Re: Enhancement Request: output pipe for interogation commands

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

On Wednesday 25 March 2009 05:31:14 nabed wrote:
> 
> Hi
> 
> Would it be possible to add the ability recieve output from gnuplot, over
> stdout to enable command driven bi-directional communication with gnuplot.
> That way a program could start an embedded gnuplot process and monitor the
> processes input and outpout streams to do bi-directional communication. 
> 
> Specifically I would want to be able to use this text output pipe mechanism
> to:
> 
> 1)  get the region displayed by the graph, after the user has finished
> interactively zooming and panning. (get_xxx)

If you want output to stdout:
 print GPVAL_XMIN, GPVAL_XMAX, GPVAL_YMIN, GPVAL_YMAX

If you want output via a new or different pipe:
 set print "| namedpipe"
 print GPVAL_XMIN, GPVAL_XMAX, GPVAL_YMIN, GPVAL_YMAX

> 2) to be able to set when the user can interact with gnuplot or not i.e.
> toggle interaction mode.

I don't understand what you mean by this.

> 3) to be able to be able to put gnuplot in a mode which allows the user to
> toggle the addition and removal of new data points and to output point_added
> and point_removed notifications.

See the demo script:   "mousevariables.dem"


All of this is possible already; much of since version 4.2 or earlier.
If you could narrow your question down to a specific thing that you want
to do, perhaps someone will suggest a bit of sample code to look at.

> Thanks,
> Serle

-- 
Ethan A Merritt