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Re: [Discuss-gnuradio] Waterfallsink

From: Johnathan Corgan
Subject: Re: [Discuss-gnuradio] Waterfallsink
Date: Sat, 23 Feb 2008 17:41:39 -0800

On 2/23/08, Tobias Gresch <address@hidden> wrote:

>  For example when I execute usrp_fft.py with the -W option I do not get
> a waterfall graph as expected but instead of having the spectra moving
> down slowly the actual spectrum is drawn over the whole height of the
> graph.
> I tried to track down the problem and it appears that the bitmap is copied
> correctly to shift it one down but later gets overwritten (see [1]) because
> the height value of 1 in the method dc1.DrawRectangle() is somehow too
> small. If I set it to 2, i.e. dc1.DrawRectangle(x_pos*p_width, 0, p_width,
> 2),
> it works.

Good catch.

I've confirmed this behavior and the fix in a similar configuration.
It looks like a wxGTK-2.6 vs. wxGTK-2.8 issue.

> ps. In waterfallsink2.py in the class waterfall_window make_colormap(self)
> is defined twice. [2]

Noted, and fixed as well.

Johnathan Corgan
Corgan Enterprises LLC

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