Re: [***Spam/VIR***] Re: Layer vs. overlay

["Procházka Lukáš Ing. - Pontex s. r. o." <LPr@pontex.cz>]

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Hello,

On Wed, 16 Jan 2013 12:47:21 +0100, Philipp Gesang <philipp.gesang@alumni.uni-heidelberg.de> wrote:

> Lookup the correct string from a table?

thanks for the idea -

- in other words, we have to keep running results somewhere; the algorithm fills a table with texts for each page, and each \setlayer takes one value back, so we can simplify to:

----
\setupbodyfont[30pt]

\starttext
   A

   \definelayer  [beforetext][width=\overlaywidth,height=\overlayheight]
   \defineoverlay[beforetext][{\setups[beforetext]\tightlayer[beforetext]}]

   \startsetups[beforetext]
     \setlayer[beforetext][preset=righttop]
       {\framed[width=2in]{\directlua{context(table.remove(userdata.LPr.texts, 1))}}}
   \stopsetups

   \startluacode
     userdata = userdata or { }
     userdata.LPr = userdata.LPr or { }
     userdata.LPr.texts = {}

     for i = 1, 2 do
       context.startTEXpage { background = "foreground,beforetext" }
         table.insert(userdata.LPr.texts, "BEF" .. i)

         context.externalfigure({"cow"},{width="30cm"})
       context.stopTEXpage()
     end
   \stopluacode

   Z
\stoptext
----

This works.

I'm just thinking whether it would be possible to simplify that all - we're using overlays, layers, setups for overlays and an internal table to keep running results...

BTW: What does \tightlayer[beforetext] exactly do?

Q2: Why some layer properties are specified on \definelayer (beforetext: width=\overlaywidth,height=\overlayheight) and some during overlay setups (beforetext: preset=righttop)?

Lukas


-- 
Ing. Lukáš Procházka [mailto:LPr@pontex.cz]
Pontex s. r. o.      [mailto:pontex@pontex.cz] [http://www.pontex.cz]
Bezová 1658
147 14 Praha 4

Tel: +420 244 062 238
Fax: +420 244 461 038

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\setupbodyfont[30pt]

\starttext
  A

  \definelayer  [beforetext][width=\overlaywidth,height=\overlayheight]
  \defineoverlay[beforetext][{\setups[beforetext]\tightlayer[beforetext]}]

  \startsetups[beforetext]
    \setlayer[beforetext][preset=righttop]
      {\framed[width=2in]{\directlua{context(table.remove(userdata.LPr.texts, 1))}}}
  \stopsetups

  \startluacode
    userdata = userdata or { }
    userdata.LPr = userdata.LPr or { }
    userdata.LPr.texts = {}

    for i = 1, 2 do
      context.startTEXpage { background = "foreground,beforetext" }
        table.insert(userdata.LPr.texts, "BEF" .. i)

        context.externalfigure({"cow"},{width="30cm"})
      context.stopTEXpage()
    end
  \stopluacode

  Z
\stoptext

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