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如何将 groupplot 行中的单个图居中对齐

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如何将 groupplot 行中的单个图居中对齐

我有奇数个图，5 个，我想使用 groupplot 以及组 x 轴标签将第五个图居中对齐。我有一个 3x2 设置。我搜索了答案，我看到有人使用 stackengine 和单独的轴环境，但是我想保留 groupplot 标题，我发现编码更有条理，尤其是在图数量很多的情况下。如果您有任何建议，请提供意见，否则请帮助我将最后一个图居中。

图像

\documentclass[tikz,border=1.2pt]{standalone}   
\usepackage[utf8]{inputenc}
\usepackage{pgfplots,tikz}
\usepackage{fixltx2e}
\usepackage{siunitx}
\usepackage{xcolor}
\usepackage[version=4]{mhchem}
\usepgfplotslibrary{groupplots}
\usetikzlibrary{matrix}
\DeclareSIUnit{\molar}{M}
\pgfplotsset{compat=newest}

\pagestyle{empty}
\begin{document}

\begin{tikzpicture}[scale=0.75]
\begin{groupplot}[
group style={
rows=3,
columns=2,
horizontal sep=50pt,
vertical sep=50pt
},
    xlabel={},
    ylabel={},
    xtick pos=left,
    ytick pos=left,
scaled x ticks=real:1e-6,
xtick scale label code/.code={},
]
\nextgroupplot[title=\textbf{(a)}]
\addplot [only marks, mark=o]  {x^2};\label{raw}
\addplot [smooth] {x^3}; \label{fit}
\coordinate (top) at (rel axis cs:0,1); 

\nextgroupplot[title=\textbf{(b)}]
\addplot [only marks, mark=o] {x^2}; 

\nextgroupplot[title=\textbf{(c)}]
\addplot [only marks, mark=o] {x^2}; 

\nextgroupplot[title=\textbf{(d)}]
\addplot [only marks, mark=o] {x^2}; 
\nextgroupplot[title=\textbf{(c)}]
\addplot [only marks, mark=o] {x^2};
\coordinate (bot) at (rel axis cs:1,0);  

\end{groupplot}
\node at ($(group c1r1.west)!0.5!(group c1r2.west)$)[xshift=-1.2cm]{\rotatebox{90}{\Large{$\Delta$y}}};
\node at ($(group c1r3.south)!0.5!(group c1r3.south)$)[yshift=-1cm]{\Large{$x$}}};

\path (top|-current bounding box.north)--
  coordinate(legendpos)
  (bot|-current bounding box.north);
\matrix[
matrix of nodes,
anchor=south,
draw,
inner sep=0.2em,
draw
]at([yshift=1ex]legendpos)
{
\ref{raw}& data points &[5pt]
\ref{fit}& fitted curve\\};
\end{tikzpicture}


\end{document}

答案1

在此处输入图片描述

在 中groupplot，每个图都命名为group c<number>r<number>，其中最后一部分分别表示图的列号和行号。使用此功能，您可以使用库calc来放置最后一个图，例如使用

\nextgroupplot[title=\textbf{(c)},
  at = { ($ ( $ (group c1r2.south west) + (0,-100pt)$ )!0.5!(group c2r2.south east) $ ) }]

代码（我删除了最后的\node文本中的虚假右括号并将其更改\Large{...}为{\Large...}）：

\documentclass[tikz,border=1.2pt]{standalone}   
\usepackage[utf8]{inputenc}
\usepackage{pgfplots,tikz}
\usepackage{fixltx2e}
\usepackage{siunitx}
\usepackage{xcolor}
\usepackage[version=4]{mhchem}
\usepgfplotslibrary{groupplots}
\usetikzlibrary{matrix,calc}
\DeclareSIUnit{\molar}{M}
\pgfplotsset{compat=newest}

\pagestyle{empty}
\begin{document}

\begin{tikzpicture}[scale=0.75]
\begin{groupplot}[
group style={
rows=3,
columns=2,
horizontal sep=50pt,
vertical sep=50pt
},
    xlabel={},
    ylabel={},
    xtick pos=left,
    ytick pos=left,
scaled x ticks=real:1e-6,
xtick scale label code/.code={},
]
\nextgroupplot[title=\textbf{(a)}]
\addplot [only marks, mark=o]  {x^2};

\nextgroupplot[title=\textbf{(b)}]
\addplot [only marks, mark=o] {x^2}; 

\nextgroupplot[title=\textbf{(c)}]
\addplot [only marks, mark=o] {x^2}; 

\nextgroupplot[title=\textbf{(d)}]
\addplot [only marks, mark=o] {x^2}; 
\nextgroupplot[title=\textbf{(e)},
  at = { ($ ( $ (group c1r2.south west) + (0,-100pt)$ )!0.5!(group c2r2.south east) $ ) }]
\addplot [only marks, mark=o] {x^2};  

\end{groupplot}
\node[xshift=-1.2cm] at 
  ($(group c1r1.west)!0.5!(group c1r2.west)$)
  {\rotatebox{90}{{\Large $\Delta$y}}};
\node[yshift=-1cm] 
  at (group c1r3.south)
  {{\Large$x$}};
\end{tikzpicture}

\end{document}

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