<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">% \iffalse
%&lt;*copyright&gt;
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% digicap-pro package,                                   %%
%% Copyright (C) 2008--2018                               %%
%%   dpstory@acrotex.net                                  %%
%%                                                        %%
%% 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 1.2 of the  %%
%% License, or (at your option) any later version.        %%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%&lt;/copyright&gt;
%&lt;package&gt;\NeedsTeXFormat{LaTeX2e}
%&lt;package&gt;\ProvidesPackage{digicap-pro}
%&lt;package&gt; [2018/05/13 v1.3 Transparent Captions with Photos (dps)]
%&lt;*driver&gt;
\documentclass{ltxdoc}
\usepackage[colorlinks,hyperindex=false]{hyperref}
\pdfstringdefDisableCommands{\let\\\textbackslash}%
\def\CMD#1{\textbackslash{#1}}\def\EXCL{!}
\let\opt\texttt \let\app\textsf \let\pkg\textsf \let\env\texttt
\OnlyDescription  % comment out for implementation details
\EnableCrossrefs
\CodelineIndex
\RecordChanges
\bgroup\ttfamily
\gdef\brpr#1{\char123\relax#1\char125\relax}\egroup
\let\darg\brpr
\let\env\texttt
\let\opt\texttt
\def\visispace{\symbol{32}}
\def\ameta#1{\ensuremath{\langle\textit{\texttt{#1}}\rangle}}
\def\meta#1{\textsl{\texttt{#1}}}
\def\SUB#1{\ensuremath{{}_{\mbox{\scriptsize\ttfamily#1}}}}
\InputIfFileExists{aebdocfmt.def}{\PackageInfo{digicap-pro}{Inputting aebdocfmt.def}}
    {\def\IndexOpt{\DescribeMacro}\def\IndexKey{\DescribeMacro}\let\setupFullwidth\relax
     \PackageInfo{digicap-pro}{aebdocfmt.def cannot be found}}
\begin{document}
  \GetFileInfo{digicap-pro.sty}
  \title{The \texorpdfstring{\protect\pkg{digicap-pro}}{digicap-pro} Package}
  \author{D. P. Story\\
    Email: \texttt{dpstory@acrotex.net}}
  \date{processed \today}
  \maketitle
  \tableofcontents
  \DocInput{digicap-pro.dtx}
\IfFileExists{\jobname.ind}{\newpage\setupFullwidth\par\PrintIndex}{\paragraph*{Index} The index goes here.
    Execute\\[3pt]\null\qquad
    \texttt{makeindex -s gind.ist -o digicap-pro.ind digicap-pro.idx}\\[3pt]
    on the command line and recompile \texttt{digicap-pro.dtx}.}
\IfFileExists{\jobname.gls}{\PrintChanges}{\paragraph*{Change History} The list of changes goes here.
    Execute\\[3pt]\null\qquad
    \texttt{makeindex -s gglo.ist -o digicap-pro.gls digicap-pro.glo}\\[3pt]
    on the command line and recompile \texttt{digicap-pro.dtx}.}
\end{document}
%&lt;/driver&gt;
% \fi
% \MakeShortVerb{|}
% \InputIfFileExists{aebdonotindex.def}{\PackageInfo{digicap-pro}{Inputting aebdonotindex.def}}
%    {\PackageInfo{digicap-pro}{cannot find aebdonotindex.def}}
%    \begin{macrocode}
%&lt;*package&gt;
%    \end{macrocode}
% \section{Introduction}
% This is a package that can create fancy, transparent captions to photos,\footnote
% {Transparent here means having an opacity between 0 and 1.} or any graphics file.
% The captions can be set to be continually visible, or only visible on roll-over. Captions can be
% placed horizontally and vertically with optional arguments. A visible, possibly transparent, border
% can be placed around the caption as well.
%
% \section{Package Options}
%
%  The \IndexOpt{display1}\opt{display1} option is used to create a photo album, a single PDF that
%  contains many photos with captions which are accessible by clicking thumbnails.
%    \begin{macrocode}
\DeclareOption{display1}{\AtEndOfPackage{\dc@input@displayi}}
\def\dc@input@displayi{\InputIfFileExists{digi-p1.def}{}{}}
\ProcessOptions
%    \end{macrocode}
% \section{Code}
%
% Let's get this show on the road!
%
% \subsection{Required Packages}
% The package builds on packages developed as part of \textsf{AeB} or \textsf{AeB~Pro}:
%\begin{itemize}
% \item\textsf{aeb\_pro}: supplies support for layers and JavaScript management of layers
% \item\textsf{graphicxbox}: places a graphic as the background of a box
% \item\textsf{opacity-pro}: creates the transparency effects
% \item\textsf{eforms}: use to create Acrobat form buttons with a roll-over action to make
%   roll-over captions visible or hidden.
%\end{itemize}
%The graphicx package is also used to import digital photos, or other graphics.
%    \begin{macrocode}
\RequirePackage{eforms}
\RequirePackage{graphicx}
\RequirePackage{graphicxbox}
\RequirePackage{opacity-pro}
%    \end{macrocode}
%
% \subsection{\texorpdfstring{\protect\cs{opcolorbox}}{\CMD{opcolorbox}}}
%
% The following are the definitions of the key-value pairs used by \cs{opcolorbox}. A brief
% description of their purpose appears in the section devoted to \cs{opcolorbox}.
%
%    \begin{macrocode}
\def\dc@nocolor{nocolor}
\define@key{opcolorbox}{borderwidth}[2pt]{\def\opcb@borderwidth{#1}}
\define@key{opcolorbox}{fboxsep}[6pt]{\def\opcb@fboxsep{#1}}
\define@key{opcolorbox}{width}[\linewidth]{\def\opcb@width{#1}}
\define@key{opcolorbox}{bordercolor}[black]{\def\opcb@bordercolor{#1}}
\define@key{opcolorbox}{bgcolor}[white]{\def\opcb@bgcolor{#1}}
\define@key{opcolorbox}{borderop}[.5]{\def\opcb@borderop{#1}}
\define@key{opcolorbox}{bordertextop}[1]{\def\opcb@bordertextop{#1}}
\define@key{opcolorbox}{bgop}[.5]{\def\opcb@bgop{#1}}
\define@key{opcolorbox}{textop}[1]{\def\opcb@textop{#1}}
\define@key{opcolorbox}{borderblend}[Normal]{%
    \def\opcb@borderblendmode{#1}}
\define@key{opcolorbox}{bgblend}[Normal]{\def\opcb@bgblendmode{#1}}
\setkeys{opcolorbox}{borderwidth,fboxsep,width,bordercolor,bgcolor,%
    bordertextop,borderop,bgop,textop,borderblend,bgblend}
%    \end{macrocode}
%    \begin{macro}{\opcolorbox}
%
% A general purpose color box that creates two color boxes, a larger one with a
% smaller one centered vertically and horizontally inside the larger one. Transparent
% options allow separate control over the opacity settings of the larger and smaller
% rectangle as well as the text that is written within the smaller rectangle.
%
%\paragraph*{Optional key-values for the first parameter}
%\begin{description}
%   \item[\texttt{borderwidth}:] The border width. The default is \texttt{2pt}
%   \item[\texttt{fboxsep}:] The space between the border and the text, the default is \texttt{6pt}
%   \item[\texttt{width:}] The width of \cs{parbox}, the default is \cs{linewidth}
%   \item[\texttt{bordercolor}:] A named color of border, the default is \texttt{black}. A special value
%   of \texttt{nocolor} is recognized, in that case, no color is applied.
%   \item[\texttt{bgcolor:}] A named color of background, the default is \texttt{white}. A special value
%   of \texttt{nocolor} is recognized, in that case, no color is applied.
%   \item[\texttt{borderop:}] A number type, the opacity for border $0 \le \mbox{number} \le 1$, the default is~$.5$
%   \item[\texttt{bgop:}] A number type, the opacity for background $0 \le \mbox{number} \le 1$, the default is~$.5$
%   \item[\texttt{textop:}] A number type, the opacity for text $0 \le \mbox{number} \le 1$, the default is~$1$
%   \item[\texttt{borderblend:}] The blend mode for the border, the default is \texttt{Normal}
%   \item[\texttt{bgblend:}] The blend mode for the background, the default is \texttt{Normal}
%\end{description}
%
%\paragraph*{Second parameter, required.} The text that goes within the box.
%
%    \begin{macrocode}
\def\dc@mark{[\space}%]
\newcommand{\opcolorbox}[2][]{\begingroup
  \edef\dc@tmp@exp{\noexpand\setkeys{opcolorbox}{#1}}\dc@tmp@exp
  \ifx\opcb@bgcolor\dc@nocolor\let\opcb@set@bgcolor\mbox
  \else\def\opcb@set@bgcolor{\colorbox{\opcb@bgcolor}}\fi
  \ifx\opcb@bordercolor\dc@nocolor\let\opcb@set@bordercolor\mbox
  \else\def\opcb@set@bordercolor{\colorbox{\opcb@bordercolor}}\fi
  \setlength{\fboxsep}{\opcb@borderwidth}\setlength{\fboxrule}{0pt}%
  \begin{settransparency}[\opcb@borderblendmode]{\opcb@bordertextop}%
    {\opcb@borderop}%
    \opcb@set@bordercolor{\parbox[c]{\opcb@width}{%
    \setlength{\fboxsep}{\opcb@fboxsep}\setlength{\fboxrule}{0pt}%
    \begin{settransparency}[\opcb@bgblendmode]{\opcb@textop}%
      {\opcb@bgop}%
      \opcb@set@bgcolor{\parbox[c]{\linewidth-2\fboxsep}{%
%    \end{macrocode}
% for dvips, CA is not recognized since dvips does not stroke backgrounds,
% so we insert another layer of transparency, with ca=CA=\cs{opcb@textop}
%    \begin{macrocode}
      \begin{settransparency}{\opcb@textop}{\opcb@textop}%
        #2%
      \end{settransparency}%
      }}%
    \end{settransparency}}}%
  \end{settransparency}%
    \endgroup
}
%    \end{macrocode}
%    \end{macro}
%
% \subsection{\texorpdfstring{\protect\cs{digiCap} and \protect\cs{digiCap*}}
%   {\CMD{digiCap} and \CMD{digiCap*}}}
%
% The \cs{digiCap} command is defined in this section; there is an \texttt*
% option that changes the caption into a rollover. Before we get started, we define
% several commands that support some of the options for this command.
%
% The \cs{dc@vCaptionPlacement} command accomplishes two things: It records the document author's choice
% for vertical placement of the caption (saving it in \cs{aeb@captionPlacement}),
% and calculates the amount of vertical displacement needed to overlay
% the rollover form field correctly over the picture. Possible values for \texttt{\#1}
% and \texttt{b}, \texttt{c}, and \texttt{t}. The default is \texttt{b}.
% This command is called when the author sets \texttt{vcaption},
% a key belonging to the \texttt{dc@commands} family. Defined below.
%    \begin{macrocode}
\def\dc@vCaptionPlacement#1{\def\dc@captionPlacement{#1}%
    \def\dc@@captionPlacement{0pt}%
    \if\dc@captionPlacement c%
        \def\dc@@captionPlacement{-\dc@graphicHalfHeight+3pt}\else
    \if\dc@captionPlacement t%
        \def\dc@@captionPlacement{-\dc@graphicHeight}%
    \else
        \def\dc@captionPlacement{b}%
        \def\dc@@captionPlacement{0pt}%
    \fi\fi
}
\dc@vCaptionPlacement{b}
%    \end{macrocode}
% We set the horizontal placement of the caption, possible values are \texttt{l}, \texttt{c}, and \texttt{r}.
% The default is \texttt{c}. This command is called when the author sets \texttt{hcaption},
% a key belonging to the \texttt{dc@commands} family. Defined below.
%    \begin{macrocode}
\def\dc@hCaptionPlacement#1{\def\dc@argi{#1}%
    \if\dc@argi l\def\dc@Hplacement{\relax}\else
        \if\dc@argi c\def\dc@Hplacement{\hfil}\else
            \if\dc@argi r\def\dc@Hplacement{\hfill}\else
                \def\dc@Hplacement{\relax}\fi\fi\fi
}
\dc@hCaptionPlacement{c}
%    \end{macrocode}
%    \begin{macrocode}
\def\dc@calc@adj@width#1{{%
    \edef\dc@tmp@exp{\noexpand\setkeys{opcolorbox}{#1}}\dc@tmp@exp
    \setlength{\linewidth}{\dc@graphicWidth-2\fboxsep}%
    \setlength{\dimen@}{\opcb@width}%
    \setlength{\dimen@ii}{\opcb@borderwidth}%
    \setlength{\dimen@}{\dimen@-2\dimen@ii}%
    \xdef\dc@adj@width{\the\dimen@}%
}}
%    \end{macrocode}
% This is the command that inserts the caption
%\begin{verbatim}
%   #1=path to graphic
%   #2=box content (#3-#5 are included in the box content)
%   #3=KVPairs of \opcolorbox
%   #4=content of \opcolorbox
%   #5=either empty or \eBld, if layers used
%\end{verbatim}
%    \begin{macrocode}
\long\def\dc@insert@graphicx@opcolor@boxes#1#2#3#4#5{%
    \graphicxbox{#1}{#2\parbox[\dc@captionPlacement]%
        [\dc@graphicHeight-2\fboxsep]{\dc@graphicWidth-2\fboxsep}%
        {\vskip0pt\dc@Hplacement\opcolorbox[#3,width=\dc@adj@width]%
        {#4}\par\kern0pt}#5}%
}
%    \end{macrocode}
%    \begin{macro}{\graphicHeight}
%    \begin{macro}{\graphicWidth}
% These two commands may be used within the \texttt{&lt;caption&gt;} argument
% of the command \cs{digiCap}. \cs{graphicHeight} is used
% to set the height of a \texttt{minipage} of \cs{parbox} for a vertically oriented caption.
% An example appears in the demo file.
%    \begin{macrocode}
\def\graphicHeight{\dc@graphicHeight-2\fboxsep-%
    \dc@outerboxsep-\dc@outerboxsep-\opcb@borderwidth-\opcb@borderwidth}
\def\graphicWidth{\dc@graphicWidth-2\fboxsep-%
    \dc@outerboxsep-\dc@outerboxsep-\opcb@borderwidth-\opcb@borderwidth}
%    \end{macrocode}
%    \end{macro}
%    \end{macro}
%    \begin{macro}{\digiCap}
% A command that places a picture as background of a box, and places a, possibly, transparent
% caption, optionally, with a border. The syntax is\dots
%\begin{verbatim}
% \digiCap[&lt;dc@commands_kvps&gt;]
%       {&lt;file&gt;}[&lt;opcolorbox_fam_kvps&gt;]{&lt;caption&gt;}
%\end{verbatim}
% or
%\begin{verbatim}
% \digiCap*[&lt;dc@commands_kvps&gt;]
%       {&lt;file&gt;}[&lt;opcolorbox_fam_kvps&gt;]{&lt;caption&gt;}
%\end{verbatim}
% If the optional \texttt{*} appears, then \cs{dc@digiCapRollover} is called, otherwise,
% \cs{dc@digiCap}.
%
% The \texttt{dc@commands} \texttt{xkeyval} family is defined below.
%\paragraph*{Optional key-values for the first parameter.} This set of parameters
% control the placement of the caption on top of the background picture. There is
% also a parameter to set the \cs{includegraphics} options, and the underlying
% form field name, in the case of a rollover.
%\begin{description}
%\item[\texttt{outerboxsep}:] The space the surrounds the boundary of the caption, the default is \texttt{3pt}
%\item[\texttt{vcaption}:] The vertical placement of the caption on the background graphic, possible
%   values are \texttt{b}, \texttt{c}, and \texttt{t}. The default is \texttt{b}.
%\item[\texttt{hcaption}:] The horizontal placement of the caption on the background graphic, possible
%   values are \texttt{l}, \texttt{c}, and \texttt{r}. The default is \texttt{c}.
%\item[\texttt{inclgraphicx}:] The value of this key is a list of key-value pairs that are passed on to the
%  underlying \cs{includegraphics} command.
%\item[\texttt{rollovername}:] The basename of the push button form field that is used for a rollover effect.
%   This command is used only with \cs{digiCap*}, ignored otherwise. For the \cs{digiCap*}
%   command, this key is optional, if not present, this package supplies a name.
%\end{description}
%\paragraph*{Second parameter, required.} The second parameter \texttt{&lt;file&gt;} is the path to the graphic to be
% use as a background to this box.
%\paragraph*{Optional key-values for the third parameter.} The options for the underlying \cs{opcolorbox}. See above
% for a listing and description.
%%\paragraph*{Fourth parameter, required.} The content of the caption.
%    \begin{macrocode}
\define@key{dc@commands}{outerboxsep}[3pt]{\def\dc@outerboxsep{#1}}
\define@key{dc@commands}{vcaption}[b]{\dc@vCaptionPlacement{#1}}
\define@key{dc@commands}{hcaption}[c]{\dc@hCaptionPlacement{#1}}
\define@key{dc@commands}{inclgraphicx}[]{%
    \def\dc@inclgraphicx{#1\dc@incgfx@addkeys}}
\let\dc@incgfx@addkeys\@empty
\define@key{dc@commands}{rollovername}[]{{%
    \gdef\dc@rollovername{#1}%
    \ifx\dc@rollovername\@empty
        {\count0=\dc@rollover@cnt\advance\count0by1\relax
        \xdef\dc@rollover@cnt{\the\count0}%
        \xdef\dc@rollovername{Cnt\dc@rollover@cnt}}%
    \fi
}}
\let\dc@rollovername\@empty
\def\dc@rollover@cnt{0}%
\setkeys{dc@commands}{outerboxsep,vcaption,hcaption,inclgraphicx}
%    \end{macrocode}
%    \begin{macrocode}
\newcommand{\digiCap}{\@ifstar{\dc@digiCapRollover}
    {\dc@digiCap}}
%    \end{macrocode}
% \paragraph*{\cs{dc@digiCap}} This creates a digital photo with caption, no rollover.
%    \begin{macrocode}
\newcommand{\dc@digiCap}[2][]{\begingroup
    \edef\dc@tmp@exp{\noexpand\setkeys{dc@commands}{#1}}\dc@tmp@exp
    \def\dc@filename{#2}\setlength{\fboxsep}{\dc@outerboxsep}%
    \dc@@digiCap
}
\newcommand{\dc@@digiCap}[2][]{%
    \edef\dc@tmp@exp{\noexpand\setkeys{Gin}{\dc@inclgraphicx}}%
    \dc@tmp@exp\edef\dc@tmp@exp{\setbox0=
        \hbox{\noexpand\includegraphics[draft,\dc@inclgraphicx]%
        {\dc@filename}}}\dc@tmp@exp\dimen@=\dp0 \advance\dimen@\ht0
    \edef\dc@graphicHeight{\the\dimen@}%
    \edef\dc@graphicWidth{\the\wd0}%
    \dc@calc@adj@width{#1}\parbox{\dc@graphicWidth}{%
    \dc@insert@graphicx@opcolor@boxes{\dc@filename}{}{#1}{#2}{}}%
\endgroup}
%    \end{macrocode}
%    \end{macro}
% \paragraph*{\cs{dc@digiCap*}} Same as \cs{dc@digiCap}, but the caption is placed in a layer and a rollover
% effect is use to make the caption appear. The syntax is\dots
%    \begin{macrocode}
\newcommand{\dc@digiCapRollover}[2][]{\begingroup
    \edef\dc@tmp@exp{\noexpand\setkeys{dc@commands}{#1}}%
    \dc@tmp@exp\def\dc@filename{#2}%
    \setlength{\fboxsep}{\dc@outerboxsep}%
    \ifx\dc@rollovername\@empty\setkeys{dc@commands}{rollovername}\fi
    \dc@@digiCapRollover
}
\newcommand{\dc@@digiCapRollover}[2][]{%
    \edef\dc@tmp@exp{\noexpand\setkeys{Gin}{\dc@inclgraphicx}}%
    \dc@tmp@exp\edef\dc@tmp@exp{\setbox0=\hbox{%
        \noexpand\includegraphics[draft,\dc@inclgraphicx]%
        {\dc@filename}}}\dc@tmp@exp\dimen@=\dp0\advance\dimen@\ht0
    \edef\dc@graphicHeight{\the\dimen@}\dimen@=.5\dimen@
    \edef\dc@graphicHalfHeight{\the\dimen@}%
    \edef\dc@graphicWidth{\the\wd0}%
    \dc@calc@adj@width{#1}\parbox{\dc@graphicWidth}{%
        \raisebox{\dc@@captionPlacement}[0pt][0pt]{\rlap
        {\pushButton[\presets{\digiCapsPresets{\dc@rollovername}}%
         \presets{\hiddenPresets}]{dcRollover.\dc@rollovername}%
         {\dc@graphicWidth}{\dc@graphicHeight}}}%
         \dc@insert@graphicx@opcolor@boxes{\dc@filename}%
        {\xBld{\dc@rollovername}}{#1}{#2}{\eBld}%
    }\global\let\dc@rollovername\@empty%
\endgroup}
%    \end{macrocode}
% This is a listing of options to be used by the push button that
% supplies the rollover effect.
%    \begin{macrocode}
\def\digiCapsPresets#1{\W0\BG{}\BC{}\H{N}\autoCenter{n}% rollover mod
    \AA{\AAMouseEnter{\JS{toggleSetThisLayer("#1",true);}}%
    \AAMouseExit{\JS{toggleSetThisLayer("#1",false);}}}}
\def\hiddenPresets{}
%    \end{macrocode}
%    \begin{macrocode}
%&lt;/package&gt;
%    \end{macrocode}
%    \begin{macrocode}
%&lt;*digidisplay1&gt;
%    \end{macrocode}
%
% \subsection{A Layout for Digital Display (Photo album)}
%
% This segment of code provides for a layout to display digital images. Thumbnails of the
% images are lined up in rows or columns. When the user rolls over a thumb, a large version
% of that photo appears in the display area.  The photos can optionally contain a short caption,
% and a longer caption. This latter caption appears on a transparent background on top of the photo
% (|\digiCap| is used here).
%
% \subsubsection{Embedding Images/Creating Thumb Appearances}
%
% Embed each image using |\embedEPS|, then create other images of that digital
% in normal, rollover and down appearances. These are used
% for the form field thumbnails.
%
%    \begin{macro}{\PicsThisDoc}
% This command is executed in the preamble of the document. The one argument is a
% comma delimited list of four parameters:
%\begin{verbatim}
%   \PicsThisDoc
%   {%
%       {&lt;embed_name&gt;}{&lt;graphic_path&gt;}{&lt;short_caption&gt;}{&lt;long_caption&gt;},
%       {&lt;embed_name&gt;}{&lt;graphic_path&gt;}{&lt;short_caption&gt;}{&lt;long_caption&gt;},
%       ...
%       {&lt;embed_name&gt;}{&lt;graphic_path&gt;}{&lt;short_caption&gt;}{&lt;long_caption&gt;}
%   }
%\end{verbatim}
% We pass each set of four arguments on to \cs{dc@setPicsAndCaptions} for processing.
%    \begin{macrocode}
\newcommand{\PicsThisDoc}[1]{%
    \@for\@args:=#1\do{\expandafter\dc@setPicsAndCaptions\@args}%
}
%    \end{macrocode}
%    \end{macro}
% This command takes the four arguments passed to it from \cs{PicsThisDoc}, and passes the
% required args to the commands \cs{dc@embedEPSCreateAppearances} and to \cs{dc@defTheseCaptions}.
%    \begin{macrocode}
\def\dc@setPicsAndCaptions#1#2#3#4{%
    \dc@embedEPSCreateAppearances{#1}{#2}%
    \dc@defTheseCaptions{#1}{#3}{#4}%
}
%    \end{macrocode}
% This command embeds the graphic file \texttt{\#2}, names that file as \texttt{\#1}. The name
% \texttt{\#1} is later used to show the figure. The \textsf{grahicxsp} package is used here.
% This command also builds images used in the appearance states of the thumbnail images. The
% appearance states can be redefined, as desired.
%    \begin{macro}{\setThumbAppearances}
% Set the appearances of the thumbnail images. There are three appearances: normal, rollover and
% push. The settings for these parameters are use in the command \cs{dc@embedEPSCreateAppearances}.
%
% There is one optional argument, the value of this optional argument is the name of one of the
% photos; in this case, the second argument is used only for that picture. This way, you can
% change the appearance of the thumbs. Normally, they would all look the same.
%    \begin{macrocode}
\newcommand{\setThumbAppearances}[2][]{%
    \def\dc@argi{#1}\ifx\dc@argi\@empty\def\dc@thumbApprs{#2}%
    \setkeys{dc@ro@appr}{#2}\else
    \expandafter\def\csname dc@thumbApprs@#1\endcsname{#2}\fi
}
\define@key{dc@ro@appr}{normalop}[.5]{\def\dc@ro@appr@normalopacity{#1}}
\define@key{dc@ro@appr}{rolloverop}[1]%
    {\def\dc@ro@appr@rolloveropacity{#1}}
\define@key{dc@ro@appr}{downop}[.3]%
    {\def\dc@ro@appr@downopacity{#1}}
\define@key{dc@ro@appr}{boundarywidth}[30]%
    {\def\dc@ro@appr@boundarywidth{#1}}
\define@key{dc@ro@appr}{rgbcolor}[]{%
  \def\dc@ro@appr@rgbcolor{#1}\ifx\dc@ro@appr@rgbcolor\@empty
  \else
    \expandafter\ef@isitnamed\dc@ro@appr@rgbcolor\ef@nil
    \ifx\ef@latex@color\ef@y\expandafter
      \HyColor@XZeroOneThreeFour
        \expandafter{\dc@ro@appr@rgbcolor}{\dc@ro@appr@rgbcolor}{}{}%
      \edef\dc@ro@appr@rgbcolor{\dc@ro@appr@rgbcolor}\fi
\fi}
\let\dc@ro@appr@rgbcolor\@empty
%    {\def\dc@ro@appr@rgbcolor{#1}}
\define@key{dc@ro@appr}{cmykcolor}[0 0 1 0]{%
  \def\dc@ro@appr@cmykcolor{#1}\ifx\dc@ro@appr@cmykcolor\@empty
  \else
    \expandafter\ef@isitnamed\dc@ro@appr@cmykcolor\ef@nil
    \ifx\ef@latex@color\ef@y\expandafter
      \HyColor@XZeroOneThreeFour
        \expandafter{\dc@ro@appr@cmykcolor}{\dc@ro@appr@cmykcolor}{}{}%
      \edef\dc@ro@appr@cmykcolor{\dc@ro@appr@cmykcolor}\fi
\fi}
\def\dc@ro@appr@cmykcolor{0 0 1 0}
%    {\def\dc@ro@appr@cmykcolor{#1}}
%    \end{macrocode}
% Set the default values for these key-value pairs.
%    \begin{macrocode}
\setThumbAppearances{normalop,rolloverop,downop,boundarywidth,%
    rgbcolor,cmykcolor}
%    \end{macrocode}
%    \end{macro}
% This command embeds the graphic file \texttt{\#2}, names that file as \texttt{\#1}. The name
% \texttt{\#1} is later used to show the figure. The \textsf{grahicxsp} package is used here.
% This command also builds images used in the appearance states of the thumbnail images. The
% appearance states can be redefined, as desired.
%    \begin{macrocode}
\def\dc@embedEPSCreateAppearances#1#2{%
    \embedEPS[transparencyGroup]{#1}{#2}%
    \@ifundefined{dc@thumbApprs@#1}{\edef\dc@tmp@exp%
        {\noexpand\setkeys{dc@ro@appr}{\dc@thumbApprs}}}%
        {\edef\dc@tmp@exp{\noexpand\setkeys{dc@ro@appr}%
        {\csname dc@thumbApprs@#1\endcsname}}}\dc@tmp@exp
    \begin{createImage}{\bboxOf{#1}}{n#1}
        gsave
        \dc@mark/ca \dc@ro@appr@normalopacity
          /SetTransparency pdfmark
        \urxOf{#1} .1 mul \uryOf{#1} .1 mul moveto
        currentpoint translate
       .8  .8  scale
        \dc@mark{#1} /SP pdfmark
        grestore
    \end{createImage}
    \begin{createImage}{\bboxOf{#1}}{r#1}
        \dc@mark/ca \dc@ro@appr@rolloveropacity
          /CA \dc@ro@appr@rolloveropacity
          /SetTransparency pdfmark
        \dc@mark{#1} /SP pdfmark
        \dc@ro@appr@boundarywidth\space setlinewidth
        \ifx\dc@ro@appr@rgbcolor\@empty
        \dc@ro@appr@cmykcolor\space setcmykcolor\else
        \dc@ro@appr@rgbcolor\space setrgbcolor\fi\space
        currentlinewidth 2 div dup
        \urxOf{#1} currentlinewidth sub \uryOf{#1} currentlinewidth sub
        rectstroke
    \end{createImage}
    \begin{createImage}{\bboxOf{#1}}{d#1}
        \dc@mark/ca \dc@ro@appr@downopacity
          /CA \dc@ro@appr@downopacity/SetTransparency pdfmark
        \dc@mark{#1} /SP pdfmark
        \dc@ro@appr@boundarywidth\space setlinewidth
        \ifx\dc@ro@appr@rgbcolor\@empty
        \dc@ro@appr@cmykcolor\space setcmykcolor\else
        \dc@ro@appr@rgbcolor\space setrgbcolor\fi\space
        currentlinewidth 2 div dup
        \urxOf{#1} currentlinewidth sub \uryOf{#1} currentlinewidth sub
        rectstroke
    \end{createImage}
}
%    \end{macrocode}
% This command takes that short and long captions and saves them in a text macro
% under the name \texttt{\#1Caption} and \texttt{\#1Text}, where \texttt{\#1} is
% the graphic name.
%    \begin{macrocode}
\def\dc@defTheseCaptions#1#2#3{%
    \expandafter\gdef\csname #1Caption\endcsname{#2}%
    \expandafter\gdef\csname #1Text\endcsname{#3}%
}
%    \end{macrocode}
%
% \subsubsection{Placing the elements on the page}
%
% This section of the code is devoted to defining the commands to insert the
% various elements on the page: the photos, the captions, and the thumbs.
%    \begin{macro}{\presentationOrder}
% A command to create a text macro. The argument is a comma delimited list
% of photo names.
%    \begin{macrocode}
\newcommand{\presentationOrder}[1]{\def\dc@presentationOrder{#1}}
%    \end{macrocode}
%    \end{macro}
%    \begin{macro}{\dcFirstOpt}
%    \begin{macro}{\dcSecondOpt}
% These two commands are used to pass optional arguments to \cs{digiCap}.
% \cs{}
% with various required arguments). These controls for the appearance, transparancy, and positioning of the long caption box.
% These \cs{dcFirstOpt} and \cs{dcSecondOpt} are passed as the first optional parameter and third
% parameters of the \cs{digiCap} command.
%    \begin{macrocode}
\newcommand{\dcFirstOpt}[2][]{%
    \def\dc@argi{#1}\ifx\dc@argi\@empty\def\dc@icontrol{#2}\else
    \expandafter\def\csname dc@icontrol@#1\endcsname{#2}\fi}
\newcommand{\dcSecondOpt}[2][]{%
    \def\dc@argi{#1}\ifx\dc@argi\@empty\def\dc@iicontrol{#2}\else
    \expandafter\def\csname dc@iicontrol@#1\endcsname{#2}\fi}
%    \end{macrocode}
% The following are the default settings for these controls. The values for the
% macros \cs{digiDSWidth} and \cs{digiDSHeight} are defined in \cs{digiDisplaySpace}.
%    \begin{macrocode}
\dcFirstOpt{vcaption=b,hcaption=c,outerboxsep=0pt}
\dcSecondOpt{borderwidth=0bp,fboxsep=10bp,bordercolor=nocolor,bgop=.7}
%    \end{macrocode}
%    \end{macro}
%    \end{macro}
%    \begin{macro}{\useRollovers}
%    \begin{macro}{\noRollovers}
% Execute these commands to create rollovers for the long captions. The default
% is to use no rollovers.
%    \begin{macrocode}
\def\useRollovers{\def\dc@use@Rollover{*}%
    \def\hiddenPresets{\F{\FHidden}}}
\def\noRollovers{\let\dc@use@Rollover\@empty
    \def\hiddenPresets{}}
\let\dc@use@Rollover\@empty
%    \end{macrocode}
% Don't ask what this is.
%    \begin{macrocode}
\def\dc@fudge{\llap{.\hskip20in}}
%    \end{macrocode}
%    \end{macro}
%    \end{macro}
%    \begin{macro}{\longCapFmt}
% Use this command to apply a global format to the long captions. For example,
% |\longCapFmt{\bfseries\scriptsize}|. The default setting does nothing.
%    \begin{macrocode}
\newcommand{\longCapFmt}[1]{%
    \def\dc@longCapFmt{#1}}
\longCapFmt{}
%    \end{macrocode}
%    \end{macro}
%    \begin{macro}{\dc@showPic}
% This is the command that places the large digital image in the display area.
%    \begin{macrocode}
\def\dc@showPic#1{\leavevmode\xBld{#1}\dc@fudge
    \vbox to0pt{\vss\hbox to0pt{\hss
%    \end{macrocode}
% The \texttt{inclgraphicx} of the \texttt{dc@commands} family has a secret
% macro named \cs{gc@incgfx@addkeys} inserted in its definition. By default, \cs{gc@incgfx@addkeys}
% is \cs{let} equal to \cs{@empty}. We change that definition
% here to include the \texttt{name} of the graphic, so the document author does not have
% to bother. We also scale the picture to fit in the display space.
%    \begin{macrocode}
    \def\dc@incgfx@addkeys{width=\digiDSWidth,%
        height=\digiDSHeight,keepaspectratio,name=#1}%
%    \end{macrocode}
% If there is a custom control for this image, we swap off the default one
% with the custom one.
%    \begin{macrocode}
    \@ifundefined{dc@icontrol@#1}{}{\expandafter\let\expandafter
    \dc@icontrol\expandafter=\csname dc@icontrol@#1\endcsname}%
%    \end{macrocode}
% If there is a custom control for this image for the second optional argument, we swap off the default one
% with the custom one.
%    \begin{macrocode}
    \@ifundefined{dc@iicontrol@#1}{}{\expandafter\let\expandafter
    \dc@iicontrol\expandafter=\csname dc@iicontrol@#1\endcsname}{}%
%    \end{macrocode}
% Finally, we are ready to execute the appropriate graphic caption command, with or without rollover.
%    \begin{macrocode}
    \expandafter\digiCap\dc@use@Rollover%
%    \end{macrocode}
% After determining which control for the first optional argument
% we insert |rollovername=ro#1| to give the rollover a pre-determined
% name that we know and can use to give the rollover effect for the
% long caption, if requested. The rollover key is ignored, if
% \cs{digiCap*} is not used.
%    \begin{macrocode}
        [\dc@icontrol,rollovername=ro#1]{\null}[\dc@iicontrol]%
        {\dc@longCapFmt\csname#1Text\endcsname}%
\hss}\vss}\eBld}
%    \end{macrocode}
%    \end{macro}
%    \begin{macro}{\digiDisplaySpace}
% A simple command to define a space to place the digital images into. The images
% are centered both horizontally and vertically in the display space.
% The first parameter is the height of the digital display, the second is the width.
% These dimensions are recorded in the macros \cs{digiDSHeight} and \cs{digiDSWidth}
% This command can be redefined, but the developer needs to define these two macros.
%    \begin{macrocode}
\newcommand{\digiDisplaySpace}[2]{%
    \def\digiDSHeight{#1}\def\digiDSWidth{#2}%
    \parbox[c][#1]{#2}{\centering\insertPhotos}%
}
%    \end{macrocode}
%    \end{macro}
%    \begin{macro}{\insertPhotos}
% This is a user-interface to inserting the photos into the display area.
% Used by \cs{digiDisplaySpace}.
%    \begin{macrocode}
\newcommand{\insertPhotos}{\edef\dc@tmp@exp{\noexpand\@for
    \noexpand\@args:=\dc@presentationOrder}\dc@tmp@exp\do{%
        \edef\dc@tmp@exp{\noexpand\dc@showPic{\@args}}\dc@tmp@exp}%
}
%    \end{macrocode}
%    \end{macro}
%    \begin{macro}{\shortCapFmt}
% User-interface to formatting the short captions.
%    \begin{macrocode}
\newcommand{\shortCapFmt}[1]{%
    \def\dc@showCaption##1##2{\makebox[0pt][c]{\xBld{##1}#1##2\eBld}}}
%    \end{macrocode}
% The default caption formatting is given below.
%    \begin{macrocode}
\shortCapFmt{\sffamily\bfseries\color{blue}}
%    \end{macrocode}
%    \end{macro}
%    \begin{macro}{\insertCaptions}
% The main command for inserting captions, these can be placed above or below the display area.
%    \begin{macrocode}
\newcommand{\insertCaptions}{\dc@fudge\edef\dc@tmp@exp{\noexpand\@for
    \noexpand\@args:=\dc@presentationOrder}\dc@tmp@exp\do{%
        \edef\dc@tmp@exp{\noexpand\dc@showCaption{\@args}%
            {\noexpand\csname\@args Caption\noexpand\endcsname}}%
            \dc@tmp@exp}%
}
%    \end{macrocode}
%    \end{macro}
%    \begin{macro}{\insertThumbs}
%    \begin{macro}{\setWidthOfThumbs}
%    \begin{macro}{\addvspacetorows}
% The command to insert the thumbs in a tabular environment. The
% first argument is the number of rows, and second argument is the
% number of columns.
%    \begin{macrocode}
\newcommand{\setWidthOfThumbs}[1]{{%
    \setlength{\dimen0}{#1}%
    \xdef\dc@thumbwidth{\the\dimen0}%
}}
\setWidthOfThumbs{0pt}
\newcommand{\addvspacetorows}[1]{\def\dc@addvspacetorows{#1}}
\addvspacetorows{1ex}%
\def\eq@tabSep{&amp;}
\def\insertThumbs#1#2{\begingroup
    \count0=0\relax\count2=0\relax
    \def\dc@maxRows{#1}\def\dc@maxCols{#2}%
    \setlength{\dimen0}{\dc@thumbwidth}\ifdim\dimen0=0pt
    \setWidthOfThumbs{\linewidth/(\dc@maxCols)-\tabcolsep*2}\fi
    \edef\dc@thisArg{\dc@presentationOrder,}%
    \def\dc@insThumb@cr{\\[\dc@addvspacetorows]}%
    \kern0pt\begin{tabular}{*{#2}{m{\dc@thumbwidth}}}%
    \@whilenum\count0&lt;#1\do{%
        \@whilenum\count2&lt;#2\do{%
            \ifx\dc@thisArg\@empty
                \global\let\dc@insThumb@cr\relax
                \global\count0=\dc@maxRows
                \global\count2=\dc@maxCols\else
                \expandafter\dc@getNextArg\dc@thisArg\@nil
                \global\advance\count2by1\relax
                \ifx\dc@testArg\@empty
                \else\ifnum\count2=\dc@maxCols
                \else\eq@tabSep\fi\fi\fi
        }\dc@insThumb@cr
        \global\count2=0\relax\global\advance\count0by1\relax
    }%
\end{tabular}%
\endgroup}
\def\dc@getNextArg#1,#2\@nil{\dc@digi@thumbs{#1}\gdef\dc@thisArg{#2}}
%    \end{macrocode}
%    \end{macro}
%    \end{macro}
%    \end{macro}
%
% \subsubsection{Form fields and JavaScript}
%
% We define a push button with a normal, rollover and push appearance. The JavaScript actions
% makes the picture in the display space visible, and making the previous picture hidden.
%
% The command, \cs{dc@digi@thumbs}, creates a push button with normal, down and rollover appearances.
% The JavaScript actions is to show execute the function \texttt{showThisPicture()},
% which is defined as document JavaScript, below. The function manages the hiding and
% showing of layers, and if the \cs{useRollovers} is in effect, manages the rollover field
% created by \cs{digiCap*} command.
%    \begin{macrocode}
\def\normalAppr#1{n#1}
\def\downAppr#1{d#1}
\def\rolloverAppr#1{r#1}
\def\dc@digi@thumbs#1{\hfil%
{\dimen0=\widthOf{#1}bp\relax\dimen2=\heightOf{#1}bp\relax
 \ifdim\dimen0&lt;\dimen2\relax
    \edef\dc@argi{\string!}\edef\dc@argii{\dc@thumbwidth}\else
    \edef\dc@argi{\dc@thumbwidth}\edef\dc@argii{\string!}\fi
    \xdef\dc@tmp@exp{\noexpand\resizebox{\dc@argi}{\dc@argii}}%
}\dc@tmp@exp{\pushButton[%
    \autoCenter{n}\BC{}\BG{}\S{S}\W0
    \A{\JS{%
        showThisPicture("#1");\r
        lastPicture="#1";\r
        this.dirty=false;
    }}\I{\normalAppr{#1}}\RI{\downAppr{#1}}\IX{\rolloverAppr{#1}}
    \TP{1}\FB{true}]{pb#1}{\widthOf{#1}bp}{\heightOf{#1}bp}}}
%    \end{macrocode}
% The JavaScript function manages the hiding and showing of layers,
% and if the \cs{useRollovers} is in effect, manages the rollover
% field. The argument \texttt{name} is the name of the graph to be
% shown. The name one to be hidden is saved as the value of
% \texttt{lastPicture}.
%    \begin{macrocode}
\begin{insDLJS}[showThisPicture]{digidjs1}{Show This Picture}
var lastPicture="";
function showThisPicture(name) {
    if (lastPicture != "") {
        var f = this.getField("dcRollover.ro"+lastPicture);
        if ( f != null ) f.display=display.hidden;
        toggleSetThisLayer(lastPicture,false);
    }
    var f = this.getField("dcRollover.ro"+name);
    if ( f != null ) f.display=display.visible;
    toggleSetThisLayer(name);
}
try { app.runtimeHighlight=false; app.focusRect=false; } catch(e) {};
\end{insDLJS}
%&lt;/digidisplay1&gt;
%    \end{macrocode}
%  \Finale
\endinput
%    \begin{macrocode}
%&lt;*package&gt;
%&lt;/package&gt;
%    \end{macrocode}
</pre></body></html>