Is possible to temporize overlays in beamer?

Question

Consider this minimal example:

\documentclass[aspectratio=169, 16pt]{beamer}
\usetheme[titleformat=smallcaps]{metropolis} % Usemetropolistheme

\usepackage[english]{babel}

\begin{document}
\begin{frame}[standout]
\only<+>{H}
\only<+>{He}
\only<+>{Hel}
\only<+>{Hell}
\only<+>{Hello}
\only<+>{Hello w}
\only<+>{Hello wo}
\only<+>{Hello wor}
\only<+>{Hello worl}
\only<+>{Hello world}
\only<+>{Hello world!}
\end{frame}
\end{document}

Basically, it's animated text using beamer's overlay. However, as far as I know, I have to manually go to the next slide to make it works. There is a way to temporize the process? I know that a solution could be to export the image, make a gif and use the animate package. However there are two downsides in this solution: gifs are not vectorial, I have to make a new gif each time I change something in the layout (like fonts or anything like that).

Note It's not mandatory to use beamer overlays. However, the solution must work with beamer class and xelatex compiler.

The animate way does not require the detour via GIF. Where did you get this information from? Pkg animate is perfectly suited for animating vectorial graphics within PDF. — AlexG, Mar 11 '24 at 12:53

samcarter_is_at_topanswers.xyz · Accepted Answer · 2024-03-11T11:24:19.160

5

You can specify the time each overlay should be shown with \transduration{<time in seconds>}:

\documentclass[aspectratio=169]{beamer}
\usetheme{moloch}% modern fork of the metropolis theme
\usepackage[english]{babel}
\begin{document}
\begin{frame}[standout]
\transduration{0.1}
\only<+>{H}
\only<+>{He}
\only<+>{Hel}
\only<+>{Hell}
\only<+>{Hello}
\only<+>{Hello w}
\only<+>{Hello wo}
\only<+>{Hello wor}
\only<+>{Hello worl}
\only<+>{Hello world}
\only<+>{Hello world!}
\end{frame}
\end{document}

Note: the automatic slide transitions only work with pdf viewers that support java script and they need to be in presentation mode.

edited Mar 11 '24 at 11:24

answered Dec 09 '18 at 21:44

samcarter_is_at_topanswers.xyz

158,329

It works. and the result is the same as using \animate<>. However, with both of them slides changes each second. There is a problem in my pdf viewer? – gvgramazio Dec 09 '18 at 21:50
@gvgramazio Which pdfviewer do you use? With the example above they should change ten times a second. (if the slides are complex and/or the computer is slow, rendering can take longer) – samcarter_is_at_topanswers.xyz Dec 09 '18 at 21:52
The default document viewer of Ubuntu 18.04: Evince 3.28.4 – gvgramazio Dec 09 '18 at 21:56
And it doesn't work at all with the integrated pdf viewer of Firefox. – gvgramazio Dec 09 '18 at 22:00
@gvgramazio Can you try with adobe reader? – samcarter_is_at_topanswers.xyz Dec 09 '18 at 22:00
It's not developed anymore for Linux. The last version dates back in 2013. – gvgramazio Dec 09 '18 at 22:02
@gvgramazio https://tex.stackexchange.com/questions/40332/how-can-i-set-a-time-between-slides-to-create-an-automatic-slideshow-with-beamer#comment971330_40335 suggests that it also works in evince – samcarter_is_at_topanswers.xyz Dec 09 '18 at 22:06
\transduration{3} works fine with evince. The problem is for small transitions. – gvgramazio Dec 09 '18 at 22:11
@gvgramazio The problem might then be the time necessary to render the slide, even a \transduration{0} will only be as fast as the rendering is done – samcarter_is_at_topanswers.xyz Dec 09 '18 at 22:13
If I move through slides with keys I scroll the whole presentation (roughly 50 slides) in 2 seconds or so. I don't think the problem is the rendering. Maybe the time resolution in evince is low. – gvgramazio Dec 09 '18 at 22:16
Anyway, your answer solve my question so it deserves to be accepted. I just need to solve another problem now. :) – gvgramazio Dec 09 '18 at 22:17
1

I confirm that the problem doesn't exist with okular. – gvgramazio Dec 09 '18 at 22:20
1

@gvgramazio If you are really desperate, produce an animated gif as in this answer or an mp4 as in this answer, and embed them. Needless to say that will reduce the quality, and whether there is a way to synchronize the resolution with the one of the projector I don't know. – Dec 09 '18 at 22:33
@gvgramazio What makes you think animate would need a gif sequence as input? – AlexG Dec 10 '18 at 08:22
@AlexG my bad, I mixed up things. – gvgramazio Dec 10 '18 at 09:45

AlexG · Answer 2 · 2024-03-11T13:01:50.417

Just to clear up the misunderstanding that an animate-based solution would require a pre-fabricated set of bitmapped (gif, png, whatever) animation frames. Of course, a JavaScript supporting PDF viewer is required for this kind of animations; on Linux there is at least Okular that provides this functionality, besides Acrobat Reader for the other platforms.

\documentclass[aspectratio=169,16pt]{beamer}
\usetheme[titleformat=smallcaps]{metropolis} % Use metropolis theme
\usepackage{animate}
\usepackage[english]{babel}
\begin{document}
\begin{frame}[standout]
\begin{animateinline}[autoplay,loop]{2}
    \makebox[\widthof{\strut Hello world!}][l]{\strut} \newframe

    \makebox[\widthof{\strut Hello world!}][l]{\strut H} \newframe

    \makebox[\widthof{\strut Hello world!}][l]{\strut He} \newframe

    \makebox[\widthof{\strut Hello world!}][l]{\strut Hel} \newframe

    \makebox[\widthof{\strut Hello world!}][l]{\strut Hell} \newframe

    \makebox[\widthof{\strut Hello world!}][l]{\strut Hello} \newframe

    \makebox[\widthof{\strut Hello world!}][l]{\strut Hello w} \newframe

    \makebox[\widthof{\strut Hello world!}][l]{\strut Hello wo} \newframe

    \makebox[\widthof{\strut Hello world!}][l]{\strut Hello wor} \newframe

    \makebox[\widthof{\strut Hello world!}][l]{\strut Hello worl} \newframe

    \makebox[\widthof{\strut Hello world!}][l]{\strut Hello world} \newframe

    \makebox[\widthof{\strut Hello world!}][l]{\strut Hello world!}
  \end{animateinline}
\end{frame}
\end{document}

Click on the image to see the animated version (vectorial [SVG]):

Is possible to temporize overlays in beamer?

2 Answers2