Some observations of issues with FLTK backend

[Michael Goffioul]

On Mon, Jun 30, 2008 at 3:49 PM, David Bateman
<David.Bateman at motorola.com> wrote:
> To check the performance of the FLTK plotting I tried to run all of the
> demos in scripts/plot. I noticed a few issues.
>
> * There was no text anywhere (title, axis, etc). I suppose this is
> related to the fonts issue Shai mentioned so I'll wait on this one

Yes, Shai is working on it.

> * images aren't rendered

This is not implemented yet. To do it, I need also to implement
a cache system and I still couldn't figure out the best way to
do it.

> * "demo colorbar" seg-faults Octave

I found the reason for this and come with a patch
later.

> * patches with facecolor of none don't render in color but rather BW and
> so contour3 and contour don't work

The patch object still misses some behavioral code
(to compute normals, to compute XYZ from Face/Vertex
and vice versa...). Some time ago, Kai sent me a changeset
with initial implementation. I sent some comments back,
but didn't any reaction so far. Maybe I should commit the
changeset as-is...

> * plotyy seems broken and so pareto doesn't work either

I didn't look very deeply, but it looks like plotyy fails
when a plot already exists. If no figure is present,
plotyy succeeds for me. If you have some time, maybe
you could look at it.

Michael.