[Paraview] Blog: matplotlib View coming in ParaView 4.1

[Aurélien Marsan]

Hi Cory,

Sorry for the delay,

Sometimes, I suppose that I would like to be able to just plot some
matplotlib graphics from the programmable filter, as if it were a standard
python script. No matter if the window is included or not within the
paraview interface. A simple matplotlib window -- like when we do show() in
a simple python script -- would then do the job.

Below is a script that illustrates what I have in mind, and that would be
inserted in a ProgrammableFilter

import postproc_module as pm      *# this is a module, with classes etc.,
> that do all the post-treatment that I want. I use it both inside and
> outside Paraview. (programmable filter / sources and simple python script)*

data = self.GetInput()
> *# Get the input of the programmable Filter, say a multiblock structured
> mesh *wall = pm.Extractor(input = data, "i=imax").get_output()
> *# Extract the wall -- behind the class is the vtkSubset function*pm.SomeMagicalClassThatPerformsSomeMagicalOperationAndOutputsGraphics(input
> = wall, array = "ps", save_result = "some_path/some_file")      *# that
> class could perform some advanced post-processing, using scipy, numpy, and
> finally display some result in a matplotlib window. *
> pm.SetOutput(self, data)      *# just put the input data as output data
> of the filter. *


Do not hesitate to ask if this is not clear.

Best regards,

Aurélien



2013/12/17 Cory Quammen <cory.quammen at kitware.com>

> Auré Lien,
>
> Thanks for the feedback,
>
> The Python View could certainly consume output from a
> ProgrammableFilter. Did you have another way in mind to use matplotlib
> from within a programmable filter? I don't think anything would stop
> you from doing so, but to have any matplotlib plots show up in a
> ParaView window, you would need to have your matplotlib code in the
> Python View script.
>
> You can access the Python View from the Python shell, but it might be
> a little awkward. You would have to set the script in the Python View
> as a string, e.g.
>
> >>> view =paraview.simple.CreateView("PythonView")
> >>> view.Script = """
> ... def setup_data(view):
> ...   print "setup_data"
> ...
> ... def render(view, figure):
> ...   print "render"
> ... """
>
> You could imagine loading a matplotlib script this way, perhaps.
>
> Best,
> Cory
>
> On Tue, Dec 17, 2013 at 10:08 AM, Aurélien Marsan <aur.marsan at gmail.com>
> wrote:
> > Wow ! So great ! A very popular python feature that was missing in
> Paraview.
> >
> > Juste one question : will matplotlib also be directly accessible from a
> > ProgrammableFilter or from the python console ?
> >
> > Many thanks,
> >
> > A. Marsan
>
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