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多个人物的全局图例

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多个人物的全局图例

如同这个问题，我需要输出如下但要简洁。我的解决方案代码不再简洁：我添加了一个虚拟代码axis来使用其图例。此外，图例必须位于页面顶部。

在此处输入图片描述

这是它的代码：

\documentclass{article}
\usepackage{pgfplots}
\newcommand{\realplot}[1]{
\begin{tikzpicture}
    \begin{axis}
        \addlegendimage{empty legend}\addlegendentry{Matrix #1}
        \addplot {0};
        \addplot {1};
        \addplot {2};
        \addplot {3};
    \end{axis}
\end{tikzpicture}}
\begin{document}
\begin{figure}[ht]
\realplot{1}\realplot{2}\realplot{3}
\realplot{4}\realplot{5}\realplot{6}
\begin{tikzpicture} % here starts the dummy tikzpicture
    \begin{axis}[
        legend columns=4, 
        legend style={%
            at={(-100,-100)},%
            anchor=north east,%
            at={(axis description cs:1,10),%
        },%
        /tikz/column 2/.style={column sep=5pt,},},]
        \addplot {0};
        \addlegendentry{Method A}
        \addplot {0};
        \addlegendentry{Method B}
        \addplot {0};
        \addlegendentry{Method C}
        \addplot {0};
        \addlegendentry{Method D}
    \end{axis}
\end{tikzpicture}
\end{figure}
\end{document}

答案1

由于所有轴都包含相同的绘图类型，因此我添加了自定义图例，该图例取自另一个回答。

\documentclass{article}
\usepackage{pgfplots}
\usepackage{pgfkeys}
\newcommand{\realplot}[1]{
\begin{tikzpicture}
    \begin{axis}
        \addlegendimage{empty legend}\addlegendentry{Matrix #1}
        \addplot {0};
        \addplot {1};
        \addplot {2};
        \addplot {3};
    \end{axis}
\end{tikzpicture}}
    % argument #1: any options
    \newenvironment{customlegend}[1][]{%
        \begingroup
        % inits/clears the lists (which might be populated from previous
        % axes):
        \csname pgfplots@init@cleared@structures\endcsname
        \pgfplotsset{#1}%
    }{%
        % draws the legend:
        \csname pgfplots@createlegend\endcsname
        \endgroup
    }%

    % makes \addlegendimage available (typically only available within an
    % axis environment):
    \def\addlegendimage{\csname pgfplots@addlegendimage\endcsname}
\pgfplotsset{
cycle list={%
{draw=black,mark=star,solid},
{draw=black, mark=square,solid},%densely dashed}, 
{draw=black,mark=+,solid},%dashdotted}, %every mark/.append style={rotate=90},
{black,mark=o},}}
\begin{document}
\begin{figure}[ht]
\hspace{10ex}
   \begin{tikzpicture}
        \begin{customlegend}[legend columns=4,legend style={align=left,draw=none,column sep=2ex},legend entries={Method A ,Method B ,Method C,Method D}]
        \addlegendimage{mark=star,solid,line legend}
        \addlegendimage{mark=square,solid}   
        \addlegendimage{mark=+,solid}
        \addlegendimage{mark=o}
        \end{customlegend}
     \end{tikzpicture}

\realplot{1}\realplot{2}\realplot{3}
\realplot{4}\realplot{5}\realplot{6}
\end{figure}
\end{document}

输出：

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