Re: issues with facealpha and different image formats

[Michael Goffioul]

On Sun, Mar 16, 2014 at 4:34 AM, Francesco De Vita <address@hidden> wrote:

Hello
I'm using Octave 3.8.1 on Debian Testing/Sid.
I'm writing here mainly because of an issue I have with the property
"facealpha". Let's get to an example code:

> graphics_toolkit ("gnuplot")
> # because with fltk octave segfaults
> f1=figure(1);
> hold on;
> grid on;
> axis([0 3 0 3]);
> h=fill([1,2,2,1],[1,1,2,2],'b');
> set(h,'facealpha',0.4);

I'm expeting to see in the plot window a blue transparent square with a
visible grid beneath it, but I only see an opaque pale blue square. This
is not expected.

Transparency is not supported yet in the on-screen OpenGL renderer.

Michael.