如何自定义此流程图的箭头？

Question

\begin{document}
\pagestyle{empty}
  % Define block styles
 \tikzstyle{decision} = [diamond, draw, fill=white!20, 
text width=5.5em, text badly centered, node distance=5cm, inner sep=0pt]
 \tikzstyle{block} = [rectangle, draw, fill=white!20, 
text width=5em, text centered, rounded corners, minimum height=4em]
\tikzstyle{line} = [draw, -latex']
\tikzstyle{cloud} = [draw, ellipse,fill=red!20, node distance=5cm,
minimum height=5em]

 \begin{tikzpicture}[node distance = 4cm, auto]
% Place nodes
\node [block] (sume) {1.-Sume variables de holgura (forma estándar)};
\node [block, below of=sume] (calcu) {2.-Calcule una primer solución básica factible};
\node [decision, below of=calcu] (decide) {3.-¿Existe una solución básica factible adyacente que sea mejor?};
\node [block, right of=decide, node distance=5cm] (no) {5.-Entonces la solucion basica factible actual es óptima};
\node [block, left of=decide, node distance=5cm] (yes) {4.-Entonces calcule el valor de la funcion $Z$ para la nueva solucion básica factible};


% Draw edges
\path [line] (sume) -- (calcu);
\path [line] (calcu) -- (decide);    
\path [line] (decide) -- node {Si} (yes);
\path [line] (yes) -| (calcu);    
\path [line] (decide) -- node {No} (no);

\end{tikzpicture}


\end{document}

这是我第一次在 Latex 中创建流程图，到目前为止，结果看起来很糟糕。有人能帮我让它看起来与我拥有的图像相似吗？

1. 这是我所做的结果，问题是从 4 到 2 的箭头是翻转的，我该如何解决这个问题
2. 什么指令会使箭头看起来更粗？

Answer 1

这就是您所寻求的吗？

1. 问题是从 4 到 2 的箭头是翻转的，我该如何解决这个问题

   \path [line] (yes.west) --+(-1cm,0) |- (h); %从(yes.west)左边 1cm 处绘制，然后垂直向上和水平移动到(h)代码用来node定义的位置(h)

2. 什么指令可以让箭头看起来更粗？修改linetizstyle 中定义的样式以添加thick、 或very thick或line width=xx pt

3. 请检查应该使用 \tikzset 还是 \tikzstyle 来定义 TikZ 样式？

4. 如果你对如何让箭头看起来更粗有疑问，那么请检查是否可以更改 TikZ/PGF 中箭头的大小？

得到下面的图像

代码

\documentclass[tikz,border=1cm]{standalone}
\usetikzlibrary{matrix, shapes, arrows,calc, positioning}

\begin{document}
\pagestyle{empty}
  % Define block styles
 \tikzstyle{decision} = [diamond, draw, fill=white!20, 
text width=3cm, text badly centered, node distance=5cm, inner sep=0pt]
 \tikzstyle{block} = [rectangle, draw, fill=white!20, 
text width=3cm, text centered, rounded corners, minimum height=4em]
\tikzstyle{line} = [draw, -latex']
\tikzstyle{cloud} = [draw, ellipse,fill=red!20, node distance=3cm,
minimum height=5em]

 \begin{tikzpicture}[node distance = 4cm, auto]
% Place nodes
\node [block] (sume) {1.-Sume variables de holgura (forma estándar)};
\node [block, below of=sume] (calcu) {2.-Calcule una primer solución básica factible};
\node [decision, below of=calcu] (decide) {3.-¿Existe una solución básica factible adyacente que sea mejor?};
\node [block, below right =1cm and 1 cm of decide, node distance=5cm] (no) {5.-Entonces la solucion basica factible actual es óptima};
\node [block, below left = 1cm and 1cm of decide, node distance=5cm] (yes) {4.-Entonces calcule el valor de la funcion $Z$ para la nueva solucion básica factible};


% Draw edges
\path [line] (sume) -- (calcu);
\path [line] (calcu) --node[pos=0.5](h){} (decide);    
\path [line] (decide) -| node[pos=0.2,above] {Si} (yes);
\path [line] (yes.west) --+(-1cm,0) |- (h);    
\path [line] (decide) -| node[pos=0.2,above] {No} (no);

\end{tikzpicture}


\end{document}