Pgfplots 仅带有循环列表的图例条目

Question

我想仅生成带有 pgfplots 中模式的循环列表的图例。这是我拥有的代码。

\documentclass{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=newest}
\def\mystrut{\vphantom{hg}}

\pgfplotscreateplotcyclelist{cyc}{
    {black,solid, very thick},
    {blue,dashed, very thick},
    {red,dashdotted, very thick},
    {black,dotted, very thick},
    {brown,dash pattern=on 5pt off 2pt, very thick},
    {teal,dashdotdotted, very thick},
    {orange,densely dashed, very thick},
    {violet,densely dotted, very thick}, 
    {cyan,densely dashdotted, very thick},
    {green!70!black,loosely dashdotdotted, very thick},
    {magenta,dash pattern=on 3pt off 2pt on \the\pgflinewidth off 2pt, very thick}
    {gray}
}

\begin{document}
\begin{tikzpicture} 
    \begin{axis}[%
    legend columns=3,
    hide axis,
    xmin=10,
    xmax=50,
    ymin=0,
    ymax=0.4,
    legend style={font=\mystrut,draw=white!15!black,legend cell align=left},
    cycle list name = cyc,
    legend image post style={sharp plot}
    ]
    \addlegendimage{}
    \addlegendentry{A};
    \addlegendimage{}
    \addlegendentry{B};
    \addlegendimage{}
    \addlegendentry{C};
    \addlegendimage{}
    \addlegendentry{D};
    \addlegendimage{}
    \addlegendentry{E};
    \addlegendimage{}
    \addlegendentry{F};
    \end{axis}
\end{tikzpicture}
\end{document}

结果：

结果中没有循环模式。如何获取自动模式？

Answer 1

\addlegendimage需要您手动指定样式，它不会从循环列表中读取，它所做的只是向图例添加一些内容。您可以通过将轴做得非常小（因此图例框变得比轴大）来解决此问题，然后添加六个虚拟图。也许不太优雅，但它确实有效：

\documentclass{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=newest}
\def\mystrut{\vphantom{hg}}

\pgfplotscreateplotcyclelist{cyc}{
    {black,solid, very thick},
    {blue,dashed, very thick},
    {red,dashdotted, very thick},
    {black,dotted, very thick},
    {brown,dash pattern=on 5pt off 2pt, very thick},
    {teal,dashdotdotted, very thick},
    {orange,densely dashed, very thick},
    {violet,densely dotted, very thick}, 
    {cyan,densely dashdotted, very thick},
    {green!70!black,loosely dashdotdotted, very thick},
    {magenta,dash pattern=on 3pt off 2pt on \the\pgflinewidth off 2pt, very thick}
    {gray}
}

\begin{document}
\begin{tikzpicture} 
    \begin{axis}[%
    legend columns=3,
    scale only axis,width=1mm, % make axis really small (smaller than legend)
    hide axis,
    legend style={font=\mystrut,draw=white!15!black,legend cell align=left},
    cycle list name = cyc,
    legend image post style={sharp plot}
    ]

\pgfplotsinvokeforeach{1,...,6}{\addplot coordinates {(0,0)};} % make six dummy plots

    \addlegendentry{A};
    \addlegendentry{B};
    \addlegendentry{C};
    \addlegendentry{D};
    \addlegendentry{E};
    \addlegendentry{F};
    \end{axis}
\end{tikzpicture}
\end{document}