lwpoly_clip_to_ordinate_range()

static LWCOLLECTION * lwpoly_clip_to_ordinate_range ( const LWPOLY *  poly, char  ordinate, double  from, double  to  )

inlinestatic

Clip an input LWPOLY between two values, on any ordinate input.

Definition at line 715 of file lwlinearreferencing.c.

{
        assert(poly);
        char hasz = FLAGS_GET_Z(poly->flags), hasm = FLAGS_GET_M(poly->flags);
        LWPOLY *poly_res = lwpoly_construct_empty(poly->srid, hasz, hasm);
        LWCOLLECTION *lwgeom_out = lwcollection_construct_empty(MULTIPOLYGONTYPE, poly->srid, hasz, hasm);
 
        for (uint32_t i = 0; i < poly->nrings; i++)
        {
                /* Ret number of points */
                POINTARRAY *pa = ptarray_clamp_to_ordinate_range(poly->rings[i], ordinate, from, to, LW_TRUE);
 
                if (!pa)
                        return NULL;
 
                if (pa->npoints >= 4)
                        lwpoly_add_ring(poly_res, pa);
                else
                {
                        ptarray_free(pa);
                        if (i == 0)
                                break;
                }
        }
        if (poly_res->nrings > 0)
                lwgeom_out = lwcollection_add_lwgeom(lwgeom_out, (LWGEOM *)poly_res);
        else
                lwpoly_free(poly_res);
 
        return lwgeom_out;
}

References LWPOLY::flags, FLAGS_GET_M, FLAGS_GET_Z, LW_TRUE, lwcollection_add_lwgeom(), lwcollection_construct_empty(), lwpoly_add_ring(), lwpoly_construct_empty(), lwpoly_free(), MULTIPOLYGONTYPE, POINTARRAY::npoints, LWPOLY::nrings, ptarray_clamp_to_ordinate_range(), ptarray_free(), LWPOLY::rings, and LWPOLY::srid.

Referenced by lwgeom_clip_to_ordinate_range().

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