Getting page width and height in Lua

Getting page width and height in Lua

[Jack Steyn]

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If I want to get the paper width and height to use in some Lua code, I can
use:

local paperwidth, paperheight =
backends.pdf.codeinjections.getpagedimensions()

But what if I want to get the page width and height? That is, the width and
height of the first argument in the two-argument version of
\setuppapersize. Does anyone know how I can obtain these using Lua?

Many thanks,

Jack

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Re: Getting page width and height in Lua

[Wolfgang Schuster]

Jack Steyn schrieb am 30.04.2020 um 16:36:
> If I want to get the paper width and height to use in some Lua code, I 
> can use:
> 
> local paperwidth, paperheight = 
> backends.pdf.codeinjections.getpagedimensions()
> 
> But what if I want to get the page width and height? That is, the width 
> and height of the first argument in the two-argument version of 
> \setuppapersize. Does anyone know how I can obtain these using Lua?

You can use tex.dimen[...] or tex.dimen.<NAME> but all values are in 
scaled points.

\setuppapersize[A5][A4]

\setuplayout[location=middle]

\showframe

\starttext

\startluacode

local pagedimensions = {
     "paperwidth",
     "paperheight",
     "printpaperwidth",
     "printpaperheight",
}

context.starttabulate()
     for _, pagedimension in next, pagedimensions do
         context.NC()
             context.Word(pagedimension)
         context.NC()
 
context((number.tomillimeters(tex.dimen[pagedimension],"%.F%s")))
         context.NC()
         context.NR()
     end
context.stoptabulate()

\stopluacode

\stoptext

Wolfgang
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