[NTG-context] Size of the last shipped page by Lua?

Hans Hagen pragma at wxs.nl
Fri Sep 23 15:00:39 CEST 2016


On 9/23/2016 1:50 PM, Procházka Lukáš Ing. wrote:
> Hello,
>
> still a problem - consider the following code:
>
> ----
> \ifx\startpapersize\undefined
>   \unprotect
>     \def\startpapersize{\page\pushmacro\page_paper_restore\setuppapersize}
>   \protect
> \fi
>
> \ifx\stoppapersize\undefined
>   \unprotect
>     \def\stoppapersize{\page\popmacro\page_paper_restore\setuppapersize}
>   \protect
> \fi
>
> %
>
> \startluacode
>   local tomm = function(v) return v * (210 / 39158276) end
>
>   pgsz = function()
>     context("w=%.1f, h=%.1f", tomm(tex.dimen.paperwidth),
> tomm(tex.dimen.paperheight))
>   end
> \stopluacode
>
> %
>
> \starttext
>   A
>   \ctxlua{pgsz()}
>
>   \startpapersize[A3,landscape]
>     B
>     \ctxlua{pgsz()}
>   \stoppapersize
>
>   \startTEXpage[width=200mm,height=100mm]
>     C % 3rd page
>     \ctxlua{pgsz()}
>   \stopTEXpage

the papersize of a TEXpage is known when that page is flushed and when 
you ask for it the way you do now tex is still constructing the box

it's all a matter of timing

\starttext

\appendtoks
     \ctxlua{
         print(
             number.topoints(tex.dimen.paperwidth ),
             number.topoints(tex.dimen.paperheight)
         )
     }%
\to \everyshipout

\setuppapersize[A4] test

\startTEXpage test \stopTEXpage

\setuppapersize[A3] test

\stoptext


> \stoptext
> ----
>
> In the case of 3rd page (with text "C"), page size "w=210.0, h=297.0" is
> printed instead of "w=200.0, h=100.0".
>
> So how to access values 200 and 100 mm for the page produced by
> \startTEXpage[width=...,height=...]?
>
> Best regards,
>
> Lukas
>
>
> On Thu, 08 Sep 2016 22:12:49 +0200, Hans Hagen <pragma at wxs.nl> wrote:
>
>> On 9/8/2016 9:47 PM, josephcanedo at gmail.com wrote:
>>> If by messing it’s meant modifying their values, I agree that’s a bad
>>> idea 😊, the requirement is likely to read the value only (at least this
>>> is my usage of these in shipouts « after » callback).
>>>
>>> If these are not reliable, what’s the reliable way to get the page width
>>> and height ?
>>
>> \starttext
>>
>> \ctxlua{context(number.topoints(tex.dimen.paperwidth))}
>>
>> \ctxlua{context(number.topoints(tex.dimen.paperheight))}
>>
>> \stoptext
>>
>>
>> -----------------------------------------------------------------
>>                                            Hans Hagen | PRAGMA ADE
>>                Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>>         tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
>> -----------------------------------------------------------------
>> ___________________________________________________________________________________
>>
>> If your question is of interest to others as well, please add an entry
>> to the Wiki!
>>
>> maillist : ntg-context at ntg.nl /
>> http://www.ntg.nl/mailman/listinfo/ntg-context
>> webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
>> archive  : http://foundry.supelec.fr/projects/contextrev/
>> wiki     : http://contextgarden.net
>> ___________________________________________________________________________________
>>
>
>
>
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
>
> maillist : ntg-context at ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
> archive  : http://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________
>


-- 

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------


More information about the ntg-context mailing list