如何消除旋转的四分之一极坐标图与其标题之间的间隙？

Question

我有一个简单的四分之一极坐标图，我想将其旋转 -90°。但是，这样做会在图和其标题之间插入一个很大的间隙。当我将图旋转 +90° 时不会发生这种情况。这是 pgfplots 中的错误吗？

以下是 MWE：

\documentclass[]{article}
\usepackage[font=small,labelfont=bf]{caption}
\usepackage{subcaption}
\usepackage{pgfplots}

\pgfplotsset{compat=1.13}
\usepgfplotslibrary{polar}

\begin{document}
\begin{figure}
\centering
\begin{subfigure}[t]{0.49\columnwidth}
    \centering
    \begin{tikzpicture}
        \begin{polaraxis}[xmin=0,xmax=90,ymin=0,ymax=1,rotate=90,x dir=reverse,domain=0:90,no markers, yticklabels={}]]
            \addplot [thick, smooth] {cos(x)};
        \end{polaraxis}
    \end{tikzpicture}%
    \caption{Positive $90^\circ$ rotation}
\end{subfigure}
\begin{subfigure}[t]{0.49\columnwidth}
    \centering
    \begin{tikzpicture}
        \begin{polaraxis}[xmin=0,xmax=90,ymin=0,ymax=1,rotate=-90,x dir=reverse,domain=0:90,no markers,yticklabels={}]]
            \addplot [thick, smooth] {cos(x)};
        \end{polaraxis}
    \end{tikzpicture}%
    \caption{Negative $90^\circ$ rotation (adds gap)}
\end{subfigure}
\caption{Rotation of a polar graph}
\end{figure}
\end{document}

Answer 1

以下是对齐两张图片的一些技巧

• clip=false将密钥添加到正确的polaraxis环境。
• 定义为 左图的右侧，其中 baseline是左轴的名称tikzpictureouter southbaseline=s.outer souths

---

\documentclass[]{article}
\usepackage[font=small,labelfont=bf]{caption}
\usepackage{subcaption}
\usepackage{pgfplots}

\pgfplotsset{compat=1.13}
\usepgfplotslibrary{polar}

\begin{document}
\begin{figure}
\centering
\begin{subfigure}[t]{0.49\columnwidth}
    \centering
    \begin{tikzpicture}
        \begin{polaraxis}[name=s,xmin=0,xmax=90,ymin=0,ymax=1,rotate=90,x dir=reverse,domain=0:90,no markers, yticklabels={}]]
            \addplot [thick, smooth] {cos(x)};
        \end{polaraxis}
    \end{tikzpicture}%
    \caption{Positive $90^\circ$ rotation}
\end{subfigure}
\begin{subfigure}[t]{0.49\columnwidth}
    \centering
    \begin{tikzpicture}[baseline=(s.outer south)]
        \begin{polaraxis}[clip=false,xmin=0,xmax=90,ymin=0,ymax=1,rotate=-90,x dir=reverse,domain=0:90,no markers,yticklabels={}]]
            \addplot [thick, smooth] {cos(x)};
        \end{polaraxis}
    \end{tikzpicture}%
    \caption{Negative $90^\circ$ rotation (adds gap)}
\end{subfigure}
\caption{Rotation of a polar graph}
\end{figure}
\end{document}

Answer 2

在这里，我将第二个设置tikzpicture为临时值\box0，然后使用\smash{\raisebox{-.45\ht0}{\copy0}}

编辑：但是，上述方法似乎破坏了居中。因此，\centering我没有在此子图中使用，而是使用了\hfil\smash{\raisebox{-.45\ht0}{\copy0}}\hfill。

\documentclass[]{article}
\usepackage[font=small,labelfont=bf]{caption}
\usepackage{subcaption}
\usepackage{pgfplots}

\pgfplotsset{compat=1.13}
\usepgfplotslibrary{polar}

\begin{document}
\begin{figure}
\centering
\begin{subfigure}[t]{0.49\columnwidth}
    \centering
    \begin{tikzpicture}
        \begin{polaraxis}[xmin=0,xmax=90,ymin=0,ymax=1,rotate=90,x dir=reverse,domain=0:90,no markers, yticklabels={}]]
            \addplot [thick, smooth] {cos(x)};
        \end{polaraxis}
    \end{tikzpicture}%
    \caption{Positive $90^\circ$ rotation}
\end{subfigure}
\begin{subfigure}[t]{0.49\columnwidth}
    \setbox0=\hbox{\begin{tikzpicture}
        \begin{polaraxis}[xmin=0,xmax=90,ymin=0,ymax=1,rotate=-90,x dir=reverse,domain=0:90,no markers,yticklabels={}]]
            \addplot [thick, smooth] {cos(x)};
        \end{polaraxis}
    \end{tikzpicture}}\hfil\smash{\raisebox{-.45\ht0}{\copy0}}\hfill%
    \caption{Negative $90^\circ$ rotation}
\end{subfigure}
\caption{Rotation of a polar graph}
\end{figure}
\end{document}