lwpoly_from_twkb_state()

static LWPOLY * lwpoly_from_twkb_state ( twkb_parse_state *  s )

static

POLYGON.

Definition at line 272 of file lwin_twkb.c.

{
        uint32_t nrings;
        uint32_t i;
        LWPOLY *poly;
 
        LWDEBUG(2,"Entering lwpoly_from_twkb_state");
 
        if ( s->is_empty )
                return lwpoly_construct_empty(SRID_UNKNOWN, s->has_z, s->has_m);
 
        /* Read number of rings */
        nrings = twkb_parse_state_uvarint(s);
 
        /* Start w/ empty polygon */
        poly = lwpoly_construct_empty(SRID_UNKNOWN, s->has_z, s->has_m);
 
        LWDEBUGF(4,"Polygon has %d rings", nrings);
 
        /* Empty polygon? */
        if( nrings == 0 )
                return poly;
 
        for( i = 0; i < nrings; i++ )
        {
                /* Ret number of points */
                uint32_t npoints = twkb_parse_state_uvarint(s);
                POINTARRAY *pa = ptarray_from_twkb_state(s, npoints);
 
                /* Skip empty rings */
                if( pa == NULL )
                        continue;
 
                /* Force first and last points to be the same. */
                if( ! ptarray_is_closed_2d(pa) )
                {
                        POINT4D pt;
                        getPoint4d_p(pa, 0, &pt);
                        ptarray_append_point(pa, &pt, LW_FALSE);
                }
 
                /* Check for at least four points. */
                if( s->check & LW_PARSER_CHECK_MINPOINTS && pa->npoints < 4 )
                {
                        LWDEBUGF(2, "%s must have at least four points in each ring", lwtype_name(s->lwtype));
                        lwerror("%s must have at least four points in each ring", lwtype_name(s->lwtype));
                        return NULL;
                }
 
                /* Add ring to polygon */
                if ( lwpoly_add_ring(poly, pa) == LW_FAILURE )
                {
                        LWDEBUG(2, "Unable to add ring to polygon");
                        lwerror("Unable to add ring to polygon");
                }
 
        }
        return poly;
}

References getPoint4d_p(), LW_FAILURE, LW_FALSE, LW_PARSER_CHECK_MINPOINTS, LWDEBUG, LWDEBUGF, lwerror(), lwpoly_add_ring(), lwpoly_construct_empty(), lwtype_name(), POINTARRAY::npoints, ptarray_append_point(), ptarray_from_twkb_state(), ptarray_is_closed_2d(), s, SRID_UNKNOWN, and twkb_parse_state_uvarint().

Referenced by lwgeom_from_twkb_state(), and lwmultipoly_from_twkb_state().

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