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为什么这个标题从一页到另一页不断增长？

tag-icon • tag-icon tikz-pgf geometry scrlayer-scrpage
为什么这个标题从一页到另一页不断增长？

我使用tikz图片作为标题的一部分，带有scrlayer-scrpage和geometry。

如果我使用固定值定义高度，则页眉会按预期显示。但是，如果我用 替换\headheight，页眉会从一页变大到另一页。以下是该问题的说明。奇数页包含扩展页眉，偶数页包含固定页眉：

\documentclass{scrreprt}
\usepackage[twoside,inner=2.5cm,outer=4cm,bindingoffset=1cm,
top=4cm,bottom=4cm,headheight=1.5cm, headsep=1cm]{geometry}
\usepackage[manualmark]{scrlayer-scrpage}
\usepackage{tikz}
\usepackage{lipsum}

\newcommand{\myheader}{%
    \begin{tikzpicture}
    \node (graybar) 
    [fill=black!30,inner sep=0pt,text width=\textwidth,minimum height=\headheight,anchor=west] {};
    \node (leftsidebar) at (graybar.west)
    [fill=black,inner sep=0pt,text width=12pt,minimum height=\headheight,anchor=west] {};
    \node (rightsidebar) at (graybar.east)
    [fill=black,inner sep=0pt,text width=12pt,minimum height=\headheight,anchor=east] {};
    \end{tikzpicture}%
}

\newcommand{\myheadertwo}{%
    \begin{tikzpicture}
    \node (graybar) 
    [fill=black!30,inner sep=0pt,text width=\textwidth,minimum height=1.5cm,anchor=west] {};
    \node (leftsidebar) at (graybar.west)
    [fill=black,inner sep=0pt,text width=12pt,minimum height=1.5cm,anchor=west] {};
    \node (rightsidebar) at (graybar.east)
    [fill=black,inner sep=0pt,text width=12pt,minimum height=1.5cm,anchor=east] {};
    \end{tikzpicture}%
}

\lohead*{\myheader}
\lehead*{\myheadertwo}

\begin{document}
    \lipsum[1-100]
\end{document}

从下面的图片中你可以看出，在第一个双页跨页中，页眉是相等的，但奇数页的页眉不断增大。

第 1 和第 2 页： 第 1 页和第 2 页

第 17 和 18 页： 第 17 和 18 页

对于我的实际文档，我可以轻松使用固定值，因此这不是一个迫切的问题，但我想了解这种行为的原因，以防出现一些更深层次的潜在问题可能会再次困扰我。

答案1

scrlayer-scrpages 会告诉您为什么会发生这种情况。您只需查看日志文件：

Package scrlayer-scrpage Warning: \headheight to low.
(scrlayer-scrpage)                At least 83.4793pt needed,
(scrlayer-scrpage)                but only 79.39928pt found.
(scrlayer-scrpage)                I'll enlarge \headheight, for further
(scrlayer-scrpage)                processing, but you should do this yourself,
(scrlayer-scrpage)                e.g., setting geometry's option
(scrlayer-scrpage)                `head=83.4793pt'.
(scrlayer-scrpage)                I'll also decrease \topmargin on input line 47.

（几天前我也遇到了这个问题，真希望我可以告诉 scrlayer 不要打扰我并保持我的布局原样...）。

答案2

图片插入在页眉基线上方。但\headheight页眉的总高度包括基线下方的深度。因此，您必须将图片向下移动以\dp\strutbox获得

在此处输入图片描述

代码：

\documentclass{scrreprt}
\usepackage[twoside,inner=2.5cm,outer=4cm,bindingoffset=1cm,
top=4cm,bottom=4cm,headheight=1.5cm, headsep=1cm]{geometry}
\usepackage[manualmark]{scrlayer-scrpage}
\usepackage{tikz}
\usepackage{lipsum}

\newcommand{\myheader}{%
    \begin{tikzpicture}[nodes={minimum height=\headheight}]
    \node (graybar) 
    [fill=black!30,inner sep=0pt,text width=\textwidth,anchor=west] {};
    \node (leftsidebar) at (graybar.west)
    [fill=black,inner sep=0pt,text width=12pt,anchor=west] {};
    \node (rightsidebar) at (graybar.east)
    [fill=black,inner sep=0pt,text width=12pt,anchor=east] {};
    \end{tikzpicture}%
}

\newcommand{\myheadertwo}{%
    \begin{tikzpicture}[nodes={minimum height=1.5cm}]
    \node (graybar) 
    [fill=black!30,inner sep=0pt,text width=\textwidth,anchor=west] {};
    \node (leftsidebar) at (graybar.west)
    [fill=black,inner sep=0pt,text width=12pt,anchor=west] {};
    \node (rightsidebar) at (graybar.east)
    [fill=black,inner sep=0pt,text width=12pt,anchor=east] {};
    \end{tikzpicture}%
}

\lohead*{\raisebox{-\dp\strutbox}{\myheader}}
\lehead*{\raisebox{-\dp\strutbox}{\myheadertwo}}

\begin{document}
    \lipsum[1-100]
\end{document}

或者

\documentclass{scrreprt}
\usepackage[twoside,inner=2.5cm,outer=4cm,bindingoffset=1cm,
top=4cm,bottom=4cm,headheight=1.5cm, headsep=1cm]{geometry}
\usepackage[manualmark]{scrlayer-scrpage}
\usepackage{tikz}
\usepackage{lipsum}

\newcommand{\myheader}{%
    \begin{tikzpicture}[baseline=\dp\strutbox,nodes={minimum height=\headheight}]
    \node (graybar) 
    [fill=black!30,inner sep=0pt,text width=\textwidth,anchor=west] {};
    \node (leftsidebar) at (graybar.west)
    [fill=black,inner sep=0pt,text width=12pt,anchor=west] {};
    \node (rightsidebar) at (graybar.east)
    [fill=black,inner sep=0pt,text width=12pt,anchor=east] {};
    \end{tikzpicture}%
}

\newcommand{\myheadertwo}{%
    \begin{tikzpicture}[baseline=\dp\strutbox,nodes={minimum height=1.5cm}]
    \node (graybar) 
    [fill=black!30,inner sep=0pt,text width=\textwidth,anchor=west] {};
    \node (leftsidebar) at (graybar.west)
    [fill=black,inner sep=0pt,text width=12pt,anchor=west] {};
    \node (rightsidebar) at (graybar.east)
    [fill=black,inner sep=0pt,text width=12pt,anchor=east] {};
    \end{tikzpicture}%
}

\lohead*{\myheader}
\lehead*{\myheadertwo}

\begin{document}
    \lipsum[1-100]
\end{document}

您还可以通过以下方式降低节点的高度-\dp\strutbox：

\documentclass{scrreprt}
\usepackage[twoside,inner=2.5cm,outer=4cm,bindingoffset=1cm,
top=4cm,bottom=4cm,headheight=1.5cm, headsep=1cm]{geometry}
\usepackage[manualmark]{scrlayer-scrpage}
\usepackage{tikz}
\usepackage{lipsum}

\newcommand{\myheader}{%
    \begin{tikzpicture}[nodes={minimum height=\headheight-\dp\strutbox}]
    \node (graybar) 
    [fill=black!30,inner sep=0pt,text width=\textwidth,anchor=west] {};
    \node (leftsidebar) at (graybar.west)
    [fill=black,inner sep=0pt,text width=12pt,anchor=west] {};
    \node (rightsidebar) at (graybar.east)
    [fill=black,inner sep=0pt,text width=12pt,anchor=east] {};
    \end{tikzpicture}%
}

\newcommand{\myheadertwo}{%
    \begin{tikzpicture}[nodes={minimum height=1.5cm-\dp\strutbox}]
    \node (graybar) 
    [fill=black!30,inner sep=0pt,text width=\textwidth,anchor=west] {};
    \node (leftsidebar) at (graybar.west)
    [fill=black,inner sep=0pt,text width=12pt,anchor=west] {};
    \node (rightsidebar) at (graybar.east)
    [fill=black,inner sep=0pt,text width=12pt,anchor=east] {};
    \end{tikzpicture}%
}

\lohead*{\myheader}
\lehead*{\myheadertwo}

\begin{document}
    \lipsum[1-100]
\end{document}

或者您可以使用\smash内部\lohead*和\lehead*来隐藏图片的高度。

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