Hi,
PNG is not supported yet on Windows - Openbabel was not compiled with it,
as there is no cairo package on Anaconda main channel for windows (note
you're using conda-forge).
Unfortunately this is also the case in bioconda, so for now there is no
better conda solution yet. I will revisit this issue and try to support PNG
files.
----
Pozdrawiam, | Best regards,
Maciek Wójcikowski
mac...@wojcikowski.pl
2017-05-31 11:06 GMT+02:00 Hongbin Yang <yanyangh...@163.com>:
> Hi，
>
> I installed openbabel via `conda install -c openbabel openbabel`.
>
> I wanted to draw the molecule like
> `pybel.readstring('smi','c1ccccc1').draw()`
>
> Then the error was raised:
> C:\Users\yanya\Anaconda2\lib\site-packages\pybel.pyc in draw(self, show,
> filename, update, usecoords)
> 615 formatok = obconversion.SetOutFormat("_png2")
> 616 if not formatok:
> --> 617 raise ImportError("PNG depiction support not found. You should "
> 618 "compile Open Babel with support for Cairo. See "
> 619 "installation instructions for more "
>
> ImportError: PNG depiction support not found. You should compile Open
> Babel with support for Cairo. See installation instructions for more
> information.
>
> The installed packages includes:
> libpng 1.6.28 vc9_0 [vc9] conda-forge
> pillow 4.0.0 py27_0
> pycairo 1.10.0 <pip>
> openbabel 2.4.1 py27_2 openbabel
> cairo 1.14.6 vc9_4 [vc9] conda-forge
>
> I have both pillow and (py)cairo. Why can't I draw the molecule ?
> I guess that if I followed the suggestion and compile it with suport cairo
> it will work. But I have to work with conda. Is there any better way?
>
> Sincerely,
>
> ------------------------------
> Hongbin Yang 杨弘宾
> Research: Toxicophore and Chemoinformatics
> Pharmaceutical Science, School of Pharmacy
> East China University of Science and Technology
>
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