As to the issue of n-dim doubles, it would be interesting to consider creating a set of classes of type Orderable (supporting <, <=, >, >= operations), this we can use in both Rtree and Btree. Right now Btree only supports datatype Long. This should also become more generic. A first step we can take is at least wrap the common datatypes in Orderable classes. Niels
> Date: Wed, 29 Jun 2011 00:32:15 +0200 > From: cr...@amanzi.com > To: user@lists.neo4j.org > Subject: Re: [Neo4j] neo4j-graph-collections > > The RTree in principle should be generalizable, but the current > implementation in neo4j-spatial does make a few assumptions specific to > spatial data, and makes use of spatial envelopes for the tree node bounding > boxes. It is also specific to 2D. We could make a few improvements first, > like generalizing to n-dimensions, replacing the recursive search with a > traverser and generalizing the bounding boxes to be simple double-arrays. > Then the only thing left would be to decide if it is ok for it to be based > on n-dim doubles or should be generalized to more types. > > On Tue, Jun 28, 2011 at 11:14 PM, Saikat Kanjilal <sxk1...@hotmail.com>wrote: > > > I would be interested in helping out with this, let me know next steps. > > > > Sent from my iPhone > > > > On Jun 28, 2011, at 8:49 AM, Niels Hoogeveen <pd_aficion...@hotmail.com> > > wrote: > > > > > > > > A couple of weeks ago Peter Neubauer set up a repository for in-graph > > datastructures: https://github.com/peterneubauer/graph-collections. > > > At this time of writing only the Btree/Timeline index is part of this > > "component". > > > In my opinion it would be interesting to move the Rtree parts of > > neo-spatial to neo4j-graph-collections too. > > > I looked at the code but don't feel competent to seperate out those > > classes that support generic Rtrees from those classes that are clearly > > spatial related. > > > Is there any enthusiasm for such a project and if so, who is willing and > > able to do this? > > > Niels > > > > > > > > > > > > _______________________________________________ > > > Neo4j mailing list > > > User@lists.neo4j.org > > > https://lists.neo4j.org/mailman/listinfo/user > > > > > _______________________________________________ > > Neo4j mailing list > > User@lists.neo4j.org > > https://lists.neo4j.org/mailman/listinfo/user > > > _______________________________________________ > Neo4j mailing list > User@lists.neo4j.org > https://lists.neo4j.org/mailman/listinfo/user _______________________________________________ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
