# Re: [O] Help with beamer environments + org-special-blocks!

Hi Vikas,

Vikas Rawal wrote:
> I am trying to use textpos to position images at specific location on
> a frame.

I now use TikZ to do that. I have the impression it is easier. Though, I have
the real impression of writing LaTeX inside an Org buffer... which I dislike.
I'd like to write text as text, and still get the ability to convert that to
HTML, for review, even if the layout wouldn't be (at all) the same.

> I would like something like this in the beamer export:
>
> \begin{textblock}{10}(3,3) \visible <2-> {
> \includegraphics[width=.9\linewidth]{scatterplot2.png}
> } \end{textblock}
>
> I have defined the following beamer environment.
>
>              '("textpos1" "w" "\\begin{textblock}{%h}(3,3) \\visible %a {" "}
> \\end{textblock}"))

You normally could use such a block (the old "org-special-blocks", now
integrated in Org 8 -- thanks Nicolas):

--8<---------------cut here---------------start------------->8---
#+begin_textblock
Contents
#+end_textblock
--8<---------------cut here---------------end--------------->8---

> The problem is (3,3) is fixed in the above specification. How can I
> specify it for a given headline? I have tried various ways of
> generalising this but nothing seems to work.
>
> For example, if I use the following:
>
>              '("textpos1" "w" "\\begin{textblock}%h \\visible %a {" "}
> \\end{textblock}"))
>
> and write the headline as {10}(3,3), I get \{10\}(3,3) in beamer
> export rather than {10}(3,3).

Though, the problem stays the same with what I think is the right way to do
it...

See how Org gets converted to LaTeX:

--8<---------------cut here---------------start------------->8---
#+begin_myenvironment                   \begin{myenvironment}
Test of a new                           Test of a new
environment.                            environment.
#+end_myenvironment                     \end{myenvironment}
--8<---------------cut here---------------end--------------->8---

That's OK. But the environment had no parameters.

--8<---------------cut here---------------start------------->8---
#+begin_myenvironment{3}                \#+begin\_myenvironment\{3\}
Test of a new                           Test of a new
environment.                            environment.
#+end_myenvironment                     \#+end\_myenvironment
--8<---------------cut here---------------end--------------->8---

That's completely invalid LaTeX.

--8<---------------cut here---------------start------------->8---
#+begin_myenvironment {3}               \begin{myenvironment}
Test of a new                           Test of a new
environment.                            environment.
#+end_myenvironment                     \end{myenvironment}
--8<---------------cut here---------------end--------------->8---

That's valid LaTeX, but the arguments of the environment have been ignored!

IIRC, that's how we did before, with the original org-special-blocks' file.

> How does one use the escape %o? I have looked through ox-beamer.el,
> worg and mailing list archives, but could not find a clear
> explanation. Will be grateful for a pointer.

I've no idea. I wonder as well how we do this.

Best regards,
Seb

--
Sebastien Vauban

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