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流程图中的左上箭头

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流程图中的左上箭头

我无法绘制从底部开始，分别向左、向上、向右的箭头。我的问题是如何在流程图中添加该箭头。以下是 TeX 代码：

\documentclass[11pt,a4paper,oneside]{article}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{graphicx}
\usepackage{siunitx}
\usepackage[a4paper,left=3cm,right=2cm,top=2.5cm,bottom=2.5cm]{geometry}
\usepackage{tikz}
\usetikzlibrary{patterns}
\usepackage{caption}
\usetikzlibrary{arrows}
\usepackage{color}
\usepackage[colorlinks]{hyperref}
\usepackage{pgfplots}
\usepackage{listings}
\usepackage[utf8]{inputenc}
\usetikzlibrary{shapes.geometric}

\begin{document}
\section*{Flowchart}
\tikzstyle{startstop} = [rectangle, rounded corners, minimum width=3cm,minimum height=1cm,text centered, draw=black, fill=red!30]
\tikzstyle{io} = [trapezium, trapezium left angle=70, trapezium right angle=110, minimum width=3cm, minimum height=1cm, text centered, text width=3cm, draw=black, fill=blue!30]
\tikzstyle{process} = [rectangle, minimum width=3cm, minimum height=1cm, text centered, text width=3cm, draw=black, fill=orange!30]
\tikzstyle{decision} = [diamond, minimum width=3cm, minimum height=1cm, text centered, draw=black, fill=green!30]
\tikzstyle{arrow} = [thick,->,>=stealth]

\begin{tikzpicture}[node distance=2cm]
\node (start) [startstop] {Başla};
\node (pro1) [process, below of=start, yshift=+0.2cm] {$\rho(T)$, $ c_{p}(T)$, $ k(T)$, $\mu(T)$ hesapla};
\node (io1) [io, below of=pro1] {$T_{g}=\SI{29}{\celsius}$, $T_{f}=\SI{31}{\celsius}$, $T_{w}=\SI{35}{\celsius}$ };
\node (pro2) [process, below of=io1, yshift=-0.2cm] {$h_{r,w-g}$, $Pr_{gf}$, $Pr_{wr}$, $Gr_{gf}$, $Gr_{wr}$, $Ra_{gf}$, $Ra_{wr}$ hesapla};
\node (dec1) [decision, below of=pro2, yshift=-1cm] {$Ra_{L}\leq10^{9}$};
\node (pro2a) [process, below of=dec1, yshift=-0.5cm] {$Nu_{gf}$, $Nu_{wr}$, $h_{g}$, $h_{w}$, $h_{r}$, $U_{t}$, $U_{b}$ hesapla};
\node (pro2b) [process, right of=dec1, xshift=2cm] {$Nu_{gf}$, $Nu_{wr}$, $h_{g}$, $h_{w}$, $h_{r}$, $U_{t}$, $U_{b}$ hesapla};
\node (pro3a) [process, below of=pro2a] {AX=B matrisini oluştur ve çöz};
\node (stop) [startstop, below of=pro3a] {Stop};
% Arrows
\draw [arrow] (start) -- (pro1);
\draw [arrow] (pro1) -- (io1);
\draw [arrow] (io1) -- (pro2);
\draw [arrow] (pro2) -- (dec1);
\draw [arrow] (dec1) -- node[anchor=east] {evet} (pro2a);
\draw [arrow] (dec1) -- node[anchor=south] {hayır} (pro2b);
\draw [arrow] (pro2b) |- (pro3a);
\draw [arrow] (pro2a) -- (pro3a);
\draw [arrow] (pro3a) -| (io1);
\draw [arrow] (pro3a) -- (stop);
\end{tikzpicture}
\end{document}

这是我想要添加的箭头。

答案1

您可以在该路径左侧包含另一个点pro3a：

\documentclass[11pt,a4paper,oneside]{article}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{graphicx}
\usepackage{siunitx}
\usepackage[a4paper,left=3cm,right=2cm,top=2.5cm,bottom=2.5cm]{geometry}
\usepackage{tikz}
\usetikzlibrary{patterns}
\usepackage{caption}
\usetikzlibrary{arrows}
\usepackage{color}
\usepackage[colorlinks]{hyperref}
\usepackage{pgfplots}
\usepackage{listings}
\usepackage[utf8]{inputenc}
\usetikzlibrary{shapes.geometric}

\begin{document}
\section*{Flowchart}
\tikzstyle{startstop} = [rectangle, rounded corners, minimum width=3cm,minimum height=1cm,text centered, draw=black, fill=red!30]
\tikzstyle{io} = [trapezium, trapezium left angle=70, trapezium right angle=110, minimum width=3cm, minimum height=1cm, text centered, text width=3cm, draw=black, fill=blue!30]
\tikzstyle{process} = [rectangle, minimum width=3cm, minimum height=1cm, text centered, text width=3cm, draw=black, fill=orange!30]
\tikzstyle{decision} = [diamond, minimum width=3cm, minimum height=1cm, text centered, draw=black, fill=green!30]
\tikzstyle{arrow} = [thick,->,>=stealth]

\begin{tikzpicture}[node distance=2cm]
\node (start) [startstop] {Başla};
\node (pro1) [process, below of=start, yshift=+0.2cm] {$\rho(T)$, $ c_{p}(T)$, $ k(T)$, $\mu(T)$ hesapla};
\node (io1) [io, below of=pro1] {$T_{g}=\SI{29}{\celsius}$, $T_{f}=\SI{31}{\celsius}$, $T_{w}=\SI{35}{\celsius}$ };
\node (pro2) [process, below of=io1, yshift=-0.2cm] {$h_{r,w-g}$, $Pr_{gf}$, $Pr_{wr}$, $Gr_{gf}$, $Gr_{wr}$, $Ra_{gf}$, $Ra_{wr}$ hesapla};
\node (dec1) [decision, below of=pro2, yshift=-1cm] {$Ra_{L}\leq10^{9}$};
\node (pro2a) [process, below of=dec1, yshift=-0.5cm] {$Nu_{gf}$, $Nu_{wr}$, $h_{g}$, $h_{w}$, $h_{r}$, $U_{t}$, $U_{b}$ hesapla};
\node (pro2b) [process, right of=dec1, xshift=2cm] {$Nu_{gf}$, $Nu_{wr}$, $h_{g}$, $h_{w}$, $h_{r}$, $U_{t}$, $U_{b}$ hesapla};
\node (pro3a) [process, below of=pro2a] {AX=B matrisini oluştur ve çöz};
\node (stop) [startstop, below of=pro3a] {Stop};
% Arrows
\draw [arrow] (start) -- (pro1);
\draw [arrow] (pro1) -- (io1);
\draw [arrow] (io1) -- (pro2);
\draw [arrow] (pro2) -- (dec1);
\draw [arrow] (dec1) -- node[anchor=east] {evet} (pro2a);
\draw [arrow] (dec1) -- node[anchor=south] {hayır} (pro2b);
\draw [arrow] (pro2b) |- (pro3a);
\draw [arrow] (pro2a) -- (pro3a);
\draw [arrow] (pro3a) -- +(-4,0) |- (io1);
\draw [arrow] (pro3a) -- (stop);
\end{tikzpicture}
\end{document}

在此处输入图片描述

答案2

两年后，题外话，使用最近的tikz样式语法，为了有趣和练习：


\documentclass[11pt,a4paper,oneside]{article}
\usepackage[a4paper,left=3cm,right=2cm,top=2.5cm,bottom=2.5cm]{geometry}

\usepackage{amsmath, bm}
\usepackage{listings}
\usepackage{graphicx}
\usepackage{siunitx}
\usepackage{caption}

\usepackage{pgfplots}
\pgfplotsset{compat=1.17}
\usetikzlibrary{arrows.meta,
                chains,
                positioning,
                quotes,
                shapes.geometric}

\usepackage[colorlinks]{hyperref} % had to be loaded last
\makeatletter
\tikzset{FlowChart/.style={
     base/.style = {draw, rounded corners,
                    minimum width=32mm, minimum height=11mm, align=center,
                    on chain, join=by arr},
startstop/.style = {base, fill=red!30},
  process/.style = {base, fill=orange!30,
                    text width=54mm},
 decision/.style = {diamond, aspect=1.3, draw, fill=green!30,
                    minimum width=3cm, minimum height=1cm, align=center,
                    on chain, join=by arr},
       io/.style = {trapezium, trapezium stretches body,
                    trapezium left angle=70, trapezium right angle=110,
                    draw, fill=blue!30,
                    minimum width=54mm, minimum height=1cm,
                    text width =\pgfkeysvalueof{/pgf/minimum width}-2*\pgfkeysvalueof{/pgf/inner xsep},
                    align=center,
                    on chain, join=by arr},
      arr/.style = {draw, semithick, -Triangle},
suspend join/.code = {\def\tikz@after@path{}}
        }   }
\makeatother

\begin{document}
\section*{Flowchart}

    \begin{tikzpicture}[FlowChart, auto,
    node distance = 5mm and 17mm,
      start chain = A going below
                        ]
\node (start) [startstop] {Başla};
\node (pro1)  [process] {$\rho(T)$, $ c_{p}(T)$, $ k(T)$, $\mu(T)$ hesapla};
\node (io1)   [io] {$\begin{aligned}    
                        T_{g} & = \SI{29}{\celsius}\\[-0.5ex] 
                        T_{f} & = \SI{31}{\celsius}\\[-0.5ex] 
                        T_{w} & = \SI{35}{\celsius}
                     \end{aligned}$ };
\node (pro2)  [process] {$h_{r,w-g}$, $Pr_{gf}$, $Pr_{wr}$, 
                         $Gr_{gf}$,   $Gr_{wr}$, $Ra_{gf}$, 
                         $Ra_{wr}$ hesapla};
\node (dec1)  [decision] {$Ra_{L}\leq10^{9}$};
\node (pro2a) [process] {$Nu_{gf}$, $Nu_{wr}$, $h_{g}$, $h_{w}$, $h_{r}$, $U_{t}$, $U_{b}$ hesapla};
\node (pro3a) [process] {$\bf{AX}=\bf{B}\quad$\\
                         matrisini oluştur ve çöz};
\node (stop)  [startstop] {Stop};
%
\node (pro2b) [process, suspend join, 
               right= of dec1.east] {$Nu_{gf}$, $Nu_{wr}$, $h_{g}$, 
                                     $h_{w}$,  $h_{r}$,   $U_{t}$, 
                                     $U_{b}$ hesapla};
% Arrows and labels not included in join maro
\draw[arr]  (dec1) to [pos=0.3,"evet"] (pro2a) 
            (dec1) to ["hayır"] (pro2b);
\draw [arr] (pro2b) |- (pro3a);
\draw [arr] (pro3a) -- +(-4,0) |- (io1);
\end{tikzpicture}
\end{document}

在此处输入图片描述

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