Changes between Version 3 and Version 4 of DevWikiPostGISCoding

Timestamp:

Dec 9, 2010, 8:54:03 AM (13 years ago)

Author:

pramsey

Comment:

—

DevWikiPostGISCoding

@@ -55 +55 @@
 {
        PG_LWGEOM *result;
+       LWGEOM *theline;
+
        /* Detoast the actual PgSQL varlena structures, in our case PG_LWGEOM (soon to be GSERIALIZED) */
        PG_LWGEOM *geom1 = (PG_LWGEOM*)PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
        PG_LWGEOM *geom2 = (PG_LWGEOM*)PG_DETOAST_DATUM(PG_GETARG_DATUM(1));
+
        /* Build LWGEOM from the varlena (soon to be with lwgeom_from_gserialized) */
        LWGEOM *lwgeom1 = pglwgeom_deserialize(geom1);
        LWGEOM *lwgeom2 = pglwgeom_deserialize(geom2);
-       LWGEOM *theline;
 
-
+       /* SRID consistency test */
        if (lwgeom1->srid != lwgeom2->srid)
        {
@@ -70 +72 @@
        }
 
+       /* Calculate the shortest line, returned as an LWGEOM */
        theline = lw_dist2d_distanceline(lwgeom1, lwgeom2, lwgeom1->srid, DIST_MIN);
        if (lwgeom_is_empty(theline))
@@ -76 +79 @@
        /* Serialize the result back down from LWGEOM, but don't return right away */
        result = pglwgeom_serialize(theline);
+
        /* First free the LWGEOMs you used */
        lwgeom_free(lwgeom1);