Re: [Discuss-gnuradio] qt_gui_time

On 03/12/2019 07:00 PM, Wayne Hilliard wrote:

Sure it's not much but it proves the concept.

One thing I think I'm going to try is to instead of using a vector probe I want to use a single probe then rotate the vector to the left sand concatenate the new value onto the end. But this will get you going.

The "trick" to the desired goodness is that you make some "helper code" (via the Python Module block--very powerful way to achieve
  procedural "stuff" without actually writing python blocks).

So, imagine, in your flow graph, that your 'fprobe' is actually for a scalar value
  (like, say, the heavily-filtered-and-decimated result of complex-to-mag**2).

You then have a your "vec1" variable be the output of some function you call in your helper code:

helper_code.my_funky_function(fprobe)

Then, "my_funky_function" can actually return a vector of some desirable size (perhaps passed as a function argument).

That vector can be your "shift register" strip-chart type thingy.

This strategy is something I use quite a bit.  Some might (probably rightly) argue that some of what I do is a "substitute" for writing an
  actual signal-processing block.  But my code generally operates on the output of "probe" blocks, generally sampled at *vastly* lower rates
  than the input sample rate--like 1Hz, maybe more, depending on what I'm doing.

Once you get really comfortable with this idiom, it becomes really quite powerful...

On Tue, Mar 12, 2019 at 10:38 PM Joe Martin <k5so@k5so.com> wrote:

Congratulations Wayne.  I've been trying to implement it but I am having difficulty getting it to work.  Would you mind sharing your test GRC program with me so I can see how you accomplished it please?

I would much appreciate it, 

Joe

On Mar 12, 2019, at 4:29 AM, Wayne Hilliard <woodycxd@gmail.com> wrote:

Thanks everyone for the replies. Huge help.

Kudos to Marcus Leech for the suggestion. Seems to work wonderfully. At least in my test GRC file. Now to implement into my own program.

Cheers!

Wayne Hilliard

On Sun, Mar 10, 2019 at 10:26 PM Marcus Müller <mmueller@gnuradio.org> wrote:

Hi Wayne, Hi Joe,

you're right – we've been urging people to switch away from WX since at
least 2014, and now we're finally removing it; with a bit of a heavy
heart, to be honest: Without feature equality, removing an alternative
feels bad, but we simply couldn't maintain the WX code anymore, and had
to find the resources to maintain QT stuff first.
So, no, we don't have that specific visualization in Qt, sorry. Joe,
this means we've long stopped supporting your widget – it works on most
machines, on others it doesn't, and we can't really help you in the
latter case.

Now, would one get started with developing a strip chart for Qt? Either
one cheats a bit and just implements something that hands n_points
sized chunks of data to the Qt GUI time sink, which always are
basically the last chunk, with old samples "shifted out" and new
samples "shifted in", or one would actually go and do a deep C++/Qt
dive and write a proper stripchart widget.

Best regards,
Marcus

On Sun, 2019-03-10 at 16:12 -0600, Joe Martin wrote:
> Hi Wayne,
>
> I am using the strip-chart option of the WX GUI Scope Sink block in
> GRC to perform drift scans in my radio astronomy project.  Works like
> a champ!
>
> Select "Stripchart" in the Trigger option.
>
> Regards,
>
> Joe
>
> > On Mar 10, 2019, at 3:24 PM, Wayne Hilliard <woodycxd@gmail.com>
> > wrote:
> >
> > Hello,
> > Question. Has there been any movement on adding a strip chart
> > option to this gui?
> >
> > I know WX_gui usage is discouraged and i have a radio astronomy app
> > I've been working on that uses QT_Gui.
> >
> > I've looked around some on github and don't have a clue on where I
> > would start to try something on my own.
> >
> > Any help would be appreciated .
> > Thanks in advance!!
> >
> > Wayne Hilliard
> > _______________________________________________
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