即使文本大小发生变化，如何固定矩形大小？

Question

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{positioning, shapes.geometric}
\tikzstyle{arrow} = [thick,->,>=stealth]
\begin{document}
\begin{tikzpicture}[node distance=10pt]
  \node[draw, rounded corners, align=center, fill=blue!20, fill opacity=0.6, minimum width=2cm,minimum height=1cm]                        (start)   {\textbf{unknown}};

  \node[draw, below=of start, align=center, fill=blue!40, fill opacity=0.7, minimum width=3cm,minimum height=1cm]                        (step 1)   {\textbf{My name in Alice}\\$A+B$};

  \node[draw, below=of step 1, align=center, fill=blue!40, fill opacity=0.7, minimum width=3cm,minimum height=1cm]                        (step 2)   {\textbf{What about you}};


    \node[draw, below=of step 2, align=center, fill=blue!40, fill opacity=0.7, minimum width=3cm,minimum height=1cm]                        (step 3)   {\textbf{Bob}\\ $A+B+C+D$};



  \node[draw, rounded corners, fill=blue!40, fill opacity=0.7, below=20pt of step 3]  (end)     {End};

  \draw[arrow] (start)  -- (step 1);
  \draw[arrow] (step 1) -- (step 2);
  \draw[arrow] (step 2) -- (step 3);
  \draw[arrow] (step 3) -- (end);

\end{tikzpicture}
\end{document} 

您可以看到中间三个矩形的尺寸不同，尽管我已经设置了“最小宽度=2cm，最小高度=1cm”，但是这不起作用，我怎样才能将这些矩形的尺寸固定为相同大小？

Answer 1

• 在节点中，ìnner sep最初是.3333em（文档pgfmanual
• 长度\textbf{My name in Alice}超过3厘米
• 最小尺寸为：长度\textbf{My name in Alice}+2x.3333em

评论：

• \tikzstyle已折旧
• 如果不透明度没有用，我们可以fill=blue!40,fill opacity=0.7用（测试后） 代替fill=blue!29

代码

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{positioning}
%\tikzstyle{arrow} = [thick,->,>=stealth]
\tikzset{
    every node/.style={
        draw,
        align=center,
        minimum height=1cm
    },
    start/.style={      
        rounded corners,
        % fill=blue!30, 
        %fill opacity=0.6,
        fill=blue!19, 
        minimum width=2cm,
    },
    rect/.style={
        % fill=blue!40,
        % fill opacity=0.7,
        fill=blue!29,
        minimum width=3.42cm,
        },
    arrow/.style={
        thick,
        -stealth,
    }
}

\begin{document}
\ExplSyntaxOn
\NewDocumentCommand{\myconversion}{m}{%
    \dim_to_decimal_in_unit:nn { #1 } { 1cm }
}
\ExplSyntaxOff
\newlength{\mylength}
\settowidth \mylength {\textbf{My name in Alice}}
\verb| length of \textbf{My name in Alice} | \myconversion{\the\mylength}

\addtolength \mylength {0.6666em}% the initially inner sep
\verb| length of minimum width |\myconversion{\the\mylength}


\begin{tikzpicture}[node distance=10pt]
    \node[start]                        (start)     {\textbf{unknown}};
    \node[rect, below=of start]         (step 1)    {\textbf{My name in Alice}\\$A+B$};
    \node[rect, below=of step 1,]       (step 2)    {\textbf{What about you}};
    \node[rect, below=of step 2]        (step 3)    {\textbf{Bob}\\ $A+B+C+D$};
    \node[rect,below=20pt of step 3]    (end)       {End};

    \draw[arrow] (start)  -- (step 1);
    \draw[arrow] (step 1) -- (step 2);
    \draw[arrow] (step 2) -- (step 3);
    \draw[arrow] (step 3) -- (end);
\end{tikzpicture}


% test color
% \begin{tikzpicture}[thick]
%     \filldraw[fill=blue!40,fill opacity=0.7] (0:1cm) circle (12mm);
%     \filldraw[fill=blue!29] (0:2cm) circle (12mm);
% \end{tikzpicture}
\end{document}

Answer 2

代码（修复矩形相同的大小）：

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{positioning, shapes.geometric}
\tikzstyle{arrow} = [thick,->,>=stealth]
\begin{document}
    \begin{tikzpicture}[node distance=10pt]
        \node[draw, rounded corners, align=center, fill=blue!20, fill opacity=0.6, minimum width=2cm,minimum height=1cm]                        (start)   {\textbf{unknown}};
        
        \node[draw, below=of start, align=center, fill=blue!40, fill opacity=0.7, minimum width=4cm,minimum height=1.5cm]                        (step 1)   {\textbf{My name in Alice}\\$A+B$};
        
        \node[draw, below=of step 1, align=center, fill=blue!40, fill opacity=0.7, minimum width=4cm,minimum height=1.5cm]                        (step 2)   {\textbf{What about you}};
        
        
        \node[draw, below=of step 2, align=center, fill=blue!40, fill opacity=0.7, minimum width=4cm,minimum height=1.5cm]                        (step 3)   {\textbf{Bob}\\ $A+B+C+D$};
        
        
        
        \node[draw, rounded corners, fill=blue!40, fill opacity=0.7, below=20pt of step 3]  (end)     {End};
        
        \draw[arrow] (start)  -- (step 1);
        \draw[arrow] (step 1) -- (step 2);
        \draw[arrow] (step 2) -- (step 3);
        \draw[arrow] (step 3) -- (end);
        
    \end{tikzpicture}
\end{document}