[geos-devel] Single-sided buffer gives unexpected result

[Paul Meems]

I've submitted ticket #712: http://trac.osgeo.org/geos/ticket/712

Thanks,

Paul

*Paul Meems *
Release manager, configuration manager
and forum moderator of MapWindow GIS.
www.mapwindow.org

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Dutch speaking users.
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2014-11-24 10:19 GMT+01:00 Sandro Santilli <strk at keybit.net>:

> On Thu, Nov 13, 2014 at 01:48:35PM +0100, Paul Meems wrote:
> > I have this linestring:
> > LINESTRING(6.59607872405104612 53.00390260763848715, 6.5970405434596513
> > 53.00362892273712845, 6.59798287063396227 53.00336078433459619,
> > 6.59864650169724065 53.00303357725661613, 6.59938686388177764
> > 53.00283982209050748, 6.60119220843164101 53.00211012469529948,
> > 6.60112679624460608 53.00208460961093948, 6.60026057476097616
> > 53.00174672587350244, 6.58878962886061181 52.99727229739764311)
> >
> > I create a single-sided buffer of -9E-10 (-70m) with flat endcaps and
> round
> > joinstyle.
> > This should create a polygon left of the line.
> > But it creates a buffer as in the attached image. You can see that in the
> > right corner the polygon is also at the right of the line. This happens
> > only at sharp corners.
> > Am I forgetting a setting or something?
>
> It sounds like a bug to me. Would be useful to check the same input
> against JTS to see if the bug is there or in the port. In any case
> the first step would be to file a ticket. NOTE: chances are a similar
> ticket already exists so please add your case to the existing one if so.
>
> --strk;
>
>  ()  ASCII ribbon campaign  --  Keep it simple !
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