[Octave-bug-tracker] [bug #53888] figure handle is not cleared in gnuplot

[Dan Sebald]

Follow-up Comment #1, bug #53888 (project octave):

gnuplot toolkit has deficiencies in that regard.  It's an externally program,
so there is no easy way of knowing what the user is doing.  For example, do
the following:


>> close all
>> graphics_toolkit gnuplot
>> sombrero
>> [azimuth, elevation] = view ()
azimuth = -37.500
elevation =  30
>> # manually rotate the plot
>> [azimuth, elevation] = view ()
azimuth = -37.500
elevation =  30


Note how the angle does not change because the info can't be gotten from
gnuplot, at least not in an easy way.  gnuplot has a terminal model, meaning
that all of its drivers are like data sinks.  The program can switch freely
between terminals, Qt, x11,  latex, etc. but none of them are interactive (the
mousing is a bit of trick in most of the on-screen terminals).

I doubt anyone will attempt to fix this.  gnuplot toolkit is mainly an
alternative that offers more flexible print display types, i.e., output
formats.  It shouldn't be used for GUIs.

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