Re: [NTG-context] Pdf info with Lua/Ctx API

15 Aug 2017

      Hello Hans,

that's exactly what I've been looking for!

(And yes, I've asked one or more times, with a solution that seemed to me a bit "forced" or "non-clear", so the latest solution looks perfectly!)

Best regards,

Lukas

On Mon, 14 Aug 2017 16:55:09 +0200, Hans Hagen  wrote:
...
On 8/14/2017 1:08 PM, Procházka Lukáš Ing. wrote:
...
Hello,
is there a way how to get the following info from a PDF file via Lua/Ctx
API?:
- first: number of pages of the PDF,
- next: for each page: get width, height and orientation
(portrait/landscape) or rotation (+90,+ 180, +270 or so) of i-th page.
this probably has come up several times now, anyway
\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
etc etc
-- 
Ing. Lukáš Procházka | mailto:LPr@pontex.cz
Pontex s. r. o.      | mailto:pontex@pontex.cz | http://www.pontex.cz | IDDS:nrpt3sn
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