pencircle scaled 0.25pt withcolor ("RadicalRed") withtransparency ("normal",s); for i = 0.0001 step 0.25 until (10*72.27/2.54): r := (i/(10*72.27/2.54)); draw t yshifted -i*pt withpen pensquare scaled 0.25pt withcolor ("SpringGreen") withtransparency ("lighten",(1-r)); draw t yshifted i*pt withpen pensquare scaled 0.25pt withcolor ("RadicalRed") withtransparency ("lighten",(1-r)); endfor; draw lmt_shade [ path = fullcircle scaled 5cm, alternative = "circular", colors = { "red", "blue" }, ] shifted(5cm,5cm) withtransparency("normal",0.85); StopPage; \stopMPpage \stoptext

1 0

Multiline text in mathmode
by Johann Birnick 30 Jun '22

30 Jun '22

Hey there, does anybody know how to obtain a similar result as in the attached screenshot? I'm only asking about the multiline text in the big braces, the rest I know. Thank you, Johann

3 5

SVG text alignment issue
by Thangalin 30 Jun '22

30 Jun '22

In the following example, the line and text should be aligned to the middle when LMTX converts the SVG figure using MP. (Note that you may have to install Roboto, but the font isn't the issue.) % SOF \startbuffer[svg] <svg width="25mm" height="70mm" viewBox="0 0 25 70" xmlns="http://www.w3.org/2000/svg" xmlns:svg="http://www.w3.org/2000/svg"> <path d="m 12.500001,63.971412 v -12.4787" id="path2" style="fill:none;fill-opacity:1;stroke:#000000;stroke-opacity:1" /> <text x="-48.831322" y="15.60547" id="text4933-8-6" transform="rotate(-90)" style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:12px;font-family:Roboto;-inkscape-font-specification:'Roboto, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal"><tspan id="tspan159594-1" x="-48.831322" y="15.60547" style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:12px;font-family:Roboto;-inkscape-font-specification:'Roboto, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal">16p13.3</tspan></text> </svg> \stopbuffer \starttext \placefigure[]{}{\includesvgbuffer[svg][conversion=mp]} \stoptext % EOF

3 6

SVG text clipping issue
by Thangalin 29 Jun '22

29 Jun '22

Text that's tight against its viewbox gets clipped: https://i.ibb.co/BGQVzzx/text-clipped.png Here's the code: % SOF \startbuffer[svg] <svg width="41.806641mm" height="25.692665mm" viewBox="0 0 41.806641 25.692665" xmlns="http://www.w3.org/2000/svg" xmlns:svg="http://www.w3.org/2000/svg"> <path d="m 20.90332,25.692664 v -12.4787" style="fill:none;fill-opacity:1;stroke:#000000;stroke-opacity:1" /> <text x="-0.99609375" y="8.6484375" style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:12px;font-family:Roboto;-inkscape-font-specification:'Roboto, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal"><tspan x="-0.99609375" y="8.6484375" style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:12px;font-family:Roboto;-inkscape-font-specification:'Roboto, Normal';font-variant-ligatures:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-east-asian:normal">16p13.3</tspan></text> </svg> \stopbuffer \starttext \placefigure[]{}{\includesvgbuffer[svg][conversion=mp]} \stoptext % EOF

1 0

indent in \setuptyping
by Pablo Rodriguez 29 Jun '22

29 Jun '22

Dear list, I have the following sample: \showframe \setuppapersize[A8] \setuptyping [align={right,broad}, strip=yes, lines=yes, blank=halfline] \starttext \startXML <xml> content content content content </xml> <xml> content content content content </xml> \stopXML \stoptext Which is the option to have the first contents broken and indented automatically by ConTeXt? I have tried all possible options from https://www.pragma-ade.com/general/qrcs/setup-en.pdf#page=266. I had no luck. I remember that this worked (but I couldn’t find the message from Hans where he added the option [years ago...]). Many thanks for your help, Pablo

1 0

not working "mtxrun --scripts cache --erase"
by Pablo Rodriguez 27 Jun '22

27 Jun '22

3 4

[Bug] Two-column text: Larger top spacing in inline images
by Marcin Ciura 27 Jun '22

27 Jun '22

Dear Hans and ConTeXt developers, When you compile the following code with ConTeXt ver: 2021.10.28 10:19, you will see that: * in 1-column text the top spacing of the circle is normal, * in 2-column text, the top spacing of the circle is too large. Here is the link to the output PDF: https://live.contextgarden.net/cgi-bin/result.cgi?id=7K5tLW \def\example{% Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. Lorem ipsum. \startMPcode draw fullcircle scaled 1cm; \stopMPcode\ Lorem ipsum. Lorem ipsum. Lorem ipsum.} \starttext \example \startcolumns \example \stopcolumns \stoptext Best regards, Marcin Ciura

2 1

Re: [NTG-context] Count (and limit) glyphs per line?
by Benjamin Buchmuller 26 Jun '22

26 Jun '22

I completely agree, Hans, that such specifications are often made without a second thought on them. And Max is probably right that they originated from the typewriter area. In a sense these "challenges" can be at least somewhat educational. I've learnt---also thanks to Max's suggestions---a fair amount on LMTX. So, I'm looking forward to see how the "crappyspec" parbuilder will finally look like. Thank you very much for the demo, looks very impressive! Best Benjamin

1 0