Tikz Pgfplots - 使用 Stripes 從長條圖建立圖例

Question

我在嘗試為帶有條紋的條形圖創建圖例時遇到問題。

我想建立一個圖例，顯示每個條帶條紋的矩形，如圖所示。

建立上圖的程式碼是：

\documentclass[11pt,twoside,a4paper]{article}

\usepackage{pgfplots}
\pgfplotsset{compat=newest}
\usetikzlibrary{plotmarks}
\usetikzlibrary{arrows.meta}
\usepgfplotslibrary{patchplots}
\usepackage{grffile}
\usetikzlibrary{patterns}

\begin{document}

\begin{tikzpicture}
\scriptsize
\begin{axis}[/pgf/number format/1000 sep={},
width=1.9in,
height=1.5in,
at={(0.6in,0.83in)},
scale only axis,
bar shift auto,
clip=false,
separate axis lines,
every outer x axis line/.append style={black},
every x tick label/.append style={font=\color{black}},
every x tick/.append style={black},
xmin=0,
xmax=4,
xtick={1,2,3},
xticklabels={\empty},
every outer y axis line/.append style={red},
every y tick label/.append style={font=\color{red}},
every y tick/.append style={red},
ymin=0,
ymax=10,
ylabel={YYY},
axis background/.style={fill=white},
legend style={at={(0.03,0.97)}, anchor=north west, legend cell align=left,     align=left, draw=black}
]
\addplot[ybar, bar width=0.1, fill=white,
    postaction={
        pattern=north east lines}, draw=black] table[row sep=crcr] {%
1   2\\
2   3\\
3   4\\
};
\addlegendentry{One}

\addplot [color=black, forget plot]
  table[row sep=crcr]{
0   0\\
4   0\\
};

\addplot[ybar, bar width=0.1, fill=white,
    postaction={
        pattern=dots}, draw=black] table[row sep=crcr] {
1   2\\
2   3\\
3   4\\
};
\addlegendentry{Second}

\addplot[ybar, bar width=0.1, fill=white,
    postaction={
        pattern=horizontal lines}, draw=black] table[row sep=crcr] {
1   2\\
2   3\\
3   4\\
};
\addlegendentry{Third}

\end{axis}
\end{tikzpicture}

\end{document}

很抱歉，如果這個問題已再次發布，但我無法從我見過的所有相關主題中找出解決方案。預先非常感謝您。

Answer 1

您可以透過定義自己的圖例樣式來做到這一點。

請查看代碼以了解更多詳細資訊。 （請注意，我僅將您的程式碼減少到此處的必要部分。）

% used PGFPlots v1.14
\documentclass[border=5pt]{standalone}
\usepackage{pgfplots}
\usetikzlibrary{
    patterns,
}
    \pgfplotsset{
        compat=1.7,
        % define your own legend style here
        my ybar legend/.style={
            legend image code/.code={
                \draw [##1] (0cm,-0.6ex) rectangle +(2em,1.5ex);
            },
        },
    }
\begin{document}
\begin{tikzpicture}
        \scriptsize
    \begin{axis}[
        width=1.9in,
        height=1.5in,
        scale only axis,
        ymin=0,
        enlarge x limits={abs=0.5},
        bar shift auto,
        legend pos=north west,
        table/row sep=crcr,
        ybar,
        bar width=0.1,
        % apply your own legend style here (or at each `\addplot command)
        my ybar legend,
    ]
        \addplot [pattern=north east lines] table {
            1   2\\
            2   3\\
            3   4\\
        };
        \addplot [pattern=dots] table {
            1   2\\
            2   3\\
            3   4\\
        };
        \addplot [pattern=horizontal lines] table {
            1   2\\
            2   3\\
            3   4\\
        };
        \legend{
            First,
            Second,
            Third,
        }

    \end{axis}
\end{tikzpicture}
\end{document}