表格環境中旋轉框的間距

Question

有人可以解釋一下這個表中的間距嗎？

• 為什麼某些旋轉框具有由基線分隔的 0、1、2 或 3 個字元？
• 為什麼某些框中有前導/尾隨空格？

我不明白是什麼機制控制這些東西。

\documentclass{article}

\usepackage{array}
\usepackage{rotating}

\renewcommand{\arraystretch}{0}%
\setlength{\fboxsep}{0pt}%

\newcommand{\testBox}[2]{%
  \setlength{\fboxsep}{0pt}%
  \fboxrule=.1pt%
  \fbox{%
    \rotatebox[origin=#1]{#2}%
      {#1 #2}%
  }%
}

\begin{document}

\noindent
\tt

\begin{tabular}%
{@{}|llll|llll|llll|@{}}%
  \hline%
  \rlap{\rule{211pt}{.1pt}}%
  \testBox{rt}{090}&%
  \testBox{rb}{090}&%
  \testBox{rt}{270}&%
  \testBox{rb}{270}&%
  %
  \testBox{ct}{090}&%
  \testBox{cb}{090}&%
  \testBox{ct}{270}&%
  \testBox{cb}{270}&%
  %
  \testBox{lt}{090}&%
  \testBox{lb}{090}&%
  \testBox{lt}{270}&%
  \testBox{lb}{270}\\%
  \hline%
\end{tabular}

\end{document}

Answer 1

正如我評論的那樣，這對我來說是有道理的。指定的旋轉原點，例如[原始]框的右下角，在旋轉之前和之後保持在相同的垂直位置。唯一的怪癖是，如果旋轉的框最終會在基線和框之間出現間隙（例如，右上 270），則該框將延伸到基線，而無需重新定位文字。

為了說明我的意思，我對您的 MWE 進行了一些調整，以覆蓋未旋轉和旋轉的框框，其中旋轉點在前圖像和後圖像中都重疊。

\documentclass{article}

\usepackage{array}
\usepackage{rotating}

\renewcommand{\arraystretch}{0}%
\setlength{\fboxsep}{0pt}%

\newcommand{\testBox}[3][0]{%
  \setlength{\fboxsep}{0pt}%
  \fboxrule=.1pt%
  \setbox0=\hbox{\fbox{#2 #3}}%
  \fbox{%
      {#2 #3}%
  }\kern-\wd0%
  \rlap{\makebox[\dimexpr\wd0+#1\ht0][r]{\fbox{%
    \rotatebox[origin=#2]{#3}%
      {#2 #3}%
  }}}%
  \kern\wd0%
}

\begin{document}

\noindent
\tt

  \leavevmode\rlap{\rule{211pt}{.1pt}}
  \testBox[1]{rt}{090}\quad
  \testBox{rb}{090}\quad
  \testBox{rt}{270}\quad
  \testBox[1]{rb}{270}

\renewcommand{\testBox}[3][0]{%
  \setlength{\fboxsep}{0pt}%
  \fboxrule=.1pt%
  \setbox0=\hbox{\fbox{#2 #3}}%
  \fbox{%
      {#2 #3}%
  }\kern-\wd0%
  \rlap{\makebox[\dimexpr\wd0+#1\ht0][c]{\fbox{%
    \rotatebox[origin=#2]{#3}%
      {#2 #3}%
  }}}%
  \kern\wd0%
}
  \leavevmode\rlap{\rule{211pt}{.1pt}}
  \testBox[1]{ct}{090}\quad
  \testBox[-1]{cb}{090}\quad
  \testBox[-1]{ct}{270}\quad
  \testBox[1]{cb}{270}

\renewcommand{\testBox}[3][0]{%
  \setlength{\fboxsep}{0pt}%
  \fboxrule=.1pt%
  \setbox0=\hbox{\fbox{#2 #3}}%
  \fbox{%
      {#2 #3}%
  }\kern-\dimexpr\wd0+#1\ht0\relax%
  \rlap{\makebox[\wd0][l]{\fbox{%
    \rotatebox[origin=#2]{#3}%
      {#2 #3}%
  }}}%
  \kern+\dimexpr\wd0+#1\ht0\relax%%
}
  \leavevmode\rlap{\rule{211pt}{.1pt}}
  \testBox{lt}{090}\quad
  \testBox[1]{lb}{090}\quad
  \testBox[1]{lt}{270}\quad
  \testBox{lb}{270}


\end{document}

為了澄清起見，我在旋轉原點手動添加了（在 LaTeX 之外）紅色標記。