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 | moc...@fis.unam.mx /\_/\__/ GPG: 791EB9EB, C949 3F81 6D9B 1191 9A16 C2DF 5F0A C52B 791E B9EB
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