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olsak / OpTeX

OpTeX - LuaTeX format with extended Plain TeX macros
http://petr.olsak.net/optex/
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setting horigin to (1in,1in) #182

Open Udi-Fogiel opened 1 month ago

Udi-Fogiel commented 1 month ago

To simplify calculations of \hoffset and \voffset OpTeX set \pdfhorigin and \pdfvorigin to 0pt. LuaTeX, on the other hand, define four new primitives, \pagerightoffset, \pageleftoffset, \pagetopoffset and \pagebottomtoffset, which are being used according to \pagedirection. These registers actually dose not have the annoying 1in by default, but when OpTeX does 

\_pdfvorigin=0pt
\_pdfhorigin=0pt

this 1in is added to them. I suggest instead of shifting \pdf(h/v)origin, just doing 

\_let\_voffset\_pagetopoffset
\_let\_hoffset\_pageleftoffset

for example the following gives the same output

\_pdfhorigin=1in
\_pdfvorigin=1in
\_pagetopoffset\_voffset
\_pageleftoffset\_hoffset
Hello
\bye
Hello
\bye

This way there will be no need for the 1in even in the calculation of `\pagerightofset'.

olsak commented 1 month ago

I see that \pagerightoffset, \pageleftoffset, \pagetopoffset and \pagebottomtoffset are mentioned in LuaTeX manual but they are not documented here. Simply: don't use them. I don't see any reason to add more complications with more primitives. Setting \pdfvorigin=0pt \pdfhorigin=0pt is clear solution of 1in obscurity (of classical TeX) and we don't need more.