使用 TikZ 安装背景和前景页面层

Question 1

我的方法可以达到类似的效果。为 TikZ 全局声明背景：

\pgfdeclarelayer{background}
\pgfdeclarelayer{foreground}
\pgfsetlayers{background,main,foreground}

然后在普通文本中放置“标记”的命令：

% place an inline node that is remembered for tikz
% \tikzremember{<node name>}
%   note: you have to compile twice
\newcommand{\tikzremember}[1]{{
  \tikz[remember picture,overlay]{\node (#1) at (0,11pt) { };}
}}

并在文档中使用它：

\tikzremember{bgstart}\lipsum*[2]\unskip\tikzremember{bgend}

现在，我在页面上有了 TikZ 节点，可以随心所欲地使用它们绘制任何我想要的图层。例如，一条大绿线：

\begin{tikzpicture}[remember picture,overlay]
\begin{pgfonlayer}{background}
\draw [green,line width=1cm] (bgstart.north east) -- (bgend.south west);
\end{pgfonlayer}{background}
\begin{pgfonlayer}{foreground}
\draw [green,line width=1cm] (bgstart.north east) -- (bgend.south west);
\end{pgfonlayer}{foreground}
\end{tikzpicture}

此技术窃自http://www.texample.net/tikz/examples/oxidation-and-reduction/

Answer

我的方法可以达到类似的效果。为 TikZ 全局声明背景：

\pgfdeclarelayer{background}
\pgfdeclarelayer{foreground}
\pgfsetlayers{background,main,foreground}

然后在普通文本中放置“标记”的命令：

% place an inline node that is remembered for tikz
% \tikzremember{<node name>}
%   note: you have to compile twice
\newcommand{\tikzremember}[1]{{
  \tikz[remember picture,overlay]{\node (#1) at (0,11pt) { };}
}}

并在文档中使用它：

\tikzremember{bgstart}\lipsum*[2]\unskip\tikzremember{bgend}

现在，我在页面上有了 TikZ 节点，可以随心所欲地使用它们绘制任何我想要的图层。例如，一条大绿线：

\begin{tikzpicture}[remember picture,overlay]
\begin{pgfonlayer}{background}
\draw [green,line width=1cm] (bgstart.north east) -- (bgend.south west);
\end{pgfonlayer}{background}
\begin{pgfonlayer}{foreground}
\draw [green,line width=1cm] (bgstart.north east) -- (bgend.south west);
\end{pgfonlayer}{foreground}
\end{tikzpicture}

此技术窃自http://www.texample.net/tikz/examples/oxidation-and-reduction/

Question 2

我对于此事的“应该”和“不应该”并没有什么可说的，因为我并不太清楚其中涉及的潜在问题，但我想分享一下前几天遇到的一些可能有用的东西。

在尝试弄清楚 beamer 如何构建框架（在此处插入链接）时，我仔细查看了 beamer 代码。结果发现背景层是通过挂接到页眉和页脚来插入的。由于 TeX 将页眉和页脚放在第一的它们可用于将内容放在页面后面。我不知道这是否比你正在做的更好，而且它只解决了背景部分，但这是一个可以突出显示的概念验证。

实际的突出显示并不是那么复杂（因为这是一个概念验证）。它所做的就是想象你有一支荧光笔，并在页面上画出它，从某个点开始，到另一个点结束。因此，具体来说，它不会尝试跟随文本行，但它确实确保它获取起点和终点之间的所有内容。

当然，人们需要小心实际的standalone标题以确保它们排版正确。另外，据我所知，它对类来说不值得。

结果：

突出显示页面后面的内容

代码：

\documentclass{article}
\pagestyle{empty}
\usepackage{tikz}
\makeatletter
\newbox\bg@tempbox
\newdimen\bg@tempdim
\def\ps@background{%
  \def\@oddhead{%
  \begingroup
  \setbox\bg@tempbox=\hbox{\begin{tikzpicture}[remember picture,overlay]
      \coordinate (page west);
      \coordinate (path north);
      \path  (\textwidth,0) coordinate (page east);
      \path (0,\textheight) coordinate (page south);
      \bg@contents
    \end{tikzpicture}}%
    \wd\bg@tempbox=0pt\ht\bg@tempbox=0pt\dp\bg@tempbox=0pt%
    \vbox{\hbox{\box\bg@tempbox}}%
    \global\let\bg@contents=\@empty
    \endgroup\hfil}
  \let\@evenhead\@oddhead
}
\pagestyle{background}
\def\bg@contents{%
}
\newcommand{\tikzmark}[1]{\tikz[remember picture,overlay] \coordinate (#1);}

\newcommand{\addtobg}[1]{%
  \g@addto@macro\bg@contents{#1}%
}

\newcounter{highlight}
\newcommand{\hlstart}{\tikz[remember picture,overlay,baseline=-0.7ex] \coordinate (hlstart\the\value{highlight});\hl@start}
\newcommand{\hlend}{\tikz[remember picture,overlay,baseline=-0.7ex] \coordinate (hlend\the\value{highlight});\hl@end\stepcounter{highlight}}

\newcommand{\hl@start}{%
  \edef\@temp{%
    \noexpand\addtobg{\noexpand\hl@draw{\the\value{highlight}}}%
  }%
  \@temp
}

\newcommand{\hl@end}{}

\newcommand{\hl@draw}[1]{%
  \path (hlstart#1);
  \pgfgetlastxy{\hlsx}{\hlsy}%
  \path (hlend#1);
  \pgfgetlastxy{\hlex}{\hley}%
  \ifdim\hlsy=\hley\relax
  \draw[highlight] (hlstart#1) -- (hlend#1);
  \else
  \draw[highlight] (hlstart#1) -- (hlstart#1 -| page east);
  \pgfmathtruncatemacro{\bg@lines}{int((\hley - \hlsy)/12pt) + 1}%
  \foreach \bg@line in {-1,...,\bg@lines} {
    \path (hlstart#1) ++(0,\bg@line * 12pt) coordinate (bgtmp);
    \draw[highlight] (bgtmp -| page west) -- (bgtmp -| page east);
  }%
  \path (hlstart#1) ++(0,\bg@lines * 12pt - 12pt) coordinate (bgtmp);
  \draw[highlight] (bgtmp -| page west) -- (hlend#1);
  \fi
}

\tikzset{%
  highlight/.style={
    yellow,
    line width=12pt,
  }
}

\makeatother


\begin{document}

One of the suggested uses for this blog is to \hlstart highlight great questions\hlend\ and answers.
I'm proposing the following question for a \textbf{Great Question}.
(I'm linking to it early in case you get bored with the blog post and just want to look at the question.)

Good keyboard layouts for typing (La)TeX.

To encourage you to look at that, let me first divulge my reason why I consider that a Great Question (and no, it's not because I answered it).
\hlstart I don't intend to be prescriptive about what a Great Question is, but certainly one good indicator is that it is a question that you should read even if you don't know that you should read it\hlend.
What I mean by that is that this question is probably one that you would pass in the street if you came upon it, but that once you've actually read it you will (I hope) think, ``I wish I'd read that years ago!''.

The rest of this post is for those of you who want a little more reason for reading it, or who having read it don't quite get what I'm making all the fuss about.
\end{document}

Answer