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计算 fancyhdr 所需的头部高度，意外地不是线性的

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计算 fancyhdr 所需的头部高度，意外地不是线性的

我正在尝试计算使用 创建的标题的高度fancyhdr。实际格式有点复杂，取决于某些命令的返回值（无法进行硬编码）。我尝试根据字体大小和已知间距计算所需的高度。然而，这与预期不符fancyhdr。

如果我故意将 headerheight 设置为太小，fancyhdr 会建议 header 的大小。此值每次都有效，但不随行数线性缩放。下面写了一个 MWE。

我有三个问题：

  1. 为什么这些价值观是这样的？
  2. 我该如何正确计算身高？
  3. 是否可以通过 LaTeX 代码获取 fancyhdr 的估计（预渲染）？


\documentclass[12pt,onecolumn,oneside]{article}
\usepackage[lmargin=1.5in, rmargin=1.0in, tmargin=1.0in, bmargin=1.0in]{geometry}
\usepackage{fancyhdr}


\renewcommand{\headrulewidth}{0pt}

\fancypagestyle{customone}{
\fancyhf{}

    \lhead{
        Line 1
    }
}

\fancypagestyle{customtwo}{
    \fancyhf{}

    \lhead{
        Line 1\\
        Line 2
    }
}

\fancypagestyle{customthree}{
    \fancyhf{}

    \lhead{
        Line 1\\
        Line 2\\
        Line 3
    }
}

\pagestyle{customtwo}

\begin{document}
\noindent The minimum required \textit{headheight} for \textit{customone} is 14.49998pt.\\
The minimum required \textit{headheight} for \textit{customtwo} is 27.04604pt.\\
The minimum required \textit{headheight} for \textit{customthree} is 41.5604pt.\\
The height difference between \textit{customone} and \textit{customtwo} is 12.54606pt.\\
The height difference between \textit{customtwo} and \textit{customthree} is 14.51436pt.\\
The heights divided by the number of lines are: 14.49998pt, 13.52302pt, 13.853466pt.
\end{document}

答案1

页眉/页脚内容设置在框内，而此框实际上并不构成常规文本框/内容的一部分。因此，它不会使用相同的基线跳过（行高和深度）进行设置。因此，为了让您看到页眉使用的一致头部高度，请将内容设置在 内tabular，或使用\struts：

在此处输入图片描述

\documentclass[12pt]{article}

\usepackage[lmargin=1.5in, rmargin=1.0in, tmargin=1.0in, bmargin=1.0in]{geometry}
\usepackage{fancyhdr}

\renewcommand{\headrulewidth}{0pt}

\fancypagestyle{customone}{%
  \fancyhf{}%
  \lhead{%
    \strut Line 1%
  }%
}

\fancypagestyle{customtwo}{%
  \fancyhf{}%
  \lhead{%
    \begin{tabular}{ c }
      Line 1\\
      Line 2
    \end{tabular}%
  }%
}

\fancypagestyle{customthree}{%
  \fancyhf{}%
  \lhead{%
    \begin{tabular}{ c }
        pine 1\\
        Line 2\\
        Line 3
    \end{tabular}%
  }%
}

\pagestyle{customone}
%\pagestyle{customtwo}
%\pagestyle{customthree}

\setlength{\parindent}{0pt}% Just for this example

\begin{document}

The minimum required \texttt{\string\headheight} for \texttt{customone} is 14.49998pt. \par
The minimum required \texttt{\string\headheight} for \texttt{customtwo} is 28.99997pt. \par
The minimum required \texttt{\string\headheight} for \texttt{customthree} is 43.49995pt. \par
The height difference between \texttt{customone} and \texttt{customtwo} is 14.49999pt. \par
The height difference between \texttt{customtwo} and \texttt{customthree} is 14.49998pt. \par
The heights divided by the number of lines are: 14.49998pt, 14.499985pt, 14.49998333pt.

%\texttt{\string\baselineskip}: \the\baselineskip% 14.5pt under 12pt base font size

\end{document}

因此，如果您使用一致的基线跳过设置内容，则可以使用的倍数\baselineskip，并确保内容适合；基本字体大小为\baselineskip。的偏差是由于四舍五入造成的。12pt14.5pt\headheight

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