From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeremie Juste <jeremiejuste@gmail.com>
Subject: =?UTF-8?B?UmU6IG5vIG1vcmUgdGlreiAtPiBwbmcgZ8OpbsOpcmF0aW9uIGR1?=
 =?UTF-8?B?cmluZyBIVE1MIGV4cG9ydA==?=
Date: Sun, 14 Oct 2018 23:01:26 +0200
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To: =?utf-8?B?w4lyaWMgV8O8cmJlbA==?= <eric.wurbel@univ-amu.fr>
Cc: emacs-orgmode@gnu.org


Hello

With the following in your .emacs file 

#+BEGIN_SRC 
  (setq org-babel-latex-htlatex "htlatex")
  (defmacro by-backend (&rest body)
    `(case org-export-current-backend ,@body))
#+END_SRC

I can put back #+BEGIN_SRC around the tikz and it seems to work.

#+header: :file (by-backend (html "images/graphic2.png") (t 'nil))
#+header: :imagemagick
#+header: :results (by-backend (pdf "latex") (t "raw"))
#+BEGIN_SRC latex
\begin{figure}[ht]
\centering
\begin{tikzpicture}[xscale=0.5]
    % draw the sets
    \filldraw[fill=none, draw] (-1.5,0) circle (1cm);
    \filldraw[fill=none, draw] (1.5,0) circle (1cm);

    % the texts
    \node at (-1.5,1.5) {$E$};
    \node at (1.5,1.5) {$F$};

    % the points in the sets (here I just create nodes to use them later on to position
    % the circles and the arrows
    \node (a) at (-1.5,0.7) {$a$};
    \node (b) at (-1.5,0.1) {$b$};
    \node (c) at (-1.5,-0.4) {$c$};
    \node (1) at (1.5,0.7) {$1$};
    \node (2) at (1.5,0.1) {$2$};
    \node (3) at (1.5,-0.4) {$3$};

    % draw the arrows
    \draw[->] (a) -- (2);
    \draw[->] (c) -- (2);
    \draw[->] (b) -- (1);
\end{tikzpicture}
\end{figure}
#+END_SRC

Best regards,

Jeremie