brainstorming SVG_INTERACTIVE

[<pl...@pi...>]

Hi Ethan,

I have the basic mechanics in place to add some interactivity to
svg.trm, so  I need to look at how to integrate this into the rest of
gnuplot.

One of the main needs is to sprinkle a few id=xxx markers into the
various path and group elements so they can be identified and
modified via js and the DOM.

If I want to add another arguement to the functions made visisble in
TERM_TABLE that would seem to mean changing every call and also the
terminals that dont support the new features. While feasible, it seems a
bit radical.

It is generally a good idea to have at least one 'joker' arguement as a
structure pointer in such interdependant interfaces. This allows for
future expansion without altering the prototypes and reorganising the
whole code structure.



This is certainly a result of a long running project that has evolved
well beyond it's original objectives. At some stage it may be worth
adding such extra args.


I had a look at the href patch which seems to work by adding a href
variable to some structures and an SVG_href() function to output the
xlink code. This works quite well for the labels and the command syntax
is clear but it looks less robust for more general entities like plots ,
where trying to wrap it needs several flags to keep track of things.