lwpoly_from_lwlines()

LWPOLY * lwpoly_from_lwlines ( const LWLINE *  shell, uint32_t  nholes, const LWLINE **  holes  )

extern

Definition at line 359 of file lwpoly.c.

{
        uint32_t nrings;
        POINTARRAY **rings = lwalloc((nholes+1)*sizeof(POINTARRAY *));
        int32_t srid = shell->srid;
        LWPOLY *ret;
 
        if ( shell->points->npoints < 4 )
                lwerror("lwpoly_from_lwlines: shell must have at least 4 points");
        if ( ! ptarray_is_closed_2d(shell->points) )
                lwerror("lwpoly_from_lwlines: shell must be closed");
        rings[0] = ptarray_clone_deep(shell->points);
 
        for (nrings=1; nrings<=nholes; nrings++)
        {
                const LWLINE *hole = holes[nrings-1];
 
                if ( hole->srid != srid )
                        lwerror("lwpoly_from_lwlines: mixed SRIDs in input lines");
 
                if ( hole->points->npoints < 4 )
                        lwerror("lwpoly_from_lwlines: holes must have at least 4 points");
                if ( ! ptarray_is_closed_2d(hole->points) )
                        lwerror("lwpoly_from_lwlines: holes must be closed");
 
                rings[nrings] = ptarray_clone_deep(hole->points);
        }
 
        ret = lwpoly_construct(srid, NULL, nrings, rings);
        return ret;
}

References lwalloc(), lwerror(), lwpoly_construct(), POINTARRAY::npoints, LWLINE::points, ptarray_clone_deep(), ptarray_is_closed_2d(), and LWLINE::srid.

Referenced by _lwt_SnapEdge_checkMotion(), lwgeom_force_sfs(), and LWGEOM_makepoly().

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