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数字下方的箭头（第 2 部分问题）

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数字下方的箭头（第 2 部分问题）

我需要数字下方指向正确方向的箭头的代码。我在网上查找了命令，我所知道的\uarrow都是向左而不是向右的。：

在此处输入图片描述

谢谢 Hendrik。我的问题解决了！

答案1

先前的解决方案在数字下方添加箭头允许提供选项，\DrawArrow您可以使用这些选项来反转箭头的方向。您可以\DrawArrow从以下方式更改所有后续调用的箭头样式：

\tikzset{BottomArrowStyle/.style={thin, -stealth}}

该选项从左到右-stealth绘制一个样式箭头，以stealth

\tikzset{BottomArrowStyle/.style={thin, stealth-}}

它从右到左绘制箭头，如右侧第一行所示。

或者，您可以<-为每个指定\DrawArrow方向，然后可以根据需要混合搭配方向，如第二行右侧所示，其中和olive以magenta相反的方向绘制。我认为您不是想这样做，而是为了说明其用途。

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代码：

\documentclass{article} 

\usepackage{xparse}
\usepackage{tikz}
\usetikzlibrary{calc}


%% Set these if you want to globally atler the arrow styles
%% for the top and bottom arrows.
\tikzset{TopArrowStyle/.style={}}%
\tikzset{BottomArrowStyle/.style={}}%


\newcommand{\tikzmark}[2]{%
    \tikz[overlay,remember picture,baseline] \node [anchor=base] (#1) {\phantom{#2}};#2%
}

\newcommand*{\XShift}{0.5ex}%
\newcommand*{\ArcDistance}{0.075cm}%
\newcommand*{\OutAngle}{}%
\newcommand*{\InAngle}{}%
\newcommand*{\AnchorPoint}{}%
\newcommand*{\ShortenBegin}{}%
\newcommand*{\ShortenEnd}{}%
%
\NewDocumentCommand{\DrawArrow}{s O{} m m}{%
    \IfBooleanTF {#1} {% starred variant - draw arrows below
        \renewcommand*{\OutAngle}{-95}%
        \renewcommand*{\InAngle}{-85}%
        \renewcommand*{\AnchorPoint}{south}%
        \renewcommand*{\ShortenBegin}{-3.5pt}%
        \renewcommand*{\ShortenEnd}{-3.5pt}%
        \tikzset{Arrow Style/.style={BottomArrowStyle}}%
    }{% non-starred - draw arrows above
        \renewcommand*{\OutAngle}{95}%
        \renewcommand*{\InAngle}{85}%
        \renewcommand*{\AnchorPoint}{north}%
        \renewcommand*{\ShortenBegin}{-3.5pt}%
        \renewcommand*{\ShortenEnd}{-3.5pt}%
        \tikzset{Arrow Style/.style={TopArrowStyle}}%
    }%
    \begin{tikzpicture}[overlay,remember picture]
        \draw[
                ->, thick, distance=\ArcDistance,
                shorten <=\ShortenBegin, shorten >=\ShortenEnd,
                out=\OutAngle, in=\InAngle, Arrow Style, #2
            ] 
                ($(#3.\AnchorPoint)+(2.0*\XShift,0)$) to 
                ($(#4.\AnchorPoint)+(0.4*\XShift,0)$);
    \end{tikzpicture}%
}

\begin{document}
\tikzset{BottomArrowStyle/.style={thin, -stealth}}% change arrow style
10.\tikzmark{Three}{5}\tikzmark{Two}{6}\tikzmark{One}{6}%
\DrawArrow*[red]{One}{One}%
\DrawArrow*[brown]{Two}{Two}%
\DrawArrow*[blue]{Three}{Three}%
%
\hspace*{0.25cm}%
%
\tikzset{BottomArrowStyle/.style={thin, stealth-}}% change arrow style
10.\tikzmark{Three}{5}\tikzmark{Two}{6}\tikzmark{One}{6}%
\DrawArrow*[olive]{One}{One}%
\DrawArrow*[green]{Two}{Two}%
\DrawArrow*[magenta]{Three}{Three}%
\tikzset{BottomArrowStyle/.style={}}% restore to default

\bigskip
10.\tikzmark{ThreeB}{5}\tikzmark{TwoB}{6}\tikzmark{OneB}{6}%
\DrawArrow*[red]{OneB}{OneB}%
\DrawArrow[brown]{TwoB}{TwoB}%
\DrawArrow*[blue]{ThreeB}{ThreeB}%
%
\hspace*{0.25cm}%
%
10.\tikzmark{ThreeB}{5}\tikzmark{TwoB}{6}\tikzmark{OneB}{6}%
\DrawArrow*[olive,<-]{OneB}{OneB}%
\DrawArrow[green,<-]{TwoB}{TwoB}%
\DrawArrow*[magenta,->]{ThreeB}{ThreeB}%

\bigskip
10.\tikzmark{Three}{5}\tikzmark{Two}{6}\tikzmark{One}{6}%
\DrawArrow*[red,in=-85, out=-95, distance=0.2cm]{One}{Three}%
%
\hspace*{0.25cm}%
%
10.\tikzmark{Three}{5}\tikzmark{Two}{6}\tikzmark{One}{6}%
\DrawArrow*[magenta,in=-85, out=-95, distance=0.2cm, <-]{One}{Three}%
\end{document}

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