Re: [Discuss-gnuradio] qt_gui_time

On 03/10/2019 06:26 PM, Marcus Müller 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
I use the Qt Vector sink for strip-charts.

All the strip-chartiness is handled in helper code, and the Vector just
shows vectors at strip-chartly low rates.

My spectro_radiometer app does this.

Basically, feed a Qt Vector sink from an vector-add-const block which is
being feed a stream of zeros. On a regular basis, via the magic
of function probes, update the "constant" that is added. That vector
constant is the strip-chart contents. The Vector sink doesn't even
know that it's acting as a stripchart function. Easy-peasy, and
nothing special required in Qt land other than what's already there.

I implemented the strip-chart functionality in the Wx widgets all those
years ago. It was a bit of a hack then, and I'm kinda happy to see
the Wx widgets going away. They had portability issues, and often
also had horrendous performance issues.

>
> 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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