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pgfkey 设置条形图中负值的锚点

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pgfkey 设置条形图中负值的锚点

我有一个 ybar 图表，其中有正条和负条以及“节点附近坐标”。我希望将正条的节点放在顶部，将负条的节点放在底部/条下方。使用以下 if-case，我可以解决负条的问题，但我找不到正确的 pgfkey 或其他任何东西来更改锚点以获得底部位置。我希望你能想出一个简单的解决方案。
非常感谢！

\documentclass{article}
\usepackage{pgfplots,lipsum}  
\usepackage{tikz}  

\pgfplotsset{%  
  /pgfplots/ybar legend/.style={  
   /pgfplots/legend image code/.code={%  
     \draw[##1,/tikz/.cd,bar width=6pt,yshift=-0.14cm,bar shift=0pt]  
     plot coordinates {(0cm,0.35cm)};}  
  }}  
\pgfplotsset{compat=newest}  

\begin{document}  

\begin{figure}[H]  
    \centering  
 \begin{tikzpicture}  
  \centering  
  \begin{axis}[small,ybar,   
        height=7.2cm, width=14.5cm,bar width=0.35cm,  
        scaled ticks=false,  
        y tick label style={/pgf/number format/.cd,fixed,fixed   zerofill,precision=3,/tikz/.cd},  
        ymin=-0.016, ymax=0.056,ymajorgrids,tick align=inside,axis y line=left,  
        ylabel={[dimless]},  
        xtick=data,enlarge x limits=0.25,axis x line*=bottom,major x tick style = transparent,  
        symbolic x coords={$A$,$B$,$C$},  
        every node near coord/.append style={rotate=90,anchor=west, font=\scriptsize, xshift=-3pt, yshift=0pt},  
            nodes near coords={%  
        \pgfkeys{/pgf/fpu=true}%  
        \pgfmathparse{\pgfplotspointmeta<0}%  
        \pgfmathfloattofixed{\pgfmathresult}%  
        \pgfkeys{/pgf/fpu=false}%  
        \ifdim\pgfmathresult pt=1pt  
             \pgfkey{anchor={east}} % <<<<<<<<<<<<< What's the right pgfkey to set the anchor?  
        \else   
            \pgfmathprintnumber[fixed,fixed zerofill,precision=3,print sign]{\pgfplotspointmeta}       
        \fi  
        },  
        legend style={draw=none,draw opacity=0, at={(0.5,-0.1)},anchor=north, legend columns=5, transpose legend, font=\small,  
            /tikz/every even column/.append style={column sep=0.15cm}}  
    ]  
    \addplot [draw=none, fill=red] coordinates {  
      ($A$,-0.012)  
      ($B$,+0.000)   
      ($C$,+0.024) };  
   \legend{ABC}  
  \end{axis}  
  \end{tikzpicture}  
\end{figure}  

\end{document}

答案1

您正在寻找nodes near coords align参数。我附上一个例子。

\documentclass{article}
\pagestyle{empty}
\usepackage{pgfplots,lipsum}  
\usepackage{tikz}  

\pgfplotsset{%  
  /pgfplots/ybar legend/.style={  
   /pgfplots/legend image code/.code={%  
     \draw[##1,/tikz/.cd,bar width=6pt,yshift=-0.14cm,bar shift=0pt]  
     plot coordinates {(0cm,0.35cm)};}  
  }}  
\pgfplotsset{compat=newest}  

\begin{document}  

\begin{figure}[H]  
    \centering  
 \begin{tikzpicture}  
  \centering  
  \begin{axis}[small,ybar,   
        height=7.2cm, width=14.5cm,bar width=0.35cm,  
        scaled ticks=false,  
        y tick label style={/pgf/number format/.cd,fixed,fixed   zerofill,precision=3,/tikz/.cd},  
        ymin=-0.016, ymax=0.056,ymajorgrids,tick align=inside,axis y line=left,  
        ylabel={[dimless]},  
        xtick=data,enlarge x limits=0.25,axis x line*=bottom,major x tick style = transparent,  
        symbolic x coords={$A$,$B$,$C$},  
        nodes near coords align={horizontal},
        every node near coord/.append style={rotate=90, 
 font=\scriptsize, xshift=-3pt, yshift=0pt},  
            nodes near coords={%  
            \pgfmathprintnumber[fixed,fixed zerofill,precision=3,print sign]{\pgfplotspointmeta}       
        },  
        legend style={draw=none,draw opacity=0, at={(0.5,-0.1)},anchor=north, legend columns=5, transpose legend, font=\small,  
            /tikz/every even column/.append style={column sep=0.15cm}}  
    ]  
    \addplot [draw=none, fill=red] coordinates {  
      ($A$,-0.012)  
      ($B$,+0.000)   
      ($C$,+0.024) };  
   \legend{ABC}  
  \end{axis}  
  \end{tikzpicture}  
\end{figure}  

\end{document}

姆韦

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