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带有三个直角的箭头（如路径）

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带有三个直角的箭头（如路径）

谁能帮我画红色箭头？

例子

\documentclass{article}
\pagestyle{empty} % do not print page number
\usepackage{tikz}
\usetikzlibrary{shapes.geometric, arrows}
\pagecolor{white} 

\tikzset {
    startstop/.style={
        circle,
        rounded corners,
        minimum width=1cm,
        minimum height=1cm,
        text centered,
        draw=black!80,
        fill=white!100
    },
    interconnect/.style={
        circle,
        minimum width=0.25cm,
        minimum height=0.25cm,
        draw=black!80,
        fill=white!100
    },
    process/.style={
        rectangle,
        minimum width=3cm,
        minimum height=1cm,
        text centered,
        text width=3cm,
        draw=black!80,
        fill=white!100
    },
    decision/.style={
        diamond,
        minimum width=3cm,
        minimum height=1cm,
        text centered,
        draw=black!80,
        fill=white!100
    },
    % RECTANGULAR CONNECTOR ----------------------------------------------------------------------------
    % from: https://tex.stackexchange.com/questions/50780/arrows-at-right-angles-on-a-tikzpicture-matrix
    descr/.style={
        fill=white,
        inner sep=2.5pt
    },
    connector/.style={
     -latex
    },
    rectangle connector/.style={
        connector,
        to path={(\tikztostart) -- ++(#1,0pt) \tikztonodes |- (\tikztotarget) },
        pos=0.5
    },
    rectangle connector/.default=-2cm,
    straight connector/.style={
        connector,
        to path=--(\tikztotarget) \tikztonodes
    },
    % --------------------------------------------------------------------------------------------------
    arrow/.style={thick,->,>=stealth}
}

\begin{document}

\begin{tikzpicture}[node distance=2cm]

\node (START) [startstop] {Start};
\node (SETUP) [process, below of=START, yshift=0.0cm] {setup()};
\node (CON1) [interconnect, below of=SETUP, yshift=0.25cm] {};
\node (GEN-QUEST) [process, below of=CON1, align=center, yshift=0.25cm] {Generate\\new question};
\node (CON2) [interconnect, below of=GEN-QUEST, yshift=0.25cm] {};
\node (INPUT) [process, below of=CON2, align=center, yshift=0.25cm] {Get user\\input};
\node (LED) [process, below of=INPUT, align=center] {Turn LEDs on/off\\accordingly};
\node (CHECK-ANSWER) [decision, below of=LED, align=center, yshift=-0.75cm] {Correct\\answer?};

\draw [arrow] (START) -- (SETUP);
\draw [arrow] (SETUP) -- (CON1);
\draw [arrow] (CON1) -- (GEN-QUEST);
\draw [arrow] (GEN-QUEST) -- (CON2);
\draw [arrow] (CON2) -- (INPUT);
\draw [arrow] (INPUT) -- (LED);
\draw [arrow] (LED) -- (CHECK-ANSWER);
\draw [rectangle connector=3.5cm] (CHECK-ANSWER) to node[descr] {no} (CON2);

\end{tikzpicture}
\end{document}

答案1

更复杂的代码，它基于 Ti钾Z 库chains和。有了它们positioning，ext.paths.ortho代码变得更短更简洁：

  • 节点以垂直链的形式连接，其中使用宏join通过箭头连接
  • 用于反馈的是ext.paths.ortho库（它是tikz-ext包的一部分）
\documentclass[border=3mm]{standalone}
\usepackage{tikz}
\usetikzlibrary{arrows.meta,
                chains,
                ext.paths.ortho,    % defined in the tikz-ext package
                positioning,
                quotes,
                shapes.geometric}

\tikzset {
     arr/.style = {-Stealth},
    base/.style = {draw=black!80, align=center},
   startstop/.style = {base, circle, minimum size=1cm},
interconnect/.style = {base, circle, minimum size=2.5mm, node contents = {}},
     process/.style = {base, minimum width=3cm, minimum height=1cm},
    decision/.style = {base, diamond, minimum width=3cm, minimum height=1cm},
         lbl/.style = {fill=white, font=\footnotesize, inner sep=2pt, pos=#1}
        }

\begin{document}

    \begin{tikzpicture}[
node distance = 4mm and 12mm,
  start chain = going below
                        ]
    \begin{scope}[nodes={on chain, join=by arr}]
\node (START) [startstop]   {Start};
\node (SETUP) [process]     {setup()};
\node (CON1)  [interconnect];
\node (GEN-QUEST) [process] {Generate\\new question};
\node (CON2)  [interconnect];
\node (LED)   [process]     {Turn LEDs on/off\\accordingly};
\node (CHECK-ANSWER) [decision] {Correct\\answer?};
    \end{scope}
% arrows not included in join macro
\draw[arr] (CHECK-ANSWER) r-rl[rl distance=12mm] (CON2) node[lbl=0.1] {No};
\draw[arr] (CHECK-ANSWER.south) -- ++ (0,-1) node[lbl=0.5] {Yes}
                          r-rl[rl distance=28mm] (CON1);
   \end{tikzpicture}
\end{document}

在此处输入图片描述

答案2

作为现有的变体rectangle connector，您可以定义另一种样式：

double rectangle connector/.style={
    connector,
    to path={(\tikztostart) |- ++(#1) \tikztonodes |- (\tikztotarget)},
    pos=0.25
},
double rectangle connector/.default={2cm,-2cm},

然后添加到您的绘图中：

\draw [double rectangle connector={5cm,-2cm}] (CHECK-ANSWER) to node[descr] {yes} (CON1);

梅威瑟：

\documentclass[border=10pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{shapes.geometric}

\tikzset {
    startstop/.style={
        circle,
        rounded corners,
        minimum width=1cm,
        minimum height=1cm,
        text centered,
        draw=black!80,
        fill=white!100
    },
    interconnect/.style={
        circle,
        minimum width=0.25cm,
        minimum height=0.25cm,
        draw=black!80,
        fill=white!100
    },
    process/.style={
        rectangle,
        minimum width=3cm,
        minimum height=1cm,
        text centered,
        text width=3cm,
        draw=black!80,
        fill=white!100
    },
    decision/.style={
        diamond,
        minimum width=3cm,
        minimum height=1cm,
        text centered,
        draw=black!80,
        fill=white!100
    },
    % RECTANGULAR CONNECTOR ----------------------------------------------------------------------------
    % from: https://tex.stackexchange.com/questions/50780/arrows-at-right-angles-on-a-tikzpicture-matrix
    descr/.style={
        fill=white,
        inner sep=2.5pt
    },
    connector/.style={
        -latex
    },
    rectangle connector/.style={
        connector,
        to path={(\tikztostart) -- ++(#1,0pt) \tikztonodes |- (\tikztotarget)},
        pos=0.5
    },
    rectangle connector/.default=-2cm,
    double rectangle connector/.style={
        connector,
        to path={(\tikztostart) |- ++(#1) \tikztonodes |- (\tikztotarget) },
        pos=0.25
    },
    double rectangle connector/.default={2cm,-2cm},
    straight connector/.style={
        connector,
        to path=--(\tikztotarget) \tikztonodes
    },
    % --------------------------------------------------------------------------------------------------
    arrow/.style={thick, ->, >=stealth}
}

\begin{document}

\begin{tikzpicture}[node distance=2cm]

\node (START) [startstop] {Start};
\node (SETUP) [process, below of=START, yshift=0.0cm] {setup()};
\node (CON1) [interconnect, below of=SETUP, yshift=0.25cm] {};
\node (GEN-QUEST) [process, below of=CON1, align=center, yshift=0.25cm] {Generate\\new question};
\node (CON2) [interconnect, below of=GEN-QUEST, yshift=0.25cm] {};
\node (INPUT) [process, below of=CON2, align=center, yshift=0.25cm] {Get user\\input};
\node (LED) [process, below of=INPUT, align=center] {Turn LEDs on/off\\accordingly};
\node (CHECK-ANSWER) [decision, below of=LED, align=center, yshift=-0.75cm] {Correct\\answer?};

\draw [arrow] (START) -- (SETUP);
\draw [arrow] (SETUP) -- (CON1);
\draw [arrow] (CON1) -- (GEN-QUEST);
\draw [arrow] (GEN-QUEST) -- (CON2);
\draw [arrow] (CON2) -- (INPUT);
\draw [arrow] (INPUT) -- (LED);
\draw [arrow] (LED) -- (CHECK-ANSWER);
\draw [rectangle connector=3.5cm] (CHECK-ANSWER) to node[descr] {no} (CON2);
\draw [double rectangle connector={5cm,-2cm}] (CHECK-ANSWER) to node[descr] {yes} (CON1);

\end{tikzpicture}
\end{document}

在此处输入图片描述

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