[geos-devel] OverlayNG for Testing

[Paul Ramsey]

So, with the last two commits

https://github.com/libgeos/geos/commit/aaafcce2
https://github.com/pramsey/geos/commit/8e340a77322445669bbffc5d6b9bf4d01b676a5a

We (haha, mostly Martin) have restored the old Linstring.Union() behaviour
(node-to-node lines extracted from graph) and the old
Geometry.Intersection() behaviour (all dimensional components extracted
from graph into GeometryCollection).

This should substantially reduce the number of regression issues when
building with the NG overlay turned on. As before I haven't actually tested
this myself yet, it's the end of the day, but I have high hopes.

We still have the known regression that Z values aren't going to be
added/preserved in 2d/3d and 3d/3d overlays.

Thank you Andrew Bell for the fixes to master to pass MSVC builds now too.

Next week, continued testing on regressions from me. Martin is away.

P.


On Thu, Aug 6, 2020 at 1:47 PM Paul Ramsey <pramsey at cleverelephant.ca>
wrote:

> Here's a spreadsheet...
>
>
> https://docs.google.com/spreadsheets/d/15Jk5cNuYdxPPA9fXIxCreRJNlkQZjc2KdYaX-odW8So/edit#gid=936876052
>
> It's probably not complete, but it's got the big entries...
>
> > On Aug 6, 2020, at 1:08 PM, Sandro Santilli <strk at kbt.io> wrote:
> >
> > On Thu, Jul 30, 2020 at 06:04:11PM -0700, Paul Ramsey wrote:
> >
> >> On a similar note, Martin has recovered the old behaviour for
> linstrings in overlays so we should be able to be back-compatible there
> too. As with the collections, there's an existing mechanism to get "nicer"
> behaviour already, the ST_Linemerge function.
> >>
> >> My hope is that, if we do these pieces to get old semantics, we will
> just be left with adding in the Z handling and be very very close to
> original semantics, enough so that we can stamp it 3.9 instead of 4.0. I
> love backwards compatibility on principle.
> >
> > Do you have an updated list of tasks to complete to get backward
> > compatibility in place ? I probably have the possibility to work
> > on some of them.
> >
> > --strk;
> > _______________________________________________
> > geos-devel mailing list
> > geos-devel at lists.osgeo.org
> > https://lists.osgeo.org/mailman/listinfo/geos-devel
>
>
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