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用重复符号给文本加下划线

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用重复符号给文本加下划线

我想通过重复一个符号来加下划线（例如+）。我有一段适用于下划线的代码x，但我无法让它适用于+：

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{decorations.pathmorphing}
\usetikzlibrary{decorations.pathreplacing}
\usetikzlibrary{decorations.shapes}

\newcommand{\latexunderplus}[1]{%
    \tikz[baseline=(todotted.base)]{
        \node[inner xsep=0pt,inner ysep=1pt,outer sep=0pt] (todotted) {#1};
        \draw[decorate,decoration={crosses,shape size=1pt},segment length=2pt] (todotted.south west) -- (todotted.south east);
    }%
}%

\begin{document}
\latexunderplus{qwe}
\end{document}

从我读过的内容来看，我可能可以使用 来\pgfdeclareshape声明与我的符号相对应的新形状，然后使用它代替crosses。这意味着告诉 tikz 如何绘制我用于下划线的每个符号。还有其他（更简单的）方法吗？例如，某些函数可以自动将字符转换为形状？

答案1

如果您愿意尝试一点普通的 TeX，您可以使用框和引线来做到这一点：

\documentclass{article}
\def\undermark#1#2{\setbox0\hbox{#2}\hbox to 0pt{\copy0\hss}\lower2ex\hbox to
   \wd0{\cleaders\hbox{#1}\hfil}}
\begin{document}
However, a service-oriented \undermark{$\cdot$}{paradigm} is further compounded
when taking into account the evolution of specifications over a given time period.
Interestingly enough, the fully integrated test program presents extremely
interesting challenges to the preliminary \undermark{$\scriptstyle+$}{qualification} limit.  Similarly, the
incorporation of additional mission constraints must utilize and be functionally
interwoven with possible bidirectional logical relationship \undermark{x}{approaches}.
\end{document}

在此处输入图片描述

观察结果

  • 这不是很强大 - 例如，如果在行尾附近使用它，它会弄乱换行。

  • 我认为它的印刷效果看起来很丑。

解释

  • \def\undermark#1#2定义一个需要两个参数的命令

  • \setbox0\hbox{#2}将盒子寄存器 0 设置为包含第二个参数的盒子

  • \hbox to 0pt{\copy0\hss}排版一个零宽度的框，其中包含框寄存器 0 的内容，所有内容均突出在右侧。

  • \lower2ex在基线下方排版以下框 2ex

  • \hbox to \wd0{}排版 aa 框拉伸至框寄存器 0 的宽度

  • \cleaders\hbox{#1}\hfil创建由包含第一个参数的框的副本组成的可拉伸图案

答案2

您可能只需旋转十字架，就能为 发明一种新的装饰\ominus。这可以通过查找pgflibrarydecorations.shapes.code.tex、从那里复制代码并进行调整来完成。

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{decorations.pathmorphing}
\usetikzlibrary{decorations.pathreplacing}
\usetikzlibrary{decorations.shapes}

\makeatletter
\pgfdeclaredecoration{ominus}{init}
{
  \state{init}[width=+0pt,next state=crosses,persistent precomputation={
    \pgfmathparse{\pgfkeysvalueof{/pgf/decoration/shape start width}/sqrt(8)}
    \edef\pgf@lib@dec@ssw{\pgfmathresult pt}
    \pgfmathparse{\pgfkeysvalueof{/pgf/decoration/shape start height}/2}
    \edef\pgf@lib@dec@ssh{\pgfmathresult pt}
  }]{}  
  \state{crosses}[switch if less than=+\pgfdecorationsegmentlength to last,
                  width=+\pgfdecorationsegmentlength]
  {
    \pgfpathmoveto{\pgfqpoint{-\pgf@lib@dec@ssw}{0pt}}
    \pgfpathlineto{\pgfqpoint{\pgf@lib@dec@ssw}{0pt}}
    \pgfpathlineto{\pgfqpoint{\pgf@lib@dec@ssw}{0pt}}
    \pgfpathcircle{\pgfpointorigin}{\pgf@lib@dec@ssw}\pgfusepath{stroke}
  }
  \state{last}[width=+\pgfdecoratedremainingdistance]
  {
    \pgfpathmoveto{\pgfqpoint{-\pgf@lib@dec@ssw}{0pt}}
    \pgfpathlineto{\pgfqpoint{\pgf@lib@dec@ssw}{0pt}}
    \pgfpathlineto{\pgfqpoint{\pgf@lib@dec@ssw}{0pt}}
    \pgfpathcircle{\pgfpointorigin}{\pgf@lib@dec@ssw}\pgfusepath{stroke}
  }
  \state{final}{
    \pgfpathmoveto{\pgfpointdecoratedpathlast}
    \pgfpathmoveto{\pgfqpoint{-\pgf@lib@dec@ssw}{0pt}}
    \pgfpathlineto{\pgfqpoint{\pgf@lib@dec@ssw}{0pt}}
    \pgfpathlineto{\pgfqpoint{\pgf@lib@dec@ssw}{0pt}}
    \pgfpathcircle{\pgfpointorigin}{\pgf@lib@dec@ssw}\pgfusepath{stroke}
  }
}
\makeatother


\newcommand{\latexunderplus}[1]{%
    \tikz[baseline=(todotted.base)]{
        \node[inner xsep=0pt,inner ysep=1pt,outer sep=0pt] (todotted) {#1};
        \draw[decorate,decoration={crosses,shape size=2pt,transform={rotate=45}},segment length=2pt] (todotted.south west) -- (todotted.south east);
    }%
}%

\newcommand{\latexunderominus}[1]{%
    \tikz[baseline=(todotted.base)]{
        \node[inner xsep=0pt,inner ysep=1pt,outer sep=0pt] (todotted) {#1};
        \draw[decorate,decoration={ominus,shape size=5pt},segment length=5pt] (todotted.south west) -- (todotted.south east);
    }%
}%



\begin{document}
\latexunderplus{qwe}
\latexunderominus{qwe}
\end{document}

在此处输入图片描述

答案3

两种解决方案并列：

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{decorations.pathmorphing}
\usetikzlibrary{decorations.pathreplacing}
\usetikzlibrary{decorations.shapes}
\usepackage{anyfontsize}
\usepackage{calc}
\def\undermark#1#2{
    \setbox0\hbox{#2}\hbox to 0pt{\copy0\hss}\lower\the\dimexpr\dp0+2pt\relax\hbox to
    \wd0{\cleaders\hbox{#1}\hfil}}

\makeatletter
\pgfdeclaredecoration{ominus}{init}
{
    \state{init}[width=+0pt,next state=crosses,persistent precomputation={
        \pgfmathparse{\pgfkeysvalueof{/pgf/decoration/shape start width}/sqrt(8)}
        \edef\pgf@lib@dec@ssw{\pgfmathresult pt}
        \pgfmathparse{\pgfkeysvalueof{/pgf/decoration/shape start height}/2}
        \edef\pgf@lib@dec@ssh{\pgfmathresult pt}
    }]{}  
    \state{crosses}[switch if less than=+\pgfdecorationsegmentlength to last,
    width=+\pgfdecorationsegmentlength]
    {
        \pgfpathmoveto{\pgfqpoint{-\pgf@lib@dec@ssw}{0pt}}
        \pgfpathlineto{\pgfqpoint{\pgf@lib@dec@ssw}{0pt}}
        \pgfpathlineto{\pgfqpoint{\pgf@lib@dec@ssw}{0pt}}
        \pgfpathcircle{\pgfpointorigin}{\pgf@lib@dec@ssw}\pgfusepath{stroke}
    }
    \state{last}[width=+\pgfdecoratedremainingdistance]
    {
        \pgfpathmoveto{\pgfqpoint{-\pgf@lib@dec@ssw}{0pt}}
        \pgfpathlineto{\pgfqpoint{\pgf@lib@dec@ssw}{0pt}}
        \pgfpathlineto{\pgfqpoint{\pgf@lib@dec@ssw}{0pt}}
        \pgfpathcircle{\pgfpointorigin}{\pgf@lib@dec@ssw}\pgfusepath{stroke}
    }
    \state{final}{
        \pgfpathmoveto{\pgfpointdecoratedpathlast}
        \pgfpathmoveto{\pgfqpoint{-\pgf@lib@dec@ssw}{0pt}}
        \pgfpathlineto{\pgfqpoint{\pgf@lib@dec@ssw}{0pt}}
        \pgfpathlineto{\pgfqpoint{\pgf@lib@dec@ssw}{0pt}}
        \pgfpathcircle{\pgfpointorigin}{\pgf@lib@dec@ssw}\pgfusepath{stroke}
    }
}
\makeatother

\newcommand{\latexunderplus}[1]{%
    \tikz[baseline=(todotted.base)]{
        \node[inner xsep=0pt,inner ysep=1pt,outer sep=0pt] (todotted) {#1};
        \draw[decorate,decoration={crosses,shape size=1.5pt,transform={rotate=45}},segment length=2.5pt] (todotted.south west) -- (todotted.south east);
    }%
}%

\newcommand{\latexunderominus}[1]{%
    \tikz[baseline=(todotted.base)]{
        \node[inner xsep=0pt,inner ysep=1pt,outer sep=0pt] (todotted) {#1};
        \draw[decorate,decoration={ominus,shape size=2.5pt},segment length=3pt] (todotted.south west) -- (todotted.south east);
    }%
}%

\begin{document}

\newcommand{\mytest}[1]{
    $\latexunderplus{\ensuremath{#1}}$
    $\latexunderominus{\ensuremath{#1}}$
    vs
    $\undermark{\fontsize{2pt}{3pt}\selectfont +}{\ensuremath{#1}}$
    $\undermark{\fontsize{2pt}{3pt}\selectfont \ensuremath{\ominus}}{\ensuremath{#1}}$
}

\mytest{\ensuremath{V_1}}\\
\mytest{qwe}\\
\mytest{abc}


\end{document}

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