Hello ConTeXist and Lua experts.
In a my Lua project I need to determine the changing dimensions of the
TeX \vbox through Lua.
In ConTeXt cycle, it works fine, but in the Lua cycle does not change
the dimensions of the box.
What am I doing wrong?
Thank you.
Jaroslav Hajtmar
Here is my minimal example:
--------------------------------------------------------------------
\newdimen\lsize
\def\contentofvbox{\input ward }
\def\setmybox{\setbox0=\vbox{\hsize=\lsize \contentofvbox}}
\starttext
Height of box via ConTeXt (works fine):
\setmybox
\lsize=5cm
\dorecurse{3}{%
\lsize=\dimexpr(\lsize+7mm)
\setmybox
height of box: \the\ht0\par
width of box: \the\wd0\par
\box0\par
}
\page
... and Height of box via Lua (do not working):
\setmybox
\ctxlua{
tex.dimen.lsize=5*72.27*65536/25.4
for i=1, 3 do
tex.dimen.lsize=tex.dimen.lsize+7*72.27*65536/25.4
context([[\setmybox]])
local heightbox=tex.box[0].height
local widthbox=tex.box[0].width
heightbox=(heightbox*2.84527559067*25.4)/(72.27*65536)
widthbox=(widthbox*2.84527559067*25.4)/(72.27*65536)
context([[height of box:]]..heightbox.."pt\\par")
context([[width of box:]]..widthbox.."pt\\par")
context([[\box0\par]])
end
}
\stoptext
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