Re: [babel] Including TikZ diagrams as figures in export

[Andreas Leha <andreas.leha@med.uni-goettingen.de>]

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Hi Jeffrey,

the attached sample file works for me.

The html is only sub-optimal, though, as it just includes a link to a
pdf file.

Cheers,
Andreas



Am 21.02.2011 02:56, schrieb Erik Iverson:
> Jeffrey,
>
>> Now, I'd like to integrate them into an org document. I'd like:
>> 1) To use babel to handle the TikZ source
>
> This is possible.
>
>> 2) To wrap the resulting drawing in a figure environment for
>> automatic numbering and centering
>
> See
> http://orgmode.org/worg/org-contrib/babel/languages/ob-doc-LaTeX.html
> and search for "tikz" for an example.  I think you do need to use the
> :file argument
> for this to have org-mode take care of it automatically.
>
> Alternatively, you could just include *all* the latex you want, including
> constructing your own figure environment and caption and refs, in the
> latex
> code block.
>
>> 3) To be able to refer to the figure elsewhere in the document
>
> Should be possible with either approach above.
>
>> 4) (optional) To be able to seamlessly export to both LaTeX and HTML
>
> So should the HTML exporter generate a PNG file then, as opposed to PDF?
> This is possible, but requires some 'conditional' elisp code in your
> :file
> source block argument.  I think I can help if that's indeed what you
> want.
>
>> And somewhat unrelated, is ":results" now deprecated in favor of
>> ":exports"? What about ":file"? I'm sufficiently new to babel that
>> these all seem like they could be taken care of with a single header
>> argument with many options...
>
> Not deprecated at all according to my understanding:
>
> :results determines how the results are collected from a process. So,
> in R, we
> might want the standard output ':results output' or we might just want
> the last
> value returned by the code block, ':results value'.  This determines
> what is
> inserted into the org-mode buffer or the export stream when the code
> block
> is evaluated.
>
> :exports determines if the code and/or the results will be inserted upon
> exporting. *If* the results are inserted, then :results will determine
> how.
>
> :file is useful for code blocks that generate graphical output, such
> as tikz.
> This will divert the output into the named file, and exporting will
> insert
> that file.  In the org-mode buffer, a link will be inserted. If a png
> file is
> generated, it can even be displayed inline in the org-mode buffer if
> you turn
> on that functionality.
>
>
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#+LATEX_HEADER: \usepackage{tikz}

* Tikz Sample
  In figure \ref{fig:tikz_sample} you can see something.
  
  #+srcname: tikz_sample
  #+begin_src latex :exports (if (eq backend 'latex) "none" "results") :file tikz_sample.pdf :headers '("\\usepackage{tikz}")
    \usetikzlibrary{arrows}
    \tikzstyle{int}=[draw, fill=blue!20, minimum size=2em]
    \tikzstyle{init} = [pin edge={to-,thin,black}]
    
    \begin{tikzpicture}[node distance=2.5cm,auto,>=latex']
        \node [int, pin={[init]above:$v_0$}] (a) {$\frac{1}{s}$};
        \node (b) [left of=a,node distance=2cm, coordinate] {a};
        \node [int, pin={[init]above:$p_0$}] (c) [right of=a] {$\frac{1}{s}$};
        \node [coordinate] (end) [right of=c, node distance=2cm]{};
        \path[->] (b) edge node {$a$} (a);
        \path[->] (a) edge node {$v$} (c);
        \draw[->] (c) edge node {$p$} (end) ;
    \end{tikzpicture}
   #+end_src

   #+begin_src latex :noweb yes
     \begin{figure}
       \centering
       <<tikz_sample>>
       \caption[Tikz]{Tikz}\label{fig:tikz_sample}
     \end{figure}
   #+end_src

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