[postgis-devel] smoothing function Chaikins algorithm

[Darafei "Komяpa" Praliaskouski]

Please note that surnsme is Чайкин (Chaikin) and does not have "s" in it.

On пт, 9 сак 2018, 15.25 Regina Obe <lr at pcorp.us> wrote:

> Sure.  Something I've always wanted.
>
> As far as the name goes,  it would be nice to keep Chaikins in the name,
> but if you want the name to be searchable by purpose
>
> Perhaps something like  ST_ChaikinsSmooth
>
> Thanks,
> Regina
>
>
> -----Original Message-----
> From: postgis-devel [mailto:postgis-devel-bounces at lists.osgeo.org] On
> Behalf Of Nicklas Avén
> Sent: Friday, March 09, 2018 5:03 AM
> To: postgis-devel at lists.osgeo.org
> Subject: [postgis-devel] smoothing function Chaikins algorithm
>
> Hello
>
> I have implemented chiakins algorithm for smoothing geometries.
>
> http://idav.ucdavis.edu/education/CAGDNotes/Chaikins-Algorithm/Chaikins
> -Algorithm.html
> <http://idav.ucdavis.edu/education/CAGDNotes/Chaikins-Algorithm/Chaikins-Algorithm.html>
>
> The algorithm is amazing simple
>
> Signature is:
>
> st_chaikins(geom geometry, n_iterations int, preserve_endpoints
> boolean)
>
> Do we want it in PostGIS?
>
> Should it be a more describing name than st_chaikins?
>
> The function more or less doubles the number of vertex points per
> iteration, so I have to put in a max number of iterations. I tried it with
> 40 iterations without thinking about it and it of course crashed the server
> :-)
>
> It can be combined with some simplify function to again reduce number of
> verteces.
>
> The use case here is geometries generated from raster to smooth out the
> pixels.
>
> I have some cleanup to do before putting it somewhere.
>
> Thanks
>
> Nicklas
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