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I have a problem with this slide: the layout of all the lines changes during the animation Thank you for helping me

\begin{frame}
\frametitle{Introduction}

\vspace{-1.25cm}
\begin{center}
Deux types de régime que l’on rencontre dans les installations électriques. Ils sont produits par des générateurs qui ont leur propre mode de fonctionnement.
\end{center}
\begin{itemize}
\item<2-> Courant continu CC ("DC")
\begin{itemize}
\item<3-> Générateur électrochimique : pile, batterie
\item<4-> Générateur électronique : panneau solaire
\item<5-> Redressement du courant alternatif
\end{itemize}

\vspace{-2.25cm}\hspace{8cm}
\includegraphics<2->[width=2.75cm,keepaspectratio]{Figures/courantCC.png}
\item<6-> Courant alternatif CA ("AC")
\begin{itemize}
\item<7-> Alternateur : convertion de l'énergie \\ \,\,\,\,\,\,mécanique en énergie électrique
\end{itemize}

\vspace{-2.25cm}\hspace{8cm}
\includegraphics<6->[width=2.75cm,keepaspectratio]{Figures/courantAC.png}
\end{itemize}
  %\begin{block}{Comments, suggestions or bug reports ?}
   % Please send a mail at: \email{melmorabity@fedoraproject.org}
  %\end{block}
\end{frame}

enter image description here enter image description here

samcarter_is_at_topanswers.xyz
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    Related/duplicate: Avoiding jumping frames in beamer – Alan Munn Aug 06 '18 at 19:57
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    Your MWE's become better but you're not quite there. Please add the preamble, i.e. \documentclass and that stuff including the definitions of \cro and \ahmed or the package where they are defined and add \end{document} in such a way that everybody can just copy the code and compile it. (BTW, does it help if you just add [t] after \begin{frame}?) –  Aug 06 '18 at 19:57
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    No, it is not. Did you try to compile it as listed in your question? It won't compile. It MUST start with \documentclass{...}. – AlexG Aug 06 '18 at 20:23

1 Answers1

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As explained by samcarter in this answer, the jumping can simply avoided by adding [t] after \begin{frame}. And your code is a bit rusty, there is no reason to start itemize so often, especially if you use columns, which I suggest. You can use [t] here as well in order to avoid jumps. As pointed out by @AlexG, your MWE is not complete. This is an MWE. It starts with \documentclass, ends with \end{document}, and can be compiled. Please consider to post documents in the future. (EDIT: samcarter pointed out that there were some \,\,\,, which I removed, and I also used the opportunity to redraw your pics with TikZ, which IMHO looks a bit better.)

\documentclass{beamer}
\usepackage{tikz}
\begin{document}
\begin{frame}[t]
\frametitle{Introduction}
\begin{center}
Deux types de régime que l’on rencontre dans les installations électriques. Ils sont produits par des générateurs qui ont leur propre mode de fonctionnement.
\end{center}
\begin{columns}
\begin{column}{8cm}
\begin{itemize}
\item<2-> Courant continu CC ("DC")
\item<3-> Générateur électrochimique : pile, batterie
\item<4-> Générateur électronique : panneau solaire
\item<5-> Redressement du courant alternatif
\item<6-> Courant alternatif CA ("AC")
\item<7-> Alternateur : convertion de l'énergie 
\begin{center}
mécanique en énergie électrique
\end{center}
\end{itemize}
\end{column}
\begin{column}[t]{4cm}
\only<2->{\begin{tikzpicture}[very thick,scale=0.35]
\draw[orange] (0,1.6) -- (7,1.6);
\draw (0,-2.5) -- (0,2.5) (0,0)node[left]{$0$} -- (7,0) node[above]{temps};
\node[text=blue!30,anchor=west,font=\small] at (-1.5,-4) {Courant continu (DC)};
\end{tikzpicture}\\}
\only<6->{\begin{tikzpicture}[very thick,scale=0.35]
\draw[orange] plot[variable=\x,domain=0:2*pi] ({1.05*\x},{2.5*sin(\x r)});
\draw (0,-2.5) -- (0,2.5) (0,0)node[left]{$0$} -- (7,0) node[above]{temps};
\node[text=blue!30,anchor=west,font=\small] at (-1.5,-4) {Courant alternatif (AC)};
\end{tikzpicture}}
\end{column}
\end{columns}
  %\begin{block}{Comments, suggestions or bug reports ?}
   % Please send a mail at: \email{melmorabity@fedoraproject.org}
  %\end{block}
\end{frame}
\end{document}

enter image description here