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pgfplots 中堆叠条形图的图例上出现意外边框

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pgfplots 中堆叠条形图的图例上出现意外边框

我想使用 pgfplots 中的堆叠条形图来直观显示泰坦尼克号上头等舱、二等舱和三等舱的女性和男性乘客数量。

这里的代码：

\documentclass[crop,tikz]{standalone}
\usepackage{pgfplots}
\pgfplotsset{width=10cm,compat=1.9}
\usetikzlibrary{patterns}

\definecolor{acolor}{HTML}{D55E00}
\definecolor{bcolor}{HTML}{0072B2}
\begin{document}

\begin{tikzpicture}
\begin{axis}[ybar stacked,
    bar width=2cm,
    axis lines=left,
    axis line style={opacity=0},
    ytick=\empty,
    major x tick style = transparent,
    ymin=0, ymax=750,
    enlarge x limits=0.2,
    nodes near coords,
    symbolic x coords={1st class, 2nd class, 3rd class},
    xtick=data,
    legend style={draw=none, at={(0.5,-0.1)},
        anchor=north,legend columns=-1},]
    \addplot+[ybar, fill=acolor, draw=none, text=white] plot coordinates {(1st class, 179)(2nd class, 172)(3rd class, 499)};
    \addplot+[ybar, fill=bcolor, draw=none, text=white] plot coordinates {(1st class, 143)(2nd class, 107)(3rd class, 212)};
    \legend{male passengers,female passengers}
\end{axis}
\end{tikzpicture}


\end{document}

在此处输入图片描述

但是，图例的边框显示不正确。我期望图例区域没有任何边框。如何解决这个问题？

答案1

你应该添加

\pgfplotsset{compat=1.18}

（或者您拥有的版本；否则，您正在运行启用的原始“错误”......）

然后添加选项

legend image post style={fill, draw=white},

在 之后legend style。我认为这draw=none应该有效，但它似乎被忽略了。（我在手册中的“所有支持的样式”中发现了它）。

答案2

用于legend image code创建所需的图例图像。（此处为略低于基线的矩形）

图例方块没有边框（使用draw=none）

C

\documentclass[12pt,a4paper]{article}


\usepackage{crop,tikz}
\usepackage{pgfplots}
\pgfplotsset{width=10cm,compat=1.18}
\usetikzlibrary{patterns}

\definecolor{acolor}{HTML}{D55E00}
\definecolor{bcolor}{HTML}{0072B2}
\begin{document}
    
    \begin{tikzpicture}
        \begin{axis}[ybar stacked,
            bar width=2cm,
            axis lines=left,
            axis line style={opacity=0},
            ytick=\empty,
            major x tick style = transparent,
            ymin=0, ymax=750,
            enlarge x limits=0.2,
            nodes near coords,
            symbolic x coords={1st class, 2nd class, 3rd class},
            xtick=data,
        legend image code/.code={%
            \draw[#1, draw=none] (0cm,-0.2cm) rectangle (0.4cm,0.2cm);
        },  
        legend style={
            % no rectangle around
            draw=none, % 
            % position of the legend
            at={(0.05,-0.2)},
            anchor= west,
            legend columns=-1,
            /tikz/column 2/.style={column sep=15pt},
        },
            ]       
            \addplot+[ybar, fill=acolor, draw=none, text=white] plot coordinates {(1st class, 179)(2nd class, 172)(3rd class, 499)};
            \addplot+[ybar, fill=bcolor, draw=none, text=white] plot coordinates {(1st class, 143)(2nd class, 107)(3rd class, 212)};
            \legend{male passengers,female passengers}          
        \end{axis}
    \end{tikzpicture}
\end{document}

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