gnuplot-beta

Enhancement Request: output pipe for interogation commands

[nabed <ss...@ol...>]

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)

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

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.

Thanks,
Serle
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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

Re: Enhancement Request: output pipe for interogation commands

[nabed <ss...@ol...>]

Thanks Ethan,

The final part of the question is to provide the ability for the user to
graphically add new points onto a given graph by clicking on a location on
the graph. e.g say I have a smooth function and want to add a bump to it in
a region, I could replace three existing points by adding three new points
(via mouse interaction on the graph window) and then form a new smooth
interpolated graph containing the new points. I would then want to get the
new dataset back from gnuplot.


Serle



Ethan Merritt wrote:
> 
> 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
> 
> ------------------------------------------------------------------------------
> _______________________________________________
> gnuplot-beta mailing list
> gnu...@li...
> https://lists.sourceforge.net/lists/listinfo/gnuplot-beta
> 
> 

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Re: Enhancement Request: output pipe for interogation commands

[Ben A. <bpa...@ma...>]

nabed wrote:
> 
> Thanks Ethan,
> 
> The final part of the question is to provide the ability for the user to
> graphically add new points onto a given graph by clicking on a location on
> the graph. e.g say I have a smooth function and want to add a bump to it
> in a region, I could replace three existing points by adding three new
> points (via mouse interaction on the graph window) and then form a new
> smooth interpolated graph containing the new points. I would then want to
> get the new dataset back from gnuplot.
> 
> Serle
> 

As Petr mentioned Octave is able to communicate with gnuplot and obtain
information with regards the mouse. You might find it useful to look over
that solution.

http://hg.savannah.gnu.org/hgweb/octave/file/8651fcc89556/scripts/plot/__gnuplot_ginput__.m

The pipe/plot-stream is opened in the routine below

http://hg.savannah.gnu.org/hgweb/octave/file/8651fcc89556/scripts/plot/gnuplot_drawnow.m

Ben

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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.

---
PM