Re: [graphviz-interest] SVG: Export edges as connectors

Hi John,

I'm confused by this - does SVG have built-in arrowheads? I thought you always had to manually define the "markers".

I am sure the parameters are quite different from those that graphviz uses, so it would still be a lot of work to translate the arrow definitions, and they still might not render the same.

Cheers,
Gordon
(busily porting a lot of graphviz-like shapes and attributes to the D3/JS/SVG world...)


> On Nov 2, 2015, at 9:49 AM, John Ellson <[email protected]> wrote:
> 
> Matt,
> 
> I don't have a problem with what you are trying to do,  but my problem is that
> graphviz has a philosophy of trying to render graphs identically in all formats,  and SVG's set of arrows
> are not aiigned with graphviz's.
> 
> We had a similar issue with colors, which was eventually resolved by introducing sets of color names,  so that "SVG color names could be used instead of "X11" names.
> 
> So probably the right thing to do here is to introduce some alternate "arrowhead" set support,  so that you you could specify
> "svg" arrows (and explicitly give up the assurance that it will look the same in other formats).
> 
> My other problem is that I really don't have the time to work on this...   Perhaps this could be a useful project if someone wanted to contribute some code?
> 
> John
> 
> On 11/02/2015 09:35 AM, Matt wrote:
>> Hi,
>> 
>> [Please keep me in CC]
>> [Question at the end and in the title, introduction to the problem first]
>> 
>> I have a 20 nodes state machine (fsm) generated with graphviz because
>> it was ideal to iterate over the fsm. I now want to generate a proper
>> image of this with a well thought layout. My idea was to export to svg
>> and then move the nodes as I want them to be.
>> The problem is that when I move the nodes, the edges don't follow the nodes.
>> 
>> I found out that to have edges follow the nodes, I had to use
>> *connectors* instead of *path* elements and I also a found a script
>> that just does that :
>> http://john-raffensperger.blogspot.fr/2015/05/drag-your-graphviz-nodes-with-inkscape.html
>> Kudos to the author !
>> (the script creates straight connectors while it seems possible to
>> have *splined* connectors as shown in:
>> http://tavmjong.free.fr/SVG/CONNECTORS/index.xhtml but that's not that
>> much of a problem for me).
>> 
>> The annoying problem is that the script loses the arrows that showed
>> the transition direction.  I wondered if:
>> 1/ SVG supports directional connectors
>> 2/ if 1/, would it be possible to do it in graphviz ?
>> 
>> Best regards
>> Matt
>> 
>> PS: I hope this is the good mailing list: I could not find the address
>> of the mailing list on page http://www.graphviz.org/MailingList.php
>> which is weird, otherwise sorry and please tell me the correct mailing
>> list.
>> _______________________________________________
>> [email protected]
>> http://lists.research.att.com/mailman/listinfo/graphviz-interest
> 
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