使用 pgfplots 绘制 LaTeX 箱线图

Question

以下代码中有两个问题。我想将框放在行的中间，并希望显示最大值。任何建议都将不胜感激。谢谢。

  \documentclass{report}
    \usepackage{pgf,pgfplots}

    \usetikzlibrary{fit,calc}
    \usepgfplotslibrary{external}

    \newcommand{\boxplot}[6]{%#max %no change
        %#1: center, #2: median, #3: 1/4 quartile, #4: 3/4 quartile, #5: min, #6: max
        \filldraw[fill=gray!25,line width=0.2mm] let \n{boxxl}={#1-0.4}, \n{boxxr}={#1+0.4} in (axis cs:\n{boxxl},#3) rectangle (axis cs:\n{boxxr},#4);
        % draw the box

        \draw[line width=0.2mm, color=orange] let \n{boxxl}={#1-0.1}, \n{boxxr}={#1+0.1} in (axis cs:\n{boxxl},#2) -- (axis cs:\n{boxxr},#2);
        % median
        \draw[line width=0.2mm,color=blue] (axis cs:#1,#4) -- (axis cs:#1,#6);
        % bar up
        \draw[line width=0.9mm,color=pink] let \n{whiskerl}={#1-0.025}, \n{whiskerr}={#1+0.025} in (axis cs:\n{whiskerl},#6) -- (axis cs:\n{whiskerr},#6);        % upper quartile
        \draw[line width=0.2mm,color=black] (axis cs:#1,#3) -- (axis cs:#1,#5);
        % bar down
        \draw[line width=0.6mm,color=yellow] let \n{whiskerl}={#1-0.025}, \n{whiskerr}={#1+0.025} in (axis cs:\n{whiskerl},#5) -- (axis cs:\n{whiskerr},#5);        % lower quartile
    }


    \begin{document}
    \tikzset{external/remake next}
    \begin{tikzpicture}
    \begin{axis}[
            xmin=0.5, xmax=6, %x level interval
            ymin=1, ymax=100, % y level interval
                    xtick={1,2,3,4,5}, % X level name if not xtick level activate
                    xticklabels={Foo,20,Bar,SVM, DTree} % X level name
                 ]
    %#1: center, #2: median, #3: 1/4 quartile, #4: 3/4 quartile, #5: min, #6: max
    \boxplot{1}{8.5}{55}{69}{20}{35}
    \boxplot{2}{38.5}{55}{59}{40}{35}
    \boxplot{3}{8.5}{55}{29}{20}{35}
    \boxplot{4}{8.5}{55}{59}{20}{35}
    \boxplot{5}{8.5}{55}{89}{20}{35}
    \end{axis}
    \end{tikzpicture}
    \end{document}

代码图片