%\iffalse
%<*copyright>
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% fitr.sty package,                                    %%
%% Copyright (C) 2012--2020  D. P. Story                %%
%%   dpstory@uakron.edu                                 %%
%%                                                      %%
%% This program can redistributed and/or modified under %%
%% the terms of the LaTeX Project Public License        %%
%% Distributed from CTAN archives in directory          %%
%% macros/latex/base/lppl.txt; either version 1 of the  %%
%% License, or (at your option) any later version.      %%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%</copyright>
%<package>\NeedsTeXFormat{LaTeX2e}[1997/12/01]
%<package>\ProvidesPackage{fitr}
%<package> [2020/07/09 v1.3.2 Support for FitR destinations (dps)]
%<*driver>
\documentclass{ltxdoc}
\usepackage[colorlinks,hyperindex=false]{hyperref}
\usepackage{fancyvrb,array,calc}
%\pdfstringdefDisableCommands{\let\\\textbackslash}
\EnableCrossrefs
\CodelineIndex
\RecordChanges
\let\env\texttt
\let\opt\texttt
\let\app\textsf
\let\pkg\textsf
\def\EXCL{!}
\def\nmpsep#1{\hskip-\marginparsep\texttt{#1}}
\bgroup\ttfamily
\gdef\brpr#1{\char123\relax#1\char125\relax}\egroup
\let\darg\brpr
\def\ameta#1{\ensuremath{\langle\textsl{\texttt{#1}}\rangle}}
\def\meta#1{\textsl{\texttt{#1}}}
\def\SUB#1{\ensuremath{{}_{\mbox{\scriptsize\ttfamily#1}}}}
\def\cs#1{\texttt{\bslash#1}}
\DeclareRobustCommand{\tmspace}[3]{%
  \ifmmode\mskip#1#2\else\kern#1#3\fi\relax}
\renewcommand{\,}{\tmspace+\thinmuskip{.1667em}}
\let\thinspace\,
\renewcommand{\!}{\tmspace-\thinmuskip{.1667em}}
\let\negthinspace\!
\renewcommand{\:}{\tmspace+\medmuskip{.2222em}}
\let\medspace\:
\newcommand{\negmedspace}{\tmspace-\medmuskip{.2222em}}
\renewcommand{\;}{\tmspace+\thickmuskip{.2777em}}
\let\thickspace\;
\newcommand{\negthickspace}{\tmspace-\thickmuskip{.2777em}}
\makeatletter
\renewcommand{\paragraph}
    {\@startsection{paragraph}{4}{0pt}{6pt}{-3pt}
    {\normalfont\normalsize\bfseries}}
\renewenvironment{quote}[1][]
   {\def\@rgi{#1}\ifx\@rgi\@empty
    \let\rghtm\@empty\else\def\rghtm{\rightmargin\leftmargin}\fi
    \list{}{\rghtm} %{\rightmargin\leftmargin}%
    \item\relax}
   {\endlist}
\makeatother
\InputIfFileExists{aebdocfmt.def}{\PackageInfo{fitr}{Inputting aebdocfmt.def}}
    {\def\IndexOpt{\DescribeMacro}\def\IndexKey{\DescribeMacro}\let\setupFullwidth\relax
     \PackageInfo{fitr}{aebdocfmt.def cannot be found}}
\begin{document}
\def\CMD#1{\textbackslash#1}
  \GetFileInfo{fitr.sty}
  \title{\textsf{fitr}: Creating \textsf{FitR} Destinations}
  \author{D. P. Story\\
    Email: \texttt{dpstory@acrotex.net}}
  \date{processed \today}
  \maketitle
  \tableofcontents
  \let\Email\texttt
  \DocInput{fitr.dtx}
\IfFileExists{\jobname.ind}{\newpage\setupFullwidth\PrintIndex}{\paragraph*{Index}
    The index goes here.\\Execute
    \texttt{makeindex -s gind.ist -o fitr.ind fitr.idx} on the command line
    and recompile \texttt{fitr.dtx}.}
\IfFileExists{\jobname.gls}{\PrintChanges}{\paragraph*{Change History} The list of
    changes goes here.\\Execute
    \texttt{makeindex -s gglo.ist -o fitr.gls fitr.glo} on the command line
    and recompile \texttt{fitr.dtx}.}
\end{document}
%</driver>
% \fi
%
% \MakeShortVerb{|}
% \InputIfFileExists{aebdonotindex.def}{\PackageInfo{artthreads}{Inputting aebdonotindex.def}}
%    {\PackageInfo{fitr}{aebdonotindex.def cannot be found}}
%
%    \begin{macrocode}
%<*package>
%    \end{macrocode}
%
%
% \paragraph*{Introduction.}
%
% This package supports \textsf{dvips} and \textsf{dvipsone} utilities,
% and assumes the PDF creator is \textbf{Adobe Distiller}. It also supports
% the \textsf{pdflatex} (and lualatex) executable through the \texttt{pdftex} option;
% the options \texttt{dvipdfm}, \texttt{dvipdfmx}, and \texttt{xetex} support the
% corresponding executables.
%
% When using a dvi-ps-pdf work flow (with Distiller as the PDF creator), the
% package uses the \textbf{pdfmark} for the \textsf{FitR} view-type destination:
%\begin{Verbatim}[xleftmargin=\parindent,codes={\catcode`\%=9},commandchars={!()}]
% [ /Dest/!ameta(name)/View [ /FitR left bottom right top ]/DEST pdfmark
%\end{Verbatim}
% For the \opt{pdftex} or \opt{luatex} option, we use \cs{pdfdest} a primitive of
% that utility:
%\begin{Verbatim}[xleftmargin=\parindent,codes={\catcode`\%=9},commandchars={!()}]
%\pdfdest name {!ameta(name)} fitr
%   width  !ameta(wd)
%   height !ameta(ht)
%   depth  !ameta(dp)
%\end{Verbatim}
% For the \opt{dvipdfm}, \opt{dvipdfmx}, and \opt{xetex} options,
% the problem of computing the \textsf{FitR} rectangle is a little trickier.
%\begin{Verbatim}[xleftmargin=\parindent,codes={\catcode`\%=9},commandchars={!~^}]
%\@pdfm@mark{dest (!ameta~name^) %
%   [ @thispage /FitR @xpos @ypos @urx!ameta~name^ @ury!ameta~name^ ]}}}}%
%\end{Verbatim}
%where \texttt{@urx\ameta{name}} and \texttt{@ury\ameta{name}} are the calculated upper right $x$ and
%$y$ coordinate of the bounding box.\par
%\medskip\noindent
%The \textsl{PDF Reference} describes \textsf{FitR} as,
%\begin{quote}
%    Display the page designated by page, with its contents
%    magnified just enough to fit the rectangle specified by the
%    coordinates \textsl{left}, \textsl{bottom}, \textsl{right}, and \textsl{top} entirely within the
%    window both horizontally and vertically.
%\end{quote}
% This type of destination allows for the creation of a link or form button
% to zoom in on a rectangular region.
%
% \section{Options and Required Packages}
%   \changes{v1.3.2}{2020/07/09}{Bad upload for v1.3.1, corrected problem.}
%    \begin{macrocode}
\RequirePackage{xkeyval}
\RequirePackage{ifpdf}[2006/02/20]
\RequirePackage{ifxetex}[2006/08/21]
%    \end{macrocode}
%   (2020/07/03) Added \pkg{ifluatex} package for later testing
%   \changes{v1.3}{2020/07/03}{Added \string\pkg{ifluatex} package}
%    \begin{macrocode}
\RequirePackage{ifluatex}
%    \end{macrocode}
% \paragraph*{Driver options.} Three options, \IndexOpt{dvips}\IndexOpt{dvipsone}\app{dvips} (the default)
% and \app{dvipsone}, both of which require \textbf{Adobe Distiller}
% as the PDF creator; the \IndexOpt{pdftex}\app{pdflatex} and \IndexOpt{luatex}\app{luatex} allows for the same functionality
% for the \textsf{pdflatex} executable. We also support \IndexOpt{dvipdfm}\IndexOpt{dvipdfmx}\IndexOpt{xetex}\texttt{dvipdfm}
% and its extensions, \texttt{dvipdfmx} and \texttt{xetex}.
%
% \paragraph*{Auto detection of drivers.} The drivers \app{pdflatex}, \app{lualatex}, and \app{xelatex} are automatically
% detected, so there is no need to specify their respective options: \opt{pdftex}, \opt{luatex}, and \app{xetex}.
%
% \paragraph*{Preview options.} The \IndexOpt{preview}\texttt{preview}
% option is a carry over from \pkg{eforms}. When selected, all form fields are outlined; useful when
% setting the location of fields in a dvi previewer. The other option is \opt{viewMagWin}
% \IndexOpt{viewMagWin} will show the viewing windows surrounding the target. This is the rectangle
% that will be jumped to. Use this option to adjust the size of the window to your needs.
% When either of the last two options has an exclamation point prior, that means to
% turn off the switch. You can conveniently use \texttt{viewMagWin} to see the viewing window,
% then change it to \IndexOpt[\protect\EXCL]{!viewMagWin}\opt{!viewMagWin} to remove the visible window. Cool.
% Similarly, you can turn off \opt{preview} using \IndexOpt[\protect\EXCL]{!preview}\opt{!preview}.
%    \begin{macrocode}
%    \end{macrocode}
% We create \cs{ifpreview} and \cs{ifviewMagWin}, and declare the options.
%    \begin{macrocode}
\@ifundefined{ifpreview}{\newif\ifpreview \previewfalse}{}
\@ifundefined{ifviewMagWin}{\newif\ifviewMagWin \viewMagWinfalse}{}
\let\fitr@driver\@empty
%    \end{macrocode}
% The \opt{pdftex} option
%    \begin{macrocode}
\DeclareOptionX{pdftex}{\gdef\fitr@driver{pdftex}%
  \PassOptionsToPackage{\fitr@driver}{hyperref}%
  \PassOptionsToPackage{\fitr@driver}{eforms}}
\def\fitr@pdftex@driver{pdftex}
%    \end{macrocode}
% The \opt{luatex} option
%    \begin{macrocode}
\DeclareOptionX{luatex}{\gdef\fitr@driver{luatex}%
  \PassOptionsToPackage{\fitr@driver}{hyperref}%
  \PassOptionsToPackage{\fitr@driver}{eforms}}
\def\fitr@pdftex@driver{luatex}
%    \end{macrocode}
% Distiller based drivers.
%    \begin{macrocode}
\DeclareOptionX{dvips}{\gdef\fitr@driver{dvips}%
  \PassOptionsToPackage{\fitr@driver}{hyperref}%
  \PassOptionsToPackage{\fitr@driver}{eforms}}
\def\fitr@dvips@driver{dvips}
\DeclareOptionX{dvipsone}{\gdef\fitr@driver{dvipsone}%
  \PassOptionsToPackage{\fitr@driver}{hyperref}%
  \PassOptionsToPackage{\fitr@driver}{eforms}}
\def\fitr@dvipsone@driver{dvipsone}
%    \end{macrocode}
% \app{dvipdfm} and its variants.
%    \begin{macrocode}
\newif \if@fitr@dvipdfm \@fitr@dvipdfmfalse
\DeclareOptionX{dvipdfm}{\gdef\fitr@driver{dvipdfm}%
  \@fitr@dvipdfmtrue
  \PassOptionsToPackage{\fitr@driver}{hyperref}%
  \PassOptionsToPackage{\fitr@driver}{eforms}}
\def\fitr@dvipdfm@driver{dvipdfm}
\DeclareOptionX{dvipdfmx}{\gdef\fitr@driver{dvipdfmx}%
  \@fitr@dvipdfmtrue
  \PassOptionsToPackage{\fitr@driver}{hyperref}%
  \PassOptionsToPackage{\fitr@driver}{eforms}}
\def\fitr@dvipdfmx@driver{dvipdfmx}
\DeclareOptionX{xetex}{\gdef\fitr@driver{xetex}%
  \@fitr@dvipdfmtrue
  \PassOptionsToPackage{\fitr@driver}{hyperref}%
  \PassOptionsToPackage{\fitr@driver}{eforms}}
\def\fitr@xetex@driver{xetex}
%    \end{macrocode}
%     \leavevmode
%     \IndexOpt{preview}^^A
%     \IndexOpt[\protect\EXCL]{!preview}^^A
%     \IndexOpt{viewMagWin}^^A
%     \IndexOpt[\protect\EXCL]{!viewMagWin}^^A
%     Various preview options.
%    \begin{macrocode}
\DeclareOptionX{preview}{\previewtrue}
\DeclareOptionX{!preview}{\previewfalse}
\DeclareOptionX{viewMagWin}{\viewMagWintrue}
\DeclareOptionX{!viewMagWin}{\viewMagWinfalse}
%    \end{macrocode}
%    \leavevmode
%    \DescribeMacro{\previewOn}^^A
%    \DescribeMacro{\previewOff}^^A
%    \DescribeMacro{\viewMagWinOn}^^A
%    \DescribeMacro{\viewMagWinOff}^^A
%    Some convenience macros to locally turn on or off \opt{preview} and
%    \opt{viewMagWin}.
%    \changes{v1.3.1}{2020/07/06}{Added commands to locally turn on the \string\opt{preview}
%    and \string\opt{viewMagWin} options}
%    \begin{macrocode}
\providecommand{\previewOn}{\previewtrue}
\providecommand{\previewOff}{\previewfalse}
\providecommand{\viewMagWinOn}{\viewMagWintrue}
\providecommand{\viewMagWinOff}{\viewMagWinfalse}
%    \end{macrocode}
%    \leavevmode\IndexOpt{gonative}^^A
%    When the \opt{gonative} option is specified, field and document JavaScript
%    \emph{are not used}, as a result, no special effects are implemented.
%    This gives a basic document that can be compiled successfully
%    with the \app{dvips\,\texttt{->}\,ps2pdf} workflow.
%    \changes{v1.3.1}{2020/07/06}{Added \string\opt{gonative} option}
%    \begin{macrocode}
\newif\ifFRusedljs \FRusedljstrue
\DeclareOptionX{gonative}{\FRusedljsfalse}
%    \end{macrocode}
%    \leavevmode\IndexOpt{blinkonjmp}^^A
%    \IndexOpt[\protect\EXCL]{!blinkonjmp}^^A
%    Target region blinks on jump
%    \changes{v1.3.1}{2020/07/06}{Added \string\opt{blinkonjmp} and \string\opt{!blinkonjmp} options}
%    \begin{macrocode}
\newif\ifFRblinkonjmp \FRblinkonjmpfalse
\DeclareOptionX{blinkonjmp}{\FRblinkonjmptrue}
\DeclareOptionX{!blinkonjmp}{\FRblinkonjmpfalse}
%    \end{macrocode}
%    \leavevmode\IndexOpt{blinkonrestore}^^A
%    \IndexOpt[\protect\EXCL]{!blinkonrestore}^^A
%    Target region blinks on restore
%    \changes{v1.3.1}{2020/07/06}{Added \string\opt{blinkonrestore} and \string\opt{!blinkonrestore} options}
%    \begin{macrocode}
\newif\ifFRblinkonrestore \FRblinkonrestorefalse
\DeclareOptionX{blinkonrestore}{\FRblinkonrestoretrue}
\DeclareOptionX{!blinkonrestore}{\FRblinkonrestorefalse}
%    \end{macrocode}
%    \leavevmode\IndexOpt{blink}^^A
%    \IndexOpt[\protect\EXCL]{!blink}^^A
%    A convenience option, \opt{blink} is equivalent to \opt{blinkonjmp} and \opt{blinkonrestore}.
%    \changes{v1.3.1}{2020/07/06}{Added \string\opt{blink} and \string\opt{!blink} options}
%    \begin{macrocode}
\DeclareOptionX{blink}{\FRblinkonjmptrue\FRblinkonrestoretrue}
\DeclareOptionX{!blink}{\FRblinkonjmpfalse\FRblinkonrestorefalse}
%    \end{macrocode}
% Before processing options, try for automatic driver detection.
%    \begin{macrocode}
\@ifpackageloaded{web}{\ExecuteOptionsX{\eq@driver@name}}{%
  \ifluatex\ExecuteOptionsX{pdftex}\else
  \ifpdf\ExecuteOptionsX{pdftex}\else
  \ifxetex\ExecuteOptionsX{xetex}\else
  \@ifundefined{l@tex@@@@driver}{\ExecuteOptionsX{dvips}}
      {\ExecuteOptionsX{dvipsone}}\fi\fi\fi
}
%    \end{macrocode}
% \paragraph*{Process the options}
%    \begin{macrocode}
\ProcessOptionsX
%    \end{macrocode}
% \paragraph*{Required packages}
%    \begin{macrocode}
\RequirePackage{xcolor}
%    \end{macrocode}
% Minimal packages \pkg{calc} and \pkg{eforms} (which inputs \pkg{hyperref}).
%    \begin{macrocode}
%\RequirePackage{hyperref}
\RequirePackage{eforms}[2020/07/05]
\RequirePackage{calc}
%    \end{macrocode}
% We also require \textsf{collectbox}, a cool way of collecting an argument which enables
% the use of verbatim text. Written by Martin Scharrer.
%    \begin{macrocode}
\RequirePackage{collectbox}
%    \end{macrocode}
% \section{The Main Code}
% Some scratch counters, lengths, boxes.
%    \begin{macrocode}
\newcounter{magCnt}
\newbox\fitr@bbox
\newcount\fitr@height
\newcount\fitr@width
\newcount\fitr@depth
\newlength\fitr@length
%    \end{macrocode}
%   For \app{xelatex} we adjust field sizes to conform to the same sizes produced
%   by \app{pdflatex} and \app{latex}. For \app{lualatex}, make a definition
%   so it can be process just like \app{pdflatex}.
%   \changes{v1.3}{2020/07/03}{Add a test for xetex and luatex}
%    \begin{macrocode}
\ifxetex\makeXasPDOff\fi
\ifluatex\protected\def\pdfdest{\pdfextension dest }\fi
%    \end{macrocode}
%    \begin{macro}{\get@fitr@dimen}\nmpsep{\darg{\ameta{content}}}
%    Tthis command encloses \ameta{content}
%    in the box register \cmd{\fitr@bbox} (an \cs{hbox}) and transfers
%    dimension info to the count registers \cmd{\fitr@height},
%    \cmd{\fitr@width}, and \cmd{\fitr@depth}.  To typeset \ameta{content},
%    \cmd{\unhbox}\cmd{\fitr@bbox}.
%    \begin{macrocode}
\def\get@fitr@dimen#1{%
  \setbox\fitr@bbox=\hbox{#1}%
  \fitr@height=\ht\fitr@bbox
    \xdef\fitr@height@l{\the\ht\fitr@bbox}%
  \fitr@width=\wd\fitr@bbox
    \xdef\fitr@width@l{\the\wd\fitr@bbox}%
  \fitr@depth=\dp\fitr@bbox
    \xdef\fitr@depth@l{\the\dp\fitr@bbox}%
  \setlength\fitr@length{\ht\fitr@bbox+\dp\fitr@bbox}%
  \edef\fitr@@height{\the\fitr@length}%
}
%    \end{macrocode}
%    \end{macro}
% \paragraph*{dvips.} The following commands are some PostScript for the \textsf{dvips} executable.
%    \begin{macrocode}
%    \end{macrocode}
% \leavevmode\DescribeMacro\FitRbboxB\nmpsep{\darg{\ameta{amt-wd}}\darg{\ameta{amt-ht}}}
%    \begin{macrocode}
\def\fitr@urxury@fixup#1#2#3{}
\ifx\fitr@driver\fitr@dvips@driver
\headerps@out{/TeXtoPDF {65536 div DVImag mul} def % sp to pts
/SPtoDvips{TeXtoPDF PDFToDvips} def} % sp to dots
\def\FitRbboxB#1#2{% Uses \fitr@bbox
  currentpoint 2 copy DvipsToPDF \the\fitr@depth\space TeXtoPDF add
  neg vsize add 72 sub #2\space sub exch          % y1
  DvipsToPDF 72 add #1\space sub exch             % x1
  4 2 roll exch DvipsToPDF \the\fitr@width\space
  TeXtoPDF add 72 add #1\space add exch           % x2
  DvipsToPDF \the\fitr@height \space TeXtoPDF sub
  neg vsize add 72 sub #2\space add}              % y2
\else
\ifx\fitr@driver\fitr@dvipsone@driver
%    \end{macrocode}
% \paragraph*{dvipsone.} Definition of \cs{FitRbbox} for \app{dvipsone}.
%    \begin{macrocode}
\special{!/TeXtoPDF {65536 div mag 1000 div mul} def
/PDFtoTeX {65536 mul mag 1000 div div} def}
\def\FitRbboxB#1#2{%
   currentpoint 2 copy \the\fitr@depth\space add DvipsToPDF
   neg PageHeight add 72 sub #2\space sub      % y1
   exch DvipsToPDF 72 add #1\space sub exch    % x1
   4 2 roll exch \the\fitr@width\space add
   DvipsToPDF 72 add #1\space add exch         % x2
   \the\fitr@height\space sub DvipsToPDF neg
   PageHeight add 72 sub #2\space add}         % y2
\else\ifpdf
%    \end{macrocode}
% \paragraph*{pdftex.} Definition of \cs{FitRbbox} for \app{pdftex} and \app{luatex}.
%  Uses \cmd{\fitr@bbox}; \texttt{\#1} is amount to widen box;
% \texttt{\#2} amount to heighten box.
%
% This version of \cs{FitRbbox} expands the bounding rectangle to
% the viewing window by increasing the dimensions of width, height
% and depth. It saves these values in the macros
% \cs{fitr@pdftex@view@width\string|height\string|depth}.
%    \begin{macrocode}
\def\FitRbboxB#1#2{%
  \fitr@length=#1bp
  \fitr@length=2\fitr@length
  \advance\fitr@length\wd\fitr@bbox
  \edef\fitr@pdftex@view@width{\the\fitr@length}%
  \fitr@length=#2bp
  \advance\fitr@length\ht\fitr@bbox
  \edef\fitr@pdftex@view@height{\the\fitr@length}%
  \fitr@length=#2bp
  \advance\fitr@length\dp\fitr@bbox
  \edef\fitr@pdftex@view@depth{\the\fitr@length}%
}
\else\if@fitr@dvipdfm
%    \end{macrocode}
% \paragraph*{dvipdfm/dvipdfmx/xetex.} The primitive \verb!\special{pdf: dest (name)...}! is used
% along with the primitive variables \texttt{@xpos} and \texttt{@ypos}. The third argument is \ameta{name}.
%    \begin{macrocode}
\def\FitRbboxB#1#2#3{%
  \smash{\raisebox{-\fitr@depth@l-#2bp}%
    {\makebox[0pt][l]{\hspace*{-#1bp}%
%    \end{macrocode}
% The values of \texttt{@xpos} and \texttt{@ypos} correspond to the coordinates
% of the lower left corner. The values of  \texttt{@urx\#3} and \texttt{@ury\#3}
% are calculated in \cs{fitr@urxury@fixup} as the coordinates of the upper right
% corner.
%    \begin{macrocode}
  \@pdfm@mark{dest (#3) %
    [ @thispage /FitR @xpos @ypos @urx#3\space @ury#3\space ]}}}}}
%    \end{macrocode}
% \cs{fitr@urxury@fixup} is placed just after \cs{fitr@bbox}.
%    \begin{macrocode}
\def\fitr@urxury@fixup#1#2#3{%
  \smash{\raisebox{\fitr@height@l+#2bp}%
  {\makebox[0pt][l]{\hspace*{#1bp}%
%    \end{macrocode}
% We raise up to the upper right corner of the content box and define
% \texttt{@urx\#3} and \texttt{@ury\#3} as the current values of
% \texttt{@xpos} and \texttt{@ypos},
%    \begin{macrocode}
  \@pdfm@mark{obj @urx#3\space @xpos}%
  \@pdfm@mark{obj @ury#3\space @ypos}}}}%
}
\fi\fi\fi\fi
%    \end{macrocode}
%     We use a short macro from \pkg{graphics} package.
%     We do not require the \pkg{graphics} command
%     so we redefine it under a different name.
%    \begin{macrocode}
\def\fitr@defaultbp#1#2{%
  \afterassignment\fitr@def@bp\dimen@#2bp\relax{#1}{#2}}
\def\fitr@def@bp#1\relax#2#3{%
  \if!#1!%
   \def#2{#3}%
  \else
    \dimen@.99626\dimen@
    \edef#2{\strip@pt\dimen@}%
  \fi}
%    \end{macrocode}
% The major command of this package is \cs{jdRect}. Its second required argument
% has several key-value pairs that are recognized.
% Options for the \cs{jdRect} command.
%
% \medskip\noindent\IndexKey{lift}^^A
% is the amount of lift (performed by \cs{raisebox}. The value
% can be a positive or negative length. Positive to translate upward, negative to translate downward.
% The default is \texttt{0pt}.
%    \begin{macrocode}
\define@key{fitr}{lift}[0pt]{{\setlength\@tempdima{#1}%
  \xdef\fitr@temp@length{\the\@tempdima}}%
  \edef\fitr@@lift{\fitr@temp@length}}
\def\fitr@@lift{0pt}
%    \end{macrocode}
% \leavevmode\IndexKey{shift}^^A
% is the amount of horizontal shift, positive to the right, negative to the left.
% The default is \texttt{0pt}
%    \begin{macrocode}
\define@key{fitr}{shift}[0pt]{{\setlength\@tempdima{#1}%
  \xdef\fitr@temp@length{\the\@tempdima}}%
  \edef\fitr@@shift{\fitr@temp@length}}
\def\fitr@@shift{0pt}
%    \end{macrocode}
% \leavevmode
% \IndexKey{width}^^A
% \IndexKey{height}^^A
% are the dimensions of the bounding box
% for the button/view rectangle. These dimensions are ignored when the first optional
% parameter of \cmd{\jdRect} is nonempty.
%    \begin{macrocode}
\define@key{fitr}{width}[0pt]{{\setlength\@tempdima{#1}%
  \xdef\fitr@temp@length{\the\@tempdima}}%
  \edef\fitr@@width{\fitr@temp@length}}
\def\fitr@@width{0pt}
\define@key{fitr}{height}[0pt]{{\setlength\@tempdima{#1}%
  \xdef\fitr@temp@length{\the\@tempdima}}%
  \edef\fitr@@height{\fitr@temp@length}}
\def\fitr@@height{0pt}
%    \end{macrocode}
% \leavevmode\IndexKey{ref}^^A
% is the reference point. Values are \texttt{t} (the default),
% \texttt{c} center, and \texttt{b} bottom. When the optional first parameter of
% \cmd{\jdRect} is nonempty, the default is \texttt{b}.
%    \begin{macrocode}
\define@choicekey+{fitr}{ref}[\val\nr]{t,c,b}[t]%
  {\edef\fitr@@refPt{\val}}{}
\def\fitr@@refPt{t}
%    \end{macrocode}
% \leavevmode
% \IndexKey{adddestw}^^A
% \IndexKey{adddesth}^^A
% add additional length around
% the (internal) box. This larger rectangle is the view window.
%    \begin{macrocode}
\define@key{fitr}{adddestw}[0]{%
  \fitr@defaultbp{\fitr@@adddestw}{#1}}
\def\fitr@@adddestw{0}
\define@key{fitr}{adddesth}[0]{%
  \fitr@defaultbp{\fitr@@adddesth}{#1}}
\def\fitr@@adddesth{0}
%    \end{macrocode}
% \leavevmode
% \IndexKey{button}^^A
% is a Boolean. If \texttt{true} (the default), \cmd{\jdRect}
% creates a push button around the content. When the user pushes the button, the viewer
% zooms in to the view window. Clicking again restores the previous view. When \texttt{button}
% is \texttt{false}, the button is not created, but the viewing window is. You can then jump to the
% viewing window with a separate link or button.
%    \begin{macrocode}
\define@boolkey{fitr}{button}[true]{}
\KV@fitr@buttontrue
%    \end{macrocode}
% \leavevmode
% \IndexKey{link}^^A
% is an key, which if taken, a link rather than a push button,
% is created. The \texttt{link} key takes one of two values: \texttt{jmp}, \texttt{restore}.
% \begin{itemize}
% \item When \texttt{link=jmp}, a link is created that jumps to the destination determined by
% \texttt{dest}. This value is designed for external links for jumping to a rectangular region
% Use the key \texttt{nodest} to keep \cs{jdRect} from creating a destination at the link location.
% \item When \texttt{link=restore}, again, a link is created around the content, a restore last view
% action is associated with the link; clicking on it jumps back to the view at the time you jumped.
% \end{itemize}
%    \begin{macrocode}
\define@choicekey+{fitr}{link}[\val\nr]{jmp,restore}[]
    {\edef\fitr@@link{\nr}}{}
\let\fitr@@link\@empty
%    \end{macrocode}
% \leavevmode
% \IndexKey{nodest}^^A
% is a Boolean, which if \texttt{true},
% causes \cs{jdRect} not to generate a destination at the current link (or button).
%    \begin{macrocode}
\define@boolkey{fitr}{nodest}[true]{}
\KV@fitr@nodestfalse
%    \end{macrocode}
% \leavevmode
% \IndexKey{dest}^^A
% When \texttt{button=true} (the default), the name of the destination
% is automatically generated, internally. When \texttt{button=false}, you need to specify
% a destination to reference in a separate link or push button.
%    \begin{macrocode}
\define@key{fitr}{dest}[]{\def\fitr@@dest{#1}}
\let\fitr@@dest\@empty
%    \end{macrocode}
% \leavevmode\IndexKey{allowFX}^^A
% A Boolean switch (of sorts). The \texttt{fitr} package
%    allows for special effects (FX) when a viewing window is jumped to
%    and when the view is restored. The default value of
%    \texttt{allowFX} is \texttt{true} allow special effects if there
%    are any defined. By saying \texttt{allowFX=false}, no special
%    effects are used, even if some are defined.
%    \begin{macrocode}
\define@choicekey+{fitr}{allowFX}[\val\nr]{true,false}[true]%
  {\edef\fitr@allowFX{\val}}{}
\newcommand{\allowFXDefault}{true}
\let\fitr@allowFX\@empty
%    \end{macrocode}
% \paragraph{The main command.}
% \DescribeMacro{\jdRect} \cs{jdRect} (optionally) \underbar{j}umps to and/or sets
% a \underbar{d}estination of a \textsf{Fit\underbar{R\normalfont ect}}angle.\footnote{I had some problems naming this command.}
% This command is multi-functional.
% This is the default behavior (\texttt{button=true}). The command creates two
% rectangular regions (which can be viewed using the \texttt{preview} and \texttt{viewMagWin}).
% \begin{center}\setlength\fboxsep{0pt}
%   \fbox{\parbox[c][.9in]{2.4in}
%        {\vfill\hfil\fbox{\parbox[c][.5in]{2in}{\vfill\hfill}}\hfil\vfill}}
% \end{center}
% The inner-box represents the bounding rectangle of the push button (or link) that is created
% when \texttt{button=true} (or \texttt{link=jmp\string|restore}). The outer rectangle is the \emph{view window}, the window
% that is magnified to (the dimensions of this rectangle set by the four \textsf{FitR}
% parameters. Normally, the inner and outer rectangles are the same, unless the author
% specifies values of \texttt{adddestw} and \texttt{adddesth}. The picture above is that
% can be produced by setting
%\begin{verbatim}
%    width=2in,height=.5in,adddestw=.2in,adddesth=.2in
%\end{verbatim}
% The inner rectangle may be seen by using the option \texttt{preview}, the outer once
% can be see by using the option \texttt{viewMagWin}.
%
% Now if \texttt{button=false}, \cs{jdRect} only sets the destination;
% it does not create the inner push button. A separate link or push button
% needs to be created to jump to the view window.
%
%\medskip\noindent Syntax for \cs{jdRect} has two forms:
%\begin{quote}
% \cs{jdRect[\ameta{KV-pairs}]}
%\end{quote}
% The above version is used to overlay a region with a button and view window.
% No content is specified, but is defined by specifying the \texttt{width} and \texttt{height};
% it can be positioned using \texttt{shift} and \texttt{lift}.
%
% There is a \texttt{*}-version as well:
%\begin{quote}
% \cs{jdRect*[\ameta{KV-pairs}]\darg{\ameta{content}}}
%\end{quote}
% The second parameter \meta{content} is required when the \texttt{*} is present.
% This version is meant to enclose \ameta{content} within the button and view window.
% \texttt{width} and \texttt{height} are ignored, but \texttt{shift} and \texttt{lift} are obeyed (though
% you may \texttt{shift} or \texttt{lift} the button/view window away from the content).
%    \begin{macrocode}
\newcommand{\jdRect}{\begingroup
  \@ifstar{\let\fitr@istar\ef@One\set@rectjd}%
    {\let\fitr@istar\ef@Zero\set@rectjd}}
%    \end{macrocode}
% For links, we use the link color of \textsf{hyperref}. The definition of
% \cmd{\ef@colorthislink} is in \textsf{eforms}.
%    \begin{macrocode}
\@eqlinktxtcolor{\@linkcolor}
\newcommand{\fitr@bcode}{\ef@colorthislink}%
%    \end{macrocode}
% Second stage in the expansion of \cmd{\jdRect}.
%    \begin{macrocode}
\newcommand{\set@rectjd}[1][]{\def\fitr@jdrect@argi{#1}%
%    \end{macrocode}
% We process the key-values before gathering the \cs{collectbox}
% so we can insert the link color, if this is a link!
%    \begin{macrocode}
  \edef\temp@exp{\noexpand\setkeys{fitr}{#1}}\temp@exp
  \ifx\fitr@@link\@empty\let\fitr@bcode\relax\fi
%    \end{macrocode}
% If this is \cs{jdRect*}, we collect the second argument using
% \cs{collectbox}, and move on to \cs{set@@rectjd}.
%    \begin{macrocode}
  \ifx\fitr@istar\ef@One
    \def\fitr@next{\collectbox[\fitr@bcode]{\set@@rectjd}}\else
%    \end{macrocode}
% Otherwise, we just move on to \cs{set@@rectjd}.
%    \begin{macrocode}
    \def\fitr@next{\set@@rectjd}\fi\fitr@next}
%    \end{macrocode}
% The third and final stage in the expansion of \cs{jdRect}
%    \begin{macrocode}
\def\set@@rectjd{%
  \stepcounter{magCnt}\def\fitr@setBL{0pt}%
  \ifx\fitr@@dest\@empty
    \def\fitr@namedDest{fitrDestn\the\value{magCnt}}\else
    \edef\fitr@namedDest{\fitr@@dest}\fi
  \ifx\fitr@istar\ef@One\def\fitr@@refPt{b}\fi
%    \end{macrocode}
% If the user specifies the \texttt{link} option, we cancel the \texttt{button} option.
%    \begin{macrocode}
  \ifx\fitr@@link\@empty\else\KV@fitr@buttonfalse\fi
%    \end{macrocode}
% If content is explicitly passed in the optional second parameter
% we put it in a box and take its measurements. We'll insert the content
% instead of an empty filled \cs{parbox}.
%    \begin{macrocode}
  \ifx\fitr@istar\ef@One
    \edef\fitr@@width{\the\wd\collectedbox}%
    \edef\fitr@setBL{\the\dp\collectedbox}%
    \setlength{\fitr@length}{\ht\collectedbox+\dp\collectedbox}%
    \edef\fitr@@height{\the\fitr@length}%
  \fi
%    \end{macrocode}
% Now, we fit the content into \cs{fitr@bbox} using \cs{get@fitr@dimen}.
%    \begin{macrocode}
  \ifx\fitr@@link\@empty
    \ifKV@fitr@button\let\fitr@FLB@ction\fitr@OverlayJmpBtn\else
%    \end{macrocode}
% \cs{Bbox} is defined in \textsf{eforms}.
%    \begin{macrocode}
    \@ifundefined{ef@Bbox}{\let\fitr@FLB@ction\Bbox}%
      {\let\fitr@FLB@ction\ef@Bbox}\fi
    \else\def\fitr@FLB@ction{\hfill\vfill\@gobbletwo}\fi
%    \end{macrocode}
% And overlay the button/link/box
%    \begin{macrocode}
  \get@fitr@dimen{%
    \parbox[\fitr@@refPt][\fitr@@height]{\fitr@@width}%
    {\kern0pt\fitr@FLB@ction{\fitr@@width}{\fitr@@height}\kern0pt}}%
%    \end{macrocode}
% Now place the button/box according to the user's options.
%    \begin{macrocode}
  \makebox[0pt][l]{\hspace*{\fitr@@shift}\smash{%
    \raisebox{\fitr@@lift-\fitr@setBL}{%
    \ifKV@fitr@nodest\else\setFitRDest{\fitr@@adddestw}%
      {\fitr@@adddesth}{\fitr@namedDest}\fi
    \unhbox\fitr@bbox\ifKV@fitr@nodest\else\fitr@urxury@fixup
      {\fitr@@adddestw}{\fitr@@adddesth}{\fitr@namedDest}\fi
  }}}%
  \setlength{\fboxsep}{0pt}%
%    \end{macrocode}
% We attempt to represent the bounding box of the view window.
% We display the bounding view window only if the \texttt{nodest}
% option was not taken, and the \cs{ifviewMagWin} is true.
%    \begin{macrocode}
  \ifKV@fitr@nodest\else\ifviewMagWin
    \fitr@length=\fitr@@adddestw bp
    \fitr@length=2\fitr@length
    \addtolength{\fitr@length}{\fitr@@width}%
    \edef\fitr@@width{\the\fitr@length}%
    \fitr@length=\fitr@@adddesth bp
    \fitr@length=2\fitr@length
    \addtolength{\fitr@length}{\fitr@@height}%
    \edef\fitr@@height{\the\fitr@length}%
    \setlength\fitr@length{-\fitr@@adddestw bp}%
    \addtolength\fitr@length{\fitr@@shift}%
    \makebox[0pt][l]{\hspace*{\fitr@length}\smash{%
      \setlength\fitr@length{\fitr@@lift-\fitr@setBL}%
      \if\fitr@@refPt b%
        \addtolength\fitr@length{-\fitr@@adddesth bp}\else
      \if\fitr@@refPt t%
        \addtolength\fitr@length{\fitr@@adddesth bp}%
      \fi\fi
      \raisebox{\fitr@length}%
      {\fbox{\parbox[\fitr@@refPt][\fitr@@height]%
      {\fitr@@width}{\kern0pt\hfill\vfill\kern0pt}}}}%
    }%
  \fi\fi
%    \end{macrocode}
% If the user passes content through the optional first parameter, we
% typeset it to the right of the material above (which did not change
% the position of the current point.
%    \begin{macrocode}
  \if\fitr@@link\ef@Zero
    \let\fitr@FLB@ction\fitr@OverlayJmpLnk\else
  \if\fitr@@link\ef@One
    \let\fitr@FLB@ction\fitr@OverlayRestoreLnk\else
  \let\fitr@FLB@ction\relax\let\fitr@bcode\relax\fi\fi
  \ifx\fitr@istar\ef@One
    \gdef\fitr@next{\fitr@FLB@ction{\BOXCONTENT}}\else
  \let\fitr@next\relax\fi\fitr@next
  \endgroup}
%    \end{macrocode}
% The code for the \textbf{\textsf{FitR}} destination.
%    \begin{macrocode}
\def\setFitRDest#1#2#3{%
  \if@fitr@dvipdfm
    \FitRbboxB{#1}{#2}{#3}%
  \else
    \ifpdf
      \FitRbboxB{#1}{#2}%
%    \end{macrocode}
% We shift the rectangle \texttt{\#1bp} to the left without changing
% the current point. Then use the \textsf{pdftex} primitive \cs{pdfdest}.
%    \begin{macrocode}
      \makebox[0pt][l]{\hspace*{-#1bp}%
        \pdfdest name {#3} fitr
        width  \fitr@pdftex@view@width\space
        height \fitr@pdftex@view@height\space
        depth  \fitr@pdftex@view@depth\space
      }%
%    \end{macrocode}
% The \textbf{PostScript} code for the \textbf{\textsf{FitR}} destination, for the
% case of \texttt{dvips} and \texttt{dvipsone}.
%    \begin{macrocode}
    \else\literalps@out{%
        [ /Dest/#3/View [ /FitR \FitRbboxB{#1}{#2} ]/DEST pdfmark}%
  \fi\fi
}
%    \end{macrocode}
%     \paragraph*{Form fields.} The \textsf{eforms} package allows for what is
%     called presets. We gather some useful options in one group, and pass them
%     all together. \DescribeMacro{\overlayPresets}\cmd{\overlayPresets} sets
%     some defaults for the push button that surrounding the content.
%     The \DescribeMacro\restoreOverlayPresets\cmd{\restoreOverlayPresets} restores
%     the default definition for \cs{overlayPresets}.
%    \changes{v1.3.1}{2020/07/06}{Added \string\cs{restoreOverlayPresets}}
%    \begin{macrocode}
\newcommand{\overlayPresets}{\H{I}\BG{}\BC{}\S{S}}
\newcommand{\restoreOverlayPresets}{%
  \def\overlayPresets{\H{I}\BG{}\BC{}\S{S}}}
%    \end{macrocode}
%     The \cs{fitr@OverlayJmpBtn} is a \cs{pushButton} that is used internally.
%     It calls document JavaScript \texttt{pbJmpBtnAction()} for a mouse
%     up action.
%    \begin{macrocode}
\def\fitr@OverlayJmpBtn#1#2{%
  \ifx\fitr@allowFX\@empty
    \def\allowFXcode{bAllowFX=\allowFXDefault}\else
    \def\allowFXcode{bAllowFX=\fitr@allowFX}\fi
  \pushButton[\presets{\overlayPresets}\F{-\FPrint}\autoCenter{n}
  \A{\ifFRusedljs\JS{\allowFXcode;\r
    pbJmpBtnAction(event,"\fitr@namedDest","\fitr@namedDest");}\else
    \GoToD(\fitr@namedDest)\fi}]{\fitr@namedDest}{#1}{#2}}
%    \end{macrocode}
%    \begin{macrocode}
\ifHy@colorlinks\def\pbJmpLnkPresets{}\else
  \def\pbJmpLnkPresets{\Color{\@linkcolor}\W{1}}
\fi
\def\fitr@OverlayJmpLnk#1{\setLink[%
  \presets{\pbJmpLnkPresets}
  \A{\ifFRusedljs\JS{% dps
    pbJmpLnkAction("\fitr@namedDest");}\else
    \GoToD(\fitr@namedDest)\fi}]{#1}}
\def\fitr@OverlayRestoreLnk#1{\setLink[%
  \presets{\pbJmpLnkPresets}
  \A{\ifFRusedljs\JS{% dps
    pbRestoreLnkAction("\fitr@namedDest");}\else
    \Named{GoBack}\fi}]{#1}}
%    \end{macrocode}
%
% \section{Document JavaScript}
% The document JavaScript for \textsf{fitr}.
%    \begin{macrocode}
\ifFRusedljs
\begin{insDLJS*}[_fitrLoaded]{fitr}
\begin{newsegment}{JS for the fitr Package}
var _fitrLoaded=true;
var restoreViewState;
var savedRestore=false;
var oSavedRestore=new Object();
var bAllowFX=true;
%    \end{macrocode}
% \leavevmode\IndexOpt{pbJmpBtnAction}\nmpsep{(event,fname,dname)}
% This is the function that the transparent overlay button calls when the
% user clicks on it.
%    \begin{macrocode}
function pbJmpBtnAction(event,fname,dname) {
    if (event.shift) shiftRestoreView(fname,dname);
    else jumpToDest(fname,dname);
}
%    \end{macrocode}
% \leavevmode\IndexOpt{shiftRestoreView}\nmpsep{(fname,dname)} The function to call
% to restore a previously save view.
%    \begin{macrocode}
function shiftRestoreView(fname,dname) {
    var bRestore=restoreView(fname,dname);
%    \end{macrocode}
% Try built-in store view special effects
%    \begin{macrocode}
    if (bAllowFX) try {pbRestoreHook(event,bRestore);}catch(e){}
%    \end{macrocode}
% \leavevmode
% \IndexJS{pbRestoreHookCustom}\nmpsep{(fname,dname)}
% A custom function to perform special effects on restore.
%    \begin{macrocode}
    if (bAllowFX) try {pbRestoreHookCustom(event,bRestore);}catch(e){}
}
%    \end{macrocode}
% \leavevmode
% \IndexJS{jumpToDest}\nmpsep{(fname,dname)}
% When the user clicks on the overlay button, \texttt{pbJmpBtnAction()}
% calls \texttt{jumpToDest}. The function stores the current state before
% jumping.
%    \begin{macrocode}
function jumpToDest(fname,dname) {
    if ( typeof oSavedRestore[fname]=="undefined")
        oSavedRestore[fname]=[false,{}];
    else {
%    \end{macrocode}
% If \texttt{oSavedRestore[fname][0]} is true, that means we have zoomed
% into the expression, but have not zoomed out again. We'll go ahead and zoom out
% by calling \texttt{shiftRestoreView()}, which does just that.
%    \begin{macrocode}
        if (oSavedRestore[fname][0]) {
            shiftRestoreView(fname,dname)
%    \end{macrocode}
% When restoring, we return from this call; we don't want to
% jump to the destination, which is executed later.
%    \begin{macrocode}
            return;
        }
    }
    if (!oSavedRestore[fname][0]){
        oSavedRestore[fname][1]=this.viewState;
        oSavedRestore[fname][0]=true;
    }
%    \end{macrocode}
% Jump to the named destination.
%    \begin{macrocode}
    this.gotoNamedDest(dname);
%    \end{macrocode}
% Try the built-in zoom-in special effects.
%    \begin{macrocode}
    if (bAllowFX) try { pbJmpHook(event); }catch(e){}
%    \end{macrocode}
% \leavevmode\IndexJS{pbJmpHookCustom}\nmpsep{(event)} is a custom function that
% is executed as part of the zoom-in action.
%    \begin{macrocode}
    if (bAllowFX) try { pbJmpHookCustom(event); }catch(e){}
}
%    \end{macrocode}
% \leavevmode\IndexJS{restoreView}\nmpsep{(fname,dname)}
% When the user shift-clicks on the overlay button, \texttt{pbJmpBtnAction()}
% calls \texttt{restoreView}. This function restores the view before the user
% magnified the view.
%    \begin{macrocode}
function restoreView(fname,dname) {
    if ( typeof oSavedRestore[fname]=="undefined")
        oSavedRestore[fname]=[false,{}];
    if ( oSavedRestore[fname][0] ) {
        this.viewState=oSavedRestore[fname][1];
        oSavedRestore[fname][0]=false;
        return true;
    }
    else return false;
}
%    \end{macrocode}
% \leavevmode\IndexJS{pbJmpLnkAction}\nmpsep{(\ameta{dname})}
% is used when the \texttt{link=jmp} key-value pair is
% specified. We jump to the named destination \ameta{dname}.
% A link does not have a name, so we don't use an array of
% stored view state as we do for push buttons. We use a single variable
% for all links.
%    \begin{macrocode}
function pbJmpLnkAction(dname) {
    if (!savedRestore){
        restoreViewState=this.viewState;
        savedRestore=true;
    }
    this.gotoNamedDest(dname);
}
%    \end{macrocode}
% \leavevmode\IndexJS{pbRestoreLnkAction}\nmpsep{(\ameta{dname})}
% is used when the \texttt{link=restore} key-value pair is
% specified. We restore the previously saved view state.
%    \begin{macrocode}
function pbRestoreLnkAction(dname) {
    if (savedRestore){
        this.viewState=restoreViewState;
        savedRestore=false;
    }
}
\end{newsegment}
\ifFRblinkonjmp
%    \end{macrocode}
% This script hooks into the DLJS of fitr to blink the field
% border when the user clicks in it. Length of the blink
% is 1250 milli-seconds.
%    \begin{macrocode}
\begin{newsegment}{Blink border after jump}
%    \end{macrocode}
% \leavevmode\IndexJS{pbJmpHook}\nmpsep{(event)}
% blinks the border of an pb push button just after the jmp to
% focus in on a rectangular region.
%    \begin{macrocode}
function pbJmpHook(event) {
    toggleBC.field=event.target;
    toggleBC.startColor=event.target.strokeColor;
    toggleBC.altColor=%
(color.equal(toggleBC.startColor,color.transparent))?%
color.red:color.transparent;
    oSIJ=app.setInterval("toggleBC();",250);
    oTOJ=app.setTimeOut("app.clearInterval(oSIJ); resetBC();",1250);
}
if (typeof toggleBC != "function" ) {
    function toggleBC() {
        var oField=toggleBC.field;
        oField.strokeColor=%
(color.equal(oField.strokeColor,toggleBC.startColor))?%
toggleBC.altColor:toggleBC.startColor;
    }
    function resetBC() {
        toggleBC.field.strokeColor=toggleBC.startColor;
    }
}
\end{newsegment}
\fi % \ifFRblinkonjmp
\ifFRblinkonrestore
%    \end{macrocode}
% This script hooks into the DLJS of fitr to blink the field
% border when the user clicks in it. Length of the blink
% is 1250 milli-seconds.
%    \begin{macrocode}
\begin{newsegment}{Blink border on restore}
%    \end{macrocode}
% \leavevmode\IndexJS{pbRestoreHook}\nmpsep{(event,bRestore)}
% Supplies special effects on restore: \texttt{event} is the event object
% that called this function; \texttt{bRestore} is a Boolean switch, it is
% true when we are restoring, and false when we are not.
%    \begin{macrocode}
function pbRestoreHook(event,bRestore) {
    if (!bRestore) return;
    toggleBC.field=event.target;
    toggleBC.startColor=event.target.strokeColor;
    toggleBC.altColor=%
(color.equal(toggleBC.startColor,color.transparent))?%
color.red:color.transparent;
    oSIR=app.setInterval("toggleBC();",250);
    oTOR=app.setTimeOut("app.clearInterval(oSIR); resetBC();",1250);
}
if (typeof toggleBC != "function" ) {
    function toggleBC() {
        var oField=toggleBC.field;
        oField.strokeColor=%
(color.equal(oField.strokeColor,toggleBC.startColor))?%
toggleBC.altColor:toggleBC.startColor;
    }
    function resetBC() {
        toggleBC.field.strokeColor=toggleBC.startColor;
    }
}
\end{newsegment}
\fi % \ifFRblinkonrestore
\end{insDLJS*}
\fi % \ifFRusedljs
%    \end{macrocode}
%    \begin{macrocode}
%</package>
%    \end{macrocode}
%\Finale
\endinput