在 longtable 中垂直和水平居中文字和圖像

Question

我想將文字和圖像在長桌中垂直和水平居中。然而不幸的是我似乎無法讓它工作。範例如下：

\documentclass[11pt,a4paper,english]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{babel}
\usepackage{array,longtable,ragged2e}
\usepackage{graphicx}
 
\begin{document}
       
\begin{longtable}{| l | c | c |}
    \hline
     & Here is a Text & Here is a Text \\\hline
    Here is a Text & \includegraphics[height=2cm]{img/image.png} & \includegraphics[height=2cm]{img/image.png} \\\hline 
    Here is a Text & \raisebox{-\height}{\includegraphics[height=2cm]{img/image.png}} & \raisebox{-\height}{\includegraphics[height=2cm]{img/image.png}} \\\hline               
\caption{My Caption}
\label{tab:FirstTab}
\end{longtable}
\mbox{}\\    
  
\end{document}

我也嘗試了以下更改，但沒有幫助：

Here is a Text & \raisebox{-\height}{\includegraphics[height=2cm]{img/image.png}} & \raisebox{-\height}{\includegraphics[height=2cm]{img/image.png}} \\\hline   

Answer 1

一種方法是使用套件valign中的巨集adjusbox：

\documentclass[11pt,a4paper,english]{article}
\usepackage[T1]{fontenc}
\usepackage{ragged2e}
\usepackage{babel}
\usepackage{array,longtable,makecell}
\usepackage[demo,               % in real document delete 'demo'
            export]{adjustbox}  % it load graphicx too

\begin{document}

\begingroup
\setcellgapes{3pt}
\makegapedcells % add vertical space/above/below cell's content
\begin{longtable}{| l | c | c |}
    \hline
     & Here is a Text & Here is a Text \\\hline
    Here is a Text & \includegraphics[height=2cm,valign=c]{img/image.png} & \includegraphics[height=2cm,valign=c]{img/image.png} \\\hline
    Here is a Text & \includegraphics[height=2cm,valign=c]{img/image.png} & \includegraphics[height=2cm,valign=c]{img/image.png} \\\hline
\caption{My Caption}
\label{tab:FirstTab}
\end{longtable}
\endgroup

\end{document}

在使用時adjustbox，我們可以替換includegraphics為\adjustimageadd 確定單元格中圖像的位置，設定如下\adjustboxset：

\documentclass[11pt,a4paper,english]{article}
\usepackage[T1]{fontenc}
\usepackage{ragged2e}
\usepackage{babel}
\usepackage{array,longtable}
\usepackage[demo,               % in real document delete 'demo'
            export]{adjustbox}  % it load `graphicx` too

\begin{document}

\begingroup
\adjustboxset{height=20mm,valign=c, margin=0pt 3pt 0pt 3pt} % <---
\begin{longtable}{| l | c | c |}
    \hline
                & Here is a Text                & Here is a Text                \\
    \hline
Here is a Text  & \adjustimage{}{img/image} & \adjustimage{}{img/image} \\
    \hline
Here is a Text  & \adjustimage{}{img/image} & \adjustimage{}{img/image} \\
    \hline
\caption{My Caption}
\label{tab:FirstTab}
\end{longtable}
\endgroup

\end{document}

這給出了與第一個提出的解決方案相同的結果。筆記，在上面的MWE中省略了圖形檔案副檔名png。如果存在具有不同擴展名的相同圖像文件，並且您只想使用其中選定的一個，則它們是必需的。