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%%%%%%%%%%%%%%%%%%%%%% rlepsf.tex %%%%%%%%%%%%%%%%
% Version 1.0 (beta test)
%
% Comments, problems etc to : cpr@maths.warwick.ac.uk
%
% Macros to relabel an eps file with TeX labels,
% written by Michael Greene, with TeX front end
% written by Colin Rourke.
%
% Designed for use with the macro package epsf.tex
% and dvips converter (written by Rokicki and Knuth)
% and with eps output from a variety of drawing
% packages (tested with output from xfig and Adobe
% Illustrator, and with hand-drawn figures).
%
% To use this package type \input rlepsf (in place of
% the usual \input epsf ). Then place each eps file
% in a \relabelbox ... \endrelabelbox with relabelling
% instructions after the \epsfbox{..} .
%
% The eps file is called exactly as usual with epsf.tex
% typical instructions being \epsfbox{filename.eps}
% and \epsfxsize dimension \epsfbox{filename.eps}
% (where "dimension" is the required finished width of
% the diagram).
%
% There are three (re)labelling macros:
%
% \relabel {pslabel}{TeX label}
% \adjustrelabel <dx,dy> {pslabel}{TeX label}
% \extralabel <x,y> {extra label}
%
% \relabel uses the ps file position for the new TeX
% label (which can be any TeX output). The new label
% is positioned with same reference point (left-hand
% end of baseline) as the original ps label.
% \adjustrelabel adjusts the position by dx,dy and
% is useful for fine tuning the position of the
% new label. \extralabel allows extra TeX labels to be
% inserted. The positions x,y are measured from the
% bottom right-hand corner of the box (so x is typically
% negative) ! The re/extra-labelling instructions can
% be given in any order and any TeX dimensions can
% be used for x,y,dx,dy.
%
% The result is a box of dimensions the original epsbox
% but with new TeX labels. This can then be inserted in
% $$ ... $$ or \centerline{ ... } for display, or
% combined with other boxes to form a larger display.
%
% The \relabelbox ... \endrelabelbox forms a TeX group;
% thus instructions for resizing text for the new labels
% (eg \small ) will remain local to this group.
%
% There are two main uses for the package :
%
% (1) Creating graphics with TeX labels :
% Draw the graphic with dummy ps labels (all different and in
% some common font eg Times-Roman). Then use \relabel 'ling
% instructions to replace the dummy labels by the genuine TeX
% labels. Use roughly the same size dummy labels as the final
% TeX labels and then the position will probably be perfect
% first time. Adjust the positions if necessary by editing
% \relabel to \adjustrelabel with appropriate <dx,dy>.
%
% (2) Editing the ps labels in an existing eps file to TeX
% labels :
% Use \relabel and \adjustrelabel to replace the
% existing labels. You may have to use \extralabel for
% some of the new labels (or to edit the eps file to change
% repeated ps labels to be different), see note (2) below.
%
% Notes:
% (1) All ps labels are removed whether or not
% instructions for relabelling are given.
% (2) If the eps file has two or more labels the
% same, then only one will be replaced. Therefore
% if you are designing a diagram from scratch then
% use different temporary ps labels for your labels
% even if you wish them to finish the same. If
% you are relabelling an existing eps diagram with TeX
% labels then use \extralabel's to replace the other
% label(s) or edit the eps file to change the repeated
% labels to different ones.
% (3) The macros are sensitive to extra spaces and
% the above syntax should be used.
% (4) The output will not view correctly on a dvi
% viewer which will typically show the new labels
% superimposed at the bottom right-hand corner.
% However those produced by \extralabel will be shown
% correctly positioned.
%
% A typical example of use is appended. More realistic
% examples are given in the postscript documentation file
% rlepsdoc.ps. CPR 16-12-96
%
%
\input epsf
%
% Initialise for MTG control
%
\special{! (MTG set-up) pop userdict /MTGdict 99 dict put MTGdict begin
/Mshow {[ MTGdict /rllist get aload length 2 add -1 roll
currentpoint transform ] MTGdict /rllist 3 2 roll put} def
/findlabel {/sought exch def
/MTGx 3 index def /MTGy 2 index def aload length 3 idiv dup 0 eq
{pop}
{{2 index sought eq
{/MTGy exch def /MTGx exch def pop}
{pop pop pop}
ifelse}
repeat}
ifelse exch MTGx exch sub exch MTGy exch sub idtransform translate
} def
end}%
%
\def\relabelbox{%
\hbox\bgroup%
\special{ps:(MTG takes control) pop
/MTGsavestate save def /p /show load def MTGdict begin gsave
/rllist [] def /save {false} def /restore {pop} def /show {Mshow} def
/ashow {Mshow pop pop} def /widthshow {Mshow pop pop pop} def /awidthshow
{Mshow 5 {pop} repeat} def /xshow {pop Mshow} def /yshow {pop Mshow} def
/xyshow {pop Mshow} def /cshow {Mshow pop} def /kshow {Mshow pop} def}%
\special{ps:/a {moveto} bind def}%
}%
\def\endrelabelbox{%
\special{ps:(MTG signs off) pop grestore end /restore {restore} bind def
MTGsavestate restore}\egroup%
}%
\def\relabel #1#2 {%
\special{ps:/a {} def}%
\special{ps:gsave /a {moveto} bind def transform MTGdict /rllist get (#1) findlabel}%
\smash{\rlap{#2}}%
\special{ps:grestore}%
}%
\def\adjustrelabel <#1,#2> #3#4 {%
\special{ps:/a {} def}%
\special{ps:gsave /a {moveto} bind def transform MTGdict /rllist get (#3) findlabel}%
\smash{\rlap{\kern #1 \raise #2\hbox{#4}}}%
\special{ps:grestore}%
}%
\def\extralabel <#1,#2> #3 {\smash{\rlap{\kern #1 \raise #2\hbox{#3}}}}%
\endinput
%
%%%% Typical example of use :
%
\input rlepsf.tex
The line before the figure.\hfil\break
\centerline{%
\relabelbox
\epsfxsize 3truein \epsfbox {figure1.eps}
%% Give label size instruction (eg \small) here.
\adjustrelabel <0pt,1pt> {Ab}{$A^b$}
\adjustrelabel <-4pt,0pt> {P}{$P$}
\relabel {Bc}{$B_c$}
\extralabel <-.3truein,0.3truein> {First extra label}
\adjustrelabel <1pt,0pt> {IP"}{$\int P''$}
\adjustrelabel <1pt,0pt> {P'}{$P'$}
\extralabel <-1.5cm,1.5cm> {Second extra label}
\endrelabelbox
}
The line after the figure.
\bye
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