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.

References twkb_parse_state::check, getPoint4d_p(), twkb_parse_state::has_m, twkb_parse_state::has_z, twkb_parse_state::is_empty, LW_FAILURE, LW_FALSE, LW_PARSER_CHECK_MINPOINTS, LWDEBUG, LWDEBUGF, lwerror(), lwpoly_add_ring(), lwpoly_construct_empty(), twkb_parse_state::lwtype, lwtype_name(), POINTARRAY::npoints, ptarray_append_point(), ptarray_from_twkb_state(), ptarray_is_closed_2d(), SRID_UNKNOWN, and twkb_parse_state_uvarint().

Referenced by lwgeom_from_twkb_state(), and lwmultipoly_from_twkb_state().

{
        uint32_t nrings;
        int 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;
}

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