thesis/overlay.sty at master · craffit/thesis · GitHub

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\ProvidesPackage{overlay}[2011/03/01 v1.00 Overlays]

% overlay.sty - overlay and align two symbols, respecting styles
% Courtesy of Jeremy Gibbons: http://www.tug.org/TUGboat/hiw/hey-3n2.ps

\def\overlay#1#2{\mathpalette\@overlay{{#1}{#2}{\hfil}{\hfil}}}

\def\loverlay#1#2{\mathpalette\@overlay{{#1}{#2}{}{\hfil}}}

\def\roverlay#1#2{\mathpalette\@overlay{{#1}{#2}{\hfil}{}}}

% calls to \@overlay look like
% \@overlay\textstyle{{x}{y}{\hfil}{\hfil}}
\def\@overlay#1#2{\@@overlay#1#2}

% strip brackets from 2nd arg, to get
% \@@overlay\textstyle{x}{y}{\hfil}{\hfil}
\def\@@overlay#1#2#3#4#5{{%
  \def\overlaystyle{#1}%
  \setbox0=\hbox{\m@th$\overlaystyle#2$}%
  \setbox1=\hbox{\m@th$\overlaystyle#3$}%
  \ifdim \wd0<\wd1 \setbox2=\box1 \setbox1=\box0 \setbox0=\box2\fi
  % \box0 is now the wider box
  \rlap{\hbox to\wd0{#4\box1\relax#5}}\box0}}