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Re: SVG: information about original datapoints

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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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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

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