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%% This is part of OpTeX project, see http://petr.olsak.net/optex
\_codedecl \margins {Macros for margins setting <2019-05-21>}
\_newdimen\_pgwidth \_newdimen\_pgheight \_pgwidth=0pt
\_newdimen\_shiftoffset
\_def\_margins/#1 #2 (#3,#4,#5,#6)#7 {\_def\_tmp{#7}%
\_ifx\_tmp\_empty
\_opwarning{\_string\_margins: missing unit, mm inserted}\_def\_tmp{mm}\_fi
\_setpagedimens #2 % setting \_pgwidth, \_pgheight
\_ifdim\_pgwidth=0pt \_else
\_hoffset=0pt \_voffset=0pt
\_if$#3$\_if$#4$\_hoffset =\_dimexpr (\_pgwidth -\_hsize)/2 \_relax
\_else \_hoffset =\_dimexpr \_pgwidth -\_hsize - #4\_tmp \_relax % only right margin
\_fi
\_else \_if$#4$\_hoffset = #3\_tmp \_relax % only left margin
\_else \_hsize =\_dimexpr \_pgwidth - #3\_tmp - #4\_tmp \_relax % left+right margin
\_hoffset = #3\_tmp \_relax
\_fi\_fi
\_if$#5$\_if$#6$\_voffset =\_dimexpr (\_pgheight -\_vsize)/2 \_relax
\_else \_voffset =\_dimexpr \_pgheight -\_vsize - #6\_tmp \_relax % only bottom margin
\_fi
\_else \_if$#6$\_voffset = #5\_tmp \_relax % only top margin
\_else \_vsize=\_dimexpr \_pgheight - #5\_tmp - #6\_tmp \_relax % top+bottom margin
\_voffset = #5\_tmp \_relax
\_fi\_fi
\_if 1#1\_shiftoffset=0pt \_def\_prepoffsets{}\_else \_if 2#1% double-page layout
\_shiftoffset = \_dimexpr \_pgwidth -\_hsize -2\_hoffset \_relax
\_def\_prepoffsets{\_ifodd\_pageno \_else \_advance\_hoffset \_shiftoffset \_fi}%
\_else \_opwarning{use \_string\_margins/1 or \_string\_margins/2}%
\_fi\_fi\_fi
}
\_def\_setpagedimens{\_isnextchar({\_setpagedimensB}{\_setpagedimensA}}
\_def\_setpagedimensA#1 {\_ifcsname _pgs:#1\_endcsname
\_ea\_ea\_ea\_setpagedimensB \_csname _pgs:#1\_ea\_endcsname\_space
\_else \_opwarning{page specification "#1" is undefined}\_fi}
\_def\_setpagedimensB (#1,#2)#3 {\_setpagedimensC\_pgwidth=#1:#3
\_setpagedimensC\_pgheight=#2:#3
\_pdfpagewidth=\_pgwidth \_pdfpageheight=\_pgheight
}
\_def\_setpagedimensC #1=#2:#3 {#1=#2\_ifx^#3^\_tmp\_else#3\_fi\_relax\_truedimen#1}
\_sdef{_pgs:a3}{(297,420)mm} \_sdef{_pgs:a4}{(210,297)mm} \_sdef{_pgs:a5}{(148,210)mm}
\_sdef{_pgs:a3l}{(420,297)mm} \_sdef{_pgs:a4l}{(297,210)mm} \_sdef{_pgs:a5l}{(210,148)mm}
\_sdef{_pgs:b5}{(176,250)mm} \_sdef{_pgs:letter}{(8.5,11)in}
\_def\_trueunit{}
\_def\_magscale[#1]{\_mag=#1\_def\_trueunit{true}%
\_ifdim\_pgwidth=0pt \_else \_truedimen\_pgwidth \_truedimen\_pgheight \_fi
\_truedimen\_pdfpagewidth \_truedimen\_pdfpageheight
}
\_def\_truedimen#1{\_ifx\_trueunit\_empty \_else#1=\_ea\_ignorept\_the#1truept \_fi}
\_public
\margins \magscale ;
\_endcode % -----------------------------------------
\sec Setting the margins
%%%%%%%%%%%%%%%%%%%%%%%%
OPmac declares paper formats a4, a4l (landscape~a4), a5, a5l, b5, letter and
user can declare another own format by "\sdef":
\begtt
\sdef{pgs:b5l}{(250,176)mm}
\sdef{pgs:letterl}{(11,8.5)in}
\endtt
The "\margins" command declares margins of the document. This command have
the following parameters:
\begtt
\margins/<pg> <fmt> (<left>,<right>,<top>,<bot>)<unit>
example:
\margins/1 a4 (2.5,2.5,2,2)cm
\endtt
Parameters are:
\begitems
* <pg> \dots\ "1" or "2" specifies one-page or two-pages design.
* <fmt> \dots\ paper format (a4, a4l, a5, letter, etc. or user defined).
* <left>, <right>, <top>, <bot> \dots\ gives the amount of left, right,
top and bottom margins.
* <unit> \dots\ unit used for values <left>, <right>, <top>, <bot>.
\enditems
Each of the parameters <left>, <right>, <top>, <bot> can be empty.
If both <left> and <right> are nonempty then "\hsize" is set. Else "\hsize"
is unchanged. If both <left> and <right> are empty then typesetting area is
centered in the paper format. The analogical rule works when <top> or <bot>
parameter is empty ("\vsize" instead "\hsize" is used). Examples:
\begtt
\margins/1 a4 (,,,)mm % \hsize, \vsize untouched,
% typesetting area centered
\margins/1 a4 (,2,,)cm % right margin set to 2cm
% \hsize, \vsize untouched, vertically centered
\endtt
If "<pg>=1" then all pages have the same margins. If "<pg>=2" then the
declared margins are true for odd pages. The margins at the even pages are
mirrored in such case, it means that <left> is replaced by <right> and vice
versa.
The "<fmt>" can be in the form "(<width>,<height>)<unit>" where "<unit>" is
optional. If it is missing then "<unit>" after margins specification is
used. For example:
\begtt
\margins/1 (100,200) (7,7,7,7)mm
\endtt
%
declares the paper 100$\times$200\,mm with all four margins 7\,mm. The spaces
before and after "<fmt>" parameter are necessery.
The command "\magscale[<factor>]" scales the whole typesetting area. The
fixed point of such scaling is the so called the ``Knuth's point'': 1in
below and 1in right of paper sides. Typesetting (breakpoints etc.) is
unchanged. All units are relative after such scaling. Only paper formats
dimensions stays unscaled. Example:
\begtt
\margins/2 a5 (22,17,19,21)mm
\magscale[1414] \margins/1 a4 (,,,)mm
\endtt
%
The first line sets the "\hsize" and "\vsize" and margins for final
printing at a5 format. The setting on the second line centers the scaled
typesetting area to the true a4 paper while breaking points for paragraphs
and pages are unchanged. It may be usable for
review printing. After review is done, the second line can be commented out.
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