lwgeom_to_geojson()

lwvarlena_t * lwgeom_to_geojson ( const LWGEOM *  geo, const char *  srs, int  precision, int  has_bbox  )

extern

Takes a GEOMETRY and returns a GeoJson representation.

Definition at line 378 of file lwout_geojson.c.

{
        GBOX static_bbox = {0};
        geojson_opts opts;
        stringbuffer_t sb;
 
        memset(&opts, 0, sizeof(opts));
        opts.precision = precision;
        opts.hasz = FLAGS_GET_Z(geom->flags);
        opts.srs = srs;
 
        if (has_bbox)
        {
                /* Whether these are geography or geometry,
                   the GeoJSON expects a cartesian bounding box */
                lwgeom_calculate_gbox_cartesian(geom, &static_bbox);
                opts.bbox = &static_bbox;
        }
 
        /* To avoid taking a copy of the output, we make */
        /* space for the VARLENA header before starting to */
        /* serialize the geom */
        stringbuffer_init_varlena(&sb);
        /* Now serialize the geometry */
        asgeojson_geometry(&sb, geom, &opts);
        /* Leave the initially allocated buffer in place */
        /* and write the varlena_t metadata into the slot we */
        /* left at the start */
        return stringbuffer_getvarlena(&sb);
}

References asgeojson_geometry(), LWGEOM::flags, FLAGS_GET_Z, lwgeom_calculate_gbox_cartesian(), precision, stringbuffer_getvarlena(), and stringbuffer_init_varlena().

Referenced by do_geojson_test(), do_geojson_unsupported(), geography_as_geojson(), geometry_to_json(), geometry_to_jsonb(), and LWGEOM_asGeoJson().

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