[tex-k] Re: Possible bug in pdfetexk (re \hoffset)?

[Heiko Oberdiek]

On Fri, Jan 27, 2006 at 06:17:16PM +0000, Philip TAYLOR wrote:

> Dear all -- The following preamble produces a correctly
> centered letter using TeX, but PdfTeX appears to offset
> everything by about 1,5 em (see commented-out \advance
> at-end).  A sample document follows.
> 
> Philip Taylor
> --------
> % letter-macros
> 
> \def \from {\leftskip = 0 pt plus 1 fill \parskip = 0 ex \obeylines}
> \def \to {\rightskip = 0 pt plus 1 fill \parskip = 0 ex \obeylines}
> \def \body {}
> \def \blockquote {\vskip \parskip \leftskip = 3 em \rightskip = 0 ex 
> plus 1 fill \parskip = 0 ex \obeylines}
> \def \signature {\vskip 3\parskip}
> 

% pdfTeX also knows \pdfhorigin and \pdfvorigin
% In my teTeX installation the values are set during generating
% the format files in pdftexconfig.tex:
% \pdfhorigin=1 true in
% \pdfvorigin=1 true in
% \showthe\pdfhorigin = 72.26999pt

> \magnification \magstep 1

% Now the values of \pdfhorigin, pdfvorigin need to be
% reassigned, see below

> \parindent = 0 em
> \parskip = 3 ex
> 
> \hsize = 210 true mm
> \vsize = 297 true mm
> 

\input ifpdf.sty
% it sets \ifpdf for detecting pdfTeX in pdf mode

> \begingroup
> \hoffset= 1 true in
> \voffset = 1 true in
> \globaldefs = 1

\ifpdf

\pdfhorigin = 1 true in
\pdfvorigin = 1 true in
% now the value is 60.22462pt (same as \hoffset = 1 true in).

> \pdfpagewidth = \hsize
> \pdfpageheight = \vsize

\fi

> \advance \hsize by -2\hoffset
> \advance \vsize by -2\voffset
> \endgroup

Yours sincerely
  Heiko <oberdiek at uni-freiburg.de>