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为什么它不居中？

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为什么它不居中？

谁能告诉我为什么以下脚本在图的左侧有非零边距？？？

\documentclass[class=minimal,border=0pt]{standalone}

\usepackage{tikz}
\usetikzlibrary{shapes,arrows}

\begin{document}

% Define block styles
\tikzstyle{block} = [rectangle, draw, line width=0.5mm, black, 
    text width=5em, text centered, rounded corners, minimum height=2em]
\tikzstyle{line} = [draw, -latex]

\begin{tikzpicture}[node distance = 1cm, auto]
    % Place nodes
    \node [block] (BLOCK1) {a};
    \node [block, below of=BLOCK1] (BLOCK2) {b};
    \node [block, below of=BLOCK2, node distance=1cm] (BLOCK3) {c};
    % Draw edges
    \path [line] (BLOCK1) -- (BLOCK2);
    \path [line] (BLOCK2) -- (BLOCK3);
\end{tikzpicture}

\end{document}

答案1

您的代码在使用后产生了虚假空格]（\tikzstyle顺便说一下，这已被弃用）

%您可以在这些内容之后添加]，或者按照我的建议将这些定义移出序言。

minimal此外，也不建议使用该类，这就是我更改class=minimal为class=article（默认）的原因。

参考

代码

\documentclass[class=article,border=0pt]{standalone}

\usepackage{tikz}
\usetikzlibrary{shapes,arrows}

% Define block styles
\tikzset{
    block/.style={rectangle, draw, line width=0.5mm, black, text width=5em, text centered, rounded corners, minimum height=2em},
    line/.style={draw, -latex}
}% <- if you insist in using this in the document add this % here.
\begin{document}
\begin{tikzpicture}[node distance = 1cm, auto]
    % Place nodes
    \node [block] (BLOCK1) {a};
    \node [block, below of=BLOCK1] (BLOCK2) {b};
    \node [block, below of=BLOCK2, node distance=1cm] (BLOCK3) {c};
    % Draw edges
    \path [line] (BLOCK1) -- (BLOCK2);
    \path [line] (BLOCK2) -- (BLOCK3);
\end{tikzpicture}
\end{document}

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