Hi Julius,
> My daughter is using VisAD for a high school science project. She asked me if
> there is a widget that would allow her to change the scale of a plot, or
> preferably, change each axis individually on a plot from linear to log and
> vice versa. I do not think that there is such a widget, but I am not sure. (I
> have not used VisAD since 98). I would appreciate if somebody could help me.
>
> If there is no such a widget, I also would appreciate if somebody could
> suggest an easy way for her to write one?
See:
http://www.unidata.ucar.edu/glimpse/visad-list/1983
which includes a sample program for doing this. It isn't just
a simple widget, but it does get the job done using a custom
LogCoordinateSystem and explcitly setting axis labels.
Good luck,
Bill
