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pgfplots 条形图中标签的条件对齐

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pgfplots 条形图中标签的条件对齐

我正在尝试使用 pgfplots 制作条形图。我希望​​标签绘制在条形图内，除非空间不足。在这种情况下，标签应显示在条形图旁边。

我添加了一些代码来重现我正在制作的图表。如果百分比低于 3%，则没有足够的空间将节点左对齐。对于这些节点，我希望它右对齐。数据文件 data.dat 将从 latex 外部生成，并且数据值将来可能会有所不同，因此我正在寻找一个通用解决方案。任何帮助都将不胜感激。

\documentclass[a4paper, 9pt]{report}
\usepackage{filecontents} 
\usepackage{pgfplots, pgfplotstable}
\begin{document}
\begin{filecontents}{data.dat}
rownum value value2 label
1 10 1.1 Cluster~A
2 14 6 Cluster~B
3 17 7 Cluster~C
4 15 2.2 Cluster~D
5 19 4 Cluster~E
6 18 11 Cluster~F
\end{filecontents}
\begin{figure}[h]
\caption{A caption.}
\begin{tikzpicture}
  \begin{axis}[
    xbar,
    y dir=reverse,
    axis y line*=none, 
    axis x line*=none,
    major tick length=0,
    xmin=0,
    xmax=50,
    enlarge x limits={abs=0.00005},
    scale only axis, width=10cm,
    ytick={1,...,6},
    xtick={0, 10, ..., 50},
    xticklabel=\pgfmathprintnumber{\tick}\,\%,
    yticklabel style={text width=3cm, align=right},
    yticklabels from table={data.dat}{label},
    xmajorgrids,
    major grid style={black},
    tick style={black},
    bar width=4mm,
    y=12mm, 
    enlarge y limits={abs=0.6}, 
    nodes near coords={\pgfmathprintnumber[precision=0]\pgfplotspointmeta\%},
    nodes near coords align=left
  ]
  \addplot [draw=lime , fill=lime] table [x=value, y=rownum] {data.dat}; 
  \addplot [draw=orange , fill=orange] table [x=value2, y=rownum] {data.dat}; 
  \end{axis}
\end{tikzpicture}
\end{figure}
\end{document}

答案1

您可以使用键检查值是否小于 3 visualization depends on={meta < 3 \as \valueissmall}，然后使用比较的结果设置标签的锚点（请注意使用以及值后的\ifdim需要）：pt

every node near coord/.append style={
    anchor={\ifdim\valueissmall pt=1 pt west\else east\fi}
}


\documentclass[a4paper, 9pt]{report}
\usepackage{filecontents} 
\usepackage{pgfplots, pgfplotstable}
\begin{document}
\begin{filecontents}{data.dat}
rownum value value2 label
1 10 1.1 Cluster~A
2 14 6 Cluster~B
3 17 7 Cluster~C
4 15 2.2 Cluster~D
5 19 4 Cluster~E
6 18 11 Cluster~F
\end{filecontents}
\begin{figure}[h]
\caption{A caption.}
\begin{tikzpicture}
  \begin{axis}[
    xbar,
    y dir=reverse,
    axis y line*=none, 
    axis x line*=none,
    major tick length=0,
    xmin=0,
    xmax=50,
    enlarge x limits={abs=0.00005},
    scale only axis, width=10cm,
    ytick={1,...,6},
    xtick={0, 10, ..., 50},
    xticklabel=\pgfmathprintnumber{\tick}\,\%,
    yticklabel style={text width=3cm, align=right},
    yticklabels from table={data.dat}{label},
    xmajorgrids,
    major grid style={black},
    tick style={black},
    bar width=4mm,
    y=12mm, 
    enlarge y limits={abs=0.6}, 
    nodes near coords={\pgfmathprintnumber[precision=0]\pgfplotspointmeta\%},
    visualization depends on={meta < 3 \as \valueissmall},
    every node near coord/.append style={
            anchor={\ifdim\valueissmall pt=1 pt west\else east\fi}
        }
  ]
  \addplot [draw=lime , fill=lime] table [x=value, y=rownum] {data.dat}; 
  \addplot [draw=orange , fill=orange] table [x=value2, y=rownum] {data.dat}; 
  \end{axis}
\end{tikzpicture}
\end{figure}
\end{document}

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