Overlay in beamer?

Overlay in beamer?

[Giuseppe Lipari]

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Dear list,

I am having some trouble in using the beamer export.
First of all, I have problems in finding documentation on the exporter
on-line. Is there an up-to-date manual of this exporter, and the list of
options? By searching for a solution to my problem, I found many different
notation around the web (the wiki, stackoverflow, etc.) but I could not
find a solution to my very simple problem.

I have three images to show in my slide, one after the other (or one on top
of the other).
In Latex beamer, I can write something like:

--------- begin-snippet-------------

\begin{figure}
  \begin{center}
    \includegraphics<1>[width=.7\textwidth]{figure1}
    \includegraphics<2>[width=.7\textwidth]{figure2}
    \includegraphics<3->[width=.7\textwidth]{figure3}
   \end{center}
\end{figure}

--------- end-snippet-------------

and it works. How do I do the same in org-beamer?


I tried several options, for example this one:

--------- begin-snippet-------------

  #+ATTR_BEAMER: :overlay <1>
  [[ file:figure1 ]]

  #+ATTR_BEAMER: :overlay <2>
  [[ file:figure2 ]]

  #+ATTR_BEAMER: :overlay <3>
  [[ file:figure3 ]]

--------- end-snippet-------------

or

--------- begin-snippet-------------

***                                 :B_ignoreheading:
    :PROPERTIES:
    :BEAMER_env: ignoreheading
    :BEAMER_act: <+>
    :END:

    [[file:figure1]]

    [[file:figure2]]

    [[file:figure3]]

--------- end-snippet-------------

and several other combinations of blocks, properties and attributes, but
the generated latex output is always more or less the same:

--------- begin-snippet-------------

\includegraphics[width=.9\linewidth]{figure1}
\includegraphics[width=.9\linewidth]{figure2}
\includegraphics[width=.9\linewidth]{figure3}

--------- end-snippet-------------

Can someone help me to understand how to put overlays on figures?

I am using org-mode version 8.2.5h (pulled from the git repository about
one month ago I guess) on Emacs 24.3.1

Thanks in advance,

Giuseppe Lipari


-- 
Giuseppe Lipari
RETIS Lab, CEIIC
Scuola Superiore Sant'Anna
via Moruzzi, 1
56127 Pisa
tel:   050 882030
fax:  050 882003
web: http://feanor.sssup.it/~lipari/
blogs: http://scacciamennule.blogspot.com
          http://okpanico,wordpress.com
          http://algoland.wordpress.com

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Re: Overlay in beamer?

[Eric S Fraga]

[...]

> I tried several options, for example this one:
>
> --------- begin-snippet-------------
>
>   #+ATTR_BEAMER: :overlay <1>
>   [[ file:figure1 ]]

[...]

The following works for me:

#+beamer: \only<1>{
[[file:figure1.png]]
#+beamer: }\only<2>{
[[file:figure2.png]]
#+beamer: }\only<3->{
[[file:figures3.png]]
#+beamer: }

Not pretty but...
HTH,
eric
-- 
: Eric S Fraga (0xFFFCF67D), Emacs 24.4.50.2, Org release_8.2.6-923-g233c11

Re: Overlay in beamer?

[Giuseppe Lipari]

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Dear Eric,

thank you for your very fast answer!

I solved by using directly latex code, but I will also consider your
solution.

Since overlays are very much used in beamer, I was just wondering if it
would be easy (or even desirable) to add one more property to ATTR_LATEX
(or ATTR_BEAMER), so to specify overlays for figures ... something like

#+ATTR_BEAMER: :overlay <1->

(Was it available before? I just found this old thread:
http://stackoverflow.com/questions/6974560/how-do-i-use-overlay-specifications-for-lists-in-org-modes-beamer-export-featur
)

Thanks again,

Giuseppe Lipari


2014-04-30 17:10 GMT+02:00 Eric S Fraga <e.fraga@ucl.ac.uk>:

>
> [...]
>
> > I tried several options, for example this one:
> >
> > --------- begin-snippet-------------
> >
> >   #+ATTR_BEAMER: :overlay <1>
> >   [[ file:figure1 ]]
>
> [...]
>
> The following works for me:
>
> #+beamer: \only<1>{
> [[file:figure1.png]]
> #+beamer: }\only<2>{
> [[file:figure2.png]]
> #+beamer: }\only<3->{
> [[file:figures3.png]]
> #+beamer: }
>
> Not pretty but...
> HTH,
> eric
> --
> : Eric S Fraga (0xFFFCF67D), Emacs 24.4.50.2, Org release_8.2.6-923-g233c11
>



-- 
Giuseppe Lipari
RETIS Lab, CEIIC
Scuola Superiore Sant'Anna
via Moruzzi, 1
56127 Pisa
tel:   050 882030
fax:  050 882003
web: http://feanor.sssup.it/~lipari/
blogs: http://scacciamennule.blogspot.com
          http://okpanico,wordpress.com
          http://algoland.wordpress.com

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Re: Overlay in beamer?

[Eric S Fraga]

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On Wednesday, 30 Apr 2014 at 18:31, Giuseppe Lipari wrote:
> Since overlays are very much used in beamer, I was just wondering if it
> would be easy (or even desirable) to add one more property to ATTR_LATEX
> (or ATTR_BEAMER), so to specify overlays for figures ... something like
>

There is the BEAMER_ACT property that can be used to apply overlay
information on blocks but I don't think it's possible on individual
figures.  Of course, you could put each figure in a separate block.  The
following/attached will match what you had originally.


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#+options: H:1
* The slide
** figure 1
:PROPERTIES:
:beamer_act: <1>
:END:
[[file:chromosome.png]]
** figure 2
:PROPERTIES:
:beamer_act: <2>
:END:
[[file:diagram.png]]
** figure 3
:PROPERTIES:
:beamer_act: <3->
:END:
[[file:equation1.png]]

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What may not be easy or possible is to use the \only directive, which is
what I used in my previous response to you.
-- 
: Eric S Fraga (0xFFFCF67D), Emacs 24.4.50.2, Org release_8.2.6-923-g233c11

Re: Overlay in beamer?

[Suvayu Ali]

Hi Eric,

On Wed, Apr 30, 2014 at 06:00:53PM +0100, Eric S Fraga wrote:
> 
> What may not be easy or possible is to use the \only directive, which is
> what I used in my previous response to you.

You can always use the only environment.
<https://github.com/suvayu/.emacs.d/blob/master/org-mode-config.el#L215>

That said, I think overlays with only is not as smooth as with simple
overlay specifications to regular environments or macros like
\includegraphics, \item, etc.

As for an :overlay specification, I believe it is already supported but
only for lists (ox-beamer.el:725).  I would love to have that for images
too!

Cheers,

-- 
Suvayu

Open source is the future. It sets us free.