% Document style option "doublespace"
% -- usage:  \documentstyle[...,doublespace,...]{...}
%
% WARNING!
%    This option is provided for those who are COMPELLED by powers
%    beyond their control to double-space their documents. Known
%    powers of this kind include copy-editors and dissertation
%    rule-makers in some universities. Double spacing is one of the
%    best ways to ruin the appearance of a document and to render
%    it difficult to read (in this respect it is equalled only by
%    adding too many characters on a line).
%
% This style option produces a double-spaced document by redefining
% the LaTeX parameter \baselinestretch to 2.
%
% It also fixes a number of problems with standard LaTeX, as follows:
%
% 1. A new environment "singlespace" is provided, within which single
%    spacing will apply. (Note that on entering this environment the
%    \normalsize command is issued automatically.)
% 2. Double spacing is turned off within footnotes and floats (figures
%    and tables).
% 3. Proper double spacing happens below tabular environments and in other
%    places where LaTeX uses a strut.
% 4. Slightly more space is inserted before footnotes.
%
% Note: This version sets a baselinestretch of 2. If this is too much,
%    put  \setstretch{1.7}  (or some appropriate value) before the
%    \begin{document} command. To print the document with single spacing
%    again, without removing "singlespace" environments, just put a
%    \setstretch{1} at the top of the document.
%
% Author: Stephen Page  -- sdpage@uk.ac.oxford.prg
% Release date: 6 July 1986, documentation revised 24 September 1986
%
% Known bugs:
%    . The \singlespace environment works sometimes (e.g. around titles)
%      but not always. Suggestions for a fix are welcomed!
%    . It might be nice if spacing before the footnote rule (\footins)
%      were provided in a tidier way.
%    . Increasing struts may possibly cause some other obscure part of
%      formatting to fall over.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%---Set up double spacing

\def\baselinestretch{2}


%---New command "\setstretch" (slightly more mnemonic... and easier to type)

\def\setstretch#1{\renewcommand{\baselinestretch}{#1}}

\def\sp8{\large \setstretch {.8} \normalsize}
\def\singlespacing{\large \setstretch 1 \normalsize}
\def\doublespacing{\large \setstretch 2 \normalsize}
\def\triplespacing{\large \setstretch 3 \normalsize}
\def\onehalfspacing{\large \setstretch {1.50} \normalsize}

\def\mspa{\large \setstretch {1.50} \normalsize}
\def\mspb{\large \setstretch {1.55} \normalsize}
\def\mspc{\large \setstretch {1.60} \normalsize}
\def\mspd{\large \setstretch {1.65} \normalsize}
\def\mspe{\large \setstretch {1.70} \normalsize}
\def\mspf{\large \setstretch {1.75} \normalsize}
\def\mspg{\large \setstretch {1.80} \normalsize}

%---New environment "singlespace".
%   The baselinestretch only takes effect at a size change, so do one.

\def\singlespace{\def\baselinestretch{1}\@normalsize}
\def\endsinglespace{}


%---Stretch the baseline BEFORE calculating the strut size. This improves
%   spacing below tabular environments etc., probably...
%   Comments are welcomed.

\def\@setsize#1#2#3#4{\@nomath#1\let\@currsize#1\baselineskip
   #2\baselineskip\baselinestretch\baselineskip
   \setbox\strutbox\hbox{\vrule height.7\baselineskip
      depth.3\baselineskip width\z@}
   \normalbaselineskip\baselineskip#3#4}


%---Increase the space between last line of text and footnote rule.
%   This is a very untidy way to do it!

\skip\footins 20pt plus4pt minus4pt


%---Reset baselinestretch within footnotes and floats. Originally stolen
%   from Stanford thesis style.

\def\@xfloat#1[#2]{\ifhmode \@bsphack\@floatpenalty -\@Mii\else
   \@floatpenalty-\@Miii\fi\def\@captype{#1}\ifinner
      \@parmoderr\@floatpenalty\z@
    \else\@next\@currbox\@freelist{\@tempcnta\csname ftype@#1\endcsname
       \multiply\@tempcnta\@xxxii\advance\@tempcnta\sixt@@n
       \@tfor \@tempa :=#2\do
                        {\if\@tempa h\advance\@tempcnta \@ne\fi
                         \if\@tempa t\advance\@tempcnta \tw@\fi
                         \if\@tempa b\advance\@tempcnta 4\relax\fi
                         \if\@tempa p\advance\@tempcnta 8\relax\fi
         }\global\count\@currbox\@tempcnta}\@fltovf\fi
    \global\setbox\@currbox\vbox\bgroup 
    \def\baselinestretch{1}\@normalsize
    \boxmaxdepth\z@
    \hsize\columnwidth \@parboxrestore}
\long\def\@footnotetext#1{\insert\footins{\def\baselinestretch{1}\footnotesize
    \interlinepenalty\interfootnotelinepenalty 
    \splittopskip\footnotesep
    \splitmaxdepth \dp\strutbox \floatingpenalty \@MM
    \hsize\columnwidth \@parboxrestore
   \edef\@currentlabel{\csname p@footnote\endcsname\@thefnmark}\@makefntext
    {\rule{\z@}{\footnotesep}\ignorespaces
      #1\strut}}}
