OK, it was a bit harder than you interpreted (takes more than a SQL
cut'n'paste) and not as straightforward as I thought it might be (the
simplify function that was already there was a native implementation,
not a GEOS call, so cutting and pasting it would do no good).
Anyhow, I have applied my incredible text editing skills and now there
is a ST_SimplifyPreserveTopology(geometry, float) in the -svn drop.
Paul
On Feb 8, 2008, at 10:21 PM, Brian Hamlin wrote:
It recently came up in the IRC channel FreeNode #postgis
that there is a GEOS TopologyPreserveSimplify, in addition
to Simplify2D.
I did a bit of checking just now.. on my machine, I see
nm /usr/local/pgsql/lib/liblwgeom.1.3.so
_LWGEOM_simplify2d
_pg_finfo_LWGEOM_simplify2d
_simplify2d_lwgeom
and some others, but no TopologyPreserve anything
nm /usr/lcoal/lib/libgeos_c.1.4.1.dylib
_GEOSSimplify
_GEOSTopologyPreserveSimplify
and lastly, in lwpostgis.sql
CREATE OR REPLACE FUNCTION simplify(geometry, float8)
RETURNS geometry
AS '$libdir/liblwgeom', 'LWGEOM_simplify2d'
LANGUAGE 'C' IMMUTABLE STRICT;
--
since the last SQL line matches the exported symbol name from
liblwgeom
exactly, minus the front _, looks like there is the exact entry point.
Clearly no parallel entry for TopologyPreseveSimplify
this makes me think that there is a little more to adding the call to
lwpostgis.sql than copying and pasting the declaration.
insights welcome
-Brian
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