[Paraview] picking/widgets, events, ImageData -> plots

[Randy Heiland]

Utkarsh,

I've updated that page (http://mypage.iu.edu/~heiland/pv-stuff/) with my latest playing around.  Basically, I discovered the "Plot Over Line" filter which does sort of what I want - ability to plot a row in an ImageData.  However, I have a few questions:

1) why doesn't the plot dynamically update as I move (or as I move and then release the picked line source)?  It almost seems to update at random.  Does this have something to do with my PV Settings?  I do have "Auto Accept" on.

2) is there some way to constrain the line source to take on only integer Y values?  Basically, I only want to plot the exact values within the ImageData, no interpolation.

3) Instead of the Plot Over Line, I tried to use a VOI filter on the ImageData, thinking I might be able to extract just the row I wanted to plot, but saw that I am not allowed to specify a 1-D VOI.

thanks, Randy


On Oct 27, 2010, at 2:02 PM, Utkarsh Ayachit wrote:

> So what are you plotting in the plot view? Directly the data that's
> being selected or are you applying some other filter and then that's
> shown in the plot view?
> 
> Can you create your pipeline/view setup in ParaView itself and send me
> the screenshot. That will clarify the pipelines you're using.
> 
> Utkarsh
> 
> On Wed, Oct 27, 2010 at 11:59 AM, Randy Heiland <heiland at indiana.edu> wrote:
>> Time frame?  I'm an academic.  And you're offering free, open source software. :)  Let's just say +1 to a request list.
>> 
>> But beyond the selection functionality, is there some way to (dynamically) connect the selection to update a 2-D plot?  I can (sort of) already select a row in my ImageData, if I use a 3D view (http://mypage.iu.edu/~heiland/pv-stuff/).  But is there some magic to connect that selection to a port, that triggers an update to a plot window, etc?
>> 
>> -Randy
>> 
>> On Oct 27, 2010, at 12:26 PM, Utkarsh Ayachit wrote:
>> 
>>> Randy,
>>> 
>>> The 2D view by default uses a texture-based mapper for rendering the
>>> image slice. We haven't implemented the selection capability yet for
>>> this mapper (the same is true if you use slice representation in the
>>> 3D view). What is your time frame for this application? Maybe we can
>>> fast track adding support for selecting on image slices. An
>>> alternative is to create a frustum selection and that should work even
>>> in 2D view with slices.
>>> 
>>> Utkarsh
>>> 
>>> On Tue, Oct 26, 2010 at 2:08 PM, Randy Heiland <heiland at indiana.edu> wrote:
>>>> Hi all,
>>>> 
>>>> I'm trying to evaluate ParaView (3.8.1) as a possible framework/app for a tool we're trying to build (standalone, not client/server).  Our tool will primarily vis only static 2D ImageData.  We would like the ability to select a region of the ImageData, e.g. select an entire row, and have an X-Y plot be displayed in another window.  So, in this use case, one window (ImageData) remains static, but as a new row is selected, another window (plot/chart) is dynamically updated.  I'd welcome pointers to docs/examples and suggestions.
>>>> 
>>>> I did see this thread on widgets:
>>>> http://paraview.markmail.org/search/?q=mouse+event#query:mouse%20event+page:1+mid:iqhyx3k4ik6sk5ue+state:results
>>>> 
>>>> and I was also playing around with the Selection Inspector.  However it seems that this only works with a 3D window(?) which is actually something I'd like to avoid, in terms of the freedom to rotate the ImageData about X or Y.
>>>> 
>>>> thanks, Randy
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>>