Re: [Discuss-gnuradio] qt_gui_time

[Joe Martin]

Marcus and Marcus, 

All understood.  I will try to implement an alternative strip chart 
functionality in my flowchart program as Marcus L. Indicated is possible using 
the Qt Time Sink, Qt Vector Sink, and Vector Add Const  blocks to replace my 
currently working WX version.  Interesting.

Thanks for the info!

Joe

> On Mar 10, 2019, at 5:09 PM, Marcus D. Leech <address@hidden> wrote:
> 
> 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 <address@hidden>
>>>> 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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