Re: Block level specification for tex code html export method

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

Hi Haochen,

Thanks for following that up!

Haochen Xie <haochenx@acm.org> writes:
> ​Hello
> Alan,
>
> I'm not 100% sure, but I think the distorted PNG file is generated by dvipng. It seems that dvipng cannot handle tikz blocks very well, and one must use imagemagick for those blocks. I
> think this line:
>
> #+header: :imagemagick :iminoptions -density 600 :imoutoptions -geometry 800
>
> should be
>
> #+header: :imagemagick yes :iminoptions -density 600 :imoutoptions -geometry 800
>
> so that imagemagick would be used instead of dvipng, which is the global default.

Thanks for that!  I'll keep that in mind.

Regards,
Andreas




>
> As said by Andreas, 
> ​it's probably that ​
> your
> ​​ by
> ​​-backend
> ​​ macro
> ​​ 
> ​is not working​
> properly, or, maybe you are not using a recent enough version of org-mod
> ​​e
> ​​. This
> ​​ 
> ​​magic
> ​, if I remember correctly,​
> ​​ 
> ​​is
> ​​​​ 
> ​​act
> ​​​​uall
> ​​​​​​​​​​​​​​​​​​​​​​​​​​​​​y​
> ​​ done
> ​​ by
> ​​ a
> ​​ special
> ​​ case
> ​​ added
> ​​ to
> ​​ some
> ​​ latex
> ​​ babel
> ​​ export
> ​​ function
> ​​, wh
> ​​ich is contributed by Andreas somehow recently. You may want to try upgrade your org-mode and try again.
>
> Also please follow this link [1] to fix a 
> ​bug
> in htlatex as mentioned in Andreas's mail, or your html export will fail silently (showing success on emacs, but no images generated).
>
> [1] http://tex.stackexchange.com/a/232739
>
> --
>
> Mail from Haochen Xie
>
> On Thu, Sep 3, 2015 at 9:30 PM, Andreas Leha <andreas.leha@med.uni-goettingen.de> wrote:
>
>
>  Hi Alan,
>
>  Glad you like the example.
>
>  Three things:
>  1. It still works for me ;-)
>  2. The distorted png might come from the bug in htlatex I mentioned in
>  this thread [1].
>  3. It seems that the by-backend does not work properly for you. I am
>  not sure about the reason for that. What org-mode version do you run?
>
>  HTH,
>  Andreas
>
>  [1] http://tex.stackexchange.com/a/232739
>
>  Alan Schmitt <alan.schmitt@polytechnique.org> writes:
>  > Hello Andreas,
>  >
>  > I’m slowly catching up on the org mailing list, and I found your example
>  > very interesting. I tried to run it and it does not seem to work here.
>  > Here is what I did:
>  > - I copied the code below to a file
>  > - I evaluated the last block
>  > - I made sure that latex was one of the org-babel-load-languages
>  > language
>  > - I tried executing the first block, which generated this strange png
>  >
>  >
>  >
>  > - I exported both to html and pdf, and in both cases I would have
>  > a reference to the png instead of the svg/tikz code.
>  >
>  > I’m afraid I’m missing a step. Do you see what I’m doing wrong?
>  >
>  > Thanks,
>  >
>  > Alan
>  >
>  > On 2015-08-12 10:50, Andreas Leha <andreas.leha@med.uni-goettingen.de> writes:
>  >
>  >> #+LATEX_HEADER: \usepackage{tikz}
>  >>
>  >> First execute the second code block, to define the convenience macro
>  >> and to set the required new variables in ob-latex.el. Then export to
>  >> HTML and to pdf to see the tree exported as an SVG image and as
>  >> embedded tikz respectively.
>  >>
>  >> * Tikz test
>  >> Here's a tree, exported to both html and pdf.
>  >>
>  >> #+header: :file (by-backend (html "tree.svg") (latex "tree.tikz") (t "tree.png"))
>  >> #+header: :imagemagick :iminoptions -density 600 :imoutoptions -geometry 800
>  >> #+header: :results file raw
>  >> #+header: :fit yes
>  >> #+begin_src latex
>  >> \usetikzlibrary{trees}
>  >> \begin{tikzpicture}
>  >> \node [circle, draw, fill=red!20] at (0,0) {1}
>  >> child { node [circle, draw, fill=blue!30] {2}
>  >> child { node [circle, draw, fill=green!30] {3} }
>  >> child { node [circle, draw, fill=yellow!30] {4} }};
>  >> \end{tikzpicture}
>  >> #+end_src
>  >>
>  >> #+results:
>  >> [[file:tree.png]]
>  >>
>  >> * COMMENT setup
>  >> #+begin_src emacs-lisp :results silent
>  >> (setq org-babel-latex-htlatex "htlatex")
>  >> (defmacro by-backend (&rest body)
>  >> `(case (if (boundp 'backend) (org-export-backend-name backend) nil) ,@body))
>  >> #+end_src