point_from_geohash()

Datum point_from_geohash

(

PG_FUNCTION_ARGS

)

Definition at line 103 of file lwgeom_in_geohash.c.

References geometry_serialize(), lwfree(), lwpoint_make2d(), parse_geohash(), precision, SRID_UNKNOWN, text2cstring(), GBOX::xmax, GBOX::xmin, GBOX::ymax, and GBOX::ymin.

Referenced by box2d_from_geohash().

{
        GBOX *box = NULL;
        LWPOINT *point = NULL;
        GSERIALIZED *result = NULL;
        text *geohash_input = NULL;
        char *geohash = NULL;
        double lon, lat;
        int precision = -1;

        if (PG_ARGISNULL(0))
        {
                PG_RETURN_NULL();
        }

        if (!PG_ARGISNULL(1))
        {
                precision = PG_GETARG_INT32(1);
        }

        geohash_input = PG_GETARG_TEXT_P(0);
        geohash = text2cstring(geohash_input);

        box = parse_geohash(geohash, precision);

        lon = box->xmin + (box->xmax - box->xmin) / 2;
        lat = box->ymin + (box->ymax - box->ymin) / 2;

        point = lwpoint_make2d(SRID_UNKNOWN, lon, lat);
        result = geometry_serialize((LWGEOM *) point);

        lwfree(box);

        PG_RETURN_POINTER(result);
}

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