Re: [NTG-context] Using luacode

19 Jan 2015

      On 1/19/2015 8:58 PM, Eric Gerard wrote:
...
Dear list members
I think I don’t really understand the way to use a context command with luacode !
What I attempt to do is to write a function in lua which computes the position of one or several bottom tabs depending on : line number (1 is the lowest, 2 is above etc), number of tabs, horizontal position of the tab on the line.
The height of the tab is a Tex value \hauteuronglet
So I compute the x and y value and the width of the tab(s)
After that I want to define a layer with the tab(s) in a table
I can’t have the context.setlayer working properly.
For sure, this code should be cleaned after testing.
Here is the code I wrote
\definelayer[OngletBas][x=0mm, y=0mm, width=\paperwidth, height=\paperheight]
% variables
\newdimen\hauteuronglet
\hauteuronglet=1cm
%variables onglet gauche
\newdimen\vertposonglet
\newdimen\hauteurzoneacouper
%variables onglet bas
\newdimen\largeurzoneongletsbas
\newdimen\ordonneeongletsbas
\newdimen\abscisseongletsbas
\newdimen\largeurongletbas
\startluacode
  function test(opt_1, arg_1)
      local table = lpeg.split(",",interfaces.tolist(opt_1))
      local labels = lpeg.split(",",arg_1)
local NumLigne = table[1]
      local NbTotalOnglets = table[2]
      local PremierOnglet = table[3]
      local decalage = tex.sp("6.5pt")
tex.dimen.ordonneeongletsbas = tex.dimen.paperheight - tex.dimen.hauteuronglet * NumLigne
      tex.dimen.largeurzoneongletsbas = tex.dimen.paperwidth - tex.dimen.backspace
      tex.dimen.largeurongletbas = tex.dimen.largeurzoneongletsbas / NbTotalOnglets
      tex.dimen.abscisseongletsbas = tex.dimen.backspace + tex.dimen.largeurongletbas * (PremierOnglet - 1)
local x_ongletsbas = tex.dimen.abscisseongletsbas - decalage
      local y_ongletsbas = tex.dimen.ordonneeongletsbas
      local largeurongletbas = tex.dimen.largeurongletbas
context.setupbackgrounds({"page"},{background = "OngletBas"})
context.setlayer({"OngletBas"},{hoffset = x_ongletsbas, voffset = y_ongletsbas},
      context.setupTABLE({c},{1,2,3,4,5,6},{width = largeurongletbas})
      context.bTABLE()
      	context.bTR()
      		context.bTD()
      			context(labels[1])
      		context.eTD()
      	context.eTR()
      context.eTABLE()
      )
      end
  interfaces.definecommand {
      name = "test",
      arguments = {
      { "option", "hash" },
      { "content", "string" },
      },
      macro = test,
      }
\stopluacode
I have to add also (I don’t understand why) but I need to add an offset of -6.5pt to adjust the position of the table.
you need to make a complete example, something that runs without me 
having to define extra tex code

btw, don't overload the 'table' table ... you can't access the helpers 
in its namespace otherwise,

Hans

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