为什么在 LaTeX 中生成 \midrule dashed 如此困难？

Question

我想要得到 的等效虚线版本\cmidule(lr){1-2}。看来解决方案并不简单。

您想到的最简单的方法是什么？

Answer 1

下面实现了一种新的“绘制类型”，相当于（某种程度上）\cdashlinelr常规\cmidrule(lr)垂直间距：

\documentclass{article}

\usepackage{booktabs,arydshln}

\makeatletter
\def\adl@drawiv#1#2#3{%
        \hskip.5\tabcolsep
        \xleaders#3{#2.5\@tempdimb #1{1}#2.5\@tempdimb}%
                #2\z@ plus1fil minus1fil\relax
        \hskip.5\tabcolsep}
\newcommand{\cdashlinelr}[1]{%
  \noalign{\vskip\aboverulesep
           \global\let\@dashdrawstore\adl@draw
           \global\let\adl@draw\adl@drawiv}
  \cdashline{#1}
  \noalign{\global\let\adl@draw\@dashdrawstore
           \vskip\belowrulesep}}
\makeatother

\begin{document}

\begin{tabular}{lll}
  \toprule
  This is a & nice table  & with three columns \\
  \cmidrule(lr){2-3}
  Some      & row content & in the second row  \\
  \bottomrule
\end{tabular}
\begin{tabular}{lll}
  \toprule
  This is a & nice table  & with three columns \\
  \cdashlinelr{2-3}
  Some      & row content & in the second row  \\
  \bottomrule
\end{tabular}

\end{document}

Answer 2

以下是您可以使用 做的{NiceTabular}事情nicematrix。

{tabular}该环境与经典环境（的）类似，array但在单元格、行和列下创建了 PGF/Tiks 节点。

构建数组后，可以使用这些节点在 Tikz 中绘制您想要的任何规则。

\documentclass{article}
\usepackage{nicematrix,tikz}
\usepackage{booktabs}

\begin{document}

\begin{NiceTabular}{lll}
\toprule
This is a & nice table  & with three columns \\
Some      & row content & in the second row  \\
\bottomrule
\CodeAfter
\tikz \draw [dashed, shorten < = 4pt, shorten > = 4pt] (2-|2) -- (2-|4) ;
\end{NiceTabular}

\end{document}