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PGFPlots：使条形图中的条形在条形顶部共享值

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PGFPlots：使条形图中的条形在条形顶部共享值

我有一个 PGF 条形图：

\documentclass[]{standalone}
\usepackage{pgfplots}

\begin{document}
\begin{tikzpicture}
    \centering
    \begin{axis}[
        ybar, axis on top,
        bar width=0.4cm,
        ymax=30,
        width=5.8cm,
        ymajorgrids, tick align=inside,
        major grid style={draw=white},
        enlarge y limits={value=.1,upper},
        ymin=0, 
        tickwidth=0pt,
        enlarge x limits=0.23,
        legend style={
            at={(0.5,-0.2)},
            anchor=north,
            legend columns=-1,
            /tikz/every even column/.append style={column sep=0.5cm}
        },
        yticklabels={,,},
        x tick label style={font=\scriptsize,text width=1.5cm,align=center},
        symbolic x coords={
            Traditional,
            Optimized,
        CBOR encoded},
        xtick=data,
        nodes near coords={
            \pgfmathprintnumber[precision=2]{\pgfplotspointmeta}
        }
        ]
        \addplot [draw=none, fill=yellow!30] coordinates {
            (Traditional, 27.77)
            (Optimized, 26.43)
            (CBOR encoded, 18.51)
        };
        \addplot [draw=none,fill=yellow!50] coordinates {
            (Traditional, 27.77)
            (Optimized, 23.14)
            (CBOR encoded, 13.88)
        };
        \legend{Client, Master}
    \end{axis}
\end{tikzpicture}

\end{document}

看起来像这样：

前

显然，前两个条形图重叠的情况看起来不太好，因为它们共享相同的值（27.77）

我怎样才能让它们共享一个值，像这样？（通过编辑 PDF 实现）

后

请注意，我不想编辑 PDF，因为我希望图表在不同的文档格式之间兼容。

答案1

通过添加单独的节点并使用以下方法修复\usetikzlibrary{calc}：

\documentclass[]{standalone}
\usepackage{pgfplots}
\usetikzlibrary{calc}
\begin{document}
\begin{tikzpicture}
    \centering
    \begin{axis}[
        ybar, axis on top,
        bar width=0.4cm,
        ymax=30,
        width=5.8cm,
        ymajorgrids, tick align=inside,
        major grid style={draw=none},
        enlarge y limits={value=.1,upper},
        ymin=0,
        tickwidth=0pt,
        enlarge x limits=0.23,
        legend style={
            at={(0.5,-0.2)},
            anchor=north,
            legend columns=-1,
            /tikz/every even column/.append style={column sep=0.5cm}
        },
        yticklabels={,,},
        x tick label style={font=\scriptsize,text width=1.5cm,align=center},
        symbolic x coords={
            Traditional,
            Optimized,
        CBOR encoded},
        xtick=data,
        % nodes near coords={
        %     \pgfmathprintnumber[precision=2]{\pgfplotspointmeta}
        % }
        ]
        \addplot [draw=none, fill=yellow!30] coordinates {
            (Traditional, 27.77)
            (Optimized, 26.43)
            (CBOR encoded, 18.51)
        };
        \addplot [draw=none,fill=yellow!50] coordinates {
            (Traditional, 27.77)
            (Optimized, 23.14)
            (CBOR encoded, 13.88)
        };
        \node[above] at ($(axis cs:Traditional,27.77)+(0,0)$) {27.77};
        \node[above] at ($(axis cs:Optimized,26.43)+(-17,0)$) {26.43};
        \node[above] at ($(axis cs:Optimized,23.14)+(17,0)$) {23.14};
        \node[above] at ($(axis cs:CBOR encoded,18.51)+(-17,0)$) {18.51};
        \node[above] at ($(axis cs:CBOR encoded,13.88)+(17,0)$) {13.88};
        \legend{Client, Master}
    \end{axis}
\end{tikzpicture}

\end{document}

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