Hi JP, Right, there aren't enough possible operations on geometry collections to justify implementing the class.
Here's a bit of code that can get the bounds of any multipart geometry or Python sequence of geometries: >>> def bounds(geoms): ... groups = zip(*[list(o.bounds) for o in geoms]) ... return min(groups[0]), min(groups[1]), max(groups[2]), max(groups[3]) ... >>> from shapely.geometry import MultiPoint >>> r = MultiPoint([(0, 0), (4,4)]).buffer(1.0) >>> bounds(r) (-1.0, -1.0, 5.0, 5.0) It zips up the bounds of component geometries into 4 groups (minxs, minys, maxxs, maxys) and then finds the mins and maxs of these. It doesn't even need to switch on the types of things as long as every o in geoms is a Shapely geometry object. Does that look helpful? On Mon, Jan 20, 2014 at 3:54 PM, Juan Pablo Caram <jpca...@gmail.com> wrote: > Hello, > > Is there a way to combine several shapely geometry objects into a > collection without applying some operation like cascaded_union? I'm working > on a CAD/CAM program and I'm repeatedly running into the problem of having > to handle lists of geometry objects and collections differently. For > example, to find the bound I'm doing: > > if type(something) == list: > b = cascaded_union(something).bounds > elif type(something) == GeometryCollection: > b = something.bounds > etc... > > And I'm having to do something like this for almost every operation. > > I this previous post: > http://lists.gispython.org/pipermail/community/2012-November/003155.html > it's mentioned that a constructor for GeometryCollection was omitted on > purpose because there "isn't much point to the class", but it seems to be > making application development somewhat complicated (at least for me). What > would be the right approach to handling something like this? > > Thank you, > > JP > > _______________________________________________ > Community mailing list > Community@lists.gispython.org > http://lists.gispython.org/mailman/listinfo/community > > -- Sean Gillies
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