Hi,
On Mon, Aug 22, 2022 at 01:33:45PM +0000, Ed . wrote:
> Hi Luis,
>
> Glad to hear it! Could you share the code you’ve used? It might make a great
> demo to add to P:G:Gnuplot.
The following code plots two opaque vertical bars, a black one on the
left and a red one on the right. On top of that it plots two
semitransparent horizontal bars, a black one at the bottom and a green
one on top. I enclose the result: As expected, I get black on
the bottom left corner, red on the bottom right, and green on the top
left. I get some kind of yellow on the top right corresponding to the
red bar seen trough the semitransparent green bar.
use PDL;
use PDL::Graphics::Gnuplot;
my $a=zeroes(2,2);
gplot({terminal=>"pngcairo", output=>"rem.png"},
with=>"rgbalpha",$a->xvals, $a->yvals,
255*$a->xvals, $a->zeroes, $a->zeroes, 255*$a->ones,
with=>"rgbalpha",$a->xvals, $a->yvals,
$a->zeroes, 255*$a->yvals, $a->zeroes, 127*$a->ones);
I tried the "png" terminal, instead of "pngcairo" but it failed.
The interactive terminal 'qt' does work and it exports correctly to
png.
I guess I don't fully understand gnuplot. I tried the plot above but
directly from gnuplot,
gnuplot> plot 'rem.txt' u 1:2:3:5:5:7 w rgbalpha
gnuplot> replot 'rem.txt' u 1:2:5:4:5:6 w rgbalpha
where rem.txt contains the data
0 0 0 0 0 127 255
0 1 0 255 0 127 255
1 0 255 0 0 127 255
1 1 255 255 0 127 255
and the code worked with the interactive 'qt' terminal, yielding the
same image as the one enclosed, but
gnuplot> set term 'pngcairo'
gnuplot> set out 'rem1.png
gnuplot> plot 'rem.txt' u 1:2:3:5:5:7 w rgbalpha
gnuplot> replot 'rem.txt' u 1:2:5:4:5:6 w rgbalpha
gnuplot> set out
failed! (only the red image was plotted).
Regards,
Luis
--
o
W. Luis Mochán, | tel:(52)(777)329-1734 /<(*)
Instituto de Ciencias Físicas, UNAM | fax:(52)(777)317-5388 `>/ /\
Av. Universidad s/n CP 62210 | (*)/\/ \
Cuernavaca, Morelos, México | [email protected] /\_/\__/
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