@Mathieu,
  There never was a full fledged solution. However there were several
suggestions posted on gis.stackexchange.com
Here are some questions that might be related (to the need) also.

http://gis.stackexchange.com/questions/5338/multi-colored-polygon-in-thematic-map/5350#5350

http://gis.stackexchange.com/questions/6446/symbolising-one-to-many-relationships/6459#6459

http://gis.stackexchange.com/questions/4771/how-can-i-obtain-the-following-effect-in-arcgis-or-any-free-software

http://gis.stackexchange.com/questions/8159/create-a-graphic/8183#8183

On Wed, May 25, 2011 at 10:40 AM, Mathieu Rajerison <
mathieu.rajerison@gmail.com> wrote:

> Hi,
>
>
> I need to perform this operation, but I don't see how to perform it.
>
> The method from centre seems right for me...
>
>
> Thanks!
>
> 2011/2/6 Brad Nesom <kidsmake6@msn.com>
>
> > Thanks Barry,
> >  I have been really impressed with the completeness of code found already
> > in R, I saw this question on gis.stackexchange and have had the occasion
> to
> > need/use it myself. Putting th etwo togethter made me ask it here. Thanks
> > for your reply. I will pursue I think the divide from center (since I
> just
> > finished dinner and it is time for desert).
> > Brad
> > On Sat, Feb 5, 2011 at 4:35 AM, Barry Rowlingson <
> > b.rowlingson@lancaster.ac.uk> wrote:
> >
> > > On Fri, Feb 4, 2011 at 9:32 PM, Brad Nesom <kidsmake6@msn.com> wrote:
> > > > is there a method to split polygons into equal parts? using a divisor
> n
> > > or
> > > > percentage?
> > >
> > >  Do you mean a mathematical method or some code in R?
> > >
> > >  There's clearly no unique solution to any case, and I can see cases
> > > where a solution would be hard to make while retaining simple
> > > polygons.
> > >
> > >  Convex polygons aren't so bad, and I can see various ways of chopping
> > > them up into equal parts. You could either slice them with parallel
> > > slices, like bread, or cut them from the centre, like pies. I'm
> > > feeling hungry now...
> > >
> > >
> > > --
> > > blog: http://geospaced.blogspot.com/
> > > web: http://www.maths.lancs.ac.uk/~rowlings
> > > web: http://www.rowlingson.com/
> > > twitter: http://twitter.com/geospacedman
> > > pics: http://www.flickr.com/photos/spacedman
> > >
> > > _______________________________________________
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> > > R-sig-Geo@r-project.org
> > > https://stat.ethz.ch/mailman/listinfo/r-sig-geo
> > >
> > >
> >
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> >
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