LWGEOM_asGeoJson()

Datum LWGEOM_asGeoJson

(

PG_FUNCTION_ARGS

)

Definition at line 374 of file lwgeom_export.c.

{
        GSERIALIZED *geom;
        LWGEOM *lwgeom;
        char *geojson;
        text *result;
        int precision = DBL_DIG;
        int output_bbox = LW_FALSE;
        int output_long_crs = LW_FALSE;
        int output_short_crs = LW_FALSE;
        int output_guess_short_srid = LW_FALSE;
        char *srs = NULL;
        int32_t srid;
 
        /* Get the geometry */
        if (PG_ARGISNULL(0))
                PG_RETURN_NULL();
 
        geom = PG_GETARG_GSERIALIZED_P(0);
        srid = gserialized_get_srid(geom);
 
        /* Retrieve precision if any (default is max) */
        if ( PG_NARGS() > 1 && !PG_ARGISNULL(1) )
        {
                precision = PG_GETARG_INT32(1);
                if ( precision > DBL_DIG )
                        precision = DBL_DIG;
                else if ( precision < 0 )
                        precision = 0;
        }
 
        /* Retrieve output option
         * 0 = without option
         * 1 = bbox
         * 2 = short crs
         * 4 = long crs
         * 8 = guess if CRS is needed (default)
         */
        if (PG_NARGS() > 2 && !PG_ARGISNULL(2))
        {
                int option = PG_GETARG_INT32(2);
                output_guess_short_srid = (option & 8) ? LW_TRUE : LW_FALSE;
                output_short_crs = (option & 2) ? LW_TRUE : LW_FALSE;
                output_long_crs = (option & 4) ? LW_TRUE : LW_FALSE;
                output_bbox = (option & 1) ? LW_TRUE : LW_FALSE;
        }
        else
                output_guess_short_srid = LW_TRUE;
 
        if (output_guess_short_srid && srid != WGS84_SRID && srid != SRID_UNKNOWN)
                output_short_crs = LW_TRUE;
 
        if (srid != SRID_UNKNOWN && (output_short_crs || output_long_crs))
        {
                srs = getSRSbySRID(fcinfo, srid, !output_long_crs);
 
                if (!srs)
                {
                        elog(ERROR, "SRID %i unknown in spatial_ref_sys table", srid);
                        PG_RETURN_NULL();
                }
        }
 
        lwgeom = lwgeom_from_gserialized(geom);
        geojson = lwgeom_to_geojson(lwgeom, srs, precision, output_bbox);
        lwgeom_free(lwgeom);
 
        if (srs) pfree(srs);
 
        result = cstring_to_text(geojson);
        lwfree(geojson);
 
        PG_FREE_IF_COPY(geom, 0);
        PG_RETURN_TEXT_P(result);
}

References getSRSbySRID(), gserialized_get_srid(), LW_FALSE, LW_TRUE, lwfree(), lwgeom_free(), lwgeom_from_gserialized(), lwgeom_to_geojson(), precision, SRID_UNKNOWN, and WGS84_SRID.

Referenced by composite_to_geojson(), and LWGEOM_asGeoJson_old().

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