/** * 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). */ LWGEOM* wkt_parser_circularstring_new(POINTARRAY *pa, char *dimensionality) { 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)); }
LWGEOM * lwgeom_construct_empty(uint8_t type, int srid, char hasz, char hasm) { switch(type) { case POINTTYPE: return lwpoint_as_lwgeom(lwpoint_construct_empty(srid, hasz, hasm)); case LINETYPE: return lwline_as_lwgeom(lwline_construct_empty(srid, hasz, hasm)); case POLYGONTYPE: return lwpoly_as_lwgeom(lwpoly_construct_empty(srid, hasz, hasm)); case CURVEPOLYTYPE: return lwcurvepoly_as_lwgeom(lwcurvepoly_construct_empty(srid, hasz, hasm)); case CIRCSTRINGTYPE: return lwcircstring_as_lwgeom(lwcircstring_construct_empty(srid, hasz, hasm)); case TRIANGLETYPE: return lwtriangle_as_lwgeom(lwtriangle_construct_empty(srid, hasz, hasm)); case COMPOUNDTYPE: case MULTIPOINTTYPE: case MULTILINETYPE: case MULTIPOLYGONTYPE: case COLLECTIONTYPE: return lwcollection_as_lwgeom(lwcollection_construct_empty(type, srid, hasz, hasm)); default: lwerror("lwgeom_construct_empty: unsupported geometry type: %s", lwtype_name(type)); return NULL; } }
static LWGEOM* circstring_from_pa(const POINTARRAY *pa, int srid, int start, int end) { POINT4D p0, p1, p2; POINTARRAY *pao = ptarray_construct(ptarray_has_z(pa), ptarray_has_m(pa), 3); LWDEBUGF(4, "srid=%d, start=%d, end=%d", srid, start, end); getPoint4d_p(pa, start, &p0); ptarray_set_point4d(pao, 0, &p0); getPoint4d_p(pa, (start+end)/2, &p1); ptarray_set_point4d(pao, 1, &p1); getPoint4d_p(pa, end+1, &p2); ptarray_set_point4d(pao, 2, &p2); return lwcircstring_as_lwgeom(lwcircstring_construct(srid, NULL, pao)); }
void lwcircstring_release(LWCIRCSTRING *lwcirc) { lwgeom_release(lwcircstring_as_lwgeom(lwcirc)); }