pgfplot 条形图上的两组标签

Question

我想要另一组硬编码标签，它们位于每个条形图顶部，靠近底部（0）。即，像标签一样nodes near coords，但向下移动到 0 处并使用我自己的自定义文本。因此，在下面的示例中，将有另外四个标签（未显示）。有没有简单的方法可以做到这一点？谢谢！

梅威瑟：

\documentclass[border=10pt]{standalone}
\usepackage{tikz}
\usepackage{pgfplotstable}
\renewcommand*{\familydefault}{\sfdefault}
\usepackage{sfmath}

\pgfplotsset{compat=1.12}
\pgfplotsset{
    width=\textwidth,
}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
ybar,axis on top, ymax=100,
ymin=30,
height=8cm,
width=5cm,
enlarge x limits=0.5,
ymajorgrids, tick align=inside,
major grid style={draw=white},
axis x line*=left,
ylabel={\%},
xtick=data,
legend cell align=left,
max space between ticks=20pt,
legend style={ at={(0.57,1.05)} ,
                column sep=1ex },
symbolic x coords={label1, label2},
nodes near coords=\rotatebox{90}{\scriptsize\pgfmathprintnumber\pgfplotspointmeta},
]
 \addplot[draw=none,fill=blue!40!white] coordinates      {(label1,80.2)      (label2,90.7)   }; 
 \addplot[draw=none,fill=red!40!white] coordinates      {(label1,70)      (label2,80) }; 

\legend{Data1, Data2}
\end{axis}
\end{tikzpicture}

\end{document}

Answer 1

以下适用于两个数据系列。想法是在每个 x 值下方添加两个标签，一个在左侧（anchor=east），一个在右侧（anchor=west）。x 位置取自系统symbolic x coordinates，y 坐标取自xticklabel cs位于 x 轴上的 。如果我们只是将相应的\node命令放入轴环境中，它将被剪掉。该选项\after end axis/.code允许指定在剪掉后要执行的代码。

\begin{tikzpicture}
\begin{axis}[
ybar,axis on top, ymax=100,
ymin=30,
height=8cm,
width=5cm,
enlarge x limits=0.5,
ymajorgrids, tick align=inside,
major grid style={draw=white},
axis x line*=left,
ylabel={\%},
xtick=data,
legend cell align=left,
max space between ticks=20pt,
legend style={ at={(0.57,1.05)} ,
                column sep=1ex },
symbolic x coords={label1, label2},
nodes near coords=\rotatebox{90}{\scriptsize\pgfmathprintnumber\pgfplotspointmeta},
after end axis/.code={
\node(L1) at (axis cs:label1,1) {};
\node(L2) at (axis cs:label2,1) {};
\node(XTL) at (xticklabel cs:0)  {};
\node[anchor=north east] at (L1 |- XTL) {L11};
\node[anchor=north west] at (L1 |- XTL) {L12};
\node[anchor=north east] at (L2 |- XTL) {L21};
\node[anchor=north west] at (L2 |- XTL) {L22};
},
]
 \addplot[draw=none,fill=blue!40!white] coordinates      {(label1,80.2)      (label2,90.7)   }; 
 \addplot[draw=none,fill=red!40!white] coordinates      {(label1,70)      (label2,80) }; 

\legend{Data1, Data2}
\end{axis}
\end{tikzpicture}

编辑：x 轴上方的标签

我多读了，你希望将标签放在 xaxis 上方。这可以通过对上述代码进行以下更改来实现：

after end axis/.code={
\node(L1) at (axis cs:label1,1) {};
\node(L2) at (axis cs:label2,1) {};
\node(XTL) at (xticklabel* cs:0)  {};
\node[anchor=south east] at (L1 |- XTL) {\rotatebox{90}{\scriptsize L11}};
\node[anchor=south west] at (L1 |- XTL) {\rotatebox{90}{\scriptsize L12}};
\node[anchor=south east] at (L2 |- XTL) {\rotatebox{90}{\scriptsize L21}};
\node[anchor=south west] at (L2 |- XTL) {\rotatebox{90}{\scriptsize L22}};
},