如何在图中用坐标在两点之间的正确位置绘制花括号?

如何在图中用坐标在两点之间的正确位置绘制花括号?
\documentclass{article}

\usepackage{tikz}
\usetikzlibrary{decorations.pathreplacing}

\usepackage{pgfplots}
\usepackage{xcolor}

\begin{document}

\begin{center}
    \begin{tikzpicture}
    \begin{axis}[
    xlabel={x},
    ylabel={y},
    xmin=0, xmax=5,
    ymin=0, ymax=8,
    xtick={0,1,2,3,4,5},
    ytick={0,2,4,6,8,10},
    ]


    \addplot[
    only marks,
    color=blue,
    mark=square
    ]
    coordinates {
        (1,2) (2,4) (3,4) (4,6)
    };

    \addplot[no marks,blue] expression[domain=1:4,samples=50]{1.6*x};

    \end{axis}
    \draw [decorate,decoration={brace,amplitude=2pt,mirror}, yshift = -0.2cm]
    (2,4) -- (2,3.2) node (curly_bracket)[black,midway, yshift =- 0.3 cm] 
    {};

    \end{tikzpicture}
\end{center}

\end{document}

我试图在点 (2,4) 和 (2,3.2) 之间绘制一个括号,但无法使用代码将其放在正确的位置

\draw [decorate,decoration={brace,amplitude=2pt,mirror}, yshift = -0.2cm]
        (2,4) -- (2,3.2) node (curly_bracket)[black,midway, yshift =- 0.3 cm] 
        {};

。你可以理解括号表示当 x=2 时线的偏差。任何帮助都非常感谢!

谢谢!

答案1

尝试这个。

\documentclass{article}

\usepackage{tikz}
\usetikzlibrary{decorations.pathreplacing}

\usepackage{pgfplots}
\usepackage{xcolor}

\begin{document}

\begin{center}
    \begin{tikzpicture}
    \begin{axis}[
    xlabel={x},
    ylabel={y},
    xmin=0, xmax=5,
    ymin=0, ymax=8,
    xtick={0,1,2,3,4,5},
    ytick={0,2,4,6,8,10},
    ]


    \addplot[
    only marks,
    color=blue,
    mark=square
    ]
    coordinates {
        (1,2) (2,4) (3,4) (4,6)
    };
    \addplot[no marks,blue] expression[domain=1:4,samples=50]{1.6*x};

\draw [decorate,decoration={brace,amplitude=2pt,mirror}, yshift = -0.2cm]
    (axis cs:2,4) -- (axis cs:2,3.2) node (curly_bracket)[black,midway, yshift =- 0.3 cm] 
    {};
    \end{axis}

    \end{tikzpicture}
\end{center}

\end{document}

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