Re: [graphviz-interest] Dendrograms/Cladograms

Hi Hermann

On 26/12/15 07:48, [email protected] wrote:
> Hi Ron,
>
>> This is because there's no easy way of walking the tree and
>> determining how wide it will spread.
>>
> please provide a sample input file you consider difficult.

I was thinking of a tree which branches outwards, but at some point one 
of the outer nodes starts a trend of repeated branching back towards the 
center. I assume this would make it difficult to determine the height 
(plotted left-to-right) of the cladogram. I do admit this is speculation.

> I am not sure what the input looks like, but if it is just a tree, then
> simple traversal(s) will allow to determine all the information
> necessary and produce the .pic file needed for the cladogram.

Perhaps, but I'm uneasy about outputting .pic, since I don't know it and 
I don't know my target audience. Since I've already indicated I have 
great respect for dot, you might think that's inconsistent, but pic is 
not shipped with dot. What I'm trying to say is I'm juggling various goals:

o Write all code in Perl. This is my strong preference.

o Avoid calling any external software if possible. This is to simplify 
end-user usage.

As it is, I've already had a formal request to automatically install dot 
when someone installs one of my dot-using modules. But this is a can of 
worms, even though now, in Perl, we have Alien::Base + it's plugins 
which attempts to support such installs.

o If calling external software, stick to formats I'm familiar with. So, 
DOT language in preference to .pic.

> I played a bit more with "pic", made "pic" produce a Christmas tree
> today ;-)
> https://twitter.com/HermannSW/status/680343940692836352

Neato, very neato.

-- 
Ron Savage - savage.net.au
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