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寻求区分比例因子和尺寸

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寻求区分比例因子和尺寸

我希望能够定义一个宏，然后\def\testit{<something>}测试一下它<something>是什么。如果<something>是维度（例如4in），那么我可以这样做

\resizebox{4in}{<thing to be resized>}

否则（例如<something>=0.75）我会这样做

\scalebox{0.75}{<thing to be scaled>}

答案1

这与 LaTeX 的操作类似\fontsize：

\documentclass{article}

\makeatletter
\newcommand{\dimenorfactor}[3]{%
  \afterassignment\dim@or@factor\skip@=#1pt@{#2}{#3}%
}
\def\dim@or@factor#1@#2#3{%
  \if\relax\detokenize{#1}\relax#3\else#2\fi
}
\makeatother

\begin{document}

\newlength{\testdim}\setlength{\testdim}{4pt}
\newcommand\test[1]{%
  \dimenorfactor{#1}{\typeout{#1 is a dimen}}{\typeout{#1 is not a dimen}}%
}

\test{123 }
\test{1.23}
\test{123.22 mm}
\test{-.2 pt }

\stop

终端上输出：

123  is not a dimen
1.23 is not a dimen
123.22 mm is a dimen
-.2 pt  is a dimen
\testdim  is a dimen

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