pgfplots：polaraxis | polar | 无法添加注释（\draw，\node）

Question

我想，我忽略了显而易见的东西！

• 我想用该pgfplots包创建一个（空的）极坐标图。
• 我想添加一些自定义注释等等使用tikz命令（例如\draw或）。\node
• 问题：看起来，我的自定义注释没有被呈现？！

---

\documentclass[border=10pt]{standalone} % Problem also occurs in "article" class.

\usepackage{pgfplots}
\pgfplotsset{compat=1.16} % Does not seem to be relevant to my issue.
\usepgfplotslibrary{polar}

% Nice sans-serif font, irrelevant to the question :)
\usepackage{arev}

\begin{document}

\begin{tikzpicture}
    \begin{polaraxis}
    [
        % Options
        width = 120mm,
        height = 120mm,
        scale only axis, % Does not seem to be relevant to my issue.    
        xmin = 0,
        xmax = 360,
        ymin = -1,
        ymax = 1,
        yticklabels = {},
        ylabel = {ylabel},
        xlabel = {xlabel},
    ]
    % \addplot etc.
    % No effect?!
    \node at (0,0) {Annotation};
    \end{polaraxis}
\end{tikzpicture}

\end{document}

Answer 1

在我看来，您pgfplots把允许负半径与混淆了ymin = -1。如果您只使用非负边界，ymin=0那么您会得到。

\documentclass[border=10pt]{standalone}

\usepackage{pgfplots}
\pgfplotsset{compat=1.16}
\usepgfplotslibrary{polar}

% Nice sans-serif font, irrelevant to the question :)
%\usepackage{arev}

\begin{document}

\begin{tikzpicture}
    \begin{polaraxis}
    [
        % Options
        width = 120mm,
        height = 120mm,
        scale only axis,    
        xmin = 0,
        xmax = 360,
        ymin = 0,
        ymax = 1,
        yticklabels = {},
        ylabel = {ylabel},
        xlabel = {xlabel},
    ]
    % \addplot etc.
    % No effect?!
    \node at (0,0) {Annotation};
    \end{polaraxis}
\end{tikzpicture}

\end{document}