Re: [Discuss-gnuradio] Time Raster- Linux

[Marcus Müller]

Hi Ellie,

not a silly question at all! And, first of all: Welcome to the GNU Radio
community!

With 32kS/s, it's taking quite some time to build up something visible,
"pushing" out the solid yellow, but for me, this works (see screenshot
attached).

So, this actually does sound like a bug, but I can't really put my
finger on where things might go wrong. A couple of ideas to try, sorted
by desperation:

* middle mouse button on time raster canvas, "stop", middle mouse, "start"
* middle mouse button -> autoscale
* mmb -> save image (& inspect image)

If none of that helps, my best guess is that this might have something
to do with the QWT version used – but as I've never saw that problem "in
the wild", that would surprise me a bit. Then again, the Time Raster
Sink is not the most popular (yet, one of the most helpful, I think)
signal visualization sink – so maybe this simply never came up.

Actually, the warning that the visualization window nearly hides reads:

 std::cerr << "Warning: QWT5 has been found which has serious
performance issues with raster plots."

and so, maybe the performance issue is so severe that you simply see
nothing.

Best regards,
Marcus

On 07.07.2016 03:26, Ellie White wrote:
>
> Hello!
>
>  
>
> I am a new GNU Radio user and I have a question about the QT GUI Time
> Raster sink in GNU Radio version 3.7.8.  I built a flowgraph (which is
> attached as a .grc file) with a source connected to both a QT GUI Time
> Sink and Time Raster. While the Time Sink displays the signal
> properly, the Time Raster is blank and shows no signal, as shown in
> the screen shot I included. I have tried to use the Time Raster tool
> on Ubuntu - version 15.10 (it is a virtual machine running in
> Windows), and cannot figure out why the time raster doesn’t appear to
> display a signal. Am I doing something wrong, or is this a known
> issue?  Thanks very much for your time and apologies if this is a
> silly question.
>
>  
>
> -Ellie
>
>
>
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time_raster_sink.png
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