Re: GPGET('terminal')

[Ethan M. <merritt@u.washington.edu>]

On Sunday 14 May 2006 01:10 pm, Petr Mikulik wrote:
>
> I have implemented it as you've proposed, see SF patch
>  	1488448  User-available GPVAL_ variables
>
> Type
>      show var all
> to display those variables related to the last plot.

It looks basically reasonable to me.
There are some rough edges though:

%%%%%%% How to handle time data on axes? %%%%%%%%%%%%%%%%%%

Terminal type set to 'wxt'
gnuplot> load 'timedat.dem'
Hit return to continue
gnuplot> show xrange

  set xdata time
  set xrange [ "01/06/93\t0000" : "01/11/93\t0000" ] noreverse nowriteback

gnuplot> print GPVAL_X_MIN
-207792000.0
gnuplot> print GPVAL_X_MAX
-194572800.0

%%%%%%% Something wrong in save/load code %%%%%%%%%%%%%%%%%

Terminal type set to 'wxt'
gnuplot> save 'yyy'
gnuplot> load 'yyy'
Segmentation fault


I think these special variables should not be user-writable.
That is, I think we want to return an error message like

gnuplot>  GPVAL_TERM_OPTIONS = "something or other"
  Cannot set internal variable GPVAL_*

But this means it makes no sense to save these variables in
the `save` command, because it will not be possible to read
them back in on `load`.



-- 
Ethan A Merritt
Biomolecular Structure Center
University of Washington, Seattle WA