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I am toying with luadraw and would like to have my graphic depending on \thepage for the number of iterations. I tried \\thepage, "\\thepage" or to use g:Writeln or tex.sprint but none of them worked.

Minimal non-working example (inspired by the luadraw manual):

%!TEX TS-program = lualatex
\documentclass{article}
\usepackage{luadraw}

\begin{document}
bla blo bli
\begin{luadraw}{name=Sierpinski}
local iteration = g:Writeln("\\thepage") %num? tex.sprint?
local g = graph:new{window={-5,5,-5,5},margin={0,0,0,0},size={1,1}}
local i = cpx.I
local rand = math.random
local A, B, C = 5*i, -5-5*i, 5-5*i -- triangle initial
local T, niv = {{A,B,C}}, iteration
for k = 1, niv do
    T = concat( hom(T,0.5,A), hom(T,0.5,B), hom(T,0.5,C) )
end
for _,cp in ipairs(T) do
    g:Filloptions("full", rgb(rand(),rand(),rand()))
    g:Dpolyline(cp,true, "line width=0pt")
end
g:Show()
\end{luadraw}
\end{document}
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  • 1
    I don't have a better answer than the one offered by @Jasper Habicht, but I have two remarks: your code doesn't work because you're using a method of the g graphic object (g:Writeln()) before you've created that object. Furthermore, the g:Writeln() method writes a string to the tikzpicture environment, but doesn't return a value (so it returns nil). Commented Mar 10 at 12:40

1 Answer 1

Reset to default
3

You can access the value of the counter page (which is called \c@page internally) using tex.count['c@page']:

%!TEX TS-program = lualatex
\documentclass{article}

\begin{document}
This is page \thepage.

This is page \directlua{tex.sprint(tex.count['c@page'])}.
\end{document}

output of above code

So, in your Lua code, you could just say

local iteration = tex.count['c@page']
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  • Any idea how to also access the last page counter? Commented Mar 10 at 12:51
  • 2
    But as always the page counter is not reliable because of the asynchronous page breaking. Commented Mar 10 at 13:35

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