Re: Regarding Babel execution

[tsd@tsdye.com (Thomas S. Dye)]

Aloha Gunnar Wolf,

Gunnar Wolf <gwolf@gwolf.org> writes:

> Hi,
>
> I recently switched from having several Graphviz files to inlining
> them via Babel in my source Org file. However, I noticed something
> that might either be strange, or might just mean I don't yet
> understand some stuff (as a relative newbie): I usually follow this
> pattern to include my graphics:
>
>     #+begin_center
>     #+attr_html: height="350"
>     #+attr_latex: width=0.5\textwidth
>     [[./img/foo.png]]
>
>     This is the caption for foo.png
>     #+end_center
>
> But if I try to replace this [[./img/foo.png]] with a
> «#+begin_src dot» block, it does not get picked up by Babel (and ends
> up in the generated document as a syntax-highlighted block — So,
> clearly, org-mode understands it's a source block, but Babel ignores
> it).
>
> I currently commented out the #+begin_center and #+end_center
> statements, but I'd really like to have them back. Or, at least, to
> find a more proper way to mark the images (and captions!) as material
> that should be distinguished from the flowing text. Something along
> the lines of the LaTeX «figure» environment.

If you use #+caption:, then the image will be wrapped in a figure
environment when it is exported to latex.  See the Org manual at 12.6.5
"Images in LaTeX export."

Here is an example using the a dot source code block and the "new
exporter" which currently resides in contrib/.

#+name: fundamental-model
#+header: :exports results
#+header: :file fundamental-model.pdf
#+BEGIN_SRC dot
  graph G
        {
        graph [margin="0.01"];
          d [label = "Dated event", shape ="box"];
          t [label = "Target event"];
          d -- t [label = "Association", dir = "both", len = 2];
          {rank=same; d t;}
          }
#+END_SRC

#+CAPTION[The fundamental relationship of a chronological model]: *The fundamental relationship of a chronological model based on radiometric dating.*
#+ATTR_LaTeX: :options "width=232pt" :placement "[ht!]" :comment-include t
#+NAME: fig:fundamental
#+RESULTS: fundamental-model
[[file:fundamental-model.pdf]]

If you use the "old exporter" (which I believe you are using), then you
will need to use LaTeX attributes different than those I've shown, but
you have these working already, so should be in good shape.  Also, the
#+caption: syntax is a bit different between the two exporters.  For the
old exporter, see the Org manual or
http://orgmode.org/worg/org-tutorials/org-latex-export.html#sec-10-4.

hth,
Tom

-- 
Thomas S. Dye
http://www.tsdye.com