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 <qu...@quasi.de>:
> > >
> > > > 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
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