new GPVAL_ variables

[Petr Mikulik]

I've just updated

Subject: [ gnuplot-Feature Requests-1939687 ] GPVAL_PLOT, _VIEW_X
https://sourceforge.net/tracker/?func=detail&atid=352055&aid=1939687&group_id=2055

which adds new GPVAL_ automatic variables:

GPVAL_PLOT={0|1}
GPVAL_SPLOT={0|1}
GPVAL_VIEW_MAP={0|1}
GPVAL_VIEW_ROT_X=double
GPVAL_VIEW_ROT_Z=double
GPVAL_VIEW_SCALE=double
GPVAL_VIEW_SCALE_Z=double
GPVAL_MULTIPLOT={0|1}

Does somebody find use for (need) other variables?

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[Ethan Merritt]

On Wednesday 02 July 2008 14:51:44 Petr Mikulik wrote:

> I've just updated
>
> Subject: [ gnuplot-Feature Requests-1939687 ] GPVAL_PLOT, _VIEW_X
> https://sourceforge.net/tracker/?func=detail&atid=352055&aid=1939687&group_id=2055
>
> which adds new GPVAL_ automatic variables:
>
> GPVAL_VIEW_ROT_X=double
> GPVAL_VIEW_ROT_Z=double
> GPVAL_VIEW_SCALE=double
> GPVAL_VIEW_SCALE_Z=double

These make sense to me.

> GPVAL_MULTIPLOT={0|1}
> GPVAL_VIEW_MAP={0|1}

Maybe.  But if multiplot mode is involved then all the other settings
are probably valid only for the final plot in the set.

> GPVAL_PLOT={0|1}
> GPVAL_SPLOT={0|1}

But I do not understand how one could use these.  They are only
true inside a plot, and inside the plot how can you query them?

As an alternative suggestion, how about providing a string
variable
  GPVAL_LAST_PLOT
that points to the same string reported by "show plot"?
One could inspect that string to see if the previous command
was 'plot' or 'splot'.  Better yet....

> Does somebody find use for (need) other variables?

There was a question on the newsgroup, I think, about querying the
information from a "show" command from a script.  For instance,
I think there is no way for a script to check the name of the current
output file.  Could we have another string variable GP_VAL_SHOW
that always contains the result of the last "show" command?

--
Ethan A Merritt

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[Petr Mikulik]

> > GPVAL_MULTIPLOT={0|1}
>
> Maybe.  But if multiplot mode is involved then all the other settings
> are probably valid only for the final plot in the set.

I intended it mainly for the case when a script fails inside set multiplot.

> > GPVAL_PLOT={0|1}
> > GPVAL_SPLOT={0|1}
>
> But I do not understand how one could use these.  They are only
> true inside a plot, and inside the plot how can you query them?

For binding hotkeys. Left and right arrows could have different bindings in
plot and splot, e.g.
bind 'Left' if (GPVAL_PLOT) shift xrange left; replot; \
        else builtin_rotate_left

> As an alternative suggestion, how about providing a string
> variable
>   GPVAL_LAST_PLOT
> that points to the same string reported by "show plot"?
> One could inspect that string to see if the previous command
> was 'plot' or 'splot'.

Good idea, I'm adding it. Having GPVAL_{S}PLOT is necessary anyway, since
the plot command can start with "p ", "plo ", "sp ", ...

> > Does somebody find use for (need) other variables?
>
> There was a question on the newsgroup, I think, about querying the
> information from a "show" command from a script.  For instance,
> I think there is no way for a script to check the name of the current
> output file.  Could we have another string variable GP_VAL_SHOW
> that always contains the result of the last "show" command?

This would be nice. I guess it would need printing the "show output" into a
text buffer.

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[Petr Mikulik]

> > As an alternative suggestion, how about providing a string
> > variable
> >   GPVAL_LAST_PLOT
> > that points to the same string reported by "show plot"?
> > One could inspect that string to see if the previous command
> > was 'plot' or 'splot'.

I've added to SF also a patch for GPVAL_TERMINALS, which contains names of
all terminals compiled-in. I guess it might be useful as well.

Example:
gnuplot> print GPVAL_TERMINALS
 cgm corel dpu414 dumb dxf eepic emf emtex epslatex epson_180dpi epson_60dpi
epson_lx800 fig gif gpic hp2623A hp2648 hp500c hpdj hpgl hpljii hppj imagen
jpeg latex mf mif mp nec_cp6 okidata pbm pcl5 pdfcairo png pngcairo
postscript pslatex pstex pstricks qms regis starc svg tandy_60dpi tek40xx
tek410x texdraw tgif tkcanvas tpic unknown vttek wxt x11 xlib

gnuplot> print strstrt(GPVAL_TERMINALS, " png ")
208

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