QT GUI Time Sink text scale bug

GNU Radio
1

Can anyone confirm the QT GUI Time Sink has a time scale text bug when
working at low sample rates in 3.7.6git-188-gf60cd24f? Please see
below:

https://dl.dropboxusercontent.com/u/49570443/qt_time_scale_grc.png
https://dl.dropboxusercontent.com/u/49570443/qt_time_scale_plot.png
https://dl.dropboxusercontent.com/u/49570443/qt_time_scale.grc

Plot text should be “ms” instead of “sec”. No show stopper; just
confused me when working with very low rates.

Thanks,
Lou

2

Hi Lou,
yep, it looks exactly the same for me.
I think the text is statically set as “Time (sec)”, but QWT should
annotate the axis with a factor like 10^-3 automagically;
I’ll have a look at this, but most probably you’ll be faster than me
figuring things out (since you’re already at this :wink: ).

Greetings,
Marcus

3

Nope, not a QWT bug, as increasing the sample rate from 1k to 1.002k
achieves the desirable result.
Am experimenting with floating point rounding in
gr-qtgui/lib/timedisplayform.cc :slight_smile:

4

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Under certain circumstances the axis label was not updated
(essentially it seems to be: iff you set the sampling rate to 1k);
patched this away.

Lou, you can find the minimal changeset attached; it should work
against current maint and master.

Greetings,
Marcus

On 11/23/2014 08:16 PM, Marcus M. wrote:

out (since you’re already at this :wink: ).

https://dl.dropboxusercontent.com/u/49570443/qt_time_scale_plot.png

https://dl.dropboxusercontent.com/u/49570443/qt_time_scale.grc

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5

Marcus,

OK; dumb question. How do I apply that, other an editing the source
manually? I tried the following, but it didn’t like it:

cd /usr/local/src/gnuradio/
patch < 0001-qtgui-fixed-non-changing-from-sec-to-ms.patch

Thanks,
Lou

Marcus Müller wrote

Greetings,
Marcus

–
View this message in context:
http://gnuradio.4.n7.nabble.com/QT-GUI-Time-Sink-text-scale-bug-tp51400p51421.html
Sent from the GnuRadio mailing list archive at Nabble.com.

6

On 11/25/2014 04:08 AM, madengr wrote:

Marcus,

OK; dumb question. How do I apply that, other an editing the source
manually? I tried the following, but it didn’t like it:

cd /usr/local/src/gnuradio/
patch < 0001-qtgui-fixed-non-changing-from-sec-to-ms.patch

$ git apply foo.patch

M