使用 tikzstyle 创建子流程框

Question

我发现本指南介绍如何使用 tizk 制作流程图，但没有子流程框的选项。

我怎样才能创建一个这样的盒子，让文字位于内部的两行之间？

提前致谢！ ：）

编辑： 到目前为止，我得到的最接近的结果是

\tikzstyle{subprocess} = [rectangle, minimum width=3cm, minimum height=1cm, text centered, draw=black, fill=orange!30, double distance=

\node (subpro1) [subprocess, below of=start] {Failed subprocess box};

但这会产生 2 行每一个而我希望只在两个垂直边上画双线。它还会将彩色背景仅放在内侧，而我希望它位于最外侧的矩形上。

Answer 1

\documentclass[tikz, margin=3mm]{standalone}
     \newcommand\ppbb{path picture bounding box}

\begin{document}
    \begin{tikzpicture}[ 
subprocess/.style = {rectangle, draw=black, fill=orange!30,
                     minimum width=3cm, minimum height=1cm,inner xsep=3mm,
                     text width =\pgfkeysvalueof{/pgf/minimum width}-2*\pgfkeysvalueof{/pgf/inner xsep},
                     align=flush center,
                     path picture={\draw 
    ([xshift =2mm] \ppbb.north west) -- ([xshift= 2mm] \ppbb.south west)
    ([xshift=-2mm] \ppbb.north east) -- ([xshift=-2mm] \ppbb.south east);
                                  },% end of path picture
                    }
                      ]
\node (subpro1) [subprocess] {Failed subprocess box};
    \end{tikzpicture}
\end{document}

附录（1）： 您的样式subprocess可以如下\tikzset：

\tikzset{
    subprocess/.style = {rectangle, draw=black, fill=orange!30,
                         minimum width=3cm, minimum height=1cm, inner xsep=3mm,
                         text width =\pgfkeysvalueof{/pgf/minimum width}-2*\pgfkeysvalueof{/pgf/inner xsep},
                         align=flush center,
                         path picture={\draw 
        ([xshift =2mm] \ppbb.north west) -- ([xshift= 2mm] \ppbb.south west)
        ([xshift=-2mm] \ppbb.north east) -- ([xshift=-2mm] \ppbb.south east);
                                      },% end of path picture
                        }
}

并将其放在文档的序言中。

附录（2）： 如果您希望仅在一行上显示文本，则代码subprocess可以简化为：

\documentclass[tikz, margin=3mm]{standalone}
     \newcommand\ppbb{path picture bounding box}
\tikzset{
subprocess/.style = {rectangle, draw=black, fill=orange!30,
                     minimum width=3cm, minimum height=1cm, inner xsep=3mm,
                     align=flush center,
                     path picture={\draw
    ([xshift =2mm] \ppbb.north west) -- ([xshift= 2mm] \ppbb.south west)
    ([xshift=-2mm] \ppbb.north east) -- ([xshift=-2mm] \ppbb.south east);
                                  },% end of path picture
                    }
        }% end of tikzset

\begin{document}
    \begin{tikzpicture}
\node (subpro1) [subprocess] {Failed subprocess box};
    \end{tikzpicture}
\end{document}

附录（3）： 如果您希望手动规定形状的“最小/最大宽度”，那么以下示例可能会对您有所帮助：

\documentclass[tikz, margin=3mm]{standalone}
\usetikzlibrary{positioning}

     \newcommand\ppbb{path picture bounding box}
\tikzset{
subprocess/.style = {rectangle, draw=black, semithick, fill=orange!30,
                     minimum width=#1, minimum height=1cm, inner xsep=3mm, % <-- changed
                     text width =\pgfkeysvalueof{/pgf/minimum width}-2*\pgfkeysvalueof{/pgf/inner xsep},
                     align=flush center,
                     path picture={\draw
    ([xshift =2mm] \ppbb.north west) -- ([xshift= 2mm] \ppbb.south west)
    ([xshift=-2mm] \ppbb.north east) -- ([xshift=-2mm] \ppbb.south east);
                                  },% end of path picture
                    },
subprocess/.default = 24mm % <-- added 
        }% end of tikzset

\begin{document}
    \begin{tikzpicture}
\node (subpro1) [subprocess] {subprocess};% <-- use default width
\node (subpro2) [subprocess=33mm, below=of subpro1] {very long subprocess};% <-- use locally prescribed width
\node (subpro3) [subprocess=44mm, below=of subpro2] {very long subprocess};% <-- use locally prescribed width
\draw   (subpro1) edge[->] (subpro2)
        (subpro2) edge[->] (subpro3);
    \end{tikzpicture}
\end{document}