ring_make_geos_friendly()

POINTARRAY * ring_make_geos_friendly

(

POINTARRAY *

ring

)

Definition at line 195 of file liblwgeom/lwgeom_geos_clean.c.

References POINTARRAY::flags, FLAGS_NDIMS, getPoint_internal(), LWDEBUGF, POINTARRAY::npoints, ptarray_addPoint(), ptarray_close2d(), and ptarray_free().

Referenced by LWGEOM_GEOS_getPointN(), and lwpoly_make_geos_friendly().

{
        POINTARRAY* closedring;
        POINTARRAY* ring_in = ring;

        /* close the ring if not already closed (2d only) */
        closedring = ptarray_close2d(ring);
        if (closedring != ring )
        {
                ring = closedring;
        }

        /* return 0 for collapsed ring (after closeup) */

        while ( ring->npoints < 4 )
        {
                POINTARRAY *oring = ring;
                LWDEBUGF(4, "ring has %d points, adding another", ring->npoints);
                /* let's add another... */
                ring = ptarray_addPoint(ring,
                                        getPoint_internal(ring, 0),
                                        FLAGS_NDIMS(ring->flags),
                                        ring->npoints);
                if ( oring != ring_in ) ptarray_free(oring);
        }


        return ring;
}

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