From: jbw <jbw@...>
Date: 2010-03-14T03:33:36+09:00
Subject: Re: Newbie Help : Object

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I imagine an event library like ruby-event would suit this, but it might not
:p

On Sat, Mar 13, 2010 at 5:26 PM, Gary Wright <gwtmp01@mac.com> wrote:

>
> On Mar 13, 2010, at 8:15 AM, Jerome David Sallinger wrote:
> > This question may be more to do with my understanding of OOP that the
> > actual contructs of Ruby so please be patient with me.
>
> Actually I think your question isn't really about OOP or Ruby at
> all but instead is just an algorithm question related to
> computer graphics or even a more general question about
> combinations of things.
>
> To bring this back to Ruby. If you have a collection of
> objects and you want to consider all possible combinations
> of two objects:
>
> irb> collection =  [1,2,3,4]
> => [1, 2, 3, 4]
> irb> collection.combination(2).to_a
> => [[1, 2], [1, 3], [1, 4], [2, 3], [2, 4], [3, 4]]
> irb> collection.combination(2).select { |a,b| (a-b).abs == 1 }
> => [[1, 2], [2, 3], [3, 4]]
>
> I just showed selecting pairs based on a simple mathematical
> criteria but the collection could have been your balls, and
> the selection could have utilized your #intersect? method.
>
> Note, you have to be using Ruby 1.8.7 or 1.9.X to have
> the combination method.
>
> Gary
>
>


-- 
jbw

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