On Fri, Feb 02, 2018 at 04:17:32PM +0100, Henning Hraban Ramm wrote:

Am 2018-02-02 um 12:08 schrieb Rudolf Bahr :

...

On Fri, Feb 02, 2018 at 08:40:08AM +0100, Henning Hraban Ramm wrote:

...

Ahoi,

I’m using a Lua function to calculate image sizes, cropping etc. This snippet:

local filename = figures.current().status.fullname local pic = img.scan{filename = filename}

... works most of the time, but sometimes the "current" image is the previous one, might be because I’m using layers and postponing. So I’d like to use just the same filename as I give to \externalfigure, i.e. without path and extension. How can I address the same file path resolver in my Lua function?

Moin, Hraban,

where could I find something about those lua functions?

Maybe here: http://source.contextgarden.net/tex/context/base/mkiv/grph-inc.lua

The image placement functions I’m using are something Hans and others helped me accomplish during the last meeting; AFAIK there’s no real documentation.

Find attached the lua part. It’s probably more complicated than necessary

I could work around my original problem: I’m using my image with \externalfigure in an invisible place first, so it’s current, and figures.current().status is the right one. :)

Here’s my (convoluted) placement macro:

% image on empty page, caption in margin % usage: % \startpostponing[pagenumber] % \pagefig[reference]{caption}{filename} % \stoppostponing % postponing is important, otherwise the page numbering gets wrong \def\pagefig{\dosingleempty\doPagefig} \def\doPagefig[#1]#2#3{ % calculate image size \startfullpagemakeup \externalfigure[#3][width=1mm] % dummy to set image as current \def\myClipHeight{\ctxlua{ctxClipHeight("#3", \Resolution)}} \def\mystartY{\ctxlua{ctxStartY("#3", \Resolution)}} % image \setlayerframed[bglayer][% frame=off, offset=overlay, x=21mm, y=\mystartY, height=\myClipHeight, width=\textwidth, align=flushleft, ]{% \clip[ width=\textwidth, height=\myClipHeight, hoffset=0mm, voffset=0mm, % i.e. clip bottom! TODO: options! ]{\externalfigure[#3][width=\textwidth]} } \textreference[pre#1]{\myImgHeight} % caption \setlayerframed[bglayer][% frame=off, offset=overlay, linecorrection=on, x=143mm,y=\dimexpr\mystartY + 3pt\relax, height=\myClipHeight, width=\outermarginwidth, align={flushleft,low}, valign=bottom, ]{% \vbox{ \textreference[#1]{\strut #2}\vfill #2 }} \stopfullpagemakeup }

usage example:

\startpostponing[82] \pagefig[alinari-stelzen]{Gebrüder Alinari (Florenz, 19. Jhd.)}{ka34/img/Gebr-Alinari_Kinder_auf_Stelzen} \stoppostponing

Greetlings, Hraban --- http://www.fiee.net http://wiki.contextgarden.net GPG Key ID 1C9B22FD

Moin Hraban! It's very interesting for me to see, how exactly you calculate the size of images and texts with the help of lua! Up to now I used to use python and a independend lua to provide some necessary data for context. For instance python invokes graphicsmagick in order to get the size of images. Because it's provided in px and not in pt, so often some further manual work is unavoidable. Now, since lua and metafun are well integrated into context it suggests itself to use luatex instead of python, though I like this language very much. Thank you very much, Hraban, for putting your macros and links at my disposal! Regards, Rudolf

Am 2018-02-04 um 13:06 schrieb Hans Hagen :

Not sure what you want top know but a lot of image properties can be checked by prerolling: \getfiguredimensions[t:/sources/cow.pdf]

This is really interesting, but my original question was about the file path resolver, i.e. how to get "t:/sources/cow.pdf" from just "cow"? Greetlings, Hraban --- http://www.fiee.net http://wiki.contextgarden.net GPG Key ID 1C9B22FD

Hello Henning,

This is really interesting, but my original question was about the file path resolver, i.e. how to get "t:/sources/cow.pdf" from just "cow"?

I guess there was a similar question here: https://mailman.ntg.nl/pipermail/ntg-context/2017/088324.html Reading till the end, I deduce one has to collect snippets which appear in the code to build its own "file locator" as no function like "MyExternalFigureLocator()" exists in ConTeXt/Lua API. Some highlights: ----

Personally I use the lua variable named : figures.path

It’s a lua table which contains directories names you provide in directory= in \setupexternalfigures:

for _, path in ipairs(figures.paths) do local figure_file = path .. '/' .. file local doc = lpdf.epdf.load(figure_file) -- assume pdf (just an example) if doc then …. end done

Unfortunately, this code supposes the figure name was passed WITH extension, as no lookup in table-of-valid-extensions is performed (maybe no such table nor iterator exists). There should be also: ---- local n = "x:/Users/MMi/Akce/I-6_Krusovice.DSP-ZDS/Admin/Jednani/2017-07-07-SU-Rakovnik/ZJ.pdf" local d = figures.getinfo(n) inspect(d) ---- And a snippet from another mailing thread: ---- (Hans' answer) \getfiguredimensions[test.pdf] \dorecurse {\noffigurepages} { \getfiguredimensions[test.pdf][page=#1] \figurenaturalwidth ,\figurenaturalheight,\figureorientation,\figurerotation\par } in lua you can either use the img library (see luatex manual) or context helpers local data = figures.push("foo.pdf") figures.identify() figures.check() figures.pop() inspect(data) i'll add: function figures.getinfo(name,page) if type(name) == "string" then name = { name = name, page = page } end if name.name then local data = figures.push(name) figures.identify() figures.check() figures.pop() return data end end so that one can do local n = "ms.pdf" local d = figures.getinfo(n) if d then for i=1,d.used.pages do local p = figures.getinfo(n,i) if p then local u = p.used print(u.width,u.height,u.orientation) end end end ---- Hope this helps. Best regards, Lukas On Sun, 04 Feb 2018 19:04:28 +0100, Henning Hraban Ramm wrote:

Greetlings, Hraban --- http://www.fiee.net http://wiki.contextgarden.net GPG Key ID 1C9B22FD

___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki!

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-- Ing. Lukáš Procházka | mailto:LPr@pontex.cz Pontex s. r. o. | mailto:pontex@pontex.cz | http://www.pontex.cz | IDDS:nrpt3sn Bezová 1658 147 14 Praha 4 Mob.: +420 702 033 396

Hello Henning, On Tue, 06 Feb 2018 13:13:12 +0100, Henning Hraban Ramm wrote:

I’ll try as soon as I get some time, since algorithmic image placement is a recurring problem for me, as I try to replace InDesign in my workflow.

I thought about providing a module, but each of my projects has so differing needs that either every macro would need a bunch of options, or I need a lot of similar macros. We’ll see...

my experience in these situations: I'm usually implementing complicated solutions via Lua, with functions with obligatory arg(s) first followed by one optional argument of table type: - it's easy to investigate this optional argument and alter the algorithm depending on table keys (presence and/or value), - you don't have to be afraid of optional arg(s) rearrangement. To be more concrete: ---- Sample Lua code MyPlaceFigure = function(figname, opts) -- Optional; .scale = .sc, .rotation = .rot, .label, ... opts = opts or {} -- To simplify code bellow local scale, rot, lab = opts.scale or opts.sc, -- I.e. more keys are allowed in long/short alternative opts.rotation or opts.rotate or opts.rot, -- dtto opts.label or opts.lab, nil if label then -- E.g. use context.placefloat(...) else context.externalfigure({figname}, {scale = 1000 * scale, orientation = rot, }) end end ---- Best regards, Lukas

Greetlings, Hraban

-- Ing. Lukáš Procházka | mailto:LPr@pontex.cz Pontex s. r. o. | mailto:pontex@pontex.cz | http://www.pontex.cz | IDDS:nrpt3sn Bezová 1658 147 14 Praha 4 Mob.: +420 702 033 396

On Sun, Feb 04, 2018 at 01:06:08PM +0100, Hans Hagen wrote:

On 2/3/2018 7:57 AM, Rudolf Bahr wrote:

...

On Fri, Feb 02, 2018 at 04:17:32PM +0100, Henning Hraban Ramm wrote:

...

Am 2018-02-02 um 12:08 schrieb Rudolf Bahr :

...

On Fri, Feb 02, 2018 at 08:40:08AM +0100, Henning Hraban Ramm wrote:

...

Ahoi,

I’m using a Lua function to calculate image sizes, cropping etc. This snippet:

local filename = figures.current().status.fullname local pic = img.scan{filename = filename}

... works most of the time, but sometimes the "current" image is the previous one, might be because I’m using layers and postponing. So I’d like to use just the same filename as I give to \externalfigure, i.e. without path and extension. How can I address the same file path resolver in my Lua function?

Moin, Hraban,

where could I find something about those lua functions?

Maybe here: http://source.contextgarden.net/tex/context/base/mkiv/grph-inc.lua

The image placement functions I’m using are something Hans and others helped me accomplish during the last meeting; AFAIK there’s no real documentation.

Find attached the lua part. It’s probably more complicated than necessary

I could work around my original problem: I’m using my image with \externalfigure in an invisible place first, so it’s current, and figures.current().status is the right one. :)

Here’s my (convoluted) placement macro:

% image on empty page, caption in margin % usage: % \startpostponing[pagenumber] % \pagefig[reference]{caption}{filename} % \stoppostponing % postponing is important, otherwise the page numbering gets wrong \def\pagefig{\dosingleempty\doPagefig} \def\doPagefig[#1]#2#3{ % calculate image size \startfullpagemakeup \externalfigure[#3][width=1mm] % dummy to set image as current \def\myClipHeight{\ctxlua{ctxClipHeight("#3", \Resolution)}} \def\mystartY{\ctxlua{ctxStartY("#3", \Resolution)}} % image \setlayerframed[bglayer][% frame=off, offset=overlay, x=21mm, y=\mystartY, height=\myClipHeight, width=\textwidth, align=flushleft, ]{% \clip[ width=\textwidth, height=\myClipHeight, hoffset=0mm, voffset=0mm, % i.e. clip bottom! TODO: options! ]{\externalfigure[#3][width=\textwidth]} } \textreference[pre#1]{\myImgHeight} % caption \setlayerframed[bglayer][% frame=off, offset=overlay, linecorrection=on, x=143mm,y=\dimexpr\mystartY + 3pt\relax, height=\myClipHeight, width=\outermarginwidth, align={flushleft,low}, valign=bottom, ]{% \vbox{ \textreference[#1]{\strut #2}\vfill #2 }} \stopfullpagemakeup }

usage example:

\startpostponing[82] \pagefig[alinari-stelzen]{Gebrüder Alinari (Florenz, 19. Jhd.)}{ka34/img/Gebr-Alinari_Kinder_auf_Stelzen} \stoppostponing

Greetlings, Hraban --- http://www.fiee.net http://wiki.contextgarden.net GPG Key ID 1C9B22FD

Moin Hraban!

It's very interesting for me to see, how exactly you calculate the size of images and texts with the help of lua!

Up to now I used to use python and a independend lua to provide some necessary data for context. For instance python invokes graphicsmagick in order to get the size of images. Because it's provided in px and not in pt, so often some further manual work is unavoidable.

Now, since lua and metafun are well integrated into context it suggests itself to use luatex instead of python, though I like this language very much.

Thank you very much, Hraban, for putting your macros and links at my disposal! Not sure what you want top know but a lot of image properties can be checked by prerolling:

\starttext

\getfiguredimensions[t:/sources/cow.pdf]

\starttabulate[|T|T|] \NC \string\figurewidth \NC \figurewidth \NC \NR \NC \string\figureheight \NC \figureheight \NC \NR \NC \string\figurexscale \NC \figurexscale \NC \NR \NC \string\figureyscale \NC \figureyscale \NC \NR \TB \NC \string\figuresize \NC \figuresize \NC \NR \NC \string\figurelabel \NC \figurelabel \NC \NR \NC \string\figurefileoriginal \NC \figurefileoriginal \NC \NR \NC \string\figurefilepage \NC \figurefilepage \NC \NR \NC \string\figurefileoptions \NC \figurefileoptions \NC \NR \NC \string\figurefileconversion\NC \figurefileconversion\NC \NR \NC \string\figurefileresolution\NC \figurefileresolution\NC \NR \NC \string\figurefilecolor \NC \figurefilecolor \NC \NR \NC \string\figurefilearguments \NC \figurefilearguments \NC \NR \NC \string\figurefilecache \NC \figurefilecache \NC \NR \NC \string\figurefileprefix \NC \figurefileprefix \NC \NR \TB \NC \string\figurenaturalwidth \NC \figurenaturalwidth \NC \NR \NC \string\figurenaturalheight \NC \figurenaturalheight \NC \NR \NC \string\figurexresolution \NC \figurexresolution \NC \NR \NC \string\figureyresolution \NC \figureyresolution \NC \NR \NC \string\figureorientation \NC \figureorientation \NC \NR \NC \string\figurerotation \NC \figurerotation \NC \NR \NC \string\figurexsize \NC \figurexsize \NC \NR \NC \string\figureysize \NC \figureysize \NC \NR \NC \string\figurecolordepth \NC \figurecolordepth \NC \NR \NC \string\figuredepth \NC \figuredepth \NC \NR \TB \NC \string\figurefullname \NC \figurefullname \NC \NR \NC \string\noffigurepages \NC \noffigurepages \NC \NR \TB \NC \string\figurefilepath \NC \figurefilepath \NC \NR \NC \string\figurefilename \NC \figurefilename \NC \NR \NC \string\figurefiletype \NC \figurefiletype \NC \NR \stoptabulate

\stoptext

This is very good and useful, thank you, Hans! I need this to set a bunch of family history books with plenty of photos, texts, family trees, journey diaries, scans, index of persons etc. With the help of context+luatex+metafun I'd like to set the pages hopefully without the need of too much manual corrections, i.e in a as far as possible automated way. There is a lot of material, especially nowadays the flood of digital pictures. At the moment I succeed in setting only 2 or 3 such year-books per year. Thanks again for your help, Rudolf

Am 2018-02-04 um 13:06 schrieb Hans Hagen :

\getfiguredimensions[t:/sources/cow.pdf]

\starttabulate[|T|T|] \NC \string\figurewidth \NC \figurewidth \NC \NR \NC \string\figureheight \NC \figureheight \NC \NR \NC \string\figurexscale \NC \figurexscale \NC \NR \NC \string\figureyscale \NC \figureyscale \NC \NR ... \TB \NC \string\figurefullname \NC \figurefullname \NC \NR \NC \string\noffigurepages \NC \noffigurepages \NC \NR \TB \NC \string\figurefilepath \NC \figurefilepath \NC \NR \NC \string\figurefilename \NC \figurefilename \NC \NR \NC \string\figurefiletype \NC \figurefiletype \NC \NR \stoptabulate

Next try: How can I access these values from Lua? While \ctxlua{print("\figureheight")} works, context.figureheight is a function value (?), context.figureheight() or tex.figureheight() is nil, tex.getdimen("figureheight") is also wrong, and it’s also no glue. I’d be thankful for a hint. Greetlings, Hraban --- http://www.fiee.net http://wiki.contextgarden.net GPG Key ID 1C9B22FD