pgfplots ybar 虚线轮廓

Question

当用创建条形图时ybar，最后添加的图表有一个dashed轮廓，我似乎不明白为什么。

\documentclass{standalone}
\usepackage{pgfplots}

\begin{document}
    \begin{tikzpicture}
        \begin{axis}[
            axis lines=left,
            xmajorgrids,
            ymajorgrids,
            xmin=0,
            xmax=7,
            ymin=60,
            ymax=80,
            bar width=5mm
            ]
            \addplot+[ybar,mark=0,fill=black!80,draw=black]
                coordinates {
                (1,77.071)
            };
            \addplot+[ybar,mark=0,fill=black!30,draw=black]
                coordinates {
                (2,70.256)
            };
            \addplot+[ybar,mark=0,fill=black!30,draw=black]
                coordinates {
                (3,65.383)
            };
            \addplot+[ybar,mark=0,fill=black!30,draw=black]
                coordinates {
                (4,66.077)
            };
            \addplot+[ybar,mark=0,fill=black!30,draw=black]
                coordinates {
                (5,75.808)
            };
            \addplot+[ybar,mark=0,fill=black!10,draw=black]
                coordinates {
                (6,77.635)
            };
        \end{axis}
    \end{tikzpicture}
\end{document}

输出：

但是，当我“添加”较少的图时，这个问题就消失了，如下所示：

\documentclass{standalone}
\usepackage{pgfplots}

\begin{document}
    \begin{tikzpicture}
        \begin{axis}[
            axis lines=left,
            xmajorgrids,
            ymajorgrids,
            xmin=0,
            xmax=7,
            ymin=60,
            ymax=80,
            bar width=5mm
            ]
            \addplot+[ybar,mark=0,fill=black!80,draw=black]
                coordinates {
                (1,77.071)
            };
            \addplot+[ybar,mark=0,fill=black!30,draw=black]
                coordinates {
                (2,70.256)(3,65.383)(4,66.077)(5,75.808)
            };
            \addplot+[ybar,mark=0,fill=black!10,draw=black]
                coordinates {
                (6,77.635)
            };
        \end{axis}
    \end{tikzpicture}
\end{document}

输出：

Answer 1

此行为由 控制cycle list。如果你查看 pgfplots 手册第 214 页，你会发现

这解释了为什么第 6 个图有虚线。解决此问题的一种方法是添加solid到图中，或者您可以创建并使用自己的循环列表。

\documentclass{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.16}
\pgfplotscreateplotcyclelist{Syphirint}{
   fill=black!80,draw=black,solid,mark=none\\
   fill=black!30,draw=black,solid,mark=none\\
   fill=black!30,draw=black,solid,mark=none\\
   fill=black!30,draw=black,solid,mark=none\\
   fill=black!30,draw=black,solid,mark=none\\
   fill=black!10,draw=black,solid,mark=none\\
}

\begin{document}
    \begin{tikzpicture}
        \begin{axis}[cycle list name=Syphirint,
            axis lines=left,
            xmajorgrids,
            ymajorgrids,
            xmin=0,
            xmax=7,
            ymin=60,
            ymax=80,
            bar width=5mm
            ]
            \addplot+[ybar]
                coordinates {
                (1,77.071)
            };
            \addplot+[ybar]
                coordinates {
                (2,70.256)
            };
            \addplot+[ybar]
                coordinates {
                (3,65.383)
            };
            \addplot+[ybar]
                coordinates {
                (4,66.077)
            };
            \addplot+[ybar]
                coordinates {
                (5,75.808)
            };
            \addplot+[ybar]
                coordinates {
                (6,77.635)
            };
        \end{axis}
    \end{tikzpicture}
\end{document}