Tikz ugly hack

[edgar <edgarlux@cryptolab.net>]

Dear Org users,

I just want to share a way to combine Tikz (LaTeX) with figures (svg, 
png...). This may be needed to add elements (e.g. annotations) to your 
figure. The figure may still be exported with other back-ends (without 
annotations). If you know of a better way of doing this, please, let me 
know. Thanks.

#+latex_header: \usepackage{adjustbox,tikz}
#+latex_header: \newcommand*{\DrawGrid}{\draw[step=.2cm,help lines] 
(current bounding box.south west) grid (current bounding box.north 
east);}
#+latex_header: \newcommand*{\DrawBoundingBox}[2]{% 
https://tex.stackexchange.com/a/542819
#+latex_header:     \draw [red, very thick, rounded corners]
#+latex_header:     ([shift={(#1)}]current bounding box.south west)
#+latex_header:     rectangle
#+latex_header:     ([shift={(#2)}]current bounding box.north east);}
#+begin_export latex
\begin{tikzpicture}
   % left bottom right top
   \node {\adjustbox{height=0.7\textheight,trim=45.6mm 0mm 155mm 20mm, 
clip=true}{
#+end_export
   #+attr_latex: :height "" :width "" :options "" :center nil
   [[file:../diagram.svg]]
#+begin_export latex
   }};
   \DrawBoundingBox{5.7cm,0.71cm}{-0.1cm,-3.6cm}
   % \DrawGrid
\end{tikzpicture}
#+end_export