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Re: [Discuss-gnuradio] Showing a time-varying quantity in GNU Radio (wit

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] Showing a time-varying quantity in GNU Radio (with qtgui)
Date: Wed, 19 Jan 2011 01:12:04 -0500
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20101027 Fedora/3.0.10-1.fc12 Thunderbird/3.0.10

> Dear all,
> I'm implementing a GUI to show the time-varying wireless channel gain
> with qtgui.
> To be specific, I want to implement is a history plot.
> The X-axis is discrete time and the Y-axis is a channel gain.
> And the plot should be updated (refreshed) every few seconds. 
> ( for example http://qwt.sourceforge.net/cpuplot.png )
> I've tried with qtgui.sink_f() block.
> But, the basic option 'plottime' is not appropriate for this purpose.
> Is there any other way to implement it?
I can't speak for QtGui, but under the Wx gui, you can select the
"Stripchart" trigger method,
  which will produce the behaviour you're looking for.

Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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