Re: Enhancement Request: output pipe for interogation commands

[Petr M. <mi...@ph...>]

> 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. 

This is possible and e.g. Octave is using this mechanism.
For more information, see
http://gnuplot.sourceforge.net/links.html
=> Programming interfaces – bidirectional interaction

> 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)

I would recommend to let the user do the zooming and press Enter 
when he is finished ... because then you can use
	pause mouse key
until MOUSE_CHAR is Enter (or Escape) character.

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

> 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.

That's not task of gnuplot but of the driving application. You can do
	pause mouse key
and then read MOUSE_CHAR, MOUSE_X, MOUSE_Y (see "show var all"), remove/add 
the point, and replot.

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PM