lwgeom_to_wkt()

char* lwgeom_to_wkt	(	const LWGEOM *	geom,
		uint8_t	variant,
		int	precision,
		size_t *	size_out
	)

WKT emitter function.

Parameters

lwgeom	geometry to convert to WKT
variant	output format to use (WKT_ISO, WKT_SFSQL, WKT_EXTENDED)

Allocates a new *char and fills it with the WKT representation. If size_out is not NULL, it will be set to the size of the allocated *char.

Parameters

variant	Bitmasked value, accepts one of WKT_ISO, WKT_SFSQL, WKT_EXTENDED.
precision	Number of significant digits in the output doubles.
size_out	If supplied, will return the size of the returned string, including the null terminator.

Definition at line 669 of file lwout_wkt.c.

References lwerror(), lwgeom_has_srid(), lwgeom_to_wkt_sb(), LWGEOM::srid, stringbuffer_aprintf(), stringbuffer_create(), stringbuffer_destroy(), stringbuffer_getlength(), stringbuffer_getstring(), stringbuffer_getstringcopy(), and WKT_EXTENDED.

Referenced by _lwt_EdgeSplit(), _lwt_FaceByEdges(), _lwt_FindNextRingEdge(), cu_wkt(), cu_wkt_in(), do_encoded_polyline_test(), do_geojson_test(), do_lwgeom_flip_coordinates(), errorIfGeometryCollection(), GenerateLineStringGeometry(), GeneratePointGeometry(), GeneratePolygonGeometry(), gserialized_to_string(), LWGEOM_asEWKT(), LWGEOM_asText(), lwgeom_to_ewkt(), lwgeom_to_text(), lwt_AddLine(), lwt_AddPoint(), lwt_ChangeEdgeGeom(), lwt_GetFaceEdges(), rt_raster_gdal_polygonize(), rt_raster_surface(), test_lwcurve_linearize(), test_lwgeom_locate_along(), test_misc_wkb(), test_ptarray_unstroke(), and triangle_parse().

{
        stringbuffer_t *sb;
        char *str = NULL;
        if ( geom == NULL )
                return NULL;
        sb = stringbuffer_create();
        /* Extended mode starts with an "SRID=" section for geoms that have one */
        if ( (variant & WKT_EXTENDED) && lwgeom_has_srid(geom) )
        {
                stringbuffer_aprintf(sb, "SRID=%d;", geom->srid);
        }
        lwgeom_to_wkt_sb(geom, sb, precision, variant);
        if ( stringbuffer_getstring(sb) == NULL )
        {
                lwerror("Uh oh");
                return NULL;
        }
        str = stringbuffer_getstringcopy(sb);
        if ( size_out )
                *size_out = stringbuffer_getlength(sb) + 1;
        stringbuffer_destroy(sb);
        return str;
}

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