Geometry Boost List: Re: [geometry] a ring concept implementation of a true circle?

Subject: Re: [geometry] a ring concept implementation of a true circle?
From: Barend Gehrels (barend_at_[hidden])
Date: 2012-08-28 16:49:28

On 28-8-2012 18:54, Mats Taraldsvik wrote:
> On 08/28/2012 03:47 PM, joe_at_[hidden] wrote:
>> Is there an easy way to model a true circle? By that I mean not a 
>> polygon with a bunch of closely spaced points, but something you 
>> construct with a point and a radius.
>>
>> I guess not? All rings must consist of a list of points?
>
> It is not part of the simple geometry feature set, which, as far as I 
> can see, is the only implemented data types thus far. However, the 
> SQL-MM standard has a CIRCULARSTRING type (see 
> http://postgis.org/docs/using_postgis_dbmanagement.html#SQL_MM_Part3). 
> It is currently missing(?) from Boost.Geometry (but might be in future 
> plans? Barend?)

Yes, plans are there: as Bruno answered (2 minutes before your mail ;-) 
) we started the nsphere geometry and concepts, but they are never 
released, so still in extensions. See Bruno's mail.

Regards, Barend