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empheq 的间距错误

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empheq 的间距错误

请考虑以下示例：

\documentclass{article}

\usepackage{mathtools}
\usepackage[amsmath]{empheq}

\usepackage{xcolor}
\definecolor{shadecolor}{cmyk}{0,0,0.45,0}
\definecolor{light-blue}{cmyk}{0.25,0,0,0}
\newsavebox{\mysaveboxM}
\newsavebox{\mysaveboxT}

\newcommand*\Yellowbox[2][Formel]{%
  \sbox{\mysaveboxM}{#2}
  \sbox{\mysaveboxT}{\fcolorbox{black}{light-blue}{#1}}
  \sbox{\mysaveboxM}{%
    \parbox[b][\ht\mysaveboxM+0.4\ht\mysaveboxT+0.8\dp\mysaveboxT][b]{%
      \wd\mysaveboxM}{#2}
  }
  \sbox{\mysaveboxM}{%
    \fcolorbox{black}{shadecolor}{%
      \makebox[\linewidth]{\usebox{\mysaveboxM}}%
    }%
  }%
  \usebox{\mysaveboxM}%
  \makebox[0pt][r]{%
    \makebox[\wd\mysaveboxM][c]{%
      \raisebox{\ht\mysaveboxM-0.5\ht\mysaveboxT
                +0.5\dp\mysaveboxT-0.5\fboxrule}{\usebox{\mysaveboxT}}
    }
  }
}

\begin{document}

\begin{empheq}[box={\Yellowbox[Inverse $3 \times 3$ matrix]}]{equation*}
  \textsf{A}^{-1}
  = \frac{1}{a(ei-fh)+b(fg-di)+c(dh-eg)}
    \begin{pmatrix}
      ei-fh & ch-bi & bf-ce\\
      fg-di & ai-cg & cd-af\\
      dh-eg & bg-ah & ae-bd
    \end{pmatrix}
\end{empheq}

\end{document}

输出

为什么盒子里的内容没有水平居中？

PS 我从empheq手动的并做了一些修改。

更新

我感觉有些事情已经改变，empheq因为我以前使用过上述代码，没有任何问题。

答案1

您在 的定义中有几个不受保护的行尾\Yellowbox；您还有一个过满的盒子，因为您没有考虑\fboxsep和\fboxrule。

\documentclass{article}

\usepackage{mathtools}
\usepackage[amsmath]{empheq}
\usepackage{calc}


\usepackage{xcolor}
\definecolor{shadecolor}{cmyk}{0,0,0.45,0}
\definecolor{light-blue}{cmyk}{0.25,0,0,0}
\newsavebox{\mysaveboxM}
\newsavebox{\mysaveboxT}

\newcommand*\Yellowbox[2][Formel]{%
  \sbox{\mysaveboxM}{#2}%
  \sbox{\mysaveboxT}{\fcolorbox{black}{light-blue}{#1}}%
  \sbox{\mysaveboxM}{%
    \parbox[b][\ht\mysaveboxM+0.4\ht\mysaveboxT+0.8\dp\mysaveboxT][b]{%
      \wd\mysaveboxM}{#2}%
  }
  \sbox{\mysaveboxM}{%
    \fcolorbox{black}{shadecolor}{%
      \makebox[\displaywidth-2\fboxsep-2\fboxrule]{\usebox{\mysaveboxM}}%
    }%
  }%
  \usebox{\mysaveboxM}%
  \makebox[0pt][r]{%
    \makebox[\wd\mysaveboxM][c]{%
      \raisebox{\ht\mysaveboxM-0.5\ht\mysaveboxT
                +0.5\dp\mysaveboxT-0.5\fboxrule}{\usebox{\mysaveboxT}}%
    }%
  }%
}

\begin{document}

\noindent X\hrulefill X\par
\begin{empheq}[box={\Yellowbox[Inverse $3 \times 3$ matrix]}]{equation*}
  \textsf{A}^{-1}
  = \frac{1}{a(ei-fh)+b(fg-di)+c(dh-eg)}
    \begin{pmatrix}
      ei-fh & ch-bi & bf-ce\\
      fg-di & ai-cg & cd-af\\
      dh-eg & bg-ah & ae-bd
    \end{pmatrix}
\end{empheq}

\end{document}

在此处输入图片描述

右侧的空间显然比左侧的空间大，这是因为大括号（和pmatrix）留出了更多空间。可能应该使用\displaywidth，而不是。\linewidth

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