我有一个简单的任务，到目前为止我找不到解决方案。我有一个包含 3 个图例条目的图，其中 2 个是短图例，1 个是长图例。我可以使用它legend columns=2,来获取两列图例，但它看起来像这样：
aaaa ________________ bbbb
cccccccccccccccccccccc
我喜欢的是：
aaaa ________ bbbb
cccccccccccccccccccccccccccc
（我将“_”用作空格）
那么，图例中使用的表格多列就类似这样。您知道如何实现吗？
谢谢，阿克塞尔
添加于 12.04.21：
抱歉没有添加提到的最小示例：我准备如下：
\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{graphicx}
\usepackage{xcolor}
\usepackage{tikz}
\usetikzlibrary{decorations, shapes, calc, backgrounds, shadings, arrows.meta, trees, positioning}
\usepackage{pgfplots}
\pgfplotsset{compat=newest}
\begin{document}
\begin{figure}
\centering
\begin{tikzpicture}
\begin{axis}[%
width=.7\textwidth,
scale only axis,
clip = false,
legend columns=2,
legend style={ at={(axis cs:1.5,1.2)},
/tikz/column 2/.style={
column sep=5pt},
anchor=south},
]
\addlegendimage{area legend,fill=red, opacity = 0.5}
\addlegendimage{area legend,fill=gray, opacity = 0.5}
\addlegendimage{area legend,fill=green, opacity = 0.5}
\addplot[area legend, draw=black, fill=gray, fill opacity=0.5, forget plot]
table[row sep=crcr] {%
x y\\
1 0\\
2 0\\
2 1\\
1 1\\
}--cycle;
\node[align=center]
at (axis cs:1.5,0.5) {a};
\addplot[area legend, draw=black, fill=red, fill opacity=0.5, forget plot]
table[row sep=crcr] {%
x y\\
0 0\\
1 0\\
1 1\\
0 1\\
}--cycle;
\node[align=center]
at (axis cs:0.5,0.5) {b};
\addplot[area legend, draw=black, fill=green, fill opacity=0.5, forget plot]
table[row sep=crcr] {%
x y\\
2 0\\
3 0\\
3 1\\
2 1\\
}--cycle;
\node[align=center]
at (axis cs:2.5,0.5) {c};
\legend{short text 1, short text 2, looooooooooooooooooooooooooooooooooooooooog text};
\end{axis}
\end{tikzpicture}
\caption{Caption}
\label{fig:my_label}
\end{figure}
\end{document}
答案1
我看了你的例子，在这种情况下，我亲自用matrix中的选项构建了自己的图例\usetikzlibrary。如上所述这里对于较长的条目，您可以使用nodes={text width=width("the longest legend entry")}来设置节点（在本例中为图例）的宽度。对于条目 1 和 2 之间的空间，我添加了\hspace{length}，您可以根据需要进行修改。
\documentclass[border=5pt]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=newest}
\usetikzlibrary{matrix} % <- added for self made legend
\begin{document}
\begin{tikzpicture}
\begin{axis}[%
name=plot,
width=.7\textwidth,
scale only axis,
clip = false,
legend columns=2,
legend style={ at={(axis cs:1.5,1.2)},
/tikz/column 2/.style={
column sep=5pt},
anchor=south},
]
\addplot[area legend, draw=black, fill=gray, fill opacity=0.5, forget plot]
table[row sep=crcr] {%
x y\\
1 0\\
2 0\\
2 1\\
1 1\\
}--cycle;
\node[align=center]
at (axis cs:1.5,0.5) {a};
\label{plot:a}
\addplot[area legend, draw=black, fill=red, fill opacity=0.5, forget plot]
table[row sep=crcr] {%
x y\\
0 0\\
1 0\\
1 1\\
0 1\\
}--cycle;
\node[align=center]
at (axis cs:0.5,0.5) {b};
\label{plot:b}
\addplot[area legend, draw=black, fill=green, fill opacity=0.5, forget plot]
table[row sep=crcr] {%
x y\\
2 0\\
3 0\\
3 1\\
2 1\\
}--cycle;
\node[align=center]
at (axis cs:2.5,0.5) {c};
\label{plot:c}
\coordinate (legend) at (axis cs:1.5,1.2);
\end{axis}
\matrix[
draw,
matrix of nodes,
anchor=south,
font=\footnotesize,
nodes={text width=width("looooooooooooooooooooooooooooooooooooooooog text")},
] at (legend) {
\ref{plot:a} short text 1 \hspace{1cm} \ref{plot:b} short text 2 \\
\ref{plot:c} looooooooooooooooooooooooooooooooooooooooog text \\
};
\end{tikzpicture}
\end{document}