[NTG-context] Clipping multiple PDFs

Pablo Rodriguez oinos at gmx.es
Sun Aug 21 18:41:51 CEST 2022

On 8/18/22 02:13, jethro Reuel via ntg-context wrote:
> Hello,
>
> I am trying to put multiple PDF’s that were typeset differently into
> one document without modifying the individual files themselves.
> [...]
> The problem is the original page numbers show and I’d prefer that it
> did not. So I thought maybe I could clip all the page numbers from
> every page (since they are all in the same position across all the
> pages) but I don’t know how to do this with the \clip command. Any
> ideas? I already tried using \input but it gives some weird output in
> some places. It doesn’t have to use this method as long as it does
> what I need it to do.

Hi Jethro,

it works using \clip with \externalfigure inside a loop (\dorecurse).

With \getfiguredimensions you get the number of pages of each PDF
document (\noffigurepages).

The following source both generates the source PDF document and the
imposed result with clipped pages (just to see a sample of the commands
mentioned above):

\startbuffer[newbuff]
\setuppapersize[A3]
\setupbodyfont[sans, 1200pt]
\starttext
\dorecurse{8}
{\startmakeup[page][pagestate=start, align=center, style=\bf]
\recurselevel
\stopmakeup}
\stoptext
\stopbuffer
\startmode[*first]
\savebuffer[newbuff][source_page.tex, prefix=no]
\executesystemcommand{context --purgeall source_page.tex}
\stopmode
\setuplayout[page]
\setuppapersize[A6][A4]
\setuppaper[nx=2, ny=2]
\setuparranging [XY]
\starttext
\startnotmode[*first]
\def\Doc{source_page.pdf}
\getfiguredimensions[\Doc]
\dorecurse{\noffigurepages}
{\clip[hoffset=96mm, voffset=136mm, width=105mm, height=148mm]
{\externalfigure[\Doc][page=\recurselevel]}}
\stopnotmode
\stoptext

Just in case it might help,

Pablo