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Re: [Discuss-gnuradio] QT Time Raster in OSX 10.10.4 Not Rastering

From: Tom Rondeau
Subject: Re: [Discuss-gnuradio] QT Time Raster in OSX 10.10.4 Not Rastering
Date: Tue, 1 Dec 2015 10:01:56 -0500

On Wed, Nov 25, 2015 at 1:05 PM, Paul Garver <address@hidden> wrote:

Thanks for the info. I could see a reimplementation as a good project for some CS undergrads here at GT. Is there a particular way the QT time raster should be rewritten (e.g. using particular libraries, QT versions, etc) to be OS X compatible and align with the future direction of QT plots in GR?  Or is the issue more complicated than just a port/reimplementation? I personally find the raster extremely useful for analysis. 


Hi Paul,

If there's any work to be done here, we'd want to keep it just in the QT and QWT family so we don't add on any more dependencies for this. If the raster plot can be fixed under QWT5, then great, we should do that. However, we're trying to move on to support QWT6 only, which will be true for GR 3.8. For OS X, the main impediment is the gr_filter_design tool, which uses PyQWT that forces the use of QWT5. I have an 80% solution to fixing this by adding other support to the filter design tool for QT 4 and QT 5:


There needs to be some work on the look and feel of the new backends, though, such as manipulation of the pole-zero plot. If we can get this finished, we can probably drop PyQWT from the macports installation and update the dependency there to QWT6.


On Nov 25, 2015, at 9:16 AM, Tom Rondeau <address@hidden> wrote:

On Wed, Nov 25, 2015 at 10:08 AM, Paul Garver <address@hidden> wrote:
The QT Time Raster GUI doesn’t appear to function in the latest gnuradio-devel macports. The plot appears all a single color although the bits into the graph are not constant. I run the same flow graph on my Ubuntu setup and I get the rastered bits plotted as expected. I’m using:

 gnuradio-devel @20151111_0+docs+grc+jack+portaudio+qtgui+sdl+swig+uhd+wavelet+wxgui
OSX 10.10.4

Simple example: Raster some bits with the gr_time_raster_b
 gr_time_raster_b bits.b8

Using Volk machine: avx_64_mmx_orc
Warning: QWT5 has been found which has serious performance issues with raster plots.
         Consider updating to QWT version 6 to use the time raster GUIs.

The problem with this warning is that it appears it is nontrivial to use QWT6 with OSX on the current gnuradio builds.

Does anyone else have this problem? Does it work in the gnuradio (non-devel) port?



Yes, we understand the problem with OS X and QWT5 here. The main problem is the PyQWT issue, which we've gotten out of the way for the most part, but there are still some problems that Dickens has faced with moving away completely. The thought was to give up the raster in favor of the other things it enables. 

It's also quite possible that the QWT5 problem with the raster plotting is simply due to bad coding on my part.


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