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Pop-up Display Questions - Mar. 16, 2012

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  Pop-up Display Questions - Mar. 16, 2012 "E.D.G." <edgrsprj@ix.netcom.com> - 2012-03-16 11:19 -0500
    Re: Pop-up Display Questions - Mar. 16, 2012 sfeam <sfeam@users.sourceforge.net> - 2012-03-16 18:54 -0700
      CGI Question - Mar. 22, 2012 "E.D.G." <edgrsprj@ix.netcom.com> - 2012-03-22 03:13 -0500

#979 — Pop-up Display Questions - Mar. 16, 2012

POP-UP DISPLAY QUESTION
Posted by E.D.G. on March 16, 2012

       Several of us are using an older version of Gnuplot (4.2) to work 
with other language computer programs in order to create drawings.  That 
older version is presently being used because the download package only 
needs to contain 2 Gnuplot files.

       I went through the documentation for 4.2 but could not find an answer 
for the following questions.

Question:  Is there a way to get that version to display a pop-up window 
with additional information when the computer mouse is moved to some 
location on the screen?

       We are displaying things such as volcanos on a computer screen map. 
And when the computer mouse is pointing to one of the volcanos on the screen 
we would like to have a pop-up window display additional information such as 
the volcano's latitude and longitude etc.

Question:  If that is not possible with 4.2, is it possible with other 
versions of Gnuplot, and if so, which ones?

Question:  If no version of Gnuplot can do that, can a pipe be opened 
between Gnuplot and say a Perl program running in the background that would 
let Gnuplot send the Perl program the computer mouse X and Y location 
values?

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#980

E.D.G. wrote:
 
> Question:  Is there a way to get that version to display a pop-up
> window with additional information when the computer mouse is moved to
> some location on the screen?

SVG output in the current gnuplot does that.  If the mouse hovers over
part of the plot, the viewer pops up a tool-tip type window with the 
name of the plot in it.  The name is by default rather boring 
(e.g. "gnuplot_plot_4") but you could write a script to replace that 
with something more informative.

> We are displaying things such as volcanos on a computer screen map.
> And when the computer mouse is pointing to one of the volcanos on the
> screen we would like to have a pop-up window display additional
> information such as the volcano's latitude and longitude etc.

All the terminal types should now put out enough information to do this
in an external viewer.  For example, if you make PNG plots for use on a
web page you can also write out the origin + axis scaling information so
that you can associate a mouse-sensitive image map that overlays the PNG
image.

If you are talking about what you can do while you are still in gnuplot,
that's a different question.  The closest to what you ask, I think, is
the ability of the current generation of interactive terminals (wxt, qt,
windows) to toggle plot elements on/off in response to mouse clicks. 
You could add to your existing plot an overlay of informative labels,
then toggle that overlay on/off with the mouse. 

> Question:  If that is not possible with 4.2, is it possible with other
> versions of Gnuplot, and if so, which ones?

Not possible in 4.2.
Current version is 4.6, just released.

	happy plotting,

		Ethan


> Question:  If no version of Gnuplot can do that, can a pipe be opened
> between Gnuplot and say a Perl program running in the background that
> would let Gnuplot send the Perl program the computer mouse X and Y
> location values?

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#995 — CGI Question - Mar. 22, 2012

"sfeam" <sfeam@users.sourceforge.net> wrote in message 
news:jk0qrr$1pr$1@dont-email.me...

Posted by E.D.G. on March 22, 2012

Thanks for the information.

       This is a multiple persons project and it can take some time to make 
one complete loop of all of the project sections and get back to addressing 
Newsgroup posts such as this one.

Questions:

       It sounds from some of the documentation like gnuplot might be used 
as a CGI program at a Web site so that png files can be created and stored 
at the site.  Is that correct?

       If so then where can information be found regarding how to get 
gnuplot organized for doing that?

       The project several of us are presently working on involves preparing 
computer programs that are scheduled to eventually be translated into CGI 
programs for use at a Web site.  Since gnuplot is being used with the 
present computer programs to generate charts, if it can also be used at a 
Web site then we might try getting a Web page created for doing that so that 
we can get a startup version of the actual Web page running with all of the 
needed data input screens etc.

       For the PC versions of the Web site CGI programs we will probably use 
Xampp with our programs and gnuplot.

       If gnuplot cannot be used for CGI work then we will eventually need 
to use some other program to generate our png files at the Web site.  That 
is not expected to be a problem.  But it will take some additional research.

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