\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{showdim}[1998/07/29 v1.1 (Michael J Downes)]

%    Print a dimen value in points, rounded to the nearesth tenth
%
\newcommand{\tenthpt}[1]{\dimen@#1\relax
%      Round up to the nearest tenth, by half-adding:
  \advance\dimen@ \ifdim\dimen@<\z@-\fi .05\p@
  \expandafter\tenth@extract\the\dimen@ pt}

%    Print a dimen value in picas, rounded to the nearesth tenth
%
\newcommand{\tenthpc}[1]{\dimen@#1\relax
%    Round up to the nearest tenth
  \advance\dimen@ \ifdim\dimen@<\z@-\fi .05pc%
  \divide\dimen@ 12 \expandafter\tenth@extract\the\dimen@ pc}

%    Print a dimen value in picas, rounded to the nearesth hundredth
%
\newcommand{\hundredthpc}[1]{\dimen@#1\relax
%    Round up to the nearest hundredth
  \advance\dimen@ \ifdim\dimen@<\z@-\fi .005pc%
  \divide\dimen@ 12 \expandafter\hundredth@extract\the\dimen@ pc}

%    Print a value in tenths of a pica and whole points.
%
\newcommand{\tenthpcpt}[1]{\tenthpc{#1} (\points{#1})}

%    Print a value in points and tenths of a pica.
%
\newcommand{\pttenthpc}[1]{\points{#1} (\tenthpc{#1})}

%    Print a value in points followed by the equivalent in picas (to
%    two decimal places).
%
\newcommand{\pthundredthpc}[1]{\points{#1} (\hundredthpc{#1})}

%    Print a value truncated to one place after the decimal point
%    (maximum).
%
\edef\@tempa#1pt{#1\string p\string t}\@tempa
\def\tenth@extract#1.#2#3pt{#1\ifnum#2=\z@ \else.#2\fi}

%    Print a value truncated to two places after the decimal point
%    (maximum).
%
\edef\@tempa#1pt{#1\string p\string t}\@tempa
\def\hundredth@extract#1.#2#3pt{#1\h@extract#2#300\@nil}

%    Extract a hundredths value: .0 is converted to "", .1 and .10 are both
%    converted to ".1", and .03 or .93 are printed as is.
%
\def\h@extract#1#2#3\@nil{%
   \ifnum#1#2=\z@ \else.#1\ifnum#2=\z@ \else#2\fi\fi}

%    Print a dimen value rounded to the nearest whole point.
%
\newcommand{\points}[1]{\dimen@#1\relax
  \advance\dimen@ \ifdim\dimen@<\z@-\fi .5\p@
  \expandafter\wholepart@extract\the\dimen@\@nil pt}

%    Convert a negative point value to a positive value, for use in
%    messages such as "height of box A is \negpoints{\dimen@} less
%    than height of box B", where the negativity is conveyed by the
%    word "less" and therefore the minus sign should be removed from
%    the actual value that is printed in order not to be redundant.
%
\newcommand{\negpoints}[1]{\points{-#1}}

%    Print a dimen value converted to the nearest whole pica.
%
\newcommand{\picas}[1]{\dimen@#1\relax
  \advance\dimen@ \ifdim\dimen@<\z@-\fi .5pc%
  \divide\dimen@ 12 \expandafter\wholepart@extract\the\dimen@\@nil pc}

%    Extract the whole part of a decimal number (i.e. the part before
%    the decimal point.)
%
\def\wholepart@extract#1.#2\@nil{#1}

\endinput %
