wkt_parser_circularstring_new()

LWGEOM* wkt_parser_circularstring_new	(	POINTARRAY *	pa,
		char *	dimensionality
	)

Create a new circularstring.

Null point array implies empty. Null dimensionality implies no specified dimensionality in the WKT. Circular strings are just like linestrings, except with slighty different validity rules (minpoint == 3, numpoints % 2 == 1).

Definition at line 388 of file lwin_wkt.c.

{
        uint8_t flags = wkt_dimensionality(dimensionality);
        LWDEBUG(4,"entered");
 
        /* No pointarray means it is empty */
        if( ! pa )
                return lwcircstring_as_lwgeom(lwcircstring_construct_empty(SRID_UNKNOWN, FLAGS_GET_Z(flags), FLAGS_GET_M(flags)));
 
        /* If the number of dimensions is not consistent, we have a problem. */
        if( wkt_pointarray_dimensionality(pa, flags) == LW_FALSE )
        {
                ptarray_free(pa);
                SET_PARSER_ERROR(PARSER_ERROR_MIXDIMS);
                return NULL;
        }
 
        /* Apply check for not enough points, if requested. */
        if( (global_parser_result.parser_check_flags & LW_PARSER_CHECK_MINPOINTS) && (pa->npoints < 3) )
        {
                ptarray_free(pa);
                SET_PARSER_ERROR(PARSER_ERROR_MOREPOINTS);
                return NULL;
        }
 
        /* Apply check for odd number of points, if requested. */
        if( (global_parser_result.parser_check_flags & LW_PARSER_CHECK_ODD) && ((pa->npoints % 2) == 0) )
        {
                ptarray_free(pa);
                SET_PARSER_ERROR(PARSER_ERROR_ODDPOINTS);
                return NULL;
        }
 
        return lwcircstring_as_lwgeom(lwcircstring_construct(SRID_UNKNOWN, NULL, pa));
}

References FLAGS_GET_M, FLAGS_GET_Z, global_parser_result, LW_FALSE, LW_PARSER_CHECK_MINPOINTS, LW_PARSER_CHECK_ODD, lwcircstring_as_lwgeom(), lwcircstring_construct(), lwcircstring_construct_empty(), LWDEBUG, POINTARRAY::npoints, struct_lwgeom_parser_result::parser_check_flags, PARSER_ERROR_MIXDIMS, PARSER_ERROR_MOREPOINTS, PARSER_ERROR_ODDPOINTS, ptarray_free(), SET_PARSER_ERROR, SRID_UNKNOWN, wkt_dimensionality(), and wkt_pointarray_dimensionality().

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