Announcements, discussion openers, technical questions about the functional programming language Haskell

Ivan Lazar Miljenovic | 19 Apr 2012 16:10

Re: ANNOUNCE: graphviz-2999.13.0.0

I should have pointed out that for most people, there should be
minimal to no API change with this release; the only change I needed
to make in my own code was that a type-class I had defined in
Graphalyze was removed as it provided the impetus for the ToGraphID
class mentioned below.

On 19 April 2012 22:52, Ivan Lazar Miljenovic <ivan.miljenovic <at> gmail.com> wrote:
> I'm hoping the second part of the version number isn't ominous, but
> I've just uploaded the latest release in my bindings for the Graphviz
> suite of graph visualisation tools.
>
> The changes in this release are:
>
> * Added support for the `osage` and `patchwork` visualisation tools,
>  available as of Graphviz-2.28.0.
>
> * Updated attributes as of Graphviz-2.28.0:
>
>    - `SVG` colors are now supported, and the support for different
>      colors has been revamped.
>
>    - `overlap=false` is now equivalent to `overlap=prism` and the
>      `RemoveOverlaps` option has been removed.
>
>    - `LabelScheme` and `Rotation` are new attributes for use with
>      `sfdp`.
>
>    - `Scale` is a new attribute for use with `twopi`.
>
>    - Add new italics, bold, underline, superscript and subscript

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Ras Far | 19 Apr 2012 19:21

Re: ANNOUNCE: graphviz-2999.13.0.0

Hello Ivan,

Thanks for bringing Graphviz to Haskell, and for your continuing
dedication to making it more complete!

I just tried Graphvis for the first time a few days ago.  I regretted
the absence of example code, especially as the API has been evolving,
so that examples on the Web do not generally work without change.

I see that the inclusion of QuickStart-style documentation is on your
short-term list of milestones.  I suppose an example program is not
quite that, but it might help.  Do you have something along these
lines?  Or, if not, if I managed to put something together which
exercises a good cross-section of the features, do you think you could
include it with the next release?  I suppose there's a trade-off
between ease of maintaining the code through releases, and feature
coverage of the example(s)...

I'm CC-ing haskell-cafe in case anyone reading already has some
example code like this, which they'd be willing to donate?  If
possible, it ought to be small yet illustrate a lot of features.

Kind Regards,
Andrew

On Thu, Apr 19, 2012 at 10:10 AM, Ivan Lazar Miljenovic
<ivan.miljenovic <at> gmail.com> wrote:
> I should have pointed out that for most people, there should be
> minimal to no API change with this release; the only change I needed
> to make in my own code was that a type-class I had defined in

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Ivan Lazar Miljenovic | 20 Apr 2012 00:04

Re: ANNOUNCE: graphviz-2999.13.0.0

On 20 April 2012 03:21, Ras Far <rasfar <at> gmail.com> wrote:
> Hello Ivan,
>
> Thanks for bringing Graphviz to Haskell, and for your continuing
> dedication to making it more complete!
>
> I just tried Graphvis for the first time a few days ago.  I regretted
> the absence of example code, especially as the API has been evolving,
> so that examples on the Web do not generally work without change.
>
> I see that the inclusion of QuickStart-style documentation is on your
> short-term list of milestones.  I suppose an example program is not
> quite that, but it might help.  Do you have something along these
> lines?  Or, if not, if I managed to put something together which
> exercises a good cross-section of the features, do you think you could
> include it with the next release?  I suppose there's a trade-off
> between ease of maintaining the code through releases, and feature
> coverage of the example(s)...

Well, one reason I haven't included anything like that is because I'm
not sure what to write, or where to put it!

If you're using FGL graphs, you probably want [graphToDot]; otherwise,
[graphElemsToDot] might do what you want (for which I've written an
[example], which is also linked to from the [FAQ]).

[graphToDot]: http://hackage.haskell.org/packages/archive/graphviz/2999.13.0.1/doc/html/Data-GraphViz.html#v:graphToDot
[graphElemsToDot]:
http://hackage.haskell.org/packages/archive/graphviz/2999.13.0.1/doc/html/Data-GraphViz.html#v:graphElemsToDot
[tutorial](http://ivanmiljenovic.wordpress.com/2011/10/16/graphviz-in-vacuum/)

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Andrew Seniuk | 20 Apr 2012 03:20

Re: ANNOUNCE: graphviz-2999.13.0.0

Alright, thank-you Ivan.  I'm not yet using any standard library for
my graphs, although no doubt I should, and FGL sounds like the obvious
choice.  Just hoping for a "tour de force" example of the layout and
visualisation possibilities, preferably some Haskell code in the
public domain that was guaranteed to work with the current version of
the graphviz library, and could be used by newcomers as a springboard.
 Probably I'm being lazy, and should just start from scratch from the
API.  Thanks again for your efforts!  -Andrew

On Thu, Apr 19, 2012 at 6:04 PM, Ivan Lazar Miljenovic
<ivan.miljenovic <at> gmail.com> wrote:
> On 20 April 2012 03:21, Ras Far <rasfar <at> gmail.com> wrote:
>> Hello Ivan,
>>
>> Thanks for bringing Graphviz to Haskell, and for your continuing
>> dedication to making it more complete!
>>
>> I just tried Graphvis for the first time a few days ago.  I regretted
>> the absence of example code, especially as the API has been evolving,
>> so that examples on the Web do not generally work without change.
>>
>> I see that the inclusion of QuickStart-style documentation is on your
>> short-term list of milestones.  I suppose an example program is not
>> quite that, but it might help.  Do you have something along these
>> lines?  Or, if not, if I managed to put something together which
>> exercises a good cross-section of the features, do you think you could
>> include it with the next release?  I suppose there's a trade-off
>> between ease of maintaining the code through releases, and feature
>> coverage of the example(s)...
>

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