Hello Years ago, I asked about using alpha channels in plot. Bill Lam showed one way of possibility.
I have used a different tool(R's ggplot) then. Now I am looking into J's plot again. Is there any simple way to add transparency in plot? I have explored the source code for a while but it was just too complicated. Maybe, something like the following would be ideal, pd 'color 255 0 0 100' NB. RGBA pd i.10 pd 'show' Any ideas? On Sun, May 13, 2012 at 1:39 PM, bill lam <[email protected]> wrote: > As a very crude way to demostrate alpha channel in jgtk, open the > file ~addons/graphics/gl2/gl2.ijs , find the verb irgba2cairo > > irgba2cairo=: 3 : 0 > 'r g b a'=. 255%~ 4{.y,0 > a=. 1-a > (r,g,b), a > ) > change the the 'a=. 1-a' to > > a=. 0.5 [ 1-a > > then open the config base.cfg, change the noun GL2ExtGlcmd to 0. > restart J and try some gkt plot. > > Вск, 13 Май 2012, bill lam писал(а): > > plot depends gl2 and gl2 does not yet support alpha channel. The main > > difficulty is to decide alpha to mean opacity or translucence. One > > of them is incompatible with the old gl2 while the other is incompatible > > with cairo, iirc. > > > > Вск, 13 Май 2012, June Kim (김창준) писал(а): > > > Hello > > > > > > Is there any way to use the alpha channel in plot(in J7 or J602)? > > > http://en.wikipedia.org/wiki/RGBA_color_space > > > > > > The thing is I will draw a lot of overlapped line plots and if the > lines > > > are a bit transparent it would look much easier to see the patterns. > > > ---------------------------------------------------------------------- > > > For information about J forums see http://www.jsoftware.com/forums.htm > > > > -- > > regards, > > ==================================================== > > GPG key 1024D/4434BAB3 2008-08-24 > > gpg --keyserver subkeys.pgp.net --recv-keys 4434BAB3 > > -- > regards, > ==================================================== > GPG key 1024D/4434BAB3 2008-08-24 > gpg --keyserver subkeys.pgp.net --recv-keys 4434BAB3 > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
