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SVG: information about original datapoints

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  SVG: information about original datapoints fabrice.leal.ch@gmail.com - 2013-07-16 01:06 -0700
    Re: SVG: information about original datapoints sfeam <sfeam@users.sourceforge.net> - 2013-07-16 09:37 -0700

#1938 — SVG: information about original datapoints

Is it possible to include some sort of datapoint information in the SVG terminal (or perhaps the js one ...), so that one can make interactive charts (as in, the user clicks a bar in a histogram, and I'm able to catch that event and pull more information from the server)?

Is gnuplot even remotely prepared for such a future feature? I wouldn't mind triying to get that to work myself ... 

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#1939

fabrice.leal.ch@gmail.com wrote:

> Is it possible to include some sort of datapoint information in the
> SVG terminal (or perhaps the js one ...), so that one can make
> interactive charts (as in, the user clicks a bar in a histogram, and
> I'm able to catch that event and pull more information from the
> server)?

Not in the current version.

> Is gnuplot even remotely prepared for such a future feature?

Version 4.7 supports mouse-activated hypertext.  When the mouse 
hovers over an anchor point, the text pops up in a little box.
See:
	http://gnuplot.sourceforge.net/demo_svg_4.7/hypertext.html

It would be an obvious extension to perform some action using
the stored text as a parameter, e.g. treating it as a URL and
trying to open a browser window.  

> I wouldn't mind triying to get that to work myself ...

It would be nice to see some discussion about how such a capability
would be presented to the user.  I had a proof-of-principle patch
to implement a similar feature quite a few years ago, but that was
before the current hypertext infrastructure was added.  I don't think
that code is the best place to start in modifying the current gnuplot
but it might provide some ideas.
	https://sourceforge.net/p/gnuplot/patches/400/
Old demo:
	http://skuld.bmsc.washington.edu/~merritt/gnuplot/index.html#svg+xlink

Apart from the user interface, which as I say is open to discussion,
I can tell you that implementing this for the HTML5 canvas terminal
is trivial and for svg is not much harder.  But I have no idea how to
do it for the other "modern" terminals however (wxt, qt, win).

	Ethan

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