Re: Should 'splot' and 'plot' treat NaN data differently?

[sfeam <sf...@us...>]

On Tuesday, 29 October 2013 10:20:27 PM Dima Kogan wrote:
> Ethan A Merritt <sf...@us...> writes:
> 
> > On Monday, 28 October, 2013 23:32:10 Dima Kogan wrote:
> >>
> >> I'm not against either of these behaviors, but I think them being
> >> different is a bug. Thoughts?
> >
> > Look for a fix soon.
> 
> Hi Ethan. I tested the code after your commit, and it appears to fix the
> issue. Thank you very much.
> 
> I'm now seeing another related, but new problem. The coloring of the
> +inf/-inf is now the same in every configuration I tested (black,
> yellow). The coloring of the nan, however can vary.
> 
> I looked at 3 different terminals: x11, wxt, qt. For each, I ran the
> test script posted earlier in this thread. I did a 2d plot, an splot
> with 'set view map' and an splot with a 3d view. The colors of the nan
> were as follows:
> 
> |     | splot, view map | splot, 3d view | plot        |
> |-----+-----------------+----------------+-------------|
> | x11 | ** black **     | white          | ** black ** |
> | wxt | white           | white          | white       |
> | qt  | white           | white          | white       |
> 
> Here "white" really means "transparent". A quick glance suggests there
> may be a bug in the x11 terminal. What do you think?

As you say, it's supposed to be transparent.
But x11 doesn't do transparency, so transparent pixels come
out as black in image/rgbimage mode.

As shown in the imageNaN demo, if you use "failsafe" image mode
then gnuplot can work around the lack of alpha channel support by
simply not drawing that pixel at all.  That works for your test case also.

So no, I don't think there is a bug.

	Ethan



> 
> Thanks again.
> 
> dima
> 
> 
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