Geometry Boost List: Re: [geometry] problem with wkt io

Subject: Re: [geometry] problem with wkt io
From: Barend Gehrels (barend_at_[hidden])
Date: 2013-10-10 18:20:38

Hi Mateusz,

On 10-10-2013 0:28, Mateusz Loskot wrote:
> On 9 October 2013 20:00, lepere renaud <lepere.renaud_at_[hidden]> wrote:
>>   I am using read_wkt to read wkt polygons and wkt to convert them to string
>> but i have some problems. I though that wkt polygons should have the last
>> point equal to the first one ; however in my model polygons are not closed.
>> The function read_wkt and wkt do not handle the last point, is this normal
>> or did i missed something ?
> On reflection, I think it is a good idea to fix it indeed.
>
> I submitted patch with a fix proposal
>
> "Impose closed rings of polygon in WKT output"
>
> https://svn.boost.org/trac/boost/ticket/9217
>
> If the patch is acceptable, I will commit, so please confirm.
>

Yes, I agree it is a good idea to have the WKT always closed for 
polygons, and I agree with the patch.

One detail, it can also be done at compiletime (check if model is 
closed) with the same boolean flag, or even with a compile-time iterator 
(more complex), but the proposed solution is OK too and has the 
advantage that open polygons which are closed (somehow) are not closed 
again.

Regards, Barend