Thanks very much to Luigi.
Your solution really works.
Can you please explain why you doing this? My point is that if I have
the LUA code in a separate lua file (loaded with the Contex via
\directlua{dofile("filename.lua")}) (for example as a separate Lua
function), so I'm probably not so to do (how you did it in your example).
Or perhaps in this case there is any way?
Thanks
Jaroslav
Dne 15.6.2012 9:41, luigi scarso napsal(a):
\def\setmybox{\setbox0=\vbox{\hsize=\lsize\input knuth \par}}
\newdimen\lsize
\lsize=5cm
\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 (does it work ?):
\setmybox
\ctxlua{tex.dimen.lsize=5*72.27*65536/25.4;i=0}
\dorecurse{3}{%
\ctxlua{
--[=[ for i=1, 3 do ]=]
i=i+1
tex.dimen.lsize=tex.dimen.lsize+7*72.27*65536/25.4
context([[\setmybox]])
}
\ctxlua{
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(i..[[ height of box:]]..heightbox.."pt :
"..(tex.box[0].height/216).."pt\\par")
context(i..[[ width of box:]]..widthbox.."pt :
"..(tex.box[0].width/216).."pt\\par")
context([[\box0\par]])
--[=[ end ]=]
}
}
\stoptext
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