Sheldon,
> What ever is done to improve plotting, I hope some of the
> functionality of gnuplot is not removed. For instance, the ability to
> export to xfig, png, and many other formats. Also, since gnuplot gets
> better and better, it would be nice to have access to all of the
> features of gnuplot from maxima.
gpdraw acts as a filter and some (many) gnuplot features are lost. We
could define a new option (let's call it 'user_preamble') where
gnuplot-experts could write additional settings to be sent to gnuplot,
just before the 'plot' or 'splot' command.
> For instance, using gnuplot interactively, one can save the
> coordinates of mouse-clicked points on the screen (in a 2d plot) to a file. As far
> as I can tell, one can't do that in maxima at this time.
Now you can with gpdraw. I've uploaded a new version (I call it version
3):
http://www.telefonica.net/web2/biomates/maxima/gpdraw
If you write
gpdraw2d(xy_file="my_coord_file",explicit(u^2,u,-3,3))$
you can clic on any point with the mouse button, afterwards if you hit
the 'x' key, the coordinates will be sent to "my_coord_file", as many
times as you clic+hit x.
Hope this helps.
Mario.
--
Mario Rodriguez Riotorto
www.biomates.net