[IPOL discuss] enabling conditional visualization in demos

[Juan Cardelino]

Hello Enric,
I'm answering interleaved.

On Tue, Aug 16, 2011 at 3:54 AM, eml <enric.meinhardt at cmla.ens-cachan.fr> wrote:
> Juan Cardelino <juan.cardelino at gmail.com>:
>
>> A) TOOLS ALLOWED FOR VISUALIZATION:
>
>> 1) imagemagick's convert:
>> *status: installed
>> *what do IPOL think about it?: I don't know
>> *use: animating gifs for level set evolution for example
>
> While less comfortably than using convert, animated gifs can be
> already created using PIL.  See the file gifmaker.py in the PIL
> distribution for an example.
>

Didn't know about that. thanks.

>
>> 2)Graphviz (i.e. dot command line option)
>> *status: not installed
>> *what do IPOL think about it?: I don't know
>
> I think that graphviz is extremely standard and useful, and should be
> allowed, at least in the conditional sense that you describe below.
>

ok.

>> C) IMPLEMENTATION OF OPTIONAL VISUALIZATION OF GRAPHS
>
>> Regarding the code to implement that, at the moment my app.py looks like this:
>>
>>        p1 = self.run_proc(['qnm','ms_tree_vec_demo',
>> str(a),str(2),self.input_fname, 'output.tr', 'init_part.part'])
>>        self.wait_proc(p1)
>>
>>        p2 = self.run_proc(['qnm','ms_apply_treei_color','output.tr',self.input_fname,
>> str(lzero), 'output.png'])
>>        self.wait_proc(p2)
>>
>>        if (self.use_visualization):
>>            p3 = self.run_proc(['qnm','partition_to_dot_fancy',
>> 'init_part.part',self.input_fname,'init_part.dot'],
>> stdout=stdout_file, stderr=stdout_file)
>>            self.wait_proc(p3)
>>            p4 = self.run_proc([self.tool_neato, '-n2','-Tpng', '-O',
>> 'init_part.dot'],stdout=stdout_file, stderr=stdout_file)
>>            self.wait_proc(p4)
>>        return
>
> Let me propose a possible approach to solve this problem.
>
> The variable "self.use_visualization" should start as true, and then
> be set according to the output status of the "neato" command.  If the
> command fails (because graphviz is not installed) this variable
> becomes false.  Later, this variable is passed to the template to
> enable/disable a piece of html:
>

Yes, that's exactly what I had in mind, but was too lazy to implement it.

> %if use_visualization
>   <!-- html snippet that displays the graph -->
> %endif

Thanks, that's what I needed to finish the demo!