_lwt_FaceByEdges()

static LWGEOM * _lwt_FaceByEdges ( LWT_TOPOLOGY *  topo, LWT_ISO_EDGE *  edges, int  numfaceedges  )

static

Definition at line 2794 of file lwgeom_topo.c.

{
  LWGEOM *outg;
  LWCOLLECTION *bounds;
  LWGEOM **geoms = lwalloc( sizeof(LWGEOM*) * numfaceedges );
  int i, validedges = 0;
 
  for ( i=0; i<numfaceedges; ++i )
  {
    /* NOTE: skipping edges with same face on both sides, although
     *       correct, results in a failure to build faces from
     *       invalid topologies as expected by legacy tests.
     * TODO: update legacy tests expectances/unleash this skipping ?
     */
    /* if ( edges[i].face_left == edges[i].face_right ) continue; */
    geoms[validedges++] = lwline_as_lwgeom(edges[i].geom);
  }
  if ( ! validedges )
  {
    /* Face has no valid boundary edges, we'll return EMPTY, see
     * https://trac.osgeo.org/postgis/ticket/3221 */
    if ( numfaceedges ) lwfree(geoms);
    LWDEBUG(1, "_lwt_FaceByEdges returning empty polygon");
    return lwpoly_as_lwgeom(
            lwpoly_construct_empty(topo->srid, topo->hasZ, 0)
           );
  }
  bounds = lwcollection_construct(MULTILINETYPE,
                                  topo->srid,
                                  NULL, /* gbox */
                                  validedges,
                                  geoms);
  outg = lwgeom_buildarea( lwcollection_as_lwgeom(bounds) );
  lwcollection_release(bounds);
  lwfree(geoms);
#if 0
  {
  size_t sz;
  char *wkt = lwgeom_to_wkt(outg, WKT_EXTENDED, 2, &sz);
  LWDEBUGF(1, "_lwt_FaceByEdges returning area: %s", wkt);
  lwfree(wkt);
  }
#endif
  return outg;
}

References LWT_TOPOLOGY_T::hasZ, lwalloc(), lwcollection_as_lwgeom(), lwcollection_construct(), lwcollection_release(), LWDEBUG, LWDEBUGF, lwfree(), lwgeom_buildarea(), lwgeom_to_wkt(), lwline_as_lwgeom(), lwpoly_as_lwgeom(), lwpoly_construct_empty(), MULTILINETYPE, LWT_TOPOLOGY_T::srid, and WKT_EXTENDED.

Referenced by lwt_GetFaceEdges(), and lwt_GetFaceGeometry().

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