\documentclass[12pt,a4paper]{article}
\usepackage[latin1]{inputenc} % not needed in new latex versions
\usepackage[T1]{fontenc}
\usepackage{amsfonts,amsmath,amssymb,graphicx,amsthm,mathtools,systeme}
\usepackage[tikz]{bclogo}
\usepackage{tikz,tkz-tab,moreverb} % tableau de signe moreverb not needed
\usetikzlibrary{arrows}
\usepackage[french]{babel}
\usepackage{pifont} %bouni
\usepackage{fancybox} %pour faire l'encadrement
\usepackage[usestackEOL]{stackengine}
\usepackage{verbatim}
\usepackage{color}
\usepackage[final]{pdfpages} %pour inserer une page pdf
\usepackage{awesomebox}
%---- Dimensions des marges ---
\usepackage{geometry}
\geometry{left=1.5cm,right=1.5cm,top=2.0cm,bottom=2.5cm}
%\usepackage{setspace}
%\onehalfspacing
%---- pages numbers with tikz---
\usepackage{fancyhdr}
\usepackage{lastpage}
\usetikzlibrary{shapes}
\fancypagestyle{mypagestyle}{%
\renewcommand{\headrulewidth}{0pt}
\fancyhf{}
\fancyfoot[C]{\tikz{ \node [rectangle, draw = black] (rectangle) at (0,0) {\thepage/\pageref{LastPage}} }}
}
\pagestyle{mypagestyle}
%----New Structure Exercice -----
\newtheoremstyle{sboxexc}% name of the style to be used
{\topsep}% measure of space to leave above the theorem. E.g.: 3pt
{\topsep}% measure of space to leave below the theorem. E.g.: 3pt
{\itshape}% name of font to use in the body of the theorem
{0pt}% of space to indent
{\bfseries}% name of head font
{}% punctuation between head and body
{ }% space after theorem head; " " = normal interword space
{\thmname{#1}}% Manually specify head
\newcounter{counter}
\setcounter{counter}{1}
\theoremstyle{sboxexc}
\newcommand{\optionaltext}{}
\newtheorem*{Exc}{\shadowbox{\ding{228} Exercice \arabic{counter}\optionaltext}}
\newcommand{\exo}[2][]{\renewcommand{\optionaltext}{#2}\begin{Exc}\normalfont\mbox{}\par}
\newcommand{\finexo}{\renewcommand{\optionaltext}{}\end{Exc}\addtocounter{counter}{1}}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\newcommand{\isEquivTo}[1]{\underset{#1}{\sim}}
\newcommand*{\transp}[2][-3mu]{\ensuremath{\mskip1mu\prescript{\smash{\mathrm t\mkern#1}}{}{\mathstrut#2}}}%
\DeclareMathOperator{\im}{Im}
\DeclareMathOperator{\rg}{rg}
\DeclareMathOperator{\vect}{Vect}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\definecolor{sfaxlogo}{RGB}{127,176,206}
\colorlet{sfaxblue}{sfaxlogo!70!black!60!blue}
\pagestyle{empty}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{document}
%------------%%%%%%%%%%%%%%%%%%%%%%%%%%%begin entete pour mes TD%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%------
%----------------------------------------------
\mbox{}\begin{figure*}[t]
\bfseries
\leavevmode\rlap{
\Longstack{
Republic of xxxxx\\
Ministry of Higher Education\\
and scientific Research\\
\textbf{-- -- -- $\star\star\star$ -- -- --}\\
University of xxxx \\
Faculty of Sciences of xxxx
}}\hfill%
\includegraphics[width=3.0cm,height=3.0cm]{example-image-9x16}\hfill%
\llap{
\Longstack{
Department of Xxxxxxxxxxx\\
$\dotfill\dotfill\dotfill \star\star\star \dotfill\dotfill\dotfill$\\
Laboratory: Physics-Xxxxxxxxxxx\\
and Xxxxxxxxxxxx (LR/xx/XX--xx)\\
$\dotfill\dotfill\dotfill \star\star\star \dotfill\dotfill\dotfill$
\\
Academic Year: 2022 / 2023
}}
\stackunder[1pt]{\rule{\linewidth}{1.2pt}}
{\rule{\linewidth}{1.2pt}}
\end{figure*}
%----------------------------------------------
%\vspace*{1.1cm}
%--
\vspace{0.5cm}
\begin{center}
\textbf{{\LARGE \textcolor{sfaxblue}{Thesis in xxxxxx}}}
\end{center}
\end{document}
我想让这张图片居中
答案1
只需省略\rlap和\llap包装器。当然，这只有在两个\Longstack对象之间有足够的空间时才有效——幸运的是，手头的文档就是这种情况。
\documentclass[12pt,a4paper]{article}
\usepackage[latin1]{inputenc} % not needed in new latex versions
\usepackage[T1]{fontenc}
\usepackage{amsfonts,amsmath,amssymb,graphicx,amsthm,mathtools,systeme}
\usepackage[tikz]{bclogo}
\usepackage{tikz,tkz-tab,moreverb} % tableau de signe moreverb not needed
\usetikzlibrary{arrows}
\usepackage[french]{babel}
\usepackage{pifont} %bouni
\usepackage{fancybox} %pour faire l'encadrement
\usepackage[usestackEOL]{stackengine}
\usepackage{verbatim}
\usepackage{color}
\usepackage[final]{pdfpages} %pour inserer une page pdf
\usepackage{awesomebox}
%---- Dimensions des marges ---
\usepackage{geometry}
\geometry{left=1.5cm,right=1.5cm,top=2.0cm,bottom=2.5cm}
%\usepackage{setspace}
%\onehalfspacing
%---- pages numbers with tikz---
\usepackage{fancyhdr}
\usepackage{lastpage}
\usetikzlibrary{shapes}
\fancypagestyle{mypagestyle}{%
\renewcommand{\headrulewidth}{0pt}
\fancyhf{}
\fancyfoot[C]{\tikz{ \node [rectangle, draw = black] (rectangle) at (0,0) {\thepage/\pageref{LastPage}} }}
}
\pagestyle{mypagestyle}
%----New Structure Exercice -----
\newtheoremstyle{sboxexc}% name of the style to be used
{\topsep}% measure of space to leave above the theorem. E.g.: 3pt
{\topsep}% measure of space to leave below the theorem. E.g.: 3pt
{\itshape}% name of font to use in the body of the theorem
{0pt}% of space to indent
{\bfseries}% name of head font
{}% punctuation between head and body
{ }% space after theorem head; " " = normal interword space
{\thmname{#1}}% Manually specify head
\newcounter{counter}
\setcounter{counter}{1}
\theoremstyle{sboxexc}
\newcommand{\optionaltext}{}
\newtheorem*{Exc}{\shadowbox{\ding{228} Exercice \arabic{counter}\optionaltext}}
\newcommand{\exo}[2][]{\renewcommand{\optionaltext}{#2}\begin{Exc}\normalfont\mbox{}\par}
\newcommand{\finexo}{\renewcommand{\optionaltext}{}\end{Exc}\addtocounter{counter}{1}}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\newcommand{\isEquivTo}[1]{\underset{#1}{\sim}}
\newcommand*{\transp}[2][-3mu]{\ensuremath{\mskip1mu\prescript{\smash{\mathrm t\mkern#1}}{}{\mathstrut#2}}}%
\DeclareMathOperator{\im}{Im}
\DeclareMathOperator{\rg}{rg}
\DeclareMathOperator{\vect}{Vect}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\definecolor{sfaxlogo}{RGB}{127,176,206}
\colorlet{sfaxblue}{sfaxlogo!70!black!60!blue}
\pagestyle{empty}
\begin{document}
\mbox{}\begin{figure*}[t]
\bfseries
\leavevmode%
\Longstack{%
Republic of xxxxx\\
Ministry of Higher Education\\
and scientific Research\\
\textbf{-- -- -- $\star\star\star$ -- -- --}\\
University of xxxx \\
Faculty of Sciences of xxxx
}\hfill%
\includegraphics[width=3.0cm,height=3.0cm]{example-image-9x16}\hfill%
\Longstack{%
Department of Xxxxxxxxxxx\\
$\dotfill\dotfill\dotfill \star\star\star \dotfill\dotfill\dotfill$\\
Laboratory: Physics-Xxxxxxxxxxx\\
and Xxxxxxxxxxxx (LR/xx/XX--xx)\\
$\dotfill\dotfill\dotfill \star\star\star \dotfill\dotfill\dotfill$
\\
Academic Year: 2022/2023
}
\stackunder[1pt]{\rule{\linewidth}{1.2pt}}
{\rule{\linewidth}{1.2pt}}
\end{figure*}
%----------------------------------------------
%\vspace*{1.1cm}
%--
\vspace{0.5cm}
\begin{center}
\textbf{{\LARGE \textcolor{sfaxblue}{Thesis in xxxxxx}}}
\end{center}
\end{document}